JP3322130B2 - Cutting height equalization method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for equalizing a cutting height in a mower. A method and an apparatus according to the present invention include a body having a rear support means and a front side of which can be adjusted up and down, and a body provided at a position in front of the rear support means which is shifted in front and rear and left and right directions with respect to each other. Front cutting means and rear cutting means respectively facing the ground so that the front side of the cutting plane is lowered.Either of the cutting means swings up and down around an axis extending in the front-rear direction of the body. The present invention is suitably applied to a mower configured to be movable.

[0002]

2. Description of the Related Art A mower as described above is disclosed in, for example,
It is publicly known in JP-A-3-10659. The mowing machine simultaneously operates the cutting means along a horizontal plane and an inclined plane (slope), and simultaneously mows the horizontal plane and the slope while advancing the body. It is a mower suitable for mowing work. Further, according to the mowing machine, by simultaneously operating the respective cutting means along the horizontal plane, the mowing on the horizontal plane can be performed widely.

[0003]

However, in the conventional mowing machine, when the mowing work on the horizontal surface is widened by the cutting means, the mowers are arranged at positions shifted from each other in the front-rear and left-right directions. There was a large difference between the effective cutting heights of the cutting means, and the cutting surface was not always flat.

That is, the mowing machine simultaneously cuts the mowing by the cutting means while advancing the body, and in each of the cutting means, a portion which is actually involved in the mowing operation is formed by a cutting plane. It is the front side of.
Therefore, in the case where the mowing work on the horizontal plane is performed widely, in order to equalize the effective cutting heights of the respective cutting means, the front sides of the respective cutting means are set to have the same ground height. It should be left.

[0005] However, even if the front sides of the cutting planes of the respective cutting means are initially set at the same ground level, if the front side of the body is adjusted vertically to change the cutting height, Since the body is inclined in the front-rear direction, and the respective cutting means are disposed so as to be shifted from each other in the front-rear direction, inevitably, between the front sides of the cutting plane of the respective cutting means. There will be a difference in ground clearance.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a method and an apparatus for constantly equalizing the effective cutting height of each cutting means of a mowing machine as described above.

[0007]

In order to solve the above-mentioned problems, the present invention provides a method for equalizing the cutting height according to the present invention, which comprises a body having a rear support means, the front side of which can be adjusted up and down, and a front and rear and left and right sides. Front cutting means and rear cutting means provided on the body at a position in front of the rear support means so as to be shifted in a direction and facing the ground so that the front side of a cutting plane thereof is lowered. a method in which mutually equalizing the effective cutting height by the respective cutting means vertically swingably constructed comprising mowing machine about an axis extending longitudinally of one said body means, the front side
When the vertical position on the front side of the body is adjusted by the vertical position adjusting means, the one cutting means is adjusted to swing vertically.
Ground height adjusting means, and adjusting the front side vertical position adjusting means.
By operating to the adjustment stage corresponding to the knot stage,
The ground clearances on the front side of the cutting plane of each cutting means should be
It is made to match .

Further, the cutting height equalizing apparatus according to the present invention has a rear support means having a front side adjustable in vertical position and a rear body supporting the rear support means by shifting its position in front and rear and left and right directions. A front cutting unit and a rear cutting unit that are provided on the body at a front position and face the ground so that the front side of the cutting plane is lower, and one of the cutting units is in the front-rear direction of the body. A mower that is configured to be able to swing up and down about an axis extending to the same, so that the effective cutting heights of the respective cutting means are made equal to each other, and a front part that adjusts a vertical position on a front side of the body is provided. Side vertical position adjusting means, and the above-mentioned adjusting means adjusts the vertical position on the front side of the fuselage so as to fill the difference in ground height generated between the front sides of the cutting planes of the respective cutting means. Up and down A ground clearance compensation means allowed to swing regulate freely cutting means vertically, wherein the front-side vertical position
The adjusting means and the ground clearance adjusting means are provided for each of the cutting means.
I will make the ground level on the front side of the cutting plane coincide with each other
As shown in FIG.

According to the method and apparatus according to the present invention,
The upper and lower positions of the front side of the body by the front side vertical position adjusting means.
When the position is adjusted, the ground clearance compensation means is moved to the front part.
To the adjustment stage corresponding to the adjustment stage of the side vertical position adjustment means
Just by operating, the cutting height by each cutting means is automatically
Match each other. Therefore, the cutting height can be easily adjusted.
it can.

In the mowing height equalizing device, the specific configuration of the front-side vertical position adjusting means and the ground height adjusting means is not limited. However, for example, if the following configurations are used, their operations become easy. It is suitable.

That is, the front-side vertical position adjusting means includes a main swing arm provided on the body so as to be vertically swingable and having a main grounding member on the swing end side thereof, which is in contact with the ground. Engagement holes that are respectively located on arcs of different radii from the center of the swing of the main swing arm and that separately coincide with each other when the main swing arm swings are formed on the main swing arm side and the machine body side. And an engaging member which is removably inserted into the engaging hole which coincides with each other and is always urged in the direction of insertion into the engaging hole.

