US3869022A - Telescoping step ladder - Google Patents

Telescoping step ladder Download PDF

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Publication number
US3869022A
US3869022A US479170A US47917074A US3869022A US 3869022 A US3869022 A US 3869022A US 479170 A US479170 A US 479170A US 47917074 A US47917074 A US 47917074A US 3869022 A US3869022 A US 3869022A
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United States
Prior art keywords
frame portion
ladder
members
side members
upper frame
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US479170A
Inventor
Harold J Wallk
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Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
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Publication date
Application filed by Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Priority to US479170A priority Critical patent/US3869022A/en
Application granted granted Critical
Publication of US3869022A publication Critical patent/US3869022A/en
Priority to CA226,650A priority patent/CA1018495A/en
Priority to GB21898/75A priority patent/GB1494404A/en
Priority to JP50069254A priority patent/JPS5182168A/ja
Assigned to CATERPILLAR INC., A CORP. OF DE. reassignment CATERPILLAR INC., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CATERPILLAR TRACTOR CO., A CORP. OF CALIF.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/0833—Improving access, e.g. for maintenance, steps for improving driver's access, handrails
    • 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
    • E06C5/04—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles with rigid longitudinal members capable of being elevated or extended ; Fastening means during transport, e.g. mechanical, hydraulic
    • E06C5/06—Ladders characterised by being mounted on undercarriages or vehicles Securing ladders on vehicles with rigid longitudinal members capable of being elevated or extended ; Fastening means during transport, e.g. mechanical, hydraulic by piston and cylinder, or equivalent means, operated by a pressure medium

Definitions

  • This invention relates to a ladder assembly for disposition on the side of a structure having a provision for retraction of the ladder assembly from its operative to a stored position and configuration against the side of the structure. More particularly, this invention is directed to a retractable ladder for use on vehicles such as large earth-moving vehicles.
  • the invention takes the form of a ladder assembly for disposition on the side of a supporting structure comprising an upper and a lower frame with rungs, and
  • a spring-loaded dash-pot type cylinder limits the rate of extension and retraction of the ladder assembly and automatically returns the ladder assembly to a stored position against the side supporting structure.
  • FIG. I is a side elevation view of a wheel loader vehicle showing a ladder mounted thereon in its stored position;
  • FIG. 2 is an enlarged view of the ladder of FIG. 1 illustrating details thereof;
  • FIG. 3 is a side view of the same and showing the extended, operative position of the ladder in phantom line.
  • FIG. 1 there is shown generally at 10 a wheel loader vehicle having a ladder assembly 12 mounted on the side of the rear frame 14 thereof and shown in its stored condition.
  • the ladder assembly 12 is adapted for allowing an operator to climb between the ground support surface 16 and the operator station shown generally at 18 as will be hereinafter described.
  • the ladder assembly 12 comprises an upper frame portion 20 and a lower frame portion 22 interconnected by linkage assemblies 24,26.
  • the upper frame portion comprises a pair of vertical, tubular side members 28,30, interconnected by a plurality of spaced apart horizontal rungs 32,34,36.
  • Lower frame portion 22 similarly comprises a pair of tubular side members 38,40 of a diameter so as to slidingly fit within members 28,30.
  • Side members 38,40 are similarly interconnected by a plurality of spaced apart rungs 42,44,46.
  • Upper portions 48,50 of side members 38,40 are of a length to telescope within side members 28,30.
  • each linkage assembly comprises an upper elongated link member 52, a lower elongated link member 54, and an interconnecting intermediate link member 56 connected thereto by pivots 58,60.
  • upper link member 52 has one end thereof pivotally connected to upper frame portion 20 by pivot 62 and the other end thereof to the frame or side support surface 14 by pivot 64.
  • lower link member 54 has one end thereof pivotally connected to lower frame portion 22 by pivot 66 and the other end thereof to frame 14 by pivot 68.
  • the upper link member 52 is also pivotally connected to one end of a spring biased dash-pot type cylinder 70 by pivot 72.
  • the other end of the cylinder is similarly connected to frame 14 by pivot 74.
  • the weight of an operator stepping onto one of the ladder rungs causes the ladder assembly 12 to move from its stored position parallel to frame 14 to its operative position shown at 12'.
  • lower frame portion 22 telescopes out of upper frame portion 20 to an operative position as shown at 22, 20', due to the fact that link member 54 is longer than link member 52.
  • the difference in link length also causes the complete ladder to tilt slightly as shown at 12 to facilitate climbing by the operator.
  • the dash-pot type cylinder limits the rate of extension and retraction of the ladder assembly and is spring loaded by a spring- (not shown). Since the spring is compressed as the ladder assembly is extended, it will automatically return the ladder assembly to the stored position when released by the operator.
  • the telescoping action of the ladder assembly also results in its taking up less space in the stored as opposed to its operative condition.
  • a ladder assembly for attachment to a side support surface including a ladder having an upper frame portion and a lower frame portion, means for telescoping said ladder from an operative length and position to a shorter, stored length and position, and further including means for automatically extending said ladder from its stored length and position to its operative length and position in response to an operator thereon and for causing the ladder to be retracted to its stored length and position when released by the operator.
  • said upper frame portion comprises a pair of elongated side members joined together by a plurality of rung members
  • said lower frame portion comprises a pair of elongated side members slidingly fitted with respect to said upper portion side members and joined together by a plurality of rung members.
  • said means for telescoping said ladder comprises a pair of upper, elon gated link members pivotally connected to said upper frame portion, a pair of lower elongated link members pivotally connected to said lower frame portion and an intermediate, elongated link member pivotally connecting a respective upper to a lower link member.
  • said automatic means comprises a dash-pot cylinder for limiting the rate of extension and retraction of said ladder assembly which includes spring means.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Ladders (AREA)
  • Vehicle Step Arrangements And Article Storage (AREA)

