JP2014128218A - Manual lawn mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manual lawn mower which easily changes mowing heights of a lawn with a handle part and thus can reduce labor required by mowing operation.SOLUTION: A manual lawn mower includes: wheels 4 provided at right and left positions of a lawn mower body 2; a rotary blade 6 placed horizontally between the wheels 4; a fixed blade 13 which is provided in the lawn mower body 2 and mows the lawn between itself and the rotary blade 6; a rear part roller 12 provided at a rear part of a lifting arm 11 whose front part is pivoted by the lawn mower body 2; a mowing height adjustment mechanism 20 for adjusting the mowing height of the lawn by the fixed blade 13 and the rotary blade 6 by adjusting the height of the rear part roller 12; and a handle 10 provided in the lawn mower body 2. The mowing height adjustment mechanism 20 has a lifting guide plate 23 changing height positions of the rear part roller 12 by oscillating the rear part of the lifting arm 11. The handle 10 has an operation lever part 40 which rotates the lifting guide plate 23 with an operation cable 27 and adjusts the height of the rear part roller 12 with the lifting arm 11.

Description

  The present invention relates to a manual lawn mower used for mowing lawns in homes, schoolyards, parks, and the like.

  Conventionally, in order to mow the lawn in homes, schoolyards, parks, etc., a rotary blade that rotates around a rotary shaft arranged in the lateral direction of the lawn mower body and a lawn mower body that is in contact with the rotary blade are provided. Manual lawn mowers that mow lawn between fixed blades are used. This manual lawn mower is also called a reel-type lawn mower, and is configured to rotate the rotary blade with the rotational force of the wheels provided on both sides of the lawn mower main body and mow the lawn with the fixed blade. .

  FIG. 6 shows a manual lawn mower as an example of this type of prior art. In this manual lawn mower 101, an operator has a handle 115 provided on the lawn mower main body 102, and pushes the lawn mower main body 102 forward on the lawn m so that wheels 104 having tires 103 provided on both sides are provided. The grass m mowed between the rotary blade and the fixed blade by the rotation of the wheel 104 is collected in the front grass collector 116 (see Patent Document 1). The manual lawn mower 101 is provided with an elevating guide 105 from the lawn mower body 102 toward the rear, and the height of the rear roller 106 provided at the rear of the elevating guide 105 is changed to change the cutting height. The height can be adjusted. The cutting height is adjusted according to the height of the lawn to be cut. This height adjustment includes a screwing method, a method of inserting a pin into the notch, and the like, but the lawn mowing height does not fluctuate even if the pushing load during lawn mowing changes.

  7 is a cross-sectional view in side view showing an example of adjusting the driving mechanism and the cutting height in the manual lawn mower shown in FIG. 6, where (a) is a state in which the cutting height is increased, and (b) is a state in which (b) is The state where the cutting height is lowered is shown.

  As shown in the figure, as a driving mechanism for mowing the lawn m, by rotating the tire 103, an internal gear 107 provided in the tire 103 rotates a pinion 108 provided in the wheel 104. The rotating shaft 109 is rotated integrally with the pinion 108. The rotary shaft 109 rotates the rotary blade 110 that is integrally fixed, and the rotary blade 110 cuts the lawn m with the fixed blade 111 provided on the lawn mower body 102.

  In the manual lawn mower 101, as shown in FIGS. 7A and 7B, the height of the rear roller 106 provided at the rear part of the lifting guide 105 is changed so that the lawn m The cutting height H can be adjusted. In adjusting the cutting height H, the operator lowers the posture, swings the lifting guide 105 around the support shaft 112, and the lifting guide 105 is provided with an adjustment tool 113 provided on the lawn mower body 102. The adjustment recess 114 is locked at a desired position.

Utility Model Registration No. 3130812

  By the way, the lawn m to be mowed by the manual lawn mower 101 does not grow evenly depending on the number of days to be mowed. It is desirable to cut the stretched lawn and dense lawn, for example, by adjusting the cutting height a few times and gradually lowering the cutting height from a high position.

