Internal shoe drum brake
AssigneeLucas Industries Limited
InventorJoseph H. McNinch, Jr.
Life of this patent
Estimating the term…
Abstract
An internal shoe drum brake has a pair of brake shoes mounted on a backplate with one pair of adjacent shoe ends in sliding engagement with an abutment fixed to or integral with the backplate. An actuator disposed between the other pair of adjacent shoe ends is operable to move the shoes, in use, into braking engagement with the braking surface of the rotary brake drum. At least the actuator or abutment is provided with shoe tip engagement surfaces of arcuate form and the respective engaging shoe tips have a generally complementary arcuate form resulting in a generally even wear pattern for the shoes.
Claims9
An internal shoe drum brake comprising a pair of brake shoes mounted on a backplate with one pair of adjacent shoe ends in sliding engagement with an abutment fixed to or integral with the backplate, and an actuator disposed between the other pair of adjacent shoe ends and operable to move the shoes, in use, into braking engagement with the braking surface of a rotary brake drum, at least one of the fixed abutment and actuator being provided with shoe tip engagement surfaces of arcuate form and the respective engaging shoe tips having a generally complementary arcuate form, and wherein the radius of each engaging shoe tip is different from that of the associated engagement surface.
Dependencies are inferred from the claim text.