JP2003048699A - Load handling vehicle and display method in load handling vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an effective technology for performing a smooth load handling operation according to a specified operation form in a load handling vehicle formed such that a handled load held by a load holding means liftably operated along a mast is fixed to the load holding means based on the lifting operation of the load holding means. SOLUTION: In a forklift truck, a pallet fixing device 10 for fixing a pallet 8 to a fork 6 comprises a release operation mechanism 40 for forcibly releasing the fixing of the pallet 8. The release operation mechanism 40 is formed mainly of a foot release pedal 41. When the release pedal 41 is in the state of fixing the pallet 8 to the fork 6, the release pedal 41 is projected by a specified amount from the upper surface of a lift table 4. When the release pedal 41 is depressed in this state, the fixing arm 11 is set in a fixing release state, and the fixing of the pallet 8 to the fork 6 can be released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cargo handling vehicle having a cargo handling object holding means that moves up and down along a mast, and more specifically, a cargo handling object held by the cargo handling object holding means with respect to the cargo handling object holding means. A technique for fixing or releasing the fixation.

[0002]

2. Description of the Related Art Conventionally, in an elevator-lifting type loading / unloading vehicle in which a worker rides in an elevator / lifting unit to perform traveling and cargo-handling work, a pallet having a fork inserted therein is fixed to the fork side to stabilize the cargo-handling work. . A cargo handling vehicle provided with such a pallet fixing device is disclosed in, for example, Japanese Patent Laid-Open No. 8-165.
096 publication. As in the cargo handling vehicle described in this publication, in the cargo handling work, after inserting the fork into the pallet, the operator operates the pallet fixing device by operating the operating member such as the lever or the pedal to fix the pallet. It was common to unlock.

[0003]

However, in the above-mentioned conventional cargo handling vehicle, since the operation of the pallet fixing device, that is, the fixing operation and the releasing operation of the pallet depends on the operator, the operator is required to perform the operation. You have to get it, and the operator is forced to do something other than actual work. Therefore, there is a demand for a pallet fixing device that can automatically perform a pallet fixing operation and a pallet fixing operation based on, for example, a lifting and lowering operation of a fork without depending on an operator. For example, a pallet fixing device having a configuration in which the pallet is automatically fixed when the fork is lifted above a certain lifting height and the pallet is automatically released when the fork is lowered below a certain lifting height is conceivable. . However, in such a pallet fixing device, there is a problem that the pallets cannot be arbitrarily fixed above a certain lifting height, such as when assembling the pallets in a multi-tiered rack. In this way, even if the pallet is automatically fixed or unfixed via the pallet fixing device,
Depending on the work mode, it is necessary for the operator to arbitrarily operate the cargo handling device fixing device.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and the problem is that
A desired working mode for a cargo handling vehicle configured to fix the cargo handling object held by the cargo handling article holding means that moves up and down along the mast to the cargo handling article holding means based on the lifting movement of the cargo handling article holding means. It is to provide effective technology for smooth cargo handling.

[0005]

In order to solve the above-mentioned problems, the cargo handling vehicle of the present invention is constructed as described in claims 1 to 4. The display method in the cargo handling vehicle according to the present invention is as described in claims 5 and 6. Note that the inventions according to these claims are such that the cargo holding means that moves up and down along the mast, and the cargo that is held by the cargo holding means is fixed to the cargo holding means based on the lifting operation. With regard to a cargo handling vehicle having a means, a releasing means for artificially releasing the fixing state of the fixing means is provided, or a setting state of the fixing means is displayed to smoothly carry out the cargo handling work according to a desired work form. It is a technology that makes it possible.

