JP7399074B2 - grass mower - Google Patents

Description

The present invention relates to a lawn mower.

BACKGROUND ART As a mowing device installed in a mower, a device equipped with a rotary cutting blade in which a large number of cutting blades are provided on the side surface of a cylindrical rotating body is widely used. In such a device, the rotary cutting blade is rotated and brought close to the grass to be cut to perform the mowing operation. At this time, in order to regulate the height of the grass remaining after the work, a ground support is used to regulate the height of the rotary cutting blade from the ground.

For example, in the mowing unit included in the mower described in JP-A-2017-35050 (Patent Document 1), a rotary cutting blade is housed in a housing whose lower edge of the side surface is formed into an arc shape. It has a unique structure. In this example, the lower edge of the arcuate housing side serves as a ground support. According to this structure, the mowing work unit can be easily moved to follow the shape of the ground (irregularities and slopes), so the mowing work can proceed smoothly.

JP 2017-35050 Publication

However, depending on the technology disclosed in Patent Document 1, the ground-contacting part of the mowing section is formed in an arc shape, which causes the mowing section to swing when removed from the mower body and attempted to be stored alone. There was a problem.

Therefore, there is a need for a mower that can stand still and stand on its own after being disconnected from the machine body.

The lawn mower according to the present invention includes right and left running devices that support a machine body, and is attached to the front part of the machine body so as to be swingable up and down about a horizontal axis along the left-right direction, and extends forward. Right and left support arms, and a grass cutting device detachably supported on the extending ends of the right and left support arms, the grass cutting device including a cutting blade that is rotatably driven. and a pair of left and right ground supports that slide on the ground so as to lift and support the reaping main body to a predetermined height from the ground, and the ground supports extend along the front-rear direction. The rod-like member is formed in a downwardly curved sled shape so that the middle part is located below the front and rear ends, and the lower edge is formed in a straight line in a part of the ground support. A rod portion is provided, and the linear rod portion is provided across the front and back of the center of gravity position of the mowing main body portion of the mowing device that is disconnected from the mower body , and the front portion of the ground support body is provided with the straight rod portion. The ground supporting body is supported at the front part of the reaping main body part so as to be swingable up and down about the horizontal axis in the left-right direction, and the ground support body, which is swingable up and down about the horizontal axis, can be held at the rear part of the reaping main part part. A holding body is provided, the horizontal axis is located on the front side of the machine body relative to the cutting blade, and the holding body is located on the rear side of the machine body rather than the cutting blade. .

According to this configuration, the mowing device can take an independent posture in which it stands still and stands on its own with the linear rod portion as the ground contact portion. This makes it easy to store the mowing device alone after it has been disconnected from the machine body.

Hereinafter, preferred embodiments of the present invention will be described. However, the scope of the present invention is not limited to the preferred embodiments described below.

The lawn mower according to the present invention includes right and left running devices that support a machine body, and is attached to the front part of the machine body so as to be swingable up and down about a horizontal axis along the left-right direction, and extends forward. Right and left support arms, and a grass cutting device detachably supported on the extending ends of the right and left support arms, the grass cutting device including a cutting blade that is rotatably driven. and a pair of left and right ground supports that slide on the ground so as to lift and support the reaping main body to a predetermined height from the ground, and the ground supports extend along the front-rear direction. The rod-like member is formed in a downwardly curved sled shape so that the middle part is located below the front and rear ends, and the lower edge is formed in a straight line in a part of the ground support. A rod portion is provided, and the linear rod portion is provided across the front and back of the center of gravity of the mowing body of the mowing device that has been disconnected from the mower body, and the ground support body The ground supporting body is provided such that the relative height thereof can be adjusted, and the ground support body is provided so as to be able to adjust the relative height thereof over the entire range from the lower limit to the upper limit of the adjustment range of the relative height, from the position where the cutting blade exists in the cutting main body portion in side view. It is also characterized in that it is configured such that it is also located below.

