JP2019156523A - Boarding device for high-place work vehicle - Google Patents

Abstract

To provide a boarding device for a high-place work vehicle, which is capable of developing a boarding step in a saved space.SOLUTION: The boarding device for a high-place work vehicle 1 is configured to develop an entire first step 100 by oscillating an upper step member 110 together with a lower step member 120 of a lower side stored attitude downward to change the upper step member 110 from an upper side stored attitude to an upper side developed attitude in a state where the first step 100 is stored on a vehicle body 2, and then oscillating the lower step member 120 downward with respect to the upper step member 110 to change the lower step member 120 from the lower side stored attitude to a lower side developed attitude.SELECTED DRAWING: Figure 13

Description

  The present invention relates to a boarding / alighting device for an aerial work vehicle having a boom on a vehicle body and a workbench attached to the tip of the boom.

  An aerial work vehicle is generally configured to have a work platform for boarding an operator at the tip of a telescopic boom provided on a vehicle body based on a truck vehicle so as to be able to move up and down, extend and retract and turn. Then, when an operator who has boarded the work table operates an operation device provided on the work table, the work table can be moved to a desired high position by operating the telescopic boom. It is widely used for electrical equipment construction and road construction.

  As such an aerial work vehicle, a rear storage type aerial work vehicle (for example, patented) in which a swivel base is provided in the front part on the vehicle body behind the driving cab and the work table is stored in a rear space on the vehicle body. Document 1) is known. In this aerial work vehicle, in order to satisfy the structural standards of the vehicle and expand the range where the work can be performed (that is, to ensure the maximum boom length within the standard size of the vehicle) It is stored while being swung to the side of the boom.

Japanese Utility Model Publication No. 5-12495

  In the aerial work vehicle described in the above-mentioned patent document, a boarding / alighting step is provided that serves as a foothold for the worker when getting on and off the work table on the left side of the vehicle body (the side on which the work table in the rear stowed position is located). The upper end portion of the getting-on / off step is pivotally connected to the vehicle body so as to be swingable (can be stored and deployed). At this time, in the above-described aerial work vehicle, the length of the getting-on / off step is extended to the side of the vehicle body when the getting-on / off step is unfolded from the folded state on the vehicle body to the outside of the vehicle body. Only a minute of development space is required. However, when parking an aerial work vehicle with the width shifted to the left of the road so as not to interfere with other traffic, there are often guard rails or side walls of buildings on the side of the road. In a narrow space, there is a problem that the boarding / alighting step cannot be developed unless a development space at least as long as the boarding / alighting step is secured on the side of the vehicle body.

  This invention is made | formed in view of such a subject, and it aims at providing the boarding / alighting apparatus of an aerial work vehicle which can expand | deploy the boarding / alighting step in space-saving.

In order to solve the above-mentioned problems, an alighting device for an aerial work vehicle according to the present invention includes a vehicle that has a driving cab at a front portion of a vehicle body and is capable of traveling, and a bodywork region behind the driving cab in the vehicle body. A swivel that is horizontally swiveled at the front, a boom that can be raised and lowered on the swivel, and a workbench that is swingably attached to the boom at the tip of the boom. In the aerial work vehicle configured such that the boom and the work table are stored in the bodywork area in a state where the boom is tilted backward and the work table is swung sideways. A boarding / alighting step used when getting on / off the workbench is provided on the side where the workbench in the stored state is located on the left or right side of the vehicle, and the boarding / alighting step is provided swingably with respect to the vehicle body. The upper step part and the upper A lower step portion provided swingably with respect to the step portion, and the upper step portion swings upward to be stored in the vehicle body and swings downward to The lower step portion swings in a direction close to the upper step portion and is stored in the upper step portion. 2 is configured such that the posture can be changed between a retracted posture and a second deployed posture that swings in a direction away from the upper step portion and projects outward from the upper step portion. In the state of being stored in the upper position, the upper step portion is swung downward together with the lower step portion in the second storage posture to change the posture of the upper step portion from the first storage posture to the first deployed posture. After the lower step part The entire step of getting on and off is developed by swinging downward with respect to the upper step portion and changing the posture of the lower step portion from the second retracted posture to the second deployed posture. It is characterized by that.

  In the above described aerial work vehicle boarding / alighting device, the upper step portion is configured to swing up and down around a pivot shaft provided on the vehicle body, and the lower step portion is the upper step. It is preferable that the upper step portion and the lower step portion are configured to overlap each other in the circumferential direction of the pivot shaft when in the second retracted position with respect to the portion.