Abstract

A ladder assembly for attachment to a side support surface is provided which includes a ladder having an upper and a lower frame portion which automatically telescope in response to an operator from an operative configuration and position wherein the ladder is slightly tilted to a stored configuration and position wherein the ladder is telescoped to a shorter length than in the operative condition and is positioned parallel to the side support surface. A dash-pot type cylinder is included which limits the rate of extension and retraction of the ladder.

Description

United States Patent Wallk TELESCOPING STEP LADDER [75] Inventor: Harold J. Wallk, Mendota, Ill.
[73] Assignee: Caterpillar Tractor Co., Peoria, Ill.
[22] Filed: June 13, 1974 [21] Appl. No.: 479,170
[52] US. Cl 182/96, 182/98, 182/207,
[51] Int. Cl. E06c 5/04 [58] Field of Search 182/97, 98, 96, 95, 207, 182/208, 90; 280/166 [56] References Cited UNITED STATES PATENTS 2,611,466 9/1952 Biggert 280/166 3,012,633 12/1961 Magee 182/96 3,190,392 6/1965 Ashton 182/97 3,379,280 4/1968 Pace 182/96 Mar. 4, 1975 4/1970 Lypko 182/97 8/1971 Saucier 182/96 Primary E.raminerReinaldo P. Machado Attorney, Agent, or FirmPhillips, Moore, Weissenberger, Lempio & Strabala [57] ABSTRACT 7 Claims, 3 Drawing Figures TIELESCOPING STEP LADDER BACKGROUND OF THE INVENTION This invention relates to a ladder assembly for disposition on the side of a structure having a provision for retraction of the ladder assembly from its operative to a stored position and configuration against the side of the structure. More particularly, this invention is directed to a retractable ladder for use on vehicles such as large earth-moving vehicles.
While the following discussion concerns use on earth-moving vehicles, it is to be understood that such is merely for the sake of convenience. The invention has wider application to other uses where similar requirements are present.
As the size and complexity of large earth-moving machines increases, one problem that is encountered is that of providing easy access to various portions thereof including the drivers station and numerous service areas. In the past, use of permanently fixed ladders on vehicles necessarily within easy reach of the ground support surface has not been satisfactory. This is the case since the bottom portions thereof are usually placed below the normal ground clearance of the vehicle and therefore in a position to be damaged when the machine is in motion. In attempts to solve this problem, various types of retractable steps have been devised which can be pivoted or lifted out ofthe way. Examples are shown in U.S. Pat. No. 3,603,429 to Shepherd, and U.S. Pat. No. 3,826,337, to Liptak, the latter being assigned to the assignee hereof. Nevertheless, most of these prior art ladders are still subject to being damaged and in some cases can be shaken or jarred loose during vehicle operation. These ladders also require operator effort to return them back to the stored position, something that is not always done.
To solve this problem, self-retracting ladders such as that shown in U.S. Pat. No. 3,584,704 to Eckmann have been proposed. However, these are limited to a single step and are thus not suitable for applications where substantial height above the ground support surface is involved. Other prior art ladders such as that shown in U.S. Pat. No. 3,012,633 to Magee include a plurality of steps and a pantograph link arrangement with biasing springs to return the ladder to the stored position. This last type of ladder is not entirely satisfactory since it is essentially the same size in its stored as in its operative position.
Summary and Objects of the Invention It is therefore the primary object of this invention to provide a ladder that overcomes the above-noted disadvantages.
It is particularly an object of this invention to provide a ladder which is automatically retractable from its operative position to a stored position responsive to operator utilization.
It is also an object to provide such a ladder which is simple and inexpensive and wherein the rate of extension and retraction is limited.
It is a still further object of this invention to provide such a ladder which takes up less space in its stored than its operative position.
The invention takes the form of a ladder assembly for disposition on the side of a supporting structure comprising an upper and a lower frame with rungs, and
linkage for telescoping the upper with respect to the lower frame. A spring-loaded dash-pot type cylinder limits the rate of extension and retraction of the ladder assembly and automatically returns the ladder assembly to a stored position against the side supporting structure.
Other objects and advantages will become more readily apparent to one having skill in the art to which the invention pertains by having reference to the following description and drawings.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a side elevation view ofa wheel loader vehicle showing a ladder mounted thereon in its stored position;
FIG. 2 is an enlarged view of the ladder of FIG. 1 illustrating details thereof; and,
