WO2008003819A1 - Tyre cutting device, method for cutting the side wall of a tyre and use of a cutting device - Google Patents

Tyre cutting device, method for cutting the side wall of a tyre and use of a cutting device Download PDF

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Publication number
WO2008003819A1
WO2008003819A1 PCT/FI2007/000187 FI2007000187W WO2008003819A1 WO 2008003819 A1 WO2008003819 A1 WO 2008003819A1 FI 2007000187 W FI2007000187 W FI 2007000187W WO 2008003819 A1 WO2008003819 A1 WO 2008003819A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutting
tyre
blade
counterpart
side wall
Prior art date
Application number
PCT/FI2007/000187
Other languages
French (fr)
Inventor
Aapo Aarrekorpi
Pekka Turunen
Original Assignee
Fortecta Finland Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fortecta Finland Ltd filed Critical Fortecta Finland Ltd
Publication of WO2008003819A1 publication Critical patent/WO2008003819A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
    • B26D1/14—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter
    • B26D1/20—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter coacting with a fixed member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/003—Cutting work characterised by the nature of the cut made; Apparatus therefor specially adapted for cutting rubber
    • B26D3/005—Cutting work characterised by the nature of the cut made; Apparatus therefor specially adapted for cutting rubber for cutting used tyres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D9/00—Cutting apparatus combined with punching or perforating apparatus or with dissimilar cutting apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/24—Perforating by needles or pins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2030/00—Pneumatic or solid tyres or parts thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • the invention relates to a tyre cutting device, method for cutting side wall of a tyre and use of a cutting device according to the preambles of the independent claims presented below.
  • Used tyres can be used for example as a fuel in industrial furnaces or combustion boilers, as filling material in excavating or they can be made to rubber mats for example to be used as a blast shelter.
  • whole tyres must be cut into smaller parts before utilization.
  • whole tyres burn too slowly and in excavating empty space is easily left inside whole tyres, in which case compactness and solidness suffer.
  • the side walls of a tyre must be cut off from the tyre, from which a tyre tread then remains in addition to the side walls.
  • Patent publication FR 2764227 discloses a device for cutting especially big tyres.
  • the device comprises a jagged knifelike blade, which can be moved in relation to the tyre so that for example the side wall of the tyre can be cut off.
  • the function is based on the slitting knifelike cutting force.
  • the problem is that due to softness and flexibility of the material to be cut, a cutting performed by slitting requires a remarkably great counter force or a rigid counter surface so that the cutting would succeed. It must be possible to support the tyre to be cut well especially near the blade and the cutting point.
  • Patent publication WO 02/076692 A1 discloses a device for removing the side wall of a tyre. It comprises a support frame, rolls for rotating the tyre and a discoidal motor-operated cutting blade and a freely rotating counter blade.
  • the problem of the motor-operated cutting blade is usually the noise caused by it and sometimes also the inaccurate cutting trace.
  • Patent publication GB 127,970 discloses a tyre cutting device, which comprises a blade unit, which has a cutting blade, and a counterpart as well as means for rotating the tyre in relation to the blade unit.
  • Cutting by a toothed blade is based on the fact that the teeth of the rotating blade wear the material off from the object to be cut by sawing, so that an opening, the size of which approximately corresponds to the width of the blade, is formed.
  • the problem of this way of cutting is that rubber dust and powder as well as pieces of metallic reinforcement wires and metal dust come off from the tyre.
  • the sawing manner of cutting also causes remarkable noise and tears off, in addition to the rubber material to be cut, also the metallic reinforcement wires so that the cut surface becomes rough and typically sharp projecting ends of the metallic wires remain in it.
  • the tyre cutting device, method for cutting the side wall of a tyre as well as use of a cutting device according to the invention are characterized by what is presented in the characterizing parts of the appended independent claims.
  • the embodiments and advantages mentioned in this text relate, when applicable, to the tyre cutting device, method for cutting a side wall of a tyre, as well as to the use of a cutting device according to the invention, even though it is not always specifically mentioned.
  • a typical tyre cutting device comprises
  • a cutting blade which is rotatable around its axis and arranged in connection with the frame via the axis, which cutting blade has a cutting edge
  • a counterpart of a typical cutting device according to the invention comprises a sharp tip part for arranging the counterpart at least partially through the side wall of the tyre.
  • the counterpart is arranged at least partially through the side wall of the tyre
  • the tyre to be cut is rotated in relation to the blade unit of the cutting device so that the side wall of the tyre pushes in between the cutting blade and the counterpart rotating the cutting blade, so that a shear force directed to the side wall of the tyre and cutting it is formed between cutting edges of the cutting blade and the counterpart.
  • the cutting device is according to the invention disclosed in this application.
  • the tyre as well as the car tyre refers generally to a tyre of a vehicle, such as a car, bus, truck, trailer truck, tractor or the like and especially to its rubber part, which often also comprises metallic reinforcement wires.
