US3556248A - Folding ladder for a working cart - Google Patents

Folding ladder for a working cart Download PDF

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US3556248A
US3556248A US832897A US3556248DA US3556248A US 3556248 A US3556248 A US 3556248A US 832897 A US832897 A US 832897A US 3556248D A US3556248D A US 3556248DA US 3556248 A US3556248 A US 3556248A
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members
ladder
magnetic elements
pair
disposed
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US832897A
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Adolphas E Brown
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B3/00—Hand carts having more than one axis carrying transport wheels; Steering devices therefor; Equipment therefor
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06C—LADDERS
    • E06C5/00—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles
    • E06C5/02—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles with rigid longitudinal members

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  • ABSTRACT A working cart having a frame structure formed of rectangular members to which a pair of vertical members in parallel relation are supported, a set of four ladder-forming members in which two members thereof adjacent to said pair of vertical members are connected at their upper end by a pivot arm, and in which an articulated pivot arm is mounted near the lower end of the pair of vertical members for connecting with said two of said four members, and in which a plurality of magnetic elements are disposed in the pair of vertical members for the mating with magnetic elements in said two of said four members for holding the ladder in collapsed position. Steps are disposed between the set of four ladderforming members to complete the structure of the ladder, and plastic caps may be disposed over the lower ends as well as some of the upper ends of the four members.
  • the present invention relates to a an improved folding ladder for a working cart, and more particularly relates to the construction of a collapsible ladderin which magnetic elements are arranged in mating relation so that opposite poles essentially contact each other when the ladder is in its collapsed position for holding it in place, and the ladder is used in conventional fashion when the ladder is opened to its operating or working position.
  • An object of the present invention is to provide a folding ladder for selectively mounting on a working cart or any other object, and in which the folding ladder may be held in its collapsed position by means of selectively disposed and positioned magnetic elements that are in the ladder-forming members as well as in the vertical members for supporting the ladder members.
  • a further object of the present invention is to provide a ladder arrangement that is adapted for selectively mounting on a cart, a bed bunk. and the like, and in which the ladder structure is readilymoveable with the working cart or other device for use in stocking shelves or filling orders from shelves in a warehouse. and the like.
  • a working cart having a pair of wheels or casters 12.
  • the cart is formed of arectangular frame having upper member and lower member l6,'from which there is supported a pair of parallel vertical members 18, 20, the upper end being held in place by a bolt and nut arrangement 22, and the lower end being held securely in place by a similar. bolt and nut arrangement 24.
  • a hook-in means 28 may be used to secure the upper end of the parallel members 18, onto the ledge of-the frame, or its extension, as shown, and similarly a hook-in means 30 is provided near the lower end of the parallel members 18 for securing them to a lower lip of the frame 16 ofthe cart 10.
  • Y 1 i i There are provided a set of four parallel ladder forming members 32, 34, and 36. 38, which the twomembers 32, 34 are positioned adjacent to the parallel members 18, 20.
  • the upper end of the two ladder members 32, 34 is pivotally connected to the vertical support members 18, 20 by a short or triangularly disposedpivot arm 60, 62, in which pivot 64 engages one of the vertical support members, 18, 20, and pivot 66 engages one of the pair of ladder-forming members 32, 34, the pivot 66 engaging essentially the upper end thereof.
  • pivot 64 engages one of the vertical support members, 18, 20,
  • pivot 66 engages one of the pair of ladder-forming members 32, 34, the pivot 66 engaging essentially the upper end thereof.
  • an articulated pivot arm 70 mounted by a pivot means 72 connecting one of the vertical members 18, 20;
  • a pivot means 74 connects the other end of the articulated-pivot arm 70 to one of the pairs of ladder members32, 34 and it has an essentially disposed pivot 76 to provide articulation of the pivot arm 70.
  • plastic cap members 80, 82, 84, 86 At the upper and lower extremities of the ladder-forming members 32-38, there may be provided and secured thereon plastic cap members 80, 82, 84, 86.
  • magnets 90, 92 formed of pole pieces imbedded therein, as shown in the drawings, and which essentially mate with similarly disposed magnetic elements or magnet means 94, 96 respectively shown imbedded in two of the ladder-forming members 32, 34, but in which the poles are in opposing relation, so that the magnets attract each other.
  • the manner of providing magnets in opposing relations for purposes of attracting each other is conventional and well known.
  • magnets 100, 102 and 104, 106 similarly imbedded in the ladder-formingmembers 32, 34 and 36, 38 respectively.
  • a folding ladder for a working cart comprising a frame structure forming rectangular members of said working cart, a

