JP2000318506A - Storage position determining device of cargo receiving table in cargo receiving table elevating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely position a cargo receiving table in the housing position by a simple structure, without the need for conventional reinforcing member. SOLUTION: In this cargo receiving table elevating device, a cargo receiving table 12 is provided on a deck through a link mechanism having two links of an upper link 15 and a lower link 17 so as to be freely raised and lowered, and the cargo receiving 12 is longitudinally folded so as to be housed in the floor lower surface of the deck. A stopper 31 is provided on the deck side, for regulating raising of the cargo receiving table 12 by being brought into contact with a contact part 14a provided on the lower link 17 side of the link mechanism, when the folded cargo receiving table 12 reaches the housing height position in housing the cargo receiving table 12. The stopper 31 is constituted turnably between the regulating position, in which it is brought into contact with the contact part 14a and the retracting position in which it is retreated from the regulating position. and it is so constituted as to be turnable from the retracting position to the regulating position by being interlocked with the housing initial operation in which the cargo receiving table 12 is folded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading / unloading device for raising and lowering a loading tray via a link mechanism, and more particularly to a storage height when the loading tray is folded and stored below the floor of the loading platform. TECHNICAL FIELD The present invention relates to a storage positioning device for a loading table positioned at a position.

[0002]

2. Description of the Related Art Conventionally, a loading platform is provided on a loading platform via a link mechanism having upper and lower two upper links and a lower link so as to be able to move up and down, and the loading platform is folded back and forth so as to be below the floor of the loading platform. There is provided a loading tray lifting device configured to be retractable.

[0003] When the loading tray is stored, the loading tray is folded back and forth, and then the loading tray is raised and brought into contact with the bottom of the floor of the loading tray, thereby forcibly moving the loading tray to the storage position. Had been stopped.

[0004]

However, in the prior art in which the loading tray is brought into contact with the bottom of the floor surface of the loading platform and is forcibly stopped at the storage position, the floor surface of the loading platform against which the loading platform contacts. It is necessary to reinforce the bottom, and this reinforcement complicates the structure of the floor bottom.For example, in the case of a refrigerator car, the thickness of the heat insulating material at the bottom of the floor must be reduced for the above reinforcement. Therefore, there is a problem that the refrigeration function is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing, and it is an object of the present invention to provide a lifting device capable of securely positioning a receiving position at a storage position with a simple structure without providing a reinforcing member. An object of the present invention is to provide a storage positioning device for a receiving table in a device.

[0006]

Means for Solving the Problems In order to achieve the above object, a solution taken by the invention according to claim 1 is a load receiving platform via a link mechanism having two upper and lower links and a lower link on a loading platform. Is provided so as to be able to move up and down, and the loading tray is folded back and forth so that it can be stored below the floor of the loading platform. When storing the loading tray, the folded loading tray is stored. When reaching the height position, a stopper is provided on the loading platform side to contact the contact portion provided on the lower link side of the link mechanism, and the stopper is provided on the loading platform side. A position and a retracted position retracted from the restriction position, and configured to rotate from the retracted position to the restricted position in conjunction with an initial storage operation of folding the load receiving table. A.

Further, a solution taken by the invention according to claim 2 is characterized in that the stopper according to the invention according to claim 1 is specified. Specifically, the stopper is rotated from the regulation position to the retracted position in conjunction with the initial operation of deploying the load receiving bed from the storage state to the use state below the floor of the loading platform.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment> FIG. 1 shows a schematic structure of a loading / unloading device.

[0010] The loading tray lifting device 10 is provided, for example, at the rear end of the loading platform 2 placed on the vehicle frame 1 of the vehicle. The mounting frame 11a, the mounting member 11b, etc. are provided below the rear edge of the vehicle frame 1. A parallel link mechanism is provided symmetrically on a mounting bracket 11 fixedly provided via a link, and a driving device for driving these parallel link mechanisms is provided. A load receiving table 12 pivotally supported by the parallel link mechanism is connected to the loading platform 2. The loading tray 12 is configured to move up and down with respect to the ground and to tilt when the loading tray 12 reaches the ground, and to be stored below the floor of the loading tray 2 in a state where the loading tray 12 is folded into two. Is configured.
Hereinafter, the details will be described.

A drive shaft 13 is horizontally supported by the mounting bracket 11, and rotating plates 14 are fixed to both ends of the drive shaft 13, respectively.

A base end of an upper link 15 is rotatably supported on the mounting bracket 11 by a pin 16, and a base end of a lower link 17 is rotatable by a pin 18 on the turning plate 14. It is supported by.

