JP4865264B2 - Aerial work platform - Google Patents

Description

  The present invention relates to an aerial work vehicle including a boom that has a base end attached to a vehicle body and that can freely move up and down, and a workbench that is attached to the tip of the boom so as to freely vibrate.

As described in, for example, Patent Document 1, the above-described aerial work vehicle has a swivel mounted on a vehicle body that can be swung with respect to the vehicle body. The boom is pivotably connected to the vehicle body by telescopic movement, and the entire boom is expanded and contracted by expansion and contraction of an expansion cylinder inside the boom in which a plurality of boom members are nested. Also, a bending / extending arm is attached to the tip of the boom, and this bending / extending arm comprises a connecting member provided at the tip of the boom so as to be swingable in the vertical direction and a head member provided at the tip of the connecting member. The head member is provided with a work table via a vertical post member that is always kept vertically extended by the leveling mechanism regardless of the boom movement. An operator who has boarded the workbench moves the workbench to a desired or arbitrary height by moving the boom up and down, turning, and extending, bending and extending the bending arm, and vibrating the workbench neck. Can be made.
JP 2004-43129 A

By the way, in an aerial work platform equipped with a bending / extending arm as described above, the structure around the bending / extending arm 106 and the work table 107 is as shown in FIGS. 6 (a) and 6 (b). The vertical post 108 that is the center position of the neck vibration is located at a position that is offset by a length Y with respect to the axis L _{3 in} the longitudinal axis direction of the boom 105. Therefore, even when the platform 107 is fired to the axis _{L 3} (with respect to the axis _{L 4} of the head member 123 that passes through the center of the vertical post 108) by neck vibration angle theta ₁ vibration of the boom 105, as shown in FIG. 6 (a), the person when workbench 107 is located at the position of the head member 123 side for connecting the bending arm 106 and the vertical post 108 to the axis _{L 3} is, as shown in FIG. 6 (b) in than if the head member 123 located on the opposite position with respect to the work table 107 is the axis L _3, a large distance between the substantially center position and the axis L ₃ of the work table 107.

Therefore, better in the case of FIG. 6 (a), the than in FIG. 6 (b), the torsional moment _{M 1} acting from the work table 107 to the axis _{L 3} about the boom 105 is large, it can be said that. Thus, in the case of FIG. 6 (b), since the weight of the work platform 107 and the head member 123 across the arm 106 is balanced on the torsional moment _{M 1} is small, the axis _{L 3} of the worktable 107 The inclination angle in the vertical direction (paper surface direction) is relatively small. However, in the case of FIG. 6A, the torsional moment M ₁ acts greatly, and since the work table 107 and the head member 123 are both located on the same side with respect to the arm 106, the work table 107 is inclined more greatly. The working table 107 tilted in such a manner that the side far from the boom 105 was lowered, and the riding comfort of the work table 107 was poor.

In order to solve this problem, as shown in FIG. 6C, the work table 107 is conventionally attached to the work table bracket 109 so as to be inclined so that the vertical post 108 side is lowered. there even when the neck vibration in the state of FIG. 6 (a), in the configuration can offset the inclination of the worktable 107 by the torsional moment M ₁ as described above. However, workbench 107 neck vibration angle θ is 0 °, i.e., when the approximate center of the work table 107 is positioned on the axis L ₄ are, to have a tilt with respect to the worktable bracket 109 as described above The influence of the mounting configuration of the work table 107 becomes conspicuous, and the work table 107 is tilted forward in the direction of the boom 105. Therefore, although the neck vibration angle θ is substantially horizontal state workbench 107 when in the vicinity of 90 °, rather approximate center of the neck vibration angle θ is 0 ° (workbench 107 is positioned at a position on the axis L ₄ In the case where the work table 107 vibrates from the state shown in FIG. 6A to the state shown in FIG. 6B, the inclination angle of the work table 107 changes drastically. There was a problem that this is also a factor that makes the ride uncomfortable.

  In view of the problems as described above, an object of the present invention is to provide an aerial work vehicle including a work platform that is comfortable for an operator who rides on the work table during neck vibration of the work table. .

