Portable cutting machine

Abstract

To provide a technique which can suppress rattling of a cutting machine during tilting operation, smoothly tilt a cutting machine body relative to a base, and suppress height of angular plate to improve visibility.SOLUTION: A portable cutting machine comprises: a base; a body part; a tilting support member which supports the body to the base so that the body can be tiltable around a first axis line relative to the base; a link arm; a groove part which is arranged at a front-end part of the base; and a stationary part. The link arm is provided with a first end part and a second end part directly or indirectly connected with the body and can rotate relative to the body part in conjunction with tilting of the body around a first axis line of the body part. The stationary part is connected with the second end part of the link arm. The stationary part is switchable between a fixed state where the second end part is fixed to the groove part and a released state where the fixed state is released, and is slidable along the groove part in conjunction with rotation of the link arm in the released state.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] There is known a portable cutting machine that has a substantially rectangular base having an abutment surface for abutting against a workpiece, and a cutting machine body on which a cutting tool is attached, and that can perform cutting with the cutting tool inclined relative to the workpiece (oblique cutting) by tilting the cutting machine body relative to the base. As one type of such portable cutting machine, Patent Document 1 describes a circular saw that includes a bracket connected to the cutting machine body, an angular plate fixed to the base, and a fixed lever. The angular plate is formed in an arc shape, and the shaft of the fixed lever is inserted into an arc-shaped groove in the angular plate and connected to the bracket. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-192782 A [Patent Document 2] JP 2018-176310 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the circular saw described in Patent Document 1, the movement of the bracket relative to the angular plate is restricted by the fixed lever, thereby fixing the inclination angle of the cutting machine body relative to the base. However, there has been a demand for a technology that allows the cutting machine body to be tilted relative to the base and that allows the inclination angle to be fixed, without relying on the structure described in the above Patent Document. [Means for solving the problem]

[0005] According to one aspect of the present disclosure, a portable cutting machine is provided. The portable cutting machine includes a base portion, a main body portion, a tilting support portion, a link arm, a groove portion, and a fixing portion. The base portion has a lower surface for contacting a workpiece. The main body portion is provided on the upper side of the base portion. The base portion includes a cutting machine body including an electric motor configured to provide a rotational driving force to a cutting tool. The tilting support portion is configured to support the main body portion on the base portion so as to be tiltable relative to the base portion around a first axis parallel to the front-rear direction, which is the longitudinal direction of the base portion. The link arm includes a first end portion and a second end portion opposite to the first end portion. The first end portion is directly or indirectly connected to the main body portion. The link arm is configured to rotate relative to the main body portion in conjunction with the tilting of the main body portion around the first axis portion. The groove portion is provided at the front end portion of the base portion. The fixing portion is connected to the second end portion of the link arm. The fixing portion is configured to be switchable between a fixed state in which the second end is fixed to the groove and a released state in which the fixed state is released. In the released state, the fixing portion is configured to slide along the groove in conjunction with the rotation of the link arm.

[0006] According to this aspect, the link arm, which is configured to rotate relative to the main body in conjunction with the tilting of the main body about the first axis, is fixed to the groove by a fixing portion that can slide in the groove, thereby fixing the tilt angle of the main body relative to the base portion. [Brief description of the drawings]

[0007] [Figure 1] This is a perspective view of a circular saw, with the inclination angle of the main body being 0°. [Diagram 2] FIG. [Diagram 3] This is a front view of the circular saw, with the inclination angle of the main body being 0°. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. [Diagram 5]This is a diagram for explaining the structure of the circular saw near the front end of the base, where the inclination angle of the main body is 0°. [Figure 6] This is a perspective view of a circular saw, with the body portion inclined at an angle of 45°. [Figure 7] This is a front view of the circular saw, with the body inclined at an angle of 45°. [Figure 8] FIG. 5 is a cross-sectional view of the circular saw corresponding to FIG. 4, in which the inclination angle of the main body is 45°. [Figure 9] This is a diagram to explain the structure of the circular saw near the front end of the base, where the inclination angle of the main body is 45°. [Figure 10] FIG. [Figure 11] 11 is a cross-sectional view taken along the line XI-XI of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] In a non-limiting embodiment of the present disclosure, the portable cutting machine may include a connecting shaft. The connecting shaft may be configured to connect the main body and the first end of the link arm. A central axis of the connecting shaft may be a second axis parallel to the first axis. The first end of the link arm may be rotatably provided around the connecting shaft. The link arm may be configured to rotate around the second axis in conjunction with the rotation of the main body about the first axis. According to this embodiment, the main body and the link arm are connected by a connecting shaft, and the link arm can rotate around a second axis parallel to the rotation axis (first axis) of the main body. Therefore, compared to a configuration in which the first axis and the second axis intersect, it is possible to suppress interference of the link arm with the main body during tilting of the main body. Therefore, for example, the portable cutting machine can be configured so that the link arm and the main body are closer to each other in the front-rear direction.

[0009] In addition to or instead of the above embodiment, the groove may be provided at the front end of the base portion. The groove may extend along a left-right direction intersecting the front-rear direction. According to this embodiment, since the groove portion extends in the left-right direction, the user's visibility of the front end portion of the base portion can be improved, for example, compared to a configuration in which the groove portion is arc-shaped. Therefore, the workpiece can be easily processed (cut) by the portable cutting machine. For example, when a top guide (ink line guide, marking line guide) is provided on the base portion, the user's visibility of the top guide can be improved.

[0010] In addition to or instead of the above embodiment, when the side of the base portion in the left-right direction on which the cutting tool is attached is defined as a first side and the opposite side is defined as a second side, the groove portion may have a third end portion on the first side in the left-right direction and a fourth end portion on the second side. The portable cutting machine may further include a first stopper. The first stopper may be provided at the fourth end. The first stopper may be configured to abut against the second end portion or the fixed portion of the link arm to restrict rotation of the main body portion in the first direction about the first axis. In this embodiment, the first direction is a direction in which the inclination angle of the main body with respect to the base becomes smaller. According to this embodiment, the rotation of the main body in the first direction can be restricted with a relatively simple configuration. Also, the user can fix the inclination angle of the main body with respect to the base to a relatively small angle by rotating the main body in the first direction until the second end of the link arm or the fixed part abuts against the first stopper, and then fixing the fixed part to the groove.

