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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
초록

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...

대표
청구항

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

  1. Hansberry ; Jr. Charles J. (P.O. Box 764 Exton PA 19341). Combined article mover and worker support. USP1983024373761.
  2. Moffat William,AUX. Ladder. USP2001016179087.
  3. Abraham, Richard J.. Ladder transport system. USP2003076592134.
  4. Abraham,Richard J.. Ladder transport system. USP2008047350621.
  5. Moss,N. Ryan; Bowers,Jack W.. Ladder wheel pair. USP200801D560001.
  6. Chiu, Cheng-Hung. Lifting machine base assembly for a machine tool. USP2014028657306.
  7. Honeycutt, Robert W.. Mobile access unit and cage. USP2018029902577.
  8. Gass, Stephen F.; Wright, James F. W.. Mobile base for a table saw. USP2012088246059.
  9. Gass, Stephen F.; Wright, James F. W.. Mobile base for a table saw. USP2013088511693.
  10. Gillis Donald G. ; Johnson Daniel. Mobile ladder stand. USP1999085941341.
  11. Gillis, Donald G.; Johnson, Daniel. Mobile ladder stand. USP2005116962233.
  12. Morgan Frank O.. Mobile scaffolding apparatus with retractable wheels. USP1999085937967.
  13. Swiderski Paul R.. Mobile warehouse ladder. USP1998085791434.
  14. Ma, Oliver Joen-an. Movable base with control surface. USP2015028960625.
  15. Ma, Oliver Joen-an. Movable base with wheels deployable by cyclic driving assembly. USP2014128919361.
  16. Ma, Oliver Joen-an. Movable base with wheels deployable by reversible driving assembly. USP2014128919722.
  17. Zettel,Daniel M.. Non-powered transportable cart. USP2008017322586.
  18. Gilbreath William E. (Huffman TX). Rolling scaffolding base. USP1986114620608.
  19. Ma, Oliver Joen-an. Rotation base for umbrella. USP2018059957728.
  20. Bieszczad Todd Anthony. Safety mobile ladder stand. USP2001106305496.
  21. Ma, Oliver Joen-an. Shape retaining foldable umbrella base. USP2017019540840.
  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.
  24. Ma, Oliver Joen-an. Umbrella base. USP201610D768978.
  25. Ma, Oliver Joen-an. Umbrella base. USP201701D775461.
  26. Ma, Zhun-An. Umbrella base. USP201811D833136.
  27. Young, David T.; Kaczor, Scott E.. Undercarriage for mobile ladders and platforms. USP2003026523640.
  28. Trask,John Peter. Vehicle stand system. USP2007037194779.
  29. Sayles, John. Weight-releasing ladder lockstep. USP2010117828115.
  30. Mikros, Harry. Wheel extension and lift device for ladders. USP2004026688426.