In the cargo handling vehicle according to the first aspect of the present invention, the cargo handling article holding means and the fixing means are provided. The cargo material holding means can move up and down along the mast while holding the cargo material. The term "cargo material holding means" as used herein is meant to broadly include various configurations capable of holding a cargo material, and a fork is preferably used. Further, the "cargo material" referred to here is in a form corresponding to the cargo material holding means, and in many cases, a pallet held via a fork serving as the cargo material holding means serves as the cargo material. The fixing means is for fixing the cargo handling article held by the cargo handling article holding means to the cargo handling article holding means based on an ascending / descending operation.
That is, the fixing means automatically fixes the cargo material when the lift, speed, acceleration, etc. of the cargo material holding means reach predetermined values. In addition, the term "fixing means" as used herein is intended to include a wide range of means for fixing the cargo to the fork, and for example, the cargo is held by the fork serving as the cargo holding means and the fixing means. There is also a form of fixing the cargo to the fork by clamping the cargo itself. Further, the cargo handling vehicle of the present invention is provided with a releasing means. The releasing means is configured to artificially set the fixing means, which is in the fixed state for fixing the cargo, to the fixed release state. That is, the releasing means includes an operating member operated by the operator with his / her hand or foot, and the fixed state of the fixing means is arbitrarily released in association with the operation of the operating member. The releasing means is preferably configured using an operation member such as a foot-operated pedal member operated by a pedaling force or an operation lever operated manually. As a result, for example, for cargo-handling vehicles that are set to a fixed state when the lift exceeds a certain level,
When assembling pallets in a multi-tiered rack, an operator can release the pallets from fixing at a certain level or higher. As described above, according to the first aspect of the invention, smooth cargo handling work can be performed according to a desired work mode. It should be noted that the "cargo handling vehicle" in the present invention broadly includes various vehicles that perform cargo handling work via forks, for example, forklift vehicles such as order pickers.

Here, the releasing means described in claim 1 is provided with a foot-operated pedal member as described in claim 2, and the fixed state of the fixing means is released in conjunction with the operation of the pedal member. It is preferably configured. For example, when an operator steps on the pedal member with his / her foot, the pedal force is activated by the pedaling force, and the fixing means in the fixed state is set to the released state. Thereby, the operator can easily release the fixed state of the fixing means. Further, since the pedal member operated by the pedaling force is used, the pedal member can be set so as not to operate easily by manual operation or the like. Therefore, by configuring the pedal member to operate with a pedaling force of a predetermined value or more, it is possible to avoid erroneous operation of the pedal member as much as possible.

In the pedal member described in claim 3, the protrusion amount from the predetermined reference position as described in claim 3 is
It is preferable that the fixing means and the fixing release state of the fixing means have different configurations. For example, when the fixing means is in the fixed state, the worker depresses the pedal member that is in a state of protruding from the floor surface, whereby the fixing means is set to the fixed release state,
Moreover, the pedal member is held in the depressed position. At this step-in position, the amount of protrusion from the floor surface is set to be smaller than that before the step-in. Thus, the operator can determine whether the fixing means is set to the fixed state or the fixed release state depending on whether or not the pedal member is depressed. Therefore, it is rational that the releasing means for artificially releasing the fixed state of the fixing means can also be used as the display means capable of discriminating the setting state of the fixing means.
That is, it is not necessary to newly provide a detection device or the like so that the worker can determine the setting state of the fixing means.

Further, in the cargo handling vehicle according to the present invention, a fixing means for fixing the cargo handling object held by the cargo handling article holding means that moves up and down along the mast to the cargo handling article holding means based on the lifting operation. Is provided. Further, there is provided display means for displaying that the fixing means is set in the fixing state or the releasing state. It suffices that the display means has a configuration that enables the operator to determine the setting state of the fixing means, and broadly includes a configuration that allows the operator to visually and audibly determine the setting state. Examples of the visually distinguishable display form include, for example, a mode in which a movable member whose position is changed according to the setting state of the fixing means is provided, a display color of the lamps and a lighting mode in accordance with the setting state of the fixing means. It is possible to use a mode in which the above are changed, a mode in which the setting state of the fixing means is directly displayed in characters, and the like. Thereby, the operator can easily determine the setting state of the fixing means.

