JP4951098B2 - Traveling lawn mower - Google Patents

Description

  The present invention relates to a traveling lawn mower in which a rotary mower is mounted on a traveling machine body so as to be movable up and down.

  Conventionally, this type of traveling lawnmower is, for example, a traveling machine body supported by a pair of left and right front wheels and a pair of left and right rear wheels, as described in JP-A-9-9757. Among them, a rotary mower is attached to a portion between the left and right front wheels and the left and right rear wheels so that the turfgrass on the ground can be trimmed to an appropriate height by the rotary mower.

  However, in this conventional traveling lawn mower, the cut turf grass cut by the rotary mower is discharged from the discharge port provided on one side surface of the rotary mower in the left-right direction. However, it caused an increase in size.

  Therefore, in a recent traveling type lawn mower, a discharge duct from the rotary mower is disposed so as to extend rearward to a portion between the left and right rear wheels on the lower surface side of the traveling machine body, and the mower is cut in the rotary mower. The harvested turfgrass is configured to be discharged rearward through the discharge duct.

Japanese Patent Laid-Open No. 9-9757

  However, since the rotary mower is mounted so as to be movable up and down with respect to the traveling machine body when traveling in the cutting height adjustment and non-cutting state, the exhaust duct extending rearward from the rotary mower also includes the rotary mower. It must be configured to move up and down with the mower. Therefore, not only the structure is complicated, but also the height from the ground to the traveling aircraft must be increased, and there is a problem that the aircraft height increases.

  The present invention has a technical problem to solve this problem.

To achieve the above object, the traveling-behind lawnmower of the invention according to claim 1, with the two rear wheels and the two front wheels of the traveling machine body supported by a pair of front wheels and also a pair of rear wheels In the traveling lawn mower, in which the rotary mower is mounted so as to be able to move up and down, and between the both rear wheels on the lower surface side of the traveling machine body, the cutting lawn grass discharge duct is arranged to extend backward, Between the rotary mower and the discharge duct, a communication duct configured to communicate the cutout turf discharge port of the rotary mower to the discharge duct is disposed, and the bottom plate forms the bottom of the discharge duct. The rear end side of the bottom plate is pivotally attached, and the front end of the bottom plate is connected to the rotary mower or its lifting mechanism so as to move up and down together with the rotary mower. .

According to the invention described in claim 1, between the two rear wheels and the two front wheels of the traveling machine body supported by a pair of front wheels and also a pair of rear wheels, vertically movable rotary mower On the other hand, in the traveling lawn mower in which the exhaust duct of the mowing turf grass extends between the rear wheels of the lower surface side of the traveling aircraft body so as to extend rearward, the rotary mower and the exhaust duct A communication duct configured to communicate the cut grass turf discharge port in the rotary mower with the discharge duct is disposed between the rear ends of the bottom plate that forms the bottom of the discharge duct. Further, the front end of the bottom plate is connected to the rotary mower or its lifting mechanism so as to move up and down together with the rotary mower. While the turfgrass is smoothly discharged rearward through the discharge duct, it is possible to move up and down only the rotary mower without moving up and down the discharge duct, simplifying the structure, The height from the ground to the traveling aircraft, and hence the height of the aircraft can be reduced. The cut turfgrass that passes through the bottom plate is led to a high part in the discharge duct and then released from the discharge duct. Therefore, when the cutting height is lowered, the cut turfgrass is placed in the discharge duct. The occurrence of clogging due to accumulation can be reliably reduced.

  According to the second aspect of the present invention, a communication duct covering the discharge port of the cutting turf grass is rotatably attached to the rotary mower, and the rear end side of the communication duct is inserted into the discharge duct. Therefore, when the lawn grass cutting height is lowered by moving downward so as to approach the rotary mower, the communication duct that communicates with the rotary mower and the discharge duct is linked to this, The front end side (rotary mower side) is low and the rear end side (exhaust duct side) is high so that the rear end is inclined upward and the upward inclination angle is the height of the grass cutting. Therefore, it is possible to further improve the releasability of the cut turf grass discharged backward through the discharge duct.

