Loading platform lifting device and vehicle
Patent Information
- Application Number
- JP2023131012
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-08-10
- Publication Date
- 2025-02-21
Smart Images
Figure 2025025845000001_ABST
Abstract
Description
[Technical field]
[0001] The present specification relates to a platform lifting device and a vehicle. [Background technology]
[0002] Conventionally, for example, a load-receiving platform lifting device includes a safety bar extending laterally below the cross member and a detector that detects when the safety bar has risen to a detection position (for example, Patent Document 1). When it is detected that the safety bar has risen to the detection position, the lifting of the load-receiving platform is stopped.
[0003] However, in the loading platform lifting device disclosed in Patent Document 1, the lower end of the safety bar is higher than the lower end of the cross member at the detection position, which may cause a load on the loading platform to hit the cross member before the detector detects that the safety bar has risen to the detection position. [Prior art documents] [Patent documents]
[0004] [Patent Document 1] JP 2000-71853 A Summary of the Invention [Problem to be solved by the invention]
[0005] Therefore, an object of the present invention is to provide a loading platform lifting device and a vehicle that can prevent luggage on the loading platform from hitting the cross member. [Means for solving the problem]
[0006] The loading platform lifting device is A pair of cylindrical supports extending in the vertical direction; A tubular cross member extending laterally and connecting the pair of pillars; A load receiving platform that moves vertically relative to the support pillar; A control unit for controlling the movement of the loading platform; a safety bar extending in the lateral direction and connected to at least one of the cross member and the support pillar so as to be movable in an up-down direction relative to the cross member; A detection unit that detects when the safety bar has risen to a detection position, The control unit stops the lifting of the load receiving platform when the detection unit detects that the safety bar has been lifted to a detection position, At the detection position, the lower end of the safety bar is lower than the lower end of the cross member.
[0007] The vehicle is The loading platform lifting device; and a loading platform to which the loading platform lifting device is attached. [Brief description of the drawings]
[0008] [Figure 1] FIG. 2 is a perspective view of the load receiving platform lifting device according to the embodiment, showing a state in which the lifting unit is located at the use position and the load receiving platform is located at the lower end position in the load receiving posture. [Diagram 2] FIG. 2 is a perspective view of the load receiving platform lifting / lowering device according to the embodiment, illustrating a state in which the lifting unit is located at the use position and the load receiving platform is located at the upper end position in the load receiving posture. [Diagram 3] FIG. 2 is a perspective view of the load receiving platform lifting / lowering device according to the embodiment, illustrating a state in which the lifting unit is located at the use position and the load receiving platform is in the storage position; [Figure 4] FIG. 2 is a perspective view of the loading platform lifting / lowering device according to the embodiment, showing a state in which the lifting / lowering unit is located in an unused position; [Diagram 5] FIG. 2 is a perspective view of the loading platform lifting / lowering device according to the embodiment, showing a state in which the lifting / lowering unit is located at a storage position. [Figure 6] FIG. 2 is a front view (viewed forward) of the load receiving platform lifting device according to the embodiment, showing a state in which the load receiving platform is positioned at the lower end position in the load receiving posture. [Figure 7] FIG. 2 is a right-side view of the load-receiving platform lifting device according to the embodiment, showing a state in which the load-receiving platform is positioned at the bottom end position in the load-receiving posture. [Figure 8] FIG. 2 is a right-side view of the load-receiving platform lifting device according to the embodiment, showing a state in which the load-receiving platform is positioned at the upper end position in the load-receiving posture. [Figure 9] FIG. 1 is a diagram showing a main part of the loading platform lifting device according to the embodiment (a: rearward view, b: cross-sectional view taken along line IX-IX in a). [Figure 10] FIG. 7 is an enlarged view of the X region in FIG. 6, showing a state in which the detachable wall (rear wall) of the cross member has been detached. [Figure 11] FIG. 11 is a cross-sectional view of a main part taken along line XI-XI in FIG. 10, showing a state in which the safety bar is located at a reference position; [Figure 12] FIG. 12 shows the state in which the safety bar is in the detection position from the state in FIG. 11. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0009] In each drawing, the dimensions of the components may be enlarged or reduced relative to the actual dimensions in order to facilitate understanding, and the dimensional ratios between the drawings may not be consistent. Note that in each drawing, some of the components may be omitted in order to facilitate understanding.
[0010] Terms including ordinal numbers such as first, second, etc. are used to describe various components, but these terms are used only for the purpose of distinguishing one component from another, and the components are not particularly limited by these terms. The number of components including ordinal numbers is not particularly limited, and may be, for example, one. In addition, the ordinal numbers used in the following specification and drawings may differ from the ordinal numbers described in the claims.
[0011] In the following description, the first direction (first horizontal direction) D1 is also called the front-rear direction D1, and the direction of the arrow in the figure is the front direction, and the direction opposite to the arrow in the figure is the rear direction. The second direction (second horizontal direction) D2 is also called the left-right direction D2, and the direction of the arrow in the figure is the left direction, and the direction opposite to the arrow in the figure is the right direction.
[0012] The third direction D3 is also called the up-down direction D3, and the direction of the arrow in each drawing is the up direction, and the direction opposite to the arrow in each drawing is the down direction. That is, each of the directions D1 to D3 is a direction seen by a person (driver) sitting in the driver's seat of the vehicle.
[0013] Hereinafter, an embodiment of the vehicle and the loading platform lifting / lowering device will be described with reference to Figures 1 to 12. Note that the following embodiment is provided as an example to aid in understanding the configuration of the vehicle and the loading platform lifting / lowering device, and is not intended to limit the configuration of the vehicle and the loading platform lifting / lowering device.
[0014] 1, the vehicle 1 may include, for example, a vehicle body 2, a loading platform 3 fixed on a vehicle body frame 2a disposed at the rear end of the vehicle body 2, and a loading platform lifting device 4 attached to the loading platform 3. The vehicle 1 is not particularly limited, and may be, for example, a loading vehicle as in this embodiment.