  Further, the boarding / alighting device for an aerial work vehicle having the above-described configuration includes a parallel link mechanism that connects the upper step portion and the lower step portion in parallel, and the lower step portion is connected to the upper step portion with the parallel link It is configured to be swingable by a mechanism, and when the entire getting-on / off step is in a developed state, the tread surface of the lower step portion is arranged at a position offset outward in the vehicle width direction with respect to the upper step portion. It is preferable.

  Further, in the boarding / alighting device for an aerial work vehicle having the above-described configuration, the boarding / alighting step in a state where the whole boarding / alighting step is deployed outward from the vehicle body and a state where the whole boarding / alighting step is stored on the body. The tread surface is arranged upward in a state where the entire getting-on / off step is deployed outward of the vehicle body, and the whole getting-on / off step is stored on the vehicle body. In a state, it is preferable that a tread different from the tread is arranged upward.

  According to the boarding / alighting apparatus for an aerial work vehicle according to the present invention, the boarding / alighting step is configured to swing and deploy in two stages toward the outside of the vehicle. Even if no corresponding empty space (development space) is left, the upper step part and the lower step part can be swung one by one in order, and the getting-on / off step can be developed in a space-saving manner. As a result, it is possible to safely get on and off the work table from the ground without obstructing the flow of traffic.

  Further, in the aerial work platform getting-on / off device having the above-described configuration, the upper step portion and the lower step portion are swung around the swing shaft in the first unfolding operation in the two-step unfolding operation. As a result, the swing radius (deployment radius) of the upper step portion and the lower step portion can be minimized.

  Furthermore, in the aerial work vehicle boarding / alighting device having the above-described configuration, when the entire boarding / unloading step is in the deployed state (maximum deployed state), the tread of the lower step part is outward in the vehicle width direction with respect to the upper step part Since it is positioned at an offset position, it is easy to see the tread from above the vehicle body, and it becomes a target when getting off the ground from the top of the vehicle body. This makes it possible to further improve the safety of work when getting on and off.

  In addition, in the aerial work vehicle boarding / alighting device having the above-described configuration, even when the deployment space for the boarding / alighting step cannot be secured because the vehicle is moved all the way to the left side of the road (a situation where the boarding / alighting step cannot be developed) However, because this step is a dedicated tread for the retracted state, if there is enough space for one worker to enter the side of the vehicle, the worker must step on the tread. It is possible to get on and off the work table. Therefore, the method of using the boarding / alighting step can be changed according to the width-shifting state of the vehicle, and it is possible to provide a boarding / alighting step that is very convenient for the operator.

It is a perspective view of the aerial work vehicle provided with the boarding / alighting device concerning this embodiment. It is a side view of the aerial work vehicle. It is a top view of the aerial work vehicle. It is a rear view of the said high place worker. It is a block diagram which shows the action | operation mechanism in the said aerial work vehicle. It is a perspective view of the 1st step (boarding / alighting step) with which the aerial work vehicle was equipped. It is a front view of the said 1st step. It is a side view of the said 1st step. It is a perspective view of the state where the sub step member of the 1st step projected below to the main step member. It is a perspective view in the state where the sub step member of the first step protrudes substantially horizontally with respect to the main step member. It is a perspective view which shows the storing state of the said 1st step. It is a perspective view which shows the middle development state of the said 1st step. It is a perspective view which shows the maximum expansion | deployment state of the said 1st step.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The aerial work vehicle 1 provided with the boarding / alighting device according to the present embodiment is shown in FIGS. 1 to 4. First, the overall configuration of the aerial work vehicle 1 will be described with reference to these drawings. In the following, for convenience of explanation, the arrow directions added to FIG. 1 are defined as front and rear, left and right, and up and down.

  The aerial work vehicle 1 has a driving cab 7 at the front portion of the vehicle body 2 and is configured based on a track type vehicle that can travel with a pair of left and right front wheels 5f and a rear wheel 5r arranged at the front and rear of the vehicle body 2. Yes. The vehicle body 2 includes a vehicle body frame including a chassis frame 3 on which front wheels 5f and a rear wheel 5r are disposed, and a sub frame 4 attached on the chassis frame 3.

  Jack devices 10 that lift and support the vehicle body 2 are provided on the front, rear, left and right of the subframe 4. The jack device 10 includes a pair of left and right front jacks 10f disposed behind the front wheels 5f and a pair of left and right rear jacks 10r disposed behind the rear wheels 5r. Each of the jacks 10f and 10r drives the jack cylinder 11 (see FIG. 5) provided therein to extend downward to support the vehicle body 2 so that the entire vehicle is stabilized. . The vehicle body 2 is provided with a jack operating device 15 (see FIG. 5) for operating the jacks 10f and 10r.

