发明名称 Combination ladder and hand truck
摘要 A combination foldable ladder and hand truck is disclosed comprising a plurality of ladder sections joined at respective ends by hinges and having retractable transport wheels and a retractable support means. The device is functional as a step ladder as well as an extension ladder in an open position with the support means and transport wheels each in their retracted positions. The device is functional as a hand truck in a closed position with the support means in an extended forward position for supporting goods and the transport wheels in an extended downward position, for rolling.
申请公布号 US4934485(A) 申请公布日期 1990.06.19
申请号 US19880153739 申请日期 1988.02.08
申请人 PEASE, ROBERT;FEESER, KENNETH 发明人 PURKAPILE, EMERSON J.
分类号 E06C1/00;E06C1/397 主分类号 E06C1/00
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