JP2718604B2 - Loading platform lifting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading / unloading device for lifting / lowering a loading / unloading pallet so as to unload cargo and to store it compactly when not in use.

[0002]

2. Description of the Related Art In general, a loading tray elevating device is provided with upper and lower links so as to have a parallel link mechanism on a vehicle body below the loading tray, and a loading tray is provided horizontally at the end of the upper and lower links. Is rotated to raise and lower the receiving table. By the way, when the receiving platform is not used,
As disclosed in Japanese Unexamined Patent Publication No. 3-46243, a loading table is raised and stored behind a rear door of the loading table.

[0003] Therefore, a platform having the same height as the packing box is used.
There is a problem that when loading and unloading cargo from a store, the stored receiving tray is in the way and the rear door cannot be opened. Therefore, in order to solve the above-mentioned problems, Japanese Utility Model Laid-Open No. 57-14
As disclosed in Japanese Patent No. 7136, the loading tray is lowered, the loading tray is folded and turned, and in this state, the upper and lower links are rotated upward to store the loading tray below the loading tray. ing.

[0004]

However, in the above structure, the upper and lower links are located on the left and right, but the receiving tray has the same width as the loading platform, so that a large storage space is secured below the loading platform. Because of necessity, it is necessary to cut out various reinforcing girders of the vehicle body and the luggage carrier located in the storage space, and when the existing vehicle is provided, a significant modification is required.

[0005] Further, since the car body or the like is notched, there is a disadvantage that the strength of the cargo bed is reduced and heavy goods cannot be loaded. SUMMARY OF THE INVENTION An object of the present invention is to provide a loading tray lifting device capable of storing the loading tray compactly with almost no modification of the vehicle body or the loading platform.

[0006]

According to a first aspect of the present invention, there is provided a pair of left and right mounting members rotatably provided on a vehicle body or a bed under a bed, and provided on the vehicle body or a bed for rotating the mounting members. A storage cylinder, and upper and lower links that form a parallel link mechanism by pivotally supporting the base to a part of the mounting member distant from the center of rotation of the mounting member and pivotally supporting the tip to the mounting post. An elevating cylinder provided on a mounting member for rotating at least one of the upper and lower links, and being held horizontally by being supported by the mounting column and being stored below the vehicle body by the rotation of the mounting member. When the storage cylinder can be extended and the storage cylinder is fully extended,
Is detected by a detection switch, and the control device is configured to extend and retract the elevating cylinder by detection of the detection switch.

According to a second aspect of the present invention, a pair of left and right mounting members rotatably provided on the vehicle body or the bed below the bed, a storage cylinder provided on the vehicle body or the bed for rotating the mounting member, and a base, Upper and lower links that pivotally support a part of the mounting member that is separated from the center of rotation of the mounting member and form a parallel link mechanism by pivotally supporting the front end of the mounting member with a mounting post.
An elevating cylinder provided on a mounting member for rotating at least one of the upper and lower links, and supported horizontally by being supported by the mounting column, and retractable below the vehicle body by rotating the mounting member. And a control device for activating the timer when the storage cylinder is started and for operating the elevating cylinder after a lapse of a predetermined time when the storage cradle is stored.

[0008]

When loading / unloading the load, the lifting cylinder is operated to rotate the upper / lower link up and down, and the load receiving table is raised / lowered in a horizontal state to load / unload the load. In the case of storing the loading tray, in claim 1, the loading tray is raised and lowered to the intermediate position, and then the loading tray is raised and fixed, and the mounting member is rotated by the storage cylinder. When the rotation of the mounting member is completed, the limit switch detects, and the detection of the limit switch activates the elevating cylinder to rotate the upper and lower links, thereby raising and retracting the load receiving table to a position close to the vehicle body.

According to the second aspect, the loading table is raised and lowered to the intermediate position, and then the loading table is raised and fixed, and the mounting member is rotated by the storage cylinder. The timer starts with the operation of the storage cylinder, and after a certain time elapses, that is, after the mounting member is rotated, the elevating cylinder operates to rotate the upper and lower links,
The receiving stand is raised and stored to a position close to the vehicle body.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Reference numeral 1 denotes a packing box mounted on a vehicle body 2. The packing box 1 has a carrier 3 and a rear door 4.
And an auxiliary girder 6. The vehicle body 2 may be composed of either a chassis frame and a subframe or a chassis frame only.

A pair of left and right support bearings 7 are provided below the rear end of the vehicle body 2, and the support bearings 7 rotatably support a pipe-shaped support member 8 extending in the left-right direction. An arm 9 is fixed in the middle of the support member 8, and the arm 9 and the vehicle body 2 are fixed.
Between the storage cylinder 10 and the storage cylinder 1
The support member 8 is rotated by the expansion and contraction of zero.

