JP7169547B2 - Lawn mower and cultivator - Google Patents

Description

This invention performs plowing work or grass cutting work by switching a rotor shaft to which working claws are attached to forward rotation or reverse rotation. The present invention relates to a lawn mower and cultivator capable of maintaining a smooth, safe and stable mounting configuration of working claws.

Patent Document 1 describes a technique in which grass-cutting tillage tines are attached around a rotor shaft that rotates forward and backward, and the forward rotation of the rotor shaft performs tilling and the reverse rotation cuts the grass.

JP-A-2001-57802

The mowing rotor of a lawn mower is often mounted so as to be rotatable and oscillatable with respect to the blade rotor shaft, and has a hammer knife configuration. On the other hand, it is necessary to stop the swinging motion of the rotating and swinging tillage tines with a stopper or the like, which tends to generate a collision sound or an impact sound and deteriorate the durability of the tillage rotor.

According to the first aspect of the invention, a working claw 4 is attached to a claw holder 2 welded to a rotor shaft 1 by means of a fixture 3 so as to be swingable in the rotational direction of the rotor shaft 1. 19 is formed in a shape curved upward with the working claw 4 positioned in the front region of the rotor shaft 1, and the outer peripheral edge of the curved body portion 19 is driven into the soil surface. A plowing edge 5 for plowing is formed with a plow, and a cutting blade edge 6 for cutting grass stems is formed at the tip of the inner peripheral edge of the curved body portion 19 . , a pawl that protrudes toward the outer peripheral portion of the rotor shaft 1 from the hole 7 through which the fixture 3 is inserted, contacts the outer peripheral surface of the rotor shaft 1, and restricts the swinging range of the working pawl 4 during forward rotation R. The rear portion 8 is formed, and the position of the center of gravity G of the working claw 4 is positioned on the side opposite to the bending direction of the curved working claw 4 from the centrifugal force direction line g of the working claw 4 passing through the hole 7 position of the mounting base 18. As a configuration in which the rotor shaft 1 rotates in an appropriately biased state, the configuration of the cultivator for both mowing and mowing enables the forward rotation R of the rotor shaft 1 to perform tilling work and the reverse rotation Q to perform grass cutting work.

With the working claws 4 attached to the claw holders 2 welded to the rotor shaft 1 with the mounting fixtures 3, when the rotor shaft 1 is forwardly rotated R-driven in a no-load operation state in which neither plowing nor mowing work is performed, the working claws 4 are The claw holder 2 is rotated around the mounting fixture 3, and rotated so that the center of gravity G of each working claw 4 is directed toward the centrifugal force direction line g, and the claw bottom portion 8 is pressed against the outer peripheral surface of the rotor shaft 1. , or is acting to approach. The swinging action of the working claws 4 by the rotation of the rotor shaft 1 is effective even during plowing work at relatively low speed rotation (approximately 250 rpm/60 seconds) and at high speed rotation (approximately 2800 rpm/60 seconds). It works in the same way during mowing work.

When the lawn mower and cultivator is operated in forward F travel, the rotor shaft 1 of the work claw rotor 21 mounted on the front side of the machine 20 is rotated forward R (tillage rotation) so that it is arranged on the rotor shaft 1. The working claws 4 are driven to rotate downward in the forward region of the rotor shaft 1 (downward rotation), and are attached to the claw holders 2 of the rotor shaft 1 by the mounting fixtures 3. The claws 4 drive and intervene the tilling edge 5 formed on the forward rotation R direction side into the soil surface to till the soil. At this time, due to the plowing resistance of the working claws 4 , a force in the direction opposite to the forward rotation R direction acts around the fixture 3 of the claw holder 2 , and the claw bottom portion 8 of the working claws 4 is pushed against the outer peripheral surface of the rotor shaft 1 . are abutted. For this reason, the working claws 4 can be rotated forward R in a state in which the claw bottom portion 8 is received by the outer peripheral surface of the rotor shaft 1 for plowing.

