JP7569740B2 - Anti-kickback stopper device, accessory set for use with portable cutting machine, and portable cutting system - Google Patents

Description

The present invention relates to a stopper device for preventing kickback, which is used together with a portable cutting machine having a base for contacting the material to be cut, and a long ruler that extends in the longitudinal direction and has a protrusion extending in the longitudinal direction.

When a portable circular saw (hereinafter simply referred to as a circular saw) is used to cut a material, if both sides of the rotating saw blade are clamped by the material due to distortion or bending of the material, the reaction force of the material against the rotating saw blade may cause the circular saw to bounce backward (a phenomenon known as kickback). The following Patent Documents 1 to 3 disclose circular saws that can take measures against kickback by utilizing the ridges of a long ruler used together with the circular saw. Specifically, the circular saw is equipped with a stopper. When kickback occurs and the circular saw moves backward relative to the long ruler, the stopper is displaced and presses the ridges of the long ruler in the short direction of the long ruler. This pressing force restricts the circular saw from moving further backward relative to the long ruler (hereinafter, this state is referred to as the restricted state).

DE 10 2004 002 275 A1 European Patent Application Publication No. 2018920 JP 2011-143526 A

However, in the circular saw of the above patent document, when kickback occurs, the stopper gets caught between the base of the circular saw and the protrusion of the long ruler. This requires a large force to release the restriction imposed by the stopper, making the operation difficult. This problem is not limited to circular saws, but is common to various portable cutting machines (e.g., cutters). This specification provides a stopper device for preventing kickback in a portable cutting machine, which makes it easy to release the restriction.

This specification discloses a stopper device for preventing kickback, for use with a portable cutter and a long ruler. The stopper device is used to restrict the backward movement of the portable cutter when kickback occurs. The portable cutter has a base for contacting the material to be cut. The long ruler extends in the longitudinal direction. The long ruler has a ridge extending in the longitudinal direction.

The stopper device may include a pivot member having a connecting portion for directly or indirectly connecting to the base or the long ruler adapter attached to the base, and a first pressing portion and a second pressing portion. The pivot member may be configured to be pivotable relative to the base in a first pivot direction when the portable cutter moves to a first side in the longitudinal direction relative to the long ruler in a connected state in which the pivot member is connected to the base or the long ruler adapter via the connecting portion. The pivot member may further be configured such that when the pivot member is pivoted to a predetermined pivot position in the pivot direction, the first pressing portion and the second pressing portion approach the protrusion, so that the first pressing portion presses the protrusion toward the side opposite the second pressing portion, and the second pressing portion presses the protrusion toward the side opposite the first pressing portion, and the first pressing portion and the second pressing portion do not press the protrusion when the pivot member is not pivoted to the predetermined pivot position.

The stopper device may include a pivot member having a connecting portion for directly or indirectly connecting to the base or the long ruler adapter attached to the base, and a first pressing portion and a second pressing portion. The pivot member may be configured to be pivotable relative to the base in a first pivot direction when the portable cutting machine moves to a first side in the longitudinal direction relative to the long ruler in a connected state in which the pivot member is connected to the base or the long ruler adapter via the connecting portion, and may be configured to be arranged such that a protrusion is located between the first pressing portion and the second pressing portion in the connected state. The pivot member may further be configured such that when the pivot member is pivoted in the pivot direction to a predetermined pivot position, the first pressing portion and the second pressing portion approach the protrusion, the first pressing portion presses the protrusion toward the second pressing portion side, and the second pressing portion presses the protrusion toward the first pressing portion side, and when the pivot member is not pivoted to the predetermined pivot position, the first pressing portion and the second pressing portion do not press the protrusion.

These stopper devices are arranged so that when kickback occurs, the portable cutter moves to the first side relative to the long ruler. According to any of the above configurations, when the portable cutter is cutting, that is, when the portable cutter is advanced forward (i.e., toward the second side), the pivot member is not pivoted to a predetermined pivot position, so that the first and second pressing parts do not press the protrusions of the long ruler. In other words, the first and second pressing parts do not impede the advancement of the portable cutter. On the other hand, when kickback occurs (i.e., when the portable cutter moves to the first side), the pivot member is pivoted to a predetermined pivot position, so that the first and second pressing parts press the protrusions of the long ruler, and the movement of the stopper device relative to the long ruler is restricted. As a result, the portable cutter connected to the stopper device is prevented from moving further to the first side. Moreover, the first and second pressing parts are pivoted to a predetermined pivot position to press the protrusions independently of the base or the long ruler adapter, so the first and second pressing parts are less likely to get caught in the protrusions. Therefore, the user can easily release the restricted state without needing to use a large amount of force.

1 is a perspective view showing an example of a circular saw used with a stopper device according to an embodiment of the present invention; FIG. 2 is a perspective view showing how the circular saw of FIG. 1 is used together with a long ruler. FIG. 2 is a perspective view showing how the circular saw of FIG. 1 is used together with a long ruler. 4 is a perspective view showing a state in which a stopper device is connected to a base of the circular saw. FIG. 4 is a plan view showing a state in which the stopper device is connected to the base of the circular saw. FIG. FIG. 6 is a partial cross-sectional view taken along line AA in FIG. 5. FIG. 4 is a perspective view showing a pivot member of the stopper device. FIG. FIG. 4 is a perspective view showing a holder of the stopper device. FIG. 2 is a plan view showing the holder; 13 is a partial plan view showing a state in which the circular saw moves forward and the pivot member is pivoted in a second pivot direction. FIG. 11 is a partial plan view showing a state in which the circular saw is moved backward by kickback and the pivot member is pivoted in a first pivot direction. FIG. 13 is a perspective view showing how the holder holds the pivot member in a non-use position. FIG. FIG. 11 is a perspective view of an example of a circular saw according to a second embodiment, with the pivot member in a non-use position; 13 is a plan view showing a state in which a stopper device according to a third embodiment is connected to a base of a circular saw. FIG. 16 is a partial cross-sectional view taken along line BB in FIG. 15. 16 is a partial cross-sectional view taken along line CC of FIG. 15. 13 is a plan view showing a pivot member of a stopper device according to a fourth embodiment, illustrating the positional relationship between the pivot member and a long ruler when the pivot member is connected to a right-handed circular saw. FIG. 19 is a partial cross-sectional view taken along line DD in FIG. 18. 13 is a plan view showing a pivot member of a stopper device according to a fourth embodiment, illustrating the positional relationship between the pivot member and a long ruler when the pivot member is connected to a left-handed circular saw. FIG. 21 is a partial cross-sectional view taken along line EE of FIG. 20. 13 is a plan view showing a pivot member of the stopper device according to the fifth embodiment, corresponding to FIG. 12 .

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. Additionally, the additional features and inventions disclosed below can be used separately or together with other features and inventions to provide further improved stopper devices, methods of manufacturing and methods of using the same.