According to this configuration, no matter how the relative height of the ground support is selected, the ground contact part of the mowing device becomes the ground support and the cutting blade does not become the ground contact part, so that the cutting blade directly contacts the ground. This can prevent damage.

The lawn mower according to the present invention includes right and left running devices that support a machine body, and is attached to the front part of the machine body so as to be swingable up and down about a horizontal axis along the left-right direction, and extends forward. Right and left support arms, and a grass cutting device detachably supported on the extending ends of the right and left support arms, the grass cutting device including a cutting blade that is rotatably driven. and a pair of left and right ground supports that slide on the ground so as to lift and support the reaping main body to a predetermined height from the ground, and the ground supports extend along the front-rear direction. The rod-like member is formed in a downwardly curved sled shape so that the middle part is located below the front and rear ends, and the lower edge is formed in a straight line in a part of the ground support. A rod portion is provided, and the linear rod portion is provided across the front and back of the center of gravity position of the mowing main body portion of the mowing device that is disconnected from the mower body, and the front portion of the ground support body is provided with the straight rod portion. an arcuate rod part supported at the front part of the reaping main body part so as to be swingable up and down about the horizontal axis in the left and right direction, and formed in a partial arc shape with the center of curvature at the horizontal axis at the rear part of the ground supporting body; is provided at the rear of the reaping main body, the arcuate rod portion that swings up and down about the horizontal axis can be inserted and removed, and the arcuate rod portion can be positioned at a plurality of locations in the insertion and removal direction of the arcuate rod portion. It is characterized by being equipped with a holding body that can be held.

According to this configuration, the relative height of the ground support can be easily adjusted.
.

As one aspect of the mower according to the present invention, the mower includes a rotary drum portion having the cutting blade on an outer peripheral portion of the mowing main body portion, and power introduced from the front portion of the machine body is transmitted to the rotary drum portion. an input transmission case portion, and a connecting hitch portion that is removable from a fuselage-side hitch provided at the front portion of the fuselage, and the connecting hitch portion is in a self-supporting position with the linear rod portion in contact with the ground. It is preferable that the height is such that it can be engaged with the body-side hitch.

According to this configuration, when performing an operation to attach the grass cutting device stored in an independent position to the machine body, there is no need to perform an operation to adjust the heights of the machine body side hitch and the connecting hitch portion.

Further features and advantages of the invention will become clearer from the following description of exemplary and non-limiting embodiments, written with reference to the drawings.

FIG. 3 is a right side view of the mower. It is a top view of a lawn mower. FIG. 3 is a perspective view showing a coupling mechanism in a disassembled state and a power transmission mechanism in a disassembled state. FIG. 3 is a plan view showing a power transmission mechanism. It is a side view which shows a tension mechanism and a grounding support. It is a top view which shows a tension mechanism and a grounding support.

A mower is shown in FIGS. 1-6. In FIGS. 1 to 6, F indicates the front direction, B indicates the rear direction, U indicates the upward direction, D indicates the downward direction, R indicates the right direction, and L indicates the left direction. .

[Overall configuration of the mower]
As shown in FIGS. 1 and 2, a lawn mower includes a machine body 1, right and left crawler-type traveling devices 2 that support the machine body 1, and a grass cutting device that is a working device supported at the front of the machine body 1. 3 are provided.

[Aircraft configuration]
The fuselage 1 has a ladder frame shape, and right and left support frames are connected to the front part of the fuselage 1. A flat front wall portion 32 with an opening is connected to the right and left support frames. An upper frame is provided, which is formed by bending a round pipe into a channel shape in plan view, the right and left front parts of the upper frame are connected to the right and left support frames, and the rear part of the upper frame is connected to the rear frame. is connected to the top of the

[Configuration of traveling device]
As shown in FIGS. 1 and 2, the traveling device 2 is provided with a drive wheel 10, a plurality of rolling wheels 11, a guide wheel 12, a track frame 13, a guide member, and a crawler belt 14. .

