JPH072399U - Work platform storage and holding device for aerial work platforms - Google Patents

Abstract

(57) [Abstract] [Purpose] A high place where a worker can lock and release the lock at the retracted position of the workbench according to the operation of the work device without locking the workbench. Obtain a workbench storage and holding device for a work vehicle. [Structure] The fixed lock member 22 provided on the workbench mounting bracket 12 and the movable lock member 22 provided on the vertical post 13 can be locked and held when the workbench 11 is in the retracted state. Further, a drive take-out means (PTO) for driving the drive source P of the work device such as the boom 16;
And a detection means for detecting the operation of the PTO. When the detecting means detects that the PTO is turned off while the workbench 11 is in the retracted state, the lock operating means locks the movable lock member, and when the PTO is turned on, the lock releasing operation is performed. Therefore, it is not necessary for the worker to perform the lock operation and the unlock operation at the start and end of the work.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an aerial work vehicle having a swingable work platform at the tip of a boom, and moreover, a work platform storage of a work platform capable of holding the work platform in a predetermined storage position. Regarding the device.

[0002]

[Prior art]

 In an aerial work vehicle in which a boom that can be expanded and contracted and raised and lowered is installed on the vehicle body, and a work platform is installed at the tip of this boom, the work platform can be operated at any time by elevating and extending the boom during work. Move to the position to work. In order to improve workability, the workbench has a mechanism that turns to the left and right. When the work is not performed, the boom is laid down and retracted and stored together with the workbench on the vehicle body.

Here, in such a conventional aerial work vehicle, a boom is disposed on the vehicle body so as to be capable of turning and undulating freely, and a vertical end that is always held vertically by a leveling mechanism is provided at the tip of the boom. A post is provided. A workbench is attached to the vertical post so that it can freely swing around the vertical post. This turning is carried out by the movement of the motor and worm gear or spur gear, etc., provided on the worktable at the pivotal connection between the vertical post and the worktable. In addition, when retracting the boom, the boom is reduced and recoiled, and the workbench is swung to the retracted position (the position where the workbench fits on the vehicle body when the boom is stored on the vehicle body). It is carried out by placing a workbench on.

In such an aerial work vehicle, when the work vehicle is caused to travel with the boom stored, the work platform turns due to vibration and inertial force during traveling, contrary to the resistance force of the motor and gear, The workbench may protrude from the vehicle body. In this case, in an aerial work vehicle in which the base end of the boom is arranged in the front part of the vehicle body, the boom is laid down behind the vehicle body so that the workbench is placed on the rear part of the vehicle body. Is often stored. In such an aerial work vehicle, when the work platform in the retracted state turns and projects to the rear of the vehicle body, it is difficult for the driver to confirm this projection, and it is necessary to move the vehicle backward while the work platform is projected. The platform may come into contact with and damage the obstacles.

[0005]

[Problems to be solved by the device]

 Therefore, in order to prevent the workbench from rotating in the retracted state, there is an aerial work vehicle equipped with a lock mechanism that holds the workbench in the retracted position by locking the vertical post and the workbench. In such an aerial work vehicle, the lock mechanism is often configured to be manually operated by the operator, and the operator turns the work table without releasing the lock. There are cases. In such a case, there has been a problem that the swing mechanism such as a motor for performing the swing operation of the work table may be damaged or the lock mechanism may be damaged. There is also a problem that if the worker runs the aerial work vehicle without locking the work platform, the work platform may be damaged as described above.

The present invention has been made in view of such a problem, and in accordance with the operation of the work device without the operator performing the rocking operation of the workbench, the workbench can be stored at the retracted position. It is an object of the present invention to provide a workbench storage / holding device for an aerial work vehicle capable of holding a lock and releasing a lock.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, in the workbench storage / holding device of the present invention, a workbench is pivotably attached to a vertical post provided at the tip of a boom, and the workbench is provided on either the workbench or the vertical post. The fixed lock member and the movable lock member provided on the other of the worktable and the vertical post are configured to be locked when the worktable is in the retracted state. Further, it is provided with a drive take-out means for taking out a driving force from the drive means for driving the drive source of the work device such as a boom, and a detecting means for detecting the operation of the drive take-out means. Then, when the detection means detects the operation of the drive take-out means, the lock operation means performs the lock operation and the lock release operation of the movable lock member.

[0008]

[Action]

 In a workbench storage and holding device for aerial work vehicles equipped with such mechanisms, when storing a boom with a workbench at the front end, the workbench is swung to the storage position and the drive take-out means is turned off. When operated, the fixed lock member and the movable lock member are locked, and the worktable is locked and held in the retracted position. Also, when the drive take-out means is turned on to operate a work device such as a boom, the lock is released. For this reason, the worker does not perform the locking operation and the unlocking operation, and the work platform does not rotate even when the work vehicle travels in the retracted state, and the swing mechanism or the lock mechanism of the work platform is damaged when the work platform swings. There is nothing to do.