[0011] In the above embodiment, the first stopper may be configured to determine the inclination angle of the main body portion at an angle at which the blade attached to the main body portion is perpendicular to the base portion. According to this embodiment, the user can rotate the main body in a first direction until the second end or the fixed portion of the link arm abuts the first stopper, and fix the fixed portion to the groove, thereby making a right-angle cut with the cutting tool perpendicular to the workpiece.

[0012] In addition to or instead of the above embodiment, the portable cutting machine may include an angular plate fixed to the base. The angular plate may be configured to extend along the left-right direction at the front end of the base and define the groove. The first stopper may be a screw provided at a position of the angular plate corresponding to the fourth end of the groove. According to this embodiment, since the first stopper is a screw, the user can easily fine-tune the first stopper.

[0013] In addition to or instead of the above embodiment, the angular plate may have a side wall provided on the second side in the left-right direction and a hole penetrating the side wall in the left-right direction. The screw may be disposed in the hole such that a tip of the screw protrudes into the groove. According to this embodiment, the user can adjust the amount of protrusion of the screw from the groove from the second side of the angular plate using a predetermined tool, which makes it easier to adjust the first stopper.

[0014] In addition to or instead of the above embodiment, when the side of the base portion in the left-right direction on which the cutting tool is attached is defined as a first side and the opposite side is defined as a second side, the groove portion may have a third end portion on the first side in the left-right direction and a fourth end portion on the second side. The portable cutting machine may further have a second stopper provided at the third end portion of the groove portion. The second stopper may be configured to abut against the second end portion or the fixed portion of the link arm to restrict rotation of the main body portion in the second direction about the first axis. In this embodiment, the second direction is a direction in which the inclination angle of the main body with respect to the base increases The second direction is a direction opposite to the first direction. According to this embodiment, the rotation of the main body in the second direction can be restricted by a relatively simple configuration using the groove. Also, the user can fix the inclination angle of the main body with respect to the base at a relatively large angle by rotating the main body in the second direction until the second end of the link arm or the fixed part abuts against the second stopper, and then fixing the fixed part to the groove.

[0015] In addition to or instead of the above embodiment, the second stopper may be provided in the groove so that its position in the groove can be displaced (changed) between the third end and the fixed portion. According to this embodiment, the position of the second stopper in the groove can be adjusted to a position corresponding to the tilt angle that is frequently used.

[0016] In addition to or instead of the above embodiment, the portable cutting machine may further include a locking mechanism capable of locking the fixed portion to the groove portion. The locking mechanism may include a recess and a protrusion capable of locking to the recess. The recess may be provided on one of the second end or the fixed portion of the link arm and the groove portion. The protrusion may be provided on the other of the second end or the fixed portion of the link arm and the groove portion. The locking mechanism may be configured so that the recess and the protrusion are locked in response to the fixed portion sliding along the groove portion in conjunction with the rotation of the link arm. According to this embodiment, the main body portion can be locked at a predetermined inclination angle with respect to the base portion.

[0017] In addition to or instead of the above embodiment, the portable cutting machine may include an angular plate fixed to the base portion, and a bevel plate provided on the angular plate and extending in the left-right direction. The angular plate may be configured to extend along the left-right direction at the front end of the base portion and define the groove. One of the recess and the protrusion may be formed on the bevel plate. According to this embodiment, the main body portion can be locked at a predetermined inclination angle with respect to the base portion by utilizing the bevel plate provided on the angular plate.

[0018] In addition to or instead of the above embodiment, the bevel plate may be provided with a scale indicating the inclination angle of the main body portion. According to this embodiment, the main body portion can be locked at a predetermined inclination angle with respect to the base portion by utilizing the bevel plate provided on the angular plate.

[0019] In addition to or instead of the above embodiment, the portable cutting machine may further include a support plate. The support plate may be provided on the second end or the fixed portion of the link arm. The other of the recess and the protrusion may be provided on the support plate. The support plate may be configured to move in the left-right direction on the bevel plate in response to the fixed portion sliding in the left-right direction within the groove. According to this embodiment, a convex portion is provided on one of the bevel plate provided on the angular plate and the support plate provided on the fixed portion, and a concave portion is provided on the other, so that the main body portion can be engaged at a predetermined inclination angle relative to the base portion.

[0020] In addition to or instead of the above embodiment, the device may include a substrate having the lower surface, and an angular plate protruding upward from the substrate at the front end of the base portion. The angular plate may be configured to extend in the left-right direction. An upper wall of the angular plate may extend in the left-right direction along the substrate. The groove may be a through hole that penetrates the angular plate in the front-rear direction and extends in the left-right direction. According to this embodiment, the vertical height of the angular plate can be reduced. Therefore, for example, compared to a configuration in which the groove is arc-shaped, the user's visibility of the front end of the base can be improved. Therefore, the workpiece can be easily processed by the portable cutting machine. For example, when a top guide (ink line guide, marking line guide) is provided on the base, the user's visibility of the top guide can be improved.

