JP2000342043A - Device for expanding and contracting handle of mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems that the operating efficiency is deteriorated when performing mowing of a levee having a long slope because the expansion and contraction of a handle cannot be performed in a conventional mower. SOLUTION: This device for expanding and contracting a handle 2 of a mower is obtained by bisecting a handle frame 30 connected to a handle basal part 23, mounting an upper handle frame 52 on a lower handle frame 51 so as to be expandable, contractile and slidable, installing an operating part 3 at the rear of the upper handle frame 52, connecting an operating lever arranged in the operating part 3 through rods to a rotation locking means and a steering means arranged on the side of the handle basal part 23, composing the rods of an upper rod and a lower rod, providing a rod fixed part on the lower side of the upper rod and making the lower rod connectable and releasable at an optional position in the mower equipped with the handle 2 mounted on the handle basal part 23 of the machine body composed of an engine 11, a cutting part and mobile wheels 17 so as to be rotatable in the left and right directions and the vertical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walking type mowing machine for mowing a ridge or an agricultural road, and more particularly to a telescopic mechanism of an operation handle of a mowing machine suitable for mowing an inclined surface.

[0002]

2. Description of the Related Art Conventionally, various types of walking-type mowers have been proposed for mowing a ridge or an agricultural road. For example,
JP-A-10-150824 and JP-A-10-21083
As disclosed in Japanese Patent Application Laid-Open No. 8-108, in a conventional walking-type mower, an engine and a handle are arranged above running wheels, and a handle provided for steering the body is provided in a left-right direction. In addition, only the vertical direction can be adjusted.

[0003]

However, in the prior art, when mowing an inclined surface, the operator must operate the mowing machine while walking on a flat part by positioning the handle in a necessary state. As a result, it is difficult for the worker to perform mowing work in a stable state, which causes a decrease in work efficiency. In order to solve such a problem, the present applicant has proposed a mowing machine in Japanese Patent Application No. 10-316011 in which a handle portion can be freely extended and retracted and fixed at an arbitrary length. There is a need for a reliable mechanism for responding to the expansion and contraction of the handlebars of a connecting mechanism for interlocking the engine rotation adjusting section and the side clutch operating section of the steered wheels with the body body side.

[0004]

The above is the problem to be solved by the present invention. Next, means for solving the problem will be described. That is, in a mowing machine in which a handle is attached to a handle base of a body body composed of an engine, a cutting unit, and running wheels so as to be rotatable left and right and up and down, a handle frame connected to the handle base is divided into two parts. An upper handle frame is attached to the handle frame so as to be extendable and slidable, and an operating portion is provided at a rear portion of the upper handle frame, and an operating lever disposed on the operating portion, and a rotation locking means and a steering means disposed on the handle base side are rods. , The rod is composed of an upper rod and a lower rod, and a rod fixing portion is provided below the upper rod so that the lower rod can be connected and released at an arbitrary position.

[0005] The connecting / disconnecting mechanism of the rod fixing portion is interlocked with a handle telescopic lever.

Further, the rod and the rod fixing portion are provided in a handle frame.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is an overall side view of the mower, FIG. 2 is a plan view of the same, FIG. 3 is a front view of the mowing part, FIG. 4 is a plan view of a handle base that allows the handle to rotate up, down, left and right,
5 is a side sectional view of the same, FIG. 6 is a front view of the same, FIG. 7 is a side sectional view of a handle float fixing portion and a rod fixing portion,
8 is a front cross-sectional view of the rod fixing portion, FIG. 9 is an enlarged side cross-sectional view of the rod fixing portion in a locked state, FIG. 10 is a side cross-sectional view of the unlocked state, FIG. 12 is a plan view of the same, FIG. 13 is a front view of the handle extendable lever, FIG. 14 is a plan view of the operation unit, and FIG.
16 is a side view, FIG. 16 is a plan view showing a state where the cover is also removed, and FIG. 17 is a side sectional view of the same.

