JP2010017117A - Lawn mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact lawn mower having an improved property for discharging mowed lawns on a lawn-mowing work. <P>SOLUTION: Provided is the lawn mower which has a handle extended in the oblique rear direction of a body and mows lawns with a rotary blade interlocked with the rotation of a motor shaft in a state that the handle is held, characterized by disposing a dust cover having a moderate slope and a steep slope above the rear wheels of the body, attaching the rear wheels on the back side of the steep slope of the dust cover in a state approaching the rotary blade so that a wheel base between the rear wheels and the front wheels is shortened, and flowing the mowed lawns from a discharging port to a lawn-collecting bag behind the body along the moderate slope of the dust cover with an air flow produced with a fan disposed between the motor and the rotary blade. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lawn mower that cuts grass.

  2. Description of the Related Art Conventionally, lawn mowers that cut grass are widely used that use an electric motor or an internal combustion engine as a drive source, and those that have a rotary blade or a reel blade as the cutting means. FIG. 5 is a diagram for explaining a general lawn mower and its usage. In FIG. 5, the lawn mower 1 is equipped with a motor 7 (not shown) as a drive source inside the housing 2, and a cutter 8 is rotatably attached to the bottom of the housing 2 by the motor 7. The housing 2 accommodates a motor, and a wheel 13, a handle 3, and a grass collection bag 16 are attached around the motor 2. When the operator holds the handle 3 extending obliquely rearward and upward of the main body 2 and turns on the main switch 5 while pressing the safety lock switch 4, electric power is supplied to the motor 7 through the power cord 6, and the motor shaft When the cutter 8 rotates in conjunction with this, and the handle is pushed in the advancing direction, the lawn mower body travels and the lawn mower can be trimmed (hereinafter, this lawn mower body In the following description, the position where the worker is located is defined as the rear, the opposite is defined as the front, and the direction perpendicular to the forward and rearward traveling directions is defined as the left-right direction. The opposite is the upper).

  In the lawn mower 1 at the time of mowing the turf, the turf grass that has entered the housing 2 as it travels forward is mowed by the rotating cutter 8, and the mowed turf grass is collected on the motor shaft 7a. It takes the fan wind b which the fan 14 produces, is carried in the wind tunnel 20 formed in the housing, and is collected in the bag 16 for grass collection attached to the discharge outlet 2a. The grass collection bag 16 in which the turfgrass is collected can be removed from the housing 2 with the handle 21 so that the turfgrass can be taken out.

  In such a lawn mower, it is necessary to place the cut turf grass on a fan wind flow and collect it in a grass collecting bag provided above the rotary blade. An inclined surface is provided.

Reality 1-167732

  In the lawn mower as described above, if the angle of the inclined surface is steep, the fan wind may collide with the inclined surface and impair the momentum. Therefore, in order to smoothly guide the cut turf grass upward Needed to make the angle of the inclined surface gentle with respect to the bottom surface. However, if the fan wind is guided to the same height as the steeply inclined surface by the gently inclined surface, problems such as enlargement of the main body due to the entire inclined part extending in the front-rear direction, an increase in mass, and lawn mowing Since the rear wheel position of the machine needs to be located behind the inclined part, in the case of the above configuration, the wheel base between the front wheel axle and the rear wheel axle is inevitably lowered by the rear wheel position being lowered. There was a problem that it became long and the handling became inconvenient.

  The present invention has been made in view of the above background, and an object of the present invention is to provide a compact lawn mower that improves the grass collection rate of the cut grass during mowing.

  Of the inventions disclosed in the present application, typical features will be described as follows.

  According to one aspect of the present invention, the present invention is achieved by having a plurality of inclined surfaces having different inclination angles near the discharge portion of the main body.

  According to the first and second aspects of the invention, the inclined portion has a plurality of inclined surfaces having different inclination angles, and the rear wheel provided on the bottom surface portion is brought closer to the position of the rotary blade by the steep slope of the inclined portion. The wheelbase can be shortened, and the gradual slope of the slope allows the cut grass to be smoothly fed from the outlet to the grass collection bag, improving the grass collection rate of the grass. Lawn mower can be provided.