[0021] In addition to or instead of the above embodiment, the tilt support part may further include a tilt shaft having the first axis as a central axis. The main body part may include the cutting machine body and a bracket arranged between the cutting machine body and the tilt support part in the front-rear direction. The bracket may be configured to be tiltable around the first axis integrally with the cutting machine body. The bracket may have a first part connected to the cutting machine body, a second part arranged around the tilt shaft, and a bracket arm. The portable cutting machine may include a connecting shaft connecting the bracket arm and the first end of the link arm. When the cutting machine body is tilted around the first axis in a direction (second direction) in which the inclination angle of the cutting machine body with respect to the base part increases, (i) the first end of the link arm may rotate around the connecting shaft in conjunction with the rotation of the bracket around the first axis. (ii) The second end of the link arm may move together with the fixing portion along the groove of the angular plate toward a first side to which the cutting tool is attached in the left-right direction. (iii) At least a portion of the link arm and at least a portion of the bracket arm may overlap in the left-right direction so as to be folded around the connecting shaft. According to this embodiment, when the main body is tilted relative to the base, at least a portion of the link arm and at least a portion of the bracket arm overlap in the left-right direction, thereby improving the user's visibility of the front end of the base.

[0022] In addition to or instead of the above embodiment, the main body may include a gripping portion provided rearward in the front-to-rear direction for a user to grip, and the base may include a top guide provided forward of the groove. According to this embodiment, the vertical height of the angular plate can be reduced, which improves the user's visibility of the top guide compared to, for example, a configuration in which the groove is arc-shaped.

[0023] A portable circular saw according to one non-limiting embodiment of the present disclosure (hereinafter simply referred to as "circular saw 10") will be described below with reference to FIGS. 1 to 11.

[0024] As shown in Figures 1 to 3, the circular saw 10 has a base portion 20 having an abutment surface 212 for abutting against a workpiece W (see Figure 3), and a main body portion 30 including a cutting machine body 31 on which a cutting tool 101 is attached.

[0025] For the sake of convenience, the direction parallel to the cutting (cutting) direction of the circular saw 10 is defined as the front-rear direction of the circular saw 10, the destination to which the workpiece W is transferred relative to the circular saw 10 is defined as the rear side of the circular saw 10, and the opposite side is defined as the front side of the circular saw 10. In this embodiment, the rear side is the side where the user is when holding the circular saw 10 and cutting the workpiece W, and the opposite side is the front side of the circular saw 10. In addition, the side where the workpiece W is placed relative to the base part 20 is defined as the lower side of the circular saw 10, and the opposite side is defined as the upper side of the circular saw 10. The upper side is the side where the main body part 30 is located. Furthermore, the direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction of the circular saw 10. In the left-right direction, the right side when viewed from the rear side to the front side is defined as the right side of the circular saw 10, and the opposite side is defined as the left side of the circular saw 10.

[0026] The main body 30 can be tilted with respect to the base 20 around the tilt axis C1 (see FIG. 3). FIGS. 1 to 5 show the circular saw 10 and a part of the circular saw 10 when the tilt angle of the main body 30 is 0°, and FIGS. 6 to 9 show the circular saw 10 and a part of the circular saw 10 when the tilt angle of the main body 30 is 45°. The tilt angle of the main body 30 is also the tilt angle of the cutting tool 101. The tilt axis C1 extends in the front-rear direction. When the tilt angle is 0°, the side of the cutting tool 101 is perpendicular to the left-right direction. Note that FIGS. 3, 6, and 7 show rotation directions R1 and R2 of the main body 30 around the tilt axis C1. The direction R1 is the direction in which the tilt angle of the cutting tool 101 becomes smaller, and the direction R2 is the direction in which the tilt angle of the cutting tool 101 becomes larger.

[0027] The base part 20 is formed in a substantially rectangular shape. The longitudinal direction of the base part 20 is the front-rear direction, and the lateral direction of the base part 20 is the left-right direction. As shown in FIG. 1, the base part 20 includes a substantially flat plate-shaped base plate 21 having a contact surface 212 (lower surface 212) for contacting the workpiece W. When a long ruler is used together with the circular saw 10 to linearly cut the workpiece W, the base part 20 may be disposed so that the contact surface 212 contacts the long ruler. A notched top guide 221 is provided at the front end of the base plate 21. The top guide 221 is a so-called ink line guide (marking line guide) for aligning with an ink line (marking line) drawn on the upper surface of the workpiece W.

[0028] An opening 213 penetrating in the vertical direction is formed in the left and right edges of the base portion 20. In this embodiment, the opening 213 is provided in the vicinity of the right edge of the substrate 21.

[0029] The main body 30 includes a cutting machine main body 31 and a bracket 40 connected to a front portion of the cutting machine main body 31. The main body 30 is basically disposed on the upper side relative to the base part 20. The cutting machine main body 31 further includes a battery mounting part 39 (see Figs. 1 and 2) for detachably mounting a battery 102. The battery mounting part 39 is provided on the rear side of the motor 33. The battery mounting part 39 includes a pair of guide rails, a hook engaging part, and a terminal, and has a well-known configuration for detachably mounting the battery 102.

[0030] As shown in FIG. 2 and FIG. 3, the cutting machine body 31 includes a motor housing 32 that houses an electric DC motor 33, a gear housing 34, a handle (handle) 36 for a user to hold by hand, and a fixed cover 37. As shown in FIG. 3, the rotation axis AX1 of the motor 33 extends in the left-right direction. A reduction gear and an output shaft having an axis AX2 extending in the left-right direction are housed in the gear housing 34. The motor 33 rotates the cutting tool 101 around the axis AX2 via the reduction gear and the output shaft. In this embodiment, the output shaft extends to the inside of the fixed cover 37. The tip of the output shaft functions as a flange-shaped mounting part 35 (see FIG. 3) configured to detachably mount the cutting tool 101. In this embodiment, a circular saw blade called a chip saw is used as the cutting tool 101. The handle 36 is provided at the rear of the cutting machine body 31. A trigger for starting and stopping the motor 33 is provided on the handle 36.

[0031] 3, the fixed cover 37 is configured to cover approximately the upper half of the cutting tool 101. A movable cover 38 is connected to the fixed cover 37. The movable cover 38 covers the lower half of the cutting tool 101 that protrudes downward from the opening 213. When the circular saw 10 is moved with the front end of the movable cover 38 abutting against, for example, the workpiece W, the movable cover 38 is opened.

