Load receiving platform lifting device and vehicle

Abstract

To provide a cargo receiving platform lifting device and a vehicle dispensing with operation of a switch for connecting a battery and a motor when using a cargo receiving platform as a step after stopping the vehicle.SOLUTION: A load receiving platform lifting and lowering device attached below a load box includes a load receiving platform, a lifting and lowering mechanism configured to lift and lower the load receiving platform, a moving mechanism configured to move the load receiving platform between a storage position below the load box and a projecting position projecting outward from below the load box, a drive unit configured to drive the lifting and lowering mechanism and the moving mechanism, a battery configured to supply electric power to the drive unit, a door sensor configured to detect an opening / closing posture of a door portion of the load box, a control device configured to control the lifting and lowering mechanism and the moving mechanism, and a vehicle stop detection unit configured to detect a stop of a vehicle. When the stop of the vehicle is detected by the vehicle stop detection means, energization from the battery to the control device is started, and the control device connects the battery and the drive unit and moves the load receiving platform from the storage position toward the overhang position when the open posture of the door portion is detected during energization.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present application relates to a platform lifting device and a vehicle. [Background technology]

[0002] Patent Document 1 below discloses a vehicle equipped with a loading platform lifting device. This loading platform lifting device retracts and stores the loading platform under the loading platform when the vehicle is traveling, and pulls the loading platform out from under the loading platform during loading and unloading operations, lifting and lowering the loading platform between the floor level of the loading platform and the ground level.

[0003] When loading and unloading cargo using a platform lifting device, it is desirable to turn the key off and stop the engine after stopping the vehicle to prevent engine noise. At this time, by turning on a switch connecting the battery to a drive unit such as a motor, power is supplied from the battery to the drive unit, and the platform can be moved using the drive unit as a power source.

[0004] However, workers often desire to use a step to get onto the loading platform. For example, when a worker wants to use the loading platform as a step, the worker needs to operate a button, switch, or the like to extend the loading platform outward from under the loading platform. However, when the worker wants to use the loading platform as a step after stopping the vehicle, there is a problem in that it is cumbersome to turn on the switch that connects the battery and the drive unit. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6847559 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, the problem is to provide a loading platform lifting device and a vehicle that do not require the operation of a switch connecting the battery and the drive unit when the loading platform is to be used as a step after the vehicle has stopped. [Means for solving the problem]

[0007] The loading platform lifting device is a loading platform lifting device that is attached below a cargo box and comprises a loading platform, a lifting mechanism that raises and lowers the loading platform, a moving mechanism that moves the loading platform back and forth between a storage position below the cargo box and an extended position where it extends outward from below the cargo box, a drive unit for driving the lifting mechanism and the moving mechanism, a battery that can supply power to the drive unit, a door sensor that detects the open / closed position of the door of the cargo box, a control device that controls the lifting mechanism and the moving mechanism, and a vehicle stop detection means that detects the stop of a vehicle.When the vehicle stop detection means detects the stop of a vehicle, electricity is started to be supplied from the battery to the control device, and while electricity is being supplied, if the control device detects the open position of the door, it connects the battery and the drive unit and moves the loading platform from the storage position to the extended position.

[0008] The vehicle includes the loading platform lifting device and a vehicle body to which the loading platform lifting device is attached. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a side view of a main part of a vehicle according to an embodiment, showing a state in which the loading platform is located in a storage position; [Figure 2] FIG. 10 is a rear view of the main part of the vehicle according to the embodiment, showing a state in which the loading platform is located in a storage position. [Figure 3] FIG. 10 is a side view of the loading platform lifting device according to the embodiment, showing a state in which the loading platform is located at a lower end position. [Figure 4] FIG. 10 is a side view of the loading platform lifting device according to the embodiment, showing a state in which the loading platform is located at the upper end position; [Figure 5]FIG. 1 is a plan view of the loading platform lifting device according to the embodiment, showing a state in which the loading platform is located at a storage position; [Figure 6] FIG. 10 is a side view of the loading platform lifting device according to the embodiment, showing a state in which a part of the loading platform protrudes from under the loading box. [Figure 7] 1 is a hydraulic circuit diagram of the loading platform lifting device according to the embodiment; [Figure 8] Enlarged view of region VIII in Figure 2 [Figure 9] Cross section of Figure 2, line IX-IX [Figure 10] FIG. 2 is a control block diagram of the loading platform lifting device according to the embodiment; [Figure 11] 10A and 10B are side and front views of a changeover switch of the loading platform lifting / lowering device according to the embodiment; DETAILED DESCRIPTION OF THE INVENTION

[0010] In each drawing, the dimensions of the components may be enlarged or reduced relative to the actual dimensions, for example, to facilitate understanding, and the dimensional ratios between the drawings may not be consistent. Note that in each drawing, for example, to facilitate understanding, some of the components may be omitted.