In order to solve the above-mentioned problems, an aerial work vehicle according to the present invention includes a boom that is mounted at least on a movable vehicle body so as to be able to move up and down, and a post member that is pivotably pivoted up and down at the tip of the boom. (For example, the vertical post 8 in the embodiment) and the post member that is provided between the boom and the post member and swings up and down in accordance with the undulation of the boom to maintain the axis of the post member extending substantially vertically. It has a leveling mechanism (for example, the leveling cylinder 54 in the embodiment) and a work table that is mounted in a horizontal state and freely swingable around the axis of the post member, and acts around the longitudinal axis of the boom from the work table side. as worktable in a state where the boom undergoing torsional moment is twisted about the longitudinal axis is substantially horizontal state to a longitudinal axis of the boom with respect to the axis is vertical post members The direction in which the twisting moment acts is inclined in the opposite direction.

Further, in the aerial work vehicle having the above-described configuration, the swing center of the work table is configured to be located at a position offset in the width direction of the boom with respect to the axis of the longitudinal axis of the boom in a plan view. The axis of the post member is tilted with respect to the vertical direction so that the work table becomes substantially horizontal with the torsional moment caused by the offset acting when the head vibrates toward the swing center of the work table with respect to the boom. It is preferable to make it.

Furthermore, in the aerial work vehicle having the above configuration, the boom is configured to have a boom head member (for example, the boom head 60 in the embodiment) attached to the tip, and the axis of the post member attached to the boom head member is It is preferable that the boom head member is attached to the boom so as to be inclined with respect to the vertical direction.

On the other hand, in the aerial work vehicle having the above configuration, the boom is configured to have a boom head member (for example, the boom head 60 in the embodiment) attached to the tip, and the axis of the post member is inclined with respect to the vertical direction. The post member may be attached to the boom head member.

According to the aerial work vehicle related to the present invention, the axis of the post member attached to the tip of the boom is inclined in the direction opposite to the direction in which the torsional moment acts around the longitudinal axis of the boom with respect to the vertical direction. A post member is attached. For this reason, even when the workbench vibrates in the direction in which the torsional moment acting on the boom side from the workbench increases, the post member is attached to the tip of the boom with the mounting structure as described above with respect to the substantially horizontal direction of the workbench. The tilt and the tilt of the work table with respect to the substantially horizontal direction due to the action of a large torsional moment cancel each other, and the tilt of the work table can be kept small.

Moreover, since the workbench is attached to the post member so as to vibrate in a plane perpendicular to the axis of the post member, the workbench has a small boom moment that acts on the boom side from the workbench. Even when the neck vibrates at a position on the axial line in the axial direction, the work table does not tilt forward in the boom direction, and the change in the tilt angle when the work table vibrates in the neck can be kept small. Since this is possible, there is no possibility that the rider feels uncomfortable riding on the work table.

The effect of suppressing the tilt of the work table due to the torsional moment acting on the boom side from the work table as described above, in particular, is that the bending arm is attached to the tip of the boom head member so as to be swingable in the vertical direction. A high-priced work vehicle with a post member attached to the tip of the head and a work table attached to the post member, where the center position of the neck vibration of the work table is offset from the longitudinal axis of the boom Is obtained. In other words, when the workbench vibrates on the same side as the post member with respect to the boom axis (bend-extension arm axis), the torsional moment acting on the boom from the workbench side rather than the neck vibration on the opposite side of the post member. In an aerial work vehicle with a large height, even if the work table vibrates on the same side as the post member with respect to the axis of the boom, the torsion of the post member relative to the tip of the boom It is possible to suppress a change in the tilt angle of the work table due to the moment.

In addition, the configuration of the boom tip portion that cancels the tilt caused by the torsional moment acting on the boom side from the work table is such that the axis of the post member attached to the boom head member that is fixedly inserted into the boom tip is fixed vertically. The boom head member may be attached to the boom so as to make an angle as described above with respect to the direction, or the post member itself may be attached to the boom head member so as to make an angle as described above. You may do it. In any of the above mounting configurations, since the axis of the post member is inclined with respect to the vertical direction, if the workbench vibrates in the direction in which the torsional moment acting on the boom side increases from the workbench, The tilt of the table can be kept small.

  Hereinafter, a preferred embodiment of an aerial work vehicle according to the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 shows an example of the aerial work vehicle.

