JP2006069776A - Three-way stacking truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-way stacking truck hard to be influenced by the kind of a pallet and capable of practicing a supporting method of a pallet not seriously demanding cargo handling precision. <P>SOLUTION: This three-way stacking truck 1 is constituted by arranging an elevating carriage 4 to revolve a fork 2 around an upright shaft 3 for rotation so as free to move to the front of a driver's seat and in the car widthwise direction and providing a pallet receiver 7 to support a bottom surface of the pallet 6 supported on the fork 2 from the lower side on a front edge of the driver's seat 5. A lengthy plate material, bar material or tube material along the car widthwise direction can be applied for the pallet receiver 7. Alternatively, it is possible to provide a plurality of short plate materials, bar materials or tube materials with intervals along the car widthwise direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a three-way stacking truck that operates in a warehouse or a factory.

As shown in Patent Document 1 below, various pallet locking mechanisms have been proposed as means for holding a pallet in a cargo handling vehicle. However, the present invention relates to a three-way stacking truck in which the direction (posture) of a fork changes in three directions. A pallet holding mechanism has not yet been proposed.
Moreover, the forklift shown in the following Patent Document 2 stabilizes the pallet by moving the tip of the fork toward the vehicle body and inserting a receiving tool into the fork insertion hole of the pallet supported by the fork. It is.
JP 2003-252585 A Japanese Utility Model Publication No. 50-17969

The forklift shown in Patent Document 2 changes the direction of the fork in four directions (vehicle traveling direction, driver's cab direction, both sides thereof), and a normal three-way stacking truck (front side of the vehicle, forks on both right and left sides). Is a different structure. The forklift stabilizes the pallet by moving the tip of the fork toward the vehicle body and inserting the fork insertion hole of the pallet supported by the fork into the holder (support the bottom of the pallet with the holder). )
In other words, in this structure, the pallet cannot be inserted into and supported by the pallet holder in a posture in which the fork is directed in either of the left and right directions. Therefore, it is impossible to apply the technique disclosed in Patent Document 2 to a normal three-way stacking track.

Furthermore, diversification of pallets on which packages are loaded is progressing, and it is necessary to cope with various specifications such as wooden to resin. For this reason, it is necessary to accurately align the mounting position of the receiving tool in accordance with the size of the pallet or the position of the fork insertion hole of the pallet. Therefore, a pallet support method that does not require such accuracy is desired.

SUMMARY OF THE INVENTION An object of the present invention is to provide a three-way stacking truck that is less affected by the type of pallet and that can implement a pallet support method that does not require strict handling accuracy.

The present invention includes a mast erected on a vehicle body, a cab arranged on the front side of the vehicle body and moved up and down along the mast, and provided on the front side of the cab and moved up and down, left and right, and In a three-way stacking truck that includes a fork that is turned around a vertical axis and performs a cargo handling operation on the front side and the left and right sides of the vehicle body, the fork supports the pallet bottom face in a posture that faces left or right. A pallet receiver is provided on the cab.

Furthermore, the three-way stacking truck according to the present invention is characterized in that the pallet holder is provided at a front edge of the cab.

Furthermore, the three-way stacking truck according to the present invention is characterized in that the pallet holder is made of a long material attached along the width direction of the cab. Alternatively, the pallet holder is made of a plurality of short materials attached at intervals along the width direction of the cab.

Furthermore, in the three-way stacking truck according to the present invention, the pallet receiver is attached to the driver's cab, a main body that extends forward of the driver's cab, and descends from the main body toward the front. And an inclined front inclined edge.

Furthermore, the three-way stacking truck according to the present invention is characterized in that the pallet holder includes a side inclined edge that is inclined downward from the main body portion in the width direction of the cab.

According to the three-way stacking truck according to the present invention, the pallet can be reliably supported even if the posture of the pallet changes variously with respect to the vehicle body as the fork turns and moves in the vehicle width direction. it can. Therefore, when the operator performs a picking operation on the pallet, even if an offset load is applied to the pallet by strongly stepping on the end of the pallet, the pallet can be prevented from tilting.

Moreover, since the pallet holder applied to the truck extends its main body to the front of the cab, small items on the pallet can be accidentally dropped from between the pallet and the cab during picking work. This can be prevented by the main body. Further, since the pallet holder is composed of a long material in a posture along the vehicle width direction or a plurality of small pieces arranged in the vehicle width direction, the above effect can be achieved at a very low cost.

