US3891056A - Hydraulically elevatable platforms - Google Patents

Hydraulically elevatable platforms Download PDF

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Publication number
US3891056A
US3891056A US440552A US44055274A US3891056A US 3891056 A US3891056 A US 3891056A US 440552 A US440552 A US 440552A US 44055274 A US44055274 A US 44055274A US 3891056 A US3891056 A US 3891056A
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United States
Prior art keywords
boom
booms
access equipment
stops
equipment according
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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
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US440552A
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English (en)
Inventor
Denis Henry Ashworth
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Simon Engineering Dudley Ltd
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Simon Engineering Dudley Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
    • B66F11/044—Working platforms suspended from booms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • B66F17/006—Safety devices, e.g. for limiting or indicating lifting force for working platforms

Definitions

  • ABSTRACT Access equipment of the kind comprising an articulated boom structure which consists of a first boom pivotally and preferably rotatably mounted on a vehicle or like supporting structure, and at least one further boom pivotally connected to the free end of the first boom, hydraulic actuating cylinders being provided for effecting relative pivotal movement of the booms one to the other, and both to the supporting structure, means being associated with each boom and movable therewith for transmitting movements of the booms individually and collectively to a plurality of stops which are thus movable to actuate control valves for the hydraulic actuating cylinders, the stops being arranged in response to movements of the booms and in accordance with permitted degrees of pivotal movement thereof to arrest operation of the actuating cylinders as appropriate to prevent the boom structure assuming a potentially unstable configuration.
  • SHEET 1 HYDRAULICALLY ELEVATABLE PLATFORMS This invention concerns access equipment of the kind (hereinafter termed of the kind referred to) comprising an articulated boom structure consisting of a first boom pivotally and preferably rotatably mounted on a vehicle or like supporting structure, and at least a second boom pivotally connected to the free end of said first boom, hydraulic actuating cylinders being provided for effecting pivoting movement of the second boom relative to the first and both booms relative to the supporting structure.
  • An object of the invention is to provide access equipment of the kind referred to, wherein movement of the booms into a potentially unstable condition is prevented, and preferably wherein permitted movements are progressively retarded to prevent sudden arrest thereof at the permitted limits.
  • access equipment of the kind referred to, wherein means are associated with each of said booms and movable therewith for transmitting movements thereof individually and collectively to stops which are movable to actuate control valves for said hydraulic actuating cylinders, said stops thus being arranged in response to movements of said booms and in accordance with permitted degrees of pivotal movement thereof to arrest operation of said actuating cylinders as appropriate to prevent the boom structure assuming a potentially unstable configuration.
  • FIGS. 1 and 2 show schematically a boom structure in two operational positions
  • FIG. 3 is an elevation of a link system connected to said boom structure and having stop means in accordance with the invention
  • FIG. 4 is a plan view of the arrangement shown in FIG. 3.
  • an articulated boom structure comprises in this case two main booms l and 11 hereinafter referred to as first and second booms respectively, and a shorter auxiliary boom 12 having a cage or working platform 13 pivotally mounted at the outermost end thereof.
  • the lowermost or innermost end of the first boom is pivotally mounted on a turntable 9 for rotation relative to a supporting structure such as a vehicle (not shown).
  • a parallelogram linkage system is provided for maintaining the cage 13 level for all positions of the boom structure.
  • This system comprises three levelling rods 14, 17 and 19 forming parallelograms respectively with said first, second and auxiliary booms.
  • Actuating means comprising hydraulic cylinders 20 and 20a are provided for elevating the first boom relative to the turntable 9 and the second boom relative to the first.
  • the cylinder 20a operates a rod 21 connected to the second boom, a rod 22 being pivotally connected at one end to the rod 21 part way along its length, and at the other end to said first boom 10.
  • the cylinder 20, rod 21 and rod 22 are positioned along the longitudinal centre line of the boom structure.
  • a pivot shaft 23 to which the rod 22 is attached extends outwardly through the wall of the boom 10 and has attached to one end a first connecting link 24.
  • a second connecting link 25 is pivotally attached to the link 24 and extends back along the side of the boom 10 towards the turntable 9.
  • the end of the link 25 remote from the link 24 is pivotally connected to one end of a common link 26, the other end of which is pivotally connected to the lower levelling rod 14 associated with the boom 10.
  • a driving link 27 pivotally connected at one end to the upper end of the common link 26 is connected at its other end to a driving arm 28.
  • the arm 28 is pivotally mounted at its lower end on a shaft 30 attached to the boom 10, and carries striking abutments 29 and 29a adjacent the shaft 30.
  • a further driving link 31 which, at its other end, is connected to a further driving arm 32 part way along its length.
  • the arm 32 is also pivotally mounted on shaft 30, and there is a corresponding driving arm 32a spaced therefrom and pivotally mounted on a shaft 33 also attached to boom 10.
  • a rod 34 Interconnecting the upper ends of the driving arms 32, 32a is a rod 34 which carries four stops or strikers A, B, C and D.
