JP4197219B2 - Retractable loading platform lifting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a retractable load receiving and lifting device capable of storing a load receiving platform provided on a loading platform so as to be movable up and down via a link mechanism.
[0002]
[Prior art]
Conventionally, as shown in FIG. 7, the retractable load receiving device elevating apparatus receives a load via a link mechanism b having two upper links b1 and two lower links b2 at the rear end of a vehicle frame a1 on which a load carrier a is mounted. A platform c is provided, and the load receiving platform c is configured to be movable up and down between the ground and the floor surface of the platform a by the operation of the link mechanism b. The load receiving table c is configured to be foldable back and forth. When the lifting operation is completed, the entire load receiving table c is shown by a two-dot chain line with the distal end portion c1 of the load receiving table c folded to the base end side. As shown in FIG. 8, the vehicle is stored below the rear end of the loading platform a as shown in FIG.
[0003]
[Problems to be solved by the invention]
However, in the conventional retractable load receiving / lifting device, since the load receiving stand c is stored by rotating it below the rear end of the load receiving platform a as described above, it is retractable to the load receiving platform a of a new vehicle. In the case of mounting the load receiving table elevating device, when the load receiving table c is rotated and stored, the load receiving table c interferes with the rear end of the bottom surface of the load carrier a and the rear end of the vehicle frame a1. Therefore, in order to avoid this interference, the parts d1 and d2 that interfere with the rear end of the bottom surface of the loading platform a and the rear end of the vehicle frame a1 must be cut. However, there is a problem that it takes a long time to work.
[0004]
In addition, when the vehicle is a freezer car, there may be a case where the heat insulating material disposed on the floor surface of the cargo bed has to be removed by cutting an interfering portion, which may cause a decrease in heat insulating performance.
[0005]
[Means for Solving the Problems]
The retractable load receiving device lifting apparatus of the present invention is provided in such a manner that the load receiving table can be moved up and down via a link mechanism having two upper and lower upper links and a lower link, and the load receiving table is folded back and forth. In the retractable load receiving device lifting and lowering apparatus configured to be slidable to the storage position below the loading platform, the loading platform is pulled out from the loading platform and folded to a working state, and the operation is performed. The unfolding / folding position for folding from the state, and the lifting / lowering operation position for moving the load receiving table up and down by sliding a predetermined distance from the unfolding / folding position to the storage position side are configured.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0007]
FIG. 1 shows a schematic configuration of a retractable cargo receiver lifting device according to the present invention.
[0008]
In FIG. 1, reference numeral 1 denotes a loading platform mounted on a vehicle frame 11, and a retractable loading platform elevating device 2 is provided below the rear end of the loading platform 1.
[0009]
The retractable load receiving table lifting / lowering device 2 includes an attachment member 3 provided on the vehicle frame 11 and a load receiving stand 5 provided on the attachment member 3 via a link mechanism 4.
[0010]
The mounting member 3 is slidable in the front-rear direction along an outward U-shaped slide rail 12 disposed in the front-rear direction at the rear end of the vehicle frame 11. Specifically, the front and rear rollers 31, 31 provided above the mounting member 3 are disposed so as to be able to roll within the slide rail 12, and the mounting member 3 can be moved manually or by an appropriate moving means. 12, the entire retractable load receiving device lifting device 2 is configured to be movable back and forth below the floor surface of the load carrier 1.
[0011]
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 at the lower portion of the slide rail 12, and meshes with the attachment member 3 from below. A sprocket 32 is provided, and the attachment member 3 is moved back and forth by rotating the sprocket 32 in a forward and reverse direction via an appropriate transmission mechanism by an operation handle (not shown). 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-described configuration.
[0012]
A drive shaft 6 is supported on the mounting member 3 substantially horizontally. A base end portion of a drive arm 61 is integrally fixed to the drive shaft 6, and a distal end of a telescopic rod 62 a of a lift cylinder 62 provided on the mounting member 3 is connected to the distal end portion of the drive arm 61.
[0013]
Further, the drive shaft 6 is integrally provided with a base end portion of a rotation bracket 63, and a base end portion of a lift link 41 described later is pivotally supported at an intermediate portion of the rotation bracket 63.
