JPH0872601A - Load receiving table elevating device - Google Patents

Abstract

PURPOSE: To provide a load receiving table elevating device, which is simple in constitution, and by which a load receiving table can be stably elevated with goods loaded thereon, and also the load receiving table can be stably stored. CONSTITUTION: A load receiving table elevating device is so constructed that a slider 3 is provided in such a manner as to slide along posts 2 erected on both sides of the rear end of a load box 1, and a load receiving table 4 provided on the lower end of the slider 3 is freely elevated between the rising position substantially flush with the floor surface 1a of the load box 1 and the ground. In the above device, the load receiving table 4 is horizontally held on the lower end of the slider by a support device 5. The load receiving table is cantilever- supported in such a manner as to freely slide so as to be stored under the load box 1, and constructed like such a comb that slits are formed extending from the base end to the middle of the forward end part not to interfere with a frame 11 on which the load box 1 is placed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for elevating and lowering a receiving tray along which posts are provided upright on the left and right sides of the rear end of a luggage box.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 13, a loading tray elevating device of this type is configured such that a loading tray b can be stored under a rear portion of a luggage box a, and the loading tray b can be used during work.
To the rear of the packing box a and place it in the working position.
The cargo is loaded and unloaded by moving up and down along posts that are erected on the left and right sides of the rear end of the luggage box a between a raised position that is substantially flush with the floor surface a1 and the ground.

The load receiving base b is divided into three parts, and has a structure in which the base end is received by a supporting cross beam and the front end is welded to the cross member to be integrated. The base end portion is supported by the lift device, and the tip end portion is supported by the supporting wires c at four points.

[0004]

However, in the case where the load receiving base is supported at four points as in the above-mentioned conventional case, the load receiving base is supported horizontally when the load receiving base is lifted in order to horizontally hold the load receiving base. There is a problem that an adjustment mechanism for adjusting the length of the wire is required, the structure of the entire apparatus becomes complicated, and the weight is increased. Also, when there is tension in the supporting wire when pulling out the load receiving tray from the storage position to the working position, or vice versa, when this tension exists in the supporting wire, this tension acts as resistance to pulling out or pushing in. There was a problem of affecting the.

[0005]

SUMMARY OF THE INVENTION In the load receiving platform raising / lowering device of the present invention, sliders are slidably provided along posts standing upright on both sides of the rear end of the load box, and the slider is provided at the lower end of the slider. In a loading platform elevating device configured to be vertically movable between a lifting position where the loading platform is substantially flush with the floor surface of the packing box and the ground,
The load receiving base is horizontally held by the lower end of the slider by a supporting device, is slidably supported so that it can be stored under the load box, and interferes with the frame on which the load box is placed during storage. In order not to do so, it is configured in a comb shape with a slit formed from the base end to the middle of the tip.

[0006] The slit formed on the load receiving base is configured to be occludable by a occluding means.

The supporting device is provided with supporting rollers for supporting the upper and lower sides or the middle portion of both side edges of the load receiving base.

[0008]

The load receiving base is supported by the supporting device in a cantilever manner, and the load applied to the load receiving base is supported by the supporting device through the tip portion without the slit.

Further, by closing the slit formed on the load receiving base by the closing means, it is possible to prevent the caster and the foot of the worker from falling into the slit.

Further, the supporting rollers support the upper and lower sides or the intermediate portions of the both side edges of the load receiving base to smoothly store the load receiving base.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show an elevating / lowering device for a load receiving tray.

In this lifting and lowering device for a load receiving stand, sliders 3 are provided in posts 2 which are erected on both sides of a rear end of a load box 1 so as to be vertically movable along the posts 2. This is a vertical elevating system which elevates and lowers the load receiving base 4 supported by the lower end of the slider 3.

Rollers 31 are provided respectively at the upper end and the middle of the slider 3, and the rollers 3 roll in the post 2 so that the slider 3 can move smoothly in the post 2 in the vertical direction. it can.

The load receiving base 4 is supported by the slider 3 via a supporting device 5. As shown in FIGS. 3 and 4, the support device 5 is configured such that a bracket 32 fixed to the lower end of the slider 3 is pivotally supported above the rear end of the support member 51, and the upper surface of the front end of the support member 51 is a bracket. The stopper 33 is provided in contact with the stopper 33.

Rollers 52 are arranged in front of and behind the support member 51. These rollers 52 are rotatably fitted in the groove-shaped steels 41 arranged on both sides of the load receiving base 4, and the right and left 4 The load receiving table 4 is held horizontally by the individual rollers 52, and is slidably supported so as to be stored below the load box 1 as described later.