FIG. 3 is a side view of the same and showing the extended, operative position of the ladder in phantom line.
DETAILED DESCRIPTION Referring to FIG. 1 there is shown generally at 10 a wheel loader vehicle having a ladder assembly 12 mounted on the side of the rear frame 14 thereof and shown in its stored condition. The ladder assembly 12 is adapted for allowing an operator to climb between the ground support surface 16 and the operator station shown generally at 18 as will be hereinafter described.
As best seen in FIG. 2, the ladder assembly 12 comprises an upper frame portion 20 and a lower frame portion 22 interconnected by linkage assemblies 24,26. The upper frame portion comprises a pair of vertical, tubular side members 28,30, interconnected by a plurality of spaced apart horizontal rungs 32,34,36. Lower frame portion 22 similarly comprises a pair of tubular side members 38,40 of a diameter so as to slidingly fit within members 28,30. Side members 38,40 are similarly interconnected by a plurality of spaced apart rungs 42,44,46. Upper portions 48,50 of side members 38,40 are of a length to telescope within side members 28,30.
Taking linkage assembly 26 as exemplary, each linkage assembly comprises an upper elongated link member 52, a lower elongated link member 54, and an interconnecting intermediate link member 56 connected thereto by pivots 58,60. As best seen in FIG. 3, upper link member 52 has one end thereof pivotally connected to upper frame portion 20 by pivot 62 and the other end thereof to the frame or side support surface 14 by pivot 64. Similarly, lower link member 54 has one end thereof pivotally connected to lower frame portion 22 by pivot 66 and the other end thereof to frame 14 by pivot 68.
The upper link member 52 is also pivotally connected to one end of a spring biased dash-pot type cylinder 70 by pivot 72. The other end of the cylinder is similarly connected to frame 14 by pivot 74.
In operation, the weight of an operator stepping onto one of the ladder rungs causes the ladder assembly 12 to move from its stored position parallel to frame 14 to its operative position shown at 12'. As may be seen, lower frame portion 22 telescopes out of upper frame portion 20 to an operative position as shown at 22, 20', due to the fact that link member 54 is longer than link member 52. The difference in link length also causes the complete ladder to tilt slightly as shown at 12 to facilitate climbing by the operator. The dash-pot type cylinder limits the rate of extension and retraction of the ladder assembly and is spring loaded by a spring- (not shown). Since the spring is compressed as the ladder assembly is extended, it will automatically return the ladder assembly to the stored position when released by the operator. The telescoping action of the ladder assembly also results in its taking up less space in the stored as opposed to its operative condition.
It is to be understood that other variations are contemplated and that the invention is not to be limited except by the scope of the appended claims.
What is claimed is:
1. In a ladder assembly for attachment to a side support surface including a ladder having an upper frame portion and a lower frame portion, means for telescoping said ladder from an operative length and position to a shorter, stored length and position, and further including means for automatically extending said ladder from its stored length and position to its operative length and position in response to an operator thereon and for causing the ladder to be retracted to its stored length and position when released by the operator.
2. The invention of claim 1 wherein said upper frame portion comprises a pair of elongated side members joined together by a plurality of rung members, and said lower frame portion comprises a pair of elongated side members slidingly fitted with respect to said upper portion side members and joined together by a plurality of rung members.
3. The invention of claim 2 wherein said means for telescoping said ladder comprises a pair of upper, elon gated link members pivotally connected to said upper frame portion, a pair of lower elongated link members pivotally connected to said lower frame portion and an intermediate, elongated link member pivotally connecting a respective upper to a lower link member.
4. The invention of claim 3 wherein said lower link members are longer than said upper link members so that the lower frame portion telescopes with respect to said upper frame portion and the ladder tilts so as to facilitate climbing by the operator.
5. The invention of claim 3 wherein said automatic means comprises a dash-pot cylinder for limiting the rate of extension and retraction of said ladder assembly which includes spring means.
6. The invention of claim 2 wherein said upper frame portion side members are tubular and define a hollow therein.
7. The invention of claim 6 wherein said lower frame portion side members are tubular and of a diameter less than that of said upper frame portion side members so that said lower frame portion side members are slidingly fitted within said upper frame portion side members to telescope therein.
l l= =l

