JPH10127111A - Seat device for work truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dissolve the problems that the entire height of an elevating/ lowering mechanism at the time of enlarging the stroke of vertical movement since the conventional elevating/lowering mechanism of a seat uses a gas spring and fine adjustment is difficult, operations are troublesome and work is required to be temporarily interrupted at the time of height adjustment since unlocking is performed by operating a lever and the height is adjusted by lifting or pushing down the seat with hands in the case of elevating/lowering it. SOLUTION: The elevating/lowering mechanism B is constituted at least of a supporting cylinder 51 erected on a machine body frame upper surface and a guide shaft 53 slidably fitted to the supporting cylinder 51 and the supporting cylinder 51 is formed in an almost L shape in a side face view. Also, plural spherical body members are incorporated in one line, the spherical body members arranged in one line are moved in the line direction for the vertical movement of the guide shaft 53 and the seat 13 is elevated/lowered.

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 or adjusted in height is known. For example, the techniques disclosed in Japanese Utility Model Publication No. 3-37374, JP-A-7-298750, and JP-A-8-37815.

[0003]

However, Japanese Patent Application Laid-Open No.
In the technique of -298750, since a gas spring is used for a device for elevating a seat, if an attempt is made to increase the elevating stroke, the overall height of the elevating mechanism is increased. Also, JP-A-7-298750 and JP-A-8-3
In the technology of No. 7815, the seat can be raised and lowered and the position can be adjusted to any height, but the lever is unlocked and the height is adjusted by lifting and pushing the seat by hand Therefore, fine adjustment was difficult and operation was troublesome, and it was necessary to temporarily suspend work when adjusting the height.

[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, the elevating mechanism includes at least a support cylinder erected on the upper surface of the body frame and a guide shaft slidably fitted in the support cylinder. A seat is disposed on the guide shaft, the support tube is formed substantially in an L shape in side view, and a plurality of spherical members are built in a line in the support tube, and are pushed to the end of the support tube. A member is arranged, and the spherical member is pushed and pulled by the pushing member so that the seat can be moved up and down.

[0005] Further, a seat-side support cylinder provided with the elevating mechanism at least on the lower surface of the seat, an airframe-side support cylinder erected on an airframe, and a screw connecting the seat-side support cylinder and the body-side support cylinder. A worm wheel was fixedly mounted on the screw shaft, the worm was meshed with the worm wheel, and the worm was connected to a pedal or an electric motor.

[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. FIG. 1 is a side view of a work vehicle employing the invention according to claim 1, FIG. 2 is a plan view thereof, FIG. 3 is a side sectional view of the same lifting mechanism, and FIG. 4 is a work vehicle employing the invention according to claim 2. 5, FIG. 5 is a plan view, FIG. 6 is a side sectional view of the lifting mechanism, FIG. 7 is a plan view of the same, and FIG. 8 is a side view showing another embodiment of the lifting mechanism of the invention according to claim 1. , FIG. 9 is the same rear view, and FIG.
And FIG. 11 is a front sectional view of a third embodiment of the lifting mechanism according to the present invention.

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 section A via a lifting mechanism B, and the traveling section A is a crawler traveling apparatus, but may be a wheel traveling apparatus.
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. Place the wheels 4,4,4,
These drive sprocket 2, driven wheel 3, idler wheel 4, 4,.
A crawler (crawler track) 5 is wound around 4.

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.

A substantially L-shaped support cylinder 51 is provided at the center of the body frame 6 through the step 15, and an intermediate cylinder 52 is mounted on the support cylinder 51, and a guide shaft is mounted on the intermediate cylinder 52. The seat base 50 is rotatably arranged at the upper end of the guide shaft 53 so that the seat base 50 can be rotated and locked to an arbitrary position with respect to the guide shaft 53, The lower surface of the seat 13 is fixed on the seat base 50. The seat 13
On both sides of the handrail 30, a handrail 30 and a traveling operation lever 31 and a lifting / lowering operation switch 32 are provided on a seat base 50 on the side of the handrail 30. However, the traveling operation lever 31
The mounting position of the lifting / lowering operation switch 32 is not limited, and may be right or left of the handrail 30, in front of the handrail 30, or on the handrail 30.

