JPH1098932A - Seat device for work truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise a seat to a position as high as possible and to rotate and lock the seat to an optional position in a work truck for which the seat is arranged on a traveling part through an elevating and lowering mechanism. SOLUTION: Links 35 and 36 are pivotally connected in a diamond shape between the traveling part A and the seat 13, a screw shaft 42 is horizontally disposed between left and right pivotal connection parts, a motor 43 is connected to the screw shaft and the links are elevated and lowered by the drive of the motor 43. Or the link is pivotally connected in an X shape between the traveliqng part and the seat, the screw shaft is horizontally disposed between link pivotal supporting parts on an upper side and a lower side, the motor is connected to the screw shaft and the link is elevated and lowered by the drive of the motor. Also, the seat is arranged rotatably to a machine body, a lock device D is arranged between the seat and a pivotal supporting shaft for freely rotatably pivotally supporting the seat and the lock device D is locked and unlocked by a pedal 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work cart provided with a seat on a self-propelled vehicle body, which can be moved up and down to perform agricultural work and indoor work.

[0002]

2. Description of the Related Art Conventionally, a wheel-type or crawler-type traveling device is driven by a motor or an engine so as to be able to work while sitting on an orchard shelf while pruning, pruning, picking, and the like. 2. Description of the Related Art The technology of a work cart in which a seat is mounted on an airframe and the seat can be rotated, moved left and right, or adjusted in height is known. For example, Japanese Utility Model Publication No. 3-37374 and JP-A-7-298750.
And JP-A-8-37815.

[0003]

However, Japanese Patent Application Laid-Open No. Hei 8
In the technique of -37815, the seat is rotated, but there is no locking mechanism, and the seat is unstable. In the techniques of JP-A-7-298750 and JP-A-8-37815, the seat can be raised and lowered. The height can be adjusted, but the lever is unlocked by operating the lever, and the height is adjusted by lifting or pushing the seat by hand, so fine adjustment is difficult and operation is troublesome I was

[0004]

The present invention uses the following means in order to solve the above problems. That is, in a work vehicle in which a seat is arranged on a traveling unit via an elevating mechanism, a rhombic link is pivotally connected between the traveling unit and the seat, and a screw shaft is laterally suspended between the left and right pivots, A motor was connected to the screw shaft, and the link was driven up and down by driving the motor. Alternatively, a link is pivotally connected in an X shape between the traveling unit and the seat, a screw shaft is laid across the upper or lower link pivot, and a motor is connected to the screw shaft,
The link is driven up and down by driving the motor.

Further, a seat is rotatably arranged with respect to the body, and a lock device is arranged between the seat and a pivot shaft for rotatably supporting the seat, and the lock device is locked and locked by a pedal. This is to cancel.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The problems and means to be solved by the present invention are as described above. Next, an embodiment of the present invention shown in the attached drawings will be described. 1 is a side view of a work vehicle employing the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a side view of a seat rotation lock portion, FIG. 4 is a front view of a release portion, and FIG. FIG. 6 is a front view showing another embodiment of the lifting mechanism, and FIG. 7 is a front view showing an embodiment in which the traveling drive and the lift drive are driven by one motor.

Referring to FIGS. 1 and 2, the entire structure of the work cart of the present invention will be described. The work cart has a seat C disposed on a traveling unit A via an elevating mechanism B, and the traveling unit A is a crawler type traveling device, but may be a wheel type. In the traveling section A, a driving sprocket 2 is disposed at the front of the track frame 1 on each of the left and right sides, and a driven wheel 3 is disposed at the rear to apply tension, and a play is provided between the driving sprocket 2 and the driven wheel 3. The rolling wheels 4, 4, 4 are arranged, and the driving sprocket 2, the driven wheel 3, and the idler wheels 4, 4, 4 are arranged.
The crawler (crawler) 5 is wound around.

A body frame 6 is fixed on the track frame 1, and drive motors 7, 7 are arranged on both front sides of the body frame 6, and an output shaft of the drive motor 7 is connected to a drive shaft 9 via a speed reducer. The driving sprocket 2 is fixed to the driving shaft 9 to drive the crawler type traveling device. A battery 10 is mounted on the body frame 6 at the rear of the motors 7,7.

Further, a support cylinder 11 is erected at the center of the body frame 6, and a guide shaft 12 is inserted into the support cylinder 11. A seat base 14 is rotatably disposed at an upper end of the guide shaft 12. The lower surface of the seat 13 is fixed on the seat base 14. Handrails 30 are provided on both sides of the seat 13, and a seat base 14 on the side of the handrail 30 is provided.
A traveling operation lever 31 and a lifting operation switch 32 are provided above. However, the mounting positions of the traveling operation lever 31 and the lifting operation switch 32 are not limited, and the handrail 3
0 right or left or forward or on the handrail 30.

