Work equipment

Abstract

To achieve downsizing of a discharge mechanism.SOLUTION: In a discharge mechanism 50, an opening / closing cover 54 is provided at a saw cover 24 in a manner that the opening / closing cover 54 can open or close an attachment opening 24C of a discharge body part 24B. In a closed state of the opening / closing cover 54, an outlet opening 24D of a discharge part 52 is open to a right side and discharges processing pieces from the outlet opening 24D. On the other hand, the opening / closing cover 54 is turned in an open state and a dust adapter 60 is attached to the discharge body part 24B to discharge processing pieces, entering the dust adapter 60 from an inlet opening part 24E of the saw cover 24, from an adapter discharge part 62 to a rear side. Thus, in a circular saw 10, the discharge mechanism 50 which switches a processed piece discharge direction is consolidated at a rear part of the saw cover 24. The structure allows downsizing of the discharge mechanism 50 and contributes to downsizing of a physical constitution of the circular saw 10.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a working machine.

Background Art

[0002] In the working machine described in Patent Document 1 below, a cylindrical connecting tubular portion is provided at the front portion of a saw cover that covers a circular saw blade. An attachment is detachably attached to the connecting tubular portion, and a hose member for connecting a dust collector is connected to the attachment. Further, a rear discharge port is provided at the rear portion of the saw cover. Furthermore, an opening / closing member is provided on the saw cover, and the front discharge port, which is the opening of the connecting tubular portion, is opened and closed by the opening / closing member.

[0003] When the hose member for connecting a dust collector is connected to the attachment, by setting the opening / closing member in the open state, the processed pieces generated during cutting can be discharged from the front discharge port and collected by a dust collector or the like. On the other hand, when the hose member for connecting a dust collector is not connected to the attachment, by setting the opening / closing member in the closed state, the processed pieces generated during cutting can be discharged from the rear discharge port.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the above-mentioned work machine has room for improvement in the following respects. Specifically, the saw cover is provided with a front discharge port (connecting tubular section) and a rear discharge port, and an attachment is fixed to the connecting tubular section. In other words, the saw cover needs to have two discharge ports, which increases the size of the discharge mechanism for discharging the processed material. Therefore, it is desirable to miniaturize the discharge mechanism for discharging the processed material in the work machine.

[0006] The present invention aims to provide a work machine that can miniaturize the processing piece discharge mechanism, taking the above facts into consideration. [Means for solving the problem]

[0007] One or more embodiments of the present invention include a motor and a device driven by the motor, Circular saw blade An output shaft to which the motor is attached, and a housing for the motor and cover a part of the circular saw blade. A housing; a discharge section provided in the housing for discharging processed material generated during processing from the inside to the outside of the housing; a cover that, when operated, can be in a closed state that closes a part of the discharge section or in an open state that opens a part of the discharge section; an attachment member connected to the discharge section in the open state for discharging or collecting processed material from the discharge section; and a connection between the cover, the attachment member and the housing. Movable Established It comprises a fixing portion and an engaging portion provided on the other side of the cover and the attachment member and the housing, When the memory is closed The fixing portion is the engaged portion By engaging the cover but Fixed to the aforementioned housing So When attaching the attachment member, The fixed part is the engaged part By engaging with the attachment member but Fixed to the aforementioned housing When operated, the fixing portion moves to a fixed position where it engages with the engaged portion, or to a released position where it is released from engagement with the engaged portion. It is a work machine.

[0008] One or more embodiments of the present invention provide the fixing portion to be movably provided in the housing, and the cover and the attachment member have recorded The engaging portion is integrally formed There are It is a work machine.

[0009] One or more embodiments of the present invention are a work machine in which a pair of mounting pieces are provided on the outer periphery of the housing, protruding from the housing to one side in a first direction and arranged opposite to a second direction perpendicular to the first direction, the fixing portion is arranged between the pair of mounting pieces and is rotatably supported on the mounting pieces with the second direction as the axial direction, and engages with the engaged portion, and includes an operating portion arranged on one side of the engaging portion in a third direction perpendicular to the first and second directions, and the fixing portion rotates from the fixed position to the unlocked position when the operating portion is pulled to one side in the first direction.

[0010] One or more embodiments of the present invention are work machines in which the engaged portion is located between a pair of mounting pieces and on one side of the engaged portion in the first direction.

[0011] One or more embodiments of the present invention are work machines in which, when the cover is closed, the engaging portion is covered by a part of the cover from the other side in the third direction.

[0012] One or more embodiments of the present invention are work machines in which, when the attachment member is mounted, the engaging portion is covered from the other side in the third direction by a part of the attachment member.

[0013] One or more embodiments of the present invention are a work machine in which the housing has a pair of support parts that rotatably support the cover and are spaced apart in the second direction, and a locking part for locking the attachment member, wherein the locking part is located between the pair of support parts.

[0014] One or more embodiments of the present invention are work machines in which the fixing portion includes a shaft portion connected to the housing so as to be axially movable, and an operation portion provided at one end of the shaft portion. In the fixed position, the engaged portion is axially sandwiched by the operation portion and the housing, and in the released position, the sandwiching state of the engaged portion by the operation portion and the housing is released.

[0015] One or more embodiments of the present invention are work machines in which the shaft portion and the housing are screwed together.

[0016] One or more embodiments of the present invention ,before The chip discharge portion has an inlet opening that opens in the circumferential tangential direction of the outer periphery of the circular saw blade, and an outlet opening that opens to one side in the plate thickness direction of the circular saw blade. In the attached state of the attachment member, the attachment member is arranged in the rotation direction of the circular saw blade with respect to the inlet opening.

[0017] One or more embodiments of the present invention are work machines in which the cover is rotatable about a support portion provided on the housing, and the fixing portion is located downstream of the support portion in the direction in which the workpiece flows.

[0018] One or more embodiments of the present invention ,before The housing has a saw cover that covers an upper part of the circular saw blade, and the support portion is provided above the saw cover.

[0019] One or more embodiments of the present invention are work machines capable of performing a cutting operation by advancing the rotating circular saw blade forward, and the support portion is located behind the rotation center of the circular saw blade.

[0020] One or more embodiments of the present invention ,timesIt is possible to perform a cutting operation by advancing the circular saw blade before rotation. The housing has a saw cover that covers a part of the upper side of the circular saw blade. The discharge part is configured to discharge the processed pieces along the tangential direction of the circular saw blade when the cover is in the open state. The fixing part is a working machine supported by the housing at a position below the upper end of the circular saw blade or below the discharge part.

[0021] One or more embodiments of the present invention are the working machine described in which the cover is configured to cover a part of the discharge part in a posture that slopes downward from the front to the rear in the closed state.

Effect of the Invention

[0022] According to one or more embodiments of the present invention, the discharge mechanism for the processed pieces can be miniaturized.