  On the other hand, the force to mow the lawn m is a force that pushes the lawn mower 101 and rotates the rotary blade 110 with the wheels 104, and the load that pushes the lawn mower 101 when mowing a place where the lawn m extends long or densely. (Load for pushing the handle) also increases, and conversely, when mowing a place where the growth of the lawn m is poor or a place where the density is rough, the load pushing the lawn mower 101 becomes light. Thus, the load that pushes the manual lawnmower 101 during lawn mowing tends to always change. For this reason, when the lawn m is long, usually several tens of millimeters are cut by one cutting, and then the cutting height is lowered stepwise multiple times (for example, three times). Therefore, it is necessary to cut to a desired height.

  However, in the case of the above-mentioned Patent Document 1, in order to reduce the cutting height H stepwise as described above, the posture is lowered from the standing posture of the lawn mowing work and provided at the rear portion of the lawn mower body 102. The elevating guide 105 is swung so that the adjusting tool 113 needs to be locked to the adjusting recess 114 at a position where the rear roller 106 is at a desired height, which has a physical burden and requires labor. Leading to a decline.

  Therefore, depending on the worker, even when mowing long stretched lawn or dense lawn, the actual situation is not to adjust the cutting height of lawn m. is there.

  However, if you try to mow long stretched lawns or dense lawns at once, not only will the load to push the manual lawn mower increase, but the mowing lawn will bite between the fixed blade and the rotary blade, 110 may not turn. In this case, after removing the lawn bitten between the rotary blade 110 and the fixed blade 111, the mowing height must be increased to perform the lawn mowing operation again. Therefore, time and labor are required.

  Further, even when the lawn is not bitten, there are cases where the grass is cut unevenly (the length of the lawn) or when the lawn is forced to cut in a state where the lawn is bitten, the lawn is turned badly.

  Furthermore, in recent years, elementary and senior citizens sometimes mow lawns planted by tree planting, and as described above, it may be difficult to adjust the cutting height by lowering the posture and requiring labor.

  Therefore, an object of the present invention is to provide a manual lawn mower that can easily change the cutting height of a lawn with a handle portion to reduce labor required for the lawn mowing work.

  In order to achieve the above-mentioned object, the present invention provides a wheel provided between right and left positions of a lawn mower main body, a rotary blade arranged in a lateral direction between the wheels, and a rotary blade provided in the lawn mower main body. A fixed blade for mowing the lawn, a rear roller provided at the rear of a lifting arm whose front is pivotally supported by the lawn mower body, and the fixed blade and the rotary blade by adjusting the height of the rear roller A cutting height adjusting mechanism that adjusts the cutting height of the lawn by the lawn mower, and a handle provided on the lawn mower body, wherein the cutting height adjusting mechanism swings a rear portion of the lifting arm and moves the rear roller The handle includes an operation lever portion that rotates the elevation guide plate with an operation member and adjusts the height of the rear roller by the elevation arm. .

  With this configuration, the height of the rear roller can be changed by operating the operating lever portion provided on the handle and rotating the lifting guide plate by the operating member to swing the lifting arm. By changing the height of the rear roller, it is possible to change the cutting height of the lawn by the fixed blade and the rotary blade. Thus, the cutting height can be easily changed by operating the operation lever portion provided on the handle.

  Further, the cutting height adjusting mechanism is formed on the lifting guide plate whose upper part is pivotally supported by a guide plate support shaft on the lawn mower body, the lifting guide shaft provided on the lifting arm, and the lifting guide plate And a guide groove that engages with the lift guide shaft to change the height position of the rear roller, and the handle rotates the lift guide plate to engage with the guide groove. You may have the said operation lever part which changes the height of the said rear roller by changing the position of a guide shaft.

  With this configuration, by operating the operating lever portion provided on the handle to rotate the lifting guide plate, the position of the lifting guide shaft that engages with the guide groove provided on the lifting guide plate can be changed. By changing the position of the guide shaft, the lift arm provided with the lift guide shaft can be swung, and the height of the rear roller provided on the lift arm can be changed.

  In addition, the guide groove has a plurality of setting portions that keep a distance from the guide plate support shaft of the lift guide plate to the lift guide shaft at a predetermined distance, and the setting portion extends from the center of the guide plate support shaft. The distance may be set so as to increase in order from one side.

