JP3827292B2 - Forklift pallet lock device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pallet locking device for a forklift that locks a pallet lifted by a fork so that it is not accidentally displaced on the pallet during transportation.
[0002]
[Prior art]
Conventionally, an example of a reach type forklift is shown in FIG. This includes a vehicle body 1 having a drive tire 1a and a caster tire 1b, and a straddle leg 1A with a pair of left and right road wheels 1c protruding forward from the front lower end of the vehicle body 1, and a pair of left and right outer masts 2 By engaging the wheel 3 provided at the lower end with a guide groove 4 formed on the inner surface of each straddle leg 1A, each outer mast 2 is formed to be movable in the front-rear directions a and b. A lift bracket 6 is arranged to be movable up and down on a pair of left and right inner masts 5 engaged so as to be movable up and down, and a lift cylinder 7 for raising and lowering both the inner mast 5 and the lift bracket 6 is arranged along the masts 2 and 5. The pivot frame 9 is rotatably supported by the lift bracket 6 via the support shaft 8, and a pair of left and right forks 10 disposed on the front surface of the pivot frame 9 is provided in front. A tilt device 11, which is supported by the support shaft 8 so as to be able to rotate and tilts both forks 10 in the vertical directions c and d via a tilt bar 9 a installed on the rotation frame 9, is attached to the lift bracket 6. Is provided.
[0003]
In the above configuration, when carrying out the cargo handling work, the fork 10 is lowered (see the two-dot chain line in FIG. 12), and the masts 2 and 5 are moved forward a to move the tip of the fork 10 in a horizontal state. The load W is lifted through the pallet P by inserting it into the hole Pa of the pallet P (see the dashed line in FIG. 12) and raising the fork 10. Thereafter, the tilt device 11 is driven to tilt the fork 10 upward c, so that the load W is tilted toward the backrest 9b of the rotating frame 9 and the vehicle body 1 is moved to bring the load W to a predetermined position. It is designed to be transported.
[0004]
[Problems to be solved by the invention]
In the above-described conventional configuration, when the fork 10 lifts and transports the load W via the pallet P, the transport operation is performed in a place where condensation is likely to occur on the pallet P, such as in a freezer, or a composition with a small friction coefficient. When the resin pallet P is used, the pallet P may slide on the fork 10 and shift its position, resulting in load collapse.
[0005]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional drawbacks, and an object of the present invention is to provide a pallet locking device for a forklift that locks a pallet lifted by a fork so as not to be displaced unexpectedly.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, as a first invention, a mast erected on a vehicle body, a lift bracket lifted along the mast, a fork supported by the lift bracket, and the lift bracket are provided. In a forklift having a tilt device for tilting the fork, the lock bar is inserted into the hole of the pallet together with the fork by fixing the lock bar so as to protrude from the lift bracket to the fork side between the forks. A forklift characterized in that when the tilting device is tilted upward by the tilt device, the lower deck board of the pallet inserted into the fork is pressed against the lock bar from the inside . A pallet locking device is provided.
[0007]
The first invention is directed to a forklift provided with a lift bracket for tilting a fork, and by fixing a lock bar so as to protrude from the lift bracket toward the fork. When the fork tilts upward, the pallet is pressed by the lock bar coming into contact with the pallet inserted into the fork. Forklifts usually run and turn with the tip of the fork lifted up by a tilt device, so that the pallet can be locked on the fork by allowing the pallet to be locked while the fork is tilted upward. Can be prevented. Moreover, the lock bar is simply fixed to the lift bracket, and it is not necessary to provide a drive means such as an electric type or a hydraulic type, so that the lock bar can be constituted by a very simple means. In the first invention, the lock bar may be singular or plural, and may be rod-shaped or bowl-shaped. In the case of a rod shape, it is convenient to press contact with the pallet, and in the case of a bowl shape, it is convenient to engage with the unevenness or hole of the pallet.
[0008]
According to the first invention , in the pallet having deck boards on both upper and lower sides, the upper deck board of the pallet is pressed from below by the fork, and the lower deck board of the pallet is pressed from above by the lock bar. Thus, the pallet can be reliably prevented from slipping. In this case, since the lock bar is inserted into the hole of the pallet, there is no obstacle to placing the load on the pallet, and the load can be loaded up to the full pallet.
[0009]
According to a second aspect of the present invention, there is provided a pallet locking device for a forklift according to the first aspect, wherein both the fork and the lock bar can be adjusted in the lateral direction of the vehicle body.