  • an opening can be arranged in the side wall of the tyre with the aid of a sharp tip part of the counterpart.
  • Said tip part can be simultaneously arranged at least partially through the side wall of the tyre.
  • the blade unit is in a fixed connection with the frame of the cutting device.
  • the blade unit can also be removably fixed to the frame or it can be a separate device arranged in connection with the frame of the cutting device.
  • the blade unit can also have a frame of its own, which frame can be formed, for example, by the base of the counterpart.
  • the frame of the blade unit can be a part of the frame of the cutting device or totally apart from it.
  • the cutting edge refers to such edge of the cutting blade and counterpart, the angle of which edge is typically 90° or smaller, for example 1 - 90°, 10 - 85°, 20 - 70°, 30 - 70° or 45 - 70°.
  • the angle of the cutting edge is rounded as little as possible.
  • the shear force refers to a substantially similar force, which is formed between the cutting blades of the scissors when cutting with the scissors.
  • the shear force is formed between the cutting edge of the cutting blade and the cutting edge of the counterpart.
  • the shear force divides the object to be cut into two parts without wearing off a remarkable amount of cutting waste from the object to be cut, as typically occurs, for example, when cutting by sawing.
  • the cross section of the cutting edge of the cutting blade is substantially circular in a direction of a plane perpendicular to the axis of rotation.
  • the cutting edge of the circular cutting blade is formed by a peripheral part of the blade, i.e. the outermost part in the direction of the radius of the blade.
  • the cutting edge is formed of very hard material for example of special steel or diamond.
  • the periphery of the blade can be purely circular form or it can have projections, for example rounded or sharp toothing pattern.
  • the counterpart of the cutting device is arrangeable in connection with the cutting blade stationarily in relation to the frame of the device.
  • the counterpart can be arranged in connection with the blade stationarily or removably or for example so that it is turned or moved in connection with the blade before cutting the tyre.
  • the counterpart is removably fixed in connection with the cutting blade by pushing it or arranging it in another way to a fixing element similar to a rail or booth, in which no bolts are needed for fixing.
  • the cutting blade is freely rotatable around its axis and the cutting device lacks means for rotating the cutting blade.
  • the cutting device has for example no motor or similar means, with which the cutting blade would be rotatable.
  • the object to be cut i.e. the tyre
  • the tyre is not considered to be a means for rotating the cutting blade, although the tyre is rotated so that it rotates the cutting blade.
  • the device can be provided with means, such as a motor, for rotating the cutting blade, but then the blade is rotated relatively slowly, preferably in the substantially same speed as the tyre to be cut, so that the cutting of the tyre is based on a shear force similar to the scissor force and not on cutting by sawing, which wears the material away.
  • the rotatable cutting blade can also act as a means for rotating the tyre.
  • the toothing or other design arranged in connection with the cutting edge strengthens then the friction needed for rotating the tyre.
  • the operation of the device is based on the shear force between the cutting blade and the counterpart.
  • the cutting device comprises two blade units.
  • the blade units are arranged so that both side walls of a tyre can be cut off simultaneously by rotating the tyre to be cut one revolution.
  • the cutting device comprises three or four blade units.
  • the means for rotating the tyre comprise a gripping element for gripping the tyre as well as means for rotating the gripping element.
  • the gripping elements can be manufactured having many different structures. The purpose of the gripping element is to grip the tyre firmly so that the tyre can be rotated in relation to the blade unit. Examples of the means for rotating the tyre and of the gripping means are disclosed i.a. in the prior art publications cited in this application.
  • Figure 1 shows a tyre cutting device according to the first embodiment of the invention
  • Figure 2 shows a blade unit of the cutting device similar to the example of
  • Figure 3 shows a blade unit of Figure 2 seen from a direction perpendicular to the axis of rotation of the cutting blade
  • Figure 4 shows a blade unit of Figure 3 when the whole unit has been turned from the situation of Figure 3
  • Figure 5 shows a perspective view of how the side wall of a car tyre is being cut with a cutting device according to an embodiment of the invention
  • Figure 6 shows how the side wall is being cut with a blade unit of the cutting device according to an embodiment of the invention
  • Figure 7 shows two blade units of the cutting device cutting the side walls of a tyre
  • Figure 8 shows a situation of Figure 7 seen from a direction perpendicular to the axes of rotation of the cutting blades.
  • Figure 1 shows a tyre cutting device according to the first embodiment of the invention.
  • the device comprises means for rotating the tyre 1 , which means in this example comprise gripping elements 18 for gripping the tyre.
  • the gripping elements 18 and thus also the tyre 1 can be rotated for example with the aid of an electric motor (not shown).
  • the cutting device of the example comprises two blade units 7, 7a for cutting simultaneously both side walls of the tyre.
