Brush cutter and cord reel cassette for use with brush cutter

Abstract

Provided is a technology for preventing the cord cutter from being pulled outward and pulled out to an unintended length due to centrifugal force acting on the cord cutter while the brush cutter is in operation. In the brush cutter 10, the two cord reel cassettes 100 rotate integrally with the cover member 70 (upper cover 72 and lower cover 73). However, since the two cord reel cassettes 100 are fixed to a fixing member 80, the cord reel cassettes 100 cannot rotate freely inside the cover member 70. As the cord reel cassette 100 rotates, centrifugal force acts on the nylon cord 200, but since the cord reel cassette 100 cannot rotate freely, there is no risk of the nylon cord 200 being pulled out by the centrifugal force.

Description

[Technical field]

[0001] The present invention relates to a cord reel cassette that can be attached to a brush cutter, and to a brush cutter. [Background technology]

[0002] Conventionally, there is known a brush cutter (also called a grass cutter) that has a motor, a shaft, and a rotary saw, and that allows a user to cut grass or small trees by operating a handle fixed to the shaft. In some cases, a thick resin cord such as a nylon cord is attached to the rotor part where the rotary saw is attached, and the brush cutter is used as a cord cutter for cutting grass along edges (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7282425 Summary of the Invention [Problem to be solved by the invention]

[0004] The brush cutter invented by the present inventor and described in Patent Document 1 is configured to rotate two cord cutters to cut grass. These two cord cutters are wound on separate cord reel cassettes. The brush cutter described in Patent Document 1 has two cord adjustment mechanisms for independently adjusting the lengths of the two cord cutters pulled out from the two cord reel cassettes.

[0005] In the brush cutter described in Patent Document 1, the two cord reel cassettes are configured to be able to rotate freely inside the housing of the cover member when the brush cutter is in operation. The lengths of the two cord cutters pulled out from the two cord reel cassettes are adjusted by two cord adjustment mechanisms. When the brush cutter is in operation, centrifugal force acts on the cord cutters. However, the cord adjustment mechanism prevents the cord cutters from being pulled outward by the centrifugal force and pulled out to an unintended length. Therefore, in normal use, the two cord cutters are not pulled out to an unintended length by the centrifugal force.

[0006] However, the inventors have discovered a problem in that if a malfunction occurs in the cord adjustment mechanism and the force with which the cord adjustment mechanism secures the cord cutter weakens, the cord cutter cannot be secured against the centrifugal force acting on the cord cutter, and the two cord cutters are pulled out to an unintended length due to the centrifugal force.

[0007] The present invention is made to solve the above-mentioned problems found by the inventor, and has as its object to provide a technology for preventing the cord cutters from being pulled outward and pulled out to an unintended length due to the centrifugal force acting on the cord cutters while the brush cutter is in operation, in a brush cutter that uses two cord cutters. [Means for solving the problem]

[0008] According to an embodiment of the present invention, two independent cords are wound around each of the cords. The brush cutter is configured so that the cord reel cassette can be attached. hand, A rod having a handle; A rotating shaft disposed at one end of the rod; A drive source that applies a driving force to the rotating shaft to rotate it; a cover member that is fixed to the rotating shaft and configured to rotate with the rotation of the rotating shaft, and has a hollow accommodation chamber therein for accommodating the two cord reel cassettes; A plate-shaped main body portion and an engagement portion provided on the plate-shaped main body portion, The two cord reel cassettes are prevented from rotating relative to the main body. The two cord reel cassettes are engaged with the engagement receiving portions provided thereon. vinegar a fixing member having an engagement portion; a locking mechanism provided on the cover member and the fixed member, the locking mechanism being configured to move the fixed member to a first position where the fixed member rotates independently of the cover member and a second position where the fixed member rotates integrally with the cover member; When the brush cutter is in operation and the fixing member is located at the second position, the two cord reel cassettes are attached to the fixing member in the housing chamber of the cover member. Does not rotate relative to In this state, the fixing member and the cover member rotate together, A brush cutter is provided in which, when the fixing member is in a first position, the two cord reel cassettes and the fixing member rotate relative to the cover member, thereby making it possible to adjust the length of the cord wound around the two cord reel cassettes. Effect of the Invention

