| 摘要 |
An electric switch of the snap-action type includes a pair of relatively movable contacts, an operating linkage interconnected with a movable one of the contacts for imparting operating movement thereto, a hollow tubular rotatable member interconnected with the operating linkage and operable to impart switch operating movement thereto, a latching part secured to the rotatable member and engageable with abutment means so as to secure the rotatable member against rotation, spring means in the form of a torsion bar disposed within the rotatable member and effective to impart rotation thereto upon disengagement of the latching part from the abutment means, movable motive means in the form of a rotatable tube interconnected with the torsion bar for imparting twisting moment thereto together with latch releasing means mounted on and movable with the movable motive means for engaging the latching part and for moving such part out of engagement with the associated fixed abutment means after a predetermined degree of twisting moment is imparted to the torsion bar.
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