JP2008273734A - Workbench fitting mechanism of vehicle for high lift work - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workbench fitting mechanism of a vehicle for high lift work structured to prevent interference between a workbench and a leveling device, in regard to a vehicle for high lift work wherein a boom head is arranged to be extended lower than the boom. <P>SOLUTION: In the vehicle for high lift work having a boom 7 fitted on a vehicle body freely to be hoisted, a boom head 23 arranged in the tip of the boom 7 so as to be extended under the boom 7 when the boom 7 is fallen in the nearly horizontal direction, and a workbench 8 fitted to the tip of the boom head 23 freely to oscillate and swing, a workbench fitting mechanism 20 for fitting the workbench to the boom head is structured of an oscillating member 24 fitted to a lower end of the boom head 23 in the upper end thereof freely to oscillate in the vertical direction and a swing mechanism 22 fitted to a lower end of the oscillating member 24 so as to swing the workbench 8. The swing mechanism 22 is arranged lower than a pivotal point 43 of the oscillating member 24 relative to the boom head 23. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a work platform mounting mechanism for an aerial work vehicle in which a work platform is attached to the boom head in an aerial work vehicle disposed so that a boom head extends downward from the boom.

A conventional aerial work vehicle is provided with a vertical post extending upward from the tip of the boom, and a work table is attached to the vertical post (see, for example, Patent Document 1). However, with this arrangement, the boom is overlaid on the vehicle body so as to extend obliquely downward, so that the storage space between the vehicle body and the boom is reduced, and the position of the work table in the storage state is reduced. There was a problem that the rideability deteriorated because it was higher from the car body. Therefore, an aerial work vehicle has been developed in which a boom head provided at the tip of the boom is disposed so as to extend downward, and a work table is attached to the lower end of the boom head.
JP 2004-001921 A

  However, when the boom head is arranged so as to extend downward with respect to the boom as described above, the work table and the floor surface of the work table are always kept horizontal regardless of the undulation angle of the boom when the work table is swung. There was a problem that the leveling device interfered.

  The present invention has been made in view of such a problem, and is configured so that the work table and the leveling device do not interfere with each other in an aerial work vehicle in which the boom head is arranged to extend downward from the boom. An object of the present invention is to provide a work platform mounting mechanism for an aerial work platform.

  In order to solve the above-mentioned problems, a work platform mounting mechanism for an aerial work vehicle according to the present invention includes a boom mounted on a vehicle body so as to be able to undulate at least, a boom head disposed at a tip portion of the boom, In an aerial work vehicle having a work platform that is swingable and swingable at a tip end portion of a boom head, the work platform is attached to the boom head, and an upper end portion is a lower end of the boom head. And a swinging mechanism attached to the lower end portion of the swinging member and swinging the work table. The swing mechanism is disposed below the pivot point of the swing member with respect to the boom head.

  At this time, it is preferable that the swing mechanism is disposed offset to the base end side of the boom.

  Further, in the work platform mounting mechanism for an aerial work platform according to the present invention, the work platform has a work platform bracket extending outward, and the swing mechanism has a shaft member that protrudes downward from the swing member. And when a work table is attached to the lower part of the swing member via a swing mechanism, a work table bracket is disposed below the shaft member, and the shaft member is disposed on the work table bracket from the lower end of the shaft member. It is preferably configured to be inserted and attached.

  When the workbench mounting mechanism according to the present invention is configured as described above, the swing mechanism is disposed below the pivot point of the swing member, so that the workbench or the workbench bracket during swinging operation and Interference with a mechanism (such as a leveling cylinder) that swings the swing member can be prevented. In addition, by placing the swing mechanism offset to the base end side of the boom, the workbench at the time of storage can be placed in front of the vehicle in plan view, shortening the front and rear length of the aerial work vehicle, Can be made compact. In addition, by reducing the working radius without shortening the total extension length of the boom, the falling moment can be reduced without reducing the maximum lift, thereby reducing the weight and reducing the weight of the vehicle. Can do. Furthermore, the length of the workbench bracket can be increased, and the working range of the work at a high place can be widened by widening the swing area of the workbench.

  Further, the work table bracket is arranged below the shaft member of the work table mounting device, and the shaft member is inserted into the work table bracket for attachment, thereby facilitating assembly work. . At this time, by attaching the fall prevention plate to the lower end portion of the shaft member, the work table bracket (work table) can be prevented from dropping from the work table mounting device even if the work table bracket is detached from the shaft member.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, before describing the work platform mounting structure for an aerial work platform according to the present invention, the work platform mounting structure on which the work platform mounting structure is mounted will be described with reference to FIGS. 1 and 2. The aerial work vehicle 1 has a driving cabin 2a in front of a vehicle body 2 and is configured based on a truck vehicle that can travel on front and rear wheels 3a and 3b. A swivel base 4 is attached to the front portion of the vehicle body 2 (behind the driving cabin 2a) and is configured to be swiveled by being driven by a swiveling motor (not shown). A base portion is pivotally connected to the upper portion of the swivel base 4, and a boom 7 is attached so as to be movable up and down in a vertical plane by the expansion and contraction operation of the hoisting cylinder 6.

