Load elevating device

Abstract

To provide a load elevating device having high posture stability and excellent usability.SOLUTION: The load elevating device 1 comprises a base 2, a support column 3 erected on the base 2, a luggage receiving section 4 connected to the support column 3 so as to be vertically movable, a lifting mechanism 5 for moving the luggage receiving section 4 along the support column 3, a counterweight 7, and an auxiliary table 8 for supporting the counterweight 7. The luggage receiving section 4 has a fork 33 extending forward of the front end of the base 2 when viewed from above, and the auxiliary table 8 is provided at the rear of the base 2.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a luggage lifting device for lifting and lowering luggage. [Background technology]

[0002] BACKGROUND ART As a luggage lifting device used for loading and unloading luggage at high places, a luggage receiving section configured to be movable up and down along a support pillar has been proposed (for example, Patent Document 1).

[0003] The luggage lifting device of Patent Document 1 includes a carriage with multiple wheels, a support post attached to the carriage, and a cargo receiving unit (load receiving platform) connected to the support post so as to be vertically movable. The carriage has a rectangular U-shaped leg frame (frame body) extending forward from the lower end of the support post. The cargo receiving unit extends from the support post in the same direction as the leg frame and is connected to the support post so as to be vertically movable. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Jitsuzen Showa 61-178795 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned luggage lifting device, because the leg frames extend forward of the support columns, when the device is brought close to a loading platform such as a shelf, the leg frames may interfere with the bottom of the loading platform, making it impossible to position the loading / unloading section to a position suitable for loading and unloading luggage. On the other hand, if the leg frames are configured to be short so as not to interfere with the bottom of the loading platform, there is a risk that the device will tip toward the loading platform when a heavy object is placed on the loading platform.

[0006] The present invention has been made in view of the above problems, and has an object to provide a luggage lifting device that has high posture stability and is easy to use. [Means for solving the problem]

[0007] In order to solve the above problems, the luggage lifting device of the present invention employs the following technical measures.

[0008] A luggage lifting device according to one embodiment of the present invention comprises a base portion, a support pillar erected on the base portion, a luggage receiving portion connected to the support pillar so as to be movable up and down, a lifting mechanism portion for moving the luggage receiving portion along the support pillar, a counterweight, and an auxiliary platform portion for supporting the counterweight, wherein the luggage receiving portion has a fork extending forward of the front end of the base portion when viewed from above, and the auxiliary platform portion is provided at the rear of the base portion. [Effects of the Invention]

[0009] The luggage lifting device of the present invention can maintain a stable posture even when a heavy object is placed in the luggage receiving section. In addition, the leg frame is less likely to interfere with the bottom of the loading platform when brought close to the loading platform, improving usability. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is a side view of the luggage lifting device with the support poles extended. [Figure 2] FIG. 2 is a side view of the luggage lifting device with the support columns retracted. [Figure 3] FIG. 2 is a rear view of the luggage lifting device with the auxiliary table section detached. [Figure 4] FIG. 2 is a top view of the luggage lifting device with the auxiliary table detached. [Figure 5] FIG. 2 is a side view of the luggage lifting device in a folded state. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 10 is a partial cross-sectional side view of the periphery of the auxiliary stand connecting portion. [Figure 9] FIG. 2 is a schematic diagram of a luggage lifting device. [Figure 10] FIG. 10 is a side view of a luggage lifting device showing a first modified example. [Figure 11] FIG. 10 is a perspective view of the periphery of an auxiliary table connection portion of a luggage lifting device showing a first modified example. [Figure 12] FIG. 10 is a side view of a luggage lifting device showing a second modified example. [Figure 13] FIG. 10 is a perspective view of the periphery of an auxiliary table connection portion of a luggage lifting device showing a second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example of a specific embodiment of the present invention, and the configuration of the present invention is not limited to this specific example.

[0012] As shown in Fig. 1, the luggage lifting device 1 of this embodiment is a lifting device used to load and unload luggage P onto a loading platform S such as a shelf in a warehouse or a construction site. In this embodiment, a first direction parallel to a loading surface G of the luggage lifting device 1 (the direction indicated by arrows X1 and X2 in Figs. 1, 2, and 4) is referred to as a front-rear direction, a second direction parallel to the loading surface G and perpendicular to the first direction (the direction indicated by arrows Y1 and Y2 in Figs. 3 and 4) is referred to as a left-right direction, and a third direction perpendicular to each of the first and second directions (the direction indicated by arrows Z1 and Z2 in Figs. 1 to 3) is referred to as a up-down direction.

[0013] 1 to 4, the luggage lifting device 1 includes a base unit 2, a support column 3, a luggage receiving unit 4, a lifting mechanism unit 5, and a lifting battery 6. Furthermore, as shown in FIGS. 1, 2, and 4, the luggage lifting device 1 of this embodiment includes a counterweight 7, an auxiliary base unit 8, and an assist battery 9.

