US817431A - Safety device for elevators. - Google Patents

Description

PATENTED APR. 10, 1906.

TE. 'LUNDSTEN. DEVISE; 50R ELEVATORS.

API LIGATKOH FILED NOV. 16, 1905.

X? 1 i K x mm 62 i nnrrnn idTATE E dTT onion.

FRITZ LUNDSTEN, 0F CORONA, NEW YORK, ASSIGNOR OF ONE-HALF TO THEUDOR ESKiLSSON. OF ASTORIA, NEW YORK.

fife. 817,431.

fipecification of Letters Patent.

Eatented April 10, 1906.

Application filed November 16, 1905, Serial No. 287,554.

To all whom, it may concern:

Be it known that I, FRITZ LUNDSTEN, a citizen of the United States, and a resident of Corona, county of Queens, and State of New York, have invented a certain new and useful Improvement in Safety Devices for Elevators, of which the following is a specification.

.My invention relates to safety devices for elevators; and its object is to improve upon structures of this kind now in use and to provide a device for quickly and powerfully clamping an elevator-car to the guides ove which it is adapted to run.

I will describe my invention in the following specification and point out the novel fea turcs thereof in claims.

Referring to the drawings, Figure 1 is a diagrammatic view, in side elevation, of an elevator-car and certain connected apparatus which may be used in carrying out my invention. Fig. 2 is a plan view, partly in sec tion, of my safety device, showing sections of the guides which it is intended to clamp. Fig. 3 is a detail of certain of the parts shown in Fig. 2, but in different relative positions.

Fig. 4 is a side elevation of a part of the apparatus shown in Fig. 2. Fig. 5 is a sectional end view of certain of the parts, the section being taken through the line A B of Fig. 4. Fig. 6 is a detail of a cam. Fig. 7 is a detail of a part-of a tripping device which I use in carrying out my invention.

Like characters of reference designate cor responding parts in all of the figures.

1O designates an elevator-car to the bottom of which my device is attached.

1.1 is a hoisting-rope for the car.

12 is a governor-rope connected to run with the car. This governor'rope runs under a sheave 13, situated near one end of the cars travel. It may be weighted, as at 15, and pawls 16 16 may be provided, if desired, to engage with ratchets in the sides of the weight 15 to prevent its upward movement.

v The governor-rope 12 runs over another sheave 14 near the other end of the cars travel, which is connected to a governor or speed regulator 17 by suitable gearing 1-8. The speed-governor is arranged to actuate a gripping device 19, which grips and positively locks the governor-rope whenever the car runs in excess of normal speed. It mhy be regulated. or set to operate at any desired speed and may be arranged to operate when the car is running in either direction. The governor-rope is yieldingly connected to the car at 12 and is so arranged that when the governor-rope 12 is sto pod and the car continues to move it Wll pull awayfrom the yielding connection. This will cause he rope 12*, which is attached to governor-rope 12, to be pulled through the ulleys 12 12 and to be unwound from a di'um 31 on the safety device, and thereby impart a rotary motion to the winding-drum 31. It is sometimes desirable to rotate the winding-drum 31 by hand from the car, and for this purpose I have provided another rope 12 on the winding-drum and attached this rope to a handle 12 within reach of the operator in the car.

I will now refer to Fig. 2 and describe the clamping device or safety device for the elevator-car, which is there illustrated. The winding-drum 31 is rotatably supported by brackets 34 34, which are rigidly mounted upon a frame 30 30, which holds the safety device and which is preferably attached to the bottom of an elevator-car. The drum 31 may be grooved, as shown at 32, for the receptlon of the rope 12*, which is attached. to it. The inside of the drum is provided with right and left hand screw-threads, in which screws 35 and 36 work. The outer end of these screws are attached to Wedgeshaped cams 25 25. 21 21 designate gr1pping-jaws, which are eccentrically pivoted at 40 to the frame 30 in a manner which will be specifically pointed out later, as it forms an important part of my invention. These jaws are adapted to be moved against and to clamp guides 22 22, over which the car 10 is arranged to run, and to thereby lock the car to the guides. The inner ends of jaws 21 21 may be provided with antifriction-rollers 24 24, which are arranged to coact with the wedge-shaped cams 25, as will be fully described hereinafter. 60 is a locking-lever which is pivoted at 61 to a bracket 64, which is attached. to the frame 30. One end 62 of this locking-lever is held against a cam 7 0,

pivoted at l as follows: mounted in frame 30. A circular hub 42 is eccentrically attached to this pin. The jaw 21 is provided with a circular hole which fits over this hub. A short arm 44 is rigidly attache-d to the outer end of pin l1, and the projecting lug 45, upon which. the end 63 of locking-lever 6U rests, is at the end of this short arm. A spring 43 is provided for the purpose of turning pin 41 and its attached parts around, when released, into the position shown in Fig. 3. he parts above described are the same for all. of the pivoted joints of the jaws 21, except that the short arm 46 of one of each pair of pivots need not have any projecting lug, such as 45, upon it. The cam 70, which is on drum 31 and upon which one end of lever 60 rests, may be of the form shown in Fig. 6. The greater part of its surface is concentric with the center line of the screws and 36. One or more depressions 72 may be provided on its surface.