[0009] In the brush cutter of the present invention, when the fixing member is located at the second position during operation of the brush cutter, the two cord reel cassettes rotate integrally with the cover member. However, since the two cord reel cassettes are fixed to the fixing member, the cord reel cassettes are prevented from rotating freely in the storage chamber inside the cover member. Therefore, even if centrifugal force acts on the cord as the cord reel cassette rotates, the cord reel cassette cannot rotate freely, so there is no risk of the cord being pulled out to an unintended length due to the centrifugal force. Furthermore, when the fixing member is located at the first position, the two cord reel cassettes and the fixing member are rotatable relative to the cover member, so the cord can be easily pulled out from the two cord reel cassettes. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram of a brush cutter 10. [Diagram 2] Fig. 2 is a schematic explanatory diagram of the upper cover 72, the lower cover 73, and the cord reel cassette 100. In Fig. 2, in order to make the drawing easier to see, the cross section of the cord reel cassette 100 is not shaded. [Diagram 3] FIG. 3 is a schematic explanatory diagram of the cord reel cassette 100. [Figure 4] FIG. 4 is a schematic explanatory diagram of the fixing member 80. As shown in FIG. [Diagram 5] FIG. 5 is a schematic explanatory diagram for explaining the recess 731 provided in the lower cover 73. As shown in FIG. [Figure 6] FIG. 6 is a schematic explanatory diagram for explaining a recess 102a as an example of an engagement receiving portion and a protrusion 80P as an example of an engagement portion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The brush cutter 10 according to the present invention will be described with reference to the drawings. In the following description, the upper side, lower side, left side, and right side will be defined as shown in FIG.

[0012] As shown in FIG. 1, the brush cutter 10 mainly comprises a cylindrical rod 20, a rotating shaft 30 (see FIG. 2) provided at one end (lower end) of the rod 20, a drive unit 40 provided at the end (upper end) of the rod 20 opposite the rotating shaft 30, a handle 50 provided on the side of the rod 20 closer to the drive unit 20, a guard 60 provided on the side of the rod 20 closer to the rotating shaft 30, a cover member 70 that houses a cord reel cassette 100 (see FIG. 2), and a fixing member 80 (see FIG. 2) that fixes the cord reel cassette 100 to the cover member 70.

[0013] The cylindrical rod 20 is a hollow metal pipe with a length of about 1500 mm to 1700 mm, and has a driving unit 40 attached to its upper end. The driving unit 40 includes a motor 41 and a battery 42 for supplying power to the motor 41. A rotating shaft 30 (see FIG. 2) is provided at the lower end of the rod 20, and the rotating shaft 30 is configured to rotate by a rotational driving force transmitted from a rotating shaft 43 of the motor 41 via a transmission mechanism (not shown).

[0014] The handle 50 (see FIG. 1) is a handle for a user to grip the brush cutter 10, and has a generally U-shape. A switch 51 that is linked to the motor 41 is attached to one end of the handle 50. While the user turns on the switch 51, the motor 41 is driven to rotate the rotating shaft 43 and the rotating shaft 30.

[0015] As shown in FIG. 2, the cover member 70 includes an upper cover 72 and a lower cover 73. In this embodiment, the upper cover 72 and the lower cover 73 of the cover member 70 are metal cover members. The upper cover 72 includes a substantially cylindrical side wall 721 and a circular upper wall 722 that covers the upper part of the side wall 721. The side wall 721 of the upper cover 72 is formed with two guide holes 723 for removing the nylon cord 200 of the cord reel cassette 100. The central part of the upper wall 722 is formed with a through hole 722h through which the rotating shaft 30 is inserted. The rotating shaft 30 is inserted through the through hole 722h of the upper cover 72, and the upper cover 72 is fixed to the rotating shaft 30 by a fastening member 71 such as a nut.

[0016] The lower cover 73 is also a metal cover member like the upper cover 72, and has an opening 73h in the center. As shown in FIG. 5, a plurality of recesses 731 are provided so as to surround the periphery of the opening 73h. As described later, the plurality of recesses 731 fit into a plurality of protrusions 840 (see FIG. 4) provided on a main body 810 (see FIG. 4) of the fixing member 80. As shown in FIG. 2, the lower cover 73 is fixed below the upper cover 72 by screws or the like so as to cover the upper cover 72 from below. When the lower cover 73 is attached to the upper cover 72, a cylindrical space is formed inside the upper cover 72 and the lower cover 73 to accommodate two cord reel cassettes 100.

