JP2000053389A - Workbench of vehicle for high lift work, and safety device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a workbench which does not abut on objects, even if a vehicle travels in a state that the workbench is stored in the vehicle and can be gotten on and off by a worker easily and safely. SOLUTION: A workbench 11 mounted at a tip part of an elongating/ contracting boom provided on a rear part of a car body so that the boom may be raised/laid and freely rotatable has a workbench bottom part 17 connected with the tip part of the elongating/contracting boom. At a peripheral edge upper part of the workbench bottom part 17, a freely elongating/contacting cylindrical workbench peripheral edge part 19 is stood. A ring-shaped frame 21 is provided at an upper peripheral edge of the working bench peripheral edge part 19. A plurality of elongating and contracting rods 23 elongating or reducing the workbench peripheral edge part 19 by connecting one end with this frame 21, fixing the other end to the workbench bottom part 17 and moving the frame 21 in the vertical direction are provided. Therefore, the height of the workbench 11 is changed by performing an elongating and contracting operation for the elongating and contracting rods 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a workbench for an aerial work vehicle and a safety device therefor, and more particularly, to a workbench provided at a distal end of a telescopic boom and an aerial work vehicle having the workbench. Related to safety devices.

[0002]

2. Description of the Related Art An aerial work vehicle pivotally supports a telescopic boom, which can freely expand and contract, move up and down, on a swivel provided on a vehicle body.
Some telescopic booms have a work table provided at the tip thereof. In this aerial work vehicle, the workbench is moved to a desired work position at a higher position by raising and lowering and extending the telescopic boom at the time of work, and the work is performed by an operator. When the work is completed, the telescopic boom is stored on the vehicle body. The stored workbench of the telescopic boom is disposed above a driver's seat provided in front of the vehicle body.

[0003]

However, when the vehicle is run with the work table stored above the driver's seat, the driver must pay considerable attention. This is because when the height from the ground or the like on which the vehicle is mounted to the upper part of the worktable is high, there is a possibility that the worktable may be caught or collided. In addition, when the operator gets on and off the worktable, the worker must put his foot on the upper part of the worktable, and there is a problem that if the step is removed, the worker may fall. In addition to the case where the work table is stored above the driver's seat, the same problem occurs when the work table is stored at the rear of the vehicle.

Therefore, a telescopic worktable whose height can be changed is desired. However, when the telescopic work table is extended and the vehicle is run in a state of being stored above the driver's seat or at the rear of the vehicle, As in the case of the conventional worktable, there is a risk that an object may be caught or collided with the worktable, and safety during traveling of the vehicle cannot be ensured.

[0005] The present invention has been made in view of such a problem, and in an aerial work vehicle that stores a worktable above a driver's seat, even if the vehicle runs with the worktable stored therein, It is an object of the present invention to provide a work table that does not cause a collision with an object and that enables an operator to easily and safely get on and off the vehicle, and a safety device that can ensure the safety of the vehicle while traveling.

[0006]

In order to solve the above-mentioned problems, a workbench of an aerial work vehicle according to the present invention is attached to a distal end portion of a telescopic boom which is provided on a vehicle so as to be able to swing up and down and turn. This workbench is fixed to the workbench bottom that is connected to the tip of the telescopic boom, a cylindrical workbench rim that stands up and down from the periphery of the workbench bottom, and an upper rim of the workbench rim. The upper edge of the worktable (for example, the frame 21 in the embodiment), one end of which is connected to the upper edge of the worktable, and the other end is fixed to the bottom of the worktable. And a plurality of telescopic operating means (for example, telescopic rod 23 in the embodiment) for extending or contracting the periphery of the worktable.

[0007] To extend the work table, the telescopic operation means is operated. That is, the expansion / contraction operation means extends, and the upper edge of the worktable moves upward. The workbench extends as the workbench peripheral edge extends upward with the movement of the workbench upper edge. Also, in order to reduce the worktable, reduce the extended telescopic operation means and move the upper edge of the worktable downward,
The workbench periphery is reduced downward.