[0011] Terms including ordinal numbers such as "first" and "second" are used to describe various components, but these terms are used only to distinguish one component from another, and the components are not particularly limited by these terms. The number of components including ordinal numbers is not particularly limited, and may be, for example, one. Furthermore, the ordinal numbers used in the following specification may differ from the ordinal numbers described in the claims.

[0012] In the following description, the first horizontal direction D1 is also referred to as the front-to-back direction, and the direction of the arrow in each drawing is the forward direction, and the direction opposite to the arrow in each drawing is the rearward direction. The second horizontal direction D2 is also referred to as the left-to-right direction, and the direction of the arrow in each drawing is the leftward direction, and the direction opposite to the arrow in each drawing is the rightward direction.

[0013] That is, each direction is the direction seen from the perspective of a person (driver) sitting in the driver's seat of the vehicle. Note that the terms front, back, left, and right are used for the sake of convenience of explanation, and in reality, the front and back may be reversed, the left and right may be reversed, or the front, back, left, and right may be swapped (rotated 90 degrees). Furthermore, the third direction D3 is the up-down direction D3.

[0014] An embodiment of a vehicle and a loading platform lifting / lowering device will be described below with reference to Figures 1 to 11. Note that the following embodiment is provided as an example to help understand the configuration of the vehicle and loading platform lifting / lowering device, and is not intended to limit the configuration of the vehicle and loading platform lifting / lowering device.

[0015] 1, a vehicle 1 includes, for example, a vehicle body 2 and a loading platform lifting device 3 attached to the vehicle body 2. The vehicle 1 is not particularly limited, and may be, for example, a cargo handling vehicle as in this embodiment. That is, the vehicle body 2 may include, for example, a body frame 2a and a cargo box 2b disposed at the rear end of the vehicle body 2 and on top of the body frame 2a as in this embodiment.

[0016] As shown in Fig. 2, the cargo box 2b may include a box portion 2d and a door portion 2e. The door portion 2e may be provided so as to close an opening at the rear of the box portion 2d. The cargo box 2b is loaded and unloaded by opening the door portion 2e. The door portion 2e is not particularly limited, but may include three doors 2f to 2h. The doors 2f and 2g are connected to the box portion 2d so as to be rotatable about an axis in the vertical direction D3, and the door 2h is connected to the door 2g so as to be rotatable about an axis in the vertical direction D3.

[0017] As shown in Figures 1 and 3, the loading platform lifting device 3 may include, for example, a loading platform 4 having a loading surface 4a, a base portion 5 attached to the vehicle frame 2a, a moving mechanism 6 that moves (slides) the loading platform 4 and the base portion 5 in the forward / backward direction D1, and a lifting mechanism 7 that raises and lowers the loading platform 4 (moves it in the up / down direction D3).

[0018] The receiving platform 4 may, for example, as in this embodiment, include a first receiving section 4b whose front end (base end) is connected to the lifting mechanism 7, and a second receiving section 4c that is disposed behind the first receiving section 4b and whose front end (base end) is rotatably connected to the rear end (tip end) of the first receiving section 4b. As a result, when the receiving platform 4 is not in use, the second receiving section 4c is folded so as to overlap the first receiving section 4b, as shown in FIG. 1.

[0019] On the other hand, when the receiving platform 4 is used, the second receiving section 4c is deployed so that the receiving surface 4a of the first receiving section 4b and the receiving surface 4a of the second receiving section 4c are flush with each other, as shown in Fig. 3. The number of receiving sections 4b, 4c is not particularly limited, and may be, for example, two as in this embodiment, or may be, for example, three or more, or may be, for example, only one.

[0020] A step 4d (see FIGS. 5 and 6) may be provided on the back surface (the surface opposite to the receiving surface 4a) of the second receiving portion 4c at the center in the left-right direction D2 of the front end (base end). The step 4d is an elongated member with a generally rectangular cross section.

