JPH09132398A - Reach forklift truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely grasp the position of a mast as viewed from a driver's seat without using an electric means. SOLUTION: A pair of left and right masts 3, 3 which elevatably hold a fork 5, are provided so as to be longitudinally movable along legs 2. A beam 4 coupling between the masts 3, 3 is connected thereto with one end of a wire 6 which is adapted to be drawn up by a turning roller 7 and into a mast position indicating meter 9 attached to a main instrument panel 8 of a vehicle body 1 in a tensed condition. The mast position indicating meter 9 indicates a position of the masts 3 by means of an indicator needle which is rotated by the wire 6 in response to the movement of the masts 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of adjusting the amount of insertion of a fork mounted on the mast or the position of an attachment other than the fork mounted on the mast by moving the mast in the front-rear direction. And the reach type forklift truck.

[0002]

2. Description of the Related Art A mast is moved forward and backward by operating a reach lever projecting from an instrument panel. The amount of movement of the mast is determined by lever operation based on a long-standing intuition known to the operator himself. I made decisions by controlling the time and by looking directly at the mast or forks and attachments.

[0003]

In a reach type forklift equipped with a fork, the mast is basically pushed to the leading end when the fork is inserted, and retracted to the last when the lift is transferred. . However, as illustrated in FIG. 6A, when the pallets 35, 35 'on which the loads are loaded are arranged close to each other in the front-rear direction, when the mast 3 is pushed to the frontmost end, it is inserted into the pallet 35 in front. The tip of the fork 5 may protrude from the pallet 35 and reach the pallet 35 'hidden behind it. When the fork 5 is raised in this state, the front part of the rear pallet 35' is also taken together. Will be raised to. Therefore, in that case, it is necessary to adjust the protruding amount of the fork. In addition, for beginners who are poor in the ability to determine the stop timing and position of the mast, it is not possible to adjust the amount of protrusion of the fork, whether the mast has been moved to the leading edge, or vice versa. It is difficult to understand even the situation of
As illustrated in FIG. 6B, the pushing amount of the fork 5 is likely to be inadequate, and if the fork 5 is lifted in that state, the fork 5 is not deeply inserted into the pallet 35, resulting in poor stability. However, if the pallet 35 collides with the leg 2 when the fork 5 is retracted and descended as it is, the load placed on the pallet may be displaced due to a shock. Although it is easy to detect the position of the mast with an electric means such as a potentiometer and display the meter, it is necessary to use an electric means for the battery-type reach type forklift, which requires the minimum use of electric power. Is not preferable. It is an object of the present invention to provide a reach type forklift having a mast position indicating mechanism that does not use electrical means.

[0004]

SUMMARY OF THE INVENTION The present invention is a reach type forklift for the purpose of accurately grasping the position of the mast from the driver's seat with a simple and rational structure. In a reach type forklift that moves in the front-rear direction, a mast position display means is provided at a site visible from the driver's seat, and the front-rear movement amount of the mast is transmitted to the mast position display means through a mechanical transmission means, and the mast position is determined. The mast position display mechanism for operating the display function of the display means is provided. The mechanical transmission means has one end fixed to the mast, and the other end side being a wire wound on a winding reel attached to the vehicle body and given a rotational force in the winding direction, and The mast position display means may be a pointer rotation type display means, and the rotation of the winding reel may be decelerated to rotate the pointer axis in the pointer rotation type display means. Further, the mechanical transmission means is composed of a pinion gear that is provided on the mast and meshes with a rack fixed to the leg, and an endless wire that is also provided on the mast and moves in an endless track in conjunction with the pinion gear. It is possible to configure the mast position display means to be a linear movement type display means in which a pointer is attached to the endless wire and the pointer is reciprocally moved by an endless orbital motion of the endless wire. Further, the mechanical transmission means is a wire having one end fixed to the leg and the other end urged so as to always pull in the mast, and the mast position display means is attached with a pointer on the wire to move the wire. Thus, it is possible to provide linear movement type display means for reciprocating the pointer along the mast surface. The reach-type forklift includes a fork or an attachment other than the fork mounted in place of the fork.

