JP2000041459A - Lawn grass-discharging structure of rotary type mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for improving grass-gathering efficiency of mowed grass in a rotary type mower. SOLUTION: A cylindrical motor case 2c facing to the inner direction from the upper plate of a housing 2 is used as a draft air duct. A casing 5 forming a spiral passage following a discharging opening 2a of a main body 1 is installed in the exterior of a motor case 2c. A motor 3 installed in the motor case 2c rotates a fan 6 constituted of a disk 4 having a blade 4a and a cutting blade 7 to form an air flow directing from the motor case 2c to the discharging opening 2a. The disk 4 has a cylindrical part 4b surrounding the outside of the blade 4a present at the inside of the cutting blade 7, continuing to the blade 4a at the inner surface, and having a prescribed height. The cylindrical part 4b strongly introduces the wind of the fan 6 upward, and blows up the mowed grass mowed by the cutting blade 7 to the discharging opening 2a to efficiently gather the grass in a basket.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mowing grass discharging structure for improving the efficiency of collecting grass in a rotary lawn mower.

[0002]

2. Description of the Related Art A rotary lawn mower is provided with a disk that is rotated by a motor mounted in a motor case of a housing, and a spiral casing having an inner diameter larger than that of the disk is configured to face a discharge port. Some blades provided on a plate suck air from inside the motor case and blow it 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 disc, and the grass cut by the cutting blade is put on the air stream and discharged from the discharge port.A harvesting bucket 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 air flow directed downward of the side wall of the casing is easily formed. Might be.

On the other hand, a bottom plate is attached to the lower surface of the housing so as to prevent the user from touching the cutting blade. The bottom plate is attached to the lower portion of the discharge port, and the stalled grass falls on the bottom plate without reaching the discharge port. If the drop falls near the discharge port and the entrance of the bucket and the discharge port is immediately blocked by grass, the work must be interrupted and the grass cut off near the discharge port must be removed even though the bucket is not full. Was inconvenient.

[0005]

As a countermeasure for this, an opening is provided on the way from the cutting blade of the bottom plate toward the discharge port, and the grass which stalls and falls on the bottom plate is discharged from the opening.
Some outlets are not blocked, so that work can be continued until the bucket is full.

However, if grass is discharged from the opening, the grass collecting efficiency is reduced, and even if a bucket is attached, the grass is scattered on the ground after the work, and there remains a problem to be improved.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and comprises a housing 2 having a discharge port 2a in a part of a main body 1, and a cylindrical shape directed inward from an upper plate 2b of the housing 2. A motor case 2c forming an air passage, a disk 4 fixed to a motor shaft 3a of a motor 3 mounted in the motor case 2c, an inner diameter larger than the disk 4, and a housing 2 A casing 5 having a spiral flow path leading to the discharge port 2a is provided. The disk 4 is provided with a plurality of blades 4a radially extending from a motor shaft 3a to constitute a fan 6. The blades 4a are A plurality of cutting blades 7 are provided on the outer side of the blades 4a of the disk 4 for sucking air from inside the motor case 2c to form an air flow along the casing 5 to the discharge port 2a. ,
In the rotary lawn mower in which the grass cut by the cutting blade 7 is put on the airflow of the fan 6 and discharged from the discharge port 2c, the disk 4 surrounds the outside of the blade 4a and has a constant inner surface continuous with the blade 4a. A cylindrical portion 4b having a height of
“b” guides the wind of the fan 6 upward, forms an airflow directed upward of the housing 2, and flies the grass.

The upper plate 2b of the housing 2 is
The air flow directed upward by the cylindrical portion 4b changes direction along the upper plate 2b that is inclined in the casing 5 and is directed toward the discharge port 2a, so that the air flow is stalled and the upper plate is stalled. No longer falls on 2b.

The 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. The taper 4c guides the wind of the fan 6 obliquely upward.
Since the air flow was formed so as to rise along the casing 5, the cut grass smoothly flowed toward the discharge port 2c.

[0010]

In the present invention, air is sucked from the inside of the motor case 2c by the blades 4a of the disk 4.
a, a cylindrical portion 4b is provided so as to surround the outside.
Since b guides the wind upward, an airflow directed upward of the housing 2 is formed. Therefore, disk 4
Since the grass cut by the cutting blade 7 outside the sword rises on the airflow, the grass does not fall on the bottom plate 9 or near the discharge port 2a.

The upwardly directed air flow is changed by the upper plate 2b of the housing 2 due to the cylindrical portion 4b. However, the upper plate 2b is inclined upward so that the discharge port 2a side becomes higher, so that it is directed upward. Of the upper plate 2b inclined inside the casing 5 without greatly changing the blowing direction.
The direction changes along the arrow 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.

Further, a taper 4c is provided on the inner wall surface of the cylindrical portion 4b so as 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 cylindrical portion 4b, and the grass was smoothly carried to the discharge port 2a by riding this air flow.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings showing an embodiment. The plate 2c is separated from the upper plate 2b by the housing 2
Is a cylindrical motor case extending inward, and forms an air passage going inward from the upper space of the upper plate 2b.

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 the motor shaft 3a and rotating;
Is a casing provided with an inner diameter larger than the circular plate 4 and surrounding the motor case 2c. The casing 5 has a spiral flow path toward the discharge port 2a of the housing 2.

Reference numeral 4a denotes a plurality of blades extending radially from a motor shaft 3a provided on the disk 4, and 6 denotes a blade 4 provided on the disk 4.
When the fan 6 is rotated by the motor 3, the air in the motor case 2 c is sucked and blown toward the side wall of the casing 5, and the airflow reaching the discharge port 2 a along the casing 5 is reduced. It is formed.

