JP4650856B2 - Forklift truck - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a forklift truck equipped with a fork claw that moves up and down and tilts back and forth at the front of a vehicle body.
[0002]
[Prior art]
Conventionally, a forklift truck is provided with a pair of left and right masts 2 erected at the front portion of a vehicle body 1 as shown in the overall explanatory view of FIG. 1, and the mast 2 is attached over the vehicle body 1 and the mast 2. The pair of left and right tilt cylinders 3 was tilted back and forth. A lift bracket 4 that moves up and down along the mast 2 is provided, and the lift bracket 4 is moved up and down by a pair of left and right lift cylinders 5 erected along the mast 2. The lift bracket 4 is provided with a pair of left and right fork claws 6. The fork claws 6 are L-shaped from a horizontal body 7 on which a load is placed and a vertical body 8 arranged on the rear side of the load.
[0003]
In such a forklift truck, when performing a loading operation for taking out the cargo stored on a shelf or the like, the operator adjusts the fork claw to the loading height position by visual inspection, but this operation is easily performed. In particular, there was a problem that it was very difficult to align the height of the fork claws at a high place.
[0004]
Therefore, the lift bracket is provided with a laser pointer that irradiates a laser beam, and this laser pointer is arranged in the vicinity of the lateral body of the fork claw so as to irradiate the laser beam forward on a parallel line parallel to the lateral body of the fork claw. I was doing. Then, when performing the loading operation, the operator adjusts the fork claw to the loading height position by the laser beam irradiated from the laser pointer.
[0005]
[Problems to be solved by the invention]
In such a conventional forklift truck, when performing the unloading operation, the operator adjusts the fork pawl to the unloading height position by the laser beam emitted from the laser pointer. If the horizontal body is also horizontal, first adjust the fork claw height with the laser pointer and then move the fork lift truck forward to move the fork claw horizontal body horizontally at the specified height position. However, if the horizontal body of the fork claw is inclined with respect to the horizontal when the ground is inclined or the vehicle body is inclined, the horizontal body of the fork claw The operator cannot recognize that it is slanting with respect to the horizontal, and after first adjusting the height position of the fork claw with the laser pointer As the forklift truck moves forward, the height of the fork claws gradually shifts and eventually greatly shifts, and the fork claws collide with a load, a pallet, or a member such as a shelf storing the luggage. There was a problem such as.
This invention makes it the subject to eliminate these problems.
[0006]
[Means for Solving the Problems]
A first aspect of the present invention is a forklift truck equipped with a fork claw that is moved up and down along the mast and tilts back and forth through the mast and that has a L-shaped fork claw through the mast. A light emitting means for irradiating a laser beam in front of a parallel line parallel to the horizontal body of the fork claw in conjunction with movement and forward / backward tilt is provided. It is equipped with a vertical bracket that moves and is always vertical, and a transmission part that is always horizontal is formed on the vertical bracket so that the laser beam irradiated from the light emitting means can be transmitted. This is a forklift truck in which the laser beam irradiated from the means passes through a transmission part formed on the vertical bracket and is irradiated forward.
[0007]
A second invention is the laser according to the first invention, wherein the filter part is formed above and below the transmission part formed on the vertical bracket, and the light emitted from the light emitting means is emitted when the horizontal body of the fork claw is slightly inclined with respect to the horizontal. This is a forklift truck in which a light beam passes through a filter portion formed on a vertical bracket and a laser beam changes to irradiate forward.
[0008]
A third invention is a forklift truck provided with a buffering means for softening back-and-forth swinging of the vertical bracket with respect to the fork pawl in the first invention or the second invention.
[0009]
[Operation]
According to the first invention, when the horizontal body of the fork claw is inclined with respect to the horizontal, the laser beam emitted from the light emitting means is transmitted through the transmission part formed on the vertical bracket and is not irradiated forward. Therefore, the operator can easily recognize that the horizontal body of the fork claw is inclined with respect to the horizontal, and the operation can be easily performed.
[0010]
According to the second invention, in the case where the horizontal body of the fork claw is inclined with respect to the horizontal, the laser beam passes through the filter portion only when the horizontal body of the fork claw is slightly shifted up and down with respect to the horizontal. By passing through and changing and irradiating forward, the operator can easily recognize whether the horizontal body of the fork claw is slightly shifted up or down relative to the horizontal.
