Mower

Abstract

To provide a mower which can suppress an increase in part count and weight.SOLUTION: A mower A1 includes: a drive part 1; a support member 2 and a first mowing blade 3 attached to and detached from the drive part 1; and a fixing member 5 for fixing the support member 2 to the drive part 1. The drive part 1 includes a first reciprocal drive part 14 that reciprocates in a first direction x. The support member 2 includes: a body 21; a fixed part 22 fixed by the fixing member 5; and a guide part 23. The first mowing blade 3 includes: a first main part 31 extending in the first direction x; a plurality of first blades 32 each projecting from the first main part 31; a first engagement part 33 engaging with the first reciprocal drive part 14; and a first guided part 34 guided by the guide part 23. The first mowing blade is supported in a relatively movable manner in the first direction x with respect to the support member 2 in a state of overlapping the support member 2. When the fixing member 5 is removed, the support member 2 and the first mowing blade 3 can de detached from the drive part 1 and the first mowing blade 3 can be detached from the support member 2.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a brush cutter. [Background technology]

[0002] In horticulture and agriculture, grass cutters are widely used as tools for cutting weeds and other grass growing on the ground. Patent Document 1 discloses an example of a conventional grass cutter. The grass cutter A1 disclosed in this document includes a transmission case, a pair of reciprocating cutting blades, and a blade support member. The pair of cutting blades are stacked on top of each other in the thickness direction and are reciprocated by a reciprocating body of the transmission case. The blade support member sandwiches the pair of reciprocating cutting blades and supports them for free movement. The blade support member is detachably attached to the transmission case while supporting the pair of reciprocating cutting blades. This allows the pair of reciprocating cutting blades and the blade support member to be attached to and detached from the transmission case as an integrated unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7253461 Summary of the Invention [Problem to be solved by the invention]

[0004] To handle the pair of reciprocating cutting blades and the blade support member as an integrated unit, the blade support member must support the pair of reciprocating cutting blades by sandwiching them from both sides in the thickness direction. This structure can lead to an increase in the number of parts and weight of the blade support member. Such an increase in parts and weight can increase the price of the brush cutter and make it more difficult to handle.

[0005] The present invention was conceived in light of the above circumstances, and an object of the present invention is to provide a brush cutter that can suppress an increase in parts and weight. [Means for solving the problem]

[0006] A brush cutter provided by a first aspect of the present invention comprises a drive unit, a support member and a first cutting blade that are detachable from the drive unit, and a fixing member that fixes the support member to the drive unit, wherein the drive unit has a first reciprocating drive unit that reciprocates in a first direction, the support member has a main body portion, a fixed portion fixed by the fixing member, and a guide portion, the first cutting blade has a first main portion extending in the first direction, a plurality of first blade portions each protruding from the first main portion, a first engagement portion that engages with the first reciprocating drive unit, and a first guided portion guided by the guide portion, and is supported on the support member while overlapping it so as to be movable relative to the support member in the first direction, and when the fixing member is removed, the support member and the first cutting blade can be detached from the drive unit, and the first cutting blade can be detached from the support member.

[0007] In a preferred embodiment of the present invention, the drive unit further has a second reciprocating drive unit that reciprocates in the first direction, and has a second main portion extending in the first direction, a plurality of second blade portions each protruding from the second main portion, a second engagement portion that engages with the second reciprocating drive unit, and a second guided portion that is guided by the guide portion, and further includes a second cutting blade that is supported in a state overlapping the support member and the first cutting blade and is movable relative to the support member and the first cutting blade in the first direction, and when the fixing member is removed, the support member, the first cutting blade, and the second cutting blade can be detached from the drive unit, and the first cutting blade and the second cutting blade can be detached from the support member.

[0008] In a preferred embodiment of the present invention, the support member further includes a plurality of fixed blade portions each protruding from the main body portion.

[0009] In a preferred embodiment of the present invention, the drive unit has a support unit located on the opposite side of the first cutting blade from the support member.

[0010] A brush cutter provided by a second aspect of the present invention comprises a drive unit, a support member and a first cutting blade that are detachable from the drive unit, and a fixing member that fixes the support member to the drive unit, wherein the drive unit has a first reciprocating drive unit that reciprocates in a first direction, the first cutting blade engages with the first reciprocating drive unit and is supported so as to be movable relative to the support member in the first direction, and when the fixing member is removed, the support member and the first cutting blade can be detached from the drive unit and the first cutting blade can be detached from the support member, and the brush cutter further comprises a restraining member that is detachable from the support member and the first cutting blade and can restrain the relative positions of the support member and the first cutting blade when the support member and the first cutting blade are attached to the drive unit, and when the fixing member is removed with the restraining member attached, the support member and the first cutting blade can be detached from the drive unit while being restrained by the restraining member. [Effects of the Invention]

[0011] According to the present invention, it is possible to suppress an increase in the number of parts and weight of the brush cutter.

