JP2505808Y2 - Work vehicle seat system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a seat device for a work vehicle such as a forklift truck.

(Prior Art) In a forklift, a lift device is provided in front of the vehicle body, and an engine is arranged near the rear wheels between the front and rear wheels of the vehicle body to cover the upper part of the engine. A seat is provided on the hood to be covered.

By the way, when the forklift is run, the forklift vibrates up and down due to the unevenness of the road surface.

In this case, in the forklift, since the lift device is disposed in front of the vehicle body, the forklift vibrates up and down around the front wheel, unlike a seesaw, and the front wheel itself does not move up and down largely.

This becomes more remarkable as the weight of the load on the lift device increases.

(Problems to be solved by the invention) By the way, in the above-mentioned prior art, since the seat was provided on the engine cover located near the rear wheels, as described above, the forklift was centered around the front wheels and moved up and down like a seesaw. When the vehicle vibrates, there is a problem that the seat is greatly moved up and down due to the vertical movement of the rear part of the vehicle body, the riding comfort is poor, and the driver is easily tired.

An object of the present invention is to provide a seat device for a work vehicle that can solve the above problems.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the means adopted by the present invention is a work vehicle including a working device arranged in front of the vehicle body, in the front-back direction of the vehicle body. Regarding, with respect to the front wheel, a left and right pivot shaft is provided at a position substantially the same as the front wheel, and a support arm extending rearward is provided on the pivot shaft so as to be swingable in the vertical direction. A seat is provided at the rear part, and between the support arm and a portion of the vehicle body, which is located at substantially the same position as the front wheel in the front-rear direction, a. A holding spring for swingably holding the support arm and the seat, and b. The point is that a shock absorber is installed.

A seat is rotatably provided at the front end of the support arm at the rear end of the support arm by a mounting shaft in the left-right direction, and the seat is rotated substantially from the use posture and the use posture to the front. In some cases, the posture can be freely changed to an inverted posture.

In addition, an adjusting device for adjusting the force acting on the support arm of the holding spring may be provided.

(Operation) During traveling, the work vehicle vibrates up and down mainly like the seesaw around the front wheel due to the unevenness of the road surface.

As a result, the mounting portions of the support arm, the holding spring, and the shock absorber in the vehicle body also move up and down.

At this time, due to inertia, the support arm and the seat swing (vibrate) vertically relative to the vehicle body in a phase opposite to the vertical movement of the mounting portion while resisting the holding spring and the shock absorber. By absorbing the vertical movement of the mounting part,
Try to keep the seat at a constant height above the road.

In this case, if the mounting portion is the rear part of the vehicle body that largely moves up and down during traveling, even if the support arm swings, the vertical movement of the mounting portion cannot be sufficiently absorbed, and the seat is placed on the road surface. On the other hand, it moves up and down greatly.

On the other hand, according to the present invention, the above-mentioned mounting portion is a portion that is substantially at the same position as the front wheel in the front-rear direction, and does not move up and down significantly during traveling.

Therefore, the swing of the support arm sufficiently absorbs the vertical movement of the mounting portion, and the seat does not move largely up and down with respect to the road surface.

Further, when the vibration of the work vehicle becomes small or ends, the swing of the support arm is also quickly damped by the shock absorber.

(Embodiment) Hereinafter, an embodiment in which the present invention is applied to a forklift will be described with reference to the drawings. FIGS. 1 and 2 show a forklift, and the forklift is a vehicle body 1 and a lift device exemplified as a working device. 2 and.

The vehicle body 1 includes a vehicle body 4, a seat 5, and a safety frame 6
, Counterweight 7, front and rear wheels 8 for left and right pair,
It has 9 mag.

The vehicle body 4 includes a frame 11, an engine 12, and an engine 12.
Clutch 13 and transmission 14 in front of
And a front axle 15, a rear axle 16 and the like.

The frame 11 has a pair of left and right side members 18 whose rear portions project upward, and the side members 18 are connected by front and rear bottom portions and the like, so that the frame 11 is open vertically and vertically.

The engine 12, the transmission 14, the front axle 15, the rear axle 16 and the like are provided in the frame 11, and the engine 12 is arranged in the rear portion of the frame 11 and is located in the vicinity of the front of the rear wheel 9 in the front-rear direction. It projects above the frame 11.