As an example of the three-way stacking truck according to the embodiment of the present invention, a three-way stacking truck having a cab that is raised and lowered along a mast standing on a vehicle body will be described in detail in Example 1 below. Furthermore, in Example 2, a pallet holder applied to the track will be described.

As shown in FIGS. 1 and 2, the three-way stacking track 1 according to the embodiment of the present invention includes an elevating carriage 4 that rotates two forks 2 around a vertical upright shaft 3 that is a vertical axis. It is arranged in front of the cab 5 pointed by F so as to be movable in the vehicle width direction pointed by the arrow W, and the bottom surface of the pallet 6 supported by the two forks 2 is attached to the front edge of the cab 5. A pallet holder 7 to be received from the lower side is provided. For the pallet holder 7, a long plate material, bar material, or pipe material along the vehicle width direction as illustrated can be applied. Alternatively, a plurality of short plates, rods, or tubes may be provided at intervals along the vehicle width direction.

A pair of traverse guide rails 8 having one end and the other end along the vehicle width direction are respectively provided on the upper and lower portions of the cab 5 of the three-way stacking truck 1. As shown in FIG. 3, each of the pair of traverse guide rails 8 has rack gears 9 extending in the vehicle width direction fixed to the respective front surfaces, and groove portions for engaging the rollers 81 are formed on the respective upper or lower surfaces. Yes. Via these traverse guide rails 8 and rollers 81, the lifting carriage 4 is connected to the cab 5 so that it can freely move between one end and the other end of the traverse guide rails 8 in the vehicle width direction.

The three-direction stacking track 1 includes a shift driving device 10. The shift drive device 10 includes a pair of pinions 11 that mesh with the two rack gears 9 and a main shaft 12 that stands upright, and a pinion 14 that is an output shaft that meshes with one of the pair of pinions 11 via a gear 13. The hydraulic motor 15 is provided. When the first hydraulic motor 15 is activated by a hydraulic pressure generation pump or the like and the elevating carriage 4 travels along the pair of traverse guide rails 8, the fork 2 moves in the vehicle width direction together with the elevating carriage 4. This operation is hereinafter referred to as “shift”.

As shown in FIG. 2, the elevating carriage 4 has the fork 2 joined to the upright shaft 3 via a support plate 16. Inside the elevating carriage 4 is housed a turning drive device mainly composed of a second hydraulic motor 18 that applies a rotational force to the upright shaft 3 via a gear train 17. When the second hydraulic motor 18 is activated by a hydraulic pressure generating pump or the like and the upright shaft 3 is rotated, the upright shaft 3
Accordingly, the fork 2 turns.

Further, as shown in FIGS. 1 and 2, the three-way stacking track 1 includes a longitudinal guide rail 19 that guides the elevating carriage 4 in the vertical direction. The longitudinal guide rail 19 has a recess 191 having an upper end and a lower end and extending in the vertical direction and having an H-shaped or groove-shaped cross-sectional shape. By engaging the plurality of rollers 41 provided on the elevating carriage 4 with the recesses 191, the elevating carriage 4 and the longitudinal guide rail 19 are connected to each other.

Further, a lift cylinder 20 is fixed along the longitudinal guide rail 19, and the lift cylinder 2
A sprocket 21 is attached to the zero operating rod. A chain 22 having one end fixed to the longitudinal guide rail 19 and the other end fixed to the elevating carriage 4 is wound around the sprocket 21. When the sprocket 21 moves up and down according to the expansion and contraction of the lift cylinder 20,
The fork 2 moves up and down together with the lifting carriage 4.

According to the three-way stacking truck 1, the pallet holder 7 extends to the front of the cab 5, so that the fork 2 projects its tip 23 toward one end or the other end of the traverse guide rail 8, in other words. When the pallet 6 supported by the fork 2 is in a posture in which the longitudinal direction of the fork 2 is substantially parallel to the vehicle width direction, the lower edge 61 is received by the pallet holder 7. Details are as follows.

