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Supervision arrangement for smoke detectors

  • US 4,829,283 A
  • Filed: 01/05/1988
  • Issued: 05/09/1989
  • Est. Priority Date: 01/05/1988
  • Status: Expired due to Fees
First Claim
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1. In a plug-in sensor unit including a detector base and a detector head constructed and arranged for removable mounting on the detector base and to be locked to the detector base with movement of the detector head relative to the detector base to a locking position, the detector head housing a detector having contacts engaging terminals on the detector base when the detector head is assembled together with the detector base and moved to its locking position, the improvement comprisingcontact means mounted on the detector base adjacent to first and second ones of the terminals, said contact means having a mounting portion connected to the first terminal and a contact portion movable between a first position where it engages the second terminal and a second position where it is disengaged from the second terminal, said contact means interconnecting the first and second terminals when its contact portion is at its first position, and actuating means on the detector head engaging said contact means during mounting of the detector head on the detector base to move said contact portion of said contact means from its second position to its first position, means for retaining said contact portion of said contact means at its first position, and release means operated by said actuating means during removal of the detector head from the detector base allowing said contact portion of said contact means to return to its second position.

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