JP2001347877A - Work positioning device for housed type load receiving table elevating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work positioning device for a housed type load receiving table elevating device, easily operated with good workability and capable of positively positioning a load receiving table in an elevating work position on the way of sliding. SOLUTION: In the housed type load receiving table elevating device, the load receiving table 5 is provided at a deck 1 elevatingly through a link mechanism 4 having two upper and lower links 41, 42, and the load receiving table' 5 is slid and housed in a longitudinally folded state in a housed position below the deck 2. The load receiving table 5 is constituted to be arrangeable in an expanded-folded position of being pulled out to the rear of the deck 2 and expanded into a working state from the folded state and folded from the working state, and the elevating work position C of being slid by a specified distance onto the housed position side from the expanded- folded position to carry out the elevating operation of the load receiving table 5. The work positioning device 7 is further provided for positioning the load receiving table 5 in the elevating work position C only when the load receiving table 5 expanded in the working state is slid onto the housed position side from the expanded-folded position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retractable loading / unloading device which can be lifted and lowered on a loading platform via a link mechanism so that the loading platform can be slid below the loading platform and stored. The present invention relates to a work positioning device for positioning a receiving table at a predetermined position.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, a retractable loading tray lifting device has a link mechanism having two upper and lower links b1 and b2 at the rear end of a vehicle frame a1 of a vehicle on which a loading platform a is mounted. A loading table c is provided via the link b, and the loading mechanism c is configured to be able to move up and down between the ground and the floor of the loading table a by the operation of the link mechanism b. And this receiving table c
Is configured to be foldable back and forth, and at the end of the lifting / lowering operation, with the distal end portion c1 of the load receiving table c folded toward the proximal end side, the entire end of the load receiving table c is indicated by a two-dot chain line. By turning the vehicle around the front of the vehicle,
As shown in FIG. 8, it is configured to be stored below the rear end of the loading platform a.

[0003]

However, in the above-mentioned conventional retractable loading / unloading device, the loading of the loading c is performed by rotating the loading c under the rear end of the loading a as described above. In the case where the retractable loading platform elevating device is mounted on the loading platform a of a new vehicle, when the loading platform c is rotated and stored, the loading platform c is moved to the rear end of the bottom surface of the loading platform a or the vehicle frame a1.
Will interfere with the rear end. Therefore, in order to avoid this interference, it is necessary to cut off the interfering parts d1 and d2 of the rear end of the bottom surface of the loading platform a and the rear end of the vehicle frame a1,
This cutting work is difficult and burdens the operator, and the work takes a long time.

[0004] In addition, when the vehicle is a refrigerating vehicle, there is a case where it is necessary to remove the heat insulating material disposed on the floor surface of the cargo bed by cutting off the interfering portion, which may cause a decrease in heat insulating performance. there were.

Therefore, the loading platform is configured to be slidable forward and backward below the rear of the loading platform, and the retractable loading platform is moved up and down so that the loading platform can be located further behind the lifting platform where the lifting operation is performed. By configuring the device and folding or unfolding the receiving tray with the receiving tray pulled out to the rear of the loading platform, it has been attempted to solve the above problem by avoiding interference between the receiving platform and the loading platform and the vehicle frame. Was.

[0006] However, in the above retractable loading tray elevating device, the lifting and lowering operation position of the loading tray is in the middle of the slide, and it is difficult to accurately arrange the loading tray in the middle of the slide. In the retractable loading tray elevating device having the above-described configuration, there has been a demand for a work positioning device capable of accurately positioning the loading tray at the lifting operation position.

[0007]

In the work positioning device in the retractable loading / unloading device of the present invention, the loading / unloading platform is provided on the loading platform via a link mechanism having two upper and lower links and a lower link. In addition, in the retractable loading / unloading device that is configured to be able to slide and store in the storage position below the loading platform in a state where the loading platform is folded back and forth, the loading platform is pulled out behind the loading platform. From the folded state to the working state and from the working state to the unfolding / folding position, and from the unfolding / folding position to the storage position side by a predetermined distance to perform the lifting / lowering operation of the loading / unloading table. It is configured so that it can be placed, and furthermore, when the loading tray expanded in the working state is slid from the unfolded / In which the work positioning device for positioning the platform at lifting the working position is provided.

[0008]

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

FIG. 1 shows a schematic configuration of a retractable loading tray elevating device according to the present invention.

In FIG. 1, reference numeral 1 denotes a loading platform mounted on a vehicle frame 11 of the vehicle, and a retractable loading platform lifting device 2 is provided below the rear end of the loading platform 1.

