JP5641919B2 - Reach forklift - Google Patents

Description

  The present invention relates to a reach-type forklift, and more particularly to a reach-type forklift suitable for preventing contact of a reach-type forklift during turning.

  In general, a reach forklift (hereinafter referred to as “forklift”) is known as a vehicle used for carrying goods. The forklift is provided with a fork (claw) for handling a load in front of the vehicle, a mast (support) for supporting the fork so as to be movable in the vertical direction, and the like. The rear wheels of the forklift are steered wheels that are steered, and the front wheels are idle wheels that are not steered.

  A forklift is used for loading cargo stored in a warehouse and loading a warehouse to store the cargo. At this time, after the forklift travels in the warehouse passage, it turns to the right or left, loads the luggage from the shelf provided on the side of the passage, and loads the luggage onto the shelf. Turn in the direction or to the right and drive towards the destination that carries the load. Hereinafter, the forklift turns and loads and loads are loaded as “right-angle loading”.

  As described above, the passage width necessary for the forklift to stack rightward or leftward in the right direction is called a right-angled passage width. By setting the width of the passage of the warehouse to be equal to or greater than the width of the right-angle loading passage, the forklift can load right-angle without contact with the side wall of the passage, the shelf, or the luggage stored in the warehouse.

  Here, the right-angle product passage width will be described with reference to FIG. FIG. 6 illustrates a right-angle product passage width in a forklift (for example, see Patent Documents 1 and 2) including two front wheels and one steering rear wheel on the left rear.

  FIG. 6A illustrates the right-angle product passage width when the forklift turns right. In this case, the right-angle product passage width is defined as a distance BR from the left rear end of the forklift body to the right turning center PR and a distance AR from the right front end of the load loaded on the forklift to the right turning center PR. Sum (AR + BR).

  FIG. 6B illustrates the right-angle product passage width when the forklift turns left. The width of the right-angle product passage when turning left is the distance BL from the right rear end of the forklift body to the left turning center PL and the distance AL from the left front end of the load loaded on the forklift to the left turning center PL. Sum (AL + BL).

  The right turning center PR when the forklift turns right is a straight line connecting the centers of the two front wheels 11 and a straight line connecting the left rear end of the body of the forklift and the right front end of the load PT loaded on the forklift. It is an intersection. Similarly, the left turning center PL when the forklift turns left is a straight line connecting the centers of the two front wheels 11, a straight line connecting the right rear end of the body of the forklift and the left front end of the load PT loaded on the forklift, Is the intersection of

JP-A-11-301233 JP 2000-062428 A

  As shown in FIG. 6, when the forklift is stacked at a right angle (turns when loading and unloading, or turning when loading), the forklift turning trajectory TO is drawn by the left and right rear ends of the forklift body. It is. Therefore, if the left and right rear ends of the vehicle body can be brought closer to the turning center, the radius of the turning trajectory TO can be reduced. As a result, when the forklift performs right-angle loading, the left and right rear ends of the vehicle body are less likely to contact the side walls and shelves of the passage.

  However, as described in Patent Documents 1 and 2, a steering rear wheel and a driving rear wheel are disposed at the left rear end of the body of the forklift. In other words, the left rear end of the vehicle body needs to secure a space for storing a rear wheel, a drive source for driving the rear wheel, a mechanism for changing the direction of the rear wheel, etc., and the left rear end is easily brought close to the turning center. I can't. As a result, there is a problem that the turning radius when the forklift performs right-angle loading cannot be reduced, and it is difficult to prevent contact between the vehicle body and the passage side wall or the like.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a forklift that can suppress the vehicle body of the forklift from coming into contact with the periphery during right-angle loading.

In order to achieve the above object, the present invention provides the following means.
In the forklift according to the present invention, a pair of wheels are disposed in front of a vehicle body provided with a cargo handling portion, and rear wheels used for steering are accommodated in at least one of a right end and a left end at the rear of the vehicle body. Further, the portion of the vehicle body that faces the rear wheel is notched by the notch, and a part of the passing region that passes when the rear wheel is steered protrudes from the notch to the outside of the vehicle body. It is configured. In other words, when the rear wheel is steered when the vehicle body is viewed from above or below, a part of the rear wheel overlaps with a notched region of the vehicle body.