[0032] As shown in Figures 4, 5, 8 and 9, the circular saw 10 includes a tilt support portion 25 configured to enable the main body portion 30 to be tilted relative to the base portion 20, and an angle fixing mechanism 18 configured to fix the angle of the main body portion 30 relative to the base portion 20.

[0033] As shown in Fig. 4, the tilting support part 25 includes a tilting shaft 27 and a tilting shaft holding part 26. As shown in Fig. 1, the tilting shaft holding part 26 is provided at the front end part 22 of the base part 20, and protrudes upward from the upper surface 211 of the substrate 21. In this embodiment, the tilting shaft holding part 26 is disposed at the front side (directly in front) of the fixed cover 37. The tilting shaft holding part 26 is formed integrally with the substrate 21. As shown in Fig. 4, the tilting shaft holding part 26 has a hole 261 penetrating in the front-rear direction. The central axis of the tilting shaft holding part 26 is coaxial with the tilting axis C1.

[0034] The tilting shaft 27 extends in the front-rear direction. The central axis of the tilting shaft 27 is coaxial with the tilting axis C1. The front portion of the tilting shaft 27 is disposed in a hole 261 of the tilting shaft holding part 26. The rear end part 271 of the tilting shaft 27 is inserted into a second part 42 of a bracket 40, which will be described later. The tilting shaft holding part 26 holds the cutting machine body 31 via the bracket 40, which will be described later in detail, so that the cutting machine body 31 can be tilted (rotated, rotatable) around the tilting shaft 27 (tilting axis C1).

[0035] The angle fixing mechanism 18 includes an angular plate 23, a bracket 40, a link arm 50, a connecting shaft 60, and a fixing part 70. In the following, the explanation of the direction of each part of the angle fixing mechanism 18 (particularly the left-right direction) is mainly based on the case where the tilt angle of the main body part 30 is 0°.

[0036] As shown in FIG. 1, the angular plate 23 is provided at the front end 22 of the base 20 and protrudes upward from the upper surface 211 of the substrate 21. In this embodiment, the angular plate 23 is formed integrally with the substrate 21. The angular plate 23 is wall-shaped with the left-right direction as the longitudinal direction. It can also be said that the angular plate 23 is formed in a plate shape (approximately columnar shape) with the left-right direction as the longitudinal direction. The angular plate 23 is provided on the left side of the tilt shaft holding part 26 and extends to the left edge of the substrate 21. As shown in FIG. 4, the substantially rectangular upper surface (upper wall 231) of the angular plate 23 extends in the left-right direction along the substrate 21. In this embodiment, the upper surface 231 is substantially perpendicular to the up-down direction. As shown in FIG. 2, a bevel plate 95 having a scale 98 (see FIG. 10) indicating the inclination angle of the main body 30 (the cutting tool 101) is fixed to the upper surface 231 of the angular plate 23.

[0037] The angular plate 23 is provided with a groove 24. The groove 24 penetrates the angular plate 23 in the front-rear direction. The groove 24 extends in the left-right direction. The angular plate 23 also functions as a long groove defining portion. Although details will be described later, the angle fixing mechanism 18 is configured to fix the position of the link arm 50 (second end 52) relative to the groove 24 (angular plate 23), thereby being able to fix the inclination angle of the main body portion 30. The vertical height of the angular plate 23 may be a height that allows the groove 24 to be formed. The height of the groove 24 may be a height that allows the sliding shaft 72, which will be described later, to be inserted therethrough. The upper surface 231 of the angular plate 23 is located below the rotation axis AX1 of the motor 33. For example, the height from the lower surface 212 of the base portion 20 to the upper surface 231 of the angular plate 23 is 10 to 20% of the height from the lower surface 212 of the base portion 20 to the upper end of the fixed cover 37.

[0038] The bracket 40 is configured to connect the cutting machine body 31 and the tilting shaft 27. As shown in Fig. 1, the bracket 40 is located behind the tilting shaft holding part 26 and the angular plate 23 and in front of the cutting machine body 31 in the front-rear direction. As shown in Figs. 4 and 5, the bracket 40 includes a first portion 41 connected to the fixed cover 37, a second portion 42 connected to the tilting shaft 27, and a bracket arm 44.

[0039] The first part 41 is disposed in front of the fixed cover 37. The first part 41 has a through hole extending in the left-right direction. The front end of the fixed cover 37 is fixed around the shaft inserted in the through hole. The second part 42 is disposed below the first part 41 and behind the tilting shaft holding part 26. The second part 42 has a hole (not shown) penetrating in the front-rear direction. The rear end 271 of the tilting shaft 27 is disposed in the second part 42.

[0040] The bracket arm 44 is formed in a plate shape extending from the upper side of the second portion 42 toward the left side. The longitudinal direction of the bracket arm 44 is the left-right direction, and the short side direction (width direction) of the bracket arm 44 is the up-down direction. The bracket arm 44 is located on the upper side near the right end portion of the angular plate 23. A link arm 50 is connected to the left end portion 43 of the bracket arm 44.

[0041] The link arm 50 is configured to connect the bracket 40 and the angular plate 23 (groove 24) via a fixing portion 70. As shown in Fig. 4, the link arm 50 has a first end 51 connected to the left end 43 of the bracket arm 44, and a second end 52 opposite to the first end 51. The first end 51 of the link arm 50 and the left end 43 of the bracket arm 44 are connected by a connecting shaft 60 described later.

[0042] The link arm 50 has a bent portion 53 that bends from the first end 51 toward the front side, and an extending portion 54 that extends from the bent portion 53 toward the left. The bent portion 53 is connected to the first end 51 and is formed in a plate shape that straddles the upper surface 231 of the angular plate 23 and reaches the front side of the angular plate 23. The cross section of the bent portion 53 perpendicular to the left-right direction is substantially L-shaped. The extending portion 54 is connected to the bent portion 53 and is formed in a plate shape that extends in the left-right direction. The longitudinal direction of the extending portion 54 is the left-right direction, and the short side direction (width direction) of the extending portion 54 is the up-down direction. The second end 52 is also the left end of the extending portion 54.

