JP2000327290A - Side shift device for forklift truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a side shift device for a forklift truck capable of preventing floating of a shifter to ensure smooth shifting operation. SOLUTION: In a side shift device in which a pair of sideways long, upper and lower finger bars 2, 3 are firmly locked to the front face of a lift bracket 1 capable of being raised and lowered, and a pair of upper and lower shifter bars 6, 7 for supporting a fork 4 are engaged with the finger bars 2, 3 so that they can travel sideways, an engaging projected part 2a of the upper side finger bar 2 is formed into a shape of rectangular cross section, the rear face of the which forms a upright face crossing the upper face at angle of 90 degrees. Then, an engaging recessed part 6a formed in the upper side shifter bar 6 is engaged with the engaging projected part 2a so as to cover it, through an upper liner 9 to execute shifting operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a side shift device of a forklift capable of moving an attachment such as a fork in a vehicle width direction along a finger bar fixed to a front surface of a lift bracket.

[0002]

2. Description of the Related Art As shown in FIG. 9, a conventional general forklift side shift device includes a pair of upper and lower fingers fixed to a front surface of a lift bracket 101 which is moved up and down along a mast (not shown) of a forklift. Bar 1
02, 103, fork 10 as an attachment
4 is mounted so as to be movable in the vehicle width direction via a shifter 105 and is shifted by a shift cylinder 111. The shifter 105 includes an upper shifter bar 106 that is engaged with the upper finger bar 102 via a substantially L-shaped upper liner 109, and a lower shifter bar 107 that is in contact with the front surface of the lower finger bar 103 via a lower liner 110. And right and left vertical plates 108 for connecting the shifter bars 106 and 107 to each other. Upper shifter bar 106 is reverse L
The upper finger bar 102 is engaged with an engaging projection 102a formed on the upper finger bar 102 from above and performs a shift operation with the upper surface and the inclined rear surface as sliding surfaces. The shift operation is performed with the front surface as a sliding surface.

By the way, upper and lower finger bars 102,
In the case of a standard vehicle in which the fork 104 is directly attached to the 103, the standard specifies that the rear surface of the engaging projection 102a of the upper finger bar 102 is inclined forward at a specified angle. Therefore, when the side shift device as an attachment is provided, since the standard vehicle is used as a base, the engagement between the upper finger bar 102 and the upper shifter bar 106 is naturally inclined. On the other hand, the lower shifter bar 107 is provided with two left and right hooks 107 a for retaining the hooks, and the hooks 107 a are set to have a predetermined gap C with respect to the lower finger bar 103.

[0004]

In the case of a side shift device having a structure in which the rear surface of the engaging projection 102a of the upper finger bar 102 is formed as an inclined surface, as shown in FIG. Component force is upper finger bar 10
Acting as a force w that pushes down the upper shifter bar 106 and the upper liner 109 along the slope 2. On the other hand, a moment in the downward tilting direction (downward) due to the loaded load acts on the fork 104, and the rearward force acts on the lower shifter bar 107 by this moment, and the forward force F acts on the upper shifter bar 106. Works. The component force of the forward force F acting on the upper shifter bar 106 is applied to the engagement recess 1 of the finger bar 102.
Acting as a force f for lifting the upper shifter bar 106 and the upper liner 109 along the slope of 02a.
For this reason, for example, when the shifter 105 is provided with the long fork 104 longer than the standard, the load center becomes large, and accordingly, the moment acting on the fork 104 also becomes large. In this connection, if the force f for lifting the upper liner 109 exceeds the force w for pushing down, the shifter 105 is lifted as shown in FIG. As a result, lower shift bar 107
The hook 107a contacts the lower finger bar 103, causing a shift failure.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a side of a forklift capable of preventing a shifter from floating and ensuring a smooth shift operation. A shift device is provided.

[0006]

Means for Solving the Problems To achieve the above object, a forklift side shift device according to the present invention has a configuration as described in each of the claims. Therefore, according to the first aspect of the present invention, the finger bar is provided with an engagement protrusion having a rectangular cross section having a rear surface substantially upright, and the shifter bar is provided on at least the upper surface and the rear surface of the engagement protrusion via a liner. With the configuration in which the shifter bar and the liner are engaged with each other, a force for lifting the shifter bar and the liner is not generated. For this reason, the lifting phenomenon of the shifter is prevented, and a smooth shift operation of the shifter is ensured.

According to the second aspect of the present invention, since the engagement concave portion having a gate-shaped cross section provided on the shifter bar is engaged so as to cover the engagement convex portion of the finger bar from above, the shifter bar has On the other hand, even when an external force is applied not only from the rear but also from the front, movement of the shifter bar to the rear is restricted. Therefore, in addition to preventing the shifter bar from being lifted, the engagement state is ensured by restricting the movement in the front-rear direction, thereby preventing an accidental disengagement accident.