[0012] The above-mentioned height correction means may include a sub-oscillation arm provided on the body so as to be vertically oscillatable, and a sub-ground contact provided on the lower end of the sub-oscillation arm and in contact with the ground. A member, a plurality of sub-swing arm fixing recesses provided on the body side by side along an arc centered on a swing center axis of the sub-swing arm, and a swing upper end of the sub-swing arm An operating member provided on the side of the main body and having an engaging portion with the concave portion for fixing the sub-oscillating arm to release the engagement between them; and the engaging portion for fixing the sub-oscillating arm. And a biasing means for constantly biasing the operation member in a direction to be engaged with the concave portion.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on one embodiment shown in the drawings.

First, an outline of a mower equipped with a cutting height equalizing device according to an embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

The illustrated self-propelled mower is mainly for mowing ridges. According to this mowing machine, the grass growing on the upper surface of the ridge and the slope can be simultaneously mowed while traveling.

The body 1 of the mower includes a base portion A and a tilt portion B that tilts up and down from a horizontal state to an appropriate angle with respect to the base portion A. The tilting part B comprises a slope cutting blade device, while the base part A comprises
The vehicle includes a traveling device, a plane cutting blade device, and a steering device and a drive device of these devices.

The base portion A has a front portion and a rear portion,
The vehicle includes a front wheel 2 which is a free-wheeling wheel as a main grounding member constituting the traveling device, and a driving rear wheel 3 one by one. An elongated plate-shaped rotary blade 4 (hereinafter, referred to as a rotary blade) that rotates in a substantially horizontal plane, as an example of a cutting means, is provided below the base portion A between the front wheel 2 and the rear wheel 3.
It is called "plane cutting blade". ) Is provided. The flat cutting blade 4 is located below a fixed housing 6 whose lower part is open, and the fixed housing 6 constitutes a part of the base portion A. A foot guard 16 is provided at a front portion of the fixed housing 6 so as to protrude forward.

On one of the right and left sides of the base portion A (in the illustrated example, on the left side in the traveling direction of the base portion A),
A tilt housing 7 constituting the tilt portion B is provided. The tilt housing 7 is pivotally supported on the left side of the base portion A via a pivot shaft 8 having an axis XX extending in the front-rear direction. The tilting housing 7 can be fixed in a horizontal state with respect to the base portion A, and can freely move between the horizontal state and a predetermined maximum downward inclined state (for example, a downward inclined state of 60 °). Can tilt up and down. If necessary, it may be provided so that it can be tilted upward within an appropriate range.

An elongated plate-like rotary blade 9 (hereinafter referred to as a "slope cutting blade") is provided below the tilting housing 7 as an example of a cutting means. The side surface cutting blade 9 and the rear wheel 3 as viewed from the side of the body 1
And is located between. The slope cutting blade 9 is tilted in accordance with the tilt of the tilt housing 7, and the flat cutting blade 4 is tilted.
In addition to the flat cutting in cooperation with, we cut the slope of the ridge. A foot guard 16 is also provided at the front of the tilting housing 7 so as to protrude forward.

The tilt housing 7 has an auxiliary wheel 10 which is a free wheel as a sub-grounding member. The auxiliary wheel 10 is rotatably fixed to a lower end portion 17a of an auxiliary wheel support arm 17 extending obliquely downward and forward from a left end front portion of the tilt housing 7 and is in contact with the ground GL.
Rolls as you travel. And the auxiliary wheel 10
Has a function of keeping the tilting housing 7 at a predetermined ground height following the grass cutting surface so that the slope cutting blade 9 always faces substantially parallel to the grass cutting surface such as the slope.

An air-cooled four-cycle gasoline engine 11 is mounted on the base portion A as a cutting blade drive source and a travel drive source, for example. The engine 11 drives the rear wheel 3 and the two rotary blades 4 and 9. The engine 11 is arranged near the driving rear wheel 3 to improve the operability of the body 1.

The body portion A is provided with an airframe operating handle 12 extending rearward in a bifurcated manner.
The body operation handle 12 includes a traveling clutch lever 1.
3, a steering device such as a throttle lever 14, a cutting blade clutch lever 15, and the like are provided. The operator operates the control device including the body operating handle 12 and the various levers 13, 14, 15 and the like, and moves the body 1 on the ridge, while using the two rotary blades 4, 9 to ridge. And the slope which is a slope continuous with the upper surface can be cut simultaneously.

If the tilting housing 7 is used in a horizontal state with respect to the base portion A, the two rotary blades 4 and 9 can efficiently perform a wide and wide mowing operation.