[0010]
According to the second aspect of the present invention , the fork can be reliably inserted into pallets of different sizes and various pallets with different hole positions, and the position of the pallet pressing lock bar can be freely adjusted. Thus, interference with the pallet can be avoided, and a stable pallet locking operation can be always achieved by setting an optimum position. In the third aspect of the invention, the position of the lock bar can be adjusted in the left-right direction of the vehicle body. However, according to the vertical size of the hole in the pallet, the lock bar mounting position or its tip position can be changed in the vertical direction. This is also the expectation of the present invention. For this purpose, various known means can be used, such as making the lock bar up-and-down sliding, changing the mounting angle or its shape, or replacing it.
[0011]
A third aspect of the invention is the forklift pallet according to the first or second aspect of the invention , wherein the surface of the lock bar that contacts the pallet is treated to increase the frictional force against the pallet. A locking device is provided.
[0012]
According to the third aspect of the present invention , the frictional engagement force between the lock bar and the pallet is increased, and it is possible to more effectively suppress the pallet slipping on the fork. Here, the process for increasing the frictional force refers to a process such as forming irregularities on the lock bar or attaching rubber or a flexible resin.
[0013]
According to a fourth aspect of the present invention, there is provided a pallet lock device for a forklift, wherein the lock bar includes an elastic member in the first to third aspects of the invention .
[0014]
According to the fourth aspect of the invention , since the lock bar includes the elastic member, the pallet can be pressed using the elastic force of the elastic member, and the pallet can be locked with an appropriate force. It becomes.
[0015]
As a fifth invention, there is provided a pallet locking device for a forklift according to the first to fourth inventions , wherein the forklift is a reach-type forklift supported so that the mast is movable in the longitudinal direction of the vehicle body. To do.
[0016]
According to the fifth aspect of the invention , since the tilt bracket for tilting the fork is usually provided in the lift bracket in the reach type forklift, only a simple member such as a lock bar is attached to such an existing reach type forklift. Thus, a pallet lock function can be easily added.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a pallet locking device for a reach-type forklift according to a first embodiment of the present invention, and a pair of left and right lock bars 13 projecting from a lift bracket 6 toward the fork 10 are provided. Since the configuration other than the above is substantially the same as the configuration shown in FIG. 12, the same reference numerals are given to the same portions, and the description thereof is omitted.
[0018]
As shown in FIGS. 2 to 4, each of the lock bars 13 includes a square steel bar main body 13a extending in the front-rear directions a and b, a rising portion 13b extending upward from a base end of the bar main body 13a, and the rising The horizontal base end portion 13c extends in the opposite direction from the bar main body 13a from the upper end of the portion 13b. The horizontal base end portion 13c is brought into contact with a horizontal girder 6a installed on the lower end of the lift bracket 6, Each lock bar 13 is fixed to the lift bracket 6 by screwing a bolt 15 into the screw hole 14 of the cross beam 6a through the base end portion 13c. In the fixed state of the lock bar 13, the bar main body 13a is substantially horizontal and its lower surface 13A is positioned flush with or slightly above the lower surface 10a of the fork 10.
[0019]
In FIGS. 2 and 4, reference numeral 17 denotes a support beam installed on the upper end of the lift bracket 6, and the support shaft 8 is rotatably supported by bearings 18 fixed to both ends and the center of the support beam 17. Reference numeral 19 denotes a positioning pin that engages with the upper-end concave portion of each fork 10 through a through hole 20 provided in the support beam 17. Reference numerals 21a and 21b are guide rollers rotatably provided on both side surfaces of the lift bracket 6. The guide rollers 21a and 21b are in contact with the inner side surface and the bottom surface of each inner mast 5 to support the lift bracket 6 so as to be movable up and down.
[0020]
In the above configuration, when carrying out the cargo handling operation, the fork 10 is lowered (see the two-dot chain line in FIG. 1), and the masts 2 and 5 are moved forward a to move the tip of the fork 10 in a horizontal state. It inserts in the hole Pa of the pallet P (refer the dashed-dotted line of FIG. 1). In this case, since the tip of the fork 10 and the lock bar 13 are at substantially the same horizontal level, the fork 10 and the lock bar 13 can be easily inserted into the hole Pa of the pallet P (see FIG. 4).
