JP7036631B2 - Boarding / alighting device for aerial work platforms - Google Patents

Description

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

Aerial work platforms are generally configured with a workbench for worker boarding at the tip of a telescopic boom provided on a vehicle body based on a truck vehicle that can be undulated, stretched and swiveled. Then, by operating the operation device provided on the workbench, the worker on the workbench can operate the telescopic boom to move the workbench to a desired high position and perform the work. It is widely used for electrical equipment construction and road construction.

As such an aerial work platform, a rear retractable aerial work platform (for example, a patent) in which a swivel is provided in the front part on the vehicle body behind the driving cab and the workbench is stored in the rear space on the vehicle body. (See Document 1) is known. In this aerial work platform, the workbench is placed on the vehicle body in order to expand the workable range while satisfying the structural standards of the vehicle (that is, to secure the maximum boom length within the standard dimensions of the vehicle). It is designed to be stored in a state of swinging to the side of the boom.

Jitsukaihei 5-1249 Gazette

In the aerial work platform described in the above patent document, a step for getting on and off is provided on the left side of the vehicle body (the side where the workbench in the rear retracted posture is located), which serves as a scaffolding for workers when getting on and off the workbench. The upper end of the boarding / alighting step is pivotally connected to the vehicle body and is configured to be swingable (retractable and deployable). At this time, in the above-mentioned aerial work platform, when the boarding / alighting step is expanded from the retracted state folded on the car body to the outside of the car body when boarding the workbench, the length of the boarding / alighting step is on the side of the car body. Only minutes of deployment space is required. However, when aerial work platforms are parked on the left side of the road so as not to interfere with other traffic, there are often guardrails, side walls of buildings, etc. on the side of the road. There is a problem that the boarding / alighting step cannot be deployed unless a deployment space for at least the length of the boarding / alighting step is secured on the side of the vehicle body in such a narrow place.

The present invention has been made in view of such problems, and an object of the present invention is to provide an aerial work platform boarding / alighting device capable of deploying boarding / alighting steps in a space-saving manner.

In order to solve the above problems, the boarding / alighting device for a high-altitude work vehicle according to the present invention includes a vehicle capable of traveling with a driving cab at the front portion of the vehicle body and a mounting region behind the driving cab in the vehicle body. It is equipped with a swivel table that can be swiveled horizontally at the front, a boom that is undulatingly attached to the swivel table, and a work table that is swung freely with respect to the boom at the tip of the boom. In a high-altitude work vehicle configured so that the boom and the workbench are stored in the mounting area in a state where the boom is tilted backward and the workbench is swung sideways, the vehicle body is used. A boarding / alighting step used for getting on / off the workbench is provided on the side of the left and right sides where the workbench in the retracted state is located, and the boarding / alighting step is provided so as to be swingable with respect to the vehicle body. The upper step portion is provided with a lower step portion that is swingably provided with respect to the upper step portion, and the upper step portion has a first storage posture that swings upward and is stored in the vehicle body. The lower step portion is configured so that the posture can be changed between the first deployed posture that swings downward and projects outward from the vehicle body, and the lower step portion is the state in which the upper step portion is in the first deployed posture. A second storage posture that swings in a direction close to the upper step portion and is stored so as to overlap in parallel with the upper step portion, and the upper step portion in a state where the upper step portion is in the first deployment posture. The upper position is configured so that the posture can be changed between the second deployment posture that swings in the direction of separation and projects outward from the upper step portion, and the entire boarding / alighting step is stored on the vehicle body. The step portion is swung downward together with the lower step portion in the second retracted posture to change the posture of the upper step portion from the first retracted posture to the first deployed posture, and then the lower step portion is moved to the said lower step portion. 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, the entire boarding / alighting step is configured to be in a deployed state. It is characterized by that.

In the aerial work platform boarding / alighting device having the above configuration, the upper step portion is configured to swing up and down about a pivot shaft provided on the vehicle body, and the lower step portion is the upper step. When in the second storage posture with respect to the portion, 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 axis.

Further, in the boarding / alighting device of the aerial work platform having the above configuration, a parallel link mechanism for connecting the upper step portion and the lower step portion in parallel is provided, and the lower step portion is the parallel link to the upper step portion. It is configured to be swingable by a mechanism, and when the entire boarding / alighting step is in the expanded 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. Is preferable.

