US740566A

US740566A - Safety appliance or attachment for elevators.

Info

Publication number: US740566A
Application number: US15170803A
Authority: US
Inventors: Gustaf Holger
Original assignee: Individual
Current assignee: Individual
Priority date: 1903-04-09
Filing date: 1903-04-09
Publication date: 1903-10-06
Anticipated expiration: 1920-10-06

Description

740,566. v PATENT'ED OCT. 6, 1903..

- G. HOL'GER. SAFETY APPLIANCE 0R ATTACHMENT TOR ELEVATORS.

APPLICATION FILED APR. 9. I903.

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UNITED STATES PATENT Fatented October 6,1903. 1

OFFICE.

SAFETY APPLIANCE OR ATTACHMENT FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 740,566, dated October 6, 1903. Application filed April 9, 1903. Serial No. 151,708. (No model.)

To all whom it may concern.-

Be it known that I, GUSTAF HOLGER, a citizen of the United States,residin g at Chicago, in the county of Cook and State of Illinois,

5 have invented a Safety Appliance or Attachment for Elevators, of which the followingis a specification.

This invention relates to improvements in an apparatus to be used in connection with the car or cage of an elevator-shaft; and it consists in certain peculiarities of the construction, novel arrangement, and operation of the various parts thereof, as will be hereinafter more fully set forth and specifically claimed;

The principal object of my invention is to provide simple and inexpensive means for positively and automatically stopping the elevator caror cage in the event of the breakage of the lifting-cable or the'derangement of the operating mechanism.

Another object of the invention is to provide a safety attachment for elevators which may be applied to the cars or cages of the or- I dinary construction without any material alteration or change thereof.

Other objects and advantages of the invention will be disclosed in the subjoined description and explanation.

In order to enable others skilled in the art to which my invention pertains to make and use the same, I will now proceed to describe it, referring to the accompanying drawings, in which- Figure 1 is a view in elevation of a portion of the guides of an elevator, showing a car or cage located therebetween and equipped with an attachment embodying myinvention. Fig. 2 is a top plan View of the car, showing by dotted lines the mechanism for operating the catching-dogs and also illustrating by dotted lines the position of the bell-cranklever after it has been released from the trippinglever. Fig. 3 is a bottom plan view of the car, showing the mechanism for operating the dogs thereon. Fig. 4 is a detached perspective view of one of the hangers for the catching-dogs. Fig. 5 is a detached perspective view of one of said dogs. Fig. 6 is an enlarged'perspective view of the tripping-lever and'its support, showing them detached from the car. Fig. 7 is a similar view of one of the governor-balls and a part of its stem. Fig.

8 is a view in side elevation of the upper portion of the car removed from the guides and showing by continuous lines the normal position ofthe governor-balls, but illustrating by dotted lines the position to which one of said balls will be limited by means of the guiding-yoke in the elevation of the said balls. Fig. 9 is a plan view of the top of the car, showing by dotted lines the are described by the governor-balls when elevated sufficiently to strike and release the tripping-lever; and Fig. 10is an enlarged perspective view of the upper portion of the tripping-lever and its support.

Like numerals of reference refer to correspondingparts throughout the difierent views of the drawings.

The reference-numerals l0 and 11 represent the uprights or guides, such as are usually placed and secured to the side walls of the elevator-shaft. Each of these guides has on its inner surface a rack 12, with which the dogs carried by the car 13 are adapted to engage, as will be presently explained. The guide 11 also has on its front or rear surface a rack 14, with which a pinion 15 meshes. Said pinion is rigidly mounted on the outer end of a shaft 16, which is journaled in suitable bearings 17 on the upper surface of the Mounted on the inner end of the shaft 16 is a beveled gear 18, which meshes with a similar gear 19, rigidly mounted on the governor-shaft 20, which is vertically journaled in a bracket 21, located on the upper end of the car. Mounted on the shaft 20 and extending outwardly and upwardly therefrom is a yoke 22, each arm of which is provided. with a slot 23 for the reception, operation,-

and guidance of the shanks or stems 24, on which the governor-balls are secured. The upper ends of the stems 24. are secured to the ends of a clip 26, fixed on the upper portion 0f the governor-shaft.

