Load pedestal lifting apparatus and specially-equipped vehicle provided with the same

Abstract

To provide a load pedestal lifting apparatus capable of increasing safety for not only operators but also people other than the operators while suppressing reduction in work efficiency of loading work, and a specially equipped vehicle provided with the same.SOLUTION: A load pedestal lifting apparatus 16 comprises: a load pedestal 20; a load pedestal lifting mechanism 30 for lifting the load pedestal 20; a detection device 40 that detects a person on or around the load pedestal 20; and a control device 80 that controls the load pedestal lifting mechanism 30. The control device 80 includes an operator identification unit 81 that identifies an operator by determining whether the person detected by the detection device 40 has a protector on, and a load pedestal movement control unit 84 that allows the load pedestal lifting mechanism 30 to move the load pedestal 20 when the person identified by the operator identification unit 81 is an operator and inhibits the load pedestal lifting mechanism 30 from moving the load pedestal 20 when the person identified by the operator identification unit 81 is not an operator.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present invention relates to a load receiving platform lifting device and a special vehicle equipped with the same.

Background Art

[0002] Conventionally, a special vehicle equipped with a load receiving platform lifting device having a load receiving platform and a load receiving platform lifting mechanism for lifting the load receiving platform is known. By placing a load on the load receiving platform and moving the load receiving platform by the load receiving platform lifting mechanism, the work load of loading and unloading the load by the operator can be reduced. On the other hand, it is not preferable for a person to come into contact with the operating load receiving platform. Therefore, a load receiving platform lifting device equipped with a mechanism for preventing contact between a person and the operating load receiving platform has been known.

[0003] For example, Patent Document 1 discloses a load receiving platform lifting device with a safety device including a first detection device, a second detection device, and a control device. In this load receiving platform lifting device with a safety device, when the load receiving platform rises to the upper end position, the first detection device enters a detection state. Also, when a person is present below the load receiving platform, the second detection device enters a detection state. When both the first detection device and the second detection device are in the detection state, even if the operator tries to lower the load receiving platform, the control device prohibits the lowering of the load receiving platform. Thereby, when a person is present below the load receiving platform, the load receiving platform does not move, and it is prevented that the moving load receiving platform comes into contact with a person.

[0004] In addition, the load receiving platform lifting device is also used in places where people other than the operator, such as on public roads, can approach. Therefore, there is also a possibility that a person other than the operator may come into contact with the load receiving platform. Thus, Patent Document 2 discloses a load receiving platform lifting device having a light irradiation device. The light irradiation device irradiates a light beam indicating the area of the ground occupied when the load receiving platform touches the ground. Thereby, it is possible to grasp where the load receiving platform touches the ground, and it is easier for people other than the operator to predict the operation of the load receiving platform.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] It is generally considered that people other than the operator approach the loading platform from the side or rear of the loading platform. Therefore, in the loading platform lifting device disclosed in Patent Document 1, it is difficult to detect people other than the operator. Further, in the loading platform lifting device disclosed in Patent Document 2, there is a possibility that a person other than the operator may approach the operating loading platform because the person does not notice the light irradiated from the light irradiation device or for other reasons.

[0007] From the above, in order to ensure that people other than the operator do not come into contact with the operating loading platform, it is preferable to configure the loading platform lifting device so that people on the side or rear of the loading platform can also be detected and the movement of the loading platform can be controlled based on the detection result. On the other hand, if the movement of the loading platform is uniformly restricted by detecting people on the side or rear, the operator may also be detected, and the movement of the loading platform may stop even though the operator is working. As a result, the work efficiency of the loading operation may decrease.

[0008] The present invention has been made in view of this point, and an object thereof is to provide a loading platform lifting device that can enhance safety not only for the operator but also for people other than the operator while suppressing a decrease in the work efficiency of the loading operation, and a special vehicle equipped with the same.

Means for Solving the Problems

[0009] The loading platform lifting device according to the present invention is a loading platform lifting device provided at the rear of the loading box of a special vehicle. The loading platform lifting device includes a loading platform, a loading platform lifting mechanism for lifting the loading platform, a detection device for detecting a person on or around the loading platform, and a control device for controlling the loading platform lifting mechanism. The control device includes a worker determination unit that determines whether a person detected by the detection device is a worker based on predetermined determination conditions, and when the person determined by the worker determination unit is the worker, permits the movement of the loading platform by the loading platform lifting mechanism, and when the person determined by the worker determination unit is not the worker, executes control to prohibit the movement of the loading platform by the loading platform lifting mechanism, and a loading platform movement control unit.

[0010] According to the above configuration, a person around the loading platform can be discriminated between a worker and a non-worker, and the control of the loading platform lifting device can be performed according to the person. When the person around the loading platform is a worker, the movement of the loading platform is permitted, so that a decrease in the efficiency of the loading and unloading work can be suppressed. When the person around the loading platform is a non-worker, the movement of the loading platform is prohibited, so that the safety for non-workers can be improved.

[0011] The control device may further include an area setting unit that divides and sets the periphery of the loading platform into a plurality of areas, and an area determination unit that determines in which area among the plurality of areas the person detected by the detection device is located. The loading platform movement control unit may permit or prohibit the movement of the loading platform by the loading platform lifting mechanism based on the determination result of the worker determination unit and the determination result of the area determination unit.

[0012] According to the above configuration, it is possible to determine in which area a person around the loading platform is located, and to determine whether the person is a worker, and to control the loading platform lifting device. While suppressing a decrease in the efficiency of the loading and unloading work, the safety can be enhanced.

[0013] The area setting unit may set the sides and rear of the load receiving platform as a first area. When the person detected by the detection device is determined to be the operator by the operator determination unit and is determined to be in the first area by the area determination unit, the load receiving platform movement control unit may permit the movement of the load receiving platform by the load receiving platform lifting mechanism. When the person detected by the detection device is determined to be a person other than the operator by the operator determination unit and is determined to be in the first area by the area determination unit, the load receiving platform movement control unit may prohibit the movement of the load receiving platform by the load receiving platform lifting mechanism.

[0014] A person other than the operator is usually considered to approach from the sides or rear of the load receiving platform. According to the above configuration, when a person other than the operator approaches from the sides or rear of the load receiving platform, the load receiving platform does not move, so the safety for persons other than the operator can be improved. On the other hand, when the operator is on the side or rear of the load receiving platform, the load receiving platform can be moved, so the efficiency of the loading and unloading work does not decrease.

[0015] The area setting unit may set the area below the load receiving platform as a second area. When the person detected by the detection device is determined to be the operator or a person other than the operator by the operator determination unit and is determined to be in the second area by the area determination unit, the load receiving platform movement control unit may prohibit the movement of the load receiving platform by the load receiving platform lifting mechanism.

[0016] According to the above configuration, when there is an operator or a person other than the operator below the load receiving platform, the movement of the load receiving platform is prohibited. Thereby, when there is a person below the load receiving platform, the load receiving platform does not move, and safety can be improved.

[0017] The area setting unit may set the inside of the loading box as the third area. When the person detected by the detection device is determined to be the operator by the operator determination unit and is determined to be in the third area by the area determination unit, the loading platform movement control unit may permit the movement of the loading platform by the loading platform lifting mechanism. When the person detected by the detection device is determined to be a person other than the operator by the operator determination unit and is determined to be in the third area by the area determination unit, the loading platform movement control unit may prohibit the movement of the loading platform by the loading platform lifting mechanism.