A rotating nut 54 is provided at the rear end of the support cylinder 51.
Are rotatably fitted, a rotation shaft 59 of a motor 55 is fixed to the rear end of the rotation nut 54, and the rotation nut 54 rotates with the rotation of the motor 55.

In addition, the step 15 is a step of
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.

Next, the lifting mechanism B will be described with reference to FIG. The support cylinder 51 is a tubular member, is formed in a substantially L-shape in side view, and includes a horizontal portion fixed to the body frame 6 and a vertical portion erected at the front end of the horizontal portion. An intermediate cylinder 52 is slidably fitted into the upper part of the vertical part.
A guide shaft 53 is slidably fitted from above 2. The lower ends of the guide shaft 53 and the intermediate cylinder 52 are formed in a brim shape.
2, the intermediate tube 52 is configured not to fall off the support tube 51. A rotation nut 54 is rotatably fitted to the rear end of the horizontal portion of the support cylinder 51, and a screw shaft 56 as a pushing member screwed with the rotation nut 54 projects into the horizontal portion of the support cylinder 51. A push plate 57 is fixed to the front end of the screw shaft 56. A motor 5 is provided at the rear end of the rotary nut 54.
5, the rotation shaft 59 and the rotation nut 5
4 are configured to rotate integrally.

A plurality of balls 60, 60..., Which are spherical members, are built in the support cylinder 51, and the balls 60, 60. And are slidable in the axial direction.
The inner diameter of the intermediate cylinder is such that the balls 60 can slide freely and can be arranged in a line. In the support cylinder 51, the inner diameter of the support cylinder 51 is such that the intermediate cylinder 52 can slide freely and the balls 60, 60. Are dimensioned so that they can be arranged in a line (inner diameter 1). In the other range, the inner diameter of the support cylinder 51 is such that the balls 60 can slide freely and are arranged in a line. It is a dimension (inner diameter 2) that can be lined up.

A guide cylinder 61 is fixedly provided at the lower end of the intermediate cylinder. The guide cylinder 61 is a funnel-shaped cylindrical body whose upper end is the same as the inner diameter of the intermediate cylinder 51 and whose lower end is the same as the inner diameter 1 of the support cylinder 51. By the guide cylinder 61, the balls 60, 60,.
Can smoothly enter when entering the intermediate cylinder 52. However, the guide cylinder 61 need not be provided if the balls 60 can smoothly enter the intermediate cylinder 52 without providing the guide cylinder 61. A groove 56a is provided in the screw shaft 56 in the axial direction, and a pin 58 fixed to the support cylinder 51 is fitted into the groove 56a so that the screw 56 does not rotate.

When the seat 13 is located at the lowest position in the lifting mechanism B configured as described above, the screw shaft 56 and the push plate 57 are located at the rearmost position where they can be located, and the guide shaft 53 is an intermediate cylinder. 52, and the intermediate cylinder 52 is in a state of being incorporated in the support cylinder 51. When the lifting operation switch 32 is turned ON in this state, the motor 55 rotates and the rotation nut 54 also rotates. When the rotation nut 54 rotates, the screw shaft 56 screwed with the rotation nut 54 extends forward, whereby the push plate 57 pushes the balls 60,... Forward. The pushed balls 60, 60... Enter the intermediate cylinder 52 from the support cylinder 51 and push up the guide shaft 53. The guide shaft 53 extends from the intermediate cylinder 52, and when the lower end of the guide shaft 53 and the upper end of the intermediate cylinder 52 are locked and cannot be further extended, the intermediate cylinder 52 extends from the support cylinder 51. Thereafter, when the lower end of the intermediate cylinder 52 and the upper end of the support cylinder 51 are locked and the intermediate cylinder can no longer be extended, the seat 13 is located at the highest position, and a sensor (not shown) changes this state. Sense and motor 5
The rotation of No. 5 stops.

Conversely, when the seat 13 is located at the highest position and the motor 32 is operated so that the motor rotates in the opposite direction, the screw shaft 56 starts moving backward. The balls 60 are screw shafts 56.
Is moved backward by being pushed by the guide shaft 53 by the amount moved backward. In this way, the seat 13 descends, and when it reaches the lowermost position, a sensor (not shown) detects this state and the rotation of the motor 55 stops.

