JP2001128527A - Lawn mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary-type lawn mower designed to smoothly collect long waste lawn hard to be collected by only a wind generated by a fan and also prevent waste lawn in a wind tunnel from clogging. SOLUTION: This lawn mower is so designed as to provide, so as to be projected upward, the upper surface of a fan 10 with projections 23 for forcedly sending out cut long waste lawn weeds toward a weed collective section 14 after catching them on.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary lawn mower. More specifically, the present invention relates to a rotary lawn mower. The present invention relates to a lawn mower adapted to prevent clogging.

[0002]

2. Description of the Related Art Conventionally, according to the invention relating to a rotary lawn mower, as shown in FIG. 16, a motor 2 'is provided inside a box-shaped lawn mower main body 1', and the cavity of the other part is changed to a wind tunnel 3 as shown in FIG. ' The wind tunnel 3 'communicates with a grass collecting section (not shown) disposed behind the lawn mower main body 1', and has an opening 8 'at the front end 1a' of the bottom surface of the lawn mower main body 1 '. Things. Disc shaped fan 1
0 ′ is connected to the motor 2 ′ via the motor shaft 2a ′,
The fan 10 ', which rotates in a horizontal plane when driven by the motor 2', is provided near the bottom surface inside the lawn mower main body. A lawn mowing blade 9 'is provided at the lower end of the fan 10' so as to face the opening 8 '. In the lawn mower having the above-described configuration, the lawn mowing blade 9 'rotating near the opening 8' cuts the lawn, and the rotated fan 10 'causes a wind flow H in the drawing. The cut grass dust was sent to the grass collection section through the wind tunnel 3 ', and the cut grass dust was collected in the grass collection section.

[0003]

However, if the cut grass is moist or long grass, the weight of the grass is heavy and the flow of the wind generated by the fan 10 'is large. In H, it may be difficult to collect in the grass collection section. In such a case, it may stick to the peripheral wall of the wind tunnel 3 'and accumulate before being collected in the grass collection section. The once-accumulated turf debris is a newly cut and entrapped turf debris that has been taken into the wind tunnel 3 ', thereby accumulating the accumulated debris.
When the accumulation of the turf dust as described above fills the wind tunnel 3 ′ so that the space leading to the grass collecting portion in the space of the wind tunnel 3 ′ is filled, the cut grass dust is completely lost. And the newly cut turf remains in the wind tunnel 3 ′, impeding the rotation of the fan 10 ′, or taking the newly cut turf into the wind tunnel 3 ′. It is something that can be scattered outside without being able to do it. An example of a means for solving this problem is to simply increase the output of the wind generated by the fan 10 '. However, according to this, it is necessary to increase the size of the device with the increase in the size of the output motor 2'. However, the noise generated by the fan 10 'and the motor 2' is large, and the adverse effects such as the problem of inconvenience to neighborhoods such as residential areas cannot be ignored.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and makes it possible to smoothly collect long turf debris, which is difficult to collect only by wind generated by a fan, and to prevent clogging of turf debris in a wind tunnel. It is an object of the present invention to provide a rotary lawn mower that prevents such a problem.

[0005]

According to a first aspect of the present invention, there is provided a lawn mower according to the present invention, wherein a wind tunnel 3 is provided inside a lawn mower main body 1 and a disk-shaped fan having blades 22 is provided. 10 is rotatably mounted on the bottom of the lawn mower main body 1 in the wind tunnel 3, and a lawn mowing blade 9 for horizontally rotating and mowing the lawn together with the fan 10 is disposed below the fan 10. In the lawn mower provided at the rear of the lawn mower main body 1 so that the grass collecting part 14 through which the lawn mowing blade 9 cuts by the wind caused by the wind is transmitted through the wind tunnel 3 communicates with the wind tunnel 3, A protrusion 23 is provided on the upper surface of the fan 10 so as to protrude upward on the upper surface of the fan 10 by hooking the turf dust and forcibly sending it to the grass collecting section 14. Grasping section 1
4 is provided on the upper surface of the fan 10 so as to protrude upward, so that the long grass cut off by the projections 23 is hooked and forcibly sent out to the grass collecting section 14, and
It is possible to prevent sticking of long turf debris on the peripheral wall of the wind tunnel 3 and clogging of the turf debris in the wind tunnel 3, and to effectively perform the grass collecting section 1 by low noise operation without increasing the air volume and the wind speed of the fan 10.
Weeding to 4

