US2680459A - Cam actuated construction clamp - Google Patents

Description

June 8', 1954 c. J. DODSON ETAL CAM ACTUATED CONSTRUCTION CLAMP Filed Oct. 17, 1950 CLARENCE'MGARDNEP @CLAZ/DE JIDODSON ATTORNE'Y Patented June 8, 1954 UNITED stares rarsur :oFFICE 2,680,459 CAM ACTUATED CONSTRUCTION CLAMP Claude J.

Brevard,

.Nemours & Compan vDodson an N. (3., assi d Clarence M. nors to -E. I.. y, Wilmington, -Del.,-a 'cor- .poration of Delaware Gardner, du Pont de Application October 17, 1950,-'-Serial No. 190,599

2 Claims.

setting of the mix.

In the construction of concrete walls, and similarstructures, it has been the practice to employ :relatively large unitarypanel forms, which may or in other ways.

b1 ssed by a succession of horizontal timbers, the outer ends of which are restrained from movement by stakes driven into the ground.

To withstand the severe stresses to which con form elements firmly together during erection, so that relative movement between the parts cannot occur. For this movement "thatrisrrelia'ble in;

Usually, the assembled forms are finally butof bolt .H.

Another .objectnf :this: invention is to provide a clamp for;the:assembly-:of walessand'stifibacks operation. Another object :of tthis invention is a clamp tofawaiestand :stifibacks which may,

cated I from .astan'dard "stock materials that are usually available, :particularly on construction sites.

Other objects 0 will becom'aaprdetailedxi'escription herein when Fig. 1.1's a: toprplan view of one" embodiment of a clamp: made in'accordance with i this invention,

Fig. 2 .is a side'relevation :viewof thet'clamp 'of Fig. .1,

Fig. 3is-a sectional'view taken along line 3-3 Fig. 41s apersp'ectiveiview showing the manner in which wales LEtIGLSGCIllGdtO :stiffba'cks :by

I this improved icla'mp.

Referring to Figures 1,12 and.3, .oneembodi- 'ment of clampiaccordingtothis invention com- .prisestwoxelawaarms'iliil which :are provided with holes nearitherearward ends for the reception Nut 4.221s :threacledly engaged with provideoluvith a cottertpin (not shown), .to pre- 30 .The central p01- of rollers l3 and claw arms Iii, providing bearing surfaces for rotation of roller I 3 into or out of clamping position.

Roller I3 is provided The clamp preferably provided with a slidable bearing plate It mounted plate it which is loosely mounted on the arms It as shown by the horizontal dotted lines in Figure 1 and the vertical dotted lines in Figure 2 will be freely slidable along the arms as roller [3 is rotated into either open or clamping position, while still being prevented from disengagement from the arms. This also permits free, vertical claw end of either arm independent of the other during assembly of the device with the stiiiback and wale.

By reference to Figure 4, it will be seen that when in use the claw arms of the clamp are made to straddle the stifiback 18 with the claw the top wale I9 of the pair of wales. As hereinbefore described, the two wales are secured against the studs of the form panels 20 by wedges 2| and ties 22. When handle [5 is depressed to the position shown in Figure 4, roller I3 is turned so that its greater radius is brought to bear against plate l6, forcing the plate against the rear surface of stifiback l8 and thereby locking the stiffback and wales firmly together. The clamp may be disengaged by simply pulling handle 15 into prolongation with claw arms H], which action turns roller I3 so that a smaller radius is interposed between bolt H and plate "5. In the latter position all tension on arms I0 is released and the claw ends may be lifted from the edges of the wales without difficulty.

It will be obvious from the foregoing detailed disclosure of our invention that various modifications will suggest themselves to those skilled in the art without departing from the spirit thereof, and we do not therefore intend to be limited except as set forth in the following patent claims.

We claim:

1. A device for connecting and retaining vertically positioned stifibacks against horizontally positioned wales in temporary forms for concrete structures and the like, comprising in combination a pair of independently adjustable claw arms mounted in parallel spaced relation and capable of assuming a horizontal position when in operation and forming rectangular and unobstructed or free opening therebetween to accommodate a vertically positioned stifiback while the forward ends engage a wale in horizontal position, a follower comprising a floating plate member, having openings at its ends loosely engaging each of the claw arms and serving as the sole supporting means for said follower and limiting its movement within said free space, means for pivotally and adjustably mounting and maintaining said arms in substantially parallel relation comprising a bearing means and an elongated eccentrically positioned cam means rotatably mounted with its end portions engaging the opposing sides of said claw arms, and means for rotating said cam means to exert pressure against said floating plate in the direction of a vertically positioned stifiback when placed within said free space.

2. A device for connecting and retaining vertically positioned stifibacks against horizontally positioned wales in temporary forms for concrete structures and the like, comprising in combination a pair of claw arms mounted in parallel spaced position to accommodate the upright vertically positioned stifiback therebetween and asflexible or adjustable relationship outside the space or opening provided to accommodate the stifiback, and pivotally mounted connecting means maintaining said arms in said flexible or adjustable position during assembly comprising a bolt extending through horizontal openings in the end portion of each of the arms, together with a cam means pivotally mounted thereon and serving as the sole means for maintaining said arms in substantially parallel position or relation, and a floating plate member loosely mounted upon each of the arms adjacent to said cam means and movable by rotating said cam means thereagainst to urge the plate in the direction of the stiiiback.

a substantially 1 References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 60,091 Tice Nov 27, 1866 136,399 Wilmot Mar. 4, 1873 176,752 Marsh May 2, 1876 256,026 Morden Apr. 4, 1882 497,550 Russell May 16, 1893 793,412 Bliss June 27, 19 5 1,084,379 Wile Jan. 13, 1914 1,273,809 Beazell July 30, l9l8 FOREIGN PATENTS Number Country Date 350,791 France Apr. 19, 1905'

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