  According to the invention of claim 3, a part of the end portion of the inclined portion on the rotary blade side is shaped along the rotary blade, so that the entire inclined portion in the advancing direction of the lawn mower is avoided while avoiding the rotary blade. Since it can arrange | position close to the center of a rotary blade, the full length of a lawn mower can be shortened.

  According to the invention of claim 4, on the side continuously connected to the outer wall of the main body forming the fan air blowing path, the fan wind on which the turf grass is placed is continuously inclined by making the inclination angle the smallest. While being connected to the surface, it can be gently guided upward, and the grass collection rate can be improved.

  According to the fifth aspect of the present invention, the inclination angle suddenly changes around the gently inclined surface without impairing the function as the air passage that guides the fan wind by the inclined portion having the inclined surface. It is possible to connect the inclination angle while preventing it.

  According to the invention of claim 6, since the inclined portion is configured to be detachable from the main body of the lawn mower, molding of the housing and the inclined portion is facilitated, and the assemblability of the lawn mower is improved. .

  Hereinafter, an embodiment of a lawn mower according to the present invention will be described with reference to FIGS.

  1 is a partial sectional side view of a main body according to an embodiment of the present invention, FIG. 2 is a perspective view of a dust cover, FIG. 3 is a sectional view of the dust cover, and FIG. 4 is a schematic diagram showing the relationship between the dust cover and the cutter. is there.

  The basic operation of the lawn mower is the same as that described above with reference to FIG.

  The internal structure of the lawn mower 1 will be described using the cross-sectional view shown in FIG. Inside the housing 2 of the lawn mower 1, a motor 7 is accommodated in a cylindrical motor case 2c provided on the upper plate 2b, and the motor 3 that moves from the upper space of the upper plate 2b to the inside of the housing is accommodated in the motor case 2c. An air passage for cooling is formed. The motor 7 is arranged such that the motor shaft 7a is perpendicular to the ground.

  The motor shaft 3a extends to the vicinity of the lower end of the housing, and a disk-shaped cutter 7 is attached below the motor shaft 3 so as to be rotatable in parallel with the ground. A grass collecting fan 4 is attached to the same motor shaft 3a so as to closely overlap the cutter 7.

  At the lower end sandwiched between the left and right sides of the front wheel 13a attached to the front side in the traveling direction of the housing 2, an opening for allowing turf grass to enter the housing is provided, and is opened to a position higher than the rotational surface of the cutter 7. ing. A bottom plate 17 is attached to the bottom side of the housing 2 so as to cover the discharge port 2a side of the cutter 8 when viewed from the bottom side, and a part of the cutter 8 is exposed to the traveling direction side of the main body 1. . The axle connecting the left and right sides of the front wheel 13a can be changed in the mounting position with respect to the housing 2, and the height of the rotary surface from the ground of the cutter 7 attached to the housing 2 can be changed and trimmed. It is possible to adjust the length of the turf.

  The housing 2 constitutes a wind tunnel 20 that is a space through which the airflow from the grass collecting fan 4 that has passed around the motor case 2c passes, and is connected to the discharge portion 2a to which the grass collecting bag 16 is connected. ing. The passage connected from the wind tunnel 20 to the discharge port 2a is constituted by a dust cover 11 as an inclined portion that is detachably provided at the bottom of the passage, and the upper portion of the passage is formed by a curve curved upward by the upper plate 2a. Is formed. The dust cover 11 has inclined surfaces 9, 10, and 12 that are inclined upward, and the inclination is provided so as to protrude inside the housing 2. Further, according to this inclination, the vicinity of the inclined surface is concave when viewed from the outside of the housing 2 and is provided so that a part of the wide rear wheel 13b is accommodated.

