JP5712466B2 - Lawn mower - Google Patents

Description

  The present invention relates to a lawn mower for driving a rotary blade by a motor to cut grass and grass, and in particular, to obtain a better finish by making the grass cutting height uniform.

  Conventionally, a lawn mower for cutting turf is known in which a driving source is loaded on the main body, and a rotary blade provided on the bottom of the main body is rotated by the power of the driving source to cut grass and grass. . The lawn mower described in Patent Document 1 is a hand-held lawn mower that includes an electric motor as a drive source, and that is driven by an operator gripping a handle portion extending obliquely rearward from the main body and pushing it forward. By running the motor with the motor driven, the lawn is cut by the rotary blade and the fixed blade provided at the bottom of the main body, and the lawn is mowed. Also, in the lawn mowing work, in order to raise the fallen lawn and reduce the amount of uncut grass, the lawn is trimmed by comb teeth provided on the front side in the traveling direction from the rotary blade as in the lawn mower described in Patent Document 2. However, it is known to perform cutting work.

JP 59-59113 A Japanese Patent Publication No.59-25564

  However, in the lawn mower as described above, an opening for taking the lawn into the bottom of the main body is necessary in front of the lawn mower. There was a fear.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a lawn mower capable of suppressing breakage of a rotary blade with a simple and inexpensive configuration.

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

  According to one feature of the present invention, a disc-shaped rotary blade that rotates by receiving the drive of the drive source is provided at the bottom of the main body having the drive source so as to cut the lawn that has entered from the opening in front of the body. In the lawn mower configured, a comb-like member that covers the circumferential direction of the rotary blade is disposed on the front side in the traveling direction of the rotary blade.

  According to another feature of the present invention, a height adjusting mechanism that adjusts the height of the rotary blade by providing a disk-shaped rotary blade that rotates upon receiving the drive of the drive source at the bottom of the main body having the drive source. A comb-shaped member that can be adjusted in the height direction independently of the rotary blade is disposed on the front side in the traveling direction of the rotary blade.

According to the first aspect of the present invention, the disc-shaped rotary blade that rotates by receiving the drive of the drive source is provided at the bottom of the main body having the drive source, and the lawn that has entered from the opening in front of the main body is cut. In the lawn mower configured as described above, a comb-like member that covers the circumferential direction of the rotary blade is disposed on the front side in the traveling direction of the rotary blade, so that a foreign object such as a stone is less likely to contact the rotary blade. This makes it difficult for the rotary blade to break. It also has a height adjustment mechanism that adjusts the height of the rotary blade, and the comb-like member is provided so that its position can be adjusted in the height direction independently of the rotary blade. Thus, a comb-like member can be used. Further, the comb-like member has a lawn raising means having a bottom surface portion substantially parallel to the rotation plane of the rotary blade and an inclined portion inclined with respect to the rotary blade, thereby raising the fallen lawn more. This can be facilitated.

According to invention of Claim 2 , a comb-shaped member has a bottom face part substantially parallel to the rotation plane of a rotary blade, and an inclined part inclined with respect to the rotary blade, and the bottom face part and the inclined part. The region consisting of is configured to narrow toward the front in the traveling direction, and the rotary blade is positioned in the region, so that the entire surface side of the rotary blade can be reliably covered.

According to invention of Claim 3, it is arrange | positioned in the position which overlaps with a rotary blade on the same axis | shaft, The fixed blade which comprises a pair of cutting part which cut | disconnects a lawn by sliding with a rotary blade is provided. Lawn mower characterized by that. Since the grass is mowed so as to be sandwiched between the rotating blade and the fixed blade, the finish of the grass can be made more beautiful.

According to the fourth aspect of the present invention, the rotary blade is biased toward the fixed blade side and is configured to be movable in the axial direction with respect to the fixed blade. The impact can be released, and the vibration and impact can be reduced.

According to the fifth aspect of the present invention, the apparatus includes a main body cover that covers the driving source, and a position adjustment lever that operates the position of the comb-shaped member is exposed from the main body cover and is operable. It is possible to easily adjust the position.

According to the lawn mower according to claim 6 , the comb-shaped member has a uniform lawn mowing height in the width direction since the edge on the front side in the traveling direction is formed in an arc shape along the rotary blade. Can be obtained.