A plurality of wheels 11 and guide members are supported by a track frame 13, a guide wheel 12 is supported at the rear of the track frame 13, and the track frame 13 is arranged along the front-rear direction. The track frame 13 is a part of the body 1 and a part of the traveling device 2.

As shown in FIGS. 1 to 3, the fuselage 1 is provided with an output shaft 21 that projects forward from the front of a mission case 20. As shown in FIGS. The output shaft 21 is provided along the longitudinal direction of the aircraft body 1. Power that is input from the engine E to the transmission case 20 and changed into working power is output from the output shaft 21.

Right and left drive wheels 10 are supported by a transmission case 20. The right drive wheel 10 is disposed above the front-rear intermediate portion of the right truck frame 13 when viewed from the side, and the left drive wheel 10 is disposed above the front-rear intermediate portion of the left truck frame 13 when viewed from the side. It is located in

[Composition of grass cutting device]
The grass cutting device 3 includes a cutting main body 40 equipped with a rotationally driven cutting blade 41, and a pair of left and right ground supports 60 that slide on the ground so as to lift and support the cutting main body to a predetermined height from the ground. It is equipped with.

(Configuration of the reaping main body)
As shown in FIG. 2, the reaping main body section 40 is configured in a frelmower type in which a rotating drum section 42 on which a large number of cutting blades 41 are supported is rotationally driven around an axis along the left-right direction. That is, a rotary cutting blade is configured in which the cutting blade 41 is provided on the outer periphery of the drive shaft. The rotary cutting blade (the cutting blade 41 and the rotating drum part 42) is housed in a cutting blade housing 43.

The reaping main body section 40 is provided with an input transmission section 44 that transmits power introduced from the front part of the machine body 1 to the rotating drum section 42 . The input transmission section 44 includes an input transmission case section 45 that receives power input from the aircraft body 1, a belt transmission mechanism 46 that transmits the power input from the input transmission case section 45 to the rotating drum section 42, and a belt transmission mechanism 46. and a belt cover 47 that accommodates the belt.

As shown in FIGS. 3 and 4, the input transmission case section 45 includes a relay input shaft 45a that protrudes rearward from the rear of the input transmission case section 45, and a relay input shaft 45a that extends from the right side of the input transmission case section 45 to It has a relay output shaft 45b that projects laterally outward. The relay input shaft 45a is provided along the longitudinal direction of the aircraft body 1. The relay output shaft 45b is provided along the left-right direction of the aircraft body 1.

A first transmission shaft 34 extends from the output shaft 21 toward the input transmission case portion 45 along the longitudinal direction of the aircraft body, and an extended end portion of the first transmission shaft 34 is interlocked and connected to the relay input shaft 45a. A universal joint 36 is provided at each of the end of the first transmission shaft 34 on the output shaft 21 side and the end on the input transmission case portion 45 side. Among these, the universal joint 36 provided at the end on the output shaft 21 side is arranged at the same position as the axis P1 when viewed from the side.

A belt transmission mechanism 46 is provided extending between the relay output shaft 45b of the input transmission case portion 45 and the device input shaft 42a of the mowing device 3, and transmits the power of the relay output shaft 45b to the device input shaft 42a. The device input shaft 42a is constituted by a support shaft of the rotating drum section 42.

Specifically, the belt transmission mechanism 46 includes a second transmission shaft 46a that is interlocked and connected to the relay output shaft 45b, a drive wheel body 46b provided on the second transmission shaft 46a, and a slave provided on the device input shaft 42a. It is constituted by a driving wheel body 46c and a transmission belt 46d wound around the driving wheel body 46b and the driven wheel body 46c. A universal joint portion 48 is provided at each of the end portion of the second transmission shaft 46a on the input transmission case portion 45 side and the end portion on the belt transmission mechanism 46 side.

