EP1340711B1 - Hebegerät mit einem Gelenkausleger in Form eines Doppeparallelogramms - Google Patents

Hebegerät mit einem Gelenkausleger in Form eines Doppeparallelogramms Download PDF

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Publication number
EP1340711B1
EP1340711B1 EP03009866A EP03009866A EP1340711B1 EP 1340711 B1 EP1340711 B1 EP 1340711B1 EP 03009866 A EP03009866 A EP 03009866A EP 03009866 A EP03009866 A EP 03009866A EP 1340711 B1 EP1340711 B1 EP 1340711B1
Authority
EP
European Patent Office
Prior art keywords
boom assembly
riser
assembly
articulated parallelogram
parallelogram boom
Prior art date
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
EP03009866A
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English (en)
French (fr)
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EP1340711A1 (de
Inventor
Robert D. Backer
Michael F. Goodrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JLG Industries Inc
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JLG Industries Inc
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Publication date
Application filed by JLG Industries Inc filed Critical JLG Industries Inc
Priority claimed from EP98101372A external-priority patent/EP0856487B1/de
Publication of EP1340711A1 publication Critical patent/EP1340711A1/de
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Publication of EP1340711B1 publication Critical patent/EP1340711B1/de
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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
    • B66F11/046—Working platforms suspended from booms of the telescoping type

