JPH0759477B2 - Forklift shift fork device - Google Patents

Description

The present invention relates to a shift fork device for a forklift.

(B) Prior Art As a conventional forklift shift fork device, there is one disclosed in Japanese Patent Laid-Open No. 60-67399. The shift fork device of the forklift shown in the drawing has upper and lower finger bars fixed to a vertically moving member,
It has a guide rod fixed to the finger bar, a pair of forks movable along the guide rod, and a pair of shift cylinders for driving the pair of forks, respectively. By operating the shift cylinder, it is possible to realize a clamp function of sandwiching a load or the like between a pair of forks and a side shift function of laterally moving the fork while holding the load.

(C) Problems to be Solved by the Invention However, the conventional shift fork device for a forklift as described above has a problem that the forward field of view is limited by the shift cylinder. That is, the two shift cylinders are arranged adjacent to the upper finger bar and the lower finger bar in parallel with each other with a predetermined clearance in the vertical direction. Visibility is limited. For this reason, even if it is not, the forward view of the narrow forklift is further narrowed. The present invention aims to solve such problems.

(D) Means for Solving the Problems The present invention provides an upper finger bar and a lower finger bar which are parallel to each other and which are connected to a vertically moving member, a plurality of brackets which are connected to both finger bars, and the bracket. A pair of forks that are guided by the upper guide shaft and the lower guide shaft and that are horizontally movable, and a pair of forks that are fixed to the upper finger bar, the lower finger bar, or the bracket to drive each fork. A shift fork device for a forklift having a shift cylinder, wherein the upper finger bar and the lower finger bar are L-shaped cross-section members, and the upper finger bar is upward and downward with respect to the vertically moving member. The finger bar is fixed downward, and the upper guide shaft is fixed to the upper finger. The lower guide shaft is supported by the bracket on the upper side of the upper finger bar, and the lower guide shaft is supported by the bracket on the lower side of the lower finger bar. They are arranged at substantially the same height so that they overlap each other when viewed from the seat side.

(Operation) Since the two shift cylinders overlap each other when viewed from the driver's seat and are arranged near the lower surface of the upper finger bar, the forward view from the driver's seat is almost the projected area of one cylinder, and Only the field of view close to the upper finger bar is limited, so that a wide field of view is secured between the upper finger bar and the lower finger bar, and the driving operability of the forklift is significantly improved.

Moreover, the L-shaped cross sections of the upper finger bar and the lower finger bar on which a load such as a load is applied via the shift fork are fixed upward and downward with respect to each other. Work more advantageously, and the durability strength is increased.

(F) Example An example of the present invention is shown in FIGS. An upper finger bar 12 and a lower finger bar 14 are connected to a member 10 which moves up and down by a mechanism (not shown) so as to be parallel to each other in the vertical direction. The upper finger bar 12 and the lower finger bar 14 are composed of members having an L-shaped cross section.
The V-shaped cross-sectional shape is arranged in the direction shown in FIG. Side brackets 16 and 18 are fixed to both ends of the upper finger bar 12 and the lower finger bar 14, respectively. Further, intermediate brackets 20 and 22 are fixed to the axial center portions of the upper finger bar 12 and the lower finger bar 14. A guide rod 24 is fixed between the side bracket 16 on the upper finger bar 12 side and the intermediate bracket 20, and a guide rod 26 is fixed between the side bracket 18 and the intermediate bracket 20. In addition, the side bracket 16 on the lower finger bar 14 side and the intermediate bracket
A guide rod 28 is fixed between the side bracket 18 and the intermediate bracket 22, and a guide rod 30 is fixed between the side bracket 18 and the intermediate bracket 22. A fork 32, which is guided by the guide rod 24 and the guide rod 28 and is movable in the horizontal direction, is provided, and the guide rod 26 and the guide rod 30 are provided.
A similar fork 34 guided by is provided. The fork 32 can be driven by the shift cylinder 36, and the fork 34 can be driven by the shift cylinder 38. The body side of the shift cylinder 36 is fixed to the side bracket 16, and the piston rod 36a is connected to the fork 32. The body side of the shift cylinder 38 is fixed to the side bracket 18, and the piston rod 38a is connected to the fork 34. The shift cylinder 36 and the shift cylinder 38 are arranged at substantially the same height direction position as shown in FIG. 2, and when viewed from the driver's seat side, the shift cylinder 36 and the shift cylinder 38 overlap each other.

Next, the operation of this embodiment will be described. By operating the shift cylinder 36 and the shift cylinder 38, the forks 32 and 34 can be moved in the horizontal direction. Accordingly, it is possible to achieve a clamp function of sandwiching a load or the like between the forks 32 and the forks 34 and a side shift function of laterally moving the load while sandwiching the load. The shift cylinder 36 and the shift cylinder 38 are arranged so as to be substantially parallel to the horizontal direction as shown in FIG. 2, and when viewed from the driver's seat of the forklift,
The two are almost in the overlapping state. Therefore, the projected area for one shift cylinder 38 only obstructs the forward field of view, and the forward field of view for the shift cylinder 36 is expanded as compared with the conventional one.

Further, in this embodiment, the upper finger bar 12 and the lower finger bar 14 are composed of members having an L-shaped cross section, and the necessary strength can be secured with a relatively small size. Therefore, the size in the height direction can be reduced as compared with the case where the finger bar having the rectangular cross section is used, and the front view is improved also from this aspect. Further, since the wall thickness of the finger bar can be reduced, the weight is also reduced. Further, the arrangement of the L-shaped cross sections of the upper finger bar 12 and the lower finger bar 14 is
As shown in FIG. 3, the respective directions are advantageous with respect to the input F.

(G) Effect of the Invention As described above, according to the present invention, the two shift cylinders overlap each other when viewed from the driver's seat and are arranged near the lower surface of the upper finger bar, so that the front view from the driver's seat is reduced. , Only the projected area of approximately one cylinder, and only the field of view near the upper finger bar is limited, so that a wide field of view is secured between the upper finger bar and the lower finger bar, While the operability of the forklift is significantly improved, the L-shaped cross sections of the upper finger bar and the lower finger bar, on which the load such as luggage is applied via the shift fork, are fixed so that the L-shaped cross sections face upward and downward. Therefore, there is an effect that the strength is advantageously exerted against the stress due to the load, and the durability strength is enhanced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, FIG. 2 is a view taken along line II-II of FIG. 1, and FIG. 3 is a view showing an input state to a finger bar. 10 …… Member, 12 …… Upper finger bar, 14 …… Lower finger bar, 16,18 …… Side bracket, 20,22 ……
Intermediate bracket, 24,26,28,30 …… Guide rod, 32,34
...... Fork, 36,38 …… Shift cylinder.

Claims (1)

[Claims] 1. An upper finger bar and a lower finger bar, which are parallel to each other, connected to a vertically movable member, a plurality of brackets connected to both finger bars, an upper guide shaft and a lower side supported by the brackets. Shifting of a forklift having a pair of forks guided by a guide shaft and movable in the horizontal direction, and a pair of shift cylinders fixed to the upper finger bar, the lower finger bar or the bracket so as to drive each fork. In the fork device, the upper finger bar and the lower finger bar are composed of L-shaped cross-section members, and the upper finger bar is fixed upward and the lower finger bar is fixed downward with respect to the vertically moving member. The upper guide shaft is bracketed above the upper finger bar. While the lower guide shaft is supported by the bracket on the lower side of the lower finger bar, the pair of shift cylinders are located near the lower surface of the upper finger bar and viewed from the forklift driver's side. Shift fork device for a forklift, wherein the shift fork devices are arranged at substantially the same height so as to overlap each other.