Load receiving platform lifting device and vehicle

Abstract

To provide a cargo receiving platform lifting device and a vehicle capable of safely moving a cargo receiving platform between a storage position and an overhang position without operating a button, a switch or the like.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 in a front-rear direction between a storage position below the load box and a projecting position projecting outward from below the load box, 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 moving mechanism based on a detection result of the door sensor, and an obstacle detection unit configured to detect an obstacle around the load receiving platform. The control device stops the movement of the load receiving platform when an obstacle is detected by the obstacle detection means while the load receiving platform is being moved toward the overhanging position.SELECTED DRAWING: Figure 9

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] However, workers often want to use steps to get onto the loading platform. For example, if a worker wants to use the loading platform as a step, the worker needs to operate a button or switch to move the loading platform outward from under the loading platform. Also, safety considerations must be taken into account when moving the loading platform. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6847559 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, the object is to provide a loading platform lifting device and a vehicle that can safely move the loading platform between a storage position and an extended position without operating buttons, switches, etc. [Means for solving the problem]

[0006] The receiving platform lifting device is a receiving platform lifting device that is attached below a cargo box and comprises a receiving platform, a lifting mechanism that raises and lowers the receiving platform, a moving mechanism that moves the receiving platform in the forward and backward directions between a storage position below the cargo box and an extended position where it extends outward from below the cargo box, a door sensor that detects the open / closed position of the door of the cargo box, a control device that controls the moving mechanism based on the detection results of the door sensor, and an obstacle detection means that detects obstacles around the receiving platform, and the control device stops the movement of the receiving platform if an obstacle is detected by the obstacle detection means while the receiving platform is being moved toward the extended position.

[0007] 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]

[0008] [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] Enlarged view of region VII in Figure 2 [Figure 8] Cross section of line VIII-VIII in Figure 2 [Figure 9] FIG. 2 is a perspective view of the loading platform lifting / lowering device according to the embodiment; [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

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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).

[0017] 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.

[0018] 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.

[0019] 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.

[0020] The receiving platform 4 may be equipped with an obstacle detection means for detecting obstacles around the receiving platform 4. As shown in FIG. 9, the obstacle detection means may be, for example, a contact sensor 30 that can detect an obstacle by contacting the obstacle. The contact sensor 30 is provided, for example, at the rear end of the first receiving section 4b or the second receiving section 4c when the second receiving section 4c is folded. The contact sensor 30 may also be provided on the rear end surface 4e of the first receiving section 4b, as in this embodiment. The contact sensor 30 in this embodiment is provided on substantially the entire rear end surface 4e of the first receiving section 4b in the left-right direction D2. Examples of the contact sensor 30 include a pressure sensor and a limit switch. For example, the contact sensor 30 outputs a signal indicating an ON state as a detection result when it detects contact with an obstacle, and outputs a signal indicating an OFF state as a detection result when it detects no contact with an obstacle.

[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, and may be, for example, a cylinder that can extend and retract in the front-rear direction D1 or a motor. This causes the base unit 5 to move in the front-rear direction D1.

[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, and may be, for example, a motor, or may be, for example, an extendable cylinder 10a as in this embodiment. The 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 as in this embodiment.

[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 receiving platform lifting device 3 may include a power unit 11 arranged at one end of the base 5 in the left-right direction D2. The power unit 11 includes a control device 20 (see FIG. 9) that controls the driving of the receiving platform lifting device 3. The receiving platform lifting device 3 may also include a switch box (not shown) arranged 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 raise / lower or move (slide) the receiving platform 4.

[0030] 2, 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 disposed 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.

[0031] 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. 8, 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.

[0032] The control device 20 includes a movement control unit 21 that controls the movement mechanism 6 based on the received detection results. The movement control unit 21 transmits instructions to the front-rear drive unit 6b of the movement mechanism 6 based on at least the detection results of the door sensor 12.

[0033] The receiving platform lifting / lowering device 3 may also 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 plurality of operating modes may include a lifting / lowering mode in which the lifting / lowering operation of the receiving platform 4 can be controlled.

[0034] 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. 10. The changeover switch may be a double-pole double-throw switch. In the changeover switch shown in FIG. 10, the neutral position is the non-interlocking mode, and switching it to the upper position selects the interlocking mode, and switching it to the lower position selects the lifting mode. The selection operation unit 16 may be located, for example, in the driver's seat.