First, the fork 2 is projected straight forward to the posture shown by the solid line in FIG. 4, and then the fork 2 is inserted into the pallet 6 placed on the floor or the like as shown in FIG. Together with the lift carriage 4, it is raised to a suitable height higher than the cab 5. In addition to turning the fork 2 counterclockwise by about 90 ° from this state, the fork 2 is shifted to one end of the traverse guide rail 8 together with the lift carriage 4. Thereby, the edge part 61 of the pallet 6 supported by the fork 2 overlaps the pallet holder 7.

Alternatively, the fork 2 is projected to the side as indicated by a virtual line on the left side of FIG. The fork 2 is inserted into a pallet 6 housed at a position higher than the cab 5 such as a rack shelf, and is shifted to one end of the traverse guide rail 8 together with the elevating carriage 4 as it is. This
The edge 61 of the pallet 6 supported by the fork 2 overlaps the pallet holder 7. The above operation is always executed automatically or based on an operator's command before the three-way stacking truck 1 travels.

Subsequently, the fork 2 is gradually lowered together with the elevating carriage 4, and the edge 6 of the pallet 6 is
When 1 is placed on the pallet holder 7, the lowering of the fork 2 is stopped. In this state, since the pallet 6 is supported by the pallet holder 7, the operator who performs the picking operation tries to take out the article loaded on the pallet 6, for example, by striking the end of the pallet 6 strongly. Even if an unbalanced load is applied, the pallet 6 does not tilt.

As shown in FIGS. 2 and 5, the pallet receiver 7 includes an attachment portion 71 attached to the cab 5,
A main body 72 that extends forward of the cab 5 and supports the pallet 6; a front inclined edge 73 that slopes downward from the main body 72 toward the front of the cab 5; and a side that slopes downward toward the vehicle width direction It is the steel plate which shape | molded the part inclination edge 74 with the press. FIG. 5 corresponds to a portion surrounded by a virtual circle in FIG. In FIG. 5, only one end of the pallet holder 7 is shown and the other end is omitted. However, both ends of the pallet holder 7 are geometrically substantially symmetrical.

As shown in FIGS. 3 and 5, the attachment portion 71 is positioned along the lower surface 51 of the cab 5 and is fastened to the lower surface 51 of the cab 5 with bolts or the like inserted through the bolt insertion holes 75.
Alternatively, the attachment portion 71 may be directly welded to the lower surface 51 of the cab 5. The main body 72 may be a flat shape that can contact the bottom surface of the pallet 6. Such a main body 72 has an effect of closing the gap between the cab 5 and the pallet 6 when the pallet 6 is supported by the pallet holder 7, so that the small items placed on the pallet 6 at the time of picking work. Can be prevented from inadvertently dropping from between the cab 5 and the pallet 6. A stepped portion 76 between the attachment portion 71 and the main body portion 72 is formed to release the lower end of the main shaft 12 shown in FIG. 3 by making the main body portion 72 relatively lower than the attachment portion 71.

The front inclined edge 73 and the side inclined edge 74 may be omitted, but these have the following advantages. That is, as described above, the pallet 6 is supported by the fork 2 that protrudes straight ahead of the cab 5, and the pallet 6 is rotated about 90 ° counterclockwise or clockwise. It moves from the front of the cab 5 toward the cab 5. That is, it approaches the main body 72 while turning in the direction opposite to the direction indicated by the arrow F. If the bottom surface of the pallet 6 is positioned higher than the main body portion 72, the pallet 6 overlaps the pallet holder 7 as described above, but the bottom surface of the pallet 6 is equal to or slightly lower than the main body portion 72. In this case, the pallet 6 rides on the main body 72 while the bottom surface of the pallet 6 or the edge 61 thereof is in sliding contact with the front inclined edge 73. Therefore, it is possible to avoid the pallet 6 from colliding with the pallet holder 7 and to prevent the both from being damaged.

Further, as described above, the pallet 6 is supported by the fork 2 protruding right next to the cab 5, and in the process of shifting the fork 2, the pallet 6 moves along the vehicle width direction while the main body 7
Approach 2 If the bottom surface of the pallet 6 is positioned higher than the main body portion 72, the pallet 6 overlaps the pallet holder 7 as described above, but the bottom surface of the pallet 6 is equal to or slightly lower than the main body portion 72. In this case, the pallet 6 rides on the main body 72 while the bottom surface of the pallet 6 or the edge 61 thereof is in sliding contact with the side inclined edge 74. Therefore, as above,
Damage to the pallet 6 and the pallet holder 7 can be prevented.