[0018] According to the above configuration, when there is a person other than the operator inside the loading box, the movement of the loading platform is prohibited, so the safety for persons other than the operator can be improved. Also, when only the operator is inside the loading box, the loading platform can be moved, so the efficiency of the loading and unloading work does not decrease.

[0019] The area setting unit may set the area above the loading platform as the fourth area. When the person detected by the detection device is determined to be the operator or a person other than the operator by the operator determination unit and is determined to be in the fourth area by the area determination unit, the loading platform movement control unit may prohibit the movement of the loading platform by the loading platform lifting mechanism.

[0020] According to the above configuration, when a person is on the loading platform regardless of whether the person is the operator, the movement of the loading platform is prohibited, so the safety can be improved.

[0021] The area setting unit may set the area at a height equal to or higher than the floor of the loading box and behind the loading platform as the fifth area. When the loading platform and the floor of the loading box are at the same height, and the person detected by the detection device is determined to be the operator or a person other than the operator by the operator determination unit and is determined to be in the fifth area by the area determination unit, the loading platform movement control unit may prohibit the movement of the loading platform by the loading platform lifting mechanism.

[0022] According to the above configuration, when loading and unloading luggage using a track bar or the like, it is possible to prevent an operator or a person other than the operator near the loading platform from contacting the moving loading platform. Safety can be improved.

[0023] The loading platform lifting device according to the present invention includes a loading platform, a loading platform lifting mechanism for lifting and lowering the loading platform, a detection device for detecting a person on or around the loading platform, and a control device provided with a worker determination unit that determines whether or not the person detected by the detection device is a worker based on a predetermined determination condition, and a notification device that performs notification when the person determined by the worker determination unit is not the worker.

[0024] According to the above configuration, when a person around the loading platform is a person other than the operator, notification by the notification device is performed. Thereby, it is possible to prompt a person other than the operator around the loading platform to evacuate from around the loading platform. In addition, it is possible to prevent the operator from operating the loading platform lifting device without noticing that there is a person other than the operator around the loading platform. Therefore, it is possible to improve safety while suppressing a decrease in work efficiency.

[0025] The control device may further include an area setting unit that divides and sets the periphery of the loading platform into a plurality of areas, and an area determination unit that determines in which of the plurality of areas the person detected by the detection device is located. The notification device may perform notification when the determination result by the worker determination unit and the determination result of the area determination unit become a predetermined result.

[0026] According to the above configuration, after determining in which area a person around the loading platform is located and whether or not the person is a worker, notification by the notification device is performed. Thereby, when a non-worker intrudes around the loading platform or when a worker intrudes into an area where safety is prioritized, notification by the notification device is performed. Therefore, the safety of the cargo handling work can be enhanced.

[0027] The load receiving platform lifting device according to the present invention includes a load receiving platform, a load receiving platform lifting mechanism for lifting and lowering the load receiving platform, a detection device for detecting an operator on or around the load receiving platform, and a control device for controlling the load receiving platform lifting mechanism. The control device includes a region setting unit that divides and sets the periphery of the load receiving platform into a plurality of regions, a region determination unit that determines which region among the plurality of regions the operator detected by the detection device is in, and a load receiving platform movement control unit that permits or prohibits the movement of the load receiving platform by the load receiving platform lifting mechanism based on the determination result of the region determination unit.

[0028] According to the above configuration, the control of the load receiving platform lifting device can be performed according to which region the operator is in. Thereby, when there is an operator in a region where safety is prioritized, the movement of the load receiving platform can be prohibited to improve safety. When there is an operator in a region where work efficiency is prioritized, the movement of the load receiving platform can be permitted to suppress a decrease in work efficiency.

[0029] The detection device may be an imaging device that images the load receiving platform and the periphery of the load receiving platform. The operator discrimination unit may discriminate whether the detected person is the operator based on the image captured by the imaging device.

[0030] According to the above configuration, it is possible to discriminate whether the person detected by the detection device is the operator with a relatively simple configuration.

[0031] The operator discrimination unit may discriminate whether the person detected by the imaging device is wearing protective gear. When the person detected by the imaging device is wearing protective gear, the operator discrimination unit may discriminate that the person detected by the imaging device is the operator, and when the person detected by the imaging device is not wearing protective gear, the operator discrimination unit may discriminate that the person detected by the imaging device is a person other than the operator.

[0032] According to the above configuration, it is possible to accurately discriminate whether the detected person is the operator or a person other than the operator.

[0033] The control device may have a storage unit that stores the detection information detected by the detection device.

[0034] According to the above configuration, it is possible to confirm whether inappropriate work has been performed after the end of the cargo handling work or the like.

[0035] It may be provided with a transmission device that transmits the detection information to the outside.

[0036] According to the above configuration, the working status can be confirmed in real time even from a distance. Also, even if cargo handling work using the loading platform lifting device is being performed at different locations simultaneously, these working statuses can be confirmed collectively. Therefore, it is highly convenient for the administrator who manages the cargo handling work.

[0037] Furthermore, the special vehicle according to the present invention includes the loading platform lifting device and a chassis extending in the front-rear direction.

[0038] According to such a special vehicle, when an operator performs cargo handling work, it is possible to suppress a decrease in work efficiency and make the special vehicle highly safe not only for the operator but also for non-operators.

Effect of the Invention

[0039] According to the present invention, it is possible to provide a loading platform lifting device that can suppress a decrease in the work efficiency of cargo handling work and enhance safety not only for the operator but also for people other than the operator, and a special vehicle equipped with the same.

Brief Description of the Drawings

[0040]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Embodiments for Carrying Out the Invention

[0041] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of the special equipment vehicle 10 according to this embodiment. FIG. 2 is a rear view of the special equipment vehicle 10 according to this embodiment. As shown in FIG. 1, the special equipment vehicle 10 includes a cab 11 having a driver's seat (not shown) inside, a chassis 12 that supports the cab 11, left and right front wheels 13 provided at the front of the chassis 12, and left and right rear wheels 14 provided at the rear of the chassis 12. Further, the special equipment vehicle 10 includes a loading box 15 and a load receiving platform lifting device 16. The loading box 15 is supported by the chassis 12. The loading box 15 is disposed behind the cab 11. The loading box 15 is formed in a box shape. The load receiving platform lifting device 16 is disposed behind the loading box 15.

[0042] Figure 3 is an enlarged view of the vicinity of the load receiving platform lifting device 16. The load receiving platform lifting device 16 is a device used when loading and unloading luggage and the like stored in the load box 15. A support member 18 extending in the left - right direction is fixed to the rear end portion of the chassis 12. A connecting member 19 extending rearward is fixed to the support member 18. A bracket 17 is fixed to the connecting member 19. The load receiving platform lifting device 16 is connected to the chassis 12 via the bracket 17, the support member 18, and the connecting member 19. The load receiving platform lifting device 16 includes a load receiving platform 20, a load receiving platform lifting mechanism 30, an operating device 50 (see FIG. 1), a switch unit 60, a hydraulic circuit 70 (see FIG. 1), a control device 80 (see FIG. 9), and a wireless device 90.