The elevating mechanism B performs the elevating operation in this manner. When the seat 13 is located at the lowest position, most of the balls 60 are built in the horizontal portion of the support cylinder 51. Therefore, the height of the lifting mechanism B can be kept low. In addition, the provision of the intermediate cylinder 52 makes it possible to increase the lifting stroke with respect to the height of the lifting mechanism. Although one intermediate cylinder 52 is used in this embodiment, the number of intermediate cylinders is not limited to one, and a plurality of intermediate cylinders may be used.

Next, the lifting mechanism D will be described with reference to FIGS. 4, 5, 6, and 7. FIG. An airframe-side support tube 65 is erected on the airframe 6 and a seat-side support tube 66 is provided on the lower surface of the seat base 50, and the airframe-side support tube 65 and the seat-side support tube 6 are provided.
6 are connected by a screw shaft 67. An upper screw portion 67a formed above the center of the screw shaft 67 in the axial direction is screwed with a lower portion of the seat-side support tube 66, and a lower screw portion 67b formed below the center in the axial direction is connected to the body-side support tube 65. However, the screws of the upper screw portion 67a and the lower screw portion 67b are formed in opposite directions (reverse screws). A worm wheel 75 is fitted integrally with the screw shaft 67 at a vertically central portion of the screw shaft 67.

The worm wheel 75 meshes with a worm 76 having an axial center in the left-right direction.
A sprocket 68 is fixedly mounted on one end of the rotary shaft 79 of FIG. A support arm 77 projecting forward is fixed below the seat-side support cylinder 66, and a drive sprocket 69 having a rotation shaft 78 is rotatably supported on the support arm 77. The support arm 77 extends from one surface of the driving sprocket 69 to the other surface, bypassing the front of the driving sprocket 69, and pivotally supports the rotation shaft 78 of the driving sprocket 69 from both sides. The pedal arm 7 is provided at both ends of the rotating shaft 78 of the driving sprocket 69.
4 and 74 are fixed so that their tips are opposite to each other in the radial direction, and pedals 71 and 71 are rotatably attached to the tips of the pedal arms 74 and 74. The sprocket 68 and the driving sprocket 6
A chain 70 is wound around 9 and tensioned by a tension sprocket (not shown).

The joint 79a rotatably attached to the other end of the rotating shaft 79 of the worm 76 is provided with a support tube 7
2 is slidably supported by the screw shaft 67, and is rotatably supported by the screw shaft 67. An arm 73 for preventing rotation is vertically slidably fitted on the support tube 72, and the tip thereof is supported on the seat side. By fixing to the side of the cylinder 66, the seat-side support cylinder 66 is prevented from rotating. The lower end of the support tube 72 is fixed to the body frame 6 so as to be rotatable about the seat-side support tube 66. Therefore, the direction of the seat 13 can be changed by rotating the support tube 72.

Since the lifting mechanism D is constructed as described above,
When the operator operates the pedals 71 with the feet to rotate the sprocket 69, the worm 76 also rotates, and the rotation is transmitted to the worm wheel 75 meshed with the worm 76, so that the screw shaft 67 also rotates. When the screw shaft 67 rotates, the upper screw portion 67a and the lower screw portion 67b are formed with screws in opposite directions, respectively.
“a” extends from the seat-side support tube 66 and the lower screw portion 67 b extends from the fuselage-side support tube 65 with rotation. With this operation, the seat 13 is raised. At this time, the pedal 71
Since 71 rises with the seat 13, the pedals 71 can be kept in an appropriate position regardless of the height of the seat. When the seat 13 is lowered, the pedals 71 are operated so as to rotate the screw shaft 67 in the opposite direction to the above case, so that the upper and lower screw portions 67a and 67b are moved to the seat-side support cylinder 66 and the body-side support cylinder. 65 are fitted together with the rotation, and the seat 13 can be lowered.

In the above-described embodiment, the rotation of the worm 76 is performed by the feet of the operator.
A motor may be connected to the rotating shaft to rotate the worm 76 electrically. The rotation of the screw shaft 67 is controlled by the worm 7.
6 and the worm wheel 75,
When rotating with a foot, not much force is required, and when rotating with a motor, it is possible to rotate with a small motor. As described above, the seat 13 can be easily moved up and down by the operator's feet or an electric force such as a motor, so that the operator can work using both hands while moving the seat up and down.

