Ergonomic extendable/retractable ladder
作者： Craig S. Aizman , Mitchell I. Kieffer , Wayne A. Shakal , Michael J. Kelly , Bruce A. Hillukka
DOI:
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摘要: An extendable/retractable ladder assembly includes a first column and second column, the nesting in rung coupled to, extending from column. A bracket collar portion, which extends about portion into rung. The may be gripped by hand of an operator order to position thumb engagement with button retract locking pin latch mounted within bracket.
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