The bottom of the worktable preferably has a shape on which an operator can board, and for example, a plate shape can be exemplified. It is preferable that the worktable peripheral portion has an elastic function, and examples thereof include those configured in a bellows-like or nested manner.
It is preferable that the upper edge of the worktable is fixed to an upper peripheral edge of the periphery of the worktable to form a ring. The upper edge portion of the worktable may be formed in a ring shape and may have any shape that allows an operator to enter and exit, and examples thereof include a circular shape and a polygonal shape. It is preferable that the telescopic operation means has a function of expanding and contracting the workbench peripheral part,
For example, a telescopic rod can be exemplified. It is preferable that the expansion / contraction operation means is provided upright at a corner of the bottom of the worktable or at a position having a predetermined gap in the circumferential direction. By disposing the extension / contraction means at the corner of the workbench bottom or the like, the worktable peripheral edge can be extended / contracted in a stable state.

The workbench of the aerial work vehicle has a bottom having a cylindrical shape with a bottom connected to the tip of the telescopic boom, and a workbench bottom inside or outside the workbench bottom. A workbench upper part movably provided in the upper side of the workbench bottom or a side wall outer surface of the workbench bottom at least one of which is provided with an engagement groove extending vertically.
An engaging projection that engages with an engaging groove is provided on one of the inner surface of the side wall of the workbench bottom and the outer surface of the side wall of the workbench upper, or one of the outer wall surface of the worktable bottom and the inner surface of the worktable upper wall It is preferable that at least one of the engagement grooves is provided with a vertically extending engagement groove, and that the upper portion of the worktable moves in the vertical direction along the engagement groove with which the engagement protrusion engages.

[0010] The engagement groove only needs to be able to move the upper part of the worktable in the vertical direction inside or outside the bottom part of the worktable, and the locus may be the vertical direction, the horizontal direction, the spiral direction of the worktable, or a combination thereof. For example, the engagement groove may be composed of an upper and lower groove extending in the vertical direction, a horizontal groove communicating with the upper and lower groove and extending in the horizontal direction, and a locking groove extending downward in communication with the horizontal groove. When the engagement groove is configured in this manner, the upper portion of the worktable can be locked to the lower portion of the worktable by locking the engagement protrusion to the lock groove. Therefore, there is no danger that the upper part of the worktable will move downward during the work, so that the worker who has boarded the worktable can work with peace of mind.

Further, the aerial work vehicle having the safety device according to the present invention is attached to a tip end of a telescopic boom provided on the vehicle so as to be able to swing up and down, and is stored at a predetermined position on the vehicle. The work table according to any one of (1) to (3) is provided. The safety device for the aerial work platform includes a workbench detecting means for detecting whether the height of the workbench is low and a vehicle traveling for detecting whether the vehicle is going to run. Detecting means (for example, the power take-off SW 41 in the embodiment) and the workbench detecting means detect that the height of the workbench is not low, and the vehicle is enabled to run by the vehicle runnability detecting means. It is preferable to have a warning operation control unit (for example, the controller 45 in the embodiment) that performs a warning operation when it detects that there is something.

When the work table is stored at a predetermined position and is not in a low state and the vehicle is going to run, the warning operation control means performs a warning operation and the driver And inform workers of danger. Here, the vehicle running possibility detecting means has a function of detecting a state in which the vehicle is going to run, for example, when a state in which the driving force of the engine is switched to a side in which the vehicle runs by a power take-off SW is detected. And a case where the state where the side brake is released is detected, and a case where the state where the change lever is shifted from the N range to the D range in the transmission of the vehicle is detected. The warning operation includes turning on a warning light, sounding an alarm buzzer, and restricting the running of the vehicle.

Further, the aerial work vehicle having the safety device of the present invention is attached to a tip end of a telescopic boom provided on the vehicle so as to be able to swing up and down, and is stored at a predetermined position on the vehicle. It is preferable to have the worktable described in any one of Items 1 to 3, and a plurality of jacks projecting to the side of the vehicle and stably supporting the vehicle body.