First, the overall schematic structure of the mower 1 will be described with reference to FIGS. 1, 2 and 3. The body of the mowing machine 1 has an engine 11 disposed on a transmission case 10, and the transmission case 10 extends to both left and right sides. The cutting blade drive shafts 12 protrude below the left and right halfway portions of the transmission case 10 to fix the cutting blades 13 respectively, and cover the cutting blades 13 above and on the sides with the cutting blade cover 14. It constitutes a reaper.

Further, pipe-shaped axle cases 15 and 15 are formed on both sides of the transmission case 10, and upper portions of the traveling cases 16 and 16 are fixed outside the axle cases 15 and 15, respectively. 16 protrudes rearward and downward. Right and left axles are laterally mounted below the traveling cases 16 and 16 so that power can be transmitted to the axles via a chain or the like.
L · 17R is fixedly provided, and a number of pin-shaped lugs protrude from the wheels 17L / 17R in the radial direction. Thus, the output shaft of the engine 11 is
The cutting blades 13 and the wheels 17L and 17R are driven by being shifted in the transmission case 10 and the cutting blades 13 and 13L and 17R are driven. In the transmission case 10, a side clutch is provided as steering means, By operating side clutch levers 4L and 4R, which will be described later, power is connected and disconnected so that left and right steering can be performed.

[0010] Further, tail wheel locking mechanisms 20 are provided on the front left and right sides of the transmission case 10, and arms 21 are projected forward from the tail wheel locking mechanism 20 so as to be able to turn left and right. A caster type tail wheel 22 is mounted on the front end of the wheel 21. Thus, at the time of work, the arm 21 on which the tail wheel 22 is mounted is turned forward and locked, and at the time of movement, the arm 21 is turned backward to facilitate movement. And the mission case 10
A handle base 23 protrudes rearward from the center of the left and right sides, and the telescopic handle 2 of the present invention is mounted on the handle base 23 so as to be vertically rotatable and left and right.
An operation unit 3 is provided at the rear of the handle 2, and operation levers such as side clutch levers 4 </ b> L and 4 </ b> R, a handle vertical rotation lever 5, and a handle extension lever 6 are arranged on the operation unit 3.

Next, the structure of the handle 2 will be described in detail with reference to FIGS. 4 to 6, the structure of the rotation locking means provided on the handle mounting base will be described. A handle base 31 is fixed on the handle base 23, and the handle base 31 has a flat plate, and approximately half of the flat surface is formed with gear-shaped concave portions 31a, 31a,. They are provided as stoppers 31b. A support pipe 32 serving as a left-right rotation fulcrum axis of the handle 2 is erected on the center of the handle base 31.
A pivot pipe 33 is rotatably fitted outside.

The front portions of the mounting plates 34, 34 are fixedly provided on both sides of the pivot pipe 33, and the mounting plates 34, 3 are provided.
The support shaft 35 is rotatably supported on the vertical rotation support pipe 35 in the horizontal direction at the front end of the support shaft 4, and the handle mounting frames 37, 37 are provided on both sides of the support shaft 36. The front end is fixed.

The mounting plates 34 extend upward and rearward, and a storage pipe 40 is fixedly provided between the rear portions of the mounting plates 34, 34, and a stopper pin 41 is slidably inserted into the storage pipe 40. It is stored. The stopper pin 4
1 has a pointed rear end, and an arc-shaped stopper plate 42 centered on the fulcrum shaft 36 in a side view is fixedly provided between the handle mounting frames 37, 37,
On the stopper plate 42, pin holes 42a
Are opened at predetermined intervals in the vertical direction, and the rear end of the stopper pin 41 is inserted into the pin hole 42a so that the position can be fixed.

A rear end of a slide rod 43 is fixed to the front end shaft portion of the stopper pin 41, and a spring 44 is fitted on the slide rod 43 so that the stopper pin 41 is formed in the pin hole 42a. The sliding rod 43 is urged so as to be inserted thereinto, and nuts 48 are screwed and fixed to the front end of the sliding rod 43, and the upper end of the rotating arm 45 is locked to the rear side of the nut 48. A halfway portion of the rotating arm 45 is pivotally supported by a pivot shaft 46 which extends horizontally between the mounting plates 34, 34. A toggle spring 47 is provided on the boss of the rotating arm 45.
Is externally fitted, and the rotating arm 45 is connected to the stopper pin 4.
1 pushes in the direction of the pin hole 42a.
a is urged to fit into the recess 31a.

