| 摘要 |
A clutch or brake comprises at least one annular piston reciprocally mounted therein to be selectively moved to compress an annular pressure plate against a friction disc for clutching or braking purposes. A plurality of circumferentially disposed U-shaped resilient pincher-like retraction springs each comprises parallel first and second leg portions connected together by an intermediate portion. The springs are arranged to have each first leg portion engage the piston to urge it towards its retracted position and away from the pressure plate. In one embodiment of this invention, employing a single piston, the second leg portion of the spring engages in a recess formed on a housing having the piston mounted therein. In a second embodiment, employing two back-to-back pistons each positioned adjacent to a friction disc, each leg portion of the spring engages a respective one of the pistons to urge them towards each other.
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