JP3577964B2 - Mowing grass discharge structure of rotary lawn mower - Google Patents

Description

[0001]
[Industrial applications]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mowing system for improving the efficiency of collecting grass in a rotary lawn mower.
[0002]
[Prior art]
A rotary lawn mower is provided with a disk that is rotated by a motor mounted in the motor case of the housing, and a spiral casing having an inner diameter larger than that of the disk is configured toward the discharge port. In some cases, air is sucked from inside the motor case and blown to the casing to form an airflow toward the discharge port. A cutting blade for mowing the turf is provided on the outside of the disk, and the cuttings cut by the cutting blade are discharged from the discharge port with the air flow, and a bucket for grass collection is attached to the discharge port. We are collecting grass.
[0003]
However, in this structure, the wind of the fan is easily blown out in the horizontal direction, and an airflow directed downwardly of the side wall of the casing is easily formed. is there.
[0004]
On the other hand, on the lower surface of the housing, a bottom plate is attached to the lower part of the discharge port so that the user does not touch the cutting blade, and the stalled grass does not reach the discharge port and falls on the bottom plate, If the drop falls near the entrance of the bucket and the discharge port is immediately blocked with grass, the work must be interrupted and the grass collected near the discharge port must be removed even though the bucket is not full. It was bad.
[0005]
[Problems to be solved by the invention]
As a countermeasure, there is a method in which an opening is provided on the way from the cutting blade of the bottom plate toward the discharge port to discharge cut grass falling on the bottom plate due to stall so that the discharge port is not blocked. Work can continue until the bucket is full.
[0006]
However, if the grass is discharged from the opening, the grass collection efficiency is reduced, and even if the bucket is attached, the grass is scattered on the ground after the operation, and the problem to be improved remains.
[0007]
[Means for Solving the Problems]
The present invention solves the above-described problems, and includes a housing 2 having a discharge port 2a in a part of a main body 1, and a motor case 2c forming a cylindrical air passage extending inward from an upper plate 2b of the housing 2. A disk 4 fixed to the motor shaft 3a of the motor 3 mounted in the motor case 2c; a spiral flow having an inner diameter larger than the disk 4 and reaching the discharge port 2a of the housing 2 while surrounding the motor case 2c. A casing 5 having a passage formed therein; and a plurality of blades 4a radially extending from the motor shaft 3a provided on the disk 4 to form a fan 6. The blades 4a suck air from inside the motor case 2c. A plurality of cutting blades 7 for cutting grass are provided on the outer side of the blades 4a of the disk 4 while forming an air flow reaching the discharge port 2a along the casing 5, and the cutting blade 7 cuts the grass. Air flow by fan 6 Placed in a rotary lawnmower discharged from the discharge port 2c and, in disc 4 provided with a cylindrical portion 4b having a constant height inner surface surrounding the outer blade 4a is continuous with the blade 4a Rutotomoni, the the inner wall surface continuous with the blade 4a of the cylindrical portion 4b is provided a tapered 4c to widen the opening upwards, the taper 4c of the tubular portion 4b induces wind fan 6 obliquely upwardly,
The mowing grass is sowed by forming an airflow going upward of the housing 2 while rising along the casing 5 .
[0008]
The upper plate 2b of the housing 2 is provided so as to be inclined so that the side of the discharge port 2a is higher, and the upwardly directed air flow is changed by the tubular portion 4b along the inclined upper plate 2b in the casing 5. Since it was directed to the discharge port 2a, it stalled and did not fall on the upper plate 2b.
[0009]
An inner wall surface of the cylindrical portion 4b of the disk 4 which is continuous with the blades 4a is provided with a taper 4c for widening the opening upward, and the taper 4c guides the wind of the fan 6 obliquely upward and follows the casing 5 along the casing 5. Since the rising air flow was formed, the cut grass flowed smoothly toward the discharge port 2c.
[0010]
[Action]
In the present invention, air is sucked from the inside of the motor case 2c by the blades 4a of the disk 4, but the disk 4 is provided with a cylindrical portion 4b so as to surround the outside of the blade 4a. Since the wind is guided upward, an airflow that flows upward of the housing 2 is formed. For this reason, the cut grass cut by the cutting blade 7 outside the disk 4 soars upward in the airflow, so that the cut grass does not fall on the bottom plate 9 or near the discharge port 2a.
[0011]
Further, the upwardly directed air flow is changed by the upper plate 2b of the housing 2 due to the upward direction of the air flow due to the cylindrical portion 4b. Is to change the direction along the upper plate 2b that is inclined inside the casing 5 without largely changing the blowing direction, and smoothly goes to the discharge port 2a. For this reason, the cut grass soared upward is also discharged from the discharge port 2a without stalling on this air flow.
[0012]
In addition, a taper 4c is provided on the inner wall surface of the cylindrical portion 4b to widen the opening upward to guide the wind of the fan 6 obliquely upward, thereby forming an airflow rising along the casing 5. A strong ascending air flow was formed near the cutting blade 7 outside the portion 4b, and the grass was smoothly carried to the discharge port 2a by riding this air flow.
[0013]
【Example】
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings showing an embodiment. 1 is a body of a lawn mower, 2 is a housing forming the body 1, 2a is a discharge port for cut grass provided in the housing 2, 2b is an upper plate of the housing 2, 2c is It is a cylindrical motor case extending from the upper plate 2b toward the inside of the housing 2, and forms an air passage from the upper space of the upper plate 2b to the inside.
[0014]
Reference numeral 3 denotes a motor mounted in the motor case 2c; 3a, a motor shaft of the motor 3 extending downward from the housing 2; 4, a disk fixed to and rotating on the motor shaft 3a; And a casing provided surrounding the motor case 2 c. The casing 5 has a spiral flow path toward the discharge port 2 a of the housing 2.