Abstract

A working cart having a frame structure formed of rectangular members to which a pair of vertical members in parallel relation are supported, a set of four ladder-forming members in which two members thereof adjacent to said pair of vertical members are connected at their upper end by a pivot arm, and in which an articulated pivot arm is mounted near the lower end of the pair of vertical members for connecting with said two of said four members, and in which a plurality of magnetic elements are disposed in the pair of vertical members for the mating with magnetic elements in said two of said four members for holding the ladder in collapsed position. Steps are disposed between the set of four ladder-forming members to complete the structure of the ladder, and plastic caps may be disposed over the lower ends as well as some of the upper ends of the four members.

Description

United States Patent [72] Inventor Adolphas E. Brown 4127 W. Glendale Ave, Phoenix, Ariz. 85021 [21] Appl. No. 832,897 [22] Filed June 13, 1969 [45] Patented Jan. 19, 1971 [54] FOLDING LADDER FOR A WORKING CART 4 Claims, 2 Drawing Figs.
[52] U.S. Cl. 182/15, 182/96 [51] IntrCl. E06c 5/00 [50] Field ofSearch l82/l5,95, 96, 129, 107
[56] References Cited UNITED STATES PATENTS 1,068,890 7/1913 Gohlke 182/95 2,743,861 5/1956 Mattis 182/95 FOREIGN PATENTS 163,266 5/1958 Sweden 182/15 745,837 3/1956 Great Britain 182/107 Primary Examiner-Reinaldo P. Machado Attorney-Keith Misegades and George R. Douglas, Jr.
ABSTRACT: A working cart having a frame structure formed of rectangular members to which a pair of vertical members in parallel relation are supported, a set of four ladder-forming members in which two members thereof adjacent to said pair of vertical members are connected at their upper end by a pivot arm, and in which an articulated pivot arm is mounted near the lower end of the pair of vertical members for connecting with said two of said four members, and in which a plurality of magnetic elements are disposed in the pair of vertical members for the mating with magnetic elements in said two of said four members for holding the ladder in collapsed position. Steps are disposed between the set of four ladderforming members to complete the structure of the ladder, and plastic caps may be disposed over the lower ends as well as some of the upper ends of the four members.
FOLDING LADDER FOR A WORKING CART The present invention relates to a an improved folding ladder for a working cart, and more particularly relates to the construction of a collapsible ladderin which magnetic elements are arranged in mating relation so that opposite poles essentially contact each other when the ladder is in its collapsed position for holding it in place, and the ladder is used in conventional fashion when the ladder is opened to its operating or working position.
An object of the present invention is to provide a folding ladder for selectively mounting on a working cart or any other object, and in which the folding ladder may be held in its collapsed position by means of selectively disposed and positioned magnetic elements that are in the ladder-forming members as well as in the vertical members for supporting the ladder members. I
A further object of the present invention is to provide a ladder arrangement that is adapted for selectively mounting on a cart, a bed bunk. and the like, and in which the ladder structure is readilymoveable with the working cart or other device for use in stocking shelves or filling orders from shelves in a warehouse. and the like.
The above and other objects and advantages of the invention will become'apparent upon full consideration of the following detailed description and accompanying drawings in which:
FIG. 1 is a side elevation view of the folding ladder according to the preferred embodiment of the present invention, showing the ladder in the collapsed position; and 1 FIG. 2 is a side elevation view of the ladder showing it in its open and operating position Referring now to the drawings, thereis shown a working cart having a pair of wheels or casters 12. The cart is formed of arectangular frame having upper member and lower member l6,'from which there is supported a pair of parallel vertical members 18, 20, the upper end being held in place by a bolt and nut arrangement 22, and the lower end being held securely in place by a similar. bolt and nut arrangement 24. In lieu of using the bolt and nut arrangement, one may provide a construction in which a hook-in means 28 may be used to secure the upper end of the parallel members 18, onto the ledge of-the frame, or its extension, as shown, and similarly a hook-in means 30 is provided near the lower end of the parallel members 18 for securing them to a lower lip of the frame 16 ofthe cart 10. Y 1 i i There are provided a set of four parallel ladder forming members 32, 34, and 36. 