  If comprised in this way, if a raising / lowering guide plate is rotated centering | focusing on a guide plate support shaft and a raising / lowering guide shaft is located in the setting part provided in the guide groove of this raising / lowering guide plate, the center of a guide plate support shaft will be provided. The cutting height can be changed in order according to the distance from the lift to the lifting guide shaft.

  The setting portion may be formed of a linear groove portion orthogonal to a straight line extending from the center of the guide plate support shaft.

  If comprised in this way, in the state where a raising / lowering guide shaft is located in the linear groove part of a setting part, it can be set as the structure which does not raise / lower even if a raising / lowering guide plate is rotated within the range of the straight line of the groove part. Moreover, even if a large or small load that pushes the lawn mower acts during lawn mowing work due to the linear groove provided in a certain range, the load acting on the lifting guide shaft is Therefore, the lifting guide shaft does not move and the cutting height does not change.

  In addition, the operation member includes an operation cable, the guide plate support shaft includes a rotation member that connects the operation cable that rotates the lift guide plate, and the rotation member guides the operation cable to the guide. You may have the cable guide part guided by the concentric circle centering on a board support shaft.

  With this configuration, since the lifting guide plate always rotates in an arc centered on the guide plate support shaft, the stroke of the operation cable when changing the cutting height can be made constant, and the force that rotates the lifting guide plate Can always be constant.

  The rotating member includes a spring member that urges the operation cable in a direction opposite to the operation lever portion, and the operation lever portion is positioned when the elevating guide shaft is positioned at the setting portion of the guide groove. You may have the lever latching | locking part which supports the urging | biasing force of the said spring member.

  If comprised in this way, since the operation cable is urged | biased by the urging | biasing force of a spring member in the non-operation lever part direction, when pulling an operation lever, it is moved by human power so that it may oppose the urging | biasing force of a spring member, and an operation lever When returning, it can be easily moved by the urging force of the spring member, and the cutting height can be easily changed. In addition, by locking the lever to the lever locking portion provided in the operation lever portion, the biasing force of the spring member is supported in a state where the lifting guide shaft is positioned in the setting portion of the guide groove, and a predetermined cutting height is obtained. Can keep.

  According to the present invention, it is possible to adjust the cutting height of the lawn with the operation lever portion provided on the handle. Accordingly, it is possible to perform a smooth lawn mowing work by changing the cutting height at the handle portion during the lawn mowing work.

FIG. 1 is an overall perspective view showing a manual lawn mower according to an embodiment of the present invention. FIG. 2 is a side view showing the main part of the manual lawn mower shown in FIG. FIG. 3 is a plan view of an operation lever portion of the manual lawn mower shown in FIG. FIG. 4 is a side view of the lifting guide plate shown in FIG. 5 (a) to 5 (c) are side views showing the flow of adjusting the cutting height of the manual lawn mower shown in FIG. FIG. 6 is an overall perspective view showing an example of a general manual lawn mower used conventionally. FIG. 7 is a side view of the main configuration of the lawn mower shown in FIG. 5 and an example of cutting height adjustment. (A) is a sectional view with the cutting height increased, and (b) is the cutting height. It is sectional drawing of the state which made the height low.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The concept of the front / rear / left / right direction in the document of this specification and claims shall be the same as the concept of the front / rear / left / right direction in the state of operating the manual lawn mower 1 shown in FIG.

  As shown in FIG. 1, the manual lawn mower 1 is provided with wheels 4 having tires 3 on both sides of the lawn mower body 2. The wheel 4 is supported by the lawn mower main body 2 in a rotatable state. The lawn mower body 2 is provided with a rotary shaft 5 in the lateral direction, and a rotary blade 6 fixed to the rotary shaft 5 is provided so as to rotate integrally. The rotary blade 6 is configured as a reel, and a plurality of blade materials 7 twisted in a predetermined direction are fixed around a plurality of fixed plates 8 provided on the rotary shaft 5. The lawn mower body 2 is provided with a grass collector 9 at the front and a handle 10 extending upward at the rear.

