US290487A - Scaffold-support - Google Patents

Description

(No Model.)

T. J. SHAUGHNESSY.

SGAFFOLD SUPPORT. No. 290,487.-

' l Patented Dec; 18, 1883. 75 i WITNESSES-5 ATTORNEY UNHTE STATES A'rnlwr tries.

SCAFFOLD-SUPPORT.

SPECIFICATION forming part of Letters Patent No. 290,487, dated December 18, 1883.

Application filed October}, 1888. (No model.)

To aZZ whom, it may concern:

Be it known that I, THOMAS J. Snauern N'EssY, a citizen of the United States, residing at Marshall, in the county of Saline and State of Missouri, have invented certain new and useful Improvements in Scaffold-Sup ports; and I do declare the following to bea full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being bad tothe accompanying drawings, and to the letters and ures of reference marked thereon, which form a part of this specification.

This invention relates to improvements upon that class of adjustable scaffolds in use by plasterers, painters, and interior decorators, the object being to produce an apparatus which, while retaining its portable character, is readily adjusted to differentheights, so that the user may be brought into the most desirable position inrelation to the work upon which he is engaged.

The invention may be said to consist, essentially, in the constructions of a series of tripods, the legs of which are adjustable, so that they can be spread apart or brought nearer together, thus raising or lowering the apex of the tripod, which supports suitable bearers, upon which the scaffold-boards are laid, the whole being constructed and ar ranged as hereinafter described, with the points of the invention specifically stated in the claims.

In the accompanying drawings, in which similar letters indicate like parts in the several figures, Figure l is a perspective View of a pair of the tripods with the bearer or supporting-beam placed upon them. Fig. 2 is a side view of one of the tripods. Fig. 3 is an end View of the same, and Fig. 4. shows one of the tie-bars and the manner of its connection to the cross-bar of the tripod.

The tripods, which form the principal part of this invention, are each composed of two legs, A A, of equal length, united and held at a certain distance from each other by the crossbar B, which is firmly secured by bolts or otherwise at either end to one of the legs A. The upper ends of these legs are beveled and separated from each other sufliciently to receive between them the movable leg 0, which forms the third leg of the tripod, and swings freely upon a bolt, a, pass ing through all three legs at a point near the upper ends of the legs A. The leg 0 extends upward beyond this pivotal point, and is bifurcated, forming a seat for the reception of one end of the bearer D, the jaws of this bifurcation fitting snugly against the sides of the bearer and retaining it in its position without other fastening.

In order to retain the legs of the tripod in any desired position, and thereby control the height of the scaffold, a tie-bar, E, is employed, which is connected to the cross-bar B at one end by any suit-able swivel-joint, and also to the leg 6 by means of a bolt, 1), passing through the leg and through one of aseries of holes formed in the bar E. It will be apparent that as the legs A A and G of the tripod are brought nearer together the bifurcated end of the leg 0 will be elevated, consequently causing the bearers D, and the scaffold supported leg 0 of the tripod from the legs A A, the whole forming a reliable and easily-adjusted scaffold-support for the purposes named.

I am aware that adjustable scaffold-supports are not new, and that they have been formed as tripods, two of the legs of which, extending above the others, formed side supports to the bearers, the legs of said tripods being made longitudinally extensible in order to raise or lower the bearers, as in the patent to J. Gorman, J une 13, 1882, No. 259,530, andI do not therefore claim this construction. My scaffold supports differ from this, in the bearer being held between the bifurcated jaws at the upper end of one of the legs, and the raising andlowering of the apex of the tripod being accomplished by narrowing or spreading its base.

Havingthus described my invention, I claim as new, and desire to cover by Letters Patent of the United States, the following:

1. As an improvement inscaffold-supports, the combination of the bifurcated leg 0, legs A A, cross-bar B, and adjustable tie-barE, all arranged for joint operation in the manner shown and described.

2. The combination, in. a scaffold-support,

by them, to occupy ahigher or lower post tion, corresponding with the distance of the of tripods constructed and operating {LS de- In testimony whereof I affiX my signature in scribed, each having abifurcated leg, 0, legs presence of two Witnesses. A A, hinged to leg 0 at their upper ends, and

connected near the bottom by cross-barB and THOMAS SHAUGHNESSY' 5 extension-bar E, the Whole carrying a bearer, WVitnesses:

D, to support the scaffold-boards, snbstan- DAN F. BELL,

tially as set forth. I HIRAM FERRIL.

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