WO2011085168A1 - Aménagement de levage à bras articulé - Google Patents

Aménagement de levage à bras articulé Download PDF

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Publication number
WO2011085168A1
WO2011085168A1 PCT/US2011/020470 US2011020470W WO2011085168A1 WO 2011085168 A1 WO2011085168 A1 WO 2011085168A1 US 2011020470 W US2011020470 W US 2011020470W WO 2011085168 A1 WO2011085168 A1 WO 2011085168A1
Authority
WO
WIPO (PCT)
Prior art keywords
boom
turntable
coupled
linear actuator
bell crank
Prior art date
Application number
PCT/US2011/020470
Other languages
English (en)
Inventor
James Allen Donaldson
Original Assignee
Genie Industries, Inc.
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 Genie Industries, Inc. filed Critical Genie Industries, Inc.
Publication of WO2011085168A1 publication Critical patent/WO2011085168A1/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
    • 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
    • B66F11/046—Working platforms suspended from booms of the telescoping type

Definitions

  • the present disclosure relates to aerial lift systems and vehicles provided with such lift systems.
  • One type of aerial lift includes a vehicle onto which a pivotable turntable is mounted, with the turntable having a series of adjustable, and possibly, extendable booms onto which a platform or basket is mounted.
  • a lower and an upper boom are used to position a platform or basket away from the vehicle to a desired location so that a person within the basket or platform may perform work or maintenance on an object that is otherwise difficult to access.
  • the boom it is desirable for the boom to allow the basket to extend beyond the footprint of the vehicle.
  • the center of mass of the vehicle system i.e., including the boom, basket, the person or persons in the basket and whatever other cargo is in the basket, migrates.
  • Several measures can be taken to overcome a tendency of the vehicle to tip when the boom is extended away from the vehicle.
  • the weight and/or footprint of the vehicle are increased so that the vehicle system is more stable.
  • it is undesirable to increase the weight of the vehicle because it makes transporting the vehicle to a work site that much more difficult.
  • the surface near the work site is unstable, such as may result from a presence of sand or mud, the more that the vehicle system weighs, the more likely the vehicle will become stuck during maneuvering.
  • Another measure used to stabilize the vehicle in the elevated position calls for increasing the track width and/or the wheel base, whereby the foot print of the vehicle is increased, which improves stability.
  • the larger the footprint the less maneuverable the vehicle becomes.
  • a wider vehicle is prevented from accessing certain locations that it may have otherwise been able to access.
  • Another commonly employed measure involves providing a counterweight on the turntable so that the counterweight rotates with the turntable.
  • the counterweight balances the boom extending in a direction away from the counterweight, which is called a "forward" direction regardless of the angle of the rotation of the turntable.
  • the forward and rearward directions are defined with respect to the turntable, not with respect to the vehicle or any object that is being accessed from the basket.
  • the counterweight provides an undesirable imbalance force when the upper boom is rotated in a rearward direction.
  • this measure commonly includes taking additional measures to prevent the boom from moving too far rearward.
  • the positions of the booms are controlled by hydraulic cylinders.
  • hydraulic cylinders By knowing the extent that the hydraulic cylinders are extended, the combinations of boom positions leading to tipping can be avoided.
  • such a system relies on having sensors to measure positions of the hydraulic cylinders, a controller, and frequent calibration of the sensors to ensure sufficient measurement accuracy.
  • an upright member is provided between the lower and upper booms.
  • the upright is actively controlled via hydraulic feedback to maintain it in a vertical position.
  • a disadvantage of such a system is that it requires additional hydraulic cylinders managed by complex valving and additional sensors. Furthermore, the system may require periodic calibration. Also, by introducing an intermediate link, i.e., the upright, additional play is introduced. The amount of play is exacerbated at the operator's station in the "basket. Such play undermines the operator's sense of security.
  • an aerial lift system which includes a vehicle, a turntable coupled to the vehicle, a lower boom coupled to the turntable at a first turntable pivot, a lower linear actuator coupled between the turntable and the lower boom, and a mechanical link coupled to the turntable at a second turntable pivot.