Brief Description of the Drawings

[0023] [Figure 1] There is a side view seen from the right showing the circular saw according to the first embodiment. [Figure 2] It is a perspective view seen from the upper right rear of the circular saw shown in FIG. 1. [Figure 3] It is a cross-sectional view seen from the right of the discharge mechanism shown in FIG. 1. [Figure 4] It is a partially cut-away side view showing the state where the opening / closing cover of the discharge mechanism shown in FIG. 1 is in the closed position. [Figure 5] It is a side view showing the state where a dust adapter is attached to the discharge mechanism shown in FIG. 1. [Figure 6] It is a cross-sectional view seen from the right of the discharge mechanism shown in FIG. 5. [Figure 7] It is a cross-sectional view seen from the front of the discharge mechanism shown in FIG. 5 (cross-sectional view taken along line 7-7 of FIG. 5). [Figure 8] It is a perspective view seen from the upper left rear showing the state where the dust adapter is removed from the discharge mechanism of the circular saw according to the second embodiment. [Figure 9]Figure 8 is a perspective view showing the discharge mechanism with its opening / closing cover in the closed position. [Figure 10] Figure 8 is a perspective view showing the dust adapter attached to the discharge mechanism. [Figure 11] This is a perspective view from the left rear, showing the circular saw discharge mechanism according to the third embodiment with the dust adapter removed. [Figure 12] Figure 11 is a perspective view showing the discharge mechanism with its opening / closing cover in the closed position. [Figure 13] Figure 11 is a perspective view showing the dust adapter attached to the discharge mechanism. [Modes for carrying out the invention]

[0024] (First Embodiment) The circular saw 10 as a work machine according to the first embodiment will be described below with reference to Figures 1 to 7. The arrows UP, FR, and RH shown in the drawings indicate the upper, front, and right sides of the circular saw 10, respectively. In the following description, when using the directions of up / down, front / back, and left / right, they refer to the up / down, front / back, and left / right directions of the circular saw 10, unless otherwise specified. The front / back direction corresponds to the first direction of the present invention, the left / right direction corresponds to the second direction of the present invention, and the up / down direction corresponds to the third direction of the present invention.

[0025] As shown in Figures 1 and 2, the circular saw 10 is configured as an electric tool for cutting workpieces. The circular saw 10 consists of a base 12 and a circular saw body 20. The circular saw 10 also has a discharge mechanism 50 for discharging the workpiece generated during cutting to the outside of the circular saw body 20. The components of the circular saw 10 will be described below.

[0026] (Regarding Base 12) The base 12 is made of metal and is formed in the shape of a roughly rectangular plate with the vertical direction being the thickness direction and the front-to-back direction being the longitudinal direction. When the circular saw 10 is cutting, the base 12 is placed on the workpiece and the base 12 is moved forward. An insertion part 12A for positioning the circular saw blade 14 as the tip tool is formed through the right side of the base 12. The insertion part 12A is formed in the shape of a roughly rectangular shape with the front-to-back direction being the longitudinal direction. Here, the circular saw blade 14 is formed in the shape of a roughly circular disc with the left-to-right direction being the thickness direction, and the center of the circular saw blade 14 is fixed to the output shaft 44 of the drive mechanism 40, which will be described later, so as to be able to rotate integrally. The circular saw blade 14 is positioned in the insertion part 12A, with the upper part of the circular saw blade 14 protruding upward from the base 12, and the lower end part of the circular saw blade 14 protruding downward from the base 12.

[0027] (Regarding the circular saw body 20) The circular saw body 20 consists of a housing 22, a battery 30, and a drive mechanism 40.

[0028] (Regarding Housing 22) The housing 22 is composed of multiple housing members and forms the outer casing of the circular saw body 20, and is positioned above the base 12. The housing 22 includes a saw cover 24 that covers the circular saw blade 14 (broadly understood as an element of a tool cover), a motor housing 26 that houses the drive mechanism 40 described later, and a battery holder 28 to which the battery 30 is mounted.

[0029] The saw cover 24 constitutes the right end of the housing 22. The saw cover 24 is formed in a roughly semi-circular disc shape with its thickness in the left-right direction and convex upwards, and concave downwards. The upper part of the circular saw blade 14 is housed inside the saw cover 24 and covered by the saw cover 24. As a result, during cutting, the processed material rolled up from the front end of the circular saw blade 14 flows to the rear side along the upper end of the saw cover 24 inside the saw cover 24. The front end of the saw cover 24 is connected to the base 12 by a front connecting mechanism 16, and the rear end of the saw cover 24 is connected to the base 12 by a rear connecting mechanism 18. In detail, the saw cover 24 and the base 12 are connected via a link member of a well-known cutting depth adjustment mechanism. In this way, the circular saw body 20 is connected to the base 12.

[0030] The saw cover 24 is divided into two parts in the left-right direction. The saw cover member 24L, which constitutes the left portion of the saw cover 24, is made of metal, while the saw cover member 24R, which constitutes the right portion of the saw cover 24, is made of resin.

[0031] As shown in Figures 3 and 4, a discharge body portion 24B is formed on the outer circumference of the upper end at the rear of the saw cover 24. The discharge body portion 24B has a structure that is recessed downwards (recessed radially inwards). Together with the opening / closing cover 54, which will be described later, the discharge body portion 24B constitutes the discharge section 52 of the discharge mechanism 50, and discharges the processed pieces generated during cutting to the outside of the saw cover 24 by the discharge section 52. The discharge body portion 24B is formed in a concave shape that is open upwards (upwards and rearwards) and to the right. When viewed in the orientation of Figure 1 (viewed from the left-right direction), the discharge body portion 24B is open towards the upper left of the paper and also towards the front of the paper. When viewed from the left-right direction, the discharge body portion 24B slopes downwards along the outer circumference of the saw cover 24 as it approaches the rear. In other words, the discharge body 24B has a mounting opening 24C that opens upward (and to the rear) and an outlet opening 24D that opens to the right. To put it another way, the discharge body 24B is a notched portion provided in the saw cover 24 and has a region that opens upward and to the rear (mounting opening 24C) and a region that opens to the right (outlet opening 24D). An inlet opening 24E (see Figure 3) is formed at the front end of the discharge body 24B, penetrating in the front-rear direction (tangential direction to the upper end of the circular saw blade 14), and the inside of the discharge body 24B and the inside of the saw cover 24 are in communication through the inlet opening 24E. To put it another way, an inlet opening 24E that opens to the rear is formed at the upper end of the saw cover 24, and the inlet opening 24E constitutes the front end of the discharge body 24B (the notched portion of the saw cover 24). The inlet opening 24E can also be called a communication portion. The discharge body 24B is part of the outer periphery of the saw cover 24, and is the part to which the processed pieces discharged from the inside of the saw cover 24 to the outside of the saw cover 24 via the inlet opening 24E reach.

[0032] The left and right side walls constituting the inlet opening 24E of the saw cover 24 are provided with a pair of support bosses 24F, which serve as left and right support parts for supporting the opening / closing cover 54, described later. The support bosses 24F are formed in a substantially cylindrical shape with the left-right direction as the axial direction and protrude outward in the left-right direction from the outer surface of the saw cover 24. In addition, a locking recess 24G (see Figure 3) is formed on the inner circumference of the upper wall constituting the inlet opening 24E in the middle of the left-right direction, which serves as a locking part for locking the front end of the dust adapter 60, described later. The locking recess 24G is formed in a concave shape that is open to the lower and rear sides. A hook recess 24G1 that is cut upward is formed at the front end of the locking recess 24G. When viewed from the left-right direction, the locking recess 24G is positioned between the pair of left and right support bosses 24F and overlaps with a part of the support bosses 24F. That is, at least a part of the locking recess 24G and the support bosses 24F overlap each other when viewed from the left-right direction. In other words, the locking recess 24G and the support boss 24F are located in similar positions in the front-to-back direction, at least in part. Also, the locking recess 24G and the support boss 24F are located in similar positions in the up-to-down direction, at least in part.