  2 and 3, the gently inclined surface 9 of the dust cover 11 is formed so as to wrap around the side of the cutter 8, and gradually increases in width in the left-right direction toward the discharge port 9 at the rear in the traveling direction. While looking upwards. The inclined surface 9 is connected to the bottom portion at a position lower than the cutter 8 at a narrow inclination start portion on the side portion side on the front side in the traveling direction, and via a connecting inclined surface 12 near the center in the left-right direction. The bottom of the wind tunnel 20 and the steep inclined surface 10b are connected.

  The connecting inclined surface 12 includes a curved surface and a plurality of surfaces having different inclination angles. The dust cover 11 is provided with an attachment hole 22 for attaching to the housing 2 with screws, bolts or the like. Above the inclined surface, a flat portion 18 is formed at a point slightly lowered by a step from the upper end of the inclined surface, and an attachment member for the grass collection bag 16 is connected thereto. Further, a protrusion 23 that supports a part of the bottom plate 17 is provided on the front side. The dust cover 11 is easily molded by integral molding, and the fan wind b generated by the grass collecting fan 14 is guided upward along the gentle inclined surface 9.

  Referring to FIG. 4, the relationship between the dust cover 11 and the cutter 8 will be described. The inclined surface end 24 of the connecting inclined surface 12 that connects the gently inclined surface 9 and the bottom surface of the dust cover 11 contacts the cutter 8. In the present embodiment, it is formed in a circular arc shape while keeping a constant interval in the radial direction of the cutter 8 along the rotation radius. In the front-rear direction of the lawn mower passing through the center of rotation of the cutter 8 and the center point of the mounting hole, the gentle inclined portion 9 and a part of the connecting inclined portion 12 are closer to the rotational center than the outermost diameter of the rotary blade. That is, the front side of the gentle inclined surface 9 and the connecting inclined surface 12 and the rear side of the cutter 8 are provided so as to overlap in the traveling direction of the lawn mower.

  The dust cover 11 is formed with an inclined surface 9 having the gentlest inclination on the side of the outer wall of the wind tunnel 20 along the direction of rotation of the grass collecting fan 14, and the grass collecting fan 14 rotating clockwise. The fan wind b sent by is guided by the outer wall of the housing 2 forming the wind tunnel 20 and rotates clockwise, and is sent to the rear side of the lawn mower 1 and then the gentle sloped surface 9 and the connecting slope. The turfgrass which passes through the discharge part 2a and is placed in the fan wind is conveyed to the grass collecting bag 16 while forming a wind that is guided by the surface 12 and spreads.

  According to such a configuration, the air passage on the side portion of the lawn mower 1 through which the fan wind b passes is formed by the gently inclined surface 9 and the central portion in the left-right direction where the distance from the cutter 8 is short. By adopting a configuration where the vicinity is a steep slope 12 and is lowered rearward from the leading edge of the gently inclined surface 9, it becomes possible to bring the entire inclined surface closer to the cutter 8, and a compact lawn mower with high grass collection rate. Can be provided.

  Further, the dust cover 11 having the inclined surfaces having a plurality of angles is provided on the rear wheel 12 of the main body 2, so that the dust cover 11 is secured while ensuring the inclination angle of the inclined surface for the fan wind guide. The rear wheel 13b and the front wheel 13a can be attached as close to the rotary blade 8 as possible so that the wheel base a of the rear wheel 13b and the front wheel 13a is as short as possible.

  Moreover, in the advancing direction of the lawn mower 1, the inclined surface and the cutter 8 are provided to overlap in the front-rear direction, so that the overall length of the main body in the advancing direction can be shortened.

  In addition, by forming the inclined surface end 24 on the cutter 8 side of the dust cover 11 along the cutter 8, the inclined surface of the dust cover 11 can be disposed close to the cutter 8.

  Further, on the side continuously connected to the outer wall of the main body housing 2 forming the wind tunnel 20 as the air passage for the fan wind b, the fan wind b on which the turf grass is placed is continuously provided by reducing the inclination angle to the minimum. While being connected to the inclined surface, it can be gently guided upward, and the grass collection rate can be improved.