[0012] Other features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is an overall perspective view showing a grass mower according to a first embodiment of the present invention. [Figure 2] 1 is a partial perspective view showing a grass mower according to a first embodiment of the present invention. [Figure 3] 1 is a partially exploded perspective view showing a grass mower according to a first embodiment of the present invention. [Figure 4] 1 is a partial plan view showing a grass mower according to a first embodiment of the present invention. [Figure 5] FIG. 5 is a partial cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a partial cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 6 is a partial perspective view showing a grass mower according to a second embodiment of the present invention. [Figure 8] FIG. 6 is a partial plan view showing a grass mower according to a second embodiment of the present invention. [Figure 9] FIG. 6 is a partial bottom view showing a grass mower according to a second embodiment of the present invention. [Figure 10] FIG. 9 is a partial cross-sectional view taken along line XX in FIG. 8. [Figure 11] FIG. 6 is a partially exploded perspective view showing a grass mower according to a second embodiment of the present invention. [Figure 12] FIG. 10 is a partial cross-sectional view showing a grass mower according to a third embodiment of the present invention. [Figure 13] FIG. 10 is a partially exploded perspective view showing a grass mower according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] Preferred embodiments of the present invention will now be described in detail with reference to the drawings.

[0015] The terms "first," "second," "third," etc. in this disclosure are used for identification purposes only and are not intended to impose any ranking on their objects.

[0016] 1 to 6 show a grass cutter according to a first embodiment of the present invention. The grass cutter A1 of this embodiment comprises a drive unit 1, a support member 2, a first cutting blade 3, a second cutting blade 4, a fixing member 5, and an operating lever 9. The grass cutter A1 is used as a tool for cutting weeds that grow on the ground, for example, in gardening or agriculture. In this embodiment, the grass cutter A1 is provided with the operating lever 9, but the grass cutter A1 may be provided with operating means having a different configuration from the operating lever 9 of this embodiment, or may be distributed and sold without means equivalent to the operating lever 9.

[0017] Fig. 1 is an overall perspective view showing the grass cutter A1. Fig. 2 is a partial perspective view showing the grass cutter A1. Fig. 3 is a partial exploded perspective view showing the grass cutter A1. Fig. 4 is a partial plan view showing the grass cutter A1. Fig. 5 is a partial cross-sectional view taken along line VV in Fig. 4. Fig. 6 is a partial cross-sectional view taken along line VI-VI in Fig. 4.

[0018] In these figures, the first direction x, the second direction y, and the third direction z are mutually perpendicular. The second direction y may correspond to the front-to-rear direction, one of which may be referred to as the front and the other as the rear. The third direction z may correspond to the vertical direction, one of which may be referred to as the upward direction and the other as the downward direction. The third direction z may also correspond to the thickness direction of the first cutting blade 3.

[0019] The drive unit 1 is a part that performs the function of driving the first cutting blade 3 and the second cutting blade 4. The drive unit 1 of this embodiment has a first reciprocating drive unit 14 and a second reciprocating drive unit 15 shown in FIG. 6. The first reciprocating drive unit 14 and the second reciprocating drive unit 15 are members that reciprocate in a first direction x. In this embodiment, the first reciprocating drive unit 14 and the second reciprocating drive unit 15 move in opposite directions to each other in the first direction x, that is, move so as to intersect with each other. In this embodiment, the first reciprocating drive unit 14 and the second reciprocating drive unit 15 are arranged to overlap in a third direction z, and the first reciprocating drive unit 14 is located above the second reciprocating drive unit 15 in the third direction z.

[0020] The first reciprocating drive unit 14 and the second reciprocating drive unit 15 are formed of, for example, metal. There are no limitations on the specific shapes, sizes, etc. of the first reciprocating drive unit 14 and the second reciprocating drive unit 15. The first reciprocating drive unit 14 and the second reciprocating drive unit 15 may be, for example, a rectangular or other plate-like portion extending forward in the second direction y from the center of the drive unit 1 when viewed in the third direction z.