As shown in Fig. 2 of the drawings, the.

stems 24 pass through the slots 23 in the guide-yoke, which will cause the balls 25 to .rise therein by reason of the centrifugal force and usually at each side thereof, are upright bars 27,which are connected at their upper ends to a bar 28, to which the lifting-cables V 29 are secured at one of their ends. Mounted on the upper end of the car, near one of its sides and in an upright position, is a standard 30, the upper end of which is bent inwardly and laterally to form a knife-edge-like point 31, against the upper surface of which the free ends of the stems 24 will strike in their revolution when the car is descending rapidly, so that they will be guided above the standard in such a manner as to strike the upper end of the tripping-lever. Fulcrumed to the standard 30 is a tripping-lever 32, the upper portion of which is bent inwardly, as at 33, to overlap the inwardly-bent portion of the standard 30 and is then bent upwardly to form an extension 34, against the edge of which the free ends of the governor-ball stems will strike. Located vertically on the side of the car opposite the rack 14 is a rod 35, which is journaled in suitable bearings and has rigidly secured to its upper end a bell-crank lever 36, the longer arm 37 of which is normally engaged by the downward projection 38 on the lower portion of the tripping-lever 32, while the shorter arm 39 is preferably formed with a handle 48, to be used for retracting said lever, so as to engage the tripping-lever. Secured to the bottom of the car at each of its sides is a box-like hanger 40, which has its lower end and side adjacent to the guide open. Pivotally secured in each of the hangers 40 is a boxshaped dog 41, within which is secured a spring 42 to throw the same outwardly at its lower end.

By reference to Fig. 1 of the drawings it will be seen that one end of the spring 42 rests against the inner surface of the hanger 40, while its other end rests against the lower outer portion of the dog. .Pivotally secured at about its middle to the bottom of the car and on its lower surface is a bar 43, to one end of which is secured a connecting-rod 44, the other end of which is secured to one of the dogs. Connected to the other end of the bar 43 is a rod 45, which is connected at its other end to a crank 46 on the lower end of l the shaft or rod 35, which extends vertically alongside of the car, as before stated. Connected at one of its ends to the bar 43, between the end thereof to which the rod is secured and the pivot of said bar, is a rod 47, which is connected at its other end to the dog on the opposite side of the car.

From the foregoing and by reference to the drawings it will be seen and clearly underthe above-named positions, the car may travel upand down the elevator-shaft at its ordinary or customary speed; but if the liftingcables should break or the car should descend too rapidly the governor-balls will be swung outwardly by centrifugal force, in which operation the free end of one of the stems 24 will strike the extension 31 on the standard 30, and thereby be guided so as to impinge the upper end of the tripping-lever, which will be released from the longer arm of the bell-crank lever, thus allowing the springs to force the dogs outwardly, so as to engage the teeth of the racks on the guides, thus preventing further downward movement of the car.

It is apparent that by forming the upper end of the tripping-lever with a recess therein adjacent to the point or extension on the support 30 when one of the free ends of the stems of the governor-balls strikes the tripping-lever the recess will prevent said stem falling between the leverand its support after the former has been turned on its fulcrum. It is further evident that the supporting-standard 30 for the tripping-lever 32, which, as before stated, is fulcrumed thereon, is so located that it, as well as the said lever, will be outside of the arc described by the free ends of the stems 24, which carry the governor-balls, until said balls shall have almost reached the upward limit of their movements. When thus raised by centrifugal force, one of the stems will pass over the point 31 on the upper portion of the standard 30 and be guided by said point or projection until it strikes the extension 34 of the tripping-lever, which is provided with the recess 60, for the purpose above set forth. The projection 31 being pointed and having a very thin edge presented toward the path of the stems 24 will render the action of the stems positive, so as to strike the trippinglever and release it from the longer arm of the bell-crank lever.

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

1. In a safety appliance for elevators, the combination with the guides in an elevator shaft, of a rack on the inner surface of each, another rack on the front or rear surface of one of said guides, a car movably mounted between the inner racks, a shaft horizontally journaled on the top of the car, a pinion on one end of said shaft and a beveled gear on its other end, a governor-shaft vertically j ournalednear the inner end of said shaft, a beveled gear on. its lower end, an upwardlycurved and slotted guide fixed on the governor-shaft, a pair of stems pivotally secured on the upper portion of said shaft, a ball mounted on each of the stems between their ends, a standard vertically mounted on the top of the car and having a lateral extension at its top, a tripping-lever fulcrumed thereto, a vertical shaft journaled on the side of the car, a bell-crank lever fixed to the upper endof said shaft so as to engage the trippinglever, a spring-actuated dog pivotally secured on the bottom of the car at each side thereof,

a bar pivoted on the bottom of the car, and connections uniting said bar to the dogs and vertical shaft, substantially as described.

. 2: In a safety appliance for elevators, the combination with the notched guides in an elevator-shaft, of a rack secured to the frontor rear surface of one of said guides, a car movably mountedbetween the guides, a tripping-lever fulcrumed on the upper end of the car, a shaft vertically journaled on the side of the car adjacent to said lever, a bell-crank lever fixed on the upper end of said shaft and adapted to engage the tripping-lever, a crank on the lower end of the vertical shaft, a spring- GUSTAF HOLGER.

Witnesses:

CHAS. O. TILLMAN, A. GUSTAFSON.