JP2000044185A - Lift truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a guide roller projecting sideways from a vehicle body from being damaged caused by a collision to an obstacle. SOLUTION: In this lift truck, a guide roller 2a is rotatably provided on the tip of a pair of straddle legs 4 extended forward from both ends of the lower part of a vehicle body through a bracket 34, and respective guide rollers 2a are faced to guide rails when the vehicle body is moved on a passage between the guard rails. Steel-made projecting pieces 43 having approximately triangular shapes in plan view are formed near respective guide rollers 2a and on the side surfaces of the straddle legs 4, the projecting pieces 43 collide with an obstacle projecting from the guide rail to the passage to prevent the guide rollers 2a from colliding with the obstacle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lift truck provided with guide rollers for preventing meandering of a vehicle body at both front and rear ends of the vehicle body.

[0002]

2. Description of the Related Art A conventional lift truck of this type is disclosed in Japanese Patent Application Laid-Open No. Hei 5-170315. One example of such a lift truck will be described with reference to FIGS. Guide rollers 2 projecting laterally from the side surface of the vehicle body 2 at both front and rear ends of the vehicle
a and 2b are respectively provided. A lift device 3 is provided at a front portion of the vehicle body 2, and a pair of front and rear urethane rubber road wheels 5 are provided at front ends of a pair of straddle legs 4 extending forward from both lower sides of the vehicle body 2. Is provided.

The lift device 3 includes a plurality of (two in this embodiment) masts 10 and 11, an elevating body 12 movably provided on the elevating mast 11, and an elevating body 12.
A horizontal moving body 14 horizontally moved by a pair of upper and lower racks 13 provided on the front surface of the moving body, a revolving body 16 rotatable around a vertical axis 15 provided at a tip of the horizontal moving body 14, and fixed to the revolving body 16 And a pair of forks 17 that can be moved up and down in a state where the forks 17 are directed in three directions of forward and left and right (see phantom lines in FIGS. 6 and 7).
For example, as shown in FIG. 8, after the vehicle body 2 is moved forward or backward b to a predetermined position through a passage 19 between the storage shelves 18, the work W on the fork 17 is moved into a predetermined storage section 18 a of the storage shelf 18. The work W is carried out from the predetermined storage section 18a.

As shown in FIGS. 9 and 10, a pair of left and right support plates 22 projecting from the tip of the straddle leg 4 and a pair of inner and outer equalizers provided on each of the support plates 22 are shown in FIGS. It has a pair of front and rear support shafts 25 provided between the two equalizer mechanisms 23 and 24, and each load wheel 5 is rotatably fitted to each support shaft 25 via a bearing 26. Have been.

The guide rollers 2a at both ends of the front part are shown in FIG.
As shown in FIG. 10 and FIG. 10, the guide rollers 2b at both ends of the rear portion are rotatably supported by brackets 34 fixed to the distal ends of the support plates 22 by bolts 35.
As shown in FIG. 7, the guide rollers 2 a and 2 b are rotatably supported by a bracket 27 fixed to the rear side surface of the vehicle body 2, and when the vehicle body 2 meanders and deviates from the center of the passage 19. Strikes guardrails 20 (see FIG. 8) arranged along both side edges of the passage 19 to prevent an accident in which the vehicle body 2 comes into contact with the storage shelf 18 beforehand.

[0006]

In the above-mentioned conventional configuration,
As shown by the imaginary line in FIG. 10, when the guide rollers 2a and 2b collide with the guard rail 20, the seam between the straight part 20a and the corner part 20b of the guard rail 20 is shifted, and the end of the corner part 20b Is passage 19
When the vehicle body 2 that moves backward on the passage 19 in this state turns right or left at the entrance of the passage 19, the obstacle 20A protruding into the passage 19 from the guardrail 20. (See the phantom line in FIG. 8), the stepped portion 34a of the guide roller 2a or the bracket 34 collides with the obstacle 20A, which may damage the guide roller 2a or the bracket 34 (and the bolt 35). Was.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional drawbacks, an object of the present invention is to provide a lift truck in which a guide roller projecting laterally from a vehicle body is not damaged by colliding with an obstacle.

