US377537A - Safety - Google Patents

Description

(No Model.)

A. STIGLER.'

SAFETY APPLIANCE FOB, ELEVATORS.

N0. 377,537. Patented Feb. 7, 1888. V

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NITED STATES PATENT QFFICE.

AUGUSTO STIGLER, or MILAN, ITALY.

SAFETY APPLIANCE FOR ELEVATORS.

SPECIFICATION-forming part a Letters Patent No. 377,537, dated February 7, 1888,

Application filed August 1, 1887. Serial No. 245,842. (No model.) Patented in Italy November 6, 1886.

To aZZ whom it may concern:

Be it known that I, AUGUSTO STIGLER, a subject of the King of Italy, residing at the city of Milan, Italy, have invented a new and useful Improvement in Safety Apparatus for, Elevators or Lifts, of which the following is a.

full, clear, and exact description.

My lnvention relates to elevators or lifts; and its object is to provide the same with an appliance by means of which, when theelevator-cage descends too rapidly or the attendant loses control thereof, said cage may be antomatically retarded or stopped, thus preventlng danger of injury to its occupants.

The invention consists in the construction and arrangement of parts of the safety apparatus, hereinafter particularly described and claimed.

Reference is to be had to the accompanying drawlngs, forming a part of this specification, in which similar letters of reference indicate corresponding parts in the several views.

Figure l is a plan view of the bottom of an elevator-cage provided with my improved safety apparatus. Fig. 2 is a side elevation of the same; and Fig. 3 is a detail view of one of the guides, illustrating the action of the stop-wedges.

The frame of the floor of the elevator-cage A, composed of the side beams, a, and end beams, a, work between two vertical posts, I), in the usual manner. To the outer faces of the end beams, a, are bolted metal guides b, which project outward at each side of the posts .1), providing an opening, bi for the passage of said posts, which opening is wider at its bottom than at its top, and leaving a space between the sides of said posts and the projections on the guides to receive wedges,to which reference is hereinafter made.

Rectangular wings c, strengthened by suitable cross-pieces and having stretched thereover a thin fabric capable of offering resistance to the air, are pivoted attheir outer corners to and beneath the elevator-cage at c, and are each provided at the center of their outer side pieces with a hook lever or arm, d.

To each of two hangers, e, bolted beneath the center of the end beams, a, are fulcrumed two parallel levers, f, carrying between their inner ends weights 9, each of which weights has formed upon it a hook, 9, adapted to engage the hook-levers d of the wings a. The outer ends of said levers f are connected by short links f with the lower ends of wedges h,which are adapted to slide vertically in the space intervening the sides of the posts b and the guides b, one wedge at each side of said posts.

About centrally beneath the floor of the cage is fulcrumed at i a lever, i, carrying upon its long arm a weight, is, adapted to be adjusted upon said arm to partially balance the weight of the wings 0, said lever being provided at its outer end with an integral cross-piece, i adapted to support the inner sides of the wings c, as shown in Fig. 1 of the drawings. Said lever may, if desired, be positioned as shown in Fig. 2 of the drawings-that is, fulcrumed to one of the side beams, a, slightly off the center of the floor of the cage.

When the elevator-cage is working properly, the wedges h are out of contact with the posts b and guides 12. 7 any cause, the speed of descent of the cage exceeds its ordinary and proper limit, the resistance of the air acting against the under side of the Wings 0 causes them to move upward, turning upon their pivotal points toward the floor of the cage. This upward movementof said wings carries their hook-arms at out of engagement with the hooks g of the weights g, permitting said weights and their levers f to drop. As the weights fall the outer ends of the levers f carry-the wedges h upward in the openings in the guides 22 and force them against, the sides of the posts I) and said openings, thereby causing a reduction of the speed of the cage or stopping its descent altogether.

The weights 9 may be rendered more prompt in their action by means of springs Z, arranged under the floor of the cage, so as to exert a downward pressure on the weights, as shown in Fig. 2 of the drawings, or so arranged as to exert their pressure upon the levers which carry the weights.

The apparatus is readily arranged for operation again by forcing down the wedges and again engaging the hooks of the levers d with the hooks of the weigh-ts 9, when the wings will assume their former position, upheld at their inner sides by the cross-piece of the lever 2 When, however, from Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. A safety appliance for elevators, consisting of wings pivoted at their outer sides beneath the floor of the cage and provided with.

hook-levers on their outer sides, levers pivoted beneath the end beams of the floor of the cage, carrying weights having hooks formed thereon adapted to engage with the hooks carried by the wings, wedges linked to the outer ends of the weighted levers and adapted to enter guides fixed to the outer sides of the floor of the cage, and a weighted lever fulcrumed beneath the cage and supporting the inner sides of said wings, substantially as shown and described.

2. The combination, with the cage A, having the guides 12 fixed to the outer sides of its floor, of the wings c, pivoted beneath the floor of the cage and supported at their inner sides by the cross-piece of a weighted lever, i, and provided on their outer sides with hooks d, levers f, pivoted beneath the end beams of the cage, carrying at their inner ends weights 9, provided with books 9, and having their outer ends linked to wedges h, adapted to enter the guides on said cage between the same and the guide-posts b, substantially as described and shown, and for the-purpose herein set forth.

3. A safety clutch or attachment for lifts or hoists, consisting of balanced wings beneath the cage, preferably formed of frames covered with a fabric ofiering resistance to the air, said wings provided with hooks adapted to engage opposing books on weighted levers pivoted beneath the cage, and connected to wedges fitted to slide vertically between guides carried by the cage and the sides of the guideposts in the elevator-shaft, whereby when the descending speed of the cage exceeds its normal limit said wings are caused to rise, thereby releasing the hooks of the weights from the hooks carried by the wings, which weights cause their levers to force the wedges upward and jam them between the guides and posts and arrest the descent of the cage, as herein set forth.

The foregoing specification of my new safety apparatus for elevators or lifts signed by me.

AUGUSTO STIGLER. Witnesses:

Fos. SPREAFICO, CASATI GAETONO.

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