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특허 상세정보

Safety ladder with caster assembly moveable positively to a retracted position

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) E06C-001/397    E06C-005/00   
미국특허분류(USC) 182/17 ; 182/106 ; 182/127
출원번호 US-0702885 (1976-07-06)
발명자 / 주소
인용정보 피인용 횟수 : 30  인용 특허 : 0

A safety ladder assembly having a plurality of steps and at least three support feet for supporting the ladder on a horizontal surface. A caster assembly having at least three casters for providing for rollingly transporting the ladder from one location to another. The casters are positively and conjointly moveable between a retracted storage position in which the support feet stably support the ladder on a horizontal surface and a second transporting position in which the casters stably support the ladder assembly on the horizontal surface with the supp...


A ladder assembly comprising a frame, a plurality of steps and at least three support feet for supporting said ladder assembly on a generally horizontal surface, said ladder assembly including a caster assembly upon which the ladder is adapted to be rollingly transported from one location to another, said caster assembly including at least three casters which are positively and conjointly movable between a first retracted position in which said support feet stably support said ladder assembly on said horizontal surface with said casters elevated thereabo...

이 특허를 인용한 특허 피인용횟수: 30

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  15. Ma, Oliver Joen-an. Movable base with wheels deployable by cyclic driving assembly. USP2014128919361.
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  22. Broyles ; III Luda E. (R.D. 2 ; Box 83 Elverson PA 19520). Tank safety ladder. USP1989074848517.
  23. Ma, Oliver Joen-an. Umbrella base. USP201611D771935.
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