  • a further pair of driving arms 35 and 36 pivotally mounted on shaft 30 and ashaft 37 respectively are interconnected at their upper ends by a rod 38 which carries two further stops or strikers E and F spaced apart along its length.
  • a still further pair of driving arms 39 and 40 are pivotally mounted on shafts 37 and 33 respectively, and are interconnected at their upper ends by a rod 41 which carries two further stops or strikers G and H spaced apart along its length.
  • Driving arms 36 and 39 are normally retained in the positions shown in FIGS. 3 and 4 by springs 42.
  • the driving arms 28, 32, 32a, 35, 36, 39 and 40 are all separately and freely rotatable on their associated shafts 30, 33 and 37.
  • Two further abutments X and Y are mounted in spaced apart relationship directly on levelling rod 14 and extend into the line of pivoting movement of the arm 39.
  • the strikers A to H are operatively disposed adjacent control levers and 51 pivotally mounted respectively on shafts 52 and 53, and adapted to actuate the hydraulic cylinders for raising and lowering the first and second booms respectively. Movement of the lever 50 to the left and right in FIG. 4 causes the first boom to be lowered and raised respectively. Movement of the lever 51 to the left and right in FIG. 4 causes the second boom to be raised and lowered respectively.
  • the system so far described is adapted to ensure that the boom structure can never be moved into a potentially unstable condition, such as would be created when a vertical line from the combined centres of gravity of the parts of the boom structure falls outside an area bounded by the supporting structure, which latter normally comprises a vehicle having stabilising jacks.
  • FIGS. 3 and 4 The positions of the parts as shown in FIGS. 3 and 4 is for a condition when both booms l and 11 are in a stowed position, i.e., both horizontal and in superimposed relationship.
  • the lower levelling rod 14 is moved to the left.
  • the link 26 thus pivots in a clockwise direction about its upper end, causing the stop C to move away from control lever 51, allowing further elevation of the second boom 11 if required.
  • the stop B on rod 34 contacts the control lever 50 returning it once again gradually to a central position. Further elevation of the second boom, however, moves stop B away from control lever 50, thus allowing further elevation of the first boom if required.
  • Stops A, B, C, and D serve as described to control the degree of movement of booms 10 and 1 l to within safe limits and to retard such movement as the booms approach said limits.
  • the remainder of the system serves, on the other hand, to retard movement of the booms as they approach limits determined by the stroke of the hydraulic actuating cylinders.
  • stop X contacts and moves arm 39 so that the action of stop G slows down and finally arrests movement of the first boom by contacting control lever 50 and moving same gradually to its central position.
  • the assembly illustrated in FIGS. 3 and 4 is housed within a casing 45 on the first boom 10, which also houses the control levers 50 and 51 which are manually operable, duplicate controls being provided in the cage 13. Operation of the duplicate controls causes actual movement of the main control levers 50 and 51, which therefore ensures that the safety system operates when the boom structure is moved by an operator, whether in the cage or at the base. In some cases, an over-ride feature is provided which enables cancellation of the ability to control movement of the booms from the cage. However, the safety system is linked to the base controls and therefore remains operative at all times.
  • movements of the second boom may be transmitted from the boom itself or any part or parts which move with the boom.
  • the rod 22 it is preferable to utilise the rod 22 for this purpose as it moves through a smaller angle than the second boom, although its movement remains proportional to that of the latter.
  • This smaller angle of movement is approximately equal to that moved by the first boom, so that both ends of the common link move through a similar angle, thus avoiding a complex construction of the link in order to combine the movements transmitted from both booms.
  • Access equipment comprising an articulated boom structure comprising a first boom pivotally mounted at one end on a vehicle or like supporting structure and at least a second boom pivotally connected to the free end of said first boom, hydraulic actuating cylinders connected for effecting pivoting movement of the second boom relative to the first boom and both booms relative to said supporting structure, control valves for said cylinders, movably mounted stops for controlling actuation of said valves, and means associated with each of said booms and movable therewith for transmitting movements thereof individually and collectively to said stops to actuate said control valves, said stops being so arranged that in response to movements of said booms and in accordance with permitted degrees of pivotal movement thereof operation of said actuating cylinders is controlled as appropriate to prevent the boom structure assuming a potentially unstable configuration.
  • said means comprise a pair of members each reciprocable substantially linearly in response to clockwise and anti-clockwise pivoting movements respectively of its associated boom, said stops being carried by a further member also movable substantially linearly and operatively connected to said pair of members, the position of said further member being at all times representative of the combined linear positions of said pair of members.
  • Access equipment wherein said further stops are carried by two further linearly reciprocable members, each normally maintained in a non-operative position and movable only when its associated boom approaches a fully lowered or elevated position.
  • control valves are manually operable and connected for simultaneous operation to duplicate control valves provided on a cage or working platform at the uppermost end of the boom structure.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Jib Cranes (AREA)
US440552A 1973-02-21 1974-02-07 Hydraulically elevatable platforms Expired - Lifetime US3891056A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB852673A GB1458506A (fi) 1973-02-21 1973-02-21