  The boom 7 is configured such that a proximal boom 7a, an intermediate boom 7b, and a distal boom 7c are combined in a nested manner, and can be expanded and contracted by a built-in expansion cylinder (not shown). Here, the boom 7 has a three-stage expansion / contraction configuration, but may be a multi-stage expansion / contraction configuration including two or four or more booms.

  A work table 8 is attached to the tip of the tip boom 7c via a work table attachment mechanism 20 described later. The work table 8 has a work table mounting mechanism 20 that always keeps the floor surface of the work table 8 horizontal regardless of the angle at which the boom 7 is raised and lowered. ) Is configured to be possible.

  Outrigger jacks 9 that can be expanded in the width direction of the vehicle body 2 and can be expanded and contracted in the vertical direction are provided at four locations on the front, rear, left, and right sides of the vehicle body 2. When working at a high place, the operator widens and extends the left and right outrigger jacks 9 in the vehicle body width direction according to the relative positional relationship with surrounding obstacles, and projects the vehicle body 2 by lifting it downward.

  The work table mounting mechanism 20 will now be described with reference to FIGS. The work table mounting mechanism 20 further includes a swing mechanism 21 that swings the work table with respect to the boom 7 and a swing mechanism 22 that swings the head. A boom head 23 is attached to the distal end portion of the boom 7, that is, the distal end portion of the distal end boom 7c. The boom head 23 extends downward with the boom 7 lying down substantially horizontally.

  The swing mechanism 21 includes a swing member 24 attached to the tip of the boom head 23 so as to be swingable in the vertical direction, and a leveling cylinder 25 attached to the boom head 23 and the swing member 24. . A work table bracket 26 extending rearward from the lower part is attached to the rear part of the work table 8, and the front end of the work table bracket 26 swings to the lower end of the swing member 24 via the swing mechanism 22. It is mounted movably. Therefore, by operating the leveling cylinder 25 to expand and contract, the worktable bracket 26 can be swung in the vertical direction with respect to the boom head 23, and the expansion / contraction amount of the leveling cylinder 25 is adjusted according to the undulation angle of the boom 7. As a result, the floor surface of the work table 8 can always be kept horizontal.

  On the other hand, the swing mechanism 22 is attached to the side of the work table bracket 26 and a cylindrical shaft member 30 that has an upper end fixed to the swing member 24 and extends downward from the swing member 24. The oscillating motor 31, the worm gear (helical gear) 32 attached so as to cover the circumferential surface of the shaft member 30, and the worm (not shown) attached to the rotating shaft of the oscillating motor 31 and meshing with the worm gear 32. Screw gear) 33.

  The distal end portion of the worktable bracket 26 is cut into a C shape in a side view from the distal end side, and openings 26c and 26d for inserting the shaft member 30 from above are formed in the upper portion 26a and the lower portion 26b. Bearings 34 and 35 are attached to the upper portions 26a and 26b, and the shaft member 30 is rotatably supported by the worktable bracket 26.

  A worm fixing bracket 36 for fixing the worm gear 32 to the shaft member 30 is attached to the lower end portion of the worm gear 32. The worm fixing bracket 36 includes a cylindrical shaft fixing portion 36a and a flange portion 36b extending outward from the upper end of the shaft fixing portion 36a in a flange shape. The upper surfaces are in contact with each other and fastened with bolts 37 and nuts 38.

  The worm fixing bracket 36 is fixed to the shaft member 30 by a fixing pin bracket 39 shown in FIG. The fixing pin bracket 39 is mounted so as to be bent along the outer peripheral surface of the cylindrical shaft fixing portion 36a and to protrude from the substantially central portion of the fixing portion 39a to the inner peripheral side. It is comprised from the stop pin part 39b. Through holes are formed in the shaft fixing portion 36a of the shaft member 30 and the worm fixing bracket 36 so as to be aligned with each other, and the fixing portion 39b is inserted into the through holes and the fixing portion 39b is inserted into the shaft fixing portion. The worm gear 32 is fixed to the shaft member 30 by being fixed to the outer peripheral surface of 36a with the bolt 40.

