US777166A

US777166A - Elevator safety-clutch.

Info

Publication number: US777166A
Application number: US18842704A
Authority: US
Inventors: Andrew Whelan
Original assignee: W H PITTENGER
Current assignee: W H PITTENGER
Priority date: 1904-01-11
Filing date: 1904-01-11
Publication date: 1904-12-13
Anticipated expiration: 1921-12-13

Description

PATENTED DEC; 13, 1904.

A. WHELAN.

ELEVATOR SAFETY CLUTCH.

APPLIGATION FILED JAN.11. 1904.

N0 MODEL.

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PATB NTED DEC. 13, 1904.

A. WHELAN.

ELEVATOR SAFETY CLUTCH.

APPLICATION FILED JAN. 11, 1904.

M MODEL.

UNITED STATES Patented December 13, 1904.

PATENT OFFICE.

ANDREW WHELAN, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO W. H. PITTENGER, OF PITTSBURG, PENNSYLVANIA.-

ELEVATOR SAFETY-CLUTCH.

SPECIFICATION forming part of Letters Patent No. 777,166, dated December 13, 1904.

Application filed January 11, 190A. Serial No. 188,427. (No model.)

To all whom itmwy concern:

Be it known that 1, ANDREW WHELAN. a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State 5 of Pennsylvania, have invented certain new and useful Improvements in Elevator Safety- Clutches, of which the following is a specific tion, reference being had therein to the accompanying drawings, forming part of this I specification, in which Figure 1 is a view in side elevation of an elevator equipped with my improved safety locking apparatus, showing the device out of engagement. Fig. 2 is a partial similar View showing the device in engagement. Fig. 3 is a partial plan view. Fig. 1 is an enlarged detail view of the locking mechanism. Fig. 5 is a cross-seetional view on the line V V of Fig. 2. Fig. 6 is a detail view at right angles to Fig. 5, showing a portion of the rock-shaft and the apron. Fig. 7 is a detail view similar to Fig. 4:, showing a double-clamp arrangement. Fig. 8 is a similar view showing a modified construction of latch mechanism.

5 My invention consists of an improvement in mechanism for automatically arresting the descent of elevator-cars in case of accidental falling, and is designed to utilize the upward pressure of air to apply the braking mechan- 3 ism simultaneously with the fall of the ele vator-car whenever a certain predetermined downward speed is exceeded.

Referring to the drawings, 2 is the elevator-car, suspended by the usual cables and provided with the customary guides within the shaft. Rigidly secured at the top of the shaft and also preferably at the bottom is a cable 3 or any other suitable equivalent of suflieient size and strength to support the car 4 when gripped by the brake.

1 is a bar of metal secured to the framing of the car underneath and preferably at one corner'or side, having at its outer end a vertical recess terminating in a rounded bearing 5, adapted to embrace the cable 3.

6 is a bolt having a rounded extremity 7 embracing the cable, the turned-in end of the bolt entering a recess or cavity 8. The long end of the bolt 6 passes through bar 4: and is threaded, as at 10, the threaded portion being 5 O engaged by the threaded hub of a pinion 11,

in mesh with a corresponding pinion 12. These pinions are mounted between the sides of yoke-frame 13, freely journaled on bolt 6 and provided with a downwardly-extending arm 14, by which the yoke-frame 13 may be tilted upwardly.

15 is a rack secured on the-inner side of the elevator-shaft and so located that when the yoke-frame is in its normal pendent position, as in Figs. 1 and 4:, the pinion 12 will just clear the teeth of the rack as the elevator-car travels up and down. The bar 4. or any other suitable supporting-frame is provided with pins or abutments 16 17, by which the travel 5 of the yoke-frame is limited in either direction. the weight of the outer pinion normally holding it down and back against stop 16, Fig. 4:. J ournaled in suitable bearings 18, depending from bar 1 or from the underfram- 7 ing, is a rock-shaft 19, to which are secured two or more arms 20, extending across underneath the ear and preferably at each side.

21 is an apron, of canvas or other light ma terial, secured to arms '20 and of practically the full area of the elevator-shaft, adapted to receive air-pressure as the ear descends, while the outer extremity of one or both arms 20 rests upon any suitable support, as a liftingarm 22, having a hook 23 at its lower end or 30 slotted, as preferred. This support is normally sufliciently far below the bottom of the car to permit of considerable upward travel of the apron, due to air-pressure in case of rapid dropping of the ear, or the apron may 5 be lifted by the lever if it is desired to operate the device from the inside.

Secured to rock-shaft 19 or to one of arms 20 is an upwardly-extending tilting arm 24:, adapted to throw the arm 14: forwardly and 9 tilt the gear-yoke 13. When this is done, pinion 12 is thrown into mesh with rack 15 as the elevator descends, coming into limiting contact with abutment 17. Rotary motion is instantly communicated to pinion 11, which feeds the threaded bolt 6 inwardly and draws its clamping extremity against the cable 2 with such force as to create a braking friction, which steadily increases until the car is checked.

