| 摘要 |
An overload mechanism for an air inflatable gland clutch operates to open an air valve to release air from the gland when an overload condition is sensed. The air valve is opened by a piston rod actuator which is urged by a spring to engage a valve stem of the air valve. The piston operates in a cylinder on a rim on one face of the gland. The rod actuator is normally blocked from engaging the valve stem by the arm of a bell crank lever journaled on a shaft. The other arm of the bell crank lever engages a pin on a motion hinge secured to the shaft. A pin urges the motion hinge and bell crank lever into cooperative engagement to rotate together with the shaft. The shaft is rotated by a crank actuator which is mounted on a clutch shoe secured to the opposite face of the gland. When an overload condition exists, it will be reflected in the relative angular motion between the shoe and rim such that the crank actuator will rotate the shaft a predetermined amount sufficient to remove the arm of the bell crank lever from its obstruction of the rod actuator. The rod actuator is reset by admitting air under pressure to the rod end of the piston.
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