JP2024012210A - Cargo platform lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cargo platform lifting device that can inhibit decline of the workability in performing work of moving cargo between a cargo platform and a floor of a cargo box.

SOLUTION: A cargo platform lifting device 10 comprises: a cargo platform 11 on which cargo is placed to cause the cargo to be loaded into and unloaded from a cargo box 3 mounted on a vehicle body 2; a lifting mechanism 12 for raising and lowering the cargo platform 11 between a raised position T1 at the same height as a floor 3a of the cargo box 3 and a lowered position T2 in contact with the ground; a first detection unit 41 for detecting that the lift position of the cargo platform 11 is the raised position T1; a reporting unit 51 for reporting to an operator that the cargo platform 11 is at the raised position T1; and a control unit 52 that causes the reporting unit 51 to report while a detection signal is input from the first detection unit 41.

SELECTED DRAWING: Figure 7

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a loading platform elevating device.

2. Description of the Related Art An example of a loading platform elevating device that is attached to a truck or the like and used for loading and unloading cargo is disclosed in Patent Document 1, for example. The loading platform elevating device of Patent Document 1 includes a loading platform disposed behind a cargo box of a truck, and a lifting mechanism that raises and lowers the loading platform between a lowered position and a raised position. The loading platform is in contact with the ground in the lowered position, and is at the same height as the floor of the cargo box in the raised position.

Japanese Patent Application Publication No. 2020-199834

A worker may perform a moving operation in which, after raising the loading platform to a raised position using the lifting mechanism, the cart carrying the cargo is moved between the loading platform and the floor of the cargo box. However, if this moving work is performed when the receiving platform is at a position slightly lower than the raised position, the cart cannot be moved smoothly between the receiving platform and the floor of the cargo box, resulting in poor work efficiency. will decrease.

The present invention has been made in view of the above-mentioned problems, and provides a cargo receiving platform that can suppress a decrease in work efficiency when moving cargo between the receiving platform and the floor surface of a cargo box. The purpose is to provide a lifting device.

(1) The present invention provides a cargo receiving platform on which cargo is placed in order to load and unload cargo into a cargo box mounted on a vehicle body, and a cargo receiving platform that is located at the same height as the floor surface of the cargo box. a lifting mechanism for raising and lowering between a raised position and a lowered position where the loading platform is brought into contact with the ground; a first detection unit that detects that the lifting position of the load receiving platform is at the raised position; and a first detection unit that detects that the loading platform is in the raised position. This is a loading platform lifting/lowering device comprising: a notification section that notifies a worker of this; and a control section that causes the notification section to notify while a detection signal is being input from the first detection section.

According to the present invention, while the first detection unit detects that the loading platform is in the raised position at the same height as the floor surface of the cargo box, the control unit detects that the loading platform is in the raised position by the notification unit. Inform workers of this. This allows the worker to move the cargo between the floor of the cargo box and the receiving platform when the notification unit is giving the alarm, that is, when the receiving platform is at the same height as the floor of the cargo box. Able to perform work. As a result, it is possible to prevent the work of moving the cargo from being performed when the cargo receiving platform is located at a position lower than the floor surface of the cargo box, so it is possible to prevent the workability of the moving work from decreasing.

(2) In the loading platform elevating device according to (1), the loading mechanism includes a lifting mechanism that raises and rotates the loading platform between an upright position and a collapsed position when the loading platform is in the raised position; The controller further includes a second detection section that detects that the uphill posture is the lying down posture, and the control section receives both the detection signal of the first detection section and the detection signal of the second detection section. It is preferable that the notification section is made to notify the user while the user is away.
In this case, the control unit causes the notification unit to notify when the loading platform is in the raised position and the collapsed position, so if the loading platform is in the upright position but in the upright position, the notification unit will notify you. Never. Therefore, power consumption when the loading platform is in the upright position can be reduced.

(3) In the loading platform elevating device of (1) or (2), it is preferable that the notification section is provided within the loading box.
In this case, even if the worker is working inside the cargo box, he or she can easily know that the cargo receiving platform is in the raised position.

