US295678A - Safety-stop for elevators - Google Patents

Description

(No Moclel.)

E. SAUNDERS.

SAFETY STOP FORB LE VATORS.

Patented Mar. 25, 1884.

INVENTOR WITNESSES ATTORNEYS.

N. PETERS, Plmmlithugnpbur. Wuhmglon, D. c.

ELLISON SAUNDERS,

' TENT U OF AUSTIN, TEXAS.

SAFETY-STOP FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 295,678, dated March 25, 1884.

Application filed September 10, 1883. (No model.)

Safety-Stop for Elevators, of which the following is a full, clear, and exact description.

The object of my invention is to provide a new and improved attachment for elevator-cars to stop the descending car immediately in case the elevating-cable breaks.

The invention consists in a lever pivoted to the bottom of the car, and provided with a spring for throwing it into position transversely to the car-bottom, so that the ends of the lever can catch on horizontal bars secured to a the sides of the elevator-shaft. A rope orcable is secured to one end of the lever and to the car-elevating cable, and keeps the spring taut, and prevents it from throwing the lever unless the elevating-cable breaks.

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

Figure l is a longitudinal outside elevation of an elevator-shaft containing an elevator-car provided with my improved attachment. Fig. 2 is a side view of the car. Fig. 3 is a sectional plan View of the shaft and a plan View of the bottom of the car. Fig. 4 is a horizontal sectional view of the elevating-cable,with a part of the safety rope or chain attached.

On two opposite sides of the elevator-shaft a ,series of horizontal bars, B, are securely fastened to the corner-posts G of the shaft,which bars may be made of wood or metal, and can be spaced from about six inches to several feet. The bars B can extend entirely across the sides of the shaft, or can extend to a point slightly beyond the middle of the sides of the shaft, at which point a standard mustbe erected. If

the bars B extend entirely across the sides of the shaft,vertical struts D are placed between the bars at a point a short distance beyond the middle of the shaft. A lever, E, is pivoted to the bottom of the elevator-car A, at or near.

the middle of the san1e,which lever is of such length that it can extend from the outer sides of the bars B on one side of the shaft to the outer sides of the bars B on the opposite side of the shaft, as shown. To one end of the lever E aspring, F, is fastened, which has its opposite end secured to the bottom of the car, which spring can draw the lever E in such a manner that it extends transversely across the bottom of the car, and so that the ends of the said lever project between the bars B. To that end of the lever E opposite the one to which the spring F is fastened a cable, rope, or chain, G, is fastenedgvhich runs over pulleys H and H at the bottom and top edges of the car, which cable G is provided at its upper end with a ring, K, or an eye or pulleyblock, through which the elevator-cable J passes. As long as the cable J is taut, the

cable G is taut and draws the lever E in the inverse direction of that in which it is drawn by the spring F, thus keeping the entire lever E within the limits of the bottom of the car. If the elevating-cable J breaks, the cable G will be slackened, and the spring F can drawthe lever E to extend transversely across the bottom of the car, thus throwing both ends of the lever E between the bars B on the opposite sides of the shaft. The ends of the lever E catch on the bars-and prevent the car from descending. The car is thus prevented from dropping, and serious accidents can thus be prevented. As the ends of the lever E act downward with great force on the bars B at or near the middle, I have provided the struts D to counteract this pressure and prevent the pressure from breaking the bars B. The bottom of the car is provided with studs M, to prevent the lever E from swinging too far in one direction or the other. The abovedescribed device operates instantaneously, and will never fail to check the car in case the elevetting-cable or the machinery for raising the car breaks.

A cord and weight can be used in place of the spring F.

()ther suitable equivalent devices can be i used in place of the bars B. For instance, grooves can be out in the walls of the elevator shaft, or brackets can be provided in place of the bars B.

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

l. The combination,with an elevator-car, of a pivoted lockinglever on its bottom, and of bars or analogous devices on the sides of the elevator-shaft, substantially as herein shown and described.

2. The combination,with an elevator-car, of a lever pivoted to its bottom, a spring acting on the lever and tending to throw it in atransverse position, and a rope or cable secured to the opposite end of the lever, and provided at its upper end with an eye or ring through which the elevating-cablepasses, substantially as herein shown and described.

3. The combination,with an elevator-car, of

" a-lever pivoted to the bottom of the same, a

spring secured to one end of the lever and to the car, a rope secured to the opposite end of ELLISON SAUNDERS.

Witnesses: Osoiin F. GUNZ, O. SEDGWIOK.

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