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Fail-safe fire door release mechanism having automatic reset 원문보기

IPC분류정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판)
  • G05G-017/00
  • E05F-015/20
  • E06B-009/74
출원번호 US-0880094 (1992-05-07)
발명자 / 주소
  • McKeon James M. (Brooklyn NY)
출원인 / 주소
  • McKeon Rolling Steel Door Co., Inc. (Brooklyn NY 02)
인용정보 피인용 횟수 : 116  인용 특허 : 0

초록

A resettable fail-safe fire door release mechanism which allows normal powered operation of a fire door is disclosed. A solenoid having a first open state in the absence of an applied electric current and a second closed state in the presence of an applied electric current is incorporated into the m

대표청구항

An improved motor-operator unit for a fire door of the type having a high speed shaft rotatably driveable in a first direction, reversibly driveable speed reduction means for rotatably connecting said high speed shaft with a low speed shaft, means for connecting said low speed shaft to driving means

이 특허를 인용한 특허 (116)

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