Incidentally, the storage cylinder 10 can be provided on the carrier 3. A pair of mounting members 11 are fixed to the left and right ends of the support member 8 on the left and right sides. The mounting member 11 has a flat plate shape and forms a triangle, and a support member 8 is fixed to one corner.

Upper and lower links 12 and 13 are arranged vertically in parallel. The bases of the links 12 and 13 are located at the other corner of the outermost wall of the support member 11, that is, in front of one corner (left side in FIG. 1). It is supported at the upper and lower corners respectively. At the leading ends of the two links 12 and 13, vertical mounting supports 14 having an L-shaped cross section are pivotally supported, respectively.
2 and 13 form a parallel link mechanism.

A base of a loading table 15 is pivotally supported at a lower portion of the mounting column 14, and the loading table 15 is held horizontally by a bending link 16 provided between the mounting column 14 and the loading table 15. Has become. The receiving table 15 comprises a receiving table main body 17 and an auxiliary table 18 which is hinged to the tip of the receiving table main body 17 and can be folded on the receiving table main body 17.

When the refraction link 16 is folded and the load receiving table 15 is rotated upward, a pin 20 on the side surface of the load receiving table 15 is fixed by a fixing member 19 at the upper end of the mounting column 14. Reference numeral 21 denotes an elevating cylinder for rotating the upper link 12, and the elevating cylinder 21 is a set of mounting members 11
And an integral link to the upper link 12
The two links 12 and 13 are provided between the arm 22 and the mounting member 11, and the two links 12 and 13 are vertically rotated by expansion and contraction of the lifting cylinder 21.

Reference numeral 23 denotes a bracket provided on the mounting member 11. The bracket 23 has a first limit switch LS1.
To detect that the elevating cylinder 21 has expanded and contracted to an intermediate position. Reference numeral 24 denotes a bracket fixed to the vehicle body 2, and a second limit switch LS2 is attached to the bracket 24 so as to detect that the storage cylinder 10 is fully extended.

Reference numeral 25 denotes a control device for controlling the lifting and lowering and storing of the loading tray 15. The control device 25 comprises a hydraulic circuit 26 and an electric circuit 27. As shown in FIG. 7, the hydraulic circuit 26 is communicated from a pump 28 driven by a motor M to a lifting / lowering cylinder 21 via a lifting / lowering switching valve 29, and is connected to the lifting / lowering switching valve 29 and the lifting / lowering cylinder 21. A rod-side flow path 30 communicating with the rod side of the lifting / lowering cylinder 21 and a bottom-side flow path 31 communicating with the bottom side are provided therebetween.

The two flow passages 30 and 31 are provided with safety valves 34 and 35 which can be switched between a check portion 32 permitting the flow only to the lifting cylinder 21 and a fully open portion 33, and a rod-side safety valve 34 is provided. The fifth solenoid SOL5 can be switched to the fully open portion 33 side, and the bottom safety valve 35 can be switched to the fully open portion 33 side by the sixth solenoid SOL6.

When the first solenoid SOL1 and the fifth solenoid SOL5 of the up / down switching valve 29 are energized by the above-described circuit, the up / down cylinder 21 is extended. The lifting cylinder 21 is reduced. Return oil from the lift switching valve 29 is stored in the storage switching valve 3.
6 from the storage switching valve 36 to the storage cylinder 1
0 is supplied.

The storage switching valve 36 and the storage cylinder 1
0, the rod-side flow path 37 communicating with the rod side of the storage cylinder 10 and the bottom-side flow path 3 communicating with the bottom side.
8 are provided. The two flow paths 37 and 38 are provided with safety valves 39 and 40, respectively, similarly to the flow paths 30 and 31 of the lifting / lowering cylinder 21, and the rod-side safety valve 39 is provided.
Can be switched by a seventh solenoid SOL7, and the safety valve 40 on the bottom side can be switched by an eighth solenoid SOL8.

When the third solenoid SOL3 and the seventh solenoid SOL7 of the storage switching valve 36 are energized by the above circuit, the storage cylinder 10 is extended, and when the fourth solenoid SOL4 and the eighth solenoid SOL8 of the storage switching valve 36 are energized. The storage cylinder 10 is reduced. As shown in FIG. 8, the electric circuit 27 branches a lifting circuit 43 and a rotation circuit 44 from a main circuit 42 having a main switch 41.

The elevating circuit 43 raises and lowers the loading table 15, and can be switched to an ascending circuit 46 or a descending circuit 47 by an elevating switch 45. The ascending circuit 46 includes a first solenoid SOL1 and a fifth solenoid SO.
L5 is provided in parallel, and the descending circuit 47 is provided with a second solenoid SOL2 and a sixth solenoid SOL6 in parallel.