[0008]

According to a first aspect of the present invention, a guide roller is provided at each of both front and rear ends of a vehicle body so as to protrude laterally from a side surface of the vehicle body. When the vehicle body is moved on a path sandwiched by guard rails, in a lift truck in which each of the guide rollers is opposed to the guide rail, at least both front ends of the guide rollers A protection member for protecting the guide roller is protruded from the vehicle body, and the protection member hits an obstacle protruding into the passage from the guard rail so that the guide roller does not collide with the obstacle. I have.

According to the above construction, when the vehicle body is turned right or left at the entrance of the passage, even if there is an obstacle near the entrance, the protection member hits the obstacle. There is no risk of collision and damage.

According to a second aspect of the present invention, in the first aspect of the present invention, the protection member is provided so as to approach the guide roller and project toward the center of the vehicle body from the guide roller.

According to the above structure, when the vehicle body is turned right or left at the entrance of the passage, even if there is an obstacle near the entrance, the protection member surely hits the obstacle. There is no danger of collision and damage.

According to a third aspect of the present invention, in the second aspect of the present invention, the length of the protection member is set slightly shorter than the length of the guide roller.

According to the above configuration, since the guide roller protrudes laterally beyond the protection member, the protection member does not hinder the vehicle body meandering prevention function of the guide roller.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the guard rail facing surface of the protection member is inclined outwardly toward the guide roller.

According to the above configuration, the impact when the guardrail facing surface is brought into contact with the obstacle is reduced.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, the protection member comprises a steel projecting piece having a substantially triangular shape in a plan view.

According to the above configuration, since the steel protruding piece which is inexpensive and has excellent rigidity is used as the protection member, the guide roller can be reliably protected and the manufacturing cost is reduced.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the guide rollers at both ends of the front portion are provided with a bracket at a tip end of a pair of straddle legs extending forward from both lower sides of the vehicle body. The steel protruding piece is rotatably provided, and is protruded from a side surface of the straddle leg so as to approach the guide roller.

According to the above configuration, when the vehicle body is turned right or left at the entrance of the passage, even if there is an obstacle near the entrance, the steel projecting piece hits the obstacle.
There is no possibility that the guide roller and the bracket supporting the guide roller may be damaged by colliding with an obstacle.

The invention according to claim 7 is characterized in that, in the invention according to claim 6, the steel projecting piece is formed integrally with the bracket.

According to the above configuration, since the steel projecting piece is formed integrally with the bracket, the number of parts is reduced, and the manufacturing cost can be reduced.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show a main part of a lift truck according to an embodiment of the present invention, in which a protruding piece (protective member) 43 approaches a guide roller 2 a provided at the tip of each straddle leg 4. Is provided. In the configuration other than the above, the same parts as those of the conventional example shown in FIGS.

The protruding piece 43 is made of a steel plate having a substantially triangular shape in a plan view, and is projected from the side surface of the outer support plate 22 of the load wheel support device 6 provided at the tip of the straddle leg 4 by welding or the like.

According to the above configuration, when the vehicle body 2 traveling backward b on the passage 19 is turned right or left at the entrance of the passage 19 (see the phantom line in FIG. 8), the obstacle 20A is located near the entrance. Even so, since the guard rail facing surface 43a of the protruding piece 43 hits the obstacle 20A, there is no possibility that the guide roller 2a or the bracket 34 will be damaged by colliding with the obstacle 20A (see the phantom line in FIG. 3).

The projecting length h of the projecting piece 43 is set slightly shorter than the projecting length H of the guide roller 2a.
Since the guide roller 2a protrudes laterally beyond the protruding piece 43, the guide roller 2a does not hinder the body meandering prevention function.

Furthermore, the guard rail facing surface 4 of the projecting piece 43
3a is inclined outwardly toward the guide roller 2a, so that its guard rail facing surface 43a is
The impact at the time of hitting 0A can be reduced.

Further, since the protruding piece 43 is formed of a steel plate which is inexpensive and has excellent rigidity, the guide roller 2a can be surely protected and the manufacturing cost can be reduced.

FIGS. 4 and 5 show a main part of a lift truck according to another embodiment of the present invention. The projecting piece 43 is formed integrally with the bracket 34. FIG. Since the configuration other than the above is substantially the same as the embodiment of the present invention shown in FIGS. 1 to 3, the same reference numerals are given to the same portions, and the description thereof will be omitted.

