JP6436047B2 - Display device - Google Patents

Description

  The present invention relates to a display device mounted on an industrial vehicle.

  As an industrial vehicle which made the operator visually recognize the advancing direction, it is described in patent document 1, for example. The industrial vehicle described in Patent Literature 1 includes a display unit that displays the traveling direction of the industrial vehicle. The display unit includes a symbol indicating an industrial vehicle and a plurality of LEDs arranged so as to surround the symbol. When the industrial vehicle travels, the LED corresponding to the traveling direction of the industrial vehicle is turned on, so that the traveling direction of the industrial vehicle can be visually recognized by the operator.

JP 2002-274798 A

  By the way, an industrial vehicle that travels within a limited space, such as a reach-type forklift, may have a plurality of travel modes with different moving directions. Examples of the mode include a standard mode for moving back and forth and a lateral movement mode for moving left and right. However, in a display device mounted on an industrial vehicle, the display does not correspond to the change even when the mode is changed. For this reason, when turning a corner in the lateral movement mode, the display cannot be referred to and the operability may be deteriorated, so that a preferable display is desired.

  An object of the present invention is to provide a display device capable of performing display suitable for a mode.

  A display device that solves the above-mentioned problems can be set in a lateral movement mode for moving left and right in addition to a standard mode for moving back and forth, and is mounted on an industrial vehicle that can travel while steering in a selected traveling direction. In the display device, the current traveling direction, the current steering direction, and a steerable range corresponding to the mode with respect to the current steering direction are displayed on the display unit.

  According to this, since the steerable range is displayed on the display unit, the extent from the current steering direction to the limit within the steerable range is determined based on the current traveling direction and the current steering direction. It is possible for the operator to visually recognize whether or not steering can be performed. Since the steerable range changes depending on the mode, the operator can visually recognize how much steering can be performed up to the limit within the steerable range even when the mode is changed. That is, when trying to turn a corner, a display suitable for the mode can be performed.

  In the display device, a steerable range on the opposite side to the current traveling direction may be displayed on the display unit when the lateral movement mode is set. According to this, at the time of setting the lateral movement mode, the operator can also visually recognize the steerable range on the opposite side to the current traveling direction.

  About the said display apparatus, you may display the instruction | indication content with respect to the operation direction in the direction lever which is an operation member for selecting the advancing direction on the said display part. According to this, the operator can visually recognize the correspondence between the direction of operation of the direction lever and the direction of travel of the industrial vehicle.

  According to the present invention, display suitable for a mode can be performed.

The schematic side view which shows a reach type forklift. The perspective view which fractures | ruptures and shows a part of reach type forklift. The block diagram which shows the electric constitution of a reach type forklift. (A) is a schematic diagram showing the direction of each wheel of a reach-type forklift when neutral in the standard mode, (b) is a schematic diagram showing the display content of the display when moving forward in the standard mode, and (c) is a standard mode Schematic which shows the display content of the display at the time of reverse drive in. (A) is the schematic which shows direction of each wheel of the reach type forklift at the time of steering in standard mode, (b) is the schematic which shows the display content of the display at the time of steering in standard mode. (A) is the schematic which shows direction of each wheel of a reach type forklift when progressing to the left in lateral movement mode, (b) is the schematic which shows the display content of the display in lateral movement mode. (A) is a schematic diagram showing the direction of each wheel of a reach-type forklift during steering in the lateral movement mode, and (b) is a schematic diagram showing the display content of the display when traveling in the left direction and steering in the lateral movement mode. (C) is the schematic which shows the display content of the display at the time of advancing and steering in the right direction in lateral movement mode. (A) And (b) is the schematic which shows the modification of the display content of a display. Schematic which shows the modification of the display content of a display.

  Hereinafter, an embodiment of the display device will be described. The display device of this embodiment is mounted on a reach-type forklift (hereinafter referred to as a forklift). In the following description, “front”, “rear”, “left”, and “right” are “front”, “rear”, and “left” when the forklift operator is facing the front direction (forward direction) of the forklift. “Right” shall be indicated.