The tip of the upper link 15 is rotatably supported on the upper end of a mounting arm 19 by a pin 19a.

The distal end of the lower link 17 is rotatably supported at the lower end of the mounting arm 19 by a pin 19b.

The driving device includes a lifting cylinder 20
Is provided on the mounting bracket 11, and the rod end of the elevating cylinder 20 is connected to the drive shaft 13 via a rotating arm 21.

On the other hand, the turning plate 14 is provided with a contact bolt 23 which comes into contact with the lower surface of the lower link 17 and transmits the turning motion of the turning plate 14 to the lower link 17.

A contact portion 15a is formed near the base end of the upper link 15. This contact portion 15a
Is for contacting the bolt 25 provided on the mounting bracket 11 when the loading tray 12 reaches the highest position where the loading tray 12 is substantially flush with the floor surface of the loading tray 2, and restricts the lifting of the loading tray 12. It is.

The bolt 25 is screwed into the upper part of the mounting bracket 11 in a substantially horizontal state such that the tip thereof comes into contact with the contact part 15a. Therefore, by adjusting the screw-in amount of the bolt 25 and changing the protrusion amount of the tip of the bolt 25, the position where the contact portion 15a abuts on the tip of the bolt 25 can be adjusted. The positioning of the position can be adjusted.

That is, the above-described parallel link mechanism is mainly composed of the upper link 15, the lower link 17, and the mounting arm 19, and the parallel link mechanism and each of the members associated therewith serve to mount the left and right mounting brackets 11. It is disposed in a pair on the left and right.

The loading table 12 has its base end attached to the pins 19a of the left and right mounting arms 19 by the bracket 1.
Each is rotatably supported via 2a. As shown in FIG. 6, the loading table 12 has approximately one half of the base end 12.
1 and a half portion 122 on the tip end side are rotatably supported via a hinge 123, and are configured to be able to be folded in two.

Also, as shown in FIG.
When the loading table 12 is unfolded horizontally, it is held in a horizontal state by appropriate horizontal holding means 22.

Here, on the vehicle body frame 1 side, as shown in FIGS. 2 and 3, a loading tray 12 constituting a main part of the present invention.
Storage positioning device 30 is provided. Note that FIG.
In addition, in FIG. 3, a link mechanism and the like for moving the load receiving table 12 up and down are omitted.

The storage positioning device 30 is provided with
Is folded back and forth and stored below the floor of the loading platform 2 to restrict the rise of the loading platform 12 when it reaches the storage position.

Specifically, a stopper 31 provided on the mounting bracket 11 so as to be vertically swingable,
And an interlocking mechanism 32 that operates the stopper 31 in conjunction with the initial operation of the storage.

As shown in FIG. 4, the stopper 31 has a proximal end 312 pivotally supported by a pivot pin 313 and a stopper body 311;
And a bolt 314 screwed into the distal end of the cradle 314. By adjusting the amount of screwing of the bolt 314, it is possible to adjust a positioning position of the loading tray 12 described later when the storage tray 12 is stored.

As shown in FIGS. 2 to 4, the interlocking mechanism 32 includes a swinging link 33 integrally provided at a base end of the stopper 31 and an interlocking link having a tip connected to the swinging link 33. A link 34 and an operating link 35 whose base end is pivotally supported at the distal end of a support frame 1a protruding rearward on the vehicle frame 1 side.
And a connecting rod 36 connected between the operating link 35 and the pivot 34a of the interlocking link 34.

The base end of the interlocking link 34 is pivotally supported at both ends of a pivot shaft 34a pivotally supported between the above-mentioned left and right mounting brackets 11, 11, and an intermediate portion of the pivot shaft 34a. One end 36a of the connecting rod 36 is pivotally supported by a connecting arm 37 provided integrally with the connecting rod 37.

The interlocking link 34 and the swing link 33 have a pin 34a provided at the tip of the interlocking link 34 slidably fitted in a long hole 33a formed at the tip of the swing link 33. The connection structure is made.

The mounting relationship between these members is shown in FIG.
As shown in FIG. 5, when the operating link 35 is standing substantially vertically at the tip of the support frame 1a, the stopper 31
Is disposed at a regulating position where the horizontal axis is substantially horizontal, and in a state where the operating link 35 is rotated so as to protrude rearward from the tip of the support frame 1a as shown by a dashed line, the stopper 31 swings upward. It is arranged at a retreat position (see a dashed line) for retreating from the restriction position.