The yoke 13 is provided at its inner side with a socket 9, into which the turned-in end of bolt 6 will enter when the pinion 12 is thrown into engagement with the rack and the bolt drawn forward by the threaded engagement of pinion 11. When the elevatorcar is reversed after being stopped, pinion 12 will thus be held into engagement with rack 15 until the backward rotation of pinion 11 feeds the bolt back and loosens the grip on the cable, thus disengaging the turned-in extremity of bolt 6 from socket 9, allowing yoke 13 to drop.

In Fig. 7 have shown an arrangement wherein a supplemental bolt 6 is provided, having a pinion 11 in mesh with pinion 11, the construction otherwise being the same, thus providing a double clamping-brake. It will be obvious that three or more clamps may be similarly provided with an intermeshing train of pinions, care being taken that the bolts be threaded alternately right and left.

In Fig. 8 the yoke 13 is provided with a latch 25, adapted to be engaged by a hook extension 26, secured to rock-shaft 19, while the yoke is provided with a counterweight 27, adapted to throw the outer pinion 12 up into engagement with the rack when the latch is released. If desired, the floor of the elevator may be perforated, so as to facilitate the draft of air and allow the apron to rise without cushioning behind it.

The operation will be readily understood from the foregoing description. The device is very simple in construction, effective in operation, not liable to get out of order, and will be found. to accomplish the objects in view in a certain and reliable manner.

Having described my invention, what I claim is 1. In combination with a fixed cable and a fixed actuating device, an elevator-car provided with means for engaging the cable and means operated by pneumatic pressure dependent on the speed of travel of the car for making operative contact with the fixed actuating device, substantially as set forth.

2. In combination with a fixed supportand a rack, an elevator-car provided with means for engaging the support and a device adapted to engage the rack, and actuate said means, made operative by a sudden increase of airpressure, substantially as set forth.

3. In combination with a fixed support and a rack, an elevator-car provided with means for engaging the support and a device adapted to engage the rack, with a wind-pressure apron connected therewith, substantially as set forth.

4. In combination with a fixed cable and a rack, an elevator-car provided with means for engaging the cable and rack, substantially as set forth.

5. In combination with a fixed cable and a rack, an elevator-car provided with braking means for engaging the cable, and means for automatically engaging the rack to actuate said braking means, upon excessive downward speed, substantially as set forth. I

6. In combination with a fixed cable and a rack, an elevator-car provided with means for engaging the cable and rack and a wind-pressure apron adapted to throw said means into engagement, substantially as set forth.

7 In combination with a fixed cable and a rack, an elevator-car provided with a bearingbar, a clamp mounted therein surrounding the cable, and a gearing adapted to be thrown into engagement with the rack and to apply pressure to the clamp, substantially as set forth.

8. In combination with a fixed cable and a rack, an elevator-car provided with a bearingbar, a clamp mounted therein surrounding the cable, gearing adapted to be thrown into engagement with the rack and to apply pressure to the clamp, and a Wind-pressure apron adapted to effect said engagement, substantially as set forth.

9. An elevator safety-lock consisting of a fixed cable and a rack, a clamping-bar, a clamp mounted therein provided with a threaded extremity, a threaded pinion, a tilting yoke carrying a rack-pinion in engagement therewith, and a pivoted wind-pressure apron adapted to tilt the yoke and throw the gearing into engagement with the rack, substantially as set forth.

10. An elevator safety-lock consisting of a fixed cable and rack, a clamping-bar, a clamp mounted therein provided with a threaded extremity, a threaded pinion, a tilting yoke carrying a rack-pinion in engagement therewith and a pivoted wind-pressure'apron adapted to tilt the yoke and throw the. gearing into engagement with the rack, with a limiting-support for the apron, substantially as set forth.

11. An elevator safety-lock consisting of a fixed cable and rack, a clamping-bar, a clamp mounted therein provided with a threaded extremity, a threaded pinion, a tilting yoke carrying a rack-pinion in engagement therewith, and a pivoted wind-pressure apron adapted to tilt the yoke and throw the gearing into engagement with the rack, with a lifting-arm adapted to support the apron, substantially as set forth.

12. An elevator safety-lock consisting of a fixed cable and rack, a clamping-bar, a clamp mounted therein provided with a threaded extrernity, a threaded pinion, a tilting yoke 6&1:- rying a rack-pinion in engagement therewith, and provided with a locking-socket adapted to be engaged by the clamp-terminal and a pivoted Wind-pressure apron adapted to tilt the yoke and throw the gearing into engagement with the rack, substantially as set forth.

In testimony whereof I aifix my signature in presence of two Witnesses.

ANDREW WHELAN.

Witnesses:

JAS. J. MOAFEE, C. M. CLARKE.