Further, in the aerial work platform boarding / alighting device having the above configuration, the boarding / alighting step is a state in which the entire boarding / alighting step is deployed outside the vehicle body and a state in which the entire boarding / alighting step is stored on the vehicle body. The treads are arranged upward in a state where the entire boarding / alighting step is deployed outward of the vehicle body, and the entire boarding / alighting step is stored on the vehicle body. It is preferable that the tread surface different from the tread surface is arranged upward in the above-mentioned state.

According to the aerial work platform boarding / alighting device according to the present invention, the boarding / alighting step is configured to swing and deploy in two stages toward the outside of the vehicle, so that the length of the entire step is set to the side of the vehicle. Even if there is no corresponding empty space (deployment space) left, the upper step portion and the lower step portion can be swung step by step in order to expand the boarding / alighting step in a space-saving manner. Can be moved as close as possible to the edge of the road, and as a result, it is possible to safely get on and off the work platform from the ground without obstructing the flow of traffic.

Further, in the aerial work platform boarding / alighting device having the above configuration, the upper step portion and the lower step portion are swung around the swing axis in a state of being overlapped with each other in the first unfolding work of the two-step unfolding work. This makes it possible to minimize the swing radius (deployment radius) of the upper step portion and the lower step portion.

Further, in the boarding / alighting device of the aerial work platform having the above configuration, when the entire boarding / alighting step is in the deployed state (maximum deployed state), the tread of the lower step portion is outward in the vehicle width direction with respect to the upper step portion. By arranging it in an offset position, it is easy to see the tread from above the vehicle body, and it becomes a target when descending from the vehicle body to the ground. It is possible to further improve the safety of work when getting on and off without the possibility of stepping off.

Further, in the boarding / alighting device of the aerial work platform having the above configuration, even if the space for deploying the boarding / alighting step cannot be secured due to the width of the vehicle being moved to the left side of the road (the situation where the boarding / alighting step cannot be deployed). However, since this step for getting on and off has a tread dedicated to the retracted state, if there is enough space on the side of the vehicle for one worker to enter, the worker can put his foot on the tread. It is possible to get on and off the workbench. Therefore, it is possible to change the method of using the boarding / alighting step according to the width 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 platform provided with the boarding / alighting device which concerns on this embodiment. It is a side view of the said aerial work platform. It is a top view of the aerial work platform. It is a rear view of the said high-altitude worker. It is a block diagram which shows the operation mechanism in the said aerial work platform. It is a perspective view of the 1st step (boarding / alighting step) provided in the said aerial work platform. 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 in which the sub-step member of the first step is projected downward with respect to the main step member. It is a perspective view of the state in which the sub-step member of the first step is projected substantially horizontally with respect to the main step member. It is a perspective view which shows the storage state of the said 1st step. It is a perspective view which shows the half-developed state of the 1st step. It is a perspective view which shows the maximum expansion state of the said 1st step.

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

The aerial work platform 1 has a driving cab 7 at the front of the vehicle body 2, and is configured based on a truck-type vehicle that can travel by a pair of left and right front wheels 5f and rear wheels 5r arranged in front of and behind the vehicle body 2. There is. The vehicle body 2 includes a chassis frame 3 in which front wheels 5f and rear wheels 5r are arranged, and a vehicle body frame including a subframe 4 mounted on the chassis frame 3.

Jack devices 10 for lifting and supporting the vehicle body 2 are provided on the front, rear, left and right sides of the subframe 4. The jack device 10 includes a pair of left and right front jacks 10f arranged behind the front wheels 5f and a pair of left and right rear jacks 10r arranged behind the rear wheels 5r. Each of the jacks 10f and 10r lifts and supports the vehicle body 2 by driving the jack cylinder 11 (see FIG. 5) provided inside the jack cylinder 11 (see FIG. 5) to lift and support the vehicle body 2, thereby stabilizing the entire vehicle. .. 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 on the subframe 4 (the front part of the mounting area behind the driving cab 7 in the vehicle body 2) is driven by a swivel motor 24 (see FIG. 5) and is configured to be horizontally swivel around the vertical axis. A swivel table 20 is provided. The swivel base 20 is arranged 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 so as to be swingable (undulating) in the vertical direction via a foot pin 21. Further, on the left and right sides of the subframe 4, left and right tool boxes 26L and 26R for storing work tools, work base materials, and the like are provided.