According to the lawn mower according to claim 7 , the comb-shaped member whose position can be adjusted in the height direction independently of the rotary blade is disposed on the front side in the moving direction of the rotary blade. Since the height of the comb-like member can be adjusted according to the state and the fallen lawn can be raised and mowed, a uniform lawn mowing height can be obtained.

The side view which concerns on embodiment of the lawn mower to which this invention is applied The bottom view which concerns on embodiment of the lawn mower to which this invention is applied The perspective view which concerns on the comb-shaped member provided in the lawn mower to which this invention is applied The top view of the state which removed the main body cover which concerns on embodiment of the lawn mower to which this invention is applied Sectional view along line XX in FIGS. 2 and 4 The conceptual diagram which shows the effect of the lawn mower to which this invention is applied

An embodiment of a lawn mower to which the present invention is applied will be described with reference to FIGS. FIG. 1 is a side view of a lawn mower 1 to which the present invention is applied, and FIG. 2 is a bottom view of the lawn mower 1 to which the present invention is applied as viewed from below. The arrows in FIG. The rotation direction of the rotary blade 22 is shown.

  In FIG. 1, the lawn mower main body 1 includes a chassis 2, a main body cover 3, and a handle portion 4. A pair of left and right wheels 7 and a roller 8 are supported on the chassis 2 in a freely rotating manner at the front bottom.

  The main body cover 3 has a hollow portion inside, is fixed to the chassis 2, and covers various parts described later disposed on the chassis 2. The handle portion 4 is provided to extend rearward of the main body cover 3 and is attached to the main body cover 3 so as to be rotatable within a predetermined range (hereinafter, the handle portion of the lawn mower main body 1 is referred to in this specification). The side where 4 is provided will be described as the rear in the direction of travel and the opposite as the front in the direction of travel). A grass collection bag 6 is provided below the handle portion 4 to accommodate the cut grass and grass. Further, from the upper surface of the main body cover, operation parts such as a trimming height adjusting lever and a lawn raising height adjusting lever which will be described later are exposed.

  The handle portion 4 is provided with a switch mechanism 5 and a power cable (not shown), and the grass bag 6 is detachably attached to the rear of the main body cover 3.

  In FIG. 2, two sets of cutting portions each including a rotary blade and a fixed blade are provided at the center bottom portion of the chassis 2, and a first rotary blade 21 and a first fixed blade 23 constituting the first cutting portion. And the 2nd rotary blade 22 and the 2nd fixed blade 24 which comprise a 2nd cutting part are each arrange | positioned in parallel in the width direction.

  The first cutting portion and the second cutting portion are provided coaxially with the first fixed shaft 17 and the second fixed shaft 18 extending from the chassis 2 side, and are fixed by the fixed blade support 25 so as to maintain a predetermined interval. Has been.

  A comb-shaped member 11 configured in a comb shape toward the traveling direction is disposed on the front side in the traveling direction of the first cutting portion and the second cutting portion. The comb-shaped member 11 covers a region corresponding to a semicircular circumference in the circumferential direction of the first rotary blade 21 and the second rotary blade 23, and further has a shape along the circumferential direction, whereby the first rotary blade 21 and the 2nd rotary blade 23 are arrange | positioned in the state maintained constant in the rotation direction.

  As shown in FIG. 3, the comb-shaped member 11 has a bottom surface portion 11a, an inclined portion 11b, and an attachment portion 11c, and is arranged such that a rotary blade and a fixed blade are positioned between the bottom surface portion 11a and the inclined portion 11b. .

  The wheel 7 and the roller 8 are provided via a link mechanism 9 that is a trimming height adjusting mechanism, and an operator operates a trimming height operation member 10 connected to the link mechanism 9 protruding from the main body cover 3. As a result, the link mechanism 9 is activated to change the heights of the wheels 7 and the rollers 8, and an arbitrary trimming height can be obtained.

  Further, the body cover 3 is provided with a comb-like member operating member 33 connected to the attachment portion 11c of the comb-like member 11, and the operator operates the comb-like member operating member 33 so that the height of the comb-like member 11 is increased. Can be set arbitrarily. Further, since the attachment portion 11c has an inclination angle substantially parallel to the inclined portion 11b, the front and rear intervals of the first rotary blade 21, the second rotary blade 23, and the inclined portion 11b vary depending on the setting of the height position. do not do.

