JP3601433B2 - Vehicle lift table - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle lift table that is stored in a horizontal state under the floor of a packing box when not in use, and is slid to the rear side of the packing box during lifting and lowering.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, trucks and the like have been provided with a lift table that can be lifted and lowered at the rear of the cargo bed in order to simplify the cargo handling operation. 2. Description of the Related Art A cargo handling device for a lorry has been proposed in which a foldable table is pivotally supported by the device, and a lift table is raised and lowered horizontally by a link device that is rotated by a hydraulic cylinder during a loading operation.
[0003]
However, when not in use, the lift table is folded in half and stored compactly under the floor of the loading platform and stored in a compact state. Therefore, it is necessary to extend or fold the table during loading and unloading work. It was a heavy effort because it was a task.
[0004]
Japanese Patent Application Laid-Open No. H8-230547 discloses an elevating member that moves up and down along columns provided on both sides of a rear part of a packing box, and guides a platform (lift table) under the floor of the elevating member and the packing box. The platform is slid along the guide rails to store the non-use lift table under the floor, and the platform pulled out of the packing box is connected to the wire between the rear end of the lifting table and the packing box. A freight vehicle platform configured to be supported by ropes has been proposed. According to this platform, the platform can be slid and stored compactly under the floor, and when not in use, there is no need to fold the lift table in two, making it easy and easy to deploy and store the platform. Although it is possible, there is a problem that the workability when loading / unloading the luggage on the platform is poor. In other words, the wire rope is obliquely hung on both sides of the platform so as to connect the platform pulled out of the packing box and the packing box. I can't. In order to solve such a problem, for example, it is conceivable to support the lower surface of the platform with a support arm or the like. In this way, when the lower surface of the platform is supported by the support arm, when the platform is grounded, Of the platform and the ground due to the support arm disposed on the lower surface of the vehicle. Therefore, in order to eliminate such a step between the platform and the ground, this type of platform is usually provided with a rotatable auxiliary plate at the rear end of the platform. They are stored so as to be superimposed on each other, and are arranged in an inclined manner in order to eliminate a step with the ground by rotating backward during cargo handling work. However, as described above, when trying to support the lower surface of the platform with the support arm, the step between the platform and the ground is increased by the amount of the support arm, so an auxiliary plate for eliminating the step between the ground and the platform is inevitable. It becomes bulky and heavy. For this reason, in order to make the cargo handling work more efficient, a structure that can minimize the step between the platform and the ground contact surface is desired.
[0005]
The present invention is intended to solve such a problem. When the lift table is pulled out rearward, the lower surface thereof can be stably supported by a support arm, and a step generated by the support arm can be minimized. It is an object of the present invention to provide a vehicular lift table that can be effectively eliminated.
[0006]
[Means for Solving the Problems]
The vehicle lift table of the present invention is a guide column provided on both sides of the rear end of the packing box, an elevating member that moves up and down along the guide column, and slides forward and backward along a guide rail provided on the elevating member, A lifting table that is pulled out of the cargo box during loading and unloading and is stored under the floor when not in use; and an elevating drive unit that is positioned within the guide post and suspends the elevating member, A pivotable support member that engages with the lift table is pivotally mounted, and biasing means for biasing the support member in an upright direction is provided. The member is configured to be sunk into the back surface side of the lift table, and the tip of the lift table is interposed between the lifting drive unit and the lifting member when the lifting member is grounded. It is provided with a tilt mechanism for grounding.
[0007]
With the above configuration, when loading or unloading luggage, the lift table stored under the floor is pulled backward. Thus, the lift table stored under the floor is pulled out along the guide rail of the elevating member. At this time, the support arm in the upright state is pushed out against the urging means and pivots outward in conjunction with the sliding movement of the lift table, and the support arm sinks into the lower surface of the lift table. Accordingly, the lift table is supported by the support arm, and the fulcrum distance from the elevating member can be extended by the support arm, so that the lift table can be stably supported. In this way, the lift table is raised and lowered by the lifting drive means with the lift table pulled out to the rear of the packing box. Then, when the elevating member supporting the lift table comes into contact with the ground during the elevating operation, the lift table is tilted by the tilt mechanism so that the tip of the lift table comes into contact with the ground. Thereby, the step between the lift table and the ground contact surface can be minimized.
