JP2002145600A - Forklift - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forklift capable of simply positioning a replacement battery at a mounting position. SOLUTION: This forklift 10 is provided with oscillating means 20 capable of swinging forks 15 in the lateral direction and shifting means 30 capable of sliding the forks 15 in the lateral direction. The forklift 10 is provided with an oscillation free hydraulic circuit 50 capable of switching oscillating cylinders 27 for operating the oscillating means 20 to a free state and a shift free hydraulic circuit 55 capable of switching shifting cylinders 32 for operating the shifting means 30 to a free state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forklift, and more particularly, to a forklift having a swinging means capable of swinging a fork in the left-right direction or a shifting means capable of sliding in the left-right direction.

[0002]

2. Description of the Related Art In order to operate a forklift continuously for a long time, if the frequency of battery replacement of the forklift is high, the forklift is generally used for battery replacement. For this reason, a pair of insertion holes for inserting a fork of a forklift are formed in the bottom of the battery. Insert the fork of the replacement forklift into these insertion holes and remove the battery from the forklift.

[0003] Then, as shown in FIG.
After removing the battery from 80, insert the fork 83 of the replacement forklift 82 into the insertion hole 85 of the new battery 84, and replace the new battery 84 with the replacement forklift 82.
Loading position of forklift 80 transported by fork 83
Load on 81.

[0004]

At this time, while the worker runs the forklift 82 for replacement,
Adjust the position of 83 and forklift a new battery 84
It is difficult to align with 80 loading positions 81. Therefore, it is necessary to repeat the positioning of the new battery 84 a plurality of times, and there is a problem that the replacement of the new battery 84 cannot be easily performed.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a forklift capable of easily positioning a replacement battery at a loading position.

[0006]

In order to achieve the above-mentioned object, according to the present invention, there is provided a swinging means for swinging a fork in a lateral direction, and a fork for swinging a fork in a lateral direction. In a forklift having a shift means slidable, a swing free hydraulic circuit capable of freely switching a swing actuator for operating the swing means is provided, and a shift actuator for operating the shift means is provided. A shift-free hydraulic circuit that can be switched freely is provided.

[0007] Here, the lateral swing means swinging the fork in the left-right direction or the front-rear direction when viewed from the worker riding the forklift. The lateral sliding means the work on the forklift. Means moving the fork in the left-right direction or the front-back direction as viewed from the user. The swing actuator corresponds to a hydraulic cylinder or a hydraulic motor, and the shift actuator corresponds to a hydraulic cylinder.

In the forklift constructed as described above, the swing actuator can be freely switched by providing the swing free hydraulic circuit. In addition, the shift actuator can be freely switched by providing the shift-free hydraulic circuit.

For this reason, when the battery mounted on the fork is placed at the mounting location, when the battery comes into contact with the guide frame at the mounting location, a force is applied to the battery from the guide frame, causing the fork to swing or slide laterally. . Thereby, the battery is guided by the guide frame and accurately positioned at the loading position.

Further, according to the present invention, in a forklift having a swinging means capable of swinging a fork in a lateral direction, a swinging actuator for operating the swinging means is freely switched. A possible swing-free hydraulic circuit is provided.

In the forklift constructed as described above, the swing actuator can be switched freely by providing the swing free hydraulic circuit. For this reason, when the battery mounted on the fork is placed at the mounting location, when the battery comes into contact with the guide frame at the mounting location, force is applied to the battery from the guide frame, and the fork swings laterally. Thereby, the battery is guided by the guide frame and accurately positioned at the loading position.

Further, according to the present invention, in a forklift having shift means capable of laterally sliding a fork, a shift actuator for operating the shift means can be freely switched. It is characterized by having a free hydraulic circuit.

In the forklift constructed as described above, the shift actuator can be switched freely by providing the shift-free hydraulic circuit. For this reason, when the battery mounted on the fork is placed at the mounting location and the battery contacts the guide frame at the mounting location, a force is applied to the battery from the guide frame and the fork is slid in the lateral direction. Thereby, the battery is guided by the guide frame and accurately positioned at the loading position. Therefore,
The battery can be easily placed in the loading position without any trouble.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, a forklift 10 according to the first embodiment has a mast 12 attached to a vehicle body 11, a lift bracket 13 attached to the mast 12 so as to be able to move up and down, and a forklift
An industrial vehicle that raises and lowers 15
A swing means 20 capable of swinging in the lateral direction is provided, and a shifting means 30 slidable in the transverse direction is provided on the swing means 20.
The shift means 30 is provided with a fork 15.

As shown in FIG. 2, the swinging means 20 has a base 22 attached to the lift bracket 13 via a support member 21, and is swingable in a lateral direction (left and right direction) via a pin 24 on the base 22. A swing part 26 is attached, a cylinder body 28 of a swing actuator (swing cylinder) 27 is attached to the base 22, and a cylinder rod 29 (see FIG. 3) of the swing cylinder 27 is attached to the swing part 26. I have.