  By doing in this way, the turning radius at the time of right-angle loading can be made small, without shortening the wheel base which is the distance between a pair of front wheels and a rear wheel. Specifically, the turning center at the time of right-angle loading (a point on a straight line connecting a pair of front wheels) and the rear wheel of at least the right rear end and the left rear end in the vehicle body are arranged. Since the distance to the side can be shortened, the turning radius during right-angle loading is reduced.

  It is desirable that the upper side of the notch is disposed above the rotation axis when the rear wheel rolls. By doing in this way, it can arrange so that a part of rear wheel may overlap a notched field in a vehicle body, without making a vehicle body and a rear wheel interfere.

  The rear wheel is formed in a columnar shape or a cylindrical shape centering on the rotation axis described above, and the rotation axis described above is arranged in parallel with, for example, horizontally, a traveling surface on which the forklift travels. The ground contact surface that contacts the running surface of the rear wheel is farthest from the rotation axis at the same height as the rotation axis. That is, at the same height as the rotation axis, the distance between the vehicle main body and the rear wheel approaches and there is a high possibility of interference. Therefore, by arranging the upper side of the notch portion above the above-described rotation axis, it is possible to easily avoid the interference between the vehicle main body and the rear wheel.

  When the forklift is mounted at right angles, that is, when turning around a point on the line connecting the pair of front wheels, the entire rear wheel must be housed inside the vehicle body and not protrude outside the vehicle body Is desirable. For example, since the rear wheels do not protrude outward from the vehicle body during right-angle loading in a forklift, it is possible to prevent the right-angle loading width from being widened by the rear wheels, in other words, from increasing the radius of the turning track. Further, at the time of right-angle loading, it is possible to prevent the rear wheels from coming into contact with the side walls or shelves of the passage and to prevent the subsequent running of the forklift.

  When the forklift travels straight, it is desirable that a part of the rear wheel is disposed at least in a notched region of the vehicle body. When going straight, even if a part of the rear wheel, for example, the rearmost protruding part is arranged in a notched region of the vehicle main body, more specifically, it protrudes outside the vehicle main body, It does not affect the loading width, in other words, the turning trajectory during right-angle loading. Therefore, when traveling straight, when the forklift is viewed from above or below, the rearmost portion of the rear wheel can be overlapped or protruded outward in the notched region of the vehicle body. And the part which accommodates the rear-wheel in a vehicle main body can be brought close to a turning center so that the right-angle loading width | variety in a forklift, in other words, the turning radius at the time of right-angle loading may become small.

  It is desirable that the rear end of the rear wheel is disposed in front of the rear end, which is the rearmost protruding portion of the vehicle body. In this way, for example, when the forklift is moving backward straight, when the vehicle comes into contact with a rear wall or an obstacle, the vehicle body comes into contact with the wall or the obstacle before the rear wheel. In other words, the rear wheel is protected by the vehicle body, and the rear wheel is prevented from being damaged, and thus it is possible to prevent the forklift from traveling.

According to the forklift of the present invention, a portion of the vehicle body that faces the rear wheel is cut out by the cutout portion, and a part of the passing region that passes when the rear wheel is steered from the cutout portion to the outside of the vehicle main body. It is possible to reduce the turning radius during right-angle loading without shortening the wheel base, which is the distance between the pair of front and rear wheels, and forklift vehicle body during right-angle loading. There is an effect that it is possible to suppress contact with the periphery.