Claims (7)

1. In a ladder assembly for attachment to a side support surface including a ladder having an upper frame portion and a lower frame portion, means for telescoping said ladder from an operative length and position to a shorter, stored length and position, and further including means for automatically extending said ladder from its stored length and position to its operative length and position in response to an operator thereon and for causing the ladder to be retracted to its stored length and position when released by the operator.
2. The invention of claim 1 wherein said upper frame portion comprises a pair of elongated side members joined together by a plurality of rung members, and said lower frame portion comprises a pair of elongated side members slidingly fitted with respect to said upper portion side members and joined together by a plurality of rung members.
3. The invention of claim 2 wherein said means for telescoping said ladder comprises a pair of upper, elongated link members pivotally connected to said upper frame portion, a pair of lower elongated link members pivotally connected to said lower frame portion and an intermediate, elongated link member pivotally connecting a respective upper to a lower link member.
4. The invention of claim 3 wherein said lower link members are longer than said upper link members so that the lower frame portion telescopes with respect to said upper frame portion and the ladder tilts so as to facilitate climbing by the operator.
5. The invention of claim 3 wherein said automatic means comprises a dash-pot cylinder for limiting the rate of extension and retraction of said ladder assembly which includes spring means.
6. The invention of claim 2 wherein said upper frame portion side members are tubular and define a hollow therein.
7. The invention of claim 6 wherein said lower frame portion side members are tubular and of a diameter less than that of said upper frame portion side members so that said lower frame portion side members are slidingly fitted within said upper frame portion side members to telescope therein.
US479170A 1974-06-13 1974-06-13 Telescoping step ladder Expired - Lifetime US3869022A (en)

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Application Number Priority Date Filing Date Title
US479170A US3869022A (en) 1974-06-13 1974-06-13 Telescoping step ladder
CA226,650A CA1018495A (en) 1974-06-13 1975-05-09 Telescoping step ladder
GB21898/75A GB1494404A (en) 1974-06-13 1975-05-21 Telescoping ladder
JP50069254A JPS5182168A (en) 1974-06-13 1975-06-10