[0043] 3 to 5, the connecting shaft 60 is configured to connect the bracket arm 44 and the link arm 50 rotatably around an axis C2 parallel to the tilt axis C1. In this embodiment, the left end 43 of the bracket arm 44 and the first end 51 of the link arm 50 are each provided with a through hole (not shown) penetrating in the front-rear direction. The shaft body 61 of the connecting shaft 60 is inserted through this hole. The axis C2 is coaxial with the central axis of the shaft body 61.

[0044] The fixing portion 70 is configured to be switchable between a fixed state in which the fixing portion 70 (the second end 52 of the link arm 50) is fixed to the angular plate 23 (the groove 24) and a released state in which the fixed state is released, by a user manually operating the operation lever 71. The fixing portion 70 is normally in the fixed state.

[0045] As shown in Figs. 4 and 5, the fixed part 70 includes a sliding shaft 72 having an axis C3 extending in the front-rear direction as a central axis, and an operating lever 71. The sliding shaft 72 passes through the groove 24 in the front-rear direction. The sliding shaft 72 has an outer diameter sufficient to slide in the groove 24. As shown in Fig. 5, the rear end of the sliding shaft 72 is provided with an abutment part 721 that abuts against the rear surface 234 of the angular plate 23. The front end of the sliding shaft 72 protrudes forward from the groove 24, and a nut 74 is screwed to the front end. On the sliding shaft 72, between the nut 74 and the front surface 235 of the angular plate 23, the operating lever 71, the second end 52 of the link arm 50, and a position plate 91 (described later) are arranged in this order from front to rear. Further, a biasing spring 73 (see FIG. 4) is disposed behind the position plate 91 on the sliding shaft 72 to bias the position plate 91 forward.

[0046] As shown in FIG. 3, the base 711 of the operating lever 71 is provided on the nut 74. In the fixed state, the nut 74 tightens the angular plate 23 in the front-rear direction between the nut 74 and the abutment portion 721. When the operating lever 71 is operated in a direction to loosen the nut 74, the position plate 91 and the second end 52 of the link arm 50 move forward on the sliding shaft 72 by the urging force of the urging spring 73. As a result, the tightening between the nut 74 and the abutment portion 721 is released (released state), and the sliding shaft 72 becomes movable within the groove 24. In the released state, the fixed portion 70 and the second end 52 of the link arm 50 are movable along the groove 24. In the released state, the fixed portion 70 and the second end 52 of the link arm 50 connected to the fixed portion 70 are movable along the groove 24, and the main body 30 (cutting machine main body 31) becomes tiltable around the tilt axis C1.

[0047] For example, when the cutting machine body 31 is tilted to the right by the user from a state in which the cutting machine body 31 is not tilted with respect to the base part 20 as shown in FIG. 1, the bracket 40 rotates in a direction R2 (see FIG. 3) about the tilt axis C1. Specifically, the bracket arm 44 rotates in a direction R2 about the tilt axis C1 with the second part 42 (see FIG. 4) as the center. Since the first end 51 of the link arm 50 is connected to the left end 43 of the bracket arm 44 via the connecting shaft 60, the first end 51 of the link arm 50 is lifted upward by the bracket 40 via the connecting shaft 60 as shown in FIGS. 8 and 9. At this time, the fixing part 70 (sliding shaft 72) moves to the right along the groove 24 while holding the second end 52 of the link arm 50 on the front side of the groove 24. Then, as shown in Figs. 7 and 9, the extension portion 54 of the link arm 50, which extends in the left-right direction in Figs. 1 and 5, tilts so as to be lifted upward with the second end portion 52 as a base point. That is, the link arm 50 rotates in a third direction R3 (see Fig. 7) around the axis C2 of the connecting shaft 60, which is opposite to the tilting (rotating) direction R2 of the bracket 40 and the cutting machine body 31. As is clear from a comparison between Figs. 3 and 7, the link arm 50 moves to the right as a whole (the side approaching the cutting tool 101), and a part of the link arm 50 overlaps with the bracket arm 44 in the left-right direction. In this embodiment, when the circular saw 10 is viewed from the front side, the first end portion 51 and the bent portion 53 of the link arm 50 overlap with the bracket arm 44 in the left-right direction on the front side of the bracket arm 44. In other words, the link arm 50 and the bracket 40 move to the right so as to be folded around the connecting shaft 60.

[0048] After tilting (inclining) the main body portion 30 in the above manner, the user can fix the tilt angle of the main body portion 30 relative to the base portion 20 by fixing the fixing portion 70 to the angular plate 23 (groove 24).

[0049] 4, the circular saw 10 further includes a first stopper 81 that restricts rotation of the main body 30 in direction R1 about the tilt axis C1. The first stopper 81 is provided at the left end 242 of the groove 24. The first stopper 81 restricts leftward movement of the fixed part 70 by abutting against the fixed part 70, thereby restricting rotation of the main body 30 in direction R1 (i.e., the direction in which the tilt angle becomes smaller).

[0050] In this embodiment, the first stopper 81 is formed in a screw shape. A large part of the first stopper 81 is disposed in a hole 233 penetrating the left side wall 232 of the angular plate 23. The first stopper 81 has a shaft portion 812 disposed in the hole 233 and a shaft tip portion 811 protruding into the groove 24. The first stopper 81 is basically provided on the angular plate 23 so that when the sliding shaft 72 abuts against the shaft tip portion 811, the inclination angle of the main body portion 30 (the cutting tool 101) becomes 0°. The first stopper 81 is also called a right-angle stopper.