As described above, during tillage work, when the rotor shaft 1 is rotating, the claw bottom portion 8 is always pressed against the outer peripheral surface of the rotor shaft 1 due to the rotation of the working claws 4 due to the centrifugal force. Since it is rare that a large gap is formed between the outer peripheral surface of the rotor shaft 1 and the nail bottom portion 8, the impact phenomenon between them is also small.

Further, the rotor shaft 1 having the working claws 4 is rotated Q (grass cutting rotation) in the opposite direction to the normal rotation R during tillage, and the working claws 4 arranged on the rotor shaft 1 are moved upward in the front area of the rotor shaft 1. The lawn grass on the soil surface can be mowed by the cutting blade edge 6 of the working claw 4 by rotationally driving in the form of rotation (upper rotation). Since the reverse rotation Q of the rotor shaft 1 during mowing is set to be much higher than the forward rotation R during tillage work, the centrifugal force of the working claws 4 is also large. Even if the claw bottom portion 8 of 4 is strongly pressed against the outer peripheral surface of the rotor shaft 1 to receive the cutting resistance of the grass stem, the cutting action can be performed smoothly. Moreover, if the cutting blade edge 6 hits the ground during cutting or is overloaded due to contact with foreign objects such as stones and gravel, the working claw 4 for cutting grass stems rotates around the fixture 3 in the direction opposite to the rotation direction. The claw bottom portion 8 is separated from the outer peripheral surface of the rotor shaft 1 to prevent the working claw 4 from being damaged.

According to the second aspect of the invention, the claw holders 2 arranged around the rotor shaft 1 have mounting bases for the working claws 4 between a pair of left and right holder plates 16, 16 formed with holes 9 through which the mounting fixtures 3 are inserted. 18 is formed, and with the holes 9, 9 of the holder plates 16, 16 positioned directly above the rotor shaft 1, the rotor shaft 1 is pushed backward from the hole 9 of the holder plate 16 on one of the left and right sides. A holder edge 10 protruding long and a holder edge 11 protruding forward from holes 9 of holder plates 16 on the other left and right sides are formed, and each of the left and right holder edges 10, 11 is positioned forwardly around the rotor shaft 1, The holder plates 16, 16 facing the holder edges 10, 11 are provided with open portions 12, 13 where the holder edges 10, 11 are not formed.

The claw holder 2 on the rotor shaft 1 to which the working claws 4 are attached is inserted into the spacing portion 17 between the pair of left and right holder plates 16, 16 so as to sandwich the mounting base portion 18 of the working claws 4. , 16, and through a hole 7 formed in a mounting base 18 of the working claw 4, the working claw 4 is attached so that the working claw 4 can swing around the mounting jig 3. As shown in FIG.

The holder plates 16, 16 of the claw holder 2 are positioned rearward from the holes 9 of the holder plate 16 on one of the left and right sides with the holes 9, 9 of the holder plates 16, 16 positioned right above the rotor shaft 1. A long overhanging holder edge 10 and a holder edge 11 long overhanging forward from holes 9 of holder plates 16 on the other left and right sides are formed and integrally fixed to the outer peripheral surface of the rotor shaft 1 . That is, the holder plate 16 facing the holder plate 16 is formed with the holder edge 11 protruding in the front-back direction opposite to the holder edge 10 . Further, the front and rear edges of the holder plate 16 facing the holder edges 10 and 11 are not formed to protrude, and open portions 12 and 13 are provided in which the holder edges 10 and 11 are not formed. Accordingly, one side portion of the mounting base portion 18 of the working claw 4 which is fitted and clamped in the space portion 17 between the pair of left and right holder plates 16, 16 of the claw holder 2 is overlapped by the holder edge 10 or 11. However, the side surface opposite to the holder edge 10 or 11 is opened by the openings 12 and 13 so that cultivated soil, cut grass, etc. Makes it easier to eject.