[0015] The loading platform 3 may include, for example, a floor 3a, a pair of side walls 3b, 3b provided on both the left and right sides of the floor 3a, and a gate 3c connected to the rear end of the floor 3a so as to be rotatable about an axis in the left-right direction D2, as in this embodiment. The loading platform 3 is open at the top in this embodiment, but is not limited to such a configuration and may be, for example, a box-like shape (specifically, a cargo box) having a ceiling and closed at the top.
[0016] The floor portion 3a has, for example, a loading platform floor surface 3d on which luggage is loaded. As a result, the space above the loading platform floor surface 3d becomes a loading space for luggage. The gate 3c may be rotatable between, for example, an open position (position shown in FIG. 1) where the gate 3c hangs downward from the floor portion 3a of the loading platform 3 and a closed position (not shown) where the gate 3c rises upward from the floor portion 3a of the loading platform 3.
[0017] The loading platform lifting device 4 is used, for example, when loading and unloading luggage from the rear of the loading platform 3 onto the loading platform floor surface 3d of the loading platform 3. The loading platform lifting device 4 may include, for example, a vertical lifting type lifting unit 5 and an attachment unit 6 for attaching the lifting unit 5 to the loading platform 3, as in this embodiment.
[0018] The lifting unit 5 may, for example, as in this embodiment, include a pair of cylindrical pillars (hereinafter also referred to as "outer columns") 7, 7 extending in the vertical direction D3, cylindrical inner columns 8, 8 extending in the vertical direction D3, inserted into the outer column 7 and moving in the vertical direction D3 relative to the outer column 7, and a cylindrical cross member 9 extending in the left-right direction D2 and connecting the pair of outer columns 7, 7.
[0019] In this embodiment, the outer column 7 has a support slit (hereinafter also referred to as an "outer slit") 7b extending in the up-down direction D3 in the rear wall 7a, and the inner column 8 has an inner slit 8b extending in the up-down direction D3 in the rear wall 8a. The outer slit 7b and the inner slit 8b communicate with each other in the front-rear direction D1 (see FIG. 10).
[0020] The lifting unit 5 may, for example, as in this embodiment, include a slider 10 that moves in the vertical direction D3 relative to the outer column 7 and the inner column 8, and a load receiving platform 11 connected to the slider 10. The slider 10 is disposed across the inside and outside of the outer column 7 and the inner column 8 by being inserted through the outer slit 7b and the inner slit 8b.
[0021] 1 and 2, the load receiving platform 11 can move in the vertical direction D3 between a lower end position (see FIG. 1) and an upper end position (see FIG. 2). At this time, the slider 10 and the load receiving platform 11 move integrally with the inner column 8 in the vertical direction D3 relative to the outer column 7, or the slider 10 and the load receiving platform 11 move in the vertical direction D3 relative to the inner column 8 and the outer column 7.
[0022] The load receiving platform 11 may include, for example, a first plate 11a rotatably connected to the slider 10, and a second plate 11b rotatably connected to the first plate 11a, as in this embodiment. As a result, as shown in Figures 1 to 3, the load receiving platform 11 is deformable between a load receiving position (see Figures 1 and 2) in which the first and second plates 11a and 11b are unfolded and move along the front-rear direction D1, and a storage position (see Figure 3) in which the first and second plates 11a and 11b are folded and move along the up-down direction D3.
[0023] The mounting unit 6 may, for example, as in this embodiment, include a base portion 12 placed on the floor portion 3a of the loading platform 3, a lock pin 13 (see Figures 7 and 8) that fixes the base portion 12 to the floor portion 3a of the loading platform 3, an inversion mechanism 14 that inverts the lifting unit 5 around an axis in the left-right direction D2, and a rotation mechanism 15 that rotates the lifting unit 5 and the base portion 12 around an axis in the up-down direction D3.
[0024] 7 and 8, the lock pin 13 may, for example, fix the base portion 12 to the floor portion 3a of the loading platform 3 by sandwiching the base portion 12 and the floor portion 3a of the loading platform 3 in the up-down direction D3 as in this embodiment. The lock pin 13 may, for example, be detachable from the base portion 12 and the floor portion 3a of the loading platform 3. This allows the base portion 12 to be switched between a fixed state in which it is fixed to the floor portion 3a of the loading platform 3 and a movable state in which it is movable relative to the floor portion 3a of the loading platform 3.
[0025] 1 to 4, for example, as in this embodiment, the reversing mechanism 14 connects the lifting unit 5 to the base part 12 so that the lifting unit 5 is rotatable with respect to the base part 12. This allows the lifting unit 5 to be reversed between a use position (see Figs. 1 to 3) in which the load receiving platform 11 is used and a non-use position (see Fig. 4) in which the load receiving platform 11 is not used, as shown in Figs. 3 and 4.
[0026] 1 to 3, when the lifting unit 5 is in the use position, a portion of the outer column 7 is disposed below the loading platform floor surface 3d. In contrast, when the lifting unit 5 is in the unused position, the entire outer column 7 is disposed above the loading platform floor surface 3d, as shown in Fig. 4. Specifically, when the lifting unit 5 is in the unused position, the entire loading platform lifting device 4 is placed on the loading platform floor surface 3d.
[0027] The up and down of the lifting unit 5 is reversed between the use position and the non-use position. The reversing mechanism 14 may, for example, reverse the lifting unit 5 by manual force (for example, by turning the handle 14a), or may, for example, reverse the lifting unit 5 by a drive source (for example, a motor).
[0028] For example, as in this embodiment, the rotation mechanism 15 is fixed to the floor 3a of the loading platform 3 and connects the base part 12 to the floor part 3a of the loading platform 3 so that the base part 12 is rotatable on the floor part 3a of the loading platform 3. This allows the lifting unit 5 to rotate between a non-use position (see FIG. 4) and a storage position (see FIG. 5), as shown in FIG. 4 and FIG. 5.