The retractable loading / unloading device 2 includes a mounting member 3 provided on a vehicle frame 11 and a link mechanism 4 attached to the mounting member 3.
And a receiving table 5 provided through the intermediary.

An attachment member 3 is provided with an outward U-shaped slide rail 12 disposed at the rear end of the vehicle frame 11 in the front-rear direction.
Are provided so as to be slidable in the front-rear direction. More specifically, the front and rear rollers 31, 31 provided above the mounting member 3 are rotatably disposed in the slide rail 12, and the mounting member 3 is manually or appropriately moved by the slide rail. By sliding along the slide 12, the entire retractable loading / unloading device 2 can be moved back and forth below the floor of the loading platform 1.

As an example of the moving means, as shown in FIG. 2, a chain 13 is stretched back and forth along the slide rail 12 below the slide rail 12, and the mounting member 3 And a sprocket 32 meshing with the sprocket 32 is provided.
Is rotated in the forward and reverse directions by an operation handle (not shown) via an appropriate transmission mechanism, so that the mounting member 3 is moved back and forth. The moving means may move the mounting member 3 back and forth using an actuator such as a motor or a cylinder in addition to the above configuration.

A drive shaft 6 is supported on the mounting member 3 substantially horizontally. A base end of a drive arm 61 is integrally fixed to the drive shaft 6, and a tip of a telescopic rod 62 a of a lift cylinder 62 provided on the mounting member 3 is connected to a tip of the drive arm 61.

The drive shaft 6 is integrally provided with a base end portion of a turning bracket 63, and a base end portion of a lift link 41 described later is pivotally supported at an intermediate portion of the turning bracket 63.

The link mechanism 4 includes a lift link 41 as a lower link and a connecting link 42 as an upper link.

The lift link 41 has a base end pivotally supported by a pivot 41a at an intermediate portion of the rotating bracket 63.

A contact bolt 64 provided at the distal end of the rotating bracket 63 is configured to be able to contact the lower surface of the lift link 41 near the base end thereof. By contacting the base 41 at a position near the base end from below, the expansion / contraction operation of the lift cylinder 62 is transmitted to the lift link 41 as the rotation operation of the rotation bracket 63 via the drive arm 61 and the drive shaft 6. As a result, the lift link 41 rotates up and down.

The connecting link 42 has its base end pivotally supported by the mounting member 3 by a pivot 42a.

Each of the above-mentioned members such as the slide rail 12, the mounting member 3, the link mechanism 4, the drive shaft 6, and the like are provided on both sides of the vehicle frame 11 in a right and left pair, and the left and right mounting members 3 synchronize the slide rail 12. It is connected by a connecting member 3a so as to slide.

The receiving table 5 includes a distal member 51 and a proximal member 52. The distal member 51 and the proximal member 52 are connected to each other by an upper hinge 53. The upper surface of the end side member 52 is made to be able to be folded in two.

On the left and right sides of the proximal end of the proximal end member 52, the distal ends of the left and right connecting links 42 are pivotally supported by pivots 42b at the upper part via brackets 54, and the left and right lift links are disposed at the lower part thereof. The tip of 41 is pivotally supported by a pivot 41b.

Further, the tip of the tip side member 51 is formed in a wedge shape, and when the loading table 5 reaches the ground, it tilts as shown by the dashed line in FIG. It is designed to be grounded.

Further, a work positioning device 7 is provided in the retractable loading tray elevating device 2.

As shown in FIG. 4, the work positioning device 7 includes a positioning hook 71 for positioning the mounting member 3 at the retractable loading / unloading device 2 when the retractable loading / unloading device 2 is positioned at the lifting / lowering operation position C. And an operation arm 72 for operating the hook 71.

The positioning hook 71 is provided with a slide block 73 inside the slide rail 12 as shown in FIG.
The upper end portion is pivotally supported via. And a hook portion 71a that engages with an engagement pin 33 (see FIG. 1) provided on the mounting member 3 is formed at the lower end portion. The engagement pin 33 is
For example, a pivot supporting the sprocket 32 may be used together.

The slide block 73 comprises a pair of left and right block members 73a. As shown in FIGS. 1 and 5, the slide block 73 is slidably disposed along guides 74 provided above and below the slide rail 12. 73a
The upper end of the positioning hook 71 is pivotally supported by a pin 75. The rear end of the slide block 73 is connected to the rear end of the slide rail 12 via an adjustment rod 76 as shown in FIG.
By adjusting the slide position of the slide block 73 with 6, the positioning hook 71 can be adjusted back and forth at an intermediate position of the slide rail 12. The lower guide 74 has a notch at a portion where the positioning hook 71 is disposed so as to allow the positioning hook 71 to rotate as shown in FIG.