[0021] The movement mechanism 6 may include, for example, a guide unit 6a that guides the base unit 5 in the front-rear direction D1, and a front-rear drive unit (lateral drive unit) 6b ​​(see FIG. 5) that moves the base unit 5 in the front-rear direction D1, as in this embodiment. The front-rear drive unit 6b is not particularly limited, but may be, for example, a motor, or, as in this embodiment, may be, for example, a slide cylinder 6b that can extend and retract in the front-rear direction D1. This causes the base unit 5 to move in the front-rear direction D1. The slide cylinder 6b is, for example, a hydraulic cylinder.

[0022] Therefore, when the receiving platform 4 is not in use, the receiving platform 4 and the base 5 are located in the storage position, which is the front end position, as shown in Fig. 1. In this way, the receiving platform 4 is made compact and stored under the cargo box 2b or the body frame 2a. On the other hand, when the receiving platform 4 is in use, the receiving platform 4 and the base 5 are located in the receiving position, which is the rear end position, as shown in Fig. 3.

[0023] 6, the receiving platform 4 and the base portion 5 may be positioned in a protruding position in which a portion of the receiving platform 4 protrudes outward (rearward) from below the cargo box 2b. In this protruding position, at least the step 4d protrudes outward from below the cargo box 2b, and a worker can use the step 4d as an aid when getting on to the cargo box 2b, for example.

[0024] 3 and 4, the lifting mechanism 7 may include, for example, first and second link units 8 and 9 connected to the receiving platform 4 and the base unit 5, and a lifting drive unit 10 that raises and lowers the receiving platform 4. This allows the receiving platform 4 to rise and lower from a lower end position as shown in FIG. 3 to an upper end position as shown in FIG. 4.

[0025] The lifting drive unit 10 is not particularly limited, but may be, for example, a motor, or, as in this embodiment, may be an extendable lift cylinder 10a. The lift cylinder 10a is, for example, a hydraulic cylinder. As in this embodiment, the lift cylinder 10a may include, for example, a first cylinder shaft 10b rotatably connected to the first link unit 8 and a second cylinder shaft 10c rotatably connected to the base unit 5.

[0026] The first link portion 8 may, for example, as in this embodiment, include a first load receiving shaft portion 8a rotatably connected to the load receiving platform 4 (specifically, the front end portion of the first load receiving portion 4b), and a first base shaft portion 8b rotatably connected to the base portion 5. For example, as in this embodiment, when viewed in the left-right direction D2, the first load receiving shaft portion 8a may be arranged at a first end portion of the first link portion 8, and the first base shaft portion 8b may be arranged at a second end portion of the first link portion 8.

[0027] Furthermore, the second link portion 9 may include, for example, as in this embodiment, a second load receiving shaft portion 9a rotatably connected to the load receiving platform 4 (specifically, the front end portion of the first load receiving portion 4b), and a second base shaft portion 9b rotatably connected to the base portion 5. For example, as in this embodiment, when viewed in the left-right direction D2, the second load receiving shaft portion 9a may be arranged at a first end portion of the second link portion 9, and the second base shaft portion 9b may be arranged at a second end portion of the second link portion 9.

[0028] As a result, the first link portion 8 and the second link portion 9 form a parallel link mechanism. Therefore, when the receiving platform 4 is raised or lowered by the first and second link portions 8, 9 rotating about the base shaft portions 8b, 9b, respectively, the receiving surface 4a is maintained in a horizontal position. Note that when the receiving platform 4 is located at the upper end position, the height of the receiving surface 4a of the receiving platform 4 may be adjusted to the height of the floor surface 2c of the box 2b, for example.

[0029] 5, the loading platform lifting / lowering device 3 may include a power unit 11 disposed at one end of the base portion 5 in the left-right direction D2. The power unit 11 includes a control device 20 (see FIG. 10) that controls the driving of the loading platform lifting / lowering device 3.

[0030] 7, the power unit 11 includes a tank 11a for storing hydraulic oil, a hydraulic pump 11b for sucking and discharging the hydraulic oil from the tank 11a, and a control valve 11c for adjusting the hydraulic pressure of the hydraulic oil supplied from the hydraulic pump 11b to each of the slide cylinder 6b and the lift cylinder 10a. The hydraulic pump 11b is driven to rotate by a motor 11d.