Next, a lifting mechanism E which is another embodiment of the lifting mechanism for raising and lowering the seat will be described with reference to FIGS.
Support plates 83 are fixedly provided on the front and rear portions of the lower surface of the seat base 50, and support bars 84a are provided on left and right portions of the lower surface of the support plate 83 so as to protrude downward.
The support rods 84a, 84a,.
... Slidably fitted from above, connecting pipes 84b and 8
4b are support pipes 84 fixed on the body frame 6.
· · · · · · · · Slidably fitted from above. The support plates 83 rotatably support the screw shaft 81 at the center in the left-right direction. One end of a rotary arm 82a is fixed to the rear end of the screw shaft, and a rotary lever 82 is rotatably attached to the other end of the rotary arm.

In the portion of the screw shaft 81 located between the support plates 83, a rear screw portion 81a is formed from the center in the axial direction to a rear portion, and a front screw portion 81b is formed at a front portion. A rear moving arm 85a is screwed into the rear screw portion 81a, and a front moving arm 85b is screwed into the front screw portion 81b, respectively. The front and rear support arms 87 are provided on the body frame 6.
b · 87a are provided upright, and the screw shaft 81 is seen in plan view.
Symmetrically with respect to the axis of the axis and the center in the axial direction, and are appropriately spaced from each other. The distance between the front and rear support arms 87b and 87a is equal to the distance between the front and rear movement arms 85b and 85a.
The distance a is narrower than the distance when the distance is the largest.

The lower end of the rear moving arm 85a and the upper end of the rear supporting arm 87a are rotatably connected by a connecting arm 86, and the lower end of the front moving arm 85b and the upper end of the front supporting arm 87b are connected. It is rotatably connected by a connecting arm 86. Also, a rear screw portion 81a of the screw shaft 81
The front screw portion 81b and the front screw portion 81b are formed with screws in opposite directions. For example, when the screw shaft 81 is rotated in one direction, the front and rear moving arms 85b and 85a move closer to each other, and when rotated in the opposite direction. Arm 85b
85a will move away from each other.

In the lifting mechanism E configured as described above, when the seat base 50 is located at the lowest position, the front and rear moving arms 85b and 85a are in the most distant state, and the connecting arms 86 and 86 are It is substantially parallel to the horizontal direction. When the rotation lever 82 is operated to rotate the screw shaft 81 in a direction in which the front and rear movement arms 85b and 85a approach each other, the connection arms 86 and 86 rotate upward,
The support rods 84a, 84a,.
.. Extend from the connecting tubes 84b, 84b,... And the support tubes 84, 84,. When the rear moving arm 85a, the connecting arm 86, and the rear supporting arm 87a are aligned, and the front moving arm 85b, the connecting arm 86, and the front supporting arm 87b are aligned, the seat base 50 is positioned at the highest point. Will be located. At this time, the connecting arms 86 are in a state parallel to the vertical direction.

Conversely, when lowering the seat base 50, when the screw shaft 81 is rotated in a direction opposite to the above case, the front and rear moving arms 85b and 85a move in directions away from each other, and the lowering of the seat base 50 is stopped. It becomes possible. As described above, the elevating mechanism E moves up and down by rotating the connecting arms 86, so that the height of the elevating mechanism can be kept low when the connecting arm 86 is at a low position where the connecting arm 86 is substantially horizontal. .

Next, the lifting mechanism F will be described with reference to FIGS. A gas spring 91 is attached to the lower surface of the seat base 50, and a support cylinder 90 is mounted on the body frame 6.
The gas spring 9 is set up from above the support cylinder 90.
1 is inserted. On the side surface of the support cylinder 90, a substantially U-shaped hole 93 is formed in a side view, and the lower locking portion 93a and the upper locking portion for locking a locking lever 94 described later are formed in this hole. 93b are formed. At the lower part of the side surface of the gas spring, a locking lever 94 is erected outside in the radial direction, and protrudes outside the support cylinder 90 through the hole 93. The gas spring 91 is urged upward by a spring 95.

In the lifting mechanism F thus configured,
The gas spring 91 can be fixed at a low place by locking the locking lever 94 to the lower locking portion 93a of the hole 93. When the lock at the lower locking portion 93a is released and the locking lever 94 is rotated to the vertical hole 93c, the gas spring 91 is urged by the spring 95 so that the locking lever 94 is turned into the vertical hole 93.
It rises until it reaches the upper end of c. When the locking lever 94 is locked to the upper locking portion 93b at this height, the gas spring 91 can be fixed at a high place.