[0033] The outer circumference of the saw cover 24 is provided with a pair of left and right mounting pieces 24H for attaching a fixing lever 56, which will be described later, to the rear side of the discharge body 24B. The mounting pieces 24H protrude from the outer circumference of the saw cover 24 toward the rear (radially outward), with the left-right direction being the thickness direction. As shown in Figure 3, a mounting boss 24J is provided between the pair of mounting pieces 24H for fastening and fixing the saw cover member 24L and the saw cover member 24R to each other, and the mounting boss 24J is formed in a substantially cylindrical shape with the left-right direction being the axial direction. A restricting projection 24K is integrally provided on the outer circumference of the mounting boss 24J, protruding upward and diagonally to the rear. In other words, the restricting projection 24K protrudes from the outer circumference of the mounting boss 24J. Furthermore, a spring housing portion 24M is provided between the pair of mounting pieces 24H, above the mounting boss 24J, for accommodating one end of the lever spring 58, which will be described later. The spring housing portion 24M is formed in a concave shape that opens diagonally upward and rearward when viewed from the left and right directions. As will be described in detail later, the arrangement of the support portion (mounting piece 24H) of the fixed lever 56 suppresses a decrease in dust collection efficiency (smooth movement of the processed piece) while suppressing an increase in size.

[0034] As shown in Figure 2, the motor housing 26 is formed in a roughly box shape that is open to the right as a whole. The motor housing 26 is located to the left of the saw cover 24 and is fastened and fixed to the saw cover member 24L in a position not shown.

[0035] The battery holder 28 extends from the top of the motor housing 26 toward the rear. The battery 30 is mounted in the battery holder 28 from the rear, and the battery 30 is positioned below the battery holder 28 and toward the rear of the motor housing 26. The battery 30 is electrically connected to the controller (not shown) and the motor 42 of the drive mechanism 40, which will be described later.

[0036] A handle portion 28A is provided on the upper side of the battery holder 28. The handle portion 28A is formed in a roughly U-shape that opens diagonally downward and forward when viewed from the left side. The front end of the handle portion 28A is connected to the motor housing 26, and the rear end of the handle portion 28A is connected to the battery holder 28. A trigger 32 is provided on the handle portion 28A so as to be pullable. By pulling (pressing) the trigger 32, a switch (not shown) housed inside the handle portion 28A is pressed. This switch is electrically connected to the controller, and in response to the operation of the trigger 32, the drive mechanism 40, which will be described later, is activated.

[0037] (Regarding the drive mechanism 40) As shown in Figure 1, the drive mechanism 40 comprises a motor 42 and an output shaft 44. The motor 42 is configured as a brushless motor and is housed in a motor housing 26 and electrically connected to a controller. The motor 42 has a pivot shaft 42A whose axial direction is left-right, and the pivot shaft 42A is rotatably supported by a motor bearing (not shown) fixed to the motor housing 26. A pinion gear is formed at the right end of the pivot shaft 42A.

[0038] The output shaft 44 has its axial direction in the left-right direction and is positioned below the right end of the pivot shaft 42A, and is rotatably supported by the saw cover member 24L of the saw cover 24. An output gear 45 is integrally rotatably mounted at the left end of the output shaft 44, and the output gear 45 is connected to the pinion gear of the pivot shaft 42A by a transmission mechanism 46. The center of the circular saw blade 14 is fixed to the right end of the output shaft 44 by a fixing bolt 47. As a result, when the motor 42 is driven, the output shaft 44 and the circular saw blade 14 are configured to rotate in one direction around the axis of the output shaft 44 (towards the direction of arrow C in Figure 1).

[0039] The lower part of the circular saw blade 14 is covered by a protective cover 48. The protective cover 48 is formed in a roughly semi-circular shape that is convex downwards when viewed from the right side, and is concave upwards. The protective cover 48 is connected to the output shaft 44 so as to be rotatable around the axis of the output shaft 44. Furthermore, the protective cover 48 is biased around the axis of the output shaft 44 by a biasing spring (not shown) and is held in the position shown in Figure 1. When cutting with the circular saw 10, the protective cover 48 rotates to the other side around the axis of the output shaft 44 against the biasing force of the biasing spring due to the workpiece, and the blade portion of the circular saw blade 14 is exposed.

[0040] (Regarding the discharge mechanism 50) As shown in Figures 1 to 7, the discharge mechanism 50 is configured as a mechanism for discharging the processed material that is rolled up by the circular saw blade 14 inside the saw cover 24 during cutting to the outside of the saw cover 24. The discharge mechanism 50 includes a discharge section 52 provided on the saw cover 24 and a fixing lever 56 as a fixing section. The discharge mechanism 50 further includes a dust adapter 60 or an opening / closing cover 54 as an attachment member that is detachably attached to the saw cover 24. Depending on the state of the work machine (circular saw 10), the dust adapter 60 or opening / closing cover 54 may not be included in the discharge mechanism 50 (and may not contribute to the discharge of processed material). For example, the dust adapter 60 or opening / closing cover 54 may be moved to a position where it does not become part of the passage for processed material, or it may be removed from the circular saw 10 and not participate in the discharge of processed material.

[0041] The discharge unit 52 is composed of the discharge main body 24B of the saw cover 24 and an opening / closing cover 54 as a cover, and the discharge unit 52 discharges the processed pieces generated during cutting to the outside of the saw cover 24. The opening / closing cover 54 is attached to the saw cover 24 and is configured to open and close the mounting opening 24C of the discharge main body 24B. When the opening / closing cover 54 is closed, it closes the mounting opening 24C of the discharge main body 24B (the open area upwards and backwards), and guides the processed pieces that are discharged backwards from the inlet opening 24E (so that they do not go upwards and backwards), so that they are discharged to the right from the outlet opening 24D of the discharge main body 24B (see arrow A in Figure 4). In other words, when the opening / closing cover 54 is closed, the discharge main body 24B is open only to the right, so processed pieces are discharged only from the right side. Furthermore, if the directionality of the backward movement of the processed piece is reduced too much (the momentum of the moving processed piece is lost too much), there is a risk that discharge will not be smooth. Therefore, the inner surface of the rear of the opening / closing cover 54 has a gentle slope shape to the right. Consequently, when the opening / closing cover 54 is closed, the processed piece is discharged to the right and rear. On the other hand, when the opening / closing cover 54 is opened, the mounting opening 24C of the discharge main body 24B is opened (the top is opened), and the movement of the processed piece is no longer restricted by the opening / closing cover 54. Consequently, the processed piece discharged from the inlet opening 24E toward the rear continues to move mainly toward the rear. Thus, the discharge direction of the processed piece changes between the closed and open states. Specifically, when the opening / closing cover 54 is open, the processed piece is discharged toward the rear. Furthermore, by opening the mounting opening 24C of the opening / closing cover 54 and attaching the dust adapter 60 to the discharge main body 24B, it is also possible to configure the system so that the processed material that enters the dust adapter 60 from the inlet opening 24E of the saw cover 24 is discharged to the rear by the dust adapter 60 (see arrow B in Figure 6). In other words, the discharge mechanism 50 is configured to allow switching between two discharge methods: one in which processed material is discharged to the right or rear of the circular saw 10 without using the dust adapter 60, and another in which processed material is discharged to the rear of the circular saw 10 using the dust adapter 60. The various components of the discharge mechanism 50 will be described below.

