JPH09240352A - Load table opening or closing auxiliary device in load table lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of some irregular surfaces caused by a recovering force of a torsion bar from being generated in a load table lifting device and at the same time to keep the load table in a horizontal balanced state by the torsion bar when the load table is held at a horizontal state. SOLUTION: A torsion bar 21 is installed inside an inserting part 15 placed at the base part of a load table 8. One end of the torsion bar 21 is inserted into the other end of one fixed shaft 16 in such a way that it may not be rotated. A supporting member 22 having a hollow part 23 into which a part of the torsion bar 21 is installed is fixed to the other end of the torsion bar 21 in such a way that a recovering force is generated when the load table 8 is turned in a downward direction from its vertical state to horizontal state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading platform elevating device for loading and unloading a loading platform by raising and lowering the loading platform.
In particular, the present invention relates to a loading tray opening / closing assisting device that allows the loading tray to be stored upright.

[0002]

2. Description of the Related Art Generally, after a loading and unloading operation is completed, an elevating and lowering device for a load receiving tray is constructed so that the load receiving tray is manually rotated upward to be stored upright. Human power was needed. Therefore, in the past, the actual public
As disclosed in Japanese Patent Application Laid-Open No. 4-10645, a pair of left and right mounting columns are provided on a loading platform so as to be able to move up and down, and the loading platform can be vertically rotated on the mounting columns via a pair of left and right fixed shafts provided at the base of the loading platform. I am trying.

One end of the torsion bar is attached to one of the mounting columns, and the other end of the torsion bar is attached to a block-shaped support member fixed to the base of the load carrier. When the load carrier is erected and stored, the torsion bar is in an unloaded state. As a result, the storage work can be performed with a little labor when the load receiving tray is rotated upward.

[0004]

In the structure described above, however, since the support member is block-shaped, the contact surface of the support member which is in contact with the base of the load receiving base is small, and the load receiving base is made of aluminum. When the torsion bar is twisted, if the torsion bar is twisted, the restoring force of the support member pushes the contact surface with the load receiving base, and the small contact surface causes the force per unit area acting on the load receiving base. Is large, and there is a problem in that unevenness occurs on the loading tray. To solve this problem, if the block is made larger, the force per unit area of the contact surface can be made smaller, but the twisting distance of the torsion bar becomes shorter, and the restoring force when the load receiving platform is in the horizontal state is reduced. Since the weight of the cargo receiving tray becomes larger than its own weight, a new problem arises in that the cargo receiving tray cannot be balanced in a horizontal state when the cargo receiving tray is horizontal.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to prevent unevenness from occurring in the cargo receiving table and to balance the cargo receiving table in a horizontal state.

[0006]

In order to achieve the above-mentioned object, the present invention mounts a loading platform on a vehicle body, provides a pair of left and right mounting members on the vehicle body or the loading platform, and the mounting member is provided with an elevating member. A pair of left and right mounting struts is provided so as to be able to move up and down, and one end of a pair of left and right fixed shafts is fixed to the pair of left and right mounting struts respectively, and the load receiving tray is placed in a horizontal state and a vertical state via the pair of left and right fixed shafts. In a load receiving platform elevating device provided on a mounting column so as to be vertically rotatable, a torsion bar is internally provided in an insertion part of the load receiving base, and one end of the torsion bar is non-rotatably inserted into the other end of one fixed shaft. At the other end of the torsion bar, a supporting member having a hollow part in which a part of the torsion bar is installed is fixed so that a restoring force is generated when the load receiving table is rotated downward from a vertical state to a horizontal state. Characterized by There.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the accompanying drawings. In FIG. 1, reference numeral 1 denotes a vehicle body of a freight vehicle having a luggage carrier 2, and a pipe-shaped support pipe 3 extending in the left-right direction is fixed to the rear end of the vehicle body 1. A pair of left and right mounting members 4 is fixed to the left and right ends of the support pipe 3, respectively.

The mounting member 4 has a flat plate shape and a substantially triangular shape, and the support pipe 3 is fixed to one corner. 5,
Reference numeral 6 is an upper / lower link which is an elevating member arranged in parallel in the vertical direction. The bases of both links 5 and 6 are located at the other end of the mounting member 4, that is, in front of one corner (left side in FIG. 1). Is pivotally supported in the corner of.