[0017] As described above, the upper cover 72 can be fixed to the rotating shaft 30 by the fastening member 71. Furthermore, the upper cover 72 and the lower cover 73 are fixed together by screws or the like. Therefore, not only the upper cover 72 but also the lower cover 73 rotates as the rotating shaft 30 rotates.

[0018] Next, the two cord reel cassettes 100 arranged inside the space formed by the upper cover 72 and the lower cover 73 will be described with reference to the drawings. As shown in FIG. 2, the two cord reel cassettes 100 are arranged one above the other in the vertical direction. The two cord reel cassettes 100 have the same configuration. As shown in FIG. 2, the cord reel cassette 100 has an upper wall 101, a lower wall 102, and a shaft portion 103 that connects the upper wall 101 and the lower wall 102 in the vertical direction. A nylon cord 200 is wound around each of the shaft portions 103 of the two cord reel cassettes 100. Although not shown, one end of the nylon cord 200 is fixed to the shaft portion 103 of the cord reel cassette 100. Therefore, the nylon cord 200 will not come off the cord reel cassette 100. 3, the shaft portion 103 of the cord reel cassette 100 is provided with four fitting grooves 104 that fit with four fixed shafts 820 (see FIG. 2) of the fixing member 80 described below. The four fitting grooves 104 are an example of an engagement receiving portion of the present invention, and the four fixed shafts 820 are an example of an engagement portion of the present invention.

[0019] 4, the fixing member 80 includes a substantially disk-shaped main body 810, a circular groove 811 provided substantially in the center of the main body 810, four fixing shafts 820 arranged around the groove 811, a pressing portion 830 protruding downward substantially in the center of the main body 810, a plurality of convex portions 840 surrounding the pressing portion 830, and a spring 850 (see FIG. 2). Note that, as shown in FIG. 2, the lower end of the spring 850 is inserted into the groove 811 of the fixing member 80.

[0020] As shown in FIG. 2, when two cord reel cassettes 100 are arranged vertically stacked, the bottom wall 102 of the upper cord reel cassette 100 and the top wall 101 of the lower cord reel cassette 100 may be in contact with each other, or may be arranged facing each other with a predetermined gap between them.

[0021] As shown in FIG. 2, the two nylon cords 200 pulled out from the cord reel cassette 100 are pulled out from two main body guide holes 723 provided in the side wall 721 of the upper cover 72.

[0022] Next, a method for replacing the cord reel cassette 100 in the brush cutter 10 according to the present invention will be described. When the brush cutter 10 is used to mow edge grass, the tip of the nylon cord 200 gradually wears away. The user can purchase a cord reel cassette 100 with the nylon cord 200 wound around it and replace it. Note that two cord reel cassettes 100 can also be replaced at the same time. It is also possible to replace only one of the two cord reel cassettes 100. The following description will be given taking an example of replacing two cord reel cassettes 100 at the same time.

[0023] When replacing, first remove the screws between the upper cover 72 and the lower cover 73, and remove the lower cover 73 from the upper cover 72. At this time, the fixing member 80 and the two cord reels 100 are also taken out together with the lower cover 73. Next, the two cord reel cassettes 100 to be replaced are lifted up and removed from the fixed shafts 820 of the fixing member 80. It is to be noted that the fixing member 80 can also be removed from the lower cover 73.

[0024] Next, a new cord reel cassette 100 is prepared and attached to the fixed member 80. At this time, the four fitting grooves 104 (see FIG. 3) of the shaft portion 103 of the cord reel cassette 100 are fitted onto the four fixed shafts 820 of the fixed member 80. This prevents the cord reel cassette 100 from freely rotating relative to the fixed member 80. In other words, the cord reel cassette 100 and the fixed member 80 rotate together. Next, with the fitting grooves 104 of the cord reel cassette 100 fitted onto the fixed shafts 820, the fixed member 80 is attached to the lower cover 73. At this time, the pressing portion 830 of the fixed member 80 is inserted into the opening 73h so that the pressing portion 830 protrudes downward from the opening 73h of the lower cover 73. At the same time, the convex portion 840 of the fixed member 80 is fitted into the concave portion 731 of the lower cover 73. With the fixing member 80 attached to the lower cover 73 in this manner, the lower cover 73 is fixed to the upper cover 72 with screws or the like. At this time, the upper end of the spring 850 of the fixing member 80 abuts against the upper wall 722 of the upper cover 72 in a state where the spring 850 is compressed from its natural length. Since the upper end of the spring 850 abuts against the upper wall 722 of the upper cover 72 in a state where the spring 850 of the fixing member 80 is compressed from its natural length, the fixing member 80 is biased downward, that is, toward the lower cover 73, by the spring 850. As described above, since the convex portion 840 of the fixing member 80 is fitted into the concave portion 731 of the lower cover 73, the fixing member 80 is biased toward the lower cover 73. As a result, the fixing member 80 is prevented from rotating independently of the lower cover 73, and the fixing member 80 and the lower cover 73 rotate together. In this manner, the position where the convex portion 840 of the fixing member 80 fits into the concave portion 731 of the lower cover 73 corresponds to the second position of the fixing member 80. Note that the combination of the convex portion 840 provided on the fixing member 80, the concave portion 731 provided on the lower cover 73, and the spring 850 is one example of the locking mechanism of the present invention.