[0014]
The link mechanism 4 includes a lift link 41 as a lower link and a connecting link 42 as an upper link.
[0015]
The lift link 41 has a base end portion pivotally supported by a pivot 41 a in the middle of the rotating bracket 63.
[0016]
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 portion. By abutting on the part closer to the end from below, the expansion / contraction operation of the lift cylinder 62 can be 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.
[0017]
The base end of the connecting link 42 is pivotally supported on the mounting member 3 by a pivot 42a.
[0018]
A pair of left and right members such as the slide rail 12, the mounting member 3, the link mechanism 4, and the drive shaft 6 described above are provided on both sides of the vehicle frame 11, and the left and right mounting members 3 slide in synchronization with the slide rail 12. Are connected to each other by a connecting member 3a.
[0019]
The load receiving platform 5 includes a distal end side member 51 and a proximal end side member 52, and the distal end side member 51 and the proximal end side member 52 are separated from each other by an upper hinge 53. The upper surface of 52 can be folded in two.
[0020]
On the left and right sides of the base end portion of the base end side member 52, the tip ends of the left and right connecting links 42 are pivotally supported by pivots 42 b on the upper portions thereof via brackets 54, and the tips of the left and right lift links 41 are located below the lower ends. The part is pivotally supported by the pivot 41b.
[0021]
Further, the tip of the front end side member 51 is formed in a wedge shape, and when the load receiving platform 5 reaches the ground, it tilts as shown by a one-dot chain line in FIG. Has been made.
[0022]
The retractable load receiving device lifting / lowering device 2 configured as described above has a storage position in which the mounting member 3 is slid to the front end portion of the slide rail 12 and stored in a state in which the load receiving stand 5 is folded by the operation of the moving means described above ( (See FIG. 2) A and the load receiving base 5 which is folded by sliding the mounting member 3 to the rear end of the slide rail 12 is expanded so that the front end side member 51 and the base end side member 52 are horizontal, The unfolding / folding position (see FIG. 3) B for folding the unfolded loading platform 5 and the loading platform 5 in the expanded state by sliding the mounting member 3 to the middle position of the slide rail 12 are the ground and the floor surface of the loading platform 1. Can be disposed at a lifting work position (see FIG. 1) C that is lifted and lowered.
[0023]
Next, the operation of the above-described retractable load receiving table lifting device will be described.
[0024]
First, as shown in FIG. 2, when loading and unloading work is performed by the retractable load receiving device lifting device 2 disposed at the storage position A, the mounting member 3 is slid from the front end portion of the slide rail 12 to the rear end portion. By doing so, the retractable load receiving device lifting device 2 is disposed at the unfolding / folding position B shown in FIG.
[0025]
Subsequently, the distal end side member 51 of the load receiving tray 5 folded at this position is rotated rearward so that the proximal end side member 52 and the distal end side member 51 are deployed horizontally. Thereafter, the mounting member 3 is slid forward from the rear end portion of the slide rail 12 and placed at the lifting / lowering operation position C shown in FIG. As a result, the load receiving platform 5 can move up and down between the ground and the floor of the loading platform 1 by the expansion and contraction operation of the lift cylinder 62, and the lifting and lowering operation allows the load receiving platform 5 to move between the ground and the loading platform 1 through the load receiving platform 5. Perform unloading work.
[0026]
When the load unloading operation is completed and the retractable load receiving device lifting device 2 is stored, the retractable load receiving device lifting device 2 is arranged at the storage position A by the operation reverse to the operation described above. That is, the retractable load receiving table lifting / lowering device 2 is temporarily arranged from the lifting / lowering operation position C to the unfolding / folding position B, the front end side member 51 of the load receiving stand 5 is folded at this position, and the mounting member 5 is folded. 3 is slid from the rear end portion of the slide rail 12 to the front end portion, and the retractable load receiving device elevating device 2 is arranged at the storage position A.
[0027]
That is, the deployment or folding of the load receiving platform 5 is performed in a state where the retractable load receiving platform lifting / lowering device 2 is arranged at the unfolding / folding position B so that the entire load receiving platform 5 is pulled out behind the loading platform 1 and the vehicle frame 11. Therefore, even if the loading platform 5 is expanded or folded at this position, the loading platform 5 does not interfere with the loading platform 1 and the vehicle frame 11. Therefore, when the retractable load receiving device elevating device 2 is mounted on a new vehicle, there is no need to cut the rear end portion of the load carrier 1 or the vehicle frame 11 that interferes with the load receiving stand 5 as in the prior art. And the working time can be shortened.
