JP4137723B2 - Retractable cradle lifting device with bumper function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a retractable cradle lifting device configured to be slidable back and forth along a guide rail between a stowage position below a load carrier and a work position behind the load carrier, and in particular, a retractable type having a bumper function. The present invention relates to a load receiving table lifting device.
[0002]
[Prior art]
Conventionally, a load receiving platform is provided on the loading platform via a link mechanism so as to be movable up and down, and the load receiving platform side including the link mechanism and the lifting mechanism is operated by a sliding cylinder extending and retracting the loading position below the loading platform and the work behind the loading platform. 2. Description of the Related Art A retractable cradle lifting device configured to be slidable back and forth along a guide rail between positions is provided (for example, see Patent Document 1).
[0003]
Specifically, as shown in FIG. 4, the retractable load receiving table lifting device is provided with a mounting member c movably back and forth along a guide rail b provided below the rear part of the loading platform a. The base ends of the two upper and lower link members d1 and d2 constituting the link mechanism d are pivotally supported, and the distal ends of the link members d1 and d2 are pivotally supported by the load receiving table e via a bracket e4. .
[0004]
The load receiving stand e is composed of a base end deck e1, an intermediate deck e2, and a front end deck e3, and the front ends of the link members d1 and d2 are pivotally supported on the base end deck e1 via the bracket e4. In the storage state shown in FIG. 4, it is folded into three.
[0005]
Then, by extending the slide cylinder f connected to the loading platform a side and the loading platform e side, the loading platform e is arranged after being placed at the working position protruding rearward from the storage position shown in FIG. e is unfolded to be in a horizontal state, and the link mechanism d is turned up and down by the lifting cylinder g, so that the load receiving platform e is moved up and down between the ground and the loading platform a to load and unload the load. . Further, when traveling or the like, the load receiving platform e is arranged from the working position to the retracted position by the reverse operation.
[0006]
By the way, some retractable load receiving device lifting / lowering devices configured as described above have a bumper function. Specifically, a bumper member h is provided over the rear end of the base end deck e1 so as to be laid over the left and right brackets e4 (see FIG. 5).
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-248984
[Problems to be solved by the invention]
However, the retractable load receiving device lifting apparatus having the bumper function as described above has the following problems.
[0009]
Since the bumper member h is provided at the rear end portion of the base end deck e1, the bumper member h is disposed at a low position close to the ground. For this reason, when there is an obstacle behind the vehicle when the vehicle is moved backward, it is easy to interfere with the obstacle, and this interference tends to cause damage to the device or the vehicle body.
[0010]
[Means for Solving the Problems]
The retractable load receiving device lifting apparatus having a bumper function according to the first aspect of the present invention includes a load receiving table that is foldable on the load table via a link mechanism and can be moved up and down by an elevating means. A bumper function in which the load receiving platform side including the mechanism and the lifting means is configured to be slidable back and forth along the guide rail between the storage position below the loading platform and the work position behind the loading platform, and the bumper member is provided on the load receiving platform. In the retractable load receiving device lifting apparatus, the upper link and the lower link of the link mechanism are pivotally supported on the base end deck of the load receiving base via brackets, and the bumper member is located above the base end deck of the load receiving stand. It is provided only at the rear end of the upper deck folded in the middle .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 shows the configuration of a retractable load receiving device lifting apparatus having a bumper function according to the present invention.
[0013]
In FIG. 1, reference numeral 1 denotes a loading platform mounted on a vehicle body frame 11, and a retractable loading platform lifting device 2 is provided below the rear end of the loading platform 1.
[0014]
The retractable load receiving table lifting / lowering device 2 includes an attachment member 3 provided on the vehicle body frame 11 and a load receiving stand 5 provided on the attachment member 3 via a link mechanism 4.
[0015]
The attachment member 3 is slidable in the front-rear direction along an outward U-shaped guide rail 12 disposed in the front-rear direction at the rear end portion of the vehicle frame 11. Specifically, front and rear rollers (not shown) provided on the mounting member 3 are disposed so as to be able to roll in the guide rail 12, and the guide rail 12 is extended and retracted by the slide cylinder 6 described later. The entire retractable load receiving device lifting device 2 on the load receiving table 5 side is configured to be slidable back and forth below the floor surface of the loading table 1.