According to the display method for the cargo handling vehicle according to the fifth aspect, the worker can easily determine the setting state of the fixing means.

Further, according to the display method in the cargo handling vehicle according to the sixth aspect, the releasing means for artificially releasing the fixed state of the fixing means is also used as the display means capable of discriminating the setting state of the fixing means. Can be rational.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. In addition, in the present embodiment, the present invention is applied to an ascending / descending section loading type forklift such as an order picker. Here, FIG. 1 is a perspective view of a forklift 1 of an embodiment of a cargo handling vehicle of the present invention. FIG. 2 is a perspective view showing the configuration of the pallet fixing device 10. FIG. 3 is a view showing the bottom surface of the forklift 1. FIG. 4 is a perspective view showing the configuration of the arm operating mechanism 30. 5 to 7 are all partially enlarged views showing the operation of the fixed arm urging mechanism 20. FIG. 8 is a partially enlarged view showing the structure of the release pedal 41. 9 and 10 are perspective views showing the relationship between the fixing arm 11 and the release pedal 41 for the pallet fixing device 10. 1 to 4, an arrow RR in the drawings indicates the rear of the vehicle,
Arrow UP indicates the upper side of the vehicle.

As shown in FIG. 1, a forklift 1 as a cargo handling vehicle of the present invention comprises a vehicle body 2, a cargo handling mast 3 installed in front of the vehicle body 2, and an elevator platform 4 which moves up and down along the cargo handling mast 3. Have. Although not specifically shown, the cargo handling mast 3 includes a fixed mast (outer mast) and a movable mast (inner mast) that moves up and down along the fixed mast. The lift table 4 is fixed to a lift bracket 9 which can be moved up and down with respect to a movable mast, and is lifted and lowered via a lift cylinder and a lift chain.

The lifting table 4 or the lift bracket 9 is provided with an operating section 5 for lifting and traveling operations which can be operated by an operator who is on the lifting table 4.
Further, the release pedal 41 provided on the upper surface of the lifting table 4 and the pair of left and right fixed arms 11 extending forward from the front end 4a of the lifting table 4 constitute a fixing device 10 described later. The lifting table 4 is also provided with a pair of left and right forks 6. The fork 6 is detachably fixed to the lower surface of the lifting table 4 with a bolt 7 (see FIG. 3), and extends forward from the front end 4a of the lifting table 4, and the extending portion thereof is attached to the pallet 8 The pallet 8 is held by being inserted into the insertion port 8a. This pallet 8 corresponds to the cargo handling article in the present invention, and the fork 6 holding the pallet 8 corresponds to the cargo handling article holding means in the present invention.

A pallet fixing device 10 for fixing the pallet 8 held by the fork 6 to the fork 6 is provided on the lower surface side of the lifting table 4. This pallet fixing device 10 corresponds to the fixing means in the present invention. As shown in FIG. 2, the pallet fixing device 10 includes a pair of left and right fixing arms 11 arranged at predetermined intervals.
Have. Both fixed arms 11 are integrated by connecting a base member 12 fixed to the base side thereof to each other via a connecting member 13. Further, the base side member 12 is inserted into the rotary shaft 14 through the hole 12a, and both fixed arms 1
1 is supported by a rotary shaft 14. This rotation axis 1
4 are fixed to left and right brackets 15 fixed to the lifting table 4. Therefore, both fixed arms 11 can rotate about the rotation shaft 14.

As shown in FIG. 3, the left and right fixed arms 11 are arranged along the inner surface of the fork 6 and are inserted into the pallet 8 together with the fork 6. When fixing the pallet 8 to the fork 6, use the fork 6 to
With the upper plate 8b supported from below, the fixed arm 11 is rotated downward so that the tip of the fixed arm 11 is brought into contact with the upper surface of the lower plate 8c of the pallet 8 and the lower plate 8c is pressed from above. Press down (see Figure 7). In this way, the pallet 8 is fixed to the fork 6 by the cooperation of the fork 6 and the fixed arm 11.