Further, a lawn mower according to claim 2 of the present invention comprises:
The fan 10 according to claim 1, wherein the height of the blades 22 is equal to or higher than the height of the blades 10 provided by the blades 22 having the protrusions 23 projecting upward from the upper surface of the fan 10.
, And provided on the outer diameter side of the blade 22 of the fan. With this arrangement, the protrusions 23 are provided so as to have a height equal to or higher than the height of the blades 10 protruding from the fan 22 on the upper surface of the fan. It can effectively prevent the clogging of turf debris in the wind tunnel. Also, by providing the projections 23 on the outer diameter side of the blades 22 of the fan,
The operation range of the projection 23 can be made large, and the clogging of turf debris in the wind tunnel 3 can be effectively prevented.

[0007] The lawn mower according to claim 3 of the present invention comprises:
According to the first aspect, the projections 23 are formed integrally with the blades 22 of the fan 10. As a result, the number of parts can be reduced, and simplicity in the manufacturing method can be expected.

[0008] A lawn mower according to claim 4 of the present invention comprises:
2. The rotation direction F of the fan 10 according to claim 1,
Is characterized by being formed in a streamlined shape. Thus, the noise of wind noise induced by the rotation of the projection 23 can be suppressed as much as possible.

[0009] A lawn mower according to claim 5 of the present invention comprises:
According to the first aspect, the projections 23 are also provided on portions other than the outer diameter side of the upper surface of the fan 10. As a result, the operating range of the projection 23 can be expanded, and the long turf debris taken into the wind tunnel 3 can be reliably hooked on the projection 23 and forcibly sent to the grass collecting section 14, and the wind tunnel 3 can be effectively made. It can prevent clogging of grass dust inside.

[0010] A lawn mower according to claim 6 of the present invention is characterized in that:
In the first aspect, a cutting blade 24 for cutting long grass waste is provided on the projection 23. This makes it possible to cut the long turf that has been cut and taken into the wind tunnel 3 into short turf, thereby reducing long turf debris that causes clogging of the turf dust in the wind tunnel 3. It is possible to effectively prevent clogging of turf debris in the wind tunnel 3.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the accompanying drawings.

FIGS. 1 to 8 show an embodiment of the present invention. As shown in FIGS. 2 and 3, a rotary lawn mower is
It is roughly composed of the lawnmower main body 1, the handle 25, and the handle 39. The handle 25 is rotatably mounted via joints 26 provided on the upper rear portion on both sides of the lawn mower main body 1. A handle portion is provided at an end of the handle 25 opposite to the lawn mower main body 1 side. 39 is fixed. A switch 40 is provided on the handle 39, and a power cord 41 extends from the switch 40.
The reference numeral 1 extends along the handle 25 and is connected to the motor 2 installed in the lawn mower main body 1.