[0011]
According to the third aspect of the invention, the vertical bracket can be gently swung back and forth, and the laser beam emitted from the laser pointer is greatly suppressed from being shaken by the vibration, etc., so that the laser beam can be irradiated very well. be able to.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of a forklift truck according to the present invention will be described.
The forklift truck has a pair of left and right masts 2 standing upright at the front portion of the vehicle body 1 as shown in the overall explanatory view of FIG. It is tilted back and forth by a pair of left and right tilt cylinders 3 mounted over. A lift bracket 4 that moves up and down along the mast 2 is provided, and the lift bracket 4 is moved up and down by a pair of left and right lift cylinders 5 erected along the mast 2. The lift bracket 4 is provided with a pair of left and right fork claws 6. The fork claws 6 are L-shaped from a horizontal body 7 on which a load is placed and a vertical body 8 disposed on the rear side of the load.
[0013]
In the forklift truck having such a configuration, as shown in the explanatory view of FIG. 2, the laser beam interlocking with the up-and-down movement and the forward-backward tilting of the lift bracket 4 and the fork claws 6 is forwardly fixed by being fixed to the lift bracket 4. A laser pointer 11 which is a light emitting means 10 for irradiating is provided, and this laser pointer 11 is arranged in the vicinity of the horizontal body 7 of the fork claw 6 at the rear part of the lift bracket 4 and at a position slightly above the upper surface of the horizontal body 7. A laser beam is irradiated in front of a parallel line parallel to the horizontal body 7.
[0014]
On the other hand, a vertical bracket 12 is provided which is always vertical by being pivotally attached to the lift bracket 4 and interlocked with the lifting and lowering movements of the lift bracket 4 and the fork pawl 6. It is arranged at the front left and right center of the left and right fork claws, and has a vertically long shape, and its upper side is pivotally attached to the lift bracket 4 so as to swing back and forth, and hangs down. On the other hand, it swings back and forth and is always vertical.
[0015]
The vertical bracket 12 is formed with a through-hole-shaped transmission portion 13 that allows the laser beam irradiated from the laser pointer 11 to pass therethrough. The transmission portion 13 is set in a direction orthogonal to the longitudinal direction of the vertical bracket 12, that is, horizontal. Thus, only when the horizontal body 7 of the fork claw 6 is horizontal, the laser beam irradiated from the laser pointer 11 is transmitted through the transmission part 13 formed on the vertical bracket 12 and irradiated forward. When the horizontal body 7 is inclined with respect to the horizontal, the laser beam irradiated from the laser pointer 11 is blocked by the vertical bracket 12 without passing through the transmission part 13 formed on the vertical bracket 12.
[0016]
With this configuration, when carrying out the unloading operation for taking out the luggage stored on the shelf or the like, if the ground is horizontal and the horizontal body 7 of the fork claw 6 is also horizontal, the state description of FIG. As shown in the figure, the laser beam irradiated from the laser pointer 11 passes through the transmission part 13 formed on the vertical bracket 12 and is irradiated forward, so that the operator can lift the fork claw 6 to the unloading height position by the laser beam. You can work according to. On the other hand, when the horizontal body 7 of the fork claw 6 is inclined with respect to the horizontal while the ground is inclined or the vehicle body 1 is inclined, as shown in the state explanatory diagram of FIG. The more irradiated laser beam is blocked by the vertical bracket 12 without passing through the transmission part 13 formed in the vertical bracket 12. As a result, the operator can recognize that the horizontal body 7 of the fork claw 6 is inclined with respect to the horizontal, and the operator tilts the lift bracket 4 and the fork claw 6 back and forth via the mast 2, and the laser. The horizontal body 7 of the fork claw 6 is corrected horizontally so that the light beam passes through the transmission part 13 and is irradiated forward. Then, after correcting the forward / backward tilting of the fork pawl 6, the operator performs the work by adjusting the fork pawl 6 to the unloading height position with a laser beam.
[0017]
By doing so, when carrying out the cargo collection operation, the operator can recognize this when the horizontal body 7 of the fork claw 6 is inclined with respect to the horizontal. The horizontal position 7 of the fork claw 6 moves horizontally when the fork lift truck is advanced after the fork lift truck is advanced after the height position of the fork claw 6 is adjusted by the laser pointer 11. Collision with a member such as a luggage, a pallet or a shelf storing the luggage can be eliminated, and the operation can be easily performed.
