Brakes – Operators – Spring
Patent
1996-05-14
1998-10-06
Oberleitner, Robert J.
Brakes
Operators
Spring
188 111, 303 71, 92130A, F16D 6512
Patent
active
058163719
ABSTRACT:
An apparatus for maintaining hydraulic pressure in a spring applied hydraulicly released brake actuator and activating a parking brake light upon stroking the actuator to apply the parking brake in the system, the apparatus including a housing, a compression spring axially aligned in the housing, a cap mounted on one end of the housing, a cylinder formed in the cap, a piston mounted in the cylinder, a spring cup operatively connecting the piston to the compression spring, the piston rod being operatively connected to the piston and to the brake, a tubular housing having a magnetic switch at each end axially aligned with the piston rod, and a cylindrical tube having a magnet mounted thereon aligned with the tubular housing for actuating one or the other of the magnetic switches, one of the switches being actuated on a drop of pressure in the system and the other switch being operatively connected to a parking brake light to signal a loss of pressure in the system and actuation of the parking brake. In an alternate embodiment of the switch assembly a cylindrical magnet is centered in the cylindrical member and axially aligned with an actuating rod, a pair of switches are mounted in axial alignment in the cylindrical member with sufficient clearance between the actuating rod and the cylindrical magnet to allow for a large angular movement while maintaining close magnet to switch proximity throughout the full stroke of the rod.
REFERENCES:
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patent: 3964794 (1976-06-01), Scholz
patent: 3977304 (1976-08-01), Meissner
patent: 3985210 (1976-10-01), Hodge et al.
patent: 4458791 (1984-07-01), Schneider et al.
patent: 4550953 (1985-11-01), Bartholomew
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patent: 5033592 (1991-07-01), Metzelfeld
patent: 5118165 (1992-06-01), Latvala
patent: 5558411 (1996-09-01), Kanjo et al.
Buckley James A.
Conine Daniel B.
Dimsey James J.
Kent Terry L.
Hayes Industrial Brake, Inc.
Oberleitner Robert J.
Schwartz Chris
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