As shown in FIG. 2, the lawn mower main body 1 has a box-like shape having wheels 6 at the front and rear ends on both sides, and is formed by a lid housing 4 and a housing 5. Things. The lid housing 4 is a housing 5
The housing 5 forms a power unit 7 and a wind tunnel 3 described below, and also forms an outer shell of the lawn mower main body 1. A power unit 7 is provided in the center of the lawn mower main body 1.
The wind tunnel 3 is formed so as to surround the periphery of the wind tunnel. The wind tunnel 3 is formed so as to increase its volume from the windward to the leeward, which is the same direction as the rotation direction F of the fan 10 described later, particularly while the ceiling is raised. Wind tunnel 3
Front end 1 of bottom plate 19 of lawn mower body 1 forming a part of
a, the bottom plate 19 having the opening 8 and facing the opening 8
Is provided with a rake-like turf take-up device 21 at the tip portion. The wind tunnel 3 also has an opening 13 at the rear part of the lawn mower main body 1, and communicates with the grass collecting part 14 detachably attached to the rear part of the lawn mower main body 1 through the opening 13. . The fact that the bottom plate 19 is provided on the lawn mower main body 1 and the opening 8 is provided at the front end of the bottom surface as described above
This is intended to protect the lawn mower body 1 or a fan 10 described later from an impact coming from unevenness of the ground.

In the power unit 7, the motor 2 is mounted on the mount 12
The motor shaft 2a extending from the motor 2 is protruded from a shaft hole formed in the housing 5 so as to protrude from the shaft hole in the wind tunnel 3 below the power unit 7. It is located in. Here, the motor shaft 2a has a D-shaped cross section, and the motor shaft 2a
A thread is formed on the surface of the.

As shown in FIG. 1, the fan 10 has a disk shape, and has a plurality of blades 2 on its upper surface.
Reference numeral 2 protrudes upward, and protrusion 23 protrudes upward. The blades 22 are arranged radially from the center over the circumference, and the protrusions 23 are １ ／ of the outer diameter side of the blades 22 on the outer diameter side.
It is arranged at a position for each rotation. The projection 23 has a height higher than that of the blade 22. Also,
The fan 10 has a thick boss 18 near the center, and the boss 18 has an axial hole 17 penetrating in the axial direction. Here, the shaft hole 17 has a D-shaped cross section having substantially the same diameter as the motor shaft 2a. Also,
A plurality of lawn mowing blades 9 are fixed to the lower surface of the fan 10 via screws 20. The lawn mowing blade 9 has a flat plate shape, has a blade at least in the rotation direction F of the tip protruding from the fan 10, and has a screw hole into which a screw 20 is inserted near the center in the longitudinal direction. is there. In the fan 10 having the above configuration, the motor shaft 2a protruding into the wind tunnel 3 is fitted into the shaft hole 17, and the spring washer 1
The screw 5 and the hexagonal nut 16 are screwed to the motor shaft 2 a, and are fixed to the motor 2 at the lower portion of the drive unit in the wind tunnel 3. At this time, the tip of the lawn mowing blade 9 fixed to the lower surface of the fan 10 is attached to the bottom plate 19 of the wind tunnel 3.
Is located at a position facing the opening 8 provided above the turf capturing device 21. Further, as described above, the motor shaft 2a and the shaft hole 17 are formed in a D-shaped cross section and fitted to each other, thereby preventing the rotation output of the motor 2 from idling at the joint portion with the fan 10 and providing the fan 10 with no loss. It can be transmitted.

