JP7580179B2 - Box-type loading platform lifting device - Google Patents

Description

The present invention relates to a lifting device for a box-type loading platform.

As a box-shaped loading platform used in transport vehicles such as trucks and trailers, there is a box-shaped loading platform with multiple loading platform surfaces on the top and bottom. With such a box-shaped loading platform, luggage and carts can be loaded on each loading platform surface, so even luggage and carts that cannot be stacked can be placed one above the other, and thus the volume of luggage and carts in the luggage compartment can be increased. This box-shaped loading platform is provided with a lifting means for raising and lowering luggage and carts. An example of a box-shaped loading platform provided with a lifting means is described in Patent Document 1. The lifting device for this box-shaped loading platform is provided with a lifting platform provided at the rear end of the loading platform. The lifting platform has a width dimension that is approximately half the width of the vehicle, and rises and falls between the floor surface of the loading platform and the upper loading platform surface.

Publication number 6-36016

In the box-type cargo bed lifting device of Patent Document 1, the width of the lifting bed is approximately half the width of the vehicle, so the frame and guide rails that support and raise and lower the lifting bed are provided in the middle of the bed. This causes a problem of narrowing the storage space in the cargo compartment.

Therefore, the objective of the present invention is to provide a lifting device for a box-type cargo bed that allows the cargo room to be used effectively without narrowing the storage space of the cargo room.

The first invention for solving the above problems is a lifting device provided behind a loading platform surface having multiple levels in the loading compartment of a box-type loading platform. The lifting device for the box-type loading platform includes a lifting platform, a guide frame for guiding the lifting and lowering of the lifting platform, a lifting slider housed in the guide frame and lifting and lowering together with the lifting platform, and a lifting mechanism for lifting and lowering the lifting slider. The guide frames are provided in pairs on the left and right at both ends in the width direction of the loading compartment, the guide frames, the lifting slider, and the lifting mechanism are housed within the wall thickness of the box-type loading platform , and the device further includes an upper sensor for detecting when an upper end of a cargo loaded on the lifting platform reaches a predetermined height near the ceiling of the loading compartment .
The second invention for solving the above problem is a lifting device provided behind a plurality of upper and lower loading platform surfaces in the loading compartment of a box-type loading platform. The lifting device for the box-type loading platform includes a lifting platform, a guide frame for guiding the lifting and lowering of the lifting platform, a lifting slider housed in the guide frame and lifting and lowering together with the lifting platform, and a lifting mechanism for lifting and lowering the lifting slider. The guide frames are provided in pairs on the left and right at both ends in the width direction of the loading compartment, the guide frames, the lifting slider, and the lifting mechanism are housed within the wall thickness of the box-type loading platform, and the device further includes an upper-level sensor for detecting when the lifting platform reaches the height of the loading platform surface of the upper level.
The third invention for solving the above-mentioned problems is a lifting device provided behind a loading compartment of a box-type loading compartment having a plurality of upper and lower loading compartment surfaces. The lifting device for the box-type loading compartment includes a lifting platform, a guide frame for guiding the lifting platform to rise and fall, a lifting slider housed in the guide frame and lifting and lowering together with the lifting platform, and a lifting mechanism for lifting and lowering the lifting slider. The guide frames are provided in pairs on the left and right at both ends in the width direction of the loading compartment, the guide frames, the lifting slider, and the lifting mechanism are housed within the wall thickness of the box-type loading compartment, and the device further includes an entry monitoring sensor for detecting the presence or absence of luggage being brought into the loading compartment.

According to the lifting device for the box-type loading platform of the present invention, the guide frame, the lifting slider, and the lifting mechanism are accommodated within the wall thickness of the box-type loading platform, so that the loading platform can be used effectively without narrowing the storage space of the loading platform. In addition, since there is one guide frame on each side, the number of parts of the guide frame, the lifting slider, and the lifting mechanism can be minimized, and the structure can be simplified. According to the first invention, if the lifting platform is stopped from rising in response to detection by the upper sensor, it is possible to prevent the luggage from colliding with the ceiling of the loading platform. According to the second invention, if the lifting platform is stopped from rising in response to detection by the upper sensor, it is possible to stop the lifting platform at the height of the upper loading platform surface. Furthermore, according to the third invention, if the lowering of the lifting platform is stopped in response to detection by the carry-in monitoring sensor when the lifting platform is lowered, it is possible to prevent the luggage from colliding with the lifting platform.