  FIG. 4 is a plan view of the lawn mower 1 as viewed from above without the main body cover 3, and FIG. 5 is a cross-sectional view of the lawn mower 1 (cross-sectional view along XX in FIGS. 2 and 4). In FIG. 4, tooth tip circles of the first pinion 13, the second pinion 14, the first gear 15, and the second gear 16, which are rotation transmitting means, are indicated by broken lines, and the arrows indicate the rotation directions thereof. Further, in FIG. 4, the comb-like member 11 is described for explaining the position of its tip, and is actually arranged in the depth direction of the paper from each component of the rotation transmitting means.

  The motor 12 fixed to the chassis 2 includes an output shaft 12a for outputting the rotational driving force, and a first pinion 13 is fixed to the output shaft 12a. The output shaft 12 a passes through the chassis 2, and the first pinion 13 is located on the lower surface of the chassis 2.

  The first gear 15 and the second gear 16 are rotatably supported with respect to the first fixed shaft 17 and the second fixed shaft 18 fixed to the chassis 2, respectively. The first rotary blade mounting plate 19 and the second rotary blade mounting plate 20 are rotatably supported by the first fixed shaft 17 and the second fixed shaft 18, respectively, and are integrated with the first gear 15 and the second gear 16, respectively. Rotate. Further, a first rotary blade 21 and a second rotary blade 22 are fixed to the first rotary blade mounting plate 19 and the second rotary blade mounting plate 20, respectively.

  On the other hand, a first fixed blade 23 and a second fixed blade 24 are fixed to the tips of the first fixed shaft 17 and the second fixed shaft 18, respectively. The blade 22 and the second fixed blade 24 are arranged so as to be coaxially overlapped. A spring 27 is disposed between the first gear 15 and the first rotary blade mounting plate 19 and between the second gear 16 and the second rotary blade mounting plate 20 in a compressed state. The first fixed blade 23, the second rotary blade 22 and the second fixed blade 24 are always urged so as to rub against each other.

  The rotating shaft 29 to which the blower fan 28 is fixed is supported so as to be rotatable with respect to the chassis 2, and the second pinion 14 is fixed to the tip of the rotating shaft 29. The first pinion 13, the second pinion 14, the first gear 15, and the second gear 16 are located inside a gear cover 32 that is fixed to the lower surface of the chassis 2. The first gear 15 is arranged to mesh with the first pinion 13 and the second gear 16, and the second gear 16 is arranged to mesh with the first gear 15 and the second pinion 14, and the rotation of the motor 12 causes the first pinion 13 to rotate. Via the first gear 15, the second gear 16, and the second pinion 14.

  The first rotary blade 21 and the second rotary blade 22 rotate on the same rotation plane at the bottom of the main body. In front of the lawn mower main body 1 in the traveling direction, an opening 37 is opened so as to have an end thereof at a position higher than the rotation plane of the rotary blades 21 and 22, so that the lawn mower main body 1 can be easily cut. It is designed to enter the inside.

  The first rotary blade 21 and the second rotary blade 22 are covered with the comb-like member 11 on the front side in the traveling direction, and are arranged in a region defined by the inclined portion 11b and the bottom surface portion 11a. The inclined part 11b is formed so as to approach the ground toward the front, the bottom part 11a is formed in parallel with the ground, and the distance between the inclined part 11b and the bottom part 11a decreases toward the front.

  Next, the operation of the lawn mower according to this embodiment will be described. The lawn mower main body 1 of the present embodiment is connected to an external power source, the operator connects a power cable (not shown) to the external power source, and the motor 12 is driven by operating the switch mechanism 5. The two-rotating blade 22 rotates.

  Here, the operator grasps the handle portion 4 and pushes the lawn mower main body 1 so that the lawn and grass that have entered from the opening 37 in front of the main body are moved to the first rotary blade 21, the first fixed blade 23, and the second fixed blade 23. The grass is cut so that it is cut between the rotary blade 22 and the second fixed blade 24. Further, the wind generated by the rotation of the blower fan 28 is sent out from the blower port 31 provided on the lower surface of the chassis 2, and the cut grass and grass are removed. Collect in the collection bag 6.