  • the tip parts 15, 15a of the counterparts of the blade units are sharp and they have been partially arranged through the side wall of the tyre 1.
  • the tyre 1 is rotated in relation to the blade units 7, 7a of the cutting device, so that the side wall of the tyre pushes in between the cutting blade 8, 8a and the counterpart 14, 14a rotating the cutting blade so that a shear force directed to the side wall of the tyre and cutting it is formed between the cutting edges of the cutting blade and the counterpart.
  • Figure 2 shows a blade unit of the cutting device similar to the example of Figure 1 seen from the direction of the axis of rotation 10 of the cutting blade 8. It comprises a frame 11 , in connection with which a discoidal cutting blade 8 has been arranged via an axis 10 and a bearing, which cutting blade is rotatable around its axis 10.
  • the cross section of the cutting edge 9 of the cutting blade in a plane perpendicular to the axis is substantially circular.
  • the device according to the invention preferably lacks a power source, such as a motor, for rotating the blade 8.
  • the frame 11 of the blade unit shown in the figure forms in a preferred embodiment a part of the frame of the entire cutting device.
  • the frame of the blade unit can also be formed by a suitably designed base part of the counterpart.
  • the counterpart 14 has been arranged immovable in relation to the frame 11 , in this example it has been fixed to the frame by bolts 16.
  • the periphery of the circular cutting blade 8, i.e. the cutting edge 9, is partially arranged so that it overlaps the cutting edge 17 of the counterpart , in which case a cutting point 30 is formed to their intersection.
  • Figure 3 shows a blade unit of Figure 2 seen from a direction perpendicular to the axis of rotation 10 of the cutting blade 8.
  • the Figure shows a discoidal cutting blade 8, which is fixed via an axis 10 and a bearing 12 to the frame 11 so that the blade 8 is freely rotatable in relation to the frame and the counterpart 14.
  • the cutting edge 9 of the cutting blade has been arranged very close to the cutting edge 17 of the counterpart.
  • the cutting edges 9, 17 preferably touch each other, but for the sake of clarity they have been drawn slightly apart in the figure.
  • FIG 4 the blade unit of Figure 3 is shown so that the whole unit has been turned from the situation of Figure 3 clockwise 90 degrees around the axis of rotation 10 of the cutting blade seen from the direction of the arrow 31.
  • the cutting edge 9 of the cutting blade is in a very close, typically in a contact connection, with the cutting edge 17 of the counterpart.
  • the cutting edges of the scissor blades are typically in a similar connection with each other.
  • a shear force is formed between its cutting edge 9 and the cutting edge 17 of the counterpart 14, which shear force is similar to the shear force formed between the scissor blades.
  • the angle ⁇ of the cutting edge of the cutting blade is approximately 30° and the angle ⁇ of the cutting edge of the counterpart is approximately 65°.
  • Figure 5 shows a perspective view of how the side wall 2 of a car tyre 1 is being cut with a cutting device according to an embodiment of the invention.
  • the device also comprises the second blade unit as well as means for rotating the tyre.
  • the counterpart 14 has a sharp tip part 15 and with the aid of it the counterpart is partially arranged through the side wall 2 of the tyre inside the tyre so that the side wall of the tyre next 20 to the point of intersection is set between the cutting blade 8 and the counterpart 14.
  • Figure 6 shows from the direction perpendicular to the side wall 2 of the tyre, how the side wall is being cut with the blade unit of the cutting device according to an embodiment of the invention.
  • the counterpart 14 is partially arranged through the side wall 2 of the tyre inside the tyre so that the side wall of the tyre is set between the cutting blade 8 and the counterpart 14 next to the point of intersection.
  • the tyre is rotated to the direction of the arrow 34 so that the side wall 2 of the tyre pushes in between the cutting blade 8 and the counterpart 14, in which case the tyre also rotates the cutting blade 8 so that a shear force cutting the side wall of the tyre is formed between the cutting edges 9, 17 of the cutting blade and the counterpart, the cutting trace 5 caused by which shear force is seen in the side wall 2.
  • the radius of the tyre it can be chosen, in which point it is desired to cut the side wall 2 between points A and B, in which B is that part of the side wall, which is nearest the tyre tread 3.
  • FIG. 7 it is shown two blade units 7, 7a of the cutting device cutting the side walls 2, 2a of the tyre in the direction perpendicular to the tyre tread 3 and in the direction of the axes 10, 10a of the cutting blades.
  • Figure 8 shows a situation of Figure 7 seen from a direction perpendicular to the axes of rotation 10, 10a of the cutting blades.
  • the side walls 2, 2a of the tyre push in between 20, 20a the cutting edges of the cutting blade 8, 8a and the counterpart 14, 14a, to which a shear force directed to the side wall is formed when the tyre rotates the cutting blade.
  • Figures show advantageous embodiments of the invention.