The rotation circuit 44 rotates the mounting member 11, and can be switched to an extension circuit 49 or a storage circuit 50 by a rotation switch 48. The overhang circuit 49 is provided with a fourth solenoid SOL4 and an eighth solenoid SOL8 in parallel, and the storage circuit 50 is provided with a third solenoid SOL3 and a seventh solenoid SOL7 in parallel.

The ascending circuit 46, the descending circuit 47, the overhang circuit 49, and the storage circuit 50 are connected to a drive circuit 51 provided with a motor M, respectively.
9 is connected to the ascending circuit 46 by the overhang auxiliary circuit 52,
The storage circuit 50 is connected to the descending circuit 47 by a storage auxiliary circuit 53. The overhang circuit 49 includes a normally open contact LS1a of the first limit switch LS1 and an overhang auxiliary circuit 5.
2 includes a normally closed contact LS1b of the first limit switch LS1.
Are interposed respectively.

The storage circuit 50 is provided with a second limit switch LS2, and the storage auxiliary circuit 53 is provided with a normally open contact LS2a. FIG. 9 shows an electric circuit 27 'of another embodiment, in which the electric circuit 27 of FIG. 8 is partially used. Mounted timer circuit 54
And an extension circuit 49 'and a storage auxiliary circuit 5 instead of the respective contacts of the limit switches LS1, LS2.
The normally open contact Ta of the timer T is connected to the extension auxiliary circuit 5 at 3 '.
The normally closed contact Tb of the timer T is interposed in 2 ′ and the storage circuit 50 ′.

When the rotary switch 48 is switched to the storage circuit 50 'by the circuit 27', the timer T is energized and the third solenoid SOL3 and the seventh solenoid SOL7 are turned on.
Then, the storage cylinder 10 is extended by energizing for a predetermined time (about 4 seconds), and the mounting member 11 is rotated clockwise in FIG. After a lapse of a predetermined time, the normally closed contact Tb becomes “disconnected” and the normally open contact Ta becomes “closed”, so that the second solenoid SOL2 and the sixth solenoid SOL6 are energized to reduce the elevating cylinder 21 and the load receiving table 15 2 and the storage state is established.

The rotation switch 48 is extended to an overhang circuit 49 '.
When the timer is switched to, the timer T is energized, and the first solenoid SOL1 and the fifth solenoid SOL5 are energized for a certain period of time through the overhang auxiliary circuit 52 ', thereby raising and lowering the cylinder 21.
Is extended, and the receiving platform 15 is separated from the vehicle body 2. After a lapse of a predetermined time, the normally closed contact Tb becomes “disconnected” and the normally open contact Ta
Becomes “contact”, and energizes the fourth solenoid SOL4 and the eighth solenoid SOL8 to reduce the storage cylinder 10,
The mounting member 11 is rotated counterclockwise in FIG.

The fixed time is set to be equal to or longer than the rotation time of the mounting member and the time of extension of the lifting cylinder. The operation of the present invention will now be described with reference to FIG. 1. In the case of carrying out unloading work, the main switch 41 is set to "ON" in the state of the dashed line in FIG. Switch to 47 side.

When the motor M is operated by energizing the descending circuit 47, the second solenoid SOL2 and the sixth solenoid SOL6 are excited, the up-and-down cylinder 21 is reduced, and the loading table 15 is moved from the position of the dashed line to the position of the solid line in FIG. Descends. At this time, since the second limit switch LS2 is not detected, the storage auxiliary circuit 53 is not energized.

The luggage on the ground is placed on the receiving tray 15 in the state of the solid line in FIG. 1, and the lift switch 45 is switched to the lift circuit 46 side. The motor M operates by energizing the ascending circuit 46, and the first solenoid SOL1 and the fifth solenoid SO
When L5 is excited, the lifting cylinder 21 is extended, and the loading table 15 is raised to the position indicated by the alternate long and short dash line in FIG.

In this state, the load on the loading tray 15 is moved to the loading tray 3. At this time, any one of the contacts LS1a and LS1b of the first limit switch LS1 is "disconnected", so that the overhang circuit 49 is not energized. Next, when the loading tray is stored, the loading tray 15 is first erected at a solid line position as shown in FIG.

In this state, the rotation switch 48 is connected to the storage circuit 5.
Switch to 0 side. When the storage circuit 50 is energized, the motor M
Operates, and since the second limit switch LS2 does not detect, the third solenoid SOL3 and the seventh solenoid SOL7 are excited, the storage cylinder 10 is extended, and the mounting member 11 is rotated to FIG.

