JP2010132379A - Cargo handling vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cargo handling vehicle capable of sufficiently reducing a working burden of an operator, and easy to be operated. <P>SOLUTION: A forklift 1 includes a unit 11 capable of rotating an operation seat 10 around the center C1 of rotation. The unit 11 includes: the operation seat 10; a steering member 24; various kinds of operation levers 36-38; various kinds of pedals 41-43; and a confirmation mirror 39. When the forward/backward operation switch lever 38 is switched to the backward operation, the unit 11 is displaced from a first position (reference to Fig.2(a)), in which the operation seat 10 is directed froward X1 of the vehicle, to a second position (reference to Fig.2(b)), in which the operation seat 10 is rotated at a predetermined rotation angle around the center C1 of rotation. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cargo handling vehicle.

In a cargo handling vehicle such as a forklift, there is a lifting / lowering operation lever of the cargo handling device on the right side of the driver seated on the driver's seat, and a steering handle (steering member) on the left side. Therefore, the driver operates the lifting operation lever with the right hand while holding the steering handle with the left hand.
Usually, in a forklift, since a cargo handling device is provided in the front part of the vehicle body, the forward view may be hindered by the loaded cargo. For this reason, there are many cases where the vehicle travels backward when transferring the load.

When the cargo handling vehicle travels backward, the driver holds the steering handle with his left hand, hangs his right arm on the upper part of the backrest of the driver's seat, and twists his upper body to the right so that his right shoulder is facing backward. Driving in a posture while viewing the back.
Thus, maintaining a tight driving posture with the upper body twisted for visual recognition in the rear is a heavy work burden for the driver.

On the other hand, forklifts have been proposed in which the driver's seat is turned around a turning axis spaced from the driver's seat, specifically, around a turning axis arranged at the position of the foot pedal (for example, (See Patent Document 1).
Japanese Patent Laid-Open No. 10-7395

However, when the driver's seat is turned about a turning axis that is separated from the driver's seat, the driver seated on the driver's seat receives a large inertial force by turning. Therefore, when the driver seat turns, the driver needs to maintain a posture against the inertial force. For this reason, reduction of a driver | operator's work burden is inadequate.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a cargo handling vehicle that can sufficiently reduce the work load on the driver and is easy to drive.

  In order to achieve the above object, according to the present invention, in a cargo handling vehicle (1) having a cargo handling device (3) having a stackable portion (17) that can be raised and lowered at a front portion of a vehicle body (2), a driver's seat (10) is provided. And a unit (11) rotatably supported by the vehicle body with the driver seat as a rotation center (C1), a drive mechanism (12) for rotating the unit around the rotation center, and predetermined conditions are satisfied. And a control unit (13) for controlling the drive mechanism so as to displace the unit to a required position around the center of rotation.

  In the present invention, since the direction of the unit including the driver seat can be changed, sufficient visibility can be ensured without the driver taking an unreasonable posture. In particular, since the unit is rotated about the driver's seat as the center of rotation, the rotational inertia experienced by the driver seated on the driver's seat when the unit is rotated can be significantly reduced. Therefore, the work burden on the driver can be sufficiently reduced. In the above description, “with the driver seat as the center of rotation” means “the center of rotation is disposed in the region where the driver seat is disposed in a plan view of the vehicle”.

  Further, the vehicle is provided with a reverse detection means (61) for detecting the reverse of the vehicle, and the control unit moves the unit to the front of the vehicle when the reverse detection of the vehicle is detected by the reverse detection means. The drive mechanism may be controlled so as to be displaced from a first position facing to a second position rotated by a predetermined rotation angle around the rotation center (claim 2). In this case, by moving the unit to the second position when the vehicle moves backward, the driver can easily visually recognize the rear of the vehicle without forcibly twisting the upper body. In addition, the rotational inertia experienced by the driver when displaced from the first position to the second position can be remarkably reduced, and the work burden on the driver can be sufficiently reduced.

  Further, the vehicle has forward detection means (61) for detecting the forward movement of the vehicle, and the control unit has the unit at the second position when the forward movement of the vehicle is detected by the forward movement detection means. In some cases, the drive mechanism is controlled to return the unit to the first position. In this case, when the vehicle moves backward after moving backward, the unit is returned to the first position where the driver seat faces the front of the vehicle, thereby ensuring visibility in the front in the traveling direction.

