JP4989616B2 - Self-propelled mower - Google Patents

Description

The present invention relates to a self-propelled mower, and more particularly, either forward and backward, related to the same as those to be efficiently mowing.

Conventional self-propelled mowers ( hereinafter sometimes simply referred to as “mowers”) can only mow in the forward direction. In other words, in order to change the direction of travel of the mower, it was necessary to lift (or push down) the handle and turn the mower body in an inclined state to change the direction of the mower itself. However, in sloped areas such as river dike slopes, the scaffolding is worse than flat surfaces, and it is dangerous to change the direction of travel of the mower.

For this reason, when the grass of inclined surfaces, such as the slope of a dike, is cut with the conventional mower, the method as shown next was taken (refer FIG. 15).
(1) Face the front with respect to the direction of travel of the mower A, and first mow the grass from the left end to the right end of the inclined surface, for example.
(2) Once the grass has been cut to the end of the inclined surface, the mower A is once moved to a flat surface with a good scaffold above (or below) the inclined surface. Next, the handle 9 is lifted (or pushed down) to turn the mower A main body 180 degrees to change the traveling direction of the mower A. Then, the mower A is returned to the inclined surface again.
(3) Mow the grass up to the left end of the inclined surface in the state of facing the front direction with respect to the traveling direction of the mower A as in (1).
(4) The above steps (1) to (3) are repeated to move down the inclined surface and mow the grass on the entire inclined surface.

However, the conventional apparatus as described above has the following problems.
In other words, when cutting grass with a slope such as a river bank slope using a conventional mower, it was necessary to move the mower once to a flat surface with good footing. The mowing machine had to be moved up and down many times and the work efficiency was poor.

Therefore, as a result of diligent research to reduce the labor and labor required for mowing, the present inventors are capable of both forward and reverse travel, and mowing is equally efficient in either direction. We have developed a self-propelled mower that can be used to complete the present invention.
Moreover, in developing the above-mentioned self-propelled mower, in addition to operations such as the speed of the mower and the speed change of the speed change means, an operation for switching the advancing direction (forward and reverse) is added. As a result of working on the development of an operating lever device that can be easily operated with the operating lever and carrying out extensive research, the present invention has been completed.
Furthermore, in developing the mower described above, the direction of the handle can be adjusted easily and quickly because the necessity of frequently adjusting the direction of the handle has arisen with the change of the direction of travel (forward and reverse). As a result of working on the development of this adjustment device and carrying out extensive research, the present invention was completed.

(Object of invention)
Accordingly, a first object of the present invention is to provide a self-propelled mower capable of cutting grass efficiently in both forward and reverse directions in order to reduce labor and labor required for mowing. is there.

The second object of the present invention is to eliminate the need for the movement to the flat surface for each turn-back position to change the orientation of the mower body, so that the labor required for mowing work can be reduced and work efficiency can be improved. It is to provide the self-propelled mower to.

  A third object of the present invention is to provide a self-propelled grass mower that can easily and quickly perform operations such as switching between forward and reverse travel directions, shifting gears, and traveling speed in a self-propelled grass mower. It is to provide an operation lever device for a working machine such as the above.

A fourth object of the present invention is to provide a steering wheel direction adjusting device which can easily and quickly adjust the steering wheel direction of a working machine such as a mower or a cultivator.
Other objects of the present invention will become apparent from the following description.

The means of the present invention taken to achieve the above object are as follows.
In the first invention,
A traveling means for enabling the forward and backward by the power of the prime mover, there in worker self-propelled mowing machine to allow mowing inclined surface located on the side to the traveling direction of the mower And
A cutter that rotates horizontally,
A handle that can be set on the side of the grass cutter in the direction of movement and set the direction to the operator side who is mowing the inclined surface,
With
The handle is
An adjustment device that is provided on a base member that can be rotated in the horizontal direction so as to be able to rotate in the vertical direction and includes a horizontal direction adjusting means that can be adjusted in the horizontal direction and a vertical direction adjusting means that can be adjusted in the vertical direction It is configured so that the direction can be adjusted by
The travel means is
A pair of rear wheels and a pair of front wheels, the power of the prime mover is transmitted to the four wheels of the rear wheel and the front wheel via a chain;
The configuration is
A chain case on the rear wheel side,
A chain case on the front wheel side,
A chain case disposed between the chain case on the rear wheel side and the chain case on the front wheel side;
Have
The chain case on the rear wheel side
A sprocket provided on the axle of the rear wheel;
A sprocket provided on a rear drive shaft for driving the rear wheel;
A chain wound between these sprockets,
Is housed,
The chain case on the front wheel side
A sprocket provided on the axle of the front wheel;
A sprocket provided on the front drive shaft;
A chain wound between these sprockets,
Is housed,
In the chain case disposed between the chain case on the rear wheel side and the chain case on the front wheel side,
A sprocket provided on the rear drive shaft and different from the sprocket provided on the rear drive shaft;
A sprocket provided on the front drive shaft and different from the sprocket provided on the front drive shaft;
A chain wound between these sprockets,
Is housed,
It is a self-propelled mower.

In the second invention,
The horizontal direction adjusting means includes means for locking the horizontal rotation of the base member, and the vertical direction adjusting means includes a locking member provided with means for locking the vertical rotation of the handle.
A self-propelled mower according to the first invention.

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In the third invention,
The handle is formed to be stretchable,
A self-propelled mower according to the first or second invention.

In the fourth invention,
An operating lever device for a work machine including a speed change means for changing the speed of the travel means;
Traveling direction switching means for switching the traveling direction of the traveling means;
A shift switching means for shifting the speed change means;
Output control means for controlling the output of the prime mover;
Contains
The control of the traveling direction switching means, the shift switching means, and the output control means can be operated with the same operation lever.
A self-propelled mower according to any one of the first to third aspects .

In the fifth invention,
The cutting height adjusting means is provided, and the cutting height adjusting means is configured to be operated on the handle side of the handle .
A self-propelled mower according to any one of the first to fourth aspects .

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Self-propelled mowing machine according to the present invention includes a traveling means advanceable and reverse travel includes a cutter, either before proceeding with the reverse of, just as efficiently can mowing, effort and labor required for mowing Can be reduced.

In the case of a self-propelled mower including a handle that can be set in the required direction with respect to the traveling direction of the traveling means, for example, when used in an inclined place such as a river bank slope, Can be mowing. In addition, as a method of mowing grass, a method of mowing grass from one end side to the other end side in the lateral direction of the inclined surface in order from the top will be described as an example.
(1) First, set the direction of the handle upward at a substantially right angle with respect to the direction of travel of the mower (substantially perpendicular to the tilt direction), and then cut the mower while standing sideways with respect to the direction of travel of the mower. Be able to.
(2) The worker advances the mower while walking in the horizontal direction, and first mows the grass from the left end to the right end of the inclined surface.
(3) When the grass has been cut to the right end of the inclined surface, the traveling direction of the traveling means is switched without changing the direction of the handle. Then, in order to mow the grass one step below, after the mower is slightly advanced in the diagonally downward direction, the grass from the right end to the left end of the inclined surface is similarly mowed.
(4) When the grass has been cut to the left end of the inclined surface, the traveling direction of the traveling means is switched without changing the direction of the handle, as in the operation of (3). Then, every time the grass under one step is cut, the grass cutter is moved slightly diagonally downward, and then the grass is similarly cut from the left end to the right end of the inclined surface.
(5) Repeat the above operations (3) and (4) to move down the inclined surface and mow the grass on the entire inclined surface.
If the grass is mowed as described above, the operation of changing the direction of the mower by moving to a flat ground at each turn-back point as in the prior art becomes unnecessary. Therefore, labor required for mowing can be reduced and work efficiency can be improved.

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Has a cutting height adjustment hand stage capable of adjusting the cutting height, there the self-propelled mower cutting height adjusting means is adapted to adjust the height cutting by changing the height of the traveling means For example, the cutting height of the cutter can be adjusted to an appropriate height according to the length of the grass and the undulations of the ground.

  In a self-propelled grass mower capable of operating the cutting height adjusting means on the handle side, the cutting height adjusting means can be operated while holding the handle. Even with an unstable inclined surface, the cutting height can be adjusted quickly and safely.

  In the case of a self-propelled mower that tilts in the same way as the front side of the traveling direction of the self-propelled mower is inclined downward, the cutter is a rotary blade that rotates horizontally. Since the stump, which is the rest of the grass that has been cut on the part side, can be prevented from hitting again on the rear side of the cutter, the resistance applied to the cutter can be reduced and the grass can be cut efficiently, and the cutter drive system including the prime mover is applied. It is possible to reduce the burden and improve durability and fuel consumption.

  In a self-propelled mower with a handle that can be extended and retracted, the distance between the mower body and the operator can be adjusted, so avoid obstacles such as uneven surfaces and stones. You can work while securing a good footing. Also, grass that grows in places where workers cannot enter directly, such as under a tree, can be cut from a remote position by extending the handle.

  In the operation lever device according to the present invention, (1) switching between the forward and reverse traveling directions, (2) shifting of the transmission means, and (3) traveling speed associated with engine output control, etc. Since it can be operated with a lever, each operation can be performed easily and quickly. As a result, the operability and workability of a working machine such as a mower and a cultivator can be improved.

  In the adjusting device for adjusting the direction of the handle according to the present invention, the vertical direction adjusting means and the horizontal direction adjusting means of the handle can be operated by the same operating means. The handle can be easily and quickly adjusted as compared with the case of adjusting with the operating means. Further, the handle can be set in the most suitable direction for work by a combination of the vertical direction and the horizontal direction.

  In a handle direction adjusting device including a locking member having means for locking horizontal rotation of a base member provided with a handle and means for locking vertical rotation of the handle. For example, only by operating the locking member with an operation wire or the like, the direction of the handle provided on the base member can be adjusted by inclining in the vertical direction, and can be adjusted by rotating in the horizontal direction. . Therefore, the adjustment of the handle can be performed easily and quickly as compared with the case where the adjustment in the vertical direction and the horizontal direction is adjusted by different operation means.

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The present invention has the above-described configuration and has the following effects.
(A) self-propelled mowing machine according to the present invention includes a traveling means advanceable and reverse travel, Ri Contact comprise cutters, both before proceeding with the reverse of efficiently can mowing Similarly, mowing Can reduce the labor and labor required.

(B) In a self-propelled mower including a handle that can be set in a required direction with respect to the traveling direction of the traveling means, the direction of the handle is set to, for example, the traveling direction of the mower (substantially perpendicular to the inclination direction). ) Can be set at a substantially right angle to the upper side, so that mowing can be performed while standing next to the traveling direction of the mower.
Therefore, for example, when used in an inclined place such as a river dike slope, if the grass mowing is performed while switching the direction of travel of the mower while standing sideways, the conventional folded part Therefore, it is unnecessary to move to a flat ground and change the direction of the mower. Therefore, labor required for mowing can be reduced and work efficiency can be improved.

