WO2015170261A1 - Mécanisme de stabilisateur pour plate-forme de travail aérienne - Google Patents

Mécanisme de stabilisateur pour plate-forme de travail aérienne Download PDF

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Publication number
WO2015170261A1
WO2015170261A1 PCT/IB2015/053296 IB2015053296W WO2015170261A1 WO 2015170261 A1 WO2015170261 A1 WO 2015170261A1 IB 2015053296 W IB2015053296 W IB 2015053296W WO 2015170261 A1 WO2015170261 A1 WO 2015170261A1
Authority
WO
WIPO (PCT)
Prior art keywords
work platform
resilient member
arc shaped
shaped resilient
stabilizer arrangement
Prior art date
Application number
PCT/IB2015/053296
Other languages
English (en)
Inventor
Atul Chandra TRIPATHI
Tinu Thomas MEPPRATH
Amit KAMBOYA
Original Assignee
L&T Technology Services Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by L&T Technology Services Limited filed Critical L&T Technology Services Limited
Publication of WO2015170261A1 publication Critical patent/WO2015170261A1/fr

Links

Classifications

    • 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
    • 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
    • B66F11/042—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 actuated by lazy-tongs mechanisms or articulated levers

Definitions

  • the invention generally relates to a stabilizer arrangement for aerial work platforms and particularly an anti-tipping or anti-toppling arrangement for Scissors lift,
  • Aerial work platform devices are well known in the art and are extensively used for raising material and/or workers to elevated locations. The principal purpose of such devices is to provide a safe and efficient means for supporting a working platform at any desired elevation and they work on various lifting mechanisms.
  • Scissors lift is one of the known lifting machine used as a self-propelied type aerial work platform devices.
  • the scissors lift comprises a pair of vertically extensible scissors linicages mounted on a chassis in laterally spaced, parallel relationship, and a workin platform mounted on top of the linkages.
  • each of the scissors linkages comprises pairs of arms plvotaliy connected to one another at their ends and at their centres. The lowermost pairs of arms of the linkages are pivoially mounted at one end to the chassis.
  • a hydraulic drive, or lift, cylinder mechanism may be pivoially attached to the cross-bars extending between the lowermost pairs of arras of the linkages.
  • the hydraulic mechanism serves to turn the arms of the lower most pair about their pivotal axis to extend or retract the linkages and thereby to raise, or lower the working platform.
  • the chassis is mounted on wheels in most of the known aerial working platform, and a drive arrangement may be provided to move the lift from one location to another.
  • the chassis may further have an anii-tipping or anti-toppling arrangement for supporting the aerial work platform in the event one or more wheel is on an uneven surface or is driven into a pot hole.
  • Such an apparatus works normally by reducing the ground clearance to less than one inch, b deploying safety plates, when the platform of the aerial work equipment is elevated beyond a certain height.
  • the known anti-tipping or anti-toppling arrangement typically have one or more safety plates or bars, attached to the chassis of the aerial work platform devices.
  • the safety plates may be switched between a deployed and stowed position.
  • the safety plates are in deployed position when the aerial work platform device is in elevated position to reduce the ground clearance.
  • the safety plates remains in stowed position when the aerial work platform device is in folded or resting position.
  • arrangements for switching the safety plates between deployed and stowed position are complex and have various parts that in turn results in high cost and low reliability.
  • the present invention is directed to overcoming one or more of the problems as set forth above.
  • a stabilizer arrangement for a self- propelled aerial work platform vehicle having a work platform, a lifting section for elevating and lowering the work platform and a chassis for supporting the lifting section and at least two safety plates.
  • the safety plates may be provided for inhibiting tipping over of the aerial work platform vehicle.
  • the stabilizer arrangement includes a pushing element extending downward from the lifting section, at least two-linkage mechanism and an arc shaped resilient member. A first end of each linkage mechanism is coupled to each safety plate.
  • Each end of the arc shaped resilient member is hinged to a second end of each linkage mechanism, such that downward vertical movement of the work platform results in imparting a downward vertical movement to a center part of the arc shaped resilient member by the pushing element.
  • the arrangement being such that the vertical movement of the center part of the arc shaped resilient member results in hinged movement of the safety plates.
  • a stabilizer arrangement for a self- propelled aerial work platform vehicle having a work platform, a lifting section for elevating and lowering the work platform for supporting the lifting section and at least two safety plates for inhibiting tipping over of the aerial work platform vehicle.
  • the stabilizer arrangement includes a pushing element extending downward from the lifting section for vertically moveable up on rise of the work platform and down in response to lowering of the work platform.
  • the stabilizer arrangement further includes at least two linkage mechanism and an arc shaped resilient member. A first end of each linkage mechanism is coupled to each safety plate.
  • Each end of the arc shaped resilient member is hinged to a second end of each linkage mechanism, such that downward movement of the pushing element, beyond a predefined height, pushes a center part of the arc shaped resilient member to actuate the linkage mechanisms thereby imparting a hinged movement to the safety plates.