The boom 30 has a configuration in which the base end boom 30a, the intermediate boom 30b, and the tip end boom 30c are assembled in a nested manner in order from the swivel base 20 side, and the telescopic cylinder 31 provided inside the boom 30 (FIG. 5). By the expansion / contraction drive of (see), the boom 30 can be expanded / contracted in the axial direction. Further, an undulating cylinder 23 is straddled between the base end boom 30a and the swivel base 20, and by expanding and contracting the undulating cylinder 23, the entire boom 30 is undulated in the upper and lower surfaces (vertical surfaces). Can be made to.

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 swing-controlled by a leveling device (not shown) disposed between the tip boom 30c and the boom 30, and the vertical post is always held in a vertical posture regardless of the undulations of the boom 30. It has a structure of Further, a workbench 40 for boarding a worker is attached to the vertical post via a workbench bracket (not shown). A swing motor 41 (see FIG. 5) is provided inside the workbench bracket, and by driving the swing motor 41, the entire workbench 40 is swung around a vertical post (horizontal turning). Can be moved). Here, since the vertical post is always maintained in a vertical posture as described above, as a result, the floor surface of the workbench 40 is always held horizontally regardless of the undulation angle of the boom 30.

The workbench 40 is provided with a work operation device (upper operation device) 45 provided with various operation means such as an operation lever, an operation switch, and an operation dial operated by an operator on the workbench 40. Therefore, the worker on the workbench 40 operates the work operation device 45 to swivel the swivel table 20 (rotational operation of the swivel motor 24) and undulate operation of the boom 30 (expansion / contraction operation of the undulating cylinder 23). , The expansion and contraction operation of the boom 30 (expansion and contraction operation of the expansion and contraction cylinder 31), the swing operation of the workbench 40 (rotational operation of the swing motor 41), and the like can be performed. Although not shown, the vehicle body 2 is also provided with a work operation device (lower operation device) so that a worker on the ground or on the vehicle body 2 can perform the above operation operation.

As shown in FIG. 5, the operating mechanisms of the jack device 10 and the aerial work device (the swivel table 20, boom 30, work table 40, etc. described above) provided on the vehicle body 2 are the jack operation device 15 and the work operation device 45. To operate the controller 50 to which the operation signal is input from the above, the jack cylinder 11, the swivel motor 24, the undulating cylinder 23, the telescopic cylinder 31, and the swing motor 41 (hereinafter collectively referred to as "hydraulic actuator 55"). It is configured to include 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 it to the hydraulic unit 60. ing.

The hydraulic unit 60 is a pump drive motor 61 that receives 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. It includes 62, a control valve 63 provided corresponding to each of the hydraulic actuator 55, and an oil tank T for storing 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 response to control signals from the controller 50 (control signals corresponding to the operation signals from the jack operating device 15 and the work operating device 45). The direction and supply amount are controlled, and the operating direction and operating speed of each hydraulic actuator 55 are controlled (jack device 10).
And control the operating direction and operating speed of the aerial work platform).

In the aerial work platform 1 configured in this way, as shown in FIGS. 1 to 4, the boom 30 is reduced to a fully contracted state and is tilted backward, and then the workbench 40 is moved to the boom 30. By swinging to the left, the boom 30 and the workbench 40 are stored in the mounting area behind the driving cab 7 in the vehicle body 2 (rear retracted posture). When the boom 30 and the workbench 40 are in the retracted state (rear retracted posture), the tip of the boom 30 is located 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 platform 40 is located on the vehicle body 2 on the rear left side.

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

The boarding / alighting path 80 includes a swing-deploying 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 100 provided adjacent to the right side of the first step 100. The two steps 200, the third step 300 provided adjacent to the front of the second step 200 and also used as the tool box 26 on the left side, and the third step 300 provided adjacent to the right side of the third step 300. A step 400 and a step 400 are arranged. Each step 100 to 400 is formed with its upper surface side as a tread that serves as a scaffold for the worker. The first to fourth steps 100 to 400 are formed in a four-step step shape that gradually increases from the first step 100 to the fourth step 400.

Here, as a general parking state of the aerial work platform 1, the vehicle is parked in a state of being moved to the left side of the road so as not to obstruct the flow of other traffic. However, there are often obstacles such as guardrails and side walls of buildings on the side of the road, and when adopting the specification of getting on the vehicle body 2 from the side of the vehicle (so-called side entry), conventional In the above technique, there is a problem that the step cannot be extended to the side unless there is a deployment space (swing space) on the side of the vehicle for at least the length of the step. Therefore, in the present embodiment, the first step 100 for side boarding employs a two-step deployment method in order to minimize the deployment radius (swing radius).

