Brakes – Wheel – Transversely movable
Patent
1979-04-04
1980-12-02
Halvosa, George E. A.
Brakes
Wheel
Transversely movable
188106A, 188196D, 192111A, F16D 6556
Patent
active
042366119
ABSTRACT:
A drum brake includes a pair of brake shoes which are carried by and pivotally anchored to a backing plate. The pair of shoes are engageable with a brake drum to effect a brake application. A running clearance is maintained between the brake shoes and the drum when the brakes are released by an adjusting member which includes an adjusting lever pivotally carried by one of the shoes and a fixed-length spacer carried between the adjusting lever and the other brake shoe. An extensible member is carried between one end of the adjusting lever and the one brake shoe and a three-bar linkage effects an extension of the member to compensate for wear of the brake shoes. The adjusting lever forms one bar of the linkage and carries the other two bars. The second bar of the linkage is pivotally engaged with the adjusting lever and with the spacer and is biased so as to move the spacer away from the adjusting lever during a brake application. The third bar is pivoted to the second and guided by the one end of the lever for movement perpendicular to the extensible member. Pivoting of the first bar relative to the lever translates the third bar relative to the extensible member. A one-way driving connection between the third bar and the extensible member provides a degree of lost motion which corresponds to a predetermined brake shoe wear.
REFERENCES:
patent: 2287238 (1942-06-01), Goepfrich
patent: 3357527 (1967-12-01), Bauman et al.
patent: 3709334 (1973-01-01), Kondo
patent: 3717227 (1973-02-01), Rath
patent: 4039055 (1977-08-01), Meyer et al.
Decker Ken C.
Halvosa George E. A.
Schoenle Paul David
Societe Anonyme DBA
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