JP2996138B2 - Vehicle lifter device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column fixed to the end of a cargo bed of a vehicle and serving as a lifting guide, and a member for raising and lowering the platform. The present invention relates to a vehicle lifter device having a post to be mounted.

[0002]

2. Description of the Related Art FIG. 4 shows an overall perspective view of a related-art vehicle lifter device. In the following description, the width direction of the vehicle lifter device will be referred to as the X-axis direction, the front-rear direction will be referred to as the Y-axis direction, and the height direction will be referred to as the Z-axis direction. This lifter device 1 is a lifter mounted on the rear part of a bed 2 of a truck, and has a pair of columns 6 at both ends of a rear beam 3 of the bed 2 (one side is omitted in the figure). The column 6 is formed of a steel material into a U-shaped cross section, and is mounted at right angles to the rear beam 3. As shown in FIG. 3, a pipe-shaped holder 6p is fixed to the inner wall surface of the column 6 on both sides in the upper part and on one side in the lower part, and the holder 6p is formed of a cylindrical resin. A certain guide member 6j is housed and fixed in a state where the tip portion protrudes. Further, as shown in FIG. 4, a pair of upper rollers 6r is mounted on an upper guide member 6j on the inner wall surface of the column 6, and a pair of lower rollers 6t is mounted below the lower guide member 6j. Have been.

[0003] A post 7 which moves up and down following the column 6 is engaged with the column 6. The post 7 is a member provided with a groove 7m and a bulge 7k formed on both sides in a vertical direction, and a pulley 7p for hooking a wire between the groove 7m and the groove 7m is provided on an upper portion thereof with an axis parallel to the X axis. It is mounted so that it can rotate around. Further, a retaining block 7b for retaining a wire at a position facing the lower outer surface of the bulging portion 7k of each post 7 is provided.
Has been fixed. And, this retaining block 7b
, That is, a wire is connected to a corner position of the post 7 (see FIG. 3).

[0004] As shown in FIG.
Since the groove 7m is sandwiched between the guide members 6j of the column 6 from both sides, the movement in the width direction (X-axis direction) is restricted.
The movement in the front-rear direction (Y-axis direction) is restricted by storing the r and the lower roller 6t. The post 7 can be moved up and down along the column 6 with the movement in the X-axis and Y-axis directions restricted.

[0005] As shown in FIG. 4, a hydraulic cylinder 5 is mounted on the rear beam 3 of the loading platform 2, and a first pulley 3 a and a second pulley, on both sides of the hydraulic cylinder 5, are provided with wires. 3b. And one end was connected to the hydraulic cylinder 5
In the state where the No. 1 wire 5a is hung on the first pulley 3a, the tip A of the retaining block 7b of one post 7
It is connected to the. One end of the hydraulic cylinder 5
No. 2 wire 5b connected to the first pulley 3a,
The other post 7 is connected to the tip A of the retaining block 7b while being hooked on the second pulley 3b.

Further, the post 7 has platform guides 4 provided on both sides of the loading platform 4.
j (one side is omitted in the figure) can be engaged so as to be able to move up and down freely. The platform guide 4j
Is a T-shaped member having a flat cross section. A pair of upper rollers 4r are mounted on both upper sides thereof, and a pair of lower rollers 4t are mounted on both lower sides thereof. The portions of the upper roller 4r, the lower roller 4t, and the platform guide 4j parallel to the Y axis are accommodated inside the bulging portion 7k of the post 7. Further, one end of a No. 3 wire 4c is connected to the upper center of the platform guide 4j, and the other end is connected to the lower center of the column 6 while the No. 3 wire 4c is hung on the pulley 7p of the post 7. It is connected to the provided detent block 6x. The other platform guide 4j (not shown) is housed in the post 7 with the same structure.

With such a structure, when the hydraulic cylinder 5 is driven in a direction to extend the piston rod,
The No. 1 wire 5a and the No. 2 wire 5b are pulled upward through the first pulley 3a and the second pulley 3b, and the posts 7 follow the column 6 and rise. When the posts 7 are raised, the pulley 7p mounted on the upper portions of the posts 7 is raised, so that the No. 3 wire 4c hung on the pulleys 7p is pulled up, and the platform guide 4j and the platform 4 are raised. As described above, the platform guide 4j has a two-stage suspension structure to secure a lift and to reduce the size of the lifter device.