It is a mimetic diagram explaining the whole forklift concerning the embodiment of the present invention. It is the figure which looked at the vehicle main body explaining the structure of the left rear end in the vehicle main body of FIG. 1 from diagonally backward upper direction. It is the figure which looked at the vehicle main body explaining the structure of the left rear end in the vehicle main body of FIG. 1 from diagonally backward lower direction. It is the figure which looked at the vehicle main body explaining the structure of the notch part of FIG. 2 from back. It is a ZZ 'line arrow directional cross-sectional view explaining the positional relationship of a vehicle main body and a rear wheel. It is a schematic diagram explaining the right-angle product passage width when a forklift turns right and turns left.

  A forklift according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram illustrating the overall configuration of a forklift 1 according to this embodiment, FIG. 1 (a) is a plan view, and FIG. 1 (b) is a side view.

  The forklift 1 according to this embodiment is used for transporting luggage, and is particularly used for cargo handling work in a factory, a warehouse, a freight station, a port, or the like. As shown in FIG. 1, the forklift 1 is mainly provided with a vehicle main body 10 on which a driver enters and a cargo handling unit 20 that handles luggage.

  The vehicle main body 10 is mainly provided with front wheels 11 and rear wheels 12 used for traveling of the forklift 1, an outrigger 13 on which the front wheels 11 are arranged, and a driver seat 14 on which a driver gets.

  The front wheels 11 are a pair of wheels respectively disposed at the front end of the outrigger 13 as shown in FIGS. 1 (a) and 1 (b). In the present embodiment, description will be made by applying to an example in which the front wheel 11 is an idle wheel in which the direction of the rotation shaft is fixed with respect to the vehicle body 10. The rear wheel 12 is a single wheel disposed at the left rear end of the vehicle body 10. The rear wheel 12 is a driving wheel to which a rotational driving force is transmitted from a driving unit (not shown) such as a motor, and the traveling direction of the forklift 1 in which the direction of the rotating shaft with respect to the vehicle body 10 can be changed. It is also a steering wheel to be determined. In the present embodiment, description will be made by applying to an example in which auxiliary wheels (not shown) are provided below the driver's seat 14.

  The outriggers 13 are a pair of arm-like members provided on the lower front side of the vehicle main body 10, and are arranged so as to extend in parallel from the left and right ends of the front lower end of the vehicle main body 10 toward the front. . A cargo handling section 20 is disposed between the pair of outriggers 13 and 13, and the cargo handling section 20 is movable between the pair of outriggers 13 and 13 in the front-rear direction.

  The driver's seat 14 is a place where the driver gets into the forklift 1 and operates the forklift 1 in a standing posture. The driver's seat 14 is provided at the right rear end of the vehicle body 10, and a handle 15 for steering the rear wheel 12 is provided. In addition, an operation unit 16 such as a lever for operating the cargo handling unit 20 is provided in the driver's seat 14. The driver may drive the forklift 1 in a standing posture as described above, or may drive the forklift 1 in a sitting posture, and is not particularly limited.

  As shown in FIGS. 1 (a) and 1 (b), the cargo handling unit 20 includes a fork 21 used to load a load, a lifting body 22 to which the fork 21 is attached, a fork 21 and a lifting body 22. A mast 23 that moves in the vertical direction is mainly provided.

  The fork 21 is a pair of arm-like members provided on the front surface of the elevating body 22, and is arranged so as to extend in parallel from the left and right ends of the lower end of the front surface of the elevating body 22 toward the front. The fork 21 is inserted into an insertion hole of a pallet PT formed in a substantially rectangular parallelepiped shape on which a load is placed. The fork 21 lifts or lowers only the pallet PT or the pallet PT on which the load is placed. .

  The elevating body 22 supports the fork 21 and is movable up and down along the mast 23 by an elevating cylinder (not shown) arranged between the elevating body 22 and the mast 23. .

  The mast 23 is a pair of columnar members arranged in parallel and facing each other, and is arranged extending in the vertical direction. Further, the pair of masts 23 and 23 are supported by the fork 21 and the lifting body 22 disposed between them so as to be vertically movable.