The lower end of the rotating arm 45 has a convex portion 4
5a is provided so as to protrude and fit into the recess 31a, and an engagement hole 45b is provided at the lower end of the rotation arm 45 so that one end of the vertical rotation wire 49 can be engaged. . The other end of the vertically rotating wire 49 is connected via a rod or the like to a handle vertically rotating lever 5 provided at a rear portion of the handle 2 described later.

With this construction, by pulling the handle rotation lever 5, the vertical rotation wire 49 is pulled, the upper end of the rotation arm 45 pulls the slide rod 43 forward, and the stopper pin 41 and the pin hole are pulled. 4
2a is disengaged, and the handle 2 can be turned up and down freely.
The engagement of the handle 1a is released, and the handle 2 is rotatable left and right. Then, by returning the handle turning lever 5 to its original position, the convex portion 45a and the concave portion 31a, and the stopper pin 41 and the pin hole 42a are engaged, and the left and right rotation and the vertical rotation of the handle 2 are locked. You do it.

Next, the structure of the frame portion of the handle 2 will be described in detail with reference to FIGS. The handle frame 30 is divided into a lower handle frame 51 and an upper handle frame 52.
The upper handle frame 52 is formed in a pipe shape (a square pipe in this embodiment), and the upper handle frame 52 is configured to be slightly larger than the lower handle frame 51 so that the lower handle frame 51 expands and contracts in the upper handle frame 52. It is freely inserted. A roller or the like is interposed between the two so that expansion and contraction can be performed smoothly. The front end of the lower handle frame 51 is connected to the handle mounting frame 3.
7, and the operation unit 3 is disposed at the rear end of the upper handle frame 52.

As shown in FIG. 7, a handle frame fixing portion 50 is disposed between the lower handle frame 51 and the upper handle frame 52. In this embodiment, a mounting pipe is provided on the lower surface on the front end side of the upper handle frame 52. 53 is vertically provided, and a pressing pin 54 is inserted into the mounting pipe 53 to penetrate the mounting pipe 53 and the upper handle frame 52,
The pressing pin 54 is urged by a spring 55 so as to press against the outer surface of the lower handle frame 51. However,
A configuration in which the tip of the pressing pin 54 is inserted into a pin hole provided at a predetermined interval on the outer periphery of the lower handle frame 51 and locked is also possible.

A locking pin 54a protrudes from the side surface of the pressing pin 54. The locking pin 54a protrudes from a long hole provided in the mounting pipe 53, and is a rotating plate pivotally supported on the side surface of the mounting pipe 53. 56. One end of a handle telescopic wire (or rod) 57 is locked to one end of the rotating plate 56, and the other end of the handle telescopic wire 57 is connected to a handle telescopic lever 6 provided on the operation unit 3 in an interlocked manner.

A rod fixing part 60 is provided in the lower handle frame 51. That is, the lower handle frame 51 has left and right side clutch lower rods 61L.
The side clutch lower rod 61 accommodates the lower rod 62 and the lower rod 63 of the accelerator.
As shown in FIGS. 4 and 5, the front ends of the L.61R, the handle vertical rotation lower rod 62 and the accelerator lower rod 63 are connected to the side clutch wires 64L and 64R, the handle vertical rotation wire 49, and the accelerator wire 65, respectively. Each of the lower rods is slightly shorter than the lower handle frame 51 by being urged by the springs 66, 66.

A rod fixing portion 60 is provided so as to be slidable on the left and right side clutch lower rods 61L and 61R, the handle vertically turning lower rod 62, and the accelerator lower rod 63. As shown in FIGS. 8 and 9, the same operation is performed on each of the rods, and therefore, the fixing portion provided on the lower rod 62 for vertically turning the handle will be described. The handle vertically rotating lower rod 62 is inserted into sliding holes 67a, 67a opened on the upper and lower surfaces of a guide plate 67 formed in a U-shape in side view, and a locking hole 67b is formed in the side surface of the guide plate 67. Is open.