[0051] 5 and 9, the shaft portion 812 is provided with a hole 813 into which a predetermined tool can be inserted. The amount of protrusion of the shaft tip portion 811 from the groove 24 can be adjusted by rotating the shaft portion 812. The user can adjust the amount of protrusion of the shaft tip portion 811 by inserting the tool into the hole 813 of the shaft portion 812 from the left side of the angular plate 23 and rotating the shaft portion 812. This allows fine adjustment of the restriction angle of the first stopper 81.

[0052] 4, 5, 8 and 9, the circular saw 10 further includes a second stopper 82 that restricts rotation of the main body 30 in direction R2 about the tilt axis C1 (i.e., the direction in which the tilt angle increases). The second stopper 82 is disposed between the right end 241 of the groove 24 and the sliding shaft 72. The second stopper 82 abuts against the fixed part 70 to restrict rightward movement of the fixed part 70, thereby restricting rotation of the main body 30 in direction R2.

[0053] In this embodiment, the second stopper 82 includes a sliding portion 822 slidably provided in the groove 24, and an operation knob 821 connected to the sliding portion 822. The operation knob 821 is disposed on the rear side of the angular plate 23, and is configured to be capable of fixing the position of the sliding portion 822 in the groove 24 by a manual operation by a user. The sliding portion 822 comes into contact with the sliding shaft 72, thereby restricting the movement of the sliding shaft 72 in the rightward direction.

[0054] As shown in Figs. 5 and 9, the second stopper 82 further includes a scale indicator 823 configured to move on the bevel plate 95 as the sliding part 822 slides. As described above, the bevel plate 95 is provided with a scale 98 indicating the inclination angle of the main body part 30. The angle indicated by the scale indicator 823 corresponds to the inclination angle of the main body part 30 when the sliding part 822 and the sliding shaft 72 abut against each other. The user can adjust the maximum inclination angle of the cutting tool 101 to a desired angle by aligning the scale indicator 823 with the desired inclination angle, fixing the second stopper 82 to the groove 24, and rotating the main body part in the direction R2.

[0055] The circular saw 10 of this embodiment further includes a locking mechanism 90 configured to be able to lock the main body 30 at a predetermined inclination angle with respect to the base 20. As shown in Figures 10 and 11, the locking mechanism 90 mainly includes a bevel plate 95 and a position plate 91. The locking mechanism 90 is also called a positive stop mechanism.

[0056] The bevel plate 95 is screwed to the upper surface 231 of the angular plate 23. The bevel plate 95 includes a rectangular plate portion 96 having substantially the same shape as the upper surface 231 of the angular plate 23, a scale 98 provided on the plate portion 96, and a plurality of notches (recesses 97) formed by cutting the front end of the plate portion 96. The plurality of recesses 97 are provided corresponding to relatively frequently used inclination angles such as 0°, 10°, 20°, 30°, and 45°.

[0057] As shown in FIG. 11, the position plate 91 includes an annular portion 92 having a hole 921 penetrating therethrough in the front-rear direction, and a scale indicator portion 93. The sliding shaft 72 of the fixed portion 70 is inserted into the hole 921 of the annular portion 92. The scale indicator portion 93 is a plate-shaped portion (indication plate) connected to the upper end of the annular portion 92 and disposed on the bevel plate 95. The scale indicator portion 93 includes a protrusion 94 protruding downward. The protrusion 94 is configured to be capable of being engaged with a recess 97 of the bevel plate 95. The user can adjust the inclination angle of the main body portion 30 relative to the base portion 20 to a desired angle by fixing the fixed portion 70 to the angular plate 23 at a position where the protrusion 94 of the position plate 91 and the recess 97 of the bevel plate 95 are engaged with each other.

[0058] According to the circular saw 10 of the present embodiment described above, the main body 30 and the link arm 50 are connected by the connecting shaft 60, and the link arm 50 is rotatable around the axis C2 parallel to the tilting axis C1 of the main body 30. Therefore, compared to a configuration in which the tilting axis C1 and the axis C2 intersect, it is possible to prevent the link arm 50 from interfering with the main body 30 during the tilting operation of the main body 30. Therefore, for example, the circular saw 10 can be configured so that the link arm 50 and the main body 30 are closer to each other in the front-rear direction.

[0059] In addition, since the groove 24 extends in the left-right direction, the visibility of the front end portion 22 of the base portion 20 can be improved compared to, for example, a configuration in which the groove 24 is arc-shaped. Therefore, the workpiece W can be easily machined by the circular saw 10. In addition, the visibility of the top guide 221 for the user can be improved.

[0060] In addition, since the groove 24 extends in the left-right direction, it is possible to reduce the vertical height of the angular plate 23 that defines the groove 24. As a result, the visibility of the front end portion 22 of the base portion 20 can be further improved.

[0061] In addition, since the upper wall 231 of the angular plate 23 extends in the left-right direction along the substrate 21 and the groove 24 is formed to penetrate the angular plate 23 in the front-rear direction, the vertical height of the angular plate 23 can be further reduced. Therefore, the user's visibility of the front end 22 of the base portion 20 can be further improved.

[0062] Furthermore, when the cutting machine body 31 is rotated (tilted) in the direction R2 around the tilting axis C1, the link arm 50 and the bracket 40 move to the right as if they are folded around the connecting shaft 60. This further improves the user's visibility of the front end 22 of the base part 20.

