Title:
BRAKE DEVICE
Document Type and Number:
Japanese Patent JPS54123665
Kind Code:
A
Abstract:
PURPOSE:To obtain suitable braking force of a brake device applied for the safety brake of a hoist or the like by preventing the braking force from becoming excessive. CONSTITUTION:When a suspended load is dropped to accelerate the rotating speed of a motor shaft 2A, centrifugal pieces 10A to 10C are projected against wheel springs 12A, 12B to make contact with the cylindrical portion 19A of the brake shoe 19. Thus, the brake shoe 19 moves to interpose the brake wheel 8 between the brake disks 17 to thereby brake the shaft 2A. In the brake device, there are provided a projection 19D at the collar 19C of the brake shoe 19 and a projection 14A on the inner periphery of the gear case 14 to face with the projection 19D. Thus, the brake shoe 19 is prevented from rotating over predetermined speed by colliding between the projections 19D and 14A so as to thereby prevent excessive braking force from being applied to the shaft 2A.
Inventors:
SHIMODAIRA TOYOHISA
Application Number:
JP3141978A
Publication Date:
September 26, 1979
Filing Date:
March 18, 1978
Export Citation:
Assignee:
HITACHI LTD
International Classes:
B66D5/04; F16D59/00; (IPC1-7): F16D59/00