Further, on the mounting bracket 11 side, there is provided a blocking member 38 which abuts against the tip of the swing link 33 to prevent the swing of the stopper 31 when the stopper 31 swings to the regulating position. I have.

The stopper 31, constructed as described above,
The swing link 33, the interlocking link 34, and the blocking member 38 are arranged as a pair on the left and right. In other words, left and right interlocking links 3
4 are integrally provided at both ends of the pivot shaft 34a, and the above-mentioned members are provided for the interlocking link 34 as described above. This allows the left and right stoppers 31
Are arranged at the restricting position and the retracted position while synchronizing through the interlocking link 34 and the swing link 33 with the rotation of the pivot shaft 34a.

Further, the stopper 31 is configured to be held at the restricting position and the retracted position by the urging force of the spring 39. Specifically, the spring 39 is
One end of the bracket 3 is attached to the base end 312 of one stopper 31 (the stopper 31 arranged on the upper side in FIG. 3).
9a, and the other end is fixed to the mounting frame 11a.

As a result, the axis of the spring 39 exceeds the center of the pivot pin 313, which is the center of rotation of the stopper 31, in either the upper or lower direction. The stopper 31 is held at the restricting position or the retracted position.

The left and right stoppers 31 configured as described above
The rotating plate 14 which controls the up and down movement of the left and right lower links 17
The contact part 14a provided on the upper part of the
2 is brought into contact at the end of storage.

Further, the interlocking mechanism 32 configured as described above is provided with an operation member 40 for forcibly disposing the stopper 31 disposed at the restriction position to the retracted position. As shown in FIGS. 2 and 3, the operation member 40 has a base end integrally provided at one end of the pivot shaft 34 a and an end of a wire member 41 fixed to the end.

The other end 41a of the wire member 41 is formed in an annular shape, and is arranged to be guided to the rear of the vehicle frame 1 through an intermediate portion 41b.

Therefore, in a state where the stopper 31 is located at the regulating position, the other end 41a of the wire member 41 is pulled backward, whereby the operating member 40 is forcibly rotated backward, and By the rotation, the stopper 31 is rotated from the regulation position to the retreat position through the pivot shaft 34a, the interlocking link 34, and the swing link 33.

At the tip of the support frame 1a, a pair of left and right two support rollers 50 and 51 are provided. The support rollers 50 and 51 support the load receiving table 12 when the load receiving table 12 is stored, and perform the storing operation smoothly.

Next, the operation of the loading stand lifting / lowering device configured as described above will be described. First, when loading and unloading cargo between the loading platform 2 and the ground, the loading tray 12 which is folded and stored as shown in FIG.
After being lowered to the ground due to the degeneration of
Expand to a horizontal state.

Then, the operator operates the other end 4 of the wire member 41.
By pulling 1a backward and forcibly rotating the operation member 40 backward, the stopper 31 is disposed at the retracted position shown by the two-dot chain line in FIG.

By moving the lifting cylinder 20 up and down in this state, the above-mentioned parallel link mechanism operates up and down.
The vertical movement of the parallel link mechanism causes the loading table 12 to move up and down.

During the elevating operation, when the loading tray 12 is moved up and down while keeping the horizontal state from just before the ground to the height of the floor of the loading tray 2, the loading tray 12 reaches the ground. In FIG. 1, the tip of the receiving tray 12 is tilted by a tilting mechanism (not shown) so as to contact the ground (see a two-dot chain line in FIG. 1).

When the loading tray 12 is raised to the highest position, which is substantially flush with the floor of the loading platform 2, the upper link 1 is attached to the tip of the bolt 25 provided on the mounting bracket 11.
The contact portion 15a formed on the contact member 5 comes into contact with the contact portion 15, whereby the lifting of the load receiving table 12 is stopped.

Next, after the unloading of the package is completed, the
In the case where is stored, by rotating the front end side approximately half 122 of the loading table 12 arranged on the ground forward, it is disposed on the base end side approximately half 121 and folded in two. The folded receiving table 12 is raised up until it comes into contact with a lower supporting roller 51 provided on the supporting frame 1a as shown in FIG. As a result, the operation link 35 also comes into contact with the load receiving table 12 and protrudes rearward from the state in which it is rotated forward and substantially stands up.

In conjunction with the rotation of the operating link 35 (the operation at the time of initial storage), the left and right interlocking links 34 and the swing link 33 rotate through the connecting rod 36, the connecting arm 37, and the pivot shaft 34a. . By this rotation, the left and right stoppers 31 rotate from the retracted position toward the regulating position against the urging force of the spring 39, and when the axis of the spring 39 exceeds the center of the pivot pin 313, the spring 39
Acts to rotate the stopper 31 to the regulation position side, and the stopper 31 is arranged at the regulation position and that state is maintained.

