US1050949A

US1050949A - Safety device for elevators.

Info

Publication number: US1050949A
Application number: US55955910A
Authority: US
Inventors: Joshua J Jones
Original assignee: Individual
Current assignee: Individual
Priority date: 1910-05-05
Filing date: 1910-05-05
Publication date: 1913-01-21
Anticipated expiration: 1930-01-21

Description

J. Jw JONES.

SAFETY DEVIOE FOR ELEVATORS.

APPLICATION FILED MAY 5, 1910.

Patented Jan. 21, 1913.

2 SHEETSSHEET 1,

WITNESSES Q/ m N u J. J. JONES.

SAFETY DEVICE FOR ELEVATORS.

I APPLICATION FILED MAY 5, 1910. 1,050,949.

Patented Jan. 21, 1913.

2 SHEETS-SHEET 2.

WITNESSES I? TOR I W Am- UNITED 3TATEL$ PATENT @FFTQE.

JOSHUA J. JONES, OF PITTSBURGH, PENNSYLVANIA.

SAFETY DEVICE FOR ELEVATORS.

Application filed. May 5, 1910.

To all whom it may concern Be it known that I, JOSHUA J. JoNEs, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Safety Devices for Elevators, of which the following is a specification.

This invention relates to elevators and the principal object of the invention is to provide an improved safety device for antomatically stopping or checking the speed of an elevator car whenever the operator loses control of the car, and the car starts to run away.

In the accompanying drawings; Figure 1 is a diagrammatic elevation of an elevator car showing my improvement applied thereto; Fig. 2 a side elevation on an enlarged scale of one of the improved safety devices shown in Fig. 1; Fig. 3 a front elevation thereof; Fig. 4 a detail of construction employed in connection with the safety device; Fig. 5 a central sectional view of the automatic operating means for said safety device; and F ig. 6 a side elevation thereof.

According to the referred form of my invention a suitable a1r compressor or pump 1 is secured to the under side of the elevator car 2, preferably one on each side adjacent to the elevator guides 3. "As shown more clearly in Fig. 3 the compressor may be of the ordinary standard type comprising a piston 4 connected to a crank shaft by connecting rod 6. On one end of the crank shaft 5 is secured a gear 7 adapted to mesh with a pinion 8 carried on one end of a supporting arm 9, the parts being so located that the pinion 8 is adapted to swing into and out of mesh with a rack 10 secured to the usual guide rail 3.

The crank shaft 5 is supported in journals l2 and on the shaft intermediate the gear 7 and one of said journals the supporting arm 9 is mounted. On the under side of the ear, rearwardly of the compressor 1 is secured a spring cage 13 containing a heavy coil spring 16 adapted to act on a rod 14 having a forked end for engagement with a projecting end of the pinion shaft 15, as shown in detail in Fig. 4. The spring 16 tends to pull up on the rod 14 and thereby eflect the rotation of the arm 9 so as to bring the pinion 8 into mesh with the rack 10.

The arm 9 is provided with an operating Specification of Letters Patent.

Fatented J an. 21, 1313.

Serial No. 559,559.

lever 17, the outer end of which is connected by means of a small flexible cable 18 passing over guide pulleys l9 and 20 respectively, to a point on the main supporting cables 21 of the elevator car. This cable 18 may be connected directly to the car cables, but preferably a carrying device is provided such as shown in detail in Figs. 5 and 6 and comprising an outer casin 22 adapted to be firmly fastened to the car cables 21, an inner casing 23, and a coil spring 24 interposed between the two casings and tending to push the casing 23 out of the casing 22. The safety cable 18 passes over a pin 25 carried by the casin 23 and normally the casing 23 is held in position within the casing 22 against the tension of the spring 24 by means of a trip arm 26, one end of which is adapted to project out under the base of the casing 23 and the other end of which is normally in engage ment with a pin 27 mounted on a pivoted lever 28, so that when the trip arm 26 engages the pin 27, the casing 23 is held within the casing 22. The lever 28 projects out to the side of the car and is adapted to engage an obstruction 29 on a cable 30.

The compressors 1 are each provided with the usual inlet valve 31 and outlet valve 32 and the outlet passage 33 of each is connected to a common pipe 34 which may be extended up through the floor of the car and preferably is provided with a valve or cook 35 adapted to open or close communication through the pipe 34 or to vary the size of the outlet therethrough.

