US1726286A - Holder for anchor bolts and the like - Google Patents

Description

Ag. 27 1929. G, A, BENNE 1,726,286

HOLDER FOR ANCHOR BOLTS AND THE LIKE Original Filed Sept. 29, 1924 Patented Aug. 27, 1929.

UITED STATES 1,726,286 PATENT ()FFICE.

GEORGE A. BENNET, O'F MONTREAL, QUEBEC, CANADA.

HOLDER FOR ANCHOR BOLTS AND THE LIKE.

Application filed September 29, 1924, Serial No. 740,663, and in Canada. June 4, 1924. Renewed January This invention relates to a device for holding anchor bolts and the like in position in concrete forms during the pouring and setting of concrete in such forms, and the object of the invention is to provide an inexpensive and easily operated means by which anchor bolts may be accurately located in proper place and rigidly held during the pouring and setting of concrete around them.

A. furtherobject is to provide a device which may be readily separated from the forms.

Various other objects and advantages of the invention may be ascertained from the following description.

The invention consists briefly in providing a strip of metal apertured intermediate its ends for engagement with a bolt at a point remote from the Wooden forms in which the bolt is'supported preparatory to the pouring of the concrete. The strip is bent to extend into contact with the wooden forms at points adjacent the ends of the strip and is adapted for temporary attachment to the forms. Preferably the strip is designed to co-operate with the threads of the bolt so that the bolt may by rotation be pressed against the wooden form to tension the strip and enable the same to support the bolt rigidly. The head of the bolt is positively positioned on the wooden form by the provision of a seat which may be a recess in the wooden form or a circularly apertured plate secured to the form.

In the accompanying drawings, which illustrate one embodiment of the invention:

Fig. 1 is a vertical sectional view of a fragment of wooden form with concrete thereon, illustrating an anchor bolt and holder in position.

Fig. 2 is a plan View of the device.

Referring more particularly to the drawings, 11 designates a wooden form upon which concrete 12 has been poured to form a beam, floor slab, machine foundation or the like. When anchor bolts or the like 1.3 are to be embedded in the concrete their position is marked out on the wooden form. The means at present used to hold such bolts in position are more or less haphazard and it is frequently found that after the concrete has set that the bolts have been accidentally shifted from their proper location or have been inclined from their proper position during pouring and setting of the concrete.

According to the present invention a holder is provided comprising essentially a strip of metal 14 apertured intermediate its ends, as atl5-, for passage of an anchor bolt. The strip is bent transversely at each side of the aperture and close thereto, as at 16, through angles of something less than 90 so that two divergent legs 17 are provided. At suitable distances from the bends 16 each leg of the strip is bent outwardly, as at 18, through angles substantially equal to those of the bends 16 so that portions 19 of the strip are substantially parallel with the apertured portion. The extremities 20 of the strip are preferably bent toward the plane of the central part, as clearly shown. The structure thus formed is roughly triangular, having at the apex the apertured portion and at the base the outwardly turned portions 19 forming feet upon which the struc ture may stand. These foot portions 19 are each provided with one or more apertures 21 of key-hole shape arranged with the large ends adjacent the central aperture. The central aperture 15 may be threaded to co operate with the threads of the bolt for which it is adapted and which threads form thrust shoulders, or if the strip is thin enough may be merely a punched aperture somewhat smaller than 'the'outside diameter of the bolt, so that co-operation with the threads of the bolt may be obtained. On the other hand, the aperture may be larger than the outside diameter of the bolt and co-operation obtained by means of a nut or collar on the bolt forming a thrust shoulder equivalent to the threads.