According to the third aspect of the present invention, since the engaging recess of the upper shifter bar is formed in an H-shaped cross section, the bending rigidity in the vertical direction can be increased.
This makes it possible to reduce the thickness of the shifter bar while securing the required rigidity. As a result, the weight of the side shift device can be reduced. In addition, since the hooking position of the attachment is set closer to the vehicle due to the H-shaped cross section, the thickness of the side shift device in the front-rear direction can be reduced to increase the allowable load.

According to the fourth aspect of the present invention, since the upper and lower shifter bars can be used (assembled) by being turned back and forth, the shifter bar can be applied as a common part of two types of forklifts having different vehicle grades. . That is, the parts can be shared, and the management of the parts is simplified.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. First, a side shift device of a forklift according to a first embodiment will be described with reference to FIGS. 1 is a front view of the side shift device, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a side view showing the upper finger bar. In FIG. 1, a pair of upper and lower finger bars 2 and 3 extending in the vehicle width direction are provided at a predetermined interval on the front surface of a lift bracket 1 which moves up and down along a mast (not shown) via a lift roller 1a. And fixed in parallel, on the front of the finger bars 2 and 3,
A shifter 5 for supporting a pair of left and right forks 4 as an attachment is arranged movably in the vehicle width direction. The shifter 5 is composed of a pair of upper and lower shifter bars 6 and 7 arranged in parallel at predetermined intervals vertically, and left and right vertical plates 8 connecting the shifter bars 6 and 7 to each other at both left and right ends. ing. As shown in FIG. 1, both shifter bars 6 and 7 are formed to be horizontally long so as to protrude from both ends of finger bars 2 and 3 in order to secure a predetermined shift amount.

As shown in the side view of FIG. 2, the upper shifter bar 6 (hereinafter referred to as upper shifter bar) is connected to the upper finger bar 2 (hereinafter referred to as upper finger bar) via an upper liner 9. It is engaged so as to cover from above. In the present embodiment, as shown in FIG. 3, the upper finger bar 2 is provided with an engagement projection 2a having a rectangular cross section on the upper side, and the rear surface of the engagement projection 2a is positioned above the horizontal upper surface. Upright surface (90 degrees). The upper shifter bar 6 (hereinafter, referred to as an upper shifter bar) has an engagement concave portion 6a on the rear side thereof, and the engagement concave portion 6a is provided on the upper and rear surfaces of the engagement convex portion 2a of the upper finger bar 2. It is engaged so as to cover from above through a substantially L-shaped upper liner 9.
Therefore, the upper shifter bar 6 performs a shift operation using the upper surface and the rear surface of the engaging projection 2a as sliding surfaces. Further, on the front side of the upper shifter bar 6, there is provided a latching projection 6b on which the upper hook 4a of the fork 4 is latched, and the rear surface of the latching projection 6b is inclined forward by a predetermined angle. .

On the other hand, the lower shifter bar 7 (hereinafter, referred to as a lower shifter bar) is engaged with the lower finger bar 3 (hereinafter, referred to as a lower finger bar) in a structure similar to the conventional structure. That is, the lower shift bar 7
On the rear surface side, a pair of left and right shifter plates 10 is provided. The shifter plate 10 is slidably abutted on the front surface of the lower finger bar 3 via a lower liner 11 made of a flat plate. 1
Lower hook 12 provided on the rear surface of
Are opposed to the lower engagement projection 3a of the lower finger bar 3 with a predetermined gap C left therebetween. The lower hook 4b of the fork 4 is hooked on the hooking projection 7a of the lower shifter bar 7. The shifter 5 attached to the finger bars 2 and 3 as described above is shifted by a hydraulic shift cylinder 13 in the vehicle width direction. As shown in FIG. 1, the shift cylinder 13 has a cylinder body connected to a bracket 14 fixed to the upper finger bar 2 by a pin 15 and a piston rod fixed to one of the vertical plates 8 of the shifter 5. Are connected by pins 17.

The side shift device according to the present embodiment is configured as described above. Therefore, when the fork 4 is loaded with a load, a moment in a downwardly inclined direction (forward downward) acts on the fork 4, and accordingly, the upper shifter bar 6 engages the upper finger bar 2 via the upper liner 9. It is pressed against the rear surface of the mating projection 2a. However, in the present embodiment, the engaging projection 2a of the upper finger bar 2 is formed in a rectangular cross section to form the engaging projection 2a.
Since the rear surface of a is an upright surface, a force for lifting the upper shifter bar 6 and the upper liner 9 is not generated. Therefore, the lifting phenomenon of the shifter 5 is prevented, and a smooth shift operation of the shifter 5 can be ensured.