The seat base 14 includes a guide shaft 12.
3 and 4, the lock mechanism D is provided at the upper end of the guide shaft 12 with the pipe portion 14a of the seat base 14, as shown in FIGS.
A lock pin 16 is inserted into the pipe portion 14a in a radial direction, and the tip of the lock pin 16 is brought into contact with a concave portion formed on the outer periphery of the upper portion of the guide shaft 12 to be locked. ing. An intermediate portion of the lock pin 16 is supported by a support 17 fixed to the seat base 14,
At its front part, the arm 18 is locked to the lock pin 16, and the arm 18 and the lock pin 16 are urged rearward by a spring 19. A grip 1 is provided at the front end of the lock pin 16.
6a is provided so that the grip 16a can be unlocked by pulling it by hand. However, the configuration for locking is not limited, and it may be configured such that it cannot be tightened and rotated like a brake.

The other end of the arm 18 is connected to the pedal 2
The connecting portion between the arm 18 and the pedal 20 is pivotally supported by a support shaft 21. The front end of the pedal 20 protrudes above the step 15 fixed to the seat base 14, and can be locked by the locking pin 22 in a position where the pedal 18 is depressed and the arm 18 is rotated to unlock. I have to. In other words, a locking pin 22 is suspended laterally below the middle part of the pedal 20, and the locking pin 22 is
The tip of the locking pin 22 is obliquely cut into an inclined portion 22a.
Is inserted into an insertion hole provided below the release pedal 24.

In addition, the step 15 corresponds to the seat base 14.
The seat 13 is moved up and down at the same time when the seat 13 is moved up and down or rotated, so that the work can be performed with the foot on. As shown in FIG. 2, the step 15 is made wider than the periphery of the front portion of the main body cover 25 so as to cover the step, so that the guard can be made around the step. 15 so that it does not get caught between itself and the main body cover 25 when ascending or descending.

With such a configuration, in a normal state, the seat 13 is locked by the lock mechanism D and cannot be rotated. If the user wants to change the direction while working, the user depresses the pedal 20, slides the lock pin 16 forward through the arm 18, and releases the engagement with the concave portion above the guide shaft 12. At this time, when the pedal 20 pushes down the inclined part 22a and descends and rotates below the locking pin 22, the locking pin 22 returns by the urging force of the spring 23,
It is kept in the unlocked state. In this way, the seat 13 can be turned at any angle. When the release pedal 24 is depressed to lock at that position, the insertion hole is
2a, the locking pin 22 is retracted, the engagement with the pedal 20 is released, the arm 18 and the lock pin 16 are pushed rearward by the urging force of the spring 19, and the pedal 20 returns to its original position. 16 is the guide shaft 12
And lock again. During this rotation, the pedal 20 and the release pedal 24 also rotate integrally, and the pedal 20 or the release pedal 24 is depressed with the foot to perform the lock and release operations. Thus, the seat 13 can be rotated to the optimum position.

As shown in FIG. 1 and FIG. 2, the structure for raising and lowering the seat 13 includes pivot brackets 3 on both front and rear (or left and right) sides of the support cylinder 11 on the body frame 6.
Are provided, and the lower portions of the four links 35 are pivotally supported by pivot pins 40. On the other hand, four links 36 are provided on both front and rear (or left and right) sides of the seat base 14.・
.. Are pivotally supported by pivot pins 41, 41 and the lower portions of the links 36, 36.
Are pivotally supported on both sides of the pivot shafts 37, and the links are arranged in a pantograph shape. The pivot shaft 37
Numerals 37 are arranged in parallel in the front-rear direction, and nuts 39 are fixed to the pivot shaft 37 and an intermediate portion of the pivot shaft 37.
A screw shaft 42 is screwed to 39. One of the nuts 39 is a reverse screw, and the screw shaft 42 has a forward screw on one side and a reverse screw on the other side at the center, and a motor 43 is connected to one end of the screw shaft. By operating the lifting operation switch 32, normal rotation or reverse rotation can be performed.

The seat 13 can be rotated at the lower part of the support cylinder 11 without rotating the seat 13 at the upper part of the guide shaft 12, as shown in FIG. That is, the swivel 27 is rotatably supported on the body frame 6 via a thrust bearing 26, and is rotatably supported between the support cylinder 11 and the body frame 6 via a bearing 28. Fixed wheel gear 29,
A worm 44 is rotatably supported on the body frame 6 so as to mesh with the wheel gear 29 so that the worm 44 can be driven forward and reverse by a motor 45. The motor 45 is provided with a turning switch 38 provided on the side of the seat 13. To enable rotational drive operation. In this way, it is possible to rotate easily by operating the switch without moving the body.

As another embodiment of the lifting mechanism B, as shown in FIG. 6, four stays 46, 46...
The screw shafts 47 are rotatably suspended in the front-rear direction between 46 and 46. The screw shafts 47 have a forward screw on one side and a reverse screw on the other side from the center. .. Are screwed on both sides of the screw shafts 47, 47, and the nuts 48
The lower ends of the links 49, 49
·································································································································· To provide this X
A pair of front and rear links are arranged to form a scissor link type lifting mechanism.