  • the Figures do not separately show matters that are irrelevant in view of the main idea of the invention, known as such or obvious as such for a person skilled in the art. It is apparent that the invention is not limited exclusively to the examples described above, but that the invention can vary within the scope of the claims presented below.
  • the dependent claims present some possible embodiments of the invention, and they are not to be considered to restrict the scope of protection of the invention as such. Also the reference numbers are not to be considered to restrict the invention.

Abstract

The invention relates to a tyre cutting device comprising a frame and at least one blade unit (7, 7a) as well as means for rotating the tyre (1 ) in relation to the blade unit. The blade unit comprises a cutting blade (8, 8a), which is rotatable around its axis (10, 10a) and arranged in connection with the frame with the axis, which cutting blade has a cutting edge (9), and a counterpart (14, 14a), which comprises a cutting edge (17) and which has been arranged in connection with the cutting blade so that the side wall (2, 2a) of the tyre to be cut is arrangeable between the cutting blade and the counterpart. The cutting blade is rotatable in relation to the counterpart so that a shear force is formed between the cutting edge (9) of the cutting blade and the cutting edge (17) of the counterpart, and the counterpart (14, 14a) further comprises a sharp tip part (15, 15a) for arranging the counterpart at least partially through the side wall (2, 2a) of the tyre.

Description

TYRE CUTTING DEVICE, METHOD FOR CUTTING THE SIDE WALL OF A TYRE AND USE OF A CUTTING DEVICE
TECHNICAL FIELD OF THE INVENTION
The invention relates to a tyre cutting device, method for cutting side wall of a tyre and use of a cutting device according to the preambles of the independent claims presented below.
PRIOR ART
Lots of used car tyres are formed in the world and instead of ending up in waste it is aimed to recycle them for utilization. Used tyres can be used for example as a fuel in industrial furnaces or combustion boilers, as filling material in excavating or they can be made to rubber mats for example to be used as a blast shelter. In many cases whole tyres must be cut into smaller parts before utilization. For example in combustion furnaces whole tyres burn too slowly and in excavating empty space is easily left inside whole tyres, in which case compactness and solidness suffer. For certain uses, especially the side walls of a tyre must be cut off from the tyre, from which a tyre tread then remains in addition to the side walls.
Patent publication FR 2764227 discloses a device for cutting especially big tyres. The device comprises a jagged knifelike blade, which can be moved in relation to the tyre so that for example the side wall of the tyre can be cut off. The function is based on the slitting knifelike cutting force. The problem is that due to softness and flexibility of the material to be cut, a cutting performed by slitting requires a remarkably great counter force or a rigid counter surface so that the cutting would succeed. It must be possible to support the tyre to be cut well especially near the blade and the cutting point.
Patent publication WO 02/076692 A1 discloses a device for removing the side wall of a tyre. It comprises a support frame, rolls for rotating the tyre and a discoidal motor-operated cutting blade and a freely rotating counter blade. The problem of the motor-operated cutting blade is usually the noise caused by it and sometimes also the inaccurate cutting trace.
Patent publication GB 127,970 discloses a tyre cutting device, which comprises a blade unit, which has a cutting blade, and a counterpart as well as means for rotating the tyre in relation to the blade unit.
Cutting by a toothed blade, for example by a motor-operated circle saw, is based on the fact that the teeth of the rotating blade wear the material off from the object to be cut by sawing, so that an opening, the size of which approximately corresponds to the width of the blade, is formed. The problem of this way of cutting is that rubber dust and powder as well as pieces of metallic reinforcement wires and metal dust come off from the tyre. The sawing manner of cutting also causes remarkable noise and tears off, in addition to the rubber material to be cut, also the metallic reinforcement wires so that the cut surface becomes rough and typically sharp projecting ends of the metallic wires remain in it.
THE AIM AND BRIEF DESCRIPTION OF THE INVENTION
It is an aim of the present invention to reduce or even totally eliminate the above- mentioned problems appearing in the prior art.
It is an aim of the invention to remarkably reduce the noise and rubber and metal dust forming in the cutting of a tyre.
It is an aim of the invention to achieve a tyre cutting device, by using of which it is obtained an accurate and even cutting trace, so that no sharp projecting ends of the reinforcement wire remain in the cut surface.
To attain i.a. the above purposes, the tyre cutting device, method for cutting the side wall of a tyre as well as use of a cutting device according to the invention are characterized by what is presented in the characterizing parts of the appended independent claims. The embodiments and advantages mentioned in this text relate, when applicable, to the tyre cutting device, method for cutting a side wall of a tyre, as well as to the use of a cutting device according to the invention, even though it is not always specifically mentioned.