Publications (1)

Publication Number Publication Date
US3891056A true US3891056A (en) 1975-06-24

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ID=9854129

Family Applications (1)

Application Number Title Priority Date Filing Date
US440552A Expired - Lifetime US3891056A (en) 1973-02-21 1974-02-07 Hydraulically elevatable platforms

Country Status (8)

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US (1) US3891056A (fi)
AT (1) AT351706B (fi)
BE (1) BE811162A (fi)
CA (1) CA992470A (fi)
DE (1) DE2408405A1 (fi)
FI (1) FI53564C (fi)
GB (1) GB1458506A (fi)
SE (1) SE390721B (fi)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0217294A2 (en) * 1985-09-30 1987-04-08 FASSI GRU IDRAULICHE S.p.A. Highly maneuverable insulated man lifting aerial crane for use in servicing overhead high-voltage electrical transmission lines
US4687073A (en) * 1983-07-30 1987-08-18 Simon Engineering Dudley Limited Hydraulically elevatable access equipment
US4754840A (en) * 1987-10-07 1988-07-05 Jlg Industries, Inc. Leveling assembly for work platforms on articulating booms
US5082085A (en) * 1990-08-30 1992-01-21 Up-Right, Inc. Platform leveling apparatus
US5249643A (en) * 1992-04-03 1993-10-05 Kidde Industries, Inc. Vehicular self-propelled aerial work platform and telescoping parallelogram boom therefor
US5379664A (en) * 1992-10-07 1995-01-10 United Kingdom Atomic Energy Authority Hydraulic manipulator
US5704498A (en) * 1996-09-25 1998-01-06 Kidde Industries, Inc. Transportable crane
US6390312B1 (en) 1998-02-27 2002-05-21 Jlg Industries, Inc. Lift structures and lifting arrangement therefor
US6488161B1 (en) 2000-05-02 2002-12-03 Jlg Industries, Inc. Boom mechanism
US20110182706A1 (en) * 2010-01-22 2011-07-28 Marola Martin A Heavy Duty Vehicle Recovery System
US20160108672A1 (en) * 2005-06-16 2016-04-21 Barjoh Pty Ltd Vehicle access system