The box-type loading platform lifting device of the present invention is preferably further provided with a stopper that stops the lifting of the platform at a predetermined height. With this configuration, the lifting height of the platform can be controlled.

The lifting device for a box-type loading platform of the present invention preferably further includes a support device that supports the lifting platform at a predetermined height. If the lifting platform is supported by the support device when the lifting mechanism is not in use, such as when the vehicle is traveling, the load on the lifting mechanism can be reduced.

The lifting device for the box-type cargo bed of the present invention allows the cargo compartment to be used effectively without narrowing the storage space of the cargo compartment.

1 is a side view showing a lifting device for a box-type loading platform according to an embodiment of the present invention; 1 is a plan view showing a lifting device for a box-type loading platform according to an embodiment of the present invention; 3 is a view taken along line AA of FIG. 2, illustrating a state in which the lifting platform of the lifting device for the box-type cargo bed according to the embodiment of the present invention is in an upper stage position. 3 is a view taken along line AA of FIG. 2, illustrating a state in which the lifting platform of the lifting device for the box-type cargo bed according to the embodiment of the present invention is in a lower position. 3, (b) is a view taken along line CC, (c) is a view taken along line DD, and (d) is a view taken along line EE in FIG. 1 is an enlarged side view of a main portion showing a guide frame, a lifting slider, and a lifting mechanism of a lifting device for a box-type loading platform according to an embodiment of the present invention. 6A is a view taken along line FF in FIG. 6, and FIG. 6B is a view taken along line GG. 1A is a plan view showing a support device for a lifting device for a box-type loading platform according to an embodiment of the present invention, and FIG. 1A is a plan view showing a modified example of a support device for a lifting and lowering device for a box-type loading platform according to an embodiment of the present invention, and FIG. FIG. 2 is a side view illustrating various sensors of the lifting device for a box-type cargo platform according to an embodiment of the present invention, showing the lifting platform in a lower position. FIG. 2 is a side view illustrating various sensors of the lifting device for a box-type loading platform according to an embodiment of the present invention, showing the lifting platform in an upper position. FIG. 2 is a side view illustrating various sensors of the lifting device for a box-type cargo bed according to an embodiment of the present invention, showing the lifting bed in the upper end position. 1 is a perspective view showing a stopper and an upper level sensor of a lifting device for a box-type platform according to an embodiment of the present invention;

The following describes in detail the embodiment of the present invention with reference to the attached drawings. In this embodiment, the lifting device is installed on a rear-opening box-shaped loading platform with an opening and closing door at the rear end. In this embodiment, the front, rear, left and right directions refer to the directions seen from the driver sitting in the driver's seat.

As shown in FIG. 1, the cargo compartment 3 of the box-shaped cargo platform 1 has multiple upper and lower cargo compartment surfaces. In this embodiment, the cargo compartment surface is provided in two levels, with the lower cargo compartment surface being composed of a floor surface 4 and the upper cargo compartment surface being composed of shelves 5 provided on both the left and right side walls of the cargo compartment 3. The shelves 5 are rotatably attached to the side walls. The shelves 5 are horizontal when in use and rise up and become parallel to the side walls when stored. The shelves 5 extend rearward from the front end of the cargo compartment 3. The rear end of the shelves 5 is located at a position spaced a predetermined distance from the rear end of the cargo compartment 3.

The lifting device 2 is provided behind the loading platform surface (floor surface 4, shelf board 5) (at the rear of the loading compartment 3 of the box-shaped loading platform 1) and includes a lifting platform 10, a guide frame 20, a lifting slider 30, and a lifting mechanism 50. The lifting device 2 further includes a fixing means 70 (see FIG. 2) and a sensor means 80 (see FIG. 10).