As shown in FIG. 4, a thin pipe 28 is inserted into a thick pipe 27 and slid, as shown in FIG.
It has a stepless expansion and contraction mechanism that performs positioning steplessly by the positioning adjuster 29. The thick pipe 27 is rotatably connected to the lawn mower main body 1 via a joint 26, and has an adjustment hole 30 at an end opposite to the lawn mower main body 1 side, and covers the adjustment hole 30. Positioning adjuster 29
Is provided. The thin pipe 28 has a diameter smaller than the inner diameter of the thick pipe, and a stopper 31 is fixed at the end of the lawn mower main body 1 side.
The end opposite to the side is connected to the handle 39. As shown in FIG. 6, the stopper 31 is composed of a plate-like member 31a in a space between the thick pipe 27 and the thin pipe 28 and a box-like member 31b penetrating the thin pipe 28. is there. As shown in FIG. 5, the positioning adjuster 29 has a lever 32 rotatably supported via a rotary joint 33. The positioning adjuster 29 is inserted into the adjusting hole 30 of the large pipe 27 and the compression plate 34 is positioned between the lever 32 and the thin pipe 28. And, a stopper 36 having a plate-like member provided in a space between the thick pipe 27 and the thin pipe 28 is provided. Here, a rectangular column-shaped crimping material 35
Is fixed to a plate-shaped compression plate 34 with an adhesive, and a compression member 35 made of rubber or the like has a remarkably low spring coefficient as compared with the resin compression plate 34. is there. By receiving the pressing force at one point from the lever 32 by the compression plate 34 having a high spring coefficient in this manner, the pressing force is applied to the entire surface of the pressing member 35 without deformation.
Can be communicated to Further, since the stopper 36 is provided here, even if the thin pipe 28 is pulled in the direction of the handle 39, the thin pipe 28 is caught by the stopper 31. Therefore, the pulling of the thin pipe 28 in the direction of the handle 39 can be prevented. Things. The connecting portion 38 is a strength reinforcing member connected to the positioning adjuster 29 of the facing handle 25.

The positioning adjuster 2 having such a configuration
The lever 32 of No. 9 has a thickness changed around the rotary joint 33, and as shown in FIG.
By rotating the compression plate 34 and the pressure-bonding material 35 by pressing the compression force by the principle of the cam, the compression plate 34 and the pressure-bonding material 35 can be pressed.
Is strongly pressed against the thin pipe 28 and deforms and adheres to the shape of the thin pipe, thereby increasing the frictional force with the thin pipe 28 and stably holding the thin pipe 28 together with the original pressing force. The handle 25 can be extended and retracted in a stepless manner, regardless of the location of the thin pipe 28. To release the fixed state, the lever 32 may be rotated in the direction opposite to the direction in which the lever 32 is tightened, as shown in FIG.

The graph of FIG. 15 is shown for reference.
(A) shows the relationship between the amount of compression of the elastic body such as rubber used for the crimping material 35 and the pressing force, and (b) shows the crimping plate 34.
Is the relationship between the amount of compression of the resin used and the pressing force. The relationship between the amount of compression and the pressing force of the compression member 35 made of an elastic material having a lower spring coefficient and the compression plate 34 made of a resin material having a higher spring coefficient is as follows. The compression amount can be increased for a certain pressing force P (L1> L2). Since the holding force for fixing the thin pipe 28 is proportional to the product of the pressing force and the frictional force, the crimping material 35 having a low spring coefficient and capable of obtaining a large amount of compression with a small pressing force is applied to the thin pipe 28. The shape can be changed accordingly, and the contact area with the thin pipe 28 can be increased, so that the frictional force can be increased, and the holding force for fixing the thin pipe 28 with a small pressing force can be increased. Can be done. In addition, since stress relaxation that tends to occur in a resin having a high spring coefficient is also suppressed, the pressing force is not easily reduced over time. From the above, the crimping material 35 using an elastic body having a low spring constant
Is suitable for a pressure-bonded material to the thin pipe 28. In the case where the pressure-bonding material 35 is used as described above, in regard to the positioning adjuster 29, since a small pressing force may be generated, the stress applied to each component is not high, and the accuracy and strength of the component are not increased. It does not need to be so severe in terms of life and the like, and can be said to be excellent in mass productivity.

