JPH09328027A - Tilt angle adjusting device for industrial vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tilt angle adjusting device which can change a tilt angle in accordance with a running mode and a cargo handling work mode. SOLUTION: A seat 1 is set up on a car body 21 through a base plate 5. A front end part of a seat cushion 2 of the seat 1 is turnably pivotally mounted in the base plate 5, on the other hand, a rod of a tilt angle adjusting cylinder 8 arranged in a vertical direction in a rear part of the base plate 5 is connected to a rear surface of a seat back 3, by extension/contraction operating this adjusting cylinder 8 in accordance with a running mode and a cargo handling work mode, a total unit tilt of the seat 1 can be adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat tilt angle adjusting device suitable for an industrial vehicle such as a forklift.

[0002]

2. Description of the Related Art FIG. 5 schematically shows a seat 31 used in a conventional forklift. A seat 31 for a forklift is generally one in which a seat back 33 is integrated with a seat cushion 32, and an occupant when loading and unloading cargo (hereinafter referred to as cargo handling work). In consideration of the work posture, the seat cushion 32 is set so that the seat surface is close to horizontal and the rear tilt angle of the seat back 33 is small (close to vertical).

[0003]

However, as described above, since the seat for a forklift is designed to give priority to the working posture during the cargo handling work, it is necessary to carry the luggage or to travel with an empty load. There is a problem that the ride is not comfortable. In order to improve the riding comfort during traveling, when the seat cushion 31 has its seat surface raised forward and the rear tilt angle of the seat back 32 is set to a large value as shown by the imaginary line in the figure, the work posture during cargo handling work Will be painful.

The present invention has been made in view of the above problems, and an object of the present invention is to adjust the tilt angle of the entire seat so that a sitting posture corresponding to the traveling mode and the cargo handling work mode can be obtained. Provided is an industrial vehicle seat tilt angle adjusting device.

[0005]

Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. That is, the invention of claim 1 is a tilt angle adjusting device for a seat for an industrial vehicle, comprising a seat tiltably attached to a vehicle body, and a seat angle adjusting means for adjusting the tilt angle of the entire seat. It is characterized by having.

According to the invention of claim 1 configured as described above, when the work mode is converted while the vehicle is driving, that is, when the traveling mode is changed to the cargo handling work mode or the cargo handling work mode is changed to the traveling mode. By operating the seat angle conversion means, it is possible to adjust the tilt angle of the entire seat and perform work in a comfortable posture.

According to a second aspect of the present invention, there is provided a seat which is tiltably attached to the vehicle body, and a seat angle adjusting means for adjusting the tilt angle of the entire seat to a tilt angle for traveling and a tilt angle for cargo handling work. It is characterized by further comprising: detection means for detecting a traveling work mode and a cargo handling work mode, and a control means for activating the seat angle adjusting means based on a signal from the detecting means. Therefore, according to the second aspect of the present invention, the seat angle adjusting means is operated based on the detection of the traveling form and the cargo handling work form to automatically adjust the entire seat to the tilt angle corresponding to the traveling form and the cargo handling work form. it can.

According to a third aspect of the present invention, in the tilt angle adjusting device for a forklift seat according to the first aspect, the seat angle adjusting means comprises a hydraulic cylinder. Therefore, according to the invention of claim 3, it is possible to provide a seat angle adjusting means having a simple structure.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a side view of the seat tilt angle adjusting device, FIG. 2 is an exploded perspective view of the seat tilt angle adjusting device, and FIGS. 3 and 4 are explanatory views of the seat angle adjusting function. FIG. FIG. 4 shows the cargo handling work. As shown in the figure, the seat 1 according to the present embodiment is a fixed seat back type in which a seat back 3 is fixed to a seat cushion 2, and is mounted on a vehicle body 21 of a forklift truck via a seat track 4 and a base plate 5. .

As shown in FIGS. 1 and 2, the seat track 4 as a front and rear position adjusting device for the seat 1 has a lower rail 4a fixed to the vehicle body side and the lower rail 4a.
And a movable upper rail 4b as a main constituent member, and a seat mounting hinge bracket 5a is provided on the front side of the upper rail 4b, and a cylinder mounting hinge bracket 5b is provided on the rear side. A base plate 5 formed in a slightly long rectangular frame shape is fixed with bolts or the like.