Further, there may be provided a lock mechanism (52) for locking the position of the unit (claim 4). In this case, since the orientation of the driver's seat is fixed by locking the position of the unit, the posture of the driver is stabilized, and maneuvering and vehicle driving operations are facilitated.
The unit includes at least one of a plurality of operation elements (24, 36, 37, 38, 41, 42, 43) and a confirmation mirror (39) for the driver to operate with hands or feet. There is a case (Claim 5). In this case, since the operation elements and the like are rotated and displaced together with the driver seat with the driver seat as the center of rotation, the ease of driving by the driver is significantly improved. The operating elements include a steering member such as a steering wheel, a lifting operation lever for raising and lowering the loading portion of the cargo handling device, a tilt operating lever for tilting the cargo handling device, and forward / reverse switching for switching forward / reverse of the vehicle. Examples include a lever, an accelerator pedal, a brake pedal, a clutch pedal, and various switches. The steering member, various levers, and various switches are operated by hand, and the accelerator pedal, the brake pedal, and the clutch pedal are operated by feet. The confirmation mirror is a mirror mainly for confirming the rear side.

  The unit includes a steering member (24), and the mechanical connection between the steering member and the steered wheel (6) may be broken (claim 6). In this case, when the position of the unit is changed, the driver can easily operate the steering member. Further, since the mechanical connection between the steering member and the steered wheels is broken, there is no difficulty in rotating the steering member together with the driver seat.

  In the above description, the alphanumeric characters in parentheses represent reference numerals of corresponding components in the embodiments described later, but the scope of the claims is not limited by these reference numerals.

A preferred embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic side view showing a schematic configuration of a forklift as a cargo handling vehicle according to an embodiment of the present invention.
Referring to FIG. 1, a forklift 1 includes a vehicle body 2, a cargo handling device 3 provided at a front portion of the vehicle body 2, a counterweight 4 provided at a rear portion of the vehicle body 2, and a driving wheel that supports the vehicle body 2. As a front wheel 5 and a rear wheel 6 as a steered wheel, a drive source 7 for a vehicle including an engine, a hydraulic pump 8 as a hydraulic source, and a steering device 9 for steering the rear wheel 6. Yes.

  The forklift 1 includes a driver seat 10 and is supported by a vehicle body 2 so as to be rotatable around a vertical rotation center C1, and a unit drive mechanism 12 that rotates the unit 11 around the rotation center C1. And an ECU (electronic control unit) 13 as a control unit for controlling the unit drive mechanism 12. The ECU incorporates various interfaces and various drivers in addition to the CPU, ROM and RAM constituting the microcomputer.

Although not shown, the power of the drive source 7 such as an engine is transmitted to a transmission that performs forward / reverse switching and a shift operation via a torque converter, and further transmitted to left and right front wheels 5 (drive wheels) via a differential. It has become so. The transmission includes a forward clutch and a reverse clutch.
The cargo handling device 3 is lifted and lowered by a pair of left and right outer masts 14 supported by the vehicle body 2 so as to be tiltable about a lower end portion 14 a, an inner mast 15 supported by the outer mast 14 so as to be movable up and down, and the outer mast 14. The lift bracket 16 is supported so that it can be supported, and a pair of left and right forks 17 are attached to the lift bracket 16 and serve as a loading portion for loading a load.

  A tilt cylinder 18 is interposed between a predetermined portion of the outer mast 14 and a predetermined portion of the vehicle body 2. The tilt cylinder 18 includes a cylinder body 19 having one end that is swingably connected to a predetermined portion of the vehicle body 2, and a rod 20 that protrudes from the other end of the cylinder body 19. The tip of the rod 20 is slidably connected to a predetermined portion of the outer mast 14. As the rod 20 of the tilt cylinder 18 extends and contracts, the outer mast 14 is displaced into an upright posture and a tilted posture.

  Further, a lift cylinder 21 is provided for raising and lowering the inner mast 15 using the outer mast 14 as a guide. The lift cylinder 21 has a cylinder body 22 fixed to the outer mast 14 and a rod 23 protruding from the cylinder body 22. The tip of the rod 23 is fixed to a mounting portion 15 a provided at a predetermined portion of the inner mast 15.