The lift platform 10 is used to carry luggage or a loading platform (hereinafter simply referred to as "luggage") carried in through the opening at the rear end of the luggage compartment 3. The lift platform 10 moves up and down while maintaining a horizontal state, transporting luggage from the height of the floor surface 4 to the height of the shelf board 5. The lift platform 10 is placed on a recess 4a formed at the rear end of the floor surface 4. As shown in Figures 2 to 4, the lift platform 10 includes a platform body 11, front and rear rotating plate parts 12, 13, and left and right side plate parts 14, 14. The platform body 11 is a plate-like rectangular plane. The platform body 11 includes a reinforcing frame 10a (see Figures 5, 8, and 9) inside, and has a certain strength (strength that allows luggage to be placed on it).

The front rotating plate 12 is attached to the front end of the table body 11 and extends left and right along the front edge of the table body 11. The front rotating plate 12 can rotate between a horizontal state and a raised state, and when in the horizontal state, it protrudes forward. When the lifting platform 10 is at the height of the floor surface 4 or the shelf board 5, the front rotating plate 12 is in a horizontal state between the table body 11 and the floor surface 4 or the shelf board 5, and luggage can move on the upper surface of the rotating plate 12. When the lifting platform 10 is rising or falling, the front rotating plate 12 is in a raised state, so that luggage does not slip forward. A locking hook (not shown) is rotatably provided on the side of the rotating plate 12. When the rotating plate 12 is raised, the locking hook is engaged with a pin formed on the side plate 14 to fix the rotating plate 12.

The rear rotating plate 13 is attached to the rear end of the platform body 11 and extends left and right along the rear edge of the platform body 11. The rear rotating plate 13 can rotate between a horizontal state and a raised state. When the lift platform 10 is at the height of the floor surface 4, the rear rotating plate 13 extends rearward from the platform body 11 and is in a horizontal state. The upper surface of the rotating plate 13 is inclined downward toward the rear and rubs against the surface of the recess 4a. When the lift platform 10 is rising or falling or when the lift platform 10 is stopped at the top, the rear rotating plate 13 is in a raised state so that the luggage does not slip rearward. A locking hook (not shown) of the same shape as the locking hook of the rotating plate 12 is rotatably provided on the side of the rotating plate 13. When the rotating plate portion 13 is raised, the locking hook is engaged with a pin formed at the rear end of the side plate portion 14, thereby fixing the rotating plate portion 13.

The side plate portions 14 are attached to the left and right side portions of the table body 11, respectively, and extend forward and backward along the side edges of the table body 11. The lower portion of the side plate portion 14 is fixed to the side of the table body 11. The upper portion of the side plate portion 14 protrudes above the top surface of the table body 11, preventing luggage from shifting sideways.

As shown in Figures 3 to 6, the guide frames 20 are provided on both ends of the width of the cargo compartment 3, and are used to guide the lift platform 10 as it ascends and descends. A pair of guide frames 20 are provided on the left and right sides of the cargo compartment 3. The guide frames 20 are made of channel steel with a C-shaped cross section. The left and right guide frames 20, 20 are arranged so that the openings 21 of the C-shaped cross section face each other. The guide frames 20 have a thickness dimension that is less than the wall thickness dimension t (see Figure 5) of the box-type cargo bed 1, and are housed within the wall thickness t of the box-type cargo bed 1. The guide frames 20 extend from the floor surface 4 of the cargo compartment 3 toward the ceiling surface. Guide rails 22 extending up and down are installed on the front and rear inner peripheral surfaces of the guide frames 20, respectively.

The lift slider 30 is a part that rises and falls together with the lift platform 10. The lift slider 30 has a rectangular tubular shape extending vertically, and is housed in the guide frame 20 so that it can rise and fall. The lift slider 30 is arranged so that it rises upward from the side of the lift platform 10. Guide rollers 31 that protrude toward the guide rail 22 are provided on the front and rear sides of the lift slider 30, and the lift slider 30 rises and falls along the guide frame as the guide rollers 31 rotate while in contact with the guide rail 22. The front guide roller 31 is provided at the upper end of the lift slider 30, and the rear guide roller 31 is provided at the lower end of the lift slider 30 (see FIG. 6). The positions of the front and rear guide rollers 31 are not limited to the above positions. The upper end of the lift slider 30 is provided with a mounting member 32 (see FIG. 6) for connecting the lift mechanism 50. The mounting member 32 includes a plate 33 fixed to the upper end of the lift slider 30 and a rising portion 34 rising from the plate 33. One end of a connecting chain 55 (described later) of the lift mechanism 50 is fixed to the tip (upper end) of the rising portion 34.