Next, a second embodiment of the present invention will be described with reference to FIGS.
Explanation will be given based on FIG. In the second embodiment,
An upper shifter bar 6 and a lower shifter bar 7 of a shifter 5 are vertically arranged above the upper finger bar 2 and below the lower finger bar 3 which are fixed to the upper front surface of the lift bracket 1. The upper shifter bar 6 and the lower shifter bar 7 are connected to each other by left and right vertical plates 8. As shown in FIG. 5, an engagement protrusion 2 a having a rectangular cross-section is formed on the upper surface of the upper finger bar 2. . On the other hand, as shown in FIG. 6, the upper shifter bar 6 is formed in a substantially H-shaped section having concave portions on the upper and lower surfaces, and the concave portion on the lower surface side has a gate-shaped engagement corresponding to the engagement convex portion 2a. Recess 6a
And the convex portion forming the front wall of the upper surface side concave portion is a fork 4
Of the upper hook 4a. Then, as shown in FIG. 4, the engaging concave portion 6a of the upper shifter bar 6 is engaged with the engaging convex portion 2a via the concave upper liner 9 so as to cover the engaging convex portion 2a from above.
The shift operation is performed by using the upper surface and the front and rear surfaces of a as sliding surfaces.

On the other hand, as shown in FIG. 4, the lower shifter bar 7 is formed to have a substantially L-shaped cross section, and the upright portion is formed on the front surface of the finger bar 3 having a rectangular cross section.
It is slidably contacted via 1. The horizontal portion of the lower shifter bar 7 faces the lower surface of the lower finger bar 3 with a predetermined gap C therebetween, and the lower surface of the lower shift bar 7 engages with the engaging projection 7 with which the lower hook 4b of the fork 4 engages.
a. In addition, a hook 18 is provided on the upper front surface of the lower finger bar 3 for preventing the upper finger bar 3 from coming off and facing the front surface of the upright portion of the lower shifter bar 7 with an appropriate gap. The shifter 5 mounted as described above is shifted by the shift cylinder 13.

As described above, in the side shift device according to the second embodiment, the engaging recess 6a of the upper shifter bar 6 is formed in a substantially gate shape, and the engaging recess 6a is formed on the upper finger bar 2. Substantially rectangular engaging projection 2 formed
a, which is configured to be in close contact with the upper surface and the front and rear surfaces, respectively. Therefore, even when an external force is applied to the upper shifter bar 6 from any of the front and rear directions, the movement of the upper shifter bar 6 can be restricted. Therefore, as in the case of the first embodiment, it is possible to prevent the shifter 5 from lifting up and to ensure a smooth shift operation, and to restrict the movement in the front-rear direction to maintain the engaged state. Accidental withdrawal accidents can be prevented.

In the second embodiment, the lift bracket 1 is arranged vertically above the upper finger bar 2 and the lower shifter bar 7 below the lower finger bar 3. The distance from the front surface of the fork 4 to the rear surface of the fork 4, that is, the thickness of the side shift device in the front-rear direction can be reduced as compared with the related art. For this reason, the load center is reduced, and the allowable load can be increased. In the present embodiment, the bending rigidity of the upper shifter bar 6 can be increased by forming the upper shifter bar 6 to have an H-shaped cross section. This means that the upper shifter bar 6
It is possible to reduce the thickness of the side shift device while securing the necessary strength, which is useful for reducing the weight of the side shift device.

Next, a third embodiment of the present invention will be described with reference to FIGS. This embodiment is a modification of the above-described second embodiment. Fork is provided on the upper shifter bar 6 and the lower shifter bar 7 with the longitudinal axes PP of both shifter bars 6 and 7 interposed therebetween. By providing two large and small locking projections for hooking, the present invention can be applied to two large and small forklifts of different vehicle sizes.

More specifically, the upper shifter bar 6 is formed to have an H-shaped section, and the upper and lower front and rear sides of the longitudinal axis PP are provided with locking projections 6b and 6c for the upper hook 4a of the fork 4.
Are formed. The lower shifter bar 7 is formed to have an inverted T-shaped cross section, and similarly, engaging projections 7b, 7c for the lower hook 4b of the fork 4 are formed at the lower front and rear sides of the longitudinal axis PP. . The height and thickness of one of the latching projections 6b, 7b are set to dimensions corresponding to, for example, the forks 4 for 1 and 2 tons, and the other latching projection 6c is sandwiched by the vertical axis PP. , 7c are set to dimensions corresponding to the fork 4 for 3 tons. Further, a lower abutment is provided on the engagement concave portion 6a of the upper shifter bar 6 and the front surface of the lower finger bar 3 via the lower liner 11 to be engaged with the engagement projection 2a of the upper finger bar 2 via the upper liner 9. The engaging portion of the shifter bar 7 is formed symmetrically with respect to the longitudinal axis PP.