  Further, a lifting arm 11 is provided at the rear of the lawn mower main body 2 toward the rear, and a rear roller 12 is provided at the rear of the lifting arm 11. The height of the rear roller 12 can be changed by swinging the elevating arm 11 by a cutting height adjusting mechanism 20 provided at the rear portion of the lawn mower body 2. By changing the height of the rear roller 12, the cutting height of the lawn can be changed.

  The cutting height adjusting mechanism 20 is configured such that the height can be adjusted by an operating lever portion 40 provided on the handle 10.

  Next, the height adjusting mechanism 20 and the like will be described in detail with reference to FIG. In the figure, the front wheel 4 is removed.

  As shown in the figure, both ends of the rotating shaft 5 are located inside the wheel 4 and are rotated by a pinion gear 17 that meshes with an internal gear 16 provided inside the wheel 4. When the wheel 4 rotates, the internal gear 16 rotates the pinion gear 17, and the rotary blade 6 is rotated integrally with the rotary shaft 5 by the pinion gear 17. The rotary blade 6 cuts the lawn with the fixed blade 13 provided on the lawn mower body 2.

  Further, the lifting arm 11 provided at the rear portion of the lawn mower body 2 is configured such that the rear portion swings in the vertical direction around the arm support shaft 14 provided at the lawn mower body 2. The rear roller 12 provided at the rear end of the lift arm 11 is rotatably supported by a roller shaft 15 provided on the lift arm 11.

  The cutting height adjusting mechanism 20 is provided at a portion where the lifting arm 11 is provided. The cutting height adjusting mechanism 20 changes the height of the rear roller 12 provided at the rear by swinging the elevating arm 11, and the cutting height H of the lawn by the fixed blade 13 and the rotary blade 6. (FIG. 2) can be changed. The lift arm 11 is provided with a lift guide shaft 21 at an upper intermediate position in the length direction.

  On the other hand, a guide plate support shaft 22 is supported on the lawn mower body 2, and a lift guide plate 23 is provided on the guide plate support shaft 22. The lifting guide plate 23 is fixed to the guide plate support shaft 22 and is rotated integrally. A guide groove 24 is provided in the lift guide plate 23, and the lift guide shaft 21 is inserted into and engaged with the guide groove 24. Therefore, the lifting guide shaft 21 moves along the guide groove 24 by rotating the lifting guide plate 23 around the guide plate support shaft 22. The guide groove 24 is formed so as to change the distance between the guide plate support shaft 22 and the lift guide shaft 21 stepwise, and the lift guide shaft 21 moves along the guide groove 24 to thereby guide the guide plate. The distance between the support shaft 22 and the lifting guide shaft 21 changes. Details of changing the distance between the guide plate support shaft 22 and the lift guide shaft 21 will be described later.

  A cable holder 25 as a rotating member is fixed to one end (front side in the figure) of the guide plate support shaft 22 that rotates the lifting guide plate 23, and the guide plate support shaft 22 is integrated with the cable holder 25. Can be rotated. By rotating the cable holder 25, the elevation guide plate 23 can be rotated integrally with the guide plate support shaft 22. The cable holder 25 is formed in a substantially L shape in a side view, and the other portion is formed in an arc-shaped portion 26 centering on the guide plate support shaft 22 with respect to the portion fixed to the guide plate support shaft 22. Has been.

  An operation cable 27 as an operation member is provided on the arc-shaped portion 26 of the cable holder 25. By providing the operation cable 27 along the arcuate portion 26, even if the operation cable 27 is pulled and the angle of the cable holder 25 changes, the cutting height does not change. Further, by making the distance that the cable holder 25 is rotated by the operation cable 27 substantially the same, a change in the force for operating the operation cable 27 is also suppressed. In this embodiment, the operation cable 27 is used as the operation member, but a configuration like an operation rod may be used.

  In FIG. 2, the cable holder 25, the lawn mower main body 2, the lifting arm 11, and the lifting guide plate 23 are provided from the front.

  Further, the guide plate support shaft 22 is provided with a biasing spring 28 that biases the lifting guide plate 23 in a direction to pull the operation cable 27 from the handle side toward the lawn mower body side. The urging spring 28 is a torsion coil spring, and the operation cable 27 is always pulled toward the lawn mower body.