According to the present invention, it is possible to suppress a decrease in work efficiency when carrying out the work of moving cargo between the cargo receiving platform and the floor surface of the cargo box.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a freight vehicle equipped with a loading platform elevating device according to an embodiment of the present invention. FIG. 3 is an enlarged side view of the loading platform elevating device. FIG. 3 is a plan view of the loading platform elevating device. FIG. 3 is an exploded side view of the elevating mechanism. FIG. 3 is an enlarged side view showing the vicinity of the base of the cargo receiving platform. It is a perspective view seen from inside the cargo box rearward when the cargo receiving platform is in the raised position. FIG. 2 is a block diagram showing a control configuration of a loading platform lifting/lowering device. It is a flowchart which shows the control example of the notification part which a control part performs.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side view of a freight vehicle 1 provided with a loading platform elevating device 10 according to an embodiment of the present invention. The freight vehicle 1 includes a vehicle body 2, a cargo box 3 mounted on the vehicle body 2, and an opening/closing door 4 capable of opening and closing a rear opening of the cargo box 3. An operator can load and unload cargo from the rear opening of the cargo box 3 by opening the door 4. At the rear of the vehicle body 2, a so-called upright and retractable loading platform lifting device 10 is provided.

[Loading platform lifting device]
FIG. 2 is an enlarged side view of the loading platform elevating device 10. FIG. 3 is a plan view of the loading platform elevating device 10. In FIGS. 2 and 3, the loading platform elevating device 10 includes a loading platform 11, a lifting mechanism 12 that raises and lowers the loading platform 11, a lifting mechanism 13 that raises and rotates the loading platform 11, and a support section 14. ing.

The support portion 14 includes a pair of left and right fixed frames 15 and a cross member 16. The left and right fixed frames 15 are fixed to the vehicle body 2 via brackets 17, respectively. The cross member 16 is made of a square pipe material extending in the vehicle width direction (left and right direction) below the vehicle body 2. The cross member 16 is fixed to the left and right fixed frames 15.

Front ends of bumper arms 6 extending in the front-rear direction are fixed to the left and right fixed frames 15, respectively. Intermediate portions of the pair of bumper arms 6 in the longitudinal direction are fixed to the vehicle body 2 via a bracket 7. A rear bumper 8 extending in the vehicle width direction is fixed to the rear ends of the pair of bumper arms 6.

FIG. 4 is an exploded side view of the elevating mechanism 12. 2 to 4, the elevating mechanism 12 includes an auxiliary link 21, an upper arm 22, a lower arm 23, a connecting link 24, and a lift cylinder 25. A pair of these structural members 21 to 25 are each provided on the outside of the vehicle body 2 in the vehicle width direction.

The upper end of the auxiliary link 21 is connected to a bracket 26 fixed to the fixed frame 15 so as to be rotatable around the horizontal axis P1. While the loading platform 11 is moving up and down, the weight of the loading platform 11 and the like constantly acts on the auxiliary link 21, so that the auxiliary link 21 is held in contact with the fixed frame 15 (the state shown in FIG. 2). Thereby, a parallel link (described later) by the upper arm 22 and the lower arm 23 is maintained.

One end of the upper arm 22 is connected to the upper part of the auxiliary link 21 so as to be rotatable around a horizontal axis P2 located below the horizontal axis P1. The other end of the upper arm 22 is connected to the upper part of the connecting link 24 so as to be rotatable around the horizontal axis P3. The other ends of the left and right upper arms 22 are connected to each other by a connecting member 27 extending in the vehicle width direction. The connecting member 27 is made of, for example, a round pipe material.

The lower arm 23 is disposed below the upper arm 22 in a side view, and further outward in the vehicle width direction than the upper arm 22 in a plan view. One end of the lower arm 23 is connected to a bracket 28 fixed to the fixed frame 15 so as to be rotatable around a horizontal axis P4. The other end of the lower arm 23 is connected to the lower part of the connection link 24 so as to be rotatable around the horizontal axis P5. The upper arm 22 and the lower arm 23 constitute a parallel link in which the rectangle connecting the four horizontal axes P2 to P5 is a parallelogram.

The lift cylinder 25 is, for example, a single-acting hydraulic cylinder. The tip of the lift cylinder 25 is connected to the lower part of the auxiliary link 21 so as to be rotatable around the horizontal axis P6. The base end of the lift cylinder 25 is connected to the other end of the upper arm 22 so as to be rotatable around a horizontal axis P7. The lift cylinder 25 applies torque to the upper arm 22 by expanding and contracting.

