Drum-type service and emergency brake

Details Drum-type service and emergency brake Drum-type service and emergency brake

1974-12-10

1977-02-15

Blix, Trygve M.

Brakes

Wheel

Transversely movable

188 727, 188106F, 188250G, F16D 5300

Patent

active

040078132

ABSTRACT:
A drum-type brake adaptive to front and rear-axle constructions on motorized vehicular equipment, in which braking torques are developed by one or more radially-operating caliper units positioned around the circumference of an open brake drum co-rotatable with the vehicle road wheel. The caliper unit comprises an inner and an outer segmental brake shoe which carry detachable linings, respectively, in spaced confronting relationship that straddle-mount the drum's flange to apply braking forces to opposite faces, respectively, thereof, and reciprocative mechanism including a pair of interengaging push-pull members projecting from the brake shoes, respectively, and slidably installed along the radius of the drum's backing plate. A double-acting cam-lever operably incorporated in the mechanism between the pair of members to mechanically separate them thus drawing the pair of brake shoes toward each other into frictional braking engagement with the drum's flange to effect normal service braking under action of pressurized fluid against a piston mechanically-connected to operate the cam-lever, and installed in a horizontal wheel-cylinder tangentially-oriented integrally or separately with respect to the peripheral margin of the axle-bearing retainer (flange), and to effect emergency (parking) brake operations under manual force exerted on a control mechanically-connected to operate the cam-lever at will independently of or in cooperation with pressurized fluid actuation thereof. The brake shoes include a mechanism for facilitating lining replacement without dismantling or demounting the caliper unit.

REFERENCES:
patent: 1711321 (1929-04-01), McNelles
patent: 3159245 (1964-12-01), Dotto
patent: 3388776 (1968-06-01), Burnett
patent: 3853207 (1974-12-01), Rist

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