US725526A - Anchor-box for joists. - Google Patents

Description

, PATE'NTBD' APR. 14, 1903. R; W. WHITEHUR ST. ANCHOR BOX-FOR JO'ISTS.

APPLICATION FILED JAN. 3, 1903.

F0 MODEL.

I I I .[nve nCTar tflttorngys UNITED STATES PATENT OFFICE.

ROBERT'WJ WIIITEHURST, OF NORFOLK, VIRGINIA.

NoHoR-Box FORJOlSTS.

SIECIFIGATION formingpartof Letters Patent No. 725,526, dated April 14, 1903. Application filed January 3, 1903- Serial No. 137,648. (No model.)

- T all whom it may concern;-

Be it known that I, ROBERT W.'WH1TE- HURST, a citizen of the United State's,'residing at Norfolk, in the county of'Norfolk and State of Virginia, have invented certain new and useful Improvements in Anchor-Boxes for Joists and Girders, of which the following is a specification.

This invention relates to improvements in anchor boxes which are embedded in the. brick or stone walls of buildings for the support of the girders and joists and for the protection of the ends of the same from dampness and the ignition that otherwise might result from the proximity of a heating-flue in the wall.

The invention consists of certain constructions, arrangements, and combination of parts hereinafter fully described and claimed, reference being had to the accompanying drawings, in which Figure 1 is a side view of. my improved an-' chor-box in a brick wall and supporting'one' end of a girder or joist. Fig. 2 is a rear perspective view of the anchor-box with the parts separated from each other and in juxtaposi tion. Fig. 3 is a front perspective View of the box with the parts assembled.

My improved anchor-box comprises two separable parts or sectionsnamely, a support A for the girder or joist and a protect ing-cover B. The support A consists of-a horizontal base-plate a, provided atitsrear with an upwardlycxtending flange b and also provided with two transverse barsiofi connecting at their rear with said flange and at the rear forming shoulders o, and said bars having their upper edges inclined downward from said high shoulders to their front ends. The location ofsaid cross-bars o is such as to leave a ledg'e'd at each endof the plate a on the outside of each bar.- Astud e is located between the two cross-bars and pro'-- jects from the upper surface of-thebaseplate, as illustrated in the drawings.

The cover B, be fore mentioned, consists of a box-like structure having atop f, a rear wall g, and two vertical side walls h, whose lower edges h are inclined complementary to the inclined edges of the cross-bars-c, and

the cover is also provided with shoulders 71, which project downward and engage the shoulders c on the cross-bars. The front and bottom of saidcover are open.

In the assembled condition of the anchorbox the cover B rests upon the support A, with the inclined edges h of the cover resting upon the inclined edges c of the crossbars 0, the lower edge g or the rear wall abutting upon the rear flange b, and the downshoulders h abutting against the up-shoulders c. A sidewise movement of the cover B with respect to the support A is prevented by means of a V-shaped tonguel on the rear of one part fitting into a corresponding recess Z on the other part.

In practical use the support A of my improved anchor-box is embedded in a wall, withthe brickwork or stonework built about it and on the two ledges d and about the rear 'flangeb, so that it is firmly anchored in place, and thenthe end of the joist or girderm is ins'erted between the two cross-bars c and rests on thebase-plate a, and said joist or girder is provided with a socket m, which receives the'stud e, soas to secure the joist or girder in place and prevent anylongitudinal movement of -the latter with respect to its support. Thecover B' is then applied over the end of the joistor-girder and on the support, so that the parts ofthe box are assembled as before described, andthe brickwork or stonework of the building-wall is then continued, so as to inclose the top, rear, and two sides of said cover and hold it firmly in place on the support A.

Itis to be especially observed that I have providedatwo-part or sectional anchor-box,

of which'one part is supported on the other in such a manner -that is, by the inclined edges h and c that a forward movement of the is upon the cover B, because any forward movement of the support A or rearward movement of the cover 13 must eifect a raising of said cover, as before explained, and such movement is resisted by the Weight of the upper part of the wall. It is evident that any movement of the support A and cover 13 with respect to each other in a direction opposite to that just described is prevented by the abutting shoulders c and 7t. It is also to be observed that the end m of the girder or joist is beveled on top, as indicated in dotted lines, Fig. 1, so that in the event of fire and the burning of said girder or joist the said end may clear the top of the cover B and tilt out when the girder or joist sags or breaks down, thereby preventing the building-wall from being pulled down with it.

It is obvious that the upwardly-extending flange I) need not extend outwardly beyond the transverse bars 0', and it is to be understood that the ledges cl may be dispensed with, if desired.

I-Iaviug thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. An anchor-box for the support of the end of a joist or girder, comprising a basesupport provided with means for engagement with the end of a girder or the like; and a cover resting on said support, abut-ting edges of the support and cover being correspondingly inclined, whereby a relative forwardand-backward movement between the support and cover will raise the latter.

2. An anchor-box, comprising a base-support provided with cross-bars whose upper edges are inclined; and a cover adapted to rest on said cross-bars, whereby a relative f0rward-and-backward movement between the support and cover will raise the latter.

3. An anchor-box for the purpose described, comprising a support provided with means for engagement with the end of a girder or the like and also provided with two crossbars whose upper edges are inclined; and an open front cover adapted to rest on said cross-bars, the lowerside edges of said cover being inclined correspondingly to said crossbars.

4. Au anchor-box for the purpose described, comprising a base support provided with means for engagement with the end of agirder or the like and also provided with a rear upwardly-extending flange and two cross-bars which project at the rear above said flange whereby to form shoulders, and whose upper edges incline downwardly from the rear to the front; and an open-front cover adapted to rest on said cross-bars, the lower side edges of said cover being inclined correspondingly to said bars, and said cover being provided with shoulders adapted to engage the shoulders of said bars whereby to prevent a forward movement of the cover on the bars.

5. An anchor-box comprising a support provided with means for engagement with the end-of a girder or the like, a rear upwardly-extending flange having a recess, and two cross-bars whose upper edges are inclined and which project at the rear above said flange whereby to form shoulders; and an open-front cover adapted to rest on said crossbars, the lowerside edges of said cover being inclined correspondingly to said cross-bars, and said cover being provided with shoulders adapted to engage the shoulders of said .bars and also provided with a tongue adapted to enter the recess of said flange whereby to prevent the sidewise movement of the cover on the support.

In testimony whereof I affix my signature in the presence of two witnesses.

ROBERT W. WIIITEHURST.

Witnesses:

J. Rov COLLINS, J. STANLEY TRICE.

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