The base portion 11b of the loading platform 11 is connected to the upper portion of the connecting link 24 so as to be rotatable around the horizontal axis P3. The cargo receiving platform 11 has a mounting surface 11a on which cargo to be loaded and unloaded from the cargo box 3, a cart for transporting the cargo, and the like are placed.

A lifting mechanism 13 is provided on the back side of the loading surface 11a of the cargo receiving platform 11. The elevating mechanism 13 includes a elevating cylinder 31 consisting of, for example, a single-acting hydraulic cylinder. The base end of the undulating cylinder 31 is connected to the back side of the loading platform 11 , and the distal end of the undulating cylinder 31 is connected to the connecting link 24 . The undulating cylinder 31 applies torque to the loading platform 11 by expanding and contracting.

With the above configuration, when the lift cylinder 25 is operated to extend or contract, the upper arm 22 and the lower arm 23 rotate up and down while maintaining a parallel link. Specifically, when the lift cylinder 25 is extended, the upper arm 22 and the lower arm 23 rotate upward about horizontal axes P2 and P4, respectively. When the lift cylinder 25 is contracted, the upper arm 22 and the lower arm 23 rotate downward about horizontal axes P2 and P4, respectively. As a result, as shown in FIG. 1, the loading platform 11 moves up and down between the raised position T1 and the lowered position T2 while maintaining a horizontal posture in which the loading surface 11a is horizontal.

When the loading platform 11 descends to the lowered position T2 while maintaining the horizontal position, the base 11b side of the loading platform 11 touches the ground. When the lift cylinder 25 further contracts from this grounded state, the auxiliary link 21 rotates slightly in the counterclockwise direction in FIG. 2 about the horizontal axis P1. As a result, the parallel link between the upper arm 22 and the lower arm 23 collapses, and the cargo receiving platform 11 assumes an inclined posture T3 in which it is inclined backward, as shown in FIG. Thereby, the operator can smoothly move the cart or the like between the ground and the mounting surface 11a of the loading platform 11.

When the loading platform 11 is raised to the raised position T1 while maintaining the horizontal position, the loading surface 11a of the loading platform 11 becomes at the same height as the floor surface 3a of the loading box 3. Thereby, the operator can smoothly move the cart or the like between the floor surface 3a of the cargo box 3 and the loading surface 11a of the cargo receiving platform 11.

In FIGS. 1 and 2, when the loading platform 11 is in the raised position T1, when the undulating cylinder 31 is operated to expand and contract, the loading platform 11 is rotated in an up-and-down manner. Specifically, when the undulating cylinder 31 is extended, the cargo receiving platform 11 rises and rotates about the horizontal axis P3. When the raising and lowering cylinder 31 is contracted, the loading platform 11 is rotated to be lowered about the horizontal axis P3.

The loading platform 11 rotates up and down between a lying down position T4, which is a raised position T1, and an upright position T5, where the mounting surface 11a is substantially vertical. Therefore, after the worker finishes loading and unloading the cargo, the worker can move the freight vehicle 1 by closing the opening/closing door 4 and placing the cargo receiving platform 11 in the upright position T5.

[First detection unit]
In FIGS. 2 and 3, the loading platform elevating device 10 further includes a first detection unit 41 that detects that the lifting position of the loading platform 11 is the raised position T1 (see FIG. 1). The first detection unit 41 is attached to the reinforcing beam 3b of the packing box 3 via a horizontal stay 42 and a vertical stay 45. The reinforcing girder 3b is arranged to extend in the vehicle width direction below the rear of the floor surface 3a. The reinforcing girder 3b is made of, for example, a U-shaped channel material.

The horizontal stay 42 is made of an L-shaped angle member extending in the front-rear direction. The horizontal stay 42 is attached to the reinforcing beam 3b above the lower arm 23 arranged on one side in the left-right direction (on the left side in FIG. 3). The horizontal stay 42 has a first horizontal plate portion 43 to which the horizontal stay 42 is attached to the reinforcing beam 3b, and a second horizontal plate portion 44 to which the vertical stay 45 is attached.