  Here, the notch 31 provided in the vehicle main body 10 that is a feature of the present embodiment will be described with reference to FIGS. 2 to 5. FIG. 2 is a view of the vehicle main body 10 illustrating the configuration of the left rear end of the vehicle main body 10 as viewed from obliquely upward and rearward, and FIG. 3 is a view of the vehicle main body 10 as viewed from obliquely rearward and downward. 4 is a view of the vehicle body 10 illustrating the configuration of the notch 31 in FIG. 2 as viewed from the rear, and FIG. 5 is a Z- view illustrating the positional relationship between the vehicle body 10 and the rear wheel 12. FIG.

  As shown in FIGS. 2 to 4, the notch 31 is a portion facing the rear wheel 12 of the plate-like member constituting the rear surface of the vehicle body 10, in other words, a notch below the left rear end. . As shown in FIG. 4, the plate-like member constituting the rear surface of the vehicle main body 10 is arranged such that the lower end thereof extends below the rotational axis RC of rolling in the rear wheel 12. The notch 31 is formed so that the above-described plate-like member is notched in a concave shape from the lower end to the upper side, and the upper side 32 of the notch 31 is located above the rotation axis RC.

  As shown in FIG. 5, the rear wheel 12 is disposed so as to be rotatable around a steering shaft extending perpendicular to the paper surface. When the rear wheel 12 is steered, a part of the rear wheel 12 passes through a region cut out by the cutout portion 31 in the vehicle main body 10. In other words, most of the passing area SA that passes when the rear wheel 12 is steered is located inside the vehicle body 10, but a part of the passing area SA extends from the notch 31 to the outside of the vehicle body 10. It protrudes. In other words, when the vehicle body 10 is viewed from above or below, the plate-like member constituting the rear surface of the vehicle body 10 and a part of the rear wheel 12 overlap and overlap.

  In the present embodiment, when the forklift 1 moves straight (the rear wheel 12 is depicted by a solid line in FIG. 5), the rear end of the rear wheel 12 is located outside the vehicle body 10 via the notch 31. The description will be made by applying to an example protruding from the above. The rear wheel 12 and the vehicle main body 10 may be in a relative positional relationship that allows the rear end of the rear wheel 12 to protrude outside the vehicle main body 10, or at most, the rear end of the rear wheel 12, There may be a relative positional relationship in which the plate-like member constituting the rear surface of the vehicle main body 10 overlaps, and there is no particular limitation.

  Further, the passing area SA of the rear wheel 12 is disposed in front of the rear end RE in the vehicle main body 10 (upward in FIG. 5). In other words, in the state where the forklift 1 goes straight, the rearmost end of the rear wheel 12 is disposed in front of the rear end RE of the vehicle body 10.

  On the other hand, in a state in which the forklift 1 turns at a right angle load or the like (for example, the state in which the rear wheel 12 is drawn by a two-dot chain line in FIG. 5), the rear wheel 12 is completely inside the vehicle body 10. It is stored so that it does not protrude outside the vehicle body 10.

Next, the operation of the forklift 1 having the above-described configuration when carrying a load will be described with reference to FIG.
As shown in FIG. 1, the forklift 1 travels to the vicinity of the load with the cargo handling unit 20 being reached, and stops at a position where the fork 21 faces the insertion hole of the pallet PT. Thereafter, the cargo handling unit 20 is pushed out (reached out) to the front of the forklift 1, and the fork 21 is inserted into the insertion hole of the pallet PT.

  Thereafter, the pallet PT is lifted by the cargo handling unit 20, and the cargo handling unit 20 is attracted (reached in) to the vehicle body 10. The forklift 1 turns rightward or leftward, travels to a desired position, and then turns rightward or leftward again to place a load.

  According to the above configuration, without turning the wheel base, which is the distance between the pair of front wheels 11, 11 and the rear wheel 12, turning at the time of loading and loading of the load as described above (turning at right angle loading) ) Can be made smaller. For example, the distance BR between the turning center PR (a point on a straight line connecting the pair of front wheels 11 and 11) and the left rear end of the vehicle main body 10 (see FIG. 6A). ) Can be shortened, the turning radius during right-angle loading is reduced.