Definitions

  • the present invention relates to a lift apparatus; and more particularly, to a lift apparatus, such as an aerial work platform, having an articulated parallelogram boom assembly according to the preamble of claim 1.
  • a lift apparatus such as an aerial work platform, having an articulated parallelogram boom assembly according to the preamble of claim 1.
  • Such a list apparatus is known from US 3 807 575 A.
  • One object of the present invention is to provide a lift apparatus, such as an aerial work platform, having a greater maximum working height without increasing the retracted height.
  • a low profile self propelled aerial work platform representing an embodiment of the present invention includes a super-structure support frame 1, having vertically extending plates 2 upon which counterweights, not shown, are adapted to be mounted.
  • the support frame 1 is mounted on a turntable 3 carried by a vehicle chassis 4.
  • An articulated parallelogram boom assembly 5 is operatively connected between parallel upwardly projecting plate portions 1a of the support frame 1 and a riser 6.
  • the riser 6 is also connected to the proximate end portion of a telescopic boom assembly 7 having a work platform 8 mounted on the distal end thereof.
  • the articulated parallelogram boom assembly 5 includes a lower boom assembly having pairs of parallel, laterally spaced compression and tension arms 9 and 10, respectively, extending between the support frame 1 and a floating frame 11.
  • the compression and tensions arms 9 and 10 are pivotally connected to the support frame 1 as at 12 and 13, respectively, and to the floating frame as at 14 and 15, respectively. As shown in Fig. 1, in the retracted position, the compression and tension arms 9 and 10 extend downwardly from the frame 1 to the floating frame 11.
  • the articulated parallelogram boom assembly 5 also includes an upper boom assembly having a pair of parallel, laterally spaced compression arms 16 and a tubular tension arm 17 extending between the riser 6 and the floating frame 11.
  • the compression arms 16 and the tubular tension arm 17 are pivotally connected to the riser 6 as at 18 and 19, respectively, and to the floating frame 11 as at 20a and 20b, respectively.
  • the compression arms 16 and the tubular tension arm 17 extend downwardly from the floating frame 11 to the riser 6.
  • FIG. 5 illustrates a planar bottom view of the tubular tension arm 17.
  • the tubular tension arm 17 has a hole 42 formed in a bottom wall thereof.
  • the hole 42 accommodates the hydraulic cylinder 21 such that the rod of the hydraulic cylinder 21 extends up into the tubular tension arm 17, and is pinned to the side walls of the tubular tension arm 17.
  • two pairs of reinforcement plates 40 are attached to and project downwardly from the tubular tension arm 17.
  • the reinforcement plates 40 serve as pivot mounting points 44 for a pair of tension links 33.
  • the hydraulic cylinder 21 is pinned at 22 and at 23 on the longitudinal center lines of the lower compression arms 9 and the tubular tension arm 17, respectively.
  • the hydraulic cylinder 21 is retracted, the articulated parallelogram boom assembly 5 is in the folded position, as shown in Fig. 1, and is in the elevated position, as shown in Fig. 2, when the hydraulic cylinder 21 is extended. Throughout the range of motion of the articulated parallelogram boom assembly 5, the hydraulic cylinder 21 remains vertical.
  • a boom lift cylinder 24 is also pivotally connected along the centerline of the frame 1, above the hydraulic cylinder 21, between the riser 6, as at 18, and the telescopic boom assembly 7, as at 26. Accordingly, the boom lift cylinder 24 and the compression arms 16 share a common pivot point 18.
  • the remaining components on the telescopic boom assembly 7 are conventional and include a master hydraulic cylinder 27 for controlling a slave cylinder 28 on the distal end of the telescopic boom assembly 7 which, together, maintain the work platform 8 in a horizontal position during the raising and lowering of the articulated parallelogram boom assembly 5 and the luffing of the telescopic boom assembly 7 with boom lift cylinder 24.
  • the hydraulic cylinder 21 is nested between the pairs of arms 9 and 10
  • the boom lift cylinder 24 is nested between the compression arms 16, above the hydraulic cylinder 21.
  • Both the master cylinder 27 and the cylinder for telescoping the telescopic boom assembly 7 are also disposed along the centerline of the frame 1.
  • Figs. 3a and 3b illustrate cross-sections of the parallelogram boom assembly 5 along lines 3a-3a and 3b-3b in Fig. 2.
  • the riser 6 is formed from parallel plates 31 and a transverse plate 32.
  • the tubular tension arm 17 is disposed between the parallel plates 31, and sidewalls of the tubular tension arm 17 are pinned to lower portions of the parallel plates 31 extending below the transverse plate 32.
  • a pivot pin 35 pivotally attaches the compression arms 16 to the riser 6 with a boss 34 between each compression arm 16 and plate 31 such that the parallel plates 31 are disposed between the compression arms 16.
  • the support frame 1 includes upwardly projecting plate portions 1a to which both pairs of the compression and tension arms 9 and 10 are pivotally attached.
  • the compression arms 9 are pinned to the inside of a respective one of the plate portions 1a.
  • the tension arms 10 each have lugs 60 attached thereto forming a fork between which a respective plate portion 1a is pinned.
  • Fig. 7 illustrates a top view of the lower boom assembly of the articulated parallelogram boom assembly 5, and shows the pivot connections between the tension arms 10 and the plate portions 1a. Consequently, the tension arms 10 are disposed further apart from one another than the compression arms 9.
  • the parallel plates 31 of the riser 6 are spaced apart a smaller distance than the parallel plate portions 1a of the frame 1. As shown in Fig. 1, this arrangement permits the tubular tension arm 17 connected to the parallel plates 31 to nest between the tension arms 10, and when nested, the pivot point 19 for the tubular tension arm 17 is disposed below the pivot point 13 for the tension arms 10. As further shown in Figs. 3a and 3b, the pair of compression arms 16, the pair of tension arms 10, and the pair of compression arms 9 are spaced apart substantially the same distance to provide a very stable parallelogram assembly. Because of the stable parallelogram assembly of the lower boom assembly, the floating frame 11 is maintained in a vertical orientation throughout the range of motion of the articulated parallelogram boom assembly 5.
  • Fig. 4a illustrates a cross-section view of the articulated parallelogram boom assembly 5 looking in the direction of arrows 4a-4a
  • Fig. 4b illustrates the opposite side of the floating frame 11 as compared to Fig. 4a
  • the floating frame 11 is formed from parallel plates 52 and transverse plates 54 and 56 (see also Fig. 2).
  • the compression arms 9 are pinned to a respective plate 52.
  • the tension arms 10 and the compression arms 16 each have lugs attached thereto forming a fork between which a respective plate 52 is pinned.