[0042] (Regarding the opening / closing cover 54) As shown in Figures 1 to 3, the opening / closing cover 54 is formed in a substantially elongated plate shape with the plate thickness direction in the vertical direction and extending in the front-rear direction. A pair of left and right supported portions 54A are provided on both sides of the front end of the opening / closing cover 54, which protrude downward, and the supported portions 54A are rotatably supported by the support boss 24F of the saw cover 24. In this way, the front end of the opening / closing cover 54 is rotatably connected to the saw cover 24 with the left-right direction as the axial direction. When the opening / closing cover 54 is in the closed state, the opening / closing cover 54 covers (closes) the mounting opening 24C of the discharge body 24B from above, so that only the outlet opening 24D of the discharge section 52 is open (this state is shown in Figure 4, and hereafter this position of the opening / closing cover 54 will be referred to as the closed position). Note that when the opening / closing cover 54 is in the closed state, it is positioned downwards as you move from front to rear. When viewed from the left and right, the discharge body 24B, which slopes downward along the outer circumference of the saw cover 24 as it approaches the rear, is covered by the opening / closing cover 54, which slopes in the same direction, so that the discharge body 24B is covered by the opening / closing cover 54 on the top and rear. Also, when viewed from the right, the opening / closing cover 54 is released from the closed position by rotating it clockwise around the support boss 24F, and the opening / closing cover 54 switches to the open position (as shown in Figures 1 to 3, and hereafter this position of the opening / closing cover 54 will be referred to as the open position). In the opening / closing cover 54, the left wall 54B extends to the rear from the left supported part 54A, and in the closed position, the left wall 54B covers the entire discharge body 24B from the left side. The rear end of the opening / closing cover 54 is provided with a cover-side hook 54C as an engaging part. In the closed state of the opening / closing cover 54, the cover-side hook 54C extends downward from the rear end of the opening / closing cover 54, and the lower end of the cover-side hook 54C is provided with a cover hook portion 54D that protrudes forward. Although not shown in the drawings, the opening / closing cover 54 is configured to remain open unless subjected to a predetermined operating force by engaging with the upper outer surface of the saw cover 24 (the upper portion of the locking recess 24G) in the open state.

[0043] (Regarding the fixed lever 56) As shown in Figures 2 to 4, the fixing lever 56 is formed in the shape of a substantially rectangular plate with the front-to-back direction as the plate thickness direction and the up-to-down direction as the longitudinal direction. The lower part of the fixing lever 56 is configured as an operating part 56A, and the upper part of the fixing lever 56 is configured as a lever-side hook 56B which acts as an engaging part. The upper-to-lower middle part of the fixing lever 56 is bent in a substantially crank shape, so that the operating part 56A is positioned behind the lever-side hook 56B. A lever shaft 56C (broadly speaking, an element that can be grasped as a connecting shaft) is integrally provided at the lower end of the lever-side hook 56B. In other words, the operating part 56A, the lever-side hook 56B, and the lever shaft 56C are each part of the fixing lever 56 which is a single component. The lever shaft 56C is formed in the shape of a substantially cylindrical shape with the left-to-right direction as the axial direction, and both left and right ends of the lever shaft 56C protrude outward from the lever-side hook 56B in the left-to-right direction. The lever-side hook 56B is positioned between a pair of mounting pieces 24H on the saw cover 24, and both longitudinal ends of the lever shaft 56C are rotatably supported by the mounting pieces 24H. This connects the locking lever 56 to the saw cover 24 so as to be rotatable in the left-right direction as the axial direction. Specifically, the locking lever 56 is configured to rotate between a fixed position (shown by a solid line in Figure 4) and an unlocked position (shown by a dashed line in Figure 4), which is rotated clockwise when viewed from the right side.

[0044] The operating section 56A protrudes downward from the mounting piece 24H when viewed from the right side, and is operable. A stopper section 56D protruding downward is provided at the bent portion in the middle of the vertical direction of the fixing lever 56, and the stopper section 56D is positioned adjacent to the rear side of the restricting projection 24K of the saw cover 24. As a result, when the fixing lever 56 is in the fixed position, the stopper section 56D abuts against the restricting projection 24K, restricting rotation of the fixing lever 56 to the opposite side of the unlocked position.

[0045] A lever spring 58 is provided as a biasing member on the rear side of the lever-side hook 56B. The lever spring 58 is configured as a compression coil spring and extends in approximately the front-rear direction. The rear end of the lever spring 58 is locked to the lever-side hook 56B, and the front end of the lever spring 58 is positioned within the spring housing portion 24M of the saw cover 24, so that the lever spring 58 biases the lever-side hook 56B to the rear. As a result, the fixed lever 56 is held in the fixed position by the biasing force of the lever spring 58.

[0046] A lever hook portion 56E protruding to the rear is formed at the upper end of the lever-side hook 56B. When the opening / closing cover 54 is in the closed position, the cover-side hook 54C of the opening / closing cover 54 is positioned adjacent to the rear of the lever hook portion 56E, and the cover hook portion 54D is positioned adjacent to the lower side of the lever hook portion 56E, so that the cover hook portion 54D and the lever hook portion 56E are engaged in the vertical direction. As a result, the rotation of the opening / closing cover 54 from the closed position to the open position is prevented by the fixing lever 56, and the opening / closing cover 54 is fixed to the saw cover 24 by the fixing lever 56. On the other hand, by pulling the operator's operating part 56A toward the rear, the fixing lever 56 is rotated from the fixed position to the unlocked position against the biasing force of the lever spring 58, thereby releasing the engagement between the opening / closing cover 54 and the fixing lever 56. In other words, the opening / closing cover 54 is allowed to rotate from the closed position to the open position.

[0047] When the opening / closing cover 54 is closed, the cover-side hook 54C of the opening / closing cover 54 is positioned between the pair of mounting pieces 24H, and the rear end of the opening / closing cover 54 is positioned above the lever-side hook 56B of the fixing lever 56. In other words, when the opening / closing cover 54 is closed, the lever-side hook 56B of the fixing lever 56 is obscured from view by the pair of mounting pieces 24H and the opening / closing cover 54. Furthermore, because the cover-side hook 54C is positioned between the pair of mounting pieces 24H, the lateral movement of the rear end of the opening / closing cover 54 is restricted by the pair of mounting pieces 24H.

[0048] (Regarding the Dust Adapter 60) As shown in Figures 5 to 7, the dust adapter 60 is composed of an adapter body 61 which constitutes the front part of the dust adapter 60 and an adapter discharge section 62 which constitutes the rear part of the dust adapter 60. The adapter body 61 is formed in a substantially rectangular cylindrical shape with the front-rear direction as the axial direction. A connecting cylindrical section 61A for connecting the adapter discharge section 62 is formed at the rear end of the adapter body 61, and the connecting cylindrical section 61A is formed in a substantially cylindrical shape with the front-rear direction as the axial direction. The connecting cylindrical section 61A is positioned slightly offset to the right of the adapter body 61 and is smoothly connected to the adapter body 61. The front end of the adapter body 61 is formed in a shape corresponding to the inlet opening 24E of the saw cover 24.

[0049] When the adapter body 61 is attached to the saw cover 24, the lower part of the adapter body 61 is positioned inside the discharge body portion 24B of the saw cover 24. In this state, the front end of the adapter body 61 is positioned adjacent to the rear side of the inlet opening 24E, and the inside of the adapter body 61 and the inside of the saw cover 24 (inlet opening 24E) are in communication in the front-rear direction (see Figure 6). In other words, when the adapter body 61 is attached to the saw cover 24, the adapter body 61 is connected to the inlet opening 24E of the discharge portion 52, and processed pieces flowing from the inlet opening 24E to the rear enter the adapter body 61. An extended wall portion 61B is formed on the right wall of the adapter body 61, and the extended wall portion 61B is positioned adjacent to the right side of the upper end of the saw cover 24. In addition, a notch 61C (see Figure 7) is formed on the left wall of the adapter body 61 to accommodate a part of the left wall of the discharge body portion 24B of the saw cover 24.