Thereafter, the loading cylinder 12 is raised by extending the lifting / lowering cylinder 20, so that the loading platform 12 in the upright state is gradually tilted forward while being supported by the lower supporting roller 51, and then rises. When the loading table 12 reaches the storage position while being supported by the upper supporting roller 50, FIG.
As shown in FIG.
Abut on the tip. As a result, the lift of the receiving tray 12 is forcibly restricted, and the receiving tray 12 can be arranged at the storage position.

When the loading tray 12 is moved up and down between the loading platform 2 and the ground, the operation of disposing the stopper 31 from the regulation position to the retreat position is performed by the operator manually operating the wire member 41 as described above. The operation is not limited to being performed by pulling the other end 41a, but may be performed using an appropriate actuator.

<Second Embodiment> Next, a second embodiment of the present invention will be described.
Will be described with reference to FIGS. 8 and 9. FIG.

In this embodiment, the structure of the interlocking mechanism is changed. The configuration other than the interlocking mechanism is the same as that of the first embodiment, and the same portions are denoted by the same reference numerals and description thereof will be omitted.

That is, in the present embodiment, as shown in FIG. 8, the interlocking mechanism 6 includes a swing link 33 integrally provided at the base end of the stopper 31 and a long hole at the tip of the swing link 33. An interlocking link 34 in which a pin 34a at the distal end is slidably fitted within 33a, an operating link 61 pivotally supported at a substantially central portion by the distal end of the support frame 1a on the vehicle frame 1, and an interlocking link with the operating link 61. And a connecting rod 36 connected between the pivot shaft 34a and the pivot shaft 34a. In this case, the operating link 61 includes an upper protruding piece 61a projecting obliquely upward from a pivot portion with respect to the support frame 1a, and a lower projecting piece 61b projecting obliquely downward from the pivot portion.

FIG. 9 shows the mounting relationship of these members.
As shown in FIG. 3, the operation link 61 is formed such that the lower projecting piece 61b of the operation link 61 projects rearward from the tip of the support frame 1a.
In the forwardly inclined state (the state shown by the solid line in FIGS. 8 and 9), the stopper 31 is positioned at the restricting position where the stopper 31 is substantially horizontal (the position shown by the solid line in FIG. 8). In a standing state in which the stopper 31 pivots rearward and rises substantially vertically (a state shown by a dashed line in FIGS. 8 and 9), the stopper 31 swings upward and retracts from the regulation position (one point in FIG. 8). (A position shown by a chain line). The interlocking mechanism 6 is disposed as a pair on the left and right.

The operation link 61 (the upper projecting piece 61a and the lower projecting piece 61b) is guided by the support rollers 50 and 51 when the folded loading table 12 is stored.
8 and is rotated forward (see FIG. 8).
And in FIG. 9, it is turned counterclockwise) to be converted into a forward tilted state, and in conjunction with the operation of converting the operation link 61 to the forward tilted state, via the connecting rod 36, the connecting arm, and the link 34. The stopper 31 is positioned at the regulating position. On the other hand, the operating link 61 abuts on the distal end side approximately half 122 of the load receiving table 12 when the folded load receiving table 12 is deployed from the storage state to the use state in which it can be moved up and down (FIG. 8 and FIG. 8). (Rotating clockwise in FIG. 9)
Then, in conjunction with the operation of converting the operation link 61 to the upright state, the stopper 31 is positioned at the retracted position via the connecting rod 36, the connecting arm, and the interlocking link 34.

Next, the operation of the lifting / lowering device configured as described above will be described. First, when loading and unloading cargo between the loading platform 2 and the ground, the loading platform 12 is in the folded storage state, so that the loading platform 12 is deployed to a useable state in which it can be raised and lowered, and the lifting cylinder 20 is retracted. Let it. At this time, when the loading tray 12 is guided by the upper supporting roller 50 and then by the lower supporting roller 51, the lower protruding piece 61b of the operating link 61 which is in a forwardly inclined state has about a half 122 on the distal end side.
And the operating link 61 is rotated rearward to convert it into an upright state (a state shown by a chain line in FIGS. 8 and 9).
Thereby, the stopper 31 is moved to the retracted position (FIGS. 8 and 9) via the connecting rod 36, the connecting arm, and the interlocking link 34, which are interlocked with the operation of converting the operation link 61 to the upright state.
(A position indicated by a dashed-dotted line).