The front part of the subframe 4 (the front part of the body region behind the driving cab 7 in the vehicle body 2) is driven by a turning motor 24 (see FIG. 5) so as to be able to turn horizontally around the vertical axis. A swivel base 20 is provided. The swivel base 20 is disposed at a substantially central portion in the left-right direction on the subframe 4. A base end portion of the boom 30 is attached to the upper portion of the swivel base 20 via a foot pin 21 so as to be swingable (can be raised and lowered) in the vertical direction. In addition, left and right tool boxes 26L and 26R for storing work tools, work base materials, and the like are provided on the left and right sides of the subframe 4.

  The boom 30 has a structure in which a proximal boom 30a, an intermediate boom 30b, and a distal boom 30c are assembled in order from the swivel base 20, and a telescopic cylinder 31 (see FIG. 5) provided therein. The boom 30 can be expanded and contracted in the axial direction by the expansion and contraction drive of (see). Further, a hoisting cylinder 23 is straddled between the base end boom 30a and the swivel base 20, and the hoisting cylinder 23 is caused to move up and down within the upper and lower surfaces (vertical surfaces) by driving the hoisting cylinder 23 to extend and contract. Can be made.

  A vertical post (not shown) is pivotally supported at the tip of the tip boom 30c so as to be swingable in the vertical direction. The vertical post is controlled to swing by a leveling device (not shown) disposed between the front boom 30c and the vertical post is always held in a vertical posture regardless of whether the boom 30 is raised or lowered. It is the composition which becomes. In addition, a work table 40 for boarding an operator is attached to the vertical post via a work table bracket (not shown). A swing motor 41 (see FIG. 5) is provided inside the workbench bracket. By driving the swing motor 41, the workbench 40 is swung around the vertical post (horizontal swivel). Move). Here, since the vertical post is always kept in the vertical posture as described above, as a result, the floor surface of the work table 40 is always kept horizontal regardless of the undulation angle of the boom 30.

  The work table 40 is provided with a work operation device (upper operation device) 45 provided with operation means such as an operation lever, an operation switch, and an operation dial operated by an operator who has boarded the work table. Therefore, an operator who has boarded the work table 40 operates the work operation device 45 to turn the swivel base 20 (rotation action of the turn motor 24) and raise / lower the boom 30 (extension / contraction action of the hoisting cylinder 23). The operation of the boom 30 can be performed such as the telescopic operation of the boom 30 (the telescopic operation of the telescopic cylinder 31) and the swing operation of the work table 40 (the rotational operation of the swing motor 41). Although not shown, the vehicle body 2 is also provided with a work operation device (lower operation device) so that an operator on the ground or on the vehicle body 2 can perform the above operation.

  As shown in FIG. 5, the operation mechanism of the jack device 10 and the high place work device (the above-described swivel base 20, boom 30, work stand 40, etc.) provided in the vehicle body 2 is a jack operation device 15 and a work operation device 45. For operating the controller 50 to which the operation signal is input, the jack cylinder 11, the swing motor 24, the hoisting cylinder 23, the telescopic cylinder 31, and the swing motor 41 (hereinafter collectively referred to as "hydraulic actuator 55"). A hydraulic unit 60 that supplies hydraulic oil, a work battery 70 that stores DC power, and an inverter 71 that converts DC power from the work battery 70 into AC power and supplies the AC power to the hydraulic unit 60 are configured. ing.

The hydraulic unit 60 includes a pump drive motor 61 that is driven by receiving electric power (AC power) supplied from the work battery 70 via the inverter 71, and a hydraulic pump that is driven by the pump drive motor 61 to discharge hydraulic oil. 62, a control valve 63 provided corresponding to each of the hydraulic actuators 55, and an oil tank T that stores hydraulic oil. The hydraulic oil stored in the oil tank T is sucked up by the hydraulic pump 62 and supplied to the control valve 63. The control valve 63 supplies hydraulic oil supplied from the hydraulic pump 62 to each hydraulic actuator 55 in accordance with a control signal from the controller 50 (control signal according to operation signals from the jack operation device 15 and the work operation device 45). The direction and supply amount are controlled, and the operation direction and operation speed of each hydraulic actuator 55 are controlled (jack device 10).
And control the working direction and speed of the aerial work equipment).

