US313451A - Automatic elevator-brake - Google Patents

Description

(No Model.)

OLK. ROGERS.

' AUTOMATIC ELEVATOR BRAKE.

No. 313,451. Patented Mar. 3, 1885.

WITNESSES- l I I I FT 1 YQQEGAM,

N. PETERS Fhnlolfllvognphar. Washington D C,

UNirn STATES Arena tries.

COLUMBUS K. ROGERS, OF SALEM, MASSACHUSETTS.

AUTOMATIC ELEVATOR=BRAKE.

SPECIFICATION forming part of Letters Patent No.313A51, dated lVIarch 3, 1885.

Application filed November 12, 1894. (No model [0 all whom, it may concern:

Be it known that I, COLUMBUS K. ROGERS, of Salem, in the county of Essex, in the State of Massachusetts, a citizen of the United States, have invented a new and useful Improvement in Automatic Elevator-Brakes, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification, in explaining its nature.

This invention relates to means for stopping the descent of an elevator in case the hoisting-rope should part. Its details will readily be understood from the following description.

In the drawings, Figure 1 is an elevation. Fig. 2 is a transverse section 011 the line Q. Fig. 3 is a transverse section on the line 1?. Fig. 4 is'an enlarged View of the braking apparatus, wedge, and shoe. Fig. 5 is a transverse section of the wedge F at line X X.

A is the floor of the elevator.

J J indicate the floors of the building which it serves.

L is the hoisting beam, which carries the hoisting pulley or drum 0.

T is a sill at the bottom of the elevatorshaft. It serves as the anchorage of brakerods D, and any proper anchorage is its equivalent.

B is the head of the elevator, which is a frame for containing the elevator part of the braking apparatus.

1 1 are the uprights of the elevator -shaft, and R R are the fixed guides on which or in which counterpart guides in the elevator-car fit.

Care the uprights of the elevator-car,which connect the head B and bottom A of the car. Just inside these uprights, from top to bottom of the elevatorshaft, are stretched the brakerods D, represented in the drawings as wire ropes. They are represented as passing through beam L and through cup -washers above it, and as spread and wedged in these washers; but any other suitable way of making the upper ends of these rods fast to the beam L may be adopted. These rods D are anchored at M at the bottom of the elevatorshaft. A box, IE, is formed at each end of the headbeam B, the outer end of which is just clear of brake-rod D. The hoisting-rope N passes through an eyebolt, which lays hold of head-beam B through the spring H.

In the headbeam B are a pair of levers, G, hitched to the eyebolt, the outer ends of which engage with wedges F. It will be seen that by this arrangement the weight of the car will compress the spring H, lift the inner ends of levers G, and lower the outer ends so longas hoisting-rope N sustains the car, While if the rope N be parted the extension of spring H will lift the outer ends of lovers G and raise the wedges F. These wedges F have a tongue, F, formed on them, which tongue F bears against the brake -rod D in a recess of. the box IE. (Shown particularly in Fig. 3.) Each Wedge F has on its inner side two inclined planes terminated by hooks at their upper ends, and the thin ends of the wedges are up. Two transverse bolts, S, are under the hooks of the wedges, and the wedges normally rest on these bolts. Bolts S extend across box E in the end of head-beam B. \Vhen the levers G are moved by the spring H, to raise the wedges F, the inclined planes on the back of the wedges run up against the bolts S, and the tongue F nips the brake rod D between it and the end of box E, and the .descent of the car is checked.

In former use of wedges to check the descent ofan elevator-car when the rope breaks, the wedges have been made to bite on the cheeks of the vertical guides in the elevatorshaft. In this, special suspension-rods (called above "brake-rods) are provided, and no re liance is placed on the guides or ways. It is comparatively easy to make the box E in the head-beamBstrong enough not to be sprung by the wedges; but when the braking-wedges are brought to bear against the ways they must be braced from outside not to spring.

It is obvious that the brake-rods might be made stout enough to act as vertical ways; but in this case they would be brake-rods as well as ways.

Having thus fully described my invention, I claim and desire to secure by Letters Patent of the United States 1. The combination, with the car of an elevator and its hoisting-ro pe, of the spring H, adapted to be compressed by the weight of the car when suspended by the hoistingrope and IOO to extend when the hoisting-rope gives way, 2. In combination with the box E at the :0 in combination with levers G, Wedges F, and end of the head-beam of an elevatorcar, the pins S, arranged in the box E at either end of transverse pins S and wedge F, adapted in its the head -bearn, and in further combination Vertical motion to be driven toward the end 5 with brake-rods D, extended from one end to of the boX E, substantially as described.

the other of theelevator-shaft, whereby on COLUMBUS K. ROGERS. the parting of the hoistin g-rope the brake-rods Witnesses: D are seized by the brake F and box E, sub- E. A. PEALEN, stantially as described. THos. WM. CLARKE.

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