In the mowing machine, the height of the front wheel 2 on the front side of the base portion A can be adjusted by the front-side vertical position adjusting means 50 so that the height of the front wheel 2 with respect to the base portion A can be adjusted. The rear wheel 3 as a rear support means
The vertical position can be adjusted with respect to the ground GL about the axle 3a. This is to make it possible to adjust the effective cutting height of the flat cutting blade 4 as a front cutting means.

Similarly, in order to be able to adjust the effective cutting height of the slope cutting blade 9 as a rear cutting means, the tilting portion B is provided with a mounting height of the auxiliary wheel 10 with respect to the tilting portion B. By making the height adjustable by the ground height compensating means 51, the vertical position of the tilting housing pivot shaft 8 relative to the ground GL can be adjusted.

As shown in FIG. 2, in order to reduce the traveling resistance during the work, the flat cutting blade 4 and the side cutting blade 9 always slightly move the front sides of their cutting planes 4a, 9a. The height of the front portion of the base portion A is set so as to be lowered and approach the ground GL. That is, when the vertical position of the front side of the base portion A is adjusted, the front side of the cutting planes 4a, 9a of the respective cutting blades 4, 9 becomes higher, and This is to prevent the resistance of the cutting grass from increasing.

Further, the flat cutting blade 4 and the side cutting blade 9
Means that when the front side of the base portion A is at the standard height position, the ground heights at the front side of the cutting planes 4a and 9a of the respective cutting blades 4 and 9 coincide with each other, and Mounted against. Therefore, if mowing is performed with the front side of the base portion A fixed at the standard height position, the cutting blades 4 and 9 are moved from the front of the body 1 as shown in FIG. The effective cutting height of each of the cutting blades 4 and 9 is equalized as the standard height H1.

By the way, when the mowing work on the horizontal plane is performed widely using the mowing machine, when the vertical position on the front side of the base portion A is changed from the standard height position to the vertical position, the cutting blades 4 Since the positions of the cutting blades 9 are shifted from each other in the front-rear direction, a difference in ground clearance is inevitably generated between the front sides of the cutting planes 4a and 9a of the respective cutting blades 4 and 9. .

Therefore, when the vertical position of the front side of the base portion A is changed from the standard height position to the vertical position, at the same time, the front sides of the cutting planes 4a, 9a of the respective cutting blades 4, 9 are connected to each other. The slope adjusting blade 51 is vertically swung by using the ground height compensating means 51 so as to fill the difference in the ground height generated therebetween.

For example, as shown in FIG. 5, when the vertical position on the front side of the base portion A is changed downward so that the cutting height by the flat cutting blade 4 is lower than the standard height H1, The cutting plane 9a of the slope cutting blade 9 in the front side has a height H3 on the front side, and the cutting plane 4a of the plane cutting blade 4 in the front.
Is higher than the height H2 on the front side of the front panel. Then, the ground height compensating means 51 is adjusted so that the height H3 on the front side of the cutting plane 9a of the slope cutting blade 9 is adjusted to the height H2 on the front side of the cutting plane 4a of the plane cutting blade 4. By operating, the tilting portion B is swung downward to lower the ground height by H4.

Conversely, when the vertical position of the front side of the base portion A is changed upward so that the effective cutting height of the flat cutting blade 4 is higher than the standard height H1, 9, the height of the cutting plane 9a on the front side becomes lower than the height of the cutting plane 4a of the flat cutting blade 4 on the front side.
The ground clearance of the tilted portion B may be raised by operating the ground clearance correction means 51 so that they match each other.

With the above arrangement, the effective cutting heights of the respective cutting blades 4, 9 always coincide with each other.
When the mowing work on the horizontal plane is widened according to 9, the mowing surface can be substantially flattened.

In FIGS. 4 and 5, the inclination of each of the cutting blades 4, 9 and their cutting height are exaggerated from FIG. 2 for easy understanding.

As the front-side vertical position adjusting means 50 and the ground clearance adjusting means 51, various structures can be adopted. For example, the following structures are preferable.

First, referring mainly to FIGS. 6 to 9,
The front-side vertical position adjusting means 50 will be described.

As shown in FIGS. 1 and 2, the front wheel 2 as a main ground contact member is rotatably fixed to a swing front end 20a of a front wheel support arm 20 as a main swing arm. The front wheel support arm 20 has a smooth upwardly bent portion 20b substantially at the center in the front-rear length direction, and extends forward from the front portion of the base portion A. The front wheel supporting arm 20 has its rear end portion 20c, which is the base end portion of its swinging, in front of the base portion A by a front wheel supporting arm pivot shaft 21 extending horizontally in the left-right direction in the traveling direction of the body 1. It is pivoted to the department. Therefore, the front wheel supporting arm 20 is centered on the front wheel supporting arm
The a side is vertically swingable.

The front wheel supporting arm 20 has the base portion A
Due to the weight of the front side, a force for rotating the swing front end portion 20a relatively upward about the front wheel supporting arm pivot shaft 21 as a center 21a always acts.