A cushion hinge bracket 6 is fixedly attached to the front lower surface of the seat cushion 2 of the seat 1, and the hinge bracket 6 is pivotally attached to the front hinge bracket 5a of the base plate 5 through a pin 7 so as to be vertically rotatable. Has been done. A hydraulic angle adjusting cylinder 8 as a seat angle adjusting means is vertically arranged behind the seat 1. The base end of the angle adjusting cylinder 8 is pivotally attached to a hinge bracket 5b at the rear of the base plate 5 by a pin 9 so that the rod end, which is the front end, is attached to the back hinge bracket 11 of the seat back 3 by a pin 12. Is rotatably pivoted by. The back hinge bracket 11 is fixed by welding to the seat back frame 10 forming the skeleton in the seat back 3, and the hinge portion thereof is exposed on the back side.

Thus, the seat 1 is supported by the base plate 5 so as to be vertically rotatable about the front end side as a fulcrum, and the rear end side is moved up and down by the angle adjusting cylinder 8 so that the seat surface of the seat cushion 2 is moved. The angle and the back angle of the seat back 3 are adjusted. Hydraulic hoses 13a and 13b are respectively connected to the bottom side oil chamber and the rod side oil chamber of the angle adjusting cylinder 8, and these two hydraulic hoses 13a and 13b are solenoids arranged in the engine room of the forklift. Valve 1
4 to the hydraulic pressure generation unit 15. The solenoid valve 14 is of the three-position type and is always held in the neutral position.

A sequencer 16 as a control means for controlling the switching operation is connected to the solenoid valve 14, and the sequencer 16 has a limit switch 17 for detecting the rearward inclination of the mast 22 which is inclined forward and backward by the tilt cylinder 24. A limit switch 18 (hereinafter, referred to as a fork switch) that detects a lower end of the fork 23 that is moved up and down along the mast 22 is connected (hereinafter, referred to as a mast switch). That is, both switches 1
7 and 18 constitute a detecting means for detecting the traveling mode and the cargo handling work mode. The fork 23 is moved up and down by a lift cylinder (not shown) via a lift chain.

In the case of a forklift, traveling is the fork 2
3 is lifted to a certain height and the mast 22 is tilted backward, and the cargo handling work is performed with the mast 22 tilted forward or upright. Based on the above, the sequencer 16 controls the operation of the solenoid valve 14. Then, in the present embodiment, the sequencer 1
6 is configured to control the solenoid valve 14 by determining whether it is a traveling mode or a working mode based on, for example, four patterns 1 to 4 shown below.

Pattern 1. When the fork switch 18 is off (the fork is raised) and the mast switch 17 is on (the mast is tilted backward), the traveling mode. Pattern 2. When the fork switch 18 is off (the fork is raised) and the mast switch 17 is off (the mast is leaning forward), the traveling mode. Pattern 3. When the fork switch 18 is on (fork lower end) and the mast switch 17 is off (mast forward tilt), the cargo handling work mode. Pattern 4. When the fork switch 18 is on (fork lower end) and the mast switch 17 is on (mast rearward tilt), the traveling mode.

Therefore, during the traveling work shown in FIG. 3, since the mast 22 is tilted backward and the fork 23 is lifted by a certain amount from the lower end, the mast switch 17 is moved to the mast 2.
3, the switch is turned on, and the fork switch 18 is separated from the fork 23 and turned off. In this state, it is determined that the vehicle is in the running mode, and the sequencer 16 operates to reduce the angle adjusting cylinder 8 (the rod side oil chamber is the pressure oil feeding side and the bottom side oil chamber is the pressure oil returning side). Switch 14

Therefore, the seat 1 is pulled down on the rear end side with the front end side of the seat cushion 2 being a pivot, and the entire seat 1 is tilted rearward. That is, the seat 1 is tilted backward to an angle suitable for the traveling posture of the occupant as shown in the figure. Further, when the mast 2 leans forward from the above state, the mast switch 17 is turned off, but at this time as well, it is determined that the vehicle is in the running form, and the backward leaning state of the seat 1 is maintained.