[0043] The load receiving platform 20 is disposed behind the load box 15. The load receiving platform 20 includes a load receiving platform main body 21, a reinforcing body 22, and a connecting bracket 23. The load receiving platform 20 is changed in posture between a horizontal state and an upright state by a gate cylinder 22a described later. Here, the horizontal state is a state where the load receiving platform main body 21 is horizontal with the floor surface as shown in FIG. 3. Also, the upright state is a state where the load receiving platform main body 21 and the load box 15 face each other as shown in FIG. 4. In this specification, when the positional relationship regarding the load receiving platform 20 and the load receiving platform main body 21 is defined, unless otherwise specified, the state of the load receiving platform 20 refers to the horizontal state as shown in FIG. 3. For example, "disposed above the load receiving platform 20" means disposed above the load receiving platform 20 in the horizontal state. The front side when the load receiving platform 20 is in the horizontal state is the base end portion of the rotation of the load receiving platform 20. The load receiving platform 20 is lifted and lowered in the vertical direction in the horizontal state by the load receiving platform lifting mechanism 30. In the present embodiment, the position of the upper end of the vertical lifting range of the load receiving platform 20 is a position where the load receiving platform main body 21 and the floor surface inside the load box 15 are flush as shown in FIG. 3. Also, the position of the lower end of the vertical lifting range of the load receiving platform 20 is a position where a link arm 34 of the load receiving platform lifting mechanism 30 described later contacts the floor surface as shown in FIG. 5.

[0044] FIG. 6 is a plan view of the load receiving table 20 in the horizontal state. The load receiving table main body 21 is a member that serves as a loading platform for luggage. As shown in FIG. 6, the load receiving table main body 21 is formed in a rectangular shape. The load receiving table main body 21 is provided with side moldings 21a. The side moldings 21a extend in the front-rear direction. The side moldings 21a are fixed so as to cover the left and right ends of the load receiving table main body 21 respectively. The side moldings 21a are members that protect the left and right ends of the load receiving table main body 21. The upper ends of the side moldings 21a are formed higher than the upper ends of the upper surface of the load receiving table main body 21. Note that the side moldings 21a may be provided only on either the left or right side of the load receiving table main body 21.

[0045] The reinforcing members 22 are provided below the load receiving table main body 21. As shown in FIG. 2, two reinforcing members 22 are provided side by side in the left-right direction. The reinforcing members 22 are hollow reinforcing members.

[0046] As shown in FIG. 2, in the present embodiment, the reinforcing member 22 is provided with a gate cylinder 22a. The gate cylinder 22a is a cylinder that contracts and extends in the vertical direction. In the present embodiment, the gate cylinder 22a is a hydraulic cylinder. The gate cylinder 22a is connected to a link arm 34 described later. The gate cylinder 22a is provided for changing the posture of the load receiving table 20 between the horizontal state and the standing state. When the load receiving table 20 is in the horizontal state (see FIG. 3), the gate cylinder 22a is contracted. When the gate cylinder 22a extends, the load receiving table 20 rotates upward (counterclockwise in FIG. 3) about the front side of the load receiving table 20. As a result, the load receiving table 20 becomes the standing state (see FIG. 4). When the load receiving table 20 is in the standing state, the gate cylinder 22a is extended. When the gate cylinder 22a contracts when the load receiving table 20 is in the standing state, the load receiving table 20 rotates downward (clockwise in FIG. 3) to become the horizontal state. Note that the gate cylinder 22a may not be provided, and the posture of the load receiving table 20 may be manually changed.

[0047] As shown in Fig. 3, the connecting bracket 23 is provided on the proximal end side of the reinforcing body 22. The connecting bracket 23 is connected to a link arm 34 of a load receiving platform lifting mechanism 30 described later by a pin P5.

[0048] As shown in Fig. 3, the load receiving platform lifting mechanism 30 is constituted by a link mechanism including a tilt link 31, a lift arm 32, a compression arm 33, a link arm 34, and a lift cylinder 35. As shown in Fig. 2, two load receiving platform lifting mechanisms 30 are provided side by side in the left - right direction. Here, the load receiving platform lifting mechanism 30 arranged on the left side among the two load receiving platform lifting mechanisms 30 will be used for explanation. For each of the parts 31 - 35 of the load receiving platform lifting mechanism 30 arranged on the right side among the two load receiving platform lifting mechanisms 30, the left - right positional relationship is opposite to the following explanation.

[0049] As shown in Fig. 3, the tilt link 31 extends in the vertical direction. The upper part of the tilt link 31 is rotatably connected to the upper part of the bracket 17 via a pin P1. The tilt link 31 is provided so as to rotate between a state where the lower part of the tilt link 31 contacts the support member 18 and a state where the lower part of the tilt link 31 is spaced rearward from the support member 18.

[0050] The lift arm 32 is a member extending in the front - rear direction. One end of the lift arm 32 is rotatably connected to the tilt link 31 via a pin P2 below the pin P1. The other end of the lift arm 32 is rotatably connected to the link arm 34 by a pin P5.

[0051] The compression arm 33 is arranged below the lift arm 32. The compression arm 33 is a member extending in the front - rear direction. As shown in Fig. 7, one end of the compression arm 33 is rotatably connected via a pin P3 between the bracket 17 and a bracket piece 17a facing the bracket 17 from the left. As shown in Fig. 3, the other end of the compression arm 33 is rotatably connected to the link arm 34 via a pin P6.

[0052] The link arm 34 is disposed behind the load box 15. The link arm 34 is connected to the compression arm 33 by a pin P6. The link arm 34 is connected to the gate cylinder 22a. The link arm 34 is connected to the connecting bracket 23 via a pin P5.

[0053] The lift cylinder 35 is disposed below the lift arm 32. The lift cylinder 35 is a cylinder extending in the front-rear direction. In the present embodiment, the lift cylinder 35 is a hydraulic cylinder. As shown in FIG. 3, one end of the lift cylinder 35 is rotatably connected to the tilt link 31 via a pin P4. The other end of the lift cylinder 35 is rotatably connected to a substantially middle portion of the lift arm 32 via a pin P7. When the lift cylinder 35 extends, the load receiving base 20 rises. When the lift cylinder 35 contracts, the load receiving base 20 descends. When the load receiving base 20 is at the lowermost position as shown in FIG. 5 and the lift cylinder 35 is further contracted, the load receiving base 20 rotates clockwise about the pin P5 as a fulcrum. Thereby, as shown in FIG. 8, the tip portion 21b of the load receiving base main body 21 contacts the floor surface.

[0054] FIG. 9 is a block diagram of the special vehicle 10 according to the present embodiment. As shown in FIG. 9, the gate cylinder 22a and the lift cylinder 35 are connected to a hydraulic circuit 70. By supplying hydraulic oil from the hydraulic circuit 70 to the gate cylinder 22a and the lift cylinder 35, the gate cylinder 22a and the lift cylinder 35 contract or extend. As shown in FIG. 1, the hydraulic circuit 70 is disposed below the load box 15. The hydraulic circuit 70 is covered with a resin case. Inside the case, an electric motor, a hydraulic pump, a solenoid valve, etc. are provided. However, the configuration of the hydraulic circuit 70 is not particularly limited.

[0055] As shown in FIG. 9, the operating device 50 includes an operation unit 51 and a receiver 52. The operating device 50 is a device for the operator 3 to operate the loading platform lifting device 16. Although detailed illustration is omitted, the operation unit 51 is provided with, for example, a lever, buttons, and the like. The operator 3 can operate the loading platform lifting device 16 by operating the lever or buttons provided on the operation unit 51. The operation unit 51 is electrically connected to a loading platform movement control unit 84 of a control device 80 described later. As shown in FIG. 1, the operation unit 51 is disposed on a side portion of the chassis 12. Here, the operation unit 51 is provided on the left side portion of the chassis 12, but it may be provided on the right side portion. The receiver 52 is capable of wireless communication. As shown in FIG. 9, the receiver 52 is wirelessly connected to a switch unit 60.

