Portable cutting machine

Abstract

To provide a portable cutting machine which includes a new type of an inclination angle positioning mechanism of a body part relative to a base.SOLUTION: A portable cutting machine comprises: a base; a body part; an angular plate; a fixing mechanism which is constructed to be capable of fixing an inclination angle of the body part relative to the base; and an inclination angle positioning mechanism which performs positioning of the inclination angle to be a prescribed inclination angle. The angular plate has at least one hole penetrating in a front-back direction at a position corresponding to a prescribed inclination angle. The inclination angle positioning mechanism includes at least one pin inserted into at least one hole which is displaceable between a non-restriction position and a restriction position in the front-back direction and non-displaceable in a direction orthogonal to the front-back direction. When the inclination angle is the prescribed inclination angle and one pin of at least one pin is at the restriction position, a lateral face of one pin contacts with the body part to restrict inclination of the body part in a direction where the inclination angle increases.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a portable cutting machine. [Background technology]

[0002] A cutting machine called a portable circular saw (hereinafter simply referred to as a circular saw) includes a base and a main body. The main body includes an electric motor and a generally circular cutting tool that is driven to rotate by the electric motor. The main body is disposed on one side of the base, while a part of the cutting tool protrudes beyond the base to the other side. When using such a cutting machine, a user brings the bottom surface of the base into contact with the material to be cut while the cutting tool is rotating, and moves the cutting machine forward. As a result, the cutting tool protruding beyond the base cuts the material to be cut.

[0003] One such circular saw is known to have a body that can be tilted around a tilt axis that extends in the front-rear direction (a direction defined by the side on which the circular saw moves when cutting a workpiece with a cutting tool and the opposite side) using a member called an angular plate. In this type of circular saw, the tilt angle of the body relative to the base can be fixed at any angle between the minimum tilt angle (e.g., 0 degrees, i.e., the angle at which the base and the cutting tool are perpendicular) and the maximum tilt angle (e.g., 50 degrees).

[0004] Such circular saws employ a mechanism (hereinafter referred to as the inclination angle positioning mechanism) for easily positioning the inclination angle of the main body relative to the base to an inclination angle that is used frequently (hereinafter referred to as the high-frequency inclination angle).

[0005] For example, the following Patent Document 1 discloses a detent mechanism as such an inclination angle positioning mechanism. Specifically, a bracket (which can be tilted together with the cutting tool) for supporting the main body by the angular plate has a hemispherical recess at each of a plurality of positions corresponding to a plurality of high-frequency inclination angles on a surface facing the angular plate. A pin penetrating the angular plate is attached to the angular plate. A cam-type knob is attached to one end of the pin (the end opposite the bracket). The cam-type knob is configured to displace the pin between a position where the pin approaches the bracket (hereinafter referred to as a regulating position) and a position where the pin moves away from the bracket (hereinafter referred to as a non-regulating position) by its rotation. When the pin is in the regulating position, if the main body is tilted relative to the base to a position corresponding to one of the plurality of high-frequency inclination angles, the other end of the pin (the end opposite the knob) fits into the recess of the angular plate. With such a configuration, the inclination angle can be easily positioned to a desired high-frequency inclination angle.

[0006] The following Citation 2 discloses another type of tilt angle positioning mechanism. Specifically, the angular plate has an arc-shaped through hole for positioning the tilt angle. A pin is inserted into this through hole. A knob is attached to one end of the pin (the end opposite the bracket). The other end of the pin extends from the through hole to a position where it can abut against the side of the bracket. The position of the pin can be changed along the arc-shaped through hole by loosening the knob, and it can be fixed in that position by tightening the knob. When the main body is tilted from the minimum tilt angle to the high-frequency tilt angle with respect to the base while the pin is fixed in a position corresponding to the desired high-frequency tilt angle, the side of the pin abuts against the side of the bracket. This restricts the tilt of the main body in a direction in which the tilt angle increases. With this configuration, the tilt angle can be easily positioned to the high-frequency tilt angle.

[0007] Such an inclination angle positioning mechanism can be used not only in circular saws, but also in various portable cutting machines that are configured so that the inclination angle of the main body relative to the base can be changed. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 5398799 [Patent Document 2] Patent Publication No. 2020-192782 Summary of the Invention [Problem to be solved by the invention]

[0009] However, the tilt angle positioning mechanism described above leaves room for improvement in terms of workability. For example, in Patent Document 1, even if the pin is stuck in one of the multiple recesses, if the user applies a strong force to the main body in the tilting direction, the pin will come out of the recess (i.e., further tilting operation is possible). Therefore, the user needs to apply a moderate force to the main body in order to position the tilt position. Furthermore, since one pin is used in common for multiple recesses, it is difficult to know which recess out of the multiple recesses the pin is stuck in (i.e., which of the multiple high-frequency tilt angles the main body is at).

[0010] In addition, in Patent Document 2, since the through hole through which the pin passes is arc-shaped, even when the knob is tightened, if the user applies a strong force to the main body in the tilting direction, the bracket abutting the pin presses the pin with a strong force, which may cause the pin to be slightly displaced along the arc shape of the through hole. Such a displacement means that the abutment position between the side of the pin and the side of the bracket changes. For this reason, there is a risk that the tilt angle cannot be positioned with high accuracy. Alternatively, in order to position the tilt position, the user needs to apply a moderate force to the main body so that excessive force does not act on the pin.

[0011] It would therefore be desirable to provide a portable cutting machine having a new type of tilt angle positioning mechanism that can alleviate at least some of the problems discussed above.

[0012] This specification discloses a portable cutting machine. The portable cutting machine may include a base, a main body having a blade configured to rotate, and an angular plate disposed in front of or behind the main body, the angular plate supporting the main body so as to be tiltable about a tilt axis extending in the front-rear direction, a fixing mechanism configured to fix the tilt angle of the main body relative to the base at any angle between a minimum tilt angle and a maximum tilt angle, and a tilt angle positioning mechanism for positioning the tilt angle at a predetermined tilt angle. The angular plate may include at least one hole penetrating in the front-rear direction at a position corresponding to the predetermined tilt angle. The tilt angle positioning mechanism may include at least one pin inserted in at least one hole displaceable in the front-rear direction between a non-restricted position and a restricted position protruding in a direction closer to the main body than the non-restricted position and not displaceable in a direction perpendicular to the front-rear direction. When the at least one pin is in the non-restricted position, the at least one pin may not abut against the main body portion. When the tilt angle is a predetermined tilt angle and one of the at least one pin is in the restricted position, a side surface of the one pin may abut against the main body portion to restrict tilting of the main body portion in a direction to increase the tilt angle.

[0013] The phrase "impossible to displace in a direction perpendicular to the front-rear direction" is intended to exclude any displacement that would adversely affect the accuracy of the positioning of the inclination angle. Therefore, even if at least one pin is displaced in a direction perpendicular to the front-rear direction within a small clearance range required for inserting at least one pin into at least one hole and displacing at least one pin in the front-rear direction, such displacement is included in the range of "impossible to displace in a direction perpendicular to the front-rear direction."