According to the third aspect of the invention, there is provided a mounting portion of the working claw 4 which is fitted to the claw holder 2 and mounted by inserting the mounting fixture 3, and the claw bottom portion 8 is in contact with the outer peripheral surface of the rotor shaft 1. , the outer peripheral edge 14 of the mounting base portion 18 and the nail tail portion 8 of the working claw 4 is moved to the outer peripheral side from the outer peripheral edge 15 of the holder plate 16 around the hole 9 of the claw holder 2 and the outer peripheral edge 15 of the holder edge 10. It is configured to protrude.

The working claw 4 is attached to the claw holder 2 by the mounting fixture 3 so that it can swing freely. If it penetrates, it is likely to cause swing resistance of the working claw, but the outer peripheral edge 14 of the mounting base 18 and the nail bottom portion 8 of the working claw 4 is provided so as to face the mounting base portion 18 and the nail bottom portion 8 . Since it is formed to protrude outward from the outer peripheral edge 15 of the plate 16 and the outer peripheral edge 15 of the holder edge 10, foreign matter is prevented from entering the gap 17 between the holder plates 16, 16, and the working claw 4 , and the attachment of the working claw 4 to the claw holder 2 can be stably maintained.

According to the first aspect of the invention, a plowing edge 5 is formed on the outer edge of a curved working claw 4, and a cutting edge 6 is formed on the tip of the inner peripheral edge, and the rotor shaft 1 rotates forward R or By setting the position of the center of gravity G of the working claws 4 and the setting of the center of gravity G of the working claws 4, the working claws 4 are exerted by centrifugal force when the rotor shaft 1 is rotating. Therefore, the working claws 4 can be rotated along the centrifugal force direction line g during both the tilling rotation and the mowing rotation, so that the working claws 4 The butt end portion 8 of the blade is brought into contact with the outer peripheral surface of the rotor shaft 1 so as to be strongly pressed, so that the rotary tilling and mowing postures of the working claws 4 can be stably held. Such swinging of the working claws 4 around the fixture 3 due to the rotation of the rotor shaft 1 occurs even during tillage work with the forward rotation R at a relatively low speed and during mowing work with the reverse rotation Q at a high speed. Similarly, the claw bottom portion 8 can be brought into contact with the outer peripheral surface of the rotor shaft 1 by the centrifugal force of the working claws 4 to stop and regulate the rocking movement. The contact state with the rotor shaft 1 is maintained for a long time, and there is an effect that it is possible to suppress the wear of the contact portion and the generation of hammering sound due to repeated contact and separation.

The reaction force of the tilling action during the tilling work is received over a wide range by bringing the claw bottom portion 8 formed to protrude from the hole 7 of the working claw 4 into contact with the outer periphery of the strong rotor shaft 1. Impact force can be moderated, and damage and wear of the rotor shaft 1 and the working claws 4 can be reduced. In addition, in such a form, except for the fixture 3 for attaching and detaching the working claw 4 and the nut for retaining it, no auxiliary parts are required, so the structure is simple and the production is low cost. It is possible to reduce the scattering, loss, damage, etc. of parts falling off during tillage work or mowing work.

According to the second aspect of the invention, the working claw 4 mounted and supported so as to swing back and forth around the mounting fixture 3 has the mounting base 18 positioned at the space 17 and the pair of left and right holder plates 16, 16. The holder plates 16, 16 are sandwiched between and fitted and supported around the fixture 3. With the holes 9, 9 of the holder plates 16, 16 positioned right above the rotor shaft 1, the holder plate 16 on one of the left and right sides The holder edge 10 is projected long toward the side and fixed to the outer peripheral surface of the rotor shaft 1, and the holder edge 11 is projected long and fixed to the outer peripheral surface of the rotor shaft 1 on the front side of the holder plate 16 on the left and right other side. These left and right holder plates 16, 16 are configured in such a manner that the left and right holder edges 10, 11 are distributed in the front and rear directions around the rotor shaft 1, and the holder edges 10, 11 are opposite to the holder edges 10, 11. By providing the openings 12 and 13 without forming holder edges at the front and rear ends of the holder plate 16, the mounting of the holder plates 16 and 16 to the rotor shaft 1 can be made firm and the work can be facilitated. Even if a strong lateral load resistance acts on the claws 4, the front and rear holder edges 10 and 11 receive the lateral swing of the working claws 4 and changes in distortion, thereby performing stable plowing and mowing operations. can let