Therefore, as shown in FIG. 2, when the front wheel support arm 20 is fixed at a desired inclination angle with respect to the base portion A, the front side of the base portion A is placed on the ground GL at a desired level. Can be highly supported. Therefore, if the inclination angle of the front wheel support arm 20 is changed and fixed, the supporting height H of the base portion A from the ground GL (that is, the cutting height by the plane cutting blade 4) H can be changed.

The means for swinging and fixing the front wheel support arm 20 are constituted, for example, as follows.

A plate-like bracket 22 that swings up and down in a vertical plane is fixed to the front wheel support arm 20 at a position slightly forward of the front wheel support arm pivot shaft 21. The swing bracket 22 has three engaging holes 23 (23a, 23a).
b, 23c). These swing engagement holes 2
3 are arcs C1, C2, C having different radii from the center 21a of the front wheel supporting arm pivot shaft 21, as shown in FIG.
3 respectively.

On the other hand, a plate-shaped fixing bracket 24 is vertically fixed to the front portion of the base portion A adjacent to the swing bracket 22. This fixing bracket 2
4 also has three engagement holes 25 (25a, 25b, 25c).
Are drilled. When the front wheel support arm 20 swings, these positioning engagement holes 25 are used for the swing bracket 22.
And the rocking engagement holes 23 provided in each of them separately coincide with each other. That is, when the uppermost first swing engagement hole 23a and the first fixed position engagement hole 25a coincide with each other, the other swing engagement holes 23b and 23c and the other fixed engagement holes 25a
b and 25c are in a non-coincidence state, and the second swing engagement hole 23b and the second localization engagement hole 25b at the middle position in the vertical direction
And the other rocking engagement holes 23
a, 23c and the other fixed engagement holes 25a, 25c are in a non-coincidence state, and if the lowermost third swing engagement hole 23c and the third localization engagement hole 25c coincide with each other, the other Swing engagement holes 23a, 23b and other fixed engagement holes 25a,
25b is in a mismatch state.

The localization engagement holes 25 are distributed along the trajectory of the swing of the front wheel support arm fixing pin 26 described below.

The engagement holes 23a-25 which coincide with each other
The front wheel support arm fixing pin 26 as an engaging member is horizontally insertable and dismountable in the left, right, left and right directions at a, 23b-25b, and 23c-25c. The front wheel support arm fixing pin 26 is inserted into the engagement holes 23 and 25 that coincide with each other, so that the front wheel support arm 2
0 is fixed so that it cannot swing up and down.

In the illustrated example, the front wheel support arm fixing pin 26
However, when the second engaging holes 23b and 25b that match each other are inserted through each other, the ground height at the front side of the base portion A is an intermediate level which is a standard height, and therefore, Is also an intermediate level corresponding to H1 in FIG. When the front wheel support arm fixing pin 26 is inserted through the first engagement holes 23a and 25a that match each other, the ground clearance on the front side of the base portion A is at the lowest level, and The cutting height of the cutting blade 4 is also the lowest level corresponding to H2 in FIG. Further, the front wheel support arm fixing pin 2
6, when the third engaging holes 23c and 25c that match each other are inserted, the ground height at the front side of the base portion A is the highest level, and the cutting height of the flat cutting blade 4 is also the highest. Level.

In the illustrated example, three swing engagement holes 23 and three localization engagement holes 25 are provided, so that the cutting height of the flat cutting blade 4 can be adjusted in three stages. However, if necessary, it can be adjusted in two steps or four or more steps.

The front wheel support arm fixing pin 26 is slidably inserted in a left and right axial direction into a cylindrical pin holder 27 extending horizontally in the left and right direction. A spring receiving sleeve 27a is screwed into the pin holder 27, and the front wheel support arm fixing pin 26 is a pin urging compression as urging means interposed between the pin 26 and the spring receiving sleeve 27a. The engagement holes 23, 2 are formed by the coil springs 28.
5 is always urged in the direction of insertion.

The pin holder 27 is fixedly supported on the front ends of a pair of left and right pin holder supporting arms 29, 29 extending in the front-rear direction. The pin holder support arm 29,
The rear end portion 29 is fixed to a pin swing center shaft 30 parallel to the front wheel supporting arm pivot shaft 21. The pin swing center shaft 30 is positioned obliquely above and behind the front wheel support arm pivot shaft 21, extends horizontally in the left-right direction of the body 1, and is rotatably supported by the base portion A. . Therefore, the front wheel supporting arm fixing pin 26 and the pin holder 27
Is swingable up and down along an arc C4 centered on the pin swing center axis 30a while maintaining the horizontal state (see FIG. 9).

The operation of the front wheel supporting arm fixing pin 26 is performed by a pin operating lever 31 by an operator operating the body 1. The pin operating lever 31 allows the front wheel supporting arm fixing pin 26 to be pulled out of the engaging holes 23 and 25 which coincide with each other against the urging force of the pin urging compression coil spring 28, and to operate the front wheel supporting pin. The arm fixing pin 26 is operated to swing up and down.