With this mechanism, the stroke of raising and lowering the seat base can be doubled in comparison with the case where only the gas spring 91 is used as the raising and lowering mechanism, even though the height of the raising and lowering mechanism is almost the same. It becomes. That is, for example, if the up-and-down stroke of the gas spring 91 is 200 mm, the up-and-down stroke of the seat base 50 will be 2 in the up-and-down mechanism provided only with the gas spring 91.
00 mm. On the other hand, in the case of the present embodiment, for example, the interval between the lower locking portion 93a and the upper locking portion 93b is 200
mm, the gas spring 91 has a stroke of 200 mm with the locking lever 94 locked at the lower locking portion 93a, and raises the gas spring 91 by 200 mm to raise the locking lever 94. Even in the state of being locked to the stop portion 93b, it has a stroke of 200 mm. Therefore, as the elevating stroke of the elevating mechanism, the gas spring 9
400mm in total with 200mm of 1 stroke
It has a stroke of

[0031]

According to the present invention, the following effects can be obtained by the configuration described above. That is, a plurality of balls are arranged in a row in a support tube having a substantially L-shape in a side view as standing upright on the upper surface of the body frame 6 like the elevating mechanism B, and the balls are moved in the row direction to raise and lower the guide shaft. Since the seat can be moved up and down, the elevating stroke with respect to the height of the elevating mechanism can be increased as compared with a case where only the gas spring is used for the elevating mechanism.

Further, a seat-side support tube provided with a lifting mechanism on the lower surface of the seat, and a body-side support tube provided upright on the body frame,
The seat-side support tube and the body-side support tube are formed with screws for connecting the main body-side support tube, and the screw is rotated so that the seat can be lifted and lowered. Since the adjustment is performed by the motor, the height can be easily adjusted, and the seat can be moved up and down while the work is continued.

[Brief description of the drawings]

FIG. 1 is a side view of a work cart employing the invention according to claim 1;

FIG. 2 is a plan view of the same.

FIG. 3 is a side sectional view of the lifting mechanism.

FIG. 4 is a side view of a work cart employing the invention according to claim 2;

FIG. 5 is a plan view of the same.

FIG. 6 is a side sectional view of the lifting mechanism.

FIG. 7 is a plan view of the same.

FIG. 8 is a side view showing another embodiment of the lifting mechanism according to the first aspect of the present invention.

FIG. 9 is a rear view of the same.

FIG. 10 is a side view showing a third embodiment of the lifting mechanism according to the first aspect of the present invention.

FIG. 11 is a front sectional view of the same.

[Explanation of symbols]

 Reference Signs List A Running section B Lifting mechanism C Seat section 13 Seat 50 Seat base 51 Support tube 53 Guide shaft 55 Motor 60 Ball 65 Aircraft side support axis 66 Seat side support axis 67 Screw axis

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Katsuyuki Asakoshi 428 Enami, Okayama-shi In-house (72) Inventor Yasuo Moriyasu 428 Enami, Okayama-shi In-company in-house (72) Inventor Masashi Hachiya 428 Enami, Okayama City

Claims (2)

[Claims] 1. A work vehicle in which a seat is arranged on a traveling portion via an elevating mechanism, a support cylinder having the elevating mechanism erected at least on an upper surface of a body frame, and a guide shaft slidably fitted in the support cylinder. A seat is arranged on the guide shaft, the support tube is formed in a substantially L shape in a side view, a plurality of spherical members are built in a line in the support tube, and an end portion of the support tube is provided. A seat device for a work vehicle, characterized in that a pushing member is disposed on the seat, and the spherical member is pushed and pulled by the pushing member so that the seat can be moved up and down. 2. A work vehicle in which a seat is arranged on a traveling unit via an elevating mechanism, a seat-side support cylinder provided with the elevating mechanism at least on a lower surface of the seat, and an airframe-side support cylinder erecting on an airframe. A screw shaft connecting the seat-side support tube and the body-side support tube, a worm wheel is fixed to the screw shaft, and a worm meshes with the worm wheel;
A seat device for a work vehicle, wherein the worm is linked to a pedal or an electric motor.