| 摘要 |
A brake mechanism is retainable releasably in a braking state and includes a fixed base member to which a brake pedal unit is connected pivotally. An electromagnet is mounted on the brake pedal unit. A motor unit is located on one side of the electromagnet and has a driving shaft with a first end portion extending away from the electromagnet and a second end portion extending toward the electromagnet. A sheave is mounted securely on the first end portion of the driving shaft. A string unit has a first end portion connected to the sheave and a second end portion to be secured to a body part of the automobile. A permanent magnet is sleeved on and is movable along the second end portion of the driving shaft. The motor unit and the electromagnet are normally deactivated so as to permit the electromagnet to attract normally with the permanent magnet in order to prevent rotation of the driving shaft to prevent correspondingly winding of the string unit on the sheave. The electromagnet and the motor unit are activable so as to permit winding of the string unit on the sheave to retain the brake mechanism in the braking state. The electromagnet and the motor unit can also be activated so as to permit unwinding of the string unit to release the brake mechanism from the braking state.
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