Therefore, as shown in FIG.
By protruding and retracting the cylinder rod 29 from the cylinder body 28 of 27, the swing part 26 swings about the pin 24 in the lateral direction (left-right direction). Thereby, the shift means 30 and the pair of forks 15 swing in the left-right direction (the direction of the arrow).

As shown in FIG. 2, the shift means 30 has upper and lower hooks 31A and 31B slidably engaged with upper and lower rails 26A and 26B of a swing part 26 of the swing means 20, respectively.
Left and right hooks 31A and 31B are provided in the shift portion 31, and FIG.
As shown in FIG. 7, the cylinder body 33 of the shift actuator (shift cylinder) 32 is attached to the swing part 26, and the left and right cylinder rods 34 of the shift cylinder 32 are attached to the shift part 31. In addition, as shown in FIG. 4, the shift means 30 has a pair of forks 15 attached to the shift portion 31 at predetermined intervals (see also FIG. 2).

Therefore, the right and left cylinder rods 34 are protruded and retracted from the cylinder body 33 of the shift cylinder 32 shown in FIG.
31B slides in the lateral direction (left and right direction) along the rails 26A and 26B of the swing part 26. This causes the pair of forks 15 to slide in the left-right direction (the direction of the arrow) together with the shift portion 31, as shown in FIG.

Next, the hydraulic circuit of the forklift 10 is shown in FIG.
This will be described with reference to FIG. The hydraulic circuit 40 includes a lift control valve 43 for operating a lift cylinder 42 and a tilt control valve for operating two tilt cylinders 44.
45, a swing control valve 46 for operating the swing cylinder 27, a shift control valve 47 for operating the shift cylinder 32, a swing free hydraulic circuit 50 that can freely switch the swing cylinder 27, and a free switch for the shift cylinder 32 A possible shift-free hydraulic circuit 55 is provided.

The hydraulic circuit 40 includes a motor 60 and a hydraulic pump
By driving 61, the oil in the tank 62 flows to each control valve 43, 45, 46, 48, and by controlling the flow of oil with each control valve 43, 45, 46, 48, each cylinder 27, Operate 32, 41, 44.

For example, by operating the lift control valve 43 with the lift operation lever 65, the lift cylinder 41 is operated to move the fork 15 (see FIG. 1) up and down in the direction of arrow A (see FIG. 1), and the tilt control valve is moved. By operating the tilt operation lever 66, the two tilt cylinders 44 are operated to move the fork 15 in the direction of arrow B (see FIG. 1).
(See).

Further, by operating the swing control valve 46 with the swing operating lever 67, the swing cylinder 27 is operated to swing the fork 15 in the lateral (left and right) direction, and the shift control valve 47 is shifted by the shift operating lever. 68
, The shift cylinder 32 is operated to slide the fork 15 in the lateral (left / right) direction.

In addition, a free switching button 69 shown in FIG.
By pressing the switch, the switching valve 51 of the swing free hydraulic circuit 50 and the switching valve 56 of the shift free hydraulic circuit 55 are connected as shown in FIG.
From the state of FIG. 7 to the state of FIG. Thus, the head-side flow path 52 of the swing cylinder 27 and the rod-side flow path 53 communicate with each other, and the swing cylinder 27 can be switched freely. Further, the shift cylinder 32 can be switched freely by connecting the one flow path 57 of the shift cylinder 32 and the other flow path 58.

Next, an example in which the forklift 10 loads the battery 71 on another forklift 70 will be described with reference to FIG. A guide frame 73 for setting the battery 71 in the loading position 72 is provided around the battery loading position 72 of the forklift 70. Forklift shown in FIG.
Insert the fork 15 of 10 into the insertion hole 74 of the battery 71,
The battery 71 is transported to a position above the loading position 72 of the forklift 70.

Next, by pressing the free switching button 69 shown in FIG. 8, the swing free hydraulic circuit 50 and the shift free hydraulic circuit 55 are switched to the state shown in FIG. Cylinder
Switch 32 to free. In this state, the fork 15 is lowered by operating the lift operation lever 65 shown in FIG. 8, and the battery 71 is lowered together with the fork 15.

The lowered battery 71 comes into contact with each guide frame 73 provided around the battery loading position 72. Therefore, force is applied to the battery 71 from the guide frame 73,
Swing or slide 15 in the horizontal (left / right) direction. Thus, the battery 71 is guided by the guide frame 73 and is accurately positioned at the loading position 72. Therefore, the battery 71 can be easily placed at the loading position 72 without any trouble.

Next, a second embodiment will be described with reference to FIG. The swing free hydraulic circuit 75 is provided with a switching valve 76A for connecting the head side flow path 52 to the tank 62 and a switching valve 76B for connecting the rod side flow path 53 to the tank 62. The shift-free hydraulic circuit 78 is also provided with a switching valve 79A for connecting the flow path 57 on one side to the tank 62 and a switching valve 79B for connecting the flow path 58 on the other side to the tank 62.