[0008]

However, according to the conventional vehicle lifter device 1 described above, as shown in FIGS. 3 and 4, the post 7 is connected to the No. 1 wire 5a or the No. 2 wire 5b. Retaining block 7
The tip A of b is suspended. That is, the post 7 is structured to be hung at a corner position. Therefore, eccentricity from the load center is inevitable, and an eccentric load is applied to the post 7 in a direction in which the post 7 is inclined when the post 7 is lifted. Accordingly, the holder 6p and the guide member 6j of the column 6 supporting the post 7 against the eccentric load.
Must be made firmly. For this reason, there is a problem that the cost required for the mechanism for supporting the post 7, that is, the holder 6p, the guide member 6j, and the like increases. Further, since the resistance when the post 7 rises following the column 6 increases, there is also a problem that the wear of the guide member 6j is accelerated and replacement is frequent.

Further, the column 6 needs to firmly fix the holder 6p to the inner wall surface thereof.
Since j needs to be replaced frequently, a steel material formed into a U-shaped cross section with one side open is preferably used. However, a steel material having a U-shaped cross section has lower strength than a cylindrical body or the like in which the steel material has a closed cross section. For this reason, in order to secure the specified strength, a thick steel material must be used, and there is a problem that the weight of the column 6 increases. The present invention
In order to solve the above problem, the eccentricity from the center of load when hanging the post is minimized to simplify the mechanism for supporting the post from the lateral direction. An attempt is made to reduce the weight of the device by improving the structure.

[0010]

The above object is achieved by a vehicle lifter having the following components. That is, the vehicle lifter device according to claim 1 includes a column fixed to the end of the cargo bed of the vehicle and serving as an elevating guide, and a member for elevating the platform, and following the column in a state of being suspended by a wire. A lifter device for a vehicle including a post that moves up and down, wherein the column is formed in a cylindrical shape, and the post has a structure in which a central portion in a width direction is suspended by the wire and moves up and down in the column. The column and the post are held by a backlash preventing member so that their side surfaces do not contact each other.

[0011]

According to the present invention, since the column is formed in a cylindrical shape, its strength is higher than that of a conventional U-shaped cross section. For this reason, the thickness of the material required to secure the specified strength can be made smaller than before, and the weight can be reduced. Further, since the post has a structure in which the center in the width direction is hung by the wire, eccentricity from the center of load when the post is hung can be minimized. For this reason, the eccentric load applied in the direction in which the post is tilted when the post is lifted is reduced, and the mechanism for supporting the post in the horizontal direction can be simplified, such as rattling. Further, since the post has a structure that moves up and down in the column, the movable portion does not go outside and the safety is improved. Also, since the column and the post are held by the backlash preventing member so that the sides do not contact each other,
The play when the post moves up and down following the column is reduced, and the lifting operation is performed smoothly.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle lifter according to an embodiment of the present invention will be described below with reference to FIGS. In the following description, the width direction of the vehicle lifter device will be referred to as the X-axis direction, the front-rear direction will be referred to as the Y-axis direction, and the height direction will be referred to as the Z-axis direction. The lifter device 10 according to the present embodiment is a lifter mounted on a rear portion of a truck bed, and includes a rear beam 13 of the truck bed.
Are provided with a pair of columns 16 at both ends. Column 1
Numeral 6 denotes an elevating guide formed in the shape of a rectangular tube, which is mounted at right angles to the rear beam 13. An opening 16h is formed on a side surface of each of the columns 16 at a portion connected to the rear beam 13, and a first portion is formed at this position.
A pulley 13a and a second pulley 13b are mounted.