The steering device 9 is configured as a so-called steer-by-wire type steering device in which the mechanical connection between the steering member 24 that is a handwheel with a knob and the rear wheel 6 that is a steered wheel is cut off. As a steered wheel, a single rear wheel 6 may be provided at the center in the left-right direction of the vehicle body 2, or the rear wheels 6 may be provided on the left and right sides of the vehicle body 2, respectively.
The steering device 9 includes a steering actuator 25 made of, for example, an electric motor for turning the rear wheel 6, a reaction force actuator 26 made of, for example, an electric motor for applying a steering reaction force to the steering member 24, and steering of the steering member 24. A steering angle sensor 27 for detecting the angle and a turning angle sensor 28 for detecting the turning angle of the rear wheel 6 are provided.

The rear wheel 6 as a steered wheel is rotatably supported by a substantially vertical support member 29. The support member 29 is supported through a bearing 30 held by the vehicle body 2 so as to be rotatable about a substantially vertical rotation axis C2.
The rotation of the output shaft of the steering actuator 25 is decelerated via the transmission mechanism 31 and transmitted to the support member 29. The transmission mechanism 31 is provided such that a drive member 32 made of, for example, a drive gear that rotates along with the output shaft of the steering actuator 25, and a support member 29 that can rotate along the rotation axis C2, and meshes with the drive gear. For example, it has the driven member 33 which consists of driven gears.

The unit 11 includes a unit main body 34 placed on the vehicle body 2. An operation stand 35 is provided at the front part of the unit body 34, and the driver seat 10 is fixed to the rear part of the unit body 34. The driver's seat 10 has a seat portion 10a and a backrest portion 10b.
The operation stand 35 includes a plurality of operation elements 24 for a driver to operate by hand, the operation member 24, an elevating operation lever 36 for elevating the fork 17, and a tilt for swinging the outer mast 14. An operation lever 37 and a forward / reverse switching lever 38 are provided. In addition, a confirmation mirror 39 for mainly confirming the rear side is fixed to the operation stand 35. The operation stand 35 is provided with various switches not shown.

  In the vicinity of the base of the operation stand 35, an accelerator pedal 41, a brake pedal 42, and a clutch pedal 43 are provided on the bottom 40 of the unit body 34 as a plurality of operation elements for the driver to operate with his / her feet. Yes. The accelerator pedal 41, the brake pedal 42, and the clutch pedal 43 are actually arranged side by side in a direction perpendicular to the paper surface (corresponding to the left-right direction of the vehicle), but are schematically shown in FIG.

One or a plurality of rolling members 44 are interposed between the bottom 40 of the unit main body 34 and the vehicle body 2, and when the unit 11 rotates with the driver seat 10 as the rotation center C <b> 1, smooth with a small driving force. It can be rotated.
Here, “with the driver's seat 10 as the rotation center C1” means “the rotation center C1 is disposed in a region where the driver's seat 10 is disposed in a plan view of the vehicle”. The rotation center C1 is preferably arranged in the region of the seat 10a of the driver's seat 10, and more preferably in the region of the seat 10a that supports the driver's buttocks.

A support shaft 45 that rotates along with the unit 11 protrudes downward from the unit main body 34 of the unit 11, and the support shaft 45 is rotatably supported by a bearing 46 held by the vehicle body 2. The center axis of the support shaft 45 coincides with the rotation center C1.
The unit driving mechanism 12 for driving the unit 11 around the rotation center C1 reduces the rotation of the output shaft of the unit rotation actuator 47, which is an electric motor, and the unit rotation actuator 47, for example, to the unit 11. And a transmission mechanism 48 for transmission.

The transmission mechanism 48 is provided so that it can rotate with the output shaft of the unit rotation actuator 47, for example, a drive member 49 made of a drive gear, and the support shaft 45 can rotate with the rotation center C1. And a driven member 50 formed of, for example, a driven gear that meshes with the drive gear.
With the function of the unit drive mechanism 12, the unit 11 has a first position where the driver's seat 10 faces the vehicle front X1 as shown in FIG. 2A, and the first position as shown in FIG. 2B. The second position is rotated clockwise by a predetermined rotation angle around the rotation center C1.

2 (a) and 2 (b), the layout of the raising / lowering operation lever 36, the tilt operation lever 37, the forward / reverse switching lever 38, the accelerator pedal 41, the brake pedal 42, and the clutch pedal 43 as operating elements is as follows. It is shown schematically.
Referring to FIG. 1 again, a unit rotation position sensor 51 for detecting the rotation position of the unit 11 around the rotation center C1 with respect to the vehicle body 2 is provided. The unit rotational position sensor 51 is disposed, for example, at the opposing portion of the vehicle body 2 and the unit main body 34. Specifically, it has a fixed portion 51a fixed to the vehicle body 2 and a movable portion 51b attached to the unit main body 34 so as to be able to move along with the fixed portion 51a.

