JPH09327223A - Mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a mower which can respond to both hard and soft leaves of lawns and increase the performance of cutting the ground-lying lawn leaves by detachably attaching a plate to the almost triangular wind tunnel surrounded by the inner surface of the front wall of the cutting blade housing and the rotary trace of the blades so as to inhibit the wind caused by blade rotation from blowing out. SOLUTION: In a mower which is equipped with a plurality of blades 10 rotating around the vertical shaft axis P inside its cutting blade housing, a plate 16 is detachably attached to the almost triangular wind tunnel Sa surrounded by the inner surface of front wall of the cutting blade housing 9 and the blade rotation trace A so as to prohibit the blade rotation wind from blowing out. In addition, this plate 16 is equipped with a sled-shaped rib 16a projecting downward and, when the rib 16a comes into contact with the uplift of the ground, this rib 16 inhibits the plate 16 from coming into contact with the ground at its whole surface thereby suppressing the soil being shaved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mower in which a plurality of blades that rotate around a longitudinal axis are installed in a cutting blade housing.

[0002]

2. Description of the Related Art A conventional mower is an actual Kaihei 5-55838.
As shown in Japanese Patent Publication, both ends of the blade are provided with draft blades for generating an upward vortex by the rotation of the blade, and guide blades along the rotation trajectory of the blade are provided at the rear of the cutting blade housing. . The rising vortex generated by the wind vanes sucks up the turf and raises it, and blows the cut grass on the front wall side of the cutting blade housing with a rotating rising wind, and the cut grass blown to the front wall is It is adapted to be discharged to the outside along the front wall from the discharge port on the side of the cutting blade housing.

[0003]

In a mower in which a plurality of blades that rotate around the longitudinal axis are installed in the cutting blade housing, between the blade and the front wall of the cutting blade housing,
A triangular cavity that does not reach the rotation trajectory of the blade will be formed, and when a fallen grass with weak elasticity or a fallen grass stepped on by a wheel is caused, the rising vortex generated by the rotation of the blade is It becomes easy to blow from the bottom of the hollow portion. That is, when cutting upright turf with high elasticity, the turf enters the triangular hollow portion in a standing state, whereby the blade rotation wind hits the turf and leakage is suppressed, but a soft lodging When cutting grass that has been stepped on by turf or wheels, the blade rotating wind flows over the upper surface of the turf, and the blade rotating air easily leaks from the gap between the upper surface of the turf and the lower edge of the blade housing. By making the inside a negative pressure, the suction force for sucking the fallen grass and standing it up for cutting is reduced, so that a cutting failure is likely to occur.

The object of the present invention is to suppress the above drawbacks by a simple structural improvement.

[0005]

The present invention according to claim 1 is a mower in which a plurality of blades which rotate around a longitudinal axis are installed in a cutting blade housing, and a blade rotation with respect to an inner surface of a front wall of the cutting blade housing. A plate for preventing the rotation of the blade rotating wind is detachably provided in a substantially triangular cavity surrounded by the locus. [Operation] When cutting soft and laid grass, a blade rotation wind blowout prevention plate is attached to a substantially triangular cavity surrounded by the inner surface of the front wall of the cutting blade housing and the blade rotation locus. In such a case, the blade rotating wind is
The blow-out preventing plate prevents blow-out from the bottom of the triangular hollow portion, the negative pressure can be maintained inside the cutting blade housing, and the fallen grass can be erected. Then, when mowing hard and erect grass, remove it to prevent the grass from being pushed down by the plate. [Effect] As a result of the above configuration, it is possible to improve the cutting performance with respect to the laid grass, and it is possible to deal with it depending on the kind of the turf.

According to the second aspect of the present invention, the plate is provided with sled-shaped ribs protruding downward. [Operation] When the plate comes into contact with the raised portion of the ground, the sled-shaped ribs prevent the entire surface of the plate from coming into contact with the ground, and the earth shaving by the plate is suppressed. [Effect] As a result of the above configuration, the plate for preventing the blade rotating wind from being blown out is provided, and the earth shaving when the plate comes into contact with the raised portion of the ground is suppressed.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to a mid-mount riding lawn mower. FIG. 1 shows the whole of a mid-mount type riding lawn mower. A link mechanism 4 including a pair of left and right front links 4a and a pair of left and right rear links 4b is provided between the front and rear wheels 2 and 3 of a traveling body 1. The mower M is connected via a vertical link 6 that is vertically driven via a hydraulic cylinder 5 to the rear link 4b so that the mower M can be moved up and down. Power is transmitted to the mower M from the power transmission shaft 7 on the body side to the input shaft 8a of the bevel gear case 8 of the mower M.