[0018]
In addition, about the arrangement | positioning of the vertical bracket 12 and the laser pointer 11 which formed the permeation | transmission part 13 mentioned above, you may arrange | position to either the right and left of the lift bracket 4, or the center of right and left, respectively, and arrange | position to both right and left Also good.
[0019]
Next, a second embodiment of the forklift truck according to the present invention will be described.
In the configuration substantially the same as the forklift truck of the first embodiment described above, as shown in the state explanatory diagram of FIG. 5, the vertical bracket 12 forms a transmission portion 13 that can transmit the laser beam irradiated from the laser pointer 11. At the same time, filter portions 14 are formed above and below the transmission portion 13. Similarly to the above, the transmission part 13 is set in a direction orthogonal to the longitudinal direction of the vertical bracket 4, that is, in the horizontal direction, and the laser beam irradiated from the laser pointer 11 is irradiated to the vertical bracket 12 only when the horizontal body 7 of the fork claw 6 is horizontal. Then, the light passes through the transmission part 13 formed in the above and is irradiated forward. On the other hand, the filter unit 14 also transmits a laser beam when the horizontal body 7 of the fork claw 6 is slightly inclined up and down with respect to the horizontal, but the laser beam transmitted through the filter unit 14 changes and irradiates forward. This is because the filter unit 14 is made of a glass material or the like colored such as blue, yellow or red, and when the laser beam is transmitted through the filter unit 14, the laser beam is colored and changes. For example, the filter part 14 on the upper side of the transmission part 13 is blue, the filter part 14 on the lower side of the transmission part 13 is yellow, and the upper and lower parts are separated by color.
[0020]
With this configuration, when carrying out the unloading operation of taking out the luggage stored on the shelf or the like, if the ground is horizontal and the horizontal body 7 of the fork claw 6 is also horizontal, irradiation is performed from the laser pointer 11. The laser beam transmitted through the transmission part 13 formed on the vertical bracket 12 and irradiated forward allows the operator to perform the work by adjusting the fork pawl 6 to the loading height position by the laser beam. On the other hand, when the horizontal body 7 of the fork claw 6 is inclined with respect to the horizontal while the ground is inclined or the vehicle body 1 is inclined, the horizontal body 7 of the fork claw 6 is vertically 6, as shown in the state explanatory diagram of FIG. 6, the laser beam passes through the filter portion 14 formed on the vertical bracket 12, changes color, and is irradiated forward. When the horizontal body 7 of the fork claw 6 is largely displaced up and down with respect to the horizontal, the laser beam is blocked by the vertical bracket 12. As a result, the operator can recognize that the horizontal body 7 of the fork claw 6 is inclined with respect to the horizontal, and the operator tilts the lift bracket 4 and the fork claw 6 back and forth via the mast 2, and the laser. The horizontal body 7 of the fork claw 6 is corrected horizontally so that the light beam passes through the transmission part 13 and is irradiated forward. Then, after correcting the forward / backward tilting of the fork pawl 6, the operator performs the work by adjusting the fork pawl 6 to the unloading height position with a laser beam.
[0021]
In this way, as in the first embodiment described above, when performing the cargo collection operation, the operator can recognize this when the horizontal body 7 of the fork claw 6 is inclined with respect to the horizontal. The horizontal body 7 of the fork claw 6 is corrected horizontally, and after the fork lift truck is moved forward after the height position of the fork claw 6 is adjusted by the laser pointer 11, the side body 7 of the fork claw 6 is It moves horizontally, and it is possible to prevent the fork claw 6 from colliding with a member such as a luggage, a pallet or a shelf storing the luggage, and the work can be easily performed. In addition, since the filter portion 14 is formed on the vertical bracket 12, when the horizontal body 7 of the fork claw 6 is slanted with respect to the horizontal, the horizontal body 7 of the fork claw 6 is small in the vertical direction with respect to the horizontal. Only when they are displaced, the laser beam passes through the filter unit 14, changes color, and is irradiated forward, so that the operator has slightly shifted the horizontal body 7 of the fork claw 6 up and down with respect to the horizontal. It is possible to easily recognize whether or not there is a large deviation. Further, in the filter portion 14 formed on the vertical bracket 12, the operator separates the horizontal body 7 of the fork claw 6 from the horizontal side by distinguishing the upper filter portion 14 and the lower filter portion 14 with different colors. It is possible to instantly recognize whether it is inclined toward the lower side or the lower side, and the operation of correcting the fork claws 6 horizontally can be performed very smoothly.