As shown in FIG. 6, the upper end of the operating arm 72 is pivotally supported near the rear end of the slide rail 12, and a roller 72a is provided at the lower end thereof. And the middle part of the positioning hook 71 are connected by a connecting rod 77. The operating arm 72 is urged by a spring 78 (see FIG. 1) so that the roller 72a maintains a hanging position where the roller 72a projects downward from the slide rail 12.

On the other hand, the connecting rod 7 is
The positioning hook 71 connected via the hook 7 is disposed at a locking position where the hook portion 71a is locked with the engaging pin 33 of the mounting member 3 when the operating arm 72 is at the hanging position. When the operation arm 72 rotates upward against the urging force of the spring 78, the hook portion 71a rotates to a retracted position in which the hook portion 71a retracts upward from the locked position.

The roller 72a is moved only when the retractable loading / unloading device 2 is slid from the unfolding / folding position B to the lifting / lowering operation position C in a state where the loading tray 5 is folded. The rear arm 51 abuts on the back surface of the distal end member 51, whereby the operating arm 72 is rotated upward from the hanging position against the urging force of the spring 78. Therefore, in a state where the loading tray 5 is unfolded horizontally, even when the retractable loading tray elevating device 2 is moved from the unfolding / folding position B to the lifting / lowering work position C, the roller 72a may come into contact with the loading tray 5. Instead, the operating arm 72 is held in the hanging position.

Next, the operation of the work positioning device in the retractable loading / unloading device configured as above will be described.

First, as a basic operation of the retractable loading / unloading device 2, the retractable loading / unloading device 2 moves the mounting member 3 in a state where the loading tray 5 is folded by the operation of the moving means described above. The storage position A (see FIG. 2) where the slide member 12 is slid to the front end of the slide rail 12 and the load receiving table 5 which is folded by sliding the mounting member 3 to the rear end of the slide rail 12 are connected to the front end member 51 and the base end. The side receiving member 5 is unfolded so as to be horizontal, and the unfolded receiving tray 5 is unfolded.
Unfolding / folding position (see Fig. 3) B
A lifting / lowering operation position (see FIG. 1) C in which the mounting table 3 in a state where the attachment member 3 is slid to the middle position of the slide rail 12 and unfolded is moved up and down between the ground and the floor of the loading platform 1;
And have been made available for placement.

Next, the specific operation of the work positioning device 7 in the retractable loading tray elevating device 2 will be described.

First, a description will be given of a case where the loading / unloading operation of the luggage is performed by the retractable loading / unloading device 2 arranged at the storage position A as shown in FIG.

In the storage position A, the work positioning device 7
Of the operating arm 72
a is in the retracted position since it is in contact with the load receiving table 5 (see FIG. 2). In this state, the mounting member 3 is slid from the front end to the rear end of the slide rail 12 so that the load receiving table is slid. In a state in which the storage tray 5 is folded, the retractable loading / unloading device 2 is arranged at the unfolded / folded position B shown in FIG.

At this time, since the positioning hook 71 is disposed at the retracted position as described above, the positioning hook 71 does not interfere with the engaging pin 33 of the mounting member 3, whereby the mounting member 3 can be smoothly expanded and folded at the position B. You can slide up.

When the retractable loading tray elevating device 2 is arranged at the unfolded / folded position B in this way, the distal end member 51 of the folded loading tray 5 is rotated backward to be connected to the proximal end member 52. It unfolds so that tip side member 51 may become horizontal.
The unloading cradle 5 is deployed in a state where the entire cradle 5 is pulled out to the rear of the pallet 1 and the vehicle frame 11, so that the pallet 5 does not interfere with the pallet 1 and the vehicle frame 11.

On the other hand, when the retractable loading / unloading device 2 is placed at the unfolded / folded position B, the operation arm 72 of the work positioning device 7 moves the loading device 5 out of the loading platform 1 and the vehicle frame 11 to the roller position. By separating from 72a,
The spring 78 is disposed at the hanging position by the urging force (see FIG. 3).

In this state, when the retractable loading / unloading device 2 is slid from the unfolded / folded position B to the lifting / lowering operation position C, the unfolded loading tray 5 is moved to the operating arm 7.
It passes below the second roller 72a without contacting it. For this reason, the positioning hook 71 is in a state of being located at the locking position as shown in FIG. 1, and when the mounting member 3 reaches the elevating operation position C, the locking pin 33 is moved to the positioning hook 71.
, Thereby positioning the retractable loading / unloading pedestal lifting / lowering device 2 at the lifting / lowering work position C.