As shown in FIGS. 5 and 6, the load receiving base 4 has a frame on which the load box 1 is placed when the load box 1 is stored under the load box 1 (in the illustrated example, the frame is placed on the chassis frame 10 in the front-back direction). The vertical slits are arranged in the vertical direction, and will be referred to as the vertical slider 11 hereinafter.) Two slits 42 are formed in parallel to the left and right from the base end to the middle part of the front end. That is, the load receiving base 4 is formed in a comb shape having the tip portion 4a as a body portion.

As described above, the slit 42 is formed so that its width is slightly larger than the width of the vertical slat 11 so as to avoid interference with the vertical slat 11, and the length thereof is the length of the vertical slat 11. It is formed to fit the length of the packing box 1.

The load receiving base 4 having the slits 42 formed as described above has both edges so that the torsional and bending moments generated by the load applied to the load receiving base 4 are stably supported by the supporting device 5. In addition to being composed of the groove-shaped steel 41, a plurality of reinforcing members 43 are provided. For example, the torsion moment and bending moment generated by the load applied to the X portion shown in FIG. It can be supported by the device 5.

Since it is dangerous for the slit 42 to drop casters or a worker's foot into the slit 42, when working, as shown in FIG. Means) 6 are arranged. The square bar 6 is made of, for example, wood, plastic, aluminum or the like, and is placed on the locking pieces 44 fixedly provided on both sides of the slit 42 in consideration of the width L of the vertical underlay 11, so that the upper surface of the square bar 6 receives the load. It is formed to be substantially flush with the upper surface of the table 4.

If the strength allows, the square bar 6 may be a thin plate as shown by a chain line in FIG. In this case, the locking piece 44 is provided above the slit 42 so that the upper surface of the thin plate is substantially flush with the upper surface of the load receiving base 4.

As shown in FIG. 1, the tip of a rod 701 (711) of a hydraulic cylinder 70 (71) arranged substantially parallel to the post 2 is connected to the lower end of the slider 3. The left and right hydraulic cylinders 70 (71) are configured to expand and contract in synchronization with each other by the hydraulic circuit shown in FIG.

In FIG. 8, P is a hydraulic pump driven by a motor M, and the discharge side of the hydraulic pump P is connected to a rod side chamber 70b of the hydraulic cylinder 70 and a piston side chamber 71a of the hydraulic cylinder 71 via oil passages 72 and 73. Are in communication.

The piston side chamber 70 of the hydraulic cylinder 70
A is communicated with the rod side chamber 71b of the hydraulic cylinder 71 by a communication passage 74.

Here, in the hydraulic cylinder 70 and the hydraulic cylinder 71, the piston side pressure receiving area of the hydraulic cylinder 70 and the rod side pressure receiving area of the hydraulic cylinder 71 are set to be the same.

As a result, the rod 70 of the hydraulic cylinder 70 is
1 is extended by an amount corresponding to the oil discharged from the rod side chamber 71b of the hydraulic cylinder 71.

At this time, as described above, the hydraulic cylinder 71
Since the rod side pressure receiving area of the hydraulic cylinder 70 and the piston side pressure receiving area of the hydraulic cylinder 70 are the same, and the oil discharged from the rod side chamber 71b of the hydraulic cylinder 71 is supplied to the piston side chamber 70a of the hydraulic cylinder 70, the hydraulic cylinder 71
When the rod 711 of A is stroked by ΔS, the rod 701 of the hydraulic cylinder 70 also makes a ΔS stroke in synchronization with this.

Reference numeral 75 in FIG. 8 is a check valve provided in the oil passage 72. This check valve 75 is a pilot check valve for guiding pilot pressure from the communication passage 74, and When the pilot pressure becomes negative, the oil passage 72 is cut off. Also, 7
6 is a switching valve equipped with a check valve, 77 is a check valve, 7
Reference numeral 8 is a sudden drop prevention valve, and 79 is a relief valve.

Next, the operation of the load receiving platform elevating / lowering device thus constructed will be described.

First, when storing the load receiving tray 4, the load receiving tray 4 is placed at a height position where it can be stored, and the load receiving tray 4 is pushed under the load box 1 so that the load receiving tray 4 is supported by the supporting device 5. While being supported by the roller 52, the storage box 1 is stored in the lower rear portion of the luggage box 1 as shown by a two-dot chain line in FIG. At this time, since the slit 42 is formed in the cargo receiving table 4, the slit 42
Thus, it is stored while avoiding the vertical thread 11.

When loading and unloading cargo between the cargo box and the ground, the cargo cradle 4 is pulled out from the above-mentioned stored state to the rear working position, and the hydraulic cylinders 70 and 71 are synchronized to expand and contract. When operated, the load receiving base 4 can be moved up and down between the ascending position substantially flush with the floor surface 1a of the load box 1 and the ground while the support device 5 maintains the horizontal state.