In addition, 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 described only to illustrate representative examples of the invention. Furthermore, the various features of the representative examples 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 examples described herein or in the order listed to provide additional and useful embodiments of the invention.

All features described in this 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 the configuration of features described in the embodiments and/or claims. Furthermore, all numerical ranges and group or aggregate descriptions are intended to disclose intermediate configurations thereof as limitations to the original disclosure and claimed particulars.

In the following description, when referring to directions related to the stopper device using the long or short direction of the ruler, "long" and "short" refer to the long and short directions, respectively, when the ruler is in use (in other words, when the portable cutter is placed on the ruler). Additionally, the horizontal and vertical directions refer to the horizontal direction when the ruler is in use. In other words, the direction in which the ruler and the portable cutter are lined up when in use is the vertical direction, and the direction perpendicular to the vertical direction is the horizontal direction.

In one or more embodiments, the anti-kickback stop device is intended for use with a portable cutter and a ruler. The portable cutter has a base for contacting the material to be cut. The ruler extends in a longitudinal direction. The ruler has a ridge extending in a longitudinal direction.

In one or more embodiments, the stopper device may include a pivot member having a connecting portion for directly or indirectly connecting to the base or the long ruler adapter attached to the base, and a first pressing portion and a second pressing portion. The pivot member may be configured to be pivotable relative to the base in a first pivot direction when the portable cutter moves to a first side in the longitudinal direction relative to the long ruler in a connected state in which the pivot member is connected to the base or the long ruler adapter via the connecting portion. The pivot member may further be configured such that when the pivot member is pivoted to a predetermined pivot position in the pivot direction, the first pressing portion presses the protrusion toward the side opposite the second pressing portion, and the second pressing portion presses the protrusion toward the side opposite the first pressing portion, and when the pivot member is not pivoted to the predetermined pivot position, the first pressing portion and the second pressing portion do not press the protrusion.

In one or more embodiments, the stopper device may include a pivot member having a connecting portion for directly or indirectly connecting to the base or the long ruler adapter attached to the base, and a first pressing portion and a second pressing portion. The pivot member may be configured to be pivotable relative to the base in a first pivot direction when the portable cutting machine moves to a first side in the longitudinal direction relative to the long ruler in a connected state in which the pivot member is connected to the base or the long ruler adapter via the connecting portion, and may be configured to be arranged such that a protrusion is located between the first pressing portion and the second pressing portion in the connected state. The pivot member may further be configured such that when the pivot member is pivoted in the pivot direction to a predetermined pivot position, the first pressing portion presses the ridge toward the second pressing portion, and the second pressing portion presses the ridge toward the first pressing portion, and when the pivot member is not pivoted to the predetermined pivot position, the first pressing portion and the second pressing portion do not press the ridge.

These stopper devices are arranged so that when kickback occurs, the portable cutter moves to the first side relative to the long ruler. According to any of the above configurations, when the portable cutter is cutting, that is, when the portable cutter is advanced forward (i.e., toward the second side), the pivot member is not pivoted to a predetermined pivot position, so that the first and second pressing parts do not press the protrusions of the long ruler. In other words, the first and second pressing parts do not impede the advancement of the portable cutter. On the other hand, when kickback occurs (i.e., when the portable cutter moves to the first side), the pivot member is pivoted to a predetermined pivot position, so that the first and second pressing parts press the protrusions of the long ruler, and the movement of the stopper device relative to the long ruler is restricted. As a result, the portable cutter connected to the stopper device is prevented from moving further to the first side. Moreover, the first and second pressing parts are pivoted to a predetermined pivot position to press the protrusion independent of the base or the long ruler adapter, so the first and second pressing parts are unlikely to get caught in the protrusion. Therefore, the user can easily release the restricted state without needing to use a large force. The protrusion may be a single protrusion or two protrusions parallel to each other.

In one or more embodiments, the pivot member may be configured to be pivotable in the horizontal direction. The first pivot direction may be a direction in which the relative positions of the first and second pressing parts with respect to the base move to a second side opposite to the first side when the portable cutting machine moves to a first side in the longitudinal direction relative to the long ruler in a connected state. When kickback occurs, the long ruler and the base move relatively in the horizontal direction (more precisely, in the longitudinal direction), so this configuration does not require an additional mechanism for converting the direction of the relative movement between the long ruler and the base into the pivot direction of the pivot member. Therefore, the pivot member can be pivoted with a simple structure.

In one or more embodiments, the pivot member may have a body that extends in a direction intersecting the longitudinal direction in the connected state. Each of the first pressing portion and the second pressing portion may protrude vertically from the body in the connected state. This configuration allows the pivot member to have a simple shape.

In one or more embodiments, each of the first pressing portion and the second pressing portion may protrude from the main body in a direction toward the long ruler in the connected state. Since the protrusion protrudes upward, if the first pressing portion and the second pressing portion protrude downward as in this configuration, when the pivot member is pivoted to a predetermined pivot position, the first pressing portion and the second pressing portion engage with the protrusion, and a configuration in which the first pressing portion and the second pressing portion press the protrusion can be realized with a simple structure.

In one or more embodiments, the pivot member may be configured such that, in the connected state, the first pressing portion is located on the outer side of the long ruler than the second pressing portion in the short direction of the long ruler, and is located on the first side than the second pressing portion in the long direction. With this configuration, as the pivot member pivots toward the predetermined pivot position, the distance between the first pressing portion and the second pressing portion in the short direction increases. For this reason, for example, if the protrusion has a groove that opens upward and extends in the long direction, by arranging the first pressing portion and the second pressing portion in this groove, when the pivot member is pivoted to the predetermined pivot position, the first pressing portion and the second pressing portion can press both inner surfaces of the protrusion that forms the groove toward the outside, respectively. Alternatively, if the long ruler has two ridges extending parallel to each other, the first and second pressing parts can be disposed between the two ridges, and when the pivot member is pivoted to a predetermined pivot position, the first and second pressing parts can press the two ridges outward, respectively.

In one or more embodiments, the pivot member may be configured such that, in the connected state, the first pressing portion is located on the outer side of the long ruler than the second pressing portion in the short direction of the long ruler, and is located on the second side than the second pressing portion in the long direction. With this configuration, as the pivot member pivots toward the predetermined pivot position, the separation distance between the first pressing portion and the second pressing portion in the short direction becomes shorter. Therefore, if the first pressing portion and the second pressing portion are arranged to sandwich the ridge therebetween, when the pivot member is pivoted to the predetermined pivot position, the first pressing portion and the second pressing portion can press the ridge so as to sandwich it from the outside to the inside.

In one or more embodiments, the base or long ruler adapter may have an edge having a through hole extending in the short direction of the long ruler. The pivot member may have a shape and size such that it can be arranged to pass through the through hole in the connected state. The pivot member may further have a shape and size such that a clearance is formed between the base or long ruler adapter and the pivot member such that the pivot member does not abut against the base or long ruler adapter when the pivot member is pivoted to a predetermined pivot position in the connected state. With this configuration, the pivoting of the pivot member to the predetermined pivot position is not hindered due to the abutment of the pivot member with the base or long ruler adapter. Therefore, the first pressing portion and the second pressing portion can press the protrusion more reliably.

