JP2005239338A - Forklift - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forklift that has a constitution having an improved front visual field and has a lift interlocking means at a position where another matter hardly contacts with it and appearance is good. <P>SOLUTION: An inner frame lifting means 15 is located at the back of the rear surface of an inner frame 13 and disposed between an outer frame 9 and the inner frame, and the lift interlocking means 18 is disposed between a mast 6 and a lift bracket 17. The lift interlocking means comprises an idling wheel body 19 which is located above the outer frame and provided in the inner frame side and a cable-like body 20 wound on the idling wheel body. One end of the cable-like body is connected to the outer frame side, and the other end is connected to the lift bracket side. The part of the cable-like body between it and the outer frame is located at the back of the rear surface of the outer frame, and the part of the cable-like body between it and the lift bracket is located in front of the front surface of the outer frame and in the lateral width of the outer frame. Therefore, the cable-like body receives the coming another matter with the outer surface of the outer frame, allows another matter to hardly contact with it, and can be arranged at the position having good appearance. The inner frame lifting means can be arranged at the back of the rear surface of the inner frame and closely to the rear surface, and the front visual field can be further improved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a forklift in which a mast includes an outer frame and an inner frame guided to be movable up and down by the outer frame, and a lift bracket that is guided to be movable up and down by the inner frame is provided.

  In this type of forklift, a structure is provided in which a lift chain for raising and lowering the lift bracket is disposed outside the outer surface of the outer frame in order to improve the forward visual field. That is, conventionally, the upper tie beam of the inner mast (inner frame) is extended to the outer surface of the outer mast (outer frame), and a chain wheel is provided at the extended portion. And the structure by which the lift cylinder was standingly arranged by the rear surface rear surface of the outer mast is provided (for example, refer patent document 1).

As another conventional example, the left and right ends of the upper tie beam are projected further outward in the vehicle width direction from the outer surface in the vehicle width direction of the outer mast, and a sprocket plate is fixed to these both end portions to face the outer surface of the outer mast. A sprocket on which the lift chain is suspended is attached to the inner surface of the sprocket plate. And the structure by which the lift cylinder was standingly arranged by the rear surface rear surface of the outer mast is provided (for example, refer patent document 2).
Japanese Patent Laid-Open No. 3-232697 (first and third pages, FIG. 3) Japanese Patent Laid-Open No. 11-116192 (page 3, FIG. 4)

  However, according to the above-described two conventional configurations, the lift chain (lift chain) is located outside the outer surface of the outer mast so that other objects can easily come into contact with the lift chain (lift chain). And it looks even worse.

  Accordingly, the invention described in claim 1 of the present invention provides a forklift that can dispose the lift interlocking means at a position where it is difficult to make contact with other objects and has a good appearance, while being configured to improve the forward visual field. It is aimed at.

  In order to achieve the above-described object, a forklift according to claim 1 of the present invention includes a mast that includes an outer frame on the vehicle body side and an inner frame that is guided by the outer frame so as to be movable up and down. The forklift is provided with a lift bracket that is guided so as to be movable up and down, and is positioned behind the rear surface of the inner frame and provided with an inner frame lifting means between the outer frame and the inner frame, and between the mast and the lift bracket. A lift interlocking means is provided between the idler ring body positioned above the outer frame and provided on the inner frame side, and a cord-like body wound around the idler wheel body. The cable-shaped body has one end connected to the outer frame side and the other end connected to the lift bracket side.

  Therefore, according to the first aspect of the present invention, the forklift moves the inner frame up and down relative to the outer frame by the inner frame lifting means, and moves the lift bracket up and down relative to the inner frame via the lift interlocking means. Fork work can be done. And the lifting movement of the lift bracket via the lift interlocking means increases or decreases the length of the cord-like body with the outer frame by moving the idler wheel up and down integrally with the inner frame. Proportionally, the length of the cord-like body between the lift bracket and the lift bracket can be reduced.

  At that time, the portion between the cable body and the outer frame is located behind the rear surface of the outer frame, and the portion between the cable bracket and the lift bracket is located in front of the front surface of the outer frame. Since it is located inside, the approaching object is received by the outer surface of the outer frame. Furthermore, by arranging the idler wheel above the outer frame, the inner frame lifting means can be disposed behind the rear surface of the inner frame and close to the rear surface.