In the power transmission mechanism, the power of the engine E is transmitted via the transmission case 20, and the power of the rotating output shaft 21 is input to the input transmission case part 45 through the first transmission shaft 34 and the relay input shaft 45a, and the input transmission The power of the relay output shaft 45b of the case portion 45 is transmitted to the belt transmission mechanism 46 by the second transmission shaft 46a, and from the belt transmission mechanism 46 to the device input shaft 42a.

The belt transmission mechanism 46 is provided with a tension mechanism 49 that can adjust the tension of the transmission belt 46d at a position between the driving wheel body 46b and the driven wheel body 46c in the front-rear direction of the mowing device 3. The tension mechanism 49 includes a tension ring 50 that contacts the lower outer periphery of the transmission belt 46d, a slide rod 51 that slides the tension wheel 50 in the vertical direction to change the tension of the transmission belt 46d, and a slide rod 51 that slides up and down. A guide mechanism 53 for guiding the. The tension mechanism 49 is generally a mechanism that adjusts the tension applied to the transmission belt 46d by adjusting the vertical position of the tension wheel 50.

The guide mechanism 53 includes a vertically long guide hole 53a formed along the longitudinal direction of the slide rod 51, and a guide pin 53b that guides the relative movement of the slide rod 51 when inserted into the guide hole 53a. It is equipped. Note that the guide pin 53b is fixed to the side surface of the cutting blade housing 43.

The belt cover 47 is provided with a biasing mechanism 54 that biases the slide rod 51 toward the tension side of the transmission belt 46d. The biasing mechanism 54 includes a coil spring 55 that biases the end portion 51a of the slide rod 51 in a direction to protrude outside the belt cover 47, and an adjustment portion 56 that adjusts the biasing force of the coil spring 55. There is. Specifically, the adjustment portion 56 is implemented as a collar nut screwed onto the end portion 51a of the slide rod 51. The length of the coil spring 55 is regulated by the collar portion of the collar nut coming into contact with the upper end portion of the coil spring 55, thereby adjusting the biasing force of the coil spring 55.

The adjustment portion 56 is configured to be adjustable while exposed to the outside of the belt cover 47. Specifically, as shown in FIG. 5, the end portion 51a of the slide rod 51 is configured to protrude to the outside of the belt cover 47, and the protruding portion is provided with a collar nut as an adjustment portion 56. Therefore, by operating the collar nut exposed to the outside of the belt cover 47, the tension applied to the transmission belt 46d can be adjusted.

The biasing mechanism 54 is equipped with a cylindrical attachment member 57. The cylindrical mounting member 57 supports the end portion 51a of the slide rod 51 that protrudes to the outside of the belt cover 47, allows the slide rod 51 to operate in the direction of adjusting the force, and also allows the adjustment portion 56 to be operated. It has a space 57a for interior decoration. The cylindrical attachment member 57 is attached to the belt cover 47 and is configured to be separable from the belt cover 47 at a position where the adjustment portion 56 is exposed to the outside of the belt cover 47.

The belt cover 47 includes an outer circumferential cover portion 47a that faces the outer circumferential surface of the power transmission belt 46d. Among the outer circumferential cover parts 47a, the outer circumferential cover part 47a is located at a portion facing the lower edge of the tension wheel 50, and the outer circumferential cover portion 47a is located at a portion facing the outer circumferential lower edge of the driving wheel body 46b and the outer circumferential lower edge of the driven wheel body 46c. A recess 47b that allows the tension wheel 50 to enter is formed below the position where the recess 47a exists. Further, the belt cover 47 is formed with an opening 47c that can open the lower part of the tension wheel 50 to the outside, and is also provided with a lid member 47d that can close the opening 47c, and a recess 47b is formed in the lid member 47d. ing.

As shown in FIGS. 1 to 3, vertically elongated right and left brackets 35 are connected to the right and left portions of the front wall portion 32. As shown in FIGS. The right and left support arms 31 are supported by the lower part of the bracket 35 so as to be swingable up and down about an axis P1 along the left-right direction, and extend toward the front side.