[0021]
Next, the fork 10 is lifted to lift the load W through the pallet P, and the tilt device 11 is driven to tilt the fork 10 upward c so that the load W is moved to the backrest 9b side of the rotating frame 9. Tilt to. Thereby, as shown in FIG. 5, the lower deck board P2 of the pallet P is pressed against the tip of the lock bar 13, and the pallet P is locked. Subsequently, by traveling the vehicle body 1, the load W is conveyed to a predetermined position.
[0022]
According to the above configuration, by pressing the upper deck board P1 of the pallet P from below with the fork 10 and the lower deck board P2 of the pallet P from above with the lock bar 13 (see FIG. 5), the pallet P can be reliably prevented from slipping. In this way, since the lock bar 13 is inserted into the hole Pa of the pallet P, there is nothing in the way of placing the load W on the pallet P, and the load W is loaded until the pallet P is full. can do. Furthermore, the lock bar 13 is simply fixed to the cross beam 6a of the lift bracket 6, and there is no need to provide an electric or hydraulic drive means, and the lock bar 13 is simply attached to an existing reach-type forklift. Therefore, a pallet lock function can be added, and the production cost is low. When the fork is tilted downward, the tilt angle is generally smaller than that of the upward tilt described above. Therefore, by appropriately setting the shape of the lock bar 13, the lock bar 13 is moved to the pallet P. Never touch. For this reason, you may make it provide this lock bar 13 inclining a little downward.
[0023]
As shown in FIG. 2, a plurality of screw holes 14 are provided in the cross beam 6a of the lift bracket 6 with a predetermined interval h, and the through holes of the lock bars 13 are aligned with the appropriate screw holes 14. By screwing the bolts 15, the distance α between the lock bars 13 can be adjusted along the left-right direction of the vehicle body. Further, a plurality of through holes 20 are provided in the support beam 17 of the lift bracket 6 with a predetermined interval k, and the positioning pins 19 are engaged with the upper end recesses of the forks 10 through the appropriate through holes 20. By doing so, the distance β between the forks 10 can be adjusted along the left-right direction of the vehicle body.
[0024]
According to the above configuration, the fork 10 can be reliably inserted into the pallets P having different sizes and various pallets P having different positions of the holes Pa, and the position of the lock bar 13 for pressing the pallet can be freely adjusted. By doing so, interference with the pallet P can be avoided, and by setting an optimum position, a stable pallet locking action can be always achieved.
[0025]
As shown in FIG. 6, an anti-slip recess (or projection) 23 is formed on the lower surface 13A of the bar main body 13a of the lock bar 13, or as shown in FIG. It is preferable to attach a friction mat 24 having a large friction coefficient such as a simple resin.
[0026]
According to the above configuration, the surface of the lock bar 13 that contacts the lower deck board P2 of the pallet P is subjected to a process for increasing the frictional force against the pallet P. The frictional engagement force between the pallets P increases and the slip of the pallet P on the fork 10 can be further effectively suppressed.
[0027]
FIGS. 8 to 11 show a pallet locking device for a reach-type forklift according to a second embodiment of the present invention, in which a cylindrical projection 25a projects from the end face of the rising portion 13b of each lock bar 13. FIG. The annular ring 25b is externally fitted to the protrusion 25a via the proximal end of the bar body 13a made of a coil spring (elastic member), so that the proximal end of the coil spring bar body 13a rises. It is integrally connected to the portion 13b. Since the configuration other than the above is substantially the same as that of the first embodiment shown in FIGS. 1 to 4, the same parts are denoted by the same reference numerals and the description thereof is omitted.
[0028]
According to the above configuration, as shown in FIG. 11, when the tilt device 11 is driven to tilt the fork 10 upward c, the pallet is made by using the elastic force of the coil spring bar body 13a of each lock bar 13. The lower deck board P2 of P can be pressed, and pallet locking with an appropriate force becomes possible. The lock bar 13 has an advantage that the lower deck board P2 can be pressed regardless of the vertical size of the pallet P.
[0029]
In the first and second embodiments, the case where two lock bars 13 are provided has been described as an example. However, only one lock bar 13 or three or more lock bars 13 may be provided. Although a rod-shaped body is shown as the main body 13a, it may be a bowl-shaped body. In the case of a rod shape, it is convenient to press contact with the pallet P, and in the case of a bowl shape, it is convenient to engage with the unevenness or hole of the pallet P. Furthermore, the reach type forklift has been described as an example, but the present invention is not limited to this, and can be applied to various forklifts.