In one or more embodiments, the pivot member may be configured to be pivotable in a second pivot direction opposite to the first pivot direction relative to the base so that when the portable cutting machine moves to the second side in the longitudinal direction relative to the long ruler in the coupled state, the first pressing portion and the second pressing portion move away from the protrusion. The pivot member may have a shape and size such that when pivoted by a predetermined angle in the second pivot direction, it abuts against the base or the long ruler adapter to restrict further pivoting in the second pivot direction. According to this configuration, during the cutting operation of the portable cutting machine, that is, when the portable cutting machine is advanced forward (i.e., toward the second side), the first pressing portion and the second pressing portion pivot in a direction away from the protrusion, so that the first pressing portion and the second pressing portion do not exert a resistance force (friction force) against the advancement of the portable cutting machine. In addition, the rotation angle of the pivot member in the second pivot direction is limited, so the pivot member does not rotate at a large pivot angle and press against the protrusion.

In one or more embodiments, the pivot member may be configured to pivot about a pivot axis located at the connection portion. This configuration allows the structure for connection and the structure for pivoting to be integrated together, thus simplifying the structure of the stopper device. However, these structures may also be provided separately.

In one or more embodiments, each of the first pressing portion and the second pressing portion may protrude from the main body in both directions, toward the long ruler and away from the long ruler, when connected. With this configuration, the pivot member can be used with its front and back reversed. In other words, it can be used with both right-handed portable cutting machines, which are often used by right-handed people, and left-handed portable cutting machines, which are often used by left-handed people. This improves the versatility of the stopper device.

In one or more embodiments, the pivot member may be configured to be partially mounted on the ridge in the connected state. With this configuration, when the portable cutting machine is moved to the first side or the second side in the longitudinal direction relative to the long ruler, frictional forces acting between the pivot member and the ridge member facilitate the pivoting of the pivot member.

In one or more embodiments, the stopper device may further include a holder having a first holding portion that pivotally holds the pivot member and an attachment portion for attaching the pivot member to a base or a long ruler adapter. The pivot member may be connected to the base or the long ruler adapter via the holder. This configuration allows the pivot member to be easily connected to the base or the long ruler adapter without complicating the structure of the pivot member.

In one or more embodiments, the holder may include a second holding portion that holds the pivot member at a location separate from the first holding portion when the stopper device is not in use. With this configuration, when the stopper device is not in use, the stopper device can be held on the portable cutting machine at a location that does not interfere with the use of the portable cutting machine.

In one or more embodiments, the stopper device may be configured to allow the pivot member to be connected to the base or the long ruler adapter without tools by utilizing a thumb screw on the base or the long ruler adapter. This configuration improves user convenience.

In one or more embodiments, an accessory set for use with a portable cutting machine may be provided. The accessory set may include a stopper device according to any of the embodiments described above and a long ruler.

In one or more embodiments, the ridge may have a groove that opens toward the protruding direction of the ridge and extends in the longitudinal direction. The ridge may be formed along the edge of the long ruler in the longitudinal direction. With this configuration, kickback countermeasures can be implemented using a general-purpose long ruler that has a groove for inserting a clamping device to fix the relative position of the workpiece and the long ruler.

In one or more embodiments, a portable cutting system may be provided. The portable cutting system may include a stopper device or accessory set according to any of the embodiments described above and a portable cutting machine.

The following describes an embodiment of the present invention in more detail with reference to the drawings.

A first embodiment of the present invention will be described below. First, an example of a portable circular saw (hereinafter simply called a circular saw) 10 and a long ruler 60 used with the stopper device 100 according to the first embodiment will be described. The circular saw 10 and the long ruler 60 are well known, so only a brief description will be given here.

For ease of explanation, in the following explanation, the direction in which the circular saw 10 moves when a user holds the circular saw 10 in his/her hand to cut a workpiece (the direction in which cutting proceeds) is defined as the front side of the circular saw 10, and the opposite direction is defined as the rear side of the circular saw 10. In addition, the side located vertically upward is defined as the top side of the circular saw 10, and the opposite side is defined as the bottom side of the circular saw 10. In addition, the direction perpendicular to the front-to-back and up-down directions is defined as the left-to-right direction of the circular saw 10. In the left-to-right direction, the right side when looking at the front from the rear 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.

As shown in FIG. 1, the circular saw 10 includes a base 20 for contacting the upper surface of the workpiece and a main body 30. The base 20 has a substantially rectangular outer shape. The base 20 has a front end surface 20a at the front end, a right end surface 20b at the right end, a left end surface 20c at the left end, and a rear surface 20d near the rear end, forming a rectangle in plan view with the four surfaces. A guide groove 21 extending in the front-rear direction is formed on the bottom surface of the base 20. This groove is configured so that a protrusion 61 of a long ruler 60 described later can be fitted into it. In addition, near the rear end of the base 20, a protrusion 20e that protrudes rearward is provided on the left side of the rear surface 20d of the base 20. The protrusion 20e is formed into a rectangle in plan view by a protrusion side surface 20g formed parallel to the left end surface 20c and a protrusion rear surface 20f formed parallel to the front end surface 20a. A through hole 22 is formed penetrating the protruding portion 20e in the left-right direction. This through hole 22 is provided for inserting the arm portion of a parallel ruler (not shown) that can be optionally used to advance the circular saw 10 linearly. In addition, a thumb screw 23 having a male thread portion (not shown) extending vertically is attached to the base 20. The thumb screw 23 is provided at a position overlapping the through hole 22 when viewed in the left-right direction. When the parallel ruler is inserted into the through hole 22, the arm portion of the parallel ruler extends below the thumb screw 23. In this state, when the thumb screw 23 is tightened, the thumb screw 23 presses the arm portion downward, and the parallel ruler is fixed to the base 20. Although it is hidden in FIG. 1, a configuration equivalent to the through hole 22 and the thumb screw 23 is also provided near the front end of the base 20.

The main body 30 is basically disposed above the base 20. The main body 30 includes an electric motor 31 and a saw blade 32 (see FIG. 3) that is rotated by the electric motor 31. The saw blade 32 is a disk-shaped circular saw blade, and uses a blade called a tipped saw. The amount by which the saw blade 32 protrudes below the base 20 (cutting depth) can be adjusted. When the cutting depth is adjusted to the maximum, approximately half of the saw blade 32 is located below the base 20, and this portion cuts the material to be cut.

The circular saw 10 shown in Figure 1 is a right-handed saw that is often used by right-handed people. In a right-handed circular saw 10, the saw blade 32 is located near the right end surface 20b of the circular saw 10, and the electric motor 31 is located to the left of the saw blade 32. Although not shown, in a left-handed circular saw, the saw blade 32 is located near the left end surface 20c of the circular saw 10, and the electric motor 31 is located to the right of the saw blade 32.

