US2891759A

US2891759A - Shore head brace

Info

Publication number: US2891759A
Application number: US528149A
Authority: US
Inventors: Sr Lawrence S Holmboe
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-08-15
Filing date: 1955-08-15
Publication date: 1959-06-23
Anticipated expiration: 1976-06-23

Description

June 23, 1959 L. s. HoLMBoE, SR `2,891,759

SHORE HEAD BRACE 2 Sheets-Sheet 1 Filed Aug. 15, 1955 IJ n I a m .f N .I I I l l a. f N I .I I I I I u I I I I I I I I I I I I L I I I I I I I I I I \I` I I I I I I I I I i June 23, s HQLMBQE, 5R I SHORE HEAD BRACE v Filed Aug. 15, 1955 2 sheets-sheet 2 mupuw WW S. Mdmsf.

IN V EN TOR.

SHORE HEAD BRACE Lawrence S. Holmboe, Sr., Oklahoma City, Okla.

Application August 15, 1955, Serial No. 528,149

5 Claims. (Cl. 248-357) The present invention relates to shores for concrete forms and more particularly to braces or brackets for removably connecting crossheads on the upper ends of shore posts.

In constructing forms for horizontal oor slabs, lintels and beams, it is conventional practice to support such forms by wooden posts or shores, each of which is equipped with a horizontal cross-piece or head which is usually from three to four feet in length. Such shore posts and their heads are usually formed of wooden four by four material, with the cross-headsbeingnailed to the upper ends of the posts.Y The pieces of the shore are often cut to size and are nailed together on the job as the form construction progresses and, after the concrete has been poured and has set, the formsare wrecked and many of them are not useable again.

In order to relegate the four by four shore material only to use for shore forming purposes, so that it can be repeatedly used on different jobs, it has been found advantageous to removably connect the cross-head pieces to the upper ends ofthe shore posts, so that they may be dismantled witho-ut damage to either the posts or the cross-heads. This connection is .best accomplished by the use of metal braces or brackets so designed that the cross-heads may be connected to and removed from the shores without damageto either.

The device of the. present invention relates to such connecting braces or brackets. Y

The principal object of the present `invention is to provide a shore head brace which, when once installed on the cross-head, makes it -a simple matter to install the head on Vthe shore .post or to-remove it therefrom.

Another object is to provide a brace of, this class by which the'cross-head is clamped to the shore post without damage to the post by the use of nails or the like.

Another object is to provide a shore head clamp which, under normal stresses and strains, adequately braces the head against rocking movement with relation to the post.

An-additional object isto provide a shore head brace which is permanently bolted to the head, Aand which merely slips over the upper end of the connecting shore post somewhat in the nature of a socket.

Still another object is to provide a shore head brace which is simple and sturdy in construction and may therefore be comparatively cheaply manufactured.

Yet another object is to provide a brace of this class which has all the working parts thereof securely connected together which precludes the loss or misplacement of the same when dismantled or not in use.

The present invention accomplishes these and other objects by providing a substantially right triangularly shaped brace of all metal construction. One side of the triangle is adapted to be rigidly connected to the under side of a cross-head and the adjoining right angular side in vertical depending relation thereto for contacting the Vertical side of a shore post. Intermediate its ends the depending side is provided with a vertically pivoting rectangular endless loop member or stirrup nited States Patent which envelops the shore post. A clamping shoe pivotally carried by the free end of the stirrup acts to grip the vertical side of the shore post opposite the depending side of the brace.

Other objects will be apparent from the following description when taken in conjunction with the accompanying two sheets of drawings, wherein: f

Figure l is a perspective view illustrating the brace of the present invention operatively installed on a shore head and post, the head and post being shown in dotted lines; l Figure 2 is a side elevational view of the se; I v

Figure 3 is a top View of the same; and

Figure 4 is a left end view of the device as seen in Fig. 2.

Like characters of reference designate like parts in those figures of the drawings in which they occur.

