US675330A - Safety attachment for elevators. - Google Patents

Description

No. 675,330. Patted may 2a, lam.

A. IHLENFELDT.

SAFETY ATTACHMENT FOR ELEVATORS.

(Application iled Apr. 4, 1900.)

(No Model.)

NITED STATES PATENT OFFICE.

AUGUST IHLENFELDT, OF SPRINGFIELD, ILLINOIS, ASSIGNOR OF ONE-HALF TO LOUIS IHLENFELDT, OF SAME PLACE.

SAFETY ATTACHMENT FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 675,330, dated May 28, 1901.

Application led April 4, 1900. Serial No. 11,445. (No model.)

To all whom it nfl/Cty concern:

Be it known that I, AUGUST IHLENEELDT, a citizen of the United States, residing at Springfield, in the county of Sangamon and State of Illinois, have invented new and useful Improvements in Safety Attachments for Elevators, of which the following is a speciflcation.

This invention relates to improvements in 1o elevators, and more especially to safety attachments for the same.

The objects of the invention are to provide a simple and effective mechanism for temporarily suspending the elevator cage or car in the event of an accidental breaking or parting of the hoisting rope or cable and, furthermore, to absorb the jar resulting therefrom.

With the above objects in view the invenzo tion consists in certain features of construction and combinations of parts hereinafter referred to, and particularized-and pointed out in the claims.

In the drawings, 1 designates an elevator cage or car of the usual construction, the same being designed to move in the ordinary guides 2, at one side of which-is a third guide 3,which,in connection with the adjacent guide 2, in this instance forms the guide for the 3o weight-frame 4,in which are located the counterbalancing-weights 5.

Supported upon the cross-timbers 6 in suitable bearings are pairs of sheaves or pulleys 7 and 8, and at the bottom of the well of the elevator there is located the usual windingdrum 9, at one end of which is located the gear-wheel 10, which latter, and therefore the drum, is rotated through the medium of in this instance a wormshaft 11.

4o To a ring 13 or other usual fastening means upon the top of the elevator is secured the elevating-cable 12, which passes up and over the pulleys 7 and is secured to and wound upon the winding-drum 9, as is usual. A

safety supplemental cable 14 is likewise secured to the ring 13 or other fastening device at the top of the cage or car, passes upwardly and over the pulleys 8, and at its opposite end is secured to the upper end of the 5o counterbalaneing-weight frame 4. Below the weight-frame, at the bottom of the well, on a shaft 15, suitably supported, is a pulley 16.

In the bottom of the weight-frame an opening 17 is formed, in which is loosely formed an eyebolt 18. At the upper end of the eyebolt,within the weight-frame,a nut and washer 19 and 20, respectively, are located, and between the washer and the lower cross-bar or bottom of the weight-frame and coiled upon the eyebolt is a cushioningspring 21. A 6o cable 22 has one end secured to the eye or lower end of the eyebolt 18, depends from the same, passes under and partially around the pulley 16, and is secured to and wound upon the drum 9 or asupplementaldrum that may 65 be provided for its reception, but which is mounted upon the same shaft 24 as said drum and which ofcourse is the winding-shaft of the elevator mechanism. The two cables 12 and 22 are wound upon the drum in the same dii 7o rection, so that as the direction of rotation of the drum unwinds cable 12, and therefore lowers the car or cage, the cable 22 will be nnwound from the said drum, and vice versa, the spring 2l at all times acting to form a 75 yielding connection between the cable 22 and the supplemental cable 14.

It will be observed that in the event of an accidental breakage of the elevating-cable 12 the car or cage cannot fall, but will be sup- 8o ported securely by the supplemental cable 14, thus avoiding disastrous results. It will also be observed that all shock that would under ordinary circumstances result from a sudden breakage of the cable l2 and the shifting of 85 the entire weight upon the cable 14 will be absorbed by the spring 2l yielding to the suddenly-increased load thrown upon it. Furtheamore, the winding-drum will under such circumstances perform its usual function and 9o in so doing through the instrumentality of the cables 14 and 22 will elevate or lower the car or cage upon a`manipulation of the usual manually-operated controlling devices contained within the car.

Having described my invention, what I claim is- 1. The combination with an elevator-car and its hoisting mechanism, of overhead pulleys, a supplemental cable connected to the 10o ear and passed over said pulleys, a weightframe connected to said supplemental cable,

and a second cable wound in the same direction as the hoisting-cable upon the windingdrum, and having a yielding connection with said weight-frame.

2. The combination with an elevator-oar and its hoisting mechanism, of overhead pulleys, a supplemental cable connected to the ear and passed over said pulleys, and a cable wound upon the winding-drum in the same direction as the hoisting-cable, and a yielding connection between the latter Cable and the said supplemental cable.

3. The combination with an elevatorear and its hoisting mechanism, of the overhead pulleys, S, the supplemental cable, 14, passed over the same and connected to the oar, the weight-frame, 4, connected to the opposite end of said supplemental cable, the eyebolt, 18, a nut at the upper end of the same, the coiled spring, 21, upon lthe bolt and interposed between the nut and bottom of the frame, the pulley, 16, and the cable, 22, connected to the lower end of the eyebolt and passed around the pulley, 1G, and secured to and wound upon the winding-drum of the hoisting mechanism in the same direction as the hoisting-cable.

In testimony whereof I affix my signature in presence of two witnesses.

AUGUST IHLENFELDT.

Witnesses:

IRVING BARKER, F. R. FISHER.

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