| 摘要 |
A step switch having contacts actuatable in predetermined indexed positions comprises a rotatable driving shaft and a coaxial driven shaft rotating an indexing mechanism into the indexed positions for actuating the contacts. A coupling is arranged between the shafts for indexing the rotary movement of the driven shaft in response to the rotation of the driving shaft. The coupling includes a driving coupling part keyed to the driving shaft, a driven coupling part keyed to the driven shaft, the coupling parts having peripheries coaxial with the shafts, a spring having two ends respectively engaging the coupling parts and being tensioned in the direction of the coupling part peripheries, and a shape-conforming blocking device controlled by the rotary position of the shafts in relation to each other for respectively blocking and unblocking the rotary movement of the driven coupling part. |