  Further, since the connecting inclined surface 12 is formed of a curved inclined surface or an inclined surface having a plurality of inclination angles, the inclination angle is prevented from changing suddenly around the gentle inclined surface 9 and the fan wind b is reduced. It becomes possible to fulfill the function as a guiding air passage.

  Further, since the dust cover 11 is configured to be detachable from the housing 2, the dust cover 11 and the housing 2 can be easily molded and the lawn mower 1 can be assembled.

  The lawn mowed by the lawn mower 1 configured as described above is such that the wind b generated by the fan 14 interposed between the motor 7 and the rotary blade 8 is discharged along the gentle inclination 9 of the dust cover 11. To the grass collecting bag 16 behind the main body 2.

  In addition, although the inclined surface end 24 on the cutter 8 side of the dust cover 11 is configured in an arc shape in the embodiment, the same effect can be obtained by a polygonal shape as long as the cutter 8 is along the cutter 8.

  The dust cover 11 may be attached to the housing 2 in any way as long as it does not fall off during the work. In the present embodiment, the inclined surface is configured by the dust cover 11 that is separate from the main body housing 2, but may be configured integrally with the main body housing 2 itself, or for each inclined portion. Even if the dust cover 11 is composed of separate parts, it is possible to expect an improvement in the grass collection rate and a compact lawn mower as in the above embodiment.

As mentioned above, although demonstrated based on embodiment which shows this invention, this invention is not limited to the above-mentioned form, A various change is possible within the range which does not deviate from the meaning. For example, in the present application, a hand-driven electric lawn mower has been described. However, an internal combustion engine may be used, and a self-propelled type can be similarly applied.

It is a partial section side view of the main part concerning the embodiment of the present invention. It is a perspective view of the dust cover concerning the embodiment of the present invention. It is sectional drawing of the dust cover which concerns on embodiment of this invention. It is this schematic showing the relationship between the dust cover and cutter which concerns on embodiment of this invention. It is a figure for demonstrating a common lawn mower and its usage.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lawn mower 2 Housing 2a Discharge port 2b Upper plate 2c Motor case 3 Handle 4 Safety lock switch 5 Main switch 6 Power cord 7 Motor 7a Motor shaft 8 Rotary blade 9 Slow slope 10 Steep slope 11 Dust cover 12 Slope for connection 13a Front wheel 13b Rear wheel 14 Grass collecting fan 16 Grass collecting bag 17 Bottom plate 18 Flat portion 19 Mounting member 20 Wind tunnel 21 Handle 22 Mounting hole 23 Projection portion 24 Inclined surface end portion 30 Ground a Wheel base length b Fan wind

Claims (6)

A main body having a discharge part to which a bag for collecting grass can be connected; a drive source housed in the main body; a rotary blade that rotates in conjunction with rotation of the drive source; and a fan for collecting grass, In the lawn mower, the fan for collecting grass creates a fan wind that carries the mowing grass cut by the rotary blade to the bag for collecting grass, and is provided with an inclined portion that guides the fan wind upward near the discharge portion of the main body. ,
The lawn mower characterized in that the inclined part has a plurality of inclined surfaces having different inclination angles.   The said inclined part exists in the side near the said drive source rather than the outermost diameter of the said rotary blade in the direction which passes the rotation center of the said rotary blade, and the center point of the said discharge part. Lawn mower.   3. The lawn mower according to claim 1, wherein a part of the inclined blade side end portion of the inclined portion has a shape along the rotary blade.   The inclined portion has a smallest inclination angle on a side continuously connected to an outer wall of the main body that forms the fan air blowing path. Lawn mower as described in.   The lawn mower according to any one of claims 1 to 4, wherein the inclined part has a curved inclined surface. The lawn mower according to any one of claims 1 to 5, wherein the inclined portion is configured to be detachable from the main body.

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