US799834A

US799834A - Safety-elevator.

Info

Publication number: US799834A
Application number: US23495104A
Authority: US
Inventors: Carolyn Edward Crump
Original assignee: Individual
Current assignee: Individual
Priority date: 1904-11-30
Filing date: 1904-11-30
Publication date: 1905-09-19
Anticipated expiration: 1922-09-19

Description

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C. E. GRUMP. SAFETY BLBVATOR. APPLICATION FILED NOV. 30, 1904.

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No. 799,834. 7 PATENTBD SEPT. 19, 1905.

` C. E. CRUMP.

SAFETY ELBVATOR.

APPLIUATIOH FILED Nov. ao, 1904.

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CAROLYN EDWARD CRUMP, OF WASHINGTON, DISTRICT OF COLUMBIA.

SAFETY-EI EvAToR.`

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Specification of Letters Patent.

` Patented sept. 19, 1905.

Application filed November SO, 1904. Serial N0. 234,951.

T0 nl 11i/tom, it may concern:

Be it known that I, CAEOLYN EDWARD CRUMP, a citizen of the United States, residing at IVashington, District of Columbia, .have invented certain new and useful Improvements in Safety-Elevators, of which the following is a specification.

Elevators are generally constructed to carry a given load with safety, and any excess thereedge of the details of construction of the means for effecting the result reference is to be had to the following description and accompanyingdrawings.

Figure 1 is a view in elevation of an elevator embodying the invention, the lower portion of the car being in section. Fig. 2 is a view similar to Fig. 1, showing the relation of the parts when the car is overloaded and locked to the guides of the shaft. Fig. 3 is a horizontal section on the line w of Fig. 1. Fig. 4 is a detail view of the guide mechanism between the car and the movable or false platform.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

The car 1, which may be of any pattern or make, is adapted to be operated by any suitable hoisting mechanism and is directed in its vertical movements by ways 2 at opposite sides of the shaft in the well-known manner.

the lock-bolts 4 are mounted in openings 5 of the bottom 6 and. are adapted to be pressed outward by means of coil-springs 7. Cords 8 or like flexible connections are interposed between the lock-bolts 4 and the movable or false platform 9 and pass around guide-pulleys 10. Under normal conditions the platform 9 is supported a distance above the bottom 6 and the lock-bolts 4 are held restricted against the tension of the springs 7. In the event of the car becoming overloaded the platform 9 is pressed downward, and the lock-bolts 4 being relieved of restraint are shot outward by the springs 7 and engage with the teeth of the bars 3 and hold the car in suspension.

The false platform 9 is yleldably mounted upon the bottom or'main platform 6 and is directed in its vertical movements by suitable guides, which, as shown, consist of toothed bags 11 and correspondingly-toothed wheels 12, the latter being mounted in brackets 13,'

secured to the platform 9. There are four toothed bars 11, each being located near a corner of the car. constructed so as to embrace opposite sides of the toothed portion of the bars 11, so as to prevent lateral displacement of the platform 9. The teeth of the

parts

11 and 12 are of Vform, thereby permitting of their free engagement and disengagement in each direction as the platform 9 moves^ up and down. As shown, a spring 14 is interposed between the platforms 6 and 9 and is preferably arranged at a central point and is connected at its ends to each by suitable attaching means. A housing 15 incloses the spring 14 and is connected at its upper end with the platform 9. Webs or braces 16 radiate from the housing l5 and stiften and strengthen the platform 9. The exible connections 8 pass upward through the spring 14 and housing 15 and are connected at their upper ends to the platform 9 in any determinate way. The strength of the spring 14 is such as to sustain a given load and to yield when the load is exceeded, thereby permitting the connections 8 to slacken and the springs 7 to come into play and shoot the lock-bolts 4 into engagement with the toothed bars 3 and lock the car or elevator in its shaft, thereby preventing strain of the hoisting mechanism and endangering the lives of passengers. A signal is combined with the elevator and is preferably of the electric type and may consist of either an audible or visual device, or both. The signal is indicated at 17 and may comprise a red light, an alarm-bell, and an indicator. The electric wires 18 extend from the signal 17 and termi- The toothed wheels 12 are IOO nate in contacts 19 and 20, which are normally separated and which are brought into engagement upon descent of the platform-9 .whenl overloaded, thereby completing the alarmcircuit and giving warning of impending danger b v overload of the car. The electric contacts 2O are carried by the platform 9, whereas the contacts 19 are attached to the bottom of platform 6.

The upward movement of the platform 9 may be limited by any means, and for this purpose chains 21 are employed and arercon- Y nected at their upper ends to said platform 9" and at their lower ends to the bottom or lower platform 6. It is contemplated to regulate the tension of the spring 14, and forthis purpose-a set-screw 22 is threaded into thebottom 6, and its upper end engageswith aplate 23, upon which the lower end of the spring, 14. rests. It beingl remembered that the platform 9 is limited in its upward movement, aturning of the set-screw 22 to compress the spring 14 more or less results in varying its resistance to the load imposed thereon. In other words, the platform being limitedhin: its upward movement by means of the Vchains 21 the spring 14 is compressed more or less by turning` the set-screw 22, with the result vthat its tension is varied and may be regulated tosupport any determinate load.

. Having thus described the invention; what is claimed as new is- 1. ln an elevator, the combination of thecar, means carried by the car for lockingit in= 1 its shaft, a yieldable platform for receiving the load, and connections between thefyield-v able platform and locking means to normally hold the latter in restraint.

2. In an elevator, the combination of a car, locking means carried by the car for securing it .in its shaft, and a yieldable platform for resecuring` thecar in its shaft, and a yieldable I platform :for sustaining the load and adapted to control thelocking means, substantially as set forth.

4.. vIn an. elevator, the combinationof a car, spring-actuatedv lock-bolts, a yieldable platform, and positive connections between-said platform*V and lock-bolts for holding-the latter in restraint under normal conditions.

5;: In an elevator, the combination of a car, oppositely disposed spring actuated lockbolts, a movable platform, aspring interposed between-said' platform and the bottom of the car for normallysupporting the platform, a housingY inclosing l said spring, and flexible connections between the platform and lockbolts, the latter being` normally held out of action and adapted to be shot outward upon descent ofthe platform `by an excess-of load.-

In=testimony whereof I aiiiX my signature in presence of-'two witnesses.

CAROL-YN EDWARDCRUMP. [1.. s.]

Witnesses: Y i

ROBERT'. V. .WILLETT, V. B. HILLYARD.`