US837961A - Elevator safety-brake. - Google Patents

Description

EATENTEEEEE. 11, 1906.

0. PRICE. ELEVATOR SAFETY BRAKE.

APPLICATION FILED DEG-16,1905.

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In Fer/Z01, Claude Jm'ae /iinesses:

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No. 837,961. PATENTED DEC. 11, 1906.

0. PRICE;

ELEVATOR. SAFETY BRAKE.

APPLICATION FILED DEC. 16. 1906.

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UNITED STATES PATENT OFFICE.

CLAUDE PRICE. OF KANSAS CITY, MISSOURI, ASSIGNOR OF ONE-HALF TO G. E. GLEASON, OF KANSAS CITY, MISSOURI.

Specification of Letters Patent.

Patented Dec. 11, 1906.

Application filed December 16, 1905. Serial No. 291.966.

T at whom it may concern:

Be it known that I, CLAUDE PRICE, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Elevator Safety-Brakes, of which the following is a specification.

My invention relates to improvements in safety-brakes for elevator cars or cages; and one of my objects is to provide a device of this character which may be operated from the interior of the car, so that the latter may be stopped and reliably held at any point in the elevatorshaft.

A further object is to provide means for setting the brakes when any of the gates leading to the shaft are thrown open and for holding said brakes in a set position until the gate is closed, so that all accidents arising from the car starting While passengers are entering or leaving the same will be obviated.

The device is equally adaptable for use on passenger, freight, and mine cars, and gives the operator within the car complete control over the movements of the latter, so that he need not depend upon the automatic safety appliances with which elevator-cars are usually equipped in case of an accident.

The invention consists in the novel construction, combination, and arrangement of parts hereinafter described, pointed out in the claims, and illustrated in the accompanying drawings, and in order that it may be fully understood reference will now be made to said drawings, in which Figure 1 represents a broken vertical section, taken on line I I of Fig. 2, of a car provided with my improved safety-brake. Fig. 2 is an inverted plan view of same. Fig. 3 is a vertical section, taken on line III III of Fig. 2, of a rectangular frame containing the dogs forming part of my invention. Fig. 4 is an enlarged vertical section of a shoe and means for adjusting same.

In said drawings, 1 designates an elevatorshaft provided at its opposite sides with the customary standards 2 and guide-strips 3.

4 designates a car adapted to traverse the shaft in the usual manner and provided with an opening 5 for the ingress and egress of passengers or freight.

6 designates a gate arranged to slide in the usual manner when it is desired to open or close the gateway 7, leading into the elevatorshaft. Gate 6 is provided at its inner side with a pair of parallel bars 8 8 spaced a suitable distance apart and arranged in a perpendicular position, the ends 9 of said bars flaring in opposite directions for a purpose hereinafter described.

10 designates a pair of rectangular frames having inward extensions 11, which snugly fit the sides and under surface of one of the floor-beams 12 of the car, to which they are reliably secured by bolts 13. Frames 10 are provided at their outer sides with centrallydisposed vertical openings 10 for the admission of guide-strips 3. Each frame is provided with two sets of dogs 14 15, adapted to simultaneously engage the opposite sides of guide-strips 3 when it is desired to stop the car. Said dogs are pivotally mounted upon pins 16, extending transversely through frames 10, and have eccentric faces 17. Consequently if the dogs are thrown into engagement with guide-strips 3 when thecar starts to ascend with abnormal speed dogs 1-4 Will grip said guide-strips with lncreasing force as the high radii of their eccentrics rotate into contact with the strips. Likewise dogs 15 will check the movement of the car should the latter start to fall. The faces of the dogs are slightly roughened, as indicated at 18, to prevent them from slipping upon the guide-strips, and by arranging the dogs at opposite sides of the latter, as shown in Fig. 3, they will not bend or break said strips when thrown into engagement therewith, owing to the pressure being equal on both sides thereof. The dogs are provided with arms 19, having longitudinal slots for the reception of studs 21, projecting from the cross-heads of T-shaped levers 22, fulcrumed upon pins 23, extending transversely through frames 10. The lower ends of levers 22 are pivotally secured to Y-shaped members 24, comprising a pair of push-bars 25,

ivotally secured at their upper ends to the l ower terminals of a pair of oppositely-extending arms 26, pivotally secured at their upper ends to the levers 22.