  In the aerial work vehicle 1 configured as described above, as shown in FIGS. 1 to 4, the boom 30 is contracted to the fully contracted state and is tilted backward. By swinging to the left side, the boom 30 and the work table 40 are stored on the body region behind the driving cab 7 in the vehicle body 2 (rear storing posture). When the boom 30 and the workbench 40 are in the retracted state (rear retracted posture), the tip of the boom 30 is positioned at the rear right corner on the vehicle body 2, and the work is swung to the left from the tip of the boom 30. The base 40 is located on the left side of the rear part of the vehicle body 2.

  The aerial work vehicle 1 having such a configuration is provided with an getting-on / off route 80 for an operator to get on and off between the work table 40 in the retracted state and the ground. This boarding / alighting path 80 is configured as a so-called side boarding type boarding / alighting path in which an operator gets onto the vehicle body 2 from the side (left side) of the vehicle.

  The getting-on / off route 80 includes a swing-deployed first step 100 provided in the vicinity of the rear wheel 5r on the left side of the vehicle body 2, and a step-like first step provided adjacent to the right of the first step 100. 2 steps 200, a third step 300 provided adjacent to the front of the second step 200 and also used as the left tool box 26, and provided adjacent to the right of the third step 300 A step-like fourth step 400 is provided. Each of the steps 100 to 400 is formed as a tread surface whose upper surface serves as a scaffold for the operator. And these 1st-4th steps 100-400 are formed in the four-step type step shape which becomes high in steps toward the 4th step 400 from the 1st step 100. As shown in FIG.

  Here, as a general parking state of the aerial work vehicle 1, the vehicle is parked in a state of being widened to the left side of the road so as not to disturb the flow of other traffic. However, there are many obstacles such as guardrails and side walls of buildings on the side of the road, and in the case of adopting a specification (so-called side boarding) that rides on the vehicle body 2 from the side of the vehicle, This technique has a problem that the step cannot be extended to the side unless there is a development space (oscillation space) at least as long as the length of the step on the side of the vehicle. Therefore, in the present embodiment, the first step 100 for side entry employs a two-stage deployment method in order to minimize the deployment radius (oscillation radius).

  Now, the structure of the first step 100 of the present embodiment will be described below with reference to FIGS. The first step 100 includes an upper step member 110 and a lower step member 120 that form the main body of the first step 100, and a parallel link mechanism 130 that supports the upper step member 110 and the lower step member 120 in a relatively swingable manner. It is configured with. The first step 100 is configured to be housed (can be stored) in an opening 201 opened to the left side of the second step 200.

  The upper step member 110 includes an upper frame main body 111 that is bent in a substantially U shape, a base plate 112 having an L-shaped cross section that is laid between both ends of the upper frame main body 111, and a central portion of the upper frame main body 111. And a support plate 113 having an L-shaped cross section joined thereto.

The upper frame main body 111 is formed by bending one tube material into a U shape, and includes a pair of vertical frame portions 111a and a horizontal frame portion 111b that connects the pair of vertical frame portions 111a. Has been. A pair of upper coupling plates 114 coupled to the parallel link mechanism 130 are joined to each vertical frame portion 111a. On the surface of the support plate 113 (upper surface in FIG. 10), a pair of receiving members 115 that are in contact with and received by a tread 122 of a lower step member 120 described later are attached. The receiving member 115 is formed in a substantially rectangular parallelepiped shape using, for example, a synthetic resin material, and is fastened by a plurality of bolts in a joint surface with the horizontal frame portion 111b in the support plate 113. Also, a shock absorbing (shock absorbing) rubber member 116 that is in contact with the left rear wheel 5r when the first step 100 is deployed is attached to the support plate 113.

  The base plate 112 includes a horizontally long substrate portion 112a straddling between a pair of vertical frame portions 111a, and a horizontally long auxiliary plate portion 112b that is bent substantially vertically from an end portion of the substrate portion 112a. . A pair of inner hinges 117 connected to a pair of outer hinges 202 provided at the lower end of the second step 200 are fastened to the board portion 112a by a plurality of bolts. An upper step member 110 is attached so as to be swingable in the vertical direction. Here, the upper step member 110 has an upper storage posture in which the distal end side (support plate 113 side) swings upward about the hinge axis and is stored in the opening 201 of the second step 200, and the upper step side ( The support plate 113 side) swings downward about the hinge axis, and the posture can be changed between the upper deployed posture protruding outward from the opening 201 of the second step 200. In addition, between the pair of inner hinges 117 in the base plate 112, a locking tool 118 that is detachably engaged with a locked tool (not shown) provided on the lower step member 120 is attached. .