A typical tyre cutting device according to the invention comprises
- a frame
- at least one blade unit, which comprises
- a cutting blade, which is rotatable around its axis and arranged in connection with the frame via the axis, which cutting blade has a cutting edge, and
- a counterpart comprising a cutting edge and which counterpart has been arranged in connection with the cutting blade, so that the side wall of the tyre to be cut is arrangeable between the cutting blade and the counterpart, and
- means for rotating the tyre in relation to the blade unit, which said cutting blade is rotatable in relation to the counterpart, so that a shear force is formed between the cutting edge of the cutting blade and the cutting edge of the counterpart.
A counterpart of a typical cutting device according to the invention comprises a sharp tip part for arranging the counterpart at least partially through the side wall of the tyre.
In a typical method according to the invention for cutting the side wall of the tyre with the cutting device
- the counterpart is arranged at least partially through the side wall of the tyre, and
- the tyre to be cut is rotated in relation to the blade unit of the cutting device so that the side wall of the tyre pushes in between the cutting blade and the counterpart rotating the cutting blade, so that a shear force directed to the side wall of the tyre and cutting it is formed between cutting edges of the cutting blade and the counterpart. In a typical use of the cutting device according to the invention in cutting of tyres the cutting device is according to the invention disclosed in this application.
In this application the tyre as well as the car tyre refers generally to a tyre of a vehicle, such as a car, bus, truck, trailer truck, tractor or the like and especially to its rubber part, which often also comprises metallic reinforcement wires.
In a cutting device according to the invention an opening can be arranged in the side wall of the tyre with the aid of a sharp tip part of the counterpart. Said tip part can be simultaneously arranged at least partially through the side wall of the tyre.
According to an embodiment the blade unit is in a fixed connection with the frame of the cutting device. The blade unit can also be removably fixed to the frame or it can be a separate device arranged in connection with the frame of the cutting device. The blade unit can also have a frame of its own, which frame can be formed, for example, by the base of the counterpart. The frame of the blade unit can be a part of the frame of the cutting device or totally apart from it.
The cutting edge refers to such edge of the cutting blade and counterpart, the angle of which edge is typically 90° or smaller, for example 1 - 90°, 10 - 85°, 20 - 70°, 30 - 70° or 45 - 70°. Preferably, the angle of the cutting edge is rounded as little as possible.
The shear force refers to a substantially similar force, which is formed between the cutting blades of the scissors when cutting with the scissors. When using the cutting device of the invention the shear force is formed between the cutting edge of the cutting blade and the cutting edge of the counterpart. The shear force divides the object to be cut into two parts without wearing off a remarkable amount of cutting waste from the object to be cut, as typically occurs, for example, when cutting by sawing.
According to an embodiment of the invention the cross section of the cutting edge of the cutting blade is substantially circular in a direction of a plane perpendicular to the axis of rotation. The cutting edge of the circular cutting blade is formed by a peripheral part of the blade, i.e. the outermost part in the direction of the radius of the blade. According to an embodiment the cutting edge is formed of very hard material for example of special steel or diamond. The periphery of the blade can be purely circular form or it can have projections, for example rounded or sharp toothing pattern.
According to an embodiment of the invention the counterpart of the cutting device is arrangeable in connection with the cutting blade stationarily in relation to the frame of the device. The counterpart can be arranged in connection with the blade stationarily or removably or for example so that it is turned or moved in connection with the blade before cutting the tyre.
According to an embodiment of the invention the counterpart is removably fixed in connection with the cutting blade by pushing it or arranging it in another way to a fixing element similar to a rail or booth, in which no bolts are needed for fixing.
According to an embodiment of the invention the cutting blade is freely rotatable around its axis and the cutting device lacks means for rotating the cutting blade. According to this embodiment the cutting device has for example no motor or similar means, with which the cutting blade would be rotatable. In this case the object to be cut, i.e. the tyre, is not considered to be a means for rotating the cutting blade, although the tyre is rotated so that it rotates the cutting blade. In an embodiment the device can be provided with means, such as a motor, for rotating the cutting blade, but then the blade is rotated relatively slowly, preferably in the substantially same speed as the tyre to be cut, so that the cutting of the tyre is based on a shear force similar to the scissor force and not on cutting by sawing, which wears the material away. In that case, the rotatable cutting blade can also act as a means for rotating the tyre. The toothing or other design arranged in connection with the cutting edge strengthens then the friction needed for rotating the tyre. Also when using a toothed cutting edge the operation of the device is based on the shear force between the cutting blade and the counterpart. According to an embodiment of the invention the cutting device comprises two blade units. According to an especially preferred embodiment the blade units are arranged so that both side walls of a tyre can be cut off simultaneously by rotating the tyre to be cut one revolution. According to another embodiment the cutting device comprises three or four blade units.
According to an embodiment of the invention the means for rotating the tyre comprise a gripping element for gripping the tyre as well as means for rotating the gripping element. The gripping elements can be manufactured having many different structures. The purpose of the gripping element is to grip the tyre firmly so that the tyre can be rotated in relation to the blade unit. Examples of the means for rotating the tyre and of the gripping means are disclosed i.a. in the prior art publications cited in this application.
