Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1976-12-16
1978-07-25
Halvosa, George E. A.
Brakes
Wheel
Axially movable brake element or housing therefor
188106P, 188171, 188180, 188187, 192 2, 192103A, 310 77, 318372, F16D 6530, B60T 712
Patent
active
041024443
ABSTRACT:
Rotatable discs are splined on a hub member and alternately arranged with stationary discs secured to the brake housing to form a brake disc assembly. The brake operator assembly is a combination electromagnet release, spring set assembly associated with a pressure plate and operative to selectively move the pressure plate into and out of engagement with the brake disc assembly for braking the assembly against and releasing the assembly for rotation. Primary torque springs are actuable, when the electromagnet is de-energized, for biasing the pressure plate into engagement with the brake disc assembly. Secondary torque springs are held against actuation to so bias the pressure plate by axially movable guide rods which include outer end portions engageable with outer fixed shoulders to hold the guide rods in a latched position. The secondary torque springs are actuated when the end portions of the guide rods are moved or cammed to an unlatched position, i.e. out of engagement with the shoulders. A circuit including an emergency stop switch is provided for deenergizing the electromagnets when the guide rods are cammed to the unlatched position. A governor secured to a hub brake shaft and including radially slidable centrifugally and spring biased camming arms is provided for camming the guide rods to the unlatched position and actuating the secondary torque springs in response to the speed of rotation of the brake disc assembly being reduced to a predetermined lower speed after actuation of the primary torque springs. The camming arms are also operative to cam the guide rods to the unlatched position for simultaneously actuating the primary and secondary torque springs in response to the brake disc assembly rotating at a speed above a predetermined upper or safe limit.
REFERENCES:
patent: 1172917 (1916-02-01), Thomas
patent: 1924320 (1933-08-01), James
patent: 1969435 (1934-08-01), Thurston
patent: 2833975 (1958-05-01), Currie
patent: 2964137 (1960-12-01), Luedtke et al.
patent: 3172626 (1965-03-01), Haber et al.
patent: 3830344 (1974-08-01), Cervenec et al.
patent: 3999634 (1976-12-01), Howell
Halvosa George E. A.
Wehr Corporation
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