US2366401A - Removable concrete insert plug - Google Patents

Description

Jan. 2, 1945. l. G. HAsKE-LL I 2,366,401

REMOVABLE CONCRETE INSERT PLUG Filed May 25, 1945 f/n G. HAS/(14 BY A TTG/@NEX Patented Jan. 2, 1945 UNITED STATES TENT OFFICE REMOVABLE; CONCRETE INSERT PLUGV 'Ira' G. Haskell, -San Francisco, Calif-l Application May 25,194.3,- Serial No. 488,380 vs` olf-aims. (o1. 2511s TheY presentv invention relates to removable concrete insert plugs', andY in. particular to suchv devices as are adapted to position a threaded nut orsimilar operationv into` al body material Wherein` it is desired to have any imbedded nut. The invention nnds special advantage in positioning nuts in.concrete,. mortar and the like-Which are poured or applied in semi-fluid or plastic: condi tion' and. which. harden-Kupon being deprived of moisture. i

In lcuiildingl 'operations it is well known that much construction work employs; temporary I forms into which ,orv upon which concrete mix is poured toiiorm', when hardened, a walli or floor. In manyinstancesit' is desired to hangpipes, fix-- tures or the likeuponthese walls or suspendl them from a ceiling. Therefore, it is desirable that a hole be pre-formed? in the concrete for fastening they object thereto.. Where it is desired to mount a xture or a bracket,- it is desirable to have a` threaded nut` imbedded in the concrete at the bottom of the hole whereby the fixture or bracket vmay be threadedly connected.r It isespecially advantageous that the means'` for forming such hole or for positioning the nut be readily removable', both with respect to the hardened concrete and also thel temporary forms.

Among the objects ofthe invention are to provide adevi'ce for pre-forming a hole or for posi-- tioning a threaded nut or the like ina plastic body which hardensupon setting. Another ob' ject isto provide for positioning' a4 nut orthe likeina predeterminedfposition relative to forms into which plastic material is to be poured', and which devicel may be readily removedl from the plastic' material. after it hasA hardened; leaving the nut in; the accompanying drawing, and'pointed out inthe claims heretovappended, it being understood that various changes in theA form, proportion, size and details of construction of the apparatus may be resorted to within the scopeof the appended claimswithout departing from the spirit or sacrificing any of the advantages of' the invention. Y

ToA more clearly* comprehend the invention, reference is direotedto the accompanying drawing,I wherein:

Fig.. 1` is a sidey elevation of theinvention partly in-section.

Fig, 2 is a front view' of a key locking plate.

Fig. 3 isA a side elevation partly in section ofk a.

' mo-diiied ormof the device shown inFig. l.

Fig. 4 is a side eleva-tion partly in section of another modified form of device shown in Fig. 1.

Eig. 5. is a fragmentary perspective view of the structure shown inv Fig. 4.

` Fig.. 6 is a. side elevation partly in section of ay modified form ofthe invention.

Fig. '7 is a bottom viewfof the structure of Fig. 6. Referringtothe drawing' inv which likereferenceacharacters indicate corresponding parts in the several Views, l0 is a shank of a pole-like. plug member,l preferably tapered conically from a. central portion toward. one end. Where the device isrdes-ired for use-insetting a nut into ooncretethe end ofsmaller diameter of the tapered shank. is provided with threadslil for mounting thereon of a correspondingly threaded nut 12;.

andtherebeyondfthe said end may have a portionv of lesser.y diameter which provides an integral rounded. head' orr butto-n i3 which will pass through` thel openingl in the nut and provide a button which may be hammered Without mutilation of *the threads1 at the. tapered end of lthe y shank.. The end of the tapered shank of smaller diameter of slightly larger diameter than its adjacent, threaded portion so that the threads may readily pass through the opening left in the. from' concrete upon. removal of the insert plug the hardened concretev body.

. The opposite end of` the sh'ankis for insertion' in one; Wall: of the body ofthe usual temporary ypouring forms, which,r in theA case of a vertical wall,y are relatively spaced and between whichr theserni-iluidfy concrete is poured; whereas, in the case of a horizontal licor. or ceilingA there may be.

only one horizontal form, usually called a deck I4, whichr isl illustratedr herein as exemplifying. onezuse'to-which the invention may be put.

