Duo-servo drum brake

Brakes – Wheel – Transversely movable

Patent

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Details

188216, 188331, 188340, 188341, F16D 6509

Patent

active

054008824

ABSTRACT:
In a duo-servo drum brake comprising a mechanical expander adjacent a thrust bearing for supporting the brake shoes, with the expander including an operating lever to which is transmitted the operating force of an actuator substantially in a direction tangential to the edge of the brake drum. The brake shoe is movable through an expander in the direction of the operating force and connected to a thrust bearing through a prestressed spring. The spring force of the prestressed spring opposes the expanding force of the expander and exceeds the operating force required for placing the brake shoes in abutment with the brake drum on the operating lever.

REFERENCES:
patent: 1660176 (1928-02-01), Rayburn
patent: 1940022 (1933-12-01), Schnell
patent: 2161640 (1939-06-01), Schnell
patent: 2192001 (1940-02-01), Bolster
patent: 2788866 (1957-04-01), Porsche et al.
patent: 3175644 (1965-03-01), Klein
patent: 3874481 (1975-04-01), Margetts
patent: 4869352 (1989-09-01), Sampson
patent: 4887698 (1989-12-01), Hunt et al.
patent: 5044475 (1991-09-01), Clark
patent: 5058713 (1991-10-01), Evans
patent: 5180037 (1993-01-01), Evans

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