As shown in Figures 2 and 3, the long ruler 60 has a long rectangular shape when viewed from above. The long ruler 60 is optionally used to move the circular saw 10 forward in a straight line. When using the long ruler 60, the circular saw 10 is placed on the long ruler 60 so that the long side of the long ruler 60 coincides with the front-to-back direction and the short side of the long ruler 60 coincides with the left-to-right direction.

The long ruler 60 has two ridges 61, 62. The ridges 61, 62 are spaced apart from each other in the short direction and extend parallel to each other along the longitudinal direction. The ridge 62 is formed along the longitudinal direction on one edge of the long ruler 60 in the short direction. The ridge 61 is formed inward in the short direction from the ridge 62. Hereinafter, for ease of explanation, the ridge 61 is also referred to as the inner ridge 61, and the ridge 62 is also referred to as the outer ridge 62.

The inner ridge 61 has a shape that fits into the guide groove 21 of the base 20 of the circular saw 10. When using the long ruler 60, the circular saw 10 is placed on the long ruler 60 so that the inner ridge 61 fits into the guide groove 21. This allows the user to move the circular saw 10 forward in a straight line along the inner ridge 61.

The outer ridge 62 has a groove 63 that opens in the protruding direction (i.e., upward) and extends in the longitudinal direction, and upper ends 64, 65 formed on both sides of the groove 63 in the lateral direction. The upper ends 64, 65 protrude inward so as to approach each other. In other words, the upper opening of the groove 63 is narrowed by the upper ends 64, 65. This outer ridge 62 is formed so that a clamping device (not shown) for fixing the relative position of the material to be cut and the long ruler 60 can be inserted into the groove 63. The outer ridge 62 can also be used when clamping with a clamping device when connecting multiple long rulers 60 in the longitudinal direction. The inner ridge 61 also has a structure similar to that of the groove 63 on its lower side. Therefore, the user can use the inner ridge 61 to fix the relative position of the material to be cut and the long ruler 60 with a clamping device.

When using the circular saw 10 and long ruler 60 described above together, the stopper device 100 can be used to restrict the circular saw 10 from moving backward when kickback occurs in the circular saw 10. The stopper device 100 will be described in detail below.

The stopper device 100 includes a pivot member 110 shown in Figs. 7 and 8 and a holder 120 shown in Figs. 9 and 10. The directions in Figs. 7 to 10 indicate the directions in a state in which the stopper device 100 is attached to the base 20 of the circular saw 10 (in other words, the state in which the pivot member 110 is connected to the base 20; hereinafter, referred to as the connected state). Hereinafter, when referring to a direction related to the stopper device 100, the direction related to the stopper device 100 in the connected state is intended unless otherwise specified. As shown in Figs. 7 and 8, the pivot member 110 includes a main body 111, a connecting portion 112, a first pressing portion 113, and a second pressing portion 114. The main body 111 extends in a direction intersecting (in the example of Figs. 7 and 8, perpendicular to) the front-rear direction (the longitudinal direction of the long ruler 60) in the connected state. In this embodiment, the main body 111 is a metal plate.

The connecting portion 112 is a portion having a structure for connecting to the base 20, and is formed on the right end side of the main body 111. As will be described in detail later, in this embodiment, the connecting portion 112 is indirectly connected to the base 20 via a holder 120. In this embodiment, the connecting portion 112 is in the form of a cylindrical protrusion, and protrudes upward from the main body 111. As will be described in detail later, the pivot member 110 is configured to be pivotable about a pivot axis 115 that extends in the vertical direction, and the pivot axis 115 is located at the center of the connecting portion 112.

The first pressing portion 113 and the second pressing portion 114 are portions for pressing the outer ridge 62 in order to restrict the backward movement of the circular saw 10 when kickback occurs. The first pressing portion 113 and the second pressing portion 114 protrude vertically (more specifically, downward) from the main body 111. In this embodiment, each of the first pressing portion 113 and the second pressing portion 114 is in the form of a metal pin, and is pressed into a through hole formed in the main body 111 until the relatively large diameter head portions 113a and 114a abut against the main body 111. However, the first pressing portion 113 and the second pressing portion 114 may be integrally formed with the main body 111 by sintering or the like.

As shown in Figures 9 and 10, the holder 120 is a generally arch-shaped member that extends elongatedly in the left-right direction. In this embodiment, the holder 120 is made of resin to reduce weight. A mounting hole 122 that penetrates the holder 120 in the up-down direction is formed in approximately the center of the holder 120 in the left-right direction. The mounting hole 122 has a circular shape when viewed from above. The annular upper surface 121 that surrounds the mounting hole 122 at the upper end portion of the holder 120 is formed flat.

A first retaining hole 123 is formed near the left end of the holder 120, and a second retaining hole 124 is formed near the right end. The first retaining hole 123 and the second retaining hole 124 each penetrate the holder 120 in the up-down direction. The first retaining hole 123 and the second retaining hole 124 are provided to retain the pivot member 110 at the left or right end of the holder 120 by selectively inserting the connecting portion 112 of the pivot member 110 into the first retaining hole 123 or the second retaining hole 124. The first retaining hole 123 is formed as an elongated hole whose width in the left-right direction is greater than its width in the front-rear direction. On the other hand, the second retaining hole 124 has a circular shape when viewed from above.

Such a stopper device 100 is attached to the base 20 by using the thumbscrew 23 of the base 20. Specifically, as shown in FIG. 6, the holder 120 is arranged so that the male thread of the thumbscrew 23 passes through the mounting hole 122 of the holder 120. Such an arrangement can be easily achieved by temporarily removing the thumbscrew 23, placing the holder 120 on the base 20, and then reattaching the thumbscrew 23. When the thumbscrew 23 is tightened in this state, the knob portion of the thumbscrew 23 comes into contact with the upper surface 121 of the holder 120 and presses the holder 120 downward. This fixes the holder 120 to the base 20.

In this state where the holder 120 is attached, the connecting portion 112 of the pivot member 110 is housed in the first retaining hole 123 of the holder 120 as shown in FIG. 6 and is held in a non-removable state. In this state, the pivot member 110 can pivot horizontally around the pivot axis 115 located at the center of the connecting portion 112. In this way, the pivot member 110 is indirectly connected to the base 20 via the holder 120. By connecting the pivot member 110 to the base 20 via the holder 120, the pivot member 110 can be easily connected to the base 20 without complicating the structure of the pivot member 110. In this connected state, the main body 111 of the pivot member 110 extends from the inside to the outside (i.e., the left side) of the base 20 through the through hole 22 of the base 20 as shown in FIG. 6. By using the through hole 22 in this way, the shape of the main body 111 can be simplified. However, the main body 111 may be shaped to overcome the left edge of the base 20 with a clearance to allow the pivoting movement of the pivot member 110 as described below.