[0029] When the lifting unit 5 is in the unused position, the cross member 9 is disposed so as to extend in the left-right direction D2, and when the lifting unit 5 is in the stored position, the cross member 9 is disposed so as to extend in the front-rear direction D1. The rotation mechanism 15 may rotate the base part 12 and the lifting unit 5 by, for example, human power, or may rotate the base part 12 and the lifting unit 5 by, for example, a drive source (for example, a motor).
[0030] In this way, the lifting unit 5 can be moved to a use position (see Figs. 1 to 3), a non-use position (see Fig. 4), and a storage position (see Fig. 5). In this specification, unless otherwise specified, the front-rear direction D1 (front, rear, front, rear), the left-right direction D2 (left, right, left, right), and the up-down direction D3 (up, down, up, down) are the directions D1 to D3 when the lifting unit 5 is located at the use position.
[0031] As shown in Figures 6 to 8, the lifting unit 5 may include, for example, a rope (not shown) having a first end fixed inside the cross member 9 and a second end fixed to the upper end of the slider 10, an upper sheave 21, a lower sheave 22 and a fixed sheave 23 that are wound around the rope and fixed so that the position of the rotating shaft is immovable, a movable sheave 24 whose position of the rotating shaft moves, a drive source (e.g., an extendable cylinder) 16 that moves the movable sheave 24, and a control unit 17 that controls each part of the lifting unit 5 (e.g., the drive source 16, etc.).
[0032] As a result, the control unit 17 controls the drive source 16, and the drive source 16 moves the moving sheave 24 in the left-right direction D2, thereby moving the slider 10 in the up-down direction D3. Therefore, the slider 10 and the load receiving platform 11 move integrally with the inner column 8 in the up-down direction D3 relative to the outer column 7, or the slider 10 and the load receiving platform 11 move in the up-down direction D3 relative to the inner column 8 and the outer column 7.
[0033] The upper sheave 21 may be configured, for example, as in this embodiment, to be disposed inside and at the upper part of the outer column 7 and to be rotatable about an axis in the left-right direction D2. The lower sheave 22 may be configured, for example, as in this embodiment, to be disposed inside the outer column 7 and the cross member 9 and at the lower part of the outer column 7 and to be rotatable about an axis in the front-rear direction D1.
[0034] The fixed sheave 23 may be arranged, for example, as in this embodiment, inside the cross member 9 and be rotatable about an axis in the fore-and-aft direction D1. The movable sheave 24 may be arranged, for example, as in this embodiment, inside the cross member 9 and be rotatable about an axis in the fore-and-aft direction D1.
[0035] In addition, the lifting unit 5 may be equipped with, for example, a first guide roller 25 that guides the outer peripheral surface of the inner column 8, a second guide roller 26 that is guided by the inner peripheral surface of the outer column 7, and third guide rollers 27, 27 that are guided by the inner peripheral surface of the inner column 8, as in this embodiment.
[0036] The first guide roller 25 may be configured, for example, as in this embodiment, to be disposed inside and at the bottom of the outer column 7 and disposed outside the inner column 8. Also, the first guide roller 25 may be configured, for example, as in this embodiment, to be connected to the outer column 7 so as to be rotatable about an axis in the left-right direction D2 and fixed so that the position of the rotation axis is immovable. The first guide roller 25 guides the outer peripheral surface of the front wall 8c of the inner column 8.
[0037] The second guide roller 26 may be configured, for example, as in this embodiment, to be disposed inside the outer column 7 and connected to the upper end of the inner column 8. Also, the second guide roller 26 may be configured, for example, as in this embodiment, to be connected to the inner column 8 rotatably about an axis in the left-right direction D2, and the position of the rotation axis moves as the inner column 8 moves. The second guide roller 26 is guided by the inner circumferential surface of the rear wall 7a of the outer column 7.
[0038] The third guide rollers 27, 27 may be configured, for example, as in this embodiment, to be disposed inside the inner column 8 and connected to the slider 10. Also, the third guide rollers 27, 27 may be configured, for example, as in this embodiment, to be connected to the slider 10 rotatably about an axis in the left-right direction D2, and the position of the rotation axis may move as the slider 10 moves.
[0039] The third guide rollers 27 are guided by the inner circumferential surface of the inner column 8. Specifically, in this embodiment, the upper third guide roller 27 is guided by the inner circumferential surface of the rear wall 8a of the inner column 8, and the lower third guide roller 27 is guided by the inner circumferential surface of the front wall 8c of the inner column 8.
[0040] 9, the cross member 9 may include, for example, an upper wall 9a, a lower wall 9b, a front wall 9c, and a rear wall 9d. And, for example, as in this embodiment, the upper wall 9a, the lower wall 9b, and the front wall 9c may be connected to the outer column 7 by fixing means (for example, welding, fastening with bolts and nuts, etc.).
[0041] As a result, the cross member 9 has a connecting portion 9e that is connected to the outer column 7, and the connecting portion 9e is composed of the ends in the left-right direction D2 of the upper wall 9a, the lower wall 9b, and the front wall 9c. Therefore, the upper end 9f of the connecting portion 9e is the upper wall 9a, and the lower end 9g of the connecting portion 9e is the lower wall 9b.
[0042] The rear wall 9d may be connected to the upper wall 9a and the lower wall 9b by, for example, a fastening means of bolts and nuts. This allows the rear wall 9d to be detachable from the upper wall 9a, the lower wall 9b, and the front wall 9c. The upper wall 9a, the lower wall 9b, and the front wall 9c are fixed walls that are fixed to the outer column 7, and the rear wall 9d is a detachable wall that is attached to and detached from the fixed walls. Therefore, by detaching the detachable wall from the fixed walls, it is possible to, for example, check the interior of the cross member 9 or adjust the internal configuration of the cross member 9.