A plurality of insertion holes 43a are formed in the first horizontal plate part 43 at intervals in the front-rear direction, through which bolts (not shown) for fastening the first horizontal plate part 43 to the reinforcing beam 3b are inserted. Thereby, the attachment position of the first horizontal plate portion 43 to the reinforcing girder 3b can be adjusted in the front-rear direction. Moreover, since each insertion hole 43a is a long hole formed in the first horizontal plate part 43 to be elongated in the left-right direction, the attachment position of the first horizontal plate part 43 to the reinforcing girder 3b can also be adjusted in the left-right direction. .

A plurality of insertion holes 44a are formed in the second horizontal plate part 44 at intervals in the front-rear direction, through which bolts (not shown) for fastening the vertical stays 45 to the second horizontal plate part 44 are inserted. Thereby, the attachment position of the vertical stay 45 to the second horizontal plate portion 44 can be adjusted in the front-rear direction. Moreover, since each insertion hole 44a is a long hole formed in the second horizontal plate part 44 to be elongated in the vertical direction, the mounting position of the vertical stay 45 with respect to the second horizontal plate part 44 can also be adjusted in the vertical direction. .

The vertical stay 45 is made of an L-shaped angle member that extends in the vertical direction. The vertical stay 45 is arranged on the left side (outside in the vehicle width direction) of the left lower arm 23. The vertical stay 45 has a first vertical plate part 46 to which the vertical stay 45 is attached to the second horizontal plate part 44, and a second vertical plate part 47 to which the first detection part 41 is attached.

A plurality of insertion holes 46a are formed in the first vertical plate part 46 at intervals in the vertical direction, through which bolts (not shown) for fastening the first vertical plate part 46 to the second horizontal plate part 44 are inserted. ing. Each insertion hole 46a is a long hole formed in the first vertical plate portion 46 to be elongated in the vertical direction. Thereby, the attachment position of the first vertical plate part 46 to the second horizontal plate part 44 can be adjusted in the vertical direction. The first detection section 41 is fixed to the lower part of the second vertical plate section 47 .

As described above, the first detection unit 41 can be attached to the horizontal stay 42, which is attached to the reinforcing girder 3b of the cargo box 3 so that its position can be adjusted in the front-rear direction, and the position can be adjusted in the front-rear direction and the vertical direction with respect to the horizontal stay 42, respectively. It can be attached to the reinforcing girder 3b via a vertical stay 45 that can be attached. Therefore, the horizontal stay 42 and the vertical stay 45 allow adjustment of the attachment position of the first detection section 41 with respect to the reinforcing beam 3b in the front-rear direction and the up-down direction.

The first detection unit 41 includes, for example, a proximity sensor. The detection surface 41a of the first detection unit 41 is arranged at a position where the left lower arm 23 approaches when the cargo receiving platform 11 is raised to the raised position T1. As a result, in the first detection unit 41 of the present embodiment, when the load receiving platform 11 rises to the elevated position T1, the lower arm 23 on the left approaches the detection surface 41a, so that the ascending and descending position of the cargo receiving platform 11 rises. It is designed to detect that the position is T1. A detection signal from the first detection section 41 is output to a control section 52, which will be described later.

[Second detection unit]
FIG. 5 is an enlarged side view showing the vicinity of the base portion 11b of the cargo receiving platform 11. In FIGS. 1 and 5, the loading platform elevating device 10 further includes a second detection unit 48 that detects that the up-and-down posture of the loading platform 11 is the lying posture T4. The second detection unit 48 is composed of, for example, a proximity sensor, and is attached to the base 11b of the cargo receiving platform 11.

The detection surface 48a of the second detection unit 48 is disposed at a position close to the connecting link 24 when the cargo receiving platform 11 is rotated to the lying position T4. Thereby, the second detection unit 48 of this embodiment detects that the up-and-down attitude of the loading platform 11 is the down-down attitude T4 when the detection surface 48a approaches the connection link 24. A detection signal from the second detection section 48 is output to a control section 52, which will be described later.

