发明授权
- 专利标题： Automatic door closer
- 专利标题（中）： 自动门关闭
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申请号： US3699608D申请日： 1970-10-23
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公开(公告)号： US3699608A公开(公告)日： 1972-10-24
- 发明人: SCHWARZ CHARLES A
- 申请人： SOONER DOOR HARDWARE MFG CO
- 专利权人： Sooner Door Hardware Mfg Co
- 当前专利权人： Sooner Door Hardware Mfg Co
- 优先权： US8357670 1970-10-23
- 主分类号： E05F1/08
- IPC分类号： E05F1/08
摘要：
A door closing apparatus having a plurality of springs with a single spring being operable during the first stage of operation of the door, and multiple springs being operable during the second stage of operation of the door, the apparatus being provided with locking mechanism for maintaining the door in fully opened, fully closed, or any intermediate position.
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