  The lower step member 120 includes a lower frame body 121 that is bent and formed in a substantially U shape, and a tread plate 122 that is installed between both ends of the lower frame body 121. The lower step member 120 is formed to have substantially the same size (vertical and horizontal dimensions) as the upper step member 110.

  The lower frame body 121 is formed by bending a single pipe material into a U shape, and includes a pair of vertical frame portions 121a and a horizontal frame portion 121b that connects the pair of vertical frame portions 121a. Has been. A pair of lower connection plates 123 connected to the parallel link mechanism 130 are joined to each vertical frame portion 121a. A rectangular annular first gripping portion 124 that is held by a worker with fingers when the first step 100 is expanded or stored is joined to the horizontal frame portion 121b. The first grip portion 124 includes a fixed side half 124a joined to the horizontal frame portion 121b, and a movable side half 124b fixed to the fixed side half 124a with a pair of bolts and nuts. By loosening the nut, the tilting posture of the movable half body 124b with respect to the fixed half body 124a can be adjusted.

  The tread board 122 is formed in a curved plate shape bent in a substantially L-shaped cross section, and is joined to the distal end portion of each vertical frame portion 121a. On one end surface of the tread plate 122 (upper surface in FIG. 9), a tread surface S1 is formed which serves as a foothold when an operator gets on and off in the first boarding / alighting method described later. The upper step member 110 is provided with treads S2 and S3 that serve as scaffolds for the worker to get on and off in the second way of getting on and off described below. Further, the tread 122 is formed with a rectangular annular second gripping portion 125 that the operator grips with fingers when the first step 100 is expanded or stored. The second grip 125 is formed so as to protrude into the U-shaped opening of the lower frame main body 121.

The parallel link mechanism 130 includes a pair of link members 131 and 132 that are formed to have substantially the same length and are arranged in parallel to each other. Each of the link members 131 and 132 is installed between the upper connection plate 114 of the upper step member 110 and the lower connection plate 123 of the lower step member 120. The first link member 131 has one end pivoted to the inner surface of the upper connecting plate 114 of the upper step member 110 and the other end pivoted to the inner surface of the lower connecting plate 123 of the lower step member 120. The second link member 132 has one end pivoted to the outer surface of the upper connecting plate 114 of the upper step member 110 and the other end pivoted to the outer surface of the lower connecting plate 123 of the lower step member 120. The pivot shafts P1, P2, P3, and P4 of the link members 131 and 132 are substantially quadrangular (substantially parallelogram or substantially rectangular) formed between the link members 131 and 132 and the connecting plates 114 and 123. It is arranged at the vertex position. Here, the length of each link member 131,132 is formed in the length of the half of the vertical dimension of each step member 110,120. Further, as shown in FIG. 10, the upper step member 110 and the lower step member 120 are arranged in the vertical direction of the step members 110 and 120 (the vertical direction in FIG. 10) in a state where the link members 131 and 132 extend substantially horizontally. ) Are offset by the length of approximately half the vertical dimension of each step member 110, 120 (the length of each link member 131, 132).

  Here, the lower step member 120 is swingable up and down around the hinge axis integrally with the upper step member 110, and the upper step member by the parallel link mechanism 130 configured by the pair of link members 131 and 132. 110 is configured to be relatively swingable while maintaining a parallel positional relationship with respect to 110. At this time, the lower step member 120 swings in a direction close to the upper step member 110 as a relative swing position with respect to the upper step member 110, and is stored in the upper step member 110 (the upper step member 110 and the hinge shaft are rotated). The posture can be changed between a lower storage posture that overlaps the upper step member 110 and a lower deployed posture that swings away from the upper step member 110 and projects outward. Specifically, when the upper step member 110 is in the upper deployed position, the lower step member 120 is swung upward so that the lower step member 120 overlaps with the upper step member 110 and is stored in the lower side. Displaces to the retracted position. On the other hand, when the upper step member 110 is in the upper deployed position, the lower step member 120 is displaced downward, and the lower step member 120 is displaced to the lower deployed position that projects downward from the upper step member 110.

  Next, as a characteristic action of the boarding / alighting device for the aerial work vehicle 1 according to the present embodiment, the flow of work until the worker gets on the work table 40 through the boarding route 80 will be described with reference to FIGS. This will be described with additional reference.