As shown in Figures 4 to 6, in the connected state, the first pressing portion 113 and the second pressing portion 114 are inserted into the groove 63 of the outer ridge 62 of the long ruler 60. When the pivot member 110 is arranged to extend approximately perpendicular to the longitudinal direction of the long ruler 60 as shown in Figure 5, a slight clearance is formed between the upper end 64 of the outer ridge 62 and the first pressing portion 113, and between the upper end 65 of the outer ridge 62 and the second pressing portion 114, to the extent that the first pressing portion 113 and the second pressing portion 114 can be smoothly inserted and removed from the groove 63. In addition, in the connected state, as shown in Figure 6, the bottom surface of the body 111 of the pivot member 110 rests on the upper ends 64 and 65 of the outer ridge 62.

As shown in Figures 4 to 6, the first pressing portion 113 is located to the left of the second pressing portion 114 (in other words, outside the long ruler 60) in the left-right direction (in other words, the short direction of the long ruler 60). In addition, the first pressing portion 113 is located behind the second pressing portion 114 in the front-rear direction (in other words, the longitudinal direction of the long ruler 60).

In this connected state, when the user moves the circular saw 10 forward relative to the long ruler 60 to perform a cutting operation, as shown by the arrow A1 in FIG. 11, the holder 120 fixed to the base 20 also moves forward integrally. As a result, as shown in FIG. 11, the connecting portion 112 of the pivot member 110 abuts against the front inner surface of the first retaining hole 123 of the holder 120, and the pivot member 110 pivots in the second pivot direction A2 around the connecting portion 112 (i.e., around the pivot axis 115). The second pivot direction A2 is the direction in which the relative positions of the first pressing portion 113 and the second pressing portion 114 with respect to the base 20 move rearward.

When the pivot member 110 pivots in the second pivot direction A2, the first pressing portion 113 moves away from the upper end 64 of the outer ridge 62, and the second pressing portion 114 moves away from the upper end 65 of the outer ridge 62. Therefore, the first pressing portion 113 does not press the upper end 64, and the second pressing portion 114 does not press the upper end 65. Furthermore, since the first pressing portion 113 and the upper end 64 of the outer ridge 62 are reliably separated, and the second pressing portion 114 and the upper end 65 of the outer ridge 62 are reliably separated, the first pressing portion 113 and the second pressing portion 114 do not exert a resistance force (friction force) on the forward movement of the circular saw 10. This allows the circular saw 10 to move smoothly.

Such pivoting of the pivot member 110 in the second pivot direction A2 is permitted up to a predetermined pivot angle, but any further pivoting is restricted by the base 20. Specifically, when the pivot position shown in FIG. 11 is reached, the rear end surface of the body 111 of the pivot member 110 abuts against the inner surface of the base 20 that forms the through hole 22, and any further pivoting in the second pivot direction A2 is restricted. If the pivot member 110 could pivot infinitely in the second pivot direction A2, the first pressing portion 113 would abut against the upper end 65 and the second pressing portion 114 would abut against the upper end 64, and further, the first pressing portion 113 and the second pressing portion 114 would press the upper ends 65 and 64 outward, respectively. However, according to this embodiment, such an event does not occur.

On the other hand, if a kickback occurs while the circular saw 10 is moving forward during cutting, the circular saw 10 receives a reaction force from the material being cut and retreats rearward relative to the long ruler 60, as shown by arrow A3 in FIG. 12. This causes the connecting portion 112 of the pivoting member 110 to come into contact with the rear inner surface of the first retaining hole 123 of the holder 120, as shown in FIG. 12, and the pivoting member 110 then pivots in a first pivoting direction A4 about the connecting portion 112 (i.e., about the pivot axis 115). The first pivoting direction A4 is the direction in which the relative positions of the first pressing portion 113 and the second pressing portion 114 with respect to the base 20 move forward.

When the pivot member 110 pivots in the first pivot direction A4, the first pressing portion 113 moves in a direction approaching the upper end 64 of the outer ridge 62, and the second pressing portion 114 moves in a direction approaching the upper end 65 of the outer ridge 62. When the pivot member 110 is pivoted in the first pivot direction A4 to a predetermined pivot position, the first pressing portion 113 presses the upper end 64 toward the left as shown by arrow A5, and the second pressing portion 114 presses the upper end 65 toward the right as shown by arrow A6. This restricts the base 20 (and thus the circular saw 10), which is connected to the pivot member 110 via the holder 120, from further retreating in the direction shown by arrow A3.

In this embodiment, even if the pivot member 110 is pivoted to a predetermined pivot position where the first pressing portion 113 and the second pressing portion 114 press the upper end 64 and the upper end 65, respectively, a clearance is formed between the main body 111 and the base 20 such that the main body 111 does not abut against the base 20 (more specifically, the inner surface forming the through hole 22). In this embodiment, as shown in FIG. 8, a notch 116 is formed in the front end surface of the main body 111, thereby ensuring such a clearance. With this configuration, the pivoting of the pivot member 110 to the predetermined pivot position is not hindered due to the abutment between the main body 111 and the base 20. Therefore, the first pressing portion 113 and the second pressing portion 114 can more reliably press the upper ends 64, 65.

When not in use, the pivot member 110 used as described above is held on the opposite side to when in use, as shown in FIG. 13. Specifically, the connecting portion 112 of the pivot member 110 is housed in the second retaining hole 124 (see FIG. 9) of the holder 120 and is held in a non-removable state. In other words, the pivot member 110 is held in a state in which it extends to the right from the right end of the holder 120. In this case, the pivot member 110 protrudes to the right from the protruding portion side surface 20g at the right end of the protruding portion 20e of the base 20, but does not protrude from the right end surface 20b, so it does not interfere with the use of the circular saw 10.

According to the above-mentioned stopper device 100, when kickback occurs and the circular saw 10 retreats, the first pressing portion 113 and the second pressing portion 114 are pivoted in the first pivot direction A4 to a predetermined pivot position, thereby pressing the upper ends 64, 65 of the outer protrusion 62 in a state independent of the base 20. Therefore, when the stopper device 100 restricts further retreat of the circular saw 10, the first pressing portion 113 and the second pressing portion 114 are unlikely to bite into the upper ends 64, 65. Therefore, the user can easily release the restricted state without requiring a large force. For example, if the user lifts the circular saw 10 upward, the first pressing portion 113 and the second pressing portion 114 can easily be removed from the outer protrusion 62. Alternatively, the user can easily release the restricted state by moving the circular saw 10 forward, which causes the pivot member 110 to pivot in the second pivot direction A2 from the predetermined pivot position shown in FIG. 12 to the pivot position shown in FIG. 11.