In` Fig. 1 said opposite; end ofthe shank is provided; with.ar fixed axially extended stub member l5 whichv preferablyfh'as its side walls flattened for engagement byy a wrench, 'such Walls being 1 i11ustrated herein as hexagonal in lateral transverse section. After the temporary forms' have been erected; suitable holes I'B are bored at predetermined places` in the forms and the stub I5V isins'erted therein, preferably having engagement with thefwalls ofthe hole along the angles formed by the intersecting planes of the stub walls and thereby providing sufficient grip between the stub and the forms so that the stub will normally be held in place in a circular hole and yet not provide such a large frictionally engaged area so that it will be diincult to remove the forms after the concrete has hardened. If the t of the stub l5 in hole l5 is substantially snug, a hammer fmay be employed to tap the head or button I3 and drive the plug into the hole. To further insure the maintenance of the device in the form against inadvertent removal such as striking thereagainst of the foot of a workman on a deck or by the pouring and agitation of the concrete mix, a releasable locking means indicated Il is provided. In Fig. 1 this locking means cornprises a machine screw I8 threadedly engaging a threaded recess in the stub l5, and a slotted key plate I9 having an o-pening 26 through which the head of screw I8 may be inserted and a narrower communicating slot 2| in which the shank of the screw may slide. Other forms of releasable locking means may also be employed, but the screw and key plate in Fig. 1 provide the advantage of being adjustable in the event thatthe forms are of greater thickness than the length of the stub'15. Intermediate the ends of the insert plug and preferably at the juncture of the tapered shank Ill and the stub l5 there is provided a xed radially extending shoulder ange 22 providing at one face a base 23 and having its opposite face tapered upwardly and inwardly, preferably arcuately as at 24 from the circumferential edge of the shoulder ange toward the base of the tapered shank.

In the modications of Figs. 3, 4 and 6 of the members IU, Il, l2, I3 and 22 may be the same asin Fig. 1.

It may sometimes happen in pouring forms for vertical walls where two spaced forms are neces* sary that the setting of a concrete insert plug may have been inadvertently omitted until the forms have reached an elevation far above the points at which it is desired to place one of the insert plugs. Usually the form of device shown in Fig. 1 may be utilized in such an instance by cutting the usual hole I6 in the form and piloting the removable insert plug down between the forms on a suspended wire and feeding the stub l5 into the hole by fishing with any sort of suitable hook or bent wire inserted through the hole. However, if this is impractical, either because of location of the omitted removable insert plug or because of having omitted a large number of them ,the modications of Figs. 3 and 4 are advantageous.

In the modification of Fig. 3 the hole Ilia is cut into the form at the desired p-lace and the assembly of shank Il), nut l2 and shoulder ilange 22, together with a ller member or collar 25, are inserted through the hole. Manifestly the hole la must be cut of sufficient diameter to receive such member therethrough. The ller member or collar 25 fills the vacancy around the stub I5 so as to provide a snug t in the hole 16d. The key plate I9 may be employed as a releasable locking means and the device stabilized relative to the form by nails 25 driven through the ends of slot 2| and into the forms. Similar nails for a similar purposeV may also be employed if desired in the device indicated in Fig. 1.

In Figs. 4 and 5 a modification is shown wherein the stub member |5a is provided with `two aty sides 21 and has intervening portions of its circumference threaded as at 28. Thus, the at sides are suitable for engaging a tool for removal of the device, as hereafter explained, and the threads serve to engage a recessed nut 29 in which the collar portion 3U fills the vacant area of an enlarged hole 16a, and the top or cap 3| serves as a hangs-engaging the outer face of the pouring forms to stabilize the insert plug in position. Nails 26 may also be employed to further stabilize the insert device, especially if the device were being used in overhead forms.

In themodication of Fig. 6 the stub for engaging in the pouring forms comprises a spike member |5b which may be driven into the body of the pouring forms. Where the spike member |512 is employed, yit is preferred that it be foursided and tapered similar to a pyramid having its sides arcuate or dished at their base, as indicated in |50 in Fig. '7 so that the frictional grip in the body of the forms will be over a diminished area.

In operation the insert plugs are set in the body of the forms at predetermined places, those of the types of Figs. 1, 3' and 4 being suitable holes cut in the forms to receive them, and the modification of Fig; 6 being driven into the body of the form. The locking means l1 is then engaged and nailed, if necessary. Where it is desired to imbed a nut in the concrete, the nut I2 is mounted on the threaded end of the shank when the insert plug is positioned in the forms. The concrete or the like is then poured into the prepared temporary forms, agitated where necessary to settle it and permitted to harden in the usual manner. Obviously, the concrete surrounds the shank |0 of the insert plug and including the nut l2; and the tapered face 24 of the flanged shoulder member 22 is imbedded in the face of the concrete with the opposite face or base of the flanged shoulder substantially co-planar with the face of the concrete, while the stub member is engaged in the body of the forms. After the concrete hardens to the desired extent, the locking means is removed from the stub and the temporary pouring forms are likewise removed. This leaves the insert plug set in the hardened concrete with the stubs I5, |5a, I5b extending from the face of the concrete. The stub being of such shape as to be readily engaged by a tool such as a Wrench, may be gripped for axial rotation. Manifestly, the nut |2, which will be of the angular type, will not rotate with the shank, but will remain set in the hardened concrete. Because of the upward and inward incline of the upper wall 24 of the shoulder flange and the taper of thev shank I0, those members will break the seal with the concrete very readily, whereupon the plug may be pulled from the formed hole in the concrete wall. Where the nut l2 is employed, it becomes fiXedly imbedded at its predetermined position in the concrete and the rotation of the shank relative thereto releases the shank for removal from the nut. In fact, the relative threaded engagement of the shank and nut facilitates the removal of lthe shank from the concrete upon rotation of the shank, since the pitch of the cooperating threads forces the shank and shoulder flange from their seats in the concrete.

