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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0819477 (1992-01-10) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 10 인용 특허 : 0 |
A portable step has a tread member to which is pivoted corresponding ends of a pair of support arms that terminate at their opposite ends in projections which extend from the arms at an acute angle thereto. The support arms are rockable to positions in which they substantially parallel one another a
A portable step device for use in facilitating scaling an upright barrier having a plurality of spaced apart openings therein, said device comprising a tread member having opposite sides; a pair of elongate support members; means rockably connecting said support members at corresponding ends thereof
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