As shown in FIG. 3, the base side member 12 and the connecting member 13 are fixed to each other via a fixing bolt 50. That is, a bolt hole (not shown) formed in the base member 12 and a through hole 13 formed in the connecting member 13.
The fixing arm 11 is fixed to the connecting member 13 by screwing the fixing bolt 50 inserted into the through hole 13 a into the bolt hole of the base-side member 12 with the position of a aligned. The through holes 13a are formed at a plurality of locations (three locations in the present embodiment) in the longitudinal direction of the connecting member 13 corresponding to each fixed arm 11. Therefore, the fixing bolt 5
By changing the position of the through hole 13a for inserting 0,
Set the fixed position of each fixed arm 11 to the connecting member 13 to 3
It can be changed in stages. That is, in the present embodiment, the relative position between the fixed arm 11 and the fork-side member is variable stepwise. The position where the through hole 13a is provided is set so that the fixed arm 11 is arranged along the inner side surface of the fork 6 even when the width of the fork 6 is changed.

As shown in FIG. 2, the pallet fixing device 10
Includes a link mechanism 20 with a biasing function that biases the left and right fixed arms 11 in a fixing direction (a locking direction for pressing the pallet 8) or a fixing releasing direction (an unlocking direction) (hereinafter, referred to as a fixed arm biasing mechanism 20). Is provided. The fixed arm urging mechanism 20 includes a rod 21 connected to the actuating lever 17, a U-link 22 connected to the rod 21, and a compression coil spring 23 interposed between the rod 21 and the U-link 22. .

One end of the fixed arm urging mechanism 20 is connected to the upright portion 16 of the connecting member 13 via the connecting pin 25 so that it is connected to the member on the fixed arm side. An operating lever 17 is provided at the other end of the fixed arm urging mechanism 20, and the operating lever 17 is attached to the lift base 4 via a bracket 18 so as to be rotatable.
Is stuck to. When the operating lever 17 rotates about the rotation shaft 19, the fixed arm 11 rotates in the fixing direction (locking direction) or the fixing releasing direction (unlocking direction) via the fixed arm urging mechanism 20. To do. For example,
The actuating lever 17 pivots in a predetermined direction around the pivot shaft 19, whereby the fixed arm 11 is pivoted in the fixed direction, and the actuating lever 17 pivots in the opposite direction, whereby the fixed arm 11 is rotated. It is configured to rotate in the fixing release direction. When the fixed arm 11 is rotated in the fixed direction, the fixed state is maintained by applying a biasing force in the fixed direction via the compression coil spring 23. On the other hand, when the fixed arm 11 is rotated in the fixing release direction, an urging force in the fixing direction is applied via the compression coil spring 23, so that the fixing release state is maintained.

As shown in FIGS. 5 to 7, the rod 21 is rotatably connected to the operating lever 17 by a connecting pin 24, and the U-link 22 is connected to the connecting member 13 of the fixed arm 11. It is connected by a connecting pin 25 so as to be vertically rotatable. Then, one end of the rod 21 is connected to the U-link 22.
While slidably penetrating the base of the U, the front flange 21a attached to the penetrating end prevents the U-link 22 from coming off. That is, the distance L between the connecting points connecting the connecting pin 24 of the rod 21 and the operating lever 17 and the connecting pin 25 of the U-link 22 and the connecting member 13 is
The state shown in FIG. 5 is the longest, and contraction is possible.

The compression coil spring 23 is interposed between the rear flange 21b fixed on the axis of the rod 21 and the U-link 22, and is assembled in a state in which it is compressed by a predetermined amount from its natural length. At this time, the fixed arm urging mechanism 20 is in the most extended state. Since the distance between the front flange 21a and the rear flange 21b is constant, the fixed arm biasing mechanism 20 itself is rigid when the fixed arm biasing mechanism 20 is in the most extended state.