When the device is to be used, the position of an anchor bolt is marked out on the wooden form 11 and a seat provided for the head of the bolt, so that the head of the bolt will be accurately positioned and held against displacement. This seat may be provided by making a slight depression in the wooden form, but preferably it is provided by attaching a circularly apertured plate 22, such as an ordinar washer, of suitable size to the upper sur' ace of the form. This attachment may be effected by driving a suitable number of short nails 23 into the form close'around the plate with theirv heads overhanging the plate; or the nails may be bent over the plate. This method of seating the bolt head is preferable to that of pr viding a depression in the form, since by using a plate of proper thickness the head of the bolt is held from the form, thus enabling the head of the bolt'to be completely concealed during the finishing of the concrete. Also, the metal plate provides a more accurate and substantial seat. The anchor bolt 13 is now placed in position, head downward and resting on the seat, so that the crowning of the head causes the same to centre itself accurately on the seat. In the embodiment illustrated the holder 14 is applied to the upper end of the bolt with its legs 17 depending and is screwed down on the bolt until its feet 19 rest on the form. The bolt is then set in proper position and while held in this position the feet of the holder are secured to the form 11, preferably by driving nails24l through the outer or small ends of the openings 21 into the Wooden form. These nails may be of such length that they may be clinched on the underside of theform to hold them against easy withdrawal. Thebolt is now rotated in a suitable direction to cause its head to press downwardly on the seat. This rotation of the bolt causes, by reason of the co-operationeof the holder with the bolt threads, a lifting effect on the holder which brings the same in tension between the bolt and the fastenings 2 1, thus enabling the holder to maintain the bolt rigidly in proper position. With a holder of proper size. a bolt will be so rigidly held that it will not be readily or appreciably displaced by chance blows. 'After the concrete has been poured and is thoroughly set the fastenings 24 may be straightened and the wooden form stripped away in the usual manner, but the forms may if desired be stripped away without any preparatory straightening of the fasteners. When the form 11 is removed it brings with it the seat plate 22 and during the removal the fastenings 24.- draw out of the form and remain suspended from the holder. A light blow with a hammer will sufiice to draw these fastenings into the inner or large ends of the openings 21, through which the heads of the fastenings will pass, thus permitting their easy and expeditious removal without damage to the concrete or to the holder. When the seat plate is removed it leaves a recess in the concrete which may be filled up in the finishing of the surface, if such is desired, so as to completely conceal the headof thebolt.v Obviously, the seat plates or washers may be removed from the forms and used repeatedly. If exposure of the feet 19 ofthe metal strip at the surface of the concrete is undesirable it may be easily avoided by the use of washers between the feet and form, which. washers will come away with the form leaving recesses similar to that left by the plate 22;. or-if desired, the plate 22 rraazse may be of a size to extend under the feet of the holder. The upturned extremities 20 of the holder preclude the possibility of the ends of the holder projecting downwardly from the surface of the concrete due to tension or to some other cause.

It is not essential that the holder itself have cooperative engagement with the threads of the bolt, since obviously the desired tensioning may be produced by the provision of a nut or collar on the threads of the bolt in engagement with the under surface of the holder; or, if the bolt is not threaded, by the provision of a suitable collar or shoulder. In this latter case it will be necessaryfor the eflicient operation of the holder to replace the fixed head of the bolt with a nut which may be rotated about the bolt to lift the same and produce the desired tensioning.

The holder, when in position, obviously presents a resisting shoulder in the concrete supplementing the head in holding the bolt against withdrawal.

While the device forming the subject of this invention is designed primarily and has been described as a holder for anchor bolts, it will be understood that it is capable of other uses. For example, it may be used as a holding or as an adjusting means for furring strips in fioors, Walls, and ceilings- While the device has been shown as embodying only two legs arranged 180 apart, it will be understood that additional legs may be provided arranged less than 180 to more rigidly support a bolt, although this effect may be best obtained by employing two or more holders arranged at suitable angles to one another.

'While the. device has been shown and described as formed of metal strap, it will be understoodthat other materials such as wire may be used to wholly or partly replace the strap. c

Having thus describedmy invention, what I claim is 1. Means to hold an anchor bolt in position for embedment directly in concrete or the like prior to and during pouring of the concrete therearound comprising'a structure including an intermediate portion to be spaced from the form in which the concrete is poured, said intermediate portion presenting an opening for passage of the bolt, legs extending from said intermediate portion and permitting entrance of concrete therebet'ween to embed the bolt head, said legs having at their free ends apertures for passage of fastening means to secure the structure to a form in which the concrete is to be poured.

2. An anchor bolt holder for concrete work and the like comprising, in combina tion with a concrete form and the bolt to be held, a strip of metal apertured intermediate ill) its ends for passage of-the bolt and adapted to co-operate with a thrust shoulder on the bolt at a point remote from the form, said holder being shaped to engage the form at points spaced on opposite sides of the bolt and having key-hole slots in such formengaging parts for the passage of fastening means to releasably secure the holder to the form, whereby the holder may be tensioned and the bolt compressed between the bolt shoulder and the form by manipulation of the bolt to rigidly support the bolt.