[Notification Department]
FIG. 6 is a perspective view looking rearward from inside the cargo box 3 when the cargo receiving platform 11 is in the raised position T1. In FIG. 6, the loading platform elevating device 10 further includes a notification section 51 that notifies the operator that the loading platform 11 is in the raised position T1 and the collapsed position T4. The notification unit 51 is, for example, a lamp such as an LED lamp. The notification unit 51 of this embodiment is provided inside the cargo box 3 so as not to be mistaken for a light device (not shown) such as a brake lamp provided outside the cargo box 3 at the rear of the truck 1. Specifically, the notification section 51 of this embodiment is attached to a support column 3d arranged at the rear end of the left side wall 3c of the cargo box 3.

Further, the notification unit 51 is located near the installation position of the internal remote controller 18 at a human eye level on the front surface 3e of the support 3d so that it can be easily seen by the worker working inside the shipping box 3. is attached to. The warehouse remote controller 18 is a wired remote controller provided in the loading platform lifting device 10 so that an operator can raise and lower the loading platform 11 within the loading box 3 and operate the up/down rotation. Turning on and off of the notification section 51 is controlled by a control section 52, which will be described later.

[Control unit]
FIG. 7 is a block diagram showing the control configuration of the loading platform lifting/lowering device 10. As shown in FIG. In FIG. 7 , the loading platform elevating device 10 further includes a control section 52 that controls the notification section 51 . The control unit 52 is provided in a power unit (not shown) of the loading platform elevating device 10. The control unit 52 includes a computer including a CPU and the like. Each function of the control unit 52 is performed by the CPU executing a control program stored in the storage device of the computer.

The first detection section 41, the second detection section 48, and the notification section 51 are each connected to the control section 52 via signal lines (not shown). Each detection signal from the first detection section 41 and the second detection section 48 is input to the control section 52 . The control unit 52 controls turning on and off of the notification unit 51 based on these detection signals.

Specifically, the control unit 52 turns on the notification unit 51 (makes the notification unit 51 notify) while both the detection signal of the first detection unit 41 and the detection signal of the second detection unit 48 are input. . In this state, when either the detection signal of the first detection section 41 or the detection signal of the second detection section 48 is no longer input to the control section 52, the control section 52 turns off the notification section 51 (the notification section 51 (stop notifications).

FIG. 8 is a flowchart showing an example of control of the notification unit 51 executed by the control unit 52. Hereinafter, with reference to FIG. 8, an example of control executed by the control unit 52 from a state where the notification unit 51 is turned off will be described. First, the control unit 52 determines whether a detection signal from the first detection unit 41 has been input (step ST1). If the detection signal of the first detection unit 41 is not input (“No” in step ST1), the control unit 52 returns to step ST1 and performs the determination in step ST1 again after a predetermined time has elapsed.

On the other hand, if the detection signal of the first detection unit 41 is input (“Yes” in step ST1), the control unit 52 determines whether or not the detection signal of the second detection unit 48 is input next. (Step ST2). Note that the determination in step ST2 may be performed before the determination in step ST1.

If the detection signal of the second detection unit 48 is not input (“No” in step ST2), the control unit 52 returns to step ST1 and performs the determination in step ST1 again after a predetermined time has elapsed. On the other hand, when the detection signal of the second detection section 48 is input ("Yes" in step ST2), the control section 52 turns on the notification section 51 (step ST3).

Next, the control unit 52 determines whether the detection signal of the first detection unit 41 is no longer input (step ST4). When the detection signal of the first detection unit 41 is no longer input (“Yes” in step ST4), the control unit 52 turns off the notification unit 51 (step ST5), and returns to step ST1.

On the other hand, if the detection signal of the first detection unit 41 is still being input (“No” in step ST4), the control unit 52 next determines whether the detection signal of the second detection unit 48 is no longer being input. is determined (step ST6). Note that the determination in step ST6 may be performed before the determination in step ST4. When the detection signal of the first detection unit 41 is no longer input (“Yes” in step ST6), the control unit 52 turns off the notification unit 51 (step ST5), and returns to step ST1.

On the other hand, if the detection signal of the second detection unit 48 is still being input (“No” in step ST6), the control unit 52 returns to step ST4, and after a predetermined period of time has elapsed, the control unit 52 makes the determination in step ST4 again. I do.