[0021] The driving unit 1 may further include a pair of holding units 11 and 12 and a support unit 13 .

[0022] The holding portion 11 and the holding portion 12 are spaced apart from each other in the third direction z. A gap that opens forward in the second direction y is provided between the holding portion 11 and the holding portion 12. As shown in FIGS. 3 and 5, the holding portion 11 has two through holes 111. The two through holes 111 penetrate the holding portion 11 in the third direction z and are spaced apart from each other in the second direction y.

[0023] 5 and 6, the holding unit 12 may include a structural member 121 and a cover member 122. The structural member 121 is a structural portion for fixing the support unit 13. The cover member 122 covers the structural member 121 from below in the third direction z.

[0024] As shown in FIGS. 3, 5, and 6, the support portion 13 is located above the holder 12 in the third direction z. The support portion 13 is formed of, for example, metal or resin. The support portion 13 has a shape whose longitudinal direction is the first direction x. In the illustrated example, the length of the support portion 13 in the first direction x is shorter than the lengths of the support member 2, the first cutting blade 3, and the second cutting blade 4 in the first direction x.

[0025] In this example, the support part 13 is fixed to the structure part 121 by two fixing members 16. The specific configuration of the fixing members 16 is not limited in any way and may be, for example, a bolt. The support part 13 has two fixed parts 131. The fixed parts 131 are members having female threads onto which the fixing members 16 are threaded. The two fixing members 16 are inserted into the structure part 121 and threaded into the two fixed parts 131, thereby fixing the support part 13 to the structure part 121. In this example, the two fixing members 16 are covered by a cover part 122 from below in the third direction z and are not visible from the outside of the brush cutter A1.

[0026] The drive unit 1 may incorporate a drive source (not shown) such as a motor for driving the first reciprocating drive unit 14 and the second reciprocating drive unit 15. For example, the first reciprocating drive unit 14 and the second reciprocating drive unit 15 are reciprocated in the first direction x by a crank mechanism (not shown) or the like connected to the drive shaft of the motor.

[0027] The operating stick 9 is used by the user of the brush cutter A1 to operate the brush cutter A1. There are no limitations on the specific configuration of the operating stick 9, and in the illustrated example, as shown in Fig. 1, the operating stick 9 has a rod-shaped member attached to a cylindrical portion provided at the rear end of the drive unit 1 in the second direction y. The operating stick 9 may also have a handle 91, a handle 92, a switch 93, a battery 94, etc.

[0028] Handle 91 is a part that a user holds with one hand. Handle 92 is a part that a user holds with the other hand. Switch 93 performs an operation input to cut weeds and the like with first cutting blade 3 and second cutting blade 4 by reciprocating first reciprocating drive unit 14 and second reciprocating drive unit 15. Battery 94 supplies power to the motor and the like and may be, for example, a removable secondary battery.

[0029] Furthermore, the brush cutter A1 may have a structure in which a drive source such as a motor is built into the drive unit 1, or may have a structure in which the drive source is attached to the battery 94 or near the handle 91. In such a case, the rod-shaped member of the operating lever 9 may have a built-in transmission shaft for transmitting the drive force of the motor or the like to the first reciprocating drive unit 14 and the second reciprocating drive unit 15.

[0030] The support member 2 fixes the first cutting blade 3 and the second cutting blade 4 to the drive unit 1 and is a member for supporting at least the first cutting blade 3 so as to be relatively movable in the first direction x. In this embodiment, the first cutting blade 3 and the second cutting blade 4 are supported so as to be relatively movable with respect to the support member 2. The specific configuration of the support member 2 is not limited in any way, and in this embodiment, as shown in FIGS. 2 to 6, the support member 2 has a main body portion 21, a plurality of fixed portions 22, a plurality of guide portions 23, an extension portion 24, and two corner portions 26. The support member 2 is formed, for example, from a metal plate material whose thickness direction is in the third direction z.

[0031] The main body portion 21 is a portion that extends long in the first direction x. The fixed portion 22 is a portion that is used when the support member 2 is fixed to the drive portion 1 by the fixing member 5. The specific configuration of the fixed portion 22 is not limited in any way, and the fixed portion 22 may be fixed to the fixing member 5 by various methods such as screwing or engagement. In this embodiment, when the fixing member 5 is a bolt, the fixed portion 22 is a member provided with a female thread that screws into the fixing member 5. The number and positions of the fixed portions 22 are not limited in any way, and in this embodiment, two fixed portions 22 are arranged spaced apart from each other in the first direction x.