[0025] As described above, the upper cover 72 is fixed to the rotating shaft 30 by a fastening member 71 such as a nut. The lower cover 73 is fixed to the upper cover 72 by a screw or the like. The fixing member 80 is fixed to the lower cover 73, and the lower cover 73 and the fixing member 80 rotate integrally. Furthermore, two cord reel cassettes 100 are fixed to the fixing member 80, and the fixing member 80 and the two cord reel cassettes 100 rotate integrally. As a result, as the rotating shaft 30 rotates, the upper cover 72, the lower cover 73, the fixing member 80, and the two cord reel cassettes 100 rotate integrally.

[0026] Next, a method for adjusting the length of the nylon cord 200 of the cord reel cassette 100 will be described. When the motor 41 is driven to rotate the rotating shaft 30, the two cord reel cassettes 100 also rotate integrally with the cover member 70 (upper cover 72 and lower cover 73) as described above, and the cord reel cassettes 100 cannot rotate freely inside the cover member 70. As the cord reel cassette 100 rotates, centrifugal force acts on the nylon cord 200. However, since the cord reel cassette 100 cannot rotate freely, there is no risk of the nylon cord 200 being pulled out by the centrifugal force. In contrast, when the rotating shaft 30 is rotating due to the drive of the motor 41, the pressing portion 830 of the fixing member 80 is pressed against the ground or the like so as to be lightly struck, thereby momentarily pressing the pressing portion 830 upward. If the upward pressing force at this time is greater than the downward biasing force of the spring 850, the fixing member 80 moves upward against the downward biasing force of the spring 850. At this time, the convex portion 840 of the fixing member 80 moves away from the concave portion 731 of the lower cover 73, and the fixing member 80 becomes able to rotate freely with respect to the lower cover 73. In this manner, the position where the convex portion 840 of the fixing member 80 moves away from the concave portion 731 of the lower cover 73 corresponds to the first position of the fixing member 80. When the fixing member 80 is in the first position, the fixing member 80 rotates due to inertia, and the nylon cord 200 is pulled out by centrifugal force. Note that the fixing member 80 moves upward instantaneously as the pressing portion 830 is pressed against the ground, and rotates with respect to the lower cover 73. However, immediately after that, the fixing member 80 moves downward due to the biasing force of the spring 850, and the convex portion 840 of the fixing member 80 fits into the concave portion 731 of the lower cover 73. This again prevents fixing member 80 from rotating independently of lower cover 73, and causes fixing member 80 and lower cover 73 to rotate together. In this way, nylon cord 200 is pulled out only while pressing portion 830 is momentarily moving upward by being pressed against the ground, so that no excess nylon cord 200 is pulled out, and the amount of nylon cord 200 pulled out can be adjusted by the number of times pressing portion 830 is pressed against the ground.

[0027] As described above, in the brush cutter 10 according to the present invention, the upper cover 72, the lower cover 73, the fixed member 80, and the two cord reel cassettes 100 rotate together as the rotating shaft 30 rotates. In detail, the convex portion 840 of the fixed member 80 fits into the concave portion 731 of the lower cover 73, and the fixed member 80 is biased toward the lower cover 73. This prevents the fixed member 80 from rotating independently of the lower cover 73, and the fixed member 80 and the lower cover 73 rotate together. Furthermore, the two cord reel cassettes 100 are fixed to the fixed member 80. As a result, the two cord reel cassettes 100 rotate together with the cover member 70 (the upper cover 72 and the lower cover 73), but the cord reel cassettes 100 cannot rotate freely inside the cover member 70 because they are fixed to the fixed member 80. As the cord reel cassette 100 rotates, centrifugal force acts on the nylon cord 200. However, since the cord reel cassette 100 cannot rotate freely, there is no risk of the nylon cord 200 being pulled out by the centrifugal force.