[0014] The base unit 2 is a support base that supports the support pole 3. As shown in FIGS. 2 to 4, the base unit 2 has a base main body 10, a leg frame 11, a leg connecting portion 12, wheels 13, auxiliary wheels 14, a main body handle 15, and an auxiliary base connecting portion 16.

[0015] The base body 10 is formed in the shape of a rectangular flat plate. A plurality of wheels 13 are provided on the bottom of the base body 10. The base body 10 is grounded on the support surface G by these wheels 13. The support pillar 3 is erected at the front of the base body 10. The leg frame 11 is a rectangular cylindrical frame body that is long in the front-to-rear direction. As shown in Figures 3 and 4, the leg frame 11 includes a left leg frame 11R and a right leg frame 11L. The left leg frame 11R is disposed on the left side of the base unit 2. The right leg frame 11L is disposed on the right side of the base unit 2. In this way, the leg frames 11 are disposed on the left and right sides of the base unit 2, with the base body 10 sandwiched between them. In other words, the leg frames 11 are disposed at the bottom of the support pillar 3 at intervals in the left-to-right direction.

[0016] As shown in Figs. 2 to 4, the leg frame 11 has a slide shaft 17. The slide shaft 17 is a rectangular cylindrical frame body that is long in the left-right direction. The slide shaft 17 extends from the inner surface of the leg frame 11 toward the inside in the left-right direction (toward the center between the left and right of the base part 2) and is inserted and held in the leg connecting part 12. In this embodiment, the slide shaft 17 is connected to a position closer to the rear of the center between the front and rear of the leg frame 11.

[0017] As shown in Figures 3 and 4, the slide shaft 17 (left slide shaft 17R) of the left leg frame 11R is inserted and supported from the left side of the base unit 2 into the left leg connector 12 of the base body 10. The slide shaft 17 (right slide shaft 17L) of the right leg frame 11L is inserted and supported from the right side of the base unit 2 into the right leg connector 12 of the base body 10. That is, the left slide shaft 17R is supported so as to be slidable in the left-right direction relative to the leg connector 12 on the left side of the base body 10. On the other hand, the right slide shaft 17L is supported so as to be slidable in the left-right direction relative to the leg connector 12 on the right side of the base body 10. In this way, the leg connectors 12 support the left and right leg frames 11 so as to be movable in the left-right direction, respectively.

[0018] As shown in FIGS. 2 and 3, the leg connector 12 is provided at the bottom of the base body 10. As shown in FIG. 4, the left and right leg connectors 12 are arranged eccentrically in the front-rear direction at positions closer to the front of the base body 10. Specifically, the left leg connector 12 is provided at the left front portion of the base body 10. On the other hand, the right leg connector 12 is eccentrically provided at a position rearward of the left leg connector 12 at the right front portion of the base body 10. Therefore, when the left sliding shaft 17R and the right sliding shaft 17L are slid toward the center of the base unit 2, they are arranged side by side in the front-rear direction without interfering with each other. At this time, the left leg frame 11R is arranged along the left side of the base body 10. On the other hand, the right leg frame 11L is arranged along the right side of the base body 10.

[0019] As shown in Figures 2 and 4, wheels 13 include base front wheels 13A, base middle wheels 13B, and base rear wheels 13C. Furthermore, in this embodiment, wheels 13 include auxiliary base front wheels 13D and auxiliary base rear wheels 13E. Base front wheels 13A, base middle wheels 13B, and base rear wheels 13C are each provided as a pair on the left and right at the bottom of base unit 2, and movably support base unit 2. As shown in Figures 4 and 6, auxiliary base front wheels 13D and auxiliary base rear wheels 13E are each provided as a pair on the left and right at the bottom of auxiliary base unit 8, and movably support auxiliary base unit 8.

[0020] As shown in Figures 2 and 4, the base front wheel 13A is provided at the front end T1 of the leg frame 11. The base middle wheel 13B is provided at the rear end T2 of the leg frame 11. In this way, the leg frame 11 has two wheels 13 (the base front wheel 13A and the base middle wheel 13B), one at the front and one at the rear. The front end T1 of the leg frame 11 is located at the forefront of the base unit 2. In other words, the front end T1 of the leg frame 11 corresponds to the front end of the base unit 2.

[0021] As shown in Figures 3 and 4, base rear wheels 13C are arranged at the rear of base main body 10 with a gap between them on the left and right. Base rear wheels 13C are provided below auxiliary base connecting part 16. As shown in Figure 4, leg frame 11 is arranged in front of auxiliary base connecting part 16 when in a folded state arranged along the side of base main body 10. As a result, base front wheels 13A, base middle wheels 13B, and base rear wheels 13C are arranged in a line in the front-to-rear direction.

