Drum brake with automatic adjustment

Brakes – Wheel – Transversely movable

Patent

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Details

188196B, 188 7956, 192111A, F16D 5100, F16D 5124, F16D 6562

Patent

active

048098264

ABSTRACT:
The automatic adjustment of a drum brake is obtained by way of an adjusting lever (30) fitted to pivot on one (12) of the brake shoes when the wear of the friction linings (16) on the brake shoes (12) warrants it. This lever rests against a spacer (44) connecting the ends of the brake shoes between which the brake motor is located, such that the position of the lever (30) determines the distance apart in the rest position between these two ends when this motor is not actuated. Two surfaces opposite one another (48, 50) formed respectively on the spacer (44) and on the lever (30) define an operating clearance between them beyond which an adjustment is made when the brake is actuated. A lug (56) on a bimetal strip (52) takes up the space between the surface (48, 50) in order that an inadvertent adjustment does not occur due to an overheating of the brake drum when the temperature exceeds a certain threshold, thus increasing the operating clearance.

REFERENCES:
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patent: 3339678 (1967-09-01), Burnett
patent: 3983970 (1976-10-01), Courbot
patent: 4039055 (1977-08-01), Meyer et al.
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patent: 4385681 (1983-05-01), Conrad et al.
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patent: 4533024 (1985-08-01), Rath
patent: 4646881 (1987-03-01), Denree et al.
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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