[0028] In the brush cutter 10 according to the present invention, when the tip of the nylon cord 200 is worn, as described above, when the rotating shaft 30 is rotating by the drive of the motor 41, the pressing portion 830 of the fixing member 80 is pressed against the ground or the like so as to momentarily press the pressing portion 830 upward. By such a simple operation, the nylon cord 200 can be easily pulled out. In addition, since the fixing member 80 is constantly biased toward the lower cover 73 by the spring 850, the fixing member 80 momentarily moves upward when the pressing portion 830 is pressed against the ground, and after rotating relative to the lower cover 73, it immediately moves downward due to the biasing force of the spring 850, and the convex portion 840 of the fixing member 80 fits into the concave portion 731 of the lower cover 73. This prevents the fixing member 80 from rotating independently of the lower cover 73 again, so that the nylon cord 200 is not pulled out excessively.

[0029] In the brush cutter 10 according to the present invention, since the nylon cord 200 is wound around the cord reel cassette 100, the user can easily replace the nylon cord 200 together with the cord reel cassette 100. In this case, since there is no need to wind a long nylon cord around the rotor of the brush cutter as in the conventional brush cutter, the user can save time and effort, and even a user who is not familiar with operating machines can easily replace the nylon cord. Furthermore, when a user wants to use a nylon cord of a different thickness, the user can replace the entire cord reel cassette 100, which significantly reduces the time and effort required for replacement compared to the conventional brush cutter. Furthermore, the two cord reel cassettes 100 are not integrated so as to be connected to each other, but can be removed and replaced individually. Therefore, the two cord reel cassettes 100 do not necessarily need to be replaced at the same time, and only one of them can be replaced, so that the cord can be used without waste.

[0030] In the brush cutter 10 according to the present invention, the replaceable cord reel cassette 100 is covered by the metallic upper cover 72 and lower cover 73, so that even if pebbles or the like fly up while cutting edge grass, there is no risk of them directly hitting the cord reel cassette 100. As a result, there is no need to form the cord reel cassette 100 from a metallic material, and it can be formed from a lightweight material such as plastic or resin, making it lightweight and inexpensive to form.

[0031] In the brush cutter 10 according to the present invention, two cord reel cassettes 100 are arranged in a storage chamber formed by the upper cover 72 and the lower cover 73 so that they can be removed individually. This allows the user to replace the cord reel cassettes 100 individually. Furthermore, the cord reel cassette 100 has an upper wall 101 and a lower wall 102 that face each other in the vertical direction. Therefore, even when two cord reel cassettes 100 are arranged one on top of the other, the lower wall 102 of one cord reel cassette 100 and the upper wall 101 of the other cord reel cassette 100 act as a barrier, preventing the two nylon cords 200 from becoming entangled.

[0032] The present invention is not limited to the above embodiment, and can be modified within the scope of the present invention. For example, the cord reel cassette 100 is wound with the nylon cord 200, but the cord does not necessarily have to be made of nylon, and can be made of other resins. The cover member 70 does not necessarily have to be a metal cover, and can be made of an appropriate material such as resin. In the above embodiment, the cord reel cassette 100 is a spool (winding frame) consisting of the upper wall 101, the lower wall 102, and the shaft portion 103, with the nylon cord 200 wound around it. However, the present invention is not limited to such an embodiment. As long as the cord reel cassette 100 has parts corresponding to the upper wall, the lower wall, and the shaft portion, the outer shape of the cord reel cassette 100 can be any appropriate shape.

[0033] In the above embodiment, when the rotating shaft 30 is rotated by the drive of the motor 41, the pressing portion 830 of the fixing member 80 is pressed against the ground or the like so as to be lightly struck, and the pressing portion 830 is pressed upward for an instant, thereby pulling out the nylon cord 200. However, the present invention is not limited to such an embodiment. For example, when the motor 41 is not driven, that is, when the rotating shaft 30 is not rotating, the user may press the pressing portion 830 so that the convex portion 840 of the fixing member 80 moves away from the concave portion 731 of the lower cover 73, and the fixing member 80 is rotated to pull out the nylon cord 200. In this case, the user can easily adjust the amount of nylon cord 200 pulled out by adjusting the amount of rotation of the fixing member 80. In addition, the pressing portion 830 of the fixing member 80 may be provided with a protrusion or a recess for the user to grip, so that the user can easily rotate the fixing member 80.