[0056] The switch unit 60 is a unit that switches between ON and OFF of operations by the operating device 50 and the wireless device 90. When the switch unit 60 is turned ON, the operator 3 can operate the loading platform lifting device 16 by the operating device 50 and the wireless device 90. On the other hand, when the switch unit 60 is turned OFF, the operator 3 cannot operate the loading platform lifting device 16 by the operating device 50 and the wireless device 90.

[0057] The main switch 61 is a switch that can switch between ON and OFF of operations by the operating device 50 and the wireless device 90. Although illustration is omitted, the main switch 61 is provided with, for example, a switch button and the like. The operator 3 can switch between ON and OFF of operations by the operating device 50 and the wireless device 90 each time the switch button is pressed. The transmitter 62 is capable of wireless communication. As shown in FIG. 9, the transmitter 62 is wirelessly connected to the receiver 52 of the operating device 50 and a receiving unit 94 of a wireless device 90 described later. The transmitter 62 transmits the switching state of the main switch 61 to the receiver 52 and the receiving unit 94.

[0058] As shown in FIG. 10, the wireless device 90 includes a power button 91, an up button 92, a down button 93, and a receiving unit 94 (see FIG. 9). The receiving unit 94 is provided inside the wireless device 90. The power button 91 is a button for switching the power of the wireless device 90 on and off. The up button 92 and the down button 93 are buttons for operating the lifting and lowering of the load receiving table 20. While the up button 92 or the down button 93 is being pressed, the wireless device 90 sends a signal to a control device 80 described later so that the load receiving table 20 rises or falls. Therefore, while the up button 92 or the down button 93 is being pressed by the operator 3, the control device 80 controls the hydraulic circuit 70 to operate the gate cylinder 22a or the lift cylinder 35. Thereby, the load receiving table 20 rotates or moves up and down. The receiving unit 94 is wirelessly connected to the transmitter 62 of the switch unit 60. When the receiving unit 94 does not receive a signal from the transmitter 62, the wireless device 90 is configured not to send a signal to the control device 80 even if the up button 92 and the down button 93 are pressed. In the present embodiment, the wireless device 90 is a portable device that can be held and operated by the operator 3.

[0059] When the load receiving table lifting mechanism 30 is operated with the operator 3 or a non-operator 4 (a person other than the operator 3) on or around the load receiving table 20, there is a possibility that the operator 3 or the non-operator 4 may come into contact with the moving load receiving table 20. Therefore, the load receiving table lifting device 16 according to the present embodiment includes a detection device 40 for detecting the operator 3 and the non-operator 4. In the present embodiment, as shown in FIG. 9, the detection device 40 includes an imaging device 41 and a sensor 42. As shown in FIG. 1, the imaging device 41 is provided at the upper end of the load box 15. The imaging device 41 is, for example, a camera or the like. The imaging device 41 images the load receiving table 20 and the surroundings of the load receiving table 20. As shown in FIG. 1, the sensor 42 is provided at the rear end of the chassis 12. The sensor 42 is a sensor for detecting whether there is a person below the load receiving table 20. The sensor 42 is, for example, an infrared sensor or the like. However, the type and arrangement of the detection device 40 are not limited to this. For example, a camera or the like may be used instead of the infrared sensor as the sensor 42.

[0060] The control device 80 is a device that controls the operation of the load receiving platform lifting device 16. The control device 80 includes an operator discrimination unit 81, a region setting unit 82, a region determination unit 83, a load receiving platform movement control unit 84, and a storage unit 85. The control device 80 is, for example, a microcomputer or the like.

[0061] The operator discrimination unit 81 is a processing unit that discriminates whether the person imaged by the imaging device 41 is the operator 3. In the present embodiment, it discriminates whether the imaged person is wearing protective gear 5 (such as a helmet) and then discriminates whether it is the operator 3. If the person is wearing the protective gear 5, it is discriminated as the operator 3, and if not wearing the protective gear 5, it is discriminated as a non-operator 4 (see FIG. 1). However, the method for discriminating whether the person imaged by the imaging device 41 is the operator 3 is not limited to this. For example, it may be determined that a person touching the operating device 50, a person holding the wireless device 90, or a person wearing a specific mark is the operator 3.

[0062] The region setting unit 82 is a processing unit that divides the periphery of the load receiving platform 20 into a plurality of regions. In the present embodiment, as shown in FIG. 6, the side and rear of the load receiving platform 20 are the first region A1, the lower part of the load receiving platform 20 is the second region A2, the inside of the load box 15 and the vicinity of the load receiving platform 20 is the third region A3, and the upper part of the load receiving platform 20 is the fourth region A4, so that the periphery of the load receiving platform 20 is divided into four regions. Specifically, the second region A2 includes not only the region overlapping the load receiving platform main body 21 in plan view, but also the region between the load receiving platform main body 21 and the load box 15 and the region within a predetermined distance (for example, 30 cm) from the load receiving platform main body 21 laterally or rearward. The first region A1 occupies the region within a predetermined distance (for example, 1 m) from the end of the second region A2. The third region A3 occupies the region inside the load box 15 within a predetermined distance (for example, 30 cm) from the load receiving platform 20. Note that the method of dividing the regions is not limited to this.

[0063] The area determination unit 83 is a processing unit that determines in which area a person captured by the imaging device 41 or a person detected by the sensor 42 is located. In the present embodiment, since the sensor 42 is configured to detect below the loading platform 20, a person detected by the sensor 42 is determined to be in the second area A2. For a person captured by the imaging device 41, based on the captured image, it is determined in which area the person is located.

[0064] The loading platform movement control unit 84 is a processing unit that controls the movement of the loading platform 20 by controlling the hydraulic circuit 70. The loading platform movement control unit 84 is electrically connected to the operating device 50. The loading platform movement control unit 84 is communicably connected to the wireless device 90. When the discrimination results of the operator discrimination unit 81 and the area determination unit 83 become a predetermined result described later, the loading platform movement control unit 84 prohibits the movement of the loading platform 20.

[0065] The storage unit 85 is a processing unit that stores the detection information by the detection device 40. The information stored in the storage unit 85 is not particularly limited. For example, the storage unit 85 may store an image captured by the imaging device 41. Further, the storage unit 85 may store the discrimination results of the operator discrimination unit 81 and the area determination unit 83.

[0066] As shown in FIG. 9, the loading platform lifting device 16 includes a transmitting device 75. The transmitting device 75 is electrically connected to the control device 80. The transmitting device 75 is a device that transmits the detection information of the detection device 40 stored in the storage unit 85 of the control device 80 to the outside. The configuration of the transmitting device 75 is not particularly limited, but in the present embodiment, it is configured to be able to perform wireless communication with an external device.

[0067] The load receiving platform lifting device 16 is provided with a notification device 78. The notification device 78 is electrically connected to a control device 80. When the discrimination results of the worker discrimination unit 81 and the area determination unit 83 described later become a predetermined result, the notification device 78 gives a notification to the worker 3 and the non-worker 4. In the present embodiment, the notification device 78 gives a notification to the worker 3 and the non-worker 4 by sounding an alarm. Note that the configuration of the notification device 78 is not limited to this, and for example, it may be configured to give a notification to the worker 3 and the non-worker 4 by irradiating light to the rear or side of the load receiving platform 20 using a lamp.