Right and left lifting cylinders 33 that can swing the support arm 31 up and down are connected to the upper part of the bracket 35 and the support arm 31, and the lifting cylinders 33 are connected to the support frame via the bracket 35. has been done.

The mowing device 3 is supported by the extending end of the support arm 31. The output shaft 21 and filter 22 of the mission case 20 face the opening 32a of the front wall 32, and the first transmission shaft 34 is connected across the output shaft 21 of the mission case 20 and the mowing device 3. There is.

(Configuration of ground support)
As shown in FIGS. 5 and 6, the ground supporting body 60 is configured to be able to slide on the ground so as to lift and support the reaping main body 40 at a predetermined height from the ground. The ground support 60 is formed in a sled shape that protrudes downward so that the middle part of the rod-like member along the front-rear direction is located below the front and rear ends. The sled-like shape of the ground support 60 is composed of a front rod portion 61, a linear rod portion 62, and an arcuate rod portion 63 in order from the front side.

The linear rod portion 62 is provided across the front and back of the center of gravity of the mowing body 40 of the mowing device 3 that has been disconnected from the machine body 1 .

The ground support 60 is provided so that its height relative to the reaping main body 40 can be adjusted. Specifically, the grounding support 60 is arranged such that the pin 64 is inserted into a through hole provided at the front end of the front rod portion 61 (front part of the grounding support 60), and the horizontal axis P2 in the left-right direction is aligned. It is supported on the lateral outer side of the cutting blade housing 43 in a manner that it can swing up and down around the pin 64, and the relative height of the ground support 60 can be adjusted by swinging the ground support 60 around the pin 64. This allows you to adjust the mowing height.

The arcuate rod portion 63 is formed in a partial arc shape with the center of curvature being the horizontal axis P2. A plurality of through holes 65 are provided in the arcuate rod portion 63. A pin 66, which will be described later, can be inserted into the through hole 65.

A holder 58 capable of holding the arcuate rod portion 63 in position is provided at the rear of the reaping main body portion 40. The holder 58 is provided with a guide portion 58a into which the arcuate rod portion 63 can be inserted and removed, and a hole portion 58b into which a pin 66, which will be described later, can be inserted. One of the plurality of through holes 65 of the arcuate rod portion 63 inserted into the guide portion 58a and the hole portion 58b are aligned so that the positions in the height direction match, and the pin 66 is inserted through the hole portion 58b. By inserting it across the hole 65 and the hole portion 58b, the holding of the arcuate rod portion 63 in position by the holder 58 is completed.

Here, it can be said that the plurality of through holes 65 provided in the arcuate rod portion 63 are provided at a plurality of locations in the insertion/extraction direction of the arcuate rod portion 63 in the guide portion 58a. With this, after adjusting the relative height of the grounding support 60 by swinging the grounding support 60 around the pin 64, the position in the height direction matches the hole portion 58b at the adjusted relative height. By holding the arcuate rod portion 63 in position using the through hole 65, the posture of the ground support 60 can be fixed at an adjusted relative height. According to this configuration, the relative height of the ground support 60 can be easily adjusted.

Note that the ground support 60 is configured to be located below the position of the cutting blade 41 in the reaping main body 40 in a side view over the entire relative height adjustment range from the lower limit to the upper limit. There is. As a result, no matter how the relative height of the grounding support 60 is selected, the grounding part of the mowing device 3 becomes the grounding support 60, and the cutting blade 41 never becomes the grounding part, so that the cutting blade 41 This can prevent damage caused by direct grounding.