When the upper shifter bar 6 and the lower shifter bar 7 configured as described above are connected to each other by the left and right vertical plates 8, the vertical intervals thereof are 1 and 2.
It is set so as to correspond to the hook interval of the ton for fork or the hook interval of the fork for 3 ton.
FIG. 7 shows a case where the present invention is applied to a 1 and 2 ton forklift, and FIG. 8 shows a case where a 3 ton forklift is applied. Therefore, according to the third embodiment configured as described above, the upper and lower shifter bars 6 and 7 are
Common parts can be used for two types of forklifts having different vehicle grades, which helps to simplify parts management.

In the embodiment, the rear surface of the engaging projection 2a having a rectangular cross section provided on the upper finger bar 2 is an upright surface perpendicular to the horizontal upper surface, but is not necessarily limited to a right angle. If it is not a shape but a shape close to a right angle, a slight inclination is acceptable. In short, even if the lifting force of the upper shifter bar 6 is generated when the upper shifter bar 6 is pressed against the rear surface of the engaging projection 2a by the forward rotation moment acting on the attachment, the shifter 5 is not lifted. There is no problem if the inclination is such that only a slight lifting force is generated. In addition, this embodiment,
Although the description has been given of the case where the attachment is a fork, the attachment is not limited to this, and may be, for example, a clamp. Further, although the upper and lower finger bars 2 and 3 are used, a single plate may be used.

[0022]

As described in detail above, according to the present invention,
In the side shift device of the forklift, it is possible to prevent the shifter from rising and to ensure a smooth shift operation.

[Brief description of the drawings]

FIG. 1 is a front view showing a side shift device of a forklift according to a first embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a side view showing an upper finger bar.

FIG. 4 is a side sectional view of a side shift device according to a second embodiment.

FIG. 5 is a side view showing an upper finger bar.

FIG. 6 is a side view showing the upper shifter bar.

FIG. 7 is a side sectional view showing a side shift device according to a third embodiment, showing a case where the present invention is applied to a 1-ton and 2-ton forklift.

FIG. 8 is a side sectional view showing a side shift device according to a third embodiment, showing a case where the present invention is applied to a forklift for 3 tons.

FIG. 9 is a side sectional view showing a conventional side shift device.

FIG. 10 is an explanatory view showing a phenomenon in which an upper shifter bar is lifted.

FIG. 11 is a side sectional view showing the side shift device in a state where the shifter is raised.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lift bracket 2, 3 ... Finger bar 2a ... Engagement convex part 6a ... Engagement concave part 6b ... Hook convex part 4 ... Fork 5 ... Shifter 6, 7 ... Shifter bar

Claims (4)

[Claims] 1. A horizontally long finger bar is fixed to a front surface of a lift bracket that can move up and down along a mast, and a pair of upper and lower shifter bars that support an attachment are engaged with the finger bar so as to be movable in a vehicle width direction. A side shift device for a forklift having a structure as described above, wherein an engaging convex portion having a rectangular cross section having a rear surface substantially upright is formed at an upper portion of the finger bar, and the upper shifter bar has at least the engaging convex portion. A side shift device for a forklift configured to engage with an upper surface and a rear surface via a liner. 2. The side shift device for a forklift according to claim 1, wherein the engaging recess of the upper shifter bar engaged with the engaging projection of the finger bar is formed in a gate shape in cross section. A side shift device for a forklift configured to engage via a liner with an upper surface of a mating convex portion and front and rear substantially upright surfaces. 3. The side shift device for a forklift according to claim 1, wherein the upper shifter bar has an H-shaped cross section having concave portions on upper and lower surfaces, and the lower concave portion has an engagement convex portion of the finger bar. A side shift device of a forklift having an engaging concave portion engaged with the upper surface and the front and rear surfaces of the forklift, and an upper front convex portion having a latching convex portion for latching an upper hook of the attachment. 4. The side shift device for a forklift according to claim 1, wherein the upper and lower shifter bars are formed such that engagement portions with the finger bars are symmetrical with respect to the longitudinal axis. A side shift device for a forklift, which has two large and small projections symmetrically on the front and rear sides of the longitudinal axis for hooking the attachment.