发明名称 Extension ladder with auxiliary extension leg and supporting legs
摘要 An extension ladder includes outwardly facing auxiliary rail channels at the lower end on each of the side rails which nestingly engage inwardly facing channels on auxiliary legs extending at an angle to the plane of the ladder for supporting the ladder on irregular terrain in a stable manner. The leg assemblies are selectively positioned independently of each other and locked in a desired position by spring-loaded fingers carried on the leg assembly channels which engage teeth on the ladder rail channels. An extension leg for either of the ladder rails is provided which nestingly engages the ladder rail channel and is locked in place by a spring-loaded finger engaging the teeth on the rail channel.
申请公布号 US4723629(A) 申请公布日期 1988.02.09
申请号 US19870014549 申请日期 1987.02.13
申请人 VANDEN HOEK, VERNON M. 发明人 VANDEN HOEK, VERNON M.;MAASDAM, LEONARD J.
分类号 E06C7/42;E06C7/44;(IPC1-7):E06C5/36;E06C7/46 主分类号 E06C7/42
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