  • Fig. 6 illustrates a top down view of the upper boom assembly of the articulated parallelogram assembly 5, and shows the pivot connections between the compression arms 16 and the floating frame 11.
  • Fig. 6 illustrates a top down view of the upper boom assembly of the articulated parallelogram assembly 5, and shows the pivot connections between the compression arms 16 and the floating frame 11.
  • FIG. 7 shows the pivot connections between the tension arms 10 and the floating frame 11 (see also Fig. 2).
  • the tubular tension arm 17 is pinned between plates 52.
  • a cylindrical housing 58 passes through the side walls of the tubular tension arm 17, and the cylindrical housing 58 is pinned to the plates 52.
  • the links 33 extend diagonally down from the two pairs of parallel reinforcement plates 40 through a hole in the transverse plate 54, and, as shown in Fig. 2, attach to the end of the compression arms 9 at pivot point 46.
  • Fig. 8 illustrates a top down view of the compression arms 9.
  • the compression arms 9 have a block 70 welded therebetween.
  • Two pairs of lugs 72 extend from the block 70, and form forks between which a respective one of the links 33 is pinned as at 46 in Figs. 1 and 2.
  • the pivot point 46 lies in a plane formed between respective extensions of the longitudinal center lines of the compression arms 9.
  • Fig. 4b shows a slot section 50 formed in the upper portion of the floating frame 11.
  • the slot section 50 accommodates the telescopic boom assembly 7 in the retracted position as shown in Fig. 1. Consequently, the telescopic boom assembly 7 slopes downwardly from the riser 6 in the retracted position.
  • three guide blocks 62 e.g., wear pads, for guiding the telescopic boom assembly 7 to the retracted position, are disposed about the slot section 50.
  • each link 33 is pivotally connected to one of the reinforcing plates 40 as at 44.
  • the pivot point 44 is disposed further from the floating frame 11 than the pivot point 20b for the tubular tension arm 17.
  • Each link 33 is further pivotally connected to a respective compression arm 9 as at 46.
  • the links 33 extend diagonally relative to the pivotal connections 14 and 20b, so that the link pivot connection 44 is on one side of the compression arm 16 pivot connection 20b, and the link pivot connection 46 is on the other side of the compression arm 9 pivot connection 14; whereby, during the actuation of the hydraulic cylinder 21 to pivot the compression arms 9 and 16 relative to each other, the links 33 will synchronize the movement of the upper parallelogram assembly relative to the lower parallelogram assembly.
  • the perpendicular moment arm at the lower boom assembly of the articulated parallelogram boom assembly 5 i.e., the distance, measured perpendicularly, between a line passing through the longitudinal axis of the link 33 including the pivot point 46 and a line parallel thereto passing through the pivot point 14
  • the perpendicular moment arm for the upper boom assembly i.e., the distance, measured perpendicularly, between a line passing through the longitudinal axis of the link 33 and the pivot point 44 and a line parallel thereto passing through the pivot point 20b.
  • the perpendicular moment arms for the lower and upper boom assemblies gradually become equal at about the point when the lower and upper boom assemblies are parallel, and then the perpendicular moment arm for the upper boom assembly becomes larger than the perpendicular moment arm for the lower boom assembly.
  • the perpendicular moment arm of the upper boom assembly is substantially larger than the perpendicular moment arm of the lower boom assembly by about the same margin that the perpendicular moment arm of the lower boom assembly exceeded the perpendicular moment arm of the upper boom assembly in the retracted position.
  • the perpendicular moment arms of the upper and lower boom assemblies are 69.12mm and 114.04mm in the retracted position, 107.64mm and 123.59mm in the parallel position, and 113.88mm and 68.03mm in the fully extended position.
  • the above values are given by way of example only, and in no way limit the possible perpendicular moment arm values of the present invention.
  • the height of the frame 1, the length of the floating frame 11, and the length of the riser 6 can be increased without increasing the overall retracted height of the machine. Accordingly, the highest point of the machine in the retracted position is approximately six feet, six inches or less. As one skilled in the art will realize, however, the overall dimensions of the machine could be increased or decreased.
  • the increased height of the frame 1, the increased length of the floating frame 11, and the increased length of the riser 6 provides for at least a first and/or second advantage.
  • the first advantage is an increase in the working height that the machine can achieve.
  • the second advantage is a decrease in the length of the telescopic boom assembly 7 and/or the length of the articulated parallelogram boom assembly 5 without a decrease in the working height as compared to conventional aerial work platforms.
  • Fig. 9 illustrates a top view of the aerial work platform according to the present invention. As Figs. 2 and 9 show, the aerial work platform according to the present invention has no tail swing and minimal front swing.
  • one skilled in the art can balance the increased working height versus reduced front swing trade-off to meet those characteristics.
  • Figs. 1-2, 6-7, and particularly Fig. 9 show, the longitudinal axes of the articulated parallelogram boom assembly 5, the hydraulic lift cylinder 21, the telescopic boom assembly 7, and the boom lift, cylinder 24 lie within the same vertical plane (i.e., are in-line).
  • the positioning of the hydraulic cylinder 21 in cooperation with the links 33 sets up a lift geometry which minimizes the loads on both the hydraulic cylinder 21 and the links 33, and maintains the loads on the hydraulic cylinder 21 and the links 33 substantially constant over the range of motion of the articulated parallelogram boom assembly 5.
  • the load on the hydraulic cylinder 21 could be reduced by positioning the hydraulic cylinder 21 closer to the frame 1. Doing so, however, presents a clearance problem with the bottom of the hydraulic cylinder 21. Accordingly, the length of the hydraulic cylinder 21 would have to be decreased; thus, decreasing the maximum possible working height of the machine. Depending on desired operating characteristics one skilled in the art can balance the load versus maximum working height trade-off to meet those characteristics.
  • the rod of the hydraulic cylinder 21 could be pinned between the compression arms 16. This would require forming a larger version of hole 42, and forming a similar hole in the top of the tubular tension arm 17 to accommodate the cylinder portion of the hydraulic cylinder 21. To make such an accommodation would require increasing the width of the tubular tension arm 17 with the resulting ripple effect being an overall increase in the width of the articulated parallelogram boom assembly 5.
  • articulated parallelogram boom assembly 5 may be applied to devices other than self propelled aerial work platforms.