  As shown in FIGS. 1 and 2, a pair of left and right reach legs 13 are extended in the front direction on a vehicle body 12 of a forklift 11 as an industrial vehicle. A front wheel 14 is provided in the front direction of each reach leg 13. In the rear direction of the vehicle body 12, a rear wheel 16 that is a steering wheel and a caster wheel 17 are disposed. The rear wheel 16 is provided in the left direction of the vehicle body 12, and the caster wheel 17 is provided in the right direction. In this embodiment, the forklift 11 travels on three wheels, ie, two front wheels 14 and one rear wheel 16. Further, the vehicle body 12 is provided with a motor M as a drive source of the forklift 11 and a battery B as a power source of the motor M.

  A cargo handling device 21 is provided in the front direction of the vehicle body 12. The cargo handling device 21 includes a mast 22 that moves back and forth by driving a reach cylinder (not shown) along each reach leg 13. A pair of left and right forks 23 are provided on the front side of the mast 22 via lift brackets 24. The fork 23 moves up and down along the mast 22.

  A standing-type cab 31 is provided at the rear of the vehicle body 12. In addition, with the cab 31 as a reference, it can be said that the side on which the reach leg 13 is provided is “front”, and the side opposite to “front” across the cab 31 is “rear”.

  Steering tables 32 a and 32 b are provided in the front direction and the left direction of the cab 31. A steering table 32a positioned in the front direction of the cab 31 includes a direction lever 33 that causes the forklift 11 to travel, a plurality of cargo handling levers 34 that operate the cargo handling device 21, a display 35 that serves as a display unit, and a mode selection switch 36. Is provided. A steering table 37 b for steering the rear wheel 16 is provided on the steering table 32 b located in the left direction of the cab 31. A foot pedal 38 is provided on the floor surface of the cab 31. The forklift 11 employs a so-called deadman brake in which the brake is released when the foot pedal 38 is depressed.

  As shown in FIG. 3, the forklift 11 includes a control unit 41. The control unit 41 includes a processing unit 41a that executes various processes in a predetermined procedure, and a storage unit 41b that stores information on various controls such as a control program. A direction sensor 42, a steering angle sensor 43, a mode selection switch 36, and a handle angle sensor 44 are connected to the control unit 41.

  The direction sensor 42 detects the operation direction and the operation amount of the direction lever 33. The operation direction of the direction lever 33 is a forward instruction direction for moving the forklift 11 forward and a reverse instruction direction for moving backward. Using the neutral position (center position) as a reference, the direction in which the direction lever 33 is tilted forward is the forward instruction direction, and the direction in which the direction lever 33 is tilted backward is the reverse instruction direction. The direction sensor 42 outputs an electrical signal corresponding to the operation direction and the operation amount of the direction lever 33 to the control unit 41.

  The handle angle sensor 44 is disposed on the handle 37 and detects an operation amount (angle) of the handle 37. The handle angle sensor 44 outputs an electrical signal corresponding to the operation amount of the handle 37 to the control unit 41.

The mode selection switch 36 outputs an electrical signal to the control unit 41 when operated by an operator.
The steering angle sensor 43 is provided on the vehicle body 12 and detects the steering angle of the rear wheel 16. The steering angle sensor 43 outputs an electrical signal corresponding to the steering direction of the rear wheel 16 to the control unit 41.

  The control unit 41 causes the forklift 11 to perform an operation according to the operation of the operator by performing control according to the electrical signals from the direction sensor 42, the steering angle sensor 43, and the mode selection switch 36.

  Further, the control unit 41 updates the display content of the display 35 in accordance with electrical signals from the direction sensor 42, the steering angle sensor 43, and the mode selection switch 36. In the present embodiment, the display device 50 includes the control unit 41 and the display 35.

  The forklift 11 described above can set a standard mode for moving back and forth and a lateral movement mode for moving left and right as travel modes. The mode is switched by operating the mode selection switch 36.

  As shown in FIG. 4A, when the vehicle travels straight in the standard mode, the front wheel 14 and the rear wheel 16 face forward and backward, and the forklift 11 moves straight forward and backward. As shown in FIG. 5A, only the rear wheel 16 faces obliquely during cornering in the standard mode. In the standard mode, the operator M1 operates by facing the front and rear of the forklift 11.