3. An anchor bolt holder for concrete work comprising, in combination with a concrete form and an anchor bolt, a seat for the bolt head provided on the form, and a holder comprising a strip of metal apertured intermediate its ends for passage of thebolt and adapted to co-operate with a thrust shoulder on the bolt at a point remote from the form, said holder being shaped to engage the form at points spaced on opposite sides of the bolt and having key-hole slots in such form engaging parts for the passage of fastening means to releasably secure the holder to the form, whereby the holder may be tensioned between the bolt shoulder and the form and the bolt compressed between the holder and the bolt seat by manipulation of the bolt.

4. An anchor bolt holder for concrete work comprising the combination with a concrete form and an anchor bolt, of a circularly apertured plate adapted for attachment to the form to support the bolt head and by reason of crowning on the head to position the bolt, and a holder comprising a strip of metal including an intermediate portion apertured and adapted for co-operation with the threads of the bolt at a point remote from the form, legs extending from the ends of said intermediate portion to the form, feet on said legs for engagement with the form, said feet having key-hole slots arranged with their small ends remote from the bolt for the passage of fastening means and permitting the removal of said fastening means through their large ends after removal of the form.

5. Means for holding anchor bolts to concreate forms comprising a device adapted to encircle the bolt at a point remote from the form and to have engagement with a thrust shoulder on the bolt, said device having openings at points remote from the bolt for the passage of fastening means to attach the device to a concrete form at points spaced from the bolt.

6. An anchor bolt holding means comprising a holding member arched intermediate its ends and having an aperture through which the threaded portion of a bolt may pass, the edge of the member defining the aperture being adapted to co-operate with the bolt threads, in combination with a concrete form to which the ends of the member are rigidly secured and against which the head of-the bolt may press upon rotation, the said form includinga recessed bolt head seat. i a 1 '7, An anchoring 'meanscomprising the combination with a form of an anchor bolt and a holding member apertured for passage of and co-operation withthe bolt threads,'said member being releasably-at' tached' to'a concrete form, and supporting the bolt with its head against the form whereby upon rotation of the bolt the mem ber is tensioned and the bolt held rigidly and in compression between the member and form before and during pouring of concrete in the form.

8. An anchor bolt holder comprising a strip of material apertured intermediate its ends for passage of an anchor bolt and arched between its ends, whereby when supported toward its ends on a form a bolt passing through the aperture and bearing at its head end against such form will be supported a sufiicient distance from the head to maintain the bolt in proper positi0n,'the said strip being adapted adjacent its ends for attachment to a form and the aperture being threaded for co-operation with the threads of a bolt passing through it, whereby upon turning the bolt the strip may be tensioned to rigidly support the bolt.

9. An anchor bolt holder comprising a strip of material apertured intermediate its ends for passage of an anchor bolt and arched between its ends, whereby when supported toward its ends on a form a bolt passing through the aperture and bearing at its head end against such form will be supported a sufficient distance from the head to maintain the bolt in proper position, the said strip being provided adjacent each end with a key-hole slot through the small ends of which slots fastening means may be passedto hold the strip to a concrete form and through the large ends of which the fastening means may be removed.

10. An anchor bolt holder comprising a strip of material apertured intermediate its ends for passage of an anchor bolt and arched between its ends, whereby when supported toward its ends on a form a bolt passing through the aperture and bearing at its head end against such form will be supported a sufiicient distance from the head to maintain the bolt in proper position, the said strip being provided adjacent each end with a key-hole slot through the small ends of which slots fastening means may be passed to hold the strip to a concrete form and through the large ends of which the fastening means may be removed, the bolt aperture of the strip being threaded for co-operation with the threads of a bolt passing through it, whereby upon turning the bolt the strip may be tensioned to rigidly support the bolt.

1 1.: Means to hold an anchor bolt in posiportion and permitting entrance of concrete tion" for embedment directly in concrete 01" therebetween to embed the bolt head, said the like prior to and during pouring of the legs having at their free ends apertures for concrete therearound comprising the combipassage of fastening means to secure the .5; nation with: an anchor bolt to be held, of a structure to a form in which the concrete is 15 structure including an intermediate portion to be poured. p Y to be-spa'ced from the'fiorm in which the con- In witness whereof, I have hereunto set crete is poured, said intermediate portion my hand. presentingan opening for passage of the a p bolt, legs extending from said intermediate" GEORGE A. BENNET.

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