Reference numeral 7 denotes a plurality of cutting blades provided on the outer side of the blades 4a of the disk 4, and reference numeral 8 denotes a grass-collecting bucket mounted on the discharge port 2a. Is discharged from the discharge port 2 a by the airflow from the fan 6 and collected in the bucket 8.

Numeral 9 denotes a bottom plate attached to the lower surface of the housing 2. The cutting plate 7 is partially exposed on the side of the main body 1 in the traveling direction so that grass can be cut off. Does not touch the cutting blade 7.

However, when air is blown by the fan 6, an airflow from the inside of the motor case 2c to the lower part of the side wall of the casing 5 along the disk 4 is likely to be formed. There is a danger that the airflow may be interrupted and the air flow along the casing 5 toward the discharge port 2a may not be achieved well and may stall, and may fall on the bottom plate 9 or fall near the discharge port 2a and the inlet of the bucket 8. Or something.

For this reason, the discharge port 2a is blocked by the grass before the grass is stored in the bucket 8, and the operator has to interrupt the operation and remove the grass that has blocked the discharge port 2a each time. It was very inconvenient.

On the other hand, as a countermeasure for this, there is an apparatus in which an opening is provided between the cutting blade 7 of the bottom plate 9 and the discharge port 2a, and the grass falling on the bottom plate 9 is directly discharged from the opening to the ground.
The discharge port 2a is not blocked by the cutting grass so that the work can be continued until the cutting grass accumulates.

However, even if the operation can be continued, the cut grass discharged from the opening is scattered on the ground, so that there remain problems such as a decrease in the efficiency of collecting grass and the necessity of cleaning after the operation.

The present invention solves the above-mentioned 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. The inner surface has a certain height that is continuous with the blades 4a, and forms an airflow that goes upward of the housing 2 while guiding the wind generated by the blades 4a upward. Therefore, the cut grass near the cutting blade 7 is sowed upward, so that it does not fall near the discharge port 2a.

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 air flow in the cylindrical portion 4b changes its direction along the upper plate 2b which is inclined inside the casing 5. Therefore, the upward air flow smoothly goes 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. It became so.

In another embodiment shown in FIG.
c is a taper provided on the inner wall surface of the cylindrical portion 4b so as to widen the opening upward, and guides the wind of the fan 6 obliquely upward to form an air flow that rises along the casing 5.
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 cut grass is smoothly carried upward to the discharge port 2a while riding on the airflow. It became something.

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]

According to the present invention, the cylindrical portion 4b is provided so as to surround the outer side of the blade 4a of the disk 4, and the cylindrical portion 4b guides the wind of the fan 6 upward to raise the air above the housing 2. The grass cut by the cutting blade 7 soars upward on the airflow, so that it does not fall near the discharge port 2a until the bucket 8 is full of grass. You can continue working.

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.
The air flow directed upward at b changes direction along the upper plate 2b inclined in the casing 5, and smoothly goes to the discharge port 2a without largely changing the blowing direction. It is discharged from the discharge port 2a without stalling in the air flow and reaches the inside of the bucket 8, so that more grass can be collected and the usability is greatly improved.

The inner wall surface of the cylindrical portion 4b is provided with a taper 4c for widening the opening upward to guide the wind of the fan 6 obliquely upward to form an airflow rising along the casing 5. The air outside the shape portion 4b is entrained, and a strong rising air flow is formed near the cutting blade 7, and the cut grass rides on the air flow and is smoothly carried to the discharge port 2a, so that the cut grass reaches the bucket 8 reliably. It is what came to be.

Further, the housing 2 only needs to incline the upper plate 2b, and the motor case 2c and the casing 5 can be integrally formed with the housing 2 as in the conventional case. Similarly, the blade 4a and the cylindrical portion 4b Since it can be formed integrally with the plant, it is possible to improve the efficiency of grass collection with almost no increase in costs or changes in the assembly 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 Tubular part 4c Taper 5 Casing 6 Fan 7 Cutting blade

Claims (3)

[Claims] 1. A housing 2 having a discharge port 2a in a part of a main body 1, a motor case 2c forming a cylindrical ventilation path inward from an upper plate 2b of the housing 2, and a motor case 2c. A disk 4 fixed to the motor shaft 3a of the motor 3 mounted therein, and a casing 5 having an inner diameter larger than the disk 4 and forming a spiral flow path extending 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 form a fan 6. The blades 4a suck air from inside the motor case 2c and move along the casing 5 along the casing 5. A plurality of cutting blades 7 for cutting grass are provided outside the blades 4a of the disk 4 while forming an air flow reaching the discharge port 2a.
In a rotary lawn mower in which the grass cut by the cutting blade 7 is put on the airflow of the fan 6 and discharged from the discharge port 2c, the disc 4 has a fixed inner surface surrounding the outside of the blade 4a and continuous with the blade 4a. A cylindrical portion 4b having a height of 2 mm. The cylindrical portion 4b guides the wind of the fan 6 upward, forms an airflow directed upward of the housing 2, and flies the grass. Mowing grass discharge structure of rotary lawn mower. 2. The upper plate 2b of the housing 2 is provided so as to be inclined so that the side of the discharge port 2a becomes higher, and the upwardly directed air flow by the cylindrical portion 4b allows the upper plate 2b to be inclined inside the casing 5.
2. A mowing grass discharge structure for a rotary lawn mower according to claim 1, wherein the mowing grass is directed to the discharge port 2a while changing its direction along the line b. 3. 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 The mowing grass discharge structure for a rotary-type lawn mower according to claim 1, wherein the mowing grass is formed so as to form an airflow rising upward.