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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0582663 (1975-06-02) |
발명자 / 주소 |
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출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 14 인용 특허 : 0 |
A door closer has an air cylinder which, when pressurized, neutralizes the door closing force applied by the closer so that the door will open with relative ease. The air cylinder is pressurized through a valve which is contained within the door and is operated by a handle on the door.
In combination with a door which moves between open and closed positions with respect to a door opening in a wall, the improvement comprising: force means for providing a restoring force when the door is opened; transfer means between the force means and the door for causing the restoring force to u
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