[0005]

With the mast position display mechanism, the amount of forward and backward movement of the mast is transmitted via the mechanical transmission means to the mast position display means provided at a location visible from the driver's seat, and the display function of the mast position display means is changed. Since it is operated, the driver can accurately grasp the position of the mast by looking at the display of the mast position display means. Further, since the amount of forward and backward movement of the mast is transmitted to the mast position display means by various mechanical transmission means, there is no power consumption. And the above-mentioned effect is not only effective for adjusting the fork insertion amount,
Even for reach type forklifts with attachments other than forks, it is used to position the attachments.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A reach type forklift according to the present invention will be described with reference to the drawings. FIG. 1 shows the entire reach-type forklift truck. A pair of left and right legs 2 and 2 are horizontally projecting forward on the lower front surface of the vehicle body 1, and between the legs 2 and 2. Each leg 2, 2
A pair of left and right masts 3 and 3 are provided through a carriage that is attached so as to be able to move back and forth along the masts. These masts 3 and 3 are connected by a plurality of beams 4, 4, ... It is designed to be operated in the front-back direction. Further, the masts 3, 3 are equipped with forks 5 that move up and down along the masts 3, 3.

In the mast position display mechanism of the first embodiment, one end of a wire 6 is tied to one beam 4 of the beams connecting the masts 3 and 3 and the wire 6
Was pulled up by a turning pulley 7 attached to the front surface of the vehicle body 1 and pulled into a mast position display meter 9 as a pointer rotating type display means attached to an instrument panel 8 of the vehicle body 1. It is installed in the state.

In the mast position display meter 9, as shown in FIG. 2, reduction gears 11 and 12 composed of a set of large and small are mounted on a back surface of a substrate 10 so as to be rotatable by rotating shafts 13 and 14, respectively. The pointer 15 of the pointer rotating type display means is provided at the tip of the rotating shaft 13 protruding to the front surface of the substrate 10.
Is attached. On the other hand, a winding reel 17 to which a rotating force is applied in one direction by a mainspring 16 is attached to the rotating shaft 14 so as to rotate integrally with the reduction gear 12 having the small diameter. The other end side of the wire 6 pulled up by the turning pulley 7 by the spring force of the mainspring spring 16 is connected to the coil 17 so as to be wound in a tensioned state.
A transparent cover 18 is attached to the front surface of the substrate 10, and the rear surface of the substrate 10 is covered with a protective cover 19 to cover the rear surface thereof. As shown in FIG. If the display surface provided with the scale is directed to the driver's seat side, the operator can easily confirm the display of the mast position display meter 9, and the appearance is in harmony with the instrument panel 8.

In the reach type forklift thus constructed, when the wire 6 is pulled by the forward movement of the mast 3, the other end of the wire 6 is taken up by the take-up reel 1.
When it is unwound from 7 and the mast 3 retracts, the wire 6
Since the spring is wound by the spring force of the mainspring 16, the take-up reel 17 is rotated by the forward / backward movement of the mast 3,
The large-diameter reduction gear 11 meshing with the small-diameter reduction gear 12 that rotates integrally with the take-up reel 17 is also rotated.
By rotating the large-diameter reduction gear 11, the tip of the pointer 15 moves in an arc, and the position (movement amount) of the mast 3 can be known from the angle of the pointer 15 (graduation supported by the pointer). .

