Drum brake with automatic adjustment locked at high temperature

Details Drum brake with automatic adjustment locked at high temperature Drum brake with automatic adjustment locked at high temperature

1988-02-08

1989-02-14

Butler, Douglas C.

Brakes

Wheel

Transversely movable

188196B, 188 7955, 192111A, F16D 5152, F16D 6554, F16D 6564, F16D 5120

Patent

active

048040720

ABSTRACT:
The automatic adjustment of a drum brake, when the wear of the friction linings carried by the shoes justifies it, is obtained by way of an adjusting lever (30) mounted pivotally on one (12a) of the shoes and carrying a toothed quadrant (30a), on which a pawl (34) is normally engaged. A spacer connecting the ends of the shoes between which the brake motor is located interacts with the adjusting lever by way of a connection with play. To prevent inopportune adjustment as a result of heating of the drum, a blocking member (52) carried by a metallic strip (50) fastened to the pivot pin (36) of the pawl (34)immobilizes the latter in terms of rotation when the temperature exceeds a certain threshold, thus increasing the functional play.

REFERENCES:
patent: 2147996 (1939-02-01), Smith
patent: 2165076 (1939-07-01), Smith
patent: 2292018 (1942-08-01), Smith
patent: 2570398 (1951-10-01), Smith
patent: 3339678 (1967-09-01), Burnett
patent: 3983970 (1976-10-01), Courbot
patent: 4476963 (1984-10-01), Palmer et al.
patent: 4558766 (1985-12-01), Palmer et al.
patent: 4595082 (1986-06-01), LeDeit
patent: 4706783 (1987-11-01), Rath et al.
patent: 4706784 (1987-11-01), Shellhouse
patent: 4729457 (1988-03-01), Cousin et al.

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