When the mounting member 11 reaches the position shown in FIG. 5, the arm 9 comes into contact with the second limit switch LS2, and the second limit switch LS2 detects it. Second limit switch L
Upon detection of S2, the excitation of the third solenoid SOL3 and the seventh solenoid SOL7 is released, the storage auxiliary circuit 53 is energized, and the second solenoid SOL2 and the sixth solenoid SOL6 are excited.

When the second solenoid SOL2 and the sixth solenoid SOL6 are excited, the lifting cylinder 21 contracts,
The loading tray 15 is stored below the vehicle body 2 as shown in FIG. To extend the loading tray, the rotary switch 48 is switched to the extension circuit 49 from the state shown in FIG.

Since the motor M operates and the first limit switch LS1 does not detect by energizing the overhang circuit 49, the fourth solenoid SOL4 and the eighth solenoid SOL8 are not energized and are energized to the overhang auxiliary circuit 52. I do. First solenoid SOL1 and fifth solenoid SO
When L5 is excited, the lifting cylinder 21 is extended, and the lifting table 15 is moved to the position shown in FIG.

When the lift 15 reaches the position shown in FIG. 5, the first limit switch LS1 detects the position and the first solenoid SOL.
Excitation to the first and fifth solenoids SOL5 is released, and the fourth solenoid SOL4 and the eighth solenoid SOL
L8 is excited. By energizing the fourth solenoid SOL4 and the eighth solenoid SOL8, the storage cylinder 10
Is reduced to rotate the mounting member 11 counterclockwise to the state shown in FIG.

The loading / unloading work can be started by releasing the securing member 19 from the state shown in FIG.

[0038]

As described above, according to the present invention, an upper / lower link is provided on a mounting member rotatably supported on a vehicle body or the like, a load receiving table is provided on a front side of the upper / lower link, and the mounting member is provided on the mounting member. The loading table is raised and lowered by the lifting cylinder, and the mounting member is rotated by the storage cylinder provided on the vehicle body so that the loading table can be moved to the front side of the vehicle body. Since it can be stored under the car body, there is no need to cut out the reinforcing girder of the car body and the carrier as in the conventional case, and it can be easily and easily provided on existing vehicles without lowering the strength of the carrier. .

Further, since the lifting cylinder and the storage cylinder can be automatically operated in sequence when the loading tray is stored or extended, individual operation of each cylinder is not required, and the loading and unloading of the loading tray is simplified. It can be performed quickly.

[Brief description of the drawings]

FIG. 1 is an overall view of the present invention.

FIG. 2 is an AA diagram of FIG.

FIG. 3 is an enlarged cross-sectional view taken along the line BB of FIG. 2;

FIG. 4 is an operation initial state diagram when the loading tray is stored.

FIG. 5 is an operation intermediate state diagram when the loading tray is stored.

FIG. 6 is an operation final state diagram when the loading tray is stored.

FIG. 7 is a hydraulic circuit diagram.

FIG. 8 is an electric circuit diagram.

FIG. 9 is an electric circuit diagram of another embodiment.

[Explanation of symbols]

 2 Body 3 Carrier 10 Storage cylinder 11 Mounting member 12 Upper link 13 Lower link 14 Mounting column 15 Loading table 21 Elevating cylinder 25 Controller LS1 First limit switch LS2 Second limit switch T Timer

Claims (2)

(57) [Claims] 1. A pair of left and right mounting members rotatably provided on a vehicle body or a bed under a bed, and a storage cylinder provided on the vehicle body or a bed for rotating the mounting members.
An upper / lower link for pivotally supporting the base to a part of the mounting member remote from the center of rotation of the mounting member and for pivotally supporting the front end to the mounting column to form a parallel link mechanism; A lifting cylinder provided on a mounting member for rotating at least one of the above, a load receiving table that is supported horizontally by being supported by the mounting column, and that can be stored below the vehicle body by rotating the mounting member; And a control unit for detecting the maximum extension of the storage cylinder by the detection switch when the storage tray is stored, and extending and retracting the lifting cylinder by detecting the detection switch. A pair of left and right mounting members rotatably provided on the vehicle body or the bed below the bed, a storage cylinder provided on the vehicle body or the bed for rotating the mounting members, and a base, Upper and lower links that pivotally support a part of the mounting member that is distant from the center of rotation of the member and that pivotally support the front end of the mounting member to form a parallel link mechanism;
An elevating cylinder provided on a mounting member for rotating at least one of the lower links, and a loading table which is supported horizontally by the mounting column and can be stored below the vehicle body by rotating the mounting member. And a control device for activating the timer at the same time as the operation of the storage cylinder at the time of storage of the loading tray, and for operating the lifting cylinder after a predetermined time has elapsed.