Further, during tillage work or mowing work, soil, grass clippings, etc. often enter the space 17 of the claw holder 2 or between the holder plates 16, 16 and the mounting base 18 of the working claw 4. However, the overlapping width in the longitudinal direction around the holes 9, 9 of the left and right holder plates 16, 16 is set relatively narrow, and the holder edges 10, 11 projecting forward and backward are formed long to form a pawl holder for the rotor shaft 1. 2 rigid mounting configuration. Moreover, on the side facing surfaces of the holder edges 10 and 11, openings 12 and 13 are provided where the holder edges 10 and 11 are not formed. Even if foreign matter enters, it is easily discharged to the outside, and stagnation or accumulation of soil, grass clippings, etc. between the inside of the claw holder 2 and the mounting base 18 can be reduced.

According to the third aspect of the invention, the mounting base portion 18 of the working claw 4 and the outer peripheral edge 14 of the nail bottom portion 8 in a state in which the nail bottom portion 8 is in contact with the outer peripheral surface of the rotor shaft 1 are attached to the mounting base portion 18. By forming the holder plate 16 so as to sandwich the left and right side surfaces of the holder plate 16 around the hole 9 and the outer peripheral edge 15 of the holder edge 10, the working claw 4 and the claw holder 2 are formed to protrude to the outer circumference. Holder plates 16, 16 for intervening and supporting the mounting base 18 of the working claw 4 and the surroundings of the nail bottom portion 8 prevent the foreign matter from contacting the soil surface, lawn grass, etc. It is difficult for the particles to enter the gap 17 between them and the gap between the holder edge 10 facing the nail bottom part 8 and the nail bottom part 8 , and the particles are guided to be discharged outside the outer peripheral edge 15 of the holder plate 16 . This effect is particularly effective against soil invasion and accumulation during plowing work in which the claw bottom portion 9 of the working claw 4 is pressed against the rotor shaft 1 and the working claw 4 does not swing. In this manner, the working claw 4 can be stably operated with a very simple structure by the shape of the mounting base portion 18 and the claw tail portion 8 of the working claw 4 and the shape of the holder plate 16 for mounting and holding the working claw 4. can be maintained.

FIG. 2 is a side view of the mower and cultivator. Fig. 2 is a plan view of the mower and cultivator. FIG. 2 is a side view of the mower and cultivator equipped with a hiller. The side view which shows the state of the working nail|claw at the time of mowing and tilling. Partial plan view (a) and side view (b) showing the mounting form of the working claw. Partial plan view (a) and side view (b) showing the mounting state of the working claw. FIG. 2 is an exploded perspective view of part of the working claw;

Based on the drawings, a working claw rotor 21 having working claws 4 is mounted on the front side of the machine 20, and a traveling transmission with wheels 24 mounted on both left and right ends of a shaft 25 on the lower side of the main transmission case 23. A case 26 is provided, and an engine base 28 on which an engine 27 is mounted is provided on the rear side, and on the upper side, it turns left and right around a handle rotation shaft 38 in the vertical direction to switch the projecting direction of the handle grip 29. A handle 30 is provided for enabling.

On the front side of the main transmission case 23, there are provided a chain transmission case 33 and a belt transmission case 34, respectively. The side ends of the rotor shaft 1 in the horizontal direction are supported between the front ends of the chain transmission case 33 and the belt transmission case 34, and the rotor shaft 1 and the chain mechanism of the chain transmission case 33 are supported. It is configured in such a manner that it can be used for plowing by power transmission rotation and mowing work by power transmission rotation through the belt transmission mechanism of the belt transmission case 34 . The upper peripheral surface of the work claw rotor 21 is covered with a rotor cover 35. - 特許庁36 is a gauge wheel that can adjust the grass cutting height and tillage depth, and 37 is a gauge wheel that adjusts the height of the hiller 22 .