38, which the twomembers 32, 34 are positioned adjacent to the parallel members 18, 20. It is seen that the set of four members 32-38 are essentially parallel to each other, and that an arrangement of steps 40, 42, 44, are pivotally disposed within the set of four ladder-forming members 32, 38, by pivots means 50,52, 54, and that the step elements operate and are disposed in conventional fashion to form the ladder. i
The upper end of the two ladder members 32, 34 is pivotally connected to the vertical support members 18, 20 by a short or triangularly disposedpivot arm 60, 62, in which pivot 64 engages one of the vertical support members, 18, 20, and pivot 66 engages one of the pair of ladder-forming members 32, 34, the pivot 66 engaging essentially the upper end thereof. Near the lower end of the vertical support members 18, 20 there is pivotally supported an articulated pivot arm 70 mounted by a pivot means 72 connecting one of the vertical members 18, 20; a pivot means 74 connects the other end of the articulated-pivot arm 70 to one of the pairs of ladder members32, 34 and it has an essentially disposed pivot 76 to provide articulation of the pivot arm 70.
At the upper and lower extremities of the ladder-forming members 32-38, there may be provided and secured thereon plastic cap members 80, 82, 84, 86.
There are shown and disposed in the vertical support members 18, 20 certain magnets 90, 92 formed of pole pieces imbedded therein, as shown in the drawings, and which essentially mate with similarly disposed magnetic elements or magnet means 94, 96 respectively shown imbedded in two of the ladder-forming members 32, 34, but in which the poles are in opposing relation, so that the magnets attract each other. The manner of providing magnets in opposing relations for purposes of attracting each other is conventional and well known. Also, there are provided essentially mating pairs of magnets 100, 102 and 104, 106 similarly imbedded in the ladder-formingmembers 32, 34 and 36, 38 respectively.
It is thus seen that the advantages of the invention are achieved and realized in the improved construction of the folding ladder having the imbedded magnets and the pivotal arrangement of the parts so that the ladder can be collapsed into its stored position by theattracting forces of magnets imbedded in the ladder, as shown and described. Also provided for securing purposes, as desired, is a resiliently mounted steel spring clip 120 for further securing the collapsible ladder in place. 7 7
Additional embodiments of the invention in this specification will occur to others and therefore it 'is intended that the scope of the invention be limited only by the appended claims and not by the embodiment described hereinabove. Accordingly, reference should be made to the following claims in determining the full scope of the invention. lclaim:
l. A folding ladder for a working cart comprising a frame structure forming rectangular members of said working cart, a
- disposed always in parallel relation to each other in which two of said four members are adjacent to said pair of vertical members and connected thereto at the upper end by a pivot arm and near the lower end by an articulated pivot arm, said two members having magnetic elements disposed thereon formating with said magnetic elements disposed on said vertical members when in closed relation, a plurality of spatially disposed step members pivotally connected near their corners for support from adjacent portions of said four ladder-forming members, said other two members having magnetic elements disposed thereon, said two members having magnetic elements disposed thereon for mating with said magnetic elements disposed on said other two members when in closed relation.
2. The invention of claim 1 wherein plastic caps are disposed over the lower ends of said four members.
3. The invention of claim 1 whereinsaid pair of vertical members are end supported by hook-in means for quick engaging said frame structure.
4. The invention of claim 1 wherein a bolt-and-nut means are used for end supporting said pair of vertical members onto said frame structure.