Further, a disc-shaped guide member 16j is attached to a lower portion of the column 16 on inner wall surfaces on both sides in the X-axis direction. The guide member 16j is a play preventing member for preventing the inner wall surface of the column 16 from contacting the outer surface of the post 17 described later, and is formed of resin and has two projections on the back surface. Then, the guide members 16j are fixed to the column 16 by press-fitting the two projections into the mounting holes 16k of the column 16. A retaining block 16x for retaining the wire is fixed to the inside of the lower part of the front wall of the column 16, and a slit-shaped notch 1 is provided on the rear wall from the center position to the lower end.
6s are formed.

Each of the columns 16 has its column 16
The post 17 which moves up and down in accordance with the above is stored (one post is omitted in the figure). The post 17 is a member formed in a substantially rectangular cylindrical shape, and an opening groove 17s is formed in the rear wall surface in the central longitudinal direction. The post 1
7 is provided with a protruding portion 17t protruding forward, and a pulley 1 for hanging a wire on the protruding portion 17t.
7p is mounted so as to be rotatable about an axis parallel to the X axis. A post 1 is located behind the pulley 17p.
An upper roller 17r is mounted so as to prevent the rear wall 7 from coming into contact with the inner wall of the column 16. Further, disc-shaped guide members 17j are attached to both sides in the X-axis direction below the upper roller 17r. The guide member 17j is a rattling member for preventing the outer surface of the post 17 from contacting the inner wall surface of the column 16, and is formed of resin and has two projections on the back surface. Then, the guide members 17j are fixed to the posts 17 by press-fitting the two projections into the mounting holes 17h of the posts 17.

Further, a retaining block 17b for retaining the wire is fixed to the front wall surface of the post 17 at the center of the lower end in the width direction, and the distal end A of the retaining block 17b is connected to the wire. Has become. As shown in FIG. 2, the post 17 is sandwiched on both sides by guide members 16j and the like to restrict the movement in the width direction (X-axis direction). 16 so as not to contact the inner wall surface. In this state, the post 17 can move up and down following the column 16. The projection 17t and the pulley 17p provided above the post 17 are always arranged above the first pulley 13a and the second pulley 13b provided in the opening 16h of the column 16.

As shown in FIG. 1, a hydraulic cylinder 15 is mounted on the rear beam 13 of the carrier.
No. is assigned to the piston rod 15p of the hydraulic cylinder 15.
The ends of the first wire 15a and the No. 2 wire 15b are connected. Here, the hydraulic cylinder 15 is connected to a hydraulic device (not shown) so that the piston rod 15p can be extended to a predetermined position by a driver's operation. The No. 1 wire 15a is hooked on the first pulley 13a and its tip is connected to the tip end A of the retaining block 17b of one post 17, and the No. 2 wire 15b is connected to the first pulley 13a.
The other post 17 (not shown) is connected to the leading end portion A of the retaining block 17b (not shown) while being hung on the second pulley 13b.

The post 17 has platform guides 14j provided on both sides of the loading platform 14.
Are stored so as to be able to move up and down freely. The platform guide 14j is a thin plate-shaped member positioned parallel to the Y axis, and has a pair of upper rollers 14r mounted on both upper sides thereof, and a pair of lower rollers 14t mounted on both lower sides thereof. And the upper roller 14r is the post 1
7 and the lower roller 14t contacts the front wall side of the post 17, and furthermore, the platform guide 14j
Is partially projected from the opening groove 17s of the post 17, so that the platform guide 14j is
The post 17 can be moved up and down in a state where the movement in the axial direction is restricted. In addition, platform guide 14
One end of a No. 3 wire 14c is connected to the upper part of j, and the other end is connected to a retaining block 16x of the column 16 while the No. 3 wire 14c is hung on a pulley 17p of a post 17. . The other platform guide 14j has a similar structure and is housed in a post 17 (not shown).

That is, in the vehicle lifter device 10 according to the present embodiment, the post 17 moves up and down inside the column 16, and further, the inside of the post 17
The lifting and lowering is performed in two stages such as the lifting and lowering of 4j. Here, the opening groove 1 of the post 17
A portion of the platform guide 14j protruding from 7s moves along the notch 16s of the column 16 when the post 17 moves up and down inside the column 16. Therefore, the platform guide 14j does not interfere with the post 17.

