US1735590A - Bridging for joists - Google Patents

Description

Nav. 12, 1929. w. E. wHrrE 1,735,590

BRIDGING FOR JOISTS Filed Dec. 5. 1928 CERTIFICATE OF CORRECTION.

Pawn No. 1,135.5am.v Granted November l2. 1929, o

WILLIAM E; WHITE:

lt is hareby certified that error appears in the nhoye numbered patent requiring correction asfollows: The present drawing should be canceled and the drawing containing two figures as shown below should be inserted therfor ls plrt ul the Letters Patent;

Nov, 12, 1929, y 1,735,590

v w. E. WHITE Filed Dec. 5. 1928 ,1 "wird of the casa in the Paten! Office' rrectlon therein that ille same muy conform to the i Signed and sealed thisoth day of December, A. D. 1929.

and that the said Letters Patent should ha read with this co hi. 5. Moore,

Acfino Cnmmiuinnu ..5 mu-.-

l Patented Nov. 12, 1929 and yand flanges UNITED sTATEs PATENT OFFICE WILLIAM E. WHITE, OF CHICAGO, ILLINOIS, ASSIGNOR TO KALMLAN STEEL COMP-ANY,

or carcasa, rumors, a CORPORATION or DELAWARE namento ron. :rozs'rs Application led December 5, 1928. Serial No. 323,898.

My invention relates to bridging for joists beams and particularly to an improvement on the construction shown inmy pending applications Ser. No. 312,324 filed October 13, 1928, Serial No. 323,897, filed December 5, 1928, and Ser. No. 328,898, filed December 28, 1928.

An object of the present construction is to provide a combined bridging unit in which a single element absorbs both tension and compression stresses. An element that will absorb the compression stresses ymust lof necessity be rigid and not easily bent, and such an element does not, therefore, readily adapt itself to attachment to the joists. I have com bined with the compression strut, an attaching clip composed of a different type of element, preferably one constructed of heavy wire having some resiliency.

The clip element is preferably arranged to be readily attached to the strut in the field, in order that the struts packed and-shipped separately. V

The construction also includes numerous other features of importance which will be described in connection with the accompanying explanation.

The invention will be more readily understood by reference to the accompanying drawings, in which Fig. 1 is a side elevation, withthe beams in section, of an assembly such as contemplated by me; and c l Fig. 2 is a perspective view-of a unit, two

of which are employed in the assembly.

I have shown two beams or joists A-B which may be part of a series used for supporting a floor. These may consist of ordinary rolled flanged shapes or of trussed shapes. I

The bridgingof -my invention comprises a pair of combined units arranged .in d lagonally disposed relation as shown `1n F1g. 41, one of said units being now described in detail.

The compression strut is a rigid member. preferably of channel form havin a web 10 11. At both ends t e web is :notched as at 12-13, the notches being shaped In the drawings 'to permit engagement with the 'flanges ofthe and clips may be Y flangel width, the dimensions will be such respective beams A-B. The web of the strut 1s provided with relatively large apertures 14-15 located on the center line at a point directly in the rear of the bottom ofthe notches 12--13. These struts will be constructed in the shop and the length will be exactly that re uired to span the diagonal space between t e upper flange of one joist and the lower flange of properly spaced ad? ]acent joists. l

If the channel is of uniform section, the neutral axis olf-center of gravity of the section is at the center 'and the inner edge of the notch terminates at this point; thusthe .compression load is applied concentrically. Likewise, the punched holes for the reception ofthe hooks are located at the center and this location insures concentric application of the tension stresses.

As an attaching means, I provide clips preferably composed of heavy wire and cornprising a length of material bent into U shape, the legs 16-17 being slightly fiared and terminating in the hooks 18-19 adapted to engage over the flanges of the joist. To facili# tate engagement, the terminal portions 20--21 of the hooks are rebent to rovide an inclined surface that will engage t e edge of the flan e.

The c ips are so constructed that they may readily be causedto engage with the vapertures in the struts by a simple movement, the final position being that shown in the draw. ings. The clips being designed for a specific that a thoroughly firm and rigid connection will result.