[0022]
In addition, about this filter part 14, although the color was changed in the upper and lower sides, and upper and lower sides were distinguished, you may make this the same color up and down. Further, the filter unit 14 described above is configured to change the color of the laser beam, but instead, the filter unit 14 may be made of smoked glass so as to blur the laser beam. Furthermore, although the filter part 14 was formed in the upper and lower sides of the permeation | transmission part 13, you may make it form this in either one of the upper and lower sides, respectively.
[0023]
Next, another example of the first or second embodiment of the forklift truck according to the present invention will be described. This is provided with a buffer means 20 that softens the vertical bracket 12 from swinging back and forth with respect to the fork pawl 6. As the buffer means 20, as shown in the explanatory view of FIG. A vibration damper 21 made of rubber is attached to a portion where the vertical bracket 12 is attached, so that the vertical bracket 12 can be gently swung back and forth. Alternatively, as shown in the explanatory view of FIG. 8, a box 22 that covers the entire vertical bracket 12 is provided, and the vertical bracket 12 is filled with water or transparent oil and liquid inside the box 22. To ease the back and forth rocking. Alternatively, as shown in the explanatory view of FIG. 9, the ring body 23 is provided, and the front and rear rollers 24 that roll on the inner periphery of the ring body 23 are provided. The center of 25 is slidably inserted into the lower part of the vertical bracket 12 so that the vertical bracket 12 can be gently swung back and forth.
[0024]
As described above, by gently swinging the vertical bracket 12 back and forth, the laser beam irradiated from the laser pointer 11 can be greatly suppressed from being shaken by vibrations, and the laser beam can be irradiated very well. .
[0025]
Further, examples of other embodiments will be described. In each of the above-described embodiments, the laser beam emitted from the laser pointer 11 which is the light emitting unit 10 is irradiated with a point. For example, as shown in FIG. 10, a laser beam may be emitted from a laser pointer 11 along a line L that is horizontally long. When the laser pointer 11 having such a configuration is used, the vertical bracket 12 provided in front of the laser pointer 11 is horizontally long so that the laser beam irradiated from the laser pointer 11 can be transmitted through the center in the vertical direction as shown in FIG. A through-hole-shaped transmission part 13 is formed, and an upper filter part 14a is formed on the upper side of the transmission part 13 with a plurality of slits 15a extending vertically, and obliquely formed on the lower side of the transmission part 13 A lower filter portion 14b is formed which is provided with a plurality of slits 15b directed to the side.
[0026]
As a result, in the vertical bracket 12, as described above, only when the horizontal body 7 of the fork claw 6 is horizontal, the laser beam irradiated from the laser pointer 11 passes through the transmission part 13 and forms a horizontally long line L forward. Irradiate. On the other hand, when the horizontal body 7 of the fork claw 6 is inclined downward with respect to the horizontal, the laser beam irradiated from the laser pointer 11 passes through the lower filter portion 14b and irradiates forward as a broken line BL. At this time, when the lift bracket 4 and the fork pawl 6 are tilted back and forth, as shown in FIG. 12 (a), the broken line BL irradiated forward moves sideways, so that the operator can It can be recognized that the horizontal body 7 is inclined downward with respect to the horizontal. Further, when the horizontal body 7 of the fork claw 6 is inclined upward with respect to the horizontal, the laser beam irradiated from the laser pointer 11 passes through the upper filter portion 14a and is irradiated forward as a broken line BL. When the lift bracket 4 and the fork pawl 6 are tilted back and forth, the broken line BL irradiated forward stops as shown in FIG. It can be recognized that the horizontal body 7 of the nail 6 is inclined upward with respect to the horizontal.
