JPH07285792A - Cab support structure of high lift forklift truck - Google Patents

Abstract

PURPOSE:To provide the cab support structure of a high lift forklift truck wherein even when a container is lifted to a high position, a visual field is wide, an excellent visual view in the vicinity of the rear part of a car body is provided, further, a driver cab is properly tilted and the reasonable posture of a driver is produced. CONSTITUTION:The support structure of a forklift truck cab 29 is such that the floor surface of the cab 29 is pivotally mounted on a support structure 25 erected at the rear part of a car body. Further, a hydraulic cylinder 33 is suspended between the floor of the cab 29 and the support structure 25. An elevation stair 37 is caused to span from the central part of the front part of the car body toward the cab 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forklift truck, and more particularly to a cab support structure for a high lift forklift truck.

[0002]

2. Description of the Related Art Generally, forklift trucks are provided with a mast for raising and lowering a fork at a front portion of a vehicle body.
Often the view is blocked by this mast to some extent, but in high-lift forklift trucks (where cargo is lifted to a much higher position than normal ones), the mast itself is high, so the view is blocked. The tendency is remarkable. In addition, since luggage such as a container is lifted or lowered to a high position, the distance between the luggage and the driver's cab is increased, which may hinder accurate operation. In such a situation, conventionally, forklift trucks as shown in FIGS. 7 and 8, for example, have been conventionally used.

In FIGS. 7 and 8, a turret-shaped support column 3 is erected from the front of the machine base of the forklift truck or the vehicle body 1, and a driver's cab 5 is fixedly mounted thereon. The driver or operator enters the cab 5 and the mast 7
Container 11 by spreader 9 which is raised and lowered by
Hold and stack. In such a structure, since the mast hose guide 13 is provided on the side of the mast 7, when looking at both sides of the container 11,
It is difficult to obtain a sufficient field of view because it is blocked by the mast hose guide 13. Also, when moving backward,
Since the counterweight 1a at the rear of the machine base 1 blocks the view, sufficient visibility cannot be obtained. Containers are often stacked in a wide yard in tightly spaced, multi-tiered stages.Therefore, it is difficult to operate in a tight turn unless the visibility near both sides of the container and the rear of the vehicle body with steering wheels is insufficient. was there.

In order to increase the driver's field of vision, it has been proposed to dispose the driver's cab in the front-rear direction of the vehicle body (see Japanese Utility Model Laid-Open No. 64-45700).
When the cab is made higher than the upper surface of the vehicle body, the structure therefor becomes complicated, and it is often difficult to adopt it in an actual forklift.

Further, as shown in FIG. 7, when the operator's cab is installed at a high position via a column, a staircase is required to reach the operator's cab (not shown in FIG. 7). Since the entrance and exit doors of the room are generally on the side, the stairs are likely to be steep, and there is a high risk of going up and down. Further, the ascending / descending stairs are likely to protrude from the side of the vehicle body to the outside, and these points also tended to impair the characteristic of the small turn. There is also a type in which the stairs are temporarily turned to the counterweight direction and folded back toward the driver's seat in the middle, but there is a problem that the space in which the worker can move up and down is small and it is difficult to move up and down. It is left.

On the other hand, in order to improve the field of view by arranging the driver's cab at a high position, the driver's cab itself can be moved up and down in order to easily go up and down, that is, to enter and leave the operator's cab. Has been proposed to operate at a low position and to operate at a high position, but the operator's cab is moved up and down only by a vertical cylinder (Japanese Patent Laid-Open No. 62-41198, Sho 63).
However, since a large lift amount cannot be obtained depending on the length of the hydraulic cylinder, a link mechanism is often used (Japanese Patent Laid-Open No. 62-41199 and Japanese Utility Model Laid-Open No. 62-26393). See the bulletin).

Since the parallel link and the pantograph mechanism are used in the one using this link mechanism, the structure is complicated and the number of members used is large, so that maintenance and inspection are complicated and the driver always keeps horizontal. There is a problem when you go up and down in the state of and see the high position.

[0008]

As described above, in the conventional vehicle body in which the operator's cab is fixedly provided on the front portion of the vehicle body through the support columns, the visibility is narrow because the driver's cab is too close to the mast and the like. There is also a problem that the person looks up at a large angle of elevation and the driving posture becomes unreasonable, resulting in severe fatigue. In addition, since the field of view immediately after the rear end of the field of view is also blocked, there is a problem that it is difficult to steer in a small turn.

Further, in the conventional structure in which the ascending / descending stairs required when the driver's cab is fixed at a high position are provided on the side of the vehicle body,
The angle of inclination is tight, and the risk of going up and down is high,
There was a side which hindered the sharp driving.