  The operation cable 27 is protected by a cable outer 30 between a bracket 29 provided on the lawn mower body 2 and an operation lever part 40 provided on the handle 10.

  The operation lever part 40 is provided with an operation lever 42 supported by a lever support shaft 41. The operation lever 42 can be moved in the front-rear direction at a predetermined angle.

  As shown in FIG. 3, the operation lever portion 40 is provided with a lever locking portion 43 on the side surface of the portion where the operation lever 42 is moved. The lever locking portion 43 allows the operation lever 42 to be locked at a predetermined angle. The force that is locked by the lever locking portion 43 is the spring force of the urging spring 28 that pulls the operation cable 27 toward the lawn mower body. In this embodiment, since the height of the rear roller 12 can be adjusted in four steps by the lifting guide plate 23, the operation lever 42 for rotating the lifting guide plate 23 can also be locked at four positions. Yes. For example, these four places are adapted to be locked at positions where the cutting height H is changed to 10 mm, 15 mm, 20 mm, and 25 mm.

  As shown in FIG. 4, the guide groove 24 provided in the lifting guide plate 23 includes arcuate inclined grooves B <b> 1 to B <b> 3 and linear groove portions A <b> 1 to A <b> 1 whose distance from the center of the guide plate support shaft 22 increases in order from one side. A4 is provided. In this embodiment, the cutting height can be changed in four stages, and four linear groove portions A1 to A4 are provided.

  Thus, by providing linear groove part A1-A4, it is set as the structure which hold | maintains the grass cutting height H in each step. That is, the range in which the cutting height H is kept from the raising / lowering operation of the guide groove 24 (constant slope) provided on the lifting guide plate 23 is orthogonal to the straight line 31 extending from the center of the guide plate support shaft 22. Since the straight groove portions A1 to A4 of the parallel grooves are provided, even if a large or small load is applied to push the lawn mower 1 during lawn mowing work, it acts on the lifting guide shaft 21 positioned in the straight groove portions A1 and A4. The load is received by the linear groove portions A1 to A4 orthogonal to the guide plate support shaft 22, and the lifting guide shaft 21 does not move and the cutting height H does not change. Thus, by providing the straight groove portions A1 to A4 in the lifting guide plate 23, the force in the direction of rotating the lifting guide plate 23 within the range of the straight groove portions A1 to A4 even if a load during lawn mowing acts. The structure does not work.

  Specifically, for example, when lawn m is bitten between the rotary blade 6 and the fixed blade 13 during lawn mowing, a load of about 200 N is applied to the grip portion of the handle 10, and 80 N is applied to the lifting guide plate 23. A reaction force of ˜90 N acts. However, as described above, since the linear groove portions A1 to A4 orthogonal to the straight line 31 extending from the center of the guide plate support shaft 22 are provided in a certain range, the operation cable 27 is applied by the load pushed during lawn mowing. The structure is such that there is no change in load and no change in cutting height H occurs.

  In this embodiment, the straight groove portions A1 and A4 at both ends have short straight groove portions, and the straight groove portions A2 and A3 provided between them have long straight groove portions. In the straight groove portions A2 and A3, the lifting guide shaft 21 moves in both directions, so that it is longer than both end portions. By providing the linear grooves A1 to A4 having a predetermined length in this way, the range of the straight line does not change the cutting height H even when the guide plate support shaft 22 is rotated. The change in the cutting height H does not occur due to the above. Further, the linear groove portions A1 to A4 can also prevent the cutting height H from being changed due to play or distortion of the operation cable 27 and the cable outer 30 due to the magnitude of the pushing load during lawn mowing.

  Furthermore, between the linear groove parts A1 to A4 of the guide groove 24, arc-shaped inclined grooves B1 to B3 are formed so as to smoothly connect these linear groove parts A1 to A4. The arcuate inclined grooves B1 to B3 have a steep angle with respect to the arcuate inclined groove B1, and are gradually looser with the arcuate inclined grooves B2 and B3. This is because the rising amount of the rear roller 12 increases as the angle of the elevating arm 11 increases, so that the increase in the cutting height H becomes equal.