Push-bars 25 are pivotally secured at their lower terminals to a pair of short links 27, pivotally secured at their lower terminals to the lower ends of a pair of bell-crank levers 28, pivotally secured to a pair of brackets 29, depending from a pair of arms 30, integral with the extensions 11 and provided at their lower ends with eyes 31, through which the push-bars extend. The upper ends of bellcrank-levers 28 are pivotally secured to the outer terminals of two connectingrods 32, pivotally secured at their inner terminals to the oppositely-disposed crank members 33,

forming part of a crank-shaft 34, journaled in hangers 35, secured to the floor-beams 12.

36 designates a crank-arm fixed to the crank-shaft near the forward end of the latter and provided with a pivotally-secured controlling-bar 37, extending upwardly through an opening in the floor of the car adjacent to opening 5, so that said controlling-bar will be within convenient reach of the operator. Controlling-bar 37 is provided at its lower portion with a stirrup 38 and at its upper end with a handle 39, so that it may be operated by either foot or hand power. Thus should the cables or motive power which suspend and operate the car get out of order the latter can be stopped at any desired point by deressing the controlling-bar. Said controling-bar is normally held in an elevated position by means of a retractile spring and provided with a collar 41, which engages the under side of the car-floor, and thus limits the upward movementof said bar. Spring 40 is attached at its ends to the free terminal of crank-arm 36 and an eye 42, secured to the car-floor. Said spring, in addition to holding 'the controlling-bar in an elevated position,

reliably holds the dogs out of engagement with guide-strips 3 until said bar is depressed. 43 designates a lever fixed to the forward end of shaft 34 and provided at its free end with an antifriction-roller 44, which passes between the parallel bars 8 8 when the car is ascending or descending. When the car is stopped opposite said gate and the latter is drawn open in the direction indicated by arrow a, bar 8 will contact with said roller and move the end of lever 43 in the direction indicated by arrow 1), so that said lever through the instrumentality of the intervening mechanism will throw the dogs into engagement with the guide-strips 3, and thus reliably lock the car from either upward or downward movement until the gate is closed. When the latter operation takes place, bar 8 will contact with the roller and throw the lever to its normal position, so that it will restore the dogs and the intervening mechanism to their normal position. By flaring the ends of the parallel bars roller 44 will not be injured should it contact with one of said ends while the car is ascending or descending, but will be directed to the space between said bars should the gate be left slightly open.

The lower portion of the car is prevented from vibrating by shoes 45, arranged at opposite sides of the guide-strips 3 and adjustably secured to strips 46, extending across the upper and lower edges of frames 10 by adjusting-screws 47 and bolts 48, which latter ex- From the above description it is apparent that I have produced a safety-brake for elevator-cars which is simple and durable in construction and thoroughly reliable for the purpose intended, and while I have shown the preferred form I of course reserve the right to make such changes as properly fall within the spirit and scope of the appended claims.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a safety-brake of the character described, the combination with an elevatorshaft, guide-strips arranged therein, and a car arranged to traverse said shaft, of frames secured at opposite sides of said car, eccentricshaped dogs pivotally mounted in said frames and adapted to engage the guide-strips, T- shaped levers connected to the dogs, and manually-operated mechanism for simultaneously operating said levers when it is de sired to throw the dogs into and out of engagement with the strips.

2. In a safety-brake of the character described, the combination with an elevatorshaft, guide-strips arranged therein, and a car arranged to traverse said shaft, of frames secured at opposite sides of said car, eccentric-shaped dogs pivotally mounted in said frames and adapted to engage the guidestrips, T-shaped levers connected to the dogs for simultaneously operating the latter, a Y shaped member connected at its forked terminals to the T-shaped levers, and manually-operated means for controlling said Y-shaped member.

3. In a safety-brake of the character de scribed, the combination with an elevatorshaft, guide-strips arranged therein, and a car arranged to traverse said shaft, of frames secured at opposite sides of said car, eccentric-shaped dogs pivotally mounted in said frames and adapted to engage the guidestrips, T-shaped levers connected to the dogs for simultaneously operating the latter, a Y- shaped member connected at its upper forked terminals to the T-shaped levers,a push-bar secured to one end of said member, and manually-operated mechanism for controlling said push-bar.