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Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3997183A (en) * 1975-09-22 1976-12-14 Caterpillar Tractor Co. Step-grab element system for a vehicle
US4067588A (en) * 1976-02-09 1978-01-10 Caterpillar Tractor Co. Ladder assembly for construction vehicles
DE3023179A1 (en) * 1979-06-28 1981-01-29 Harnischfeger Corp Retractable ladder
DE3132294A1 (en) * 1981-08-14 1983-03-03 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8000 München Extensible collapsible ladder, in particular for loading ramps of goods vehicles
US5033582A (en) * 1990-08-20 1991-07-23 Caterpillar Inc. Retractable ladder assembly
US5106256A (en) * 1989-08-07 1992-04-21 Kabushiki Kaisha Kobe Seiko Sho Step device in miniature shovel car
GB2294244A (en) * 1994-12-21 1996-04-24 Gilman F H & Co Two position Vehicle access ladder
US5538100A (en) * 1993-07-16 1996-07-23 Hedley; Robert I. Access device
AU672706B2 (en) * 1993-07-16 1996-10-10 Hedweld Engineering Pty Ltd Access ladder
US6012545A (en) * 1998-01-15 2000-01-11 Faleide; Erling Foldable vehicle ladder system
US6209682B1 (en) 2000-02-11 2001-04-03 Caterpillar Inc. Ladder assembly for track-type tractors
AU2002317532C1 (en) * 2002-12-11 2004-04-22 Mixers Australia Pty Ltd Retractable Ladder
US20060011416A1 (en) * 2004-07-15 2006-01-19 Caterpillar Inc. Access system for a moveable vehicle
US20080087496A1 (en) * 2006-10-12 2008-04-17 Thomas Graffy Retractable ladder
US20080099282A1 (en) * 2006-10-30 2008-05-01 Caterpillar Inc. Powered access device
US20090255758A1 (en) * 2008-04-15 2009-10-15 Farley Herbert M Novel rear deck service ladder and handle assembly for combines
US20100116590A1 (en) * 2008-11-07 2010-05-13 Caterpillar Inc. Powered operator access system
US20110140389A1 (en) * 2008-03-17 2011-06-16 Nathan John Ellement Access System and Device for Vehicles, and Modes of Employment Thereof
US20120181109A1 (en) * 2008-11-07 2012-07-19 Caterpillar Inc. Powered operator access system
US20120222915A1 (en) * 2011-03-03 2012-09-06 Blaska Richard C Retractable ladder
US20130048400A1 (en) * 2011-08-31 2013-02-28 Caterpillar Inc. Machine access device
US8668048B1 (en) * 2012-10-29 2014-03-11 Glen H. Morris Elevator assembly for accessing an elevated platform of a combine
US8827038B2 (en) 2012-12-12 2014-09-09 Cnh Industrial America Llc Ladder assembly for a work vehicle
US20140318892A1 (en) * 2013-04-30 2014-10-30 Caterpillar Inc. Manually powered linkage ladder
DE102014003469A1 (en) * 2014-03-07 2015-09-10 Komatsu Mining Germany Gmbh Self-rescue system for large machines
EP3006267A1 (en) * 2014-10-09 2016-04-13 Manitou Italia S.r.l. An apparatus for gaining access to lift vehicles
US9816318B2 (en) 2015-12-11 2017-11-14 David A. Johnson Powered ladder for large industrial vehicles
US9914396B1 (en) * 2016-12-19 2018-03-13 Raymond E Scott Easy-climb
US9994159B2 (en) * 2016-02-29 2018-06-12 Deere & Company Multi-position stair assembly for work vehicles
US10099623B2 (en) 2015-08-24 2018-10-16 Komatsu Ltd. Work vehicle
DE102017108377A1 (en) * 2017-04-20 2018-10-25 Alfons Kaltenecker Construction machine with a driver's cab
US10214963B2 (en) 2016-06-15 2019-02-26 Gse Technologies, Llc Access platform system with integrated folding steps
US10618472B2 (en) 2015-08-04 2020-04-14 T-Max (Hangzhou) Technology Co., Ltd. Vehicle and vehicle step apparatus with multiple drive motors
US10682960B2 (en) 2018-07-20 2020-06-16 T-Max (Hangzhou) Technology Co., Ltd. Vehicle, running board assembly and drive assembly for running board
WO2021004967A1 (en) * 2019-07-05 2021-01-14 Jaguar Land Rover A ladder assembly for a vehicle
US11198394B2 (en) 2018-07-20 2021-12-14 T-Max (Hangzhou) Technology Co., Ltd. Vehicle running board apparatus and retractable device thereof
US11376918B2 (en) 2019-03-11 2022-07-05 T-Max (Hangzhou) Technology Co., Ltd. Adjustment device, adjustor and shock absorber
US11414017B2 (en) 2019-03-05 2022-08-16 T-Max (Hangzhou) Technology Co., Ltd. Vehicle step apparatus and vehicle
US11577653B2 (en) 2020-05-11 2023-02-14 T-Max (Hangzhou) Technology Co., Ltd. Step apparatus for vehicle and vehicle
US11584387B2 (en) 2019-09-16 2023-02-21 T-Max (Hangzhou) Technology Co., Ltd. Step apparatus for vehicle and vehicle
US11590897B2 (en) 2020-05-11 2023-02-28 T-Max (Hangzhou) Technology Co., Ltd. Step apparatus for vehicle and vehicle
US11881063B2 (en) 2019-02-20 2024-01-23 T-Max (Hangzhou) Technology Co., Ltd. Management apparatus for a vehicle device, vehicle and server
US12084323B2 (en) 2019-02-28 2024-09-10 T-Max (Hangzhou) Technology Co., Ltd. Winch, rope guide and transmission device having clutch function