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Has a cutting height adjustment hand stage can be adjusted (e) cutting height, self-propelled mowing adapted to adjust the height cutting by changing the row height means run is cutting height adjusting means In the machine, the cutting height of the cutter can be adjusted to an appropriate height according to the length of the grass and the undulations of the ground.

(F) In the self-propelled grass mower capable of operating the cutting height adjusting means on the hand side of the handle, the cutting height adjusting means can be operated while holding the handle. For example, even on an inclined surface where the feet are unstable, the cutting height can be adjusted quickly and safely.

(G) In a self-propelled mower that tilts in the same way as the front side of the traveling direction of the self-propelled mower is inclined downward, the cutter is a rotary blade that rotates horizontally. Since the stump, which is the rest of the grass that has been cut on the front side of the cutter, can be prevented from hitting again on the rear side of the cutter, the resistance applied to the cutter can be reduced and the grass can be efficiently cut, and the cutter drive including the prime mover The burden on the system can be reduced and the durability and fuel consumption can be improved.

(H) In a self-propelled mower with a handle that can be extended and retracted, the distance between the mower body and the operator can be adjusted, so avoid obstacles such as uneven surfaces and stones. Therefore, it is possible to work while always securing a place with good footing. Also, grass that grows in places where workers cannot enter directly, such as under a tree, can be cut from a remote position by extending the handle.

(I) In the operating lever device according to the present invention, (1) switching between forward and reverse traveling directions, (2) shifting of the shifting means, and (3) traveling speed associated with engine output control, etc. Since the operation can be performed with the same operation lever, each operation can be performed easily and quickly. As a result, the operability and workability of a working machine such as a mower and a cultivator can be improved.

(J) In the adjusting device for adjusting the direction of the handle according to the present invention, the vertical adjusting means and the horizontal adjusting means of the handle can be operated by the same operating means. The handle can be adjusted easily and quickly as compared with the case of adjusting the position with different operating means. Further, the handle can be set in the most suitable direction for work by a combination of the vertical direction and the horizontal direction.

(K) A steering direction adjusting device including a locking member having means for locking horizontal rotation of a base member provided with a handle and means for locking vertical rotation of the handle. In this case, for example, only by operating the locking member with an operation wire or the like, the direction of the handle provided on the base member can be adjusted by inclining in the vertical direction and adjusted by rotating in the horizontal direction. be able to. Therefore, the adjustment of the handle can be performed easily and quickly as compared with the case where the adjustment in the vertical direction and the horizontal direction is adjusted by different operation means.

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It will be described in more detail Hazuki based on the present invention with reference to the drawings.
[ Reference Example 1]
FIG. 1 is a schematic side view showing Reference Example 1 of a self-propelled mower according to the present invention,
2 is a schematic front view of the self-propelled mower shown in FIG.
FIG. 3 is a schematic explanatory view of the self-propelled mower shown in FIG.
FIG. 4 is an explanatory view showing a cross section showing the internal structure of the clutch box and the transmission case provided in the rear part of the prime mover in FIG.
FIG. 5 is a schematic explanatory view showing a cover attachment structure attached to the front and rear parts of the self-propelled mower.
FIG. 6 is a schematic perspective view showing the front side of the self-propelled mower,
FIG. 7 is a schematic perspective view showing the rear side of the self-propelled mower,
FIG. 8 is a schematic explanatory view showing the operation of the cutting height adjusting device, in which FIG. 8 (a) shows the maximum cutting height state, FIG. 8 (b) shows the minimum cutting height state in the forward direction, and FIG. (C) shows the minimum cutting height state in the reverse direction.
Note that the self-propelled mower B shown in FIGS. 2 and 3 represents the cover with a two-dot chain line, and the mission case is omitted in FIG.

Symbol B is a self-propelled mower that can travel both forward and backward, and can mow in either direction.
The mower B has a frame 1 formed of a metal plate. As shown in FIG. 3, the frame 1 is formed such that the central portions on both the left and right sides protrude slightly from the traveling direction, and even when a cutter 2 described later blows away foreign matters such as stones, It has a structure that is difficult to scatter.

Front and rear portions of the frame 1 are provided with a front wheel 31 that constitutes traveling means and a rear wheel 41 that is a driving wheel. A protruding spike portion 410 is provided on the tread portion of the rear wheel 41.
Further, a mission case 42 that also constitutes a traveling means is provided at the rear upper part of the frame 1, and in this mission case 42, a rear drive shaft 43 (see FIG. 3) for driving the rear wheels 41, and will be described later. A shift selection shaft 44 and a shift gear (not shown) are provided. As shown in FIG. 1, sprockets 45 and 46 are provided on the rear axle 411 and the rear drive shaft 43 of the rear wheel 41, and a chain 47 is wound between the sprockets 45 and 46. Note that the sprockets 45 and 46 and the chain 47 are accommodated in a chain case 48.

  A motor 51 is provided on the upper portion of the frame 1. The prime mover 51 drives the rear wheel 41 and the cutter 2 described above. A fuel tank 52 is provided below the prime mover 51.

  At the lower part of the frame 1, as shown in FIG. 3, cutters 2 constituting mowing means are arranged side by side with respect to the traveling direction. The cutter 2 has a blade plate 21 and is a rotary blade that can rotate horizontally. The blade plate 21 is horizontally attached to the vertical shaft 22. A driven pulley 23 that receives power from the prime mover 51 is attached to the upper end portion of the vertical shaft 22 of the cutter 2 that is located on the right side when viewed from the front side in FIG.

Further, as shown in FIG. 2, a drive gear 24 is provided on the vertical shaft 22 of the cutter 2 to which the driven pulley 23 is attached. Further, a driven gear 24a is provided on the vertical shaft 22 of the cutter 2 located on the left side in FIG. In addition, a transmission gear 25 is provided between the drive gear 24 and the driven gear 24a so as to mesh with each other. As a result, the cutters 2 arranged side by side receive power from the prime mover 51 and rotate simultaneously in opposite directions.
That is, the rotation direction of the cutters 2 arranged side by side is the inner side with respect to the traveling direction, and the grass can be efficiently cut so as to always hold the grass between the cutters 2.

  In FIG. 4, the power of the prime mover 51 is transmitted from the drive shaft 531 in the clutch box 53 provided at the rear of the prime mover 51 to the vertical shaft 532. A driving pulley 54 for driving the cutter 2 is attached to the lower end portion of the vertical shaft 532. A belt 55 is wound around the drive pulley 54 and the driven pulley 23 (see FIG. 3) that rotates the cutter 2, so that power from the vertical shaft 532 can be transmitted to the cutter 2.

  Further, the vertical shaft 532 is linked to the shift selection shaft 44 via a bevel gear 533, and the shift selection shaft 44 is linked to the rear drive shaft 43 via a shift gear (not shown). As a result, power from the vertical shaft 532 is transmitted to the rear drive shaft 43 to drive the rear wheel 41.

  Further, the drive shaft 531 controls the rotation of the vertical shaft 532 in the forward rotation direction and the reverse rotation direction by a pawl clutch 534 fitted in the drive shaft 531. The pawl clutch 534 is movable in the axial direction of the drive shaft 531 and is fixed in the axial direction of the drive shaft 531.

Each of the forward rotation bevel gear 535 and the reverse rotation bevel gear 536 provided facing each other in the axial direction of the drive shaft 531 and the bevel gear 537 provided at the upper end portion of the vertical shaft 532 are always meshed with each other. 535 and 536 are idling on the drive shaft 531. Then, the pawl clutch 534 is moved to the left or right to be coupled to the forward rotation bevel gear 535 or the reverse rotation bevel gear 536, and the power of the drive shaft 531 is transmitted to the vertical shaft 532.
When the pawl clutch 534 is coupled with the forward rotation bevel gear 535, the rotation of the vertical shaft 532 is in the forward rotation direction, and when the pawl clutch 534 is coupled with the reverse rotation bevel gear 536, the rotation of the vertical shaft 532 is in the reverse rotation direction. Become.

  Thus, when the vertical shaft 532 rotates in the forward direction, the rear axle 411 and the cutter 2 rotate in the same manner, the rear axle 411 rotates in the forward direction, and the cutter 2 rotates inward with respect to the forward direction. It becomes like this. On the other hand, when the rotation of the vertical shaft 532 is switched in the reverse rotation direction, the rear axle 411 and the cutter 2 rotate in the same reverse direction, the rear axle 411 rotates in the backward movement direction, and the cutter 2 moves inward with respect to the backward movement direction. Rotate in the direction.

  As described above, since the rotation direction of the cutter 2 is appropriately switched to the inner direction according to the traveling direction of the mower B, it is possible to efficiently cut the grass so as to always hold the grass between the cutters 2 arranged side by side. In addition, by rotating the cutter 2 inward with respect to the traveling direction, the cut grass can be left cleanly in the vicinity of the center of the cutting width without scattering the outside, and scattering of foreign matters such as stones Can also be reduced.

  A handle 6 is provided above the clutch box 53. The handle 6 can be adjusted by rotating the direction of the handle 6 in the horizontal direction with respect to the traveling direction of the mower B, and can also be adjusted by tilting in the vertical direction. Further, the handle 6 can be adjusted in length stepwise by a telescoping method. Reference numeral 61 denotes an adjustment pin for adjusting the length of the handle 6.

  Reference numeral 62 denotes a switching lever for changing the traveling direction of the mower B, and the traveling direction can be switched with one touch while holding the handle 6. Reference numeral 63 denotes a lever case having a display function for displaying the traveling direction. Reference numeral 66 denotes a travel clutch that controls the power from the prime mover 51 to the drive wheel, and reference numeral 67 denotes a knife clutch that controls the power from the prime mover 51 to the cutter 2. Further, although not shown, the handle 6 is also provided with a mission lever linked to a transmission gear (not shown). Thereby, the traveling speed of the mower B can be switched with one touch while holding the handle 6.

  A cover 71 for guiding the grass to the cutter 2 as shown in FIG. The cover 71 has a rubber cover body 710 and a metal attachment plate 711 for attaching the cover body 710 to the frame 1. Note that the cover 71 can be entirely formed of a metal plate.

The mounting plate 711 is rotatably mounted on the lower side of the frame 1 by the mounting bracket 72, the mounting shaft 73, and the nut 74, and can be inclined inward so that the lower side of the cover 71 approaches the cutter 2 side. . Accordingly, the grass can be guided to the cutter 2 in a state in which the root is raised to some extent without completely pushing down the grass from the root.
Therefore, the grass can be mowed reliably, and uncut grass is prevented. This cover structure is particularly suitable when mowing long grass that tends to fall.

Further, since the outer surface portion 712 side of the mounting plate 711 is in contact with the inner surface of the wall surface portion 11 of the frame 1, the cover 71 is prevented from opening outward from a predetermined inclined position.
Thereby, since the cover 71 does not open outward on the rear side in the traveling direction, an opening is not substantially formed. Further, on the front side in the traveling direction, the cover 71 opens inward, but is substantially covered with grass, so that an opening is not substantially formed.
Therefore, since no opening is formed in the front-rear direction of the cutter 2 during traveling, even when the cutter 2 bounces off foreign matters such as stones, it can be prevented from being scattered outside the cover 71, which is excellent in safety.