[0032] The multiple guide portions 23 guide at least the first cutting blade 3 so that it can move relatively in the first direction x, and restrict at least the first cutting blade 3 from moving unduly in the second direction y. In this embodiment, the multiple guide portions 23 guide the first cutting blade 3 and the second cutting blade 4 so that they can move relatively in the first direction x, and restrict the first cutting blade 3 and the second cutting blade 4 from moving unduly in the second direction y. The specific configuration of the multiple guide portions 23 is not limited, and may be, for example, protrusions that protrude downward from the main body 21 in the third direction z. The multiple guide portions 23 may be multiple members fixed to the main body 21, or may be formed integrally with the main body 21. The number and arrangement of the multiple guide portions 23 are not limited, and in this embodiment, four guide portions 23 are arranged spaced apart in the first direction x.

[0033] The extension portion 24 is a portion that extends rearward from the main body portion 21 in the second direction y. The shape and size of the extension portion 24 are not limited in any way, and it may be rectangular when viewed in the third direction z and have an opening, for example. When the support member 2 is fixed to the drive portion 1, the extension portion 24 is inserted into the gap between the holding portion 11 and the holding portion 12 (the gap between the holding portion 11 and the support portion 13).

[0034] Two corners 26 protrude forward in the second direction y from both ends of main body 21 in the first direction x. When support member 2, first cutting blade 3, and second cutting blade 4 are attached to drive unit 1, one corner 26 is positioned outside first direction x with respect to first cutting blade 3 and second cutting blade 4.

[0035] As shown in FIGS. 2 to 5 , the fixing member 5 is used to fix the support member 2 to the drive unit 1. The specific configuration of the fixing member 5 is not limited in any way. In this embodiment, as described above, the fixing member 5 may be a bolt. The number of fixing members 5 is not limited in any way, and two fixing members 5 are used in this embodiment. The fixing member 5 is inserted into the through hole 111 from above in the third direction z and screwed into the fixed portion 22 of the support member 2, thereby fixing the support member 2. In this embodiment, the lower end of the fixing member 5 in the third direction z remains within the fixed portion 22 or near the lower end of the fixed portion 22 in the third direction z, and does not protrude below the support member 2 in the third direction z.

[0036] The first cutting blade 3 is for cutting weeds and the like, and as shown in FIGS. 2 to 6, is supported on the support member 2 while overlapping the support member 2 so as to be movable relative to the support member 2 in the first direction x. In this embodiment, the first cutting blade 3 is disposed adjacent to and below the support member 2 in the third direction z. The specific configuration of the first cutting blade 3 is not limited in any way, and in this embodiment, the first cutting blade 3 has a first main portion 31, a plurality of first cutting portions 32, a first engaging portion 33, and a first guided portion 34. The first cutting blade 3 is formed, for example, from metal.

[0037] The first main portion 31 is a portion that extends elongately in the first direction x. The multiple first cutting edges 32 each protrude forward in the second direction y from the first main portion 31 and are arranged, for example, at equal intervals in the first direction x. There are no limitations on the number, shape, size, etc. of the multiple first cutting edges 32.

[0038] The first engagement portion 33 is a portion that engages with the first reciprocating drive unit 14 of the drive unit 1, thereby enabling the first cutting blade 3 to reciprocate in response to movement of the first reciprocating drive unit 14. The specific configuration of the first engagement portion 33 is not limited in any way. In this embodiment, the first engagement portion 33 is a portion that extends rearward in the second direction y from the first main portion 31 and has a recess that is recessed forward in the second direction y. In other words, the first engagement portion 33 is composed of two extension portions that protrude rearward in the second direction y from the first main portion 31. When the first cutting blade 3 and the support member 2 are attached to the drive unit 1, the first reciprocating drive unit 14 fits into the recess of the first engagement portion 33. In this embodiment, the first engagement portion 33 overlaps with the extension portion 24 when viewed in the third direction z.

[0039] The multiple first guided portions 34 are portions that are guided by the multiple guide portions 23 of the support member 2. The number and specific configuration of the first guided portions 34 are not limited in any way, and in this embodiment, four first guided portions 34 are provided, each of which is an elongated hole with the first direction x as its longitudinal direction. By inserting the multiple guide portions 23 individually into the multiple first guided portions 34, the first cutting blade 3 is guided to be movable relative to the support member 2 in the first direction x, and unwarranted movement in the second direction y is restricted. Unlike this embodiment, the first guided portions 34 may be formed, for example, by the front ends of the first main portions 31 in the second direction y between adjacent first cutting portions 32.