  According to the first aspect of the present invention described above, the forklift moves the inner frame up and down relative to the outer frame by the inner frame lifting and lowering means, and moves the lift bracket up and down relative to the inner frame via the lift interlocking means. , The expected fork work can be done. And the lifting movement of the lift bracket via the lift interlocking means increases or decreases the length of the cord-like body with the outer frame by moving the idler wheel up and down integrally with the inner frame. Proportionally, the length of the cord-like body between the lift bracket and the lift bracket can be reduced.

  At that time, the portion between the cable body and the outer frame is located behind the rear surface of the outer frame, and the portion between the cable bracket and the lift bracket is located in front of the front surface of the outer frame. Since it is located inside, the other object that has approached it can be received by the outer surface of the outer frame, it can be made difficult for the other object to come into contact with it, and the cord-like body can be arranged at a good-looking position. Furthermore, by disposing the idler wheel above the outer frame, the inner frame lifting / lowering means can be disposed behind the rear surface of the inner frame and close to the rear surface, thereby further improving the front field of view.

[Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The forklift 1 is provided with a pair of left and right front wheels (drive wheels) 3 at the front of the vehicle body 2 and a pair of left and right rear wheels (reversing wheels) 4 at the rear. A driving unit 5 is provided above. A mast 6 that can be expanded and contracted in the vertical direction is attached to a front end portion of the vehicle body 2 via a mast connecting shaft 7 in the vehicle width direction so as to be tiltable in the front-rear direction, and a tilt cylinder 8 that tilts in the front-rear direction is provided in the vehicle body 2. And the mast 6.

  The mast 6 is a pair of left and right outer frames 9 (a pair in the vehicle width direction) on the vehicle body 2 side, and left and right that can be raised and lowered by being guided by these outer frames 9 via an outer frame roller 11 and an inner frame roller 12. A lift cylinder (an example of an inner frame lifting / lowering means) 15 is provided between the outer frame 9 and the inner frame 13. On the inner frame 13 side, a lift bracket 17 that is guided through a bracket roller 16 and is movable up and down is provided, and a lift interlocking means 18 is provided between the mast 6 and the lift bracket 17. The lift bracket 17 is provided with a pair of left and right forks 25 with a holding frame 24 interposed therebetween.

  In the driving section 5, a seat 26, a handle 27 positioned in front of the seat 26, and the like are disposed, and a head guard 28 is disposed above. Further, a counterweight 29 is provided on the vehicle body 2 behind the seat 26.

  For the outer frame 9 and the inner frame 13 constituting the mast 6, a section steel whose cross section is uniform over the entire length is used. That is, the pair of left and right outer frames 9 are made of steel having a C-shaped cross section composed of a web portion 9A and a pair of flange portions 9B, and the roller guide surfaces 9b opposed to each other in the front and rear directions by both flange portions 9B. It is formed. The two outer frames 9 are integrated with each other via a plurality of connecting members 10 in a state where the open sides are arranged to face each other.

  The pair of left and right inner frames 13 are formed of a web portion 13A and a pair of flange portions 13B, and a cross section in which a section 13C is formed outwardly at the rear of the outer surface of the web portion 13A. The two flange portions 13B form a roller guide surface 13b opposed to each other in the front-rear direction, and the protrusion 13C forms a roller guide surface 13c facing forward. Both inner frames 13 are integrated via a plurality of connecting members 14 in a state where the open sides thereof are opposed to each other.

  Thus, the roller guide surface 13c is guided to the outer frame roller 11 and the inner frame roller 12 is guided between the front and rear roller guide surfaces 9b, so that the inner frame 13 can be raised and lowered with respect to the outer frame 9. Is done. The lift bracket 17 is configured to be movable up and down with respect to the inner frame 13 by guiding the bracket roller 16 to the roller guide surface 13b.

  The lift interlocking means 18 includes a pair of left and right idler wheels (sheves) 19 provided on the upper portion of the inner frame 13 and a chain (an example of a cord-like object) 20 wound around each of the idler wheels 19. The inner lower ends of these chains 20 are connected to the outer frame 9 side via a connecting body 21, and the outer lower ends of both chains 20 are connected to the lift bracket 17 side via a connecting body 22.