As shown in FIGS. 2 to 4, the mower M is used.
Is a three-blade type mower in which three blades 10 that rotate around a vertical axis P are housed in a cutting blade housing 9 that is open downward, and a transmission belt 12 that is wound around each blade pulley 11 It is adapted to be rotationally driven in the same direction via the. The mower M has an anti-scaple roller 13 for riding on an obstacle at the front of the cutting blade housing 9, and a gauge wheel 14 for adjusting the cutting height at the rear of the cutting blade housing 9. The cutting blade housing 9 is provided with a grass clippings discharge port 9a on one lateral side thereof, and a front upper wall portion 9b of the cutting blade housing 9 is bulged upward so as to extend along the lateral direction of the machine. Is equipped with. A guide plate 15 is provided on the inner surface of the rear portion of the cutting blade housing 9 for guiding the rotating wind of the blade 10 forward along the rotation locus A of the blade 10. The blades 10a for generating upward eddy currents are formed by bending the corners of both ends of the respective blades 10 on the upper side in the blade rotation direction toward the lower side in the blade rotation direction.
It has. The blade-rotating air flows in the triangular hollow portion Sa on the lower side of the flow path in the grass clippings discharge route R, that is, the substantially triangular hollow portion Sa surrounded by the inner surface of the front wall 9A of the cutting blade housing 9 and the blade rotation locus A. A plate 16 for preventing blowout is provided. The plate 16 is provided with a sled-shaped rib 16a projecting downward in the center, and is detachably attached to the lower surface of the front wall 9A of the cutting blade housing 9 via a bolt 17. Further, the front edge of the plate 16 is the bolt 1
Folded downward to protect 7 heads, and bent pieces 16
The b prevents the 17 bolts from being sheared by the sliding contact of the plate 16 with the raised portion of the ground.

As shown in FIGS. 2 and 5, the mower M is used.
A bending piece 18a extending in the lateral direction of the machine is provided on a bracket 18 fixed to the upper surface of the cutting blade housing 9 that connects the cutting blade housing 9 and the rear link 4b.
The mower M by contacting the upper end of the
It is configured to regulate the rising limit of.

[Other Embodiments] In the above-described embodiment, the leakage of the blade rotation wind is obtained by summing the air volumes on the lower side of the flow path in the cut grass discharge route R, that is, on the upper side of the flow path. Although the plate 16 for preventing the blade rotating wind from being blown out is provided only in the triangular cavity Sa on the lower side of the flow path in the cut grass discharge route R where there are many cases, the leakage of the rotating wind of the blade is higher than that on the lower side of the flow path. Similarly, a plate for preventing the blade rotating wind from blowing may be provided in the triangular cavity Sb on the upstream side of the flow path where the flow rate is small.

Further, the mower may be a two-blade type mower.

In controlling the rising limit of the mower M, as shown in FIG. 6, the bent piece 1 of the bracket 18 is used.
A height adjustable plate 20 may be provided on the inner surface of 8a by means of bolts 19 and a plurality of bolt holes 20a so that the upper limit position of the mower can be adjusted according to the outer diameters of the wheels 2 and 3.

[Brief description of drawings]

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

FIG. 2 is a plan view of a mower.

[Figure 3] Bottom view of mower

FIG. 4 is a vertical side view of the mower.

FIG. 5 is an explanatory view showing the limit of increase of mower.

FIG. 6 is a perspective view of a rising limit regulation structure.

[Explanation of symbols]

 9 Cutting blade housing 9A Cutting blade housing front wall 16 Rotating wind blow prevention plate 16a Sliding rib A Blade rotation locus P Blade rotation axis Sa Sa Triangular cavity

Claims (2)

[Claims] 1. A mower in which a plurality of blades that rotate around a longitudinal axis are installed inside a cutting blade housing, wherein the blades are provided in a substantially triangular cavity surrounded by the inner surface of the front wall of the cutting blade housing and the blade rotation locus. A mower with a detachable plate for preventing the blowing of rotating air. 2. The mower according to claim 1, wherein the plate is provided with sled-shaped ribs protruding downward.