US324144A - Safety-brake for elevators - Google Patents

Description

(No Model.)

J. W. METZ.

SAFETY BRAKE FOR ELEVATORS.

Patented Aug 11, 1885.

"WITNESSES INVENTOR:

ATTORNEYS.

n Waihinglon. D C- PATENT FFlCE.

JOHN w. MET'Z, or MANCHESTER, onto.

SAFETY-BRAKE FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 324,144, dated August 11, 1885.

Applicationfiled June 5. 1885.

To all whom it may concert.-

Be it known that I, J OHN W. METZ, of Manchester, in the county of Adams and State of Ohio, have invented a new and Improved Safety-Brake for Elevators, of which the following is a full, clear, and exact description.

My invention relates to elevators, and particularly to safety brakes or stops therefor, and has for its object to provide simple, inexpensive, and efficient means for stopping the elevator carriage should the hoisting rope break or other accident occur.

The invention consists in a novel construction and arrangement of cam-headed grip-1evers and operating-levers, both pivoted to the elevator-carriage, and connected by links and by pull-cords leading to the carriage within reach of its occupantswho may by pulling on the cords cause the grip-levers to take hold of the carriage guide-posts or Ways and stop the carriage, all as hereinafter fully described and claimed.

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.

Figure 1 is a side elevation of an elevatorcarriage fitted with my improved safetybrake, and showing also the opposite side walls, and one of the guide-posts of the carriage in section and the brake out of use. Fig. 2 is a detail side view illustrating the safety-brake applied at one side of one guide-post, and illustrating the operation of the brake in stopping the carriage. Fig. 3 is a view at right angles to Fig. 1, and showing the same parts; and Fig. 4 is a perspective view of the hand-grasp and pull-cords arranged therewith for double brakes at each side of the carriage.

The letter A indicates the elevator carriage or cage, which has a platform, a, side posts a c, and head-piece a", to which the hoistingrope B is attached in any approved way. The

- carriage side posts, a a, have attached to them the lugs or plates 0 which work along each side of the guide posts or ways D D,fitted at and along opposite sides of the elevatorshaft', to guide the carriage in its movements up and down the shaft.

In the preferred arrangement of the safetybrake devices I use them one at each side of (No model.)

each guide post D, of the carriage, as illustrated most clearly in Fig. l and next described.

On strong pins 6 e fixed in the side of the platform a of carriage A, and ashort distance from the guide-posts D,are pivoted the grip or stop levers E, which have eccentric or cam heads F provided on their cam-faces, which are presented to the posts D with teeth f which are adapted to bite into the posts D, as presently described. The grip-levers E extend outward from the posts D, and are connected at their outer ends by links G,with their operating-levers H,which are pivoted at it about at their centers to the'carriage-platform, and carry at their inner ends the weights Lwhich normally act to raise the outer ends of griplevers E, and keep their cam-heads F away from the guideposts, so that the carriage A will move freely up and down the elevatorshaft.

To the weighted end of each of the levers H is connected the end of a cord, rope,or chain, J,which passes upward to and over guide-pulleys K,'jonrnaled in keepers k or otherwise, to the side posts, a, of the carriage A, and from said pulleys the cordsJ pass to a hand-grasp, L, which is supported by the cords near the top of the carriage, as in Fig. 3, or so as to be Within reach of the occupants of the carriage.

The hand-grasp L may be of any suitable construction, and the pull-cords may be attached toit in any approved way, but I prefer to make the hand-grasp of apiece of metal tubing or pipe, and to pass the cords J J ina loop around one side of the hand-grasp, so that one cord really forms. the two opposite pull-cords J J, for operating the pair of le vers H H at the front of the opposite guideposts D D, and another cord forms the other two pull-cords operating the pair of levers H H at the rear of the gnideposts. (See Figs. 3 and 4.) 7

It is evident that should the hoisting-rope B break and the carriage be free to fall, or if for any other reason it is desired to stop the movement of the elevator-carriage, it only is necessary to pull on the hand-grasp L,whieh will operate the levers H to force the outer ends of levers E downward, and carry the gripping-faces of their cam-heads F against the carriage guide-posts 1), and instantly or almost instnntl y stop the carriage.

\V hen the levers E H are arranged at one side only of the opposite guide-posts, D D, heavy blocks or dead stops M will be fixed t0 the carriage-platform at the opposite faces of the guide-posts, as shown in Fig. 2, and when the hand-grasp L is pulled to draw on the cords J the levers E will forcibly draw the stops M to the posts D as they take a bit-inggrip 011 the opposite faces of the posts by their ezun-hends F.

Upon releasing or letting go of the handgrasp L the weights I of levers H will draw them back to horizontal position, and release the cams F from the guide-posts D, as will be readily understood.

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

2. The combination, in asafety-brake for 30 elevators and with the carriage A and its guide posts or ways D, of levers E H, pullcords J, pulleys K, and hand-grasp L, substantially as herein set forth.

JOHN W. METZ.

\Vitnesses:

W. T. linemen, E. R. Gnnoony, Jr.

Images