发明名称 Collapsible safety attachment for ladder
摘要 An improved safety attachment for a ladder in which the attachment is collapsible to render it more compact for storing and handling purposes yet the attachment can be readily expanded for use on a ladder. The attachment includes a pair of spaced sides which are coupled together by a pair of vertically spaced cross-pieces with the cross-pieces being either removable from connection with the sides or articulated with respect to the sides so that the sides can be moved toward and away from each other to form a compact unit to facilitate storage and handling of the attachment.
申请公布号 US4860855(A) 申请公布日期 1989.08.29
申请号 US19880169792 申请日期 1988.03.17
申请人 RILEY, JON D. 发明人 RILEY, JON D.
分类号 E04D15/00;E04G3/26;E06C7/18 主分类号 E04D15/00
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