[0016]
The link mechanism 4 includes a lower link 41 and an upper link 42. The base ends of the lower link 41 and the upper link 42 are pivotally supported on the mounting member 3 side, and are moved up and down by a lifting cylinder 43 as a lifting means connected to the lower link 41 and the mounting member 3. It is configured to be rotatable.
[0017]
A pair of left and right members such as the guide rail 12, the mounting member 3, the link mechanism 4, and the elevating cylinder 43 described above are provided on both sides of the vehicle frame 11, so that the left and right mounting members 3 slide on the guide rail 12 in synchronization. Are connected by a connecting member 3a.
[0018]
The load receiving platform 5 includes a proximal deck 51, an intermediate deck 52, and a distal deck 53. The intermediate deck 52 is connected to the proximal deck 51 via a hinge (not shown). The front end deck 53 is provided to the intermediate deck 52 via a hinge (not shown) so as to be foldable (below the intermediate deck 52 in the retracted state). That is, in the storage state shown in FIG. 1, the entire cargo receiving stand 5 is folded in three.
[0019]
And the front-end | tip part of the said up-and-down links 41 and 42 is pivotally supported by the said base end deck 51 via the bracket 55. FIG. Specifically, the tip portions of the left and right upper links 42 are pivotally supported on the upper portion of the bracket 55, and the tip portions of the left and right lower links 41 are pivotally supported on the lower portion of the bracket 55.
[0020]
Further, the tip of the tip deck 53 is formed in a wedge shape, and is tilted when the load receiving platform 5 reaches the ground, so that the tip is grounded to the ground without any step.
[0021]
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 guide rail 12 with the load receiving stand 5 folded by the expansion / contraction operation of the slide cylinder 6 ( (See FIG. 1), and although not shown, the mounting member 3 is slid to the rear end of the guide rail 12 and the folded load receiving platform 5 is developed. In this expanded state, the load receiving platform 5 is placed on the ground and the floor surface of the loading platform 1. It can be arranged at a working position where it is moved up and down.
[0022]
The above-mentioned slide cylinder 6 has its telescopic rod connected to the loading platform 1 on the fixed side, and the base end of the cylinder body is connected to the loading platform 5 on the slide side. The slide cylinder 6 is in a state of being positioned in the retracted position shown in FIG. 1 has a degraded state, the receiving platform 5 side be extended operated to place the work sector position. The slide cylinder 6 may be provided, for example, as a pair of left and right, or one in the center.
[0023]
By the way, the retractable load receiving device lifting device 2 configured as described above is provided with a bumper member 7 in order to give the retractable load receiving device lifting device 2 a bumper function.
[0024]
Specifically, the bumper member 7 is disposed across the width direction at the rear end of the intermediate deck 52 of the load receiving platform 5 in a folded state. Accordingly, when the load receiving platform 5 is placed at the working position and deployed, the bumper member 7 rotates together with the intermediate deck 52 and is disposed between the intermediate deck 52 and the proximal deck 51. In consideration of this, the bumper member 7 is provided at the rear end of the intermediate deck 52.
[0025]
That is, the bumper member 7 is provided at the rear end of the intermediate deck 52 serving as the upper deck of the folded load receiving platform 5.
[0026]
By providing the bumper member 7 in this manner, when the load receiving platform 5 is stored, the bumper member 7 is disposed above the proximal deck 51 as shown in FIG. In this state, only the bracket 55 portion remains.
[0027]
Next, the operation of the retractable load receiving table elevating device 2 configured as described above will be described.
[0028]
First, in order to place the retractable load receiving device lifting device 2 from the storage position stored below the load carrier 1 to the work position as shown in FIG. 1, the slide cylinder 6 is extended. By the extension operation of the slide cylinder 6, the entire retractable load receiving device lifting / lowering device 2 slides along the guide rail 12 toward the rear end side of the load carrier 1, thereby being arranged at the working position.
[0029]
Then, when the retractable load receiving device elevating device 2 is arranged at the working position in this way, although not shown, the intermediate deck 52 of the folded load receiving table 5 is rotated rearward together with the front end deck 53 so that the intermediate deck 52 Is deployed on the same horizontal plane as the proximal deck 51. Subsequently, the front end deck 53 is rotated backward, and the front end deck 53 is developed so as to be on the same horizontal plane as the base end deck 51 and the intermediate deck 52. As a result, the load receiving platform 5 can be moved up and down between the ground and the floor surface of the loading platform 1 by the lifting cylinder 43, and the loading and unloading work between the ground and the loading platform 1 through the load receiving platform 5 by this lifting operation. I do.