[0034] Furthermore, the brush cutter 10 of the present invention may be configured so that the nylon cord 200 is pulled out only when the user presses the pressing portion 830 of the fixing member 80 while the rotating shaft 30 is not rotating. For example, the height of the pressing portion 830 may be adjusted so that the pressing portion 830 does not protrude downward from the lower cover 73, or a barrier may be provided on the underside of the lower cover 73 that protrudes downward beyond the pressing portion 830 to prevent the pressing portion 830 from directly hitting the ground. In this way, it is possible to prevent the pressing portion 830 from being unintentionally pressed and the nylon cord 200 from being pulled out while the brush cutter 10 is being driven.

[0035] In the above embodiment, the fixed member 80 includes the fixed shaft 820 as an example of an engaging portion, and the shaft portion 103 of the cord reel cassette 100 includes the fitting groove 104 as an example of an engaging receiving portion. The aspects of the engaging portion and the engaging receiving portion of the present invention are not limited to such aspects. For example, as shown in FIG. 6, a recess 102a as an example of an engaging receiving portion may be provided on the bottom wall 102 of the cord reel cassette 100, and a protrusion 80P as an example of an engaging portion that fits into the recess 102a of the cord reel cassette 100 may be provided on the fixed member 80. Even in such a case, the cord reel cassette 100 can be fixed to the fixed member 80. Note that, when the bottom wall 102 of the cord reel cassette 100 includes the recess 102a as an example of an engaging receiving portion, a protrusion 101a that fits into the recess 102a may be provided on the top wall 101 of the cord reel cassette 100. As a result, when two cord reel cassettes 100 are stacked one on top of the other, the recessed portion 102a and the protruding portion 101a fit together, preventing the two cord reel cassettes 100 from freely rotating relative to each other.

[0036] In the above embodiment, the brush cutter 10 is provided with the battery 42 and is driven by electricity, but the present invention is not limited to this aspect and may be driven by, for example, an engine.

Claims

1. A brush cutter configured to be fitted with two independent cord reel cassettes, each with a different cord wound thereon, A rod having a handle; A rotating shaft disposed at one end of the rod; A drive unit that applies a driving force to the rotating shaft to rotate it; a cover member that is fixed to the rotating shaft and configured to rotate with the rotation of the rotating shaft, and that has a hollow accommodation chamber therein for accommodating the two cord reel cassettes; a fixing member having a plate-shaped main body and an engagement portion provided on the plate-shaped main body, the engagement portion engaging with an engagement receiving portion provided on the two cord reel cassettes so as to prevent the two cord reel cassettes from rotating relative to the main body; a locking mechanism provided on the cover member and the fixed member, the locking mechanism being configured to move the fixed member to a first position where the fixed member rotates independently of the cover member and a second position where the fixed member rotates integrally with the cover member; When the brush cutter is in operation and the fixing member is located in the second position, the two cord reel cassettes rotate integrally with the fixing member and the cover member without rotating relative to the fixing member in the accommodation chamber of the cover member, A brush cutter characterized in that, when the fixing member is in a first position, the two cord reel cassettes and the fixing member rotate relative to the cover member, thereby making it possible to adjust the length of the cord wound around the two cord reel cassettes.

2. The lock mechanism includes a pair of a protrusion provided on the fixing member and a recess provided on the cover member, or a pair of a recess provided on the fixing member and a protrusion provided on the cover member; The brush cutter according to claim 1 , further comprising: a biasing member that biases the fixing member toward the cover member.

3. The brush cutter according to claim 2, wherein the biasing member of the locking mechanism is configured to bias the fixing member towards the cover member.

4. 2. The brush cutter according to claim 1, wherein the cord reel cassette is removably accommodated in the accommodation chamber of the cover member, The housing has an upper wall and a lower wall that face each other in a vertical direction, and a shaft portion that connects a center portion of the upper wall and a center portion of the lower wall in a vertical direction, A cord reel cassette characterized in that the shaft portion or the lower wall is provided with an engagement receiving portion configured to engage with the engagement portion of the fixing member.