US2347126A - Concrete form and holder - Google Patents

Description

April 18, 1944. J RQHRER 2,347,126

- CONCRETE FORM AND HOLDER .Fiied July 25, 1942 INVENTOR far/Z 1 Rob/Zr,- BY 0 TTORbiEY Patented Apr. 18, 1944 UNITED STATES PATENT OFFICE CONCRETE FORM AND HOLDER.

Emil J. Rohrer, Kansas City, Mo.

Application July 23, 1942, Serial No. 451L991 Claims.

This invention relates to forms and supports therefor and more particularly to an adjustable holder or support for form bars for concrete slab work or the like, the principal object of the invention being to provide a form bar and support which may be adjusted to selected grades.

In constructing concrete floors or the like it has been the general practice to make a rough grade by a steam shovel or the like and then to locate boards and stakes to determine the thickness, grade, slope and/or the level of the slab concrete to be placed thereon, and additional dirt is removed or leveled by hand to obtain a finished grade. In the use of boards and stakes, however, it is necessary to remove the boards after the finished grade has been determined and made in order to place the wire mesh usually required in such structures. Then it is necessary to replace the boards, nailing them on the stake in order to have a gauge for the surface of the concrete and, of course, in the replacing of the boards, it is necessary to duplicate the work required in determining the grade.

Other objects of the invention are therefore to provide a form holder from which the bars can be easily removed for application thereto of wire reinforcing mesh; to provide a support capable of carrying the weight of a concrete screeding machine; to providean adjustable support for bars; to provide for the use of permanent bars and holders which will not be damaged in use; to provide bars which may be easily and quickly placed in position and removed for reuse after the pouring and placing of concrete; to provide a bar supporting bracket capable of tightening its grip on a supporting post in response to weight applied'by r on said bar; to provide a bracket which cooperates with the supporting post to form a seat for the bar; to provide spaced post engaging i embers on the bracket; to provide for supporting the load on the bracket in offset relation to the post to apply a leverage to the post engaging members for locking the bracket in'place; and to provide improved elements and arrangements thereof in a wall structure of the character and for the pur poses noted.

In accomplishing these and other objects of the present invention, I have provided improved details of structure, the preferred form of which is illustrated in the accompanying drawing, wherein:

Fig. 1 is a perspective view of a slab structure under construction in which form bars and supports embodying the present invention are used.

Fig. 2' is an elevational view oi the form bar and" support. Fig. 3 is a vertical sectional view through the form bar and support in position in a concrete slab structure.

. i Fig. 4 is a perspective view of the bar supporting bracket. 1

Referring more in detail to the drawing: 1 designates a base for a concrete floor or other structure on which the concrete is to be placed and into which a plurality of posts 2- may be driven. The posts 2 are preferably made of iron or steel bar stock and are of sufficient strength to withstand considerable strain from the form structure as will presently be described. 3, Fig. 4, represents a bracket preferably made of metal, having a U-shaped portion 4, preferably consisting of horizontally disposed legs 5 and 6 connected by a vertical web I, the legs 5 and B being provided with holes 8 and 9 adapted to receive the post 2. The vertical web of the bracket 3 is also provided with a hole l8, threaded as indicated atll and adapted to receive a set screw I2 which may be threaded into engagement with a post extending through the holes 8 and 9 for locking the bracket 3 at any desired position on the post 2.

The upper leg 5 of the U-shaped portion of the bracket extends outwardly and upwardly forming a flange l3 for cooperating with the post to form a seat M for supporting pipes or bars and it which form guides which may be positioned at the desired elevation above the base I for determining the grade and thickness of the concrete to be laid; and also for supporting screeding equipment of conventional form.

In'assembling a structure according to my invention, two rows of posts 2 are driven in the base 1, preferably until the upper end of the post is slightly below the approximate level of the concrete, the bars being arranged a predetermined distance apart in longitudinal and transverse alignment, as illustrated in Fig. 1. The brackets 3 are then applied to the respective posts 2 with the post extending through theholes 8 and 9 whereby the upper portion of the post cooperates with the leg 5, and flange l3 to form the'upwardly opening seats M adapted to receive the pipe or bars l5 and iii. A cross-bar or pipe !8 is then arranged with its ends on the respective pipes or bars l5 and It. By adjustment of the bracket 3 on the post 2 the height of the pipes or bars|5 and it carried thereon may be changed until the upper edge of the pipes or bars are at the desired grade or incline relative to the floor as determined by a level in the conventional manner. The set screw I2 is then moved into engagement with the respective post 2 to hold the pipes or bars in that position.