  As shown in FIG. 6A, when the vehicle travels straight in the lateral movement mode, the front wheel 14 and the rear wheel 16 face left and right. As shown in FIG. 7A, when cornering in the lateral movement mode, the front wheel 14 and the rear wheel 16 are directed obliquely.

  In the lateral movement mode, of the two front wheels 14, only the left front wheel 14 follows the rear wheel 16 and changes its direction, while the right front wheel 14 is maintained in one direction (see FIG. 7 (a)). Further, in the forklift 11 of the present embodiment, when the direction lever 33 is tilted forward in the lateral movement mode, the forklift 11 advances to the left, and when the direction lever 33 is tilted backward, the forklift 11 advances to the right. Therefore, the direction lever 33 serves as a member that instructs the movement in the right direction and the movement in the left direction instead of instructing the forward movement and the backward movement in some modes.

Next, display contents on the display 35 in the standard mode will be described.
In the standard mode, in FIG. 4A, the forward direction of the reach leg 13 is the forward direction. As shown in FIG. 4B at the time of forward movement in the standard mode and FIG. 4C at the time of backward movement, the display 35 shows the battery symbol BS indicating the remaining capacity of the battery B and the current traveling direction of the forklift 11. A square symbol S1 to S7 for indicating a traveling direction symbol DS, a current steering direction of the forklift 11, and a steerable range are displayed. Although not shown, vehicle information other than those described above is also displayed on the display 35.

  The traveling direction symbol DS is an arrow symbol and indicates the traveling direction of the forklift 11. If the forklift 11 is moving forward, that is, if the direction lever 33 is tilted forward from the neutral position, an arrow indicating the forward direction is displayed as the traveling direction symbol DS. On the other hand, if the forklift 11 is moving backward, that is, if the direction lever 33 is tilted backward from the neutral position, an arrow pointing backward is displayed as the traveling direction symbol DS.

  Further, the current steering direction and the steerable range can be expressed using the seven square symbols S1 to S7. Each of the seven square symbols S1 to S7 can be turned on in a square frame and can be turned on in a square. By turning on one of the seven square symbols S1 to S7, the current steering direction can be indicated. Further, when the square symbols S1 to S7 are turned on in a frame shape, a steerable range can be indicated.

  The seven square symbols S1 to S7 are positioned so as to draw a substantially semicircular shape. The second square symbol S2, the third square symbol S3, and the fourth square symbol S4 are counterclockwise from the first square symbol S1, based on the position of the first square symbol S1 positioned in the forward direction of the traveling direction symbol DS. It is located at a predetermined angle to the rotation side. The fifth square symbol S5, the sixth square symbol S6, and the seventh square symbol S7 are located at a predetermined angle offset from the first square symbol S1 in the clockwise direction. The second square symbol S2 and the fifth square symbol S5, the third square symbol S3 and the sixth square symbol S6, and the fourth square symbol S4 and the seventh square symbol S7 have the same angle from the first square symbol S1, respectively. It is an angle.

  Among the square symbols S1 to S7, the fourth square symbol S4 and the seventh square symbol S7, which are the symbols positioned in the rearmost direction, indicate the maximum steering angle θmax (+ θmax, −θmax). Each of the square symbols S1 to S7 corresponds to a steering angle within a predetermined range, and the square symbols S1 to S7 corresponding to the current steering direction (steering angle) are turned on by the control of the control unit 41. (It turns black). Then, the square symbols S1 to S7 different from the square symbols S1 to S7 corresponding to the current steering direction are turned on in a frame shape by the control unit 41.

  Specifically, in the standard mode, the first square symbol S1 is lit square when the steering angle with respect to the front-rear direction is the smallest. The first square symbol S1 is a range from the steering angle corresponding to the center of the first square symbol S1 and the second square symbol S2 to the steering angle corresponding to the center of the first square symbol S1 and the fifth square symbol S5. The square lights up when the steering angle is within A1. The second square symbol S2 is a range A2 from the steering angle corresponding to the center of the first square symbol S1 and the second square symbol S2 to the steering angle corresponding to the center of the second square symbol S2 and the third square symbol S3. Lights square when the steering angle is within. The third square symbol S3 is a range A3 from the steering angle corresponding to the center of the second square symbol S2 and the third square symbol S3 to the steering angle corresponding to the center of the third square symbol S3 and the fourth square symbol S4. Lights square when the steering angle is within. The fourth square symbol S4 is lit when the steering angle is within the steering angle range A4 corresponding to the fourth square symbol S4 from the steering angle corresponding to the center of the fourth square symbol S4 and the third square symbol S3. To do.