The reference numeral 10 indicates a conventional 4 by 4" wooden shore post,rand the reference numeral 1-2 indicates a conventional cross-piece or shore head formed of similar material.

brace per The device of the present invention isV designed to- 17 extending transversely` of the plane of the body 14. Y

The top arm 16 is horizontally disposed on the under side of the head 12 in longitudinal relation thereto, Adjacent the juncture of the top arm 16, with -the leg 18 forming the right angle the body 14 is provided with an extension ange 22 substantially wider than the T-shaped top arm 16 which is vertically perforated for receiving a bolt or lag screw 24 wherebyV the top arm is securely fastened to the head 12. Similarly a ange widening 26 extends from the junction of the top arm-andthe brace leg opposite theextension flange 22 and is similarly plurally perforated for connecting the top arm 16 to the head by a lagy screw 28 or, by nailing. The depending side or leg'18 has its outwardly disposed flat face or surface 30 contacting the adjacent side of the shore 10. The lower end of the leg 18 is provided with an integral horizontal footmember 32, adapted to contact the face of the post 10, -and extending trans versely equidistant on either side of the-leg 18. and is provided at its ends with outwardly projecting lugs orintermediate its ends the vertical'leg 18-is providedl with an integral semi-cylindrical shell-like horizontal cross-member 38 formed on the generally triangular widening 48 of web 19 of the T-shaped leg 18.. The ends 4of the member 38 extend laterally substantially parallel and equidistant with relation to the foot member 32 and are suitably braced to thevweb of 18 and reinforced by lateral anges 50 triangular in shape as shown in.Figs.1

and 4. The arc of the semi-cylindrical cross-,member is disposed toward the face 30 of the leg 18. An` angularly upwardly extending central or cross braceleg 39, cruciform in cross-sectional area, is, integrally `connected at one end to the web of the leg adjacent the cross member 38 and has its opposite end connected to the webs of the top 16 and the brace leg 20 adjacent their point of juncture.

The web of the brace leg 39 is through perforated in cooperative alignment with the inner arc of the crossmember 38 to loosely receive and pivot therein one side of an endless rod-like rectangular looped element, collar or stirrup 40. Transversely the member 4t) is slightly wider than the thickness of the post 1t). The longitudinal length of the member 40 is substantially greater than the thickness of the post 1d. Opposite its pivoted end the member 40 pivotally carries a clamping plate or shoe 42 by a pair of spaced apart cooperating alignedly perforated outstanding ears 44. The clamping shoe t2 has a rectangular substantially dat serrated gripping face 46. The member 40, in cooperation with the shoe 42 and the leg face 30, forms what might well be termed a socket for receiving and holding the upper end portion of the post 1d.

It should be noted that the design and conception in this invention is such that the shore head is capable of sustaining heavy loads on either side even when the load is not balanced by a load on the other side. In Fig. 1, if there is a heavy load on the left side and the right side has no load, or a very light load, there is compression in member 2t) carried to bearing surface 32 and tension in members 39 and Hb carried to pivoting plate 42. On the other hand, if the right side of the short head is heavily loaded and there is little or no load on the left side, there is compression in member 16 carried to bearing surface 22 and tension in members 39 and 4t) carried to pivoting plate 42. As either side is loaded there is a minute pivoting action which prevents edge bearing Which causes weakness; clamping plate or shoe 42 pivots minutely with reference to collar 40 which pivots minutely with reference to bearing bracket surface il. This minute pivoting action permits the at serrated surface 45 of shoe 42 and surface 30 to always remain flat against the wood post and give the shore head great strength to carry heavy loads on either side even when not counterbalanced by equal or nearly equal loads on the opposite side.

