发明名称 Back packable portable unit
摘要 A portable, backpackable crane lift involving a retractable boom, boom cable, winch and winch cable mounted to a wheeled frame with extendable axles all which fold into a compact unit. A shoulder harness apparatus which attaches to the folded unit for carrying converts to a ballast carrying extension of the frame during operation. Such a lift is readily carried up a ladder for use on flat roofs to raise and place air conditioning heat exchangers and the like.
申请公布号 US4782962(A) 申请公布日期 1988.11.08
申请号 US19820348816 申请日期 1982.02.16
申请人 HACKWORTH, HARRY L.;MITCHELL, GERALD D. 发明人 HACKWORTH, HARRY L.;MITCHELL, GERALD D.
分类号 B66C23/20;(IPC1-7):B66C23/72;B66C23/06;A45F4/02 主分类号 B66C23/20
代理机构 代理人
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