6A and 6B illustrate a form in which the pallet receiver 7 is formed by arranging a plurality of small pieces at intervals in the vehicle width direction. In this case, the pallet receiving piece 70 shown in FIG. 1A corresponds to a portion surrounded by a virtual circle in FIG. A piece 70 that is geometrically approximately symmetrical to the tool piece 70 is attached. Between such pallet holder pieces 70 attached near both ends in the vehicle width direction, a pallet holder piece 700 as shown in FIG. .

Moreover, as shown to Fig.7 (a) thru | or (c), the piece 701 of steel materials whose cross-sectional shape is L-shaped,
It is good also as a mounting part which can be attached to the front of the cab 5, and the other piece 702 is good also as a main-body part which receives the bottom face of the pallet 6. FIG.

Further, as shown in FIGS. 8A to 8C, a pipe member 703, a rod member 704, or a member 705 having an arcuate cross section is joined to the front surface 52 of the cab 5 shown in FIG. 2 by welding or the like. A pallet receiver may be configured. In this case, when the bottom surface of the pallet 6 is located at the same level or slightly lower than the main body 72, the bottom surface of the pallet 6 or the edge thereof travels along the curved surface of the pipe member 703, the bar member 704, or the member 705 having a circular cross section. Thus, it is possible to prevent the damage caused by the collision between the pallet 6 and the pallet holder.

It should be noted that the present invention can be implemented in a mode in which various improvements, modifications, or variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. For example, as the material of the pallet receiving piece, synthetic resin having elasticity, wood, aluminum, or the like may be applied.

The present invention supports the pallet supported by the fork by the pallet holder provided at the front edge of the driver's cab, which is useful for preventing inadvertent inclination of the pallet and accompanying load collapse.

1 is a perspective view of a three-way stacking track according to an embodiment of the present invention. The side view of the three-way stacking track which concerns on embodiment of this invention. The side view which fractured | ruptured the principal part of the three-way stacking track which concerns on embodiment of this invention. The top view which shows the operation example of the three-way stacking track which concerns on embodiment of this invention. The perspective view which fractured | ruptured a part of pallet holder which concerns on embodiment of this invention. (A) is a perspective view which shows the 1st example of the pallet holder which concerns on embodiment of this invention, (b) is a perspective view of the modification. (A) is a perspective view which shows the 2nd example of the pallet holder which concerns on embodiment of this invention, (b) is a perspective view of the modification, (c) The perspective view of the further modification. (A) is a perspective view which shows the 3rd example of the pallet holder which concerns on embodiment of this invention, (b) is a perspective view of the modification, (c) The perspective view of the further modification.

Explanation of symbols

1: 3-way stacking truck 2: Fork 3: Upright shaft 4: Lifting carriage 5: Driver's cab 6: Pallet 7: Pallet holder 8: Traverse guide rail 9: Rack gear 10: Shift drive 18: Second hydraulic motor ( Slewing drive)
19: Longitudinal guide rail 71: Mounting portion 72: Body portion 73: Front inclined edge 74: Side inclined edge

Claims (6)

A mast erected on the vehicle body, a cab arranged on the front side of the vehicle body and moved up and down along the mast, and provided on the front side of the cab and moved up and down, left and right and around a vertical axis A three-way stacking truck comprising a fork to be turned and performing a cargo handling operation on the front side and the left and right sides of the vehicle body,
A three-way stacking truck, wherein the cab is provided with a pallet support for supporting the bottom surface of the pallet when the fork is directed leftward or rightward. The three-way stacking truck according to claim 1, wherein the pallet holder is provided at a front edge of the cab. 3. The three-way stacking truck according to claim 1, wherein the pallet holder is made of a long material attached along a width direction of the cab. 3. The three-way stacking truck according to claim 1, wherein the pallet holder is made of a plurality of short materials attached at intervals along the width direction of the cab. The pallet holder includes an attachment portion attached to the cab, a main body portion extending forward of the cab, and a front inclined edge inclined downward from the main body portion toward the front. The three-way stacking track according to any one of claims 1 to 4. 6. The three-way stacking truck according to claim 5, wherein the pallet holder includes a side inclined edge that is inclined downward from the main body portion in a width direction of the driver's cab.

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