US115683A - Improvement in elevators - Google Patents

Description

` V. C. BLMR.

Improvement in Elevators.

Patented June 6,1871.

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UNITED vALnNTINn o.. BLAIR, or wnnArLANn, PENNSYLVANIA.

IMPROVEMENT IN ELEVATORS.

To all whom'it may concern:

Beit known that I, VALENTnvE C. BLAIR, of Wheatland, in the county of Mercer and State of Pennsylvania, have invented a new and useful Improvemerdl in Elevators; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying'drawing forming part of this specification, in which- Figure l is a side view of my improved elevator, parts being broken away to show the construction. Fig. 2 is a detail sectional view of the same taken through the line a' m, and

Similar letters of reference indicate corresponding parts.

My invention has for its object to furnish an improved safety attachment for elevators, designed more particularly for the elevators in mine shafts, but equally applicable to elevators in storehouses and other places, and which shall be so constructed as to stop and hold the cage or platform should the hoister rope 0r chain accidentally break; and it consists in` the construction and combination of various parts ,of the apparatus, as hereinafter. more fully described.

A is the frame-work of the cage or platform,

which is provided with guides al a? to keep it in place upon the slides B, upon which it moves up and down. C are levers, which are pivoted to the frame-work of the cage A, one upon each side of each of the slides B, and upon the inner ends of which are formed jaws to clamp the said slides B and hold the said cage suspended. The outer ends of the levers C are bent inward, and are pivoted to the lower ends of the rods or bars D, which pass up through holes in the corners of the upper part of the amawork of the cage A, said holes being made larger than the said bars so that the bars may work freely. The upper ends of the four bars D are pivoted to the ends of the four arms of the bow E, through the center of which the hoisting rope or chain F passes. G are springs which are attached to the frame A of the cage, and which are connected with the outer ends of the levers C by stirrups, links, orkeepers g', and which are so arranged and made of such strength that when the strain upon the bow E is released by the breaking of the hoisting-rope or chain F they will force down the outer ends of the levers G and cause their inner ends to clamp the slides B, the weight of the cage causing the said catch-levers to clamp the said slides more firmly. The lower end of the hoisting rope or chain F is attached to the center of the central cross-bar at the top of the frame A, and is provided with a stop, f', so arranged that when the strain is applied to said hoisting-rope the first eect will be to raise the bow E suiiiciently to withdraw the levers C from the slides B. The strain will then come upon the frameA of the cage. The

levers G will thus be held away from the from such accidents.

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

1. Thelever clamps or catches G, placed one upon each side of each of the slides B, and each provided with a spring, G, or equivalent spring, in combination with the frame work A and slides B of an elevator or hoist ing apparatus, substantially as herein shown anddescribed, and for the purpose set forth.

2. The combination of the lever clamps or catches C, springs G, pivoted bars D, fourarmed bow E, and stopf with each other and with the framework A of the cage or platform, and slides B, substantially as herein shown and described, and for the purpose set forth.

VALENTINE C. BLAIR.

Witnesses DAVID Rrsnn, STEPHEN H. VANNEss.

ATENT IFICE..

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