[0040] The second cutting blade 4 is for cutting weeds and the like by intersecting with the first cutting blade 3, and as shown in FIGS. 2 to 6 , is supported on the support member 2 so as to be movable relative to the support member 2 in the first direction x while overlapping the support member 2 and the first cutting blade 3. In this embodiment, the second cutting blade 4 is disposed adjacent to and below the first cutting blade 3 in the third direction z. The specific configuration of the second cutting blade 4 is not limited in any way, and in this embodiment, the second cutting blade 4 has a second main portion 41, a plurality of second cutting portions 42, a second engaging portion 43, and a second guided portion 44. The second cutting blade 4 is formed, for example, from metal.

[0041] The second main portion 41 is a portion that extends elongately in the first direction x. The multiple second cutting edges 42 each protrude forward in the second direction y from the second main portion 41 and are arranged, for example, at equal intervals in the first direction x. There are no limitations on the number, shape, size, etc. of the multiple second cutting edges 42.

[0042] The second engagement portion 43 is a portion that engages with the second reciprocating drive unit 15 of the drive unit 1, thereby enabling the second cutting blade 4 to reciprocate in response to movement of the second reciprocating drive unit 15. The specific configuration of the second engagement portion 43 is not limited in any way. In this embodiment, the second engagement portion 43 is a portion that extends rearward in the second direction y from the second main portion 41 and has a recess that is recessed forward in the second direction y. In other words, the second engagement portion 43 is composed of two extension portions that protrude rearward in the second direction y from the second main portion 41. When the second cutting blade 4 is attached to the drive unit 1 together with the support member 2 and the first cutting blade 3, the second reciprocating drive unit 15 fits into the recess of the second engagement portion 43. In this embodiment, the second engagement portion 43 overlaps with the extension portion 24 and the first engagement portion 33 when viewed in the third direction z.

[0043] The second guided portions 44 are portions that are guided by the guide portions 23 of the support member 2. The number and specific configuration of the second guided portions 44 are not limited in any way. In this embodiment, four second guided portions 44 are provided, each of which is an elongated hole with the first direction x as its longitudinal direction. By inserting the guide portions 23 individually into the second guided portions 44, the second cutting blade 4 is guided to be movable in the first direction x relative to the support member 2 and the first cutting blade 3, and unwarranted movement in the second direction y is restricted. Unlike this embodiment, the second guided portions 44 may be formed, for example, by the front ends of the second main portions 41 in the second direction y between adjacent second cutting portions 42.

[0044] As shown in FIG. 5 , when the support member 2, the first cutting blade 3, and the second cutting blade 4 are attached to the drive unit 1, the support member 2 is fixed by two fixing members 5. The fixing member 5 does not reach the first cutting blade 3 and the second cutting blade 4 in the third direction z. The first cutting blade 3 and the second cutting blade 4 are positioned between the support member 2 and the support member 13, thereby defining their positions in the third direction z. Furthermore, the first cutting blade 3 and the second cutting blade 4 are guided by a plurality of guide members 23, and are movable relative to the drive unit 1 (support member 13) and the support member 2 in the first direction x, but are restricted from moving in the second direction y, preventing them from moving forward in the second direction y.

[0045] As shown in FIG. 3 , when the first cutting blade 3 and the second cutting blade 4 are removed from the drive unit 1 for replacement or other reasons, the fixed relationship between the two fixing members 5 and the two fixed portions 22 of the support member 2 is released. In this embodiment, the fixing member 5 is rotated in the direction opposite to the fastening direction to release the screw engagement between the fixing member 5 and the guide portion 23 and remove the fixing member 5. This releases the fixation of the support member 2 to the drive unit 1. However, even with the fixing member 5 removed, the guide portions 23 of the support member 2 still prevent the first cutting blade 3 and the second cutting blade 4 from moving in the second direction y relative to the support member 2. Therefore, when the support member 2 is moved forward in the second direction y relative to the drive unit 1, the first cutting blade 3 and the second cutting blade 4 move forward in the second direction y together with the support member 2. In this way, when the fixing member 5 is removed, the support member 2, the first cutting blade 3, and the second cutting blade 4 can be removed together forward in the second direction y. However, when the support member 2, the first cutting blade 3, and the second cutting blade 4 move forward in the second direction y beyond the support part 13, there is no member supporting the first cutting blade 3 and the second cutting blade 4 from below in the third direction z. Therefore, when the fixing member 5 is removed, the support member 2, the first cutting blade 3, and the second cutting blade 4 can be removed forward in the second direction y from the drive part 1, and the first cutting blade 3 and the second cutting blade 4 can be removed downward in the third direction z from the support member 2.