I will now describe the operation of this invention. Under usual conditions, when car is running, the various parts will be .he positions in which they are shown in Eig. 2. it may be seen from this figure that parts of the gripping-jaws 21 21 which are near the guides are so placed that there is a considerable clearance between the jaws and the guides. This is a valuable feature, for it prevents all friction between these parts while the car is running, and consequently there is no i. oar on these parts. Whenever the car attains undue speed, so that the governor 3? acts and causes the re e to be pullcdin the manner previously escribed, the windirig-drum 3.1 an the cams 70 will be turned thereby. The first effect of this movement will be to depress the end 62 of lockingdever 60 and a similar lever 60*, if more than one is provided, as is shown in Fig.

the concentric part 71 of cam 78 bein turned under the end of this lever. This wil raise the opposite end 63 of locking-lever 60 until it is clear of the projecting lug -15 on the end of the short arm 44. It may be seen in Fig. 2 that this short-arm 44 holds the short arm 46 from turning. When the lockinglever releases these two arms 4-1 and 46, as just described, the springs 43 43 will cause them and'the pins 41 11, to which they are attached, to quickly rotated until they reach the positions against stops l7 and 48 indicated at n and 46 in Fig. 2 by dotted lines. when the eccentric hubs are in this position, they will not be returned to their iormer position by any pressure which may be brought u on. them by the further operation of this d -vice, because their position is such that the pressure of the jaws 21 upon them cannot force them back. The ell'ect of this movement will be to quickly move the ends of the gripping-jaws 21 up to the guides A pin 41 is looselybut itisnot necessary that this movement amass.

screws 35 and 36 to be moved toward each other and to thereby draw the wedge-shaped cams 25 25 together. These wedge-shaped cams will thus be drawn in between the antifriction-rollers 24 24 and will cause the jaws 21 21 to grip the guides 22 22 with great force. This will lock the car 10 to the guides 22 22 and will thus bring it to rest, which of course will cause the movement of the winding-drum to cease. The various parts may be reset by hand. If desired, springs 26 26 may be provided to keep the jaws away from the guides when not forced on by the abovedescribed mechanism.

Means may be provided for o crating this device from the car independenty of any action. of the governor 17. For this purpose rope 12 may be attached to winding-drum 81 and led up through the car, as shown in Fig. 1, with a handle 12 attached to its end. It is obvious that if an operator in the car pulls u on this handle 12 the operation of the device will be similar to that already de scribed.

This arrangement, which I have now described, provides an ideal safety-stop for elevators, as the parts when not in use are free from wear and as its action is quick but is positive and powerful.

What I claim is I 1. In a safety device for elevators, the combination of a car, guides for the car, grippingjaws upon the car, supports for said jaws and means for shifting the position of said supports. a

2. In a safety device for elevators, the combination of a car, guides for the car, gripping jaws upon the car, pivots for said jaws,means for shifting the position of the pivots and the jaws and additional means for moving the jaws.

. 3. In a safety device for elevators, the combination of a car, guides for the car, grippingjaws upon the car, pivots for the j aws,means for shifting the position of said pivots to ward the guides, and additional means for tightening the jaws upon the guides.

41. In a safety device for elevators, the combination of a car, guides for the car, grippingjaws upon the car, pivots for the jaws, means 7 For shifting the'position of the pivots toward the guides quickly and additional means for tightening the jaws upon the guides more slowly with greater force.

5. In a safety device for elevators, the combination of a car, jaws upon the car, pivots for the jaws, springactuated means for shifting'the position of the pivots toward the guides quickly and a screw for tightening the jaws upon the guides more slowly with greater force.

6. In a safety device for elevators, the comguides for the car, grippingsmear bination of a car, guides for the car, gripping jaws upon the car, pivots for the guides,

spring actuated means for quickly shifting the position of the pivots toward the guides, a locking device for said spring actuated mechanism and a screw mechanism arranged to tighten the jaws upon the guides.

.7. in a safety device for elevators, the cons loination of a car, guides for the car, grippingjaws upon the car, eccentric pivots for the jaws, s ring-actuated mechanism for turning sai eccentric pivots, a locking device for said springectuated mechanism, a cam for releasing said locking device and a screw mechanism arrangedto tighten the jaws upon the guides.