Then, the structure of the first step 100 of this embodiment will be described below with reference to FIGS. 6 to 10. The first step 100 includes an upper step member 110 and a lower step member 120 that form the main body of the skeleton of the first step 100, and a parallel link mechanism 130 that supports the upper step member 110 and the lower step member 120 so as to be relatively swingable. Is configured with. The first step 100 is configured to be accommodating (storable) in the opening 201 opened on the left side of the second step 200.

The upper step member 110 includes an upper frame main body 111 bent and formed in a substantially U shape, a base plate 112 having an L-shaped cross section erected between both ends of the upper frame main body 111, and a central portion of the upper frame main body 111. It is configured to include a support plate 113 having an L-shaped cross section joined to the above.

The upper frame main body 111 is formed by bending one pipe material into a U shape, and has a pair of vertical frame portions 111a and a horizontal frame portion 111b connecting the pair of vertical frame portions 111a to each other. Has been done. A pair of upper connecting plates 114 connected 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 abut and receive the tread 122 of the lower step member 120, which will be 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 with a plurality of bolts in the joint surface with the horizontal frame portion 111b of the support plate 113. Further, a rubber member 116 for cushioning (for shock absorption) that comes into contact with the rear wheel 5r on the left side 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 formed by being bent substantially vertically from the 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 with a plurality of bolts, and the hinges 117 and 202 (hereinafter referred to as "consistently") are fastened to the board portion 112a. The upper step member 110 is mounted so as to be swingable in the vertical direction around the "hinge shaft"). Here, the upper step member 110 has an upper retracted posture in which the tip side (support plate 113 side) swings upward around the hinge axis and is stored in the opening 201 of the second step 200, and the tip side (the tip side (support plate 113 side). The support plate 113 side) swings downward about the hinge axis, and the posture can be changed from the upper deployment posture protruding outward from the opening 201 of the second step 200. Between the pair of inner hinges 117 on the base plate 112, a locking tool 118 that engages with the locked tool (not shown) provided on the lower step member 120 in a detachable manner is attached. ..

The lower step member 120 includes a lower frame main body 121 bent and formed in a substantially U shape, and a tread 122 erected between both ends of the lower frame main 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 main 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 to each other. Has been done. A pair of lower connecting plates 123 connected to the parallel link mechanism 130 are joined to each vertical frame portion 121a. A rectangular annular first grip portion 124 that the operator grips with his / her fingers when deploying or storing the first step 100 is joined to the horizontal frame portion 121b. The first grip portion 124 is composed of a fixed side half body 124a joined to the horizontal frame portion 121b and a movable side half body 124b fixed to the fixed side half body 124a by a pair of bolts and nuts. By loosening the nut, the tilting posture of the movable side half body 124b with respect to the fixed side half body 124a can be adjusted.

The tread 122 is formed in a curved plate shape bent into a substantially L-shaped cross section, and is joined to the tip end portion of each vertical frame portion 121a. On one end surface (upper surface of FIG. 9) of the tread 122, a tread S1 that serves as a scaffold for an operator to get on and off is formed in the first getting on and off method described later. The above-mentioned upper step member 110 is formed with treads S2 and S3 that serve as scaffolding for workers to get on and off in the second getting on and off method described later. Further, the tread 122 is formed with a rectangular annular second grip portion 125 that the operator grips with his / her fingers when deploying or storing the first step 100. The second grip portion 125 is formed so as to project into the U-shaped opening of the lower frame main body 121.

The parallel link mechanism 130 is composed of a pair of link members 131 and 132 formed to have substantially the same length and arranged in parallel with each other. The link members 131 and 132 are erected between the upper connecting plate 114 of the upper step member 110 and the lower connecting plate 123 of the lower step member 120. One end of the first link member 131 is pivotally connected to the inner surface side of the upper connecting plate 114 of the upper step member 110, and the other end is pivotally connected to the inner surface side of the lower connecting plate 123 of the lower step member 120. One end of the second link member 132 is pivotally connected to the outer surface side of the upper connecting plate 114 of the upper step member 110, and the other end is pivotally connected to the outer surface side 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 placed at the apex position of. Here, the length of each of the link members 131 and 132 is formed to be substantially half the length of the vertical dimension of each of the step members 110 and 120. Further, as shown in FIG. 10, the upper step member 110 and the lower step member 120 have the step members 110 and 120 in the vertical direction (vertical direction in FIG. 10) in a state where the link members 131 and 132 extend substantially horizontally. ) Are offset by approximately half the length of the vertical dimensions of the step members 110 and 120 (the lengths of the link members 131 and 132).

