US707442A

US707442A - Brake for motor-shafts or elevators.

Info

Publication number: US707442A
Application number: US9710202A
Authority: US
Inventors: Edward W Moon
Original assignee: Individual
Current assignee: Individual
Priority date: 1902-03-07
Filing date: 1902-03-07
Publication date: 1902-08-19
Anticipated expiration: 1919-08-19

Description

No. 707,442. Patented Aug. l9, I902.

E. W. MOON.

BRAKE FOR MOTOR SHAFTS OF ELEVATORS. (Application filed Mar. 7. 1902.)

(N0 Model.)

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NTTnn STaTns PATENT FFICE.

EDWARD W. MOON, OF ST. LOUIS, MISSOURI.

BRAKE F0 R MOTOR-S HAFTS OF ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 707,442, dated August 19, 1902. Application filed March 7,1902. Serial No. 97,102. (No model.)

To all whom it may concern:

Be it known that I, EDWARD 1N. MOON, a citizen of the United States, residing in the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Brakes for Motor-Shafts of Elevators, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to a brake mechanism for controlling the rotation of the shafts of motors used in furnishingpower for the operation of elevators.

The invention consists in features of novelty hereinafter fully described, and pointed out in the claims.

Figure I is a view in side elevation of my brake. Fig. 11 is an end view of the brake. Fig. III is a perspective view of two of the opposing cam members shown separated. Fig. IV is an enlarged detail vertical sectional view of one of the outer cam members and a portion of the engaginginner cam member and the adjustment and jam nuts.

1 designates the shaft of a motor, on which is rigidly mounted a brake-wheel 2.

3 designates friction-brake straps located at the face of the rim of the brake-wheel 2, so as to be capable of movement to and contact with the rim of said wheel. The straps 3 are attached to a pair of hinge-arms 4c, pivotally supported on a stud 5, projecting from a hanger 6. Fixed to the lower ends of the straps 3 are inner cam members 7, each of which is provided with a pair of inclined camfaces 8, that lead from and to the longitudinallfr-extending straight faces 9. (See Fig. III.

10 is a rock-shaft that passes loosely through the inner cam members 7 and has positioned upon it between the two cam members an eX- pansible coil-spring 11, the energy of which is exerted to hold the inner cam members outwardly away from each other. The rock-shaft 10 is loosely mounted in bearings 12.

13 designates outer cam members provided interiorly with grooves 14 and mounted 011 the rock-shaft 10 in opposition to the inner cam members 7. The cam members 13 are each provided with inclined cam-faces 15, that lead from and to horizontal straight faces 16, the

faces 15 and 16 being adapted for engagement with the faces 8 and 9 of the inner cam membore 7. The cam members 13 are each slidably mounted on the rock-shaft 10, but are held from rotation thereon by a feather 10, (see Fig. IV,) that is seated in the groove 14: of the cam member, so that the outer cam members are capable of rotation only with the rock-shaft 10. The shaft 10 is provided with threaded portions 10", on which are adjustment-nuts 17, held by jam-nuts 18. The adjustmentnuts 17 are adapted for movement to and from the outer cam member 13 to carry said cam members and also the inner cam members 7 inwardly on the rock-shaft toward each other for the purpose of causing the brake-straps 3 to occupy a position closer to or more remote from therim of the brakewheel 2.

19 is a rocker-arm carried by the rock'shaft 10 and to the outer end of which is pivotally connected a throw-bar 20. The throw-bar 20 is pivoted to the drum 21, that receives the shifter-rope 22, by which the movement of an elevator is governed.

In the practical use of the brake when the shifter-rope 22 is moved in the operation of the elevator driven by the motor to which the brake is applied the drum 21 is rocked, which causes the throw-bar 20 to be moved, as indicated by dotted lines, Fig. 11. In such movement of the throw-bar the rocker-arm 19 is elevated in setting the brake and the rockshaft 10 is rotated in its bearings. On the rocking of the shaft 10 the outer cam memhere 13 are movedtherewith, causing the inclined faces 15 of said cam members to ride in contact with the inclined faces 8 of the inner cam members 7 in such manner that the extremities of the inclined faces are brought toward each other and the inner cam members are forced inwardly toward each other, therebycarrying the brake-straps 3 to the rim of the brake-wheel 2 to securethe braking action upon said brake-wheel. On the reverse movement of the shifter-rope the rockshaft 10 is returned to its normal position, and with it the outer cam members 13, and the inner cam members are forced outwardly into their normal position by the expansible spring 11, located on the rock-shaft between them.

I claim as my invention 1. In a brake of the class described, the combination With a brake-wheel, of a pair of brake-straps located at the rim of said wheel, a rock-shaft, a pair of inner cam members having connection with said brake-straps and through which said rock-shaft passes, and a pair of outer cam members non -rotatably mounted on said rock-shaft and arranged in engagement with said inner cam members, substantially as described.

2. In a brake of the class described, the combination with a brake-wheel, of a pair of brake-straps located at the rim of said wheel, a rock-shaft, a pair of inner cam members having connection with said brake-straps and through which said rock-shaft passes, a pair of outer cam members non-rotatably mounted on said rock-shaft and arranged in engagement with said inner cam members, and an expansible spring located between said inner cam members, substantially as described.

3. In a brake of the class described, the combination with a brake-wheel, of a pair of brake-straps located at the rim of said wheel, a pair of inner cam members having inclined faces and connected to said brake-straps, a

spring located between said inner cam members, outer cam members having inclined faces arranged to engage the inclined faces of said inner cam members, and a rock-shaft passing loosely through said inner cam members and having non-rotative connection with said outer cam members, substantially as described.

4. In a brake of the class described, the combination with a brake-wheel, of a pair of brake-straps located at the rim of said wheel, a pair of inner cam members having inclined faces and connected to said brake-straps, a spring located between said inner cam members, outer cam members having inclined faces arranged to engage the inclined faces of said inner cam members, a rock-shaft passing loosely through said inner cam members and having non-rotative connection with said outer cam members, and means on said rockshaft for adjusting said outer cam members to said inner cam members, substantially as described.

EDWARD W. MOON. In presence of- E. S. KNIGHT, N. V. ALEXANDER.