The swing free hydraulic circuit 75 includes a switching valve 76.
A and the switching valve 76B are normally in a blocked state, and the head-side flow path 52 and the rod-side flow path 53 of the swing cylinder 27 are kept separated from the tank 62. In the shift-free hydraulic circuit 78, the switching valve 79A and the switching valve 79B are normally in a blocked state, and the flow path 57 on one side and the flow path 58 on the other side of the shift cylinder 32 are provided.
Is kept separated from the tank 62.

Then, the free switching button 69 shown in FIG.
By pressing, the state is switched to the state shown in FIG. Accordingly, the head-side flow path 52 and the rod-side flow path 53 of the swing cylinder 27 are communicated with the tank 62, and the swing cylinder 27 can be switched freely. Further, the flow path 57 on one side of the shift cylinder 32 and the flow path 58 on the other side
And the shift cylinder 32 can be switched freely. Therefore, the same effects as in the first embodiment can be obtained.

The forklift 10 of the present invention is not limited to the embodiment described above, but can be appropriately modified and improved. For example, an example has been described in which the oscillating means 20 is provided with an oscillating cylinder 27 and the fork 15 is swung in the left-right direction by operating the oscillating cylinder 27, but a oscillating motor is used instead of the oscillating cylinder 27. It is also possible. Further, the example in which the battery is replaced by the forklift 10 has been described, but the same effect can be obtained by applying this forklift 10 to other works.

In addition, the materials of the swing means, shift means, etc. of the forklift illustrated in the above-described embodiment,
The shape, size, form, number, arrangement location, and the like are not limited as long as the present invention can be achieved.

[0032]

As described above, according to the present invention, according to the present invention, in the forklift constructed as described above, the swing actuator is provided by providing the swing free hydraulic circuit. You can switch freely. In addition, the shift actuator can be freely switched by providing the shift-free hydraulic circuit.

For this reason, when the battery mounted on the fork is placed at the mounting location and the battery contacts the guide frame at the mounting location, a force is applied to the battery from the guide frame, causing the fork to swing or slide laterally. . Thereby, the battery is guided by the guide frame and accurately positioned at the loading position. Therefore, the battery can be easily placed at the loading position without any trouble.

Further, according to the present invention, the swing actuator can be freely switched by providing the swing free hydraulic circuit. For this reason, when placing the battery on the fork at the mounting location, if the battery contacts the guide frame at the mounting location,
Force is applied to the battery from the guide frame, causing the fork to swing laterally. Thereby, the battery is guided by the guide frame and accurately positioned at the loading position. Therefore, the battery can be easily placed at the loading position without any trouble.

According to the present invention, the shift actuator can be switched freely by providing the shift-free hydraulic circuit as described in claim 2. For this reason, when placing the battery on the fork at the mounting location, if the battery contacts the guide frame at the mounting location,
Force is applied to the battery from the guide frame, causing the fork to slide laterally. Thereby, the battery is guided by the guide frame and accurately positioned at the loading position. Therefore, the battery can be easily placed at the loading position without any trouble.

[Brief description of the drawings]

FIG. 1 is a side view showing a forklift according to a first embodiment of the present invention.

FIG. 2 is an exploded view showing a main part of the forklift according to the first embodiment of the present invention.

FIG. 3 is a plan view illustrating a state in which the fork of the forklift according to the first embodiment of the present invention swings in the left-right direction.

FIG. 4 is a view taken in the direction of arrow C in FIG. 1;

FIG. 5 is a plan view illustrating a state in which the fork of the forklift according to the first embodiment of the present invention is slid in the left-right direction.

FIG. 6 is a hydraulic circuit diagram of the forklift according to the first embodiment of the present invention.

FIG. 7 is a diagram showing a main part of FIG. 6;

FIG. 8 is a diagram illustrating an operation lever of the forklift according to the first embodiment of the present invention.

FIG. 9 is a diagram illustrating a battery loading operation of the forklift according to the first embodiment of the present invention.

FIG. 10 is a hydraulic circuit diagram of a forklift according to a second embodiment of the present invention.

FIG. 11 is a diagram illustrating the operation of a conventional forklift.

[Explanation of symbols]

 10 Forklift 11 Body 15 Fork 20 Swing means 27 Swing actuator (swing cylinder) 30 Shift means 32 Shift actuator (shift cylinder) 50, 75 Swing free hydraulic circuit 55, 78 Shift free hydraulic circuit

Claims (3)

[Claims] 1. A forklift having a swinging means capable of swinging a fork in a lateral direction, wherein a swinging free hydraulic circuit capable of freely switching a swinging actuator for operating the swinging means is provided. Features a forklift. 2. A forklift having shift means capable of sliding a fork in a lateral direction, comprising a shift-free hydraulic circuit capable of freely switching a shift actuator for operating the shift means. . 3. A forklift having a swing means capable of swinging a fork in a lateral direction and a shift means capable of sliding a fork in a lateral direction, wherein a swing actuator for operating the swing means is free. A forklift comprising a switchable swing-free hydraulic circuit, and a shift-free hydraulic circuit capable of freely switching a shift actuator for operating the shift means.