Here, the lower step member 120 can swing up and down about the hinge axis integrally with the upper step member 110, and the upper step member 120 is formed by the parallel link mechanism 130 composed of the pair of link members 131 and 132. It is configured to be able to swing relative to each other while maintaining a positional relationship parallel 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 (upper step member 110 and around the hinge axis). The posture can be changed between the lower retracted posture (which overlaps with the upper step member 110) and the lower deployed posture which swings in a direction away from the upper step member 110 and projects outward of the upper step member 110. Specifically, when the upper step member 110 is in the upper deploying posture, the lower step member 120 is swung upward so that the lower step member 120 is stored so as to overlap the upper step member 110 on the left and right sides. Displace to the retracted position. On the other hand, when the upper step member 110 is in the upper deploying posture, by swinging the lower step member 120 downward, the lower step member 120 is displaced to the lower deploying posture protruding downward from the upper step member 110.

Next, as a characteristic operation of the boarding / alighting device of the aerial work platform 1 according to the present embodiment, the work flow from the worker to boarding the workbench 40 through the boarding route 80 is described in FIGS. 11 to 13. Will be additionally referred to and explained.

First, the worker who arrives at the work site moves the aerial work platform 1 to the left side of the road and parks it so as not to interfere with other traffic. Next, after installing a color cone (registered trademark) or the like around the vehicle to ensure traffic safety, the jacks 10f and 10r are projected and grounded to stably hold the vehicle body 2. Subsequently, the worker will board the workbench 40 from the ground through the boarding / alighting route 80 (first to fourth steps 100 to 400) on the vehicle body 2 in order to perform the desired aerial work. At this time, as shown in FIG. 11, the first step 100 (upper step member 110 and lower step member 120) is folded and stored in the opening 201 of the second step 200 (referred to as “stored state”). ). The retracted state of the first step 100 is a state in which the upper step member 110 is in the upper retracted posture and the lower step member 120 is in the lower retracted posture. Therefore, the worker on the ground moves to the vicinity of the first step 100 and performs the deployment work for projecting the first step 100 to the side of the vehicle before getting on the vehicle body 2.

In the unfolding work of the first step 100, the upper step member 110 and the lower step member 120 are unfolded 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 fixed state in the opening 201 of the second step 200.

First, as the first stage deployment work, the operator first unlocks the first step 100 by the lock mechanism 203, and then, as shown in FIG. 12, lowers the entire first step 100 around the hinge axis. The upper step member 110 and the lower step member 120 are displaced downward from the opening 201 of the second step 200 (referred to as “mid-deployed state”). The midway deployed state of the first step 100 is a state in which the upper step member 110 is in the upper deployed posture and the lower step member 120 is in the lower retracted posture. In this first-stage deployment work, the upper step member 110 and the lower step member 120 swing downward in a state of being overlapped with each other around the hinge axis (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 the swing radius according to the length of each step member 110, 120 alone (about half the length of the entire first step 100). It can be suppressed to the swing radius of. When the upper step member 110 and the lower step member 120 are swung downward in this way, the rubber member 116 arranged on the back surface side thereof first comes into contact with the side surface of the rear wheel 5r. It is possible to absorb the impact at the time of descent and to relax the load when the operator gets on and off after that. Further, when the first step 100 is in the halfway expanded state, the opening 201 of the second step 200 is opened to the left side, so that the lower tread 204 of the second step 200 is exposed and the upper side is exposed. It will be available to workers along with the tread 205.

Subsequently, as the second stage deployment work, the operator swings the lower step member 120 downward with respect to the upper step member 110, and causes the lower step member 120 to be moved downward with respect to the upper step member 110, as shown in FIG. It is displaced from 110 to a state of protruding downward (referred to as "maximum unfolded state"). The maximum unfolded state of the first step is a state in which the upper step member 110 is in the upper unfolded posture and the lower step member 120 is in the lower unfolded posture. When the first step 100 is in the maximum deployed state, a tread surface S1 serving as a scaffold for an operator to get on and off is formed on the upper surface of the tread 122 of the lower step member 120. In the second stage deployment work, the lower step member 120 does not jump out to the side of the vehicle (to the left outside) beyond the swing radius in the first stage deployment work. Therefore, in the unfolding work 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 corresponding to the swing radius of the first step.