[0035] <Linked mode> When the interlocking mode is selected by the selection operation unit 16, and the movement control unit 21 receives a detection result from the door sensor 12 that the door 2h is in an open position, the movement control unit 21 sends an instruction to the front-rear drive unit 6b to operate to move the receiving platform 4 backward. On the other hand, when the interlocking mode is selected by the selection operation unit 16, and the movement control unit 21 receives a detection result from the door sensor 12 that the door 2h is in a closed position, the movement control unit 21 sends an instruction to the front-rear drive unit 6b to operate to move the receiving platform 4 forward. In other words, the receiving platform 4 automatically moves in the front-rear direction D1 in conjunction with the opening and closing of the door 2h. This allows the worker to protrude the receiving platform 4 from under the cargo box 2b simply by opening the door 2h without operating a button, switch, or the like, and to use the step 4d of this protruding receiving platform 4 to ascend and descend. In addition, the worker can store the receiving platform 4 under the cargo box 2b simply by closing the door 2h.

[0036] Furthermore, if the contact sensor 30 detects an obstacle while the receiving platform 4 is being moved (rearward) toward the extended position, the movement control unit 21 stops the movement of the receiving platform 4. Obstacles include people and objects, people include workers and non-workers, and objects include baggage and pits where baggage is loaded and unloaded. This increases safety because the receiving platform 4 automatically stops even if it comes into contact with an obstacle while moving toward the extended position.

[0037] Furthermore, the movement control unit 21 may stop the movement of the receiving platform 4 and then move the receiving platform 4 toward the storage position (forward). This further enhances safety because even if the receiving platform 4 comes into contact with an obstacle, the receiving platform 4 automatically retreats forward.

[0038] <Non-linked mode> When the non-interlocking mode is selected by the selection operation unit 16, power to the movement control unit 21 is cut off. This prevents the movement control unit 21 from controlling the movement mechanism 6. This prevents the receiving platform 4 from sliding unintentionally when the door 2h is opened or closed.

[0039] <Lift mode> When the lifting mode is selected by the selection operation unit 16, the movement control unit 21 ignores the detection result of the door sensor 12. As a result, even if the door 2h is opened or closed, the receiving platform 4 does not slide, and the worker can raise or lower the receiving platform 4.

[0040] 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.

[0041] Furthermore, as in this embodiment, the receiving platform lifting device 3 is a receiving platform lifting device 3 that is attached below the cargo box 2b, and is equipped with a receiving platform 4, a lifting mechanism 7 that raises and lowers the receiving platform 4, a moving mechanism 6 that moves the receiving platform 4 in the forward and backward direction D1 between a storage position below the cargo box 2b and an extended position where it extends outward from below the cargo box 2b, a door sensor 12 that detects the open / closed position of the door portion 2e of the cargo box 2b, a control device 20 that controls the moving mechanism 6 based on the detection result of the door sensor 12, and an obstacle detection means (in this embodiment, a contact sensor 30) that detects obstacles around the receiving platform 4, and it is preferable that the control device 20 be configured to stop the movement of the receiving platform 4 if an obstacle is detected by the obstacle detection means (in this embodiment, the contact sensor 30) when the receiving platform 4 is being moved toward the extended position.

[0042] With this configuration, an operator can move the receiving platform 4 between the stored position and the extended position by simply opening and closing the door 2e, for example, without operating any buttons or switches. Furthermore, even if the receiving platform 4 comes into contact with an obstacle while moving toward the extended position, the receiving platform 4 will automatically stop, thereby increasing safety.

[0043] Furthermore, as in this embodiment, in the receiving platform lifting device 3, the receiving platform 4 comprises a first receiving section 4b whose base end is connected to the lifting mechanism 7, and a second receiving section 4c whose base end is rotatably connected to the tip end of the first receiving section 4b and which is folded so as to overlap the first receiving section 4b when moved, and it is preferable that the obstacle detection means is a contact sensor 30 provided at the rear end of the first receiving section 4b or the second receiving section 4c when the second receiving section 4c is folded.

[0044] With this configuration, it is possible to properly detect an obstacle that comes into contact with the loading platform 4 while it is moving backward.

[0045] Furthermore, in the loading platform lifting device 3 as in this embodiment, it is preferable that the control device 20 stops the movement of the loading platform 4 and then moves the loading platform 4 toward the storage position.