On the other hand, FIG. 4 shows a cargo handling operation. At this time, since the fork 23 is lowered to the vicinity of the lower end and the mast 22 is tilted forward, the mast switch 1
7 separates from the mast 22 and turns off, and the fork switch 18 contacts the fork 23 and turns on. This state is determined to be a cargo handling work mode (during ground loading or unloading), and the sequencer 16 extends the angle adjusting cylinder 8 (the rod-side oil chamber is on the pressure oil feeding side and the bottom-side oil chamber is on the bottom oil chamber). Solenoid valve 14 so that pressure oil returns)
Switch.

Therefore, the seat 1 is tilted forward by pushing up the rear end side with the front end side of the seat cushion 2 as a pivot. Therefore, the seat cushion 2 is in a substantially horizontal state, the seat back 3 is in a substantially vertical state, and the seat 1 is converted into a forward leaning state that is suitable for the cargo handling work posture of the occupant. Further, from this state, when the mast 22 tilts backward, the mast switch 17 is turned on, and at this time, it is determined that the mast switch 17 has changed to the traveling work state, and the sequencer 16 operates the angle adjusting cylinder 8 in the contracting direction. The solenoid valve 14 is switched. Therefore, the seat 1 is tilted backward to a posture suitable for the running posture.

As described above, according to the present embodiment, the inclination angle of the seat 1 is automatically adjusted according to the traveling and the cargo handling work, and the comfortable sitting posture of the occupant can be obtained according to the both modes. It becomes possible and the fatigue of the occupant can be reduced.

In the present embodiment, the running form and the cargo handling work form are judged depending on whether the mast 22 is tilted backward and whether the fork 23 is at the descending end. The present invention is not limited to this.For example, it is determined based on whether or not the forward / reverse switching lever is in the neutral position, determination based on the presence / absence of tire rotation, or a combination thereof. It is also possible to change the configuration.

Further, in the present embodiment, the inclination angle of the seat 1 is automatically adjusted. However, the occupant may manually operate the angle adjustment cylinder 8 to adjust the inclination of the seat 1. Good. Furthermore, the seat angle adjusting means is not limited to the angle adjusting cylinder 8, and a rack and pinion mechanism or a ball screw type feeding mechanism using a hydraulic motor or an electric motor as a drive source may be adopted. Furthermore, while the rear end of the seat cushion 2 is rotatably supported, the seat angle adjusting means may be arranged on the upper surface of the vehicle body 21 and the lower surface of the seat cushion 2 to move the front end of the seat cushion 2 up and down. .

[0023]

As described in detail above, according to the present invention,
Since the inclination angle of the entire seat can be adjusted in accordance with the traveling form and the cargo handling work form, the occupant can always work in a comfortable posture, which is effective in reducing the fatigue of the occupant.

[Brief description of drawings]

FIG. 1 is a side view showing an angle adjusting device for a seat for an industrial vehicle.

FIG. 2 is an exploded perspective view showing an angle adjusting device for a seat for an industrial vehicle.

FIG. 3 is an explanatory view of a seat angle adjusting operation, showing a traveling work.

FIG. 4 is an explanatory view of a seat angle adjusting operation, showing a traveling work.

FIG. 5 is a schematic explanatory view of a conventional forklift seat.

[Explanation of symbols]

 1 ... Seat 2 ... Seat cushion 3 ... Seat back 8 ... Angle adjustment cylinder 14 ... Solenoid valve 16 ... Sequencer 17 ... Limit switch for detecting mast rearward tilt 18 ... Limit switch for detecting fork lower end

Claims (3)

[Claims] 1. An industrial vehicle seat tilt angle adjusting device comprising a seat tiltably attached to a vehicle body and a seat angle adjusting means for adjusting a tilt angle of the entire seat. 2. A seat mounted tiltably on a vehicle body, and a seat angle adjusting means for adjusting the tilt angle of the entire seat to a tilt angle for traveling and a tilt angle for cargo handling work.
A tilt angle adjusting device for a seat for an industrial vehicle, comprising: a detecting means for detecting a traveling mode and a cargo handling work mode; and a control means for operating the seat angle adjusting means based on a signal from the detecting means. 3. The angle adjusting device for a forklift seat according to claim 1, wherein the seat angle adjusting means comprises a hydraulic cylinder.