By constructing the load receiving base 4 as described above and supporting the load receiving base 4 by the supporting device 5,
It is possible to support the base end portion in a cantilever manner without supporting the distal end portion of the load receiving base 4 with a wire as in the conventional case, and moreover, the load receiving base 4 can be stably moved up and down while a load is loaded and stored. The operation can be performed stably.

9 and 10 show another embodiment of the supporting device.

This support device 8 has rollers 82 and 83 provided in front of and behind a bracket 81 fixed to the lower end of the slider 3 so that the front rollers 82 support the upper surfaces of both side edges of the load receiving base 4 and the rear rollers. 83 supports the lower surfaces of both side edges of the cargo receiving table 4. As a result, the load receiving table 4 is held horizontally and slidably supported below the rear portion of the load box 1 so that it can be stored.

The support device 8 is not limited to one supported by rollers, but may be a slide member such as a slide pad.

Further, the closing means for closing the slit 42 is not limited to the square member 6, but the upper surface of the slit 42 may be closed by the plate member 91 as shown in FIG.

In this closing means, one side of the plate member 91 is rotatably provided at one side edge of the slit 42 by a hinge 92,
The plate-shaped body 91 is arranged at the position shown by the chain double-dashed line when the loading tray 4 is stored, and the slit 42 is opened.
By disposing 1 over the upper surface of the slit 42, the slit 42 is closed.

Further, as shown in FIG. 12, the closing means rotatably supports a pair of left and right receiving members 93 formed like hooks at the lower end portions of both side edges of the slit 42 by hinges 94, and holds the pair of receiving members 93 at the time of storage. Left and right support members 9 as indicated by the dotted line
3 are respectively rotated upward to be arranged on both left and right side edges of the slit 42 to open the slit 42, and at the time of work, the middle portions of the left and right receiving members 93 are abutted and arranged, so that the left and right receiving members 93a. A fulcrum surface may be formed at the center of the slit 42 by the tip of the.

[0039]

As described above, according to the present invention, the load receiving base is supported by the supporting device in a cantilever manner, and the load applied to the load receiving base is supported by the supporting device via the tip portion having no slit. , The structure is simplified without supporting the tip portion of the load receiving tray with a wire as in the conventional case, and the load receiving tray can be stably moved up and down while a load is loaded, and the load receiving tray can also be stored. It can be performed stably.

Further, by closing the slit formed on the load receiving base by the closing means, it is possible to prevent the caster and the foot of the worker from falling into the slit, and the work can be performed safely.

Further, the supporting rollers support the upper and lower sides or the intermediate portions of both side edges of the load receiving table, so that the load receiving table can be stored smoothly.

[Brief description of drawings]

FIG. 1 is a side view of a notch showing a configuration of a load receiving platform raising / lowering device according to the present invention.

FIG. 2 is a front view showing the configuration of the load receiving platform raising / lowering device according to the present invention.

FIG. 3 is an enlarged side view showing a supporting device.

FIG. 4 is an enlarged front view showing a supporting device.

FIG. 5 is a plan view showing a cargo tray.

6 is a view on arrow A in FIG.

FIG. 7 is a view showing a closing means.

FIG. 8 is a circuit diagram for synchronizing left and right hydraulic cylinders.

FIG. 9 is a side view showing another embodiment of the supporting device.

FIG. 10 is a front view showing another embodiment of the supporting device.

FIG. 11 is a view showing another embodiment of the closing means.

FIG. 12 is a view showing another embodiment of the closing means.

FIG. 13 is a side view showing a conventional load receiving platform raising / lowering device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Packing box 1a Floor surface 11 Vertical sled (frame) 2 Post 3 Slider 4 Cargo stand 42 Slit 5 Supporting device 52 Supporting roller 6 Closing means

Claims (3)

[Claims] 1. A slider is slidably provided along posts erected on both sides of a rear end of the luggage box, and a load receiving table provided at a lower end of the slider is substantially flush with a floor surface of the luggage box. In the load receiving platform elevating device configured to be able to move up and down between the ascending position and the ground, the load receiving base is horizontally held at the lower end of the slider by a supporting device and is stored below the load box. An apparatus for lifting and lowering a loading platform, which is slidably supported in a cantilever manner and has a comb-like shape with a slit formed from a base end to a middle portion of a tip end thereof so as not to interfere with a frame on which a loading box is placed during storage. . 2. The load receiving platform elevating / lowering device according to claim 1, wherein the slit formed in the load receiving platform is configured to be closed by a closing means. 3. The load receiving platform elevating device according to claim 1, wherein the support device includes support rollers for supporting the upper and lower sides or the intermediate portions of both side edges of the load receiving platform.