The pin operation lever 31 is pivoted to one end (left end in the illustrated example) of the pin swing center shaft 30 by a lever pivot shaft 32. The lever pivot shaft 3
Numeral 2 extends vertically at right angles to the direction in which the pin holder support arms 29, 29 extend. Front end 31 of the pin operation lever 31 in front of the lever pivot shaft 32
“a” rotatably passes through the left end of the pin operation shaft 33 protruding leftward from the pin holder 27. The pin operation shaft 33 is connected to the front wheel support arm fixing pin 26 inside the pin holder 27. On the other hand, as shown in FIGS. 1 and 2, the rear end 31b of the pin operation lever 31 extends rearward of the fuselage 1 to a range where an operator operating the fuselage 1 can reach.

As shown in FIG. 6, when the operator moves the rear end 31b of the pin operation lever 31 to the right of the body 1, the front end of the pin operation lever 31 about the lever pivot shaft 32 is turned on. The portion 31a moves to the left, and the front wheel support arm fixing pin 26 is pulled out to the left from the engaging holes 23 and 25 where the front wheel support arm fixing pins 26 coincide with each other via the pin operation shaft 33. The front wheel support arm fixing pin 26 is connected to the engagement holes 23, 2
When the operator swings the rear end portion 31b of the pin operation lever 31 up and down while the pin is pulled out from the position 5, the fixed pin 26 swings up and down around the center 30a of the pin swing center axis 30. Move.

It should be noted that the engagement holes 2 which match each other
When the front wheel support arm fixing pin 26 is pulled out from the third and the third 25, the support by the front wheel support arm 20 is lost, and in order to prevent the front side of the base part A from colliding with the ground GL, in the illustrated example, A pin-shaped protrusion 34 projecting horizontally to the fixed bracket 24 side is fixed to the front wheel support arm 20, and the protrusion 34 and the front portion of the fixed bracket 24 abut against each other as stoppers, thereby supporting the front wheel support. Care is taken to limit the maximum swing angle of the arm 20 upward.

Further, between the front side of the base portion A and the front wheel supporting arm 20, there is provided a front wheel supporting arm as urging means for urging the front wheel supporting arm 20 to always swing downward. A biasing compression coil spring 35 is interposed. In the present embodiment, as shown in FIG. 7 and FIG.
0, the front wheel supporting arm pivot shaft 21
A spring receiving piece 36 extending upward through the lower portion of the front bracket is fitted, and the compression coil spring 35 for urging the front wheel supporting arm is interposed between the spring receiving piece 36 and the fixed bracket 24. .

The front-side vertical position adjusting means configured as described above is used as follows.

When changing the cutting height of the flat cutting blade 4, the operator first operates the pin operating lever 31 so that the front wheel supporting arm fixing pins 26 are engaged with the engaging holes. Pull out from 23 and 25. At this moment, the front side of the base portion A temporarily loses the support by the front wheel support arm 20, but the front portion of the fixed bracket 24 and the protrusion 34 of the front wheel support arm 20 come into contact with each other. Since the relative upward swing of the front wheel support arm 20 is restricted, the flat blade 4 does not contact the ground GL.

Next, the operator operates the pin operation lever 31.
Is pivoted upward or downward to pivot the front wheel supporting arm fixing pin 26 downward or upward together with the pin holder 27, so that the pin 26 is moved to the position of the new positioning engagement hole 25 corresponding to the desired cutting height. The front wheel support arm fixing pin 26
To release. Then, the front wheel supporting arm fixing pin 26 automatically protrudes into the new positioning engagement hole 25 by the action of the pin urging compression coil spring 28, and the swing bracket 2
Abut on the side of No. 2. Therefore, the operator pushes down the body operation handle 12 and lifts the front side of the base portion A with the axle 3a of the rear wheel 3 as a fulcrum. At this time, while the side surface of the swing bracket 22 rubs the tip of the front wheel support arm fixing pin 26, the weight of the front wheel support arm 20 side and the action of the compression coil spring 35 for biasing the front wheel support arm cause The front wheel support arm 20 swings downward. The positioning engagement hole 25 in which the swing engagement hole 23 receives the front wheel support arm fixing pin 26.
At the moment when the compression coil spring 28
By the action of the above, the front wheel support arm fixing pin 26 is automatically inserted into the engagement holes 23, 25. Thus, the base portion A
Is changed, and a new cutting height by the flat cutting blade 4 is set.

According to the front-side vertical position adjusting means 50 constructed and operated as described above, when changing the height of the front side of the base portion A, the operator needs to support the machine body 1. Since there is no work, the labor required for the work for adjusting the cutting height of the flat cutting blade 4 is small, and the work is reliable and easy.

Next, with reference to FIGS. 10 to 12, the ground height compensating means 51 will be described.