When the brace is once bolted to the shore head 12, as above described, the short head may be removably stalled upon the upper end of the post 1i) by merely passing the stirrup or collar 40 over the said upper end of the post 10 and then seating the cross-head upon the post. The shoe 42 may then be tapped downwardly with a hammer to snugly engage the ribbed or serrated gripping face 46 with the side surface of the post 1%. Only a light blow of the hammer is necessary for this purpose. In this position the member itl and shoe 42 are in substantial alignment with the cross brace 39. as

shown in Fig. 1, which aids the device in maintaining the post l@ rigid without placing any undue strain on the frame work of the device.

In order to remove the mechanism from the past 19 so that the head may be removed therefrom, it is only necessary to drive the shoe 42 upwardly with a single blow of the hammer.

Obviously the invention is susceptible to some change or alteration without defeating its practicability, and l therefore do not wish to be confined to the preferred embodiment shown in the drawings and described herein. further than I am limited by the scope of the appended claims.

claim:

1. A shore head brace and clamp for removably attaching a shore head of rectangular timber to the upper end of and resting on top of a shore post of similar rectangular timber and comprising an integral metal brace body of right triangular outline having a horizontal top arm with a continuous dat upper surface to engage under the shore head, a vertical leg with a at outer face adapted to engage a lateral face of the shore post and terminating at its lower end in a horizontally widened foot portion having spaced and parallel lugs positioned and extending from the ends thereof and adapted to engage opposite side faces of the shore post, the top arm and vertical leg meeting integrally and each having laterally widened flange areas at and adjacent the junction, a lower brace leg extending from said foot portion of the vertical leg to the outer end of the top arm and merging therewith into a laterally widened ilange area, said laterally widened flange areas of the top arm being perforated for fasteners to secure the brace to the undersurface of the shore head, a central brace leg connecting the portion at the junction of the top arm and lower brace leg with an intermediate portion of said vertical leg and merging therewith in a generally triangular web portion extending inwardly from said leg and transversely perforated, a semi-cylindrical shell extending in both directions from said triangular web adjacent said perforation and transversely to the brace body, and a continuous rod stirrup in the form of a rectangular link having one side pivoted said perforation and shell, extending around the vertical leg to receive a shore post and having a plate with a gripping surface pivoted thereon for clamping the shore post to the vertical leg.

2. The shore head brace and clamp as defined in claim l in which the said semi-cylindrical shell is of substantially the same length as the stirrup link side pivoted therein to maintain the link centered in respect to the vertical leg.

3. The shore head brace and clamp as defined in claim l in which the pivot area for the stirrup is in direct alignment with the central brace leg for tension load transfer to the stirrup.

4. rThe shore head brace and clamp as defined in claim 3 in which the stirrup and plate are sized to substantially align with said central leg brace when applied to a normal size shore post` 5. A shore head brace and clamp for removably attaching a shore head of rectangular timber to the upper end of and resting on top of a shore post of similar rectangular timber and comprising an integral metal brace body of right triangular outline having a horizontal top arm with a continuous dat upper surface to engage under the shore head, a vertical leg with a flat outer face adatped to engage a lateral face of the shore post, a lower brace leg closing the triangle, said arm and legs having iiat anges extending normal to the general plane of the triangle, a continuous web running around inside of said flanges in the plane of the triangle, a central brace leg of ange and web construction extending from the junction of the top arm and brace leg webs to a position substantially at the center of the vertical leg, and having its web joining said continuous web, an integral bearing through and extending laterally from the merged webs at the junction of the vertical leg and the central brace leg, lateral flanges connecting the vertical leg web to the extensions of the bearing, extending around the vertical leg to receive a shore post and having a plate with a gripping surface pivoted to the opposite side thereof for clamping the shore post, and means to secure the top arm permanently to the shore head.

References Cited in the le of this patent UNITED STATES PATENTS 878,455 Carter Feb. 4, 1908 1,932,072 Holmboe Oct. 24, 1933 2,727,712 Holmboe Dec. 20, 1955 FOREGN PATENTS 233,422 Great Britain May 7, 1925 285,988 Great Britain Feb. 27, 1928