[0022] On the other hand, in the deployed state where the leg frames 11 are moved outward in the left-right direction (outside the base unit 2) from the sides of the base body 10, the base front wheels 13A and the base middle wheels 13B are positioned together with the leg frames 11 at positions spaced apart from the base body 10 outward in the left-right direction. This allows the base unit 2 to be stably placed on the mounting surface G, and wobbling of the support columns 3 is suppressed.

[0023] As described above, the base unit 2 contacts the placing surface G with a total of six wheels, including two wheels of the rear base wheels 13C provided on the base main body 10, and four wheels of the front base wheels 13A and middle base wheels 13B provided on the leg frame 11. On the other hand, the auxiliary base unit 8 contacts the placing surface G with four wheels of the front auxiliary base wheels 13D and rear auxiliary base wheels 13E.

[0024] As shown in Figs. 1 to 3, the support column 3 extends upward from the front of the base body 10. As shown in Figs. 1, 2 and 4, the support column 3 has a base support column 21 and a movable support column 22. In this embodiment, the support column 3 has three movable support columns 22 (a first movable support column 22A, a second movable support column 22B and a third movable support column 22C). The movable support 22 is a frame body in the shape of a flat rectangular plate that is long in the vertical direction.

[0025] 1 and 2, the foundation support pillar 21 is fixedly connected at its lower end to the front part of the base body 10 and extends above the base body 10. In this embodiment, the foundation support pillar 21 is inclined rearward from the base part 2 from its lower end to its upper end. Similar to the foundation support pillar 21, the movable support pillar 22 is also inclined rearward from the base part 2 from its lower end to its upper end.

[0026] Of the movable columns 22, the first movable column 22A is provided overlapping the front surface of the foundation column 21 and is connected to the foundation column 21 so as to be slidable in the extension direction thereof. The second movable column 22B is provided overlapping the front surface of the first movable column 22A and is connected to the first movable column 22A so as to be slidable in the extension direction thereof. The third movable column 22C is provided overlapping the front surface of the second movable column 22B and is connected to the second movable column 22B so as to be slidable in the extension direction thereof. In this way, each movable column 22 is connected to the movable column 22 or foundation column 21 opposite to its rear surface so as to be vertically movable.

[0027] The movable support columns 22 are set to have approximately the same length as the foundation support columns 21. Therefore, as shown in Figure 2, when the movable support columns 22 are lined up in a stacked manner in front of the foundation support columns 21, the height of each movable support column 22 is approximately the same as the height of the foundation support columns 21. In this way, the support columns 3 can be shortened to the height position of the foundation support columns 21.

[0028] As shown in FIGS. 2 to 4, the training wheels 14 are provided at the rear of the foundation support 21. More specifically, the foundation support 21 has an auxiliary frame 23. The auxiliary frame 23 extends rearward from the rear of the foundation support 21. The training wheels 14 are rotatably connected to the rear end of the auxiliary frame 23. The training wheels 14 are arranged at the rear end of the auxiliary frame 23 at intervals in the left-right direction. Therefore, when the auxiliary stand 8 is separated from the base 2 and the support 3 is tilted rearward, the training wheels 14 come into contact with the placement surface G and movably support the base 2.

[0029] The main body handles 15 are provided at the rear end of the auxiliary frame 23. More specifically, the main body handles 15 extend outward in the left-right direction from the outer ends of the axles of the left and right auxiliary wheels 14. Therefore, the user can manually move the base unit 2 using the left and right main body handles 15.

[0030] The auxiliary table connecting parts 16 are provided at the rear of the base body 10. As shown in Figures 3 and 4, in this embodiment, the auxiliary table connecting parts 16 are provided at the left rear and right rear of the base body 10. In other words, the auxiliary table connecting parts 16 are arranged at the rear of the base body 10 with a gap between them in the left-right direction.

[0031] As shown in Figures 7 and 8, auxiliary base connecting part 16 is formed in a rectangular cylindrical shape. Auxiliary base connecting part 16 has a connection port 24 and a pin insertion hole 25. Connection port 24 opens toward the rear of base part 2 and communicates with the inner space of auxiliary base connecting part 16. Pin insertion hole 25 is formed through side plate part 16S of auxiliary base connecting part 16 and communicates with the inner space of auxiliary base connecting part 16.

[0032] As shown in Figures 2 and 4, the goods receiving section 4 is connected to the front of the third movable support column 22C. The goods receiving section 4 has a base section 30, a support frame 31, a socket 32, and a fork 33. The base section 30 is a flat rectangular plate-shaped frame body that is long in the vertical direction. The base section 30 is provided on top of the front of the third movable support column 22C and is connected to the third movable support column 22C so as to be slidable in the extension direction of the third movable support column 22C. In this way, the goods receiving section 4 is connected to the support column 3 so as to be able to move up and down.

