JP2002052972A - Storage type cargo receiving base elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage type cargo receiving base elevator high in safety capable of reducing impact generated at the time when a carriage passes through a clearance formed on the folded part of the cargo receiving base, preventing cargo breakage, etc., due to the impact and also reducing impact noise generated by the impact in a foldable cargo receiving base. SOLUTION: An upper surface head end edge 52a of a base end side member 52 on the cargo receiving base 5 is formed so that a clearance S formed between itself and a head end side member 51 becomes small on the storage type cargo receiving base elevator constituted by providing the cargo receiving base 5 free to elevate through a link mechanism having two pieces of an upper link and a lower link vertically on a load carrying platform, free to fold the cargo receiving base 5 at least into two in the longitudinal direction by the base end side member 52 and the head end side member 51 and to the cargo receiving base 5 at a storing position below the load carrying platform by sliding it in such a state where the cargo receiving base 5 is folded in the longitudinal direction.

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 capable of storing a loading tray slidably moved below a loading platform provided on a loading platform via a link mechanism. The present invention relates to a structure of a receiving table which can be folded back and forth.

[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
The front end member c1 is configured to be foldable back and forth with respect to the base end member c2, and at the end of the lifting / lowering operation, the front end member c1 of the load receiving table c is folded on the base end member c2. Then, by sliding the entire receiving table c forward from the rear of the loading table a along the slide rail d,
It was designed to be stored below the loading platform a.

In order to make the receiving table c foldable back and forth as described above, the base member c2 and the distal member c1 of the receiving table c are connected by a hinge structure as shown in FIG. Are linked by More specifically, one end of the hinge plate e is pivotally supported by the hinge pin e1 at the distal end of the proximal member c2, and the other end of the hinge plate d is hinged to the proximal end of the distal member c1.
It is pivoted by two. Accordingly, the distal end member c1 pivots upward around the hinge pin e2 while the hinge plate e pivots upward around the hinge pin e1, thereby causing the distal end member c1 to pivot toward the proximal end as shown in FIG. Member c2
It is foldable up.

[0004]

However, in the structure of the load receiving table c in the above-mentioned conventional retractable loading table elevating device, when the distal member c1 is folded toward the proximal member c2, the base member c1 is closed. Since the end portion rotates while drawing a locus X as shown by a dashed line in FIG. 8, this tip side member c1
In order to avoid interference between the base end of the base member c2 and the front end of the base member c2, a clearance is indispensable. As a result, when the distal-side member c1 is unfolded so as to be on the same horizontal plane as the proximal-side member c2 during the operation, the distance between the proximal end of the distal-side member c1 and the distal end of the proximal-side member c2 is increased. Means that a gap S corresponding to the clearance is inevitably generated.

[0005] The gap S gives an impact to the carrier when the carrier is passing therethrough, and this impact may cause the load on the carrier to collapse, and the wheels of the carrier may fall. There was a problem that would lead to a major accident. Also, the impact sound caused by the impact is
This gives the worker anxiety.

Further, since the distal end surface of the proximal member e2 is exposed rearward when the distal member e1 is folded,
As shown in FIG. 8, a reflector f may be attached to the front end surface to call attention to the following vehicle. However, when the reflector f is attached, the gap S is further increased, and the above-described problem is caused. Will appear remarkably.

[0007]

According to the first aspect of the present invention, a retractable loading / unloading device is provided on a loading platform such that the loading platform can be raised and lowered via a link mechanism having two upper and lower links. At the same time, the loading tray is foldable back and forth between the base member and the distal member at least two times, so that the loading tray can be slid and stored in the storage position below the loading platform in a state of being folded forward and backward. In the retractable loading / unloading device configured as described above, the top edge of the upper surface of the base-side member in the loading tray is formed so as to protrude so that a gap formed between the upper-side member and the distal-side member is reduced.

[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.

[0013] As an example of the moving means, a chain 13 is provided below the slide rail 12.
2, a sprocket 32 meshing with the chain 13 from below is provided on the mounting member 3, and the sprocket 32 is moved in a forward / reverse direction by an operation handle (not shown) via an appropriate transmission mechanism. , The mounting member 3 is moved back and forth. In addition, as the moving means, an actuator such as a motor or a cylinder may be used to move the mounting member 3 back and forth 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 4 as an upper link.
And 2.

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 a hinge structure described later. The upper surface of the proximal 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.

The hinge structure for connecting the distal end member 51 to the proximal end member 52 so as to be foldable is as shown in FIG.

In this hinge structure, a hinge plate 53 is interposed between the distal end of the proximal member 52 and the proximal end of the distal member 51.
3 has a hinge pin 53 at the distal end of the proximal member 52.
a, and the other end of the hinge plate 53 is pivotally supported on the distal end of the distal end member 51 by a hinge pin 53b.

Therefore, when the distal end member 51 is folded from the expanded state, first, the distal end member 51 moves the hinge pin 53b while the base edge 51a of the upper surface of the distal end member 51 draws a locus X indicated by a dashed line. By pivoting upward about the center (see a two-dot chain line in FIG. 4), the hinge plate 53 pivots upward about the hinge pin 53a, and as shown in FIG.
As shown in FIG. 3 and FIG.
Folds up. When the distal-end-side member 51 is expanded from the folded state, the operation is performed in a reverse manner to that described above.