[0030]
【The invention's effect】
According to the first invention, the tilt device for tilting the fork is intended for a forklift provided on the lift bracket, and the tilt bar is fixed so as to protrude from the lift bracket toward the fork. Accordingly, when the fork tilts upward, the lock bar is brought into contact with the pallet inserted into the fork, thereby pressing the pallet. Forklifts usually run and turn while the fork tip is lifted by a tilt device, so that the pallet can be locked while the fork is tilted upward, thereby preventing the pallet from sliding on the fork. Can be prevented. Moreover, the lock bar is simply fixed to the lift bracket, and it is not necessary to provide a drive means such as an electric type or a hydraulic type, so that the lock bar can be constituted by a very simple means. In the first invention, the lock bar may be singular or plural, and may be rod-shaped or bowl-shaped. In the case of a rod shape, it is convenient to press contact with the pallet, and in the case of a bowl shape, it is convenient to engage with the unevenness or hole of the pallet.
[0031]
According to the first invention , in the pallet having deck boards on both upper and lower surfaces, the upper deck board of the pallet is pressed from below with a fork, and the lower deck board of the pallet is pressed from above with a lock bar. The pallet can be reliably prevented from slipping. In this case, since the lock bar is inserted into the hole of the pallet, there is no obstacle to placing the load on the pallet, and the load can be loaded up to the full pallet.
[0032]
According to the second invention , the fork can be surely inserted into pallets with different sizes and various pallets with different hole positions, and the lock bar for pressing the pallet can be freely adjusted. Interference with the pallet can be avoided, and a stable pallet locking action can always be achieved by setting the optimum position.
[0033]
According to the third invention , the frictional engagement force between the lock bar and the pallet is increased, and the slippage of the pallet on the fork can be further effectively suppressed. Here, the process for increasing the frictional force refers to a process such as forming irregularities on the lock bar or sticking rubber or a flexible resin.
[0034]
According to the fourth invention , since the lock bar includes the elastic member, the pallet can be pressed using the elastic force of the elastic member, and the pallet can be locked with an appropriate force. Become.
[0035]
According to the fifth invention , a pallet lock function can be added simply by attaching a lock bar to an existing reach-type forklift, and the production cost is low.
[Brief description of the drawings]
FIG. 1 is a side view showing a pallet lock device for a reach-type forklift according to a first embodiment of the present invention.
FIG. 2 is a front view of the same.
FIG. 3 is a perspective view of the main part.
4 is an AA arrow view of FIG. 2;
FIG. 5 is a longitudinal sectional view of the main part in a tilted state of the fork.
FIG. 6 is a partially cutaway side view showing an example of a modification of the lock bar.
FIG. 7 is a partially cutaway side view showing another example of the deformation of the lock bar.
FIG. 8 is a perspective view of an essential part showing a pallet locking device of a reach-type forklift that is a second embodiment of the present invention.
9 is a BB arrow view of FIG. 8. FIG.
10 is a view taken along the line CC in FIG. 9;
FIG. 11 is a longitudinal sectional view of the main part in a tilted state of the fork.
FIG. 12 is a side view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Car body 2, 5 Mast 6 Lift bracket 10 Fork 11 Tilt device 13 Lock bar 23 Recess 24 Friction mats a and b P-direction P Pallet Pallet hole P1 Pallet upper deck board P2 Pallet lower deck board

Claims (5)

In a forklift having a mast erected on a vehicle body, a lift bracket that is raised and lowered along the mast, a fork supported by the lift bracket, and a tilt device that is provided on the lift bracket and tilts the fork. A lock bar is fixed between the forks so as to protrude from the lift bracket to the fork side, so that the lock bar is inserted into the hole of the pallet together with the fork, and above the fork by the tilt device. A pallet locking device for a forklift , wherein the lock bar abuts against and presses the lower deck board of the pallet inserted into the fork when tilted . The pallet locking device for a forklift according to claim 1 , wherein both the fork and the lock bar can be adjusted in a lateral direction of the vehicle body. The pallet locking device for a forklift according to any one of claims 1 and 2 , wherein the surface of the lock bar that contacts the pallet is subjected to a treatment for increasing a frictional force against the pallet. The pallet locking device for a forklift according to any one of claims 1 to 3, wherein the lock bar includes an elastic member. The pallet locking device for a forklift according to any one of claims 1 to 4, wherein the forklift is a reach-type forklift in which the mast is supported so as to be movable in a longitudinal direction of a vehicle body.

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