According to the above configuration, since the projecting piece 43 is formed integrally with the bracket 34, the number of parts is reduced,
Production costs can be reduced.

In the above embodiment, the three-way fork 1
Although the lift truck provided with the lift device 3 having 7 has been described as an example, the present invention is not limited to this and can be applied to various lift trucks.

The guide rollers 2 at both ends of the front part of the vehicle body 2
Although the case where a is protected has been described as an example, the present invention can also be applied to a case where the guide rollers 2b at the rear ends of the vehicle body 2 are protected.

[0032]

According to the first aspect of the invention, when the vehicle body is turned right or left at the entrance of the passage, even if there is an obstacle near the entrance, the protection member hits the obstacle. In addition, there is no possibility that the guide roller collides with an obstacle and is damaged.

According to the second aspect of the invention, when the vehicle body is turned right or left at the entrance of the passage, even if there is an obstacle near the entrance, the protection member surely hits the obstacle. In addition, there is no possibility that the guide roller collides with an obstacle and is damaged.

According to the third aspect of the present invention, since the guide roller protrudes laterally beyond the protection member, the protection member does not hinder the vehicle body meandering prevention function of the guide roller.

According to the fourth aspect of the present invention, since the guard rail facing surface of the protection member is inclined so as to expand outward toward the guide roller, the impact when the guard rail facing surface is brought into contact with an obstacle is reduced. Is done.

According to the fifth aspect of the present invention, since the inexpensive and highly rigid steel projecting piece is used as the protection member,
The guide roller can be reliably protected, and the manufacturing cost is low.

According to the sixth aspect of the invention, when the vehicle body is turned right or left at the entrance of the passage, even if there is an obstacle near the entrance, the steel projecting piece hits the obstacle. In addition, there is no possibility that the guide roller or the bracket supporting the guide roller may be damaged by colliding with an obstacle.

According to the seventh aspect of the present invention, since the steel projecting piece is formed integrally with the bracket, the number of parts is reduced, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a lift truck according to an embodiment of the present invention.

FIG. 2 is a side view of the main part.

FIG. 3 is a plan view of the main part.

FIG. 4 is a side view showing a main part of a lift truck according to another embodiment of the present invention.

FIG. 5 is a plan view of the main part.

FIG. 6 is a side view of the lift truck.

FIG. 7 is a plan view of the lift truck.

FIG. 8 is a schematic plan view showing a state in which a work is stored by the lift truck.

FIG. 9 is a side view of a main part showing a conventional example.

FIG. 10 is a plan view of the essential part.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 2 Body 2a Guide rollers at both ends of front part 2b Guide rollers at both ends of rear part 4 Straddle leg 19 Passage 20 Guard rail 20A Obstacle 34 Bracket 43 Projecting piece (protection member) 43a Guard rail facing surface of projecting piece h Projecting length of projecting piece H Guide Roller protrusion length

Claims (7)

[Claims] 1. A guide roller projecting laterally from a side surface of a vehicle body is provided at each of a front end and a rear end of the vehicle body, and when the vehicle body is moved on a path sandwiched by guard rails, In the lift truck in which each of the guide rollers is opposed to the guide rail, a protection member for protecting at least the guide rollers at both front ends of the respective guide rollers is projected from the vehicle body, and a passage is formed from the guard rail. A lift truck wherein the guide member does not collide with the obstacle protruding into the obstacle by the protection member. 2. The lift truck according to claim 1, wherein the protection member is provided so as to approach the guide roller and protrude toward the center of the vehicle body from the guide roller. 3. The lift truck according to claim 2, wherein a protruding length of the protection member is set slightly shorter than a protruding length of the guide roller. 4. The lift truck according to claim 3, wherein a guard rail facing surface of the protection member is inclined outwardly toward the guide roller. 5. The lift truck according to claim 1, wherein the protection member comprises a steel projecting piece having a substantially triangular shape in a plan view. 6. A front end of a pair of straddle legs extending forward from both sides of a lower portion of the vehicle body via brackets, and guide rollers at both ends of the front portion are rotatably provided via a bracket. The steel projecting piece protrudes from a side surface of the straddle leg.
The lift truck described. 7. The lift truck according to claim 6, wherein the steel projecting piece is formed integrally with the bracket.