At the ends of the links 5 and 6, mounting posts 7 each having an L-shaped cross section and having a vertical shape are axially supported, and the parallel links G are formed by the links 5, 6 and the mounting members 4 and the mounting posts 7.
Is formed. At the lower part of the mounting column 7, a load receiving base 8 is provided so as to be vertically rotatable. Reference numeral 9 is a refraction link provided between the mounting column 7 and the load receiving base 8. When the bending link 9 is extended, the load receiving base 8 can be held in a horizontal state as shown by a solid line, and when folded, as shown by a dot-dash line, It is designed to be stored upright at the end.

Reference numeral 10 is a cylinder for vertically rotating the upper link 6 via a pair of arms 11. When the cylinder 10 extends, both links 5, 6 vertically rotate, and the load receiving base 8 moves up and down. It is like this. The load receiving base 8 is composed of an aluminum main body 12 and an iron frame 14 fixed to both ends of the main body 12 with rivets 13, and an insert portion 15 having a rectangular cross section is provided at the base of the main body 12. Has been formed.

Reference numeral 16 denotes a pair of left and right fixed shafts having a circular cross section. The fixed shaft 16 is composed of a small diameter portion 17 and a large diameter portion 18,
The large-diameter portion 18 is installed inside the insertion portion 15 of the main body 12 of the cargo receiving base 8, and the small-diameter portion 17 penetrates the frame 14 of the cargo receiving base 8 and the boss 19 serving as a spacer to lower the mounting column 7. The load receiving base 8 is vertically rotatable around the fixed shaft 16.

Next, an opening / closing assisting device for the cargo receiving tray 8 will be described with reference to FIGS. The large diameter portion 18 of the fixed shaft 16 on the one side (the left side in FIG. 3) is provided with a hole 20 having a square cross section, and one end of a torsion bar 21 having a square cross section is non-rotatably inserted into the hole 20. There is. Reference numeral 22 is a support member that is non-rotatably inserted into the insertion portion 15 of the base portion of the main body 12 of the load receiving table 8.

The support member 22 has a quadrangular shape with a rectangular cross section having substantially the same shape as the insertion portion 15. One side (left side in FIG. 3) of the support member 22 is not larger than the outer diameter of the torsion bar 21 and restrains the rotation of the torsion bar 21. A hollow portion 23 is bored, a hole 24 having the same outer diameter as the torsion bar 21 is bored on the other side, and the other end of the torsion bar 21 is inserted into the hole 24 penetrating the hollow portion 23 and supported. The dimension L of the torsion bar 21 that is welded to the end portion of the member 22 (on the right side in FIG. 3) and twisted is larger than the protrusion amount L ′ from the support member 22 in the hollow portion 2.
It is longer by 3.

At this time, the torsion bar 21 is set so as to be unloaded at the standing storage position of the load receiving base 8 (the position indicated by the alternate long and short dash line in FIG. 1), and the torsion bar 21 when the load receiving base 8 is horizontal. The restorative force is set to be equal to or less than the own weight of the cargo receiving table 8 and can be balanced in a horizontal state when the cargo receiving table 8 is horizontal. 25 is the hole 2 of the large diameter portion 18 of the fixed shaft 16 on the other side
The rod member 25 is welded to the rod 6, and the rod member 25 prevents the torsion bar 21 from sliding rightward in FIG. 2 together with the support member 22.

Next, FIG. 7 shows another embodiment.
A pair of left and right mounting members 27 are fixed to the rear end of the loading platform 26, and a slider 29 as an elevating member is provided on the mounting member 27 via a post 28 so as to be vertically slidable. A mounting column 30 is provided below the slider 29, and a load receiving base 31 is vertically rotatable on the mounting column 30. FIG. 8 shows the loading platform opening / closing device of FIG. 7. The difference from FIG. 3 is that the mounting column 30 is plate-shaped and the hinge plate 32 is fixed to the frame 14 instead of the boss 19. It is a point.

By the way, in the present embodiment of FIG. 1, the load receiving table is vertically rotatable below the mounting column, but it may be vertically rotatable near the shaft supporting portion of the upper link to the mounting column. The operation of the present invention having the above-mentioned construction will be described below. When loading and unloading cargo, the loading platform 8 shown in FIG.
When the load receiving base 8 is rotated clockwise from the state of the one-dot chain line stored upright and becomes horizontal as shown by the solid line, the bending link 9 is extended and the load receiving base 8 is kept horizontal. To do.