The application' of the .bridging element is made by applying the clips in position on the strut, then engaging the clip on the lower endof the strut with the flange of the joist with the strut in the position shown in dotted lines. in Fig. 1. With the arts properly designed, the connection wil-l' e fairly rigid with Athe l parts in that position. Thereafter the oper ator will swing the free end of the strut laterally to avoid interference with the joistB and will then forcibly lift: it to a point-where the notch 12 is opposite the edge of the up' r fiange of. the strut B. He Awill 'ithen swing? 10%;

tion against removalvwithout distortion of the clip. A The operation of oscillating the strut from the dotted line to the full line position will place the clip at the lower end under eX-V treme tension and avoid any ossible looseness. The flare ofthe legs of) the clip provide for slight inaccuracies in dimensions; a slight initial bow in the wire of the legs l6-17 may also be utilixzed to compensate for such variations.

In cases where accidental spacings of the joists occur, variations are necessary only in.

the length of the struts and this is accomplished by providing Aa quantlty of extralength struts notched and apertured at one end and plain at the opposite end. A simple hand-operated tool may be used for cutting off, notching and aperturing the oppos1te end to the required length. t

Bridging elements such as described ma be very simply and economically installe They consist of a minimum number of parts and combine the functions of a more intricate system in a simple and economical manner.

Variations in the form and arrangement of the arts may be made without departure from tlie spirit of my invention, and I do not wish to be limited except as indicated in the appended claims.

I claim:

1. In bridging for spaced joists, the combination 'of an inherently rigid strut adapted to extend between the flanges of said joists, and separate hooks attached to the ends of the strut and adapted to engage over the lsaid flanges. i

2. In'bridging for beams, the combination or" a rigid strut, and hooks hingedly connected to the ends of the strut. 3. In bridging for beams, the combination of a rigid strut, of angular cross section, and hooks hingedly connected to the ends of the strut. v

4. In bridging for beams, the combination vof a rigid strut, and wire hooks connected tothe ends of the strut.

5. In bridging for beams, the combination of a rigid strut and wire members connected to "the ends of the strut, and adapted to be fastened around the flanges of the beams.

6. In bridging for beams, the combination of a rigid strut having notched ends, and wires connected to the ends and adapted to serve as means of attachment of the struts to said beams. v

7. In bridging for flanged joists, the combination of a strut having notches in its ends adapted yto engage flanges of said joists, and wire hooks connected to-said strut and adapted to connect the strut to said joists".

8. In combination, a rigid strut4 havin notches in its ends, said notches being adapte to engage the`l edges of the flanges of joists, and means hingedly connected to the ends of the strut adapted to engage over the joist flanges to provide a tension connection between adjacent joists.

9. In combination, a rigid strut having notches in its ends, said notches being adapted to engage the edges of the flanges of joists, and hooks hinged to the ends of the struts and adapted to engage over the joist flanges.

10. The combination with a pair. of joists of a rigid strut the ends ofwhich are in abutting engagement with the flanges of said j oists to resist compression stresses, and hooks hinged to the ends of the struts and engaging.

over the joist flanges and adapted to receive tension stresses and transmit the same to said struts. i

11. The combination with a pair of joists of a rigid strut, means for connecting said strut to the chord of one joist with capacity to receive and transmit compression and tension stresses, the opposite end of said strut having abutting engagement with a flange of an adjacent joist, and a wire hook pivotally mounted at said opposite end with capacity for snap-on engagement with the opposite edge of the joist flange that is engaged by the abutting end of the strut.

12. In combination, a rigid strut the ends of which are adapted for abutting engagement with the inside edges of the flanges of adjacent spaced joists, 'and wire hooks hingedly connected to the ends of said strut, said hooks being adapted for snap-on engagement with the outside edges of the said joist flanges.-

13. In' combination, a rigid strut having a flange and web, the end of the web having a notch the inner end of which terminates at substantially the neutral axis of the section ofl the strut, and a hook having a pivotal connection with the strut at substantially the neutral axis of the section.

In testimony whereof I have aflixed my signature. WILLIAM E. WHITE.

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