US264577A - Smith - Google Patents

Description

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Q I SOAFFOLD. 7 N0. 264,577, Patented Sept. 19, 1882.

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UNITED STATES PATENT @FFIQE.

'enonon W. SMITH, or HARLANSBURG, PENNSYLYANlA, ASSIGNOR T HIMSELF AND JOHN G. DEAN, OF SAME PLACE.

SCAFFOLD.

SPECIFICATION forming part of Letters Patent No. 264,577, dated September 19, 1882. Application filed April 18, 1882. (N 0 model.)

To all whom it may concern:

Be it known that I, GEOR E WASHINGTON SMITH, of Harlansburg, in the county of Lawrence and State of Pennsylvania, have invented a new and Improved Scaffold, of which the following is a full, clear, and exact description. 1

This invention relates to. improvements in scaffolds; and it consists in the'combination and arrangement of parts substantially as hereinafter more fully set forth.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in both the figures.

Figure 1 is a perspective view of my invention, and Fig. 2 isa transverse verticalsection of the same.

A are posts, provided at their upper ends with V-shaped arms or braces to, which support the posts against a wall, B. These arms or braces are provided with keepers or frames ta which slide upon the upper portions of the posts A, and are secured at any desired height thereon by set-screws a O are posts or bars, having near their lower ends links or keepers c, which slide upon the posts A and serve to hold the posts 0 thereto. The said links are provided withfriction-rollers c on the innerside of the posts A, to cause them to slide easier upon said posts A. The posts 0 are also provided with pawls or levers c pivoted to said posts by pins 0 and engaging with sockets d in the posts A, and being provided with cords c for raising and disengaging said pawls from said sockets.

H are horizontal arms or bars secured tothe posts G and braced and supported by braces h. The said arms H are provided with keepers 0, similar to those on the lower ends of the This shaft has ratchet,

The operation of myinvention is as follows:

To raise the scaffold the shaftE is revolved bymeans of the levers G, thus winding up the rope F, which, pass ng under the pulleys c raisesthe posts 0 and platform D. As it is raised the pawls e and ratchet-wheels c prevent itfrom again descending until they are disengaged, and it is also prevented from descending by the pawls or catches 0. When it is desired to lower the platform the catch 0 is released by pulling the cord 0 and the pawls e are released. and the rope F allowed to unwind from the shaft E.

If it is desired to have one end of the platform higher than the other, it can be done either by adjusting one of the V-shaped arms raised higherat one end than the other, or it may be kept perfectly level.

Third, it is easier to raise than the scaffolds formerly in use.

Fourth, the posts are inclined from a vertical line toward the wall about half an inch to the foot, and the scaffold is thus prevented from falling outward.

Fifth, the apparatus may be used for various purposes.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- In a scaffold, the combination, with the upright or slightly-inclined posts A, having adj ustable forked braces a, provided withhooks a or means 'of attachment for the platformhoisting ropes thereto, of the platform I), the sliding uprights 0,11aviug the horizontal bars H fitted to move upon the posts A, the handled shaft or drum E, having passed through it the platform-hoisting rope F, passing in contact with pulleys a, hung upon the up rights 0, said rope having its ends secured to the hooks a of the braces a, the levers c pivoted to the sliding uprights O and hearing in sockets in the posts A, and cords 0, connect- 10 ed to the outer ends of said lever and passed over the platform 1), substantially as set forth.

GEORGE WASHINGTON SMITH. \Vitnesses:

ALEX. RICHARDSON, JOHN PARKER.

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