Girling Limited

Lucas Industries Limited

Geoffrey Harvey

Hugh G Margetts

Charles Newstead

Alexander J Wilson

Andrew Charles Assinder

A vehicle drum brake has a shoe mounted on a back plate, one end of the shoe engaging an actuator and the other end engaging an abutment. To avoid the use of a fluid pressure control valve to vary the braking effort of the brake in dependence upon vehicle loading, the abutment is in the form of a roller which engages an arcuate member on the shoe, the roller being movable laterally of the shoe to vary the braking effort for a given actuating force. The roller may be connected to a pivoted lever which is rotatably mounted in the back plate and which is connected to a sprung part of the vehicle by a linkage. Movement of the sprung part due to changes in vehicle loading rotates the lever and moves the roller.

Load responsive drum brake assembly

In a disc brake including pad assemblies for engagement with opposite faces of a rotatable disc and a clamp assembly extending over the peripheral edge of the disc, the clamp assembly comprises pressure plates interconnected by spaced parallel limbs passing through superimposed openings in the plates and interconnected at one pair of adjacent ends by a bridge piece which acts on one of the pressure plates.

Disc brakes for vehicles

An automatic slack adjuster assembly is provided in or for a vehicle internal shoe drum brake of the duo-servo type having primary and secondary shoes located within a rotatable drum so that the primary shoe is carried round with the drum when the brake is applied, the slack adjuster assembly being located in a housing between adjacent ends of the shoes and including a thrust member which engages the ends of the shoes and transmits thrust on the primary shoe to the secondary shoe when the brake is applied. The adjuster assembly includes a sensing mechanism which senses relative movement between the thrust member and the housing and controls an energy-storing clutch mechanism which is connected to an adjuster and operates the adjuster to increase the effective length of the thrust member when the torque generated by the stored energy force is greater than the torque generated by the force applied to the thrust member from the shoe ends.

Growing community of inventors

Birmingham, United Kingdom

Geoffrey Harvey