[0043] Furthermore, the upper surface of the cross member 9 (the upper surface of the upper wall 9a) may be at the same height as the upper surface of the load receiving platform 11 located at the upper end position, for example. As a result, the upper surface of the cross member 9 is used as a transition surface between the load receiving platform 11 and the load bed floor surface 3d of the load bed 3. Note that the upper surface of the cross member 9 may be at the same height as the load bed floor surface 3d of the load bed 3, for example, or may be located slightly higher than the load bed floor surface 3d of the load bed 3, for example.
[0044] The outer column 7 includes an upper column portion 7c that is disposed above an upper end 9f of the connecting portion 9e (an end portion of the upper wall 9a of the cross member 9), and a lower column portion 7d that is disposed below the upper end 9f of the connecting portion 9e. Note that, in Fig. 9(b), the configuration disposed inside the cross member 9 is not shown.
[0045] Incidentally, for example, there are cases where the load receiving platform lifting device 4 is used when the vehicle 1 is traveling on a rough road and tilted forward / backward or left / right. For example, when the load receiving platform lifting device 4 is used when the vehicle 1 is tilted left / right (when the load receiving platform lifting device 4 is used in a state in which it is tilted left / right), there is a risk that the length by which one of the inner columns 8 is inserted into the outer column 7 will be shortened.
[0046] On the other hand, the length W1 in the vertical direction D3 of the lower column portion 7d is longer than the length W2 in the vertical direction D3 of the upper column portion 7c. This makes it possible to ensure the length of the inner column 8 inserted into the outer column 7 even when the load-receiving platform lifting device 4 is used in a state inclined to the left or right.
[0047] In addition, while the length of the lower column portion 7d in the up-down direction D3 is increased, the lower end 9g of the connecting portion 9e of the cross member 9 (specifically, the end portion in the left-right direction D2 of the lower wall 9b) is disposed below the center 7e of the lower column portion 7d in the up-down direction D3. As a result, the cross member 9 supports the pair of lower column portions 7d, 7d over a wide area in the up-down direction D3, so that even when the load-receiving platform lifting device 4 is used in a state inclined left or right, the pair of lower column portions 7d, 7d can be maintained parallel to each other.
[0048] In this way, even when the load-receiving platform lifting device 4 is used in a state inclined to the left or right, the length of the inner column 8 inserted into the outer column 7 can be ensured, and moreover, the pair of lower column portions 7d, 7d can be maintained parallel. This makes it possible, for example, to prevent the inner column 8 from coming out of the outer column 7, and also makes it possible, for example, for the inner column 8 to move smoothly in the up-down direction D3 relative to the outer column 7.
[0049] Incidentally, while the length W1 of the lower column portion 7d in the up-down direction D3 is increased, the lifting unit 5 is positioned in the unused position (see FIG. 4) by the reversing mechanism 14, so that the entire outer column 7 is positioned above the bed floor surface 3d of the bed 3. Therefore, for example, while the length W1 of the lower column portion 7d in the up-down direction D3 can be increased, by positioning the lifting unit 5 in the unused position when the vehicle 1 is traveling, it is possible to prevent the outer column 7 from interfering with traveling.
[0050] However, when the loading platform 11 is elevated with a load placed on it protruding forward from the front end of the loading platform 11, there is a risk that the load may hit the cross member 9 from below. Therefore, as shown in Figs. 10 and 11, the lifting unit 5 of the loading platform lifting / lowering device 4 is provided with a safety device 30.
[0051] The safety device 30 may include, for example, a pair of rotating parts 31 spaced apart in the left-right direction D2 and each rotatably connected to the outer column 7, a safety bar 32 extending in the left-right direction D2 and connected to each of the pair of rotating parts 31, an elastic part 33 that applies an elastic restoring force to the rotating part 31, and a detection part 34 that detects that the safety bar 32 has risen to a detection position. The control part 17 also constitutes the safety device 30.
[0052] Also, for example, as in this embodiment, the detection unit 34 may be a contact sensor (limit switch) having a contactor 34a, and the rotating unit 31 may include a detected portion 31a that comes into contact with the contactor 34a in order to be detected by the detection unit 34. Note that the detection unit 34 may be any type of sensor that can directly or indirectly detect the position of the safety bar 32, such as a photoelectric sensor or a proximity sensor.
[0053] Note that the detection unit 34 may be fixed to the outer column 7 by a bracket 35 and disposed inside the cross member 9, for example, as in this embodiment. This makes it possible to easily attach the detection unit 34 to the bracket 35 and easily adjust the position of the detection unit 34, for example, by detaching the detachable wall (rear wall 9d) of the cross member 9 from the fixed walls (upper wall 9a, lower wall 9b, and front wall 9c).
[0054] Furthermore, the rotating part 31 may include, for example, a bar connecting part 31b connected to the safety bar 32, and a shaft part 31c rotatably connected to a side surface of the outer column 7. In this embodiment, the detected part 31a is disposed at a first end part of the rotating part 31, the bar connecting part 31b is disposed at a second end part of the rotating part 31, and the shaft part 31c is disposed between the detected part 31a and the bar connecting part 31b.
[0055] As a result, a first end of the rotating part 31 is disposed inside the cross member 9 (specifically, a lower end of the inside of the cross member 9), and a second end of the rotating part 31 is disposed outside the cross member 9. In the present embodiment, the rotating part 31 extends in a plate shape along the side surface of the outer column 7.
[0056] Although not particularly limited, the rotating part 31 may include, for example, as in this embodiment, a first straight part 31e having the detected part 31a and the shaft part 31c, and a second straight part 31f having the bar connection part 31b. For example, when the safety bar 32 is located at the reference position, the first straight part 31e extends at an incline downward toward the rear, and the second straight part 31f extends along the up-down direction D3.
[0057] As a result, the rotating part 31 extends in a bent manner from the first end (upper end) to the second end (lower end). However, the present invention is not limited to this configuration, and the rotating part 31 may extend downward from the first end to the second end, for example, may extend linearly from the first end to the second end.