Also, rails 53 are horizontally provided horizontally parallel to the front and rear of the seat base 14 and horizontally.
The rollers 52 are fitted to 3 so that they can slide left and right. A guide rod 54 is provided vertically below the left and right center of the lower surface of the seat base 14, and the guide rod 54 has a guide hole 54a opened in a vertical direction, and the pivot 51 is inserted into the guide hole 54a. 13 does not move left and right. A motor 56 is disposed on the body frame 6, and a power transmission means 55 such as a gear or a sprocket is interposed between the motor 56 and the center of the screw shaft 47. 47 can be driven, and the link 4
The space between 9.49 is narrowed or widened so that the seat 13 can be moved up and down.

The screw shaft 47 can be driven by a drive motor 7 for driving the crawler traveling device as shown in FIG. That is, the reduction case 57 containing the output shaft of the drive motor 7 is arranged vertically so that the vehicle height is as high as possible, and the drive shaft 9 and the power take-out shaft 60 protrude below the one side reduction case 57. A clutch is disposed in a power transmission path to the drive shaft 9 and the power take-out shaft 60 so that they can be disconnected and connected independently. Then, a sprocket 61 is fixedly mounted on the power take-off shaft 60, a sprocket 62 is also fixed at the center of the screw shaft 47, and a chain 63 is wound between the sprockets 61, 62 so that the traveling operation lever 31 and the lifting / lowering operation are performed. By operating the switch 32, the clutch and the drive motor 7 are operated so that the seat 13 can be moved up and down and run. In this way, it is possible to drive up and down and travel by one motor, to reduce costs,
Extra space is omitted. However, the screw shaft 47 and the rail 53 can be arranged upside down. Alternatively, the guide shaft 54 can be replaced by a support cylinder and a guide shaft. In addition, the lifting mechanism B is configured to move up and down by rotating a screw shaft by a motor. However, an electric cylinder is interposed between the body frame 6 and a link or a pivot shaft, and the lifting mechanism B is moved up and down by the electric cylinder. Can also be configured.

[0019]

According to the present invention, the following effects can be obtained by the configuration described above. That is, the link is pivotally connected between the running portion and the seat in a diamond shape or in an X shape, a screw shaft is laid between the left and right pivot portions, and the screw shaft is rotated by driving a motor. The link is configured to drive up and down, so that the up and down distance can be lengthened, and it is possible to sit and work at a high position, and because the seat is located in the center of the running section, Now I can work. In addition, since it is moved up and down by the rotation of the screw shaft, the height can be finely adjusted, and it can be easily adjusted to a desired height.

Further, the seat is rotatably arranged with respect to the body, and a locking device is arranged between the seat and a pivot shaft for rotatably supporting the seat, and the locking device is locked and locked by a pedal. I decided to release it, so I step on the pedal with my foot,
Rotation can be allowed or locked by operating only the feet, hands can concentrate on the work, the seat can be rotated and locked without interrupting the work, it is easy to rotate to the desired position, Work efficiency does not decrease.

[Brief description of the drawings]

FIG. 1 is a side view of a work vehicle employing the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a side view of a seat rotation lock portion.

FIG. 4 is a front view of a release portion.

FIG. 5 is a side view showing another embodiment of the seat rotation mechanism.

FIG. 6 is a front view showing another embodiment of the lifting mechanism.

FIG. 7 is a front view showing an embodiment in which a traveling drive and a lifting drive are driven by one motor.

[Explanation of symbols]

 A running section B lifting mechanism C seat section D locking mechanism 13 seat 16 lock pin 20 pedal 24 release pedal 35.36 link 49 link 42.47 screw shaft 43.56 motor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yasuo Moriyasu 428 Enami, Okayama

Claims (3)

[Claims] 1. A work vehicle in which a seat is arranged on a traveling unit via an elevating mechanism, a link is pivotally connected between the traveling unit and the seat in a rhombic shape, and a screw shaft is horizontally disposed between the left and right pivots. A seat device for a work vehicle, wherein the seat device is connected to a motor, and the link is moved up and down by driving the motor. 2. A work vehicle in which a seat is arranged on a traveling unit via an elevating mechanism, a link is pivotally connected between the traveling unit and the seat in an X shape, and a screw is provided between the upper or lower link pivoting portion. A seat device for a work vehicle, wherein a shaft is mounted horizontally, a motor is connected to the screw shaft, and a link is driven up and down by driving the motor. 3. A work cart in which a seat is arranged on a traveling unit via an elevating mechanism, wherein the seat is rotatably arranged with respect to the body, and a seat and a pivot shaft for rotatably supporting the seat are provided. A seat device for a work vehicle, wherein a lock device is disposed between the lock devices and the lock device is locked and unlocked with a pedal.