[0014] According to this portable cutting machine, when a user tilts the main body with respect to the base while one pin is in the restricted position, the one pin abuts against the main body at a predetermined tilt angle, so that tilting of the main body in a direction to increase the tilt angle is restricted. Therefore, the tilt angle can be easily set to the predetermined tilt angle. Moreover, at least one pin cannot be displaced in a direction perpendicular to the front-rear direction, and at the predetermined tilt angle, the one pin abuts against the main body with its side surface. Therefore, even if a user applies a strong force to the main body in the tilt direction, the abutment state is not released and the abutment position is not changed. In other words, the tilt angle can be set to the predetermined tilt angle with high precision.

[0015] This specification further discloses a portable cutting machine. The portable cutting machine may include a base, a main body having a blade configured to rotate, and an angular plate disposed in front of or behind the main body, the angular plate supporting the main body so as to be tiltable about a tilt axis extending in the front-rear direction, a fixing mechanism configured to fix the tilt angle of the main body relative to the base to any angle between a minimum tilt angle and a maximum tilt angle, and a tilt angle positioning mechanism for positioning the tilt angle at at least two predetermined tilt angles. The angular plate may include at least two holes penetrating in the front-rear direction, at positions corresponding to the at least two predetermined tilt angles. The tilt angle positioning mechanism may include at least two pins inserted in the at least two holes so as to be displaceable in the front-rear direction between a non-restricted position and a restricted position protruding in a direction closer to the main body than the non-restricted position. The at least two pins may be configured to be switchable between a state in which only one pin arbitrarily selected from the at least two pins is located in the restricting position and a state in which all of the at least two pins are located in the non-restricting position. When the at least two pins are in the non-restricting position, the at least two pins may not engage with the main body. When the inclination angle is one of at least two predetermined inclination angles and one of the at least two pins is in the restricting position, the one pin may engage with the main body to restrict tilting of the main body.

[0016] According to this portable cutting machine, at least two pins are disposed at positions corresponding to at least two predetermined inclination angles, respectively. Moreover, at least two pins are exclusively positioned at the restricting position. In other words, two or more pins are not positioned at the restricting position at the same time. Therefore, one pin at the restricting position engages with the main body only at the predetermined inclination angle corresponding to that one pin in the process of inclining the main body from the minimum inclination angle to the maximum inclination angle. In other words, one pin at the restricting position does not engage with the main body at multiple locations (at each of the multiple predetermined inclination angles). Therefore, it is easy for the user to know at which of the multiple predetermined inclination angles the inclination angle is positioned. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view of a circular saw according to a first embodiment. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 13 is an exploded perspective view of the angular plate and tilt angle positioning mechanism. [Figure 6] FIG. [Figure 7] FIG. 13 is a front view of the angular plate and its periphery when the inclination angle is set to 22.5 degrees. [Figure 8] FIG. 11 is a cross-sectional view showing the positions of the first pin and the second pin when the inclination angle is set to 22.5 degrees. [Figure 9] FIG. 13 is a cross-sectional view of the angular plate and the bracket when the inclination angle is set to 22.5 degrees. [Figure 10] FIG. 13 is a front view of the angular plate and its periphery when the inclination angle is set to 45 degrees. [Figure 11] 11 is a cross-sectional view showing the positions of the first pin and the second pin when the inclination angle is set to 45 degrees. FIG. [Figure 12]FIG. 11 is a cross-sectional view of the angular plate and the bracket when the inclination angle is set to 45 degrees. [Figure 13] FIG. 11 is a cross-sectional view of the angular plate and the bracket when the inclination angle is set to the maximum inclination angle. [Figure 14] FIG. 11 is a cross-sectional view of the angular plate and the bracket when the inclination angle is set to the maximum inclination angle. [Figure 15] FIG. 11 is a cross-sectional view of the angular plate and the bracket when the inclination angle is set to the maximum inclination angle. [Figure 16] FIG. 11 is a front view of the periphery of an angular plate according to the second embodiment. [Figure 17] FIG. 13 is a perspective view of the angular plate and the bracket when the inclination angle is set to 15 degrees. [Figure 18] FIG. 13 is a perspective view of the angular plate and the bracket when the inclination angle is set to 22.5. [Figure 19] FIG. 13 is a perspective view of the angular plate and the bracket when the inclination angle is set to 30 degrees. [Figure 20] FIG. 13 is a perspective view of the angular plate and the bracket when the inclination angle is set to 45 degrees. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Representative and non-limiting examples of the present invention will now be described in detail with reference to the drawings. This detailed description is intended simply to provide those skilled in the art with details for implementing preferred examples of the present invention, and is not intended to limit the scope of the present invention. In addition, the additional features and inventions disclosed below can be used separately or together with other features and inventions to provide further improved devices, methods of making and using the same.

[0019] Furthermore, the combinations of features and steps disclosed in the following detailed description are not essential to the practice of the invention in its broadest sense, but are specifically described only to illustrate representative embodiments of the invention. Furthermore, the various features of the representative embodiments described above and below, and the various features of those described in the independent and dependent claims, do not have to be combined in the exact embodiments described herein, or in the exact order listed, to provide additional and useful embodiments of the invention.

[0020] All features described in the specification and / or claims are intended to be disclosed individually and independently of one another as limitations to the original disclosure and claimed particulars, apart from any configuration of the features described in the embodiments and / or claims. Furthermore, all numerical ranges and group or aggregate descriptions are intended to disclose their intermediate configurations as limitations to the original disclosure and claimed particulars.

[0021] In one or more embodiments, the inclination angle positioning mechanism may include an operating member attached to the angular plate so as to be displaceable by manual operation in a predetermined direction on a plane perpendicular to the front-rear direction, and a biasing member disposed between the angular plate and the operating member and biasing at least one pin toward the non-restricted position. The operating member may include a non-pressing portion facing the angular plate, and a pressing portion facing the angular plate and protruding in a direction closer to the angular plate than the non-pressing portion, the pressing portion being located at a position different from the non-pressing portion with respect to the displacement direction of the operating member. When the operating member is in a position where the pressing portion and the at least one pin are opposed to each other, the pressing portion may press the at least one pin to the restricted position against the biasing force of the biasing member. When the operating member is in a position where the non-pressing portion and the at least one pin are opposed to each other, the at least one pin may be positioned in the non-restricted position by the biasing force of the biasing member. With this configuration, the inclination angle can be easily positioned by a simple operation of displacing the operating member in a predetermined direction.

[0022] In one or more embodiments, the operating member may include an inclined portion that connects the pressing portion and the non-pressing portion by an inclined surface. According to this configuration, at least one pin is gradually displaced between the restricted position and the non-restricted position in accordance with the displacement of the operating member, so that the biasing force of the biasing member gradually changes. In other words, the operating resistance when displacing the operating member gradually changes. Therefore, the user can smoothly perform the displacement operation of the operating member.

[0023] In one or more embodiments, the operating member may be configured to be rotatable. That is, the predetermined direction may be a rotation direction. This configuration makes it easy to operate the operating member and provides a stable displacement operation.