  First, the worker who arrives at the work site parks the aerial work vehicle 1 close to the left side of the road so as not to obstruct other traffic. Next, a color cone (registered trademark) or the like is installed around the vehicle to ensure traffic safety, and then the jacks 10f and 10r are projected and grounded to stably hold the vehicle body 2. Subsequently, in order to perform a desired work at a high place, the worker gets on the work table 40 from the ground through the getting-on / off route 80 (first to fourth steps 100 to 400) on the vehicle body 2, At this time, the first step 100 (the upper step member 110 and the lower step member 120) is folded and stored in the opening 201 of the second step 200 as shown in FIG. It is). The storage state of the first step 100 is a state in which the upper step member 110 is in the upper storage posture and the lower step member 120 is in the lower storage posture. Therefore, the worker who is on the ground moves to the vicinity of the first step 100 before getting on the vehicle body 2 and performs a deployment operation for projecting the first step 100 to the side of the vehicle.

  In the deployment operation of the first step 100, the upper step member 110 and the lower step member 120 are deployed in two stages. As shown in FIG. 6, when the first step 100 is in the retracted state, the locking projection 119 provided on the first step 100 (upper step member 110) side is provided on the second step 200 side. By being locked by the lock mechanism 203, the first step 100 is held in a state of being fixed in the opening 201 of the second step 200.

First, as an unfolding operation in the first stage, the operator releases the locking of the first step 100 by the lock mechanism 203 and then moves the entire first step 100 downward about the hinge axis as shown in FIG. And the upper step member 110 and the lower step member 120 are displaced to a state where the upper step member 110 and the lower step member 120 protrude downward from the opening 201 of the second step 200 (referred to as a “halfway unfolded state”). The intermediate development state of the first step 100 is a state where the upper step member 110 is in the upper deployment posture and the lower step member 120 is in the lower storage posture. In the first-stage deployment operation, the upper step member 110 and the lower step member 120 swing downward while overlapping each other around the hinge axis (the circumferential direction of the hinge axis). Therefore, the swing radius (deployment radius) of the upper step member 110 and the lower step member 120 is set to a swing radius corresponding to the length of each of the step members 110 and 120 (about half of the entire length of the first step 100). Oscillating radius). When the upper step member 110 and the lower step member 120 are swung downward in this way, the rubber member 116 disposed on the back side of the upper step member 110 first contacts the side surface of the rear wheel 5r. The impact at the time of descent can be absorbed, and the load applied when the operator gets on and off after that can be reduced. In addition, when the first step 100 is in the halfway unfolded state in this way, the opening 201 of the second step 200 is opened to the left, so that the lower tread 204 of the second step 200 is exposed and the upper step 200 is exposed to the upper side. It becomes available to the operator together with the tread surface 205.

  Subsequently, as shown in FIG. 13, the operator swings the lower step member 120 downward with respect to the upper step member 110 as the second stage of expansion work, and moves the lower step member 120 to the upper step member. It is displaced to a state of projecting downward from 110 (referred to as “maximum unfolded state”). The maximum deployment state of the first step is a state where the upper step member 110 is in the upper deployment posture and the lower step member 120 is in the lower deployment posture. When the first step 100 is in the maximum unfolded state, a tread surface S1 is formed on the upper surface of the tread 122 of the lower step member 120 to serve as a scaffold when the operator gets on and off. In this second stage of deployment work, the lower step member 120 does not jump out to the side of the vehicle (outward to the left) beyond the rocking radius in the first stage of deployment work. Therefore, in the unfolding operation of the first step 100, the first step 100 can be extended to the maximum unfolded state as long as there is a space on the side of the vehicle according to the first stage swing radius.

  Next, after setting the first step 100 to the maximum unfolded state, the worker gets on the tread surface S1 of the first step 100 and gets on the second step 200. Then, the worker travels on the getting-on / off route 80 in the order of the third step 300 and the fourth step 400 and finally gets on the work table 40.

  The aerial work vehicle 1 of the present embodiment has two ways of getting on and off from the ground to the work table 40. As described above, the first getting-on / off method is a method of getting on / off using the first step 100 to the fourth step 400 in a state where the first step 100 is developed (the auxiliary step 500 shown in FIGS. 1 and 2). To get on and off without using). On the other hand, the second boarding / alighting method is a method of boarding / alighting using the auxiliary step 500 in addition to the first step 100 to the fourth step 400 with the first step 100 stored. This second boarding / exiting method will be described below.