  The fifth square symbol S5 is a range A5 from the steering angle corresponding to the center of the first square symbol S1 and the fifth square symbol S5 to the steering angle corresponding to the center of the fifth square symbol S5 and the sixth square symbol S6. Lights square when the steering angle is within. The sixth square symbol S6 is a range A6 from the steering angle corresponding to the center of the fifth square symbol S5 and the sixth square symbol S6 to the steering angle corresponding to the center of the sixth square symbol S6 and the seventh square symbol S7. Lights square when inside. The seventh square symbol S7 is lit square when the steering angle is within the steering angle range A7 corresponding to the fourth square symbol S4 from the steering angle corresponding to the center of the sixth square symbol S6 and the seventh square symbol S7.

The angles from the square symbols S1 to S7 that are lit square to the fourth square symbol S4 and the seventh square symbol S7 are within the range that can be steered with respect to the current steering direction.
Next, display contents on the display 35 in the horizontal movement mode will be described.

  In the lateral movement mode, in FIG. 6A, the left and right direction of the reach leg 13 is the traveling direction. As shown in FIG. 6B, in the lateral movement mode, an arrow pointing in the left-right direction is displayed as the traveling direction symbol DS. The traveling direction symbol DS is an arrow pointing to the left when the direction lever 33 is tilted forward from the neutral position, and is an arrow pointing to the right when the direction lever 33 is tilted backward from the neutral position.

  In the horizontal movement mode, six symbols LS1, LS2, LS3, RS1, RS2, and RS3 are used. Each of the symbols LS1, LS2, LS3, RS1, RS2, and RS3 can be turned on in a square frame and can be turned on in a square. When one of the symbols LS1, LS2, LS3, RS1, RS2, and RS3 is squarely lit, the current steering direction can be indicated. Further, when the symbols LS1, LS2, LS3, RS1, RS2, and RS3 are turned on in a frame shape, a steerable range can be indicated.

  The display 35 displays left symbols LS1 to LS3 corresponding to the leftward movement of the forklift 11, and right symbols RS1 to RS3 corresponding to the rightward movement. Left symbols LS1 to LS3 and right symbols RS1 to RS3 indicate a steering direction and a steerable range in the lateral movement mode.

  Each of the left symbols LS1 to LS3 and the right symbols RS1 to RS3 corresponds to a steering direction within a predetermined range, and a symbol corresponding to the steering direction is squarely lit by control of the control unit 41 (black). Become). The symbols LS1 to LS3 and RS1 to RS3 that are different from the symbols LS1 to LS3 and RS1 to RS3 corresponding to the current steering direction are lit in a frame by the control unit 41.

  The left symbols LS1 to LS3 have a second left symbol LS2 that is shifted counterclockwise with the first left symbol LS1 positioned in the leftmost direction as a reference position, and a second clockwise symbol from the first left symbol LS1. 2 left symbol LS2 and third left symbol LS3 located at an equal angle. The second left symbol LS2 and the third left symbol LS3 indicate the maximum steering angle θmax (+ θmax, −θmax) when traveling in the left direction.

  The first left symbol LS1 lights up squarely when the steering angle with respect to the left direction is the smallest during traveling in the left direction. The first left symbol LS1 ranges from the steering angle corresponding to the center of the first left symbol LS1 and the second left symbol LS2 to the steering angle corresponding to the center of the first left symbol LS1 and the third left symbol LS3. The square lights up when the steering angle is within A11. The second left symbol LS2 is squarely lit when the steering angle is within a range A12 from the steering angle corresponding to the center of the first left symbol LS1 and the second left symbol LS2 to the steering angle corresponding to the second left symbol LS2. To do. The third left symbol LS3 is square-lit when the steering angle is within a range A13 from the steering angle corresponding to the center of the first left symbol LS1 and the third left symbol LS3 to the steering angle corresponding to the third left symbol LS3. To do.