[0058] Moreover, the elastic portion 33 applies an elastic restoring force to the safety bar 32 in a downward direction (clockwise direction in FIG. 11) by, for example, applying an elastic restoring force to the rotating portion 31. The safety device 30 is further provided with, for example, an abutment stop portion 37 that protrudes in the left-right direction D2 from the outer column 7 and abuts and stops the rotating portion 31. As a result, when no external force is applied to the safety bar 32, the elastic restoring force of the elastic portion 33 holds the rotating portion 31 at a position where it abuts and is stopped by the abutment stop portion 37.
[0059] Note that the second end of the rotating portion 31 may be disposed, for example, rearward of the abutment stop portion 37 as in this embodiment. As a result, the abutment stop portion 37 abuts and stops the rotating portion 31 in the front-rear direction D1.
[0060] Also, the abutment portion 37 may abut and stop the abutted portion 11c (see FIG. 1) of the load receiving platform 11 in the up-down direction D3, as in this embodiment. As a result, the abutment portion 37 abuts and stops the abutted portion 11c of the load receiving platform 11 at its lower end, thereby holding the load receiving platform 11 at its upper end position. In this manner, the abutment portion 37 may have the function of abutting and stopping both the rotating portion 31 and the load receiving platform 11.
[0061] For example, as in this embodiment, the elastic portion 33 may be a torsion spring 33, the rotating portion 31 may have a hole 31d for hooking a first end 33a of the inserted torsion spring 33, and the second end 33b of the torsion spring 33 may be abutted against the lower wall 9b of the cross member 9. Note that the elastic portion 33 may be any type of spring as long as it is capable of directly or indirectly applying a downward elastic restoring force to the safety bar 32, and may be, for example, a helical spring, a leaf spring, or the like.
[0062] Furthermore, the rotating part 31 may have a plurality of holes 31d, for example, as in this embodiment. In this embodiment, the rotating part 31 has three holes 31d. As a result, when the hole 31d into which the first end 33a of the torsion spring 33 is inserted is changed, the magnitude of the elastic restoring force that the elastic part 33 applies to the safety bar 32 via the rotating part 31 is changed.
[0063] Therefore, since the elastic restoring force of the elastic part 33 applied to the safety bar 32 can be changed, the elastic restoring force applied to the safety bar 32 can be adjusted as necessary. In this manner, the safety device 30 is provided with a change mechanism 36 that can change the magnitude of the elastic restoring force applied to the safety bar 32. In this embodiment, the change mechanism 36 is constituted by a plurality of holes 31d in the rotating part 31.
[0064] 11, when no external force is applied to the safety bar 32, the rotating part 31 is held at a position where it abuts against the abutment stop part 37 by the elastic restoring force of the elastic part 33, so that the safety bar 32 is located at the reference position, which is the lower end position. At this time, the contact 34a of the detection part 34 is raised, so that the detection part 34 is in the ON state.
[0065] On the other hand, when an external force is applied to the safety bar 32, for example, when a package placed on the receiving platform 11 hits the safety bar 32 from below, the safety bar 32 rises against the elastic restoring force of the elastic portion 33. This causes the detected portion 31a to descend, and the contactor 34a to descend.
[0066] 12, when the safety bar 32 rises to the detection position, the contact 34a descends to a predetermined position, and the detection unit 34 turns off. As a result, the detection unit 34 is switched from the on state to the off state, and can detect that the safety bar 32 has risen to the detection position. In this way, the detection unit 34 detects the rotation of the rotating unit 31, and can detect that the safety bar 32 has risen to the detection position.
[0067] Then, when the detection unit 34 detects that the safety bar 32 has risen to the detection position, for example, the control unit 17 may control the drive source 16 to stop the lifting of the load receiving platform 11 and then lower the load receiving platform 11 to a position below the detection position (non-detection area). As a result, after the lifting of the load receiving platform 11 is stopped, the load receiving platform 11 is lowered to a position below the detection position. Therefore, it is possible to prevent the load on the load receiving platform 11 from continuously hitting the cross member 9.
[0068] At this time, the position to which the loading platform 11 is lowered is not particularly limited as long as the safety bar 32 moves to the non-detection area. Also, for example, the position to which the loading platform 11 is lowered may be a position where the loading platform 11 contacts the ground (lower end position).
[0069] In addition, in the position of the safety bar 32, the detection position and the area above the detection position are called the detection area, and the area below the detection position is called the non-detection area, and the reference position is the lower end position of the non-detection area. In addition, when the safety bar 32 is lowered, the detected part 31a rises, and therefore the contact 34a rises.
[0070] Incidentally, at the detection position, the lower end 32a and the upper end 32b of the safety bar 32 are both lower than the lower end (specifically, the lower surface of the lower wall 9b) of the cross member 9. As a result, when the safety bar 32 rises to the detection position, the safety bar 32 itself is also located downward and away from the lower end of the cross member 9.
[0071] This makes it possible to detect at an earlier stage that the safety bar 32 has risen to the detection position. Therefore, even if there is a time lag between when the safety bar 32 rises to the detection position and when the lifting of the load receiving platform 11 stops, it is possible to prevent the load on the load receiving platform 11 from hitting the cross member 9.
[0072] Moreover, the distance W3 between the lower end 32a of the safety bar 32 located at the detection position and the lower end of the cross member 9 is greater than the distance W4 between the lower end 32a of the safety bar 32 located at the detection position and the lower end 32a of the safety bar 32 (shown by a two-dot chain line in FIG. 12) located at the reference position. As a result, the distance W3 that the safety bar 32 moves from the detection position to the lower end of the cross member 9 is greater than the distance W4 that the safety bar 32 moves from the non-detection area (reference position) to the detection area (detection position).
[0073] As a result, since the distance W4 between the lower end 32a of the safety bar 32 located at the detection position and the lower end 32a of the safety bar 32 located at the reference position is short, it is possible to detect that the safety bar 32 has risen to the detection position immediately after the luggage hits the safety bar 32 and the safety bar 32 begins to rise.