The auxiliary wheel 10, which is a free-rotating wheel as a sub-grounding member, pivots on the lower end 17a of the auxiliary wheel supporting arm 17 as a sub-oscillating arm, as shown in FIGS. It is freely fixed. The auxiliary wheel support arm 17 is a linear metal bar having a U-shaped cross section extending obliquely downward and forward of the body 1, and has an auxiliary wheel extending in the left-right direction of the body 1 at a substantially middle portion in the longitudinal direction. It is pivotally attached to the tilt housing 7 by a support arm pivot shaft 40.

More specifically, a pair of right and left substantially fan-shaped plate-like mounting members 41, 41 for supporting the auxiliary wheel support arm 17 are provided at the front end position on the left end side on the tilting housing 7. Each of the auxiliary wheel support arm mounting members 41 is placed on the tilt housing 7 so that the keyed portion is located forward, and a left-right interval corresponding to the thickness of the auxiliary wheel support arm 17 is provided therebetween. It is fixed standing up. The auxiliary wheel supporting arm pivot shaft 40 is inserted through the keyed portions of the pair of left and right auxiliary wheel supporting arm mounting members 41, 41.

Due to the weight of the tilting portion B, the swinging lower end portion 17a of the auxiliary wheel supporting arm 17 is pivoted relatively upward about the auxiliary wheel supporting arm pivot shaft 40, and the ground GL The force that tries to reduce the inclination angle with respect to is constantly working.

Therefore, as shown in FIG. 12, if the auxiliary wheel support arm 17 is fixed at a desired tilt angle with respect to the tilt housing 7, the tilt portion B is supported at a desired ground height on the ground GL. can do. Further, by changing and fixing the inclination angle of the auxiliary wheel support arm 17, the ground height of the inclined portion B can be changed.

The means for swinging and fixing the auxiliary wheel support arm 17 are constituted, for example, as follows.

The swing upper end 17b of the auxiliary wheel support arm 17
The side is located above the tilting housing 7, into which a flat rod-shaped operation member 42 is fitted. The operating member 42 is provided with the auxiliary wheel supporting arm 17 having a U-shaped cross section.
And is adapted to be pulled rearward of the body 1 along the longitudinal direction of the auxiliary wheel support arm 17. The operation member 42 is formed of, for example, plastic or the like for weight reduction. At the rear end of the operation member 42, a grip portion 42a having an appropriate shape such as a ring shape is formed.

An auxiliary wheel support arm fixing pin 43 extending parallel to the auxiliary wheel support arm pivot shaft 40 is inserted and fixed at a position near the front end of the operation member 42. The auxiliary wheel support arm fixing pin 43 penetrates the operation member 42 left and right, and both left and right end portions 43a and 43b protrude outward from both left and right side surfaces of the operation member 42, respectively. The right end 43b of the auxiliary wheel support arm fixing pin 43 is
Along the longitudinal direction of the auxiliary wheel support arm 17, the auxiliary wheel support arm 17 is inserted into a long hole 44 formed on the swing upper end 17 b side of the auxiliary wheel support arm 17. The elongated hole 44 and the auxiliary wheel support arm fixing pin 43 come into contact with each other, and serve to regulate the sliding width of the operation member 42.

The left and right end portions 43a and 43b of the auxiliary wheel support arm fixing pin 43 are provided with auxiliary wheel support arm fixing recesses 45 (45a and 45b) formed on the pair of left and right auxiliary wheel support arm mounting members 41 and 41, respectively. , 45c). The auxiliary wheel support arm fixing recesses 45 are vertically arranged along an arc centered on the auxiliary wheel support arm pivot shaft 40 to form a fan-shaped pair of left and right auxiliary wheel support arm mounting members 41, 41. Three are formed on the rear side.

The auxiliary wheel supporting arm fixing recess 45 is provided in the position shown in FIG.
As shown in FIG. 2, it extends along imaginary axes X1, X2, X3 radially extending rearward from the auxiliary wheel supporting arm pivot shaft 40. The auxiliary wheel support arm fixing concave portion 45 engages with the auxiliary wheel support arm fixing pin 43 to fix the auxiliary wheel support arm 17 to the tilt housing 7 via the operating member 42 so as to be adjustable in angle. To act.

In the illustrated example, the auxiliary wheel supporting arm fixing concave portion 45 has a three-tiered structure in upper and lower portions in correspondence with the step of adjusting the ground height on the front side of the base portion A. In addition, the auxiliary wheel supporting arm fixing recess 45 adjusts the front-side vertical position so that the front ground height of the cutting planes 4a, 9a of the respective cutting blades 4, 9 is automatically matched with each other. It is provided in advance in correspondence with each of the engagement holes 23 and 25 of the means 50.