Then, the angle from the left-lit left symbols LS1 to LS3 to the second left symbol LS2 and the third left symbol LS3 is a steerable range with respect to the current steering direction.
The right symbols RS1 to RS3 have a first right symbol RS1 positioned in the rightmost direction as a reference position, a second right symbol RS2 that is shifted counterclockwise, and a first clockwise symbol from the first right symbol RS1. 2 has a third right symbol RS3 located at an equal angle to the right symbol RS2. The second right symbol RS2 and the third right symbol RS3 indicate the maximum steering angle θmax (+ θmax, −θmax) when traveling in the right direction.

  The first right symbol RS1 lights up squarely when traveling in the right direction when the steering angle with respect to the right direction is the smallest. The first right symbol RS1 is a range from a steering angle corresponding to the center of the first right symbol RS1 and the second right symbol RS2 to a steering angle corresponding to the center of the first right symbol RS1 and the third right symbol RS3. The square lights up when the steering angle is within A21. The second right symbol RS2 is lit square when the steering angle is within the range A22 from the steering angle corresponding to the center of the first right symbol RS1 and the second right symbol RS2 to the steering angle corresponding to the second right symbol RS2. To do. The third right symbol RS3 is square-lit when the steering angle is within the range A23 from the steering angle corresponding to the center of the first right symbol RS1 and the third right symbol RS3 to the steering angle corresponding to the third right symbol RS3. To do.

Then, the angles from the right-lit symbols RS1 to RS3 to the second right symbol R2 and the third right symbol R3 are within a steerable range with respect to the current steering direction.
The number of each of the left symbols LS1 to LS3 and the right symbols RS1 to RS3 is smaller than the number of steering symbols in the standard mode. This is because the steerable range is smaller in the lateral movement mode than in the standard mode. That is, compared with the maximum steering angle θmax (+ θmax, −θmax) in the standard mode shown in FIGS. 4B, 4C, and 5B, FIGS. The maximum steering angle θmax (+ θmax, −θmax) in b) and FIG. 7C is narrower.

Next, the operation of the display device 50 of this embodiment will be described.
First, display in the standard mode will be described with reference to FIGS.
As shown in FIG. 4A, when the forklift 11 is moved (runs) in the case of straight traveling in the standard mode, the control unit 41 displays various symbols on the display 35 according to the standard mode. The control unit 41 changes the direction of the arrow of the traveling direction symbol DS as shown in FIGS. 4B and 4C according to the operation direction of the direction lever 33 input from the direction sensor 42. The control unit 41 grasps the steering direction of the forklift 11 from the steering angle input from the steering angle sensor 43, and turns on the square symbols S1 to S7 corresponding to the current steering direction.

  5A and 5B, when the handle 37 is operated and the forklift 11 is turned, the steering of the forklift 11 is performed as shown in FIG. 5B. The square symbols S1 to S7 corresponding to the direction are squarely lit. Here, in the industrial vehicle that is steered by the rear wheel 16 as in the present embodiment, the steering direction of the industrial vehicle at the time of forward movement is opposite to the direction in which the rear wheel 16 faces. That is, when the rear wheel 16 turns to the left, the forklift 11 is steered to the right, and when the rear wheel 16 turns to the right, the forklift 11 is steered to the left. Therefore, the control unit 41 according to the present embodiment converts the steering angle of the rear wheel 16 detected by the steering angle sensor 43 into the steering direction of the forklift 11 (for example, reverses the sign of the steering angle), and the steering direction. Control is performed so that the square symbols S1 to S7 corresponding to are lit square. In FIG. 5A, in order to turn the forklift 11 to the right side, the rear wheel 16 is directed to the left side. In the display 35, the fifth square symbol S5 is squarely lit.

  In the standard mode, the direction of the traveling direction symbol DS is changed when the forklift 11 is switched between forward and reverse. On the other hand, if the position of the rear wheel 16 is the same when the forklift 11 is moving forward and backward, the square symbols S1 to S7 that are square-lit are the same.

