JPH09172838A - Mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mower, capable of nip cutting a grass stem uncut with an impact of a blade tip in a part of superposed rotary cutting blades and improved in cutting properties by rotating either of the respective cutting blades in the direction mutually facing from the front to the rear relatively to the other. SOLUTION: This mower is obtained by superposing a part on the opposite sides of two left and right rotary cutting blades 16 and 18 in the upper and lower sides at the base of a frame 12 supported by wheels 10 and rotating either of the respective rotary cutting blades 16 and 18 in the direction facing from the front to the rear relatively to the other. Furthermore, the mower is preferably further equipped with a shielding plate 60 capable of receiving grass stems flying to the rear space of the two rotary cutting blades 16 and 18 and dropping the grass stems.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mower having two rotary cutting blades.

[0002]

2. Description of the Related Art There are some grass mowers having a reciprocating (hair clipper) cutting blade and one having a rotary cutting blade. Among them, the rotary cutting blade has a simple structure and can be cut. It has the advantage of scattering the stalk. However, on the other hand, there is a drawback that the grass stems are scattered too much,
There is also a drawback that the cutting becomes uncertain because the grass is cut by the impact.

According to the present invention, by providing two rotary cutting blades in a specific arrangement, the drawbacks thereof are corrected and the advantages are further extended.

[0004]

SUMMARY OF THE INVENTION Under the above problems, according to the present invention, two rotary cutting blades, left and right, are horizontally rotated on the bottom surface of a frame supported by wheels by partially overlapping the opposing cutting blades vertically. (EN) Provided is a mower which is provided so that each rotary blade is rotated in a direction from the front to the rear with respect to the other party.

Further, the present invention provides a mower having the above-mentioned structure, in which a shield plate for receiving and dropping flying grass stalks is provided in the space behind the two rotary cutting blades.

By taking the above-mentioned means by the present invention, most of the grass stems are so-called pinched and cut at a portion where two rotary cutting blades overlap each other, and the cutting is sure. The grass stems cut at the same time are discharged toward the rear of the two rotary cutting blades,
It doesn't scatter around.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a partial sectional side view showing an example of the mower of the present invention, FIG. 2 is a partial sectional front view, and FIG. 3 is a plan view. In the mower according to the present invention, the handle 14 is rearwardly extended on the frame 12 supported by the wheels 10,
Two rotary cutting blades 16 and 18 are horizontally opposed to each other on the bottom surface of the so as to be horizontally rotatable.

In this case, two rotary cutting blades 16 and 18 are used.
Is provided so that a part of the opposite side is vertically overlapped so as to be horizontally rotatable, and both rotary cutting blades 16 and 18 are both rotated in the direction from the front to the rear with respect to the other party. FIG. 2 shows this transmission structure. A transmission cylinder 22 having an engine 20 attached to the upper end of the frame 12 is vertically mounted, and a drive shaft 24 housed in the transmission cylinder 22 is rotatably supported by the frame 12 and penetrates the frame 12. Then, the pulley 26 is fixedly fitted therein.

A transmission box 28 for accommodating a clutch and a speed reduction mechanism (not shown) is interposed between the engine 20 and the transmission cylinder 22, and the output shaft speed of the engine 20 is appropriately reduced. And is transmitted to the drive shaft 24. Two cutting blade shafts 30 and 32 are vertically supported by the frame 12 at symmetrical positions of the pulley 26.
A pulley 34 is fixedly fitted on one of the cutting blade shafts 30 to drive the drive shaft 24.
The pulley 26 and the belt 36 are wound around.

Since it is necessary to give the other cutting blade shaft 32 a rotation direction different from that of the one cutting blade shaft 30, this cutting blade shaft 3
2, the auxiliary shaft 38 is pivotally supported on the frame 12, the pulley 40 is fixedly fitted to the auxiliary shaft 38, and the belt 42 is wound around the pulley 40 and the pulley 26 of the drive shaft 24. The gears 44 and 46 are fixedly fitted to the cutting blade shaft 32 and the auxiliary shaft 38 at the upper side or the like, and the gears 44 and 46 are meshed with each other. And each cutting blade axis 30, 3
The rotary cutting blades 16 and 18 are attached to the lower ends of 2, respectively.

