US687621A

US687621A - Elevator safety appliance.

Info

Publication number: US687621A
Application number: US5227101A
Authority: US
Inventors: James G Gracey; Alfred Gfeller
Original assignee: POSITIVE ELEVATOR SAFETY Co
Current assignee: POSITIVE ELEVATOR SAFETY Co
Priority date: 1901-03-20
Filing date: 1901-03-20
Publication date: 1901-11-26
Anticipated expiration: 1918-11-26

Description

No. aa7,s2|. A Pa'tented Nqv. 26, 190|.

.1. a. GRACE-v & A. GFELLEn.

ELEvATon SAFETY APPLIANc'E'.

(Application med m. so, 190'1.)

1 (No Model.)

THE cams pasas co.. pHoro-urna. wnsmunrora, 0,1;

4 NTED ,STATES PATENT OFFICE.

JAMES G. GRACEY AND ALFRED GFELLER, OF ST. LOUIS, MISSOURI, ASSICNORS TO POSITIVE ELEVATOR SAFETY COMPANY, OF ST. LOUIS, MISSOURI,

A CORPORATION OF MISSOURI.

ELEVATQR SAFETY APPLIANeE.

SPECIFICATION forming part of Letters Patent No. 687,621, dated November 1901.

Application iled March 20. 1901. Serial No. 523271. (No model.)

To all whom it may concern.- 4

Be it known that We, JAMES Gr. GRACEY and ALFRED GFELLER, citizens of the United States, residingat St. Louis, State of Missouri, have invented certain new and useful Improvements in Elevator Safety Appliances, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a 1o part hereof.

Our invention has relation .to improvements in elevator safety appliances; and it consists in the novell construction andarrangement of parts more fully set forth in the specification and pointed out in the claims.

In the drawings, Figure 1 is a side elevation of our invention with parts broken away, showing also an elevation of the cage or car `and the elevator-shaft. Fig. 2 is a top 2o plan view of the drum and pumps and their connections; and Fig. 3 is a vertical section on line 3 3 of Fig. 1, taken through the pipes leading from the pump-cylinder.

The present invention is an improvement '"25 both on the construction shown in United States Letters I atent granted to us under date of November-20, 1900, numbered 662,264, iand on that disclosed in our pending application, Serial No. 31,690, -iled October l,

.3o l'900,-the new device combining the advantages of both the aforesaid constructions, but

eliminating the objectionable features thereof, among them being the'tendency under or` dinary conditions for the cage to travel un- `35 evenly and sometimes with a jerky motion,

this objection resulting from the reciprocations of the pump-piston actuated by the travel of the cage. In the present device the cage travels evenly under all circumstances.

In detail the invention may be described asY follows:

Referring to the drawings, l represents `an Aelevator-shaft, and 2 the cage or car traveling therein, the pulling-cable being designated 4; by 3. Mounted to one side of the bottom of the shaft is a revolving drum 4, over which are Wound several wraps of a cable 5, one end of which passes over a lower guidingsheave 6 and is connected to the bottom of the elevator-cage, the other end passing over a guiding-sheave 7 at the top of the shaft and connected to the top of the cage to one side of the point of connection of the pulling-cable 3. From the connections described it is apparent that with the upward travel of the cage the latter will draw upon one end of the cable 5 and with the descent of the cage the latter will pull upon the opposite end of said cable 5, thus imparting rotation to the drum at all times. A suliicient number of wraps of the cable 5 are Iirst passed about the drum to prevent slipping of the cable when either end thereof is under tension during the travel of the cage.

Carried by either or both ends of the drumshaft is a crank-arm 8, coupled by a connecting-rod 9 to the piston-rod 10 of an oil-cylinder C, secured to the base-plate of the engine, the Walls of the cylinder being tapped above and below the limits of the pistons stroke by' pipes 11 11', respectively, the opposite ends of said pipes communicating with a vertical pipe l2, communicating with the bottom of an open oil vessel or receiver 13. Communicating with the pipes 11 11 are branch pipes 75 or shunts 14 14', respectively, the opposite ends of said shunts coupling with an oil-discharge pipe l5, communicating with the vessel 13 at a point below'the surface 4of the oil contained therein. The pipes 11 1l are provided at a point exterior to the shunts 14 14 with inwardly-swinging gate-valves 16 1G', respectively, and the shunts are provided with check-valves 17 17', all of ordinary constructions, but shown in section in the drawings. Above the upper shunt the pipe 15 is provided with a regulating valve or cock 18 of the ordinary faucet type, the particular position to which the same has been set determining the rapidity of flow therethrough of the oil forced by the piston of the pumpcylinder into the receiver 13. Beyond the regulating-cock lS-that is, between it and the receiver 13-the pipe 15 is provided with an emergency or pressure-regulating valve 95 19, also of the Well-known construction and shown herein in section.