Further, in the structure in which the operator's cab can be raised and lowered by using parallel links, the number of members is large and the structure is complicated, and a large installation space is required between the upper part of the vehicle body and the operator's cab. There was a problem that it was difficult to tilt the cab.

Therefore, the present invention has been made in order to solve the above-mentioned problems of the conventional device, and has a wide field of view even when a container or the like is lifted to a high position, and a good field of view near the rear part of the vehicle body can be obtained. It is another object of the present invention to provide a driver's cab support structure for a high-lift forklift truck in which the driver's cab is appropriately tilted and the posture of the driver is not overcompressed.

Another object of the present invention is to provide a high lift having a staircase that can be easily moved up and down to and from a driver's cab at a high position and that does not hinder the driving and turning performance of a forklift truck. It is to provide a cab support structure for a forklift truck.

Further, according to the present invention, not only the driver's cab itself can be lifted and lowered by a high lift, but also tiltable in the front-rear direction, a wide field of view can be obtained, and the driver's posture is not unreasonable during cargo handling work. An object of the present invention is to provide a cab support structure for a high-lift forklift truck.

[0014]

To achieve the above object, according to the present invention as set forth in claim 1, in a forklift truck having a high-lift mast, a support structure is provided upright at the rear portion of the vehicle body. The cab support structure is configured so that the floor surface of the cab is pivotally supported and supported, and further, the hydraulic cylinder is suspended between the floor surface of the cab and the support structure. According to the present invention as set forth in claim 2, an elevating staircase is installed from the center of the front part of the vehicle body toward the cab provided on the support structure at the rear part of the vehicle body. Furthermore, according to the present invention as set forth in claim 3, one end is pivotally attached to the rear part of the vehicle body, and the operator's cab is pivotally supported on the other end of the tiltable upright support column, and an elevating cylinder for tilting the upright support column. An attitude control cylinder for controlling the attitude of the driver's cab is arranged to form a driver's cab support structure of the high-lift forklift truck.

[0015]

According to the above construction, the driver's cab is separated from the mast, the angle formed by the driver's line of sight becomes small, and the blind spot becomes small. Further, since the driver's cab is located above the rear part of the vehicle body, the counterweight does not block the line of sight. In addition, the driver's cab is tilted by a hydraulic cylinder according to the driver's line of sight, and the front and face of the driver are containers to be loaded and
Facing the front of the car body in a natural posture. In addition, the ascending and descending stairs are separated from the side surface of the vehicle body to prevent collision with an adjacent object. Further, according to the present invention, the driver's cab itself can be raised and lowered, and the driver can enter and leave in the lowered position, and the driver's cab tilts so that the driver can sit in a natural posture in the driver's seat. Also, it is possible to face the object without difficulty, and it is possible to perform an appropriate operation.

[0016]

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding parts. 1 and 2, a high-lift mast 23 is provided at the front of the vehicle body or machine base 21.
Is provided. A support structure, that is, a pillar 25 is erected on the counterweight 21a at the rear of the machine base 21, and a driver's cab 29 is supported on the upper part of the support structure via a pivot support pin 27. The side surface and the ceiling of the cab 29 have a thin plate structure similar to a normal one, but the floor has a relatively high rigidity structure, and the pivot support pin 27 is inserted into the support bracket 31 on the bottom surface thereof. ing. Further, a hydraulic cylinder 33 is suspended between the front part of the bottom surface of the operator's cab 29 and the support column 25. This is a hydraulic pump (not shown) inside the machine base 21.
Is connected via a hydraulic hose or piping.

Around the cab 29, a handrail and a tread plate 35 are fixedly supported by the support column 25 via an appropriate support structure, and an elevating staircase 37 is installed toward this. The lower front end of the elevating stairs 37 approaches the mast 23 and is fixed above the center of the vehicle body 21. For this reason,
The slope is gentle and it is easy to move up and down.

The high-lift mast 23 is operated by moving an operation lever (not shown) in the operator's cab 29, while the container 39 is lifted by a spreader 41 and moved up and down. In such an arrangement, as shown by the line of sight V of the driver's viewpoint O, both sides of the container 39 and the spreader 41 are not hidden even if the mast hose guide 43 is present, and can be clearly seen. Furthermore, even if you look back and look down,
, The counterweight 21a does not obstruct the field of view, and the rear part of the vehicle body is clearly visible. When the hydraulic cylinder 33 is extended or shortened, the driver's cab 29 is tilted upwards (see FIG. 3) or downwards (see FIG. 4) so that the driver can take a natural posture. You will see the part. In the figure, symbols Vu, Vd, and Rd indicate the line of sight of the driver.