The lift platform 10 is fixed to the lower end of the lift slider 30. The lift platform 10 is fixed to the lower end of the lift slider 30 via a bolt 35 (see FIG. 5(d)) inserted into the side of the lift platform 10. The bolt 35 connects the lift platform 10 and the lift slider 30, and passes through the opening 21 of the guide frame 20. The lift platform 10 is fixed to the lift slider 30 and the guide frame 20 with a specified distance between them.

3 and 4, a diagonal member 37 is connected to the middle of the height direction of the lift slider 30. The diagonal member 37 is a member for holding the lift platform 10, and one end (upper end) is connected to the side of the lift slider 30, and the other end (lower end) is connected to the side of the lift platform 10. The diagonal member 37 is arranged at a predetermined angle toward the front from the lift slider 30 and holds the lift platform 10 in a horizontal state. The upper end of the diagonal member 37 is fixed to the lift slider 30 via a bolt 38 (see (c) of FIG. 5) inserted into the side of the lift slider 30. The bolt 38 passes through the opening 21 of the guide frame 20. A spacer 39 is provided between the lift slider 30 and the diagonal member 37, and the diagonal member 37 is fixed to the lift slider 30 and the guide frame 20 at a predetermined interval. The lower end of the diagonal member 37 is connected to the side of the lift platform 10 via a bolt 40. A horizontal portion 41 is formed on the upper side of the diagonal member 37. The horizontal portion 41 is the portion that abuts from below against the locking block 86 of the upper sensor 82, which will be described later.

The lifting mechanism 50 lifts and lowers the lifting slider 30 together with the lifting platform 10. The lifting mechanism 50 includes a drive actuator 51 and a drive force transmission means 52. The drive actuator 51 is, for example, a hydraulic telescopic cylinder. The thickness dimension of the drive actuator 51 is smaller than the thickness dimension of the guide frame 20, and the drive actuator 51 is housed within the wall thickness t (see FIG. 5(a)). The drive actuator 51 is disposed behind the lower end of the guide frame 20, extending vertically. The drive actuator 51 is configured such that the cylinder tube 53 is disposed on the lower side and the rod 54 extends upward and downward. The drive actuator 51 is fixed to the guide frame 20 via the cylinder support member 23 (see FIG. 5(a)) and the lower support member 28 (see FIG. 5(b)). The cylinder support member 23 is a member that supports the upper part of the cylinder tube 53, and includes a bracket 23a having a U-shaped cross section and a pressing member 23b that covers the opening of the bracket 23a. The cylinder support member 23 supports the cylinder tube 53 by surrounding it with the pressing member 23b, which is inserted into the bracket 23a. The lower support member 28 is a member that supports the lower end of the drive actuator 51, and includes a pair of left and right brackets 28a, 28a and a support pin 28b. The bracket 28a protrudes rearward from the lower end of the guide frame 20, and an insertion hole for the support pin 28b is formed at the tip. A connection part 51a provided at the lower end of the drive actuator 51 is inserted between the pair of left and right brackets 28a, 28a. The connection part 51a is provided with an insertion hole 51b through which the support pin 28b is inserted. The support pin 28b is inserted through the insertion hole at the tip of the bracket 28a and the insertion hole 51b of the connection part 51a, and the drive actuator 51 is connected to the guide frame 20.

As shown in FIG. 6, the driving force transmission means 52 includes a connecting chain 55, a first sprocket 56, and a second sprocket 57. The thickness dimension of the connecting chain 55, the first sprocket 56, and the second sprocket 57 is smaller than the thickness dimension of the guide frame 20, and is accommodated within the wall thickness t (see FIG. 7) of the box-type loading platform 1. One end of the connecting chain 55 enters the inside of the guide frame 20 and is fixed to the upper end of the lifting slider 30, and the other end of the connecting chain 55 is fixed to the upper end of the guide frame 20. The other end of the connecting chain 55 is attached to the connecting chain support part 26 of the support member 24 described below.