[0050] The adapter body 61 is provided with a locking hook 61D projecting upward from the outer circumference of its front end, and a hook portion 61D1 projecting upward from the front end of the locking hook 61D is formed thereon. The locking hook 61D is inserted into the locking recess 24G of the saw cover 24, and the hook portion 61D1 is inserted into the hook recess 24G1, thereby locking the adapter body 61 to the saw cover 24. This restricts the movement of the front end of the dust adapter 60. The rear end of the lower wall of the adapter body 61 is provided with an adapter-side hook 61E as an engaged portion. The adapter-side hook 61E extends downward from the rear end of the adapter body 61, and an adapter hook portion 61F projecting forward is provided at the lower end of the adapter body 61.

[0051] In the assembled state of the dust adapter 60, the adapter-side hook 61E of the dust adapter 60 is positioned adjacent to the rear side of the lever hook portion 56E of the fixing lever 56, and the adapter hook portion 61F is positioned adjacent to the lower side of the lever hook portion 56E, so that the adapter hook portion 61F and the lever hook portion 56E are engaged in the vertical direction. As a result, upward movement of the rear end of the adapter body 61 is prevented by the fixing lever 56, and the dust adapter 60 is fixed to the saw cover 24 by the fixing lever 56. When installing, with the hook portion 61D1 engaged with the locking recess 24G, the dust adapter 60 can be attached to the saw cover 24 by moving the rear end of the dust adapter 60 downward to engage the adapter-side hook 61E and the lever hook portion 56E. Then, similar to the case of the opening / closing cover 54, pulling the operating part 56A rotates the fixing lever 56 from the fixed position to the unlocked position against the biasing force of the lever spring 58, thereby releasing the engagement between the fixing lever 56 and the dust adapter 60 (adapter hook portion 61F). To remove the dust adapter 60 from the saw cover 24, with the fixing lever 56 rotated from the fixed position to the unlocked position, the rear end of the dust adapter 60 is moved upward, rotating it so that the hook portion 61D1 is the pivot point, and the engagement between the hook portion 61D1 and the locking recess 24G is released, thereby allowing it to be removed. The operation of the fixing lever 56, the operation of opening the opening / closing cover 54, and the operation of removing the dust adapter 60 are all performed in a clockwise direction when viewed from the right.

[0052] Furthermore, in the assembled state of the dust adapter 60, the adapter-side hook 61E of the adapter body 61 is positioned between the pair of mounting pieces 24H, and the rear end of the adapter body 61 is positioned above the lever-side hook 56B. In other words, in the assembled state of the dust adapter 60, the lever-side hook 56B of the fixing lever 56 is obscured from view by the pair of mounting pieces 24H and the adapter body 61. In addition, because the adapter-side hook 61E is positioned between the pair of mounting pieces 24H, the lateral movement of the rear end of the adapter body 61 is restricted by the pair of mounting pieces 24H.

[0053] The adapter discharge section 62 is formed in a substantially cylindrical shape extending in the front-rear direction, with its longitudinal middle section bent diagonally downward and rearward. The front end of the adapter discharge section 62 is inserted into the connecting cylinder section 61A of the adapter body 61 and is connected to the connecting cylinder section 61A so as to be rotatable about the front-rear axis but immovable in the front-rear direction. This allows processed pieces that flow into the adapter body 61 from the inlet opening 24E to the rear side to be discharged to the rear side from the rear end opening of the adapter discharge section 62. Furthermore, the direction of extension of the adapter discharge section 62 can be changed by rotating the adapter discharge section 62. The adapter discharge section 62 is in contact with the connecting cylinder section 61A, and the frictional force between them prevents the adapter discharge section 62 from easily rotating (relatively moving) relative to the connecting cylinder section 61A. In addition, the rear part of the adapter discharge section 62 is configured to be connectable to a dust box or dust collector (not shown), so that processed pieces discharged from the adapter discharge section 62 are collected in the dust box or dust collector.

[0054] (Effects and Benefits) Next, the operation and effects of this embodiment will be described.

[0055] In the cutting operation of the circular saw 10 configured as described above, the operator is positioned behind the circular saw 10 and grips the handle portion 28A. When the operator operates the trigger 32, the circular saw blade 14 rotates together with the output shaft 44 due to the driving force of the motor 42, and cutting is performed on the workpiece. During the cutting operation of the circular saw 10, the cut pieces that are rolled up by the front end of the circular saw blade 14 flow to the rear along the inner circumference of the upper end of the saw cover 24. The cut pieces flowing to the rear enter the discharge body portion 24B through the inlet opening 24E.

[0056] When cutting without using the dust adapter 60 of the discharge mechanism 50, the opening / closing cover 54 is positioned in the closed position (closed state) to block the mounting opening 24C of the discharge body 24B with the opening / closing cover 54. As a result, the processed material that flows from the saw cover 24 to the discharge body 24B is discharged to the right from the outlet opening 24D of the discharge body 24B. This ensures that the processed material is discharged to the right for the operator positioned behind the circular saw 10. Therefore, cutting can be performed while suppressing the discharge of processed material towards the operator. Furthermore, if it is desired to discharge the processed material to the rear, the direction of discharge of the processed material can be changed by opening the opening / closing cover 54.

[0057] On the other hand, when cutting using the dust adapter 60 of the discharge mechanism 50, the opening / closing cover 54 is opened to open the mounting opening 24C of the discharge main body 24B, and the dust adapter 60 is attached to the discharge main body 24B and connected to the inlet opening 24E of the saw cover 24. As a result, the processed pieces that enter the dust adapter 60 from the inlet opening 24E are discharged to the rear from the adapter discharge section 62 and collected in a dust box or dust collector. Therefore, processed pieces flowing to the rear inside the saw cover 24 can be efficiently discharged to the rear by the dust adapter 60 and collected in a dust box or dust collector. In particular, the inlet opening 24E (communication section) is a hole that penetrates in the direction along the front-to-back direction and penetrates in a direction parallel to the tangential direction of the circular saw blade 14 (upper end). As a result, the processed pieces can be moved to the discharge main body 24B while maintaining their momentum, thereby improving dust collection efficiency. In other words, since the workpiece is moved by the rotational force of the circular saw blade 14, and its direction of movement is easily directed in the tangential direction of the circular saw blade 14, by configuring the inlet opening 24E (communication section) as a hole that penetrates in the direction along the front-to-back direction, it becomes possible to collect dust while suppressing obstruction to the movement of the workpiece. Furthermore, since the dust adapter 60 is configured so that the direction of discharge of the workpiece can be changed by changing the rotational position of the adapter discharge section 62, it is possible to improve work efficiency by flexibly changing the direction of discharge of the workpiece even without using a dust box or dust collector. In addition, the internal space (dust collection passage) of the adapter body 61 is connected to the inlet opening 24E (communication section) and is a space that extends in a direction parallel to the tangential direction of the circular saw blade 14 (upper end) (front-to-back direction), which also improves dust collection efficiency. Furthermore, since the inlet opening 24E (communication section) is a hole that penetrates in the direction along the front-to-back direction, the dust adapter 60 is also configured to extend in the front-to-back direction. This suppresses the increase in size of the workpiece in the vertical direction. For example, if the entrance opening 24E (communication section) is a through-hole oriented in the front-to-back direction, the dust adapter 60 connected thereto will extend in the vertical direction. In this case, there is a risk of increasing the size in the vertical direction, but in this embodiment, such an increase in size can be suppressed.