As shown in FIG. 8, the handle 39 has a switch 40 provided between a fixed grip 42 and a movable grip 43. A spring (not shown) is provided between the fixed grip 42 and the movable grip 43. The switch 40 having the above-described configuration includes the grip 4
By gripping the grips 2, 43, the switch 40 is energized to turn on the power.
When the grip is weakened, the movable grip 43 is separated from the fixed grip 42 by the above-mentioned spring, the energized state of the switch 40 is released, and the power is turned off. A power cord 41 connected to the switch 40 extends from the fixed grip 42 and is guided along the handle 25 toward the lawn mower main body 1. As described above, the power cord 41 connects the switch 40 of the handle 39 and the motor 2 inside the lawn mower main body 1, and the path is provided along one of the right and left handles 25 of the handle 25. As shown in FIG. 5, the power cord 41 is inserted and fitted into a cord fixing portion 37 provided on the handle 25 facing the positioning adjuster 29. Since the power cord 41 is provided along the handle 25 and fixed to the handle 25 in this manner, the power cord 41 does not slack. It is also preferable to fix the power cord 41 to the handle 25 more preferably on the lawn mower main body 1 side than the cord fixing portion 37, so that the handle 25 can be fixed to the lawn mower main body by the joint 26. Even when it is rotated to the upper surface side of the mower 1 and folded, it is possible to prevent the lawnmower main body 1 and the handle 25 being narrowed by the amount of folding from being caught and bitten at low cost.

In the lawn mower having the above structure, the handle 25 which is often tilted toward the lawn mower main body 1 at the time of storage is rotated and set to a position suitable for driving, and the stored length is set to the shortest length. The handle 25, which is often present, is adjusted to a position suitable for operation by using the lever 32 of the positioning adjuster 29. And the grip 42 of the handle 39,
The user operates the vehicle while holding the power switch 43 while turning on the power. When the power is turned on, the motor 2 rotates, and the fan 10 rotates via the motor shaft 2a. When the fan 10 rotates as described above, the blades 22 provided on the upper surface of the fan 10 cause wind in the wind tunnel 3 as shown in FIG. 9, and a wind flow E is generated from the opening 8 toward the opening 13. Things. Fan 10
Since a plurality of lawn mowing blades 9 are fixed to the lower surface of the blade, the lawn mowing blades 9 are also rotated. By moving the lawn mower main body 1 along the ground in such a state, the lawn mower 21 at the position facing the opening 8 stands up with the grass in contact therewith, and takes in the wind tunnel 3 from the opening 8. Since the lawn mowing blade 9 is rotated and held just above the lawn capturing device 21, the lawn mowing into the wind tunnel 3 is cut by the lawn mowing blade 9. The cut turf debris is taken into the wind tunnel 3 by the above-described wind flow E in the wind tunnel 3, and short turf debris among the turf debris is placed on the wind flow E as it is because the weight is light. From the lawn mower body 1 to the grass collecting section 14 behind the grass mower 1 to collect grass. Of the turf debris, long turf debris is relatively heavy in weight and often cannot catch the wind flow E. However, because of its large surface area, it is often caught by the rotating projections 23 on the upper surface of the fan 10 and forcibly. It is sent out and discharged from the opening 13 to the grass collecting section 14.
As described in the description of the related art, when there is no projection 23, as shown in FIG. 10, the turf dust accumulates in the wind tunnel 3 to generate the turf dust accumulation G, and further synergistically. Will be large enough to close the wind tunnel 3,
In the case where the projections 23 are provided, at least in the operation range of the projections 23, the lawn dust accumulation G is forcibly removed by the rotating projections 23, and is not promoted.

As another example of the embodiment, as shown in FIG. 11, a protrusion 23 protruding from the upper surface of the fan 10 is provided.
Similarly, it is also preferable to integrally form the blades 22 provided on the upper surface of the fan 10 so as to protrude therefrom. In the present embodiment, a protrusion 23 is provided at the end of the blade 22 on the outer diameter side of the fan 10. By doing so, it is possible to reduce the number of work steps and the number of parts for fixing the projection 23 to the fan 10 when manufacturing the fan 10, and to simplify the manufacturing method.

As another example of the embodiment, as shown in FIG. 12, it is preferable that the projections 23 are formed in a streamlined shape in the rotation direction F and provided on the upper surface of the fan 10. When the fan 10 rotates, the projection 23 has a shape that cuts off the air unlike the blade 22, so that a wind noise is generated.
By forming the projections in a streamlined manner, the resistance to the air can be reduced, the generation of wind noise can be suppressed as much as possible, and the noise generated by the lawn mower can be reduced.