Furthermore, according to the stopper device 100, the pivoting member 110 is configured to be pivotable in the horizontal direction. When kickback occurs, the long ruler 60 and the base 20 move relative to each other in the horizontal direction (more precisely, in the front-to-back direction). Therefore, according to this configuration, no additional mechanism is required to convert the direction of relative movement between the long ruler 60 and the base 20 into the pivoting direction of the pivoting member 110. Therefore, the pivoting member 110 can be pivoted with a simple structure.

Furthermore, according to the stopper device 100, the pivot member 110 has a configuration in which the main body 111 extends in the left-right direction from the base 20 to the outer ridge 62, and the first pressing portion 113 and the second pressing portion 114 extend in the vertical direction at the ridge 62, so that the pivot member 110 can be made into a simple shape. Moreover, the first pressing portion 113 and the second pressing portion 114 extending downward from the main body 111 are inserted into the groove 63 of the outer ridge 62, which opens upward, so that when the pivot member 110 is pivoted to a predetermined pivot position, the first pressing portion 113 and the second pressing portion 114 engage with and press the outer ridge 62, so that a simple structure can be realized.

Furthermore, according to the stopper device 100, the pivoting member 110 is configured to pivot about a pivot axis 115 located at the connecting portion 112. This allows the structure for connecting the pivoting member 110 to the base 20 and the structure for the pivoting of the pivoting member 110 to be integrated. In other words, the connecting portion 112 can function as an axis portion for pivoting. This allows the structure of the stopper device 100 to be simplified.

Furthermore, according to the stopper device 100, the body 111 of the pivoting member 110 is partially placed on the upper ends 64, 65 of the outer protrusions 62, so that when the circular saw 10 moves forward or backward relative to the long ruler 60, the frictional force acting between the pivoting member 110 and the upper ends 64, 65 makes it easier for the pivoting member 110 to pivot.

Furthermore, the stopper device 100 allows the pivot member 110 to be connected to the base 20 without the use of tools by utilizing the thumb screw 23 that is originally provided on the base 20. This improves user convenience.

Furthermore, according to the stopper device 100, the first retaining hole 123 is formed as a long hole, so that the connecting portion 112 can move left and right in response to the pivoting of the pivoting member 110, but cannot move significantly in the front and rear directions. This allows the pivoting member 110 to be pivoted efficiently.

The second embodiment of the present invention will be described below only in terms of the differences from the first embodiment. As shown in FIG. 14, the circular saw 210 according to the second embodiment has a base 220 instead of the base 20 of the first embodiment. The base 220 does not have a protrusion at the rear, but instead has a rear end face 220d. The four faces of the front end face 20a, right end face 20b, left end face 20c, and rear end face 220d form a rectangle in plan view. When the stopper device 100 is not in use, the pivot member 110 is held inside the area surrounded by the four planes of the base 220. This allows the pivot member 110 to be protected from collisions.

The third embodiment of the present invention will be described below with reference to Figures 15 to 17, focusing only on the differences from the first embodiment. The stopper device 300 according to the third embodiment performs the stopper function by utilizing an inner ridge 61 and an outer ridge 62. Specifically, the stopper device 300 includes a pivot member 310 and a holder 320.

As shown in FIG. 15, the holder 320 has an L-shape when viewed from above, and includes a first portion 325 extending in the left-right direction and a second portion 326 extending in the front-rear direction. The first portion 325 has a configuration similar to that of the holder 120 of the first embodiment, so that the holder 320 can be attached to the base 20 using the thumb screw 23. As shown in FIG. 17, the second portion 326 extends from the inside of the base 20 to the rear side, climbing over the rear edge of the base 20, and has a shape that branches out into upper and lower branches at its end. A retaining hole 323 is formed in this portion that branches out into upper and lower branches. The retaining hole 323 penetrates the second portion 326 in the vertical direction.

As shown in FIG. 16, the pivot member 310 includes a main body 311, a connecting portion 312, a first pressing portion 313, and a second pressing portion 314. The main body 311 is a plate-like member similar to the main body 111 of the first embodiment, and extends in the left-right direction. The connecting portion 312 is in the form of a cylindrical protrusion, and protrudes upward from the main body 311 near the right end of the main body 311. The first pressing portion 313 and the second pressing portion 314 extend vertically from the main body 311 to the left of the connecting portion 312. As shown in FIG. 15, the first pressing portion 313 is located rearward of the second pressing portion 314 in the front-rear direction, as in the first embodiment.

As shown in Figures 15 and 16, the connecting portion 312 of the pivot member 310 is housed in the retaining hole 323 of the holder 320, and the portion of the main body 311 surrounding the connecting portion 312 is sandwiched between the branched portions of the second portion 326 of the holder 320. With this configuration, the pivot member 310 can pivot horizontally around the connecting portion 312, as in the first embodiment.

As shown in Figures 15 and 16, in the connected state, the first pressing portion 313 and the second pressing portion 314 are inserted into the recess formed between the inner ridge 61 and the outer ridge 62.

In such a stopper device 300, when the user moves the circular saw 10 forward relative to the long ruler 60, as shown by the arrow A1 in Fig. 15, the pivot member 310 pivots in the second pivot direction A2 (see Fig. 15) as in the first embodiment. At this time, the first pressing portion 313 and the second pressing portion 314 do not press the inner ridge 61 and the outer ridge 62. On the other hand, when kickback occurs, the circular saw 10 retreats backward relative to the long ruler 60, as shown by the arrow A3 in Fig. 15. This causes the pivot member 310 to pivot in the first pivot direction A4 (see Fig. 15). As a result, the first pressing portion 313 abuts against the outer ridge 62 and presses it to the left as shown by the arrow A5 in Figures 15 and 16, and the second pressing portion 314 abuts against the inner ridge 61 and presses it to the right as shown by the arrow A6 in Figures 15 and 16. Therefore, as in the first embodiment, the base 20 (and thus the circular saw 10) connected to the pivot member 310 via the holder 320 is restricted from further retreating in the direction shown by the arrow A3.

The fourth embodiment of the present invention will be described below with reference to Figures 18 to 21, focusing only on the differences from the third embodiment. The stopper device of the fourth embodiment utilizes an inner ridge 61 to perform the stopper function. Specifically, the stopper device of the fourth embodiment includes a pivot member 410 and the holder 320 of the third embodiment. Note that Figures 18 to 21 omit illustration of the circular saw 10 and the holder 320, and only show the positional relationship between the pivot member 410 and the long ruler 60.

18 and 19, the pivot member 410 includes a main body 411, a connecting portion 412, a first pressing portion 413, and a second pressing portion 414. The main body 411 and the connecting portion 412 have the same shape as the main body 311 and the connecting portion 312 of the third embodiment. The pivot member 410 differs from the third embodiment in the arrangement of the first pressing portion 413 and the second pressing portion 414. Specifically, as shown in FIG. 18, the first pressing portion 413 on the outer side (left side) is located forward of the second pressing portion 414 in the front-rear direction. In other words, in the connected state, the relative positional relationship in the front-rear direction between the first pressing portion 413 and the second pressing portion 414 is reversed from that in the third embodiment. The first pressing portion 413 and the second pressing portion 414 extend up and down from the main body 411, as in the third embodiment. As shown in Figures 18 and 19, in the connected state, the pivot member 410 is positioned so that the inner protrusion 61 is located between the first pressing portion 413 and the second pressing portion 414.