  The aerial work vehicle 1 is capable of traveling with front and rear wheels 3 a and 3 b on the front, rear, left and right sides of the vehicle body 2, and is constructed based on a truck vehicle having a driving cabin 2 a at the front of the vehicle body 2. Each of the left and right sides of the vehicle body 2 is provided with jacks 10, 10,... That support the vehicle body 2 while projecting to the side of the vehicle body 2 and grounding the lower end portion. A pivoting post 4 is provided. A turning motor (not shown) is provided inside the vehicle body 2, and the turning post 4 can be turned by the operation of the turning motor.

  Further, a boom 5 is attached by pivoting the base end portion to the turning post 4, and the boom 5 is raised and lowered by a raising and lowering cylinder 51. The boom 5 is configured such that the base boom 5a and the tip boom 5b are combined in a nested manner, and the entire boom 5 can be expanded and contracted in the longitudinal axis direction by a built-in extension cylinder (not shown).

  As shown in FIG. 2, a bending / extending arm 6 is provided at the tip of the boom 5, and a vertical post 8 is pivotally connected to the tip of the bending / extending arm 6 via a head member 23 so as to be swingable up and down. . The vertical post 8 is controlled to swing by a leveling cylinder 54 disposed between the head member 23 and the vertical post 8 so that the vertical post 8 always extends vertically regardless of whether the boom 5 is raised or lowered. Retained. The work table 7 is attached to the vertical post 8 that is always held vertically in this manner so that it can be swiveled horizontally (necked freely) by a swiveling motor (not shown) via the work table bracket 9. Is always held horizontally regardless of the undulations of the boom 5. Further, on the left side of the rear portion of the vehicle body 2, a step 12 for getting on and off the work table 7 in the retracted state as shown in FIG. On the left side of the side of the vehicle body 2, a tool box 13 having a sliding door and accommodating a ladder, a stepladder, and the like is installed.

  An operation device 11 is provided on the work table 7, and an operator who has boarded the work table 7 manually operates the first operation lever 11 a of the operation device 11, so that the swing motor, the raising and lowering cylinder 51, and the telescopic cylinder are controlled. When the operation is controlled, the boom 5 is swung, raised and lowered, and expanded and contracted, and the second operating lever 11b of the operating device 11 is manually operated to extend and retract the bending / extending cylinder 53 to bend and extend the bending / extension arm 6. The movement is controlled so that the work table 7 can be moved in the vertical direction. For this reason, by operating the first operating lever 11a and the second operating lever 11b in combination, the work table 7 can be moved to a desired or arbitrary high position.

  Next, the bending arm 6 will be described. As shown in FIG. 2, the bending / extending arm 6 is pivotally connected to a boom head 60 whose proximal end is inserted in the longitudinal direction at the distal end of the distal end boom 5 b having a hollow cross section, and the distal end is pivotally connected to the head member 23. It is comprised from the connected member 20 made. The connecting member 20 is a plate and includes a pair of upper arms 21 and a lower arm 22 each extending parallel to the longitudinal axis direction of the boom 5. One end of the pair of upper arms 21 is at the front end of the boom head 60. The other end is pivotally connected to the side surface of the head member 23 by a pivot pin 32 so as to be swingable in the vertical direction.

  One end of each of the pair of lower arms 22 is pivotally coupled to both side surfaces of the boom head 60 at a position below the pivot pin 31 by a pivot pin 33 so as to be swingable in the vertical direction. In the figure, it is pivotally connected to both side surfaces of the head member 23 at the lower position by pivot pins 34 so as to be swingable in the vertical direction. Thus, a parallel link mechanism is formed by the upper arm 21, the lower arm 22, the head member 23, and the boom head 60.

  A rod-side end portion of the bending / extending cylinder 53 is pivotally connected to the inner side surface of the upper arm 21 by a pivot pin 35. Further, the bottom side end portion of the bending / extending cylinder 53 is pivotally connected to a pivot pin 33 that pivotally connects the base end portion of the lower arm 22 to the boom head 60. That is, the bending / extending cylinder 53 is attached in a direction in which the connecting member 20 extends so as to be spanned between the upper arm 21 and the lower arm 22. For this reason, when the bending / extending cylinder 53 is expanded and contracted, the length between the pivoting pin 33 and the pivoting pin 35 changes, and the bending / extending arm 6 bends / extends vertically with respect to the boom 5.