[0074] Furthermore, since the distance W3 between the lower end 32a of the safety bar 32 located at the detection position and the lower end of the cross member 9 is long, the lifting of the loading platform 11 is stopped immediately after it is detected that the safety bar 32 has risen to the detection position, thereby reliably preventing cargo on the loading platform 11 from hitting the cross member 9.
[0075] Note that, for example, as in this embodiment, the lower end 32a of the safety bar 32 located at the detection position may be disposed lower than the center P1 in the vertical direction D3 between the lower end of the cross member 9 and the lower end of the outer column 7. Returning to FIG. 11, for example, as in this embodiment, the lower end 32a of the safety bar 32 located at the reference position may be disposed lower than the center P1 in the vertical direction D3 between the lower end of the cross member 9 and the lower end of the outer column 7.
[0076] [1] As described above, the loading platform lifting / lowering device 4 in this embodiment is as follows: A pair of cylindrical support columns 7, 7 extending in the vertical direction D3; A cylindrical cross member 9 extending in the lateral direction D2 and connecting the pair of pillars 7, 7; A load receiving platform 11 that moves in the vertical direction D3 relative to the support pillar 7; A control unit 17 for controlling the movement of the loading platform 11; A safety bar 32 extending in the lateral direction D2 and connected to at least one of the cross member 9 and the pillar 7 (in this embodiment, the pillar 7) so as to be movable in the up-down direction D3 relative to the cross member 9; a detection unit 34 for detecting when the safety bar 32 has risen to a detection position, When the detection unit 34 detects that the safety bar 32 has risen to the detection position, the control unit 17 stops the lifting of the load receiving platform 11, At the detection position, the lower end 32a of the safety bar 32 is lower than the lower end of the cross member 9. This configuration is preferred.
[0077] According to this configuration, at the detection position, the lower end 32a of the safety bar 32 is lower than the lower end of the cross member 9, and when the detector 34 detects that the safety bar 32 has risen to the detection position, the lifting of the load receiving platform 11 is stopped. This makes it possible to prevent the load on the load receiving platform 11 from hitting the cross member 9.
[0078] [2] In addition, in the loading platform lifting device 4 described above in [1], as in this embodiment, At the detection position, the upper end 32b of the safety bar 32 is lower than the lower end of the cross member 9. This configuration is preferred.
[0079] According to this configuration, when the upper end 32b of the safety bar 32 is lower than the lower end of the cross member 9 at the detection position and the detector 34 detects that the safety bar 32 has risen to the detection position, the lifting of the load receiving platform 11 is stopped. This further prevents the load on the load receiving platform 11 from hitting the cross member 9.
[0080] [3] In addition, in the loading platform lifting device 4 of the above [1] or [2], as in this embodiment, an elastic portion 33 that applies an elastic restoring force to the safety bar 32 so as to position the safety bar 32 at a reference position lower than the detection position; A distance W3 between the lower end 32a of the safety bar 32 located at the detection position and the lower end of the cross member 9 is greater than a distance W4 between the lower end 32a of the safety bar 32 located at the detection position and the lower end 32a of the safety bar 32 located at the reference position. This configuration is preferred.
[0081] According to this configuration, the elastic portion 33 applies an elastic restoring force to the safety bar 32, so that the safety bar 32 to which no external force is applied is located at the reference position. Also, the distance W3 between the lower end 32a of the safety bar 32 located at the detection position and the lower end of the cross member 9 is greater than the distance W4 between the lower end 32a of the safety bar 32 located at the detection position and the lower end 32a of the safety bar 32 located at the reference position, so that it is possible to reliably prevent the baggage on the baggage receiving platform 11 from hitting the cross member 9.
[0082] [4] In addition, in any one of the load-receiving platform lifting and lowering devices 4 described above in [1] to [3], as in this embodiment, an elastic portion 33 that applies an elastic restoring force to the safety bar 32 so as to position the safety bar 32 at a reference position lower than the detection position; and a change mechanism 36 capable of changing the magnitude of the elastic restoring force applied to the safety bar 32 when the safety bar 32 is located at the reference position. This configuration is preferred.
[0083] According to this configuration, the elastic portion 33 applies an elastic restoring force to the safety bar 32, so that the safety bar 32 to which no external force is applied is located at the reference position. And, since the change mechanism 36 can change the magnitude of the elastic restoring force applied to the safety bar 32 located at the reference position, the elastic restoring force applied to the safety bar 32 can be adjusted as necessary.
[0084] [5] In addition, in any one of the load-receiving platform lifting and lowering devices 4 described above in [1] to [4], as in this embodiment, When the detection unit 34 detects that the safety bar 32 has risen to the detection position, the control unit 17 stops the lifting of the load receiving platform 11 and then lowers the load receiving platform 11. This configuration is preferred.
[0085] According to this configuration, when the detector 34 detects that the safety bar 32 has risen to the detection position, the lifting of the loading platform 11 is stopped and then the loading platform 11 is lowered. This can reliably prevent the load on the loading platform 11 from hitting the cross member 9.
[0086] [6] In addition, in any one of the load-receiving platform lifting and lowering devices 4 described above in [1] to [5], as in this embodiment, When the detection unit 34 detects that the safety bar 32 has risen to the detection position, the control unit 17 stops the lifting of the load receiving platform 11 and then lowers the load receiving platform 11 to a position below the detection position. This configuration is preferred.
[0087] According to this configuration, when the detector 34 detects that the safety bar 32 has risen to the detection position, the loading platform 11 stops rising and then descends to a position below the detection position. This makes it possible to prevent the load on the loading platform 11 from continuously hitting the cross member 9.
[0088] [7] In addition, as in this embodiment, the vehicle 1 is Any one of the load receiving platform lifting devices 4 described above in [1] to [6]; The loading platform 3 on which the loading platform lifting device 4 is attached is provided. This configuration is preferred.
[0089] With this configuration, it is possible to prevent luggage on the luggage receiving platform 11 from hitting the cross member 9.
