| 摘要 |
The coupling system is assembled upon the placing of the auxiliary contact block including its dogs integrally formed at its bearing surface and its coupling member including a coulisse onto the switch apparatus followed by a shifting of the auxiliary contact block. When placing the auxiliary contact block onto the switch apparatus the dogs engage between tooth-shaped projections in the trough built on the switch apparatus. During the shifting carried out thereafter, the dogs are shifted under the projections and moved into engagement. A catch is located in the trough, which catch is integrally formed on the movable contact carrier of the switch apparatus and which catch upon shifting of the auxiliary contact block is moved in the coulisse of the coupling member formed on the auxiliary contact carrier. This form locked and releasable coupling is safeguarded against a shifting by means of locking members.
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