[0033] The support frame 31 is a rectangular cylindrical frame body that is long in the left-right direction and is installed horizontally at the front of the base plate unit 30. The sockets 32 are rectangular cylindrical bodies that are slightly larger than the support frame 31 and are installed at the left and right ends of the support frame 31. The sockets 32 are detachably attached to the ends of the support frame 31. The forks 33 are rectangular frame bodies that are long in the front-rear direction and are supported in a cantilevered manner on the front peripheral surface 32F of the socket 32. In this way, the forks 33 are detachably connected to the left and right ends of the support frame 31 via the sockets 32. The left and right forks 33 are arranged parallel to each other at a predetermined distance in front of the base plate unit 30.

[0034] In use with the socket 32 ​​attached to the end of the support frame 31 with the front peripheral portion 32F facing forward, the forks 33 extend forward from the peripheral portion of the socket 32. At this time, the front end portions T3 of the forks 33 are positioned forward of the front end portions T1 of the leg frames 11. Therefore, as shown in FIG. 1, even when the luggage lifting device 1 is brought close to the loading platform S, the forks 33 can be positioned close to the top S1 of the loading platform S (the loading and unloading position for luggage P) before the front end portions T1 of the leg frames 11 interfere with the loading platform S.

[0035] 5, for example, by attaching the socket 32 ​​to the end of the support frame 31 with the front peripheral surface 32F facing upward, the goods receiving section 4 can be folded with the forks 33 facing upward. In this case, the front ends T3 of the forks 33 are positioned rearward of the front ends T1 of the leg frames 11.

[0036] The lifting mechanism 5 is a drive mechanism that moves the movable columns 22 up and down. As shown in Figs. 2 to 4, the lifting mechanism 5 has a wire 34, a winch drum 35, and a lifting motor 36. Furthermore, as shown in Fig. 9, the lifting mechanism 5 has a lifting operation unit 37, a connection sensor 38, and a first control device 5C.

[0037] The wire 34 extends from the foundation support 21 through the first movable support 22A, the second movable support 22B, and the third movable support 22C in this order to the base 30 of the goods receiving section 4. The winch drum 35 is rotatably connected to the lifting motor 36. That is, the winch drum 35 is rotated by the lifting motor 36.

[0038] As shown in Figures 2 to 4, the lifting motor 36 is supported at the rear of the foundation support 21. The lifting motor 36 rotates the winch drum 35 to wind and unwind the wire 34 onto and from the winch drum 35. Note that the lifting mechanism 5 may not be equipped with the lifting motor 36, and the winch drum 35 may be rotated manually using a winch handle.

[0039] As shown in Fig. 9, the lift motor 36 is connected to the lift battery 6 through electrical wiring and is driven by power supplied from the lift battery 6. As shown in Figs. 1 to 3, the lift battery 6 is disposed below the base body 10. The lift battery 6 is provided in a rearward position between the front and rear of the base body 10. As shown in Figs. 2 and 4, in this embodiment, the lift battery 6 is disposed between the left and right base middle wheels 13B.

[0040] As shown in FIG. 1, the foundation support 21, the first movable support 22A, the second movable support 22B, the third movable support 22C, and the base plate 30 each have a wire sheave R1. A wire 34 is engaged with each of the wire sheaves R1 of the first movable support 22A, the second movable support 22B, the third movable support 22C, and the base plate 30. Therefore, when the wire 34 is wound onto the winch drum 35 as described above, the first movable support 22A, the second movable support 22B, the third movable support 22C, and the base plate 30 are pulled up in the extension direction in conjunction with this. As a result, the support 3 extends upward, moving the load receiving section 4 upward.

[0041] 2, 3, and 9, the lifting / lowering operation unit 37 is a controller that controls the raising and lowering of the goods receiving unit 4, and is connected to the first control device 5C via electrical wiring. The connection sensor 38 is a sensor that detects whether the auxiliary platform 8 is connected to the base 2, and is connected to the first control device 5C via electrical wiring. The connection sensor 38 will be described in detail later.

[0042] The first control device 5C has a lift control unit C1. The lift control unit C1 controls the operation of the lift motor 36 in response to the lift operation by the lift operation unit 37. The lift control unit C1 also has a lift limiting function that limits the operation of the lift motor 36 when the connection sensor 38 is in the OFF state. The lift limiting function will be described later. The lift control unit C1 may be configured to be able to arbitrarily switch the lift limiting function on and off.

[0043] As shown in Figures 4 to 6, the counterweight 7 is placed on the auxiliary base 8. In this embodiment, the counterweight 7 is a flat rectangular plate, and multiple counterweights 7 are placed on top of each other on the auxiliary base main body 40. As shown in Figure 6, the counterweight 7 is removably attached to the auxiliary base main body 40 by one or more fixing members J1. Therefore, the number of counterweights 7 mounted on the auxiliary base 8 can be increased or decreased as desired (for example, depending on the weight of the luggage P).