Furthermore, the mower B has a cutting height adjusting device 8 that adjusts the cutting height of the cutter 2 by changing the height of the front wheel 31 or the rear wheel 41.
The cutting height adjusting device 8 will be described with reference to FIGS. 1, 6, and 7.
Main components of the cutting height adjusting device 8 are provided on the right side with respect to the forward direction of the mower B. The cutting height adjusting device 8 includes a front wheel height adjusting member 81a that adjusts the height of the front wheel 31, a rear wheel height adjusting member 81b that adjusts the height of the rear wheel 41, a front wheel height adjusting member 81a, and a rear wheel height adjusting member. The operation lever 83 which connects 81b and operates the height of each wheel 31 and 41 is provided. A base end portion of the operation lever 83 is rotatably attached to a lever attachment portion 831 provided on the frame 1.

  The front wheel height adjusting member 81a is formed so that the central portion is arcuate, and the tip side and the base side are formed to protrude outward. As shown in FIG. 6, the base end portion of the front wheel height adjusting member 81 a is fixed to the front end portion of the front leg member 85 attached to the front axle 311. Further, the fixed portion of the front wheel height adjusting member 81 a and the front leg member 85 is rotatably attached by a shaft portion 861 of a bearing portion 86 provided on the frame 1. Further, a bearing portion 86 having a front leg member 85 and a shaft portion 861 is also provided on the front wheel 31 side opposite to the frame 1.

  And the front leg members 85 and 85 provided across the frame 1 are connected to each other by a connecting shaft 87a provided across the frame 1 from side to side. Accordingly, the front wheels 31 and 31 make the same movement with respect to the frame 1 when adjusting the cutting height by operating the operation lever 83.

Further, the rear wheel height adjusting member 81b has a configuration in which the front wheel height adjusting member 81a is mounted in line symmetry with the operation lever 83 as the center.
That is, the central portion is formed to have an arc shape, and the distal end side and the base portion side are formed to protrude outward. The base end portion of the rear wheel height adjusting member 81b is fixed to the inside of the chain case 48 as shown in FIG. However, it is not fixed to the rear drive shaft 43, but the rear drive shaft 43 is idled with respect to the rear wheel height adjusting member 81b.
The chain cases 48 provided across the frame 1 are connected to each other by a connecting shaft 87b provided across the frame 1 from side to side. Thus, the rear wheels 41 and 41 make the same movement with respect to the frame 1 when adjusting the cutting height by operating the operation lever 83.

  Further, a groove 810a is provided from the front end side of the front wheel height adjusting member 81a to the base end portion of the arc-shaped portion. Similarly, in the rear wheel height adjusting member 81b, a groove portion 810b is provided from the distal end side to the base end portion of the arc-shaped portion. A shaft pin 830 provided substantially at the center of the operation lever 83 slides in the grooves 810a and 810b.

With the configuration described above, when cutting in the forward direction and cutting the grass, the cutting height is adjusted as follows.
That is, in FIG. 8 (a), when the operation lever 83 is tilted backward (in the direction of arrow a), the front wheel height adjusting member 81a and the front leg member 85 are rotated backward about the shaft portion 861 of the bearing portion 86. As shown in FIG. 8B, the base side of the front leg member 85 moves to the front end side of the frame 1. Thereby, the height of the front wheel 31 with respect to the cutter 2 is increased, and the whole of the mower B is inclined so that the front side (right side in FIG. 8) is lowered. That is, since the cutter 2 is also inclined so that the front side in the traveling direction is lowered, the cutting height of the cutter 2 is adjusted to be low.

  Further, when mowing by traveling in the reverse direction, the control lever 83 is tilted forward (in the direction of the arrow b) in FIG. 8 (a), and the base of the chain case 48 as shown in FIG. 8 (c). The side is moved to the rear side of the frame 1. Thereby, the height of the rear wheel 41 with respect to the cutter 2 is increased, and the mower B is inclined so that the rear side (left side in FIG. 8) is lowered. That is, since the cutter 2 is also inclined so that the front side in the traveling direction is lowered, the cutting height of the cutter 2 is adjusted to be low.

As described above, the cutting height of the cutter 2 can be adjusted as appropriate simply by operating the operation lever 83.
It should be noted that by providing means for fixing the operation lever 83 at a required position of the front wheel height adjusting member 81a (or the rear wheel height adjusting member 81b), the cutting height of the cutter 2 is set to an optimum height (for example, steplessly). It is possible to set as appropriate.

  In addition, since the cutting height can be adjusted by tilting the front side of the moving direction of the cutter 2 downward, the stump that is the remainder of the grass cut on the front side of the cutter 2 hits the rear side of the cutter 2 again. Can be prevented. Therefore, the resistance applied to the cutter 2 can be reduced and the grass can be efficiently cut, and the load applied to the cutter drive system including the prime mover 51 can be reduced to improve the durability and fuel consumption.

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FIG. 9 is an explanatory diagram of a use state of the self-propelled mower. With reference to the drawings, the operation of the mower B will be described.
The mower B can travel both forward and backward, and can mow the grass in either direction. Therefore, when the mower B is used, mowing on an inclined surface such as a river bank slope can be performed as follows. As a way of mowing grass,
An example will be described in which grass from one end side to the other end side of the inclined surface is cut in order from the top.

(1) First, the direction of the handle 6 is set upward at a substantially right angle with respect to the traveling direction of the mower B (substantially perpendicular to the tilt direction), and the operator stands sideways with respect to the traveling direction of the mower B. So that mowing can be done.
(2) The operator advances the mower B while walking in the lateral direction, and first mows the grass from the left end to the right end of the inclined surface, for example.
(3) When the grass has been cut to the right end of the inclined surface, the direction of the handle 6 is not changed, and the switching lever 62 is used to switch the rotation of the rear wheel 41 and the rotation of the cutter 2 with the switching lever 62, and the direction of travel of the mower B Reverse. Then, in order to mow the grass one step below, the mower B is slightly advanced in the downward diagonal direction, and then the grass is mowed in the same manner from the right end to the left end of the inclined surface.
(4) After the grass has been cut to the left end of the inclined surface, the traveling direction of the mower B is reversed by the switching lever 62 without changing the direction of the handle 6 as in the operation of (3). Then, after mowing the grass cutter B slightly in the diagonal direction in order to mow the next lower grass, the grass from the left end to the right end of the inclined surface is similarly cut.
(5) Repeat the above operations (3) and (4) to move down the inclined surface and mow the grass on the entire inclined surface.
Contrary to the above-described method of cutting, the grass from one end side to the other end side in the lateral direction of the inclined surface can be cut in order from the bottom.

  If the grass is mowed as described above, the conventional operation of changing the direction of the mower B by moving to a flat ground for each turn-back point is eliminated. Therefore, labor required for mowing can be reduced and work efficiency can be improved.

  Further, since the cover 71 is provided on the front side of the cutter 2 during traveling, the grass is smoothly guided to the cutter 2 regardless of whether the mowing is performed in the forward or reverse direction of the mower B. be able to.

  Furthermore, since the handle 6 is formed to be extendable and retractable, the distance between the mower B main body and the operator can be adjusted. Therefore, it is possible to work while avoiding obstacles such as uneven surfaces and stones and always ensuring a good place for scaffolding. Also, grass that grows in places where workers cannot enter directly, such as under a tree, can be cut from a remote position by extending the handle 6.

[ Reference Example 2]
FIG. 10 is a schematic side view showing Reference Example 2 of the self-propelled mower according to the present invention.
FIG. 11 is a schematic explanatory view of the self-propelled mower shown in FIG.
FIG. 12 is an explanatory view showing a cross section showing the internal structure of the clutch box and the transmission case provided in the rear part of the prime mover in FIG.
FIG. 13 is an enlarged explanatory view of a main part of a cutting height adjusting device provided in the self-propelled mower.
Also, the same or equivalent parts as in Reference Example 1 in the drawings are denoted by the same reference numerals, for the locations are shown in Reference Example 1, was omitted, mainly described Differences. The same applies to Reference Example 3 and Embodiment 1 described later.
The self-propelled mower C and the self-propelled mower B shown in Reference Example 1 are different in terms of the structures of the drive transmission unit, the handle 6c, and the cutting height adjusting device 8c in the clutch box 53.

First, the drive transmission unit in the clutch box 53 will be described with reference to FIG.
The power of the prime mover 51 is transmitted from the drive shaft 531c in the clutch box 53 provided at the rear of the prime mover 51 to the vertical shaft 532c. Further, the vertical shaft 532c is linked to the shift selection shaft 44 via a bevel gear 533 provided in the middle, and the shift selection shaft 44 is linked to the rear drive shaft 43 via a shift gear (not shown). ing. Thereby, the power from the vertical shaft 532c is transmitted to the rear drive shaft 43 to drive the rear wheel 41.

  Further, the drive shaft 531c controls the rotation of the vertical shaft 532c in the forward rotation direction and the reverse rotation direction by a pawl clutch 534c fitted on the distal end side of the vertical shaft 532c. The pawl clutch 534c can move in the axial direction of the vertical shaft 532c, and is fixed in the circumferential direction of the vertical shaft 532c.

Further, each of the forward rotation bevel gear 536c and the reverse rotation bevel gear 535c provided facing each other in the axial direction of the vertical shaft 532c and the bevel gear 537c provided at the tip of the drive shaft 531c are always meshed with each other. 536c and 535c are idle on the vertical axis 532c. The pawl clutch 534c is moved either up or down to be coupled to the forward bevel gear 536c or the reverse bevel gear 535c, and the power of the drive shaft 531c is transmitted to the vertical shaft 532c.
When the pawl clutch 534c is coupled with the forward rotation bevel gear 536c, the rotation of the vertical shaft 532c is in the forward rotation direction. When the pawl clutch 534c is coupled with the reverse rotation bevel gear 535c, the rotation of the vertical shaft 532c is in the reverse rotation direction. Become.

  Thus, when the vertical shaft 532c rotates forward, the rear axle 411 and the cutter 2 rotate in the same manner, the rear wheel 41 rotates in the forward direction, and the cutter 2 rotates inward with respect to the forward direction. It becomes like this. On the other hand, when the rotation of the vertical shaft 532c is switched in the reverse direction, the rear wheel 41 and the cutter 2 are also rotated in the reverse direction, the rear wheel 41 is rotated in the reverse direction, and the cutter 2 is inward with respect to the reverse direction. Rotate in the direction.