  A leveling cylinder 54 is provided in the head member 23, a bottom side end portion of the leveling cylinder 54 is pivoted to the head member 23 by a pivot pin 37, and a rod side end portion of the leveling cylinder 54 by a pivot pin 36. Is pivoted to the vertical post 8. The lower end of the vertical post 8 is swingably attached to the head member 23 by a pivot pin 38. The leveling cylinder 54 oscillates the vertical post 8 so that the vertical post 8 is always extended vertically regardless of the undulation angle of the boom 5. For this reason, the work table 7 attached to the vertical post 8 can be always held in a horizontal state by the expansion and contraction of the leveling cylinder 54.

Further, as shown in FIG. 2 (b), the oscillating center point P of the workbench 7, (with respect to the axis of the bending arm 6) to the longitudinal axis direction of the axis L ₂ of the boom 5 in a plan view boom 5 is configured to be located at a position offset by a length X in the width direction. Therefore, when the work table 7 vibrates to the same side as the vertical post 8 with respect to the boom 5 (with respect to the bending arm 6), the work table 7 is opposite to the vertical post 8 with respect to the boom 5. in than when the neck vibration, torsional moment acting from the workbench 7 to the axial line L ₂ about the boom 5 is large.

  The operation of the turning motor (not shown) for turning the boom 5, the raising / lowering cylinder 51 for raising / lowering, the expansion / contraction cylinder for extending / contracting, and the bending / extending cylinder 53 for bending / extending the bending / extending arm 6 are based on operation signals from the operation device 11, respectively. This is done by controlling the supply and discharge of hydraulic oil discharged from a hydraulic pump that is driven by transmitting the rotational driving force of the engine disposed in the vehicle body 2. This supply / exhaust control includes a turning control valve, a raising / lowering control valve, an expansion / contraction control valve, and a bending / extension control valve in a hydraulic unit provided in the vehicle body 2 corresponding to the turning motor, the raising / lowering cylinder 51, the expansion / contraction cylinder, and the bending / extension cylinder 53. This is done by controlling the opening of each control valve.

  Here, the boom head 60 attached to the tip boom 5b and the tip of the tip boom 5b will be described with reference to FIGS. The distal end boom 5b has a hollow rectangular cross-sectional shape, and is telescopically inserted into the proximal end boom 5a. A boom head 60, which is substantially L-shaped in side view and has a hollow rectangular cross-sectional shape like the tip boom 5 b, is telescoped into the tip portion of the tip boom 5 b, and is fastened by bolts 84, 85, 86. It is fixed to the tip boom 5b at three places (a total of six places on the left and right side surfaces of the boom head 60).

  A pivot hole 67 through which the pivot pin 31 pivoting one end of the upper arm 21 is inserted is formed in the front end portion of the boom head 60 so as to penetrate left and right. Thus, a pivot hole 68 through which a pivot pin 33 that pivots one end of the lower arm 22 is inserted is formed so as to penetrate in the right and left direction at a position close to the lower portion of the boom head 60.

  The boom head 60 has left and right sides of the upper plate 60b and the lower plate 60c in a state in which both end portions of two plate members each having a U-shaped upper plate 60b and a lower plate 60c project inward and face each other. The side plates 60a and 60a are welded to each other. With such a configuration, the boom head 60 has a hollow space extending in the longitudinal axis direction and has a hollow rectangular cross-sectional shape. Further, four substantially prismatic spacers 71, 71, 72, 72 are welded to the side plate side plates 60a, 60a so as to extend vertically. Further, spacers 73 are welded to the bottom surfaces of the side plates 60a and 60a, the lower plate 60c, the spacers 71 and 71, and the upper surface of the base end portion of the boom head 60 so as to extend to the left and right of the boom head 60. Thus, the boom head 60 has a structure in which the left and right side plates 60a, 60a, the upper plate 60b, the lower plate 60c, and the spacers 71, 71, 72, 72, 73 are integrated.

  Among the spacers 71, 71, 72, 72, the spacers 71, 71 are attached so as to be close to the pivot holes 68, 68 so as to face each other with the side plates 60 a, 60 a interposed therebetween. Spacers 72 and 72 are similarly attached to the base end side of 60 so as to face each other with the side plates 60a and 60a interposed therebetween.