1 is a side view of a traveling lawn mower according to an embodiment of the present invention. It is a top view of FIG. It is an enlarged vertical front view which shows the principal part of FIG. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3. FIG. 5 is a sectional view taken along line VV in FIG. 3. It is a figure which shows the state which moved up the rotary mower in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2, reference numeral 1 denotes a traveling machine body supported by a pair of left and right front wheels 2 and a pair of left and right rear wheels 3. The traveling machine body 1 has an engine 4 on the upper surface of the front part thereof. And a steering handle 5 are arranged side by side, and a steering seat 6 and a traveling mission mechanism 7 are provided on the upper surface of the rear part of the steering handle 5 so as to overlap each other.

  Further, on the lower surface side of the traveling machine body 1 and between the front wheels 2 and the rear wheels 3, a pair of left and right rotary cutting blades 8a and 8b and the entire cutting blades 8a and 8b are provided. A rotary mower 8 composed of a cover body 8c covering the cover is mounted so as to be movable up and down. In addition, the raising / lowering mechanism of this rotary mower 8 is abbreviate | omitted.

  The output shaft 4a of the engine 4 protrudes downward from the engine 4 and the rotation of the output shaft 4a is transmitted to the traveling mission mechanism 7 through the endless belt 9 to rotationally drive the rear wheels 3. Thus, the traveling machine body 1 is configured to perform forward traveling or backward traveling.

  On the other hand, the rotation of the output shaft 4a in the engine 4 is transmitted to the rotary cutting blades 8a and 8b in the rotary mower 8 through the endless belt mechanism 10, and the rotary cutting blades 8a and 8b are indicated in the direction indicated by the arrows. The turf grass is trimmed by rotating in the reverse direction, and the trimmed turf with the wind generated by the rotation of the rotary mowing blades 8a and 8b is substantially centered on the rear side of the cover body 8c. It discharges | emits back from the discharge port 8d provided in this.

  A discharge duct 11 having a U-shaped cross section is provided on the rear lower surface side of the traveling machine body 1 so as to extend rearward between the two rear wheels 3. A ceiling plate 11a in the discharge duct 11 is in a horizontal plane. On the other hand, it is inclined obliquely upward toward the rear by an appropriate angle θ1.

  In addition, a bottom plate 12 having a U-shaped cross section is formed at the bottom of the discharge duct 11 so as to form the bottom of the discharge duct 11, and the rear end of the bottom plate 12 is connected to the discharge duct 11. The front end of the rotary mower 8 is connected to the rotary mower 8 or its lifting mechanism through a coupling mechanism (not shown) so as to move up and down together with the rotary mower 8. Has been.

  A communication duct having a U-shaped cross-section facing the discharge duct 11 between the cover 8c and the discharge duct 11 in the rotary mower 8 is provided between the cover 8c and the discharge duct 11. 14 is disposed, and the front end of the communication duct 14 is connected to the cover body 8c via a pin 15 so as to be bendable, and the rear end thereof is a long slot 16 formed in the rear end. A pin 17 provided on the discharge duct 11 is slidably fitted to be connected to the discharge duct 11 so as to be bent.

  In this configuration, with the traveling machine body 1 traveling forward, as shown in FIG. 3, the rotary mower 8 is moved downward so as to approach the ground, and the rotary cutting blades 8a and 8b are rotationally driven. Turf grass on the ground can be cut to a predetermined height, and the cut grass is cut into the discharge duct 11 from the discharge port 8d of the cover body 8c through the communication duct 14 and discharged rearward from the discharge duct 11. Is done.

  In this case, when the rotary mower 8 is lifted away from the ground, the communication duct 14 that communicates the rotary mower 8 and the discharge duct 11 is in a substantially horizontal state as shown in FIG.

