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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0422531 (1989-10-17) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 7 인용 특허 : 1 |
An attachment for use on a ladder to provide a step or tool support having a frame which can be supported on a ladder, and a movable structure which is pivotally mounted on the frame for movement between a retracted and extended position to provide the step.
A ladder attachment for use with a ladder having side members and a plurality of rungs, said ladder attachment being adapted to be attached to two said rungs intermediate the ends of said ladder, said ladder attachment comprising: frame means having opposed parallel side frame members, and opposed p
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