The safety device includes a workbench detecting means for detecting whether or not the height of the workbench is low, and an operation detecting means for detecting an operation for changing the jack from the extended state to the retracted state (for example, Jack storage S in the embodiment
W47) and when the workbench detecting means detects that the height of the workbench is not low, and when the operation detecting means detects an operation of changing the jack from the overhanging state to the retracted state, the operation of the jack is stopped. It is preferable to have an operation restricting means (for example, the determining circuit 49 and the signal restricting circuit 51 in the embodiment) for restricting and keeping the jack extended. If the workbench is stored in a predetermined position on the vehicle and the height of the workbench is not low, when attempting to store the overhanging jack in the vehicle body, the operation of the jack is restricted and the jack is restricted. Is kept overhanging. Therefore, the vehicle cannot be run while the height of the workbench remains high, so that the safety of the aerial work vehicle can be ensured.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS. The present embodiment shows an aspect of an aerial work vehicle having a telescopic boom having a work table at a tip end on which a person who works at an aerial position is boarded.

[0016]

[First Embodiment] FIG. 1 shows a first embodiment of the present invention.
Explanation will be made based on FIG. FIG. 1 shows an aerial work vehicle equipped with an aerial work platform according to a first embodiment of the present invention. First, before describing the workbench of the present invention, an aerial work vehicle will be described. As shown in FIG. 1, the aerial work vehicle 1 includes four vehicle bodies 3 at front, rear, left, and right sides of a vehicle body 3 of a truck (vehicle) T that is freely movable and has a driver's seat 2 in front.
Outrigger jack 5 for supporting the vehicle, a swivel table 7 that can be swiveled at the rear of the vehicle body 3, and a telescopic boom 9 that is pivotably mounted on the upper part of the swivel table 7 so as to be able to expand and contract.
And a worktable 11 provided at the tip of the telescopic boom 9
And

An up-and-down cylinder 1 for raising and lowering the telescopic boom 9 between the bottom of the swivel 7 and an intermediate portion of the telescopic boom 9.
The telescopic boom 9 is provided with a telescopic cylinder 15 for expanding and contracting the telescopic boom 9. A turning motor (not shown) is provided below the turning table 7.
With such a configuration, the operator gets on the work table 11 and operates the swivel table 7 and the telescopic boom 9, whereby the work table 11
Can be moved to a desired height to perform the operation.

Each operation of the swivel 7 and the telescopic boom 9 is performed by the operation of hydraulic motors such as a rotary motor, an up-and-down cylinder 13 and a telescopic cylinder 15. A hydraulic pump P is provided at the center of the vehicle body 3, and hydraulic oil is supplied to each hydraulic actuator by the hydraulic pump P. The driving force of the traveling engine E that drives the rear wheels via the transmission TM is extracted by the power take-off mechanism PTO, and the hydraulic pump P is driven by the extracted driving force.

FIG. 2 is a perspective view of the work table 11, FIG. 2 (a) shows the work table 11 in an extended state, and FIG. 2 (b) shows the work table 11 in a contracted state. As shown in FIG.
At the bottom of the worktable 11, a plate-shaped and worktable bottom 17 having a circular shape is provided, and at the upper part of the periphery of the worktable bottom 17, an expandable and contractible cylindrical worktable peripheral edge 19 is erected. .
The worktable peripheral edge 19 is made of rubber and has a bellows shape. A ring-shaped frame (workbench upper edge) 21 is provided at the upper end of the workbench peripheral portion 19, and the workbench peripheral portion 19 and the frame 21 are integrally formed. Four telescopic rods 23, which are arranged on the periphery of the workbench bottom portion 17 and inside the workbench peripheral portion 19, have a certain distance in the circumferential direction, and stand upright.