  • the turntable is coupled to the vehicle with an axis of rotation of the turntable being substantially vertical.
  • the upper side of the turntable includes pivot joints for at least a lower boom and a mechanical link.
  • the axis of rotation about these first turntable and second turntable pivots in some embodiments, is substantially perpendicular to the axis of rotation of the turntable with respect to the vehicle.
  • a bell crank is coupled to: the lower boom at a first bell-crank pivot and to the mechanical link at a second bell-crank pivot.
  • the system includes an upper boom coupled to the lower boom at a boom-to-boom pivot.
  • the system also includes an upper linear actuator coupled to the bell crank at a third bell crank pivot and coupled to the upper boom.
  • the linear actuators are any suitable linear actuator such a hydraulic cylinder.
  • the mechanical link in some embodiments, includes two members. The lower linear actuator passes between the two members of the mechanical link as it couples between the lower boom and the turntable.
  • the upper and lower booms are constrained in such a manner that they are prevented from accessing positions in which vehicle tipping may occur.
  • the operator basket which may extend 50 feet or more from the vehicle, during positioning of the basket or due to the wind acting upon the basket. The operator feels more secure and comfortable when the basket bounces to a lesser degree.
  • At least one embodiment of the invention obviates the need for complicated electronic/hydraulic control and hydraulic actuators used to limit rear instability. Furthermore, the mechanical system does not need calibration, as needed with a system using control valves and actuators. Furthermore, service intervals for some embodiments of the invention described by the present disclosure, which are mechanically based, are likely longer than service intervals for prior systems which may include sensors, controllers, and complex valving. BRIEF DESCRIPTION OF THE DRAWINGS
  • Figure l shows an aerial lift system in which the booms are in a stowed position for transportation and in which the upper and lower hydraulic cylinders are fully retracted;
  • Figure 2 shows an aerial lift in which the upper hydraulic cylinder is fully extended and the lower hydraulic cylinder is fully retracted
  • Figure 3 shows an aerial lift in which the upper and lower hydraulic cylinders are fully extended
  • Figure 4 shows an aerial lift in which the upper hydraulic cylinder is fully retracted and the lower hydraulic cylinder is fully extended.
  • an aerial lift system 10 includes a vehicle 12 with an aerial lift 13.
  • vehicle 12 is a wheeled vehicle.
  • vehicle 12 may be a tracked vehicle.
  • vehicle 12 is not self-propelled.
  • a turntable 14 is rotatably mounted on vehicle 12.
  • element 14 is a support member which is fixed to vehicle 12.
  • a lower boom 16 is coupled to turntable 14 via a pivot joint 18, at or near to a proximal end of the lower boom 16.
  • a lower hydraulic cylinder 20 is pivotally coupled between turntable 14 and lower boom 16. Generally, a distal end of the lower hydraulic cylinder 20 is coupled to the lower boom 16 at some distance from the proximal end of the boom 16.
  • a proximal end of the lower hydraulic cylinder 20 extends through a slot in turntable 14 to provide stowage space for lower hydraulic cylinder 20.
  • Lower hydraulic cylinder 20 is trunnion that is in turn mounted to the turntable in one embodiment, with the trunnion joint being located along the body of lower hydraulic cylinder 20, i.e., not connected at the proximal end of lower hydraulic cylinder 20.
  • a mechanical link 22 is also coupled to turntable 14 via a pivot joint 23.
  • mechanical link 22 comprises two members 24 and 26. In the embodiment shown in Figure 1, lower hydraulic cylinder 20 passes between members 24 and 26 of mechanical link 22.
  • a second end of lower boom 16 pivotally couples with an upper boom 28 at a pivot 29
  • aerial lift 13 includes a bell crank 30 which is pivotally coupled to mechanical link 22 and lower boom 16.
  • Bell crank 30 is also pivotally coupled to an upper hydraulic cylinder 32 at one end of the upper hydraulic cylinder with the other end of upper hydraulic cylinder 32 coupled to upper boom 28.
  • Upper hydraulic cylinder 32 couples with upper boom 28 away from either end of upper boom 28.
  • Upper boom 28 is coupled to lower boom 16 at a close end of upper boom 28.
  • Basket assembly 34 includes a platform and/or cage in which an operator, and possibly tools and/or cargo, may be lifted.
  • Basket assembly 34 includes pivotal links and hydraulic cylinders so that it may be raised, lowered, extended, etc. with respect to the far end of the upper boom 28.
  • basket assembly 34 may include components to provide users with automated, or semi-automated, leveling to ensure that basket assembly 34 remains substantially level.