  A bearing 44 is mounted between the lower end surface of the upper bearing 34 and the upper end surface of the worm gear 32, and the worktable bracket 26 that is about to fall downward with respect to the shaft member 30 is attached to the bearing 44. A worm gear 32 fixed to the shaft member 30 is supported via the intermediate member. Further, the lower end portion of the shaft member 30 slightly protrudes from the lower surface of the worktable bracket 26, and a disk-shaped drop prevention plate 41 is bolted to the lower surface of the shaft member 30 so as to cover the lower surface of the worktable bracket 26. 42 is attached. Even if the fixing pin bracket 39 is damaged by the fall prevention plate 41 and the worm fixing bracket 36 is separated from the shaft member 30 (that is, even if the worm gear 32 attempts to fall downward together with the work table bracket 26), The worktable bracket 26 is supported by the shaft member 30 by the fall prevention plate 41, and therefore does not fall from the worktable mounting mechanism 20.

  In such a swing mechanism 22, when the swing motor 31 is operated, the worm 33 rotates. However, since the worm gear 32 that meshes with the worm 33 is fixed to the shaft member 30, the worktable bracket 26 is pivoted. The work table 8 can be swung left and right around the member 30, whereby the work table 8 can be swung in the left and right direction.

  It is as follows when the effect by having the work-table attachment mechanism 20 as the above structures is put together. First, the boom head 23 is mounted so as to extend downward with the boom 7 lying down substantially horizontally, that is, with the boom 7 stored on the vehicle body 2 as shown in FIG. By attaching the work table 8 to the tip (lower end), the position of the work table 8 can be arranged below the boom 7 that is lying substantially horizontally in a side view. Therefore, since the floor surface of the work table 8 in the retracted state is located in the vicinity of the upper surface of the vehicle body 2, it is possible to improve the operator's ability to get on and off the work table 8 at the time of storage, and the steps for boarding are carried out. 2 need not be provided.

  Secondly, as shown in FIG. 4 and the like, the swing mechanism 21 and the swing mechanism 22 can be disposed within the height of the work table 8 in a side view, thereby improving the interruptability of the work point. Can be made. Third, the swing mechanism 22 can be disposed below the swing mechanism 21 (the leveling cylinder 25 and the pivot point 43 of the swing member 24 with respect to the boom head 23). Interference between the working table 8 or the working table bracket 26 and the leveling cylinder 25 or the like can be prevented.

  Fourthly, in this worktable mounting mechanism 20, as is clear from FIG. 4 and the like, the swing member 24 is below the boom 7 with respect to the boom head 23 extending downward from the tip boom 7c. And it is attached so that it may extend diagonally forward along the axial direction of this boom 7. As shown in FIG. That is, the boom head 23 and the swing member 24 are arranged in a “<” shape in a side view, and the swing center axis (the central axis of the shaft member 30) X of the work table 8 is the boom of the swing member 24. It is offset from the pivot point 43 with respect to the head 23 in the axial direction front of the boom 7 (the base end side of the boom 7). Thereby, the workbench 8 at the time of storage can be arrange | positioned ahead of a vehicle in planar view, the vehicle front-and-rear length of the aerial work vehicle 1 can be shortened, and it can make compact as a whole. In addition, by reducing the working radius without shortening the total extension length of the boom, the falling moment can be reduced without reducing the maximum lift, thereby reducing the weight and reducing the weight of the vehicle. Can do. In addition, the length of the workbench bracket 26 can be increased, and the swinging area of the workbench 8 can be widened to widen the work range in high-altitude work.

  Fifth, when the boom 7 is stored as shown in FIG. 1 by arranging the boom head 23 so as to extend downward with respect to the boom 7 and attaching the work table 8 to the lower end of the boom 7, Since the position of the tip portion is increased and the boom 7 can be disposed close to the horizontal, the space between the lower portion of the boom 7 and the upper surface of the vehicle body 2 is expanded, and the loading space on the vehicle body 2 can be expanded.

  Finally, a method of attaching the work table 8 to the work table attachment mechanism 20 (an assembly method of the swing mechanism 22) will be described. The description starts from a state in which the swing member 24, the leveling cylinder 25, and the shaft member 30 are attached to the boom head 23 as described above. First, the bearings 34 and 35 are attached to the upper part 26a and the lower part 26b of the worktable bracket 26, respectively. A swing motor 31 is attached to the side of the workbench bracket 26, and a worm 33 is attached to the rotating shaft. Next, the worm fixing bracket 36 is attached to the worm gear 32, and in this state, it is inserted together with the bearing 44 between the upper part 26a and the lower part 26b of the worktable bracket 26. Then, the work table bracket 26 is disposed below the shaft member 30 projecting downward from the lower end of the swing member 24, and the openings 26c and 26d of the work table bracket 26, the collar 43, the worm gear 32, and the worm fixing bracket. The shaft member 30 is inserted into 36.