When the operating lever 17 is rotated about the rotating shaft 19, the connecting pin 24 connecting the operating lever 17 and the rod 21 is positioned at the rotating shaft 19 and the connecting pin 25.
It is displaced up and down with a reference line P connecting between and. That is,
When the position of the connecting pin 24 coincides with the reference line P, the distance L between the connecting points becomes shortest (see FIG. 6), and the elastic biasing force (spring force) of the compression coil spring 23 becomes maximum. This time is the top dead center (neutral position) of the compression coil spring 23. On the other hand, when the position of the connecting pin 24 is displaced to the upper side of the reference line P, the distance L between the connecting points becomes the intermediate length (see FIG. 7), and at this time, the fixed arm 11 is in the fixed state. The pressing of the fixed arm 11 at this time occurs by crushing the compression coil spring 23. Further, when the connecting point is displaced below the reference line P, the distance L between the connecting points becomes the longest (see FIG. 5), and at this time, the fixed arm 1
1 is in the fixed release state. In this unlocked state, the fixed arm 11 is parallel to the fork 6,
In addition, the fork 6 is contained within the thickness (height) range, which does not hinder the work of inserting the fork 6 into the pallet 8. In this way, the elastic biasing force (spring force) of the compression coil spring 23 that passes through the top dead center of the compression coil spring 23 and acts on the operating lever 17 while the fixed arm 11 is set to the fixed state and the fixed release state. The direction of action of is switched (reversed). Therefore, the elastic biasing force (spring force) of the compression coil spring 23 becomes a biasing force for rotating the fixed arm 11 in the fixing direction between the neutral position and the fixed state of the fixed arm 11, and the fixed arm 11 moves to the neutral position. From the to the release state, the biasing force acts to rotate the fixed arm 11 in the release direction.

A return spring 26 for urging the fixed arm 11 in the fixing releasing direction is provided between the fixed arm 11 and the lifting table 4. This return spring 26
Is for assisting the rotational movement of the fixed arm 11 in the fixing release direction and for maintaining the fixed arm 11 at the release position, and its elastic biasing force (spring force) is much larger than that of the compression coil spring 23. Small.

Next, the arm operating mechanism 30 for fixing or releasing the fixed arm 11 of the pallet fixing device 10 based on the lifting operation of the lifting table 4 will be described. As shown in FIG. 4, the arm operating mechanism 30 includes an operating lever 17
Two upper and lower dog members 3 installed on the outer surface of the actuating arm 31 and the cargo handling mast 3 fixed on the rotating shaft 19 of
2, 37, the operating mode of which is shown in FIG.
~ Shown in FIG. An operating arm 31 that is integrated with the operating lever 17 via a rotary shaft 19 has a tip protruding from the rear surface of the lift 4. Then, corresponding to the ascending / descending region (trajectory) of the projecting tip of the operating arm 31,
On the outer surface of the cargo handling mast 3 (fixed mast), a dog member 32 for fixed operation and a dog member 37 for release operation are set at predetermined intervals in the vertical direction.

The dog member 32 for fixed operation is used for the lifting table 4
Is brought to a constant height position, that is, a reference height position, by contacting the tip of the operating arm 31,
This is rotated downward. As a result, the actuating lever 17 is turned upward via the turning shaft 19, and the fixed arm 11
Is rotated in the fixed direction (see FIG. 6). The reference height position is set to a position corresponding to the height of the upper pallet when, for example, 2 to 3 pallets 8 are stacked. In this case, the dog member 32 for fixed operation is preferably configured to be variable in the vertical direction, that is, the height position can be adjusted.

Further, the dog member 32 for fixed operation is a lever-like member rotatably attached to the side surface of the cargo handling mast 3 by a pin 33, and is rotated upward in the substantially horizontal state shown in the drawing. Is restricted by the stopper pin 34, but downward rotation is permitted. That is, the dog member 32 for fixed operation is movable, and is configured to be capable of retracting and rotating downward when being pushed by the tip of the operating arm 31 when the lifting table 4 is lowered. The dog member 32 is always provided with the return spring 35.
And is held in an operable position regulated by the stopper pin 34. Further, a roller 36 is attached to the tip of the dog member 32 to reduce wear caused by contact with the operating arm 31.