  On the other hand, when the turf grass cutting height is lowered by moving the rotary mower 8 so as to be close to the ground, the communication duct that communicates with the rotary mower 8 and the discharge duct 11 in conjunction therewith. 14 is inclined upward toward the rear so that the front end side (rotary mower side) is low and the rear end side (exhaust duct side) is high, and the upward tilt angle θ2 toward the rear is cut. Increasing in proportion to decreasing height.

  Thus, the cut grass that passes through the communication duct 14 is guided to a high portion in the discharge duct 11 and then released from the discharge duct 11. Therefore, when the cutting height is lowered, the discharge duct 11 It is possible to reliably reduce the occurrence of clogging due to the accumulation of cut grass.

  Further, the ceiling plate 11a in the discharge duct 11 is inclined obliquely upward toward the rear by an appropriate angle θ1 with respect to the horizontal plane, so that the cut grass introduced into the discharge duct 11 from the communication duct 14 is discharged. It can reduce that it falls on the ceiling board 11a of the duct 11 and falls.

  As apparent from FIGS. 3 to 6, a rotary mower 8 is mounted between the front wheel 2 and the rear wheel 3 of the traveling machine body 1 so as to be movable up and down. In a traveling lawn mower configured to extend rearwardly, a rear end side of a bottom plate 12 that forms the bottom of the exhaust duct 11 is pivotally attached, and the front end side of the bottom plate 12 is connected to a rotary. It is configured to move up and down in conjunction with the mower 8. Therefore, it is possible to move up and down only the rotary mower 8 without moving up and down the discharge duct 11 while the cut turf grass cut by the rotary mower 8 is smoothly discharged rearward through the discharge duct 11. In addition, the structure can be simplified, and the height from the ground to the traveling machine body 1, and thus the height of the machine body 1 can be reduced. Since the cut turfgrass passing through the bottom plate 12 is guided to a high part in the discharge duct 11 and then discharged from the discharge duct 11, when the cutting height is lowered, the cut turfgrass is inserted into the discharge duct 11. The occurrence of clogging due to accumulation can be reliably reduced.

  As apparent from FIGS. 3 to 6, a communication duct 14 covering the exhaust port 8 d of the cut turf grass is rotatably attached to the rotary mower 8, and the rear end side of the communication duct 14 is connected to the discharge duct 11. Inserted in. Accordingly, when the turf grass cutting height is lowered by moving downward so as to approach the rotary mower 8, the communication duct 14 that communicates the rotary mower 8 and the discharge duct 11 is linked to the front end side. (Rotary mower 8 side) is low and the rear end side (exhaust duct 11 side) is inclined upwards, and the upward inclination angle toward the rear increases the cutting height of turfgrass. Since it increases in proportion to lowering, it is possible to further improve the releasability of the cut turf grass that is discharged rearward through the discharge duct 11.

DESCRIPTION OF SYMBOLS 1 Traveling machine body 2 Front wheel 3 Rear wheel 4 Engine 8 Rotary mower 8d Cutting lawn discharge port 11 Exhaust duct 12 Bottom plate 14 Communication duct

Claims (1)

Between the pair of front wheels and also the two rear wheels and the two front wheels of the traveling machine body supported by a pair of rear wheels, while vertically movably mounted rotary mower, the lower surface side of the traveling machine body Among the above-mentioned rear wheels , in the traveling lawn mower formed by disposing a cut-out lawn grass discharge duct extending backward,
Arranged between the rotary mower and the discharge duct is a communication duct configured to communicate the cutout turf discharge port in the rotary mower with the discharge duct,
The rear end of the bottom plate that forms the bottom of the discharge duct is pivotally attached to the discharge duct, and the front end of the bottom plate is moved up and down together with the rotary mower to the rotary mower or its lifting mechanism. A traveling lawn mower characterized by being connected as described above.

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