[0008]
At the time of lifting and lowering of the lift table, when the lifting member moves away from the ground surface, the lift table returns to horizontal by the tilt mechanism, and moves up and down while maintaining the horizontal state. Then, when storing the lift table under the floor, the lift table is stopped at the "storage height" and the lift table is pushed out, so that the lift table moves smoothly under the floor of the packing box along the support arm. . Along with this, the end of the lift table is disengaged from the support arm, the support arm is erected by the urging means, and the rearward movement of the lift table is regulated by the returned support arm.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. 1 to 7 show an embodiment of the present invention. In the drawings, reference numeral 1 denotes a cargo box mounted on the rear of a truck mounted on a body frame 2, and 3 is stored under the floor of the box box 1. A pair of left and right guide columns 4 and 4 for guiding the lift table 3 up and down are provided on both sides of the rear end of the packing box 1. The guide posts 4, 4 are each formed in the shape of a hollow rectangular tube, and elevating members 5, 5 for raising and lowering the lift table 3 are arranged inside the guide posts 4, 4 so as to be vertically movable.
[0010]
As shown in FIG. 4, the lifting members 5 and 5 are formed in a T-shaped cross section in which a reinforcing plate 7 is integrally fixed to a front portion of a flat lifting plate 6, and the lifting member 5 is slightly below the lifting plate 6. A pair of left and right rotating rollers 8 that rotate along the inner surface of the guide column 4 are pivotally supported, and a grounding roller 9 that contacts the grounding surface G is pivotally supported at the lower end of the lifting plate 6. At the lower ends of the reinforcing plates 7, 7, mounting plates 10, 10 are respectively fixed so as to protrude forward, and guide rails for slidably guiding the lift table 3 to the inner surfaces of the mounting plates 10, 10 respectively. 11 and 11 are fixed so as to face each other. A receiving frame 15 is provided below the guide rails 11 for attaching a support arm 13 as a support member of the lift table 3. The receiving frame 15 is composed of a pair of left and right receiving plates 16, 16 and a horizontal plate 17 laid over the upper ends of the receiving plates 16, 16. The support arm 13 is disposed between the pair of left and right receiving plates 16, 16. It is arranged and pivotally attached by a pivot shaft 18 so that it can be raised and lowered. Further, a coil spring 19 as an urging means is provided on the pivot shaft 18 of the support arm 13, and the coil spring 19 constantly urges the support arm 13 in the upright direction. The support arm 13 rotationally urged by the coil spring 19 abuts against the horizontal plate 17 and is held upright. As described above, the horizontal plate 17 functions as a stopper of the support arm 13 and is fixed to face the guide rail 11 to guide the lift table 3 between the horizontal plate 17 and the guide rail 11. The horizontal plate 17 is also used as a part of the guide rail 11. A rotating roller 14 is pivotally supported on the tip side of the support arm 13. When the lift table 3 is pulled out behind the packing box 1, the lift table 3 slides on the rotating roller 14.
[0011]
The lift table 3 thus pulled out to the rear of the packing box 2 is moved up and down between the ground surface G and a height substantially flush with the floor surface of the packing box 1 by the lifting member 5, and At a position slightly lower than the surface 1A (hereinafter referred to as a storage height), the storage case 1 is stored under the floor of the packing box 1 in a horizontal state along a slide rail 22 formed on the body frame 2. A guide roller 23 that supports the lift table 3 facing the opening of the packing box 1 is pivotally attached to the slide rail 22 located at the lower portion. The lift table 3 that slides inside the slide rail 22 is guided by the guide roller 23. It is possible to slide smoothly.
[0012]
The lift table 3 is configured by fixing a top plate 26 to the upper surface of a substantially rectangular frame 25, and a pair of left and right guide rollers 27 is rotatably supported at the left and right ends of the front end of the lift table 3. Have been. A handle 28 for pulling out the lift table 3 is fixed to the center of the rear end of the lift table 3, and the lift table 3 is attached to the rear end of the lift table 3 when the lift table 3 is lowered to the ground surface G. An auxiliary plate 30 for eliminating a step between the ground plane G and the ground plane G is pivotably connected to the auxiliary plate 30.
