Drum brake and adjustment therefor

Details Drum brake and adjustment therefor Drum brake and adjustment therefor

F - Mech Eng,Light,Heat,Weapons

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D

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F16D 51/30 (2006.01) F16D 65/54 (2006.01) F16D 65/24 (2006.01)

Patent

CA 1071549

DRUM BRAKE AND ADJUSTMENT THEREFOR ABSTRACT OF THE DISCLOSURE A drum brake includes a pair of brake shoes which are pivotally mounted on a backing plate by means of pins which extend from the latter. A pair of hydraulic actuators are also mounted by the pins and these hydraulic actuators are engageable with respective brake shoes In order to move the brake shoes radially during a braking application. A piston is slidab1y mounted within a bore on each of the hydraulic actuators and is provided with a head engaging a corresponding brake shoe. A spring clip secured to the piston head releasably engages the brake shoe so that the piston and brake shoe move together in unison. A frusto conical recess within the bore receives a seal and the seal is deformable during a braking application as the piston moves within the bore. When braking is terminated, the seal returns to its rest position thereby retrac- ting the piston and brake shoe.

296815

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