As another example of the embodiment, as shown in FIG. 13, it is preferable that the projections 23 are provided not only on the outer diameter side of the upper surface of the fan 10 but also in the center direction thereof. By doing so, the operating range of the projection 23 can be expanded, and the long turf debris taken into the wind tunnel 3 can be reliably hooked on the projection 23, and can be forcibly sent out to the grass collection unit 14. Thus, the clogging of the turf debris in the wind tunnel 3 can be effectively prevented.

Further, as another example of the embodiment, as shown in FIG. 14, it is preferable to provide a cutting blade 24 for cutting long grass dust on the projection 23. In this manner, the long turf debris cut and taken into the wind tunnel 3 can be cut into short turf debris, and the long turf debris causing the clogging of the turf debris in the wind tunnel 3 can be reduced. It is possible to effectively reduce the amount of turf dust in the wind tunnel 3.

[0025]

As described above, in the lawn mower according to the first aspect of the present invention, a wind tunnel is provided inside the lawn mower main body, and a disk-shaped fan having blades is provided in the lawn mower in the wind tunnel. A lawn mowing blade, which is rotatably mounted on the bottom of the main body and is driven to rotate horizontally together with the fan and mows the grass, is arranged at the bottom of the fan,
In the lawn mower provided at the rear of the lawn mower main body so that the grass collecting portion through which the lawn mowing by the lawn mowing blade is sent through the wind tunnel by the wind generated by the fan blades communicates with the wind tunnel, the long lawn mowing cut off The projections are provided so as to protrude upward on the upper surface of the fan, so that the turf cut by the projections is hooked and forcibly sent out to the grass collection section. It can prevent the sticking of long turf debris on the surrounding wall and the clogging of turf debris in the wind tunnel, and can effectively collect grass in the grass collection section with low noise operation without increasing the fan volume and wind speed output. is there.

Further, the lawn mower according to claim 2 of the present invention,
In addition to the effect of claim 1, since the projection is provided from the fan so as to have a height equal to or higher than the height of the blade provided on the upper surface of the fan, the blade is cut off. Long turf dust is easily caught and can effectively prevent clogging of turf dust in the wind tunnel.Because it is provided on the outer diameter side than the fan blade, it is necessary to provide a large operating range of the protrusion It is possible to effectively prevent clogging of turf debris in the wind tunnel.

According to a third aspect of the present invention, there is provided a lawn mower,
In addition to the effect of claim 1, since the projection is formed integrally with the blade of the fan, the number of parts and the number of steps for fixing the projection to the fan when manufacturing the fan can be reduced, and the manufacturing method can be simplified. It can be expected.

The lawn mower according to claim 4 of the present invention comprises:
In addition to the effect of claim 1, since the projections are formed in a streamlined manner with respect to the rotation direction of the fan, the resistance to air can be reduced, and the noise of wind noise induced by the rotation of the projections is minimized. It can be suppressed.

The lawn mower according to claim 5 of the present invention is
In addition to the effect of claim 1, since the projections are also protruded at portions other than the outer diameter side of the upper surface of the fan, the operating range of the projections can be expanded, and long grass dust taken in the wind tunnel can be reduced. It can be reliably hooked onto the protrusion and forcedly sent to the grass collection section, and can effectively prevent clogging of turf debris in the wind tunnel.

The lawn mower according to claim 6 of the present invention comprises:
In addition to the effect of claim 1, the cutting blade for cutting long turf waste is provided on the projection, so that long turf waste cut and taken into the wind tunnel can be cut into short turf waste. Long turf debris, which is the cause of clogging of turf debris, can be reduced, and clogging of turf debris in the wind tunnel can be effectively prevented.

[Brief description of the drawings]

1A and 1B show a fan according to an embodiment of the present invention, in which FIG. 1A is a top view, FIG. 1B is a side sectional view, and FIG. 1C is an AA sectional view. .