The first sprocket 56 is composed of a fixed pulley provided at the rear upper end of the guide frame 20. The first sprocket 56 is rotatably supported by a support member 24 (see Figures 6 and 7(a)) arranged at the rear of the guide frame 20. The support member 24 has a pulley support part 25 and a connecting chain support part 26. The pulley support part 25 has a gate-shaped bracket 25a fixed to the rear of the guide frame 20 and a support pin 25b attached to the gate-shaped bracket 25a. The support pin 25b extends to the left and right and is inserted into the center of the first sprocket 56. The front end of the first sprocket 56 is located inside the guide frame 20, and the rear end is located at the rear of the guide frame 20. The connecting chain support part 26 has a plate 26a fixed to the lower end of the pulley support part 25 and a hanging part 26b hanging from the plate 26a. The other end of the connecting chain 55 is fixed to the tip (lower end) of the hanging part 26b.

The second sprocket 57 is composed of a movable pulley provided at the upper end of the rod 54 of the drive actuator 51. The second sprocket 57 is rotatably supported by a support member 58 (see Figures 6 and 7(b)) located at the upper end of the rod 54. The support member 58 includes a gate-shaped bracket 58a fixed to the upper end of the rod 54 and a support pin 58b (see Figure 7(b)) attached to the gate-shaped bracket 58a. The support pin 58b extends to the left and right and is inserted into the center of the second sprocket 57. The second sprocket 57 rises and falls in response to the rise and fall of the rod 54.

One end of the connecting chain 55 is fixed to the upper end of the lift slider 30, extends upward from the lift slider 30, is wound around a first sprocket 56, and extends downward. The connecting chain 55 is further wound around a second sprocket 57 and extends upward, and the other end of the connecting chain 55 is fixed to the connecting chain support portion 26 of the support member 24.

The fixing means 70 is a support device that supports the lift platform 10 at a predetermined height. In this embodiment, the fixing means 70 is built into the rear of the lift platform 10 (see FIG. 2), and both ends of the fixing means 70 are engaged with the locking frame 27 arranged on the side wall of the luggage compartment to support the lift platform 10 at the upper limit height. The upper limit height is the height at which the luggage on the lift platform 10 does not contact the ceiling of the luggage compartment 3 (see FIG. 12). When the lift platform 10 is at the upper limit height, the fixing means 70 protrudes the locking portion (retractable pin 77 described later) on the left and right outer sides to lock it to the locking frame 27. As shown in FIG. 8 and FIG. 9, the fixing means 70 includes a rotating lever 71, a cam 72, and a locking member 73.

As shown in FIG. 9, the rotating lever 71 has an operating lever 74 and a rotating rod 75. The operating lever 74 is attached to the reinforcing frame 10a on the rear surface of the table body 11, and is exposed to the rear and can be operated when the rear rotating plate portion 13 is raised. The operating lever 74 can be operated from the rear of the table body 11. The operating lever 74 can be rotated between the locking position P1 and the non-locking position P2 (see FIG. 9(b)). A spring member 76 is stretched between the operating lever 74 and the rear surface of the table body 11, so that the operating lever 74 can be fixed at the locking position P1 and the non-locking position P2. When the operating lever 74 is in the locking position P1, the tip of the operating lever 74 protrudes upward from the top surface of the table body 11. When the operating lever 74 is in the non-locking position P2, the operating lever 74 fits within the height range of the table body 11.

The rotating rod 75 extends in the front-rear direction and is rotatably supported by the reinforcing frame 10a of the lift platform 10 (see FIG. 9(a)). The rotating rod 75 is integrated with the operating lever 74 and rotates together with the operating lever 74. The front end of the rotating rod 75 extends to the front position of the guide frame 20 in a side view. A locking frame 27 having a locking portion is provided in front of the guide frame 20. The locking portion is formed at a height equivalent to the locking member 73 when the lift platform 10 is at the upper limit height, and the lift platform 10 is supported by the side wall portion (locking frame 27) of the luggage compartment 3 by locking the locking member 73 to the locking portion. The height at which the locking portion is formed is not limited to the above height, and multiple locking holes may be formed at any desired height.