The dog member 37 for releasing operation is fixed to the mast 3 for cargo handling, and when the lifting table 4 is lowered,
By contacting the tip of the operating arm 31, this is rotated upward. As a result, the actuating lever 17 is turned downward via the turning shaft 19 to turn the fixed arm 11 in the fixing releasing direction (see FIG. 5).

As described above, the operating arm 31 and the dog member 32 for fixed operation or the dog member 3 for releasing operation.
7 is for rotating the fixed arm 11 in the fixing direction or the fixing releasing direction by utilizing the rotating operation of the operation arm 31 associated with mutual contact.

In the pallet fixing device 10 constructed as described above, when the fork 6 is inserted into the pallet 8 near the lower end of the lifting table 4 and the lifting of the lifting table 4 is started, the lifting table 4 is moved to the reference height. When the position is reached,
The actuating arm 31 comes into contact with the dog member 32 for fixed operation and is turned downward, and accordingly, the fixed arm 11 is turned in the fixing direction from the actuating lever 17 via the fixed arm biasing mechanism 20. As a result, in the pallet 8 with the lower surface of the upper plate 8b held by the left and right forks 6, the upper surface of the lower plate 8c is pressed by the tips of the left and right fixed arms 11 (see FIG. 7). As a result, the pallet 8 is fixed in a stable state with no wobbling in plan view. At this time, as described above, the spring force of the compression coil spring 23 in the fixed arm urging mechanism 20 effectively acts on the fixed arm 11 in the fixing direction and exerts a predetermined pressing force.

When the actuating arm 31 is rotated downward due to contact with the dog member 32 for fixed actuation, the tip of the actuating arm 31 moves up and down as shown in FIG.
Of the dog member 32, and is displaced to a region that does not contact the dog member 32. Therefore, when the elevating table 4 is operated to descend, the operating arm 31 passes through the side of the fixed dog member 32 and comes down without contacting the dog member 32 for fixed operation. Then, the dog member 3 for releasing operation at the descending end
When it comes into contact with 7, it is rotated in the releasing direction. That is,
The pallet fixing device 10 according to the present embodiment is provided with a lifting table 4
At the time of ascent, the pallet 8 is fixed at the reference height position, and at the time of lowering, the pallet 8 is lowered to the descent end while maintaining the fixing of the pallet 8, and the fixation is released at the descent end.

As described above, according to the present embodiment, the pallet fixing device 10 can be automatically fixed or released at the reference height position and the lower end position only by raising and lowering the raising and lowering table 4. it can. For this reason, the worker uses the fork 6
It is no longer necessary to perform the fixing operation or the releasing operation of the pallet 8 inserted in, and it is possible to concentrate on the actual operation. Along with this, auxiliary equipment such as a safety device and a warning device, which are required in the conventional type that depends on the operation of the operator, becomes unnecessary, and the cost of the cargo handling vehicle can be reduced.

Next, the structure, operation, etc. of the release operation mechanism 40, which is a characteristic part of the present invention, will be described. The pallet fixing device 10 is provided with a releasing operation mechanism 40 (corresponding to the releasing means in the present invention) for forcibly (manually) releasing the fixing of the pallet 8. As shown in FIGS. 2 and 8, the release operation mechanism 40 mainly includes a foot-operated release pedal 41. The release pedal 41 corresponds to the pedal member in the present invention. The release pedal 41 is arranged in a rectangular opening 4 a formed on the upper surface of the lift 4. The release pedal 41 is the lifting table 4
Is rotatably attached to the upper end of the lift table 4 by the operating lever 17 when the operating lever 17 is rotated in the fixed direction. (See the solid line in FIG. 8).