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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)

Claims (5)

  1. Hebegerät mit:
    einer Oberwagen-Rahmenhalterung (1);
    einem Steiger (6);
    einer Parallelogramm-Gelenkauslegeranordnung (5), die funktionsmäßig zwischen der Oberwagen-Rahmenhalterung (1) und dem Steiger (6) eingebunden ist, wobei die Parallelogramm-Gelenkauslegeranordnung (5) umfasst:
    einen Schweberahmen (11),
    eine untere Parallelogramm-Auslegeranordnung (9, 10), die funktionsmäßig zwischen der Oberwagen-Rahmenhalterung (1) und dem Schweberahmen (11) eingebunden ist,
    eine obere Parallelogramm-Auslegeranordnung (16, 17) die funktionsmäßig zwischen dem Schweberahmen (11) und dem Steiger (6) angeordnet ist, und
    einer ersten Hebeanordnung (21) zum Anheben und Absenken der Parallelogramm-Gelenkauslegeranordnung (5),
    dadurch gekennzeichnet dass:
    ein Teleskopausleger (7) mit dem Steiger (6) verbunden ist;
    eine zweite Hebeeinrichtung (24) zum Anheben und Absenken des Teleskopausiegers (7) vorgesehen ist;
    wobei der Schweberahmen (11) eine Aussparung (50) in seinem oberen Abschnitt umfasst; und
    der Teleskopausleger (7) in der Aussparung (50) sitzt, wenn die Parallelogramm-Gelenkauslegeranordnung (5) vollständig abgesenkt ist und der Teleskopausleger (7) vollständig abgesenkt ist.
  2. Hebegerät nach Anspruch 1, bei dem der Teleskopausleger (7) teilweise verschachtelt in der oberen Teleskopauslegeranordnung (16) sitzt, wenn die Parallelogramm-Gelenkauslegeranordnung (5) vollständig abgesenkt ist und der Teleskopausleger (7) vollständig abgesenkt ist.
  3. Hebegerät nach Anspruch 1, das ferner umfasst:
    eine untere Parallelogramm-Auslegeranordnung (9, 10), die funktionell zwischen der Oberwagen-Rahmenhalterung (1) und dem Schweberahmen (11) eingebunden ist, wobei die untere Parallelogramm-Auslegeranordnung (9, 10) von der Oberwagen-Rahmenhalterung (1) nach unten zum Schweberahmen (11) abfällt, wenn die Parallelogramm-Gelenkauslegeranordnung (5) vollständig abgesenkt ist.
  4. Hebegerät nach Anspruch 1, das ferner umfasst:
    eine obere Parallelogramm-Auslegeranordnung (16, 17), die funktionell zwischen dem Schweberahmen (11) und dem Steiger (6) eingebunden ist,
    wobei die obere Parallelogramm-Auslegeranordnung (16, 17) von dem Schweberahmen (11) nach unten zu dem Steiger (6) abfällt, wenn die Parallelogramm-Gelenkauslegeranordnung (5) vollständig abgesenkt ist.
  5. Hebegerät nach Anspruch 1, das ferner umfasst:
    eine Arbeitsplattform (8), die funktionell mit der Parallelogramm-Gelenkauslegeranordnung (5) verbunden ist; und
    einen Teleskopausleger (7), der zwischen dem Steiger (6) und der Arbeitsplattform (8) eingebunden ist.
EP03009866A 1997-01-31 1998-01-27 Hebegerät mit einem Gelenkausleger in Form eines Doppeparallelogramms Expired - Lifetime EP1340711B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US3710597P 1997-01-31 1997-01-31
US37105P 1997-01-31
EP98101372A EP0856487B1 (de) 1997-01-31 1998-01-27 Hebegerät mit einem Gelenkausleger in Form eines Doppeparallelogramms