By means of the device and method according to the invention it is achieved a very accurate cutting trace, so that no sharp ends of metallic reinforcement wires protrude from the cut surface. When using the device and method of the invention the forming of noise, rubber and metal dust as well as other cutting waste can be remarkably reduced or even totally avoided.
BRIEF DESCRIPTION OF THE FIGURES
The invention is described in more detail below with reference to the enclosed schematic drawing, in which Figure 1 shows a tyre cutting device according to the first embodiment of the invention, Figure 2 shows a blade unit of the cutting device similar to the example of
Figure 1 ,
Figure 3 shows a blade unit of Figure 2 seen from a direction perpendicular to the axis of rotation of the cutting blade,
Figure 4 shows a blade unit of Figure 3 when the whole unit has been turned from the situation of Figure 3, Figure 5 shows a perspective view of how the side wall of a car tyre is being cut with a cutting device according to an embodiment of the invention, Figure 6 shows how the side wall is being cut with a blade unit of the cutting device according to an embodiment of the invention, Figure 7 shows two blade units of the cutting device cutting the side walls of a tyre, and Figure 8 shows a situation of Figure 7 seen from a direction perpendicular to the axes of rotation of the cutting blades.
DETAILED DESCRIPTION OF THE EXAMPLES OF THE FIGURES
Figure 1 shows a tyre cutting device according to the first embodiment of the invention. The device comprises means for rotating the tyre 1 , which means in this example comprise gripping elements 18 for gripping the tyre. The gripping elements 18 and thus also the tyre 1 can be rotated for example with the aid of an electric motor (not shown). The cutting device of the example comprises two blade units 7, 7a for cutting simultaneously both side walls of the tyre. The tip parts 15, 15a of the counterparts of the blade units are sharp and they have been partially arranged through the side wall of the tyre 1. The tyre 1 is rotated in relation to the blade units 7, 7a of the cutting device, so that the side wall of the tyre pushes in between the cutting blade 8, 8a and the counterpart 14, 14a rotating the cutting blade so that a shear force directed to the side wall of the tyre and cutting it is formed between the cutting edges of the cutting blade and the counterpart.
Figure 2 shows a blade unit of the cutting device similar to the example of Figure 1 seen from the direction of the axis of rotation 10 of the cutting blade 8. It comprises a frame 11 , in connection with which a discoidal cutting blade 8 has been arranged via an axis 10 and a bearing, which cutting blade is rotatable around its axis 10. The cross section of the cutting edge 9 of the cutting blade in a plane perpendicular to the axis is substantially circular. The device according to the invention preferably lacks a power source, such as a motor, for rotating the blade 8. The frame 11 of the blade unit shown in the figure forms in a preferred embodiment a part of the frame of the entire cutting device. The frame of the blade unit can also be formed by a suitably designed base part of the counterpart. The counterpart 14 has been arranged immovable in relation to the frame 11 , in this example it has been fixed to the frame by bolts 16. The periphery of the circular cutting blade 8, i.e. the cutting edge 9, is partially arranged so that it overlaps the cutting edge 17 of the counterpart , in which case a cutting point 30 is formed to their intersection.
Figure 3 shows a blade unit of Figure 2 seen from a direction perpendicular to the axis of rotation 10 of the cutting blade 8. The Figure shows a discoidal cutting blade 8, which is fixed via an axis 10 and a bearing 12 to the frame 11 so that the blade 8 is freely rotatable in relation to the frame and the counterpart 14. The cutting edge 9 of the cutting blade has been arranged very close to the cutting edge 17 of the counterpart. The cutting edges 9, 17 preferably touch each other, but for the sake of clarity they have been drawn slightly apart in the figure.
In Figure 4 the blade unit of Figure 3 is shown so that the whole unit has been turned from the situation of Figure 3 clockwise 90 degrees around the axis of rotation 10 of the cutting blade seen from the direction of the arrow 31. The cutting edge 9 of the cutting blade is in a very close, typically in a contact connection, with the cutting edge 17 of the counterpart. For example, the cutting edges of the scissor blades are typically in a similar connection with each other. When rotating the cutting blade 8 a shear force is formed between its cutting edge 9 and the cutting edge 17 of the counterpart 14, which shear force is similar to the shear force formed between the scissor blades. In this example, the angle α of the cutting edge of the cutting blade is approximately 30° and the angle β of the cutting edge of the counterpart is approximately 65°.