When the operating lever 17 is in a fixed state for fixing the pallet 8 to the fork 6, as shown in FIG. 10, the release pedal 41 moves the upper surface of the lift table 4 (corresponding to the reference position of the present invention). A certain amount). On the other hand, when the release pedal 41 is depressed at the position where the pallet 8 is fixed, as shown by the chain double-dashed line in FIG.
The release pedal 41 rotates the operating lever 17 in the fixing release direction. As a result, the fixed arm urging mechanism 20
The fixed arm 11 is rotated in the fixing release direction via the, and the fixing of the pallet 8 to the fork 6 is released. When the operating lever 17 is rotated in the fixing release direction, the release pedal 41 is lowered by its own weight, and although not shown,
For example, a part of the lower surface is set to be hooked on the floor surface of the lifting table 4 so that the upper surface is held at a position flush with the upper surface of the lifting table 4.

Further, since the release pedal 41 has a different protruding amount from the upper surface of the lifting table 4 between the fixed state and the fixed release state, the pallet fixing device 10 is in either the fixed state or the fixed release state. Can be used to show if it is set. That is, the release pedal 41 not only constitutes release means for artificially releasing the fixed state of the pallet fixing device 10, but is also used as display means by which the operator can determine the set state of the pallet fixing device 10. The operator can easily confirm the setting state of the pallet fixing device 10 by visually checking the protruding state of the release pedal 41, which is rational.

The manual release operation mechanism 40 as described above
By including the above, the fixation of the pallet 8 to the fork 6 can be released as necessary. Therefore,
For example, it is possible to handle the work of loading the pallets 8 at a high place or the work of unloading the pallets 8 at a high place. When the actuating lever 17 is rotated to the release position, the tip of the actuating arm 31 enters a region where it can contact the dog member 32 for fixed operation. For this reason, when the lifting table 4 is lowered after the release pedal 41 is depressed to operate the fixed arm 11 in the fixing release direction, when the lifting table 4 passes the reference height position, the tip of the operating arm 31 is moved. Contacts the dog member 32. At this time, as described above,
The dog member 32, which is allowed to rotate downward, is pushed by the actuating arm 31 and retracts as shown by the chain double-dashed line in FIG. 7, and its damage is prevented. in this way,
According to the present embodiment, the pallets 8 can be released from being fixed at an arbitrary height, so that the pallets can be loaded or unloaded without any trouble.

As described above, according to this embodiment, the pallet fixing device 10 set in the fixed state is manually released through the release operation mechanism 40. Therefore, smooth cargo handling work can be performed. In particular, the release pedal 41 is used to release the release operation mechanism 4
Since 0 is configured, the release operation can be easily performed, and the release pedal 41 can be operated with a pedaling force of a predetermined value or more, so that the erroneous operation of the release pedal 41 can be avoided as much as possible. Further, the release pedal 41 used to release the fixed state of the pallet fixing device 10 can be rational because it can also be used as a display means for displaying the set state of the pallet fixing device 10 depending on the protruding state of the release pedal 41. That is, there is no need to newly provide a detection device or the like so that the operator can determine the setting state of the pallet fixing device 10.

The present invention is not limited to the above-mentioned embodiment, and various applications and modifications are conceivable. For example, each of the following modes to which the above-described embodiment is applied can be implemented.

(A) In the above embodiment, the case where the release pedal 41 is used to artificially set the pallet fixing device 10 to the release state is described, but instead of such a pedal member, for example, a manual operation is performed. It is also possible to use an operating lever operated by.

(B) In the above embodiment, the case where the protruding state of the release pedal 41 indicates whether the pallet fixing device 10 is set to the fixed state or the fixed release state has been described. The setting state of the pallet fixing device 10 may be displayed by means other than the pedal 41. For example, it is possible to use display means for changing the display color, lighting mode, etc. of the lamps in accordance with the setting state of the pallet fixing device 10, and display means for directly displaying the setting state in characters.

(C) In the above embodiment, the case where the pallet 8 is held and fixed to the fork 6 has been described. The present invention can be applied to fixation.