Next, after the first step 100 is set to the maximum deployed state, the operator puts his / her foot on the tread S1 of the first step 100 and gets on the second step 200. Then, the worker goes on the boarding / alighting route 80 with his / her feet in the order of the third step 300 and the fourth step 400, and finally gets on the workbench 40.

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

In this second boarding / alighting method, the first step 100 (upper step member 110 and lower step member 120) is used in a state of being folded and stored in the opening 210 of the second step 200 (stored state). .. As described above, the retracted state of the first step 100 is a state in which the upper step member 110 is in the upper retracted posture and the lower step member 120 is in the lower retracted posture. In this second boarding / alighting method, the worker on the ground first puts 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 retracted state diagonally above the auxiliary step 500. When the first step 100 is in the retracted state, the tread S2, which serves as a scaffolding on the lower stage side when the worker gets on and off, is arranged upward on the base plate 112, and the worker gets on and off the support plate 113. The tread S3, which serves as a scaffold on the upper side of the time, is arranged facing upward. Therefore, when moving from the auxiliary step 500 to the first step 100, the operator can put his foot on the upper and lower treads S2 and S3 of the first step 100 and get on the vehicle body 2. 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 boarding of the upper tread surface S3 (FIG. 6, FIG. See FIG. 11 and the like). Then, the worker goes on the boarding / alighting route 80 with his / her feet in the order of the third step 300 and the fourth step 400, and finally gets on the workbench 40.

As described above, according to the aerial work platform 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, so that the entire step 100 is moved to the side of the vehicle. Even if there is no empty space (deployment space) left according to the length, the upper step member 110 and the lower step member 120 are swung step by step in order to deploy the first step 100 in a space-saving manner. Therefore, the vehicle can be moved as close as possible to the edge of the road, and as a result, it is possible to safely get on and off the work platform 40 from the ground without obstructing the flow of traffic.

Further, in the aerial work platform 1 according to the present embodiment, in the first deployment work of the two-stage deployment work, the upper step member 110 and the lower step member 120 are swung around the hinge axis in a state of being overlapped with each other. This makes it possible to minimize the swing radius (deployment radius) of the upper step member 110 and the lower step member 120.

Further, in the aerial work platform according to the present embodiment, when the first step 100 is in the maximum deployed state, the tread surface S1 of the lower step member 120 is on the left side (outside in the vehicle width direction) with respect to the upper step member 110. By arranging it at an offset position, it is easy to see the tread S1 from above the vehicle body 2, and it becomes a target when descending from above the vehicle body 2 to the ground. There is no risk of stepping off the tread surface S1, and it is possible to further improve the safety of work when getting on and off.

Further, in the aerial work platform 1 according to the present embodiment, even in a situation where the deployment space of the first step 100 cannot be secured due to the width of the vehicle being moved to the left side of the road (the first step 100 is deployed). (Even if it is not possible), since the treads S2 and S3 dedicated to the retracted state are installed in this first step 100, if there is a space on the side of the vehicle that one worker can enter. The worker can get on and off the workbench 40 by putting his foot on the treads S2 and S3. Therefore, it is possible to change the usage method of the first step 100 according to the width adjustment situation of the vehicle, and it is possible to provide a very convenient boarding / alighting step for the operator.

Further, in the aerial work platform 1 according to the present embodiment, in addition to the steps 100 and 500 dedicated to side boarding, steps 600 and 700 dedicated to rear boarding are provided (other steps 200 to 400 are also used). Type), as a method of getting on and off the workbench 40 from the ground, the worker can select either a rear boarding method or a side boarding method according to the parking state of the vehicle or the like.

As shown in FIG. 5, the aerial work platform 1 of the present embodiment may be provided with a storage detector 140 for detecting the storage state of the first step 100. 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 not retracted, the retractable detector 140 swings outward due to the elastic force of the built-in spring, so that the limit switch is in the detection off state and is turned off toward the controller 50. Output a signal (unstored detection signal). On the other hand, when the first step 100 is in the retracted state, the storage detector 140 detects on by the contact being pushed inward by the upper step member 110 or the lower step member 120 against the elastic force of the built-in spring. The state is set, and an on signal (storage detection signal) is output to the controller 50.