[0030]
Next, when the loading and unloading work is completed and the retractable load receiving device lifting / lowering device 2 is stored, the retractable load receiving device lifting / lowering device 2 is arranged from the working position to the retracted position by the reverse operation to the operation described above. . That is, in the work position, after placing the load receiving platform 5 of the retractable load receiving platform lifting / lowering device 2 at a predetermined height, each deck 51, 52, 53 of the load receiving platform 5 is folded in three and slides in this state. The cylinder 6 is degenerated. Due to the retracting operation of the slide cylinder 6, the entire retractable load receiving device lifting device 2 slides along the guide rails 12 below the load carrier 1, and is disposed at the retracted position as shown in FIG.
[0031]
Here, since the bumper member 7 is provided at the rear end of the intermediate deck 52 as described above, when the load receiving platform 5 is stored, it is compared with the conventional one provided on the base deck 51 side. It can be placed at a high position relative to the ground. Thereby, although the portion of the bracket 55 protrudes downward on the base end deck 51 side, the space portion can be formed in a wide range in the width direction except for the portion of the bracket 55.
[0032]
Therefore, even when there is an obstacle behind the vehicle when the vehicle is moved backward, interference can be avoided in the portion corresponding to the space portion. For this reason, the frequency with which the bumper member 7 interferes with the obstacle can be reduced, and thereby the frequency with which damage to the device and the vehicle body due to this interference can be minimized. In particular, in the conventional bumper structure, the portion of the bumper member outside the bracket 55 frequently interferes with an obstacle or the like, but this can be avoided.
[0033]
FIG. 3 shows another example of the bumper member.
[0034]
The bumper member 7 is disposed only in a range corresponding to the space between the left and right brackets 55 at the rear end of the intermediate deck 52, and this can also provide the same effect as described above.
[0035]
Note that the above-described embodiment is merely a preferred embodiment of the present invention, and the present invention is not limited to this, and various design changes can be made within the scope thereof.
[0036]
For example, the load cylinder 5 is arranged at the retracted position and the working position by the slide cylinder 6. However, the means for sliding the load receiver 5 is not limited to this, and a motor may be used, or the slide may be manually performed. The structure to be made may be sufficient.
[0037]
Further, although the load receiving platform 5 has been described as being folded in three, for example, it may be folded in two including a proximal deck and a leading deck. In this case, a bumper member may be provided at the rear end of the front end deck folded upward with respect to the base end deck.
[0038]
【The invention's effect】
As described above, according to the retractable load receiving device lifting apparatus having the bumper function of the present invention, the bumper member is provided only at the rear end of the upper deck folded above the base end deck of the load receiving stand. The frequency with which the member interferes with the obstacle can be reduced, and thereby the frequency with which the device and the vehicle body are damaged due to this interference can be reduced as much as possible.
[Brief description of the drawings]
FIG. 1 is a side view showing a retractable cradle lifting device having a bumper function according to the present invention.
FIG. 2 is a rear view of the retractable load receiving table lifting device.
FIG. 3 is a rear view showing another example of the bumper member.
FIG. 4 is a side view of a conventional retractable cradle lifting device having a bumper function.
FIG. 5 is a rear view showing a conventional retractable load receiving table lifting device.
[Explanation of symbols]
1 Loading platform 12 Guide rail 4 Link mechanism 43 Lifting cylinder (lifting means)
5 Receiving platform 52 Intermediate deck 7 Bumper member

Claims (1)

A load receiving base that can be folded via a link mechanism is provided on the loading platform so that it can be raised and lowered by the lifting and lowering means, and when the loading platform is folded, the loading platform including the link mechanism and the lifting and lowering means In a retractable load receiving and lowering device having a bumper function that is configured to be slidable back and forth along the guide rail between the work position and a bumper member provided on the load receiving stand, a bracket is attached to a base end deck of the load receiving stand A bumper characterized in that the upper link and the lower link of the link mechanism are pivotally supported via the boss, and the bumper member is provided only at the rear end of the upper deck folded above the base end deck of the load receiving platform. Retractable cradle lifting device with function.

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