Figure 5 shows a perspective view of how the side wall 2 of a car tyre 1 is being cut with a cutting device according to an embodiment of the invention. In the example of the Figure it is shown only one blade unit 7 of the cutting device. According to a preferred embodiment the device also comprises the second blade unit as well as means for rotating the tyre. The counterpart 14 has a sharp tip part 15 and with the aid of it the counterpart is partially arranged through the side wall 2 of the tyre inside the tyre so that the side wall of the tyre next 20 to the point of intersection is set between the cutting blade 8 and the counterpart 14. When the tyre 1 is rotated in relation to the blade unit 7 of the cutting device to the direction of the arrow 32, the side wall 2 of the tyre pushes in between the cutting blade 8 and the counterpart 14, in which case the friction between the tyre to be rotated and the cutting blade 8 also rotates the cutting blade to the direction of the arrow 33 so that a shear force directed to the side wall of the tyre is formed between the cutting edges of the cutting blade and the counterpart.
Figure 6 shows from the direction perpendicular to the side wall 2 of the tyre, how the side wall is being cut with the blade unit of the cutting device according to an embodiment of the invention. The counterpart 14 is partially arranged through the side wall 2 of the tyre inside the tyre so that the side wall of the tyre is set between the cutting blade 8 and the counterpart 14 next to the point of intersection. The tyre is rotated to the direction of the arrow 34 so that the side wall 2 of the tyre pushes in between the cutting blade 8 and the counterpart 14, in which case the tyre also rotates the cutting blade 8 so that a shear force cutting the side wall of the tyre is formed between the cutting edges 9, 17 of the cutting blade and the counterpart, the cutting trace 5 caused by which shear force is seen in the side wall 2. In the direction of the radius of the tyre it can be chosen, in which point it is desired to cut the side wall 2 between points A and B, in which B is that part of the side wall, which is nearest the tyre tread 3.
In Figure 7 it is shown two blade units 7, 7a of the cutting device cutting the side walls 2, 2a of the tyre in the direction perpendicular to the tyre tread 3 and in the direction of the axes 10, 10a of the cutting blades. The curvature of the tyre tread
3 cannot be seen from the figure. Arrows 35 and 36 show, to which direction the cutting blades rotate when rotating the tyre. The parts of the counterparts shown in dashed lines are arranged through the side wall inside the tyre. A sharp tip part 15, 15a has been arranged to both ends of the counterparts. In that case, the counterparts of the two blade units can be transposed, since their cutting edges 17, 17a have been arranged to wear in the longitudinal direction of the counterpart elsewhere than in the middle. To facilitate the transposing and mounting of the counterparts they have been fixed to the frame of the blade unit only with one bolt.
Figure 8 shows a situation of Figure 7 seen from a direction perpendicular to the axes of rotation 10, 10a of the cutting blades. The side walls 2, 2a of the tyre push in between 20, 20a the cutting edges of the cutting blade 8, 8a and the counterpart 14, 14a, to which a shear force directed to the side wall is formed when the tyre rotates the cutting blade.
Figures show advantageous embodiments of the invention. The Figures do not separately show matters that are irrelevant in view of the main idea of the invention, known as such or obvious as such for a person skilled in the art. It is apparent that the invention is not limited exclusively to the examples described above, but that the invention can vary within the scope of the claims presented below. The dependent claims present some possible embodiments of the invention, and they are not to be considered to restrict the scope of protection of the invention as such. Also the reference numbers are not to be considered to restrict the invention.

Claims

1. A tyre cutting device comprising
- a frame (11 ), - at least one blade unit (7, 7a) comprising
- a cutting blade (8, 8a), which is rotatable around its axis (10, 10a) and arranged in connection with the frame (11 ) via the axis, which cutting blade has a cutting edge (9), and
- a counterpart (14, 14a) comprising a cutting edge (17, 17a) and which counterpart has been arranged in connection with the cutting blade so that the side wall (2) of the tyre (1 ) to be cut is arrangeable between the cutting blade and the counterpart, and
- means for rotating the tyre in relation to the blade unit, which said cutting blade is rotatable in relation to the counterpart so that a shear force is formed between the cutting edge (9) of the cutting blade and the cutting edge (17) of the counterpart, characterized in that the counterpart (14, 14a) comprises a sharp tip part (15, 15a) for arranging the counterpart at least partially through the side wall (2, 2a) of the tyre.
2. Tyre cutting device according to claim 1 , characterized in that the cross section of the cutting edge (9) of the cutting blade in a direction of a plane perpendicular to the axis of rotation (10, 10a) is substantially circular.
3. Tyre cutting device according to claim 1 or 2, characterized in that the counterpart (14,14a) is arrangeable in connection with the cutting blade (8, 8a) stationarily in relation to the frame of device.
4. Tyre cutting device according to any of the preceding claims, characterized in that the cutting blade (8, 8a) is freely rotatable around its axis (10, 10a) and that the cutting device lacks means for rotating the cutting blade.
5. Tyre cutting device according to any of the preceding claims, characterized in that it comprises two blade units (7, 7a).