In this reference example , the rotation radius of the bevel gear 537c provided on the drive shaft 531c is smaller than the rotation radius of the bevel gears 536c and 535c provided on the vertical shaft 532c. Accordingly, the rotational speed of the vertical shaft 532c with respect to the drive shaft 531c is suppressed to prevent thermal expansion of the lubricating oil in the clutch box 53, and as a result, transmission loss of power to the vertical shaft 532c is prevented.
The rotational speed of the cutter 2 is adjusted to a necessary rotational speed by changing the diameters of the drive pulley 54 and the driven pulley 23 that drive the cutter 2.

Next, the handle 6c will be described.
The handle 6c has a handle main body 64 and an annular handle 65 that is formed in a substantially rectangular shape when viewed from above, with the grip portion rising.
A lever case 63 c having a display function for displaying the traveling direction is provided inside the handle 65. The lever case 63c is provided with a switching lever 62c that changes the traveling direction of the mower C. The switching lever 62c also has a function of adjusting the traveling speed of the mower C and the rotational speed of the cutter.

  A travel clutch 66 that controls the power from the prime mover 51 to the drive wheel and a knife clutch 67 that controls the power from the prime mover 51 to the cutter 2 are provided on the grip portion side of the handle 65. Reference numeral 68 indicates an adjustment lever for adjusting the direction of the handle 6c by rotating it in the horizontal direction with respect to the traveling direction of the mower C. Reference numeral 69 denotes an adjustment lever for adjusting the direction of the handle 6c by inclining in the vertical direction. Reference numeral 61 c indicates an adjustment pin for adjusting the length of the telescopic handle 6. Reference numeral 631c denotes a power switch.

Furthermore, the cutting height adjusting device 8c will be described.
The cutting height adjusting device 8c is different from the cutting height adjusting device 8 shown in the first reference example so as to adjust the cutting height by translating the vehicle body vertically with respect to the front wheel 31 and the rear wheel 41. It is what.

  Main components of the cutting height adjusting device 8c are provided on the right side with respect to the forward direction of the mower C. The cutting height adjusting device 8c includes a front wheel height adjusting member 81c whose base end is fixed to the front end of the front leg member 85, and a rear wheel height adjusting member 81d whose base end is fixed inside the chain case 48. Have.

  Further, the cutting height adjusting device 8c has an operation lever 83c that adjusts the inclination angle of the front wheel height adjusting member 81c and the rear wheel height adjusting member 81d to operate the height (cutting height) of each of the wheels 31, 41. ing. The front wheel height adjusting member 81c, the rear wheel height adjusting member 81d, and the operation lever 83c are formed of a metal plate.

The front end portions of the front wheel height adjusting member 81c and the rear wheel height adjusting member 81d are connected to each other by a shaft portion 811 so as to be rotatable. The shaft portion 811 is fitted in a long hole 881 of a height setting member 88 provided on the frame 1 and is slidable in the vertical direction. The height setting member 88 is one of the constituent members of the cutting height adjusting device 8c, and as shown in FIG. 13, the rear portion side is formed in an L shape toward the right side surface. The protruding portion is provided with a notch groove 882 for fixing the above-described operation lever 83c at a predetermined height position. It is provided.
The operation lever 83c has a handle 832 at the tip, and the portion near the tip fixed to the height setting member 88 is flexible.

  The base end portion of the front wheel height adjusting member 81c is fixed to the front end portion of the front leg member 85 as described above. The front wheel height adjusting member 81c and the front leg member 85 are attached to a shaft portion 861 of a bearing portion 86 on the frame 1 so as to be rotatable in the front-rear direction. Further, as shown in FIG. 11, the connecting shaft 87 c that connects the front leg members 85, 85 across the frame 1 from side to side is formed so as to slightly protrude from the right front leg member 85 to the right side with respect to the traveling direction. The base end portion of the operation lever 83c is fixed to the tip of the protruding portion.

(Work)
FIG. 14 is a schematic explanatory view showing the operation of the cutting height adjusting device. With reference to the drawings, the operation of the cutting height adjusting device 8c of the mower C will be described. In addition, the description is abbreviate | omitted about the same thing among the effects shown in the reference example 1 . The same applies to Reference Example 3 and Embodiment 1 described later.
In the state shown in FIG. 10, the operation lever 83 c is fixed to the uppermost locking groove 882 formed in the height setting member 88. The shaft portion 811 connecting the adjustment members 81c and 81d is at the highest position of the long hole 881, and the front adjustment members 81c and 81d are inclined at the same angle. In this state, the position of the cutter 2 with respect to the front wheel 31 and the rear wheel 41 is high, and the cutting height of the mower C is the highest.

  Next, the operating lever 83c is once removed from the locking groove 882 of the height setting member 88, and this time is fitted into the lowest locking groove 882 to fix the operating lever 83c (see FIG. 14). If it does in this way, the operation lever 83c will fall back, and the front wheel height adjustment member 81c and the front leg member 85 will rotate back centering | focusing on the axial part 861 with it. At the same time, the rear wheel height adjusting member 81 d and the chain case 48 connected via the shaft portion 811 rotate forward about the rear drive shaft 43.

  As described above, when the front wheel height adjusting member 81c and the rear wheel height adjusting member 81d are tilted toward the center of the vehicle body, the front wheel 31 provided on the front leg member 85 side moves toward the front side of the frame 1 and the chain case 48 side. The rear wheel 41 provided at the same time moves to the rear side of the frame 1 simultaneously. Then, the position of the cutter 2 with respect to the front wheel 31 and the rear wheel 41 is the lowest, and the cutting height of the mower C is the lowest.

In this reference example , since the four locking grooves 882 are formed in the vertical direction, the cutting height of the mower C can be reduced by inserting the operation lever 83c into the second locking groove 882. It can be set to a height of about.

[ Reference Example 3]
FIG. 16 is a schematic side view showing Reference Example 3 of the self-propelled mower according to the present invention,
FIG. 17 is a perspective view showing a cutting height adjusting device for a self-propelled mower.
FIG. 18 is a schematic explanatory view of the operating device of the self-propelled mower from above,
FIG. 19 is a schematic explanatory view of the operating device of the self-propelled mower from the right side,
FIG. 20 is a perspective view of the operating device of the self-propelled mower from the back side.
In the description of FIGS. 16 to 20, the front-rear and left-right directions are represented on the basis of FIG. 16, with the right direction being the front, the left direction being the rear, the front side being the right side, and the back side being the left side. In addition, some operation wires extending from various operation levers are omitted.

The self-propelled mower D and the self-propelled mowers B and C shown in the first and second reference examples are mainly directions of the operation lever device 9, the cutting height adjusting device 8d, and the handle 6d of the mower D. The difference is in the adjustment device 60.

  An operation lever device 9 of the self-propelled mower D is provided on the hand side of the handle 6d (near the joint between the handle body 64 and the handle portion 65). As shown in FIG. 18, the operation lever device 9 includes a cutting height operation lever 91, a handle operation lever 92, a throttle lever 93, and a knife clutch lever 94, and includes an operation cover 90 that also serves as a guide member for each lever. ing. The operation cover 90 is formed in an arc shape on the rear side in a plan view, and the entire operation cover 90 is formed so as to be slightly bent forward.

First, the cutting height operation lever 91 and the cutting height adjusting device 8d will be described.
As shown in FIG. 18, the cutting height operation lever 91 is disposed on the right side of the handle body 64 and is operated back and forth along a stepped guide groove 901 formed on the front right side of the operation cover 90. As shown in FIG. 19, the cutting height operation lever 91 has a base portion rotatably attached by a shaft portion 911 of a mounting bar 641 provided perpendicularly to the handle main body 64 on the back side of the operation cover 90. One end of the inner wire W11 of the operation wire W1 is attached slightly below the middle portion of the cutting height operation lever 91. The other end of the inner wire W11 is attached to a rear wheel height adjusting member 81f, which will be described later, and can operate the rear wheel height adjusting member 81f.

Please refer to FIG. 16 and FIG.
The cutting height adjusting device 8d adjusts the cutting height by moving the vehicle body up and down parallel to the front wheel 31 and the rear wheel 41 in the same manner as the cutting height adjusting device 8c (see FIG. 14) shown in Reference Example 2 . It is what I did. Operation of cutting height adjustment device 8d is carried out in the cutting height operation les bar 91 of the operating lever device 9 which will be described later.

  The cutting height adjusting device 8d includes a front wheel height adjusting member 81e whose base end is fixed to the front end of the front leg member 85, and a rear wheel height adjusting member 81f whose base end is fixed inside the chain case 48. Have. The front wheel height adjusting member 81e and the rear wheel height adjusting member 81f are formed of a metal plate, and as shown in FIG. 17, the tip from the substantially central portion is bent toward the center of the vehicle body, and the tip portion is bent again to form the vehicle body. It is almost parallel to the direction of travel.

  A long hole 84 having a required size is formed at the tip of the front wheel height adjusting member 81e. The front wheel height adjusting member 81e and the rear wheel height adjusting member 81f are rotatably connected to each other by a shaft portion 841 that slides along the long hole 84.

  On the right end side of the frame 1, a trapezoidal wire fixing member 88a is provided in a side view. One end of the outer tube of the operation wire W1 extending from the cutting height operation lever 91 is fixed to the attachment piece 883 of the wire fixing member 88a. The distal end portion of the inner wire W11 inserted through the outer tube is fixed to a fixing pin 812 provided on the front side of the rear wheel height adjusting member 81f.

With the configuration as described above, the cutting height operation lever 91 is operated as follows to adjust the cutting height of the mower D.
That is, when the cutting height operation lever 91 is pulled toward the front side (in the direction of arrow I in FIG. 16), the inner wire W11 in the operation wire W1 is pulled. When the inner wire W11 is pulled, the front portions of the front wheel height adjusting member 81e and the rear wheel height adjusting member 81f are pulled toward the top side of the wire fixing member 88a, and the chain case 48 and the front leg member 85 are connected to the shaft portion 861 and the rear drive shaft. It rotates inward about 43. Thereby, the front wheel 31 and the rear wheel 41 are drawn inward, and the cutting height of the mower D is adjusted to be high.

  On the other hand, when the cutting height operation lever 91 is returned to the original position (in the direction opposite to the arrow I direction in FIG. 16), the inner wire W11 in the operation wire W1 is loosened, and the front wheel height adjusting member 81e and the rear wheel height adjusting member The front side of 81f is lowered. When the front side of the front wheel height adjusting member 81e and the rear wheel height adjusting member 81f is lowered, the front leg member 85 and the chain case 48 rotate outwardly about the shaft portion 861 and the rear drive shaft 43. Thereby, the front wheel 31 and the rear wheel 41 are separated from each other, and the cutting height of the mower D is adjusted to be low.

  As described above, the cutting height adjusting device 8d can be operated while holding the handle 6d by the cutting height operating lever 91 provided on the hand side. For example, even if the foot is an unstable inclined surface The cutting height can be adjusted quickly and safely.

In this reference example , as shown in FIG. 18, the guide groove 901 of the cutting height operation lever 91 is formed in four stages, so that the cutting height of the mower D can be adjusted appropriately in four stages. it can.