In this case, two rotary cutting blades 16 and 18 are used.
Each is rotated in the direction from the front to the rear of the opponent, so the cutting edge is set in that direction (one cutting blade is turned over and attached). In addition, rotary cutting blades 16 and 1
8 has a structure in which screws are formed at the tips of the cutting blade shafts 30 and 32, and the rotary cutting blades 16 and 18 are passed through the screws to be tightened with nuts. It is preferable to set. Furthermore,
The two rotary cutting blades 16 and 18 are so selected that their opposite sides partially overlap each other vertically.

Besides, for the sake of safety, appropriate covers 48 and 50 are put on the spaces where the pulleys and gears are installed.
Wheel mounting brackets 52 and 54 are provided on both sides of the frame 12 so as to extend rearward.
Attach a and 10b. Further, one wheel mounting bracket 56 is also projected from the center of the front surface of the frame 12, and the wheel 10c is also mounted on this. Therefore, in this example, three wheels 10 are provided for convenience, but more wheels may be provided.

In this case, a strip 58 whose rear end is bent downward is connected to the rear of the frame 12, and a shield plate 60 for covering the rear upper space of the rotary cutting blades 16 and 18 is attached to this strip 58. . It is preferable that the shielding plate 60 is made of a rubber plate or the like, and the rear end of the shielding plate 60 hangs down to the ground.
Further, a steering handle 14 is rearwardly extended behind the frame 12.

As described above, the engine 20 is driven to rotate the two rotary cutting blades 16 and 18, and the handle 14 is operated to cut grass. In this case, there are grass stems that are not cut only by the impact of the blade edge, but such grass stems are guided by the blade edge and guided to the overlapping portion, where they are reliably cut. Further, the grass stems cut in this way are released rearward as they are due to the rotating action of the two rotary cutting blades 16 and 18, so they hit the rear shield plate 60 and fall there. Therefore, this mower has an advantage that the cut grass stems are not scattered unnecessarily around.
The cutting height can be adjusted by adjusting the wheel mounting brackets 52, 5
The mounting angles of the wheels 4 and 56 can be changed, and the height of each wheel 10 is adjusted.

In the above description, the peripheral speeds of the two rotary cutting blades 16 and 18 are intended to be the same, but they may be different peripheral speeds. Two rotary cutting blades 16,
It is expected that if the peripheral speeds of 18 are different, the cuttability at the overlapping portion is increased and the emission direction of the cut grass stems is biased (closer to the higher peripheral speed). In addition to this, the overlap allowance of the two rotary cutting blades 16 and 18 may be appropriate,
There is no particular limitation. However, a very large polymerization charge is not necessary.

FIG. 4 is a cross-sectional view of the cutting blade shafts 30 and 32, but the projection 6 is provided on the outer circumference of the cutting blade shafts 30 and 32 in this example.
4 are formed. Since the cutting blade shafts 30 and 32 are rotating, grass stems are often caught in the cutting blade shafts 30 and 32, which increases the load and reduces the cutting performance. However, by providing such a protrusion 64, a concave portion 66 is formed on the outer periphery of the cutting blade shafts 30, 32, and the winding of the grass stem is loosened by the concave portion 66, making it difficult to wind. Even if it wraps around, it has a loose wrapping, and has the advantage that it can be scattered again by centrifugal force or easily unraveled by hand.

[0017]

As described above, according to the present invention, the grass stem which is not cut by the impact of the cutting edge is a portion where two rotary cutting blades are overlapped with each other, so-called pinched and surely cut. It At the same time, the cut grass stems are released to the rear as they are, and do not scatter in the surroundings.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view showing an example of a mower according to the present invention.

FIG. 2 is a front view, partially in section, showing an example of the mower according to the present invention.

FIG. 3 is a plan view showing an example of a mower according to the present invention.

FIG. 4 is a cross-sectional view of a cutting blade shaft according to the present invention.

[Explanation of symbols]

 10 Wheels 12 Frame 16 Rotary Cutting Blade 18 Rotary Cutting Blade 60 Shielding Plate

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hideto Mitsuoka, 482-1 Otami, Okayama, Okayama Prefecture, Nikkari Co., Ltd. (72) Inventor, Akira Nakata, 482-1, Otami, Okayama, Okayama Prefecture, Nikkali, Inc.

Claims (2)

[Claims] 1. A bottom surface of a frame supported by wheels is provided with two left and right rotary cutting blades so as to be horizontally rotatable by overlapping a part of the opposite sides vertically, and each rotary cutting blade is provided on the other side. On the other hand, a mower characterized by being rotated in the direction from the front to the rear. 2. A shield plate for receiving and dropping flying grass stems is provided in the space behind the two rotary cutting blades.
The mower mentioned.