FIG. 2 is a side sectional view showing the same lawnmower main body.

FIG. 3 is a side view showing a handle and a handle of the above.

FIG. 4 is a partial side sectional view showing a fixed state of the handle.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a sectional view taken along line CC of FIG. 4;

FIG. 7 is a partial cross-sectional view showing an unlocked state of the handle.

FIG. 8 is a front view showing the handle and the handle of the above.

FIGS. 9A and 9B are explanatory views showing the flow of wind generated by the blades of the fan of the lawn mower main body, in which FIG. 9A is a side sectional view and FIG. 9B is a top sectional view.

FIGS. 10A and 10B are explanatory views showing accumulation of turf debris in the wind tunnel when the fan has no protrusion, and FIG.
(B) is a top cross-sectional view, and (c) is a front cross-sectional view along DD in (a).

11A and 11B show a fan according to another example of the embodiment of the present invention, wherein FIG. 11A is a top view and FIG. 11B is a side sectional view.

FIGS. 12A and 12B show a fan according to another embodiment of the present invention, wherein FIG. 12A is a top view, FIG. 12B is a side sectional view, and FIG. 12C is a partial side view.

FIGS. 13A and 13B show a fan according to another example of the embodiment of the present invention, wherein FIG. 13A is a top view and FIG. 13B is a side sectional view.

14A and 14B show a fan equipped with a lawn mowing blade according to another embodiment of the present invention, wherein FIG. 14A is a top view,
(B) is a side sectional view.

FIG. 15 is a graph showing a relationship between a pressing force and a compression amount with respect to a holding force required for fixing the handle according to the embodiment of the present invention, wherein (a) is a graph for an elastic body;
(B) is a graph in the case of resin.

FIG. 16 is a side sectional view of a lawnmower main body, showing an example of the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lawn mower main body 2 Motor 3 Wind tunnel 9 Lawn mowing blade 10 Fan 14 Grass collecting part 22 Blade 23 Projection

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hidesumi Okamura 1048 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. (72) Inventor Masamichi Nakamura 1048 Kadoma Kadoma, Kadoma City, Osaka Matsushita Electric Works, Ltd. (72) Inventor Norio Sawada 1048 Kadoma, Kadoma, Osaka Pref.Matsushita Electric Works, Ltd. 1048, Kadoma, Kamon, Fumonma-shi F-term in Matsushita Electric Works, Ltd. (reference) 2B083 AA02 BA03 BA18 CA09 CA27 DA03 FA06 FA09 FA16 FA18

Claims (6)

[Claims] 1. A wind tunnel is provided inside a lawn mower main body, and a disk-shaped fan having blades is rotatably mounted on the bottom of the lawn mower main body in the wind tunnel, and is horizontally driven to rotate together with the fan. Arrange the lawn mowing blade at the bottom of the fan to cut the lawn,
In the lawn mower provided behind the body of the lawn mower such that the grass collected by the lawn mowing blade is sent through the wind tunnel by the wind generated by the blades of the fan, the cut lawn mower is provided. A lawn mower characterized in that a protrusion for hooking debris and forcibly sending it to a grass collecting section is provided so as to project upward on an upper surface of a fan. 2. A projection protruding from the fan so as to have a height equal to or higher than a height of a blade of a blade protruding upward from the upper surface of the fan, and a projection outside the blade of the fan. The lawn mower according to claim 1, wherein the lawn mower is provided on a radial side. 3. The lawn mower according to claim 1, wherein the projection is formed integrally with the blade of the fan. 4. The lawn mower according to claim 1, wherein the projections are formed in a streamlined manner with respect to the rotation direction of the fan. 5. The lawn mower according to claim 1, wherein the projection is also provided on a portion other than the outer diameter side of the upper surface of the fan. 6. The lawn mower according to claim 1, wherein a cutting blade for cutting long grass waste is provided on the projection.