Further, as shown in FIG. 17, a coil spring 13 is hung between the attachment piece 481 at the right end of the chain case 48 on the rear wheel 41 side and the attachment pin 12 on the frame 1. The urging force of the coil spring 13 acts in a direction that pulls the front wheel 31 and the rear wheel 41 inward (in a direction in which the cutting height increases). Therefore, the load applied to the cutting height operation lever 91 can be reduced, and the cutting height operation lever 91 can be pulled easily. In this reference example , the coil spring 13 is provided only on the right side of the vehicle. However, the coil spring 13 can be similarly provided on the left side of the vehicle.

Furthermore, in the present reference example , the spike portion 410a of the rear wheel 41 is provided so as to be inclined so as not to be parallel to the rotational direction of the wheel but to intersect the rotational direction. Specifically, the spike portion 410a is formed by changing the inclination direction in order of the left oblique direction, the right oblique direction, the left oblique direction,.
In this way, the driving force is improved particularly by preventing skidding on an inclined surface, wrapping of grass or dust, and the rear wheel 41 sticking to the ground.

FIG. 21 is a perspective view showing a steering direction adjusting device,
FIG. 22 is an exploded perspective view of the steering direction adjusting device,
FIG. 23 is a partially cutaway sectional view of the steering wheel direction adjusting device as seen from the right side, and shows the steering wheel direction adjusting mechanism.
The attachment position of the handle main body 64, the handle operating lever 92, and the direction adjusting device 60 of the handle 6d will be described with reference to FIGS.
As shown in FIGS. 18 and 19, the distal end portion of the handle main body 64 is sandwiched from above and below by substantially rectangular fixing plates 95 a and 95 b on the back side of the operation cover 90.

  As shown in FIG. 18, the handle operating lever 92 is disposed on the right rear side of the operation cover 90 and is operated back and forth along the lower end surface of the operation cover 90. The handle operating lever 92 is rotatably attached by a shaft portion 951 provided on the lower surface portion of the lower fixing plate 95b of the fixing plates 95a and 95b (the handle operating lever 92 is omitted in FIG. 19). In FIG. 20, the shaft portion 951 is hidden and cannot be seen). As shown in FIG. 20, one end of the inner wire W21 of the operation wire W2 is attached to the base side slightly from the intermediate portion of the handle operation lever 92. The other end of the inner wire W21 is linked and connected to a direction adjusting device 60 for the handle 6d described later.

The direction adjusting device for the handle 6d is provided in the upper part of the clutch box 53 as shown in FIG. The base side of the handle main body 64 is attached to the direction adjusting device 60 of the handle 6d. In FIG. 16, a cover 60d is attached to the handle direction adjusting device 60, and the handle direction adjusting device 60 is not directly visible from the outside.
The handle 6d can be adjusted by rotating the direction of the handle 6d in the horizontal direction with respect to the direction of travel of the mower D and adjusting the handle 6d by inclining in the vertical direction. it can. The handle direction adjusting device 60 is fixed and released by the handle operating lever 92 described above.

In this reference example , the vertical direction can be adjusted first by pulling the handle operating lever 92 to a required position, and the vertical direction and horizontal direction can be adjusted by pulling deeper (gripping). .
In general, since the frequency of adjustment in the vertical direction is higher than that in the horizontal direction, the mechanism as described above is used so that the vertical adjustment can be performed independently. Note that the angle is easily adjusted because the handle does not fluctuate in the horizontal direction during vertical adjustment.

Reference is made to FIGS.
The handle direction adjusting device 60 includes a substantially semicircular plate-shaped guide body 601 constituting a horizontal direction adjusting means, a rectangular base member 602 in a plan view constituting a vertical direction adjusting means and a horizontal direction adjusting means, and a locking member. It has the stopper member 603 which is.

  The substantially semicircular guide body 601 is fixed on the clutch box 53. A fitting hole 601a into which a shaft portion 538 that protrudes from the clutch box 53 is fitted is provided at substantially the center of the guide body 601. A guide groove 601b is formed in the guide body 601 in a semicircular shape. The guide groove 601b is provided with a plurality of engagement grooves 601c at a required interval in a radial direction centered on the fitting hole 601a of the guide body 601.

The rectangular base member 602 in plan view has side portions 602a and 602a on both the left and right sides. A cylindrical body 602 b into which the shaft portion 538 protruding from the fitting hole 601 a of the guide body 601 is fitted is provided at the approximate center of the base member 602. The base member 602 is disposed on the guide body 601 with the shaft portion 538 fitted into the cylindrical body 602b.
A nut 604 is fixed to the top of the shaft portion 538 protruding from the cylindrical body 602b, and the base member 602 is rotatable on the guide body 601 about the shaft portion 538. A groove 602c is formed on the front side of the base member 602, and a lower stopper 603b of a stopper member 603 described later is fitted into the groove 602c.

The base end portion of the handle main body 64 has a cylindrical shaft tube 642 and is formed in a T shape. A shaft tube 642 of the handle main body 64 is attached to the rear of the side surface portions 602a and 602a of the base member 602 so as to be rotatable up and down around a shaft portion 602d (not shown in FIG. 22, see FIG. 21).
On one end side of the shaft tube 642, a substantially sector-shaped engagement body 643 that constitutes the vertical direction adjusting means is provided. A plurality of guide grooves 643a are provided at a necessary interval on the peripheral side of the engaging body 643. An upper stopper 603d of a stopper member 603, which will be described later, is fitted into the guide groove 643a.

  The stopper member 603 has a cylindrical shaft tube 603a. The stopper member 603 is rotatably attached to the front side of the side surface portion 602a of the base member 602 by a shaft portion 603f (not shown in FIG. 22, see FIG. 21) fitted into the shaft tube 603a. A lower stopper 603b that is bent substantially at a right angle is provided below a substantially middle portion of the shaft tube 603a. The lower stopper 603b locks the engaging groove 601c of the lower guide body 601 from the groove 602c of the base member 602 described above. A fixing pin 603c is attached to the right side surface portion of the lower stopper 603b, and an inner wire W21 of the operation wire W2 extending from the handle operating lever 92 is attached to the fixing pin 603c.

  An upper stopper 603d that is longer than the lower stopper 603b is provided above substantially one end side of the shaft tube 603a. The upper stopper 603d locks the guide groove 643a of the engaging body 643 provided on the handle body 64 described above. A fixing pin 603e is provided on the inner side surface of the upper stopper 603d. A coil spring 605 (omitted in FIG. 22, see FIG. 21) is provided on the nut 604 on the fixing pin 603e and the cylindrical body 602b of the base member 602. The upper stopper 603d is pulled by the coil spring 605 in the direction in which the guide groove 643a of the engaging body 643 is locked.

With the configuration as described above, the handle direction adjusting device 60 is operated as follows to adjust the direction of the handle 6d (see FIG. 23).
In the normal state shown in FIG. 23A, the lower stopper 603b of the stopper member 603 engages the engaging groove 601c of the guide body 601 on the clutch box 53. Further, the upper stopper 603 d of the stopper member 603 locks the guide groove 643 a of the engaging body 643 provided in the handle main body 64.
As described above, the stopper member 603 fixes the handle body 64 and the guide body 601, and the orientation of the handle body 64 cannot be adjusted in this state.

Next, the handle operating lever 92 is pulled to a required position, and the inner wire W21 is pulled until the upper stopper 603d is disengaged from the guide groove 643a of the engaging body 643. When the inner wire W21 is pulled, the stopper member 603 rotates in the direction of arrow I (see FIG. 23 (a)) about the shaft portion 603f to be in the state of FIG. 23 (b).
Since the upper stopper 603d is longer than the lower stopper 603b, the upper stopper 603d is disengaged from the guide groove 643a in this state, but the lower stopper 603b remains engaged with the engagement groove 601c of the guide body 601. It is. Therefore, in this state (FIG. 23B), the handle body 64 can be adjusted by tilting the handle body 64 in the vertical direction, but cannot be adjusted by rotating in the horizontal direction.

  Further, the handle operating lever 92 is pulled to a required position, and the inner wire W21 is pulled until the lower stopper 603b is disengaged from the engaging groove 601c of the guide body 601 (see FIG. 23C). In this state, since the lower stopper 603b is also disengaged from the engagement groove 601c, the direction of the handle 6d can be adjusted by rotating not only in the vertical direction but also in the horizontal direction.

  As described above, the vertical and horizontal adjustments of the handle 6d can be operated by the handle operating lever 92, so that the vertical and horizontal adjustments can be adjusted by different operating means, respectively. Adjustment of 6d can be performed easily and quickly. Further, the handle 6d can be set in the most suitable direction for work by a combination of the vertical direction and the horizontal direction.

  A locking portion 602e protruding downward is provided in the vicinity of the groove 602c provided on the front side of the base member 602. Further, stoppers 601d and 601d that engage with the locking portion 602e are provided at both ends of the outer edge portion formed in an arc shape in the guide body 601. As a result, the locking portion 602e of the base member 602 hits the stoppers 601d and 601d of the guide body 601, and the base member 602 stops, so that the base member 602 rotates within a range of approximately 180 °. It has become.

Please refer to FIG. 18 to FIG.
As shown in FIG. 18, the throttle lever 93 is disposed on the rear side of the operation cover 90 (the rear side of the portion formed in an arc shape). By moving the throttle lever 93 in the left / right and up / down directions, (1) switching of the direction of travel (forward and reverse) of the mower D, (2) switching of the transmission gear (first speed and second speed), and (3) prime mover The rotation speed of 51 can be controlled.

  Notches 903a, 903b, 904a and 904b are provided at four locations on the rear side of the operation cover 90. The throttle lever 93 can be turned in the horizontal direction and fitted further into the notches 903a, 903b, 904a, 904b.

The base side of the throttle lever 93 is bent at a required angle as shown in FIG.
The base end portion of the throttle lever 93 has a horizontal shaft 931 and is formed in a T shape as shown in FIG. The horizontal shaft 931 of the throttle lever 93 is rotatably attached to a bearing portion 960 provided at the rear portion of the substantially circular cam plate 96.
The throttle lever 93 can be operated in the vertical direction by a horizontal shaft 931.

  A circular center hole 961 is opened at the center of the cam plate 96. In the circular center hole 961, a vertical shaft 952 provided perpendicularly to the approximate center of the fixing plates 95 a and 95 b on the back side of the operation cover 90 is inserted. The cam plate 96 is rotatable about a vertical shaft 952.

Between the substantially rectangular fixed plate 95b and the cam plate 96, a traveling direction switching arm 97 and a transmission switching arm 98, which will be described later, are provided.
When viewed from above (see FIG. 18), an engagement groove 970 into which the engagement pin 971 of the traveling direction switching arm 97 is slidably fitted is provided on the right side of the center hole 961 of the cam plate 96. The forward direction switching engagement groove 970 has an opening at the tip thereof along the center hole 961, an opening at an intermediate portion inclined toward the peripheral edge of the cam plate 96, and an end portion thereof. An opening is formed along the peripheral edge of the cam plate 96.