6. Tyre cutting device according to any of the preceding claims, characterized in that the means for rotating the tyre (1) comprises a gripping element (18) for gripping the tyre and means for rotating the gripping element.
7. A method for cutting the side wall of the tyre with a cutting device, which device comprises
- a frame (11)
- at least one blade unit (7, 7a) comprising - a cutting blade (8, 8a), which is rotatable around its axis (10, 10a) and arranged in connection with the frame (11 ) via the axis, which cutting blade has a cutting edge (9),
- a counterpart (14, 14a), which is arranged in connection with the cutting blade so that the side wall (2, 2a) of the tyre to be cut is arrangeable between the cutting blade and the counterpart,
- means for rotating the tyre (1) in relation to the blade unit, characterized in that
- the counterpart (14, 14a) is at least partially arranged through the side wall (2, 2a) of the tyre, and - the tyre (1 ) to be cut is rotated in relation to the blade unit (7, 7a) of the cutting device so that the side wall (2, 2a) of the tyre pushes in between the cutting blade (8, 8a) and the counterpart and rotates the cutting blade so that a shear force directed to the side wall of the tyre and cutting it is formed between the cutting edges (9, 17) of the cutting blade and the counterpart.
8. Method according to claim 7, characterized in that said cutting device comprises two blade units (7, 7a) with the aid of which both side walls (2, 2a) of the tyre (1 ) are being cut at the same time.
9. Use of the tyre cutting device according to claim 1 in cutting tyres (1).
PCT/FI2007/000187 2006-07-05 2007-07-05 Tyre cutting device, method for cutting the side wall of a tyre and use of a cutting device WO2008003819A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20060656A FI120484B (en) 2006-07-05 2006-07-05 Tire cutting device, method of cutting a sidewall of a tire and use of cutting device
FI20060656 2006-07-05

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10462975B2 (en) * 2016-09-19 2019-11-05 Freddy Dawoud Portable grain silo

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB127970A (en) * 1918-06-08 1919-06-10 North Western Rubber Company Improvements in Rotary Cutting Machines for Slitting Circumferentially the Outer Covers of Pneumatic Tyres and the like.
US4184642A (en) * 1975-10-08 1980-01-22 Dunlop Limited Apparatus for the recovery of vulcanized elastomeric material
AT367685B (en) * 1981-01-13 1982-07-26 Mitterbauer Franz Ing DEVICE FOR DIVIDING VEHICLE TIRES
US4406201A (en) * 1981-08-24 1983-09-27 The B. F. Goodrich Company Fabric cutting
EP0701886A2 (en) * 1994-08-31 1996-03-20 The Goodyear Tire & Rubber Company Method and apparatus for high speed cutting of elastomeric materials
FR2764227A1 (en) * 1997-06-05 1998-12-11 Etienne Ehkirch Scrap tyre cutting and slicing machine
US6240819B1 (en) * 1999-04-22 2001-06-05 Autop Precision Machinery Co., Ltd. Apparatus for cutting a scrap tire
WO2002076692A1 (en) * 2001-03-27 2002-10-03 Michael Raymond Crockford Device to remove side wall from a tyre carcass
US20030150305A1 (en) * 2001-12-12 2003-08-14 Terry Fisher New portable vinyl siding and aluminum cutting tool

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB127970A (en) * 1918-06-08 1919-06-10 North Western Rubber Company Improvements in Rotary Cutting Machines for Slitting Circumferentially the Outer Covers of Pneumatic Tyres and the like.
US4184642A (en) * 1975-10-08 1980-01-22 Dunlop Limited Apparatus for the recovery of vulcanized elastomeric material
AT367685B (en) * 1981-01-13 1982-07-26 Mitterbauer Franz Ing DEVICE FOR DIVIDING VEHICLE TIRES
US4406201A (en) * 1981-08-24 1983-09-27 The B. F. Goodrich Company Fabric cutting
EP0701886A2 (en) * 1994-08-31 1996-03-20 The Goodyear Tire & Rubber Company Method and apparatus for high speed cutting of elastomeric materials
FR2764227A1 (en) * 1997-06-05 1998-12-11 Etienne Ehkirch Scrap tyre cutting and slicing machine
US6240819B1 (en) * 1999-04-22 2001-06-05 Autop Precision Machinery Co., Ltd. Apparatus for cutting a scrap tire
WO2002076692A1 (en) * 2001-03-27 2002-10-03 Michael Raymond Crockford Device to remove side wall from a tyre carcass
US20030150305A1 (en) * 2001-12-12 2003-08-14 Terry Fisher New portable vinyl siding and aluminum cutting tool

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10462975B2 (en) * 2016-09-19 2019-11-05 Freddy Dawoud Portable grain silo

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FI20060656A0 (en) 2006-07-05
FI120484B (en) 2009-11-13
FI20060656A (en) 2008-01-06

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