[0046] Next, the operation of the grass cutter A1 will be described.

[0047] According to this embodiment, when the fixing member 5 is removed, the support member 2 and the first cutting blade 3 can be detached from the drive unit 1, and the first cutting blade 3 can be detached from the support member 2. Therefore, even after the fixing member 5 is removed, there is no need to provide any parts that can support the first cutting blade 3 relative to the support member 2. This prevents an increase in the number of parts and weight of the brush cutter A1.

[0048] The brush cutter A1 further includes a second cutting blade 4. This allows it to more reliably cut weeds and the like. Furthermore, when the fixing member 5 is removed, the support member 2, the first cutting blade 3, and the second cutting blade 4 become detachable from the drive unit 1, and the first cutting blade 3 and the second cutting blade 4 become detachable from the support member 2. Therefore, even after the fixing member 5 is removed, there is no need to provide components that can support the first cutting blade 3 and the second cutting blade 4 relative to the support member 2. This prevents an increase in the number of components and weight of the brush cutter A1. Unlike the present embodiment, the second cutting blade 4 may be configured as a so-called fixed blade that does not move relative to the support member 2. In this case, the position of the second cutting blade 4 in the third direction z may be the same as that of the brush cutter A1, or, for example, the second cutting blade 4 may be located between the support member 2 and the first cutting blade 3.

[0049] The drive unit 1 includes a support portion 13. The support portion 13, together with the support member 2, is a member that sandwiches the first cutting blade 3 and the second cutting blade 4 in the third direction z. This allows the first cutting blade 3 and the second cutting blade 4 to be supported at appropriate positions in the third direction z.

[0050] 7 to 13 show other embodiments of the present invention. In these figures, elements that are the same as or similar to those in the above embodiment are given the same reference numerals. Furthermore, the configurations of the various parts in each of the modified examples and each of the embodiments can be combined with each other as appropriate within the scope of not causing technical contradictions.

[0051] 7 to 11 show a mower according to a second embodiment of the present invention. The mower A2 of this embodiment differs from the mower A1 in that it is provided with a restraining member 6.

[0052] The restraining member 6 is detachable from the support member 2 and the first cutting blade 3 and can restrain the relative positions of the support member 2 and the first cutting blade 3 when the support member 2 and the first cutting blade 3 are attached to the drive unit 1. In this embodiment, the restraining member 6 is detachable from the support member 2, the first cutting blade 3, and the second cutting blade 4 and can restrain the relative positions of the support member 2, the first cutting blade 3, and the second cutting blade 4 when the support member 2, the first cutting blade 3, and the second cutting blade 4 are attached to the drive unit 1. In addition to its restraining function, the restraining member 6 may also function as a protective cover, for example, by covering the first cutting blade 3, the second cutting blade 4, etc. The restraining member 6 may be composed of a single member or multiple members. In this embodiment, the restraining member 6 has an upper cover 61 and a lower cover 62. The upper cover 61 and the lower cover 62 may be connected to each other or may be separate. In the illustrated example, the restraining member 6 further includes a hinge portion 63 and a locking portion 64. There are no particular restrictions on the material of the restraining member 6, and the restraining member 6 may be made of resin, metal, or the like.

[0053] The upper cover 61 is a portion that covers the support member 2, the first cutting blade 3, and the second cutting blade 4 from above in the third direction z. The lower cover 62 is a portion that covers the support member 2, the first cutting blade 3, and the second cutting blade 4 from below in the third direction z. The hinge portion 63 is a portion that rotatably connects the upper cover 61 and the lower cover 62 to each other. In other words, the upper cover 61 and the lower cover 62 can be opened and closed by the hinge portion 63. The lock portion 64 is a portion that secures the upper cover 61 and the lower cover 62 to each other when the upper cover 61 and the lower cover 62 are closed.

[0054] In this embodiment, the restraint member 6 has recesses 65 and 66. As shown in FIG. 8, the recesses 65 are portions of the upper cover 61 recessed forward in the second direction y. When the restraint member 6 is attached, the recesses 65 are positioned so that the holding portions 11 fit into them. As shown in FIG. 9, the recesses 66 are portions of the lower cover 62 recessed forward in the second direction y. When the restraint member 6 is attached, the recesses 66 are positioned so that the support portions 13 fit into them.