The telescopic rod 23 is formed by nesting a plurality of rod-shaped telescopic members 23a.
By sliding 3a in the axial direction of the telescopic rod 23, the telescopic rod 23 expands and contracts. The telescopic rod 23 may be operated manually or may be operated using hydraulic pressure. The top of the telescopic rod 23 is connected to the bottom of the frame 21. Therefore, by expanding and contracting the telescopic rod 23,
The workbench peripheral portion 19 moves up and down via the frame 21 to change the height A of the workbench 11. That is,
The height A of the worktable can be increased by extending the telescopic rod 23, and the height A of the worktable can be reduced by reducing the telescopic rod 23, as shown in FIG. Can be.

The shape of the worktable 11 is not limited to that shown in FIG. 2, but may be configured as shown in FIG. Here, FIG.
(A) shows the extended state of the worktable 11, and (b) shows the contracted state of the worktable 11. As shown in FIG.
The worktable bottom 17 has a rectangular shape in a plan view, and telescopic rods 23 stand upright at each corner of the worktable bottom 17. A rectangular frame 21 is provided at an upper portion of the workbench peripheral portion 19, and a distal end of a telescopic rod 23 is connected to a lower portion of the frame 21. Therefore, by operating the telescopic rod 23 to extend and retract, the workbench peripheral portion 19 moves up and down via the frame 21 to change the height of the workbench 11.

Next, the operation of the first embodiment of the present invention will be described with reference to FIGS. First, aerial work vehicle 1
Is moved to the work place, the telescopic boom 9 is set in the retracted state. That is, the operating table 11 is arranged above the driver's seat 2 by operating the up-and-down cylinder 13, the telescopic cylinder 15, and the swivel table 7, and the height of the operating table 11 is reduced. Therefore, the height from the ground or the like on which the aerial work vehicle 1 is mounted to the work table 11 can be reduced, so that the driver of the aerial work vehicle 1 can drive without worrying about the work table 11. You can concentrate.

Here, in order to reduce the worktable 11, 4
This is performed by reducing the length of the two telescopic rods 23. That is, the frame 21 connected to the distal end of the telescopic rod 23
Is pressed downward from above to reduce the four telescopic rods 23. At the same time, the worktable peripheral edge 19 connected to the frame 21 is reduced. Therefore, the worktable 11 is reduced.

Next, with the reduced work table 11 stored above the driver's seat 2, the driver moves the aerial work vehicle 1 to the work site. Then, the operator gets on the worktable 11. At this time, the operator can get on the work table 11 across the frame 21 without stepping on the upper part of the frame 21 from above the driver's seat 2. Therefore, the worker does not step on the upper part of the frame 21, so that the operator can easily get in the vehicle and there is no possibility that the operator steps off and falls over the driver's seat 2.

Next, the operator extends the work table 11.
That is, the operator raises the frame 21 upward. At the same time, the telescopic rod 23 extends, and the workbench peripheral portion 19 extends. Therefore, the workbench 11 is extended, and the workbench peripheral portion 19 covers the periphery of the worker, so that the worker can work safely.

[0026]

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the first
Only the differences from the first embodiment will be described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted. 4A and 4B show the worktable 11, FIG. 4A shows the worktable 11 in an extended state, and FIG. 4B shows the worktable 11 in a contracted state. As shown in FIG. 1A, a worktable 11 is a bottomed worktable bottom 17 having a cylindrical shape, and a tube provided inside the worktable bottom 17 so as to be slidable in the vertical direction within the worktable bottom 17. And a work table upper part 27 having a shape of a circle.

An engagement groove 29 is formed on the inner surface of the side wall of the worktable bottom 17.
Is provided. The engagement groove 29 is provided on the worktable bottom 17.
An upper and lower groove 31 extending upward from a lower portion of the inner surface of the side wall, a horizontal groove 33 communicating with the upper and lower grooves 31 and extending horizontally from the upper part of the upper and lower grooves 31 in a horizontal left direction, and a horizontal groove 33 communicating with the horizontal groove 33. And a locking groove 35 extending downward from the left end. An engagement protrusion 37 that protrudes outward is provided at a lower portion of the outer surface of the side wall of the workbench upper portion 27. The engagement protrusion 37 engages with the engagement groove 29 and moves in accordance with the vertical groove 31, whereby the workbench upper portion 27 moves inside the workbench bottom portion 17 in the vertical direction. In addition, the workbench upper portion 27 can be locked to the workbench bottom 17 by engaging the engagement protrusion 37 with the lower portion of the lock groove 35 via the horizontal groove 33. Therefore, since the workbench upper part 27 does not drop during the work of the worker, the worker can concentrate on the work, and the work efficiency can be improved.