After the brackets are set on posts in the desired position and the set screws tightened so that the brackets do not slip, the pipes or bars I5, l6 and 18 are removed. Reinforcing material l9, preferably of wire mesh, having openings 20 of sufficient size to pass over thebrackets 3 on the posts 2, is then placed on the base upon which the concrete structure is to be laid. The reinforcing material may be placed on the base before the posts are driven in place if desired, but I have found that in most instances additional hand grading must be done on the base I to obtain the proper thickness and grade for the concrete.

The pipes l5 and I6 may then bereplaced in the seats M of the brackets 3. The pipes or bars are held in the seat M by the flange I3 and post 2 in such a manner that the weight of the pipes is applied to the bracket at a point spaced from the post causing the bracket to tilt and theopposite edges of the holes 8 and 9 to engage and bite into'the post. This leverage action tightens the bracket on the post in response to additional weight on the pipes so there is no danger of slippage when heavy rodding machines or like equipment are used for screeding the concrete. Concrete, as indicated at 2|, may be poured between the pipes i5 and I6 and the upper surface of said pipes used as a guide for a strike-off to level the concrete slab with a rodding machine or other screeding equipment 22 having-leveling rods 23 and 24 in the conventional manner, as shown in Fig. 1.

After the concrete slab has been leveled oil? flush with the pipes l5 and i6, as illustrated at 25, the pipes may be removed, and the brackets 3 and posts 2 removed. The holes and indentations left in the concrete by the pipes, brackets and posts may then be filled with concrete, as is common practice with wooden forms heretofore in use. The posts, brackets and pipes are then available for use and may be assembled on a second site for laying a second slab. This may be repeated as many times as desired on one or more constructions.

It will be observed that when starting the construction of a concrete slab according to my in- 'vention,1a side form 26, preferably of wood or the like and of slightly less height than said bar, may be placed alongside the bar l6, Fig. 1, to prevent the concrete from running away on that side and to provide a substantially plane surface for the side of the concrete construction.

While I preferably use iron pipe or tubing for the pipes l5, l6 and I8, wood or other suitable material may be used.

It is apparent, therefore, that I have provided a form and support therefor which is strong and adapted to carry the weight of any equipment ordinarily applied to such structures, which is adaptable to all types of slab work, and which is quickly and easily set up and disassembled.

What I claim and desire to secure by Letters Patent is:

1. In a form of the character described, a post,

a bracket adjustable vertically on the post having spaced members engaging said post, a set screw in the bracket engageable with the post for holding the bracket in adjusted position, and means on one of the post engaging members extending laterally and upwardly from the post and cooperating therewith to provide an upwardly diverging form seat therebetween.

2. In a form of the character described for use inconcrete structures, a post adapted to be inserted into a base of the structure for support in an upright position, a Ushaped bracket having a web and laterally extending legs, said legs having aligning holes therein for insertion of the post, means attached to and extending through the portion engageable with the post for holding the bracket in an adjusted position, an upwardly turned flange on the end of the upper leg and on the opposite side of the post to the web of the bracket for cooperating with the post to form an upwardly diverging seat therebetween.

3. In a form of the character described for use in concrete structures, a post adapted to be driven into a base of the structure for support in an upright position, a U-shaped bracket having a web and laterally extending legs, said legs having aligning holes therein for insertion of the post and adapting the bracket for vertical movement on said post, a set screw extending through the web portion engageable with the post for holding the bracket in an adjusted position, an upwardly and outwardly turned flange on the end of the upper leg on the opposite side of the post to the Web of the bracket for cooperating with the post to form a substantially V-shaped seat adapted to receive a screed support whereby weight of the screed support acts against said post and flange to apply an outwardly directed force to the bracket to tilt the bracket on the post to form a bight thereon for anchoring the bracket in position.

' 4. In a form of the character described, a post, a bracket slidable vertically on the post and having vertically spaced members engaging said post,

and a laterally and upwardly extending portion on the upper member for co-operation with the post to provide an upwardly diverging seat whereby a guide member applied thereto engages said post and upwardly extending portion and applies an outwardly directed force on said portion exerting a leverage on the space members of the bracket to hold said bracket in position on said post.

5. In a form of the character described, a post, a bracket slidable vertically on the post and having vertically spaced membersengaging said post, a laterally and upwardly extending portion on the upper member for (go-operation with the post to provide an upwardly diverging seat whereby a guide member applied thereto engages said post and upwardly extending portion and applies an outwardly directed force on said portion exerting a leverage on the space members of the bracket to hold said bracket in position on said post, and means for holding the bracket in place on the post before application of the guide member.

EMIL J. ROHRER.

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