[0015]
Reference numeral 4a denotes a plurality of blades extending radially from a motor shaft 3a provided on the disk 4, and 6 denotes a fan formed by the blades 4a provided on the disk 4. When the fan 6 rotates by the motor 3, the motor case 2c Is sucked and blown toward the side wall of the casing 5 to form an air flow along the casing 5 and reaching the discharge port 2a.
[0016]
Reference numeral 7 denotes a plurality of cutting blades provided outside the blades 4a of the disk 4, and reference numeral 8 denotes a grass-collecting bucket attached to the discharge port 2a. Is discharged from the discharge port 2a and collected in the bucket 8 by the air flow.
[0017]
Reference numeral 9 denotes a bottom plate attached to the lower surface of the housing 2. The cutting blade 7 is partially exposed on the side of the main body 1 in the traveling direction so that grass can be cut, and the discharge port 2a side is closed to allow the user to cut the grass. 7 is not touched.
[0018]
However, when air is blown by the fan 6, an airflow from the inside of the motor case 2 c to the lower part of the side wall of the casing 5 along the disk 4 is likely to be formed, and the grass cut on the airflow is blocked by the side wall of the casing 5. There is a danger that the airflow along the casing 5 toward the discharge port 2a may not be able to be achieved well and may stall, and may fall on the bottom plate 9 or fall near the discharge port 2a and the entrance of the bucket 8. was there.
[0019]
For this reason, the discharge port 2a is blocked with grass before the grass is accumulated in the bucket 8, and the operator must interrupt the operation and remove the grass that has blocked the discharge port 2a each time, which is very user-friendly. It was bad.
[0020]
On the other hand, as a countermeasure, an opening is provided between the cutting blade 7 of the bottom plate 9 and the discharge port 2a, and the cut grass falling on the bottom plate 9 is directly discharged from the opening to the ground, and the discharge port 2a is provided with the cut grass. So that the work can be continued until the grass is collected in the bucket 8.
[0021]
However, even though the work could be continued, the cut grass discharged from the opening was scattered on the ground, so that there were still problems such as a decrease in grass collection efficiency and the necessity of cleaning after the work.
[0022]
The present invention solves the above problems and improves the efficiency of grass collection. 4b is a cylindrical portion provided on the disk 4, and the cylindrical portion 4b surrounds the outside of the blade 4a and has an inner surface of the blade 4a. It has a certain height that is continuous with the blade 4a, and forms an airflow that goes upward of the housing 2 while guiding the wind generated by the blades 4a upward. For this reason, the cut grass in the vicinity of the cutting blade 7 is raised upward, so that it does not fall near the discharge port 2a.
[0023]
The upper plate 2b is provided so as to be inclined so that the side of the discharge port 2a is higher, and the upward airflow in the cylindrical portion 4b changes its direction along the upper plate 2b which is inclined in the casing 5, so that it is upward. Is smoothly directed to the discharge port 2a without largely changing the blowing direction, and the cut grass soared upward is also discharged from the discharge port 2a without stalling on this air flow. Was.
[0024]
In addition, in another embodiment shown in FIG. 3, reference numeral 4c denotes a taper provided so as to widen the opening of the inner wall surface of the cylindrical portion 4b. To form a rising air flow. For this reason, the air outside the cylindrical portion 4b is entrained, and a strong ascending airflow is formed near the cutting blade 7, so that the grass is smoothly carried upward to the discharge port 2a while riding on the airflow. It became something.
[0025]
The height of the cylindrical portion 4b and the angle of the taper 4c are set so that the grass is efficiently carried and the noise due to the blowing is not increased.
[0026]
【The invention's effect】
In the present invention, the tubular portion 4b is provided so as to surround the outer side of the blade 4a of the disk 4, and the tubular portion 4b guides the wind of the fan 6 upward to prevent the airflow flowing upward of the housing 2 from flowing. The cut grass cut by the cutting blade 7 soars upward in the air flow, so that it does not fall near the discharge port 2a, and the work can be continued until the bucket 8 is full of cut grass. It became.
[0027]
The upper plate 2b of the housing 2 is provided so as to be inclined so that the side of the discharge port 2a is higher, and the air flow upward in the cylindrical portion 4b changes its direction along the upper plate 2b which is inclined inside the casing 5. The cut grass that has flown upward is discharged from the discharge port 2a without stalling on this air flow and reaches the interior of the bucket 8 because the cut grass is smoothly moved to the discharge port 2a without largely changing the blowing direction. It means that more grass can be collected and the usability is much better.
[0028]
The inner wall surface of the cylindrical portion 4b is provided with a taper 4c that widens the opening upward to guide the wind of the fan 6 obliquely upward to form an airflow that rises along the casing 5, so that the cylindrical portion 4b The outside air is entrained and a strong ascending air flow is formed near the cutting blade 7, and the grass is smoothly carried to the discharge port 2a on this air flow, so that the grass can reach the bucket 8 reliably. It is something.
[0029]
Further, the housing 2 only needs to incline the upper plate 2b, and the motor case 2c and the casing 5 can be formed integrally with the housing 2 as in the conventional case. Similarly, the blade 4a and the cylindrical portion 4b are formed integrally with the disk 4. Since molding can be performed, it is possible to improve grass collection efficiency with little increase in cost or change in the assembling process.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a rotary lawn mower according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the rotary lawn mower according to the embodiment of FIG.
FIG. 3 is a perspective view showing parts of a rotary lawn mower according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body 2 Housing 2a Discharge port 2b Upper plate 2c Motor case 3 Motor 3a Motor shaft 4 Disk 4a Blade 4b Cylindrical part 4c Taper 5 Casing 6 Fan 7 Cutting blade