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP98101372A Division EP0856487B1 (de) 1997-01-31 1998-01-27 Hebegerät mit einem Gelenkausleger in Form eines Doppeparallelogramms

Publications (2)

Publication Number Publication Date
EP1340711A1 EP1340711A1 (de) 2003-09-03
EP1340711B1 true EP1340711B1 (de) 2006-06-21

Family

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Application Number Title Priority Date Filing Date
EP03009867A Expired - Lifetime EP1340712B1 (de) 1997-01-31 1998-01-27 Hebegerät mit einem Gelenkausleger in Form eines Doppeparallelogramms
EP03009866A Expired - Lifetime EP1340711B1 (de) 1997-01-31 1998-01-27 Hebegerät mit einem Gelenkausleger in Form eines Doppeparallelogramms

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP03009867A Expired - Lifetime EP1340712B1 (de) 1997-01-31 1998-01-27 Hebegerät mit einem Gelenkausleger in Form eines Doppeparallelogramms

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMO20130095A1 (it) * 2013-04-12 2014-10-13 Palfinger Platforms Italy S R L Piattaforma aerea a ridotto ingombro.
CN104741910B (zh) * 2013-12-31 2017-01-18 中核武汉核电运行技术股份有限公司 一种整体式成组同步螺栓拉伸机安装小车
CN106144978B (zh) * 2016-08-17 2018-09-25 徐州海伦哲专用车辆股份有限公司 一种混合臂高空作业车
CN112079294B (zh) * 2020-09-25 2022-02-15 山河智能装备股份有限公司 一种货物装卸装置及货物装卸车
CN112407155A (zh) * 2020-12-09 2021-02-26 中船绿洲镇江船舶辅机有限公司 一种双平行四边形四连杆机构小艇收放装置及其使用方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807575A (en) * 1972-06-13 1974-04-30 Merrick Hydraulics Inc Elevating devices
US4019604A (en) * 1975-06-16 1977-04-26 Fabtek, Inc. Elevating platform apparatus
US5129480A (en) * 1991-03-21 1992-07-14 Kidde Industries, Inc. Articulated parallelogram boom assembly synchronization device
US5584356A (en) * 1995-05-31 1996-12-17 Kidde Industries, Inc. Centerline double riser with single lift cylinder and link for a low profile self propelled aerial work platform

Also Published As

Publication number Publication date
EP1340711A1 (de) 2003-09-03
EP1340712B1 (de) 2006-06-28
EP1340712A1 (de) 2003-09-03

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