As shown in FIG. 2B, when the operator gets on or off the work table 11 or stores the work table 11 above the driver's seat 2, the work table upper part 27 is moved to the work table. By storing in the bottom part 17, the height of the worktable 11 can be reduced. That is, after the worker raises the workbench upper portion 27 to move the engagement protrusion 37 upward along the locking groove 35, the workbench upper portion 27 is rotated to engage the engagement protrusion 3.
7 is moved to the right in the horizontal direction along the horizontal groove 33. Then, the workbench upper portion 27 is pressed downward to move the engagement protrusion 37 downward along the upper and lower grooves 31. Then, the workbench top 27 is stored in the workbench bottom 17. Therefore, the operator can easily and safely get on and off the workbench 11.

[0029]

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, only the differences from the second embodiment will be described, and the same parts as those of the second embodiment will be denoted by the same reference numerals and description thereof will be omitted. As shown in FIG. 4 (a), whether or not the workbench 11 is in a contracted state (a state in which the workbench upper part 27 is stored in the workbench bottom 17) is located above the bottom plate 17 a of the workbench bottom 17. A storage detection sensor 39 for detecting is provided. The storage detection sensor 39 is provided on the workbench upper part 2.
When the workbench upper 7 is lowered and the workbench upper portion 27 is stored in the workbench bottom portion 17, the workbench upper portion 27 abuts on the workbench bottom portion 17 by the bottom of the workbench upper portion 27 abutting against the storage detection sensor 39. Is stored.

As shown in FIG. 5, the aerial work vehicle 1 has a power take-off switch (PTOSW) 41 for switching whether or not the driving force of the traveling engine E is taken out to the hydraulic pump P by the power take-off mechanism PTO. An alarm buzzer 43 for notifying a driver or worker of the aerial work vehicle 1 or the work platform 11 of a danger by sound and a storage detection sensor 39 detect that the work platform 11 is in an extended state, and a power take-off switch 41 Is detected (a state in which the power take-off mechanism PTO has not taken out the driving force from the engine E and the vehicle is able to travel by transmitting the driving force from the engine E to the vehicle), the alarm buzzer 43 is activated. And a controller 45 that operates to generate a sound. That is, the safety device 46 includes the storage detection sensor 39, the power take-off switch 41, the controller 45, and the alarm buzzer 43.

Therefore, when the workbench 11 is in the extended state and the power take-off switch 41 is connected and the driving force of the engine E is transmitted to the rear wheels, a sound is generated from the alarm buzzer 43. Can recognize that running a vehicle cannot ensure safety.

[0032]

Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, the third
Only the differences from the third embodiment will be described, and the same parts as those in the third embodiment will be denoted by the same reference numerals and description thereof will be omitted. As shown in FIG. 6, in addition to the storage detection sensor 39, the safety device 46 includes a jack storage switch 47 that outputs an operation signal for changing the state of the outrigger jack 5 from the extended state to the storage state, and the storage detection sensor 39. A determination circuit 49 for detecting that the operation signal 11 is in the extended state and determining that an operation signal for changing the outrigger jack 5 from the extended state to the retracted state by the jack storage switch 47 is output; A signal regulating circuit 51 for interrupting the operation signal when the regulation signal is received and maintaining the outrigger jack 5 in a protruding state.
And The controller 45 is provided with a judgment circuit 49.
And a signal regulation circuit 51.

Therefore, even if the workbench 11 is in the extended state and the jack storage switch 47 is pressed in order to change the outrigger jack 5 from the extended state to the retracted state, the signal regulation circuit receiving the regulation signal of the decision circuit 49 is received. Since the operation signal 51 for storing the outrigger jack 5 is blocked, the storage of the outrigger jack 5 can be prevented. Therefore, since the vehicle cannot travel while the work table 11 is extended, it is possible to prevent an object from coming into contact with the work table 11 beforehand.

