| 摘要 |
A brake mechanism is disclosed wherein a support lever is pivoted at a pivot end to a stationary end plate and is urged by a spring, which engages the support lever at its free end, toward the end plate to effect clamping of a rotatable friction disc between a brake shoe and friction plates disposed near the pivot end of the support lever. A solenoid is mounted on the support lever and is connected to a cam pivoted to the end plate and adapted to contact the support lever near its free end to overcome the force of the spring and to release the brake when the solenoid is energized. The location of the spring and cam near the free end of the lever and the configuration of the lever provides mechanical advantages that permits the use of a smaller solenoid and spring. The arrangement of parts is such that the solenoid mechanical advantage is between approximately 24-32 to 1, depending upon the selected brake releasing clearance, while the spring mechanical advantage is approximately 81/2 to 1.
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