Spring-applied dual coil brake

Details Spring-applied dual coil brake Spring-applied dual coil brake

1996-12-12

1997-12-23

Butler, Douglas C.

Brakes

Operators

Spring

188158, 310103, H02K 4900, B60T 1304

Patent

active

056998830

ABSTRACT:
A variable electric brake assembly applies braking force to the wheel of a materials handling vehicle through a rotor shaft. A brake rotor rotates on the rotor shaft and is located within the brake assembly. When the vehicle is in a parked position, both an inner coil and an outer coil are de-energized. With the inner coil de-energized, an inner armature is not attracted to the inner coil, and the inner armature is forced against the brake rotor by springs to prevent the rotation of the brake rotor. When the vehicle is moving in a free running position, the outer coil remains de-energized while the inner coil is energized. With the inner coil energized, the inner armature is attracted to the inner coil and overcomes the force of the springs, thereby allowing the brake rotor to freely rotate. When the vehicle undergoes dynamic braking, both the outer coil and the inner coil are energized. When the outer coil is variably energized, the outer armature is variably attracted to the outer coil to apply a variable dynamic braking force to the brake rotor.

REFERENCES:
patent: 2292704 (1942-08-01), Lilliquist
patent: 2729310 (1956-01-01), Tourneau
patent: 3665231 (1972-05-01), Weudler
patent: 3752267 (1973-08-01), Dovell et al.
patent: 4049089 (1977-09-01), Rundle
patent: 4156478 (1979-05-01), Kroeger
patent: 4567967 (1986-02-01), Crosswair
patent: 5057728 (1991-10-01), Dammeyer et al.
patent: 5154261 (1992-10-01), Tanaka et al.

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