[0044] In this embodiment, the counterweight 7 is fixed to the auxiliary base main body 40 by two fixing members J1. Two fixing members J1 are arranged side by side in the longitudinal direction of the counterweight 7. The fixing members J1 are composed of long bolts and nuts. The long bolts are installed to penetrate the stacked counterweights 7 from above and below, and are fixed by the nuts. This reliably prevents the counterweight 7 from falling off the auxiliary base part 8.

[0045] As shown in Figures 1 and 2, the auxiliary base 8 is provided at the rear of the base 2. As shown in Figures 4 and 5, in this embodiment, the auxiliary base 8 is detachably connected to the base 2. The auxiliary base 8 has an auxiliary base main body 40, wheels 13, an auxiliary handle 41, and a battery stay 42. Furthermore, as shown in Figure 9, the auxiliary base 8 has a drive motor 43, an operation sensor 44, and a second control device 8C.

[0046] As shown in Figures 4 to 6, auxiliary table main body 40 is formed in the shape of a rectangular flat plate. A plurality of wheels 13 are provided on the lower part of auxiliary table main body 40. Auxiliary table main body 40 is placed on the placement surface G by these wheels 13 (auxiliary table front wheels 13D and auxiliary table rear wheels 13E). An auxiliary handle 41 is provided upright on the rear part of the upper surface of auxiliary table main body 40. Thus, in this embodiment, auxiliary table part 8 has the basic structure of a single-arm hand truck.

[0047] As shown in Figure 6, the auxiliary handle 41 is a frame bent into a substantially U-shape and includes an upper frame 45 and side frames 46. The upper frame 45 extends in the left-right direction above the rear of the auxiliary stand main body 40. The side frames 46 extend downward from the left and right ends of the upper frame 45 and are connected at their lower ends to the auxiliary stand main body 40. The battery stay 42 is provided between the left and right side frames 46. The battery stay 42 is a plate that is long in the left-right direction and is connected at its left and right ends to the side frames 46.

[0048] As shown in Figs. 4 to 6, the auxiliary table main body 40 has a top plate 47 and a connecting frame 48. The top plate 47 is a rectangular plate. As shown in Figs. 4 and 5, in this embodiment, The top plate 47 is formed with a front-to-rear width at least twice that of the counterweight 7. Therefore, the auxiliary base 8 can be moved together with the counterweight 7 with a load P of a predetermined size placed on it.

[0049] The connecting frame 48 is a rectangular cylindrical frame body that is long in the front-rear direction, and extends in the front-rear direction along the lower left and right side edges of the top plate 47. That is, the connecting frames 48 are provided on the left and right sides of the auxiliary table main body 40. As shown in FIGS. 4 and 7, the front end T4 of the connecting frame 48 protrudes forward beyond the front edge of the top plate 47, is inserted into the auxiliary table connecting portion 16, and is held in place by a fixing pin 50 (see FIG. 2).

[0050] 5 and 7, the connecting frame 48 has a pin insertion hole 51. The pin insertion hole 51 penetrates through a side surface portion 48S of the connecting frame 48 and communicates with the interior space of the connecting frame 48. The pin insertion hole 51 of the connecting frame 48 is a circular hole having approximately the same diameter as the pin insertion hole 25 of the auxiliary base connecting portion 16.

[0051] The front end T4 of the connecting frame 48 is inserted into the auxiliary base connecting part 16 from the connection port 24 until the pin insertion holes 51, 25 overlap each other. In this state, the fixing pin 50 is inserted into the pin insertion holes 51, 25, so that the connecting frame 48 is connected to the auxiliary base connecting part 16 in a non-detachable state. In this way, the auxiliary base part 8 is connected and fixed to the base part 2 by the fixing pin 50 (see FIG. 2).

[0052] Furthermore, when the fixing pin 50 is removed from the pin insertion holes 51 and 25 while the auxiliary base 8 is connected to the base 2 as described above, the connecting frame 48 can be removed from the auxiliary base connecting portion 16. In other words, by removing the fixing pin 50 from the pin insertion holes 51 and 25, the auxiliary base 8 can be separated from the base 2.

[0053] In this embodiment, the fixing pin 50 is a ball lock pin that is inserted into the pin insertion holes 51, 25, and is thereby held in a non-removable state in the pin insertion holes 51, 25. Note that the fixing pin 50 is not limited to a ball lock pin, and may be a toggle pin with a bendable tip, or a screw member that can be threadably connected to the pin insertion holes 51, 25.

[0054] As shown in FIG. 9, the connection sensor 38 is a sensor that detects whether or not the connection frame 48 is inserted into the auxiliary table connection portion 16, and is connected to the first control device 5C via an electric wiring.