  The shaft member 30 is inserted into the worktable bracket 26, the collar 43, the worm gear 32, and the worm fixing bracket 36, and the shaft member 30 is supported by the bearings 34 and 35, and the worm fixing bracket 36 is fixed to the fixing pin bracket 39. It uses to fix to the shaft member 30, and finally, the fall prevention plate 41 is attached to the lower surface of the shaft member 30.

  In this way, by attaching the worktable bracket 26 from below the worktable attachment mechanism 20 so as to insert the shaft member 30 constituting the worktable attachment mechanism 20, the attachment work can be facilitated. The shaft member 30 is configured such that the diameter of the shaft member 30 is reduced at the tip portion, so that the operation of inserting the shaft member 30 into the worktable bracket 26 from below is facilitated.

  Second and third embodiments of the worktable mounting mechanism according to the present invention are shown in FIGS. 7 and 8, and this configuration will be briefly described. In addition, the same number is attached | subjected about the same component as the above-mentioned embodiment, and description is abbreviate | omitted.

  Also in the second embodiment shown in FIG. 7, a work table mounting mechanism 120 is provided at the tip of the tip boom 7 c, and this work table mounting mechanism 120 includes a swing mechanism 121 and a swing mechanism 22. Since the swing mechanism 22 has the same configuration as described above, the description thereof is omitted. A swing mechanism 121 is configured by extending downward to the upper end of a boom head 123 fixed to the tip of the tip boom 7c and pivoting a swing member 124 via a pin 124a. A worktable bracket 26 is attached to the lower part of the swing member 124 via the swing mechanism 22 so as to be able to turn horizontally (swing freely). A leveling cylinder 125 is attached across the tip boom 7c and the swinging member 124, and leveling control is performed to extend and contract the leveling cylinder 125 to keep the floor surface of the work table 8 horizontal.

  Also in the third embodiment shown in FIG. 8, a work table mounting mechanism 220 is provided at the tip of the tip boom 7 c, and this work table mounting mechanism 220 includes a swing mechanism 221 and a swing mechanism 22. Since the swing mechanism 22 has the same configuration as described above, the description thereof is omitted. A swing mechanism 221 is configured by extending downward to a lower end of a boom head 223 fixed to the tip of the tip boom 7c and pivoting a swing member 224 via a pin 224a. A worktable bracket 26 is attached to the lower part of the swing member 224 via the swing mechanism 22 so as to be able to turn horizontally (swing freely). A leveling cylinder 225 is attached across the boom head 223 and the swing member 224, and leveling control is performed to extend and contract the leveling cylinder 225 and keep the floor surface of the work table 8 horizontal.

It is a side view of an aerial work vehicle equipped with a workbench mounting mechanism according to the present invention. It is a top view of the aerial work vehicle. It is a perspective view of a worktable attachment mechanism. It is a side view of a worktable attachment mechanism. It is sectional drawing which shows a head swing mechanism. It is a perspective view of a fixed pin bracket. It is a side view of the worktable attachment mechanism which concerns on 2nd Embodiment. It is a side view of the worktable attachment mechanism which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High-altitude work vehicle 2 Car body 7 Boom 8 Worktable 20 Worktable attachment mechanism 22 Swing mechanism 23 Boom head 24 Swing member 26 Worktable bracket 41 Drop prevention plate 43 Pivoting point

Claims (3)

A boom mounted at least on a vehicle body so as to be able to undulate, a boom head disposed at the tip of the boom, and a workbench attached to the tip of the boom head so as to be swingable and swingable. In an aerial work platform having a work platform attachment mechanism for attaching the work platform to the boom head,
A swing member having an upper end attached to the lower end of the boom head so as to be swingable in the vertical direction;
A swing mechanism attached to a lower end of the swing member and swinging the work table;
A work platform mounting mechanism for an aerial work vehicle, wherein the swing mechanism is disposed below a pivot point of the swing member with respect to the boom head.   The work platform mounting mechanism for an aerial work platform according to claim 1, wherein the swing mechanism is disposed to be offset toward a base end side of the boom. The workbench has a workbench bracket extending outwardly;
The swing mechanism has a shaft member projecting downward from the swing member;
When the work table is attached to the lower part of the swing member via the swing mechanism, the work table bracket is disposed below the shaft member, and the shaft member is placed on the work table bracket at the lower end of the shaft member. The work platform mounting mechanism for an aerial work vehicle according to claim 1, wherein the work platform mounting mechanism is configured to be inserted and mounted from a part.

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