[0024] In one or more embodiments, the predetermined tilt angle may include a first tilt angle and a second tilt angle. The at least one hole may include a first hole arranged at a position corresponding to the first tilt angle and a second hole arranged at a position corresponding to the second tilt angle. The at least one pin may include a first pin inserted into the first hole and a second pin inserted into the second hole. The first pin and the second pin may be configured to be switchable between a state in which only the first pin is located at the restricting position, a state in which only the second pin is located at the restricting position, and a state in which both the first pin and the second pin are located at the non-restricting position. With this configuration, the tilt angle can be accurately positioned to a desired tilt angle among a plurality of predetermined tilt angles.

[0025] In one or more embodiments, at least one of the pressing portion and the non-pressing portion may have a recess having a shape that engages with at least one pin. With this configuration, the user can easily understand that the displacement position of the operating member is in an appropriate position corresponding to the restricted position and / or the non-restricted position by the engagement of the at least one pin with the recess. In other words, a sense of moderation regarding the operation of the operating member is obtained, and the operability of the operating member is improved.

[0026] In one or more embodiments, the predetermined inclination angle may include a first inclination angle and a second inclination angle. The at least one hole may include a first hole disposed at a position corresponding to the first inclination angle and a second hole disposed at a position corresponding to the second inclination angle. The at least one pin may include a first pin inserted into the first hole and a second pin inserted into the second hole. The first pin and the second pin may be configured to be switchable between a state in which only the first pin is located at the restricting position, a state in which only the second pin is located at the restricting position, and a state in which both the first pin and the second pin are located at the non-restricting position. Each of the pressing portion and the non-pressing portion may have a recess having a shape that engages with the at least one pin. The inclination angle positioning mechanism may be configured such that when one of the first pin and the second pin is in the restricting position and engages with the recess of the pressing portion, the other of the first pin and the second pin is in the non-restricting position and engages with the recess of the non-pressing portion. With this configuration, when the operating member is operated to place the first pin in the restricted position, the pin and the recess engage at two points, which increases the sense of moderation and further improves the operability of the operating member. Moreover, the operating resistance when disengaging the pin and the recess is not biased to only one point in the displacement direction of the operating member, so the disengagement operation can be performed more stably.

[0027] In one or more embodiments, the predetermined tilt angle may include a first tilt angle and a second tilt angle. The at least one hole may include a first hole arranged at a position corresponding to the first tilt angle and a second hole arranged at a position corresponding to the second tilt angle. The at least one pin may include a first pin inserted into the first hole and a second pin inserted into the second hole. The first pin and the second pin may be configured to be switchable between a state in which only the first pin is located at the restricted position, a state in which only the second pin is located at the restricted position, and a state in which both the first pin and the second pin are located at the non-restricted position. The non-pressing portion may have a first recess and a second recess having a shape that engages with the at least one pin. The tilt angle positioning mechanism may be configured such that when both the first pin and the second pin are in the non-restricted position and the first pin engages with the first recess, the second pin engages with the second recess. With this configuration, when the operating member is operated to place both the first pin and the second pin in the non-restricted position, the pin and the recess engage at two points, which increases the sense of moderation and further improves the operability of the operating member. Moreover, the operating resistance when disengaging the pin and the recess is not biased to only one point in the displacement direction of the operating member, so the disengagement operation can be performed more stably.

[0028] In one or more embodiments, the angular plate may include a protrusion that protrudes toward the body. When the tilt angle is at the maximum tilt angle and each of the at least one pin is in a non-restricted position, a side surface of the protrusion may come into contact with the body, restricting tilting of the body in a direction that increases the tilt angle. With this configuration, the tilt angle can be easily set to the maximum tilt angle without complicating the structure of the operating member.

[0029] In one or more embodiments, the predetermined inclination angle may include three or more inclination angles. The at least one hole may include three or more holes arranged at positions corresponding to the three or more inclination angles, respectively. The at least one pin may include three or more pins inserted into the three or more holes, respectively. The three or more pins may be configured to be switchable between a state in which only one pin arbitrarily selected from the three or more pins is located in a restricting position and a state in which all of the three or more pins are located in a non-restricting position. According to this configuration, the number of the predetermined inclination angles can be increased to a desired number of three or more. Therefore, the convenience of the user is improved.

[0030] Hereinafter, the portable circular saw 10 (hereinafter, simply referred to as a circular saw) according to an exemplary first embodiment will be described in more detail with reference to Figs. 1 to 15. In the following description, the side on which the circular saw 10 advances when a user holds the circular saw 10 in his / her hand to cut a workpiece (the side on which cutting is advanced by a cutting tool 35, which will be described later, and is also referred to as the cutting direction) is defined as the front side, and the opposite side is defined as the rear side. In addition, the side located vertically above is defined as the upper side, and the opposite side is defined as the lower side. Furthermore, the direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction. In the left-right direction, the right side when viewed from the rear side to the front side is defined as the right side, and the opposite side is defined as the left side.

[0031] As shown in Fig. 1, the circular saw 10 includes a base 20 and a main body 30. The base 20 has a generally rectangular outer shape. The longitudinal direction of the base 20 is the front-rear direction. The base 20 includes a flat lower surface for contacting the workpiece when cutting the workpiece.

[0032] 1, the main body 30 is basically disposed on the upper side of the base 20. As shown in FIGS. 1 to 3, the main body 30 includes a motor housing 11, a gear housing 12, a battery mounting portion 13, a handle 14, an electric motor 31, a cutting tool 35, a fixed cover 33, and a movable cover 34.

[0033] As shown in FIG. 1, a part of the cutting tool 35 penetrates the through hole 21 of the base 20 and protrudes below the base 20. The cutting tool 35 is also called a tip saw and has a substantially circular shape. The cutting tool 35 is configured to rotate about a rotation axis extending in the left-right direction by a rotation driving force provided by the electric motor 31. The fixed cover 33 covers the upper part of the cutting tool 35 in an arc shape. The movable cover 34 covers the cutting tool 35 below the fixed cover 33. The movable cover 34 is configured to be able to move back along the outer periphery of the cutting tool 35, and is normally biased toward the position shown in FIG. 1 by a biasing member (not shown). When the circular saw 10 is in use, the cutting tool 35 is pressed by the material to be cut and moves back, thereby exposing the part of the cutting tool 35 located below the base 20.

[0034] The gear housing 12 is disposed on the right side of the fixed cover 33. A mechanical mechanism (spindle, reduction gear, etc.) for transmitting the rotational driving force of the electric motor 31 to the cutting tool 35 is accommodated in the gear housing 12. As shown in FIG. 3, the motor housing 11 is disposed on the right side of the gear housing 12. The electric motor 31 is accommodated in the motor housing 11. A battery mounting section 13 is disposed behind the motor housing 11 and the gear housing 12. A battery 15 for supplying power to the electric motor 31 is removably mounted in the battery mounting section 13. An arch-shaped handle 14 is disposed above the gear housing 12. A switch lever 32 for starting and stopping the electric motor 31 is provided on the handle 14.