  The side plates 60a, 60a are provided with mounting holes 64, 64, mounting holes 65, 65 and mounting holes 66, 66 penetrating in the thickness direction. Further, the spacers 71 and 71 are penetrated in the thickness direction, and both have a threaded portion so as to overlap the mounting holes 74 and 74 and the mounting holes 65 and 65 positioned so as to overlap the mounting holes 64 and 64. The mounting holes 75, 75 are further formed in the spacers 72, 72 so as to penetrate the spacers 72, 72 in the thickness direction and have threaded portions so as to overlap the mounting holes 66, 66. ing. Then, by screwing the six bolts into the mounting holes 74, 74, 75, 75, 76, 76, the boom head 60 fitted and inserted into the tip boom 5b is fastened to the tip boom 5b at six locations. The

  As shown in FIGS. 4A and 4B, the cross sections of the spacers 71, 71, 72, 72, 73 all have a substantially wedge shape. Of the spacers 71, 71 on the tip side of the boom head 60, the spacer 71 welded to one side plate 60 a is tapered downward, and the other spacer 71 is tapered upward. That is, the spacers 71 and 71 are fixed to the side surface 60a so that their vertical directions are opposite to each other and their tapered surfaces face each other. Similarly, the spacers 72, 72 are also fixed to the side surface 60a so that their vertical directions are opposite to each other and their tapered surfaces face each other.

Such spacer 71, because ... the construction of a center line L ₁ extending vertically divided boom head 60 to the left or right without coincide with the vertical line L ₀ passing through the cross section center of the boom head 60, The center line L ₁ forms an angle θ _{0 in the} clockwise direction on the paper surface with respect to the vertical line L ₀ . In other words, the boom head 60 is not attached to the tip boom 5b in a substantially horizontal state, but is attached in an inclined state (the inclination angle is the angle θ ₀ described above).

As described above (see FIG. 2B), when the work table 7 vibrates to the same side as the vertical post 8 with respect to the boom 5 (with respect to the bending arm 6), the work table 7 is used. The tilting of the work table 7 at this time is performed in a state in which a torsional moment generated when the swing center P point of 7 is located at a position offset with respect to the boom 5 acts from the work table 7 around the axis L _{2 of the} boom 5. Is set to a size necessary for the work table 7 to be in a substantially horizontal state. Although the angle θ ₀ is about several degrees at most, it can be arbitrarily set by changing the shape of the spacers 71, 71,.

In the aerial work vehicle in which the boom head 60 is configured as described above, with reference to FIG. 5, the change in the tilted state of the work table 7 due to the neck vibration with the vertical post 8 of the work table 7 as the swing center. The description will be made in comparison with the conventional case. As described above, in the aerial platforms according to the present invention, since the configuration boom head 60 is attached to the tip boom 5b at an angle theta _0, as shown in FIG. 5, pivot the boom head 60 It is inclined by an angle theta ₀ on the plane in the clockwise direction with respect to the bending arm 6 also vertical line L ₀ to be sintered. Furthermore, the angle on the plane in the clockwise direction with respect to always vertical line L ₀ regardless vertical post 8 that is attached to the bending arm 6 through a head member 23, the neck vibration angle of the workbench 7 whose longitudinal The state is inclined by θ ₀ .

In the case where the head 7 vibrates on the same side as the vertical post 8 with respect to the bending / extending arm 6 from the state where the working table 7 is located behind the bending / extending arm 6, the working table 7 extends around the longitudinal axis of the boom 5. A twisting moment M ₀ acts counterclockwise on the paper surface. At this time, in the prior art, the work table 7 has a mounting structure that is inclined with respect to the work table bracket 9 such that the side of the vertical post 8 is lowered (to the lower right in FIG. 5). the action and to try to tilt the platform 7 by the M ₀ to the plane lower left, becomes substantially horizontal state workbench 7.

On the other hand, in the present invention, when the workbench 7 vibrates on the same side as the vertical post 8 with respect to the bending arm 6, the longitudinal axis direction of the vertical post 8 is an angle θ _{0 with} respect to the vertical line L ₀ . Due to the tilted mounting structure and the action of tilting the work table 7 by the torsional moment M ₀ toward the lower left side of the drawing, the work table that vibrates the neck is inclined to the lower right side of the drawing of FIG. And a state in which the vertical post 8 is not inclined at an angle θ _{0 with} respect to the vertical direction (unlike the present invention, 6.0). In other words, the work table 7 is slightly inclined to the left of the drawing (the work table 7 'in FIG. 5 is inclined at an angle of about 2.0 °) or substantially horizontal. It becomes a state. Thus, for biased mounting construction for top boom 5b of the boom head 60 in the present invention, the direction in which the torsional moment M ₀ the platform 7 is applied from the workbench 7 about the axis of the longitudinal axis of the boom 5 increases Even if the work table 7 vibrates in the neck, the rider comforts the rider on the work table 7.