  Thus, according to the manual lawn mower 1 described above, at each cutting height H, in order to maintain the cutting height H corresponding to the magnitude of the pushing load at the time of lawn cutting, for example, to the target cutting height. After the operation cable 27 is pulled / returned, the handle 10 can be attached to the handle 10 without requiring a complicated structure in which a rod or pin is inserted and fixed in the hole or notch to maintain the cutting height at each stage. Even when only the operation lever portion 40 provided is operated, a change in the load applied to the operation cable 27 due to the magnitude of the load pushing the manual lawn mower 1 during lawn mowing is suppressed, and the cutting height H of the lawn m does not change. .

  Next, an example of adjusting the cutting height H by the cutting height adjusting mechanism 20 will be described with reference to FIGS. 5 (a) to 5 (c). Also in this figure, description will be given with the front wheel 4 removed. The state shown in FIG. 5A is a state in which the rear roller 12 is made the lowest with the lifting guide plate 23. In this state, the lifting guide shaft 21 is positioned in the lowest linear groove A1 (FIG. 4) of the guiding groove 24 provided in the lifting guide plate 23. The cutting height at this time is H1.

  From this state, the operation lever 42 provided on the handle 10 is detached from the lever locking portion 43 and tilted forward, and the operation cable 27 is pulled.

  As shown in FIG. 5B, the operation cable 27 is pulled by tilting the operation lever 42 toward the front as described above, and the elevation guide plate 23 is rotated integrally with the cable holder 25. The rotation of the lifting guide plate 23 changes the distance of the lifting guide shaft 21 engaged with the guide groove 24 from the guide plate support shaft 22. As a result, the lifting / lowering arm 11 with the lifting / lowering guiding shaft 21 locked on the upper part swings around the arm support shaft 14, and the rear roller 12 can be moved downward.

  Then, as shown in FIG. 5 (c), when the operation lever 42 is positioned on the side of the second lever locking portion 43 provided on the operation lever portion 40 (FIG. 2), it is rotated by the operation cable 27. The lift guide shaft 21 engaged with the guide groove 24 of the lift guide plate 23 is positioned in the second linear groove portion A2 (FIG. 4) formed in the guide groove 24. In this state, the operation lever 42 is tilted toward the lever locking portion 43 and locked (FIG. 3). As a result, the lifting guide shaft 21 is fixed in a state where it is positioned in the second linear groove portion A2 of the guide groove 24 provided on the lifting guide plate 23, and the rear roller 12 has the second cutting height H2. It becomes the state changed to.

  Further, in this state, since the lifting guide shaft 21 is positioned in the linear groove portion A2 orthogonal to the straight line extending from the center of the guide plate support shaft 22, a large and small load that presses the lawn mower 1 is applied during lawn mowing work. However, since the load acting on the lifting guide shaft 21 acts on the linear groove A2 orthogonal to the guide plate support shaft 22, even if the load acts, a force that moves the lifting guide shaft 21 in the front-rear direction acts. Without cutting, the cutting height H2 can be stably maintained.

  Thus, according to the cutting height adjusting mechanism 20, the height of the fixed blade 13 fixed to the lawn mower body 2 is changed by changing the height of the rear roller 12, and the fixed blade 13 is rotated. The cutting height H <b> 2 with the blade 6 can be easily changed by the operation lever portion 40 of the handle 10.

  As described above, according to the cutting height adjusting mechanism 20 provided in the manual lawn mower 1, the cutting height is obtained by tilting the operation lever 42 of the operation lever portion 40 provided on the handle 10 in the front-rear direction. Since H can be easily changed, for example, when mowing long stretched lawn or dense lawn, after cutting the lawn with the cutting height H raised, the cutting height is stepwise The work of cutting with a low H can be easily performed.

  Therefore, even when mowing long lawn or dense lawn as described above, smooth lawn mowing with reduced labor without causing the mowing lawn to bite between the rotary blade 6 and the fixed blade 13. Work can be performed.