[0034]

As described above, according to the present invention,
The height of the workbench when retracted in the vehicle is lowered by standing up and down the periphery of the workbench, which can expand and contract upward from the periphery of the workbench bottom. There is no danger of contact with an object, and the driver of the aerial work vehicle can concentrate on driving without worrying about the workbench.

Further, according to the present invention, the upper part of the vertically movable movable workbench is provided inside or outside the bottom of the worktable, and either the inner surface of the side wall of the worktable bottom or the outer surface of the side wall of the worktable upper part is provided. At least one of the upper and lower extending engagement grooves is provided, and at least one of the inner surface of the side wall of the bottom of the worktable or the outer surface of the side wall of the upper portion of the worktable is provided with an engagement protrusion that engages with the engagement groove; An engaging groove extending at least up and down is provided on one of the side wall outer surface or the work table upper side wall inner surface,
An engaging protrusion is provided on one of the outer surface of the side wall of the workbench bottom and the inner surface of the side wall of the workbench upper portion, and the upper portion of the worktable is vertically moved along the engaging groove with which the engaging protrusion engages. , The same effect as a worktable having a worktable peripheral edge that can be extended and contracted can be obtained.

The engagement groove is composed of an upper and lower groove extending in a vertical direction, a horizontal groove communicating with the upper and lower grooves and extending in a horizontal direction, and a locking groove extending downward in communication with the horizontal groove. When the engaging projection is locked in the locking groove and the upper part of the worktable is locked to the bottom part of the worktable, there is no danger that the upper part of the worktable will move downward during the work, so that the workbench is mounted on the worktable. Workers can work with peace of mind.

Further, according to the present invention, a workbench detecting means for detecting whether or not the height of the workbench is low, and a vehicle for detecting whether or not the vehicle is going to run. The runnability detection means and the workbench detection means detect that the height of the workbench is not low, and the vehicle runnability detection means activates a warning when it detects that the vehicle is about to travel. That the workbench is stored at a predetermined position of the vehicle while its height is high, and that the vehicle is enabled to travel by the vehicle travelability detection means. In this state, the warning operation control means performs the warning operation, so that the driver can recognize that safety cannot be ensured when the vehicle is driven.

Further, according to the present invention, the operation detecting means for detecting the operation of changing the jack from the overhanging state to the retracted state, and the operating table detecting means for detecting that the height of the operating table is not low and operating the operating table. When the detecting means detects an operation to change the state of the jack from the overhanging state to the retracted state, the operation of the jack is regulated to maintain the jack in the overhanging state, and the height of the work table is reduced. Even if the vehicle is stored at a predetermined position of the vehicle while the vehicle is kept high, the vehicle cannot travel, so that an object can be prevented from coming into contact with the work table.

[Brief description of the drawings]

FIG. 1 is a front view of an aerial work vehicle having an aerial work platform according to a first embodiment of the present invention.

FIG. 2 shows a workbench of the aerial work platform according to the first embodiment of the present invention, and FIG. 2A shows an extended state of the workbench;
FIG. 2B shows the work table in a reduced state.

FIG. 3 shows a workbench of the aerial work vehicle according to the first embodiment of the present invention, and FIG. 3A shows an extended state of the workbench;
FIG. 2B shows the work table in a reduced state.

FIG. 4 shows a workbench of an aerial work platform according to a second embodiment of the present invention, and FIG. 4A shows an extended state of the workbench;
FIG. 2B shows the work table in a reduced state.

FIG. 5 is a block diagram showing a safety device for an aerial platform vehicle according to a third embodiment of the present invention.