The upper opening of the frame 11 is closed by a cabinet 20, a front floor cover 21, a bonnet 22 and a rear floor cover 23 that are arranged in series at the rear, and the cabinet 20 and the front floor cover 21 are provided at the front of the frame 11 and at the rear. Floor cover
23 is fixed to the rear end of the frame 11.

The cabinet 20 is erected from the frame 11, and the cabinet 20 is provided with an instrument panel 26 and a handle device 28 having a handle wheel 27 at the upper end.

The upper end of the rear end of the bonnet 22 is
Is attached to the engine 12 by a hinge 29, and the bonnet 22 covers the engine 12 so as to be openable and closable.

The seat 5 is located above the hood 22, and is provided in the cabinet 20 via a pair of left and right support arms 30 so as to be vertically swingable.

The support arm 30 is pivotally supported on both left and right side portions of the cabinet 20 by a pivot shaft 32 in the left-right direction, and a lower portion 33 pivotally supported by the pivot shaft 32 and provided below the pivot shaft 32, Underlay 33
A downwardly extending portion 34 extending obliquely downward and rearward from the lower end of the
An inwardly extending portion 35 that extends inwardly from the rear end of the downwardly extending portion 34, a rearwardly extending portion 36 that extends rearwardly from the innerward end of the inwardly extending portion 35, and a rearwardly extending portion. The portion 36 has a rising portion 37 that rises slightly rearward from the rear end portion.

The pivot 32 is substantially at the same position as the front wheel 8 in the front-rear direction.

The rear extension 36 is the handle wheel 27 in the left-right direction.
Are arranged between the both side ends of the vehicle so as to be positioned between the legs of the driver on the seat 5, so that the rear extension portion 36 does not interfere with the operation of the vehicle and the rear extension portion 36 The vertical gap between the front floor cover 21 and
The rear extension 36 is also used when the driver gets on and off the forklift.
Has been designed so as not to hinder.

Left and right mounting shafts 39 are fixed to the rear end of the rising portion 37, and the left and right side parts of the mounting shaft 39 have a smaller diameter than the central part. A pair of fixed left and right tubular bodies 40 are rotatably fitted on the outside of the seat 5
Indicates a substantially horizontal use posture, as shown by the solid line in FIG.
As shown by the phantom line in FIG. 1, the posture is freely changed to an inverted posture in which it is in contact with the handle wheel 27.

A projecting plate 42 projecting rearward is fixedly mounted on the mounting shaft 39, and the seat 5 in the use posture is held by the projecting plate 42.

Further, brackets 44 project from the left and right sides of the cabinet 20 to the front and rear, respectively, so that the lower portions of the support arms 30 are provided.
It is arranged so as to sandwich 33 in the front-back direction. still,
The cabinet 20 and each bracket 44 are arranged at substantially the same position as the front wheel 8 in the front-rear direction.

As shown in FIG. 3, an adjusting bolt 46 is screwed into the lower end of each bracket 44 so as to be able to move forward and backward.
It is fixed by a fixing nut 47, and the tip of the adjusting bolt 46 is rotatably held by a mounting plate 48.

The mounting plate 48 faces the lower portion 33 of each support arm 30, and a holding spring 50 that holds the support arm 30 and the seat 5 in a vertically swingable manner between each mounting plate 48 and the lower portion 33. The shock absorbers 51 are respectively installed.

The holding spring 50 is wound around the shock absorber 51 and is inserted in a resilient manner.

The safety frame 6 is of a four-pillar type and is erected from the frame 11 and the cabinet 20.

The counterweight 7 is attached to the rear end of the frame 11 and is located behind the frame 11.

The lift device 2 is arranged in front of the vehicle body 1 and is pivotally supported by the front axle 15 to support the tilt cylinder.
An outer mast 54 fixed by 53, an inner mast 55 that is vertically movable on the outer mast 54, a fork 56 that is vertically movable on the inner mast 55, and the like.

According to the embodiment configured as described above, when the driver sits on the seat 5 during operation of the forklift,
Depending on the weight of the driver, the seat 5 should be almost horizontal.
Move the adjustment bolt 46 back and forth to support the holding spring 50
The force acting on the seat 5 is adjusted, whereby the seat 5 can be made substantially horizontal regardless of the weight of the driver, and the forklift can be operated well.