It is to be understood that I have used the term concrete herein in a generic sense to include all types of plastic or moldable material which may be poured or formed in a fluid or semi-huid state and hardened thereafter. The mode of operation of the device would be identical in use with all such materials.

Havingr thus described the invention, what is claimed as new and patentable is:

1. A removable concrete insert device comprising a plug having a tapered shank at one end portion and having at its opposite end an integral stub extension portion adapted for engagement into the body of pouring forms, and said plug having intermediate its stub and shank an integral radially, outwardly extended shoulder member which has one of its faces smooth and tapered inwardly and upwardly toward the tapered end of the shank.

2. A removable concrete insert device comprising a plug having a shank at one end portion, the said shank being threaded for mounting a nut adjacent its terminal end, said plug having at its opposite end an integral stub Aextension portionl adapted for engagement into the body of pouring forms, and said plug having intermediate its stub and shank an integral radially, outwardly extended shoulder member having one face smooth and tapered inwardly and upwardly toward the nut-receiving end of the shank.

3. A device of the character described, including a tapered shank at one end portion and having its smaller end threaded for-mounting a nut, said plug having at its opposite end an integral stub extension portion adapted for engagement'25 into the body of pouring forms and said plug having intermediate its stub and shank a radially, outwardly extended shoulder member which has one of its faces smooth and tapered inwardly .and upwardly toward the tapered end of the shank.

4. A removable concrete insert device comprising a plug having a tapered shank provided at its smaller end portion with a thread to receive a threaded nut and having a portion extending therebeyond of lesser diameter than the threaded portion, said plug having at its opposite end an integral stub extension portion adapted for engagement in the body of pouring forms and having its sides flattened for engagement by a tool, and said plug having intermediate its stub and shank an integral radially, outwardly extended shoulder member having one face tapered toward the smaller end of the shank.

5. A device of the character described, including a tapered shank having at its smaller endv a portion adapted for mounting a nut, said plug having at its opposite end an integral stub extension portion adapted for engagement into the body of pouring forms and having locking means for releasable engagement by a lock member, said plug maving intermediate its stub and shank an integral radially, outwardly extended shoulder member having a smooth face tapered toward the smaller end of the shank, and a lock member for releasably engaging the locking means of the stub, whereby the plug may be secured against inadvertent removal relative to the pouring 5 forms.

l0 stub extension portion adapted for engaging into the body of pouring forms, said plug having intermediate the tapered shank and stub an integral radially, outwardly extended shoulder member providing a flat base at one face thereof ,for contacting the forms and having its opposite face smoothly tapered inwardly and upwardly toward the nut-receiving end of the shank.

7. A concrete insert device of the character described, including a tapered shank having at its smaller end portion a thread to receive a threaded nut and having a portion extended therebeyond of lesser diameter than the threaded portion, said plug having at its opposite end an integral stub extension portion adapted for engagement into the body of pouring forms and provided with flattened sides for engagement in removing the plug from poured concrete, a shoulder member intermediate the stub and shank vand extending radially outwardly from the axis thereof, said shoulder member having one of its faces tapered inwardly and upwardly toward the nut-receiving end of the shank.

8. A removable concrete insert device comprising a plug having a shank tapered from a base toward an end portion threaded to receive a threaded nut and having a portion extended J therebeyond of lesser diameter than the threaded portion, said plug having at its opposite end a stub extension portion adapted for engagement 0 into the body of pouring forms, said stub having flattened sides for engagement in removing the plug from poured concrete and having locking means for releasable engagement by a lock member, an integral shoulder member intermediate the stub and shank and extending radially outwardly therefrom, one of the faces of said shoulder member being tapered smoothly inwardly and upwardly 'toward the nut-receiving end of the shank, and a lock member for releasably engaging the locking means of the stub, whereby the stub may be secured against inadvertent removal relative to the pouring forms.

f IRA G. HASKELL.

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