  The operator M1 of the forklift 11 can visually recognize the current traveling direction of the forklift 11 from the direction of the arrow of the traveling direction symbol DS, and can visually recognize the current steering direction from the square symbols S1 to S7 that are lit square. Can do. Further, the steerable range of the forklift 11 can be visually recognized from the square symbols S1 to S7 that are lit in a frame shape.

Next, display in the lateral movement mode will be described with reference to FIGS.
As shown in FIG. 6A, when the mode is changed from the standard mode to the lateral movement mode by the operation of the mode selection switch 36, the control unit 41 changes the direction of the arrow of the traveling direction symbol DS, and the left symbol LS1 to LS3 and right symbols RS1 to RS3 are displayed on the display 35. Thereby, a display suitable for the horizontal movement mode is performed on the display 35.

  As shown in FIG. 7 (a), when the handle 37 is operated from straight running, and the forklift 11 is traveling leftward with the left front wheel 14 and the rear wheel 16 facing lower left (direction) When the lever 33 is tilted forward), the control unit 41 displays a left-pointing arrow on the display 35 as the traveling direction symbol DS, as shown in FIG. Further, the control unit 41 causes the second left symbol LS2 to be squarely lit.

  When the left front wheel 14 and the rear wheel 16 are directed to the lower left and the forklift 11 is traveling rightward (when the direction lever 33 is tilted rearward), the control unit 41 is shown in FIG. As shown in c), the third right symbol RS3 is squarely lit.

  When the operator M1 is in the lateral movement mode, the traveling direction symbol DS suitable for the lateral movement mode, the left symbols LS1 to LS3, and the right symbols RS1 to RS3 to the current traveling direction of the forklift 11, the current steering direction, and A steerable range can be visually recognized.

Therefore, according to the above embodiment, the following effects can be obtained.
(1) The control unit 41 causes the display 35 to display a symbol suitable for the selected mode. Therefore, the operator M1 can visually recognize the traveling direction, the current steering direction, and the steerable range suitable for the mode according to the selection of the mode. Then, it is possible to grasp how much steering can be performed from the current traveling direction and the current steering direction to the limit of the steerable range.

  Here, in the standard mode and the lateral movement mode, the steerable range differs depending on the characteristics of the forklift 11, and it is understood that the characteristics are understood when turning a corner because the steerable range is different. Otherwise, there may be a situation where it cannot be turned around at once. If the operator M1 visually recognizes that the steerable range in the standard mode and the lateral movement mode is the same and enters the corner, the actual steerable range is smaller than the steerable range assumed by the operator M1, A situation occurs in which the corner cannot be bent, and the operability is deteriorated.

  By performing display suitable for each mode in the standard mode and the lateral movement mode as in the present embodiment, it is possible to perform display suitable for the mode when turning a corner. Thereby, the operator M1 can perform an appropriate operation while understanding the characteristics depending on the mode.

  (2) In the horizontal movement mode, the left symbols LS1 to LS3 corresponding to the progression in the left direction and the right symbols RS1 to RS3 corresponding to the progression in the right direction are displayed on the display 35. That is, a symbol corresponding to the reverse side with respect to the current traveling direction is also displayed. Therefore, in the lateral movement mode, only one of the left symbols LS1 to LS3 and the right symbols RS1 to RS3 is displayed, and the steerable range is compared to the case where the display is switched according to the operation direction of the direction lever 33. Is easily visible to the operator M1.

In addition, you may change embodiment as follows.
○ As shown in FIG. 4C and the like, the traveling direction symbol DS is indicated by an arrow. Instead, as shown in FIGS. 8A and 8B, the direction lever 33 is moved to the direction lever 33. Corresponding display may be performed. The display 35 has a left progress symbol L with a left-pointing arrow displayed in the frame, a right progress symbol R with a right-pointing arrow displayed in the frame, and a neutral symbol with “N” displayed in the frame. N is displayed. In each of the symbols L, N, and R, the left progress symbol L is positioned most forward, the neutral symbol N is positioned rearward of the left progress symbol L, and the right progress symbol is rearward of the neutral symbol N. It is arranged so that R is located. That is, the symbols L, N, and R are arranged so that the traveling direction indicated by each symbol corresponds to the operation direction of the direction lever 33.