Next, another embodiment in which the operator's cab itself is vertically movable will be described with reference to FIGS. 5 and 6, a high-lift mast 123 is provided vertically in front of the machine base 121. A bracket 125 is protrudingly provided on the upper surface of the rear part of the machine base 121. A supine strut 127 is pivotally attached to the bracket 125.
Is pivotally attached to the bottom bracket 129a of the cab 129. Further, an elevating cylinder 131 for tilting the supine column 127 to elevate and lower the cab 129, and the cab 1
An attitude control cylinder 133 that tilts 29 from the horizontal state is provided.

FIG. 6 is a detailed exploded view showing how the lifting cylinder 131 and the attitude control cylinder 133 are attached. Both ends of the lifting cylinder 131 have pins 131.
It is rotatably attached to the supine column 127 and the frame of the machine base 121 via a, and its pin 131a is fixed by a bolt 131b. Similarly, the attitude control cylinder 13
Both ends of 3 are attached to the bottom bracket 129a of the operator's cab 129 and the supine strut 127 via the pin 133a and the bolt 133b.
It is rotatably attached to. Furthermore, the supine column 12
7 consists of two arms and one connecting rod,
Both ends thereof are rotatably attached by a pin 127a and a fixing bolt 127b.

With the above-described structure, when the lifting cylinder 131 is expanded and contracted by the hydraulic pump (not shown) provided inside the machine base 121, the upright support column 127 rotates about the lower end. Then, the cab 129 supported on the upper end is moved up and down. In addition, if the posture control cylinder 133 is expanded or contracted according to the inclination of the supine column 127, the operator's cab 129 can be maintained in a horizontal state, and the operator's cab can be directed upward to look upwards or to see the front of the machine base 121. It can be face down.

The above-mentioned operations of the cylinders 131 and 133 as well as the cargo handling operation of the mast 123 and the spreader 141 and the turning operation operation of the machine base 121 are performed by the levers and the handles in the operator cab 129. The position and posture of the cab 129 are optimized according to the work.

[0023]

As described above, according to the present invention,
The driver's cab was positioned at a high position above the counterweight at the rear of the vehicle body by a fixed or rotatable support structure and a supine strut. It is possible to prevent a contact collision with an object and perform appropriate driving and operation.

Further, according to the present invention, since the hydraulic cylinder and the attitude control cylinder for tilting the operator's cab are provided, the operator can tilt the operator's cab in a direction suitable for the work, and the driver takes an unreasonable attitude. I no longer need it. Therefore, drivability and maneuverability are improved, and fatigue of the driver is also reduced.

Furthermore, since the stairs for climbing up to the cab are gently installed from the front in the center of the vehicle body, it is easy to move up and down, and the side portions of the vehicle body are also neat, so that
In addition to the causes mentioned above, the drivability was improved.

[Brief description of drawings]

1 is a side view showing an embodiment of a cab support structure for a high-lift forklift truck according to the present invention.

2 is a plan view of the embodiment of FIG. 1. FIG.

FIG. 3 is a partial side view for explaining the operation of the embodiment of FIG.

FIG. 4 is a partial side view for explaining the operation of the embodiment of FIG.

FIG. 5 is a side view showing another embodiment of the present invention.

FIG. 6 is an exploded perspective view showing an exploded main part of the embodiment shown in FIG.

FIG. 7 is a side view showing an example of a conventional device.

FIG. 8 is a plan view of the device of FIG.

[Explanation of symbols]

21 ... Machine stand (vehicle body), 23 ... Mast, 25 ... Struts (support structure), 29 ... Operator's cab, 31 ... Support bracket, 33
… Hydraulic cylinder, 37… Elevating stairs (elevating ladder), 12
1 ... Machine stand, 123 ... Mast, 127 ... Supine stanchion, 129
... Operating room, 131 ... Elevating cylinder, 133 ... Attitude control cylinder.

Claims (3)

[Claims] 1. A driver's cab support structure for a forklift truck having a high-lift mast, the support structure being erected on a rear part of a vehicle body, and an upper end part of the support structure provided above the support structure. A high-lift forklift truck characterized in that it has an operator's cab having a floor surface pivotally attached to the operator and a hydraulic cylinder arranged to tilt the operator's cab and the supporting structure. Driver's cab support structure. 2. A driver's cab support for a high lift forklift truck according to claim 1, wherein a lifting ladder is temporarily installed between the upper surface of the front of the vehicle body and the front of the driver's cab. Construction. 3. A driver's cab support structure for a forklift truck having a high-lift mast, between an abdominal support column whose lower end is pivotally attached to the rear part of the vehicle body, and between the abdominal support column and the center part of the front vehicle body. And a driver's cab pivotally supported on the upper end of the front lie-up column, and between the cab and the front lie-up stanchion for adjusting the posture of the cab. Cab support structure for a high-lift forklift truck, characterized in that it has an improved attitude control cylinder.