[0013]
As shown in FIG. 7, a lifting drive means 35 for raising and lowering the lifting member 5 includes a hydraulic cylinder 37 disposed in a hollow rectangular cylindrical post 36 extending over the lower end of the guide support 4, and a hydraulic cylinder 37. The movable pulley 38 attached to the piston rod 37A, the fixed pulleys 39 and 40 attached to both ends of the post 36, and these movable pulleys 38 and the fixed pulleys 39 and 40 are mounted to suspend the lifting members 5 and 5, respectively. And a pair of left and right wire cables 41, 41. The moving pulley 38 fixed to the hydraulic cylinder 37 has two sets of guide grooves 38A so that the two wire cables 41, 41 can be hooked. Then, one ends of the wire cables 41, 41 are fixed to a fixing plate 42 provided in the post 36, and the wire cables 41, 41 are respectively wrapped around the guide grooves 38A of the moving pulley 38 and fixed at both ends of the post 36. Each of the pulleys 39 and 40 is wrapped around, and further, is wrapped around a fixed pulley 44 pivotally supported at the upper end of each of the guide posts 4 to guide the other ends of the wire cables 41 and 41 into the inside of each of the guide posts 4. In the support column 4, the other ends of the wire cables 41, 41 are connected to the lifting members 5, 5, respectively. Thus, the lift table 3 is moved up and down via the elevating members 5 and 5 by the expansion and contraction operation of the hydraulic cylinder 37.
[0014]
Reference numeral 50 denotes a tilt mechanism for lowering the tip of the lift table 3 to eliminate a step between the lift table 3 and the ground when the lifting member 5 is in contact with the ground. As shown in FIG. 6, the tilt mechanism 50 includes a substantially triangular link plate 51, and a hanging tool 52 is pivotally attached to one end of the link plate 51 by a pin 53, and the other end of the link plate 51 is pinned. 54 pivotally attaches to the lifting plate 6. A guide roller 55 that rotates along the inner surface of the guide column 4 is supported at the outer end of the link plate 51. In addition, a pulley 56 for connecting with the wire cables 41, 41 is pivotally attached to the hanging tool 52.
[0015]
In the present embodiment configured as described above, the operation of pulling out and storing the lift table 3 is performed at the “storage height” during the lifting stroke of the lifting member 5. That is, when pulling out the lift table 3 backward for loading and unloading the luggage, the user grips the handle 28 of the lift table 3 stored under the floor and pulls out the body frame 2 backward. As a result, the lift table 3 in the slide rail 22 is pulled out along the guide rail 11 of the elevating member 5 and slides behind the packing box 1. At this time, as shown in FIG. 5, the support arm 13 erected by the coil spring 19 is pushed out against the coil spring 19 and pivots outward in conjunction with the sliding movement of the lift table 3, and the support arm 13 is moved outward. Dive into the lower surface of the lift table 3. As a result, the lift table 3 is supported by the support arm 13, so that the subsequent lift table 3 can be smoothly pulled out along the rotating roller 14 that is pivotally supported by the tip of the support arm 13. Then, when the lift table 3 is pulled out to the end position, the guide roller 27 pivotally supported at the end of the lift table 3 abuts against a stopper (not shown) formed on the guide rail 11 and the guide rail 11 and the horizontal plate 17 Held in between. Thereby, the lift table 3 pulled out to the rear of the packing box 1 has the front end portion of the lift table 3 with the left and right guide rollers 27 held by the guide rail 11 and the horizontal plate 17 and the rear end of the packing table 1. The lower surface of the lift table 3 that has been pulled out is stably supported by the rotating rollers 14 that are pivotally supported at the tips of the left and right support arms 13. In this manner, by extending the piston rod 37A of the hydraulic cylinder 37 with the lift table 3 pulled out to the rear of the packing box 1, the two wire ropes 41 are sent out and the lift suspended from the wire rope 41 is lifted. Table 3 descends. At this time, since a vertical load is applied to the link plate 51 suspended from the wire rope 41 by the weight of the lifting member 5 and the lift table 3, the link plate 51 rotates counterclockwise S as shown in FIG. Force acts. As a result, the guide roller 55 pivotally connected to the link plate 51 and the rotating roller 8 pivotally connected to the elevating plate 6 abut