[0090] The vehicle 1 and the loading platform lifting device 4 are not limited to the configurations of the above-mentioned embodiment, and are not limited to the above-mentioned effects. Of course, the vehicle 1 and the loading platform lifting device 4 can be modified in various ways without departing from the gist of the present invention. For example, it is of course possible to arbitrarily select one or more of the configurations and methods of the various modified examples described below and adopt them in the configurations and methods of the above-mentioned embodiment.
[0091] (A) In the load receiving platform lifting device 4 according to the above embodiment, the upper end 32b of the safety bar 32 is configured to be lower than the lower end of the cross member 9 at the detection position. However, the load receiving platform lifting device 4 is not limited to such a configuration. For example, the upper end 32b of the safety bar 32 may be configured to be higher than the lower end of the cross member 9 at the detection position. Also, for example, the upper end 32b of the safety bar 32 may be configured to be at the same height as the lower end of the cross member 9 at the detection position.
[0092] (B) In addition, in the load receiving platform lifting / lowering device 4 according to the above embodiment, the distance W3 between the lower end 32a of the safety bar 32 located at the detection position and the lower end of the cross member 9 is greater than the distance W4 between the lower end 32a of the safety bar 32 located at the detection position and the lower end 32a of the safety bar 32 located at the reference position. However, the load receiving platform lifting / lowering device 4 is not limited to this configuration.
[0093] For example, the distance W3 between the lower end 32a of the safety bar 32 located at the detection position and the lower end of the cross member 9 may be the same as the distance W4 between the lower end 32a of the safety bar 32 located at the detection position and the lower end 32a of the safety bar 32 located at the reference position. Also, for example, the distance W3 between the lower end 32a of the safety bar 32 located at the detection position and the lower end of the cross member 9 may be smaller than the distance W4 between the lower end 32a of the safety bar 32 located at the detection position and the lower end 32a of the safety bar 32 located at the reference position.
[0094] (C) In addition, in the load receiving platform lifting / lowering device 4 according to the above embodiment, the safety device 30 is provided with an elastic portion 33, and the safety bar 32 is configured to be positioned at the reference position by the elastic restoring force of the elastic portion 33. However, the load receiving platform lifting / lowering device 4 is not limited to such a configuration. For example, the safety device 30 may not be provided with the elastic portion 33, and the safety bar 32 may be configured to be positioned at the reference position by its own weight.
[0095] (D) Furthermore, in the load receiving platform lifting / lowering device 4 according to the above embodiment, when the safety bar 32 is located at the reference position, the elastic portion 33 is in an elastically deformed state and the rotating portion 31 is stopped by the abutment portion 37. However, the load receiving platform lifting / lowering device 4 is not limited to this configuration. For example, when the safety bar 32 is located at the reference position, the elastic portion 33 may be in a restored (not elastically deformed) state.
[0096] (E) In addition, in the load receiving platform lifting / lowering device 4 according to the above embodiment, the safety device 30 is configured to include a change mechanism 36 that can change the magnitude of the elastic restoring force applied to the safety bar 32 when the safety bar 32 is located at the reference position. However, the load receiving platform lifting / lowering device 4 is not limited to this configuration. For example, the safety device 30 may not include the change mechanism 36, and the magnitude of the elastic restoring force applied to the safety bar 32 when the safety bar 32 is located at the reference position may be constant (unchanged).
[0097] (F) In the load receiving platform lifting device 4 according to the above embodiment, the change mechanism 36 is configured with multiple holes 31d in the rotating part 31. However, the load receiving platform lifting device 4 is not limited to this configuration. For example, the elastic part 33 may be a helical spring having a first end connected to the rotating part 31 and a second end connected to the outer column 7 (or the cross member 9), and the change mechanism 36 may be configured to have multiple mounting parts to which the second end of the outer column 7 (or the cross member 9) can be attached.
[0098] (G) In addition, in the loading platform lifting / lowering device 4 according to the above embodiment, when the detector 34 detects that the safety bar 32 has risen to the detection position, the controller 17 stops the lifting of the loading platform 11 and then lowers the loading platform 11 to a position below the detection position. However, the loading platform lifting / lowering device 4 is not limited to this configuration.
[0099] For example, the control unit 17 may be configured to hold the loading platform 11 in the position where it stopped rising when the detection unit 34 detects that the safety bar 32 has risen to the detection position, i.e., not lower the loading platform 11 after stopping it. Also, for example, the control unit 17 may be configured to slightly lower the loading platform 11 after it stops rising when the detection unit 34 detects that the safety bar 32 has risen to the detection position, i.e., to lower it to a position above the detection position.
[0100] (H) In addition, in the load receiving platform lifting device 4 according to the above embodiment, the safety bar 32 is configured to be connected to the outer column 7 via the rotating portion 31. However, the load receiving platform lifting device 4 is not limited to this configuration. For example, the safety bar 32 may be configured to be connected to the cross member 9 via the rotating portion 31.
[0101] (I) In addition, in the load receiving platform lifting device 4 according to the above embodiment, the safety bar 32 is connected to the outer column 7 via the rotating part 31, thereby being movable in the vertical direction D3 relative to the cross member 9. However, the load receiving platform lifting device 4 is not limited to such a configuration. For example, the safety bar 32 may be connected to the outer column 7 so as to be slidable along the vertical direction D3, thereby being movable along the vertical direction D3 relative to the cross member 9.
[0102] (J) In addition, in the load receiving platform lifting device 4 according to the above embodiment, the detection unit 34 is configured to be disposed inside the cross member 9. However, the load receiving platform lifting device 4 is not limited to this configuration. For example, the detection unit 34 may be configured to be disposed outside the cross member 9 and inside the outer column 7.
[0103] (K) In addition, in the loading platform lifting / lowering device 4 according to the above embodiment, the lifting unit 5 can be moved to the use position, the non-use position, and the storage position by the reversing mechanism 14 and the rotating mechanism 15, and therefore the outer column 7 can be moved relative to the loading platform 3. However, the loading platform lifting / lowering device 4 is not limited to this configuration.