[0028]
In the present embodiment, the lift link 41 as the lower link is transmitted and rotated by the lift cylinder 62 and rotated to thereby lift and lower the load receiving platform 5. The mechanism is not limited to this, and it may be carried on the connecting link 42 side as the upper link, and the driving source for rotating the lower link and the upper link is not limited to this.
[0029]
Here, when the retractable load receiving device elevating device 2 is arranged at the elevating work position C as described above, it is reliably arranged at a predetermined position of the slide rail 12 that becomes the elevating work position C while sliding the mounting member 3. There is a need to. As this means, for example, each of the slide rail 12 and the mounting member 3 is provided with pin holes that match in a state where the mounting member 3 is disposed at a predetermined position, and a locking pin is inserted into both pin holes, Both may be positioned, or a positioning device 7 (see FIG. 4) for mechanically positioning the retractable load receiving device lifting device 2 at the lifting operation position C only when the load receiving device 5 is deployed. Good.
[0030]
As shown in FIG. 4, the positioning device 7 operates the positioning hook 71 for positioning the mounting member 3 at the position when the retractable load receiving device elevating device 2 is arranged at the elevating work position C, and this positioning hook 71. And an actuating arm 72 to be operated.
[0031]
As shown in FIG. 5, the positioning hook 71 is pivotally supported on the inner side of the slide rail 12 via a slide block 73, and an engaging pin 33 (see FIG. 1) provided on the attachment member 3 at the lower end. ) And a hook portion 71a to be engaged with the other. For example, the engaging pin 33 may be used in combination with a pivot that supports the sprocket 32.
[0032]
The slide block 73 includes a pair of left and right block members 73a, and is slidably disposed along guides 74 provided on the inner and upper sides of the slide rail 12 as shown in FIGS. An upper end portion of the positioning hook 71 is pivotally supported by a pin 75. Further, as shown in FIG. 4, the rear end portion of the slide block 73 is connected to the rear end portion of the slide rail 12 via an adjustment rod 76, and the slide position of the slide block 73 is adjusted by the adjustment rod 76. Thus, the positioning hook 71 can be adjusted in the front-rear direction at the midway position of the slide rail 12. The lower guide 74 is cut out at a portion where the positioning hook 71 is disposed so as to allow the positioning hook 71 to rotate as shown in FIG.
[0033]
As shown in FIG. 6, the operating arm 72 is pivotally supported at its upper end near the rear end of the slide rail 12 and has a roller 72a at its lower end. And a midway portion of the positioning hook 71 are connected by a connecting rod 77. Further, the operating arm 72 is biased by a spring 78 (see FIG. 1) so that the roller 72a maintains a suspended position where the roller 72a protrudes downward from the slide rail 12.
[0034]
On the other hand, the positioning hook 71 connected to the operating arm 72 via the connecting rod 77 is engaged with the engaging pin 33 of the mounting member 3 when the operating arm 72 is in the suspended position. When the operating arm 72 is rotated upward against the urging force of the spring 78, the hook portion 71a is pivoted from the latching position to the retracted position. It is made to do.
[0035]
The roller 72a is a member on the tip side of the load receiving platform 5 only when the retractable load receiving device lifting / lowering device 2 is slid from the unfolding / folding position B to the lifting / lowering operation position C with the load receiving platform 5 folded. 51 abuts against the back surface of the actuator 51, thereby rotating the operating arm 72 upward from the hanging position against the biasing force of the spring 78. Therefore, in the state where the load receiving platform 5 is deployed horizontally, the roller 72a can contact the load receiving platform 5 even if the retractable load receiving platform lifting device 2 is moved from the unfolding / folding position B to the lifting operation position C side. Instead, the operating arm 72 is held in the suspended position.