[0055] As shown in FIG. 8 , in this embodiment, the connection sensor 38 is an on-off switch and is provided on the auxiliary table connection part 16 with the detector 38T facing the interior of the auxiliary table connection part 16. Therefore, the connection sensor 38 is turned on when the front end T4 of the connecting frame 48 is inserted into the auxiliary table connection part 16 to a predetermined position and the front end T4 comes into contact with the detector 38T. When the connection sensor 38 is in the off state (when the connection sensor 38 detects that the auxiliary table 8 is not connected), i.e., when the auxiliary table 8 is not connected to the base 2, the lift control part C1 prohibits operation of the lift motor 36 to restrict the lifting and lowering of the receiver 4. This makes it possible to restrict the lifting and lowering of heavy luggage P when no counterweight 7 is mounted on the rear of the base 2.

[0056] 4 and 6, the drive motor 43 is connected to the auxiliary base rear wheels 13E. That is, the auxiliary base unit 8 has drive wheels (auxiliary base rear wheels 13E) that are driven by the drive motor 43. In this embodiment, the drive motor 43 is provided on each of the left and right auxiliary base rear wheels 13E.

[0057] As shown in Fig. 9, the drive motor 43 is connected to the assist battery 9 through electrical wiring and is driven by power supplied from the assist battery 9. As shown in Figs. 4 to 6, in this embodiment, the assist battery 9 is supported on the rear surface of the battery stay 42. As shown in Figs. 4 and 6, the assist battery 9 is disposed in the center between the left and right sides of the battery stay 42.

[0058] The assist battery 9 may be supported on the front surface of the battery stay 42 as long as this does not impair the ease of attaching and detaching the counterweight 7 to the auxiliary base main body 40 or the weight balance (stability during movement) of the auxiliary base part 8. Alternatively, the assist battery 9 may be disposed on the upper surface of the auxiliary base main body 40 or on the lower surface of the auxiliary base main body 40.

[0059] 9, the operation sensor 44 is a sensor that detects the pushing and pulling operation of the auxiliary base 8, and is connected to the second control device 8C via electrical wiring. The second control device 8C has an assist control unit C2. The assist control unit C2 controls the operation of the drive motor 43 based on the detection information of the operation sensor 44 and preset operating conditions.

[0060] In this embodiment, the operation sensor 44 is a pressure sensor provided on the upper frame 45 of the auxiliary handle 41. When the operation sensor 44 detects that the auxiliary base 8 has been pushed forward, the assist control unit C2 causes the drive motor 43 to apply a predetermined torque in the forward direction (positive rotation direction) to the auxiliary base rear wheels 13E. On the other hand, when the operation sensor 44 detects that the auxiliary base 8 has been pulled rearward, the assist control unit C2 causes the drive motor 43 to apply a predetermined torque in the backward direction (negative rotation direction) to the auxiliary base rear wheels 13E. This makes it possible to easily move the auxiliary base 8 alone, detached from the luggage lifting device 1 or the base 2, even when the counterweight 7 is mounted on the auxiliary base main body 40.

[0061] In addition, the operation sensor 44 is not limited to a pressure sensor, but may be an on / off switch provided on the auxiliary handle 41 to operate the forward and reverse movement of the auxiliary base 8, or an accelerator position sensor provided on the upper frame 45 of the auxiliary handle 41 to detect the opening degree (rotation position) of an accelerator grip.

[0062] <Modification> In the above embodiment, the auxiliary stand 8 is detachably connected to the base 2, but it may also be connected to the base 2 so as to be movable in the front-to-rear direction. In detail, as shown in Fig. 10, in this embodiment (first modified example), the rear part of the auxiliary stand 8 is grounded on the placement surface G by the auxiliary stand rear wheels 13E, and the front part is supported by the auxiliary stand connecting part 16 of the base 2 so as to be slidable in the front-to-rear direction.

[0063] The top plate 47 of the auxiliary base main body 40 is formed with approximately the same front-to-rear width as the counterweight 7. The connecting frame 48 extends and protrudes forward beyond the front edge of the top plate 47. The auxiliary base connecting portion 16 is open in the front-to-rear direction. The connecting frame 48 is inserted into the auxiliary base connecting portion 16 from rear to front.

[0064] 11 , in this embodiment, the connecting frame 48 has two pin insertion holes 51, 52. Of the two pin insertion holes 51, 52, the first pin insertion hole 51 is provided at a position closer to the front end T4 on the side surface portion 48S of the connecting frame 48. Therefore, by fixing the connecting frame 48 to the auxiliary base connecting portion 16 at the first pin insertion hole 51, the auxiliary base 8 can be disposed at a position away from the rear of the base 2.

[0065] On the other hand, the second pin insertion hole 52 is provided at a position further rearward than the first pin insertion hole 51 in the side surface portion 48S of the connecting frame 48. The auxiliary base 8 is provided at a position on the side surface 48S of the connecting frame 48 near the front edge of the top plate 47. Therefore, the auxiliary base 8 can be disposed adjacent to the rear of the base 2 by fixing the connecting frame 48 to the auxiliary base connecting portion 16 using the second pin insertion holes 52 (see FIG. 10).

