US132583A - Improvement in adjustable scaffolds - Google Patents

Description

W. AEJYESTM. improvement in Adjustable Scaffolds.

No. 132,583.l Patentedom. 29,1872.

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Vnew and useful Improvement in Adjustable Ferca WILLIAM A. JESTER, OF HOLLIDAYS COVE, WEST VIRGINIA.

IMPROVEMENT iN ADJUSTABLE SCAFFQLDS.

Specification forming part of Letters Patent N o. 32,5S3, dated October ,29, 1872.

To all lwhom t may concern:

Be it known that I, WILLIAM A. JEsrER, of Hollidays Cove, in the county of Hancock and State of West Virginia, have invented a Scaffolds, of which the following is a speciication:

The object of this invention is to furnish safe and convenient means for supporting house-builders and painters with their mate rials and implements by the sidesofbuildings," and it consists in an adjustable scaffold constructed and arranged as hereinafter described.

In the accompanying` drawing, Figure l represents a vertical section of the scaffold, showing one ofthe upright supports with the bracket for the platform and the clamp for fastening the top to the roof, the section being on the line x a: of Fig. 2. Fig. 2 is a front View of the scaffold. i

Similar letters of reference indicate corresponding parts.-

A represents one of the supportingstands, the lower end of which rests upon the ground or on some substantial foundation, and its upper end extends above the eaves of the building or as far as may be necessary. Bis a sliding bracket on the upright A, which is supported by pins O in the uprights, consisting; of three parts-viz., the upright piece D, the horizontal piece E, and the brace F. Gis the platform upon which the workmen stand, which is supported by the bracket B, as represented. In the top of the upright A is a pulley, H. I is a clamp, consisting of two or more jaws at'v tached to the horizontal bar J. This bar is conned to the upright A by a band, K, so that it can slide up and down on A. One jaw, (or pair of jaws,) L, is rigidly fastened to the bar J. The other jaw, (or pair of jaws,) M,

operates `as a lever, and the two are pivoted togcth er at N and act much like a pair of pinchers when the lever end of the jaw .M is raised. O is a rope, connected with the lever end of the jaw M by the strap P. In some cases I have two pairs of jaws for each upright, oneon each side of the bar J, which are connected together by the strap P. This clamp, it will be seen, can be raised or lowered so as to be grappled onto roofs or projections of different heights from the ground. The ropeO passes up over the pulley H, and may be passed around another pulley, and then it is fastened to a pin or staple in the upright A or bracket, as seen in the drawing. The bracket is attached to the upright A by the straps R R, which allow it to slide so that the platform may be placed in any desired position and be adjusted from time to time as the work progresses, there being a series of holes in the upright A fonthis purpose. Two or more of these uprights with bracket and clamp attached are employed in supporting the platform G. S is a piece of timber by which the top ends of the uprights A are connected. l

Having thus described my invention, I claim as new and desire to secure by Letters Patent- l. The upright A, sliding bracket D E F, and sliding clamp J L M, connected, adjusted, and applicable Iin a scaffold for builders, as described.

2. The clamp I, consisting of bar J, ixed jaw L, and movable jaw M, pivoted at N, `as

and for the purpose set forth.

WILLIAM A. J ESTER.

Witnesses WM. BROWN, W. H. HAMMOND.

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