[0031] The control valve 11c is an assembly of multiple solenoid valves, multiple check valves, multiple throttle valves, etc. The control valve 11c is operated by the control device 20, and can control the operation of the slide cylinder 6b and the lift cylinder 10a by switching between supplying and discharging hydraulic oil to each of the slide cylinder 6b and the lift cylinder 10a.

[0032] The loading platform lifting device 3 may also include a switch box (not shown) disposed at the other end of the base 5 in the left-right direction D2. The switch box outputs an operation command to the control device 20 to lift, lower, or move (slide) the loading platform 4.

[0033] The loading platform lifting device 3 is equipped with a battery (not shown). The battery is disposed, for example, near the front of the vehicle body 2. The battery can be electrically connected to the power unit 11 via a contactor box (not shown). The battery can also be electrically connected to the control device 20.

[0034] 2 and 8, the receiving platform lifting device 3 may also include a door sensor 12 that detects the position of the door portion 2e of the container 2b. The door sensor 12 is not particularly limited, but may be arranged above the door 2h in the closed position to detect the position of the door 2h. The door sensor 12 is, for example, a non-contact proximity switch.

[0035] The door sensor 12 detects, for example, a detection bracket 12a provided at the upper end of the door 2h. The detection bracket 12a is a plate-shaped member extending upward from the upper end of the door 2h. As shown in FIG. 9, when the door 2h is in the closed position, the detection bracket 12a faces the door sensor 12 with a small gap between them. As a result, when the door sensor 12 detects the detection bracket 12a, the door 2h is in the closed position, and when the door sensor 12 does not detect the detection bracket 12a, the door 2h is in the open position. In this embodiment, the closed position of the door 2h is a position in which the door 2h is completely closed, and all other positions are open positions. In other words, the open position of the door 2h may be a position in which the door 2h is slightly open or a position in which the door 2h is completely open. The door sensor 12 transmits the detection result to the control device 20.

[0036] The loading platform lifting device 3 may also include a vehicle stop detection means 13 (see FIG. 10) that detects when the vehicle 1 has stopped. If the vehicle 1 is an automatic transmission vehicle, the vehicle stop detection means 13 may be, for example, a sensor that detects that the shift lever is in the P range, and if the vehicle 1 is a manual transmission vehicle, it may be, for example, a sensor that detects that the parking brake (side brake) has been applied. The vehicle stop detection means 13 transmits the detection result to the control device 20.

[0037] The receiving platform lifting device 3 may also include an extension position detection means 14 (see FIG. 10) that detects when the receiving platform 4 is in the extension position. The extension position detection means 14 may be, for example, a sensor that detects when the receiving platform 4 is in the extension position. As shown in FIG. 6, the extension position detection means 14 is, for example, a proximity switch provided on the guide portion 6a. In the example shown in FIG. 6, the extension position detection means 14 detects when the receiving platform 4 is in the extension position by detecting the base portion 5 that is in the extension position. The extension position detection means 14 transmits the detection result to the control device 20.

[0038] The receiving platform lifting device 3 may also include a storage position detection means 15 (see FIG. 10) that detects that the receiving platform 4 is located in the storage position. The storage position detection means 15 may be, for example, a sensor that detects the receiving platform 4 located in the storage position. The storage position detection means 15 is, for example, a proximity switch provided on the guide portion 6a as shown in FIG. 6. In the example shown in FIG. 6, the storage position detection means 15 detects that the receiving platform 4 is located in the storage position by detecting the base portion 5 located in the storage position. The storage position detection means 15 transmits the detection result to the control device 20.

[0039] The control device 20 controls the lifting mechanism 7 (specifically, the lift cylinder 10a) and the moving mechanism 6 (specifically, the slide cylinder 6b) based on the received detection results. The control device 20 sends an instruction to the slide cylinder 6b of the moving mechanism 6 (specifically, the control valve 11c that controls the operation of the slide cylinder 6b) based on at least the detection result of the door sensor 12.

[0040] When the vehicle stop detection means 13 detects that the vehicle 1 has stopped, the control device 20 starts to supply electricity from the battery. This enables the control device 20 to control the lifting mechanism 7 and the moving mechanism 6.