[0066] The luggage lifting device 1 of this embodiment is easy to use because, when in use, it can be in an unfolded state with the auxiliary table 8 arranged at a distance behind the base table 2, and when stored, it can be in a folded state with the auxiliary table 8 arranged adjacent to the rear of the base table 2. Furthermore, the luggage lifting device 1 can be transformed between the unfolded state and the folded state simply by sliding the auxiliary table 8 back and forth, making it even easier to use.

[0067] The auxiliary base 8 may be configured to be swingable between an unfolded position (first position) in which it is disposed behind the base 2, and a folded position (second position) in which it stands on top of the base 2. More specifically, as shown in FIG. 12 , in this embodiment (second modified example), the rear portion of the auxiliary base 8 is grounded on the placement surface G by the auxiliary base rear wheels 13E, and the front portion is rotatably connected to the auxiliary base connecting portion 16 of the base 2. In this embodiment, the auxiliary handle 41 is configured by a pair of rod-shaped frames that are erected at the rear of the auxiliary base main body 40 with a gap between them in the left-right direction. This prevents the auxiliary handle 41 from interfering with the lifting mechanism 5, the support column 3, etc., even when the auxiliary base 8 is in the folded position.

[0068] The connecting frame 48 extends and protrudes forward beyond the front edge of the tabletop 47, and is connected to and supported by the auxiliary table connecting portion 16. As shown in FIG. 13, the auxiliary table connecting portion 16 has a pair of left and right side plate portions 16S. These side plate portions 16S are arranged side by side with a gap between them in the left-right direction. A front end portion T4 of the connecting frame 48 is inserted from the rear into the gap between the side plate portions 16S, and is rotatably connected to the side plate portions 16S by a support shaft 53.

[0069] The side plate 16S has two pin insertion holes 54, 55. Of the two pin insertion holes 54, 55, the first pin insertion hole 54 is positioned on a rear extension of the support shaft 53 on the side plate 16S. On the other hand, the second pin insertion hole 55 is positioned on an upward extension of the support shaft 53 on the side plate 16S. Therefore, the auxiliary base 8 can be disposed at a rear position of the base 2 by fixing the connecting frame 48 to the auxiliary base connecting portion 16 via the first pin insertion hole 54. On the other hand, the auxiliary base 8 can be held in an upright position above the base 2 by fixing the connecting frame 48 to the auxiliary base connecting portion 16 via the second pin insertion hole 55 (see FIG. 12 ).

[0070] As such, the luggage lifting device 1 of this embodiment comprises a base section 2, a support pillar 3 erected on the base section 2, a luggage receiving section 4 connected to the support pillar 3 so as to be movable up and down, a lifting mechanism section 5 that moves the luggage receiving section 4 along the support pillar 3, a counterweight 7, and an auxiliary platform section 8 that supports the counterweight 7, and the luggage receiving section 4 has a fork 33 that extends forward of the front end of the base section 2 when viewed from above, and the auxiliary platform section 8 is provided at the rear of the base section 2.

[0071] With this luggage lifting device 1, the leg frame 11 is unlikely to interfere with the loading platform S even when it is brought close to the loading platform S, and the luggage receiving section 4 can be positioned in a position suitable for loading and unloading luggage P. Moreover, even when a heavy luggage P is placed on the luggage receiving section 4, the counterweight 7 placed on the auxiliary platform 8 maintains the weight balance between the front and rear of the device 1. This makes it possible to provide a luggage lifting device 1 that is highly stable in posture and easy to use.

[0072] The auxiliary stand portion 8 is detachably connected to the base portion 2 .

[0073] According to the luggage lifting device 1, the auxiliary platform 8 can be connected to the base 2 as needed, or the base 2 can be connected to the auxiliary platform 8 as needed. Since the counterweight 7 can be easily separated from the base part 2, it becomes possible to easily place the counterweight 7 on and remove it from the base part 2. This further improves usability.

[0074] The auxiliary base 8 has an auxiliary handle 41 that can be held by the user, and wheels 13 that support the auxiliary base 8.

[0075] According to the luggage lifting device 1, the auxiliary platform 8 can be moved by hand by separating it from the base 2, and the counterweight 7 can be easily carried. This further improves usability.

[0076] The auxiliary base 8 has a drive motor 43 that drives the wheels 13, an operation sensor 44 that detects pushing and pulling operations of the auxiliary base 8, and an assist control unit C2 that applies a predetermined torque from the drive motor 43 to the wheels 13 when the operation sensor 44 detects a moving operation of the auxiliary base 8.

[0077] According to the luggage lifting device 1, it is possible to easily move the luggage lifting device 1 or the auxiliary table 8 even when the counterweight 7 is placed on the auxiliary table 8. This further improves usability.