  Further, the forklift 1 includes a lock mechanism 52 for locking the unit main body 34 to the first position and the second position with respect to the vehicle body 2. The lock mechanism 52 includes a lock member 53. The lock member 53 includes a main body 53a fixed to the vehicle body 2 and a lock shaft 53b that expands and contracts by the action of a lock mechanism solenoid built in the main body 53a. I have.

  As shown in FIG. 3, the lock mechanism 52 includes a first lock hole 54 and a second lock hole 55 that are engaged with the lock shaft 53 b on the lower surface of the unit main body 34. When the lock shaft 53b is fitted into the first lock hole 54, the unit 11 is locked in the first position, and when the lock shaft 53b is fitted into the second lock hole 55, the unit 11 is Locked in the second position.

  Referring to FIG. 4 which conceptually shows the principle of the operation of raising and lowering the fork 17, a sprocket 56 is rotatably supported on the upper portion of the inner mast 15, and a chain 57 is wound around the sprocket 56. It has been. One end 57 a of the chain 57 is fixed to a fixing portion 14 b provided on the outer mast 14, and the other end 57 b of the chain 57 is fixed to the lift bracket 16. Thereby, the lift bracket 16 and the fork 17 are suspended using the chain 57.

  When the inner mast 15 rises with the extension of the rod 23 of the lift cylinder 21, the sprocket 56 rises with respect to the fixed portion 14 b of the outer mast 14, and the lift bracket 16 and the fork as the loading portion are connected via the chain 57. Raise 17 The amount of rise of the fork 17 relative to the ground surface is twice the amount of extension of the rod 23 of the lift cylinder 21.

  FIG. 5 is a block diagram showing the main electrical configuration of the forklift 1. Referring to FIG. 5, the ECU 13 includes a steering angle sensor 27, a turning angle sensor 28, a vehicle speed sensor 58, a unit rotation position sensor 51, a lift operation lever position sensor 59 that detects the position of the lift operation lever 36, a tilt operation. Signals are input from a tilt operation lever position sensor 60 that detects the position of the lever 37 and a forward / reverse switching switch 61 that operates in response to switching of the forward / reverse switching lever 38.

  The ECU 13 includes a steering actuator 25, a reaction force actuator 26, a unit rotation actuator 47, a lock mechanism solenoid 62, and an electromagnetic proportional control valve that controls the supply of hydraulic oil from the hydraulic pump 8 to the lift cylinder 21. The lift control valve 63, the tilt control valve 64 comprising an electromagnetic proportional control valve for controlling the supply of hydraulic oil from the hydraulic pump 8 to the tilt cylinder 18, and the hydraulic cylinder for engaging / disengaging the forward clutch. A forward clutch control valve 65 comprising an electromagnetic proportional control valve for controlling the supply of oil, and a reverse clutch comprising an electromagnetic proportional control valve for controlling the supply of hydraulic oil to a hydraulic cylinder for engaging / disengaging the reverse clutch A signal is output to each of the control valves 66 for use.

The ECU 13 executes various controls. For example, the ECU 13 determines a target turning angle based on the steering angle input from the steering angle sensor 27 and the vehicle speed input from the vehicle speed sensor 58, and uses the turning angle input from the turning angle sensor 28 as the target turning angle. The steering actuator 25 is drive-controlled (that is, steering control is performed) so that
Further, the ECU 13 is inputted from the steering angle and vehicle speed sensor 58 inputted from the steering angle sensor 27 so that the reaction force actuator 26 generates torque for giving the steering reaction force corresponding to the road surface reaction force to the steering member 24. The reaction force actuator 26 is driven and controlled based on the vehicle speed (that is, reaction force control is performed).

Further, the ECU 13 sends a control signal to the lift control valve 63 that controls the supply of hydraulic oil from the hydraulic pump 8 to the lift cylinder 21 in accordance with the position of the lift control lever 36 input from the lift control lever position sensor 59. Output.
Further, the ECU 13 sends a control signal to the tilt control valve 64 that controls the supply of hydraulic oil from the hydraulic pump 8 to the tilt cylinder 18 in accordance with the position of the tilt operation lever 37 input from the tilt operation lever position sensor 60. Output.