[0068] As described above, when the load receiving platform lifting device 16 is operated with a person around the load receiving platform 20, the moving load receiving platform 20 may come into contact with the person. On the other hand, if the movement of the load receiving platform 20 is uniformly restricted regardless of whether the person around the load receiving platform 20 is the worker 3 or not, the work efficiency of the handling work decreases due to the temporary interruption of the work of the worker 3 and the like. Therefore, in the present embodiment, the worker discrimination unit 81 discriminates whether the person around the load receiving platform 20 is the worker 3 or the non-worker 4, and the area determination unit 83 discriminates in which area the person is located. Based on these discrimination results, the load receiving platform movement control unit 84 permits or prohibits the movement of the load receiving platform 20 by the load receiving platform lifting mechanism 30. Further, when the discrimination results of the worker discrimination unit 81 and the area determination unit 83 become a predetermined result, the notification device 78 gives a notification. Hereinafter, with reference to FIGS. 11 to 14, how the load receiving platform movement control unit 84 controls the load receiving platform lifting device 16 based on the discrimination results of the worker discrimination unit 81 and the area determination unit 83 will be described. Also, when the discrimination results of the worker discrimination unit 81 and the area determination unit 83 become what kind of results, the notification device 78 will give a notification will also be described. The dashed-dotted lines in FIGS. 11 to 14 represent the boundary lines of the respective areas.

[0069] As shown in Fig. 11, when a non-operator 4 enters the first area A1 and it is determined by the operator discrimination unit 81 and the area determination unit 83 that there is a non-operator 4 in the first area A1, the load receiving platform movement control unit 84 prohibits the movement of the load receiving platform 20 by the load receiving platform lifting mechanism 30. That is, the load receiving platform movement control unit 84 makes the load receiving platform lifting device 16 in a state where the operator 3 cannot move the load receiving platform 20 even if the operator 3 operates the operating device 50 or the wireless device 90. Further, when it is determined by the operator discrimination unit 81 and the area determination unit 83 that there is a non-operator 4 in the first area A1, the notification device 78 emits a warning sound to notify the non-operator 4 who has entered the first area A1. On the other hand, when only the operator 3 is in the first area A1 and it is determined by the operator discrimination unit 81 and the area determination unit 83 that only the operator 3 is in the first area A1, the load receiving platform movement control unit 84 permits the movement of the load receiving platform 20 by the load receiving platform lifting mechanism 30. That is, even if the operator 3 is in the first area A1, the operator 3 can operate the operating device 50 or the wireless device 90 to move the load receiving platform 20. Also, when it is determined by the operator discrimination unit 81 and the area determination unit 83 that only the operator 3 is in the first area A1, the notification device 78 does not perform notification.

[0070] As shown in Fig. 12, when the operator 3 is in the second area A2 and it is determined by the operator discrimination unit 81 and the area determination unit 83 that there is an operator 3 in the second area A2, the load receiving platform movement control unit 84 prohibits the movement of the load receiving platform 20 by the load receiving platform lifting mechanism 30. The notification device 78 emits a warning sound to notify the operator 3 who has entered the second area A2. Similarly, even if there is a non-operator 4 in the second area A2, the load receiving platform movement control unit 84 prohibits the movement of the load receiving platform 20 by the load receiving platform lifting mechanism 30. The notification device 78 emits a warning sound to notify the non-operator 4 who has entered the second area A2. Therefore, if a person is detected regardless of whether the person in the second area A2 is the operator 3 or not, the load receiving platform movement control unit 84 prohibits the movement of the load receiving platform 20 by the load receiving platform lifting mechanism 30. Also, if a person is detected regardless of whether the person in the second area A2 is the operator 3 or not, the notification device 78 performs notification.

[0071] As shown in FIG. 13, when a non-operator 4 enters the third area A3 and it is determined by the operator discrimination unit 81 and the area determination unit 83 that there is a non-operator 4 in the third area A3, the loading platform movement control unit 84 prohibits the movement of the loading platform 20 by the loading platform lifting mechanism 30. Further, the notification device 78 emits a warning sound to notify the non-operator 4 who has entered the third area A3. On the other hand, when only the operator 3 is in the third area A3 and it is determined by the operator discrimination unit 81 and the area determination unit 83 that only the operator 3 is in the third area A3, the loading platform movement control unit 84 permits the movement of the loading platform 20 by the loading platform lifting mechanism 30. Also, when it is determined by the operator discrimination unit 81 and the area determination unit 83 that only the operator 3 is in the first area A1, the notification device 78 does not perform notification.

[0072] As shown in FIG. 14, when the operator 3 is in the fourth area A4 and it is determined by the operator discrimination unit 81 and the area determination unit 83 that the operator 3 is in the fourth area A4, the loading platform movement control unit 84 prohibits the movement of the loading platform 20 by the loading platform lifting mechanism 30. The notification device 78 emits a warning sound to notify the operator 3 who has entered the fourth area A4. Similarly, even when a non-operator 4 is in the fourth area A4, the loading platform movement control unit 84 prohibits the movement of the loading platform 20 by the loading platform lifting mechanism 30. The notification device 78 emits a warning sound to notify the non-operator 4 who has entered the fourth area A4. Therefore, regardless of whether the person detected in the fourth area A4 is the operator 3 or not, the loading platform movement control unit 84 prohibits the movement of the loading platform 20 by the loading platform lifting mechanism 30, and the notification device 78 performs notification. That is, when a person is on the loading platform 20, the loading platform movement control unit 84 prohibits the movement of the loading platform 20 by the loading platform lifting mechanism 30, and the notification device 78 performs notification.

[0073] The operation of the load receiving platform lifting device 16 will be described below. To operate the load receiving platform lifting device 16, the operator 3 may operate the operation unit 51 or the wireless device 90. Here, the operation when the load receiving platform 20 is lifted will be described. That is, the operator 3 is operating the operation unit 51 to lift the load receiving platform 20 or pressing the up button 92 of the wireless device 90. Note that the imaging device 41 and the sensor 42 are operating regardless of whether the load receiving platform 20 is moving or stopped. Also, when the discrimination results by the operator discrimination unit 81 and the area determination unit 83 are the above results, the notification device 78 is configured to perform notification regardless of whether the load receiving platform 20 is moving or stopped.

[0074] In the state shown in FIG. 8, the load receiving platform 20 has descended to the lowermost end of the lifting range, and furthermore, the tip portion 21b of the load receiving platform main body 21 is in contact with the ground. At this time, the lift cylinder 35 and the gate cylinder 22a are in the most contracted state. At this time, the tilt link 31 is rotating in a direction away from the support member 18, that is, the lower end portion of the tilt link 31 is rotating backward. In this state, when hydraulic oil is supplied from the hydraulic circuit 70 (see FIG. 9) to the lift cylinder 35, the lift cylinder 35 extends. When the lift cylinder 35 extends, the lower portion of the tilt link 31 rotates in a direction to contact the support member 18, and the lift arm 32 moves forward. The load receiving platform 20 rotates upward about the pin P6.

[0075] As shown in FIG. 5, when the lift arm 32 moves forward until the tilt link 31 contacts the support member 18, the load receiving platform main body 21 faces upward and becomes horizontal. In this state, when further hydraulic oil is supplied from the hydraulic circuit 70 to the lift cylinder 35 and the lift cylinder 35 extends, the lift arm 32 rotates upward about the pin P2, and the compression arm 33 rotates upward about the pin P3. As a result, the load receiving platform 20 rises.