The operation of the device is as follows: With the travel of the cage in either direction the pump will be set into operation, the roo piston rst driving the oilI in one' direction and then the other, the latter always discharging into the open vessel or receiver 13. With the downward stroke of the piston the gate-valve 16 is forced to a closed position and the gatevalve l6 opens, allowing the oil from the receiver 13 to follow the piston in such downstroke. The oil below the piston is forced through the pipe 1l', shunt 14', past the checkvalve 17', (the valve 17 closing under the circumstances,) through the pipe 15 past the valves 18 and 19, into the receiver v13. With the upstroke of the piston the gate-valve16 is forced to a closed position, the gate-valve 16 opening and allowing the oil from the receiver 13 to follow the piston in such upstroke. The oil above the piston is forced through the pipe 11, shunt 14, past the check 17 (the check 17 closing under the circumstances,) through the pipe 15, past the valves 18 and 19, into the receiver 13. The valve or cock 18 is set or opened sufticien tly to allow for the uninterrupted ow of the oil past it at a rate commensurate with the normal speed of the cage, the emergency-valve 19 being open to its full extent, so as not to interfere with such flow. Should the cage for any reason become overloaded, however, and the valve 18 become insufficient to resist any abnormal fiow under the circumstances, the excess of pressure of .the oil will then tend to partially or wholly close theemergency-valve, (being virtually a pressure-regulating valve,) thus allowing the oil to discharge at a rate which will either check a too-rapid descent of the cage or stop it altogether, thus indicating that the same has been overloaded. The spring of the emergency-valve can be set to any tension, as is obvious.

Jith our present apparatus the'cage is permitted to travel without any perceptible jerks, a uniform and even travel being always insured, one reason for this result being the fact that the oil is always discharged into an open vessel 4and not forced back and forth from one end of the cylinder to the other, as is the case of the construction described in our pending application above referred' to.

It is apparent, of course, that the present device may be used in connection with any character of elevators, hoisting apparatus, inclined railways, and the like. It is further apparent that minor changes may be resorted to without departing from the spirit of our invention.

-Having described our invention, what we claim is 1. In yan elevator safety appliance, a cage or car, a liquid-pump located at a point removed from the cage, a drum mounted in connection with the pump, a cable wound about the drum and having its opposite ends secured to the cage, means for guiding said cable, intermediate connections between the drum and pump for operating the latter upon the travel of the cage in either direction, and a vessel for receiving the liquid operated by the pu' rnp with each stroke of the piston there-` of, substantially as set forth.

2. In an elevator safety appliance,- a cage or car, a liquid-pump located at a point removed from the cage, a drum mounted in connection with the pump, a cable wound about the drum and having its opposite ends secured to the cage, means for guiding said cable, intermediate connections between the drum and pump for operating the latter upon the travel of the cage in either direction, and

an open vessel for receiving th'e liquid operated by the pump substantially as set forth.

3. In an elevator safety appliance, a liquidpum p adapted to beoperated by the cage during its travel in either direction, a vessel for holding and receiving the liquid operated by the pump, a series of pipes leading from the pump-cylinder, one on each side of the limits of the stroke of the piston and connecting with the vessel, a valve in each pipe for permitting the ow of the liquid from the vessel behind the piston during the reciprocations of the latter, a shunt leading from each of the aforesaid pipes, a discharge-pipe communicating with said shunts and with the vessel, check-valves in said shunts, and a regulating valve or cock in said discharge-pipe loL cated at a point between the adjacent check'- valve and vessel, the parts operating substantially as and for the purpose set forth.

4. In an elevator safety appliance, a liquidpump adapted to be operated by the .cage during its travel in either direction, a vessel for holding and receiving the liquid operated by the pump, a series of two pipes leading from the pump-cylinder, one on each side of the limits of the stroke of the piston and communicating with the vessel, a gate-valve in each pipe for permitting the iow of the liquid from the vessel behind the piston during the reciprocations of the latter, a shunt leading from each of the aforesaid pipes, a discharge-pipe communicating with said shunts and with the vessel, check-valves in said shunts, a regulating valve or cock in said discharge-pipe located at a point between the adjacent check-valve and the vessel, and an emergency-valve in the discharge-pipe located between the regulating-valve and the vessel, the parts operating substantially as and for the purpose set forth.

5. In an elevatork safety appliance, a cage vor car, a liquid-pump connected thereto and operated thereby during the travel of the cage `in either direction, and a vessel connected with the pump-cylinder for receiving the liquid operated by the pump with each stroke of the piston, substantially as set forth.

6. In anV elevator safety appliance, a cage or car,a liquid-pump located at a point removed from the cage, a drum mounted in connection with the pump, a cable wound about the drum'and having its opposite ends secured to the cage, intermediate connections between the drum and pump for operating the latter upon the travel of the cage in either loe direction, anda vessel for receiving the liquid operated by the pump, substantially as set forth.

7. In an elevator safety appliance, a cage or car, a liquid-pump located at a point removed from the cage, a drum mounted in connection with the pump, a cable wound about the drum and having its opposite ends secured to the cage, intermediate connections between the drum and pump for operating the latter upon the travel of the cage in either direction, and a vessel for receiving the liquid operated by the pump with each stroke of the piston thereof, substantially as set forth.

8. In an elevator safety appliance, a cage or car, a liquid-pump located at a point re- JAMES G. GRACEY. ALFRED GFELLER.

Witnesses -EMIL STAREK, MARGUERITE SMooT.