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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0641343 (1984-08-14) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 18 인용 특허 : 1 |
A platform for a ladder having rungs includes a frame and a step structure. The frame is arranged to detachably attach to at least one of the rungs of the ladder. The step structure is hingeably mounted to the frame for providing a footrest. The step structure is sized to swing upwardly and allow a
A platform for a ladder having rungs, comprising: a frame arranged to detachably attach to an intermediate one of the rungs of said ladder; a step means hingeably mounted to said frame for providing a footrest, said step means being sized to swing upwardly and allow a foothold between said step mean
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