In this embodiment, when kickback occurs, the circular saw 10 retreats backward relative to the long ruler 60, as shown by the arrow A3 in FIG. 18. This causes the pivoting member 410 to pivot in the first pivoting direction A4 (see FIG. 18). As a result, the first pressing portion 413 abuts against the left side surface of the inner ridge 61 and presses it to the right, as shown by the arrow A5 in FIG. 18 and FIG. 19, and the second pressing portion 414 abuts against the right side surface of the inner ridge 61 and presses it to the left, as shown by the arrow A6 in FIG. 18 and FIG. 19. Therefore, as in the third embodiment, the base 20 (and thus the circular saw 10) connected to the pivoting member 410 via the holder 320 is restricted from further retreating in the direction shown by the arrow A3. In other words, in the fourth embodiment, the first pressing portion 413 and the second pressing portion 414 clamp the inner ridge 61 from both the left and right sides, restricting further backward movement of the circular saw 10.

The pivot member 410 can be used even when it is turned upside down from the state shown in Figures 18 and 19 because the first pressing portion 413 and the second pressing portion 414 extend up and down from the main body 411. Specifically, the above-mentioned embodiments have been described on the assumption that a right-handed circular saw 10 is used, but the pivot member 410 can also be used when a left-handed circular saw 10 is used by turning it over. When a left-handed circular saw 10 is used, the positional relationship between the electric motor 31 and the saw blade 32 in the left-right direction is opposite to that of a right-handed circular saw 10, and the direction of movement of the circular saw 10 when cutting with respect to the long ruler 60 and the direction of kickback are also opposite. However, if the pivot member 410 is used upside down from the state shown in Figures 18 and 19, the relative positions of the first pressing portion 413 and the second pressing portion 414 in the front-to-rear direction are also reversed, and as shown in Figures 20 and 21, the same effect as in Figures 18 and 19 occurs.

In this way, the pivot member 410 can be used with both right-handed and left-handed circular saws 10, improving versatility. The upper and lower branches of the second part 326 of the holder 320 that holds the pivot member 410 have retaining holes 323 in both the upper and lower parts (see FIG. 17). Therefore, regardless of whether the pivot member 410 is used upside down, the connecting part 412 of the pivot member 410 can be accommodated in the retaining hole 323. Although not explained here, the pivot member 310 according to the third embodiment can also be used upside down, similar to the pivot member 410.

The fifth embodiment of the present invention will be described below with reference to FIG. 22, focusing only on the differences from the first embodiment. The stopper device according to the fifth embodiment has a pivot member 510 instead of the pivot member 110 of the first embodiment. The pivot member 510 has a pressing portion 516 formed as a single protrusion instead of the first pressing portion 113 and the second pressing portion 114 formed as two protrusions. Even with this configuration, the left end 516a of this pressing portion 516 exerts a function similar to that of the first pressing portion 113, and the right end 516b of this pressing portion 516 exerts a function similar to that of the second pressing portion 114. In other words, the first pressing portion and the second pressing portion are not limited to two components spaced apart from each other, and may be two parts of a single component.

Although the 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 its spirit, and the present invention includes equivalents. Furthermore, any combination or omission of each element described in the claims and specification is possible within the scope of solving at least part of the above-mentioned problems or achieving at least part of the effects.

For example, the pivot member 410 may be configured such that the first pressing portion 413 and the second pressing portion 414 clamp the outer protrusion 62 from both the left and right sides when kickback occurs.

Furthermore, if the base 20 does not have a guide groove 21, a long ruler adapter having a configuration equivalent to the guide groove 21 may be attached to the base 20. In this case, the pivot member may be connected to the long ruler adapter instead of the base.

Furthermore, the connecting portion of the pivot member may be in the form of a retaining hole into which a protrusion of the holder can be inserted. Furthermore, the pivot member may be directly connected to the base without going through a holder. For example, the connecting portion of the pivot member may be in the form of a through hole into which the male threaded portion of the thumbscrew 23 can be inserted.

Furthermore, the pivot member does not have to pivot in the second pivot direction A2 when the circular saw 10 is moved forward for cutting. Such a configuration can be achieved by adjusting the clearance between the pivot member and the base 20.

Furthermore, the first pressing portion and the second pressing portion are not limited to the form of a protrusion extending from the plate-shaped body of the pivot member. For example, the first pressing portion and the second pressing portion may be formed by curving a plate-shaped member.

Furthermore, the pivoting member may be configured to pivot in a direction other than the horizontal direction. For example, the pivoting member may be configured to be pivotable about a pivot axis extending in the left-right direction. In this case, a conversion mechanism may be provided that converts the relative movement in the front-to-rear direction between the base and the long ruler into the pivoting direction of the pivoting member. In addition, the first and second pressing portions extending in the left-right direction may be inserted into the groove 63 of the outer protrusion 62, and when kickback occurs, the first and second pressing portions may press the bottom surface of the groove 63 and the upper end 64 or the upper end 65, respectively.

Furthermore, the various forms described above are not limited to circular saws, but may be any portable processing machine (e.g., cutters) used in conjunction with a long ruler.

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, 220 is an example of a "base". The long ruler 60 is an example of a "long ruler". The inner ridge 61 and the outer ridge 62 are an example of a "ridge". The pivoting members 110, 310, 410, 510 are an example of a "pivoting member". The connecting portions 112, 312, 412 are an example of a "connecting portion". The first pressing portions 113, 313, 413 are an example of a "first pressing portion". The second pressing portions 114, 314, 414 are an example of a "second pressing portion". The rear side is an example of a "first side". The front side is an example of a "second side". The first pivoting direction A4 is an example of a "first pivoting direction". The second pivoting direction A2 is an example of a "second pivoting direction". The through hole 22 is an example of a "through hole". The pivot axis 115 is an example of a "pivot axis". The first retaining holes 123, 323 are an example of a "first retaining portion". The second retaining hole 124 is an example of a "second retaining portion". The holders 120, 320 are an example of a "holder". The mounting hole 122 is an example of an "mounting portion". The thumb screw 23 is an example of a "thumb screw". The groove 63 is an example of a "groove".