8. Ina safety device for elevators, the com loination of a car, guides for the car, grippingjaws upon the car, eccentric pivots l' r the jaws, spring-actuated mechanism for turning said eccentric pivots, a locking device for said spring-actuated mechanism, a cam for releasing said locking device, a screw mechanism arranged to tighten the iaws upon the guides and means for actuating the cam and the screw by the motion. of the car,

9. In a safety device for elevators, the coinhination of a car, guides for the car, gri pingjaws upon the car, eccentric pivots or the jaws, spring-actuated mechanism for turning said eccentric pivots, a locking device for said spring-actuated mechanism, scam for releasing said locking device, a screw mechanism arranged to tighten the jaws upon the guides, means for actuating the cam and the screw by the motion of the car when this speed of the car has reached a predetermined limit.

10. In a safety device for elevators, the combination of a car, guides for the car, grip ping jaws upon the car, eccentric pivots for the jaws, springactuated mechanism for turning said eccentric pivots, a locking de vice for said spring-actuated mechanism, a cam for releasing said loclring device, a screw mechanism arranged to tighten the ja is upon the guides, means for actuating the cam and the screw bythe motion of the car when the speed of the car has reached a predetermined limit, and means for actuating the cam and the screw by hand. I

11. In a safety device for elevators, the

combination of a car, guides for the car, gripping-jaws upon the car, eccentric pivots for the jaws, s ring actuated mechanism for turning sai eccentric pivots, clocking device iorsaid sprine actuated mechanism, a cam -for releasing said locking device, a screw mechanism arranged to tighten the upon the guides and a governor connected to run with the car and arranged to actuate the cam and the screw when the car has reached a predetermined limit.

12. In safety device tor elevators, the combination of car, guides for the car, grip pingjaws ping-jaws upon the car, pivots for the jaws, mechanism to shift the position of the pivots toward the guides, a normally compressed spring arran ed to actuate said mechanism, and a screw or tightening the jaws upon the 3U guides.

13. in a safety device for elev tors, the combination of a car, guides for-tin: ear, gripping-jaws upon the car, pivots for the jaws, mechanism to shift the position oi the pivots toward the guides, anormally compressed spring arranged. to actuate said mechanism, means for releasing said springs and a screw tor tightening the jaws upon the guides.

14. in a safety device for elevators, the combination of a car, guides for the car, gripping-jaws upon thecar, eccentric pivots for the laws, means for turning said eccentric pivots, a spring arranged to actuate said pivot-turning means and to thereby move the jaws toward the guides and to pcsitiveiy hold. thciii in their moved. position. and i'urthcr means for positively tightening the jaws upon the guides.

15. In'a safety device for elevators, the combination of a car, guides for the car, gripupon the car, pivots for jaws, spring-actuated means for shifting the po. tion of tho pivots toward the guides quit dy and right and left hand screws for tighteidng the jaws upon the guides more slowly with greater force. 4

.16. In a safety device for elevators, the combination of a car, guides for the car, ping-jaws upon the car, eccentric pivots ior the java, springactuated mechanism iciturning said eccentric pivots, a locking device for said spring-actuatcd mechanism, a cam for releasing said locking device and. right and left hand screws arranged to tighten. the jaws upon the guides.

17. In a safety device for elevators, combination of a car, guides or the ping jaws upon. the car, eccentric .fots or the jaws, spring-actuated mechai for turning said eccentric pivots, a loclnng de i ice for said spring-actuated mechanism, a cam for releasing said locking device, right and left hand screws arranged to tighten the 5 upon the guides and means for actuat' 1 earn and the screws by the motion of in 1.8. in a safety device for elevators, comi-iination of a car, guides for the car, 3' ping jaws upon. the car, eccentric pivots the jaws, spring-actuated mccl'ia'nisni turning said eccentric pivots, a locking device, for said spring-actuated mechanism, a cam for releasing said locking device, right and left hand screws arranged to tighten the jaws "upon the guides, means for actuating the cam and the screws by the motion of the car when the speed of the car has reached a predetermined limit. I 19. In a satet deviceior' elevators, the

combination oil a car, guides for the car, grip-- ed to run with &

ping-jaws upon the car, eccentric pivots for the jaws, s ringactuated mechanism, for turning sai eccentric pivots,. a locking de vice for said spring-actuated mechanism, a cam for releasing said locking device, right and left hand screws arranged to tighten the jaws upon the guides and a governor connectthe car and arranged to actuate the cam and the screws when the car has reached a predetermined limit.

20. In a combination of a car, guides for the car, gripping-jaws upon the car, eccentric pivots for the jaws, spring actuated mechanism for turning said eccentric pivots, a locking device safety device for elevators, the

FRITZ LUNDSTENJ Witnesses i Jossrrr E. CAVANAUGH, E. W. MARSHALL.

means for actuat-

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