In the first embodiment, the wire is automatically wound by the winding reel by the mainspring, and the rotation of the winding reel is transmitted to the pointer to display the position of the mast. It can be used for position display, or mast position display means can be provided on the mast side. That is, as in the second embodiment illustrated in FIG. 4A, the guide pulleys 20 and 21 are provided at the upper and lower ends of the mast 3, and the wire 6 having one end tied to the tip of the leg 2 is connected to the mast. 3 is wound around a guide pulley 21 provided at the lower end portion of the mast 3 and pulled up just above, and then wound around a guide pulley 20 provided at the upper end portion of the mast 3 and pulled down just below, and the other end of the pulled down wire 6 Attach the weight 22 to the wire 6
Is always pulled by the weight 22, and a portion of the wire 6 hung between the upper and lower guide pulleys 20 and 21 is
If the pointer 23 of the linear moving type display means is attached, the pointer 23 moves up and down by the movement of the mast 3, so that the position of the mast 3 can be grasped from the position indicated by the pointer 23.

Further, as in the third embodiment illustrated in FIG. 4B, a rack 24 is fixed along the longitudinal direction of the leg 2, and a pinion gear 25 meshing with the rack 24 is attached to the lower end of the mast 3. And a drive pulley 26 that rotates integrally with the pinion gear 25, and a driven pulley 27 provided at the upper end of the mast 3, both pulleys 26, 27 are connected by an endless wire 28, and the endless wire 28 has a pointer. Even with the structure in which the mast 3 is attached, the position of the mast 3 can be grasped by moving the pointer 23 up and down by the movement of the mast 3 similarly to the above. With this configuration,
Since the mechanical transmission means and the mast position display means are assembled on the mast side, there is no obstructive wire between the mast and the vehicle body, and troubles such as hooking an object on the wire are eliminated.

Since the above two embodiments have a structure in which the pointer is moved vertically along the mast, when the pointer is located below the pointer, the pointer becomes difficult to see from the driver's seat and the horizontal movement amount is moved vertically. Although it may be uncomfortable to be displayed, the rack 24 is fixed along the longitudinal direction of the leg 2 as in the fourth embodiment illustrated in FIG. The transmission pulley 29 and the driven pulley 30 are provided at both ends of the beam 4, and the pinion gear 2 that meshes with the rack 24 is provided at the lower end of the mast 3.
5 is provided with a drive box 32 that rotates in synchronization with the pinion gear 25 about a rotation axis that is orthogonal to the rotation axis of the pinion gear 25. , Its drive pulley 32 and said transmission pulley 29, and its transmission pulley 29 and driven pulley 30.
And the driven pulley 30 are connected to each other by endless wires 33 and 34, respectively.
If the pointer 23 is attached to, the pointer 23 horizontally moves along the beam 4 by the movement of the mast 3 and functions as a linear movement type display means for displaying the position of the mast 3.
The visibility from the driver's seat is excellent and the position of the mast 3 can be grasped accurately.

Further, the linear movement type display means for displaying the position of the mast by horizontally moving the pointer is provided on the rotary shaft to which the winding reel is attached in the pointer rotary type display means of the first embodiment. By providing a drive pulley (driven pulley) corresponding to the transmission pulley of the linear movement type display means for horizontally moving the pointer to display the position of the mast, it can be realized on the driver's side as well. If the mast is moved in the same front-back direction as the moving direction of the mast, the amount of movement of the mast can be grasped more easily.

In any of these configurations, a belt or a chain may be used as a substitute for the wire. Further, as the mechanical transmission means, not only the wire and the take-up reel, the wire and the weight, the rack and the pinion gear are used, but also a coil spring is used as a substitute for the weight, and a rotary shaft and various link mechanisms are combined. Not only are they provided between the mast and the vehicle body, or between the mast and the leg, but also between the member on the mast side and the member on the vehicle body side that relatively move in the reach type forklift. It is also possible to select, for example, a rod of a reach cylinder as an attachment target as long as it is between them. Further, the mast position display means is not limited to the embodiment as long as it can display by rotating or moving the pointer, and the weight can be used as a substitute for the pointer. The reach type forklift is
The fork does not necessarily have to be attached, and various attachments may be attached instead of the fork. As an attachment mounted in place of the fork, for example, a roll clamp or the like can be cited. That is, the reach type forklift to which the present invention is applied includes a type in which an attachment other than the fork is mounted.