  Next, the action of raising the turf of the comb-like member 11 will be described using a conceptual diagram. The conceptual diagram which shows typically the effect of the comb-shaped member 11 in FIG. 6 is shown. 6A is a view of the lawn mower body 1 viewed from the front, FIG. 6B is a view of the lawn mower main body 1 viewed from the side, and FIGS. 6A to 6D show the progress of the operation.

  First, it is assumed that there is a lawn that falls in a direction substantially perpendicular to the traveling direction in front of the comb-shaped member 11 in the traveling direction. In this case, when the operator grasps the handle portion 4 and pushes the lawn mower main body 1 forward, the inclined portion 11b of the comb-shaped member 11 is under the lawn 36 where the inclined portion 11b is tilted as shown in FIG. Enter. Here, the lawn mower body 1 is further pushed forward to gradually raise the lawn 36 from (b) to (c) of FIG. 6, and the lawn 36 is rotated by the rotary blade 21 (22) as shown in (d) of FIG. ) And the position of the fixed blade 23 (24), it is possible to mow in an upright state.

  The lawn 36 that has fallen to the rotary blade 21 (22) side can be raised only by being pushed in the direction of travel by the bottom surface portion 11a provided on the comb-shaped member 11, and similarly cut in an upright state. be able to.

  Thereby, the cutting height becomes uniform, and it becomes possible to obtain a better finish.

  Furthermore, when the cutting height operating member 10 is operated to increase the cutting height, the comb-shaped member 11 can be moved to a lower position by operating the comb-shaped member operating member 33. Thereby, even when the cutting height is high, the comb-like member can easily enter under the falling lawn, and the lawn can be raised and cut.

  Here, in the lawn mower main body 1, a disk-shaped rotary blade 21 (22) that rotates by receiving the drive of a drive source is provided at the bottom of the chassis 2 including the electric motor 12, and the opening 37 in front of the main body is provided. It is configured so as to cut the lawn that has entered, and the comb-like member 11 that covers the rotary blade 21 (22) along the circumferential direction is disposed on the front side in the traveling direction of the rotary blade 21 (22). This makes it difficult for the foreign matter to come into contact with the rotary blade, and damage to the rotary blade 21 (22) is less likely to occur.

  Moreover, the height adjustment mechanism 33 which adjusts the height of the rotary blade 21 (22) is provided, and the comb-shaped member 11 is provided so that position adjustment is possible independently of the rotary blade 21 (22). By this, it becomes possible to use a comb-shaped member according to the state of the turf or as necessary.

  Further, the comb-shaped member 11 includes lawn raising means having a bottom surface portion substantially parallel to the rotation plane of the rotary blade 21 (22) and an inclined portion 11b inclined with respect to the rotary blade 21 (22). This makes it easier to raise a fallen turf.

  The comb-shaped member 11 has a bottom surface portion 11a substantially parallel to the rotation plane of the rotary blade 21 (22) and an inclined portion 11b inclined with respect to the rotary blade. The region to be formed is configured to narrow toward the front in the traveling direction, and the rotary blade is positioned in the region, so that the entire surface side of the rotary blade can be reliably covered.

  Moreover, it arrange | positions in the position which overlaps with the rotary blade 21 (22) on the same axis | shaft, and comprises a pair of cutting part 21,23,22,24 which performs the cutting | disconnection operation | work of turf by sliding with the rotary blade 21 (22). Since the fixed blade is provided, the grass is trimmed so as to be sandwiched between the rotary blade 21 (22) and the fixed blade 23 (24), so that the finish of the grass can be made more beautiful.

  The rotary blade 21 (22) is urged toward the fixed blade 23 (24) and is movable in the axial direction with respect to the fixed blade 23 (24). In this case, it is possible to release the shock, and it is possible to reduce vibration and shock.

  Further, since the body cover 3 that covers the drive source 12 is provided and the position adjusting lever 33 that operates the position of the comb-like member 11 is provided so as to be exposed from the body cover and can be operated, the position can be easily adjusted. Is possible.

  Further, since the comb-shaped member 11 has an edge on the front side in the traveling direction formed in an arc shape along the rotary blade 21 (22), it is possible to obtain a uniform lawn mowing height in the width direction. Become.