[0063] <Correspondence> The correspondence between each component of the above embodiment and each component of the technology of the present disclosure is shown below. However, each component of the embodiment is merely an example and does not limit each component of the technology of the present disclosure. The Circular Saw 10 is an example of a "portable cutting machine." The workpiece W is an example of a "workpiece." The base portion 20 is an example of a "base portion." The cutting tool 101 is an example of a "cutting tool." The motor 33 is an example of an "electric motor." The cutting machine body 31 is an example of a "cutting machine body." The main body 30 is an example of a "main body." The substrate 21 is an example of a "substrate." The lower surface 212 is an example of a "lower surface." The tilt axis C1 is an example of a "first axis." The tilt support portion 25 is an example of a "tilt support portion." The tilt shaft 27 is an example of a "tilt shaft." The link arm 50 is an example of a "link arm." The first end 51 and the second end 52 are examples of the "first end" and the "second end" of the link arm, respectively. The front end 22 is an example of the "front end" of the base portion. The groove 24 is an example of a "groove portion." The fixed portion 70 is an example of a "fixed portion." The axis C2 is an example of a "second axis." The connecting shaft 60 is an example of a "connecting shaft." The right side and the left side are examples of the "first side" and the "second side", respectively. The right end 241 is an example of a "third end of the groove." The left end 242 is an example of a "fourth end of the groove." The first direction R1 is an example of the "first direction." The first stopper 81 is an example of a "first stopper" or a "screw." The angular plate 23 is an example of an "angular plate." The left side wall 232 is an example of an "angular plate 'side wall'". The hole 233 is an example of a "hole penetrating the side wall in the left-right direction." Shaft tip portion 811 is an example of the "tip portion of the screw." The second stopper 82 is an example of a "second stopper." The second direction R2 is an example of the "second direction." The locking mechanism 90 is an example of a "locking mechanism." The recess 97 and the protrusion 94 are examples of a "recess" and a "protrusion", respectively. Bevel plate 95 is an example of a "bevel plate." Scale 98 is an example of a "scale." The scale indicator 93 is an example of an "indication plate." The upper wall 231 is an example of an "upper wall of an angular plate." The bracket 40 is an example of a "bracket." The first portion 41, the second portion 42, and the bracket arm 44 are examples of the "first portion," the "second portion," and the "bracket arm," respectively.

[0064] <Other embodiments> In the above embodiment, the link arm 50 may be directly connected to the cutting machine body 31. For example, the first end 51 of the link arm 50 may be connected to a shaft separately provided on the fixed cover 37, and the link arm 50 may be configured to rotate around the shaft in response to the tilting of the fixed cover 37.

[0065] In the above embodiment, the groove 24 provided in the angular plate 23 does not have to be parallel to the left-right direction. The groove 24 may be substantially arc-shaped along the left-right direction. In addition, the groove 24 may have any shape that allows the fixing portion 70 to be fixed, and may have an open lower edge, for example. This configuration also allows the inclination angle of the main body portion 30 relative to the base portion 20 to be fixed.

[0066] In the above embodiment, the angular plate 23 defining the groove 24 may be configured integrally with the substrate 21 of the base portion 20, or may be configured as a separate body from the substrate 21 and fixed to the substrate 21.

[0067] In the above embodiment, the recess 97 provided on the bevel plate 95 and the protrusion 94 provided on the position plate 91 may be interchanged. For example, the protrusion 94 may be provided on the upper surface of the bevel plate 95, and the recess 97 may be provided on the lower surface of the scale indicating portion 93 of the position plate 91. Even with this configuration, the main body 30 can be locked at a desired angle with respect to the base 20, as in the above embodiment.

[0068] In the above embodiment, the second end 52 of the link arm 50 may be configured to protrude into the groove 24 and slide within the groove 24. In this case, the first stopper 81 and the second stopper 82 may be configured to abut against the second end 52 of the link arm 50 to restrict the movement of the link arm 50.

[0069] In the above embodiment, the first stopper 81 may be disposed relative to the angular plate 23 such that the shaft tip portion 811 protrudes into the groove 24 from the lower surface 212 of the substrate 21 or the upper surface 231 of the angular plate 23 .

[0070] The circular saw 10 may be provided with a power cord that can be connected to an external AC power source, and may be powered by the external AC power source.

[0071] In the above embodiment, the tilt axis C1 of the tilt support part 25 is the central axis of the tilt shaft 27, but the tilt axis C1 of the tilt support part 25 may be a virtual axis. For example, the tilt support part 25 may be configured to include an arc-shaped concave rail and a convex rail arranged opposite each other in the front-rear direction, and to support the main body part 30 tiltably relative to the base part 20 by engaging these rails. In this case, the tilt axis (first axis) may be a virtual axis that extends parallel to the longitudinal direction of the base part 20 and passes through the center of the arc.

[0072] The above configuration is applicable to other portable cutting machines, not limited to the circular saw 10. Examples of other portable cutting machines include plunge-type circular saws and cutters.

[0073] The present disclosure is not limited to the above-mentioned embodiment, and can be realized in various configurations without departing from the spirit of the present disclosure. For example, the technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention column can be appropriately replaced or combined to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if the technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0074] 10: circular saw, 18: angle fixing mechanism, 20: base portion, 21: base plate, 22: front end portion, 23: angular plate, 24: groove, 25: tilt support portion, 26: tilt shaft holding portion, 27: tilt shaft, 30: main body portion, 31: cutting machine main body, 32: motor housing, 33: motor, 34: gear housing, 35: mounting portion, 36: handle, 37: fixed cover, 38: movable cover, 39: battery mounting portion, 40: bracket, 41: first portion, 42: second portion, 43: left end portion, 44: bracket arm, 50: link arm, 51: first end portion, 52: second end portion, 53: bent portion, 54: extension portion, 60: connecting shaft, 61: shaft body, 70: fixed portion, 71: operating lever, 72: sliding shaft, 73: biasing spring, 74: nut, 81: first stopper, 82: Second stopper, 90: locking mechanism, 91: position plate, 92: annular portion, 93: scale indication portion, 94: convex portion, 95: bevel plate, 96: plate portion, 97: concave portion, 98: scale, 101: cutting tool, 102: battery, 211: upper surface, 212: lower surface, 213: opening, 221: top guide, 231: upper surface, 232: left side wall, 233: hole, 234: rear surface, 235: front surface, 241: Right end, 242: left end, 261: hole, 271: rear end, 711: base, 721: abutment, 811: shaft tip, 812: shaft, 813: hole, 821: operation knob, 822: sliding part, 823: scale indicator, 921: hole, AX1: rotation axis, AX2: axis, C1: tilt axis, C2: axis, C3: axis, R1: first direction, R2: second direction, R3: third direction, W: work