  • Figure 1 illustrates an isometric view of an exemplary aerial work platform
  • Figure 2 illustrates a cross section view of an exemplary stabilizer arrangement for a self- propelled aerial work platform according to an embodiment of the invention
  • Figure 3 illustrates a cross section view of the exemplary stabilizer arrangement for a self- propelled aerial work platform according to another embodiment of the invention
  • Figure 4 illustrates a partial isometric view of the exemplary stabilizer arrangement for a self- propelled aerial work platform according to an embodiment of the invention.
  • FIG. 1 illustrates an isometric view of an exemplary aerial work platform 10 that may accommodate disclosed stabilizer arrangement according to an embodiment of the invention.
  • the aerial work platform 10 shown in Figure 1 is only for illustration purpose.
  • the aerial work platform 10 may include chassis 12 supported on a plurality of wheels 14.
  • a lifting section 16 is provided on the chassis.
  • the lifting section 16 may include a plurality of scissor members arranged in a conventional criss-cross manner to elevate and support a work platform 18.
  • a lifting element 20 such as, but not limited to a hydraulic cylinder may be pivotally attached to a lower in board arm scissor member and pivotally attached to one of upper in board arm scissor member at the other end.
  • the lifting element 20 may raise or lower the work platform 18.
  • the aerial work platform 10 may further have an actuator frame 22 connected to the chassis 12 and a plurality of safety plates 24.
  • FIG. 2 and Figure 3 illustrates a cross sectional view of an exemplary stabilizer arrangement for a self- propelled aerial work platform in deployed and stowed positions respectively according to an embodiment of the invention.
  • the disclosed stabilizer arrangement 100 may include a pushing element 102 extending downward from the lifting section 16.
  • the pushing element 102 may be a cylindrical member with a contact surface mechanically connected to one of the scissor members.
  • the stabilizer arrangement 100 may further include at least two linkage mechanism 104.
  • one linkage mechanism 104 may be provided in proximity to each safety plate 24 and a first end 106 of each linkage mechanism 104 may be coupled to each safety plate 24 as illustrated.
  • each linkage mechanism 104 may have a plurality of linkage bars such that each bar may be hinged to the other bar and at least one of the linkage bars from the plurality of linkage bars may be connected to the actuator frame 22 through sliding pin joint 108.
  • each linkage mechanism 104 has at least two linkage bars 104a, 104b.
  • the disclosed stabilizer arrangement 100 may further include an arc shaped resilient member 1 10.
  • Each end 1 12 of the arc shaped resilient member 1 10 may be connected to a second end 1 14 of each linkage mechanism 104 through a sliding pin joint.
  • the arc shaped resilient member 110 may be a leaf spring.
  • a guiding member 122 may be provided to guide the vertical movement of the arc shaped resilient member 1 10 as illustrated in figure 4.
  • the guiding member 122 may be supported on the actuator frame 22 and may pass through an opening provided in the arc shaped resilient member 1 10.
  • the downward vertical movement of the work platform 18 may result in imparting a downward vertical movement to a centre part 1 16 of the arc shaped resilient member 1 10 through the pushing element 102.
  • the disclosed stabilizer arrangement 100 being such that the vertical movement of the centre part 1 16 of the arc shaped resilient member 1 10 results in hinged movement of the safety plates 24.
  • the disclosed stabilizer arrangement 100 may include a pushing element 102 extending downward from the lifting section 16.
  • the pushing element 102 may be a cylindrical member with a contact surface mechanically connected to one of the scissor members. The pushing element 102 may vertically moveable up on rise of the work platform 18 and down in response to lowering of the work platform 18.
  • the stabilizer arrangement 100 may further include at least two linkage mechanism 104.
  • one linkage mechanism 104 may be provided in proximity to each safety plate 24 and a first end 106 of each linkage mechanism 104 may be coupled to each safety plate 24 as illustrated.
  • each linkage mechanism 104 may have a plurality of linkage bars such that each bar may be hinged to the other bar and at least one of the linkage bars from the plurality of linkage bars may be connected to the frame 22 through a sliding pin joint 108.
  • each linkage mechanism 104 has at least two linkage bars 104a, 104b.
  • the disclosed stabilizer arrangement 100 may further include an arc shaped resilient member 1 10.
  • Each end 1 12 of the arc shaped resilient member 1 10 may be connected to a second end 1 14 of each linkage mechanism 104 through a sliding pin joint.
  • the arc shaped resilient member 110 may be a leaf spring.
  • the downward vertical movement of the work platform 18 beyond a predefined height pushes a centre part 1 16 of the arc shaped resilient member 1 10 to actuate the linkage mechanisms 104 thereby imparting a hinged movement to the safety plates 24.
  • the hinged movement of the safety plates 24 results in moving the safety plates 24 from a deployed position 1 18 to a stowed position 120 when the work platform 18 is lowered beyond a predefined height.
  • the safety plates 24 is preferably pivoted through an arc that is limited to 90 degree between deployed position 1 18 and stowed position 120.
  • the predefined height may be approximately 5 to 6 inch more than platform height in stowed position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