  Further, a comb-like member whose position can be adjusted in the height direction independently of the rotary blade 21 (22) is disposed on the front side in the traveling direction of the rotary blade, and the height of the rotary blade 21 (22) and the state of the turf Accordingly, the height of the comb-shaped member can be adjusted, and the fallen lawn 36 can be raised and trimmed, so that a uniform lawn mowing height can be obtained.

In the present embodiment, the present invention is applied to a rotary lawn mower, but it can also be applied to other types of lawn mowers such as a rotary lawn mower. Moreover, it is preferable to use arbitrary means according to a product, such as translation and rotation, for the position adjustment of a comb-shaped member.

1. Lawn mower body Chassis 2a. Chassis mounting part 2. Body cover 4. Handle part 5. 5. Switch mechanism Collection bag 7 Wheel
8). Roller 8a. 8. Roller shaft Link mechanism 10. Cutting height operation member 11. Comb member 11a. Comb member bottom surface portion 11b. Comb member inclined portion 11c. Comb-shaped member mounting portion 12. Motor 12a. Output shaft 13. First pinion 14. Second pinion 15. First gear 16. Second gear 17. First fixed shaft 18. Second fixed shaft 19. First rotary blade mounting board 20. Second rotary blade mounting board 21. First rotary blade 22. Second rotary blade 23. First fixed blade 24. Second fixed blade 25. Fixed blade support 26. Fixed blade mounting bolt 27. Spring 28. Blower fan 29. Rotating shaft 30. Fun Hippo 31. Blower 32. Gear cover 33. Comb member operating member 34. Fixed shaft nut 35. Fan fixing nut 36. Turf

Claims (7)

Provided at the bottom of the main body having a drive source and a rotatable wheel is a disk-shaped rotary blade that can be adjusted in height with respect to the wheel and that is rotated by the drive of the drive source, and has an opening in front of the main body. A lawn mower configured to cut the lawn that has entered from the section,
On the front side in the direction of travel of the rotary blade, a comb-like member that covers the circumferential direction of the rotary blade and is configured in a comb shape toward the direction of travel is disposed.
The comb-like member, the inclined portion inclined to the traveling direction rear side is higher than the rotation plane of the rotary blade and have a, provided before and after the position in the height direction of the relative position and the traveling direction with respect to the rotary blade is variable When the relative position with respect to the rotary blade expands in the height direction, it moves to the front side in the traveling direction, and when the relative position with the rotary blade narrows in the height direction, it moves to the rear side in the traveling direction. A lawn mower characterized by that.   The comb-shaped member has a bottom surface portion that is substantially parallel to a rotation plane of the rotary blade, and an inclined portion that is inclined with respect to the rotary blade, and an area composed of the bottom surface portion and the inclined portion is: The lawn mower according to claim 1, wherein the lawn mower is configured to narrow toward the front in the traveling direction, and the rotary blade is located in the region.   The fixed blade which comprises a pair of cutting part which is arrange | positioned in the position which overlaps with the said rotary blade on the same axis | shaft, and cuts grass by sliding with the said rotary blade is provided. The lawn mower according to claim 2.   The lawn mower according to claim 3, wherein the rotary blade is biased toward the fixed blade and is movable in the axial direction with respect to the fixed blade.   5. The apparatus according to claim 1, further comprising a main body cover that covers the driving source, and a position adjustment lever that operates the position of the comb-shaped member is provided so as to be exposed from the main body cover and to be operated. The lawn mower according to any one of the above.   The lawn mower according to any one of claims 1 to 5, wherein the comb-shaped member has an arcuate edge along the rotary blade at an edge on the front side in the traveling direction. . The lawn mower is provided with a disk-shaped rotary blade that rotates upon receiving the drive of the drive source at the bottom of the main body provided with the drive source, and is provided with a height adjustment mechanism that adjusts the height of the rotary blade. And
The rotary blade has an inclined portion that is inclined forward in the traveling direction with respect to the rotational plane of the rotary blade so that the rear side in the traveling direction is higher, and independently in the height direction and the front-rear direction of the traveling direction. A lawn mower characterized in that a comb-shaped member is provided which is adjustable in position.