(D) Further, in the above-mentioned embodiment, the forklift 1 of the lifting and lowering section such as the order picker has been described. However, in addition to the order picker, the present invention can be applied to various vehicles which carry out cargo handling work via a fork. Can also be applied.

[0042]

As described above, according to the present invention,
A desired working mode for a cargo handling vehicle configured to fix the cargo handling object held by the cargo handling article holding means that moves up and down along the mast to the cargo handling article holding means based on the lifting movement of the cargo handling article holding means. Accordingly, it is possible to realize an effective technique for performing smooth cargo handling work.

[Brief description of drawings]

FIG. 1 is a perspective view of a forklift 1 according to an embodiment of a cargo handling vehicle of the present invention.

FIG. 2 is a perspective view showing a configuration of a pallet fixing device 10.

FIG. 3 is a view showing a bottom surface of the forklift 1.

FIG. 4 is a perspective view showing a configuration of an arm actuating mechanism 30.

FIG. 5 is a partial enlarged view showing the operation of the fixed arm urging mechanism 20.

FIG. 6 is a partially enlarged view showing the operation of the fixed arm urging mechanism 20.

FIG. 7 is a partial enlarged view showing the operation of the fixed arm urging mechanism 20.

FIG. 8 is a partially enlarged view showing a configuration of a release pedal 41.

9 is a perspective view showing a relationship between a fixed arm 11 and a release pedal 41 of the pallet fixing device 10. FIG.

FIG. 10 shows a fixing arm 11 for the pallet fixing device 10.
6 is a perspective view showing the relationship between the release pedal 41 and the release pedal 41. FIG.

[Explanation of symbols]

1 ... Forklift 3 ... Mast for cargo handling 4 ... Lifting platform 6 ... Fork 8 ... Palette 10 ... Pallet fixing device 11 ... Fixed arm 12 ... Base member, 12a ... Hole 13 ... Connection member, 13a ... Through hole 17 ... Actuating lever 20 ... Fixed arm biasing mechanism 30 ... Arm actuation mechanism 31 ... Actuating arm 40 ... Release operation mechanism 41 ... Release pedal

Continued front page    F-term (reference) 3F333 AA02 AA15 AC01 AE39 BD02                       BE02 CA21 CA24 FA36 FG01                       FG04 FG06

Claims (6)

[Claims] 1. A cargo material holding means that moves up and down along a mast, and a fixing means that fixes the cargo material held by the cargo material holding means to the cargo material holding means based on the lifting operation. A cargo handling vehicle having the above, further comprising a releasing means for artificially releasing the fixed state of the fixing means. 2. The cargo handling vehicle according to claim 1, wherein the releasing means includes a foot-operated pedal member, and the fixed state of the fixing means is released in association with the operation of the pedal member. A cargo handling vehicle characterized by being configured. 3. The cargo handling vehicle according to claim 2, wherein the amount of protrusion of the pedal member from a predetermined reference position is different between a fixed state and a fixed release state of the fixing means. A cargo handling vehicle characterized by being 4. A cargo material holding means for moving up and down along a mast, and a fixing means for fixing the cargo material held by the cargo material holding means to the cargo material holding means based on the lifting operation. A cargo handling vehicle having: a cargo handling vehicle comprising display means for displaying that the fixing means is set to a fixed state or a fixed release state. 5. A cargo material holding means that moves up and down along a mast, and a fixing means that fixes the cargo material held by the cargo material holding means to the cargo material holding means based on the lifting operation. In the cargo handling vehicle which has, the display method characterized by having the step which displays whether the said fixing means is set to a fixed state or a fixed release state. 6. The display method for a cargo handling vehicle according to claim 5, wherein, as the fixing means, the fixing state of the fixing means is artificially released while the protrusion amount from a predetermined reference position is fixed. And a step of providing a foot-operated pedal member having different settings depending on whether the fixing means is in the fixed release state or the fixed release state based on the protruding state of the pedal member. And a display method for a cargo handling vehicle.