Reference Signs List 10,210: Portable circular saw 20,220: Base 20a: Front end surface 20b: Right end surface 20c: Left end surface 20d: Rear surface 20e: Protruding portion 20f: Rear surface of protruding portion 20g: Side surface of protruding portion 220d: Rear end surface 21: Guide groove 22: Through hole 23: Thumb screw 30: Main body 31: Electric motor 32: Saw blade 60: Long ruler 61,62: Protrusion 63: Groove 64,65: Upper end 100,300: Stopper device 110,310,410,510: Pivot member 111,311,411: Main body 112,312,412: Connection portion 113,313,413: First pressing portion 113a, 114a...Head portion 114, 314, 414...Second pressing portion 115...Pivot axis 116...Notch 120, 320...Holder 121...Top surface 122...Mounting hole 123...First retaining hole 124...Second retaining hole 323...Retaining hole 325...First portion 326...Second portion 516...Pressing portion 516a...Left end 516b...Right end A2...Second pivot direction A4...First pivot direction

Claims (18)

A kickback prevention stopper device for use with a portable cutting machine having a base for contacting a workpiece, and a long ruler extending in a longitudinal direction and having a protrusion extending in the longitudinal direction, comprising:
The protrusion includes a groove or recess extending in the longitudinal direction, and a first protrusion and a second protrusion formed on both sides thereof,
A pivot member having a connecting portion for directly or indirectly connecting to the base or a long ruler adapter attached to the base, and a first pressing portion and a second pressing portion,
The pivot member is
When the portable cutting machine moves toward a first side in the longitudinal direction relative to the long ruler in a connected state in which the pivot member is connected to the base or the long ruler adapter via the connecting portion, the portable cutting machine is configured to be pivotable relative to the base in a first pivot direction,
In the connected state, the first pressing portion and the second pressing portion are configured to be positioned within the groove or the recess;
The pivot member further comprises:
when the pivot member is pivoted in the first pivot direction to a predetermined pivot position, the first pressing portion and the second pressing portion approach the first convex portion and the second convex portion of the protrusion , respectively , so that the first pressing portion presses the first convex portion of the protrusion toward the side opposite to the second pressing portion, and the second pressing portion presses the second convex portion of the protrusion toward the side opposite to the first pressing portion,
A stopper device configured such that, when the pivot member is not pivoted to the predetermined pivot position, the first pressing portion and the second pressing portion do not press the first convex portion and the second convex portion of the ridge. A kickback prevention stopper device for use with a portable cutting machine having a base for contacting a workpiece, and a long ruler extending in a longitudinal direction and having a protrusion extending in the longitudinal direction, comprising:
A pivot member having a connecting portion for directly or indirectly connecting to the base or a long ruler adapter attached to the base, and a first pressing portion and a second pressing portion,
The pivot member is
When the portable cutting machine moves to a first side in the longitudinal direction relative to the long ruler in a connected state in which the pivot member is connected to the base or the long ruler adapter via the connecting portion, the portable cutting machine is configured to be pivotable relative to the base in a first pivot direction,
In the connected state, the protrusion is disposed between the first pressing portion and the second pressing portion,
The pivot member further comprises:
when the pivot member is pivoted in the first pivot direction to a predetermined pivot position, the first pressing portion and the second pressing portion approach the protrusion, so that the first pressing portion presses the protrusion toward the second pressing portion side and the second pressing portion presses the protrusion toward the first pressing portion side;
A stopper device configured so that the first pressing portion and the second pressing portion do not press the protrusion when the pivot member is not pivoted to the predetermined pivot position. The stopper device according to claim 1 or 2,
The pivot member is configured to be pivotable in a horizontal direction,
The first pivot direction is a direction in which, when the portable cutting machine moves toward a first side in the longitudinal direction relative to the long ruler in the connected state, the relative positions of the first pressing portion and the second pressing portion with respect to the base move toward a second side opposite to the first side. The stopper device according to claim 3,
The pivot member includes a main body extending in a direction intersecting the longitudinal direction in the connected state,
the first pressing portion and the second pressing portion each protrude vertically from the main body in the connected state. The stopper device according to claim 4,
the first pressing portion and the second pressing portion each protrude from the main body in a direction toward the long ruler in the connected state. A stopper device according to any one of claims 3 to 5, which includes claim 1 as a dependent,
The pivot member is configured such that, in the connected state, the first pressing portion is located outside the long ruler relative to the second pressing portion in the short direction of the long ruler, and is located on the first side relative to the second pressing portion in the long direction. A stopper device according to any one of claims 3 to 5, which includes claim 2 as a dependent element,
The pivot member is configured such that, in the connected state, the first pressing portion is located outside the long ruler relative to the second pressing portion in the short direction of the long ruler, and is located on the second side relative to the second pressing portion in the long direction. The stopper device according to any one of claims 3 to 7,
The base or the long ruler adapter has an edge portion having a through hole extending in the short direction of the long ruler,
The pivot member is
In the connected state, the through hole may be disposed to pass therethrough,
A stopper device, wherein the pivot member has a shape and a size such that when the pivot member is pivoted to the predetermined pivot position in the connected state, a clearance of a size such that the pivot member does not abut against the base or the long ruler adapter is formed between the base or the long ruler adapter and the pivot member. The stopper device according to any one of claims 3 to 8,
the pivot member is configured to be pivotable relative to the base in a second pivot direction opposite to the first pivot direction such that, when the portable cutting machine moves toward a second side in the longitudinal direction relative to the long ruler in the connected state, the first pressing portion and the second pressing portion move away from the protrusion;
A stopper device having a shape and size such that when the pivot member is pivoted a predetermined angle in the second pivot direction, it abuts against the base or the long ruler adapter, thereby restricting further pivoting in the second pivot direction. The stopper device according to any one of claims 3 to 9,
The pivot member is configured to pivot about a pivot axis located at the connection portion. The stopper device according to any one of claims 4 to 10,
a stopper device in which the first pressing portion and the second pressing portion each protrude from the main body in both a direction toward the long ruler and a direction away from the long ruler in the connected state. The stopper device according to any one of claims 1 to 11,
The stopper device is configured so that the pivot member is partially placed on the protrusion in the connected state. The stopper device according to any one of claims 1 to 12,
The holder further includes a first holding portion that pivotally holds the pivot member, and an attachment portion for attachment to the base or the long ruler adapter,
A stopper device, wherein the pivot member is connected to the base or the long ruler adapter via the holder. The stopper device according to claim 13,
The holder includes a second holding portion that holds the pivot member at a location different from the first holding portion when the stopper device is not in use. The stopper device according to any one of claims 1 to 14,
The stopper device is configured so that the pivot member can be connected to the base or the long ruler adapter without using tools, by utilizing a thumb screw provided on the base or the long ruler adapter. 1. An accessory set for use with a portable cutting machine, comprising:
A stopper device according to any one of claims 1 to 15,
An accessory set comprising the long ruler. 17. An accessory set according to claim 16,
The protrusions are
a groove that opens toward the protruding direction of the protrusion and extends in the longitudinal direction,
An accessory set formed on an edge of the long ruler along the longitudinal direction. 1. A portable cutting system comprising:
A stopper device according to any one of claims 1 to 15 or an accessory set according to claim 16 or claim 17;
A portable cutting system comprising the portable cutting machine.

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