  Similarly, when viewed from above (see FIG. 18), an engagement groove 980 into which an engagement pin 981 of a shift switching arm 98 described later is slidably fitted is provided on the left side of the center hole 961 of the cam plate 96. It is. The shift change engagement groove 980 is formed in a substantially square shape in a plan view, and an inner edge near the center hole 961 is curved along the center hole 961, and an inner edge far from the center hole 961 is substantially linear. Is formed.

  As shown in FIG. 18, a traveling direction switching arm 97 constituting a traveling direction switching means is rotatably attached to the right front corner of the back surface of the fixed plate 95b by a shaft portion 972 (in FIG. 19, the traveling direction switching arm is shown). 97 is omitted). The traveling direction switching arm 97 is formed by bending at a position slightly on the front end side of the central portion, and is formed by curving the base end side in an arc shape.

As shown in FIG. 20, one end side of a coil spring 973 is attached to the base side of the curve portion of the traveling direction switching arm 97. The other end of the coil spring 973 is attached to a support pin 953 provided at the upper left corner of the back surface of the fixed plate 95 in FIG.
A coil spring 974 is attached to the tip of the traveling direction switching arm 97, and one end of the inner wire W31 of the operation wire W3 is attached to the tip of the coil spring 974. The other end of the inner wire W31 is interlocked and coupled to a pawl clutch 534c (see FIG. 12) in the clutch box 53. When the traveling direction switching arm 97 rotates about the shaft portion 972, the inner wire W31 of the operation wire W3 is pulled or loosened, and the traveling direction (forward and backward) of the mower D is switched.
The traveling direction switching arm 97 is pulled in the front-rear direction by a coil spring 973 and a return spring (not shown) provided outside the clutch box 53, and is stopped at a required position.

As shown in FIG. 18, a shift switching arm 98 constituting a shift switching means is rotatably attached to the left front corner of the back surface of the fixed plate 95b by a shaft 982 (in FIG. 19, the shift switching arm 98 is illustrated. Omitted). The shift switching arm 98 is symmetrical with the traveling direction switching arm 97.
As shown in FIG. 20, a coil spring 983 is attached to the distal end portion of the shift switching arm 98, and one end portion of the inner wire W41 of the operation wire W4 is attached to the distal end portion of the coil spring 983. The other end of the inner wire W41 is linked and connected to a speed change selection shaft 44 (see FIG. 12) in the mission case 42. As the speed change arm 98 rotates, the inner wire W41 is pulled or loosened, and the speed change gear (first speed and second speed) is switched.

FIG. 24 is a schematic explanatory diagram illustrating the movement of the throttle lever when the mower is traveling in the forward direction, and FIG. 25 is a schematic explanatory diagram illustrating the movement of the throttle lever when the mower is traveling in the reverse direction. 24 and 25 show a state in which the throttle lever 93 is viewed from the back side (below) of the operation cover 90. FIG.
As described above, by moving the throttle lever 93 in the left-right direction, (1) switching of the advancing direction (forward and reverse) of the mower D and (2) switching of the transmission gear (first speed and second speed) are performed. be able to.
As shown in FIG. 18, the moving direction (forward and reverse) of the mower D is switched by moving the throttle lever 93 from the neutral position to the left (arrow F direction) or the right (arrow R direction). Further, switching of the transmission gear (first speed and second speed) is controlled by an inclination angle of the throttle lever 93 from the neutral position.

First, with reference to FIG. 24, the movement of the throttle lever 93 when the mower D is traveling in the forward direction will be described.
(Neutral N; see FIG. 24 (a))
In the neutral N state, the throttle lever 93 is positioned substantially at the center on the rear side of the operation cover 90.
The engaging pin 971 of the traveling direction switching arm 97 is located at the approximate center of the engaging groove 970 for switching the traveling direction in the cam plate 96. The engagement pin 981 of the shift switching arm 98 is positioned substantially at the center outside the shift switching engagement groove 980.
In the neutral N state, the pawl clutch 534c (see FIG. 12) interlocked with the operation wire W3 of the traveling direction switching arm 97 is not coupled to the forward rotation bevel gear 536c and the reverse rotation bevel gear 535c. Further, the transmission gear that is linked to the operation wire W4 of the transmission switching arm 98 is in the first speed state.

(Forward side, 1st speed F1; see FIG. 24B)
The throttle lever 93 is rotated from the position of the neutral N in the direction of the arrow I and moved to the position of “forward, first speed” (F1, notch 904a). When the throttle lever 93 is moved in the direction of arrow I, the cam plate 96 rotates about the vertical shaft 952, and the engagement pin 971 of the traveling direction switching arm 97 moves to the proximal end side (outside) of the engagement groove 970. To do. Since the engaging pin 971 moves away from the vertical shaft 952 (the distance from the vertical shaft 952 becomes longer), the traveling direction switching arm 97 rotates forward (in the direction of arrow II) about the shaft portion 972. Accordingly, the inner wire W31 of the operation wire 3 of the traveling direction switching arm 97 is loosened in the direction of arrow III, and the traveling direction of the mower D is switched to the forward side.
In this state, the pawl clutch 534c (see FIG. 12) interlocked with the operation wire W3 is coupled to the bevel gear 536c for normal rotation.

  On the other hand, when the cam plate 96 is rotated, the engagement pin 981 of the speed change switching arm 98 moves to the outside of the left end of the engagement groove 980. However, since the distance from the vertical shaft 952 to the engagement pin 981 does not change, the shift switching arm 98 does not rotate. Therefore, the transmission gear remains in the first speed state.

(Forward side, 2nd speed 2F; see FIG. 24C)
The throttle lever 93 is further rotated in the direction of the arrow IV from the position of “advance side, 1st speed” (F1, notch 904a) and moved to the position of “advance side, 2nd speed” (F2, notch 904b). When the throttle lever 93 is moved in the direction of arrow IV, the cam plate 96 is rotated, and the engagement pin 971 of the traveling direction switching arm 97 is moved to the proximal end portion of the engagement groove 970. However, since the distance from the vertical shaft 952 to the engagement pin 971 does not change as compared with the state of “advance side, first speed” (F1, notch 904a), the traveling direction switching arm 97 does not rotate. Therefore, the advancing direction of the mower D does not change and remains in the forward side state.

On the other hand, when the cam plate 96 is rotated, the engagement pin 981 of the shift switching arm 98 moves to the left end inside the engagement groove 980. Since the engagement pin 981 approaches the vertical shaft 952 side (the distance to the vertical shaft 952 becomes shorter), the shift switching arm 98 rotates rearward (in the direction of arrow V).
As a result, the inner wire W41 of the operation wire W4 of the shift switching arm 98 is pulled in the direction of the arrow VI, and the shift gear is switched to the second speed.

Next, with reference to FIG. 25, the movement of the throttle lever 93 when the mower D is driven in the reverse direction will be described.
(Neutral N; see Fig. 25 (a))
The state of neutral N is the same as that in the forward direction already described, and is therefore omitted.

(Backward side, 1st speed R1; see FIG. 25 (b))
The throttle lever 93 is rotated in the direction of the arrow I from the position of the neutral N and moved to the position of “reverse side, first speed” (R1, notch 903a). When the throttle lever 93 is moved in the direction of arrow I, the cam plate 96 rotates about the vertical shaft 952, and the engagement pin 971 of the traveling direction switching arm 97 moves to the distal end side (inside) of the engagement groove 970. . Since the engaging pin 971 approaches the vertical axis 952 (the distance to the vertical axis 952 becomes shorter), the traveling direction switching arm 97 rotates backward (in the direction of arrow II) about the shaft portion 972. As a result, the inner wire W31 of the operation wire W3 of the traveling direction switching arm 97 is pulled in the direction of arrow III, and the traveling direction of the mower D is switched to the reverse side.
In this state, the pawl clutch 534c (see FIG. 12) interlocked with the operation wire W3 is coupled to the reverse bevel gear 535c.

  On the other hand, as the cam plate 96 rotates, the engagement pin 981 of the speed change switching arm 98 moves to the outside of the right end of the engagement groove 980. However, since the distance from the vertical shaft 952 to the engagement pin 981 does not change, the shift switching arm 98 does not rotate. Therefore, the transmission gear remains in the first speed state.

(Reverse side, 2nd speed R2; Fig. 24 (c))
The throttle lever 93 is further rotated in the direction of arrow IV from the position of “reverse side, first speed” (R1, notch 903a), and moved to the position of “reverse side, second speed” (R2, notch 903b). When the throttle lever 93 is moved in the direction of arrow IV, the cam plate 96 rotates, and the engagement pin 971 of the traveling direction switching arm 97 moves to the tip of the engagement groove 970. However, since the distance from the vertical shaft 952 to the engagement pin 971 does not change as compared with the state of “reverse side, first speed” (R1, notch 903b), the traveling direction switching arm 97 does not rotate. Therefore, the traveling direction of the mower D does not change and remains in the reverse side state.

  On the other hand, when the cam plate 96 rotates, the engagement pin 981 of the speed change switching arm 98 moves to the right end inside of the engagement groove 980. In this state, the engagement pin 981 approaches the vertical shaft 952 (the distance to the vertical shaft 952 is shortened), so that the shift switching arm 98 rotates backward (in the direction of arrow V). As a result, the inner wire W41 of the operation wire W4 of the shift switching arm 98 is pulled in the direction of the arrow VI, and the shift gear is switched to the second speed.

In this reference example , in FIG. 18, when the throttle lever 93 is moved to the left (arrow F direction), the advancing direction of the mower D is switched to the forward side, and when it is moved to the right (arrow R direction), it is switched to the reverse side. However, it is not particularly limited to this.
For example, the moving direction of the mower D can be switched to the reverse side when the throttle lever 93 is moved to the left side (arrow F direction), and the forward direction can be switched when the throttle lever 93 is moved to the right side (arrow R direction). In such a case, the positions of the engagement grooves 970 and 980 of the cam plate 96 and the positions of the traveling direction switching arm 97 and the transmission switching arm 98 are symmetric. Other combinations are possible.

The vertical mechanism of the throttle lever 93 will be described with reference to FIGS.
A vertical shaft 952 protruding from the cam plate 96 is provided with a column-shaped elevating cam 932 that constitutes output control means and a link portion 933, a crank portion 935, and the like, which will be described later. The elevating cam 932 and the horizontal shaft 931 of the throttle lever 93 are connected by a link portion 933, and the throttle lever 93 moves the elevating cam 932 up and down via the link portion 933.

  As shown in FIG. 20, a bearing portion 954 is provided at the center of the right end of the fixed plate 95 b, and a crank portion 935 that is rotatably provided by a shaft portion 934 is provided on the bearing portion 954. The crank portion 935 is formed to be bent substantially at the center, and the bent portion is pivotally supported by the shaft portion 934. One end side of the crank portion 935 is rotatably attached to a groove portion formed over the entire circumference of the lifting cam 932 by a shaft portion 936. The fixed pin 937 provided on the other end side of the crank portion 935 is provided with one end portion of the inner wire W51 of the operation wire W5 connected and interlocked with the prime mover 51.