FIG. 6 is a block diagram showing a safety device for an aerial platform vehicle according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Height work vehicle 5 Outrigger jack 9 Telescopic boom 11 Workbench 17 Workbench bottom 19 Workbench peripheral part 21 Frame 23 Telescopic rod 27 Workbench upper part 29 Engagement groove 31 Vertical groove 33 Horizontal groove 35 Locking groove 37 Engagement projection 39 Storage detection sensor 45 Controller 47 Jack storage SW 49 Judgment circuit 51 Signal regulation circuit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Hiroyuki Kuki, Inventor: 1152, Yamashita, Ryoji, Ryoji, Ageo City, Saitama Prefecture Inside of Aichi Corporation Ageo Works (72) Inventor: Hiroshi Fujino 1152, Ryoke, Ryoji, Ryoke, Ageo, Saitama Prefecture No.10 A term of Aichi Corporation Ageo factory F term (reference) 3F333 AA08 AB04 AC01 BA05 BF10 BG10 CA19 DA05 DB04 FA36 FD03

Claims (5)

[Claims] 1. A workbench for an aerial work vehicle attached to a distal end of a telescopic boom provided on a vehicle so as to be able to swing up and down, the worktable bottom being connected to the distal end of the telescopic boom; A cylindrical worktable peripheral edge that extends upward and downward from the periphery of the worktable bottom, a ring-shaped worktable upper edge fixed to an upper periphery of the worktable peripheral edge, and One end is connected to the edge, the other end is fixed to the worktable bottom, and the worktable upper edge is moved up and down,
And a plurality of expansion / contraction operating means for extending or reducing the periphery of the worktable. 2. A workbench for an aerial work vehicle attached to a distal end portion of a telescopic boom provided on a vehicle so as to be able to swing up and down, and having a bottomed cylindrical shape connected to the distal end portion of the telescopic boom. A workbench bottom, and a cylindrical workbench upper part provided inside or outside the workbench bottom so as to be vertically movable inside or outside the workbench bottom, and a side wall inner surface of the workbench bottom or the work An engaging groove extending at least up and down is provided on at least one of the outer surfaces of the side walls of the table top, and the engaging groove is engaged with the other of the inner surface of the side wall of the work table bottom or the outer surface of the side wall of the work table upper part. A mating projection is provided, or an engaging groove extending at least vertically is provided on one of an outer surface of a side wall of the bottom of the worktable or an inner surface of a side wall of the upper part of the worktable, and an outer surface of a side wall of the worktable bottom or the upper part of the worktable Any of the inner surface of the side wall The other work is provided with an engagement protrusion that engages with the engagement groove, and the upper part of the worktable moves vertically along the engagement groove with which the engagement protrusion engages. Workbench. 3. The engaging groove includes an upper and lower groove extending in a vertical direction, a horizontal groove communicating with the upper and lower groove and extending in a horizontal direction, and an engaging groove extending downward in communication with the horizontal groove. The workbench for an aerial work vehicle according to claim 2, wherein the workbench upper portion is locked to the workbench bottom portion by locking the engagement protrusion into the lock groove. 4. The workbench according to claim 1, wherein the workbench is attached to a distal end of a telescopic boom provided on the vehicle so as to be able to swing up and down, and is stored at a predetermined position on the vehicle. A safety device for an aerial work vehicle, comprising: a workbench detecting means for detecting whether or not the height of the workbench is low; and detecting whether or not the vehicle is going to run. When the vehicle platform is detected by the platform detection unit to detect that the platform is not in a low state, and when the vehicle is enabled to travel by the vehicle platform detection unit. And a warning operation control means for performing a warning operation. 5. The workbench according to claim 1, wherein the workbench is attached to a distal end of a telescopic boom provided on the vehicle so as to be able to swing up and down, and is stored at a predetermined position on the vehicle. A workbench safety device having a plurality of jacks projecting laterally of the vehicle and stably supporting the vehicle body, wherein the workbench detects whether or not the height of the workbench is low. Detecting means, an operation detecting means for detecting an operation for changing the jack from a protruding state to a retracted state, and detecting that the height of the work table is not low by the work table detecting means, And an operation restricting means for restricting the operation of the jack and maintaining the jack in the extended state when an operation of changing the jack from the extended state to the retracted state is detected. Safety equipment for aerial work vehicles.