[0046] According to this configuration, even if the loading platform 4 comes into contact with an obstacle, the loading platform 4 automatically retreats forward, further improving safety.

[0047] 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.

[0048] (1) In the receiving platform lifting device 3 according to the above embodiment, the receiving platform 4 includes a first receiving section 4b whose base end is connected to the lifting mechanism 7, and a second receiving section 4c whose base end is rotatably connected to the tip of the first receiving section 4b and which is folded to overlap the first receiving section 4b when moved. The obstacle detection means is a contact sensor 30 provided at the rear end of the first receiving section 4b or the second receiving section 4c when the second receiving section 4c is folded. However, the receiving platform lifting device 3 is not limited to this configuration. The obstacle detection means may also be a non-contact sensor provided at the rear end of the first receiving section 4b or the second receiving section 4c when the second receiving section 4c is folded. Examples of non-contact sensors include ultrasonic sensors, infrared sensors, laser sensors, and image sensors.

[0049] (2) In the loading platform lifting device 3 according to the above embodiment, the contact sensor 30 is attached to the loading platform 4. However, the loading platform lifting device 3 is not limited to this configuration. The obstacle detection means may be a non-contact sensor, and the non-contact sensor may be attached to the vehicle body 2.

[0050] (3) In the receiving platform lifting device 3 according to the above embodiment, the contact sensor 30 is provided on the rear end surface 4e of the first receiving portion 4b. However, the receiving platform lifting device 3 is not limited to this configuration. For example, the contact sensor 30 may be provided on the rear end surface 4f of the second receiving portion 4c when the second receiving portion 4c is folded.

[0051] (4) 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.

[0052] (5) 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.

[0053] (6) 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.

[0054] (7) Furthermore, when a door sensor 12 is provided for each of multiple doors, the movement control unit 21 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.

[0055] (8) 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 door 2f-2h is a position in which the door 2f-2h is rotated to a position substantially parallel to the side of the cargo box 2b, and all other positions are closed positions.

[0056] (9) 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.

[0057] (10) When the control device 20 is switched to the lifting mode while the loading platform 4 is in the extended position, the control device 20 may move the loading platform 4 to the loading position (rear end position).

[0058] (11) Furthermore, when the control device 20 is switched to the interlocking mode while the loading platform 4 is in the lifted / lowered position, the control device 20 may move the loading platform 4 to the extended position.

[0059] (12) Furthermore, in the loading platform lifting device 3 according to the above embodiment, the movement control unit 21 is configured to be included in the control device 20. However, the loading platform lifting device 3 is not limited to this configuration. The movement control unit 21 may not be included in the control device 20, but may be separate from the control device 20.

[0060] (13) 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 such a 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 has a cross-sectional shape such that the upper surface is parallel to the ground surface. [Explanation of symbols]

[0061] DESCRIPTION OF SYMBOLS 1...vehicle, 2...vehicle body, 2a...vehicle frame, 2b...packing box, 2c...floor, 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, 4e...rear end surface of first load receiving section, 4f...rear end surface of second load receiving section, 5...base section, 6...moving mechanism, 6a...guide section, 6b...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 section, 10a...cylinder, 10b...first cylinder shaft section, 10c...second cylinder shaft section, 11...power unit, 12...door sensor, 12a...detection bracket, 16...selection operation section, 20...control device, 21...movement control section, 30...contact sensor (obstacle detection means), 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 door sensor that detects the opening and closing position of the door of the container; a control device that controls the movement mechanism based on the detection result of the door sensor; an obstacle detection means for detecting obstacles around the loading platform; The control device of the loading platform lifting device stops the movement of the loading platform if an obstacle is detected by the obstacle detection means while the loading platform is being moved toward the extended position.

2. The receiving platform includes a first receiving section having a base end connected to the lifting mechanism, and a second receiving section having a base end rotatably connected to a tip end of the first receiving section and being folded so as to overlap the first receiving section when moved; 2. The loading platform lifting device according to claim 1, wherein the obstacle detection means is a contact sensor provided at a rear end of the first loading platform or the second loading platform when the second loading platform is folded.

3. 3. The loading platform lifting device according to claim 1, wherein the control device stops the movement of the loading platform and then moves the loading platform toward the storage position.

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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