  At this time, the idler wheel body 19 is provided outside the outer surface of the bracket 23 continuously provided from the upper end of the inner frame 13 so as to be freely rotatable, and thus is positioned above the outer frame 9. And provided on the upper portion of the inner frame 13. As a result, the chain 20 is positioned and disposed within the lateral width of the outer frame 9. The lift cylinder 15 is located between the outer frame 9 and the inner frame 13, located behind the rear surface of the inner frame 13 and close to the rear surface.

The operation in the above embodiment will be described below.
The forklift 1 can travel by an operator sitting on the seat 26 of the driving unit 5 operating the handle 27. Then, the operator operates the lift lever by operating the lift lever 15 so that the inner frame roller 12 is guided by the roller guide surface 9b and the roller guide surface 13c is guided by the outer frame roller 11, while the outer frame roller 11 is guided. 9, the inner frame 13 can be moved up and down. The lift bracket 17 can be moved up and down while the bracket roller 16 is guided by the roller guide surface 13b via the lift interlocking means 18 by the up and down movement of the inner frame 13, and thus the fork 25 can be moved up and down.

  In addition, the operator can tilt (rotate) the mast 6 in the front-rear direction via the mast connecting shaft 7 by operating the tilt operating lever to expand and contract the tilt cylinder 8. Can also be tilted together. By these operations, the desired fork work can be performed.

  The lifting and lowering movement of the lift bracket 17 via the lift interlocking means 18 described above causes the idler wheel body 19 to move up and down integrally with the inner frame 13 via the bracket 23, so that the chain between the connection body 21 and the chain is connected. The length of the chain 20 is increased or decreased, and the length of the chain 20 with respect to the connecting body 22 is increased or decreased in proportion thereto. At this time, the portion between the chain 20 and the connecting body 21 is positioned behind the rear surface of the outer frame 9, and the portion between the chain 20 and the connecting body 22 is positioned in front of the front surface of the outer frame 9. Since it is located within the left and right widths of the frame 9, the approaching other object is received by the outer surface of the outer frame 9, making it difficult for the other object to come into contact with it, and the chain 20 in a good-looking position. It can be arranged.

  Furthermore, by disposing the idler wheel body 19 above the outer frame 9, the lift cylinder 15 can be arranged behind the rear surface of the inner frame 13 and close to the rear surface, thereby further improving the front field of view. It will be.

  In the above-described embodiment, there is shown a form in which the idler ring body 19 is provided on the bracket 23 connected upward from the upper end of the inner frame 13 so as to be freely rotatable. For example, the web 13A may be extended upward, and the idler wheel body 19 may be provided on the extended portion so as to be freely rotatable.

In the embodiment described above, the lift cylinder 15 is employed as the inner frame elevating means, but this may be a screw shaft type or a link type.
In the above-described embodiment, the form composed of the chain 20 is shown as the cord-like body of the lift interlocking means 18, but this may be a form composed of a wire rope.

  In the above embodiment, a form in which the fork 24 and the like are provided at the front part of the vehicle body 2 is shown. This is a forklift such as a side fork type in which a lateral fork is provided in the middle part of the vehicle body. There may be.

  In the above-described embodiment, the counter-type forklift 1 is shown, but this may be a forklift having a traversing system.

It is an exploded perspective view of the mast part in a forklift, showing an embodiment of the present invention. It is a side view of the forklift. It is a top view of the forklift. It is a partially notched top view of the mast upper end part in the forklift.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Forklift 2 Car body 5 Operation part 6 Mast 8 Tilt cylinder 9 Outer frame 9A Web part 9B Flange part 9b Roller guide surface 11 Outer frame roller 12 Inner frame roller 13 Inner frame 13A Web part 13B Flange part 13b Roller guide surface 13C Projection part 13c Roller guide surface 15 Lift cylinder (inner frame lifting means)
16 Bracket roller 17 Lift bracket 18 Lift interlocking means 19 Rotating wheel 20 Chain (cord)
23 Bracket 25 Fork

Claims (1)

  The mast is a forklift that includes an outer frame on the vehicle body side and an inner frame that is guided by the outer frame so as to be movable up and down. An inner frame raising / lowering means is provided between the outer frame and the inner frame, located behind the rear surface, and a lift interlocking means is provided between the mast and the lift bracket. The lift interlocking means is located above the outer frame. It is composed of an idler wheel that is positioned and provided on the inner frame side, and a cord-like body wound around the idler wheel, and one end of the cord-like body is connected to the outer frame side and the other end A forklift characterized in that is connected to the lift bracket side.

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