[0035] When using the circular saw 10, when a user presses the switch lever 32, the cutting tool 35 rotates due to the driving force of the electric motor 31. In this state, the user brings the lower surface of the base 20 (the portion forward of the cutting tool 35) into contact with the workpiece and moves the circular saw 10 forward. As a result, the cutting tool 35 protrudes downward beyond the lower surface of the base 20, cutting the workpiece in the movement direction of the circular saw 10 (i.e., the cutting direction).

[0036] In such a circular saw 10, the main body 30 including the cutting tool 35 is configured to be tiltable relative to the base 20 about a tilt axis AX (see FIG. 9) extending in the front-rear direction. In this embodiment, the tilt axis AX is located above the base 20, but it may be located below the base 20. With this configuration, the workpiece can be cut obliquely. The configuration for cutting the workpiece obliquely will be described below.

[0037] As shown in Figs. 1 to 4, the circular saw 10 includes an angular plate 50. In this embodiment, the angular plate 50 is located in front of the main body 30. However, the angular plate 50 may be located behind the main body 30. The angular plate 50 is fixed to the base 20 so as to extend upward from the base 20. As shown in Figs. 1, 4, and 5, the angular plate 50 has a substantially fan shape. A through hole 51 is formed in the angular plate 50 along its arc-shaped upper peripheral edge. The through hole 51 has an arc-shaped shape along the upper peripheral edge, and penetrates the angular plate 50 in the front-rear direction.

[0038] The main body 30 includes a bracket 40. The bracket 40 is a member for attaching the main body 30 to the base 20, and is disposed adjacent to the angular plate 50 and on the rear side of the angular plate 50, as shown in Figs. 1, 8 and 9. As shown in Fig. 9, the bracket 40 includes a support portion 42 at one end (left end) in the longitudinal direction. The support portion 42 has a bifurcated shape that protrudes upward. As shown in Fig. 8, the support portion 42 includes two through holes 44 that are coaxially arranged.

[0039] 1 and 4, the front and lower edge portion 36 of the fixed cover 33 is inserted into the through hole 44. The edge portion 36 has a through hole (not shown) coaxial with the through hole 44. A bolt 48 is inserted from the left side into the two through holes 44 and the through hole of the edge portion 36, and a nut 49 (see FIG. 3) is attached to the tip of the bolt 48. The bracket 40 is fixed to the fixed cover 33 by tightening the nut 49.

[0040] As shown in FIG. 9, the angular plate 50 has a shaft portion 52 on its left and lower edge. The shaft portion 52 protrudes in a cylindrical shape toward the rear. The bracket 40 has a through hole 45 below the support portion 42. The through hole 45 has a size and shape that fits the shaft portion 52. The bracket 40 is attached to the angular plate 50 so that the shaft portion 52 of the angular plate 50 passes through the through hole 45 of the bracket 40. In this way, the angular plate 50 supports one end of the bracket 40 (and thus the main body portion 30). In addition, with this configuration, the bracket 40 (and thus the main body portion 30) is configured to be tiltable about the tilt axis AX relative to the angular plate 50 (and thus the base 20 to which the angular plate 50 is fixed). This makes it possible to change the tilt angle of the main body portion 30 including the cutting tool 35 relative to the base 20 (hereinafter also simply referred to as the tilt angle).

[0041] The inclination angle can be changed arbitrarily between the minimum inclination angle and the maximum inclination angle. The minimum inclination angle is 0 degrees, and at this time, the cutting tool 35 is perpendicular to the base 20 as shown in Figures 1 and 4. The maximum inclination angle is 50 degrees in this embodiment, but can be set to any angle.

[0042] 9, bracket 40 has a fixing portion 43 at the other end (right end) in the longitudinal direction. Fixing portion 43 has a through hole 46 that passes through bracket 40 in the front-rear direction. This through hole 46 is used to fix the inclination angle.

[0043] Specifically, as shown in FIG. 1, the circular saw 10 includes a fixing mechanism 60. The fixing mechanism 60 includes a bolt 61, a nut 62, and a fixing lever 63. The bolt 61 is inserted from the rear side so as to penetrate the through hole 46 of the bracket 40 and the through hole 51 of the angular plate 50. A nut 62 is attached to the tip of the bolt 61, and a fixing lever 63 is attached to the outer periphery of the nut 62. When the user loosens the fixing lever 63, the main body 30 can be tilted to any angle between the minimum tilt angle and the maximum tilt angle with respect to the base 20. Since the through hole 51 of the angular plate 50 has an arc shape, the displacement of the bolt 61 during such tilting operation can be guided. The tilt position of the main body 30 at which the tilt angle becomes the minimum tilt angle is determined by the bolt 61 abutting against the lower edge 57 (see FIG. 5) of the inner surface forming the through hole 51 of the angular plate 50.

[0044] When the user operates the fixing lever 63 to tighten the nut 62 with the main body 30 tilted at a desired tilt angle, the angular plate 50 and the bracket 40 (more specifically, the fixing portion 43) are fastened in the front-rear direction by the head of the bolt 61 and the nut 62. This fixes the positional relationship between the bracket 40 and the angular plate 50, and fixes the tilt angle at a desired tilt angle. At this time, the angular plate 50 supports the bracket 40 (and thus the main body 30) via the fixing mechanism 60.

[0045] To assist the user in fixing the bevel angle in this manner, the circular saw 10 includes a bevel angle positioning mechanism 70. The bevel angle positioning mechanism 70 is used to position the bevel angle at high frequency bevel angles (which, as discussed above, are bevel angles that are used frequently). In this embodiment, the high frequency bevel angles are 22.5 degrees and 45 degrees. The bevel angle positioning mechanism 70 is described in detail below.

[0046] As shown in FIG. 5, the tilt angle positioning mechanism 70 includes an operating member 71, a first pin 74, a second pin 75, a shoulder screw 76, a first biasing member 85, and a second biasing member 86. The operating member 71 is attached to the angular plate 50 so as to be displaceable by manual operation in a predetermined direction on a plane perpendicular to the front-rear direction. In this embodiment, the predetermined direction is a rotation direction centered on a rotation axis extending in the front-rear direction. Specifically, a through hole 84 extending in the front-rear direction is formed in the center of the substantially circular operating member 71. The shoulder screw 76 is attached so as to pass through this through hole 84 and the through hole 56 formed in the angular plate 50, so that the operating member 71 is attached to the angular plate 50 so as to be rotatable around the shoulder screw 76.

[0047] As shown in Fig. 5, the angular plate 50 has a first through hole 54 and a second through hole 55 penetrating the angular plate 50 in the front-rear direction on both sides of the through hole 56. As will be described in detail later, the first through hole 54 is located at a position corresponding to an inclination angle of 22.5 degrees (a position for setting the inclination angle to 22.5 degrees), and the second through hole 55 is located at a position corresponding to an inclination angle of 45 degrees (a position for setting the inclination angle to 45 degrees). As shown in Figs. 5 and 8, a first pin 74 and a second pin 75 are inserted into the first through hole 54 and the second through hole 55, respectively.