[0009]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, an aerial work vehicle equipped with a workbench storage holding device according to the present invention will be described with reference to FIGS. 1 and 3. In the aerial work vehicle 1, a swivel base 20 which is capable of swiveling with respect to the vehicle body 17 is disposed in a front portion of the vehicle body 17. The base end of the boom 16 is pivotally attached to the upper part of the swivel base 20. The boom 16 is composed of three stages of boom members and is telescopically (nested) telescopically configured, and can be hoisted and retracted by a hoisting cylinder 19 provided between the boom 16 and the swivel base 20. is there.

A vertical post 13 that is always held vertically by a leveling mechanism (not shown) is provided at the tip of the boom 16. A workbench mounting bracket 12 is pivotally attached to the vertical post 13 so that the workbench 11 can be freely swiveled around the vertical post 13 because the workbench 11 is attached to the workbench mounting bracket 12. can do. This turning is performed at a pivotal portion between the vertical post 13 and the workbench mounting bracket 12 by a hydraulically driven motor (not shown) and a worm gear (not shown) provided in the vertical post 13 or on the workbench mounting bracket 12. Is performed by the operation of.

Further, in order to prevent interference between the workbench 11 and the boom 16 during turning, a stopper (not shown) is provided at the left and right turning limit points (points at which the workbench and the boom interfere with each other when further turning). Is provided. When the boom 16 is not used, the workbench 11 is swung to the stowed position (the position swung to the swivel limit point), and the boom 16 is contracted and laid down (indicated by a chain line in FIG. 1). (State), the workbench 11 is placed in the workbench storage space 18 of the vehicle body 17.

Each operation of the boom 16 including the swiveling operation of the swivel base 20 and the workbench is performed by the operation of a hydraulic actuator such as a hydraulic telescopic cylinder including the undulating cylinder 19 and a hydraulic motor. A hydraulic pump P mounted on the vehicle body 17 supplies the hydraulic oil. This hydraulic pump P uses a power take-off mechanism (drive take-out means) PTO to take the output of a traveling engine (drive means) E that drives rear wheels 23 via a transmission TM when the aerial work vehicle 1 is running. Driven by taking out. Here, the appropriate rotation speed of the engine E when driving the hydraulic pump P is about 1500 rpm, and further increase of the rotation speed of the engine E may adversely affect the speed reducer body of the power take-off mechanism PTO. . Therefore, in order to stop the operation of the power take-off mechanism PTO when the engine E rotates at a high speed, such as when the aerial work vehicle 1 is traveling, a power take-off mechanism operation switch 15 for turning on and off the power take-off mechanism PTO is provided. ing.

In the aerial work vehicle 1 configured as described above, when the aerial work vehicle 1 is caused to travel after the boom 16 has been retracted, the work platform 11 is moved due to vibration and inertial force during traveling. There is a possibility that the workbench 11 may protrude from the vehicle body 17 by turning in the direction opposite to the storage position. Therefore, the storage position of the workbench 11 is held by the workbench storage holding device according to the present invention.

Here, the workbench storage holding device according to the present invention will be described with reference to FIG. A solenoid (lock actuating means) 21 is provided on the side surface of the vertical post 13. The solenoid 21 has a solenoid pin that projects above the solenoid 21 when not excited and is stored in the solenoid 21 when excited. A (movable lock member) 21a is provided. Further, a fixed lock member 22 into which the solenoid pin 21a can be fitted when the workbench 11 is in the retracted position is provided on the side surface of the workbench mounting bracket 12 on the solenoid 21 side.

The fixed lock member 22 is formed of a plate material having a through hole 22 a near the center thereof, and is attached so that the lower surface is located above the solenoid 21 when the workbench 11 is in the retracted position. There is. Then, when the solenoid pin 21a projects at the storage position of the workbench 11, the workbench 11 is locked and held at the storage position without turning by fitting the solenoid pin 21a and the through hole 22a. Has been done.

The solenoid 21 is excited by being supplied with electric power from the battery B provided in the vehicle body 17, and the supply of this electric power is interlocked by turning on the power take-off mechanism operation switch 15. The controller 24 controls the detection signal from the contact (detection means) 14 that is turned on by the controller 24. As a result, when the power take-off mechanism PTO is turned on, the solenoid 21 is excited and the solenoid pin 21a is stored in the solenoid 21.