On the other hand, the regulating plate 6 formed in a substantially L-shape
A restricting hole 69a is opened at the center of the horizontal portion 9 and a locking convex portion 69b is provided at one end of the horizontal portion of the restricting plate 69, and the vertical portion extends downward on the center side of the lower handle frame 51. Then, the horizontal portion of the regulating plate 69 is inserted between the upper and lower plates of the U-shaped portion of the guide plate 67,
The lower handle 62 is inserted into the regulating hole 69a, and the locking projection 69b is inserted into the locking hole 67b and locked.
Further, a spring 70 is externally fitted between the regulating plate 69 and the guide plate 67 on the handle vertically rotating lower rod 62 to urge the regulating plate 69 to lift. This urging force causes the regulating plate 69 to incline, thereby restricting the regulating hole 6.
When the rod 9a and the handle vertically rotating lower rod 62 are squeezed (caught), the handle vertically rotating lower rod 62 and the guide plate 67 are locked.

One end of an upper rod 72 for turning the handle vertically is fixed to the guide plate 67, and upper rods 71L and 71R and upper rod 73 for the accelerator are fixed to the other guide plates 67, 67 and 67, respectively. The fixing position of the fixing portion can be finely adjusted by lock nuts 74. The side clutch upper rods 71L and 71R, and the handle vertical rotation upper rod 7
2. The other end of the accelerator upper rod 73 extends to the rear of the upper handle frame 52 and is connected to the side clutch levers 4L and 4R, the handle vertical rotation lever 5, and the accelerator grip 7, respectively. 68 is a partition plate.

A release rod 75 is disposed at the center of the lower handle frame 51 and the upper handle frame 52, and a contact plate 76 is fixed to the front end of the release rod 75. The contact plate 7 is connected to the lever 6 and pulled by the release rod 75.
6 is provided so as to contact the lower end of the regulating plate 69. That is, when the contact plate 76 contacts the lower end of the regulating plate 69, as shown in FIG. 10, the regulating plate 69 rotates about the locking hole 67b, and the regulating hole 69a of the regulating plate 69 And the lock is released, and the rod fixing portion 60 becomes slidable on each lower rod. Therefore, the upper handle frame 52 and the side clutch upper rods 71L and 71R, the accelerator upper rod 73 and the guide plates 67, 67. Conversely, when the handle extendable lever 6 is returned to the locked state, a squeeze occurs between the regulating hole 69a and each lower rod, and the sliding becomes impossible.

As shown in FIG. 11, the other end of the release rod 75, that is, the rear end, is fixed to a mounting stay 77, and the mounting stay 77 is fixed to an arm pin 79. The arm pin 79 is connected to an upper handle frame. A mounting stay 80 is fixed to a lower portion of the arm pin 79, and the mounting stay 80 is formed in an L shape in a side view, and the handle is extended and retracted at a front end of the mounting stay 80. Insert the screw rod part 57a at the rear end of the wire 57,
The position of contact with the mounting stay 80 can be adjusted by the nuts 59, and the handle extendable lever 6 is pivotally supported so as to be rotatable left and right.

The handle extension lever 6 is shown in FIGS.
As shown in the figure, at the front position of the operation unit 3, it is configured in an inverted Ω shape when viewed from the front. With this configuration, even if the left and right grips 6a are gripped and pulled, the handle extendable lever 6 only rotates about the arm pin 79, and cannot be unlocked. Cannot be stretched. However, the left and right grips 6a
6a, the arm pin 79 is pulled rearward, and the release rod 75 is pulled.
The lock is released as shown in FIG. 0, and thereafter, the handle frame fixing portion 50 is released by pulling the handle extension wire 57, and the handle frame 30 can be extended and contracted to adjust the length.

Next, the configuration of the operation unit 3 will be described. 14 to 17, the upper handle frame 52
The left and right front portions of the pipe handle 81 formed in a substantially elliptical shape are fixed to the rear end, and the bases of the side clutch levers 4L and 4R are pivotally supported by the pipe handle 81, and the grips of the side clutch levers 4L and 4R are provided. The part is arranged inside the pipe handle 81. Each of the side clutch levers 4L and 4R has a side clutch upper rod 71L.
71R is connected to the side clutch upper rod 71L.
· Lock pin 71La · 71Ra at the rear of 71R
Are fixed in the left-right direction.