[0048] The first pin 74 and the second pin 75 are displaceable in the front-rear direction within the first through hole 54 and the second through hole 55, respectively. Meanwhile, the first through hole 54 and the second through hole 55 have shapes and sizes that fit the first pin 74 and the second pin 75, respectively, and the first pin 74 and the second pin 75 are inserted into the first through hole 54 and the second through hole 55, respectively, with a slight clearance required for insertion into the first through hole 54 and the second through hole 55 and displacement in the front-rear direction. For this reason, the first pin 74 and the second pin 75 are substantially immovable in a direction perpendicular to the front-rear direction.

[0049] As shown in Figs. 5 and 8, the first biasing member 85 and the second biasing member 86 are disposed in a compressed state between the angular plate 50 and the operating member 71. More specifically, the first biasing member 85 is disposed between a spring seat formed in the first through hole 54 and the head of the first pin 74 (this is the enlarged front end). Similarly, the second biasing member 86 is disposed between a spring seat formed in the second through hole 55 and the head of the second pin 75. The first biasing member 85 and the second biasing member 86 constantly bias the first pin 74 and the second pin 75 forward.

[0050] As shown in FIG. 4, marks related to high-frequency tilt angles are provided on the front surface of the angular plate 50. Specifically, high-frequency tilt angles of 45 degrees and 22.5 degrees are provided on the upper and lower portions of the operating member 71, respectively. Also, marks representing unlocking are provided on the right and left portions of the operating member 71. Also, a triangular mark 87 is provided on the front surface of the operating member 71 to represent the rotation angle position of the operating member 71. The user rotates the operating member 71 so that the triangular mark 87 of the operating member 71 points to the mark of the desired high-frequency tilt angle. FIG. 4 illustrates an example in which the triangular mark 87 of the operating member 71 is in a position indicating a high-frequency tilt angle of 45 degrees. If the user does not wish to use the tilt angle positioning mechanism 70 for positioning, the user rotates the operating member 71 so that the triangular mark 87 points to the mark representing unlocking (either the left or right mark).

[0051] As shown in FIG. 6, the operating member 71 has a pressing portion 77, a non-pressing portion 78, and two inclined portions 79 on its rear side (i.e., on the side facing the angular plate 50). The pressing portion 77, the non-pressing portion 78, and the inclined portion 79 are located at different positions from each other in the displacement direction (rotation direction in this embodiment) of the operating member 71. The pressing portion 77 protrudes rearward (i.e., in the direction approaching the angular plate 50) from the non-pressing portion 78. In other words, the non-pressing portion 78 is recessed forward from the pressing portion 77. In this embodiment, the pressing portion 77 is in the form of a plane parallel to a direction perpendicular to the front-rear direction, and the non-pressing portion 78 is in the form of a recess recessed forward. However, the non-pressing portion 78 may be in the form of a plane parallel to a direction perpendicular to the front-rear direction, and the pressing portion 77 may be in the form of a plane located rearward from the non-pressing portion 78. Alternatively, the pressing portion 77 and the non-pressing portion 78 may be in the form of a cam in which the pressing portion 77 protrudes rearward beyond the non-pressing portion 78 .

[0052] The two inclined portions 79 are located on either side of the pressing portion 77 in the rotational direction of the operating member 71. Each of the inclined portions 79 connects the pressing portion 77 and the non-pressing portion 78 via an inclined surface. More specifically, the inclined portion 79 in the form of an inclined surface connects the pressing portion 77 and the non-pressing portion 78 with a uniform gradient so as to compensate for the difference in the positions of the pressing portion 77 and the non-pressing portion 78 in the front-rear direction.

[0053] 6, a first recess 80 is formed in the pressing portion 77. Moreover, a second recess 81, a third recess 82, and a fourth recess 83 are formed in the non-pressing portion 78. These recesses have a size and shape that allow the tips (rear ends) of the first pin 74 and the second pin 75 to engage with (fit into). In this embodiment, these recesses have a substantially conical shape. However, the shape of these recesses can be any shape as long as the tips of the first pin 74 and the second pin 75 can fit into them. In this embodiment, the first recess 80 is smaller than the second recess 81, the third recess 82, and the fourth recess 83 (in other words, it has a gentle slope).

[0054] The tilt angle positioning mechanism 70 having such a configuration is used as follows. First, a case where the tilt angle is set to 22.5 degrees, which is one of the high-frequency tilt angles, will be described. In this case, the user first rotates the operating member 71 to a position indicating the high-frequency tilt angle of 22.5 degrees, as shown in FIG. 7. When the operating member 71 is rotated to the position shown in FIG. 7, the first pin 74 fits into the first recess 80 of the pressing portion 77, and the second pin 75 fits into the third recess 82 of the non-pressing portion 78, thereby providing a sense of moderation (click feeling). In this state, the second pin 75 is located in a position facing the non-pressing portion 78, which is deeper than the pressing portion 77, and is therefore located in a position where it cannot interfere with (cannot abut against) the bracket 40 due to the biasing force of the second biasing member 86, as shown in FIG. The position of the second pin 75 at this time is also called the non-restricted position.

[0055] On the other hand, since the first pin 74 is located in a position facing the pressing portion 77 protruding rearward (toward the bracket 40) from the non-pressing portion 78, as shown in FIG. 8, the pressing portion 77 presses the first pin 74 rearward against the biasing force of the first biasing member 85. As a result, the first pin 74 is located in a position protruding rearward (i.e., in a direction approaching the bracket 40) by a distance corresponding to the difference in the positions of the non-pressing portion 78 and the pressing portion 77 in the front-rear direction compared to the second pin 75. The position of the first pin 74 at this time is also called a restricting position. When the first pin 74 is in the restricting position, the first pin 74 is located in a position where it can interfere with (come into contact with) the bracket 40.

[0056] In this state, when the user loosens the fixing lever 63 and tilts the main body 30 from the position corresponding to the minimum tilt angle to the position corresponding to the maximum tilt angle, the upper side surface 41 of the bracket 40 abuts against the side surface of the first pin 74 as shown in Figs. 8 and 9. This restricts the bracket 40 (and thus the main body 30) from moving in a direction that further increases the tilt angle. In this state, the user tightens the fixing lever 63 to fix the tilt angle. The positions of the first through hole 54 and the first pin 74 are previously positioned so that the tilt angle is 22.5 degrees when the upper side surface 41 of the bracket 40 abuts against the side surface of the first pin 74. Therefore, the user can easily position the tilt angle of the main body 30 to 22.5 degrees by the above procedure.

[0057] 9, a recess 47 is formed in the upper side surface 41 of the bracket 40. When the upper side surface 41 of the bracket 40 abuts against the side surface of the first pin 74, the first pin 74 fits into the recess 47. With this configuration, the upper side surface 41 and the side surface of the first pin 74 can be abutted against each other more stably and at the same position.

