Brakes – Operators – Spring
Patent
1975-07-07
1977-03-29
Halvosa, George E. A.
Brakes
Operators
Spring
92 18, 92 23, 92 63, 92130A, 192 91R, 303 6M, F16D 6520
Patent
active
040144143
ABSTRACT:
A disc brake comprising a caliper housing having axially aligned first and second cylinder bores; a first piston slidable within the first bore and bearing against one of the friction pads; and a second piston slidable within the second bore and having an internally threaded tubular opening into which a clearance adjuster is screwed. The threads of the adjuster are power transmission threads with a helix angle of about 15 degrees, and there is end-wise clearance between the threads sufficient to allow the first piston to move between its retracted and brakes-applied positions. At the end of the adjuster is a head having a conical clutch facing that engages a corresponding conical seat in the bottom of the first piston, so as to exert a powerful rotational clutch action. A spring urges the adjuster toward the bottom of the first piston, and causes the adjuster to unscrew and extent itself whenever there is any clearance between the clutch facing and seat. The second piston has a plurality of belleville springs bearing against its back side, and when hydraulic pressure is admitted to the two cylinders, the first piston applies the brakes, and the second piston compresses the springs and is then locked in place by a solenoid-operated detent. The solenoid can be de-energized to allow disengagement of the detent and release of the second piston so that the compressed springs can urge the piston in the direction to apply the brakes. The solenoid may be actuated by means of a manually controlled switch, or by operation of a switch in the differential pressure valve due to a failure to one of the hydraulic pressure lines. A second solenoid may be provided to effect partial application of the brakes on a long, downhill grade.
REFERENCES:
patent: 1213363 (1917-01-01), Henry
patent: 3182566 (1965-05-01), Berg et al.
patent: 3422807 (1969-01-01), Waldecker
patent: 3633715 (1972-01-01), Burnett
Durfee Daniel G.
Yamamoto Mayjue A.
Halvosa George E. A.
Kidder Herbert E.
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