[0078] The lifting mechanism 5 includes a lifting motor 36 that raises and lowers the cargo receiving section 4, a lifting operation section 37 that controls the lifting and lowering operation of the cargo receiving section 4, a connection sensor 38 that detects the connection state of the auxiliary base section 8 to the base section 2, and a lifting control section C1 that prohibits the operation of the lifting motor 36 when the connection sensor 38 detects that the auxiliary base section 8 is not connected.

[0079] According to the luggage lifting device 1, it is possible to restrict the lifting and lowering of the luggage P when the counterweight 7 is not mounted on the rear part of the base part 2. This improves safety.

[0080] The base portion 2 has a pair of leg frames 11 arranged at a distance in the left-right direction at the bottom of the support 3, each extending in the front-to-back direction, and a leg connecting portion 12 that supports the leg frames 11 so that they can each move in the left-to-right direction.

[0081] According to the luggage lifting device 1, by moving the left and right leg frames 11 in the left and right directions, the base part 2 can be placed on the loading surface G in a more stable position, thereby further improving safety and ease of use.

[0082] The auxiliary stand 8 is connected to the base 2 so as to be movable in the front-rear direction.

[0083] According to the luggage lifting device 1, by moving the auxiliary platform 8 rearward of the base 2, the counterweight 7 can be positioned at a distance behind the base 2, thereby more stabilizing the front-to-rear weight balance of the device 1. This further improves safety and ease of use. In addition, the forward-to-rear position of the counterweight 7 can be adjusted as desired to suit the usage environment, resulting in even better usability.

[0084] The auxiliary base portion 8 is connected to the base portion 2 so that it can swing between a first position in which it is arranged side by side behind the base portion 2 and a second position in which it is arranged upright on top of the base portion 2.

[0085] According to the luggage lifting device 1, the auxiliary platform 8 is placed in the first position in parallel with the rear of the base platform 2. By doing so, the counterweight 7 can be placed at a distance behind the base 2, which makes the front-to-rear weight balance of the device 1 more stable. This further improves safety and ease of use. In addition, by setting the auxiliary base 8 in the second position, standing above the base 2, the entire device 1 can be folded compactly, resulting in even better usability. [Explanation of symbols]

[0086] 1. Luggage lifting device 2 Base 3 pillars 4 Receiving section 5 Lifting mechanism 6 Lift battery 7 Counterweight 8 Auxiliary stand 9 Assist battery 10 Base body 11 Leg frame 12 Leg connection 13 wheels 16 Auxiliary stand connection part 33 Fork 36 Lifting motor 37 Lifting control unit 38 Connected Sensors 41 Auxiliary handle 43 Drive motor 44 Operation Sensor C1 Lift control section C2 Assist control unit P Luggage S cargo bed T1 Front end of leg frame (front end of base) T3 fork front end

Claims

1. A base portion; A support pillar erected on the base portion; A cargo receiving section that is connected to the support column so as to be vertically movable; a lifting mechanism that moves the receiving unit along the support pillar; A counterweight and an auxiliary base portion that supports the counterweight, The cargo receiving portion has a fork that extends forward beyond the front end of the base portion when viewed from above, The auxiliary platform is a luggage lifting device provided at the rear of the base.

2. 2. The luggage lifting device according to claim 1, wherein the auxiliary platform is detachably connected to the base platform.

3. The auxiliary base portion is An auxiliary handle that can be held by a user; 3. The luggage lifting device according to claim 1, further comprising: wheels for supporting the auxiliary platform.

4. The auxiliary base portion is a drive motor that drives the wheels; an operation sensor that detects a push / pull operation of the auxiliary stand; 4. The luggage lifting device according to claim 3, further comprising an assist control section that applies a predetermined torque from the drive motor to the wheels when the operation sensor detects a movement operation of the auxiliary base section.

5. The lifting mechanism includes: a lifting motor for lifting and lowering the cargo receiving section; a lifting operation unit for operating the lifting operation of the cargo receiving unit; a connection sensor that detects a connection state of the auxiliary base portion with respect to the base portion; 3. The luggage lifting device according to claim 2, further comprising a lifting control unit that inhibits operation of the lifting motor when the connection sensor detects that the auxiliary base is not connected.

6. The base portion is a pair of leg frames disposed at a lower portion of the support column at a distance in the left-right direction and extending in the front-rear direction; 2. The luggage lifting device according to claim 1, further comprising: leg connectors that support the leg frames so that they can move in the left-right direction.

7. 2. The luggage lifting device according to claim 1, wherein the auxiliary platform is connected to the base platform so as to be movable in the front-rear direction.

8. The luggage lifting device according to claim 1, wherein the auxiliary platform is swingably connected to the base platform between a first position in which the auxiliary platform is arranged in parallel to the rear of the base platform and a second position in which the auxiliary platform is arranged upright on top of the base platform.

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