[0015]

According to the present invention, the position of the mast can be grasped from the driver's seat by a simple mechanical means without using any electric means. But the fork can be positioned accurately. In addition, a wire whose one end is fixed to the mast side is wound so as to be constantly pulled by a take-up reel provided on the vehicle body side, and the rotation of the take-up reel is decelerated and transmitted to a pointer. By doing so, the meter functions as a pointer-rotating type meter that has a good appearance and the display portion is easy to see, and can be supplied at a low cost. Further, if the linear moving display means is provided on the mast side, the visibility from the driver's seat is excellent and the position of the mast can be easily grasped. Even in the type in which the attachment is attached instead of the fork, the attachment can be easily positioned by accurately grasping the position of the mast.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an entire reach type forklift according to the present invention.

FIG. 2 is an explanatory diagram showing a structure of a mast position display meter.

FIG. 3 is an explanatory diagram showing a mounting example of a mast position display meter.

FIG. 4 is an explanatory diagram of a modified example.

FIG. 5 is an explanatory diagram showing another modification example.

FIG. 6 is an explanatory diagram showing a problem in a conventional reach type forklift.

[Explanation of symbols]

1 ... Vehicle body, 2 ... leg, 3 ... mast, 4 ...
Beam, 5 ・ ・ Fork, 6 ・ ・ Wire, 7 ・ ・ Turning pulley, 8 ・ ・ Instrument panel, 9 ・ ・ Mast position display meter, 10 ・ ・ Substrate, 11,12 ・ ・ Reduction gear, 13,14 ・・ Rotating shafts, 15 ・ ・ Hands, 16 ・ ・ Spring springs, 17 ・ ・ Winding reels, 18 ・ ・ Covers, 19 ・ ・ Protective covers, 20, 21 ・ ・ Guide pulleys,
22 ... weight, 23 ... pointer, 24 ... rack, 25 ...
Pinion gear, 26 ··· Drive pulley, 27 · · Driven pulley, 18 · · Endless wire, 29 · · Transmission pulley, 30 ·
・ Driven pulley, 31 ・ ・ Gearbox, 32 ・ ・ Drive pulley, 33,34 ・ ・ Endless wire, 35,35 '・ ・ Pallet.

Claims (5)

[Claims] 1. A reach type forklift for moving a mast in the front-rear direction, wherein a mast position display means is provided at a portion visible from a driver's seat, and the front-rear movement amount of the mast is transmitted through a mechanical transmission means. Communicate to
A reach type forklift equipped with a mast position display mechanism for operating the display function of the mast position display means. 2. The wire, wherein one end of the mechanical transmission means is fixed to the mast, and the other end of the mechanical transmission means is wound around a winding reel attached to the vehicle body and given a rotational force in the winding direction. The mast position display means is a pointer rotation type display means, and the rotation of the take-up reel is decelerated to rotate the pointer shaft in the pointer rotation type display means. Reach type forklift. 3. The pinion gear, wherein the mechanical transmission means is provided on the mast and meshes with a rack fixed to the leg, and the endless endless track motion, which is also provided on the mast and interlocks with the pinion gear. The mast position display means according to claim 1 is a reach type forklift truck which is a linear movement type display means in which a pointer is attached to the endless wire and the pointer is reciprocally moved by an endless orbital motion of the endless wire. . 4. The mast position indicating means according to claim 1, wherein the mechanical transmission means is a wire having one end fixed to the leg and the other end being constantly urged in the mast. A reach type forklift truck which is a linear movement type display means in which a pointer is attached to the wire and the wire is moved to reciprocate along the mast surface. 5. The reach type forklift according to any one of claims 1 to 4, wherein the reach type forklift is equipped with a fork or an attachment other than the fork in place of the fork.