Claims (4)

1. A folding ladder for a working cart comprising a frame structure forming rectangular members of said working cart, a pair of vertical members in parallel relation end-supported from the frame structure and having magnetic elements disposed thereon, a set of four ladder-forming members disposed always in parallel relation to each other in which two of said four members are adjacent to said pair of vertical members and connected thereto at the upper end by a pivot arm and near the lower end by an articulated pivot arm, said two members having magnetic elements disposed thereon formating with said magnetic elements disposed on said vertical members when in closed relation, a plurality of spatially disposed step members pivotally connected near their corners for support from adjacent portions of said four ladder-forming members, said other two members having magnetic elements disposed thereon, said two members having magnetic elements disposed thereon for mating with said magnetic elements disposed on said other two members when in closed relation.
2. The invention of claim 1 wherein plastic caps are disposed over the lower ends of said four members.
3. The invention of claim 1 wherein said pair of vertical members are end supported by hook-in means for quick engaging said frame structure.
4. The invention of claim 1 wherein a bolt-and-nut means are used for end supporting said pair of vertical members onto said frame structure.
US832897A 1969-06-13 1969-06-13 Folding ladder for a working cart Expired - Lifetime US3556248A (en)

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Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3997024A (en) * 1975-11-19 1976-12-14 Fredricks Anthony T Portable scaffold ladder
US4174021A (en) * 1978-05-16 1979-11-13 Alnor Material Handling Limited Ladder truck
FR2581358A1 (en) * 1985-05-14 1986-11-07 Karashima Masashi INCORPORATED SLIDER SERVICE TROLLEY
FR2718789A1 (en) * 1994-04-18 1995-10-20 Jacobee Patrick Sliding scale maneuvering device.
GB2294244A (en) * 1994-12-21 1996-04-24 Gilman F H & Co Two position Vehicle access ladder
US20030147753A1 (en) * 2002-02-06 2003-08-07 Borge Ollgaard Wind turbine tower suspension means
US20050189733A1 (en) * 2004-03-01 2005-09-01 Lucas Jeffrey T. Multi-purpose combined ladder/cart assembly
US20060006023A1 (en) * 2004-07-08 2006-01-12 The United States Of America As Represented By Secretary Of The Army Combination rear impact guard, ladder, and ramp for military cargo vehicles
US7017711B1 (en) * 2002-10-23 2006-03-28 Shaikh Mehboob Ali Method for extending the leg of a ladder and apparatus therefor
FR2910409A1 (en) * 2006-12-26 2008-06-27 Airbus Sas Rest compartment for aircraft, has berth partially arranged above aisle separating two monuments i.e. storage modules, where one monument including storage space is laid out so that monument comprises access to berth
GB2445562A (en) * 2007-01-03 2008-07-16 Steven Mark Willis A step-on platform with adjustable legs, steps, and a hand rail
US20080227069A1 (en) * 2007-03-15 2008-09-18 Lamberty Susan L Swimming Pool Device
US20090295116A1 (en) * 2008-05-28 2009-12-03 Sharon Neeley Step assembly for utility cart
US20100059947A1 (en) * 2008-09-05 2010-03-11 Terry Shaw Combination Cart and Safety Ladder
US20100236864A1 (en) * 2005-12-02 2010-09-23 Castagno Leo L Structure having a compactable walkway
US20130037350A1 (en) * 2011-07-26 2013-02-14 Grover J. Geiselman, III Lightweight ladder
US20130118832A1 (en) * 2010-02-17 2013-05-16 Justoy Pty Ltd Access device
US8881866B1 (en) * 2013-03-25 2014-11-11 Diana Costello Self-rescue device
US9068394B1 (en) 2014-10-10 2015-06-30 Grover J. Geiselman, III Space saving ladder
US20170022759A1 (en) * 2014-03-07 2017-01-26 Komatsu Mining Germany Gmbh Self-rescue system for large machines
US20170035206A1 (en) * 2012-12-07 2017-02-09 Ralph Layne White Retractable Step Stool/Access Device
US9573609B2 (en) * 2014-12-03 2017-02-21 Romp Enterprise Co., Ltd. Picking ladder cart
US20170362901A1 (en) * 2016-06-16 2017-12-21 Nabors Drilling Technologies Usa, Inc. Drilling rig stair tower with integrated utility lines and cable tray
US9945179B1 (en) * 2013-07-11 2018-04-17 David K. Joldersma Removable step ladder for recreational vehicle
US10184293B1 (en) * 2015-03-23 2019-01-22 Amazon Technologies, Inc. Sliding ladder units

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US106889A (en) * 1870-08-30 Necticut
GB745837A (en) * 1953-05-14 1956-03-07 Cyril Harcourt Matthews Improvements in or relating to ladders
US2743861A (en) * 1952-12-29 1956-05-01 Mattis Folding stairs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US106889A (en) * 1870-08-30 Necticut
US2743861A (en) * 1952-12-29 1956-05-01 Mattis Folding stairs
GB745837A (en) * 1953-05-14 1956-03-07 Cyril Harcourt Matthews Improvements in or relating to ladders