[0055] The configuration of the grass cutter A2 other than the restraining member 6 may be the same as that of the grass cutter A1, for example.

[0056] 7 to 10, when the restraining member 6 is attached to the drive unit 1 with the support member 2, the first cutting blade 3, and the second cutting blade 4 attached, the relative positions of the support member 2, the first cutting blade 3, and the second cutting blade 4 can be restrained by the restraining member 6. However, in this state, the restraining member 6 is not directly fixed to the drive unit 1, but is indirectly fixed to the drive unit 1 via the support member 2.

[0057] 11, when the two fixing members 5 are removed in the same manner as in the brush cutter A1, the support member 2 is released from the drive unit 1. Accordingly, the restraining member 6 is also released from the drive unit 1. Therefore, with the support member 2, the first cutting blade 3, and the second cutting blade 4 restrained by the restraining member 6, the restraining member 6, the support member 2, the first cutting blade 3, and the second cutting blade 4 can be detached from the drive unit 1.

[0058] According to this embodiment, by removing the fixing member 5 with the restraining member 6 attached, the support member 2, the first cutting blade 3, and the second cutting blade 4 can be detached from the drive unit 1 together with the restraining member 6 while the relative positions of the support member 2, the first cutting blade 3, and the second cutting blade 4 are restrained. Therefore, the replacement work of the support member 2, the first cutting blade 3, and the second cutting blade 4 can be performed more easily.

[0059] Restraint member 6 has an upper cover 61 and a lower cover 62, and is structured to cover first cutting blade 3 and second cutting blade 4. This makes it possible to protect first cutting blade 3 and second cutting blade 4. It also makes it possible to prevent the user from unintentionally touching first cutting portion 32 and second cutting blade 42.

[0060] Restraint member 6 has recess 65 and recess 66. This makes it possible to avoid interference between restraint member 6 and holding portion 11 and support portion 13 when restraint member 6 is attached with support member 2, first cutting blade 3, and second cutting blade 4 attached to drive portion 1.

[0061] The relative positions of the support member 2, the first cutting blade 3, and the second cutting blade 4 may be slightly adjustable while they are restrained by the restraining member 6. That is, the support member 2, the first cutting blade 3, and the second cutting blade 4 may be restrained to the extent that they are prevented from moving apart in the third direction z, while the relative positions of the support member 2, the first cutting blade 3, and the second cutting blade 4 in the first direction x may be adjustable. This allows, with the restraining member 6 attached, the alignment of the first engaging portion 33 of the first cutting blade 3 with the first reciprocating drive unit 14 or the alignment of the second engaging portion 43 of the second cutting blade 4 with the second reciprocating drive unit 15 to be appropriately performed when attaching the support member 2, the first cutting blade 3, and the second cutting blade 4 to the drive unit 1.

[0062] 12 shows a brush cutter according to a third embodiment of the present invention. In the brush cutter A3 of this embodiment, the positional relationship in the third direction z between the support member 2, first cutting blade 3, and second cutting blade 4 is set to be the opposite of that of the brush cutter A1. That is, the first cutting blade 3 is positioned above the support member 2 in the third direction z, and the second cutting blade 4 is positioned above the first cutting blade 3 in the third direction z.

[0063] Furthermore, the positional relationship in the third direction z of the holding unit 11, the holding unit 12, the support unit 13, the first reciprocating drive unit 14, the second reciprocating drive unit 15 and the two fixing members 5 is set to be the opposite of that of the brush cutter A1, corresponding to the positional relationship between the support member 2, the first cutting blade 3 and the second cutting blade 4. That is, in this embodiment, the fixing member 5 is attached and detached from below in the third direction z.

[0064] This embodiment also makes it possible to suppress an increase in the number of parts and weight of the brush cutter A3. Furthermore, as can be understood from this embodiment, there are no limitations on the vertical relationship of each part in the third direction z.

[0065] 13 shows a brush cutter according to a fourth embodiment of the present invention. The brush cutter A4 of this embodiment does not have the second cutting blade 4 of the brush cutter A1. Correspondingly, the drive unit 1 has a first reciprocating drive unit 14, but does not have a second reciprocating drive unit 15.

[0066] Similar to the brush cutter A1, the first cutting blade 3 is supported on the support member 2 so as to be movable in the first direction x relative to the support member 2. In this embodiment, the first cutting blade 3 is the only blade that reciprocates when driven by the drive unit 1.