against the inner surface of the guide column 4, and the elevating plate 6 is supported at two points by the guide roller 55 and the rotating roller 8. Is done. In this state, the lifting plate 6 is substantially vertical, and moves up and down while maintaining this state. Then, when the grounding roller 9 pivotally attached to the lower end of the lifting plate 6 comes into contact with the ground, the vertical load of the lifting plate 6 is not applied to the link plate 51, but the tip of the lift table 3 rises from the grounding surface G. Therefore, if the wire rope 41 is further loosened while the grounding roller 9 is in contact with the ground, a rotational force in the clockwise direction S1 acts on the link plate 51 due to the weight of the lift table 3, whereby the lifting plate 6 The upper end of the rotary roller 8 that abuts against the inner surface of the guide column 4 is inclined forward, and the tip of the lift table 3 is grounded. Thereby, the step between the lift table 3 and the ground plane G can be made as small as possible. Thereafter, the auxiliary plate 30 pivotally attached to the rear end of the lift table 3 is pivoted rearward to eliminate the step between the lift table 3 and the ground plane G. That is, since the tip of the lift table 3 is tilted and a step is generated between the lift table 3 and the contact surface G due to the thickness of the lift table 3, the pivot is finally pivoted to the rear end of the lift table 3. The auxiliary plate 30 to be worn is rotated rearward. However, since the auxiliary plate 30 eliminates a step corresponding to the thickness of the lift table 3, it is small and lightweight, and its rotating operation is easy. After the lift table 3 is grounded and the load is loaded on the lift table 3, the two wire ropes 41 are pulled by the hydraulic cylinder 37, so that the link plate 51 first rotates clockwise S, and the link Since the lift plate 6 rotates substantially vertically following the rotation of the plate 51 and the lift table 3 returns to the horizontal state, the load on the lift table 3 becomes unstable when the lift table 3 moves up and down. Not even. Then, the lift table 3 is stopped in a state where the load box 1 is also raised to the same height as the floor surface 1A, and the load on the lift table 3 is loaded into the load box 1 or loaded in the load box 1. On the lift table 3. After the completion of the cargo handling operation, the unused lift table 3 is stored under the floor.
[0016]
When the lift table 3 is stored under the floor, the lift table 3 is stopped at the “storage height”, and the lift table 3 is pushed out. And smoothly move under the floor of the packing box 1 along. Accordingly, the guide roller 27 pivotally attached to the rear end of the lift table 3 is guided along the slide rail 22 formed on the inner surface of the vehicle body frame 2, and the lift table 3 is finally stored under the floor. When the end of the lift table 3 comes off from the support arm 13, the support arm 13 stands up by the coil spring 19 and is held against the horizontal plate 17. At this time, the rear end of the lift table 3 is locked by the support arm 13 returned by the coil spring 19, and the rearward movement of the lift table 3 is restricted. A guide member 60 and a step / bumper 61 slidably provided in the guide member 60 are provided below the floor of the packing box 1. When the lift table 3 is stored under the floor, the guide box 60 is attached to the packing box 1. When going in and out, the bumper 61 is pulled out to the rear of the packing box 1 so that the bumper 61 is stored in the guide member 60 except during the cargo handling operation.
[0017]
As described above, according to the embodiment of the present invention, when pulling out the lift table 3 to the rear side of the packing box 1, the lower surface of the lift table 3 is pivoted by the pair of left and right support arms 13 pivotally attached to the lower end of the lifting member 5. Can be supported very stably when the lift table 3 is taken in and out. Further, the support arm 13 is always urged in the rising direction by the coil spring 19, and by pulling out the lift table 3 against the coil spring 19, the lift arm 3 is moved in conjunction with the moving operation to support the lift arm 3. Goes under the lift table 3. Conversely, if the lift table 3 is pushed out, the support arm 13 is erected by the coil spring 19, so that it is not necessary to operate the support arm 13 at the time of cargo handling work, and it is sufficient to simply move the lift table 3 in the front-rear direction.