  • an extendible link 36 is provided between the basket assembly 34 and the upper boom 28.
  • the extendible link 36 provides users with apparatus for extending a length of the upper boom 28, and thus extending a reach of the basket assembly 34.
  • a counterweight 38 (shown in Figures 2-4), may be included.
  • counterweight 38 has a counterweight portion located on both sides of the lower boom 16. For illustration purposes, only the counterweight portion behind lower boom 16 is shown in Figures 2-4.
  • upper hydraulic cylinder 32 is shown in a fully extended position while lower hydraulic cylinder 20 is shown in a fully retracted position.
  • upper boom 28 and lower boom 16 can be adjusted to position basket assembly 34 close to the desired location, i.e., rough location.
  • basket assembly 34 can be raised, lowered, and rotated independently of upper boom 28 and lower boom 16. As shown in Figure 2, basket assembly 34 is in a lower position, but can be raised as needed to obtain further height above vehicle 12.
  • bell crank 30 has three pivots: a lower boom pivot 30a, a mechanical link pivot 30b, and an upper hydraulic cylinder pivot 30c.
  • upper hydraulic cylinder pivot 30c is below mechanical link 22. This limits the extent to which upper hydraulic cylinder 32 can extend and thus limits the rotation of upper boom 28 in the rearward direction.
  • both upper hydraulic cylinder 32 and lower hydraulic cylinder 20 are shown in their fully extended positions, i.e., a mostly vertical position.
  • basket assembly 34 can be raised from the position shown in Figure 3 to attain a slightly higher end position.
  • extendible link 36 can be extended to its furthest position.
  • lower hydraulic cylinder 20 is extended, lower boom 16 is caused to rotate about pivot joint 18.
  • Lower boom 16 acts on bell crank 30, the motion of which is constrained by being coupled to mechanical link 22.
  • the pivot joint of bell crank 30, which is coupled to upper hydraulic cylinder 32, is rotated so that it is in the interior of the obtuse angle formed between upper boom 28 and lower boom 16.
  • Lower hydraulic cylinder 20 has analogous hydraulic lines 44 and 46.
  • a lower operator-controlled actuator 48 and an upper operator-controlled actuator 50 may be provided for operation from within the basket assembly 34.
  • actuators 48 and 50 are push-pull levers.
  • Actuators 48 and 50 control hydraulic pressure supplied in lines 40, 42, 44, and 46.
  • Other embodiments, including electronically actuated actuators, may be used.
  • FIG 4 the combination of lower hydraulic cylinder 20 fully extended and upper hydraulic cylinder 32 fully retracted is shown.
  • Bell crank 30 is in the same position in Figure 4 as in Figure 3.
  • Both Figures 3 and 4 show lower boom 16 in the furthest forward position accessible (which is approximately 25 degrees rotated toward the rearward direction from a vertical axis in the embodiments shown in Figures 3 and 4).
  • counterweight 38 counterbalances the weight of basket assembly 34, upper boom 28, and whatever cargo is in basket assembly 34.
  • aerial lift 13 is prevented from accessing rearward positions that might result in the vehicle tipping.
  • the disclosed system provides an advantage over prior art systems in that vehicle tipping is prevented by a purely mechanical system .
  • at least position sensors and a control system are used to ensure that tipping positions are not accessed. Such systems depend on the sensors providing an accurate measurement to the control system, and the control system maintaining control over the hydraulic cylinders. According to embodiments of the present invention, tipping is prevented without relying on sensors and actuators.
  • upper boom 28 and lower boom 16 are directly linked with their range of motion controlled via hydraulic cylinders, 20 and 32, mechanical link 22, and bell crank 30.
  • an additional link is included between upper and lower booms. As each link between the turntable and the basket adds to the amount of play experienced at the basket, it is an advantage, according to some embodiments of the present disclosure, that no such additional link is employed.
  • Another advantage, according to the present disclosure, is that the operator can directly control hydraulic cylinders 20 and 32 without relying on an electronic controller.
  • a controller is interposed between operator controls and linear actuators to ensure that undesirable positions of associated booms are not accessed.
  • an additional link is provided between upper and lower booms and a complex control scheme is employed to ensure that undesirable positions are not accessed.
  • hydraulic cylinders 20 and 32 are shown in Figures 1-4.
  • any type of linear actuator such as electromechanical motors (such as a stepper motor), a linear motor, etc. can be used in place of hydraulic cylinders.