Then, after the lifting cylinder 20 is retracted as it is to lower the load receiving table 12 to the ground, the load receiving table 12 is developed and brought into a horizontal state.

Then, the parallel link mechanism operates up and down by extending and retracting the lifting cylinder 20, and the vertical movement of the parallel link mechanism causes the loading tray 12 to move up and down.

On the other hand, when the unloading of the package is completed,
Is stored, the front end side half 122 of the loading tray 12 deployed on the ground is rotated forward to overlap the base half side 121, and the loading tray 12 is folded in two. . In this state, the folded loading tray 12 (about half of the tip side 122) is raised up until it comes into contact with the lower supporting roller 51. At this time, the upper projecting piece 61a of the operation link 61
Abuts on the loading tray 12 and turns the operating link 61 forward to convert to a forward tilted state (a state shown by a solid line in FIGS. 8 and 9). Thereby, the stopper 31 is positioned at the regulation position (the position indicated by the solid line in FIGS. 8 and 9) via the connecting rod 36, the connecting arm, and the interlocking link 34 interlocked with the operation of converting the operation link 61 to the forward tilt state.

Thereafter, the load receiving table 12 is raised by extending the lifting / lowering cylinder 20, so that the load receiving table 12 in the upright state is gradually tilted forward while being supported by the lower supporting roller 51, and then rises. When the load receiving table 12 reaches the storage position while being supported by the upper support roller 50, the contact portion 14 a of the rotating plate 14 contacts the tip of the stopper 31. As a result, the rise of the loading tray 12 is forcibly regulated,
The receiving table 12 can be arranged at the storage position.

[0058]

As described above, according to the loading / unloading device of the first aspect of the present invention, the stopper is moved from the retracted position in conjunction with the initial storage operation of folding the loading device. By rotating to the regulation position, when the folded receiving tray reaches the storage height position, the stopper comes into contact with the contact part provided on the lower link side of the link mechanism to restrict the lifting of the loading tray. Such a reinforcing member is not required, and the receiving table can be reliably positioned at the storage position with a simple configuration.

According to the storage positioning device for the loading tray in the loading tray elevating device according to the second aspect of the present invention, the stopper is rotated from the regulation position to the retracted position in conjunction with the initial operation of deploying the loading tray. Therefore, the stopper can be automatically converted into both the restriction position and the retreat position in accordance with the operation of the load receiving table.

[Brief description of the drawings]

FIG. 1 is a side view showing a schematic configuration of a loading tray elevating device according to a first embodiment.

FIG. 2 is a side view showing a configuration of a storage positioning device of the loading tray in the loading tray elevating device.

FIG. 3 is a plan view showing a configuration of a storage positioning device of the loading tray in the loading tray elevating device.

FIG. 4 is a side view showing the configuration of a stopper and a part of an interlocking mechanism connected to the stopper.

5 is a view taken in the direction of the arrow A in FIG. 3, showing a specific arrangement of a spring for holding the stopper at the restricting position and the retracted position.

FIG. 6 is a side view showing an initial storage state of the same loading tray.

FIG. 7 is a side view showing a state where the same loading tray is stored.

FIG. 8 is a side view showing a configuration of a storage and positioning device for a receiving table according to a second embodiment.

FIG. 9 is an enlarged side view of the operation link.

[Description of Signs] 1 Car frame 2 Loading platform 10 Loading platform lifting device 12 Loading platform 14 Rotating plate 14a Contact portion 15 Upper link 17 Lower link 30 Storage positioning device 31 Stopper 32 Interlocking mechanism 6 Storage positioning device

Claims (2)

[Claims] A load receiving platform is provided on a loading platform via a link mechanism having two upper and lower upper links and a lower link so as to be able to move up and down, and the loading platform is folded back and forth so as to be retractable. In the elevating device, when storing the load receiving table, when the folded load receiving table reaches a storage height position, the folded load receiving table comes into contact with a contact portion provided on a lower link side of the link mechanism, thereby restricting the lifting of the load receiving table. A stopper is provided on the loading platform side, and the stopper is configured to be rotatable between a restricting position where the contact portion abuts and a retracted position retracted from the restricting position. A storage position of the receiving table in the receiving table elevating device, which is configured to be rotated from the retreat position to the restriction position in conjunction with the operation of (1). 2. The stopper according to claim 1, wherein the stopper is pivoted from a regulation position to a retracted position in conjunction with an initial operation of deploying the loading tray from a stored state to a used state below the floor of the loading platform. The storage positioning device for a loading tray in the loading tray lifting device according to claim 1.