During tillage work by the work claw rotor 21, tillage work is performed while traveling forward F, finishing tillage is carried out while traveling backward K, or the cultivated soil surface is improved by mounting the soil cultivator 22 and traveling backward K. can be cultivated at the same time. Further, during the mowing work, the mowing work can be performed while the forward F traveling operation is performed with the working claw rotor 21 positioned on the front side by removing the soil cultivating device 22 on the front side of the working claw rotor 21 . .

The working claws 4 attached around the rotor shaft 1 have an appropriate thickness from the mounting base 18 to the tip, and a width along the rotation direction so that the tip of the claw rotates in the forward rotation R direction (tilting rotation direction). The curved claw body portion 19 is curved in the reverse rotation Q direction (reaping rotation direction) opposite to the above, that is, in the front region of the rotor shaft 1, the body portion 19 of the working claw 4 is curved upward. It is in the form of The tillage edge 5 is formed along the outer peripheral edge portion which is the front edge of the curved claw body portion 19 in the forward rotation R direction. A curved surface portion 40 is formed so as to facilitate reversing and guiding of cultivated soil. A blade edge line A of the cutting blade edge 6 at the tip of the curved claw body 19 is formed to intersect C in a plan view with a lateral axial center line B of the rotor shaft 1 to which the working claw 4 is attached. . (Refer to Fig. 6) Since the cutting edge 6 cuts the grass stem by rotating it, the cutting performance should be kept high and the damage caused by the impact of foreign objects on the cutting edge 6 should be reduced. can be done. The claw butt portion 8 of the working claw 4 protrudes along the outer peripheral surface of the rotor shaft 1, rotates around the mounting fixture 3, and moves from a state in which it is engaged with the outer peripheral surface of the rotor shaft 1 to an appropriate position. It is configured to be able to swing D in the angular range.

With the working claws 4 attached to the claw holders 2 welded to the rotor shaft 1 by means of the mounting fixtures 3, the working claws 4 are driven in the forward rotation R direction in a no-load operation state in which neither plowing work nor mowing work is performed. is rotated around the mounting fixture 3 of the claw holder 2 to turn the center of gravity G of each working claw 4 toward the centrifugal force direction line g, so that the claw bottom portion 8 is aligned with the outer peripheral surface of the rotor shaft 1. Acting to press or approach. The swinging action of the working claws 4 by the rotation of the rotor shaft 1 is effective even during plowing work at relatively low speed rotation (approximately 250 rpm/60 seconds) and at high speed rotation (approximately 2800 rpm/60 seconds). It works in the same way during mowing work.

When the lawn mower and cultivator is operated in forward F travel, the rotor shaft 1 of the work claw rotor 21 mounted on the front side of the machine 20 is rotated forward R (tillage rotation) so that it is arranged on the rotor shaft 1. The working claws 4 are driven to rotate downward in the forward region of the rotor shaft 1 (downward rotation), and are attached to the claw holders 2 of the rotor shaft 1 by the mounting fixtures 3. The claws 4 drive and intervene the tilling edge 5 formed on the positive rotation R direction side into the soil surface to till the soil. At this time, due to the plowing resistance of the working claws 4 , a force in the direction opposite to the forward rotation R direction acts around the mounting fixture 3 of the claw holder 2 , and the claw bottom portion 8 of the working claws 4 is moved to the peripheral surface of the rotor shaft 1 . abutted to. For this reason, the working claws 4 can be rotated forward R in a state that the claw bottom portion 8 is received by the peripheral surface of the rotor shaft 1 for plowing.

As described above, during tillage work, when the rotor shaft 1 is rotating, the claw bottom portion 8 is always pressed against the outer peripheral surface of the rotor shaft 1 due to the rotation of the working claws 4 due to the centrifugal force. Since it is rare that a large gap is formed between the outer peripheral surface of the rotor shaft 1 and the nail bottom portion 8, the impact phenomenon between them is also small.