[0036]
The positioning device 7 operates in such a manner that the retractable load receiving device lifting device 2 is located at the retracted position A and the roller 72a of the operating arm 72 contacts the load receiving stand 5 so that the positioning hook 71 is located at the retracted position. (See FIG. 2). Therefore, when the retractable load receiving table lifting device 2 is slid from the storage position A to the unfolding / folding position B, the positioning hook 71 does not interfere with the engagement pin 33 of the mounting member 3 and the mounting member 3 is smoothly moved. Can be slid.
[0037]
In this manner, in the state where the retractable load receiving device lifting / lowering device 2 is arranged at the unfolding / folding position B, the load receiving stand 5 is pulled out behind the load supporting plate 1 and the vehicle frame 11, so that the operating arm 72 is moved by the biasing force of the spring 78. It will be arranged in the drooping position (see FIG. 3).
[0038]
Then, when the retractable load receiving table elevating device 2 is slid from the unfolding / folding position B to the lifting / lowering operation position C side in a state where the load receiving table 5 folded at the unfolding / folding position B is horizontally expanded, The platform 5 does not contact the roller 72a of the operating arm 72 and passes below it. For this reason, the positioning hook 71 is arranged at the locking position as shown in FIG. 1, and when the mounting member 3 reaches the lifting / lowering operation position C, the locking pin 33 is attached to the hook portion 71 a of the positioning hook 71. Thus, the retractable load receiving table elevating device 2 can be positioned at the elevating work position C.
[0039]
When the retractable load receiving device elevating device 2 is folded at the unfolded / folded position B and slid from the unfolded / folded position B to the retracted position A side after the operation is completed, the mounting member 3 moves up and down. The roller 72a of the operating arm 72 comes into contact with the load receiving platform 5 just before reaching the position, and the positioning hook 71 is disposed at the retracted position. Therefore, even if the attachment member 3 reaches the lifting / lowering operation position C, the engaging pin 33 does not engage with the positioning hook 71, so that the retractable load receiving table lifting / lowering device 2 passes through the lifting / lowering operation position C and the storage position A Placed in.
[0040]
By providing such a positioning device 7 in the retractable load receiving device elevating device 2, the retractable load receiving device elevating device 2 can be easily arranged at the elevating work position C, and workability can be significantly improved. .
[0041]
【The invention's effect】
As described above, according to the retractable load receiving device lifting apparatus of the present invention, the load receiving table is unfolded from the folded state by being pulled out to the rear of the load table, and is expanded and folded from the above working state. The rear end that interferes with the loading platform and the loading platform of the vehicle frame as in the past by allowing the loading platform to slide up a predetermined distance from the unfolded / folded position to the retracted position and allowing the loading platform to move up and down. Without having to cut the part of the part, the retractable load receiving device lifting device can be easily attached to a new vehicle, so that the work load can be reduced and the work time can be shortened. it can.
[Brief description of the drawings]
FIG. 1 is a side view showing a state in which a retractable load receiving device lifting apparatus according to the present invention is disposed at a lifting work position.
FIG. 2 is a side view showing a state in which the retractable cargo receiving platform lifting device is also disposed at the retracted position.
FIG. 3 is a side view showing a state in which the retractable load receiving table lifting device is also disposed at the unfolded / folded position.
FIG. 4 is an enlarged side view showing the configuration of the positioning device.
5 is a cross-sectional view taken along line AA in FIG.
6 is a cross-sectional view taken along the line BB in FIG.
FIG. 7 is a side view showing a conventional retractable cargo receiving table lifting device.
FIG. 8 is a side view showing a state in which a conventional retractable cargo receiver lifting device is stored.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Loading platform 2 Retractable loading platform lifting device 3 Mounting member 4 Link mechanism 41 Lift link (downward link)
42 Link (Uplink)
5 Receiving platform A Storage position B Unfolding / folding position C Elevating work position

Claims (1)

The loading platform is provided on the loading platform through a link mechanism having two upper and lower upper links and a lower link. The loading platform can be moved up and down, and the loading platform is folded back and forth to slide to the storage position below the loading platform. In a retractable load receiving device lifting device configured to be able to
The loading platform is pulled out rearward of the loading platform and unfolded from the folded state to the working state, and unfolded / folded from the working state, and slid a predetermined distance from the unfolded / folded position to the storage position side. A retractable load receiving device lifting apparatus characterized in that it can be disposed at a lifting operation position for performing a lifting operation of the load receiving table.

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