Landscapes

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

Abstract

Un levier coudé et une pièce de raccordement mécanique sont compris dans un système de levage aérien pour contraindre mécaniquement le mouvement d'un mécanisme de levage aérien à deux bras afin d'empêcher le système de levage aérien de prendre des positions instables. Habituellement, un système de levage aérien est accouplé à un véhicule par l'intermédiaire d'une plaque tournante. La plaque tournante comprend un contrepoids sur un côté arrière de la plaque tournante afin d'équilibrer les bras et l'équipement associé lorsqu'ils sont étendus vers l'avant. Si les bras se trouvent dans certaines positions arrière, voire verticales, le contrepoids peut amener le véhicule à s'incliner et de telles positions instables sont à éviter. Grâce à l'installation du levier coudé près de l'articulation entre les bras supérieur et inférieur, le levier coudé s'accouplant au niveau des articulations au bras inférieur, à la pièce de raccordement mécanique et à un cylindre hydraulique supérieur, les bras du système de levage aérien sont mécaniquement contraints pour éviter l'inclinaison du véhicule.
PCT/US2011/020470 2010-01-11 2011-01-07 Aménagement de levage à bras articulé WO2011085168A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/685,354 2010-01-11
US12/685,354 US20110168490A1 (en) 2010-01-11 2010-01-11 Articulated Boom Lifting Arrangement

Publications (1)

Publication Number Publication Date
WO2011085168A1 true WO2011085168A1 (fr) 2011-07-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2011/020470 WO2011085168A1 (fr) 2010-01-11 2011-01-07 Aménagement de levage à bras articulé

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US (1) US20110168490A1 (fr)
WO (1) WO2011085168A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9139409B2 (en) * 2013-03-12 2015-09-22 Oshkosh Corporation Weighted boom assembly
CN106395697B (zh) * 2016-08-24 2019-10-01 浙江鼎力机械股份有限公司 伸缩连接组件及高空作业平台
US20180132477A1 (en) * 2016-11-16 2018-05-17 ADC Custom Products, LLC Transportable Observation Station
US10467932B1 (en) 2017-04-06 2019-11-05 Kooima Company Mobile elevating apparatus
US10991279B1 (en) 2017-04-06 2021-04-27 Kooima Ag, Inc. Mobile elevating apparatus
FR3140361B1 (fr) * 2022-09-30 2024-08-30 Antony Blin Bras Déployable

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US4643320A (en) * 1983-12-16 1987-02-17 Hiab Export A/S Crane bracket for mounting over the chassis side members of a truck
US5249643A (en) * 1992-04-03 1993-10-05 Kidde Industries, Inc. Vehicular self-propelled aerial work platform and telescoping parallelogram boom therefor
US6173810B1 (en) * 1997-06-26 2001-01-16 Genie Industries, Inc. Trailer personnel lift with a level sensor and manually set outriggers
US7246684B2 (en) * 2004-02-26 2007-07-24 Jlg Industries, Inc. Boom lift vehicle and method of controlling boom angles

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Publication number Priority date Publication date Assignee Title
US4643320A (en) * 1983-12-16 1987-02-17 Hiab Export A/S Crane bracket for mounting over the chassis side members of a truck
US5249643A (en) * 1992-04-03 1993-10-05 Kidde Industries, Inc. Vehicular self-propelled aerial work platform and telescoping parallelogram boom therefor
US6173810B1 (en) * 1997-06-26 2001-01-16 Genie Industries, Inc. Trailer personnel lift with a level sensor and manually set outriggers
US7246684B2 (en) * 2004-02-26 2007-07-24 Jlg Industries, Inc. Boom lift vehicle and method of controlling boom angles

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