In this second boarding / alighting method, the first step 100 (the upper step member 110 and the lower step member 120) is used in a state where it is folded and stored in the opening 210 of the second step 200 (stored state). . As described above, the storage state of the first step 100 is a state in which the upper step member 110 is in the upper storage posture and the lower step member 120 is in the lower storage posture. In this second boarding / alighting method, an operator on the ground first places his / her foot on the auxiliary step 500 from the left side of the vehicle, and then moves to the first step 100 in the stowed state located obliquely above. When the first step 100 is in the retracted state, the base plate 112 is provided with a tread surface S2 serving as a lower-stage scaffold when the operator gets on and off, and the operator gets on and off the support plate 113. The tread surface S3 serving as a scaffold on the upper stage is arranged facing upward. Therefore, when moving from the auxiliary step 500 to the first step 100, the worker can get on the vehicle body 2 with his / her feet on the upper and lower treads S2, S3 of the first step 100. At this time, it is desirable to adjust the second grip portion 124 of the lower step member 120 to a horizontal posture tilted inward of the vehicle so as not to hinder the entry into the upper tread surface S3 (FIG. 6, (See FIG. 11 etc.) Then, the worker travels on the getting-on / off route 80 in the order of the third step 300 and the fourth step 400 and finally gets on the work table 40.

  As described above, according to the aerial work vehicle 1 according to the present embodiment, the first step 100 is configured to swing and deploy in two stages toward the outside of the vehicle. Even if there is no empty space (development space) corresponding to the length, the upper step member 110 and the lower step member 120 are swung one by one in order to develop the first step 100 in a space-saving manner. Therefore, the vehicle can be as close as possible to the end of the road, and as a result, it is possible to safely get on and off the work table 40 from the ground without obstructing the flow of traffic.

  Further, in the aerial work vehicle 1 according to the present embodiment, the upper step member 110 and the lower step member 120 are swung around the hinge axis so as to overlap each other in the first unfolding operation among the two-stage unfolding operations. Thus, the swing radius (deployment radius) of the upper step member 110 and the lower step member 120 can be minimized.

  Further, in the aerial work vehicle according to the present embodiment, when the first step 100 is in the maximum unfolded state, the tread surface S1 of the lower step member 120 is on the left side with respect to the upper step member 110 (outward in the vehicle width direction). Since the tread surface S1 is easily visible from the upper side of the vehicle body 2 and is a target when getting off the vehicle body 2 from the top of the vehicle body 2, when the operator drops his feet to the first step 100 Further, there is no fear of stepping off from the tread surface S1, and it becomes possible to further improve the safety of work when getting on and off.

  Further, in the aerial work vehicle 1 according to the present embodiment, even when the deployment space of the first step 100 cannot be secured because the vehicle is moved all the way to the left side of the road (the first step 100 is deployed). In this first step 100, since the treads S2 and S3 dedicated to the storage state are installed in this first step 100, there is only a space where one worker can enter the side of the vehicle. The worker can get on and off the work table 40 with his / her feet on the treads S2 and S3. Therefore, the usage method of the first step 100 can be changed according to the width-shifting state of the vehicle, and it is possible to provide a boarding / exiting step that is very convenient for the operator.

  In addition, the aerial work vehicle 1 according to the present embodiment is provided with steps 600 and 700 dedicated to rearward riding in addition to the steps 100 and 500 dedicated to lateral loading (the other steps 200 to 400 are shared). Type) As a method of getting on and off the work table 40 from the ground, the operator can select one of the boarding method and the boarding method of the rear boarding and the side boarding according to the parking state of the vehicle.

  In addition, in the aerial work vehicle 1 of this embodiment, as shown in FIG. 5, the structure provided with the storage detector 140 which detects the storage state of the 1st step 100 may be employ | adopted. As an example of the storage detector 140, a limit switch having a movable contact formed in a roller shape is preferable. When the first step 100 is in the unstored state, the storage detector 140 is turned off toward the controller 50 because the contact switch swings outward due to the elastic force of the built-in spring. A signal (unstored detection signal) is output. On the other hand, when the first step 100 is in the retracted state, the storage detector 140 is detected when the contact is pushed inward by the upper step member 110 or the lower step member 120 against the elastic force of the built-in spring. Then, an ON signal (stored detection signal) is output to the controller 50.