[0041] Furthermore, when the control device 20 detects the energization using, for example, an internal relay, it connects the battery to the motor 11d and starts energizing the motor 11d from the battery, thereby starting the operation of the motor 11d and the hydraulic pump 11b.

[0042] Furthermore, the receiving platform lifting / lowering device 3 may have a plurality of operating modes related to the operation of the receiving platform lifting / lowering device 3. The plurality of operating modes may include an interlocking mode in which the receiving platform 4 moves in the front-to-rear direction D1 in conjunction with the position of the door section 2e (specifically, the door 2h), and a non-interlocking mode in which the receiving platform 4 does not move in the front-to-rear direction D1 in conjunction with the position of the door section 2e (specifically, the door 2h). Furthermore, the non-interlocking mode may include an off mode and a lifting / lowering mode.

[0043] The loading platform lifting device 3 may be provided with a selection operation unit 16 that can select one operation mode from a plurality of operation modes. The selection operation unit 16 is, for example, a changeover switch as shown in FIG. 11. The changeover switch may be a double-pole double-throw switch. In the changeover switch shown in FIG. 11, the neutral position is the off mode, and switching it to the up position selects the linked mode, and switching it to the down position selects the lift mode. The selection operation unit 16 may be located, for example, in the driver's seat.

[0044] <Linked mode> When the interlocking mode is selected by the selection operation unit 16 and the vehicle stop detection means 13 detects that the vehicle has stopped, power supply from the battery to the control device 20 begins, and the interlocking mode is enabled.

[0045] When the interlocking mode is enabled, if the control device 20 receives a detection result from the door sensor 12 that the door 2h is in an open position, it electrically connects the battery to the motor 11d and further sends an instruction to the slide cylinder 6b to operate the receiving platform 4 backward. On the other hand, when the interlocking mode is enabled, if the control device 20 receives a detection result from the door sensor 12 that the door 2h is in a closed position, it sends an instruction to the slide cylinder 6b to operate the receiving platform 4 forward. In other words, the receiving platform 4 automatically moves in the forward-backward direction D1 in conjunction with the opening and closing of the door 2h. As a result, the worker can extend the receiving platform 4 from under the cargo box 2b by simply opening the door 2h without operating a button or switch, and can use the step 4d of this extending receiving platform 4 to ascend and descend. In addition, the worker can store the receiving platform 4 under the cargo box 2b by simply closing the door 2h.

[0046] Furthermore, when the interlocking mode is enabled and the storage position detection means 15 detects that the receiving platform 4 has moved to the storage position, the power supply from the battery to the control device 20 may be cut off. This prevents the receiving platform 4 from unintentionally starting to move toward the extended position and causing contact between the receiving platform 4 and the worker when the door 2h is opened again after the receiving platform 4 has moved to the storage position.

[0047] Furthermore, the power supply from the battery to the control device 20 may be cut off after a predetermined time has elapsed since the power supply was started. The predetermined time until the power supply is cut off may be set appropriately, for example, 1000 seconds. This prevents the battery from running out. In particular, if the storage position detection means 15 does not detect that the receiving platform 4 has moved to the storage position, power continues to be supplied from the battery to the control device 20, which may result in the battery running out.

[0048] <Off mode> When the off mode is selected by the selection operation unit 16, power to the control device 20 is cut off. When the off mode is selected, power is not supplied from the battery to the control device 20 even if the vehicle stop detection means 13 detects that the vehicle has stopped. As a result, the control device 20 does not control the moving mechanism 6. Therefore, it is possible to prevent the receiving platform 4 from sliding unintentionally when the door 2h is opened or closed.

[0049] <Lift mode> When the lift mode is selected by the selection operation unit 16 and the vehicle stop detection means 13 detects that the vehicle has stopped, power is supplied from the battery to the control device 20, and the lift mode is enabled. When power is supplied, the control device 20 electrically connects the battery and the motor 11d. This allows the worker to raise and lower the receiving platform 4 by, for example, operating a switch box. Furthermore, when the lift mode is selected by the selection operation unit 16, the control device 20 ignores the detection result of the door sensor 12. This allows the receiving platform 4 to not slide even when the door 2h is opened or closed, allowing the worker to raise and lower the receiving platform 4.