The cam 72 is fixed to the front end of the rotating rod 75 and rotates together with the rotating rod 75. The cam 72 has an elongated shape that spreads out on both sides from the rotating rod 75. The left and right locking members 73 are connected to the tip of the cam 72. The locking members 73 are provided in pairs on the left and right, and extend from the cam 72 toward both the left and right ends. The locking members 73 include a retractable pin 77 and a connecting rod 78. The retractable pin 77 is a member that protrudes outward from the outer end of the table body 11 and is held movably along a cylindrical support member 79 fixed to the reinforcing frame 10a of the table body 11. The connecting rod 78 connects the cam 72 and the retractable pin 77, with one end pin-connected to the tip of the cam 72 and the other end pin-connected to the inner end of the retractable pin 77. When the cam 72 is in an engaged position inclined toward the retractable pin 77, the retractable pin 77 is pushed outward and protrudes (see FIG. 8B). When the cam 72 is in an unengaged position inclined away from the retractable pin 77, the retractable pin 77 is pulled inward and retracted (shown by phantom lines in FIG. 8B).

As shown in Figures 10 to 13, the sensor means 80 includes an upper sensor 81, an upper stage sensor 82, a loading monitoring sensor 83, a movable pulley position sensor 84, and a retractable pin sensor 85.

The upper sensor 81 is a sensor that detects when the upper end of the luggage loaded on the lift platform 10 reaches a predetermined height near the ceiling of the luggage compartment 3. The upper sensor 81 is, for example, an optical sensor, and is installed near the ceiling at the rear end of the luggage compartment 3. The upper sensor 81 emits a planar light parallel to the ceiling of the luggage compartment 3, and when luggage or the like rises and blocks the projected light, it detects this and determines that the luggage has approached near the ceiling. The upper sensor 81 is connected to the operation control unit of the drive actuator 51, and when the upper sensor 81 detects the approach of luggage, it forcibly stops the operation of the drive actuator 51, thereby stopping the rise of the lift platform 10.

The upper sensor 82 is a sensor that detects when the lift platform 10 reaches the height of the upper loading platform surface (shelf board 5). Furthermore, the upper sensor 82 in this embodiment also serves as a stopper that stops the lift platform 10 from rising at a predetermined height. The upper sensor 82 is provided in front of the guide frame 20 and above the height of the shelf board 5. As shown in FIG. 13, the upper sensor 82 includes a locking block 86 and a sensor body 87. The locking block 86 is a member that the horizontal part 41 of the diagonal member 37 abuts against from below, and is provided rotatably between a protruding position where the locking block 86 protrudes to a position where the diagonal member 37 passes through, and a stored position where the locking block 86 is stored within the wall thickness t of the cargo room 3. The locking block 86 is attached to a rotating shaft 88 that extends vertically so as to be rotatable and movable up and down. When the locking block 86 is in the protruding position, the tip of the locking block 86 protrudes inward, and is pushed up when the diagonal member 37 abuts against it from below. A pressure spring member 89 is provided above the locking block 86, and the locking block 86 is pushed up a certain distance against the spring force of the pressure spring member 89 and then stopped. When the locking block 86 is in the stored position, the tip extends forward and is entirely contained within the wall thickness t, so as not to impede the ascent of the diagonal member 37. This allows the diagonal member 37 and the lifting platform 10 to pass the side of the upper sensor 82 and be raised and lowered. The base end of the locking block 86 protrudes toward the sensor body 87 provided below.

The sensor body 87 is made of a microswitch and has a pin 87a that protrudes upward. The downward protruding portion 86a of the base end of the locking block 86 presses the pin 87a. When the lift platform 10 rises to a predetermined position and the locking block 86 is pushed up, the protruding portion 86a moves away from the pin 87a. The sensor body 87 detects that the lift platform 10 has reached the height of the shelf board 5 by the separation of the pin 87a. The sensor body 87 is connected to the operation control unit of the drive actuator 51, and when it detects that the lift platform 10 has risen to the height of the shelf board 5, it stops the operation of the drive actuator 51 and stops the lift platform 10 at the height of the shelf board 5. In other words, the upper stage sensor 82 detects that the lift platform 10 has reached the height of the upper stage loading surface (shelf board 5) and serves as a stopper that stops the lift platform 10 from rising at a predetermined height.