[0058] Next, a case where the tilt angle is set to 45 degrees, which is another high-frequency tilt angle, will be described. In this case, the user first rotates the operating member 71 to a position indicating the high-frequency tilt angle of 45 degrees, as shown in FIG. 10. When the operating member 71 rotates to the position shown in FIG. 10, the first pin 74 fits into the third recess 82 of the non-pressing portion 78, and the second pin 75 fits into the first recess 80 of the pressing portion 77, providing a sense of moderation (click feeling). In this state, the first pin 74 is in a position facing the non-pressing portion 78, and is therefore positioned in the non-restricted position by the biasing force of the second biasing member 86, as shown in FIG.

[0059] On the other hand, since the second pin 75 is located opposite the pressing portion 77, as shown in Fig. 11, the pressing portion 77 presses the second pin 75 rearward against the biasing force of the second biasing member 86. As a result, the second pin 75 is located in the restricted position.

[0060] In this state, when the user loosens the fixing lever 63 and tilts the main body 30 from the position corresponding to the minimum tilt angle to the position corresponding to the maximum tilt angle, the upper side surface 41 of the bracket 40 abuts against the side surface of the second pin 75 as shown in FIG. 11 and FIG. 12. At this time, the second pin 75 fits into the recess 47 of the operating member 71. This restricts the bracket 40 (and thus the main body 30) in the direction in which the tilt angle is further increased. In this state, the user tightens the fixing lever 63 to fix the tilt angle. The positions of the second through hole 55 and the second pin 75 are previously positioned so that the tilt angle is 45 degrees when the upper side surface 41 of the bracket 40 abuts against the side surface of the second pin 75. Therefore, the user can easily position the tilt angle of the main body 30 to 45 degrees by the above procedure.

[0061] Next, a case where the inclination angle is set to the maximum inclination angle (50 degrees in this embodiment) will be described. In this case, the user first rotates the operating member 71 to a position that points to the unlocking mark as shown in FIG. 13. FIG. 13 shows an example where the operating member 71 is rotated to a position that points to the right mark of the two unlocking marks, but the operating member 71 may be rotated to a position that points to the left mark. When the operating member 71 is rotated to the position shown in FIG. 13, the first pin 74 fits into the second recess 81 of the non-pressing portion 78, and the second pin 75 fits into the fourth recess 83 of the non-pressing portion 78, thereby providing a sense of moderation (click feeling). In this state, the first pin 74 and the second pin 75 are in a position facing the non-pressing portion 78, and therefore, as shown in FIG. 14, they are positioned in the non-restricted position by the biasing forces of the first biasing member 85 and the second biasing member 86.

[0062] In this state, when the user loosens the fixing lever 63 and tilts the main body 30 from the position corresponding to the minimum tilt angle to the position corresponding to the maximum tilt angle, the upper side surface 41 of the bracket 40 abuts against the side surface of the protruding portion 53 as shown in FIG. 14 and FIG. 15. The protruding portion 53 is a portion that protrudes rearward (toward the main body 30) from the rear surface of the angular plate 50. This restricts the bracket 40 (and thus the main body 30) from moving in a direction that further increases the tilt angle. In this state, the user tightens the fixing lever 63 to fix the tilt angle. The position of the protruding portion 53 is previously positioned so that the tilt angle becomes the maximum tilt angle when the upper side surface 41 of the bracket 40 abuts against the side surface of the protruding portion 53. Therefore, the user can easily position the tilt angle of the main body 30 to the maximum tilt angle by the above procedure. According to this configuration, simply by providing the operating member 71 with the protruding portion 53, the tilt angle can be easily set to the maximum tilt angle without complicating the structure of the operating member 71.

[0063] According to the above-described circular saw 10, the first pin 74 and the second pin 75 cannot be displaced in a direction perpendicular to the front-rear direction, and at the high-frequency tilt angle, the first pin 74 or the second pin 75 abuts on the main body 30 (more specifically, the upper side surface 41 of the bracket 40) with its side surface. Therefore, even if a user applies a strong force to the main body 30 in the tilting direction, the abutment state is not released and the abutment position is not changed. Therefore, the tilt angle can be accurately set to the high-frequency tilt angle.

[0064] Furthermore, the first pin 74 and the second pin 75 are arranged at positions corresponding to the two high-frequency tilt angles, and are exclusively positioned at the restricting position. In other words, the first pin 74 and the second pin 75 are configured to be switchable between a state in which the first pin 74 is positioned at the restricting position and the second pin 75 is positioned at the non-restricting position, a state in which the first pin 74 is positioned at the non-restricting position and the second pin 75 is positioned at the restricting position, and a state in which both the first pin 74 and the second pin 75 are positioned at the non-restricting position. Therefore, one pin at the restricting position does not engage with the main body 30 at multiple points of the bracket 40 (at each of multiple high-frequency tilt angles). For this reason, the user can easily understand which of the high-frequency tilt angles the tilt angle is positioned at.

[0065] Furthermore, the operating member 71 has a pressing portion 77 and a non-pressing portion 78, and the first pin 74 and the second pin 75 are configured to be displaced between a restricting position and a non-restricting position in accordance with the rotational position of the operating member 71, utilizing the difference in the front-to-rear positions of the pressing portion 77 and the non-pressing portion 78. Therefore, the inclination angle can be easily positioned by simply rotating the operating member 71.

[0066] Furthermore, the operating member 71 has an inclined portion 79 between the pressing portion 77 and the non-pressing portion 78. Therefore, when the operating member 71 is rotated, the first pin 74 and the second pin 75 are gradually displaced between the restricted position and the non-restricted position as the operating member 71 is rotated. This means that the biasing forces of the first biasing member 85 and the second biasing member 86 gradually change, that is, the operating resistance when displacing the operating member 71 gradually changes. Therefore, the user can smoothly perform the displacement operation of the operating member 71.

[0067] Furthermore, the first pin 74 and the second pin 75 each engage with two of the recesses 80-83 when the operating member 71 is in any of the positions shown in Figs. 7, 10, and 13. That is, the engagement relationship between the pins and the recesses is established at two points. This increases the sense of moderation when the operating member 71 is rotated, further improving the operability of the operating member 71. Moreover, when the operating member 71 is rotated from any of the positions shown in Figs. 7, 10, and 13, the operational resistance associated with disengagement between the pins and the recesses is not biased to only one point in the rotation direction of the operating member 71. This allows for a more stable disengagement operation.

[0068] A circular saw 10 according to an exemplary second embodiment will be described in detail below with reference to Figs. 16 to 20. Only the differences between the second embodiment and the first embodiment will be described below. In Figs. 17 to 20, the same components as those in the first embodiment are denoted by the same reference numerals. Also, the fixing mechanism 60 is not shown.

[0069] The circular saw according to the second embodiment includes an angular plate 150 instead of the angular plate 50. Also, the inclination angle positioning mechanism 70 includes a first pin 171, a second pin 172, a third pin 174, and a fourth pin 175 instead of the first pin 74 and the second pin 75. In this embodiment, the high frequency inclination angles are 15 degrees, 22.5 degrees, 30 degrees, and 45 degrees. For this reason, marks for these four high frequency inclination angles are provided on the front surface of the angular plate 150 as shown in FIG. 16.