[0050] As described above, in this embodiment, the vehicle 1 includes the loading platform lifting / lowering device 3 and the vehicle body 2 to which the loading platform lifting / lowering device 3 is attached.

[0051] Further, as in this embodiment, the receiving platform lifting device 3 is a receiving platform lifting device 3 attached below the cargo box 2b, and includes a receiving platform 4, a lifting mechanism 7 for raising and lowering the receiving platform 4, a moving mechanism 6 for moving the receiving platform 4 in the front-rear direction D1 between a storage position below the cargo box 2b and an extension position where the receiving platform 4 extends outward from below the cargo box 2b, a drive unit (a motor in this embodiment) 11d for driving the lifting mechanism 7 and the moving mechanism 6, a battery capable of supplying power to the drive unit (a motor in this embodiment) 11d, and a battery for controlling the opening and closing states of the door portion 2e of the cargo box 2b. It is preferable that the control device 20 is provided with a door sensor 12 that detects the momentum of the door, a control device 20 that controls the lifting mechanism 7 and the moving mechanism 6, and a vehicle stop detection means 13 that detects the stop of the vehicle 1, and when the vehicle stop detection means 13 detects the stop of the vehicle 1, electricity is started to be supplied from the battery to the control device 20, and when the control device 20 detects the open position of the door portion 2e while electricity is being supplied, the control device 20 connects the battery to the drive unit (motor in this embodiment) 11d and moves the cargo receiving platform 4 from the stored position toward the extended position.

[0052] With this configuration, when an operator wants to use the cargo receiving platform 4 as a step after stopping the vehicle 1, he or she can simply open the door 2e without operating the switch that connects the battery and the drive unit (motor in this embodiment) 11d, causing the cargo receiving platform 4 to extend outward from under the cargo box 2b, and use this extended cargo receiving platform 4 as a step.

[0053] Furthermore, as in this embodiment, the receiving platform lifting device 3 is preferably configured to include a storage position detection means 15 that detects that the receiving platform 4 has moved to the storage position, and when the closed position of the door section 2e is detected, the control device 20 moves the receiving platform 4 from the extended position toward the storage position, and when the storage position detection means 15 detects that the receiving platform 4 has moved to the storage position, the power supply from the battery to the control device 20 is cut off.

[0054] According to this configuration, when the receiving platform 4 is moved to the storage position once and then the door section 2e is opened again, the receiving platform 4 can be prevented from unintentionally starting to move toward the extended position, which would cause contact between the receiving platform 4 and the worker.

[0055] Furthermore, as in this embodiment, it is preferable that the power supply from the battery to the control device 20 is cut off after a predetermined time has elapsed since the power supply was started.

[0056] With this configuration, it is possible to prevent the battery from running out.

[0057] The vehicle 1 and the platform lifting device 3 are not limited to the configurations of the above-described embodiment, and are not limited to the above-described effects. Furthermore, the vehicle 1 and the platform lifting device 3 can be modified in various ways without departing from the spirit of the present invention. For example, it is possible to arbitrarily select one or more of the configurations and methods according to the various modified examples described below and use them in the configurations and methods according to the above-described embodiment.

[0058] (1) In the receiving platform lifting / lowering device 3 according to the above embodiment, the door section 2e is configured to have three doors 2f to 2h. However, the receiving platform lifting / lowering device 3 is not limited to this configuration. For example, the door section 2e may be configured to have two doors that open like a double door.

[0059] (2) Furthermore, the receiving platform lifting / lowering device 3 according to the above embodiment is configured to include one door sensor 12. However, the receiving platform lifting / lowering device 3 is not limited to this configuration. For example, the receiving platform lifting / lowering device 3 may be configured to include multiple door sensors 12. In this case, the multiple door sensors 12 may each detect the position of the corresponding door 2f to 2h.

[0060] (3) Furthermore, in the loading platform lifting device 3, if the door section 2e is equipped with two doors that open like a folding screen, the door sensor 12 may detect only one of the left and right doors, or may detect both the left and right doors separately.

[0061] (4) Furthermore, when a door sensor 12 is provided for each of multiple doors, the control device 20 may extend the receiving platform 4 when it detects that at least one door is in an open position, or may extend the receiving platform 4 when it detects that all doors are in an open position.

