| 摘要 |
A collision preventive device for medical equipment (such as readiotherapy equipment) having moving parts to which accessaries are disengageably attached includes a contact detection circuit in which the normally closed contact detector switches disposed on the moving part and on the accessary are all coupled in series, so that an occurrence of contact of the moving part or of the accessary attached thereto can be detected by a relay coupled across a current source in series with the contact detector switches. The detector switch on the moving part and that on the accessary are coupled via a connector of a special structure: the connector half disposed on the moving part to which the accessary is attached includes a pair of terminals and a short circuit plate which is automatically electrically coupled across and disconnected from the two terminals according as the accessary is attached to or detached from the moving part, so as to couple or remove the mating connector half disposed on the accessary to or from the connector half on the moving part. Thus, irrespective of whether the accessary is attached or not, the contact detector switches that are currently utilized in detection are automatically coupled in series with the relay coupled across the current source. Further, the detection of the attachment of an accessary can be effected by a simple circuit coupled to the short circuit plate.
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