If the workbench 7 is (rearward of the bending arm 6) Neck vibration behind the boom 5, torsional moment M ₀ of the longitudinal axis around the boom 5 is hardly action, conventionally, workbench The influence of the mounting structure in which 7 is inclined so that the side of the vertical post 8 is lower with respect to the workbench bracket 9 appears, and the workbench 7 is inclined forward.

On the other hand, in the present invention, the workbench 7 is inclined toward the right side of the paper surface by the mounting configuration in which the longitudinal axis direction of the vertical post 8 is inclined by the angle θ _{0 with} respect to the vertical line L ₀ (in FIG. 5). Since the work table 7) and the work table 7 are not inclined with respect to the work table bracket 9 (with respect to the vertical post 8), the work table 7 will not be turned forward. Note that the angle θ ₀ is set to such an extent that the ride comfort on the workbench 7 does not deteriorate due to this inclination (approximately 1.6 °). Since the work table 7 which has been a problem as a factor is not behind the boom 5 when the work table 7 is located behind the boom 5, the change in the inclination angle due to the neck vibration of the work table 7 can be suppressed. The ride comfort of the base 7 is improved.

  When the work table 7 vibrates to the opposite side of the vertical post 8 with respect to the bending / extension arm 6 from the state of being located behind the boom 5, conventionally, the work table 7 is in relation to the work table bracket 9. The mounting structure is inclined so that the side of the vertical post 8 is lowered (lower left in FIG. 5). By this mounting structure and the action of tilting the work table 7 by twisting moment to the lower right of the paper, The workbench 7 changes from a state of leaning forward to a substantially horizontal state. For this reason, the change in the inclination angle of the work table 7 is large and the ride comfort is bad.

On the other hand, in the present invention, the workbench 7 is inclined toward the right side of the paper surface by the mounting configuration in which the longitudinal axis direction of the vertical post 8 is inclined by the angle θ _{0 with} respect to the vertical line L ₀ (in FIG. 5). In the work table 7 ″, the inclination angle with respect to the horizontal plane is about 2.9 °), and since the change in the inclination is small compared to when the work table 7 is located behind the boom 5, the work table 7 The riding comfort associated with the neck vibration of the work table 7 can be improved as compared with the case of tilting forward.

  From the above, the working table 7 is directed from the same side as the vertical post 8 to the opposite side of the vertical post 8 with respect to the bending / extension arm 6 by the configuration of mounting the boom head 60 to the tip boom 5b as in the present invention. When the head vibrates (or from the side opposite to the vertical post 8 toward the same side), since the relative change in the inclination of the work table 7 due to the neck vibration of the work table 7 is small, boarding the work table 7 It is possible to improve the ride comfort for the worker who performs.

Although the preferred embodiments of the present invention have been described so far, the scope of the present invention is not limited to the above-described embodiments. That is, in the embodiment described above, the boom head 60 is attached to the angle theta ₀ form a top boom 5b with respect to the vertical line L _0, not limited to the above configuration, the boom head 60 and below direction attached to the top boom 5b to match the vertical line L _0, may be mounted at an angle theta ₀ with respect to the vertical line L ₀ to the head member 23 towards the vertical post 8.

  Here, the effects achieved in the present invention are summarized as follows. That is, in the aerial work vehicle according to the present invention, the substantially vertical axis of the post member attached to the tip of the boom is opposite to the direction in which the torsional moment acts around the longitudinal axis of the boom with respect to the vertical direction. A vertical post is attached to tilt in the direction. For this reason, even when the workbench vibrates in the direction in which the torsional moment acting on the boom side increases from the workbench, the workbench with respect to the substantially horizontal direction of the workbench with the above-described mounting configuration with respect to the boom tip of the vertical post The tilt and the tilt of the work table with respect to the substantially horizontal direction due to the action of a large torsional moment cancel each other, and the tilt of the work table can be kept small.