By the way, when the forklift is traveling, the forklift vibrates up and down like a seesaw around the front wheel 8 mainly due to the unevenness of the road surface and the like.
20 moves back and forth.

As a result, the mounting portions of the support arm 30, the holding spring 50 and the shock absorber 51 in the vehicle body 4 also move up and down.

At this time, due to the inertia, the support arm 30 and the seat 5 oscillate in the vertical direction relative to the vehicle body 4 in a phase opposite to the vertical movement of the mounting portion while resisting the holding spring 50 and the shock absorber 51. It moves (vibrates) and absorbs the vertical movement of the mounting portion to maintain the coordinate 5 at a constant height with respect to the road surface.

In this case, if the mounting portion is the rear portion of the vehicle body 4 that moves largely up and down during traveling, the support arm 30
Even if oscillates, the vertical movement of the mounting portion cannot be sufficiently absorbed.

Therefore, the seat 5 largely moves up and down with respect to the road surface, the riding comfort is poor, and the driver is easily tired.

On the other hand, according to the present invention, the above-mentioned mounting portion is a portion that is substantially at the same position as the front wheel 8 in the front-rear direction, and does not move significantly up and down during traveling.

Therefore, the swing of the support arm 30 sufficiently absorbs the vertical movement of the mounting portion, so that the seat 5 is
It does not move up and down greatly, the riding comfort is good, and the driver does not easily get tired.

Further, when the vibration of the forklift becomes small or ends, the swing of the support arm 30 is also damped early by the shock absorber 51.

Further, when the bonnet 22 is opened and the engine 12 and the like are inspected, the seat 5 is rotated forward around the mounting shaft 39,
As shown by the phantom line in FIG. 1, if the seat 5 is in an inverted posture, the seat 5 does not interfere with the opening and closing of the hood 22, and the hood 22 can be easily opened to inspect the engine 12 and the like.

Although the present invention is applied to a forklift in the embodiment, the present invention is also applicable to a work vehicle provided with a work device arranged in front of the vehicle body.

(Effects of the Invention) As described in detail above, according to the present invention, even when the work vehicle vibrates up and down like a seesaw around the front wheel, the seat vibrates greatly against the road surface. In addition, the ride comfort is good and the driver is less likely to get tired.

Further, according to the second aspect, the seat lower part can be easily inspected by rotating the seat forward so as to be in the inverted posture.

Furthermore, according to claim 3, if the force acting on the support arm of the holding spring is adjusted according to the weight of the driver, the seat can be maintained substantially horizontal regardless of the weight of the driver, The work vehicle can be driven well.

[Brief description of drawings]

The drawing shows one embodiment of the present invention, FIG. 1 is a side view, and FIG.
The drawing is a plan view, and FIG. 3 is a partially enlarged cross-sectional view of the main part of FIG. 1 ... Vehicle body, 2 ... Lift device (working device), 4 ...
… Car body, 5 …… Seat, 30 …… Support arm, 32 …… Pivot shaft, 39 …… Mounting shaft, 46 …… Adjusting bolt, 47 …… Fixing nut, 48 …… Mounting plate, 50 …… Holding spring , 51 …… Shock absorber.

Claims (3)

(57) [Scope of utility model registration request] 1. A work vehicle including a work device disposed in front of the vehicle body, wherein a lateral pivot shaft is provided at a portion of the vehicle body substantially in the same position as the front wheel in the front-rear direction. A support arm that is provided on the pivot shaft and extends rearward is swingably provided in the vertical direction, and a seat is provided in the rear portion of the support arm. A. A holding spring for swingably holding the support arm and the seat, and b. A seat device for a work vehicle, which is equipped with a shock absorber. 2. A seat is rotatably provided at a front end portion thereof at a rear end portion of a support arm by a mounting shaft in a left-right direction, and the seat is rotated in a substantially horizontal use posture and forward from the use posture. 2. The seat device for a work vehicle according to claim 1, wherein the seat device is capable of changing its posture to a substantially inverted inverted posture. 3. The seat device for a work vehicle according to claim 1, further comprising an adjusting device for adjusting a force acting on the support arm of the holding spring.