That is, the front-side vertical position adjusting means 5
0, the front wheel supporting arm fixing pin 26 is inserted into the second engagement holes 23b and 25b, which coincide with each other, so that the ground height on the front side of the base portion A and the cutting height of the plane cutting blade 4 are reduced. At the intermediate level corresponding to H1 in FIG.
If the auxiliary wheel supporting arm fixing pin 43 is engaged with the auxiliary wheel supporting arm fixing concave portion 45b at the middle position in the vertical direction, the ground clearance H1 on the front side of the cutting plane 9a of the slope cutting blade 9 becomes the above-mentioned. It automatically matches the ground clearance H1 on the front side of the cutting plane 4a of the plane cutting blade 4. Further, the insertion position of the front wheel support arm fixing pin 26 is changed to the first engagement holes 23a and 25a, and the ground height on the front side of the base portion A and the cutting height of the plane cutting blade 4 are changed as shown in FIG. When the level is changed to the minimum level corresponding to H2, the auxiliary wheel support arm fixing pin 43 is
If the engaging position of the cutting blades 4, 9 is automatically changed to the lowermost position of the auxiliary wheel supporting arm fixing concave portion 45a,
Above the cutting planes 4a, 9a of the front side coincide with H2 in FIG. Similarly, the front wheel support arm fixing pin 26
Is changed to the third engagement holes 23c and 25c, and the ground clearance on the front side of the base portion A and the plane cutting blade 4 are changed.
When the cutting height is changed to the highest level, the engagement position of the auxiliary wheel supporting arm fixing pin 43 is changed to the uppermost auxiliary wheel supporting arm fixing concave portion 45c in accordance with the operation. Automatically, the cutting planes 4a, 4a,
The ground clearance on the front side of 9a coincides with each other.

Therefore, the operator can make them coincide with each other without looking into the lower part of the machine body 1 and comparing the ground height of the cutting blades 4 and 9 with each other.

The length of the elongated hole 44 formed on the swinging upper end 17b side of the auxiliary wheel supporting arm 17 is determined by the length of the operating member 4 along the swinging upper end 17b of the auxiliary wheel supporting arm 17.
2 is moved backward to the limit (until the auxiliary wheel support arm fixing pin 43 comes into contact with the upper end (rear end) of the elongated hole 44), and the auxiliary wheel support arm fixing recess 45
The length of the auxiliary wheel support arm fixing pin 43 engaged with the auxiliary wheel support arm is set to such a length as to be completely removed rearward from the auxiliary wheel support arm fixing recess 45.

The operating member 42 is constantly urged by an appropriate urging means in a direction in which the auxiliary wheel supporting arm fixing pin 43 is engaged with the auxiliary wheel supporting arm fixing recess 45. In the illustrated example, a ring-shaped operating member biasing tension coil spring 46 is provided between the front end portion of the operating member 42 and the auxiliary wheel supporting arm pivot shaft 40, and the operating member 42 is connected to the auxiliary wheel supporting arm. 17 is urged forward (downward) in the longitudinal direction. The operating member biasing tension coil spring 46 is provided inside the auxiliary wheel support arm 17 having a U-shaped cross section, and is rotatably mounted on the auxiliary wheel support arm pivot shaft 40 as shown in FIG. Both ends of the cylindrical member 47 and the holding member 48 having a spring receiving groove 48a fixed inside the front end of the operation member 42 are connected to each other to form a ring shape.

By the urging action of the operating member urging tension coil spring 46, the auxiliary wheel support arm fixing pin 43 is always forcibly inserted into one of the auxiliary wheel support arm fixing recesses 45a, 45b, 45c. It is engaged. For this reason, the engagement state between them is not unexpectedly released.

As shown in FIG. 2, the ground height of the slope cutting blade 9 itself is slightly smaller than that of the flat cutting blade 4 (for example, 2
cm), the cutting height can be even better.

As the cutting means, various means such as a nylon cord cutter and a reciprocating cutter can be used.

[Brief description of the drawings]

FIG. 1 is an overall schematic perspective view of a mower equipped with a mowing height equalizing device according to an embodiment of the present invention, as viewed obliquely from the front left.

FIG. 2 is a schematic side view of the mower shown in FIG. 1 as viewed from the right side.

FIG. 3 is a plan view of a main part of the mower shown in FIG. 1;

FIG. 4 is a front view showing the cutting blade from the front of the body;

FIG. 5 is a front view of the cutting blade as viewed from the front of the fuselage, showing an operation of the ground clearance adjusting means.

FIG. 6 is a perspective view showing the main part of the front-side vertical position adjusting means from the oblique right front of the body.

FIG. 7 is a partially cutaway perspective view of FIG. 6;

FIG. 8 is an exploded perspective view of FIG.

FIG. 9 is a side view of a main part of FIG. 6;

FIG. 10 is a perspective view showing the ground clearance adjusting means from an obliquely left front of the fuselage.