With the above control, while both the detection signals of the first detection section 41 and the second detection section 48 are input to the control section 52, that is, while the cargo receiving platform 11 is in the raised position T1 and the collapsed posture T4, the notification is made. The section 51 continues to light up (notify). In this state, when either one of the detection signals from the first detection section 41 and the second detection section 48 is no longer input to the control section 52, the notification section 51 turns off (stops notification). For example, when the loading platform 11 at the raised position T1 is lowered or rotated to stand up, the notification unit 51 turns off. Furthermore, when the loading surface 11a of the loading platform 11 at the raised position T1 is tilted backwards to bridge the loading platform 11 to the platform (see FIG. 10 of Japanese Unexamined Patent Publication No. 2003-165378), the notification unit 51 goes out.

[Actions and effects of this embodiment]
According to the loading platform elevating device 10 of the present embodiment, while the first detection unit 41 detects that the loading platform 11 is at the raised position T1 at the same height as the floor surface 3a of the loading box 3, the control unit 52 lights up the notification section 51. As a result, when the notification unit 51 is giving the notification, that is, when the loading platform 11 is at the same height as the floor surface 3a of the loading box 3, the operator can check the floor surface 3a of the loading box 3 and the loading platform 11 The cargo can be moved between the loading surface 11a and the loading surface 11a. As a result, it is possible to prevent the work of moving cargo from being performed when the loading platform 11 is at a position lower than the floor surface 3a of the cargo box 3, thereby suppressing a decrease in the workability of the moving work. Can be done. In particular, when moving a cart for transporting cargo between the floor surface 3a and the mounting surface 11a, the cargo platform lifting device 10 of this embodiment is more effective.

In addition, the control unit 52 lights up the notification unit 51 when the loading platform 11 is in the raised position T1 and the collapsed posture T4, so even if the loading platform 11 is in the raised position T1 and in the upright posture T5, , the notification unit 51 will not light up. Therefore, it is possible to suppress power consumption when the freight vehicle 1 is driven with the loading platform 11 in the upright position T5.

Further, since the notification unit 51 is provided inside the cargo box 3, the worker can easily know that the cargo receiving platform 11 is at the raised position T1 even when working inside the cargo box 3. . Furthermore, it is possible to prevent the notification unit 51 from being mistaken for a lighting device such as a brake lamp provided at the rear of the truck 1.

Moreover, since the mounting position of the first detection part 41 with respect to the reinforcing girder 3b can be adjusted in the longitudinal direction and the vertical direction by the horizontal stay 42 and the vertical stay 45, the first detection part 41 can detect that the cargo receiving platform 11 is at the raised position T1. This allows reliable detection.

[others]
Although the loading platform lifting device 10 of the above embodiment is of an upright retractable type, other types of loading platform lifting device such as an underfloor storage type or a vertical lifting type may be used.

Although the first detection unit 41 in the embodiment described above detects the lower arm 23 on the left side, the present invention is not limited to this. For example, the first detection unit 41 may detect the lower arm 23 on the right side, the upper arm 22 on either the left or right side, the connecting link 24 on the left or right side, or the cargo receiving platform 11 at the raised position T1. Further, the first detection section 41 may be provided in the elevating mechanism 12. In that case, the first detection unit 41 may detect the vehicle body 2, the support portion 14, or the bracket 17 when the cargo receiving platform 11 is in the raised position T1. Further, the first detection unit 41 may be provided in the cargo receiving stand 11. In that case, the first detection unit 41 may detect the cargo box 3 or the lifting mechanism 12 when the cargo receiving platform 11 is in the raised position T1. Further, the first detection unit 41 is not limited to a proximity sensor, and may be a limit switch, for example. The mounting structure of the first detection section 41 is not limited to the horizontal stay 42 and the vertical stay 45, and may be any other mounting structure.

Although the second detection unit 48 in the embodiment described above is provided on the loading platform 11 to detect the connecting link 24, it may also be provided on the connecting link 24 to detect the loading platform 11. Further, the second detection unit 48 is not limited to a proximity sensor, and may be a limit switch or an angle sensor that detects the up-and-down angle of the cargo receiving platform 11, for example.

Although the control section 52 in the embodiment described above is used exclusively for controlling the notification section 51, it may also serve as drive control for the loading platform elevating device 10. Further, the control unit 52 of the above embodiment causes the notification unit 51 to notify when both the detection signals of the first detection unit 41 and the second detection unit 48 are input, but the detection signal of the first detection unit 41 The notification unit 51 may be made to notify only by inputting .