[0058] As described above, in the discharge mechanism 50, an opening / closing cover 54 is provided on the saw cover 24 so as to be able to open and close the mounting opening 24C of the discharge main body 24B. When the opening / closing cover 54 is closed, the outlet opening 24D of the discharge section 52 opens to the right, and the processed pieces are discharged from the outlet opening 24D. On the other hand, by opening the opening / closing cover 54 and attaching the dust adapter 60 to the discharge main body 24B, the processed pieces that enter the dust adapter 60 from the inlet opening 24E of the saw cover 24 are discharged to the rear from the adapter discharge section 62. As a result, in the circular saw 10, the discharge mechanism 50 that switches the direction of discharge of processed pieces is concentrated at the rear of the saw cover 24, so the discharge mechanism 50 can be made smaller, and this can contribute to making the circular saw 10 smaller in size.

[0059] Furthermore, in the discharge mechanism 50, a fixing lever 56 is provided on the saw cover 24. When the dust adapter 60 is not attached, the fixing lever 56 engages with the closed opening / closing cover 54, thereby fixing the opening / closing cover 54 to the saw cover 24. On the other hand, when the dust adapter 60 is attached to the saw cover 24, the fixing lever 56 engages with the dust adapter 60, thereby fixing the dust adapter 60 to the saw cover 24. In other words, the fixing lever 56 functions as a common fixing member for the opening / closing cover 54 and the dust adapter 60. This makes the discharge mechanism 50 smaller compared to a configuration in which separate fixing members are provided on the saw cover 24 for the opening / closing cover 54 and the dust adapter 60. Therefore, the discharge mechanism 50 can be made even smaller. Furthermore, the support portion (mounting piece 24H) of the fixing lever 56 is located below the discharge body portion 24B. More specifically, the fixing lever 56 is located below the upper end position of the circular saw blade 14. As described above, by configuring the inlet opening 24E (communication section) as a hole that penetrates in the front-to-back direction, dust collection efficiency can be improved. However, when the dust adapter 60 is connected there, the area below the discharge main body 24B (dust adapter 60) becomes dead space. This dead space is used as a support point for the fixing lever 56 to suppress an increase in size. In other words, by positioning the support part (mounting piece 24H) of the fixing lever 56 below the discharge main body 24B, this dead space is effectively utilized, and the increase in size of the circular saw 10 is suppressed. More specifically, both the opening / closing cover 54 and the dust adapter 60 are supported at two points on the saw cover 24. At the front support point (upstream side in the flow of processed pieces) (support boss 24F, hook recess 24G1), they are rotatably supported, while at the rear (downstream side in the flow of processed pieces) they are supported by a movable support part (fixing lever 56) that requires support space, thereby suppressing an increase in size.For example, the fixing lever 56 could be configured to be supported above the locking recess 24G, but in that case, the support structure for the fixing lever 56 would protrude upward from above the saw cover 24, leading to an increase in vertical size. Furthermore, since the handle portion 28A is located on the left side of the saw cover 24, there is a possibility that the operator's hand may come into contact with the support structure for the fixing lever 56 when attempting to operate the handle portion 28A or during operation, which may reduce the operability of the handle portion 28A. In this embodiment, such a reduction in operability can be suppressed.

[0060] Furthermore, as described above, the fixing lever 56 is provided on the saw cover 24. In addition, the fixing lever 56 is connected to the saw cover 24 so as to be rotatable (movable) between a fixed position in which it engages with the cover-side hook 54C of the opening / closing cover 54 and the adapter-side hook 61E of the dust adapter 60, and a released position in which the engagement with the cover-side hook 54C and the adapter-side hook 61E is released. This means that it is sufficient to provide the fixing lever 56, which is made of a separate component from the saw cover 24, the opening / closing cover 54, and the dust adapter 60, on the saw cover 24. For this reason, compared to a configuration in which the fixing lever 56 is provided on the opening / closing cover 54 and the dust adapter 60, for example, this can contribute to reducing the number of parts of the circular saw 10.

[0061] Furthermore, the outer circumference of the saw cover 24 is provided with a pair of left and right mounting pieces 24H that protrude to the rear at the rear side of the discharge body 24B. The lever-side hook 56B of the fixing lever 56 is positioned between the pair of mounting pieces 24H, and the lever shaft 56C of the lever-side hook 56B is rotatably connected to the mounting pieces 24H. The operating part 56A of the fixing lever 56 is positioned below the lever-side hook 56B, and when the operating part 56A is pulled to the rear or upward, the fixing lever 56 rotates from the fixed position to the unlocked position. In other words, when the operating part 56A is pulled in the same direction as the protrusion of the mounting pieces 24H from the saw cover 24, the fixing lever 56 rotates to the unlocked position. To put it another way, in order to rotate the fixing lever 56 to the unlocked position, the operating part 56A must be pulled to the opposite side from the saw cover 24 (i.e., moved in a clockwise direction when viewed from the right side). Since the operation of the operating unit 56A is in the same direction as the operation of opening the opening / closing cover 54 from the closed state to the open state and the operation of removing the dust adapter 60 from the saw cover 24, the operation of the operating unit 56A can be seamlessly transitioned to opening the opening / closing cover 54 or removing the dust adapter 60, resulting in improved operability. Furthermore, compared to a configuration in which the operating unit 56A is pressed toward the saw cover 24 to release the fixed state of the fixing lever 56, accidental operation to the fixed position of the fixing lever 56 during cutting, etc., can be suppressed. Therefore, the workability of the circular saw 10 can be improved.

[0062] Furthermore, when the opening / closing cover 54 is in the closed position, the cover-side hook 54C is positioned between the pair of mounting pieces 24H and behind the lever-side hook 56B. As a result, the lever-side hook 56B is covered from the rear and from both sides by the mounting pieces 24H and the cover-side hook 54C. Also, when the dust adapter 60 is installed, the adapter-side hook 61E is positioned between the pair of mounting pieces 24H and behind the lever-side hook 56B. As a result, the lever-side hook 56B is covered from the rear and from both sides by the mounting pieces 24H and the adapter-side hook 61E. This prevents the operator from directly contacting the lever-side hook 56B during cutting or other processes. Consequently, it is possible to prevent the fixed lever 56 from being unintentionally rotated to the unlocked position.

[0063] Furthermore, when the opening / closing cover 54 is closed, the lever-side hook 56B is covered from above by the opening / closing cover 54, and when the dust adapter 60 is installed, the lever-side hook 56B is covered from above by the dust adapter 60. This further reduces the risk of the operator directly contacting the lever-side hook 56B during cutting or other processes. As a result, it further reduces the risk of the fixing lever 56 being unintentionally rotated to the unlocked position.

[0064] Furthermore, in the saw cover 24, a locking recess 24G for securing the dust adapter 60 is located between a pair of left and right support bosses 24F that support the opening / closing cover 54. This allows the mounting positions of the front end of the opening / closing cover 54 and the front end of the dust adapter 60 to be approximately aligned with the saw cover 24 in the vertical and front-rear directions. This makes it possible to maintain the opening / closing cover 54 attached to the saw cover 24 while using the fixing lever 56 as a common fixing part for both the opening / closing cover 54 and the dust adapter 60.