[0076] As shown in FIG. 3, when the load receiving platform 20 rises to the position at the upper end of the lifting range, the load receiving platform 20 and the load box 15 are flush. Specifically, the upper surface of the load receiving platform body 21 and the floor surface inside the load box 15 are flush. Here, being flush means that the heights of the upper surface of the load receiving platform body 21 and the floor surface inside the load box 15 are substantially equal. The fact that the heights of the upper surface of the load receiving platform body 21 and the floor surface inside the load box 15 are substantially equal includes both the case where they are completely equal and the case where there is a slight height difference between them. It is preferable that there is substantially no gap between the upper surface of the load receiving platform body 21 and the floor surface inside the load box 15 when they are flush. The fact that there is substantially no gap between the upper surface of the load receiving platform body 21 and the floor surface inside the load box 15 includes both the case where there is completely no gap between them and the case where there is a slight gap (see FIG. 3).

[0077] In the state where the upper surface of the load receiving platform body 21 and the floor surface inside the load box 15 are flush (the state in FIG. 3), the operator 3 may carry out the unloading of the goods from the load box 15 or the loading of the goods into the load box 15. For example, when unloading the goods, first, the goods are placed on the load receiving platform 20 from inside the load box. At this time, since the upper surface of the load receiving platform body 21 and the floor surface inside the load box 15 are flush, the operator 3 can easily perform the operation of placing the goods on the load receiving platform 20 from inside the load box. For example, in the case of goods with casters, the operator 3 can easily move the goods from the load box 15 to the load receiving platform 20 just by pushing or pulling the goods from the load box 15 towards the load receiving platform 20. Then, as shown in FIGS. 5 and 8, the lift cylinder 35 is extended to lower the load receiving platform 20.

[0078] On the other hand, in the state of FIG. 3, by further operating the lifting operation unit 51 or pressing the lifting button 92 of the wireless device 90, hydraulic oil is supplied from the hydraulic circuit 70 to the gate cylinder 22a. When hydraulic oil is supplied to the gate cylinder 22a, the gate cylinder 22a extends. When the gate cylinder 22a extends, the load receiving table 20 rotates counterclockwise about the pin P6. As shown in FIG. 4, when the gate cylinder 22a extends, the load receiving table body 21 faces the load box 15, and the load receiving table 20 is in an upright state. At this time, the gate cylinder 22a is in the most extended state.

[0079] When moving the load receiving table 20 as described above, for example, as shown in FIG. 11, when a non-operator 4 enters the first area A1, the imaging device 41 images the non-operator 4, and it is detected that a person has entered the periphery of the load receiving table 20. Based on the image captured by the imaging device 41, the operator determination unit 81 determines whether the person who has entered the periphery of the load receiving table 20 is the operator 3. At the same time, the area determination unit 83 determines in which area the person who has entered the periphery of the load receiving table 20 is located. Here, since it is determined that the non-operator 4 has entered the first area A1, the load receiving table movement control unit 84 stops the movement of the load receiving table 20, and the notification device 78 issues a notification. As a result, the non-operator 4 who has entered the first area A1 is prevented from coming into contact with the moving load receiving table 20.

[0080] Similarly, when a non-worker 4 enters the third area A3 as shown in FIG. 13, or when a worker 3 or a non-worker 4 enters the fourth area A4 as shown in FIG. 14, the imaging device 41 captures an image of the worker 3 or the non-worker 4. Based on the image captured by the imaging device 41, the worker discrimination unit 81 discriminates whether the person who has entered the periphery of the loading platform 20 is the worker 3. At the same time, the area determination unit 83 discriminates in which area the person who has entered the periphery of the loading platform 20 is located. Based on these discrimination results, the loading platform movement control unit 84 stops the movement of the loading platform 20, and the notification device 78 issues a notification. As described above, when the area determination unit 83 detects that there is a person in the fourth area A4, the movement of the loading platform 20 is stopped regardless of whether the person is the worker 3, and the notification device 78 issues a notification. Therefore, if the area determination unit 83 determines that there is a person in the fourth area A4, it is not always necessary for the worker discrimination unit 81 to discriminate whether the person is the worker 3.

[0081] Also, when the loading platform 20 is being moved, if a person enters the second area A2 as shown in FIG. 12, the sensor 42 detects that a person has entered the second area A2. As described above, when a person is detected by the sensor 42, the area determination unit 83 discriminates that the person who has entered is in the second area A2. Also, as described above, when a person enters the second area A2, the movement of the loading platform 20 is stopped regardless of whether the person who has entered is the worker 3, and the notification device 78 issues a notification. Therefore, the worker discrimination unit 81 does not discriminate whether the person who has entered is the worker 3, the movement of the loading platform 20 is stopped, and the notification device 78 issues a notification.

[0082] Also, before performing the handling operation, if a non-operator 4 has entered the first area A1, for example, before the operator 3 operates the loading platform lifting device 16, the notification device 78 gives a notification. Thereby, it is possible to prompt the non-operator 4 to retreat from the first area A1. Further, the operator 3 can also recognize that the non-operator 4 is present in the first area A1, and it is also possible to prompt the operator 3 to prompt the non-operator 4 to retreat from the first area A1. Note that, similarly for the second area A2, the third area A3, and the fourth area A4, even if the non-operator 4 has entered before performing the handling operation, the notification device 78 gives a notification.

[0083] The loading platform lifting device 16 according to the present embodiment includes a loading platform 20, a loading platform lifting mechanism 30 that raises and lowers the loading platform 20, a detection device 40 that detects a person on or around the loading platform 20, and a control device 80 that controls the loading platform lifting mechanism 30. The control device 80 includes an operator determination unit 81 and a loading platform movement control unit 84. The operator determination unit 81 determines whether the person detected by the detection device 40 is the operator 3. When the person detected in the first area A1 or the third area A3 is determined to be the operator 3 by the operator determination unit 81, the loading platform movement control unit 84 permits the movement of the loading platform 20 by the loading platform lifting mechanism 30, and when it is determined to be the non-operator 4 by the operator determination unit 81, prohibits the movement of the loading platform 20 by the loading platform lifting mechanism 30. Thereby, since the loading platform lifting mechanism 30 can be controlled by distinguishing between the operator 3 and the non-operator 4, the safety is high even for the non-operator 4, and a decrease in the efficiency of the handling operation can also be suppressed.

[0084] According to the present embodiment, the control device 80 further includes an area setting unit 82, an area determination unit 83, and a loading platform movement control unit 84. The area setting unit 82 divides and sets the periphery of the loading platform 20 into a plurality of areas. The area determination unit 83 determines in which area the operator 3 or the non-operator 4 detected by the detection device 40 is located. The loading platform movement control unit 84 permits or prohibits the movement of the loading platform 20 by the loading platform lifting mechanism 30 based on the determination result of the area determination unit 83. Thereby, the loading platform lifting mechanism 30 can be controlled based on in which area the operator 3 and the non-operator 4 are located.