Moreover, in the aerial work vehicle 1 of this embodiment, the structure provided with the storage display apparatus (storage notification means) 150 which alert | reports whether the 1st step 100 exists in the storage state in the driving cab 7 is employ | adopted. Also good. The storage display device 150 is constituted by, for example, an LED lamp or a liquid crystal display. When the controller 50 receives an ON signal (storage detection signal) from the storage detector 140, the controller 50 displays on the storage display device 150 provided in the operation cab 7 that the first step 100 is in the storage state. On the other hand, when the controller 50 receives an off signal (non-storage detection signal) from the storage detector 140, the controller 50 displays on the storage display device 150 provided in the driving cab 7 that the first step 100 is in the non-storage state. . As a result, the operator confirms the display content of the storage display device 150 before starting the operation of the aerial work vehicle 1 at the end of the work, so that the first step 100 is not stored. Thus, it is possible to prevent a situation in which the aerial work vehicle 1 is accidentally caused to travel in the state of overhanging. As the storage notification means, an alarm device such as an alarm buzzer or an alarm lamp may be applied instead of the storage display device 150.

  In addition, this invention is not limited to the said embodiment, If it is a range which does not deviate from the summary of this invention, it can improve suitably.

  For example, in the above-described embodiment, the telescopic boom type aerial work vehicle is exemplified and described as the aerial work vehicle according to the present invention. However, the present invention is not limited to this. The present invention can be applied to any high-altitude work vehicle that employs a configuration in which a boom is held in a rear retracted posture on a vehicle body. Further, in the above-described embodiment, an electric drive type (battery drive type) aerial work vehicle has been described as an example. However, the present invention is not limited to this, and engine power is supplied by a PTO mechanism (power take-off mechanism). It may be a PTO-driven aerial work vehicle that takes out and drives a hydraulic pump, or a hybrid aerial work vehicle that includes both of them and selectively switches the power source.

DESCRIPTION OF SYMBOLS 1 High aerial work vehicle 2 Car body 7 Driving cab 20 Swivel platform 30 Boom 40 Work platform 45 Work operation device 80 Boarding / alighting path 100 1st step (boarding step)
110 Upper step member (upper step part)
120 Lower step member (lower step part)
130 Parallel link mechanism 131 First link member 132 Second link member 202 Outer hinge (pivoting shaft)
S1 Tread S2 Tread S3 Tread

Claims (4)

A vehicle capable of traveling with a driving cab at the front of the vehicle body, a swivel provided horizontally at the front of the bodywork area behind the driving cab on the vehicle body, and a swingable on the swivel A boom attached to the boom, and a workbench attached to the tip of the boom so as to be swingable with respect to the boom, and the boom is tilted backward to swing the workbench laterally. In an aerial work platform configured to store the boom and the workbench in the bodywork area in a state,
On the side where the stored work table is located between the left and right sides of the vehicle body, a boarding / unloading step used when getting on / off the work table is provided,
The getting-on / off step includes an upper step portion provided swingably with respect to the vehicle body, and a lower step portion provided swingably with respect to the upper step portion,
The upper step portion can change posture between a first retracted posture swinging upward and stored in the vehicle body, and a first deployed posture swinging downward and projecting outward of the vehicle body. Configured,
The lower step portion swings in a direction approaching the upper step portion and stored in the upper step portion, and swings in a direction away from the upper step portion and swings in the upper step portion. The posture can be changed between the second deployed posture protruding outward from the
In a state where the entire getting-on / off step is stored on the vehicle body, the upper step portion is swung downward together with the lower step portion in the second storage posture to move the upper step portion from the first storage posture. After changing the posture to the first deployed posture, swinging the lower step portion downward with respect to the upper step portion to change the posture of the lower step portion from the second retracted posture to the second deployed posture. And a boarding / alighting device for an aerial work vehicle, characterized in that the whole boarding / alighting step is in an unfolded state. The upper step part is configured to swing up and down around a pivot shaft provided on the vehicle body,
When the lower step portion is in the second retracted position with respect to the upper step portion, the upper step portion and the lower step portion are configured to overlap in the circumferential direction of the pivot shaft. The aerial work vehicle getting on and off device according to claim 1. A parallel link mechanism for connecting the upper step part and the lower step part in parallel;
The lower step part is configured to be swingable with respect to the upper step part by the parallel link mechanism,
The stepping surface of the lower step part is disposed at a position offset outward in the vehicle width direction with respect to the upper step part when the entire getting-on / off step is in an unfolded state. 2. A boarding / alighting device for an aerial work vehicle according to 2. The state where the entire getting on / off step is deployed outward of the vehicle body and the state where the entire getting on / off step is stored on the vehicle body are configured such that the up / down steps of the getting on / off step are reversed,
In the state where the entire boarding / alighting step is deployed outward of the vehicle body, the tread is disposed upward,
4. The high place according to claim 1, wherein a tread surface different from the tread surface is arranged upward in a state where the entire getting-on / off step is stored on the vehicle body. 5. Work vehicle entry / exit device.

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