Further, the rotor shaft 1 having the working claws 4 is rotated Q (grass cutting rotation) in the opposite direction to the normal rotation R during tillage, and the working claws 4 arranged on the rotor shaft 1 are moved upward in the front area of the rotor shaft 1. The lawn grass on the soil surface can be mowed by the cutting blade edge 6 of the working claw 4 by rotationally driving in the form of rotation (upper rotation). Since the reverse rotation Q of the rotor shaft 1 during mowing is set to be much higher than the forward rotation R during tillage work, the centrifugal force of the working claws 4 is also large. 4 is strongly pressed against the outer peripheral surface of the rotor shaft 1, and the cutting action can be performed smoothly even if receiving the cutting resistance of the grass stem. Moreover, if the cutting edge 6 hits the ground or is overloaded by hitting foreign objects such as stones and gravel during mowing, the working claws 4 for cutting grass stems will not rotate around the fixture 3 during mowing work. The working claws 4 are prevented from being damaged by retracting and rotating so as to escape in the opposite direction to separate the claw bottom portion 8 from the outer peripheral surface of the rotor shaft 1. - 特許庁

The working claw 4 is curved upward in the front region of the rotor shaft 1 and has a curved surface portion 40 formed by curving the tip portion in the left and right lateral directions. The curved surface portion 40 is formed with a plowing edge 5 for driving and intervening in the tilled soil surface and a cutting edge 6 for cutting grass stems. During plowing or mowing, an acting force P acts on the curved surface portion 40 from the inside toward the outside, so the holder edges 10 and 11 of the holder plate 16 spread the acting force P of the working claws 4 over a wide range. Arranged and configured in a form that is easy to receive. That is, the mounting base 18 around the mounting hole 7 of the working claw 4 is configured to receive the acting force P by the holder plate 16 located on the side opposite to the curved side in the left-right lateral direction. Since the portion extending from the hole 7 to the nail bottom portion 8 is configured to receive the acting force P by the holder edge 10 of the holder plate 16 provided on the curved inner surface side of the working claw 4, the lateral direction of the working claw 4 is reduced. It is possible to enhance the support effect of the bending force to.

Each of the working claws 4 has a mounting base 18 fitted in a space 17 between the holder plates 16 forming the claw holder 2, and the working claw 4 swings freely around the fixture 3 at the space 17. be supported by Each holder plate 16, 16 is attached and fixed to the outer peripheral portion of the rotor shaft 1 by welding or the like, and a work of forming a hole 9 parallel to the axial center line B of the rotor shaft 1 and fitting it into the space portion 17. The fixture 3 is inserted through the hole 7 formed in the mounting base 18 of the pawl 4, and a nut 39 is screwed to prevent it from coming off.

A pair of left and right holder plates 16 , 16 constituting the claw holder 2 are formed with holes 9 , 9 through which the fixture 3 is inserted. , the rear ends of the holder plates 16 on one of the left and right sides form holder edges 10 that protrude along the outer peripheral surface of the rotor shaft 1, and the front ends of the holder plates 16 on the other left and right sides are formed. A holder edge 11 having a similar shape is also formed on the rotor shaft 1 , and the inner edges of these elongated holder edges 10 and 11 are welded and fixed to the outer peripheral surface of the rotor shaft 1 . As described above, the front and rear holder edges 10, 11 are arranged in a state in which the holes 9, 9 of the holder plates 16, 16 are positioned right above the rotor shaft 1, and are arranged in a state of being inconsistent with each other. The outer surface of the mounting base 18 on the side where the edges 10 and 11 are not formed is formed as openings 12 and 13, and the openings 12 and 13 are fitted into the spacing portions 17 of the holder plates 16 and 16 provided with the openings 12 and 13. The left and right side surfaces of the working claw 4 to be attached are widely open except for the peripheral portions of the holes 9 and 9 of the foil plates 16 and 16, and the holder plate 16, the holder edges 10 and 11, and the mounting base 18. Even if foreign matter enters between them, it is easily discharged to the openings 12 and 13, and the phenomenon of stagnation and accumulation of foreign matter over a long period of time is reduced.

