US2724604A - Shore clamps - Google Patents

Description

Nov. 22, 1955 L. GINSBERG 2,724,604

SHORE CLAMPS Filed April 16, 1952 go/Y hwms-wa United States Patent l 1 2,724,604 SHORE CLAMPS Leon Ginsberg, Denver, (3010., assignor to Quick-Way Clamp (10., a corporation of Colorado ing concrete forms in building constructions. Shores are usually cut on the job to the exact building story height for the particular building being constructed. This results in a very great waste of timber, since they rapidly become too short for use on the job.

The principal object of this invention is to provide an automatically acting clamping device whereby a shore formed from two timbers may be quickly and easily adjusted for any desired length or height, and which will accurately maintain the adjusted length or height without the use of nails, bolts, or other fastening devices.

Another object of the invention is to so construct the improved shore clamp that it may be applied to a twosection shore after the latter is in place, so that the clamp may be be placed on the members after the latter are in place.

A further object is to provide a shore clamp which will firmly grip the short timbers to prevent slipping, and which will he exceedingly rigid and sturdy in construction so as to withstand the strains imposed in the usual building construction.

Other objects and advantages reside in the detail con struction of the invention, which is designed for simplicity, economy, and efiiciency. These will become more apparent from the following description.

In the following detailed description of the invention, reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. l is a side view illustrating two of the improved shore clamps applied to a conventional two-section shore;

Fig. 2 is a perspective view of the improved clamp;

Fig. 3 is a fragmentary, detail, top view of the upper portion of the clamp;

Fig. 4 is a detail section, taken on the line 4-4, Fig. 3; and

Fig. 5 is a detail view of a side bar link employed in the improved clamp.

In the drawing the upper section of a conventional shore is indicated at 10, and the lower section thereof at 11.

The improved shore clamp comprises a relatively heavy, round, metal bar bent in a rectangular U-shape to provide a tie portion 12 and two rectangularly turned leg portions 13 and 14. The free extremities of the U- shaped bar may be detachably tied together by means of a connecting bar link 15 having an opening 16 adjacent one extremity for receiving the leg portion 13, and a notch 17 adjacent the other extremity for receiving the other leg portion 14.

The leg portions are designed to support U'shaped shoes. Each shoe consists of a face plate 18 terminating at both extremities in angularly turned ears 19, all formed integrally from a flat steel bar. The leg portions 19 of each shoe are perforated with elongated openings 20 for the passage of the leg portions 13 and 14. The openings 20 are so positioned that the leg portions may move into engagement with the back of the face plates. The face plates 18 of the shoes are concave, both longitudinally and laterally, as shown in Figs. 3 and 4.

The shoes are maintained in place on their respective leg portions by an upset or bulge 21 formed by deforming the metal of each leg portion 13 and 14 adjacent the inner ear 19 of each shoe. The connecting bar link 15 is held in place adjacent the extremity of the leg portion 14 by indenting the metal of the leg to form a protuberance 22.

In use, the two shore sections 10 and 11 are placed together. The U-shaped bars 12, with their shoes, are placed around the overlapped sections, and the notch 17 of the bar link 15 is engaged over the extremity of the leg portion 14. The upper shoe is then held in place against the lower section 11, and the lower shoe is driven downwardly along and against the upper section 10 so that downward pressure on the upper section 10 will cause a swinging and w'edging action which will clamp the two sections tightly together and prevent slippage therebetween.

As the pressure is applied, the horizontal edges of the faces of the shoes will bite into the timbers due to the lateral concavity of the shoes, and the extremities of the shoes will similarly force themselves into the timber due to the longitudinal concavity of the shoes. The leg portions 13 and 14 will also move forwardly in abutting relation with the mid-portion of the backs of the face plates of the shoes due to the elongated openings 20 so that the shoes will be rigidly hacked at their middles to prevent damaging flexure of the shoes.

Each of the shoes is perforated adjacent one edge with a nail hole 23 through which a nail may be inserted so that the upper shoe may he nailed to the lower section 11 of the shore to hold the device in the proper position while the lower shoe is being adjusted and driven to its gripping position.

While a specific form of the improvement has been described and illustrated herein, it is to be understood that the same may be varied, within the scope of the appended claim, without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letters Patent is:

A shore clamp comprising: a metallic bar bent in a flat, rectangular, U-shape to provide a relatively long medial portion and two relatively short, parallel terminal portions; means joining the extremities of said terminal portions; two face plates; and an ear extending rearwardly from each extremity of each face plate at right angles to said face plates, said ears being provided with elongated bar openings, the long axis of said openings being at right angles to the plane of said face plates, each of the terminal portions of said bar passing through the ears of one of said face plates, said face plates being concaved both longitudinally and laterally so that the medial portions thereof will project toward the terminal portions of said bar said openings being sufliciently long to allow said terminal portions to contact the projecting medial portions of said face plates to provide a backing support thereagainst.

References Cited in the file of this patent UNITED STATES PATENTS 309,038 Flach Dec. 9, 1884 326,514 Moross Sept. 15, 1885 901,158 Dettmann Oct. 13, 1908 1,153,552 Hunkin Sept. 14, 1915 1,198,728 Keator Sept. 19, 1916 1,709,919 Sebranski Apr. 23, 1929 1,932,072 Holmboe Oct. 24, 1933 2,005,098 Mayer June 18, 1935 2,455,448 Swalinkavich Dec. 7, 1948 FOREIGN PATENTS 167,899 Austria Mar. 10, 1951

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