Brakes – Wheel – Axially movable brake element or housing therefor
Patent
1977-03-21
1978-08-22
Halvosa, George E. A.
Brakes
Wheel
Axially movable brake element or housing therefor
92 50, 92130R, 188 723, 188 729, 188153D, F16D 5526
Patent
active
041082850
ABSTRACT:
Pneumatic caliper brake actuator having diaphragm, piston member and cylinder body. Cylinder body has outer portions having clearance recesses therein to accept the outer ends of arms carrying brake shoes. At least two return compression springs extend between the piston member and outer portion of cylinder body, the springs having outer ends straddling the clearance recess and inner ends against piston member to retract piston when fluid pressure is reduced. The clearance recesses are hollow projections positioned off-center and symmetrically relative to outer portion of cylinder and spaced apart to accept arm outer end therebetween and accept outer ends of the return springs therein to restrict lateral movement of springs. Overall dimension across outer faces of projections on opposite sides of the cylinders is approximately equal to an overall dimension across the outer portions of the opposed arms. This results in extreme outer portions of moving portions of the caliper being generally within planes containing fixed portions of the caliper, resulting in an overall dimension across outer ends of the arms being less than would be possible with a single spring as used in prior art cylinders.
REFERENCES:
patent: 1936602 (1933-11-01), Karg
patent: 2228818 (1941-01-01), Eksergian
patent: 2830681 (1958-04-01), Schilling
patent: 2942507 (1960-06-01), Fischer et al.
patent: 3815471 (1974-06-01), Kobelt
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