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US3012633A (en) * 1960-04-11 1961-12-12 John E Magee Foot ladder actuated safety means
US3190392A (en) * 1963-01-31 1965-06-22 Massey Ferguson Ltd Folding ladder for combines
US3379280A (en) * 1966-05-06 1968-04-23 Max L. Pace Folding ladder
US3508627A (en) * 1969-02-26 1970-04-28 William A Lypko Combine ladder
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US2611466A (en) * 1948-04-06 1952-09-23 Don R Biggert Combined ladder and extensible loading ramp for platforms
US3012633A (en) * 1960-04-11 1961-12-12 John E Magee Foot ladder actuated safety means
US3190392A (en) * 1963-01-31 1965-06-22 Massey Ferguson Ltd Folding ladder for combines
US3379280A (en) * 1966-05-06 1968-04-23 Max L. Pace Folding ladder
US3508627A (en) * 1969-02-26 1970-04-28 William A Lypko Combine ladder
US3601220A (en) * 1970-01-05 1971-08-24 Richard Saucier Retractable ladder

Cited By (72)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3997183A (en) * 1975-09-22 1976-12-14 Caterpillar Tractor Co. Step-grab element system for a vehicle
US4067588A (en) * 1976-02-09 1978-01-10 Caterpillar Tractor Co. Ladder assembly for construction vehicles
DE3023179A1 (en) * 1979-06-28 1981-01-29 Harnischfeger Corp Retractable ladder
DE3132294A1 (en) * 1981-08-14 1983-03-03 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8000 München Extensible collapsible ladder, in particular for loading ramps of goods vehicles
US5106256A (en) * 1989-08-07 1992-04-21 Kabushiki Kaisha Kobe Seiko Sho Step device in miniature shovel car
US5033582A (en) * 1990-08-20 1991-07-23 Caterpillar Inc. Retractable ladder assembly
WO1992003632A1 (en) * 1990-08-20 1992-03-05 Caterpillar Inc. Retractable ladder assembly
US5538100A (en) * 1993-07-16 1996-07-23 Hedley; Robert I. Access device
AU672706B2 (en) * 1993-07-16 1996-10-10 Hedweld Engineering Pty Ltd Access ladder
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
US6012545A (en) * 1998-01-15 2000-01-11 Faleide; Erling Foldable vehicle ladder system
US6209682B1 (en) 2000-02-11 2001-04-03 Caterpillar Inc. Ladder assembly for track-type tractors
AU2002317532C1 (en) * 2002-12-11 2004-04-22 Mixers Australia Pty Ltd Retractable Ladder
US20060011416A1 (en) * 2004-07-15 2006-01-19 Caterpillar Inc. Access system for a moveable vehicle
EP1619076B1 (en) * 2004-07-15 2017-04-12 Caterpillar Inc. Access system for a moveable vehicle
US7905324B2 (en) * 2004-07-15 2011-03-15 Caterpillar Inc. Access system for a moveable vehicle
US20080087496A1 (en) * 2006-10-12 2008-04-17 Thomas Graffy Retractable ladder
US7721849B2 (en) * 2006-10-12 2010-05-25 Thomas Graffy Retractable ladder
US20080099282A1 (en) * 2006-10-30 2008-05-01 Caterpillar Inc. Powered access device
US8011474B2 (en) 2006-10-30 2011-09-06 Caterpillar Inc. Powered access device
US20110140389A1 (en) * 2008-03-17 2011-06-16 Nathan John Ellement Access System and Device for Vehicles, and Modes of Employment Thereof
US8668216B2 (en) * 2008-03-17 2014-03-11 Barjoh Pty, Ltd Access system and device for vehicles, and modes of employment thereof
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JPS5182168A (en) 1976-07-19
GB1494404A (en) 1977-12-07
CA1018495A (en) 1977-10-04

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