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT8005120A0 (it) * 1980-02-20 1980-02-20 Cella Spa Dispositivo di limitazione di un'apparecchiatura di sollevamento con braccio ad allungamento telescopico ovvero articolato e telescopico.
SE423620B (sv) * 1980-09-08 1982-05-17 Kranlyft Ab Sekerhetsanordning for hydrauliskt manovrerade manskapsliftar
EP0073598B1 (en) * 1981-08-20 1985-12-27 University Of Bradford Hinge mechanisms
IT1154479B (it) * 1982-02-25 1987-01-21 Jacques Tranchero Macchina trasportabile su autoveicolo atta ad elevare una navicella ad altezze diverse
GB8304329D0 (en) * 1983-02-16 1983-03-23 Aerial Access Equip Control mechanism for access equipment
DE29708415U1 (de) * 1997-05-13 1997-07-24 Michaelis Maschinenbau GmbH, 28879 Grasberg Hubbühne
DE10144501A1 (de) * 2001-09-11 2003-04-03 Teupen Maschbau Gmbh Hubarbeitsbühne mit Hydraulik-Steuerung
RU2555073C2 (ru) * 2013-07-01 2015-07-10 Николай Евгеньевич Староверов Устройство для поворота детали на угол до 330 градусов (варианты)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2936847A (en) * 1959-02-02 1960-05-17 Jay M Eitel Mobile lifting equipment with extensible boom structure
US3035712A (en) * 1960-02-17 1962-05-22 Westinghouse Bremsen Gmbh Overload safety control apparatus for cranes
US3087581A (en) * 1960-03-07 1963-04-30 Pitman Mfg Company Fiberglas structural member and method of making same
US3547072A (en) * 1965-04-01 1970-12-15 Comitetul De Stat Pentru Cultu Device for indicating the position of the platform of cranes with articulated booms,especially camera cranes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2936847A (en) * 1959-02-02 1960-05-17 Jay M Eitel Mobile lifting equipment with extensible boom structure
US3035712A (en) * 1960-02-17 1962-05-22 Westinghouse Bremsen Gmbh Overload safety control apparatus for cranes
US3087581A (en) * 1960-03-07 1963-04-30 Pitman Mfg Company Fiberglas structural member and method of making same
US3547072A (en) * 1965-04-01 1970-12-15 Comitetul De Stat Pentru Cultu Device for indicating the position of the platform of cranes with articulated booms,especially camera cranes

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4687073A (en) * 1983-07-30 1987-08-18 Simon Engineering Dudley Limited Hydraulically elevatable access equipment
EP0217294A2 (en) * 1985-09-30 1987-04-08 FASSI GRU IDRAULICHE S.p.A. Highly maneuverable insulated man lifting aerial crane for use in servicing overhead high-voltage electrical transmission lines
US4679653A (en) * 1985-09-30 1987-07-14 Ruco Equipment Company, Inc. Highly maneuverable insulated man lifting aerial crane for use in servicing overhead high-voltage electrical transmission lines
EP0217294A3 (en) * 1985-09-30 1989-10-18 FASSI GRU IDRAULICHE S.p.A. Highly maneuverable insulated man lifting aerial crane for use in servicing overhead high-voltage electrical transmission lines
US4754840A (en) * 1987-10-07 1988-07-05 Jlg Industries, Inc. Leveling assembly for work platforms on articulating booms
US5082085A (en) * 1990-08-30 1992-01-21 Up-Right, Inc. Platform leveling apparatus
WO1992004515A1 (en) * 1990-08-30 1992-03-19 Up-Right, Inc. Platform leveling apparatus
US5249643A (en) * 1992-04-03 1993-10-05 Kidde Industries, Inc. Vehicular self-propelled aerial work platform and telescoping parallelogram boom therefor
US5379664A (en) * 1992-10-07 1995-01-10 United Kingdom Atomic Energy Authority Hydraulic manipulator
US5704498A (en) * 1996-09-25 1998-01-06 Kidde Industries, Inc. Transportable crane
AU714344B2 (en) * 1996-09-25 1999-12-23 Grove U.S. L.L.C. Transportable crane
US6390312B1 (en) 1998-02-27 2002-05-21 Jlg Industries, Inc. Lift structures and lifting arrangement therefor
US6488161B1 (en) 2000-05-02 2002-12-03 Jlg Industries, Inc. Boom mechanism
US20160108672A1 (en) * 2005-06-16 2016-04-21 Barjoh Pty Ltd Vehicle access system
US20110182706A1 (en) * 2010-01-22 2011-07-28 Marola Martin A Heavy Duty Vehicle Recovery System
US8690514B2 (en) * 2010-01-22 2014-04-08 Martin A. Marola Heavy duty vehicle recovery system

Also Published As

Publication number Publication date
GB1458506A (fi) 1976-12-15
AT351706B (de) 1979-08-10
SE390721B (sv) 1977-01-17
DE2408405A1 (de) 1974-08-22
FI53564B (fi) 1978-02-28
ATA142874A (de) 1979-01-15
FI53564C (fi) 1978-06-12
BE811162A (fr) 1974-06-17
CA992470A (en) 1976-07-06

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