Internal shoe drum brake

Details Internal shoe drum brake Internal shoe drum brake

1977-02-25

1977-12-06

Reger, Duane A.

Brakes

Wheel

Transversely movable

188196F, F16D 6556

Patent

active

040612112

ABSTRACT:
An internal shoe drum brake comprises a pair of brake shoes, return spring means, service brake means, manually actuated auxiliary brake means including an actuating lever with a finger and an adjustable, in length, strut. The strut includes relatively rotatable screw threaded parts, i.e., a screw-threaded spindle slidably received in a tube member, a ratchet wheel in threaded engagement with the spindle and stopper held in yielding contact with the wheel, so that the strut is adjustable in length to adjust shoe clearances, a pivoted adjusting lever with a pawl tooth for effecting rotation of the ratchet wheel relative to the spindle upon brake application by the auxiliary brake means, and a prestressed coil torsion spring arranged to transmit forces to urge the adjusting lever in a direction to effect shoe clearance adjustment as required in response to operation of the auxiliary brake means.

REFERENCES:
patent: 3621947 (1971-11-01), Margetts
patent: 3719258 (1973-03-01), Margetts
patent: 3794145 (1974-02-01), Margetts

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