  Then, when the direction lever 33 is tilted forward, as shown in FIG. 8A, a portion of the left progress symbol L excluding the arrow is turned on, so that the left progress symbol L is outlined. Further, when the direction lever 33 is tilted backward, as shown in FIG. 8B, the portion of the right progress symbol R excluding the arrow is lit, so that the right progress symbol R becomes white. Therefore, by highlighting the display corresponding to the direction lever 33 by reverse display, the traveling direction can be visually recognized by the operator M1. When the direction lever 33 is in the neutral position, the neutral symbol N is lit.

  Further, the symbols L, N, and R corresponding to the direction lever 33 are arranged in correspondence with the direction of operation of the direction lever 33, and the direction of travel is indicated by an arrow, so that the forklift 11 travels corresponding to the direction of operation of the direction lever 33. The direction can be visually recognized by the operator M1.

  The correspondence of the operation direction of the direction lever 33 is not limited to the aspect shown in FIG. For example, as shown in FIG. 9, “DIR PUSH” may be displayed corresponding to the left symbols LS1 to LS3. Here, DIR means “direction lever”, and PUSH means “push”. Therefore, it is shown that the forklift 11 advances to the left by pushing the direction lever 33 and tilting it forward. Similarly, “DIR PULL” may be displayed corresponding to the right symbols RS1 to RS3. PULL means “pull” and indicates that the forklift 11 advances in the right direction by pulling the direction lever 33 and tilting it backward.

  In the horizontal movement mode, only one of the left symbols LS1 to LS3 corresponding to the leftward movement and the right symbols RS1 to RS3 corresponding to the rightward movement may be displayed. The display of the left symbols LS <b> 1 to LS <b> 3 and the right symbols RS <b> 1 to RS <b> 3 is switched according to the position of the direction lever 33.

  The display of the traveling direction displayed on the display 35 is not limited to the traveling direction symbol DS. For example, in the embodiment, if any of the left symbols LS <b> 1 to LS <b> 3 is lit, the forklift 11 can be visually recognized as traveling in the left direction, and if any of the right symbols RS <b> 1 to RS <b> 3 is lit, The forklift 11 can be visually recognized when traveling in the right direction.

The current steering direction, steerable range, and traveling direction may be displayed in a form other than symbols, such as numerical values.
The display device may be mounted in addition to the forklift 11 as long as it is an industrial vehicle that can perform the standard mode and the lateral movement mode.

○ The number of symbols such as a square symbol, a right symbol, and a left symbol may be increased or decreased.
The steering direction of the wheel may be detected from the operation amount of the handle 37 detected by the handle angle sensor 44.

-An industrial vehicle with front wheel steering may be used as the industrial vehicle.
In the embodiment, the display 35 is controlled by the control unit 41 that controls the travel of the forklift 11, but the control unit 41 that controls the travel of the forklift 11 and the control unit that controls the display 35 (of the display device 50. The control unit) may be different.

○ When the display 35 is switched according to the driving mode, notification may be performed by blinking various symbols or sounding a buzzer sound.
The symbol indicating the current steering direction and the steerable range may be any symbol as long as the two types of display (frame lighting and square lighting in the embodiment) can be switched. A square lighting and a triangular lighting may be switched.

  DS: traveling direction symbol, S1 to S7: square symbol, LS1 to LS3 ... left symbol, RS1 to RS3 ... right symbol, 11 ... forklift, 14 ... front wheel, 16 ... rear wheel, 35 ... display, 41 ... control unit, 42 ... Direction sensor, 43 ... Steering angle sensor, 50 ... Display device.

Claims (3)

In addition to the standard mode for moving back and forth, a lateral movement mode for moving left and right can be set, and the display device is mounted on an industrial vehicle capable of traveling while steering in a selected traveling direction,
A display device configured to display a current traveling direction, a current steering direction, and a steerable range corresponding to a mode with respect to the current steering direction on a display unit.   The display device according to claim 1, wherein a steerable range in a direction opposite to the current traveling direction is also displayed on the display unit when the lateral movement mode is set.   The display device according to claim 1, wherein an instruction content for an operation direction in a direction lever that is an operation member for selecting a traveling direction is also displayed on the display unit.

Images