With the configuration as described above, by lowering the throttle lever 93, the lift cam 932 to move up and down the vertical shaft 952, or stretched hits the inner wire W51 of the operating wire W5, loosening.
That is, when the throttle lever 93 is raised (see FIG. 19), the elevating cam 932 moves downward along the vertical shaft 952, and accordingly, the shaft portion 936 of the crank portion 935 also moves downward. When the shaft portion 936 of the crank portion 935 moves downward, the fixing pin 937 of the crank portion 935 is pulled toward the vertical shaft 952 side and pulls the inner wire W51 of the operation wire W5. When the inner wire W51 is tensile et al is, the prime mover 51 is high rotation, the running speed and the rotational speed of the cutter 2 in the mower D increases.

  On the other hand, when the throttle lever 93 is lowered, the elevating cam 932 moves upward along the vertical shaft 952, and accordingly, the shaft portion 936 of the crank portion 935 also moves upward. When the shaft portion 936 of the crank portion 935 moves upward, the fixing pin 937 of the crank portion 935 moves away from the vertical shaft 952, and the operation wire W5 is loosened. When the inner wire W51 of the operation wire W5 is loosened, the rotation of the prime mover 51 is decreased, and the traveling speed of the mower D and the rotational speed of the cutter 2 are decreased.

In this reference example , since the centrifugal clutch is used, when the rotation of the prime mover 51 falls below a certain limit, the power from the prime mover 51 is not transmitted to the rear wheel 41 and the cutter 2. Specifically, in FIG. 12, the centrifugal clutch (without reference numeral) is provided between the prime mover 51 and the drive shaft 531 c in the clutch box 53. When the rotation of the prime mover 51 falls, the power from the prime mover 51 to the drive shaft 531c is cut off, and no power is transmitted to the vertical shaft 532c.

The knife clutch lever 94 will be described.
The knife clutch lever 94 is arranged on the left side of the handle body 64 as shown in FIG. With this knife clutch lever 94, the power transmitted from the prime mover 51 to the cutter 2 is connected or cut off.
The knife clutch lever 94 is operated back and forth along a guide groove 902 formed on the left front side of the operation cover 90. The knife clutch lever 94 is rotatably attached by a shaft portion 941 (not visible in FIG. 18, see FIG. 20) provided on the handle main body 64 on the back side of the operation cover 90.
An inner wire W61 of the operation wire W6 is attached to the proximal end portion of the knife clutch lever 94. This inner wire W61 is linked and connected to a tension clutch mechanism described later, and controls the rotation of the cutter 2.

FIG. 26 is a schematic explanatory view showing a tension clutch mechanism.
The tension pulley mechanism will be described with reference to FIGS.
As shown in FIG. 11, a belt 55 is wound around the driving pulley 54 on the prime mover 51 side and the driven pulley 23 on the cutter 2 side so that power from the prime mover 51 can be transmitted to the cutter 2. Further, the traveling direction of the mower is switched and the rotation direction of the drive pulley 54 is changed, so that the cutter 2 starts to rotate in the reverse direction.

In this reference example , as shown in FIG. 26, tension pulleys 56a and 56b constituting a clutch mechanism are arranged near the driven pulley 23. The tension pulleys 56a and 56b are provided to face the outside of the parallel portion of the belt 55 wound between the pulleys 56a and 56b.
The tension pulley 56a is attached to the tip of an arm 560a formed by being bent slightly at the approximate center. The arm 560a constitutes an oscillating body together with an arm 560b described later. A bent portion of the arm 560a is pivotally supported by a shaft pin 57 so as to be rotatable.
An arm 560b is also rotatably supported on the shaft pin 57. The tension pulley 56b is attached to the tip of the arm 560b.

  A wire fixing portion 561a is fixed to the base end portion of the arm 560a. One end portion of the outer tube of the operation wire W6 extending from the knife clutch lever 94 (see FIG. 18) is fixed to the wire fixing portion 561a. The distal end portion of the inner wire W61 of the operation wire W6 extends from the wire fixing portion 561a and is fixed to the proximal end portion of the arm 560b. A return spring 59 is attached to the tip of the inner wire 61. The distance between the tension pulleys 56a and 56b is adjusted by the inner wire W61.

  With the configuration as described above, when the knife clutch lever 94 (see FIG. 18) is tilted forward, the inner wire W61 is pulled, the arms 560a and 560b are rotated inwardly about the shaft pin 57, and the belt 55 is tension pulley. The tension by 56a, 56b is applied. When the tension is applied, the belt 55 is stretched and power is transmitted from the drive pulley 54 to the driven pulley 23, and the cutter 2 operates.

In practice, the belt 55 on the tension pulley 56a side or the tension pulley 56b side is in a more tensioned state due to the rotation of the drive pulley 54.
For example, when the drive pulley 54 rotates in the direction of arrow I, the tension pulley 56b side is more tensioned than the tension pulley 56a side belt 55. When the inner wire W61 is pulled, the tension pulley 56b on the tensioned belt 55 side is pushed outward, and the tension pulley 56a on the slack side enters inside, and as a result, the arms 560a and 560b It swings in the same direction as the extruded tension pulley 56b. Thereby, the tension for transmitting the driving force is applied to the parallel portions of the belt 55 with a good balance.

  Even when the rotation direction of the drive pulley 54 is switched and the tension side and the slack side of the belt 55 are switched, the tension is applied to the parallel portions of the belt 55 with a good balance as described above. It is reliably transmitted to the driven pulley 23 side.

  On the other hand, when the knife clutch lever 94 (see FIG. 18) is pulled, the inner wire W61 of the operation wire W6 is loosened. When the inner wire W61 is loosened, the arms 560a and 560b are rotated outward, the tension on the belt by the tension pulleys 56a and 56b is released, the belt 55 is loosened, the prime mover 51 is operating, and the drive pulley 54 is rotating. However, the operation of the cutter 2 is stopped.

The travel clutch lever 66a will be described with reference to FIG.
The travel clutch lever 66a is provided on the base side of the handle portion 65 of the handle 6d. The handle portion 65 is sandwiched from above and below by the substantially rectangular fixing plates 95a and 95b. By operating the travel clutch lever 66a, the power from the prime mover 51 to the rear wheel 41 that is the drive wheel is controlled. When the traveling clutch lever 66a is viewed from the front side (not shown), it is substantially M-shaped. The travel clutch lever 66a can be rotated in the direction of arrow II by a shaft portion 661.

  The travel clutch lever 66a is energized in the direction opposite to the arrow II direction by a return spring (not shown) provided on the outside of the clutch box 53, and the travel clutch lever 66a is released by releasing the hand. Will return to its original position. An operation wire (not shown) is provided at one base end of the traveling clutch lever 66a, and the distal end side of the operation wire is linked to a clutch gear (not shown) in the transmission case 42.

  With the above configuration, when the travel clutch lever 66a is gripped and pulled in the direction of arrow I, the operation wire is pulled and the travel clutch is in the “ON” state. In this state, the power from the shift selection shaft 44 shown in FIG. 12 is transmitted to the rear drive shaft 43, and the mower D moves forward or backward.

  On the other hand, when the traveling clutch lever 66a is released, the traveling clutch lever 66a returns to the original position by the biasing force of the return spring, and the operation wire is loosened. When the operation wire is loosened, the power from the shift selection shaft 44 is not transmitted to the rear drive shaft 43, and the travel of the mower D is stopped.

(Work)
With reference to FIGS. 18 and 19, operation methods of various levers in mowing work will be described.
(Before mowing)
Under normal conditions, the travel clutch is disengaged. In this state, the mower D can be moved by pushing or pulling the handle 6d. The throttle lever 93 is in the “neutral” position, and the knife clutch lever 94 is in the “off” state.

(Moving Mower D)
First, the prime mover 51 is started with the traveling clutch disconnected so that the mower D does not start suddenly.
Next, the throttle lever 93 is moved to the position of “forward, first speed” (notch 904a) or “forward, second speed” (notch 904a), and the throttle lever 93 is raised to a required height. Then, the traveling clutch lever 66a is gradually grasped and the mower D is moved forward. Further, as necessary, the throttle lever 93 is moved up and down to increase or decrease the speed of the mower D. The order of the “on / off” operation of the travel clutch lever 66a and the “up / down” operation of the throttle lever 93 is not limited.

  When it is desired to stop the travel of the mower D, the travel clutch lever 66a is released to disengage the travel clutch. In addition, the movement of the mower D without the mowing operation is normally performed in a state where the handle 6d is straight (parallel) with respect to the traveling direction.

(Mowing work on an inclined surface)
(1) Mowing work in the forward direction When performing mowing work, as described in Reference Example 1 (see FIG. 9), the direction of the handle 6d is set with respect to the moving direction of the mower (substantially perpendicular to the inclination direction). Set upward at approximately a right angle. Note that when changing the direction of the handle 6d, the travel clutch lever 66a is released to disengage the travel clutch, and the travel of the mower D is stopped.
When the direction of the handle 6d is changed, the throttle lever 93 is moved to the position of “forward, first speed” (F1) or “forward, second speed” (F2), and the required height position (notch 904a or notch To the side of the portion 904b). The knife clutch lever 94 is set to “ON” so that the power from the prime mover 51 is transmitted to the cutter 2.

Next, the travel clutch lever 66a is gradually grasped. When the traveling clutch is engaged, the mower D advances in the forward direction, and the cutter 2 rotates in the forward direction, so that the mowing work in the forward direction becomes possible.
If necessary, the throttle lever 93 is moved up and down to adjust the traveling speed of the mower D and the rotational speed of the cutter 2. When the throttle lever 93 is lowered to the lowest position, the power from the prime mover 51 is cut off by the centrifugal clutch described above, so that the travel of the mower D and the rotation of the cutter are stopped.

When it is desired to stop the travel of the mower D, the travel clutch lever 66a is released to disengage the travel clutch. However, the cutter 2 continues to rotate unless the knife clutch lever 94 is cut.
Further, when changing the cutting height of the mower D, the cutting height operating lever 91 is operated. The operation of the cutting height operation lever 91 is preferably performed in a state where the traveling of the mower D is stopped for safety.

(2) Mowing work in the backward direction When switching the traveling direction of the mower D to the backward direction, the traveling clutch lever 66a is released and the traveling of the mower D is stopped.
Then, the throttle lever 93 is moved to the “reverse side, first speed” (notched portion 903a) or “reverse side, second speed” (notched portion 903b) side to perform the mowing work.

(End of mowing)
When the mowing operation is completed, the knife clutch lever 94 is turned off and the rotation of the cutter 2 is stopped. Then, the throttle lever 93 is moved to the “advance side, first speed” (notch portion 904a) or “advance side, second speed” (notch portion 904a) side to move the mower D to a flat ground.
When the prime mover 51 is turned off, the travel clutch lever 66a is released to stop the travel of the mower D, and the throttle lever 93 is returned to the "neutral" position.