Here, the top end edge 52 of the base end member 52
“a” is formed so as to protrude toward the distal end side member 51 in a range that does not conflict with the trajectory X. That is, the proximal member 52
Is formed by bending the top edge 52a at an acute angle so that the tip is close to the tip-side member 51, and bending a little below again to form a vertical surface that is the tip surface.

Thus, the proximal member 52 and the distal member 5
The gap S on the upper surface with respect to 1 can be made as small as possible. By making the gap S as small as possible, it is possible to reduce the impact generated when the transport vehicle passes through the gap S, to prevent collapse of the load due to the impact, and also to reduce the impact sound generated by the impact. Can be.

Further, as shown in FIG.
A space for adhering the reflection plate 55 to the tip end surface can be ensured with the gap S as small as possible. The reflecting plate 55 is provided to call attention to a following vehicle at night or the like, and the distal end surface is exposed rearward when the distal end member 51 is folded,
By attaching a reflector 55 to the front end surface, the light of the following vehicle is reflected.

In the retractable loading / unloading device 2 constructed as described above, the mounting member 3 is slid to the front end of the slide rail 12 and stored in a state in which the loading tray 5 is folded by operating the moving means described above. Storage position (see Fig. 2) A
The mounting member 3 is slid to the rear end of the slide rail 12 so that the folded receiving table 5 is unfolded so that the distal end member 51 and the proximal end member 52 are horizontal, and the unfolded receiving table 5 is expanded. The loading / unfolding position (see FIG. 3) B where the folding is performed, and the loading tray 5 in a state where the mounting 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. It can be arranged at an elevating operation position (see FIG. 1) C to be activated.

When loading / unloading work is performed by the retractable loading / unloading device 2 disposed at the storage position A as shown in FIG. 2, the mounting member 3 is moved from the front end to the rear end of the slide rail 12. Then, the retractable loading / unloading cradle lifting / lowering device 2 is arranged at the unfolded / folded position B shown in FIG.

Subsequently, at this position, the distal end member 51 of the folded loading tray 5 is rotated rearward to unfold the base end member 52 and the distal end member 51 so as to be on the same horizontal plane. Thereafter, the mounting member 3 is slid forward from the rear end of the slide rail 12 to be positioned at the lifting / lowering work position C shown in FIG. As a result, the loading platform 5 can be moved 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. Perform unloading work.

Next, when the loading / unloading operation of the luggage is completed and the retractable loading / unloading device 2 is stored, the retractable loading / unloading device 2 is arranged at the storage position A by an operation reverse to the above-mentioned operation. I do. That is, the retractable loading / unloading device 2 is temporarily placed at the unfolding / folding position B from the lifting / lowering operation position C, and at this position, the distal end side member 51 of the loading tray 5 is folded, and the mounting member 5 is folded. 3 to slide rail 1
2, the retractable loading tray elevating device 2 is slid from the rear end to the front end, and is disposed at the storage position A.

As described above, when the loading tray 5 is expanded or folded, the retractable loading tray elevating device 2 is deployed and folded at the position B.
In this position, the entire cargo receiving platform 5 is pulled out to the rear of the cargo platform 1 and the vehicle frame 11. Therefore, at this position, even if the cargo receiving platform 5 is expanded or folded, the cargo receiving platform 5 and the vehicle frame 11 are received. The table 5 does not interfere.

FIG. 5 shows another embodiment for protruding the top end edge of the upper surface of the base member 52 toward the front member 51 side. The same members as those described in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, a flat plate member 56 made of, for example, aluminum or the like is provided on the upper surface of the proximal member 52, and the distal end 56a projects from the upper edge of the upper surface of the proximal member 52 toward the distal member 51. The gap 56 is made as small as possible by this member 56.

FIG. 6 shows still another embodiment for protruding the upper end edge of the upper surface of the proximal member 52 toward the distal member 51 side. The same members as those described in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, the upper surface and the distal end surface of the base member 52 are integrally formed by extrusion molding of aluminum or the like, and the upper surface and the distal end edge of the base member 52 project toward the distal member 51 side. A projection 57 is formed, and the gap S is made as small as possible by the projection 57.

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 receiving table 5 up and down, the load receiving table 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.

[0040]

As described above, according to the retractable loading / unloading device of the present invention, the gap formed between the top edge of the base end member and the distal end member of the loading tray is small. As a result, the impact generated when the transport vehicle passes through the gap can be reduced to prevent collapse of the load due to the impact and also reduce the impact sound generated by the impact, It is possible to provide a retractable loading / unloading device that is highly safe.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a retractable loading tray elevating device is arranged at an elevating operation position.

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 device is arranged at a deployed / folded position.

FIG. 4 is an enlarged side view showing a structure of a connecting portion between a base end member and a distal end member in the loading tray.

FIG. 5 is an enlarged side view showing another embodiment of the connecting portion structure.

FIG. 6 is an enlarged side view showing still another embodiment of the connecting portion structure.

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

FIG. 8 is an enlarged side view showing a structure of a connecting portion between a base end member and a distal end member in a conventional receiving tray.

[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 51 distal member 52 proximal member 52a upper surface distal edge

Claims (1)

[Claims] A loading 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 at least forward and backward by a base member and a distal member. In a retractable loading / unloading device that is configured to be foldable and slidable to a storage position below the loading platform in a state where the loading platform is folded back and forth, a base end member in the loading platform The top end edge of the upper surface of the container is formed so as to protrude so as to reduce the gap formed between the upper end portion and the tip side member.