[0067] In this embodiment, the support member 2 may have a plurality of fixed blades 27. Each of the plurality of fixed blades 27 protrudes forward from the main body 21 in the second direction y.

[0068] In the brush cutter A4, when the fixing member 5 is removed, the support member 2 and the first cutting blade 3 become detachable from the drive unit 1, and the first cutting blade 3 becomes detachable from the support member 2 downward in the third direction z.

[0069] This embodiment also makes it possible to suppress an increase in the number of parts and weight of the brush cutter A4. Furthermore, as can be understood from this embodiment, the brush cutter according to the present invention may be configured to have only one reciprocating first cutting blade 3. By providing multiple fixed blade portions 27 on the support member 2, multiple first cutting blade portions 32 reciprocate relative to the multiple fixed blade portions 27. Therefore, compared to a brush cutter that has only multiple first cutting blade portions 32 of the first cutting blade 3 and does not have multiple fixed blade portions 27, it can more reliably cut weeds and the like. Note that, unlike the brush cutter A4, the brush cutter may not have multiple fixed blade portions 27.

[0070] The grass cutter according to the present invention is not limited to the above-described embodiment, and the specific configuration of each part of the grass cutter according to the present invention can be freely modified in various ways. [Explanation of symbols]

[0071] A1, A2, A3, A4: Grass cutter 1: Drive unit 2: Support member 3: 1st cutting blade 4:Second cutting blade 5: Fixing member 6: Restraining member 9: Operation stick 11,12: Holding part 13: Support part 14: First reciprocating drive unit 15: Second reciprocating drive unit 16: Fixing member 21: Main body 22: Fixed part 23: Guide section 24:Extension part 26: Corner 27: Fixed blade part 31: First main part 32: 1st blade part 33: First engagement portion 34: First guided part 41: Second main part 42: 2nd blade part 43: Second engagement portion 44: Second guided part 61: Upper cover 62: Lower cover 63: Hinge part 64: Rock section 65,66: Recess 91,92:Handle 93: Switch 94: Battery 111: Through hole 121: Structure part 122: Cover part 131: Fixed part x :1st direction y: second direction z: 3rd direction

Claims

1. A drive unit; a support member and a first cutting blade that are detachably attached to the drive unit; a fixing member that fixes the support member to the drive unit, the drive unit has a first reciprocating drive unit that reciprocates in a first direction, the support member has a main body portion, a fixed portion fixed by the fixing member, and a guide portion, the first cutting blade has a first main portion extending in the first direction, a plurality of first cutting edges each protruding from the first main portion, a first engaging portion engaging with the first reciprocating drive portion, and a first guided portion guided by the guide portion, and is supported on the support member in a state where it is overlapped with the support member and is movable relative to the support member in the first direction; When the fixing member is removed, the support member and the first cutting blade become detachable from the drive unit, and the first cutting blade becomes detachable from the support member.

2. the drive unit further includes a second reciprocating drive unit that reciprocates in the first direction, the second cutting blade further includes a second main portion extending in the first direction, a plurality of second blade portions each protruding from the second main portion, a second engaging portion engaging with the second reciprocating drive portion, and a second guided portion guided by the guide portion, and is supported so as to be movable in the first direction relative to the support member and the first cutting blade while being overlapped with the support member and the first cutting blade, The brush cutter according to claim 1, wherein when the fixing member is removed, the support member, the first cutting blade, and the second cutting blade can be detached from the drive unit, and the first cutting blade and the second cutting blade can be detached from the support member.

3. The brush cutter according to claim 1 , wherein the support member further includes a plurality of fixed blade portions each protruding from the main body portion.

4. The brush cutter according to claim 1 , wherein the drive unit has a support unit located on an opposite side of the first cutting blade from the support member.

5. A drive unit; a support member and a first cutting blade that are detachably attached to the drive unit; a fixing member that fixes the support member to the drive unit, the drive unit has a first reciprocating drive unit that reciprocates in a first direction, the first cutting blade is engaged with the first reciprocating drive unit and is supported so as to be movable relative to the support member in the first direction; When the fixing member is removed, the support member and the first cutting blade can be detached from the drive unit, and the first cutting blade can be detached from the support member; a restraining member that is detachable from the support member and the first cutting blade and that is capable of restraining the relative positions of the support member and the first cutting blade when the support member and the first cutting blade are attached to the drive unit, When the fixing member is removed with the restraining member attached, the support member and the first cutting blade can be detached from the drive unit while being restrained by the restraining member.

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