FIG. 11 is an exploded perspective view of a main part of FIG. 10;

FIG. 12 is a partially cutaway side view of a main part of FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 2 Main ground member 3 Rear support means 4 Front cutting means 4a Cutting plane of front cutting means 9 Rear cutting means 9a Cutting plane of rear cutting means 10 Sub ground member 17 Sub swing arm 17a Swing lower end 17b Swing Moving upper end 20 Main swing arm 20a Swing end of main swing arm 21a Center of swing 23, 25, 45 Adjustment stage 23a, 23b, 23c Engagement hole 25a, 25b, 25c Engagement hole 26 Engagement member Reference Signs List 40 swing center axis 42 operating member 43 engaging part 45a, 45b, 45c sub swing arm fixing concave part 46 urging means 50 front side vertical position adjusting means 51 ground clearance adjusting means C1, C2, C3 arc GL ground X −X axis H4 Difference in ground clearance

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-70671 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01D 34/86 A01D 34/74

Claims (4)

(57) [Claims] 1. An airframe (1) having rear support means (3), the front side of which can be adjusted up and down, and a front position of said rear support means (3) shifted from front to back and left and right directions. And the cutting plane (4) provided on the body (1).
a) cutting means (4) and rear cutting means (9) facing the ground (GL) such that the front sides of (a) and (9a) are lowered, and either one of the cutting means (9) is provided. The mowing machine is constructed so as to be able to swing up and down around an axis (XX) extending in the front-rear direction of the machine body (1), so that the effective cutting heights of the cutting means (4) and (9) are equal to each other. A front side vertical position adjusting means (5).
When the vertical position on the front side of the body (1) is adjusted at 0), the one cutting means (9) is adjusted to swing vertically.
Height adjustment means (51) for adjusting the vertical position of the front side.
Operate to an adjustment stage corresponding to the adjustment stage of the means (50).
By this, the cutting plane of each of the cutting means (4) and (9)
The ground clearances on the front side of surfaces (4a) and (9a) are
A method for equalizing the cutting height, characterized in that the cutting height is equalized. 2. An airframe (1) having a rear support means (3), the front side of which can be adjusted up and down, and a front position of the rear support means (3) shifted from front to back and left and right with respect to each other. And the cutting plane (4) provided on the body (1).
a) cutting means (4) and rear cutting means (9) facing the ground (GL) such that the front sides of (a) and (9a) are lowered, and either one of the cutting means (9) is provided. The mowing machine is constructed so as to be able to swing up and down around an axis (XX) extending in the front-rear direction of the machine body (1), so that the effective cutting heights of the cutting means (4) and (9) are equal to each other. A front-side vertical position adjusting means (50) for adjusting a vertical position on a front side of the body (1).
The cutting means (4), when the vertical position on the front side of the body (1) is adjusted by the adjusting means (50).
The vertically swingable cutting means (9) is vertically adjusted so as to fill the difference (H4) in height above the front surface of the cutting planes (4a) and (9a) in (9). allowed to a ground clearance compensation means (51), wherein the front-side vertical position adjustment
The knot means (50) and the ground clearance adjusting means (51)
The cutting planes (4a), (9) of the respective cutting means (4), (9)
so that the ground clearances on the front side of a) match each other
A cutting height equalizing device comprising corresponding adjusting steps (23-25, 45) . 3. The front-side vertical position adjusting means (50).
A main swing arm (2) which is provided on the body (1) so as to be vertically swingable and has a main grounding member (2) which is in contact with the ground (GL) on its swing end (20a) side.
0), and arcs (C1), (C) having different radii from the center (21a) of the swing of the main swing arm (20).
2) and (C3), and the engagement holes (23a-25a, 23b-25b, and 23c) which respectively coincide with each other when the main swing arm (20) swings.
-25c) on the side of the main swing arm (20) and on the side of the body (1), respectively, and the engagement holes (23a-25a, 23b-25b, 23c-25) which coincide with each other.
c) and can be inserted into and removed from the engagement holes (23a-25).
(a, 23b-25b, 23c-25c), comprising an engaging member (26) constantly biased in the direction of insertion thereof.
3. The cutting height equalizing device according to 2. 4. A sub-oscillating arm (17) provided on the body (1) so as to be vertically oscillatable, and a lower swing end of the sub-oscillating arm (17). A sub-grounding member (10) provided on the side of the section (17a) and in contact with the ground (GL), and arranged side by side along an arc centered on a swing center axis (40) of the sub-swing arm (17). A plurality of sub-oscillating arm fixing recesses (45a, 45b, 45c) provided on the body (1) side; and a sub-oscillating arm (17) provided on the upper end (17b) side of the sub-oscillating arm. Sub swing arm fixing recesses (45a, 45
b, 45c), an operating member (42) having an engaging portion (43) for releasing the engaged state therebetween, and the engaging portion (43) is provided with the sub swing arm fixing recess. (45a,
45b, 45c).
The cutting height equalizing device according to claim 2 or 3 , further comprising: an urging means (46) that constantly urges (2).