The cable 18 is normally pulled up so as to compress the spring and maintain the pinion out of engagement with the rack 10 as shown in Fig. 2, and during the ordinary running of the car the compressors remain inactive. Should the cables 21 break, the cable 18 is slackened and the spring 16 thereupon exerts its force to shift the pinion 8 into engagement with the rack 10.

The compressor piston 4 is thereupon set into motion and the compression of fluid takes place in proportion to the speed at which the car is descending. If it is desired that the car be brought to a complete stop, the outlet pipe 34 is maintained closed, but often the car will be stopped at a point intermediate two floors and in order to permit a certain control of the movement of the car, the cock 35 may be manipulated to allow more or less exhaust of air from the outlet pipe 34. It will be evident that by adjusting the cock to vary the outlet opening the car may be controlled as desired.

In addition to the automatic control of the car in case of the cables breaking, means are provided for setting the compressors into action when the speed ofthe car exceeds a certain desired degree. According to this means I make use of a governor arrangement heretofore employed in connection with elevators in which a cable running over sheaves at the top and bottom of the elevator shaft is adapted to operate a centrifugal governor, the governor being adapted upon the speed of the cable exceeding the desired degreeto stop the movement of the cable. The cable 30 shown in Fig. 1 is such a cable and it will be seen that in case the speed of the car exceeds a certain degree the cable is stopped and the obstruction 29 thereon then operates the lever 28 to trip the arm 26 and thereby permit the casing 23 to drop. The cable 18 is thus released and the compressor gears are thrown into action.

One compressor has its crank preferably set opposite to the other, so that there will always be one of the compressors pumping air at a time.

Having now described my inyention, what I claim as new and desire to secure by Letters Patent, is

1. In a safety device for elevators, the combination witlran elevator car, of a fluid compressor adapted to be operated by the momentum of the car and normally having its moving parts at rest, means for cutting the compressor into action, and a flexible connection operatively connected to the car operating cable for controlling said means.

2. In a safety device for elevators, the combination with an elevator car, of a fluid compressor carried by the car and adapted to be operated by the momentum thereof, a movable gear device permanently connected to said compressor, a rack located adjacent the car, a spring tending to throw said gear device into engagement with the rack, and a flexible connection attached to the car operating cable for normally maintaining said ear device out of en a ement with the gear device out of engagement with the rack.

3. In a safety device for elevators, the combination with an elevator car and an operating cable therefor, of 'a fluid compressor carried by the car and adapted to be operated by the momentum thereof, a movable train of gears in permanent operative connection with the compressor, a rack mounted adjacent the elevator car, a spring tending to throw said gears into operative engagement with the rack, a lever for oper-. ating said gears, and a flexible cable con nected to said lever and to the car operating cable and adapted to normally maintain the gears out of engagement with the rack against the tension of said spring.

4:. In a safety device for elevators, the combination with an elevator car, of a fluid compressor adapted to be operated by the momentum of the car, a rack, a gear nor-- mally maintained out of engagement with said rack for operating said compressor and means governed by the speed of the car for effecting the engagement of the gear with the rack to thereby out said compressor into action.

5. In a safety device for elevators, the combination with an elevator car, of a fluid compressor adapted to be operated by the momentum of the car, a transmission mechanism for imparting movement to the com-- pressor, means normally maintaining said mechanism inactive, and a device operated upon excessive speed of the car for causing the transmission mechanism to operate, thereby operating said compressor.

6. In a safety device for elevators, the combination with an elevator car, of a fluid compressor adapted to be operated by the momentum of the car, mechanism for transmitting motion to said compressor, a memher for throwing said mechanism into and out of action, a trip device normally maintaining said member in position with said mechanism out of action, and means governed by the speed of the car for controlling said member.

7. In a safety device for elevators, the combination with an elevator car, of a trip device comprising two members, an intermediate spring, and a trip lock device,normally holding said members together against the tension of the spring, a fluid compressor adapted to be set in motion by one of said members for effecting the retardation of the car, and means governed by the speed of the car for controlling said trip lock device.

In testimony whereof I have hereunto set my hand.

JOSHUA J. JONES.

WVitnesses:

WM. M. CADY, A. M. CLEMENTS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.