10 to 12 is a sensor that detects the presence or absence of luggage being brought into the rear end opening of the luggage compartment 3, and is intended to detect the intrusion of an obstacle (luggage) below the descending lift platform 10 and stop the movement of the lift platform 10 to avoid a collision between the lift platform 10 and the obstacle. The carry-in monitoring sensor 83 is, for example, a light sensor, and is installed on the edge of the opening at the rear end of the luggage compartment 3. The carry-in monitoring sensor 83 is installed in two places: the lower end of the rear end opening edge of the luggage compartment 3 and at a height position lower than the shelf board 5. The carry-in monitoring sensor 83 irradiates light in a planar manner along the opening at the rear end of the luggage compartment 3, and when the light is blocked by luggage or the like passing through the rear end opening, it detects this and determines that there is luggage being brought in. The carry-in monitoring sensor 83 is connected to the operation control unit of the drive actuator 51, and when it detects the intrusion of luggage into the luggage compartment 3 from the rear end opening of the luggage compartment 3, it stops the operation of the drive actuator 51 and stops the descent of the lift platform 10. When the carry-in monitoring sensor 83 is activated, as shown in FIG. 11, when the lift platform 10 is at or above the height of the shelf board 5, it is visually confirmed that there are no obstacles below the lift platform 10, and then the carry-in monitoring sensor 83 is activated while the lift platform 10 is lowered. When the lift platform 10 is on the lowest floor surface 4, there is no risk of an obstacle getting in below the lift platform 10, so the detection of the intrusion of luggage into the luggage compartment 3 by the carry-in monitoring sensor 83 can be ignored.

The movable pulley position sensor 84 detects that the second sprocket 57, which is a movable pulley, is in a predetermined position. The movable pulley position sensor 84 is a proximity sensor and is provided at the rear of the guide frame 20 near three sides of the lower end position, the upper end position, and the middle position of the range of movement of the second sprocket 57. As shown in FIG. 12, when the movable pulley position sensor 84a on the side of the lower end position detects the presence of the second sprocket 57, the lift platform 10 is located at the top. In other words, the movable pulley position sensor 84a on the lower end position is a cart upper limit detection sensor that detects that the lift platform 10 is located at the top. As shown in FIG. 10, when the movable pulley position sensor 84b on the side of the upper end position detects the presence of the second sprocket 57, the lift platform 10 is located at the lower level (lowest level). In other words, the movable pulley position sensor 84b on the upper end position is a cart lower level detection sensor that detects that the lift platform 10 is located at the lower level. As shown in FIG. 11, when the movable pulley position sensor 84c on the side of the intermediate position detects the presence of the second sprocket 57, the lift platform 10 is located at the upper level (the height of the shelf board 5). In other words, the movable pulley position sensor 84c in the intermediate position is a cart upper level detection sensor that detects that the lift platform 10 is located at the upper level.

The retractable pin sensor 85 is a sensor that detects whether the retractable pin 77 of the fixing means 70 protrudes toward the locking hole. The retractable pin sensor 85 is a proximity sensor that detects whether the retractable pin 77 protrudes outward. The retractable pin sensor 85 is connected to the operation control unit of the drive actuator 51, and is configured to turn off the hydraulic switch of the drive actuator 51 when it detects that the retractable pin 77 has protruded and been inserted into the locking hole.

According to the lifting device 2 for the box-type cargo bed 1 described above, the guide frame 20, lifting slider 30, and lifting mechanism 50 are housed within the wall thickness t of the box-type cargo bed 1, so that no components other than the lifting platform 10 are placed in the storage space of the cargo room 3. Therefore, the cargo room 3 can be used effectively without narrowing the storage space of the cargo room 3.

In addition, because there is only one guide frame 20 on each side, the number of parts in the guide frame 20, lift slider 30, and lift mechanism 50 can be minimized. This simplifies the structure of the lift device 2 and reduces its weight.

The lifting device 2 of the box-type loading platform 1 of this embodiment is equipped with an upper stage sensor 82 that detects when the lifting platform 10 has reached the height of the upper loading platform surface (shelf board 5) and stops the lifting of the lifting platform 10 at the upper stage (shelf board 5) position, so that the lifting platform 10 can be prevented from rising too high and can be stopped at the height of the upper loading platform surface.