Moreover, when the mowing device 3 holds the arcuate rod portion 63 in position using a specific one (referred to as the through hole 65a) of the plurality of through holes 65 of the arcuate rod portion 63, the mowing device 3 It is possible to stably stand on its own by using the linear rod portion 62 as a ground contact portion. As a result, the mowing device 3 that has been disconnected from the body 1 can stably stand on its own with the straight rod portion 62 as the ground contact portion, making it easy to store. Further, the height of the connecting hitch portion 68 in the mowing device 3 in the freestanding position is set at a height that allows engagement with the body-side hitch 67. As a result, when the mowing device 3 stored in a self-supporting position is attached to the machine body 1, it is not necessary to adjust the heights of the machine body-side hitch 67 and the connecting hitch portion 68.

Note that the ground support 60 and the belt cover 47 are provided at overlapping positions in a plan view. Further, the belt cover 47 is provided at a location higher than the upper limit position of the height adjustment range of the ground support 60.

[Other embodiments]
Finally, other embodiments of the lawn mower according to the present invention will be described. Note that the configurations disclosed in each of the embodiments below can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction occurs.

In the above embodiment, the configuration in which the ground supporting body 60 is provided so that the height relative to the reaping main body 40 can be adjusted has been described as an example. However, in the mower according to the present invention, the relative height of the ground support 60 to the cutting main body 40 may be constant. Further, when the relative height is adjustable, the adjustment method is not limited to the method of swinging the ground support 60 around the pin 64 in the above example. Furthermore, even if the ground supporting body is provided in a swingable manner as in the above example, the position of the center of the swinging movement is not limited to the front of the mowing device.

In the above embodiment, the height of the connection hitch portion 68 in the mowing device 3 in the freestanding position is set to a height that allows engagement with the body-side hitch 67, as an example. However, in the lawn mower according to the present invention, the relative positions of the connecting hitch portion and the body-side hitch are not limited as long as they can engage with each other. Furthermore, the mechanism for connecting the machine body and the mowing device is not limited to the hitch.

The mower according to the present invention may be one that can be remotely controlled by a radio control device, or may be of a so-called riding type.

In the above embodiment, an example was shown in which the mowing device 3 is located in front of the machine body 1. However, in the mower according to the present invention, a mowing device may be provided at the rear of the machine body.

In the embodiment described above, an example was shown in which the belt transmission mechanism 46 was provided on the right side of the mowing device 3. However, in the mower according to the present invention, the belt transmission mechanism may be provided on the left side of the mowing device. Further, instead of the belt transmission mechanism, a rotary transmission shaft may be used.

Regarding other configurations, it should be understood that the embodiments disclosed in this specification are illustrative in all respects, and the scope of the present invention is not limited thereby. Those skilled in the art will easily understand that modifications can be made as appropriate without departing from the spirit of the present invention. Therefore, other embodiments that are modified without departing from the spirit of the present invention are naturally included within the scope of the present invention.

INDUSTRIAL APPLICATION This invention can be utilized for a lawn mower, for example.

1 : Machine body 2 : Traveling device 3 : Grass cutting device 40 : Reaping main body part 41 : Cutting blade 42 : Rotating drum part 42a : Device input shaft 43 : Cutting blade housing 44 : Input transmission part 45 : Input transmission case part 45a : Relay input Shaft 45b: Relay output shaft 46: Belt transmission mechanism 46a: Second transmission shaft 46b: Driving wheel body 46c: Driven wheel body 46d: Transmission belt 47: Belt cover 47a: Outer cover portion 47b: Recessed portion 47c: Opening 47d: Lid member 48: Universal joint portion 49: Tension mechanism 50: Tension ring 51: Slide rod 51a: End portion 53: Guide mechanism 53a: Guide hole 53b: Guide pin 54: Biasing mechanism 55: Coil spring 56: Adjustment portion 57: Cylindrical Mounting member 57a: Space portion 58: Holder 58a: Guide portion 58b: Hole portion 60: Ground support 61: Front rod portion 62: Straight rod portion 63: Arc-shaped rod portion 64: Pin 65: Through hole 66: Pin 67 : Aircraft side hitch 68 : Connection hitch part E : Engine P1 : Shaft center P2 : Horizontal shaft center