[0104] For example, the outer column 7 may be configured to be immovably fixed to the loading platform 3. Specifically, the loading platform lifting and lowering device 4 may be configured not to include the reversing mechanism 14 and the rotating mechanism 15.
[0105] Also, for example, the base portion 12 may be fixed to the loading platform 3, and the lifting unit 5 may be reversible between the use position and the non-use position. Specifically, the loading platform lifting device 4 may be provided with the reversing mechanism 14 but may not be provided with the rotating mechanism 15.
[0106] (L) Furthermore, the loading platform lifting device 4 according to the above embodiment is configured to include an inner column 8. However, the loading platform lifting device 4 is not limited to this configuration. For example, the loading platform lifting device 4 may not include the inner column 8, and the third guide roller 27 rotatably connected to the slider 10 may be guided by the inner peripheral surface of the support pillar (outer column) 7.
[0107] (M) In addition, the load-receiving platform lifting device 4 may be configured such that the safety bar 32 is located in the detection area by its own weight when the lifting unit 5 is located in the unused position. For example, in the above embodiment, the elastic restoring force of the elastic portion 33 may be set so that the safety bar 32 is located in the detection area by its own weight when the lifting unit 5 is located in the unused position.
[0108] According to this configuration, when the lifting unit 5 is in the unused position, the detector 34 detects that the safety bar 32 is in the detection area, and the controller 17 does not start moving the load receiving platform 11. Since the up and down of the lifting unit 5 is reversed between the used position and the unused position, when the lifting unit 5 is in the unused position, the detection area is the detection position and an area below the detection position.
[0109] (N) In the vehicle 1 according to the above embodiment, the loading platform lifting / lowering device 4 is configured to be directly attached to the loading platform 3. However, the loading platform lifting / lowering device 4 is not limited to this configuration. For example, the loading platform lifting / lowering device 4 may be configured to be indirectly attached to the loading platform 3 by being attached to the vehicle body 2.
[0110] (O) For example, the order of execution of each process, such as operations, procedures, steps, and stages, in the methods and apparatuses shown in the claims, specifications, and drawings, may be arbitrary, as long as the result of a previous process is not used in a subsequent process. For example, even if the description uses "first," "next," etc. for convenience, it does not mean that the processes must be executed in that order. [Explanation of symbols]
[0111] REFERENCE SIGNS LIST 1...vehicle, 2...vehicle body, 2a...vehicle frame, 3...loading platform, 3a...floor, 3b...side wall, 3c...gateway, 3d...loading platform floor, 4...loading platform lifting device, 5...lifting unit, 6...mounting unit, 7...support (outer column), 7a...rear wall, 7b...support slit (outer slit), 7c...upper column portion, 7d...lower column portion, 7e...center, 8...inner column, 8a...rear wall, 8b...inner slit, 8c...front wall, 9...cross member, 9a...upper wall, 9b...lower wall, 9c...front wall, 9d...rear wall, 9e...connecting portion, 9f...upper end, 9g...lower end, 10...slider, 11...loading platform, 11a...first plate, 11b...second plate, 11c...receiving portion, 12...base portion, 13...lock pin, 14...turning machine structure, 14a...handle, 15...rotation mechanism, 16...drive source, 17...control section, 21...upper sheave, 22...lower sheave, 23...fixed sheave, 24...movable sheave, 25...first guide roller, 26...second guide roller, 27...third guide roller, 30...safety device, 31...rotating section, 31a...detected section, 31b...bar connection section, 31c...shaft section, 31d...hole, 31e...first straight section, 31f...second straight section, 32...safety bar, 32a...lower end, 32b...upper end, 33...elastic section (torsion spring), 33a...first end, 33b...second end, 34...detection section, 34a...contact, 35...bracket, 36...change mechanism, 37...stop section, D1...fore-and-aft direction, D2...left-right direction, D3...up-and-down direction, P1...center
Claims
1. A pair of cylindrical supports extending in the vertical direction; A tubular cross member extending laterally and connecting the pair of pillars; A load receiving platform that moves vertically relative to the support pillar; A control unit for controlling the movement of the loading platform; a safety bar extending in the lateral direction and connected to at least one of the cross member and the support pillar so as to be movable in an up-down direction relative to the cross member; A detection unit that detects when the safety bar has risen to a detection position, The control unit stops the lifting of the load receiving platform when the detection unit detects that the safety bar has been lifted to a detection position, A load receiving platform lifting device, wherein, in the detection position, the lower end of the safety bar is located below the lower end of the cross member.
2. 2. The load-receiving platform lifting device according to claim 1, wherein, in the detection position, an upper end of the safety bar is lower than a lower end of the cross member.
3. an elastic portion that applies an elastic restoring force to the safety bar so as to position the safety bar at a reference position lower than the detection position; The load receiving platform lifting device of claim 1, wherein the distance between the lower end of the safety bar located at the detection position and the lower end of the cross member is greater than the distance between the lower end of the safety bar located at the detection position and the lower end of the safety bar located at the reference position.
4. an elastic portion that applies an elastic restoring force to the safety bar so as to position the safety bar at a reference position that is lower than the detection position; 2. The load-receiving platform lifting device according to claim 1, further comprising: a change mechanism capable of changing a magnitude of an elastic restoring force applied to the safety bar when the safety bar is located at the reference position.
5. 2. The loading platform lifting and lowering device according to claim 1, wherein the control unit, when the detection unit detects that the safety bar has risen to the detection position, stops the lifting of the loading platform and then lowers the loading platform.
6. 2. The loading platform lifting device according to claim 1, wherein the control unit, when the detection unit detects that the safety bar has risen to the detection position, stops the lifting of the loading platform and then lowers the loading platform to a position below the detection position.
7. A loading platform lifting device according to any one of claims 1 to 6, A vehicle comprising: a loading platform to which the loading platform lifting device is attached.
Citation Information
Patent Citations
Safety device for vehicle with cargo receiving table elevating device
JP2000071853A