| 摘要 |
The present invention is a linkage assembly for a double throw safety switch. In one embodiment, the linkage assembly includes a frame connected to a first slider plate and a second slider plate. The first and second slider plates are moveably connected to the frame by guides in the form of slots which cooperate with slider supports on the frame. The profile of the slots define a range of movement of the slider plates. A driver arm is used to effect simultaneous movement of the slider plates either toward or away from a central portion of the driver arm. A first follower arm which controls a first single throw switch, and a second follower arm which controls a second single throw switch, are also connected to the frame by a spline coupling. The first follower arm includes a slider support which cooperates with a guide, again a slot, in the first slider plate. Similarly, the second follower arm includes a slider support which cooperates with a guide in the second slider plate. Movement of the driver arm effects movement of the slider plates, which in turn, control the follower arms. The guides for controlling the follower arms are configured to either maintain the position of the follower arm, or to move the follower arm to turn the switch "on" or "off." Movement of the follower arms is preferably rotational. In a modified embodiment, a single slider plate is utilized to control both the first and the second follower arms. In both cases, the linkage assembly can be used to prevent both switches from being "on" at the same time.
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