In the aerial work vehicle 1 configured as described above, when the boom 16 is stored, the boom 16 is contracted and laid down, and the work platform 11 is contacted with the stopper provided at the turning limit point. Turn. Here, the turning position becomes the storage position of the workbench 11, and the position where the fixed lock member 22 and the solenoid pin 21a can be fitted. When the power take-off mechanism operation switch 15 is turned off, the solenoid 21 is de-energized and the solenoid pin 21a is projected, so that the workbench 11 stored in the workbench storage space 18 is stored at the storage position. You can hold the lock with.

Further, when the work vehicle 1 is moved to the work position for work, the boom 16 is raised and extended, and the workbench 11 is swung, so that the power take-off mechanism is operated. The power take-off mechanism P TO is activated by turning on the switch 15. When the power take-off mechanism operation switch 15 is turned on, the contact 14 is also turned on. For this reason, when the solenoid 21 is excited by the electric power being supplied to the solenoid 21 and the solenoid pin 21a is retracted, the work table 11 is released from the lock holding state, and the work table 11 is held against the vertical post 13. You can freely turn.

In the workbench storage / holding device for an aerial work vehicle constructed as described above, the power take-off mechanism PTO is turned off during traveling, so that the operator does not perform the lock operation of the turning mechanism of the workbench. Also, the storage state of the workbench 11 can be locked and held at the same time when the power take-off mechanism PTO is turned off. This prevents the work platform 11 from protruding from the vehicle body 17 due to vibration or the like during traveling when the aerial work vehicle 1 is caused to travel. In addition, when it is necessary to perform a boom operation or a swing of the workbench to perform work, the power take-off mechanism PTO can be turned on and the locked state of the retracted state of the workbench 11 can be released at the same time. For this reason, the worker does not rotate the work table without releasing the lock holding, and the rotation mechanism of the work table is not damaged or the lock mechanism is not damaged, and the work table 11 is set at an arbitrary work position. You can move.

In the above embodiment, the solenoid for holding the lock of the workbench is provided on the vertical post side, and the fixed lock member is provided on the workbench side. However, the solenoid is provided on the workbench side, A fixed locking member may be provided on the vertical post side. In the above embodiment, the workbench is held locked by the solenoid pin and the through hole provided in the fixed lock member, but the workbench storage holding device according to the present invention is not limited to this. Instead, the workbench and the vertical post may be locked and held by using a fixed hook and a movable hook or the like.

[0021]

[Effect of device]

 As described above, in the work platform storage / holding device for an aerial work vehicle according to the present invention, the fixed lock member provided on one of the work platform and the vertical post and the other of the work platform and the vertical post are provided. The movable lock member can be locked when the workbench is in the retracted state. Further, it is provided with a drive take-out means for driving a drive source of a work device such as a boom, and a detecting means for detecting an operation of the drive take-out means. Then, when the detection means detects the operation of the drive take-out means, the lock operation means performs the lock operation and the lock release operation of the movable lock member.

That is, when the detection means detects that the drive take-out means is turned off while the workbench is in the retracted state, the lock actuating means locks the movable lock member, and when the drive take-out means is turned on. Perform the unlock operation. Therefore, it is not necessary for the operator to manually perform the lock operation and the lock release operation of the rotating mechanism of the workbench. Therefore, it is possible to improve the operability of the work device during work, and prevent damage to the workbench, turning mechanism, lock mechanism, etc. caused by the worker forgetting to perform the lock operation and the unlock operation. Therefore, it is possible to improve safety.

[Brief description of drawings]

FIG. 1 is a perspective view of an aerial work vehicle including a workbench storage and holding device according to the present invention.

FIG. 2 is a perspective view of a lock mechanism of the workbench storage holding device.

FIG. 3 is a block diagram showing the workbench storage holding device.

[Explanation of symbols]

 1 aerial work vehicle 11 workbench 12 workbench mounting bracket 13 vertical post 16 boom 17 vehicle body 18 workbench storage space 21 solenoid (lock actuating means) 21a solenoid pin (movable lock member) PTO power take-off mechanism (drive take-out means)

Claims (1)

[Scope of utility model registration request] 1. A boom in which an operation such as ups and downs is freely arranged on a vehicle body, a vertical post provided at a tip of the boom, a workbench pivotally attached to the vertical post, A fixed lock member provided on one of the workbench and the vertical post, and a movable lockable member provided on the other of the workbench and the vertical post so as to be locked with the fixed lock member when the workbench is stored. A lock member, a drive unit that drives a drive source of a work device including at least the boom, a drive extraction unit that extracts a drive force from the drive unit to drive the drive source, and a drive force that is generated by the drive extraction unit. Detection means for detecting that the movable lock member is taken out, and lock operation means for performing lock operation and unlock operation of the movable lock member based on a detection signal from the detection means. It is composed of worktable storage holding device Aerial according to claim.