[0085] According to this embodiment, the load receiving platform lifting device 16 is provided with a notification device 78. When a person detected in the first area A1 or the third area A3 is determined to be a non-worker 4 by the worker determination unit 81, the notification device 78 gives a notification. Thereby, when a non-worker 4 intrudes into the first area A1 or the third area A3, it is possible to prompt the non-worker 4 to retreat from the area. Further, the worker 3 can also recognize that the non-worker 4 has intruded into the first area A1 or the third area A3. Thereby, it is also possible for the worker 3 to prompt the non-worker 4 to retreat from the area. Further, even if the non-worker 4 has intruded into the first area A1 or the third area A3 before the handling work is performed, the worker 3 can notice the intrusion of the non-worker 4 before operating the load receiving platform lifting device 16. Thereby, it is possible to improve the safety for the non-worker 4 while suppressing a decrease in the efficiency of the handling work.

[0086] According to this embodiment, the control device 80 further includes an area setting unit 82, an area determination unit 83, and a load receiving platform movement control unit 84. The area setting unit 82 divides and sets the periphery of the load receiving platform 20 into a plurality of areas. The area determination unit 83 determines in which area the worker 3 or the non-worker 4 detected by the detection device 40 is located. The notification device 78 gives a notification when the determination results of the worker determination unit 81 and the area determination unit 83 become a predetermined result. Thereby, when a non-worker 4 intrudes into the periphery of the load receiving platform 20, or when the worker 3 intrudes into the second area A2 or the fourth area A4 where safety is prioritized over work efficiency, the notification device 78 gives a notification. Therefore, the safety for both the worker 3 and the non-worker 4 is high.

[0087] According to this embodiment, the area determination unit 83 sets the sides and rear of the loading platform 20 as the first area A1. When the detection device 40 detects only the worker 3 in the first area A1, the loading platform movement control unit 84 permits the movement of the loading platform 20 by the loading platform lifting mechanism 30. Also, when the detection device 40 detects a non-worker 4 in the first area A1, the loading platform movement control unit 84 prohibits the movement of the loading platform 20 by the loading platform lifting mechanism 30, and the notification device 78 issues a notification. Thereby, when a non-worker 4 approaches from the side or rear of the loading platform 20, the movement of the loading platform 20 stops, and the notification device 78 issues a notification. Therefore, the non-worker 4 does not come into contact with the moving loading platform 20. Also, since the worker 3 can move the loading platform 20 even when the worker 3 is on the side or rear of the loading platform 20, the efficiency of the loading work does not decrease.

[0088] According to this embodiment, the area determination unit 83 sets the area below the loading platform 20 as the second area A2. When the detection device 40 detects the worker 3 or the non-worker 4 in the second area A2, the loading platform movement control unit 84 prohibits the movement of the loading platform 20 by the loading platform lifting mechanism 30, and the notification device 78 issues a notification. Thereby, when there is a person below the loading platform 20, the loading platform 20 does not move, and the notification device 78 issues a notification, so that the worker 3 or the non-worker 4 does not come into contact with the moving loading platform 20.

[0089] According to this embodiment, the area determination unit 83 sets the inside of the loading box 15 as the third area A3. When the detection device 40 detects only the worker 3 in the third area A3, the loading platform movement control unit 84 permits the movement of the loading platform 20 by the loading platform lifting mechanism 30. Also, when the detection device 40 detects a non-worker 4 in the third area A3, the loading platform movement control unit 84 prohibits the movement of the loading platform 20 by the loading platform lifting mechanism 30, and the notification device 78 issues a notification. Thereby, when there is a non-worker 4 inside the loading box 15, the loading platform 20 does not move and the notification device 78 issues a notification, so that the non-worker 4 does not come into contact with the moving loading platform 20. Also, since the worker 3 can move the loading platform 20 even when the worker 3 is inside the loading box 15, the efficiency of the loading work does not decrease.

[0090] According to this embodiment, the area determination unit 83 sets the upper part of the loading platform 20 as the fourth area A4. When the detection device 40 detects the operator 3 or the non-operator 4 in the fourth area A4, the loading platform movement control unit 84 prohibits the movement of the loading platform 20 by the loading platform lifting mechanism 30, and the notification device 78 gives a notification. That is, when a person is on the loading platform 20, the notification device 78 gives a notification and the loading platform 20 does not move. Thereby, the operator 3 or the non-operator 4 does not come into contact with the moving loading platform 20.

[0091] According to this embodiment, the detection device 40 includes an imaging device 41 that images the loading platform 20 and the surroundings of the loading platform 20. Further, the operator discrimination unit 81 discriminates whether or not the person detected from the image captured by the imaging device 41 is the operator 3. Thereby, it is possible to discriminate whether or not the detected person is the operator 3 with a relatively simple configuration.

[0092] According to this embodiment, the operator discrimination unit 81 discriminates that the person imaged by the imaging device 41 is the operator 3 when wearing the protective gear 5, and discriminates that the person is the non-operator 4 when not wearing the protective gear 5. Thereby, it is possible to satisfactorily discriminate whether or not the detected person is the operator 3.

[0093] According to this embodiment, the control device 80 has a storage unit 85 that stores the detection information by the detection device 40. By storing the detection information, it is possible to confirm whether or not inappropriate work has been performed after the completion of the cargo handling work.

[0094] According to this embodiment, the loading platform lifting device 16 is provided with a transmission device 75 that transmits the detection information to the outside. Thereby, the working status can be confirmed in real time even from a remote location. Also, even if cargo handling work is being performed at a plurality of locations simultaneously, these cargo handling operations can be confirmed collectively. Therefore, it is highly convenient for the administrator who manages the cargo handling work.

[0095] As described above, an embodiment of the present invention has been described, but the above embodiment is merely an example. Various other embodiments are possible.

[0096] As shown in FIG. 15, when loading and unloading luggage on the truck bed 100, the work is carried out such that the loading platform 20 serves as a transfer board between the floor of the luggage compartment 15 and the floor of the truck bed 100. The area setting unit 82 may set the area behind the loading platform 20 at a height equal to or higher than the floor of the luggage compartment 15 as the fifth area A5. Specifically, the fifth area A5 may be set as an area within a predetermined distance (for example, 1 m) behind the loading platform 20. When transporting luggage between the luggage compartment 15 and the truck bed 100, it is not necessary to raise and lower the loading platform 20. Therefore, when the loading platform 20 and the floor of the luggage compartment 15 are at the same height and the detection device 40 detects the operator 3 or the non-operator 4 in the fifth area A5, the loading platform movement control unit 84 may prohibit the movement of the loading platform 20 by the loading platform lifting mechanism 30. Also, at this time, notification by the notification device 78 may be performed simultaneously. Thereby, it is possible to prevent the operator 3 or the non-operator 4 from coming into contact with the moving loading platform 20. Also, it is possible to prevent the operator from falling from the step generated between the truck bed 100 and the luggage compartment 15 due to the movement of the loading platform 20.

[0097] When the discrimination results of the operator discrimination unit 81 and the area determination unit 83 in the above embodiment became a predetermined result, the loading platform movement control unit 84 prohibited the movement of the loading platform 20 and the notification device 78 also performed notification. However, it is not always necessary to perform both the prohibition of the movement of the loading platform 20 by the loading platform movement control unit 84 and the notification by the notification device 78, and only one of them may be performed. That is, when the discrimination results of the operator discrimination unit 81 and the area determination unit 83 become a predetermined result, it is also possible to perform only the prohibition of the movement of the loading platform 20 by the loading platform movement control unit 84 without performing notification by the notification device 78. In this case, the loading platform lifting device 16 may not include the notification device 78. Also, when the discrimination results of the operator discrimination unit 81 and the area determination unit 83 become a predetermined result, it is also possible to perform only the notification by the notification device 78 without performing the control to prohibit the movement of the loading platform 20 by the loading platform movement control unit 84.