[0027]
【The invention's effect】
When the horizontal body of the fork claw is inclined with respect to the horizontal, the laser beam emitted from the light emitting means passes through the transmission part formed on the vertical bracket and is not irradiated forward. It can be easily recognized that the body is inclined with respect to the horizontal, and when the horizontal body of the fork claw is corrected horizontally, the laser beam is transmitted through the transmission part formed on the vertical bracket. It is only necessary to tilt the fork claw back and forth so that it is irradiated forward, and this correction work can be performed easily. As a result, when carrying out the cargo collection operation, it is possible to avoid the fork claws from colliding with a member such as a luggage, a pallet or a shelf storing the luggage, and the operation can be easily performed.
[0028]
In addition, when the horizontal body of the fork claw is inclined with respect to the horizontal due to the formation of the filter part on the vertical bracket, the laser is only used when the horizontal body of the fork claw is slightly displaced vertically relative to the horizontal. As the light beam passes through the filter part and changes and is irradiated forward, the operator can easily adjust the degree of deviation of whether the horizontal body of the fork claw is slightly shifted up or down relative to the horizontal. Can be recognized.
[0029]
In addition, by providing a buffer means, the vertical bracket can be gently swung back and forth, and the laser beam emitted from the laser pointer is greatly suppressed from shaking due to vibration, etc. Can be done.
[Brief description of the drawings]
FIG. 1 is an overall explanatory view of a forklift truck.
FIG. 2 is an explanatory diagram of a first embodiment of the present invention.
FIG. 3 is an explanatory diagram of a state of the first embodiment of the present invention.
FIG. 4 is an explanatory diagram of a state of the first embodiment of the present invention.
FIG. 5 is a state explanatory diagram of a second embodiment of the present invention.
FIG. 6 is a state explanatory diagram of a second embodiment of the present invention.
FIG. 7 is an explanatory diagram of another embodiment of the present invention.
FIG. 8 is an explanatory diagram of another embodiment of the present invention.
FIG. 9 is an explanatory diagram of another embodiment of the present invention.
FIG. 10 is an explanatory diagram of another embodiment of the present invention.
FIG. 11 is an explanatory diagram of a vertical bracket according to another embodiment of the present invention.
FIG. 12A is a diagram for explaining the state of another embodiment of the present invention.
(B) It is state explanatory drawing of other embodiment of this invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Car body, 2 ... Mast, 3 ... Tilt cylinder, 4 ... Lift bracket, 5 ... Lift cylinder, 6 ... Fork claw, 7 ... Horizontal body, 8 ... Vertical body, 10 ... Light emission means, 11 ... Laser pointer, 12 ... Vertical bracket, 13 ... Transmission part, 14 ... Filter part, 14a ... Upper filter part, 14b ... Lower filter part, 15a ... Slit, 15b ... Slit, 20 ... Buffering means, 21 ... Vibration damper, 22 ... Box, 23 ... Ring body, 24 ... roller, 25 ... arm.

Claims (3)

In a forklift truck having a fork claw 6 which is moved up and down along the mast 2 and tilts back and forth via the mast 2 and a fork claw 6 having an L shape from the vertical body 8,
The light emitting means 10 irradiates a laser beam in front of a parallel line parallel to the horizontal body 7 of the fork claw 6 in conjunction with the up-and-down movement and the forward / backward tilt of the fork claw 6, and in conjunction with the up-and-down movement of the fork claw 6. In addition, a vertical bracket 12 that swings back and forth with respect to the fork claw 6 and is always vertical is formed, and a transmission portion 13 that is always horizontal is formed in the vertical bracket 12 so that the laser beam irradiated from the light emitting means 10 can be transmitted. Thus, when the horizontal body 7 of the fork claw 6 becomes horizontal, the laser beam emitted from the light emitting means 10 passes through the transmission part 13 formed in the vertical bracket 12 and is irradiated forward. truck. When the filter part 14 is formed above and below the transmission part 13 formed on the vertical bracket 12 and the horizontal body 7 of the fork claw 6 is slightly inclined with respect to the horizontal, the laser beam irradiated from the light emitting means 10 is applied to the vertical bracket 12. 2. The forklift truck according to claim 1, wherein the laser beam changes through the formed filter portion and is irradiated forward. The forklift truck according to claim 1 or 2, further comprising a buffer means (20) for softening a swing of the vertical bracket (12) relative to the fork claw (6).

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