  Moreover, even if a load is applied when the operator pushes the handle 10 from above to use it, the lift guide shaft 21 is moved back and forth by the linear grooves A1 to A4 (FIG. 4) of the guide groove 24 provided on the lift guide plate 23. Since it does not move in the direction, the cutting height position can be stably maintained.

  In addition, although the example which can adjust cutting height H in four steps was demonstrated in the said embodiment, adjustment of cutting height H may be three steps or five steps, and is not limited to the said embodiment.

  Further, in the above embodiment, the manual lawn mower 1 provided with the front catching type grass collector 9 has been described as an example, but the same applies to the case of the back receiving type, and the configuration of the manual lawn mower 1 is as described above. The form is not limited.

  Furthermore, the above-described embodiment shows an example, and various modifications can be made without departing from the gist of the present invention, and the present invention is not limited to the above-described embodiment.

  The manual lawn mower according to the present invention can be used in places where the growth is not uniform and the long lawn is often mowed or the lawn is densely mowed.

1 Manual lawn mower
2 Lawn mower body
3 tires
4 wheels
5 Rotating shaft
6 Rotating blade
7 Blade material
8 Fixed plate
DESCRIPTION OF SYMBOLS 9 Grass collector 10 Handle 11 Lifting arm 12 Rear roller 13 Fixed blade 14 Arm support shaft 15 Roller shaft 16 Internal gear 17 Pinion gear 20 Cutting height adjustment mechanism 21 Lifting guide shaft 22 Guide plate support shaft 23 Lift guide plate 24 Guide groove 25 Cable holder (rotating member)
26 Arc-shaped part 27 Operation cable (operation member)
28 Biasing spring 29 Bracket 31 Straight line 40 Operation lever part 41 Lever support shaft 42 Operation lever 43 Lever locking part A1 to A4 Straight groove part B1 to B3 Arc-shaped inclined groove
m lawn
H Cutting height

Claims (6)

Wheels provided at the left and right positions of the lawn mower body,
A rotary blade arranged in a lateral direction between the wheels;
A fixed blade that is provided in the lawn mower body and mows the lawn with the rotary blade;
A rear roller provided at a rear part of a lifting arm whose front part is pivotally supported by the lawn mower body;
A cutting height adjusting mechanism that adjusts the cutting height of the lawn by the fixed blade and the rotating blade by adjusting the height of the rear roller,
A handle provided on the lawn mower body,
The cutting height adjusting mechanism has a lifting guide plate that swings a rear portion of the lifting arm and changes a height position of the rear roller,
The said handle | steering-wheel lawn mower characterized by having the operation lever part which rotates the said raising / lowering guide plate with an operation member, and adjusts the height of the said rear roller with the said raising / lowering arm. The cutting height adjusting mechanism is formed on the lawn mower body, the lifting guide plate whose upper part is pivotally supported by a guide plate support shaft, the lifting guide shaft provided on the lifting arm, and the lifting guide plate. A guide groove that engages with the lifting guide shaft to change the height position of the rear roller, and
The handle includes the operation lever portion that changes the height of the rear roller by changing the position of the lift guide shaft that engages with the guide groove by rotating the lift guide plate. The manual lawn mower according to 1. The guide groove has a plurality of setting portions that maintain a predetermined distance from the guide plate support shaft of the lift guide plate to the lift guide shaft,
2. The manual lawn mower according to claim 1, wherein the setting unit is set such that a distance from a center of the guide plate support shaft is gradually increased from one side.   The manual setting lawn mower according to claim 3, wherein the setting part is formed by a linear groove part orthogonal to a straight line extending from the center of the guide plate support shaft. The operation member is composed of an operation cable,
The guide plate support shaft has a rotating member that connects the operation cable for rotating the lifting guide plate,
5. The manual lawn mower according to claim 4, wherein the rotating member includes a cable guide portion that guides the operation cable in a concentric circle with the guide plate support shaft as a center. The rotating member has a spring member that urges the operation cable in a direction opposite to the operation lever portion,
6. The manual lawn mower according to claim 5, wherein the operation lever portion includes a lever locking portion that supports a biasing force of the spring member when the elevating guide shaft is positioned at the setting portion of the guide groove. .

Images