At this time, the rotation shaft 16 side of the torsion bar 21 is not rotated due to the downward rotation of the load receiving base 8 because the fixed shaft 16 is fixed to the mounting column 7, and the support member 22 side is the support member. Since 22 is non-rotatably inserted in the insertion portion 15 of the main body portion 12 of the cargo receiving stand 8, the torsion bar 21 is gradually twisted because the torsion bar 21 is gradually twisted together with the cargo receiving stand 8, so that the cargo receiving stand 8 suddenly moves. The downward rotation is prevented, and when the load receiving platform 8 is horizontal, it is balanced in a horizontal state.

Next, when loading cargo on the ground onto the cargo platform 2 with the cargo carrier 8 in the horizontal state, the cylinder 10 is contracted and the parallel link mechanism G is rotated downward to lower the cargo carrier 8 to the ground. . After the lowering of the loading platform 8, the cargo on the ground is loaded into the loading platform 8.
Then, the cylinder 10 is extended, the parallel link mechanism G is rotated upward, and the load receiving base 8 is raised to the maximum.

At the most raised position of the cargo carrier 8, the cargo carrier 8 is substantially flush with the cargo carrier 2, so the load on the cargo carrier 8 is slid and placed on the cargo carrier 2. When unloading the luggage on the loading platform 2, the luggage can be unloaded by performing the reverse operation to the above. Next, when the load receiving base 8 is stored upright, the parallel link mechanism G is rotated upward to raise the load receiving base 8 to the maximum. From this state, the load receiving table 8 is rotated upward and stored upright as shown by the alternate long and short dash line. At that time, since the torsion bar 21 is in a twisted state, the torsion bar 2 is attached to the load receiving base 8.
The restoring force of 1 acts, and the load receiving platform 8 can be rotated upward with a little labor.

The restoring force of the torsion bar 21 pushes the contact surface between the support member 22 and the main body 12 of the aluminum load carrier 8 made of a weak material, but the support member 22 has a hollow portion 23.
Since the contact surface is made larger by forming the ridge, the unevenness does not occur in the main body portion 12 of the load receiving base 8. If the main body portion 12 of the load receiving base 8 is made of strong iron, the plate thickness is reduced. There is no unevenness.

Further, since the support member 22 is provided with the hollow portion 23, the twisted portion of the torsion bar 21 becomes longer, and when the load receiving platform 8 is horizontal, it is balanced in a horizontal state.

[0022]

As described above, according to the present invention, the torsion bar is internally provided in the insertion portion of the load receiving base, and one end of the torsion bar is non-rotatably inserted into the other end of one fixed shaft.
At the other end of the torsion bar, a supporting member having a hollow portion in which a part of the torsion bar is installed is fixed so that a restoring force is generated when the load receiving table is rotated downward from a vertical state to a horizontal state. The contact surface between the load receiving base and the load receiving base becomes larger by the amount of the hollow portion, so that the restoring force of the torsion bar does not cause unevenness in the load receiving base.

Further, the twisted portion of the torsion bar is lengthened by the hollow portion, and the restoring force of the torsion bar becomes too strong so that the horizontal state of the load receiving platform does not rotate upward and is balanced in the horizontal state. .

[Brief description of drawings]

FIG. 1 is an overall view of a loading platform lifting device equipped with the device of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view taken along the line CC of FIG. 3;

5 is a DD diagram of FIG. 3. FIG.

FIG. 6 is an EE diagram of FIG. 3;

FIG. 7 is an overall view of a loading platform raising / lowering device according to another embodiment.

8 is an FF diagram of FIG. 7. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 vehicle body 2 loading platform 4 mounting member 7 mounting column 8 loading platform 15 insertion section 16 fixed shaft 21 torsion bar 22 support member 23 hollow section

Claims (1)

[Claims] 1. A loading platform is mounted on a vehicle body, and a pair of left and right mounting members are provided on the vehicle body or the loading platform, and a pair of left and right mounting columns is provided on the mounting member so as to be able to move up and down.
One end of each of the pair of left and right fixed shafts is fixed to the pair of left and right mounting columns, and the load receiving platform is provided on the mounting column so as to be vertically rotatable through the pair of left and right fixed shafts in a horizontal state and a vertical state. In the platform elevating device, a torsion bar is internally provided in the insertion part of the load receiving base, one end of the torsion bar is non-rotatably inserted into the other end of one fixed shaft, and the other end of the torsion bar is provided. A loading tray opening / closing assisting device in a loading tray lifting device in which a supporting member having a hollow portion in which a part of a torsion bar is installed is fixed so that a restoring force is generated when the loading tray rotates downward from a vertical state to a horizontal state. .