US174871A - Improvement in elevators - Google Patents

Description

J. B. s WEEr'rLANn.

ELEVATOR.

, N,174,871. Patented Marh141fe7e.

WITNESSES @JAM B UNITED S'IAJrrizs JEROME B. SWEEIL'AND,

"PATENT OFFICE.

OF PONTIAC, MICHIGAN.

IMPROVEIMENT IN ELEVATORS.

Specication forming part of Letters Patent No. 174,87 l, dated March 14,- 1876; application filed February 2l, 1.876.

To all whom it may concern:

Be it known that I, J. B. SwEnTLAND, of Pontiac, in the county of Oakland, and in the State of Michigamhave invented certain new and useful Improvements in Elevators and do hereby declare that the following is a full, clear, and eXact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, making a part of this specification.

The nature of my invention consists in the construction and arrangement of an elevator for carrying up building material while erecting a building, as will be hereinafter more fully set forth.

In order to enable others skilled intheart to which my invention appertains to make and use the same, 1 will now proceed to describe its construction and operation, referring to the annexed drawing, in which- Figure l is a perspective view of my elevator. Fig. 2 is a detailed view of the clamp for holding the hoisting-rope on the platformframe.

The frame of my elevator is composed of a horizontal beam, A, t'wo.- upright end beams, B B, and one upright center bar, C, said uprights forming guides or ways for the platforms. The end guides B pass up through mortises in the ends of the horizontal beam A, while the center upright or guide C passes through a loop, D, on one side of the beam A. If this center guide were set in line with the end guides it would have to be hollow, so as to let the rope pass down through it the whole length, which would be a great deal of trouble both to make and to set up 5 but by placing said center upright or guide to one side the rope is free and clear from top to bottom. The beam A is held to the uprights B B and C, by means of pins @passing through them; and the uprights are intended to project above said horizontal beam a suitable, dist-ance, so that when the walls of a brick building are laid high enough so that a scaffold is necessary, the three pins may betaken out of the beam, and the beam raised up4 high enough so that the platforms can come level with the scaffold, and Wheelbarrows may be run oi' and on on a level, the beam A being thus adjustable to any height required. The

frame thus constructed is held by means of one truss at each end, each truss consisting of an inwardly-beveled sill, ,E, and two inclined braces, G G, secured at their upper ends to 'the end guide B. These trusses lanswera threefold purpose. They brace the elevator sidewise and end wise, and the upper ends ofthe braces G form shoulders, upon which the beam A is supported. On top of the horizontal beam A, in suitable frames, are mounted pulleys H H, over which the hoisting-rope b passes, the ends of said rope passing through holes in the beam, and are attached to the frames I', supporting the platforms J, by means of clamps as hereinafter described. The frames I are provided with suitable side guides, d, which straddle the edges of the guides B and C of the frame. K represents an L- shaped lever, pivoted at its angle to one of the upper corners of the horizontal beam A, the upper horizontal arm of said lever having asprin g, e, placed underneath, as shown. On the lower end of the vertical arm of the lever K is formed a hook, f, which catches on the upper bar of the platform-frame I, for holding or lookin g said platform in position. When the lever is pulled down to release the platform the spring e is compressed. The clamp for holding the hoisting-rope b to the platform frame I consists of an L- shaped plate, L, fastened to the top bar of the frame on the top and front. From the lower edge of this plate a half-circle, h, extends under said bar. The ropepasses down through a hole in the top barof the frame, around the half-circle h and up the front face of the plate L, and the end turned down again, and then fastened by a separate plate, M, bolted thereon. The plates L and M and circle la have grooves for the passage ofthe rope, as shown. The. circle h is for the purpose of preventing the rope turning any sharp corners before it is clamped, which would wear it through. On top of the platform-frame I are hed-racks N, which may be adjusted by bolts up Iand down t suit the height of the men. Thehoistingrope b passes around sheaves k k in a jack, O,

at the foot of the center guide C, and the ropepasses around the horse-jack P, which is pivoted on a bedplate,R, and adjusted by means of a set screw, m, to take up the slack in the rope or cable. In practice the horse-jack I will be on the lower oor, and the trusses secured on the joist-s or braces for the door above. It will be seen that two platforms are used, one going up while the other is ging down. On the under sideofthe adjustable top beam A is a bumper, p, of rubber or other suitable material, to take ol the jar or concussion of the platform-frame as it strikes said beam in ascending.

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

1. In an elevator-frame, the combination of the horizontal adjustable beam A, the vertical end guides B B, passing through said beam, and the vert-ical center guide C, passing through a loop, D, on one side of the beam, substantially as and for the purposes herein set forth. -l Y 2. The combination of the beveled bars E` E, braces G G, vertical end guides 'B B, and the horizontal adjustable beam A, all constructed substantially as and for the purposes herein set forth.

3.` The combination, with the beam A, of the angularvlever K, pivoted to a plate or casting `ring-rope 1) pulleys H H, jack O, with pulleys k 7c, and adjustable horse-jack P, with sets'c'rew m, substantially as and for the purposes herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 21st day of January, 1876.

.'TEROME B. sWEETLAND.

lVlitnesses':

J. IEN EYCK, l FRANcIsM. WHEELER.

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