[0070] As shown in FIG. 17, the angular plate 150 has a first through hole 154, a second through hole 155, a third through hole 157, and a fourth through hole 158 at four positions corresponding to high-frequency tilt angles of 15 degrees, 22.5 degrees, 30 degrees, and 45 degrees, respectively. A first pin 171, a second pin 172, a third pin 174, and a fourth pin 175 are inserted into the first through hole 154, the second through hole 155, the third through hole 157, and the fourth through hole 158, respectively. As in the first embodiment, these pins are movable in the front-rear direction between the restricted position and the non-restricted position, but are substantially immovable in a direction perpendicular to the front-rear direction. As in the first embodiment, these pins are urged toward the non-restricted position by an urging member (not shown).

[0071] 17, when the operating member 71 is in a position corresponding to the high-frequency tilt angle of 15 degrees, only the first pin 171 corresponding to 15 degrees is in the restricted position, and the other pins 172, 174, 175 are in the non-restricted positions. Therefore, when the main body 30 is tilted from the minimum tilt angle to the maximum tilt angle, the side surface of the first pin 171 abuts against the upper side surface 41 of the bracket 40, and further tilting is restricted.

[0072] 18, when the operating member 71 is in a position corresponding to the high-frequency tilt angle of 22.5 degrees, only the second pin 172 corresponding to 22.5 degrees is in the restricted position, and the other pins 171, 174, 175 are in the non-restricted positions. Therefore, when the main body 30 is tilted from the minimum tilt angle to the maximum tilt angle, the side surface of the second pin 172 abuts against the upper side surface 41 of the bracket 40, and further tilting is restricted.

[0073] 19, when the operating member 71 is in a position corresponding to a high-frequency tilt angle of 30 degrees, only the third pin 174 corresponding to 30 degrees is in the restricted position, and the other pins 171, 172, 175 are in the non-restricted positions. Therefore, when the main body 30 is tilted from the minimum tilt angle to the maximum tilt angle, the side surface of the third pin 174 abuts against the upper side surface 41 of the bracket 40, and further tilting is restricted.

[0074] 20, when the operating member 71 is in a position corresponding to the high-frequency tilt angle of 45 degrees, only the fourth pin 175 corresponding to 45 degrees is in the restricted position, and the other pins 171, 172, 174 are in the non-restricted positions. Therefore, when the main body 30 is tilted from the minimum tilt angle to the maximum tilt angle, the side surface of the fourth pin 175 abuts against the upper side surface 41 of the bracket 40, and further tilting is restricted.

[0075] According to the second embodiment described above, the tilt angle can be easily set to any one of the four high-frequency tilt angles. As is clear from the second example, the number of high-frequency tilt angles can be increased to any desired number, such as three or more.

[0076] Although several embodiments of the present invention have been described above, the above-mentioned embodiments are intended to facilitate understanding of the present invention and do not limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and the present invention includes equivalents thereof. In addition, any combination or omission of each form element described in the claims and specification is possible within the scope of solving at least a part of the above-mentioned problems or achieving at least a part of the effects.

[0077] For example, the operating member 71 may be modified to any form capable of displacing the first pin 74 and the second pin 75 (or pins 171, 172, 174, 175) between the restricted position and the non-restricted position such that only one pin can be exclusively in the restricted position. For example, a sliding type operating member may be adopted instead of the rotating type operating member 71. In this case, the operating member may have a pressing portion, a non-pressing portion, and an inclined portion (or a pressing portion and a non-pressing portion) at different positions in the sliding direction. Alternatively, a plurality of operating members each corresponding to a plurality of high-frequency inclination angles may be adopted.

[0078] Furthermore, only one high frequency tilt angle may be set and only one corresponding pin may be used.

[0079] Furthermore, the first pin 74 and the second pin 75 (or the pins 171, 172, 174, 175) may be configured to engage with any portion of the main body portion 30 instead of the bracket 40 when in the restricted position.

[0080] Furthermore, as long as the first pin 74 and the second pin 75 (or pins 171, 172, 174, 175) can be displaced between a regulating position and a non-regulating position so that only one pin can exclusively assume the regulating position, instead of a configuration in which the sides of the first pin 74 and the second pin 75 (or pins 171, 172, 174, 175) abut against the upper side surface 41 of the bracket 40, a configuration in which the first pin 74 and the second pin 75 engage with the bracket 40 in any manner may be adopted.

[0081] Furthermore, the various embodiments described above are not limited to circular saws, but can be applied to various portable cutting machines, such as cutters, that are configured so that the inclination angle of the main body with respect to the base can be changed.

[0082] The correspondence between each component of the above embodiment and each component of the present invention is shown below. However, each component of the embodiment is merely an example and does not limit each component of the present invention. The circular saw 10 is an example of a "portable cutting machine". The base 20 is an example of a "base". The cutting tool 35 is an example of a "cutting tool". The angular plate 50 is an example of an "angular plate". The fixing mechanism 60 is an example of a "fixing mechanism". The tilt angle positioning mechanism 70 is an example of an "tilt angle positioning mechanism". The first through hole 54, the second through hole 55, the first through hole 154, the second through hole 155, the third through hole 157, and the fourth through hole 158 are examples of "at least one hole". The first pin 74, the second pin 75, the first pin 171, the second pin 172, the third pin 174, and the fourth pin 175 are examples of "at least one pin". The operating member 71 is an example of an "operating member". The first biasing member 85 and the second biasing member 86 are an example of an "biasing member". The pressing portion 77 is an example of a "pressing portion". The non-pressing portion 78 is an example of a "non-pressing portion". The inclined portion 79 is an example of an "inclined portion". The first recess 80, the second recess 81, the third recess 82, and the fourth recess 83 are examples of "recesses". The protruding portion 53 is an example of a "protruding portion". [Explanation of symbols]

[0083] 10...Portable circular saw 11...Motor housing 12...Gear housing 13... Battery compartment 14...Handle 15...Battery 20...Base 21...Through hole 30...Main body 31...Electric motor 32...Switch lever 33...Fixed cover 34... Movable cover 35...cutting tools 36...Edge 40...Bracket 41...Upper side 42...Support part 43...Fixed part 44, 45, 46...Through holes 47...Recess 48...Volts 49...Nut 50...Angular plate 51...Through hole 52...Shaft 53...Protrusion 54...First through hole 55...Second through hole 56...Through hole 57...lower edge 60...Fixing mechanism 61...Bolt 62...Nut 63...Fixed lever 70...Tilt angle positioning mechanism 71...Operating parts 74...First pin 75...Second pin 76...Screw 77...Pressing part 78...Non-pressure part 79...slanted part 80...First recess 81...Second recess 82...Third recess 83...4th recess 84...Through hole 85...First biasing member 86...Second biasing member 87...Mark 150...Angular plate 154...First through hole 155...Second through hole 157...Third through hole 158...4th through hole 171...first pin 172...Second pin 174...Third pin 175...4th pin AX...Tilt axis