[Embodiment 1 ]
FIG. 27 shows Embodiment 1 of the self-propelled mower according to the present invention, and is an explanatory view of the mower viewed from the left side (the side where the cutting height adjusting device is not provided).
Unlike the self-propelled mower shown in Reference Examples 1 to 3 , the self-propelled mower E has a four-wheel drive that can transmit the power of the prime mover 51 not only to the rear wheels 41 but also to the front wheels 31. It has become.
On the left side of the mower E, the rear drive shaft 43 extends from the chain case 48 and protrudes. A sprocket 491 that transmits power to the front wheels 31 is provided on the front side of the protruding rear drive shaft 43. Similarly to the rear wheel 41, the axle 311 of each front wheel 31, 31 is provided with a chain case 32 having a sprocket and a chain (both not shown).

Between the sprockets provided on the upper side of the chain cases 32, 32 on the front wheel 31 side, a front drive shaft 33 for interlocking the front wheels 31, 31 is provided. On the left side of the mower E, the front drive shaft 33 extends from the chain case 32 and protrudes. The protruding front drive shaft 33 is provided with a sprocket 492 that receives power from the sprocket 491 of the rear drive shaft 43. A chain 493 is wound between the sprocket 491 on the rear wheel 41 side and the sprocket 492 on the front wheel 31 side. Sprockets 491 and 492 and chain 493 are housed in chain case 494.
In the present embodiment, in order to make the best use of the driving force of the front wheels 31, 31, the tread portion of the front wheel 31 is also provided with a protruding spike portion 410a.

(Work)
The operation of the mower E will be described with reference to FIG.
Power from the prime mover 51 (not appearing in FIG. 27) to the rear drive shaft 43, chain 493 in chain case 494, through the chain in the chain case 32 of the front wheels 31 side, it is transmitted to the front wheels 31, 31.
If the four-wheel drive mower E as described above is used, the mowing work can be performed well even in places where the working conditions such as uneven surfaces and steeply inclined surfaces are bad.

  Note that the terms and expressions used in the present specification are merely explanatory and not restrictive, and do not exclude terms and expressions equivalent to the above terms and expressions. The present invention is not limited to the illustrated embodiment, and various modifications can be made within the scope of the technical idea.

The schematic side view which shows the reference example 1 of the self-propelled mower based on this invention. The schematic front view of the self-propelled mower shown in FIG. The schematic explanatory drawing which looked at the self-propelled mower shown in Drawing 1 from the upper part. Explanatory drawing showing the cross section which showed the clutch box provided in the rear part of the motor | power_engine in FIG. 1, and the internal structure of a mission case. Schematic explanatory drawing which showed the attachment structure of the cover attached to the front-and-rear part of a self-propelled mower. The schematic perspective view which shows the front part side of a self-propelled mower. The schematic perspective view which shows the rear part side of a self-propelled mower. Schematic explanatory drawing which shows the effect | action of a cutting height adjustment apparatus. The use condition explanatory drawing of a self-propelled mower. The schematic side view which shows the reference example 2 of the self-propelled mower based on this invention. Schematic explanatory drawing which looked at the self-propelled mower shown in FIG. 10 from the upper side. Explanatory drawing showing the cross section which showed the clutch box provided in the rear part of the motor | power_engine in FIG. 10, and the internal structure of the transmission case. The principal part expansion explanatory drawing of the cutting height adjustment apparatus provided in the self-propelled mower. Schematic explanatory drawing which shows the effect | action of a cutting height adjustment apparatus. Explanatory drawing of a conventional self-propelled mower. The schematic side view which shows the reference example 3 of the self-propelled mower based on this invention. The perspective view which shows the cutting height adjustment apparatus of a self-propelled mower. The schematic explanatory drawing which looked at the operating device of a self-propelled mower from the upper part. The schematic explanatory drawing which looked at the operating device of the self-propelled mower from the right side. The perspective view which looked at the operating device of the self-propelled mower from the back side. The perspective view which shows the direction adjustment apparatus of a handle | steering-wheel. The disassembled perspective view of the direction adjustment apparatus of a handle. The handle | steering_direction adjustment apparatus is the partially cutaway sectional view seen from the right side, and represents the steering | stirring direction adjustment mechanism. Schematic explanatory drawing which shows the movement of the throttle lever in the case of making a mower drive | work a forward direction. Schematic explanatory drawing which shows the movement of the throttle lever in the case of making a lawn mower drive in the reverse direction. The schematic explanatory drawing which shows a tension pulley mechanism. BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which showed Embodiment 1 of the self-propelled mower based on this invention, and looked at the mower from the left side (the side where the cutting height adjustment apparatus is not provided).

B, C Self-propelled mower 1 Frame 11 Wall portion 2 Cutter 21 Blade plate 22 Vertical shaft 23 Driven pulley 24 Drive gear 24a Driven gear 25 Drive gear 31 Front wheel 311 Front axle 41 Rear wheel 410 Spike part 411 Rear axle 42 Mission Case 43 Rear drive shaft 44 Shift selection shaft 45, 46 Sprocket 47 Chain 48 Chain case 51 Motor 52 Fuel tank 53 Clutch box 531, 531c Drive shaft 532, 532c Vertical shaft 533 Bevel gear 534, 534c Pawl clutch 535, 535c Bevel gear 536, 536c Bevel gear 537, 537c Bevel gear 54 Drive pulley 55 Belt 6, 6c Handle 61, 61c Adjustment pin 62, 62c Switching lever 63, 63c Lever case 631c Power switch 6 Handle body 65 Handle portion 66 Traveling clutch 67 Knife clutch 68 Adjustment lever 69 Adjustment lever 71 Cover 710 Cover body 711 Mounting plate 712 External surface portion 72 Mounting bracket 73 Mounting shaft 74 Nut 8, 8c Cutting height adjusting device 81a Front wheel height adjusting member 810a Groove portion 81b Rear wheel height adjusting member 81c Front wheel height adjusting member 81d Rear wheel height adjusting member 810b Groove portion 811 Shaft portion 83 Operation lever 830 Shaft pin 831 Lever mounting portion 83c Operation lever 832 Handle 85 Front leg member 86 Bearing portion 861 Shaft portion 87a, 87b Connection Shaft 88 Height setting member 881 Long hole 882 Locking groove D, E Self-propelled mower W1-W6 Operation wire W11, W21, W31, W41, W51, W61 Inner wire 6d Handle 8d Cutting height adjustment device 9 Operation lever device 12 Mounting pin 13 Coil spring 32 Chain case 33 Front drive shaft 56a, 56b Tension pulley 57 Shaft pin 58 Fixed portion 59 Spring 60d Cover 60 Handle direction adjusting device 66a Traveling clutch lever 81e Front wheel height adjusting member 81f Rear wheel height adjusting member 84 Long hole 88a Wire Fixed member 90 Operating cover 91 Cutting height operating lever 92 Handle operating lever 93 Throttle lever 94 Knife clutch lever 95a, 95b Fixed plate 96 Cam plate 97 Traveling direction switching arm 98 Shifting switching arm 410a Spike part 481 Mounting piece 491 Sprocket 492 Sprocket 493 Chain 494 Chain case 560a Arm 560b Arm 561a Wire fixing part 601 Guide body 601b Guide groove 601c Engaging groove 601b Cylindrical body 601a Fit Hole 601d Stopper 602d Shaft portion 602e Locking portion 602c Groove 602a Side surface portion 602 Base member 602b Tubular body 603 Stopper member 603a Shaft tube 603b Lower stopper 603c Fixing pin 603f Shaft portion 603d Upper stopper 604 Bar Nut 64 643a Guide groove 643 Engagement body 661 Shaft portion 812 Fixing pin 841 Shaft portion 883 Mounting piece 901 Guide groove 902 Guide groove 903a Notch portion 903b Notch portion 904a Notch portion 904b Notch portion 911 Shaft portion 931 Horizontal shaft 932 Lifting cam 932 Portion 935 Crank portion 936 Shaft portion 937 Fixed pin 941 Shaft portion 951 Shaft portion 952 Vertical shaft 953 Support pin 954 Bearing portion 960 Bearing portion 961 Center hole 970 Engaging groove 9 First engagement pin 972 shaft portion 973 coil spring 974 spring 980 engagement groove 981 engagement pin 982 shaft portion 983 coil spring

Claims (5)

This is a self-propelled mower that has traveling means that can move forward and backward with the power of the prime mover, and that enables workers to mower on the inclined surface by being positioned laterally with respect to the direction of travel of the mower. And
A cutter that rotates horizontally,
A handle that can be set on the side of the grass cutter in the direction of movement and set the direction to the operator side who is mowing the inclined surface,
With
The handle is
An adjustment device that is provided on a base member that can be rotated in the horizontal direction so as to be able to rotate in the vertical direction and includes a horizontal direction adjusting means that can be adjusted in the horizontal direction and a vertical direction adjusting means that can be adjusted in the vertical direction. is configured to allow the direction of adjustment by,
The travel means is
A pair of rear wheels and a pair of front wheels, the power of the prime mover is transmitted to the four wheels of the rear wheel and the front wheel via a chain;
The configuration is
A chain case on the rear wheel side,
A chain case on the front wheel side,
A chain case disposed between the chain case on the rear wheel side and the chain case on the front wheel side;
Have
The chain case on the rear wheel side
A sprocket provided on the axle of the rear wheel;
A sprocket provided on a rear drive shaft for driving the rear wheel;
A chain wound between these sprockets,
Is housed,
The chain case on the front wheel side
A sprocket provided on the axle of the front wheel;
A sprocket provided on the front drive shaft;
A chain wound between these sprockets,
Is housed,
In the chain case disposed between the chain case on the rear wheel side and the chain case on the front wheel side,
A sprocket provided on the rear drive shaft and different from the sprocket provided on the rear drive shaft;
A sprocket provided on the front drive shaft and different from the sprocket provided on the front drive shaft;
A chain wound between these sprockets,
Is housed,
Self-propelled mower. Horizontal direction adjusting means includes means for locking the horizontal rotation of the base member, the vertical adjustment means includes a locking member having means for locking the vertical rotation of the handle,
The self-propelled mower according to claim 1 . The handle is formed to be stretchable,
Self-propelled mowing machine according to any one of claims 1 or 2. An operating lever device for a work machine including a speed change means for changing the speed of the travel means;
Traveling direction switching means for switching the traveling direction of the traveling means;
A shift switching means for shifting the speed change means;
Output control means for controlling the output of the prime mover;
Contains
The control of the traveling direction switching means, the shift switching means, and the output control means can be operated with the same operation lever.
Self-propelled mowing machine according to any one of claims 1-3. The cutting height adjusting means is provided, and the cutting height adjusting means is configured to be operated on the handle side of the handle.
Self-propelled mowing machine according to any one of claims 1-4.

Images