[0098] The configuration of the load receiving platform lifting device 16 is not limited to only the above-described embodiment. For example, in the above-described embodiment, when the load receiving platform lifting device 16 is not used, the load receiving platform lifting device 16 is configured such that the load receiving platform 20 is in an upright state. However, alternatively, the load receiving platform 20 may be stored under the load box 15. Further, the load receiving platform lifting mechanism 30 is not limited to the link mechanism as in the above-described embodiment. For example, the load receiving platform lifting mechanism 30 may include a pair of left and right columns extending in the vertical direction provided at the rear part of the load box 15, and a slider that moves up and down along the columns together with the load receiving platform. Also, along with the change in the configuration of the load receiving platform lifting device 16, the type and arrangement of the detection device 40 can be appropriately changed.

[0099] The type of the special vehicle 10 is not limited to only the above-described embodiment and is not particularly limited. For example, the special vehicle 10 may be a so-called flat body type vehicle provided with a load platform having an open upper part instead of the load box 15. Also, along with the change in the type of the special vehicle 10, the type and arrangement of the detection device 40 can be appropriately changed.

Explanation of Reference Numerals

[0100] 3 Operator 4 Non-operator 5 Protective gear 10 Special vehicle 12 Chassis 15 Load box 16 Load receiving platform lifting device 20 Load receiving platform 30 Load receiving platform lifting mechanism 40 Detection device 41 Imaging device 75 Transmitting device 78 Notification device 80 Control device 81 Operator discrimination unit 82 Region setting unit 83 Region determination unit 84 Load receiving platform movement control unit 85 Storage unit

Claims

1. A load receiving platform lifting device provided at the rear of the load box of a special vehicle, comprising: a load receiving platform; a load receiving platform lifting mechanism for lifting the load receiving platform; a detection device for detecting a person on or around the load receiving platform; a control device for controlling the load receiving platform lifting mechanism, wherein the control device comprises an operator discrimination unit that discriminates whether a person detected by the detection device is an operator based on predetermined discrimination conditions; and a load receiving platform movement control unit that permits movement of the load receiving platform by the load receiving platform lifting mechanism when the person discriminated by the operator discrimination unit is the operator, and prohibits movement of the load receiving platform by the load receiving platform lifting mechanism when the person discriminated by the operator discrimination unit is not the operator.

2. The control device further comprises a region setting unit that divides and sets the periphery of the load receiving platform into a plurality of regions; and a region determination unit that determines in which of the plurality of regions a person detected by the detection device is located. The load receiving platform movement control unit permits or prohibits movement of the load receiving platform by the load receiving platform lifting mechanism based on the discrimination result of the operator discrimination unit and the determination result of the region determination unit. The load receiving platform lifting device according to claim 1.

3. The region setting unit sets the sides and rear of the load receiving platform as a first region. The load receiving platform movement control unit permits movement of the load receiving platform by the load receiving platform lifting mechanism when a person detected by the detection device is discriminated as the operator by the operator discrimination unit and is determined to be in the first region by the region determination unit; and prohibits movement of the load receiving platform by the load receiving platform lifting mechanism when a person detected by the detection device is discriminated as a person other than the operator by the operator discrimination unit and is determined to be in the first region by the region determination unit. The load receiving platform lifting device according to claim 2.

4. The region setting unit sets the area below the load receiving platform as a second region. The load receiving platform movement control unit prohibits movement of the load receiving platform by the load receiving platform lifting mechanism when a person detected by the detection device is discriminated as the operator or a person other than the operator by the operator discrimination unit and is determined to be in the second region by the region determination unit. The load receiving platform lifting device according to claim 2.

5. The region setting unit sets the inside of the load box as a third region. The load receiving platform movement control unit: When the person detected by the detection device is determined to be the operator by the operator determination unit and is determined to be in the third area by the area determination unit, the movement of the load receiving platform by the load receiving platform lifting mechanism is permitted. The load receiving platform lifting device according to claim 2, wherein when the person detected by the detection device is determined to be a person other than the operator by the operator determination unit and is determined to be in the third area by the area determination unit, the movement of the load receiving platform by the load receiving platform lifting mechanism is prohibited.

6. The area setting unit sets the area above the load receiving platform as the fourth area. The load receiving platform lifting device according to claim 2, wherein when the person detected by the detection device is determined to be the operator or a person other than the operator by the operator determination unit and is determined to be in the fourth area by the area determination unit, the movement of the load receiving platform by the load receiving platform lifting mechanism is prohibited.

7. The area setting unit sets the area at a height equal to or higher than that of the load box and behind the load receiving platform as the fifth area. The load receiving platform lifting device according to claim 2, wherein when the load receiving platform and the floor of the load box are at the same height, and the person detected by the detection device is determined to be the operator or a person other than the operator by the operator determination unit and is determined to be in the fifth area by the area determination unit, the movement of the load receiving platform by the load receiving platform lifting mechanism is prohibited.

8. A load receiving platform lifting device provided at the rear part of the load box of a special vehicle, comprising: A load receiving platform; A load receiving platform lifting mechanism for lifting the load receiving platform; A detection device for detecting a person on or around the load receiving platform; A control device including an operator determination unit for determining whether the person detected by the detection device is an operator based on predetermined determination conditions; A load receiving platform lifting device, further comprising a notification device for performing notification when the person determined by the operator determination unit is not the operator.

9. The control device: Further comprises an area setting unit for dividing and setting the periphery of the load receiving platform into a plurality of areas; And an area determination unit for determining in which area among the plurality of areas the person detected by the detection device is located. The notification device is the loading platform lifting device according to claim 8, which performs notification when the discrimination result by the operator discrimination unit and the discrimination result of the area determination unit become predetermined results.

10. A loading platform lifting device provided at the rear part of a loading box of a special vehicle, comprising: A loading platform; A loading platform lifting mechanism for lifting the loading platform; A detection device for detecting an operator on or around the loading platform; A control device for controlling the loading platform lifting mechanism, The control device includes: An area setting unit that divides and sets the periphery of the loading platform into a plurality of areas; An area determination unit that determines in which area among the plurality of areas the operator detected by the detection device is located; A loading platform movement control unit that permits or prohibits the movement of the loading platform by the loading platform lifting mechanism based on the determination result of the area determination unit.

11. The detection device is an imaging device that images the loading platform and the periphery of the loading platform, The operator discrimination unit discriminates whether the detected person is the operator based on the image captured by the imaging device, according to the loading platform lifting device described in claim 1 or 8.

12. The operator discrimination unit: Discriminates whether the person detected by the imaging device is wearing protective gear; When the person detected by the imaging device is wearing protective gear, determines that the person detected by the imaging device is the operator; When the person detected by the imaging device is not wearing protective gear, determines that the person detected by the imaging device is a person other than the operator, according to the loading platform lifting device described in claim 11.

13. The control device has a storage unit that stores detection information by the detection device, according to the loading platform lifting device described in claim 1, 8 or 10.

14. The loading platform lifting device according to claim 13 is provided with a transmission device that transmits the detection information to the outside.

15. A special vehicle comprising the loading platform lifting device according to any one of claims 1, 8 or 10, And a loading box mounted on a chassis extending in the front-rear direction.

Images