Friction brake assembly
AssigneesMazda Motor Corporation, Delta Kogyo Co., Ltd.
InventorsToshiaki Otani, Takeshi Chihara, Tsutomu Nishikori
Life of this patent
Estimating the term…
Abstract
A friction brake assembly for stopping the transmission of motion between drive and driven shafts comprising a brake drum, a coiled braking spring having several turns adapted to frictionally contact the inner peripheral surface of the brake drum to exert a braking force, an operating member rigidly mounted on the drive shaft within the brake drum, a hanger member rigidly mounted on the driven shaft within the brake drum, and a pair of guide members for controlling the braking spring according to the rotation of the drive shaft to allow the braking spring to be released from the condition in which it exerts the braking force.
Claims8
A friction brake assembly which comprises a brake drum accomodating therein an operating member mounted on a drive shaft for rotation together therewith, a hanger member mounted on a driven shaft for rotation together therewith, a coiled braking spring adapted to contact an inner peripheral surface of the brake drum to apply a braking force to stop the transmission of motion between the drive and driven shafts, and a pair of guide members interposed between the operating member and the hanger member and loosely pivotally connected to opposite ends of the braking spring, respectively, each of said guide members having a first abutment normally engageable with the hanger member, when and so long as the operating member is not rotated, to stop the motion of the hanger member, and a cam area engageable with the operating member during the rotation of the operating member, the normal engagement between the respective guide member and the hanger member being released by the pivotal movement of the respective guide member which takes place as a result of engagement between the cam area and the operating member at an initial stage of rotation of the operating member, a clearance necessary to release the braking spring, thereby permitting the operating member and the hanger member to rotate relative to each other, being formed between one of the operating member and the guide member and the hanger member subsequent to the disengagement between the respective guide member and the hanger member.
Dependencies are inferred from the claim text.