Claims (2)

A housing 2 having a discharge port 2a in a part of the main body 1,
A motor case 2c forming a cylindrical air passage extending inward from the upper plate 2b of the housing 2,
A disk 4 fixed to a motor shaft 3a of the motor 3 mounted in the motor case 2c;
A casing 5 having an inner diameter larger than the disk 4 and forming a spiral flow path to the discharge port 2a of the housing 2 while surrounding the motor case 2c;
The disk 4 is provided with a plurality of blades 4a radially extending from the motor shaft 3a to constitute a fan 6.
The blades 4a draw air from inside the motor case 2c to form an air flow reaching the discharge port 2a along the casing 5,
A plurality of cutting blades 7 for cutting grass are provided outside the blades 4a of the disk 4,
In a rotary lawn mower that discharges the cut grass cut by the cutting blade 7 from the discharge port 2c by being put on the airflow by the fan 6,
Rutotomoni provided a cylindrical portion 4b having a constant height inner surface surrounding the outer is continuous with the blade 4a of the blade 4a is a disc 4,
The inner wall surface of the cylindrical portion 4b continuous with the blade 4a is provided with a taper 4c that widens the opening upward,
The taper 4c of the cylindrical portion 4b guides the wind of the fan 6 obliquely upward,
A mowing grass discharging structure for a rotary lawn mower, wherein mowing grass is sowed by forming an airflow going upward of the housing 2 while rising along the casing 5 . The upper plate 2b of the housing 2 is provided so as to be inclined so that the discharge port 2a side is higher,
2. The mowing grass discharge of a rotary lawn mower according to claim 1, wherein the air flow directed upward by the cylindrical portion 4b changes its direction along the upper plate 2b inclined in the casing 5 and faces the discharge port 2a. Construction.

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