发明名称 Door holding and releasing device
摘要 The door holding and releasing device includes a stand upon which a rotatable doorman is located and connected to a string that rotates said doorman atop said stand. The doorman, when engaged, shall hold a door in an opened state. A spring attaches between the stand and doorman in order to return the doorman to a position to hold a door open. The door holding and releasing device is preferably used with a spring-loaded door that returns to a closed position.
申请公布号 US8414040(B1) 申请公布日期 2013.04.09
申请号 US20100897847 申请日期 2010.10.05
申请人 RHODES CHARLES 发明人 RHODES CHARLES
分类号 E05C19/18 主分类号 E05C19/18
代理机构 代理人
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