4. In a safety-brake of the character described, the combination with an elevator shaft, guide-strips arranged therein, and a car arranged to traverse said shaft, of frames secured at opposite sides of the car, eccentric-shaped dogs pivotally mounted in said frames and adapted to engage the guidestrips, T-shaped levers connected to the dogs for simultaneously operating the latter, a Y- IIO scribed, the combination with an elevatorshaft, guide-strips arranged therein, and a car arranged to traverse said shaft, of frames secured at opposite sides of the car, eccentric-shaped dogs pivotally mounted in said frames and adapted to engage the guidestrips, T-shaped levers connected to the dogs for simultaneouslyoperating the latter, a Y

shaped member connected at its upper forked terminal to the T-shaped levers, a push-bar secured to one end of said member, a link connected to the push-bar, a bell-crank lever pivotally secured to said link; and means for operating said bell-crank lever.

'6. In a safety-brake of the character described, the combination with an elevatorshaft, guide-strips arranged therein, and a car arranged to traverse said shaft, of frames secured at opposite sides of the car, eccentric-shaped dogs pivotally mounted in said frames and adapted to engage the guidestrips, T-shaped levers connected to the dogs for simultaneously operating the latter, a Y-shaped member connected at its upper forked terminal to the T-shaped levers, a push-bar secured to the other end of said member, a link connected to the push-bar, a bell-crank lever pivotally secured to said link, a crank-shaft, a connecting-rod secured at its opposite ends to the bell-crank lever and said crank-shaft; and means for operating said crank-shaft.

7 .In a safety-brake of the character de scribed, the combination with an elevator shaft, guide-strips arranged therein, and a car arranged to traverse said shaft, of frames secured at opposite sides of the car, eccentrio-shaped dogs pivotally mounted in said frames and adapted to engage the guidestrips, T-shaped levers connected to the dogs for simultaneously operating the latter, a Y-shaped member connected at its upper forked terminal to the T-shaped levers, a push-bar secured to the other end of said member, a link connected to the push-bar, a bell-crank lever pivotally secured to said link, a crank-shaft, a connecting-rod secured at its opposite ends to the bell-crank lever and said crank-shaft, means for operating said crank-shaft, a crank-arm fixed to said crank-shaft, and a spring attached at its opposite ends to said crank-arm and the car.

8. In a safety-brake of the character described, the combination with an elevator shaft, guide-strips arranged therein, and a car arranged to traverse said shaft, of frames secured at opposite sides of the car, eccentricshaped dogs pivotally mounted in said frames and adapted to engage the guide-strips, T-

shaped levers connected to the dogs for simultaneously operating the latter, a Y- shaped member connected at its upper forked terminal to the T-shaped member, a push-bar secured to the other end of said member, a link connected to the push-bar, a bell-crank lever pivotally secured to said link, a crank-shaft, a connecting-rod secured at its opposite ends to the bell-crank lever and said crank-shaft, means for operating said crank-shaft, a crank-arm fixed to said crank-shaft, a spring attached at its opposite ends to said crank-arm and the car, and a controlling-bar connected to the crank-arm and extending into the car.

9. In a safety-brake of the character described, the combination with an elevatorshaft, guide-strips arranged therein, and a car arranged to traverse said shaft, of frames secured at opposite sides of the car, eccentrio-shaped dogs pivotally mounted in said frames and adapted to engage the guidestrips, T-shaped levers connected to the dogs for simultaneously operating the latter, a Y-shaped member connected at its upper forked terminal to the T-shaped levers, a push-bar secured to the other end of said member, a link connected to the push-bar, a bell-crank lever pivotally secured to said link, a crank-shaft, a connecting-rod secured at its opposite ends to the bell-crank lever and the crank-shaft, means for operating said crank-shaft, a crank-arm fixed to said crank-shaft, a spring attached at its opposite ends to said crank-arm and the car, a controlling-bar connected to the crank-arm and extending into the car, a stirrup forming partof said controlling-bar, and a handle in tegral with the upper end of said bar.

10. In a safety-brake of the character described, the combination with an elevatorshaft having a gateway, a gate for normally closing said gateway, guide-strips arranged in said shaft, and a car arranged to traverse said shaft, of dogs carried by the car and arranged to simultaneously engage the strips, a lever, suitable mechanism connecting said lever to the dogs whereby the latter are controlled through the operation of said lever, a member attached to the gate for contacting with and moving the free end of the lever when said gate is opened, and another'member secured to said gate for contacting with and operating the lever when the gate is closed.

In testimony whereof I aflix my signature in the presence of two witnesses.

CLAUDE PRICE.

Witnesses:

F. G. FISCHER, J. MooRE.

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