In addition, the ECU 13 outputs a control signal to the forward clutch control valve 65 in response to the forward / reverse switching switch 61 being switched to forward, and the hydraulic pump for operating the forward clutch is operated from the hydraulic pump 8. Allow oil to be supplied.
Further, the ECU 13 outputs a control signal to the reverse clutch control valve 66 in response to the forward / reverse switching switch 61 being switched to the reverse, and the hydraulic cylinder for operating the reverse clutch is operated from the hydraulic pump 8. Allow oil to be supplied.

  FIG. 6 is a flowchart showing the main operation of the ECU 13. Referring to FIG. 6, in step S1, a signal from forward / reverse switching switch 61 is input, and in step S2, it is determined whether or not reverse switching is performed. If reverse switching is detected in step S2 (YES in step S2), a signal from the unit rotation position sensor 51 is input in step S3, and the unit 11 is moved to the first position in step S4. It is determined whether or not the driver's seat 10 is at the position of the unit 11 facing the vehicle front X1.

  On the condition that it is determined as YES in Step S4 (that is, the unit 11 is in the first position), the unit 11 is moved to the second position. Specifically, after releasing the lock on the unit 11 by the lock mechanism 52 in step S5, the unit rotation actuator 47 is driven in step S6 to move the unit 11 to the second position. Thereafter, in step S7, the unit 11 is locked at the second position.

  On the other hand, when reverse switching is not detected in step S2 (in the case of NO in step S2), it is determined in step S8 whether forward switching is performed. If forward switching is detected in step S8 (YES in step S8), a signal from the unit rotation position sensor 51 is input in step S9, and the unit 11 is moved to the second position in step S10. It is determined whether or not there is.

  On the condition that it is determined as YES in Step S10 (that is, the unit 11 is in the second position), the unit 11 is moved to the first position. Specifically, after the lock of the unit 11 by the lock mechanism 52 is released in step S11, the unit rotation actuator 47 is driven to move the unit 11 to the first position in step S12. Thereafter, in step S13, the unit 11 is locked at the first position.

  According to the present embodiment, since the direction of the unit 11 including the driver seat 10 can be changed, sufficient visibility can be ensured without the driver taking an unreasonable posture. In particular, since the unit 11 is rotated with the driver seat 10 as the rotation center C1, the rotational inertia received by the driver sitting on the driver seat 10 when the unit 11 rotates can be significantly reduced. Therefore, the work burden on the driver can be sufficiently reduced.

  Further, when the backward movement of the vehicle is detected, the unit 11 is rotated by a predetermined angle from the first position (see FIG. 2A) where the driver seat 10 of the unit 11 faces the vehicle front X1. Since it is displaced to the position (see FIG. 2B), the driver can easily visually recognize the rear of the vehicle without forcibly twisting the upper body. In addition, the rotational inertia experienced by the driver when displaced from the first position to the second position can be significantly reduced, and the driver's work load can be sufficiently reduced to reduce the driver's fatigue. can do.

Further, the detection of the backward movement of the vehicle is performed based on the forward / reverse switching switch 61 connected to the forward / reverse switching lever 38. That is, before the vehicle starts to move backward, the switch to the backward movement is detected and the unit 11 is moved to the second position. Therefore, the backward movement can be started after sufficiently increasing the visibility to the rear. . From this point, the driver's fatigue can be reduced.
Further, when the vehicle 11 moves backward after moving backward, the unit 11 is returned to the first position where the driver's seat 10 faces the vehicle front X1, thereby ensuring forward visibility in the traveling direction.

Further, the unit 11 can be locked in the first position and the second position by the lock mechanism 52. Since the direction of the driver's seat 10 is fixed by locking the position of the unit 11, the posture of the driver is stabilized, and it becomes easy to perform steering and vehicle driving operations.
The unit 11 includes a plurality of operation elements and a confirmation mirror 39 for the driver to operate with hands or feet. Specifically, a steering member 24, a lift operation lever 36, a tilt operation lever 37, a forward / reverse switching lever 38, an accelerator pedal 41, a brake pedal 42, a clutch pedal 43, and a confirmation mirror 39 are included. Therefore, since these operation elements and the like are rotationally displaced together with the driver seat 10 with the driver seat 10 as the rotation center C1, the ease of driving by the driver is remarkably improved.