Attachment stays 82 project downward from the rear lower portion of the upper handle frame 52. A support shaft 83 is pivotally supported by the attachment stays 82 and the handle is vertically rotated by the support shaft 83. The base of the lever 5 is fixed,
It protrudes upward from between the left and right side clutch upper rods 71L and 71R. The handle vertical rotation lever 5 includes a base lever 5a formed in an L shape in a side view, and a pipe-shaped upper lever 5b fitted to the upper portion of the base lever 5a so as to be vertically slidable. The upper lever 5b
The base lever 5a can be held at an upwardly raised position and at a downwardly lowered position by a holding mechanism (not shown) with respect to the base lever 5a.

The upper end of the upper lever 5b is a grip 5c, and the upper surface of the upper lever 5b can be engaged with a locking pin 72a fixed to the rear end of the upper rod 72 by the handle. The provided engagement plate 84 is fixed. A locking claw 85 formed in an L-shape when viewed from the side is projected from a lower rear surface of the upper lever 5b, and the locking claw 85 is arranged so as to be able to engage with the locking pins 71La and 71Ra.

With this configuration, when the handle vertical rotation lever 5 is rotated backward, the engagement plate 84 is engaged with the locking pin 72a, and the handle vertical rotation upper rod 72, the handle vertical rotation The lower rod 62 is pulled, and further, the stopper pin 41 is pulled via the vertically rotating wire 49 to release the engagement with the stopper plate 42 so that the handle 2 can be vertically rotated. Is disengaged from the recess 31a and can be rotated left and right.

When the side clutch lever 4L (or 4R) is gripped and turned to turn left and right, the side clutch wire 64L is passed through the side clutch upper rod 71L (or 71R) and the side clutch lower rod 61L (61R). (64R) and pull the wheel 17L (1
7R), and turn. At the same time, the locking pins 71La and 71Ra provided on the side clutch upper rod 71L (or 71R) are engaged with the locking claws 85 to rotate the handle vertical rotation lever 5 rearward, thereby moving the handle 2 It can be turned up and down. Further, when it is not necessary to turn the handle 2 up and down and left and right at the time of this turning, the upper lever 5b is pushed downward to engage the locking pin 71L.
a · 71Ra can be prevented from engaging with the locking claw 85.

An accelerator grip 7 is provided at the rear horizontal portion of the pipe handle 81, and is connected to the accelerator upper rod 73 via a wire or the like, and the accelerator grip 7 is rotated by rotating the accelerator grip 7. ,
The throttle of the engine 11 is connected to the throttle of the engine 11 through the upper accelerator rod 73, the lower accelerator rod 63, and the accelerator wire 65, so that the rotation speed of the engine 11 can be changed. The rear of the upper handle frame 52 and the operation section 3 at the left and right central portions of the pipe handle 81 are covered with a cover 86, and an engine stop switch 87 is provided on the rear of the cover 86.

In the above configuration, when mowing work is performed, the engine 11 is started, the handle fixing levers 6L and 6R are gripped to unlock the rod fixing portion 60, and the length of the handle frame 30 is reduced. Then, release the handle from the handle extendable levers 6L and 6R to lock the rod fixing portion 60. And the handle vertical rotation lever 5
To adjust the vertical height of the handle 2 and the left and right rotation angles. When the accelerator grip 7 is rotated to increase the engine speed, the cutting blade 13 and the wheels 17L
17R is driven and mowing work can be performed.