The lifting device 2 is also equipped with a fixing means 70 (support device) that supports the lifting platform 10 at its upper limit height, so that if the lifting platform 10 is supported by the fixing means 70 when the lifting platform 10 is not raised or lowered, such as when traveling, the load on the lifting mechanism 50 can be reduced. Since the support device of this embodiment supports the lifting platform 10 at its upper limit height, a large storage space can be secured below the lifting platform 10 when traveling. Furthermore, since the operating lever 74 can be operated from the rear of the platform body 11, it is not necessary to enter below the lifting platform 10 to switch the operating lever 74. This increases the safety of the work.

Furthermore, the lifting device 2 is equipped with an upper sensor 81 that detects when the upper end of the luggage 8 loaded on the lifting platform 10 reaches a predetermined height near the ceiling of the luggage compartment 3, and stops the lifting platform 10 from rising in response to detection by the upper sensor 81, thereby preventing the luggage 8 from colliding with the ceiling.

The lifting device 2 also has a movable pulley position sensor 84 that detects whether the second sprocket 57 is in one of three positions: the lower end position, the upper end position, or the intermediate position, so that the height position of the lifting platform 10 can be grasped.

In addition, the lifting device 2 is equipped with a retractable pin sensor 85 that detects whether the retractable pin 77 of the fixing means 70 protrudes toward the locking hole, so that it can reliably detect whether the lifting platform 10 is supported.

Although the embodiment for carrying out the present invention has been described above, the present invention is not limited to the above embodiment, and appropriate design changes are possible without departing from the spirit of the present invention. For example, in the above embodiment, the lifting mechanism 50 is provided behind the guide frame 20, but it may be provided in front of it.

REFERENCE SIGNS LIST 1 Box-shaped loading platform 2 Lifting device 3 Loading compartment 4 Floor surface 5 Shelf 8 Luggage 10 Lifting platform 20 Guide frame 30 Lifting slider 50 Lifting mechanism 70 Fixing means (support device)
81 Upper sensor 82 Upper stage sensor 83 Carry-in monitoring sensor t Wall thickness

Claims (5)

A lifting device provided behind a multi-level loading platform surface of a loading compartment of a box-type loading platform,
a lifting platform, a guide frame for guiding the lifting platform in an upward and downward direction, a lifting slider housed in the guide frame and lifting and lowering together with the lifting platform, and a lifting mechanism for lifting and lowering the lifting slider;
The guide frames are provided at both ends of the luggage compartment in the width direction, one on each side,
The guide frame, the lift slider, and the lift mechanism are accommodated within a wall thickness of the box-shaped loading platform,
The elevator further includes an upper sensor that detects when the upper end of the luggage loaded on the platform reaches a predetermined height near the ceiling of the luggage compartment.
A lifting device for a box-type loading platform. A lifting device provided behind a multi-level loading platform surface of a loading compartment of a box-type loading platform,
a lifting platform, a guide frame for guiding the lifting platform in an upward and downward direction, a lifting slider housed in the guide frame and lifting and lowering together with the lifting platform, and a lifting mechanism for lifting and lowering the lifting slider;
The guide frames are provided at both ends of the luggage compartment in the width direction, one on each side,
The guide frame, the lift slider, and the lift mechanism are accommodated within a wall thickness of the box-shaped loading platform,
The lifting platform further includes an upper level sensor for detecting when the lifting platform reaches the height of the upper level loading platform surface.
A lifting device for a box-type loading platform. A lifting device provided behind a multi-level loading platform surface of a loading compartment of a box-type loading platform,
a lifting platform, a guide frame for guiding the lifting platform in an upward and downward direction, a lifting slider housed in the guide frame and lifting and lowering together with the lifting platform, and a lifting mechanism for lifting and lowering the lifting slider;
The guide frames are provided at both ends of the luggage compartment in the width direction, one on each side,
The guide frame, the lift slider, and the lift mechanism are accommodated within a wall thickness of the box-shaped loading platform,
The vehicle further includes a carry-in monitoring sensor for detecting the presence or absence of luggage being carried into the luggage compartment.
A lifting device for a box-type loading platform. The box-type loading platform lifting device according to any one of claims 1 to 3, further comprising a stopper that stops the lifting of the lift platform at a predetermined height. The box-type loading platform lifting device according to any one of claims 1 to 4, further comprising a support device for supporting the lifting platform at a predetermined height.

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