US1724035A - Concrete mold - Google Patents

Description

y Aug. 13, 1929. F. J. MEAD CONCRETE MOLD Filed sept. 21. 1925 U// Madd lNvENToR BY JM' ATTORNEYS Patented Aug. 13, 1929.

FRED J. MEAD, or nAsroRANGE, New JERSEY.

CONCRETE MOLD.

`Application filed September 21, 1925. Serial No, 57,495.

This invention relates to a form for molding concrete. It relates more particularly to a form by which concrete boards or slabs may be molded, which are useful for making greenhouse beds or benches, as indicated 1n my patents Nos. 1,296,684 of March 11, 1919, and 1,468,316 of April 29, 1921, although the invention is not restricted to making concrete members of this particular sort.

The invention will be understood from the description in connection with the accompanying drawings, in which Fig. 1 is a perspective view of the assembled device; Fig. 2 is a longitudinal section through the same; Fig. 3 is a similar section on an enlarged scale, partly broken away, taken along the line 3 3 of Fig. 4L; Fig. 4- is a section along the line 4 4 of Fig. 3, Fig. 5 is a perspective view on an enlarged scale, partly broken away, showing a detail, and Fig. 6 is a view similar to Fig. 3 showing a modification. In using this invention forms are made which may consist of only two sorts of bars or members, one sort of which is longitudinal members and the other is end members. These members may be laid upon a floor or any suitable flat surface, and the concrete may be poured or shoveled therein and be permitted to set. As illustrated in the drawings, a door is made of a plurality of boards 10, laid side by side in contact with each other so as to provide a flat surface. The longitudinal bars 11 are then laid upon this floor parallel with each other, and spaced apart a distance corresponding to the desired width of the concrete beam that is to be formed. The bars 11 are preferably made of metal, though other mate-rial such as wood, for example, may be used. These bars are made Wedge-shaped in cross section, with the narrow portion at the top, and with the side walls diverging outwardly to the bottom edge thereof, so that the concrete beams will have their edges beveled, as shown in my prior patent. It is to be understood, however, that these beams 11 may be made with their sides parallel, so as to form concrete beams, with their edges straight instead of beveled. The bars 11 are made of a depth equal to the desired thickness of the concrete beam that is to be formed.

Transverse end members 12 are formed preferably of metal, so as to have a web portion 13 and depending side Walls 14 and l5 spaced apart. The side walls 15 are of greater' depth than the bars 11, and have formed in their lower edges notches or reccsses 16 of such a shape as to fit the outside of the bars 11, The side walls 15 are also provided with holes 17 for a purpose to be described.

In using the mold, the bars 11 are laid parallel with each other at proper distances apart on the floor, and the transverse end members 12 are placed thereacross so that the notches or recesses 16 fit over the bars 11, and with the ends of the bars 11 contacting with the inside of the walls 15. hen it is desired to have metal reinforcing rods embedded in the concrete, these rods are inserted in the holes 17, the pairs of holes 17 in one of the end members 12 being spaced farther apart than the holes in the other member, so that the reinforcing rods 18 will converge toward each other at one end, thus making it possible to it the projecting ends of these rods in one beam within the projecting ends of the rods of another beam when these beams are laid end to end. The amount to which the ends of the reinforcing rods 18 extend beyond or outside of the concrete can be determined by the distance the walls 14 and 15 are apart. Also, by shifting the end members 12 longitudinally of the bars 11, the extent of projection of the rods 18 can be decreased with a corresponding increase in the length of the con* crete beams. It will be understood that the notches 16 are made of such dimensions and shape that when the end members 12 are pressed down upon the bars 1l, they will be wedged thereon and held by frictional engagement from sliding longitudinally. After the bars 11, transverse end members 12 and the rods 18 have been placed on the tloor as above described, concrete is introduced between the bars 11 and its top surface is smoothed ott' so as to be flush with the top edges of the bars 11, and is permitted to remain until it sets or hardens, after which the end members 12 can be removed, so that the concrete beams can be readily lifted out, or the outside bar 11 can be pushed aside and the successive beams removed sidewise.

In the modification shown in Fig. 6, the holes 17 are omitted from the side walls of the end members 12 and the ends of the reinforcing rods 18 reach merely to the inner Wall 15', thus causing the ends of the reinforcing rods to be Hush with the ends of the concrete beams 19 when the same have been finished.

I claim:

l. A form for molding concrete, which comprises a series of parallel bars and transverse hollow end members having parallel side Walls With recesses in one of said Walls to iit the outside of said bars.

2.'A form for molding concrete, which comprises a series of parallel Wedge shaped bars and transverse end members U-shaped in cross section, each end member having recesses in the side Wall thereof to iit the ontside of said bars.

3. A form for molding concrete,' which comprises a series of parallel bars and transverse end members having recesses to it the outside of said bars, said end members being hollow and having spaced apart walls perpendicular to said bars.

4. A form for molding concrete, which comprises a series of parallel bars and transverse hollow end members having recessesto iit the outside oi said bars and holes between said recesses.

5. A form for molding concrete, which comprises a series of parallel bars and transverse end members having recesses to fit the outside of said bars, said end members having spaced apart walls, one of which is imperforate.

FRED J. MEAD.

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