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3997024A (en) * 1975-11-19 1976-12-14 Fredricks Anthony T Portable scaffold ladder
US4174021A (en) * 1978-05-16 1979-11-13 Alnor Material Handling Limited Ladder truck
US4652003A (en) * 1985-05-14 1987-03-24 Masashi Karashima Carrying cart equipped with service rack and stepladder
FR2581358A1 (en) * 1985-05-14 1986-11-07 Karashima Masashi INCORPORATED SLIDER SERVICE TROLLEY
FR2718789A1 (en) * 1994-04-18 1995-10-20 Jacobee Patrick Sliding scale maneuvering device.
EP0679794A1 (en) * 1994-04-18 1995-11-02 Patrick Jacobee Extension ladder operating device
GB2294244A (en) * 1994-12-21 1996-04-24 Gilman F H & Co Two position Vehicle access ladder
GB2294244B (en) * 1994-12-21 1996-09-18 Gilman F H & Co Vehicle ladders
US20080145232A1 (en) * 2002-02-06 2008-06-19 Vestas Wind Systems A/S Wind turbine tower suspension means
US20030147753A1 (en) * 2002-02-06 2003-08-07 Borge Ollgaard Wind turbine tower suspension means
US8938931B2 (en) 2002-02-06 2015-01-27 Vestas Wind Systems A/S Wind turbine tower suspension means
US20100186342A1 (en) * 2002-02-06 2010-07-29 Vestas Wind Systems A/S Wind turbine tower suspension means
US7017711B1 (en) * 2002-10-23 2006-03-28 Shaikh Mehboob Ali Method for extending the leg of a ladder and apparatus therefor
US20050189733A1 (en) * 2004-03-01 2005-09-01 Lucas Jeffrey T. Multi-purpose combined ladder/cart assembly
US7093840B2 (en) 2004-03-01 2006-08-22 Isotec, Inc. Multi-purpose combined ladder/cart assembly
US20060006023A1 (en) * 2004-07-08 2006-01-12 The United States Of America As Represented By Secretary Of The Army Combination rear impact guard, ladder, and ramp for military cargo vehicles
US8376084B2 (en) * 2005-12-02 2013-02-19 Leo L. Castagno Structure having a compactable walkway
US20100236864A1 (en) * 2005-12-02 2010-09-23 Castagno Leo L Structure having a compactable walkway
US8925686B2 (en) 2006-12-26 2015-01-06 Airbus Collapsible staircase, notably for a vehicle such as an aircraft
FR2910409A1 (en) * 2006-12-26 2008-06-27 Airbus Sas Rest compartment for aircraft, has berth partially arranged above aisle separating two monuments i.e. storage modules, where one monument including storage space is laid out so that monument comprises access to berth
US20080156933A1 (en) * 2006-12-26 2008-07-03 Airbus Collapsible staircase, notably for a vehicle such as an aircraft
GB2445562A (en) * 2007-01-03 2008-07-16 Steven Mark Willis A step-on platform with adjustable legs, steps, and a hand rail
US20080227069A1 (en) * 2007-03-15 2008-09-18 Lamberty Susan L Swimming Pool Device
US20090295116A1 (en) * 2008-05-28 2009-12-03 Sharon Neeley Step assembly for utility cart
US20100059947A1 (en) * 2008-09-05 2010-03-11 Terry Shaw Combination Cart and Safety Ladder
US9194180B2 (en) * 2010-02-17 2015-11-24 Justoy Pty Ltd Access device
US20130118832A1 (en) * 2010-02-17 2013-05-16 Justoy Pty Ltd Access device
US20130037350A1 (en) * 2011-07-26 2013-02-14 Grover J. Geiselman, III Lightweight ladder
US10582774B2 (en) * 2012-12-07 2020-03-10 Ralph Layne White Retractable step stool/access device
US20170035206A1 (en) * 2012-12-07 2017-02-09 Ralph Layne White Retractable Step Stool/Access Device
US8881866B1 (en) * 2013-03-25 2014-11-11 Diana Costello Self-rescue device
US9945179B1 (en) * 2013-07-11 2018-04-17 David K. Joldersma Removable step ladder for recreational vehicle
US20170022759A1 (en) * 2014-03-07 2017-01-26 Komatsu Mining Germany Gmbh Self-rescue system for large machines
US10731414B2 (en) * 2014-03-07 2020-08-04 Komatsu Mining Germany Gmbh Self-rescue system for large machines
US9068394B1 (en) 2014-10-10 2015-06-30 Grover J. Geiselman, III Space saving ladder
US9573609B2 (en) * 2014-12-03 2017-02-21 Romp Enterprise Co., Ltd. Picking ladder cart
US10184293B1 (en) * 2015-03-23 2019-01-22 Amazon Technologies, Inc. Sliding ladder units
US10662718B2 (en) * 2016-06-16 2020-05-26 Nabors Drilling Technologies Usa, Inc. Drilling rig stair tower with integrated utility lines and cable tray
US20170362901A1 (en) * 2016-06-16 2017-12-21 Nabors Drilling Technologies Usa, Inc. Drilling rig stair tower with integrated utility lines and cable tray

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