[0065] Furthermore, the inlet opening 24E of the discharge body 24B in the saw cover 24 is located on the rear side (the side in the rotation direction of the circular saw blade 14), and the outlet opening 24D is located on the right side (one side in the thickness direction of the circular saw blade 14). This allows the orientation of the processed material, which is wound up in the rotation direction of the circular saw blade 14, to be changed when the opening / closing cover 54 is closed, and the processed material to be discharged to the outside of the saw cover 24. Also, when the dust adapter 60 is installed, the dust adapter 60 is located on the rear side of the inlet opening 24E (the side in the rotation direction of the circular saw blade 14). This allows the processed material, which is wound up in the rotation direction of the circular saw blade 14, to be efficiently drawn into the dust adapter 60 and discharged from the dust adapter 60 to a dust collector or the like.

[0066] (Second Embodiment) The circular saw 100 as a work machine according to the second embodiment will be described below with reference to Figures 8 to 10. The circular saw 100 of the second embodiment is configured the same as the circular saw 10 of the first embodiment, except for the points shown below. In Figures 8 to 10, parts configured the same as the circular saw 10 of the first embodiment are denoted by the same reference numerals.

[0067] In the circular saw 100, the opening / closing cover 54 of the discharge mechanism 50 is provided with a cover-side engaging piece 54E as the engaged part, instead of a cover-side hook 54C. The cover-side engaging piece 54E constitutes the rear end of the left wall 54B of the opening / closing cover 54, and a cover-side engaging groove 54F, which is open to the lower side, is formed to penetrate the cover-side engaging piece 54E in the left-right direction.

[0068] Furthermore, in the discharge mechanism 50 of the second embodiment, instead of a fixing lever 56, a fixing bolt 102 is provided on the saw cover 24 as a fixing part. The fixing bolt 102 is composed of a shaft portion 102A and a knob portion 102B as an operating part provided at the left end of the shaft portion 102A. The shaft portion 102A is formed in a substantially cylindrical shape with the left-right direction as the axial direction, and male threads are formed on the outer circumference of the shaft portion 102A. The fixing bolt 102 is screwed from the left side into the rear part of the discharge body portion 24B on the saw cover 24, and is screw-connected to the saw cover 24. Furthermore, when the opening / closing cover 54 is in the closed position, the shaft portion 102A of the fixing bolt 102 is inserted into the cover-side engagement groove 54F of the opening / closing cover 54, and by tightening the fixing bolt 102, the cover-side engagement piece 54E is sandwiched in the left-right direction by the knob portion 102B and the saw cover 24, thereby fixing the opening / closing cover 54 to the saw cover 24 (see Figure 9).

[0069] Furthermore, in the dust adapter 60, similar to the opening / closing cover 54, an adapter-side engaging piece 61G is provided as the engaged part instead of the adapter-side hook 61E. The adapter-side engaging piece 61G extends downward from the left end of the rear end of the adapter body 61, and an adapter-side engaging groove 61H, which is open downward, is formed to penetrate the adapter-side engaging piece 61G in the left-right direction. When the dust adapter 60 is installed, the shaft portion 102A of the fixing bolt 102 is inserted into the adapter-side engaging groove 61H, and by tightening the fixing bolt 102, the adapter-side engaging piece 61G is sandwiched in the left-right direction by the knob portion 102B and the saw cover 24, thereby fixing the dust adapter 60 to the saw cover 24 (see Figure 10).

[0070] As described above, in the circular saw 100 of the second embodiment, the discharge mechanism 50 for switching the direction of discharge of processed material is concentrated at the rear of the saw cover 24, so that the discharge mechanism 50 can be made smaller, and consequently contribute to making the circular saw 100 smaller. In addition, in the discharge mechanism 50 of the second embodiment, when the dust adapter 60 is not attached, the cover-side engaging piece 54E of the open / close cover 54 in the closed position is fastened with the knob portion 102B of the fixing bolt 102, so that the fixing bolt 102 and the open / close cover 54 engage and the open / close cover 54 is fixed to the saw cover 24. On the other hand, when the dust adapter 60 is attached, the adapter-side engaging piece 61G of the dust adapter 60 attached to the discharge body 24B is fastened with the knob portion 102B of the fixing bolt 102, so that the fixing bolt 102 and the dust adapter 60 engage and the dust adapter 60 is fixed to the saw cover 24. As a result, in the second embodiment as well, the fixing bolt 102 functions as a common fixing member for the opening / closing cover 54 and the dust adapter 60. Therefore, the discharge mechanism 50 can be made even smaller.

[0071] In the first embodiment, a fixing lever 56 is provided on the saw cover 24, and an engaged portion that engages with the fixing lever 56 is formed on the opening / closing cover 34 and the dust adapter 60. In the second embodiment, a fixing bolt 102 is provided on the saw cover 24, and an engaged portion that engages with the fixing bolt 102 is formed on the opening / closing cover 34 and the dust adapter 60. Alternatively, in the first embodiment, the fixing lever 56 may be provided on the opening / closing cover 34 and the dust adapter 60, and an engaged portion that engages with the fixing lever 56 may be formed on the saw cover 24. Similarly, in the second embodiment, the fixing bolt 102 may be provided on the opening / closing cover 34 and the dust adapter 60, and an engaged portion that engages with the fixing bolt 102 may be formed on the saw cover 24. A third embodiment, which is a modified version of this, will be described below.

[0072] (Third embodiment) The circular saw 200 as a work machine according to the third embodiment will be described below with reference to Figures 11 to 13. The circular saw 200 of the third embodiment is configured in the same way as the circular saw 100 of the second embodiment, except for the points shown below. In Figures 11 to 13, parts configured in the same way as the circular saw 100 of the second embodiment are denoted by the same reference numerals.

[0073] The circular saw 200 differs from the previously described embodiment in that the fixing bolts, which serve as the fixing part, are provided on the opening / closing cover 54 and dust adapter 60 side, rather than on the saw cover 24 side.

[0074] The saw cover 24 is provided with a plate portion 201, and the plate portion 201 is provided with a recessed portion 201A that is recessed downwards. The opening / closing cover 54 is provided with a fixing bolt 154 and a pair of plate-shaped clamping portions 154E and 154F on the left and right sides. The fixing bolt 154 is provided with a shaft portion 154A. The shaft portion 154A is formed in a substantially cylindrical shape with the left-right direction as the axial direction, and a male thread is formed on the outer circumference of the shaft portion 154A. The clamping portion 154E has a through hole through which the shaft portion 154A is inserted, and the clamping portion 154F has a female screw hole that screws into the male thread portion of the shaft portion 154A. Therefore, the shaft portion 154A is loosely fitted to the clamping portion 154E and screwed into the clamping portion 154F. By rotating the shaft portion 154A, the fixing bolt 154 presses the clamping portion 154E to the right, and the clamping portions 154E and 154F are configured to move closer together in the left-right direction.

[0075] The dust adapter 60 is provided with a fixing bolt 161 and a pair of plate-shaped clamping portions 161G and 161H. The fixing bolt 161 is provided with a shaft portion 161A. The shaft portion 161A is formed in a substantially cylindrical shape with the left-right direction as its axial direction, and a male thread is formed on the outer circumference of the shaft portion 161A. The clamping portion 161G has a through hole through which the shaft portion 161A is inserted, and the clamping portion 161H has a female screw hole that engages with the male thread portion of the shaft portion 161A. Therefore, the shaft portion 161A is loosely fitted to the clamping portion 161G and screwed into the clamping portion 161H. By rotating the shaft portion 161A, the fixing bolt 161 presses the clamping portion 161G to the right, and the clamping portions 161G and 161H are configured to move closer together in the left-right direction.