Claims

1. A portable cutting machine, With the base, a body having a cutting tool configured to rotate; a front side is defined as a side along which the portable cutting machine advances when the cutting tool cuts the workpiece, and a rear side is defined as an opposite side to the front side; an angular plate is disposed forward or rearward of the main body, and supports the main body so as to be tiltable about a tilt axis extending in the front-rear direction; a fixing mechanism configured to be able to fix the inclination angle of the main body portion with respect to the base at any angle between a minimum inclination angle and a maximum inclination angle; a tilt angle positioning mechanism for positioning the tilt angle at a predetermined tilt angle; Equipped with the angular plate has at least one hole penetrating in the front-rear direction at a position corresponding to the predetermined inclination angle, the tilt angle positioning mechanism includes at least one pin that is inserted into the at least one hole and is displaceable in the front-rear direction between a non-restricted position and a restricted position that protrudes in a direction closer to the main body than the non-restricted position, and is not displaceable in a direction perpendicular to the front-rear direction; When the at least one pin is in the non-restricted position, the at least one pin does not abut the main body portion, When the inclination angle is the predetermined inclination angle and one of the at least one pin is in the restricted position, a side surface of the one pin abuts against the main body portion, and tilting of the main body portion in a direction to increase the inclination angle is restricted. Portable cutting machine.

2. 2. The portable cutting machine of claim 1, The tilt angle positioning mechanism includes: an operating member attached to the angular plate so as to be manually displaceable in a predetermined direction on a plane perpendicular to the front-rear direction; a biasing member disposed between the angular plate and the operating member and biasing the at least one pin toward the non-restricted position; Equipped with the operating member includes a non-pressing portion facing the angular plate, and a pressing portion facing the angular plate and protruding in a direction closer to the angular plate than the non-pressing portion, the pressing portion being located at a position different from the non-pressing portion in the displacement direction of the operating member, When the operating member is in a position where the pressing portion and the at least one pin face each other, the pressing portion presses the at least one pin to the regulating position against the biasing force of the biasing member, When the operating member is in a position where the non-pressing portion faces the at least one pin, the at least one pin is positioned in the non-restricted position by the biasing force of the biasing member. Portable cutting machine.

3. 3. The portable cutting machine of claim 2, The operating member includes an inclined portion that connects the pressing portion and the non-pressing portion with an inclined surface. Portable cutting machine.

4. A portable cutting machine according to claim 2 or 3, The operating member is configured to be rotatable. Portable cutting machine.

5. A portable cutting machine according to any one of claims 1 to 3, the predetermined tilt angle includes a first tilt angle and a second tilt angle, the at least one hole includes a first hole disposed at a position corresponding to the first tilt angle and a second hole disposed at a position corresponding to the second tilt angle; the at least one pin includes a first pin inserted into the first hole and a second pin inserted into the second hole; The first pin and the second pin are configured to be switchable among a state in which only the first pin is located at the restricting position, a state in which only the second pin is located at the restricting position, and a state in which both the first pin and the second pin are located at the non-restricting position. Portable cutting machine.

6. A portable cutting machine according to claim 2 or 3, At least one of the pressing portion and the non-pressing portion has a recess having a shape that engages with the at least one pin. Portable cutting machine.

7. A portable cutting machine according to claim 2 or 3, the predetermined tilt angle includes a first tilt angle and a second tilt angle, the at least one hole includes a first hole disposed at a position corresponding to the first tilt angle and a second hole disposed at a position corresponding to the second tilt angle; the at least one pin includes a first pin inserted into the first hole and a second pin inserted into the second hole; the first pin and the second pin are configured to be switchable among a state in which only the first pin is located at the restricting position, a state in which only the second pin is located at the restricting position, and a state in which both the first pin and the second pin are located at the non-restricting position; each of the pressing portion and the non-pressing portion has a recess having a shape that engages with the at least one pin; The inclination angle positioning mechanism is configured such that, when one of the first pin and the second pin is in the restricted position and engages with the recess of the pressing portion, the other of the first pin and the second pin is in the non-restricted position and engages with the recess of the non-pressing portion. Portable cutting machine.

8. A portable cutting machine according to claim 2 or 3, the predetermined tilt angle includes a first tilt angle and a second tilt angle, the at least one hole includes a first hole disposed at a position corresponding to the first tilt angle and a second hole disposed at a position corresponding to the second tilt angle; the at least one pin includes a first pin inserted into the first hole and a second pin inserted into the second hole; the first pin and the second pin are configured to be switchable among a state in which only the first pin is located at the restricting position, a state in which only the second pin is located at the restricting position, and a state in which both the first pin and the second pin are located at the non-restricting position; the non-pressing portion has a first recess and a second recess having a shape that engages with the at least one pin; The tilt angle positioning mechanism is configured such that when both the first pin and the second pin are in the non-restricted position and the first pin engages with the first recess, the second pin engages with the second recess. Portable cutting machine.

9. A portable cutting machine according to any one of claims 1 to 3, The angular plate includes a protrusion protruding toward the main body, When the inclination angle is the maximum inclination angle and each of the at least one pin is in the non-restricted position, a side surface of the protrusion abuts against the main body portion, and tilting of the main body portion in a direction to increase the inclination angle is restricted. Portable cutting machine.

10. A portable cutting machine according to any one of claims 1 to 3, The predetermined tilt angle includes three or more tilt angles, the at least one hole includes three or more holes arranged at positions corresponding to the three or more inclination angles, the at least one pin includes three or more pins inserted into the three or more holes, respectively; The three or more pins are configured to be switchable between a state in which only one pin arbitrarily selected from the three or more pins is positioned at the restricting position and a state in which all of the three or more pins are positioned at the non-restricting position. Portable cutting machine.

11. A portable cutting machine, With the base, a body having a cutting tool configured to rotate; a front side is defined as a side along which the portable cutting machine advances when the cutting tool cuts the workpiece, and a rear side is defined as an opposite side to the front side; an angular plate is disposed forward or rearward of the main body, and supports the main body so as to be tiltable about a tilt axis extending in the front-rear direction; a fixing mechanism configured to be able to fix the inclination angle of the main body portion with respect to the base at any angle between a minimum inclination angle and a maximum inclination angle; a tilt angle positioning mechanism for positioning the tilt angle at at least two predetermined tilt angles; Equipped with the angular plate has at least two holes penetrating in the front-rear direction at positions corresponding to the at least two predetermined inclination angles, the tilt angle positioning mechanism includes at least two pins inserted into the at least two holes respectively so as to be displaceable in the front-rear direction between a non-restricted position and a restricted position protruding in a direction closer to the main body than the non-restricted position, The at least two pins are configured to be switchable between a state in which only one pin arbitrarily selected from the at least two pins is positioned at the restricting position and a state in which all of the at least two pins are positioned at the non-restricting position, When the at least two pins are in the non-restricted position, the at least two pins do not engage with the body portion; When the inclination angle is one of the at least two predetermined inclination angles and one of the at least two pins is in the regulating position, the one pin engages with the main body portion, and tilting of the main body portion is regulated. Portable cutting machine.

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