[0062] (5) In the receiving platform lifting device 3 according to the above embodiment, the door sensor 12 is disposed above the door 2h in the closed position. However, the receiving platform lifting device 3 is not limited to this configuration. The door sensor 12 may be a sensor that rotates at least one of the doors 2f-2h to the side of the cargo box 2b and detects that the door has rotated to a predetermined position. In this case, the door sensor 12 may be a proximity switch provided on the side of the cargo box 2b. As a result, when the door sensor 12 detects the door 2f-2h (detection bracket 12a) to be detected, the door 2f-2h is in the open position. When the door sensor 12 does not detect the door 2f-2h (detection bracket 12a), the door 2f-2h is in the closed position. In other words, the open position of the doors 2f-2h is a position in which the doors 2f-2h are rotated to a position substantially parallel to the side of the cargo box 2b, and all other positions are closed positions.

[0063] (6) Furthermore, in the receiving platform lifting device 3 according to the above embodiment, when the receiving platform 4 is in the extended position, a portion of the receiving platform 4 extends outward from below the cargo box 2b. However, the receiving platform lifting device 3 is not limited to this configuration. For example, when the receiving platform 4 is in the extended position, the entire receiving platform 4 may extend outward from below the cargo box 2b. In this case, the receiving platform 4 does not need to be provided with the step 4d, and the entire second receiving portion 4c of the receiving platform 4 may be used as a step.

[0064] (7) In addition, in the receiving platform lifting device 3 according to the above embodiment, the step 4d is configured as a long member having a substantially rectangular cross section. However, the receiving platform lifting device 3 is not limited to this configuration. If the upper surface of the receiving platform 4 (in the above embodiment, the back surface of the second receiving portion 4c) is inclined relative to the ground surface in the extended position, it is preferable that the step 4d have a cross-sectional shape such that the upper surface is parallel to the ground surface. [Explanation of symbols]

[0065] 1...vehicle, 2...vehicle body, 2a...vehicle frame, 2b...packing box, 2c...floor surface, 2d...box section, 2e...door section, 2f-2h...door, 3...load receiving platform lifting device, 4...load receiving platform, 4a...load receiving surface, 4b...first load receiving section, 4c...second load receiving section, 4d...step, 5...base section, 6...moving mechanism, 6a...guide section, 6b...slide cylinder (front-rear drive section), 7...lifting mechanism, 8...first link section, 8a...first load receiving shaft section, 8b...first base shaft section, 9...second link section, 9a...second load receiving shaft section, 9b...second base shaft section, 10 ...Lifting drive unit, 10a...lift cylinder, 10b...first cylinder shaft, 10c...second cylinder shaft, 11...power unit, 11a...tank, 11b...hydraulic pump, 11c...control valve, 11d...motor, 12...door sensor, 12a...detection bracket, 13...vehicle stop detection means, 14...extension position detection means, 15...storage position detection means, 16...selection operation unit, 20...control device, D1...first lateral direction (front-back direction), D2...second lateral direction (left-right direction), D3...up-down direction

Claims

1. A loading platform lifting device attached below a loading box, A loading platform and a lifting mechanism for lifting and lowering the loading platform; a movement mechanism that moves the cargo receiving platform in the front-rear direction between a storage position under the cargo box and an extended position where the platform extends outward from under the cargo box; a drive unit for driving the lifting mechanism and the moving mechanism; a battery capable of supplying power to the drive unit; a door sensor that detects the opening and closing position of the door of the container; a control device that controls the lifting mechanism and the moving mechanism; a vehicle stop detection means for detecting a stop of the vehicle, When the vehicle stop detection means detects that the vehicle has stopped, power supply from the battery to the control device is started, The control device is a loading platform lifting device that, when powered, connects the battery to the drive unit and moves the loading platform from the storage position toward the extended position when the open position of the door unit is detected.

2. a storage position detection means for detecting that the loading platform has moved to the storage position; When the control device detects that the door section is in a closed position, the control device moves the loading platform from the extended position toward the stored position, 2. The loading platform lifting device according to claim 1, wherein when the storage position detection means detects that the loading platform has moved to the storage position, power supply from the battery to the control device is cut off.

3. 3. The loading platform lifting device according to claim 1, wherein the power supply from the battery to the control device is cut off after a predetermined time has elapsed since the power supply was started.

4. The loading platform lifting device according to claim 1 or 2; a vehicle body to which the loading platform lifting device is attached.

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