The working claw 4 attached to the claw holder 2 has a wide outer peripheral edge 14 around the hole 7 of the mounting base 18 and the bottom portion 8 of the claw. The holder plates 16 and 16 and the outer peripheral edges 15 of the holder edges 10 and 11 are protruded outward. With this configuration, even if the working claw 4 or the claw holder 2 comes into contact with the soil surface, lawn grass, or the like during work, or is pressed against foreign matter, the foreign matter received around the mounting base 18 of the working claw 4 and the nail bottom portion 8 will be removed. , the space 17 between the holder plates 16, 16 interveningly supporting the attachment base 18 and the gap between the holder edge 10 facing the nail bottom portion 8 and the nail bottom portion 8 are difficult to enter. 15 is extruded or ejected. This action and effect is particularly effective against the intrusion and accumulation of soil during plowing work in which the tail portion 8 of the working claw 4 is pressed against the rotor shaft 1 and the working claw 4 does not swing D. With an extremely simple configuration, the working claw 4 can be maintained in a stable operating state.

REFERENCE SIGNS LIST 1 rotor shaft 2 claw holder 3 fixture 4 working claw 5 tillage edge 6 cutting edge 7 hole 8 claw bottom portion 9 hole 10 holder edge 11 holder edge 12 opening portion 13 opening portion 14 outer peripheral edge 15 outer peripheral edge 16 holder plate 17 interval Part 18 Mounting base 19 Body part G Center of gravity Q Reverse rotation R Forward rotation g Direction of centrifugal force

Claims (3)

A working claw (4) is attached to a claw holder (2) welded to the rotor shaft (1) by a fixture (3) so as to be swingable in the rotational direction of the rotor shaft (1), and the working claw (4) The body (19) of the body (19) is curved upward with the working claw (4) located in the front region of the rotor shaft (1) in a side view, and the curved body (19) A tillage edge (5) is formed on the outer peripheral edge of the body part (5) for tilling by driving and intervening in the soil surface, and a cutting blade for cutting grass stems is formed on the tip of the inner peripheral edge of the curved body part (19). A rim (6) is formed, and in the mounting base (18) to the claw holder (2), a hole (7) through which the mounting fixture (3) is inserted extends from the hole (7) toward the outer circumference of the rotor shaft (1). A claw bottom portion (8) that overhangs and abuts on the outer peripheral surface of the rotor shaft (1) to regulate the swinging range of the working claw (4) during forward rotation (R) is formed. center of gravity (G) position of the curved working claw (4) toward the anti-bending direction side of the working claw (4) from the centrifugal force direction line g of the working claw (4) passing through the hole (7) position of the mounting base (18) A lawn mower and cultivator capable of cultivating by forward rotation (R) of a rotor shaft (1) and cutting grass by reverse rotation (Q) of the rotor shaft (1). The claw holder (2) arranged around the rotor shaft (1) has working claws ( 4) A holder spacing portion (17) for sandwiching the mounting base (18) is formed, and the holder plates (16), (16) holes (9), (9) are directly above the rotor shaft (1). When positioned, the holder edge (10) protrudes rearward from the hole (9) of the holder plate (16) on one of the left and right sides, and the holder edge (10) extends forward from the hole (9) of the holder plate (16) on the other left and right. The left and right holder edges (10) and (11) are distributed in the front and rear directions around the rotor shaft (1), and the holder edges (11) protrude in the direction of the rotor shaft (1). The holder plates (16) and (16) on the sides facing (10) and (11) are provided with openings (12) and (13) that do not form the holder edges (10) and (11). The lawn mower and cultivator according to claim 1. Mounting portion of the working claw (4) fitted to the claw holder (2) and mounted by inserting the fixture (3), and the claw bottom portion (8) is in contact with the outer peripheral surface of the rotor shaft (1). , the outer peripheral edge (14) between the mounting base (18) and nail tail (8) of the working claw (4) is aligned with the outer peripheral edge of the holder plate (16) around the hole (9) of the claw holder (2). 3. The lawn mower and cultivator according to claim 1 or 2, wherein (15) and the holder edge (10) are formed so as to protrude outward from the outer peripheral edge (15) of the holder edge (10).

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