Des modes de réalisation de l'invention portent sur un élément de stabilisateur (100) pour un véhicule à plate-forme de travail aérienne auto-propulsé (10) ayant une plate-forme de travail (18), une section de levage (16) pour élever et abaisser la plate-forme de travail (18) et un châssis (12) pour porter la section de levage (16) et au moins deux plaques de sécurité (24). L'agencement de stabilisateur (100) peut comprendre un élément de poussée (102), au moins deux mécanismes de liaison (104) et un élément élastique en forme d'arc (110) porté sur un boîtier d'actionneur (22). Une première extrémité (106) de chaque mécanisme de liaison (104) peut être accouplée à chaque plaque de sécurité (24). Chaque extrémité (112) de l'élément élastique en forme d'arc (110) peut être articulée sur une seconde extrémité (114) de chaque mécanisme de liaison (104), de telle sorte qu'un mouvement vertical vers le bas de la plate-forme de travail (18) peut produire en résultat le fait de communiquer un mouvement vertical vers le bas à une partie centrale (116) de l'élément élastique en forme d'arc (110) par l'élément de poussée (102).
PCT/IB2015/053296 2014-05-06 2015-05-06 Mécanisme de stabilisateur pour plate-forme de travail aérienne WO2015170261A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN2268CH2014 2014-05-06
IN2268/CHE/2014 2014-05-06

Publications (1)

Publication Number Publication Date
WO2015170261A1 true WO2015170261A1 (fr) 2015-11-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2015/053296 WO2015170261A1 (fr) 2014-05-06 2015-05-06 Mécanisme de stabilisateur pour plate-forme de travail aérienne

Country Status (1)

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WO (1) WO2015170261A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170137270A1 (en) * 2015-11-16 2017-05-18 Zhejiang Dingli Machinery Co., Ltd Order picker for easy transfer of goods
WO2018185607A1 (fr) * 2017-04-03 2018-10-11 Minilifts Incorporated Limited Dispositif de levage compact

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4114854A (en) * 1977-06-10 1978-09-19 Pac-Craft Products, Inc. Scissors lift work platform
US5890737A (en) * 1997-01-31 1999-04-06 Skyjack, Inc Pothole protection mechanism for a lifting device
EP1713714B1 (fr) * 2004-01-06 2009-09-02 JLG Industries, Inc. Mecanisme de protection contre les nids de poule

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4114854A (en) * 1977-06-10 1978-09-19 Pac-Craft Products, Inc. Scissors lift work platform
US5890737A (en) * 1997-01-31 1999-04-06 Skyjack, Inc Pothole protection mechanism for a lifting device
EP1713714B1 (fr) * 2004-01-06 2009-09-02 JLG Industries, Inc. Mecanisme de protection contre les nids de poule

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170137270A1 (en) * 2015-11-16 2017-05-18 Zhejiang Dingli Machinery Co., Ltd Order picker for easy transfer of goods
WO2018185607A1 (fr) * 2017-04-03 2018-10-11 Minilifts Incorporated Limited Dispositif de levage compact

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