  In addition, since the workbench is attached to the post member so as to vibrate in a plane perpendicular to the axis of the post member in a substantially vertical direction, the workbench has a torsional moment acting on the boom side from the workbench. Even when the neck vibrates at a position on the longitudinal axis of a small boom, the work table does not tilt forward in the direction of the boom, and the tilt angle changes when the work table vibrates the neck. Since it can be kept small, there is no possibility that the rider feels uncomfortable riding on the work table.

  The effect of suppressing the tilt of the work table due to the torsional moment acting on the boom side from the work table as described above, in particular, is that the bending arm is attached to the tip of the boom head member so as to be swingable in the vertical direction. A high-priced work vehicle with a post member attached to the tip of the head and a work table attached to the post member, where the center position of the neck vibration of the work table is offset from the longitudinal axis of the boom Is obtained. In other words, when the workbench vibrates on the same side as the post member with respect to the boom axis (bend-extension arm axis), the torsional moment acting on the boom from the workbench side rather than the neck vibration on the opposite side of the post member. In an aerial work platform with a large height, even if the work bench vibrates on the same side as the post member with respect to the axis of the boom, it is It is possible to suppress a change in the tilt angle of the work table due to the moment.

  Further, the configuration of the boom tip portion that cancels out the tilt due to the torsional moment acting on the boom side from the workbench is substantially perpendicular to the post member attached to the boom head member that is fitted and fixed to the boom tip. The boom head member may be attached to the boom so that its axis is at an angle as described above with respect to the vertical direction, or the post member itself is at an angle as described above. You may make it attach to. In any of the above mounting configurations, since the axis of the substantially vertical direction of the post member is inclined with respect to the vertical direction, when the workbench vibrates in the direction in which the torsional moment acting on the boom side increases from the workbench, The inclination of the work table accompanying this is suppressed small.

It is a figure which shows the aerial work vehicle which concerns on this invention, (a) is the top view, (b) shows the side view. It is a figure which shows the bending-extension arm and work bench | platform periphery provided in the said aerial work vehicle, (a) shows the side view, (b) shows the top view. It is a perspective view which shows the tip boom and the boom head inserted by the tip of this tip boom among the booms provided in the aerial work vehicle. It is a figure which shows the said boom head, (a) is the side view, (b) is BB sectional drawing in (a), (c) shows AA sectional drawing in (a). It is the schematic which shows the mode of the inclination of the working table accompanying the attachment structure with respect to the boom front-end | tip of the said bending / extending arm, and the neck vibration of a working table. It is the schematic which shows the work table periphery in the conventional aerial work vehicle, (a) And (b) shows the figure which shows the neck vibration of a work table, (c) shows the attachment structure to the vertical post of a work table. .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High-altitude work vehicle 2 Car body 5 Boom 5a Base end boom 5b Front end boom 6 Bending / extending arm 7 Work table 8 Vertical post (post member)
54 Leveling cylinder (leveling mechanism)
60 Boom head (boom head member)

Claims (4)

A boom mounted at least on a movable vehicle body, and a post member pivotably pivoted up and down at the tip of the boom; provided between the boom and the post member; A leveling mechanism that swings the post member up and down according to undulations and holds the post member in a state where the axis of the post member extends substantially vertically , and is mounted in a horizontal state and freely swingable around the axis of the post member An aerial work platform having a workbench
The axis of the post member is vertical so that the work table is in a substantially horizontal state in a state where the boom is twisted around the longitudinal axis in response to a torsional moment acting around the longitudinal axis of the boom from the work platform side. An aerial work vehicle characterized by tilting in a direction opposite to a direction in which the torsional moment acts around a longitudinal axis of the boom. The swing center of the workbench is configured to be located at a position offset in the width direction of the boom with respect to the axis in the longitudinal axis direction of the boom in plan view.
The axis of the post member is set so that the work table becomes substantially horizontal in a state in which a torsional moment caused by an offset is applied when the work table vibrates toward the swing center of the work table with respect to the boom. The aerial work vehicle according to claim 1, wherein is inclined with respect to a vertical direction. The boom has a boom head member attached to the tip,
3. The height according to claim 1, wherein the boom head member is attached to the boom such that an axis of the post member attached to the boom head member is inclined with respect to a vertical direction. Work vehicle. The boom has a boom head member attached to the tip,
The aerial work vehicle according to claim 1 or 2, wherein the post member is attached to the boom head member such that an axis of the post member is inclined with respect to a vertical direction.

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