[0076] Next, the method of fixing the opening / closing cover 54 to the saw cover 24 will be explained. In the state shown in Figure 12, the opening / closing cover 54 is in the closed state. When the opening / closing cover 54 is in the closed state, the shaft portion 154A is located in the recess 201A, the clamping portion 154E is located on the left side of the plate portion 201, and the clamping portion 154F is located on the right side of the plate portion 201. In this state, the fixing bolt 154 is rotated to press the clamping portion 154E to the right, bringing the clamping portion 154E and the clamping portion 154F closer together in the left-right direction. The plate portion 201 is then clamped between the clamping portions 154E and 154F, preventing the opening / closing cover 54 from moving to the open state. In other words, the opening / closing cover 54 is fixed to the saw cover 24.

[0077] Next, the method of fixing the dust adapter 60 to the saw cover 24 will be explained. In the state shown in Figure 13, the dust adapter 60 is attached to the saw cover 24. When the dust adapter 60 is attached to the saw cover 24, the shaft portion 161A is positioned in the recess 201A, the clamping portion 161G is positioned on the left side of the plate portion 201, and the clamping portion 161H is positioned on the right side of the plate portion 201. In this state, the fixing bolt 161 is rotated, and the clamping portion 161G is pressed to the right, bringing the clamping portion 161G and the clamping portion 161H closer together in the left-right direction. The plate portion 201 is then clamped between the clamping portions 161G and 161H, preventing the dust adapter 60 from being removed from the saw cover 24. In other words, the dust adapter 60 is fixed to the saw cover 24.

[0078] As described above, in the third embodiment, the fixing bolt, which serves as the fixing part, is provided on the opening / closing cover 54 and dust adapter 60 side, rather than on the saw cover 24 side. However, the fixing part may also be a fixing lever as in the first embodiment.

[0079] In the embodiment described above, the opening / closing cover 54 is configured such that when it is in the open position, one end is supported by the saw cover 24 and it is not removed from the circular saw 10. This configuration helps to prevent the loss of the opening / closing cover 54, but the opening / closing cover 54 may also be configured to be removable. That is, the open state of the opening / closing cover in this invention includes the state in which it is removed from the work machine. In addition, the dust adapter 60 is not supported by the circular saw 10 when it is removed from the circular saw 10, but it may be moved to a position that does not cover the discharge part and is configured so that a part of it is supported by the circular saw 10. However, since the dust adapter is large, if it is constantly supported by the circular saw 10, it may affect workability. Therefore, the embodiment described above is preferable in terms of workability. [Explanation of symbols]

[0080] 10. Circular saw (working equipment) 14 Circular saw blade (tip tool) 22 Housing 24D exit opening 24E Inlet opening 24F Support boss (support part) 24G Locking recess (locking part) 24H mounting piece 42 motors 44 Output shaft 52 Discharge section 54 Opening / Closing Cover (Cover) 54C Cover-side hook (engaged part) 54E Cover-side engaging piece (engaged portion) 56. Fixing lever (fixing part) 56A Operation section 56B Lever-side hook (engaging part) 60 Dust Adapter (Attachment Component) 61E Adapter-side hook (engaged part) 61G Adapter-side engaging piece (engaged portion) 100 Circular saw (working equipment) 102 Fixing bolt (fixing part) 102A Shaft 102B Knob section (operating section)

Claims

1. Motor and, The motor drives the output shaft to which the circular saw blade is attached, A housing that houses the motor and covers a part of the circular saw blade, The housing is provided with a discharge unit that discharges processed material generated during processing from the inside of the housing to the outside, A cover that, when operated, can be in a closed state that blocks a part of the discharge section, or in an open state that opens a part of the discharge section, An attachment member connected to the discharge section in the open state for discharging or collecting processed pieces from the discharge section, A fixing portion is provided movably on one of the cover and the attachment member and the housing, The cover and the attachment member and the housing have an engaging portion provided on the other side, Equipped with, When the cover is in the closed state, the fixing portion engages with the engaged portion, thereby fixing the cover to the housing, and when the attachment member is attached, the fixing portion engages with the engaged portion, thereby fixing the attachment member to the housing. A work machine that, when operated, moves the fixed part to a fixed position in which it engages with the engaged part, or to a release position in which it is released from engagement with the engaged part.

2. The fixing portion is movably provided in the housing, The work machine according to claim 1, wherein the engaged portion is integrally formed on the cover and the attachment member.

3. The outer periphery of the housing is provided with a pair of mounting pieces that protrude from the housing toward one side in a first direction and are arranged opposite to a second direction perpendicular to the first direction. The aforementioned fixing part is Displaced between the pair of mounting pieces, and rotatably supported by the mounting pieces with the second direction as the axial direction, and having an engaging portion that engages with the engaged portion, An operating portion is positioned on one side of the engagement portion in a third direction perpendicular to the first and second directions, It consists of, The work machine according to claim 2, wherein the operating part is pulled to one side in the first direction, causing the fixing part to rotate from the fixed position to the unlocked position.

4. The work machine according to claim 3, wherein the engaged portion is located between a pair of mounting pieces and on one side of the first direction of the engaged portion.

5. The work machine according to claim 3 or claim 4, wherein, in the closed state of the cover, the engaging portion is covered by a part of the cover from the other side in the third direction.

6. The work machine according to claim 3 or claim 4, wherein, in the state in which the attachment member is attached, the engaging portion is covered from the other side in the third direction by a part of the attachment member.

7. The housing has a pair of support parts that rotatably support the cover and are spaced apart in the second direction, and a locking part that locks the attachment member. The work machine according to claim 3, wherein the locking portion is arranged between the pair of support portions.

8. The aforementioned fixing part is A shaft portion connected to the housing so as to be movable in the axial direction, An operating part provided at one end of the aforementioned shaft portion, It consists of, In the fixed position, the engaged portion is clamped in the axial direction by the operating portion and the housing. The work machine according to claim 2, wherein in the fixed release position, the clamping state between the operating unit and the housing and the engaged portion is released.

9. The work machine according to claim 8, wherein the shaft portion and the housing are screw-connected.

10. The discharge section has an inlet opening that opens in the tangential direction to the outer circumference of the circular saw blade and an outlet opening that opens to one side in the thickness direction of the circular saw blade, The work machine according to claim 1, wherein, in the state in which the attachment member is installed, the attachment member is positioned in the rotational direction of the circular saw blade with respect to the entrance opening.

11. The cover is rotatable with respect to a support provided on the housing as a pivot point. The work machine according to claim 1, wherein the fixing portion is located downstream of the support portion in the direction of flow of the processed piece.

12. The housing has a saw cover that covers a portion of the upper part of the circular saw blade, The work machine according to claim 11, wherein the support portion is provided on the upper side of the saw cover.

13. Cutting can be performed by advancing the rotating circular saw blade forward. The work machine according to claim 12, wherein the support portion is located behind the rotation center of the circular saw blade.

14. The cutting operation can be performed by advancing the rotating circular saw blade forward, The housing has a saw cover that covers the upper part of the circular saw blade, The discharge unit is configured to discharge the processed piece along the tangential direction of the circular saw blade when the cover is in the open state. The work machine according to claim 1, wherein the fixing portion is supported by the housing at a position below the upper end of the circular saw blade or below the discharge portion.

15. The work machine according to claim 14, wherein the cover is configured to lower from front to rear in the closed state, covering a part of the discharge section.

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