As a result, the loading table 5 is connected to the lift cylinder 6
By the expansion and contraction operation 2, it becomes possible to ascend and descend between the ground and the floor of the loading platform 1, and the loading and unloading work is carried out between the ground and the loading platform 1 through the loading tray 5 by this lifting and lowering operation.

Next, when the loading / unloading operation of the package is completed and the retractable loading / unloading device 2 is stored, the retractable loading / unloading device 2 is temporarily moved from the lifting / lowering operation position C to the unfolding / folding position B. It arrange | positions and the front end side member 51 of the loading stand 5 is folded in this position. The folding of the receiving platform 5 is performed in a state where the entire receiving platform 5 is pulled out to the rear of the loading platform 1 and the vehicle frame 11 in the same manner as the deployment of the receiving platform 5 described above. Do not interfere with.

Then, the retractable loading / unloading device 2 is slid from the unfolded / folded position B to the storage position A in a state where the loading tray 5 is folded as described above.

At this time, the positioning hook 71 of the work positioning device 7 is located at the retracted position because the roller 72a of the operating arm 72 comes into contact with the load receiving table 5 just before the positioning mounting member 3 reaches the elevating work position C. ing. As a result, even if the mounting member 3 reaches the elevating operation position C, the engagement pin 3
3 does not engage with the positioning hook 71. Therefore, the mounting member 3 slides to the storage position A side after passing the lifting / lowering work position C, whereby the retractable loading tray lifting / lowering device 2 is arranged at the storage position A.

By providing the work positioning device 7 in the retractable loading / unloading device 2 as described above, the retractable loading / unloading device 2 is mechanically moved to the lifting / lowering operation position C based on the state of the loading tray 5.
In addition, when storing, it can be positioned at the storage position by passing through the elevating operation position C without positioning at the elevating operation position C.
For this reason, the operation of the retractable loading tray elevating device can be easily performed, and workability can be remarkably improved.

Further, when the retractable loading / unloading device 2 is mounted on a new vehicle, it is not necessary to cut off the portion of the loading platform 1 or the rear end of the vehicle frame 11 that interferes with the loading device 5 as in the prior art. In addition, the mounting work becomes easy, and the working time can be shortened.

Although the present embodiment has been described with reference to the case in which the expansion / contraction operation of the lift cylinder 62 is transmitted to the lift link 41 serving as the lower link to rotate the lift cylinder 62 and thereby move the load receiver 5 up and down, the load receiver 5 is moved up and down. The lifting / lowering drive mechanism is not limited to this.
The drive may be carried by the two sides, and the drive source for rotating the lower link and the upper link is not limited to this.

[0047]

As described above, according to the work positioning device in the retractable loading / unloading device of the present invention, the retractable loading / unloading device is reliably positioned at the lifting / lowering operation position based on the state of the loading tray. It can be placed in the storage position by passing through this elevating work position without positioning at the elevating work position when storing.
The operation of the retractable loading / unloading device can be easily performed, and workability can be remarkably improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a work positioning device in a retractable loading tray elevating device of the present invention.

FIG. 2 is a side view showing a state where the apparatus is disposed at a storage position.

FIG. 3 is a side view showing a state where the descending device is arranged at a deployed / folded position.

FIG. 4 is an enlarged side view showing the configuration of the work positioning device.

FIG. 5 is a sectional view taken along line AA in FIG.

FIG. 6 is a sectional view taken along line BB in FIG. 4;

FIG. 7 is a side view showing a conventional retractable loading tray elevating device.

FIG. 8 is a side view showing a state in which a conventional retractable loading / unloading device is stored.

[Explanation of symbols]

 Reference Signs List 1 loading platform 2 retractable loading platform lifting device 3 mounting member 4 link mechanism 41 lift link (lower link) 42 connecting link (upper link) 5 loading platform 7 work positioning device A storage position B unfolding / folding position C lifting / lowering work position

Claims (1)

[Claims] 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 and a storage position below the loading platform. A retractable loading / unloading device configured to be slidable and retractable, wherein the loading / unloading platform is pulled out from the back of the loading platform to expand from a folded state to a working state and to fold from the working state. Position and a lifting / lowering operation position where the loading / unloading stage is moved up and down by sliding the loading / unloading stage by a predetermined distance from the unfolding / folding position. A work positioning device is provided for positioning the load receiving table at the elevating work position only when the work table is slid from the storage position to the storage position. Work positioning device in a retractable receiving platform lifting apparatus.