US1821969A - Form hanger - Google Patents

Description

Sept; 8, 1931. G E, GREENWOOD 1,821,969

FORM HANGER Filed Jan. 50, 1929 Patented Sept. 8, 1931 UNITED STATES GEORGE E. GREENWOOD, OF SAN FRANCISCO, CALIFORNIA FORM HANGER Application filed January 30, 1929. Serial No. 336,097.

My invention relates particularly to forms useful in building concretestructures and which are especially adapted for the encasement of structural beams such as I-beams,

for sheathing them in concrete. Devices of this characterare disclosed in my copending application entitled Concrete form hanger; filed August 21, 1928, and bearing Serial Number 301,033.

It is an object of my invention to provide a form hanger'which is adjustable for use with a wide range of sizes of beams such as are employed commercially in the construction of buildings.

Another object of my invention is to provide a form hanger which may be applied with a standard width of form bottom to encase beams of varying width.

Another object of my invention is to 0b 29 viate inaccuracies in the dimensions of the finished concrete sheath.

An additional object of my invention is to provide a form hanger which is easily removable after the concrete has been poured.

Another object of my invention is to provide a form hanger which can be used re-- peatedly for a number of different sized beams.

The foregoing and other objects are attained in the embodiment of the invention shown in the drawings, in which i Fig. 1 is a cross section on a transverse plane of an I-beam to which the form hanger of my invention has been applied.

Fig. 2 is a perspective view oft-he form hanger shown in the Figure 1 with portions thereof broken away.

Fig. 3 is a transverse section showing a portion of my form hanger having modified details.

Fig. 4 is a transverse section in perspective of an additionally modified form of my invention.

In its preferred form, the hanger of my invention comprises a spacer adapted to be adjustably secured to a beam and to which in turn is adjustably secured a form bottom, the spacer having the functions of properly positioning the form bottom and of properly positioning the form sides as well.

in the modification of my invention disclosed in Fig. 1, there is shown a beam 6 which is of the shape commercially known as an I-beam and which is to be encased, or sheathed in concrete. In different structures, vanous different shapes of beams are employed and also beams of the same gen-. eral cross section but with varying flange thicknesses and web thicknesses. It is to be enabled to employ a form hanger without material change with any'of the beam sizes and shapes that are apt to be encountered in commercial practice that I provide the structure shown. This preferably comprises a pair of spacers 7 disposed on either side of the beam and contacting the lower face of the lower flanges thereof. As shown in Figs. 1 and 2, these faces are easily made by severing them from channels or other suitable structural shapes which have the requishe ri idity on the web and flanges thereof. For positioning the spacers 7, I preferably provide a hooked bolt 8 passing thru an aperture in the upper flange of the channel and having a threaded end to which a nut 9 is secured for clamping the spacers 7 tightly against the flange of the beam 6. By virtue cf this variable connection fixture, it is easily pos ible to secure tightly the spacers T to anyone of a number of beams having various flange thicknesses with only the necessity of adjustingthe nut 9. As the nut 9 is tightened the spacers 7, which are capable of rotative movement about the axis of the bolt are usually turned in the direction of rotation of the nut. Inasmuch as the spacers are ordinarily severed from a channel on a transverse plane normal to the longitudinal edges of the'channel the distance between the edge of the lower flange of the beam 6 to the corner of the spacer is apt to vary. In some instances the corner ofthe spacer will be brought into direct contact with the forms surrounding the beam which may result in the misali nment ofthe form or ofthe bean. This is an undesirable result and in my prior application I show a incl-us for positively holding the spacer 7 in proper relationship. In the present instance,zl preferably round or cut in an arcur obviate the use OI securing nuts.

ate manner the end of the spacer 7 and thus thru any of the usual. pivotal positions, the distance between the edge of the beam flange and of an extreme part of the spacer is exactly the same.

Held at a predetermined distance from the beam by means of the spacers '7 is a form bottom- 11 which preferably is of sufficient width for a range of difierent size beams and which preferably is reinforced by a cross member 12 having a pair of longitudinally extending bolt slots 13 therein. For securing the form bottom 11 adjustably to-the spacer and thereby positioning, it in a predetermined manner with respect to the beam 6, bolts 1; are preferably inserted thru the slots 13 and extend thru the lower flanges of the spacers T and terminate within the chan nel portions thereof. Preferably the terminal ends of the bolts are threaded to receive nuts 16 which are capable of adjustment for properly relating the various parts. Supported by the form bottom 11 and relatively located by the spacers 7 are form sides 1'? which are held against the spacers by strips 1.8 nailed. in place and are properlyseparated atthe upper ends by a cross member 19 also nailed in place.

In. the form of my invention shown in Figure 3, 1 preferably provide spacers 21 which are inmost respects similar to the spacers 7 shown in Figure 1 but are relatively thick and are-tapped in their apertures for receiving the fastenin bolts 22 and 23 so as to By simply rotating the-hooked bolt 22 and the fastening bolt 23, a suitable adjustment of the spacers 21 with respect to the beam 26 is provided and also a suitable adjustment of the form bottom 27. with respect to the spacer 21 is provided. In other respects, the modification is substantially as shown in Figure 1.

In Figure 4 is shown an additional modification in that the spacers themselves are of slightly different construction although the remainder of the organization is identical. In. this instance, spacers-30 instead of being made of commercial shapes such as channels are preferably formed fromflat strips sevthe beam encased in concrete. WVhen the concrete has set, the form sides are removed and the form bottom is likewise detached from the spacers which are left in place. It is not necessary, as has been the case with previous devices to clip or shear off projecting bolts,.but in this instance the fastening bolts need simply to be unscrewed and they can then be readily removed from the concrete encasement along with the forms. Not only (lo-the partsremaining in the concrete form a suitable point of attachment for subsequent structures but they also render the removal of the formsthemselves quite simple.

I claim:

A form hanger for use with any one of a plurality of different beams comprising a form, bottom, a. spacer interposed between said: form bottomand any selected one of said beams, hooked bolt engaging said selected one of said beams and piercing said spacer, means within the confines of said spacer for clamping saidispacer and said bolt on said,

selected one of said beams, and means for clamping. together said spacer and said form bottom.

In testimony whereof, Ihave hereunto set my hand GEORGE E. GREENWOOD.

ered along arcuate lines 31 and bent upon.

themselves to enclose a central channel 32.. These spacers 21 receive within their channel portions the adjustable fastenings 33: and. 34: which secure the hook bolt 36 and the fastening' bolt 37 to the form bottom 38 and the beam 39-.

lVith any of the modifications of my invention, the form bottom 11 is preferably assembled with the spacers into a single unit which hoisted into position below the beam whereupon the hook bolts are put in place and are fastened; It will be appreciated that any width beam will be accommodated by this construction and that after the form bottom is in place the form sides can be installed and

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