[0034]

As described above, the present invention has the following advantages. That is, in a mowing machine in which a handle is attached to a handle base of a body body composed of an engine, a cutting unit, and running wheels so as to be rotatable left and right and up and down, a handle frame connected to the handle base is divided into two parts. An upper handle frame is attached to the handle frame so as to be extendable and slidable, and an operating portion is provided at a rear portion of the upper handle frame, and an operating lever disposed on the operating portion, and a rotation locking means and a steering means disposed on the handle base side are rods. The rod is composed of an upper rod and a lower rod, and a rod fixing portion is provided below the upper rod so that the lower rod can be connected and released at an arbitrary position. In addition to being able to adjust the vertical and horizontal angles of the handle according to the body of the person, the length of the handle can also be adjusted, making it possible to harvest in a reasonable posture Ri, it is possible to improve the work efficiency. Then, since the rods can be connected even after the expansion / contraction operation, operations such as vertical rotation, left / right rotation, and steering can be performed. Further, since the operating lever and the locking means are connected by the rod, the rigidity of the operation transmitting mechanism is increased, and the operation feeling can be improved.

Further, since the connecting / disconnecting mechanism of the rod fixing portion is connected to the handle extendable lever in an interlocking manner, only the handle extendable lever is operated to extend and retract the handle. The length can also be adjusted, the extension and retraction of the handle can be performed quickly and easily, and the length of the handle can be changed immediately according to the progress of the mowing operation.

Further, since the rod and the rod fixing portion are provided in the handle frame, it is possible to prevent entanglement with surrounding parts caused when the wire system is employed, and also prevent entanglement of the cut grass with the rod. As a result, the appearance of the handle frame can be improved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a mower.

FIG. 2 is a plan view of the mower.

FIG. 3 is a front view of the reaper.

FIG. 4 is a plan view of a handle base that allows the handle to rotate vertically and horizontally.

FIG. 5 is a side sectional view of the same.

FIG. 6 is a front view of the same.

FIG. 7 is a side sectional view of a handle float fixing part and a rod fixing part.

FIG. 8 is a front sectional view of a rod fixing portion.

FIG. 9 is an enlarged side sectional view of a locked state of the rod fixing portion.

FIG. 10 is a side sectional view of the unlocked state.

FIG. 11 is a side sectional view of a handle telescopic lever mounting portion.

FIG. 12 is a plan view of the same.

FIG. 13 is a front view of the handle extendable lever.

FIG. 14 is a plan view of an operation unit.

FIG. 15 is a side view of the same.

FIG. 16 is a plan view showing a state where a cover is removed.

FIG. 17 is a side sectional view of the same.

[Explanation of symbols]

 2 Handle 3 Operating part 4 Side clutch lever 5 Handle vertical rotation lever 6 Handle extension lever 11 Engine 17 Wheel 23 Handle base 30 Handle frame 51 Lower handle frame 52 Upper handle frame 60 Rod fixing part 61L / 61R Side clutch lower rod 62 Handle Vertically rotating lower rod 63 Accelerator lower rod 71L / 71R Side clutch upper rod 72 Handle vertically rotating upper rod 73 Accelerator upper rod 75 Release rod

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Motoharu Hozaki 197 Kume, Okayama City, Okayama Prefecture Inside the Okayama Plant of Ishikawajima Shibaura Machinery Co., Ltd. (72) Inventor Yasuhiro Harada 197 Kume, Okayama City, Okayama Prefecture Ishikawajima Shibaura Machinery Co., Ltd. F term in Okayama factory (reference) 2B083 AA02 BA03 CA28 DA02 GA04 HA22 HA24 HA26 HA32 HA59

Claims (3)

[Claims] 1. A mowing machine in which a handle is attached to a handle base of an airframe main body composed of an engine, a cutting section, and running wheels so as to be rotatable left and right and up and down, a handle frame connected to the handle base is divided into two parts. The upper handle frame is attached to the lower handle frame so as to be extendable and slidable, and an operation section is provided at a rear portion of the upper handle frame. An operation lever disposed on the operation section, a rotation lock means disposed on the handle base side, and a steering mechanism The means are connected via a rod, the rod is composed of an upper rod and a lower rod, and a rod fixing portion is provided below the upper rod so that the lower rod can be connected and released at an arbitrary position. And mower handle extension device. 2. A connecting / disconnecting mechanism for the rod fixing part,
The handle extender of a mower according to claim 1, wherein the handle extender is interlocked with the handle extender. 3. The handle extender for a mowing machine according to claim 1, wherein the rod and the rod fixing portion are provided in a handle frame.