Claims (4)

right and left traveling devices that support the aircraft;
right and left support arms that are attached to the front part of the aircraft body so as to be swingable up and down about a horizontal axis along the left-right direction and extend forward;
a grass cutting device detachably supported on the extending ends of the right and left support arms;
The mowing device includes a mowing main body having a rotationally driven cutting blade, and a pair of left and right ground supports that slide on the ground so as to lift and support the mowing main body to a predetermined height from the ground. equipped with
The grounding support is formed in a sled shape that protrudes downward so that the middle part of the rod-like member along the front and back direction is located below the front and rear ends,
A part of the grounding support is provided with a straight rod portion having a straight lower edge,
The linear rod portion is provided across the front and back of the center of gravity position of the mowing main body of the mowing device that has been disconnected from the machine body ,
The front part of the ground support is supported by the front part of the reaping main body so as to be swingable up and down about a horizontal axis in the left and right direction,
A holder is provided at the rear of the reaping main body portion, and is capable of holding the ground supporting member vertically swinging around the horizontal axis,
The mower is characterized in that the horizontal axis is located on the front side of the machine body relative to the cutting blade, and the holding body is located on the rear side of the machine body rather than the cutting blade . right and left traveling devices that support the aircraft;
right and left support arms that are attached to the front part of the aircraft body so as to be swingable up and down about a horizontal axis along the left-right direction and extend forward;
a grass cutting device detachably supported on the extending ends of the right and left support arms,
The mowing device includes a mowing main body having a rotationally driven cutting blade, and a pair of left and right ground supports that slide on the ground so as to lift and support the mowing main body to a predetermined height from the ground. equipped with
The grounding support is formed in a sled shape that protrudes downward so that the middle part of the rod-like member along the front and back direction is located below the front and rear ends,
A part of the grounding support is provided with a straight rod portion having a straight lower edge,
The linear rod portion is provided across the front and back of the center of gravity position of the mowing main body of the mowing device that has been disconnected from the machine body,
The ground support is provided so that its height relative to the reaping main body can be adjusted,
The ground supporting body is configured to be located below the position of the cutting blade in the cutting main body section in side view over the entire range from the lower limit to the upper limit of the adjustment range of the relative height. Lawn mower. right and left traveling devices that support the aircraft;
right and left support arms that are attached to the front part of the aircraft body so as to be swingable up and down about a horizontal axis along the left-right direction and extend forward;
a grass cutting device detachably supported on the extending ends of the right and left support arms;
The mowing device includes a mowing main body having a rotationally driven cutting blade, and a pair of left and right ground supports that slide on the ground so as to lift and support the mowing main body to a predetermined height from the ground. equipped with
The grounding support is formed in a sled shape that protrudes downward so that the middle part of the rod-like member along the front and back direction is located below the front and rear ends,
A part of the grounding support is provided with a straight rod portion having a straight lower edge,
The linear rod portion is provided across the front and back of the center of gravity position of the mowing main body of the mowing device that has been disconnected from the machine body,
The front part of the ground support is supported by the front part of the reaping main body so as to be swingable up and down about a horizontal axis in the left and right direction,
A rear part of the ground support is provided with an arcuate rod part formed in a partial arc shape with the center of curvature at the horizontal axis,
A holder capable of inserting and removing the arcuate rod portion that swings up and down about the horizontal axis into the rear part of the reaping main body, and capable of holding the arcuate rod portion in position at a plurality of locations in the insertion and removal direction of the arcuate rod portion. A lawn mower equipped with a body. The reaping main body includes a rotating drum section having the cutting blade on its outer periphery, an input transmission case section for transmitting power introduced from the front part of the machine body to the rotating drum part, and a front part of the machine body. A connecting hitch part that is detachable from the fuselage side hitch provided for the
4. The connecting hitch portion is provided at a height such that it can engage with the fuselage side hitch in a self-supporting position with the linear rod portion in contact with the ground. lawn mower.

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