US1819906A - Form for supporting monolithic slabs of cementitious material - Google Patents

Description

1931- H. E. MARKS 1,819,906

FORM FOR SUPPORTING MONOLITHIC SLABS OF CEMENTITIOUS MATERIAL Filed March 3, 1928 V awxzzz azz'aiasaswzzxm III Jig. 5.

WITNESS INVENTOR M W (8. W

Patented Aug. 18, 1931 UNITED STATES PATENT OFFICE HERBERT E. MARKS, OF GLEN OSBORNE, SEWICKLE'Y, PENNSYLVANIA, ASSIGNOR TO UNITED STATES GYPSUM COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS FORM FOR SUPPORTING MONOLITHIC Application filed. March 3,

' tious material, such as gypsum, concrete and the like, until the material sets to form a monolithic slab.

The object of the invention is to provide an inexpensive form which may be easily erected, which when erected effectively, serves its intended purpose, and which after a slab has been set may be easily removed for use in a different location.

In the accompanying drawings, Fig. 1 is a vertical sectional view through a pair of adjacent floor beams or roof purlins and through a form provided according to the invention; Fig. 2 a perspective view of a form-supporting loop; Figs. 3 and 4 views of modifications of the loop of Fig. 2; Figs. 5 and 6 sectional views taken on the lines VV and VIVI, respectively, Fig. 1; and Fig. '17 a perspective view of a modified form of oop.

According to this invention spaced roof purlins or floor beams, hereinafter designated collectively as beams, are engaged by wire strap loops provided with projections which engage bars extending from beam to beam, the bars forming supports for a platform on which cementitious material is poured to form a monolithic slab.

In the illustrative embodiment of the invention there are shown two beams 1 and 2 in the form of channels engaged by wire loops 3, which may be, and preferably are, of the general form illustrated t'o enlarged scale in Fig. 2. The vertically disposed sides of each loop are provided with laterally-extending portions for engaging platformsupporting bars 4 which are preferably provided with openings for receiving such portions. As seen in Fig. 2, the side of loop 3 adjacent to the trough face of beam 1 is bent to form a projection 5 which extends through an opening 6 adjacent to the end of bar 4. The other side of the loop, namely, that adjacent to the back or plane face of the beam may also be provided with a similar projection 5a, the side of the loop being stretched outwardly to engage an opening 7 closer to the end of a bar 8 than the opening 6 in bar SLABS or CEMENTITIOUS MATERIAL 1928. Serial no. 25s,s42.

4. The meeting faces of the portions of the wire loop which form the bar-engaging projections 5 and 5a may be welded together as shown in Fig. 2, or the wire which forms these projections may be twisted together as shown at 11 in Fig. 3, although it will be understood that it is unnecessary to either weld or twist these projections. As a further modification, the loop may be formed of sections of wire, the ends of which are bent outwardly and welded to each other to form a projection 12, as shown in Fig. 4.

While the platform supporting bars may be of any suitable form and construction, each is preferably made of a pair of small flanged sections which may be in the form of channels 4 and 8 arranged back to back for telescopic adjustment as seen particularly in Fig. 6. The channels are rendered rigid in their variably adjusted positions by means of stirrups 14 which are attached to one of the channels, as by bolts 15, and which are so shaped as to conform to the lower flanges of the channels and to engage their webs. By this construction channel 4 may be slipped into stirrups 14 attached to channel 8, and, within the customary variations in spans between beams, may be adjusted to any desired length for forming a platform-supporting bar. This eliminates the necessity of providing adjustable platform bars with holes or slots for receiving bolts or pins for connecting them to form a rigid support, and affords a support having a range of adjustment unlimited by the spacing of holes or the lengths of slots.

In erecting the platform provided according to this invention, the spaced beams are first provided with wire loops arranged at desired intervals. For attaching a loop to a beam, its upper free ends may, as shown in Fig. 1, be bent laterally to engage a ring 16 previously slipped over them, or, if desired, the upper ends of the loops may be twisted together in the manner generally illustrated in Fig. 3. Platform-supporting bars are then arranged between adjacent beams, and the lateral projections 5 and 5a of the wire loops are placed in the openings at the end of the bars. To prevent the bars from slipping off provided where necessary with kerfs or holes 18 to receive the vertical portions of the wire loops. To avoid the necessity oflongitudinally cutting a platform board 17 when the space between adjacent beams is not a multi- 'ple of the widths of boards 17, a flat sheet of metal 22 may be used to span the odd width ga as shown in Fig. 1.

ff the monolithic floor is of the suspension type, tension wires 19 may be deflected at the center of each span by a rod 20 which may be tied downwardly in its wire-deflecting position by wires 21, or equivalent members, extending through the platform and engaging the platform supporting bars 4, 8. Thus there is avoided the necessity of roviding special members arranged below t e beams for tying down the suspension reinforcement. The attachment of the ends of the platform formed with integral laterally-extending portions, and longitudinally adjustable platform-supporting bars extending from one to another of said beams, provided at their ends with openings through which said laterallyextending loop portions project for supporting the bars against downward and upward movements.

2. A form for supporting a monolithic slab of cementitious material, comprising spaced beams, Wire loops enclosing said beams, the ends of said loops being secured together above said beams, integral, laterally extending projections formed on said wire loops intermediate the top and bottom thereof, and platform supporting bars extending from one to another of said beams, and provided at their ends with openings through which said laterally extending projections extend for supporting the bars against downward and upward movements.

In testimony whereof, I sign In name. HERBERT E. ARKS.

supporting bars to the loops is such as to ef- Y fectively resist either an upward pull of the tension reinforcement, or to support the weight of the platform and slab oured upon it. In case a suspension type of floor is not laid upon the latform, or if special means are provided or holding the tension rods downwardly, the lower portions of the loops may be omitted, and in place thereof a. saddle 23 such as shown in Fig. 7 may be used.

With the form thus assembled, a cementitious body of gypsum, concrete or the like, is poured upon the platform to the desired depth and permitted to set. After the slab has set, the form may be lowered by moving the platform bars laterally from their engagement with the wire loop projections, the projections being first cut off or turned to horizontal positions if previously bent otherwise. After the bars 'and platform supported by them are thus removed, the lower portion of the wire loops may beclipped off flush with the lower face of the slab, and the bars and platform used in a different location.

According to the provisions of the atent statutes, I have explained the princip e and operation of my invention, and have illustrated and described several embodiments of it. However, I desire to have it understood that, within the scope of the appended claims, the invention may be practlced by other forms of construction than that specifically illustrated and described.

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