Further, in the aerial work platform 1 of the present embodiment, a configuration is adopted in which the driving cab 7 is provided with a storage display device (storage notification means) 150 for notifying whether or not the first step 100 is in the stored state. May be good. The storage display device 150 is composed of, for example, an LED lamp or a liquid crystal display. When the controller 50 inputs an on signal (storage detection signal) from the storage detector 140, the controller 50 causes the storage display device 150 provided in the operation cab 7 to display that the first step 100 is in the stored state. On the other hand, when the controller 50 inputs an off signal (unstored detection signal) from the storage detector 140, the controller 50 causes the storage display device 150 provided in the operation cab 7 to display that the first step 100 is in the non-storage state. .. As a result, the worker confirms the display contents of the storage display device 150 before starting the operation of the aerial work platform 1 at the end of the work, so that the worker sideways without storing the first step 100. It is possible to prevent a situation in which the aerial work platform 1 is accidentally driven while the overhanging state is maintained. 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.

The present invention is not limited to the above embodiment, and can be appropriately improved as long as it does not deviate from the gist of the present invention.

For example, in the above embodiment, the telescopic boom type aerial work platform has been described as an example as the aerial work platform according to the present invention, but the present invention is not limited to this, and for example, the bending / stretching boom type aerial work platform is described. It may be a work vehicle, a road-rail vehicle, or the like, and the present invention can be applied to any aerial work platform that employs a configuration in which the boom is held in the rear retracted posture on the vehicle body. Further, in the above-described embodiment, the electric drive type (battery drive type) aerial work platform has been described as an example, but the present invention is not limited to this, and the power of the engine is powered by the PTO mechanism (power take-off mechanism). It may be a PTO-driven aerial work platform that is taken out to drive a hydraulic pump, or a hybrid aerial work platform that is equipped with both of them and selectively switches the power source.

1 Aerial work platform 2 Body 7 Driving cab 20 Swing table 30 Boom 40 Workbench 45 Work operation device 80 Boarding / alighting route 100 1st step (boarding / alighting 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 (pivot shaft)
S1 tread S2 tread S3 tread

Claims (4)

A vehicle that has a driving cab at the front of the vehicle body and can travel, a swivel that is horizontally swivelly provided in the front part of the mounting area behind the driving cab in the vehicle body, and a swivel that can freely undulate on the swivel. A workbench attached to the boom and a workbench attached to the tip of the boom so as to swing freely with respect to the boom were provided, and the boom was laid down backward to swing the workbench sideways. In the aerial work platform configured so that the boom and the workbench are housed in the mounting area in the state.
A boarding / alighting step used when getting on / off the workbench is provided on the left and right sides of the vehicle body on the side where the retracted workbench is located.
The boarding / alighting step includes an upper step portion swingably provided with respect to the vehicle body and a lower step portion swingably provided with respect to the upper step portion.
The upper step portion can change its posture between a first retracted posture that swings upward and is stored in the vehicle body and a first deployed posture that swings downward and projects outward from the vehicle body. Configured
The lower step portion is stored so as to swing in a direction close to the upper step portion and overlap with the upper step portion in a state where the upper step portion is in the first deployment posture. And the posture can be changed between the upper step portion and the second deployed posture which swings in a direction away from the upper step portion and projects outward from the upper step portion in the state where the upper step portion is in the first deployed posture. Consists of
In a state where the entire boarding / alighting 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, the lower step portion is swung 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. A boarding / alighting device for aerial work platforms, which is configured so that the entire boarding / alighting step is expanded. The upper step portion is configured to swing up and down about a pivot shaft provided on the vehicle body.
When the lower step portion is in the second retracted posture with respect to the upper step portion, the upper step portion and the lower step portion are configured to overlap each other in the circumferential direction of the pivot axis. The aerial work platform boarding / alighting device according to claim 1. A parallel link mechanism for connecting the upper step portion and the lower step portion in parallel is provided.
The lower step portion is configured to be swingable with respect to the upper step portion by the parallel link mechanism.
1. The aerial work platform boarding / alighting device according to 2. The entire boarding / alighting step is configured to be upside down in a state where the entire boarding / alighting step is deployed to the outside of the vehicle body and a state in which the entire boarding / alighting step is stored on the vehicle body.
The tread is arranged upward in a state where the entire boarding / alighting step is deployed outward of the vehicle body.
The aerial work platform according to claim 3 , wherein a tread surface different from the tread surface is arranged upward in a state where the entire boarding / alighting step is stored on the vehicle body. ..

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