Claims

1. A portable cutting machine, a base portion having a lower surface for contacting the workpiece; a main body including a cutting machine body provided on an upper side of the base and having an electric motor configured to provide a rotational driving force to a cutting tool; a tilt support portion that supports the main body portion on the base portion so that the main body portion can tilt relative to the base portion around a first axis that is parallel to a front-rear direction that is a longitudinal direction of the base portion; a link arm including a first end portion directly or indirectly connected to the main body portion and a second end portion opposite to the first end portion, the link arm being configured to rotate relative to the main body portion in conjunction with tilting of the main body portion about the first axis; a groove provided at a front end of the base; a fixing portion connected to the second end of the link arm, the fixing portion being switchable between a fixed state in which the second end is fixed to the groove portion and a released state in which the fixed state is released, and configured to slide along the groove portion in conjunction with rotation of the link arm in the released state; Portable cutting machine.

2. 2. The portable cutting machine of claim 1, a connecting shaft having a second axis parallel to the first axis as a central axis and connecting the main body portion and the first end portion of the link arm; the first end of the link arm is rotatable around the connecting shaft; The link arm is configured to rotate about the second axis in conjunction with the rotation of the main body about the first axis.

3. 2. The portable cutting machine of claim 1, The groove is provided at the front end of the base and extends along a left-right direction that intersects with the front-rear direction.

4. 4. The portable cutting machine according to claim 3, In the left-right direction of the base portion, when the side to which the cutting tool is attached is defined as a first side and the opposite side is defined as a second side, the groove portion includes a third end portion on the first side in the left-right direction and a fourth end portion on the second side, The portable cutting machine further includes a first stopper provided at the fourth end and configured to abut against the second end or the fixed portion of the link arm to restrict rotation of the main body in a first direction around the first axis.

5. 5. The portable cutting machine according to claim 4, an angular plate fixed to the base portion, extending along the left-right direction at the front end of the base portion, and configured to define the groove; The portable cutting machine, wherein the first stopper is a screw provided at a position corresponding to the fourth end of the groove portion in the angular plate.

6. 6. The portable cutting machine according to claim 5, the angular plate has a side wall provided on the second side in the left-right direction and a hole penetrating the side wall in the left-right direction, The screw is disposed in the hole so that a tip of the screw protrudes into the groove.

7. 4. The portable cutting machine according to claim 3, In the left-right direction of the base portion, when the side to which the cutting tool is attached is defined as a first side and the opposite side is defined as a second side, the groove portion includes a third end portion on the first side in the left-right direction and a fourth end portion on the second side, The portable cutting machine further includes a second stopper provided at the third end and configured to abut against the second end or the fixed portion of the link arm to restrict rotation of the main body in a second direction around the first axis.

8. 8. The portable cutting machine of claim 7, The second stopper is provided in the groove so that its position in the groove can be displaced between the third end and the fixed portion.

9. 4. The portable cutting machine according to claim 3, The fixing portion may further include a locking mechanism that can lock the fixing portion to the groove portion, The locking mechanism includes: a recess provided in one of the second end portion or the fixing portion of the link arm and the groove portion; a protrusion provided on the other of the second end portion of the link arm or the fixing portion and the groove portion, the protrusion being capable of being engaged with the recess portion, The locking mechanism is configured so that the recess and the protrusion lock together in response to the fixed portion sliding along the groove in conjunction with the rotation of the link arm.

10. 10. The portable cutting machine of claim 9, an angular plate fixed to the base portion, extending along the left-right direction at the front end of the base portion, and configured to define the groove; a bevel plate provided on the angular plate and extending in the left-right direction, One of the recess and the protrusion is formed on the bevel plate.

11. 11. The portable cutting machine of claim 10, The bevel plate is provided with a scale indicating the inclination angle of the main body portion.

12. 11. The portable cutting machine of claim 10, the other of the recess and the protrusion is an indicator plate provided on the second end or the fixed portion of the link arm, and the indicator plate moves in the left-right direction on the bevel plate as the fixed portion slides in the left-right direction within the groove portion.

13. A portable cutting machine according to any one of claims 3 to 12, The base portion is a base plate having the lower surface; and an angular plate protruding upward from the base plate at the front end of the base portion and extending in the left-right direction, an upper wall of the angular plate extends in the left-right direction along the substrate, The groove portion is a through-hole that penetrates the angular plate in the front-rear direction and extends in the left-right direction.

14. 14. The portable cutting machine of claim 13, The tilt support portion further includes a tilt shaft having a central axis along the first axis line, the main body portion includes the cutting machine main body and a bracket that is disposed between the cutting machine main body and the tilting support portion in the front-rear direction and is tiltable around the first axis line integrally with the cutting machine main body, the bracket has a first portion connected to the cutting machine body, a second portion disposed around the tilting shaft, and a bracket arm; The portable cutting machine further includes a connecting shaft connecting the bracket arm and the first end of the link arm, When the cutting machine body is tilted about the first axis in a direction in which the inclination angle of the cutting machine body with respect to the base portion increases, (i) the first end of the link arm rotates around the connecting shaft in conjunction with the rotation of the bracket around the first axis; (ii) the second end of the link arm moves together with the fixing portion along the groove of the angular plate toward a first side in the left-right direction to which the cutting tool is attached; (iii) A portable cutting machine, wherein at least a portion of the link arm and at least a portion of the bracket arm overlap in the left-right direction so as to be folded around the connecting shaft.

15. 2. The portable cutting machine of claim 1, the main body includes a grip portion that is provided at the rear in the front-rear direction and is to be gripped by a user; The base portion is provided with a top guide located forward of the groove portion.

Images