  In addition, the steering member 24 is included in the unit 11, and a steer-by-wire type steering device in which the mechanical connection between the steering member 24 and the rear wheel 6 as a steered wheel is cut off is used as the steering device 9. Since it is adopted, the driver can easily operate the steering member 24 when the position of the unit 11 is changed. Further, since the mechanical connection between the steering member 24 and the rear wheel 6 as the steered wheel is broken, there is no difficulty in rotating the steering member 24 together with the driver seat 10.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the unit 11 includes the steering member 24, the lift operation lever 36, the tilt operation lever 37, the forward / reverse switching lever 38, the accelerator pedal. 41, the brake pedal 42, the clutch pedal 43, and the confirmation mirror 39 are included. However, the present invention is not limited to this, and the unit 11 only needs to include at least the driver's seat 10. In addition, various modifications can be made within the scope of the claims of the present invention.

It is a typical side view showing a schematic structure of a forklift as a cargo handling vehicle of an embodiment of the present invention. It is a typical top view of a forklift explaining rotation movement of a unit. (A) shows a state where the unit is in the first position, and (b) shows a state where the unit is in the second position. It is a schematic bottom view of the unit main body of a unit. It is the schematic explaining the operation principle which raises / lowers a fork. It is a block diagram which shows the electric constitution of a forklift. It is a flowchart which shows the flow of the main control by ECU.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Forklift (loading vehicle), 2 ... Vehicle body, 3 ... Loading / unloading device, 4 ... Canta weight, 5 ... Front wheel (drive wheel), 6 ... Rear wheel (steered wheel), 7 ... Drive source, 8 ... Hydraulic pump, DESCRIPTION OF SYMBOLS 9 ... Steering device, 10 ... Driver seat, 11 ... Unit, 12 ... Unit drive mechanism, 13 ... ECU (control part), 17 ... Fork (loading part), 18 ... Tilt cylinder, 21 ... Lift cylinder, 24 ... Steering member , 25 ... Steering actuator, 26 ... Reaction force actuator, 27 ... Steering angle sensor, 28 ... Steering angle sensor, 29 ... Support member, 30 ... Bearing, 31 ... Transmission mechanism, 34 ... Unit body, 35 ... Operation stand, 36 ... Lifting lever (operating element), 37 ... Tilt operating lever (operating element), 38 ... Forward / reverse switching lever (operating element), 39 ... Confirmation mirror, 41 ... Accelerator pedal (operating element), 4 ... Brake pedal (operation element), 43 ... Clutch pedal (operation element), 44 ... Rolling member, 45 ... Support shaft, 46 ... Bearing, 47 ... Actuator for unit rotation, 48 ... Transmission mechanism, 51 ... Unit rotation position sensor 52 ... Lock mechanism, 53 ... Lock member, 53a ... Main body, 53b ... Lock shaft, 54 ... First lock hole, 55 ... Second lock hole, 61 ... Forward / reverse switching switch (reverse detection means, forward detection means) Means), 62 ... solenoid for locking mechanism, C1 ... center of rotation, X1 ... forward of the vehicle

Claims (6)

In a cargo handling vehicle provided with a cargo handling device having a loadable portion at the front of a vehicle body,
A unit that includes a driver seat and is rotatably supported by the vehicle body about the driver seat as a rotation center;
A drive mechanism for rotating the unit around the rotation center;
A cargo handling vehicle comprising: a control unit that controls the drive mechanism so as to displace the unit to a required position around the rotation center when a predetermined condition is satisfied. In claim 1, comprising a reverse detection means for detecting the reverse of the vehicle,
When the reverse detection of the vehicle is detected by the reverse detection means, the control unit rotates the unit by a predetermined rotation angle around the rotation center from the first position where the driver seat faces the front of the vehicle. A cargo handling vehicle that controls the drive mechanism so as to be displaced to a second position. The vehicle according to claim 2, further comprising advance detection means for detecting advance of the vehicle,
The control unit is configured to return the unit to the first position on the condition that the unit is at the second position when the forward movement of the vehicle is detected by the advance detection unit. A cargo handling vehicle characterized by controlling the vehicle.   4. The cargo handling vehicle according to claim 1, further comprising a lock mechanism that locks the position of the unit.   5. The cargo handling vehicle according to claim 1, wherein the unit includes at least one of a plurality of operation elements and a confirmation mirror for a driver to operate with hands or feet.   The cargo handling vehicle according to any one of claims 1 to 4, wherein the unit includes a steering member, and mechanical connection between the steering member and the steered wheels is broken.

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