The mounting position of the notification section 51 is not limited to this embodiment. For example, the notification section 51 may be provided on the right side of the cargo box 3, on the floor surface 3a, or on the ceiling, or may be provided on the cargo receiving stand 11. In the latter case, it is preferable that the notification unit 51 is turned on toward the inside of the cargo box 3 when the cargo receiving platform 11 is in the raised position T1 so that the worker working inside the cargo box 3 can easily see it.

The notification unit 51 notifies that the loading platform 11 is in the raised position T1 by the difference between lighting and turning off, but depending on the difference between lighting and blinking, changing the lighting color, etc. It may be possible to notify that it is at T1. For example, when changing the lighting color, the notification unit 51 may turn on the light in red when the loading platform 11 is in a position other than the raised position T1, and may turn on the lighting in blue when the loading platform 11 is in the raised position T1. Further, in addition to the lamp, the notification section 51 may be one that displays characters on a liquid crystal screen to notify the user, or a device that provides audio notification using an alarm buzzer, a speaker, or the like.

It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered restrictive. The scope of the present invention is indicated by the claims rather than the above-mentioned meaning, and is intended to include meanings equivalent to the claims and all changes within the scope.

2 Vehicle body 3 Loading box 3a Floor surface 10 Loading platform elevating device 11 Loading platform 12 Lifting mechanism 13 Lifting mechanism 41 First detection section 48 Second detection section 51 Notification section 52 Control section T1 Raised position T2 Lowered position T4 Lodging posture T5 Standing posture

(1) The present invention provides a cargo receiving platform having a loading surface on which cargo is placed in order to load and unload the cargo into a cargo box mounted on a vehicle body; , a lifting mechanism that raises and lowers the loading platform between a raised position at the same height as the floor surface of the loading box and a lowered position where it touches the ground; a first detection unit that detects, a second detection unit that detects that the placement surface is in a horizontal position, a notification unit that notifies a worker that the loading platform is in the raised position; The loading platform lifting and lowering device includes a control unit that causes the notification unit to notify while both a detection signal from the detection unit and a detection signal from the second detection unit are input.

(2) The loading platform elevating device according to (1) further includes a lifting mechanism that raises and rotates the loading platform between an upright position and a collapsed position when the loading platform is in the raised position ; It is preferable that the second detection unit detects that the up-and-down attitude of the cargo receiving platform is the inverted attitude, and that the placement surface is in the horizontal attitude .
In this case, the control unit causes the notification unit to notify when the loading platform is in the raised position and the collapsed position, so if the loading platform is in the upright position but in the upright position, the notification unit will notify you. Never. Therefore, power consumption when the loading platform is in the upright position can be reduced.

(3) In the cargo platform elevating device of (1) or (2), the elevating mechanism includes an upper arm and a lower arm disposed below the upper arm, and the first detection It is preferable that the part detects the upper arm or the lower arm when the loading platform is raised to the raised position .
(4) In the loading platform elevating device according to any one of (1) to (3) above , it is preferable that the notification section is provided within the loading box.
In this case, even if the worker is working inside the cargo box, he or she can easily know that the cargo receiving platform is in the raised position.

Claims (3)

A cargo receiving platform on which cargo is placed for loading and unloading the cargo into a cargo box mounted on the vehicle body;
a lifting mechanism that raises and lowers the loading platform between a raised position at the same height as the floor of the loading box and a lowered position where it touches the ground;
a first detection unit that detects that the lifting position of the loading platform is the raised position;
a notification unit that notifies a worker that the loading platform is in the raised position;
A loading platform lifting and lowering device comprising: a control unit that causes the notification unit to notify while a detection signal is being input from the first detection unit. a levying mechanism that raises and rotates the loading platform between an upright position and a collapsed position when the loading platform is in the raised position;
further comprising a second detection unit that detects that the up-and-down attitude of the loading platform is the down-down attitude;
The loading platform elevating device according to claim 1, wherein the control section causes the notification section to notify while both the detection signal of the first detection section and the detection signal of the second detection section are input. The load receiving platform elevating device according to claim 1 or 2, wherein the notification section is provided within the load box.

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