[0018]
Further, since the lift table 3 is supported by the support arm 13 at a position protruding rearward of the vehicle, the fulcrum distance from the elevating member 5 can be increased by the support arm 13, so that the lift table 3 is stably supported. be able to. When the lifting plate 6 is grounded, the tip of the lift table 3 may be tilted so that the tip of the lift table 3 is grounded with the rotation of the link plate 51 interposed between the wire rope 41 and the lifting plate 6. it can. That is, when the lift table 3 is pulled out to the rear of the packing box 1, the lower surface of the lift table 3 supports the support arm 13, so that the step between the lift table 3 and the ground plane G becomes large due to the support arm 13. The step between the lift table 3 and the ground plane G can be minimized by the link plate 51 interposed between the wire rope 41 and the lifting plate 6. Although the auxiliary plate 30 pivotally attached to the rear end of the lift table 3 is finally rotated to eliminate the step between the lift table 3 and the ground plane G, the link plate 51 allows the lift table 3 to be lifted. The height difference between the auxiliary plate 30 and the ground plane G can be made as small as possible, so that the auxiliary plate 30 can be reduced in size and weight, the rotation operation of the auxiliary plate 30 is easy, and the auxiliary plate 30 is easy to handle. Become.
[0019]
Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. For example, although an example in which the lift table is suspended by a wire cable as means for raising and lowering the lift table has been described, an appropriate selection may be made, such as by directly suspending the lift table by a pair of left and right hydraulic cylinders.
[0020]
【The invention's effect】
According to the vehicle lift table of the present invention, the guide posts provided on both sides of the rear end of the packing box, the elevating members that move up and down along the guide posts, and slide back and forth along the guide rails provided on the elevating members And, during loading and unloading, while pulling out the rear of the packing box, the lift table is stored under the floor when not in use, and lifting and lowering driving means for suspending the lifting member located in the guide support, and A pivotable support member engaging with the lift table is pivotally attached to the guide rail, and biasing means for biasing the support member in the upright direction is provided, and when pulling out the lift table to the rear of the packing box, The support member is sunk into the back side of the lift table, and the lift table is interposed between the lifting drive means and the lift member when the lift member is grounded. Since the tilt mechanism that grounds the tip is provided, the lower surface of the lift table can be supported by the support arm when pulling out the lift table to the rear side of the packing box, so that the lift table is stably supported. Can be. Further, when the lift table is grounded, the tip of the lift table is tilted by the tilt mechanism, and the tip of the lift table can be grounded, so that the step between the lift table and the ground contact surface can be minimized.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a lift table according to an embodiment of the present invention, showing a grounded state.
FIG. 2 is a cross-sectional view of the lift table showing a storage state of the lift table.
FIG. 3 is a cross-sectional view showing a connection state between the lift table and a lifting drive unit.
FIG. 4 is a front view showing the elevating member.
FIG. 5 is a sectional view showing an operation of the support arm.
FIG. 6 is an enlarged sectional view showing the tilt mechanism according to the first embodiment;
FIG. 7 is a sectional view showing the lifting / lowering driving means.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Packing box 3 Lift table 4 Guide column 5 Elevating member 11 Guide rail 13 Support arm (support member)
19 coil spring (biasing means)
35 Elevating drive means 50 Tilt mechanism

Claims (1)

A guide column provided on both sides of the rear end of the packing box, an elevating member that moves up and down along the guiding column, and slides in the front-rear direction along a guide rail provided on the elevating member. A lift table which is pulled out and stored under the floor when not in use, and an elevating drive means for suspending the elevating member which is located in the guide support column, and the up / down engagement of the guide rail with the lift table A flexible support member is pivotally mounted, and biasing means for biasing the support member in the upright direction is provided, and when pulling out the lift table to the rear of the packing box, the support member is sunk into the back side of the lift table. And a tilt mechanism interposed between the lifting / lowering drive means and the lifting / lowering member to ground the tip of the lift table when the lifting / lowering member is grounded. Lifting tables for a vehicle according to claim.

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