发明名称 Ladder hazard alert
摘要 There is disclosed a hazard alert system and process. The system may comprise a ladder having a hazardous step, a circuit integrated with the top step, and an alarm connected to the circuit. The circuit may be closed when a predetermined force is applied to the top step. The alarm may be powered when the circuit is closed. The process may comprise an alarm activating when a predetermined force is applied to a hazardous step of a ladder.
申请公布号 US2005173189(A1) 申请公布日期 2005.08.11
申请号 US20050056834 申请日期 2005.02.10
申请人 BERARDI PHILIP 发明人 BERARDI PHILIP
分类号 E06C7/00;(IPC1-7):E06C7/00 主分类号 E06C7/00
代理机构 代理人
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