Next, the vehicle lifter device 1 according to the present embodiment.
The operation of 0 will be described. First, when the platform 14 is raised, the hydraulic cylinder 15 is
Driven in the direction extending p. As a result, No. 1
The wire 15a and the No. 2 wire 15b are pulled up by the same size via the first pulley 13a and the second pulley 13b. No. 1 wire 15a and No. 1
When the two wires 15b are pulled up, both posts 17 rise inside the respective columns 16. Here, since the post 17 is structured to be suspended by the No. 1 wire 15a or the No. 2 wire 15b at the position A of the retaining block 17b fixed at the center in the width direction, the post 17 is suspended from the load center when the post 17 is suspended. Eccentricity can be reduced. Therefore, the eccentric load when the post 17 is lifted is reduced, and a mechanism for supporting the post 17 from the horizontal direction, that is, the guide members 16j, 17j, the upper roller 17r, and the like are rattled, and a simple structure that prevents metal touch is provided. can do.

When the posts 17 rise inside the column 16, the pulleys 17 mounted on these posts 17
Since p rises, the N applied to both pulleys 17p
o. The three wires 14c are pulled up. As a result, the platform guide 14j connected to one end of the No. 3 wire 14c rises inside the post 17,
The platforms 14 supported by those platform guides 14j are raised. That is, the hydraulic cylinder 15
The post 17 rises inside the column 16 by the action of the No. 1 wire 15a and the No. 2 wire 15b, and the pulley 17p
And the post 17 by the action of the No. 3 wire 14c.
And the platform guide 14j rises inside, so that the double head of the hydraulic cylinder 15 can be secured and the size of the device can be reduced.

When the platform 14 descends,
The hydraulic pressure from the hydraulic device is no longer applied to the hydraulic cylinder 15, and the platform 14, the platform guide 14j and the post 17 are naturally lowered by their own weight and the load of the load. As described above, according to the vehicle lifter device according to the present embodiment, since the eccentric load when the post 17 is lifted can be reduced, a mechanism that supports the post 17 from the horizontal direction can be a simple mechanism such as rattling. Therefore, cost can be reduced. Also, almost no maintenance is required. Therefore, the column 1
There is no problem even if 6 is formed into a rectangular cylindrical shape, and the strength can be improved as compared with a conventional steel material having a U-shaped cross section. Therefore, the thickness of the steel material required to secure the specified strength can be made smaller than before, and the weight can be reduced.
Further, since the post 17 has a structure that moves up and down in the column 16, the movable portion does not go outside and the safety is improved.

Further, since the post 17 is suspended at the center in the width direction, the distance between the first pulley 13a and the second pulley 13b becomes wider than in the prior art, and
Hydraulic cylinder 1 mounted between 3a and 13b
5 can be increased. This makes it possible to increase the lift of the lifter device.

[0023]

According to the present invention, since the column is formed in a cylindrical shape, the strength is increased and the weight can be reduced. Further, an eccentric load applied in a direction in which the post is inclined when the post is lifted is reduced, and a mechanism for supporting the post in a horizontal direction can be simplified.
In addition, the post does not get out of the column, which improves safety. Also, the play when the post moves up and down following the column is reduced, and the up and down operation is performed smoothly.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a vehicle lifter device according to one embodiment of the present invention.

FIG. 2 is a plan sectional view showing a state in which a post is stored in a column.

FIG. 3 is a plan sectional view showing a state in which a conventional column and a post are engaged.

FIG. 4 is an overall perspective view of a conventional vehicle lifter device.

[Explanation of symbols]

 14 Platform 14j Platform Guide 14c No. 3 Wire 15 Hydraulic Cylinder 15a No. 1 Wire 15b No. 2 Wire 16 Column 17 Post

Claims (1)

(57) [Claims] 1. A vehicle comprising: a column fixed to an end of a bed of a vehicle and serving as an elevating guide; and a post serving as a member for elevating and lowering the platform, the post being lifted and lowered following the column while being suspended on a wire. In the lifter device for use, the column is formed in a cylindrical shape, and the post has a central portion in the width direction formed by the wire.
And the column and the post are lifted up and down in the column.
A lifter device for a vehicle, wherein the lifter device is held so that surfaces do not contact each other .