  Since the upper side 32 in the notch 31 is disposed above the rotation axis RC of the rear wheel 12, the upper side 32 does not interfere with the vehicle main body 10 and the rear wheel 12, and is in a notched region in the vehicle main body 10. It can arrange | position so that a part of rear-wheel 12 may overlap.

  The rear wheel 12 is closest to the vehicle body 10 at the same height as the rotation axis RC, and is likely to interfere with the vehicle body 10. Therefore, by arranging the upper side 32 in the notch 31 above the rotation axis RC, avoiding interference between the vehicle main body 10 and the rear wheel 12, and the turning center PR at the time of right-angle loading and the vehicle main body 10, the distance BR between the left rear end (see FIG. 6A) can be shortened.

  When the forklift 1 is mounted at right angles, that is, when turning about a point on a line connecting the pair of front wheels 11, 11, the entire rear wheel 12 is housed inside the vehicle body 10, and the vehicle body 10 For example, when the forklift 1 is loaded at a right angle, it is possible to prevent the width of the right-angled product from being widened by the rear wheels 12, in other words, from increasing the radius of the turning track. Further, it is possible to prevent the rear wheel 12 from coming into contact with a side wall or a shelf of the passage at the time of right-angle loading, and to prevent the subsequent forklift 1 from traveling.

  Further, when the forklift 1 goes straight, even if a part of the rear wheel 12, for example, the most rearwardly protruding part is arranged in a region cut out by the cutout portion 31 of the vehicle main body 10, further speaking. Even if it protrudes to the outside of the vehicle body 10, it does not affect the right-angle product width in the forklift 1, in other words, the turning track during right-angle product. For this reason, when the forklift 1 goes straight, the rearmost part of the rear wheel 12 protrudes from the cutout region of the vehicle body 10 when viewed from above or below, or protrudes outward. Can be made. And the part which accommodates the rear-wheel 12 in the vehicle main body 10 can be brought close to the turning center so that the right-angle product width in the forklift 1, in other words, the turning radius at the time of right-angle product can be reduced.

  By disposing the rear wheel 12 in front of the rear end, the rear end of which is the most rearwardly projecting portion of the vehicle body 10, for example, when the forklift 1 is moving straight backward, When the vehicle body 10 comes into contact with the vehicle, the vehicle body 10 comes into contact with a wall or an obstacle before the rear wheel 12. In other words, the rear wheel 12 is protected by the vehicle body 10, so that the rear wheel 12 is prevented from being damaged, and consequently, the travel of the forklift 1 can be prevented from occurring.

  DESCRIPTION OF SYMBOLS 1 ... Forklift, 10 ... Vehicle main body, 20 ... Cargo handling part, 11 ... Front wheel, 12 ... Rear wheel, 31 ... Notch part, 32 ... Upper side

Claims (5)

A vehicle body provided with a cargo handling part used for carrying luggage,
A pair of front wheels disposed on the cargo handling portion side of the vehicle body;
A rear wheel housed in at least one of a right end side and a left end side opposite to the cargo handling portion in the vehicle body, and used for steering;
Reach-type forklift provided with
A notch is provided to cut out a portion of the vehicle body that faces the rear wheel;
A reach type forklift characterized in that a part of a passing region through which the rear wheel passes is steered from the notch to the outside of the vehicle body .   The reach forklift according to claim 1, wherein an upper side of the notch is disposed above a rotation axis when the rear wheel rolls. When the vehicle body turns around a point on a line connecting the pair of front wheels,
The reach type forklift according to claim 1, wherein the rear wheel is entirely accommodated in the vehicle body. When the vehicle body goes straight,
The reach forklift according to any one of claims 1 to 3, wherein a part of the rear wheel is disposed at least in a notched region of the vehicle main body.   The reach type forklift according to claim 4, wherein a rear end of the rear wheel is disposed in front of a rear end of the vehicle body.

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