JP4789594B2 - Portable circular saw - Google Patents

Description

  The present invention relates to a slant cutting technique for performing a machining operation in a state in which a saw blade is slanted with respect to a workpiece in a portable circular saw.

  A portable circular saw equipped with an inclined cutting mechanism is disclosed in, for example, US Pat. No. 6,202,111 (Patent Document 1). Patent Document 1 discloses that a circular saw body rotates about a rotation axis with respect to a base so that an inclination angle with respect to the base is a right angle with respect to the base, which is a so-called 0 degree to a maximum angle (for example, 50 degrees). A configuration that can be adjusted to an arbitrary angle within a range up to (front and back) is disclosed. In addition, when adjusting the inclination angle of the circular saw body, when the circular saw body is rotated about the rotation axis, the inclination angle of the circular saw body is changed to a commonly used inclination angle (for example, A regulating device (stopper device) that regulates the angle to 45 degrees or the like is provided. According to this restricting device, the circular saw body can be quickly adjusted to the normal inclination angle.

In the regulation device described in Patent Document 1, the circular saw body provided on the circular saw body side member and the spring-biased ball engage with the spherical concave portion provided on the base side member. It is the structure which controls to the usual inclination angle. For this reason, depending on the setting of the engagement depth between the ball and the recess or the urging force by the spring, for example, when the circular saw body is vigorously rotated relative to the base, the ball has a predetermined normal inclination angle. There is a possibility that the robot moves over the concave portion, and on the other hand, when the ball is allowed to escape from the concave portion, a considerable external force may be required. That is, the technique of Patent Document 1 has a problem in usability, and there is still room for improvement in this respect.
US Pat. No. 6,202,311

  In view of the above, an object of the present invention is to provide a technique that contributes to improving usability when adjusting the inclination angle of a circular saw body in a portable circular saw.

The portable circular saw according to the first aspect of the present invention includes a base, a circular saw body having a saw blade, a rotating shaft, a fixing device, and a regulating device. The rotation shaft connects the circular saw body to the base so as to be relatively rotatable in a direction intersecting the cutting direction of the saw blade, and allows adjustment of the inclination angle of the circular saw body with respect to the base. . The fixing device makes it possible to fix the circular saw body, which is rotated around the rotation axis by an operation of the user and placed at an arbitrary inclination angle position, to the base by the operation of the user. In the regulating device, the circular saw main body rotated about the rotation axis reaches the normal inclination angle position of the first or second normal inclination angle position set in the rotation operation range. Occasionally, the circular saw body is locked at the normal inclination angle position to restrict free rotation.
The portable circular saw of the present invention is suitably used for an inclined cutting operation for cutting a workpiece at an angle. The “first and second common inclination angles” in the present invention refer to a plurality of inclination angles that are frequently used in the inclination cutting operation of the workpiece. The regulating device automatically moves the circular saw body to any one of a plurality of regular inclination angles when the circular saw body is rotated about the rotation axis to adjust the inclination angle by a user operation. In this way, it is possible to easily adjust the plurality of tilt angle positions of the circular saw main body used frequently.

  In the first aspect of the present invention, the regulating device is provided on either the circular saw body or the base corresponding to each of the first and second common inclination angle positions, and the first and second Are provided on the other side of the first and second step portions and the circular saw body portion or the base that respectively define the normal inclination angle position, and the circular saw body portion is on the side where the inclination angle with respect to the base is increased or decreased. Of the circular saw body by engaging with either the first step or the second step when the first and second common tilt angle positions are turned. And one engaging member that regulates at any one of the normal inclination angle positions defined by the engaged step portions. And the 1st and 2nd step part is set on the cross | intersection surface with the axis line of a rotating shaft so that the depth direction which cross | intersects the level | step difference direction may become the axial direction of a rotating shaft. The engaging member protrudes in the depth direction of the first and second stepped portions, and is movable between the first and second protruding positions having different protrusion amounts. The first protrusion In the state moved to the position, the circular saw body is locked at the first normal inclination angle position by engaging only with the first step portion in the direction intersecting the protruding direction, and moved to the second protruding position. In this state, the circular saw body is locked at the second normal inclination angle position by engaging only with the second step portion in a direction crossing the protruding direction. In the present invention, “the first and second common inclination angle positions set in the rotation operation range” means that there are at least two common inclination angle positions, and in addition, a third common inclination angle position. The aspect which sets a position and also the 4th common inclination-angle position is included suitably. When the normal inclination angle position increases, the number of steps and the movement position of the engaging member increase correspondingly.

The restricting device of the present invention is configured to restrict the circular saw main body portion to the normal inclination angle position by engaging the engaging member with the stepped portion. Therefore, when the circular saw body is rotated to adjust to the first normal inclination angle or the second normal inclination angle, the normal inclination is not exceeded without exceeding the normal inclination angle position to be adjusted. It can be securely locked in the angular position. On the other hand, when the circular saw body is rotated to switch from one normal inclination position to the other normal inclination angle position, it does not receive a resistance force that prevents the circular saw body from rotating. The operation can be performed easily. Thus, according to the present invention, it is possible to provide a portable circular saw that is easy to use when adjusting the inclination angle of the circular saw body.
Further, the regulating device of the present invention is configured to select which of the first and second step portions is brought into contact with by moving the engaging member between the first position and the second position. The setting of the normal inclination angle position of the circular saw body can be performed by a simple operation by simply changing the position of the engaging member, and the workability of the adjustment operation of the inclination angle can be improved. Further, according to the present invention, the engaging direction of the engaging member with respect to the stepped portion and the moving direction for changing the position of the engaging member intersect each other. For this reason, the force at the time of engagement does not move the engagement member in the axial direction, and the position of the engagement member does not change. Therefore, the circular saw main body can be reliably locked at the selected normal inclination angle position.

  According to the regulating device of the present invention, the first and second step portions are on the intersecting surface with the axis of the rotation shaft so that the depth direction intersecting the step direction becomes the axis direction of the rotation shaft. The moving direction for changing the position of the engaging member is the depth direction of the first and second step portions. That is, according to the present invention, since the engaging member is moved in the axial direction of the rotating shaft and the position thereof is changed, the side surface region in the axial direction of the rotating shaft that is likely to become a dead space is formed on the engaging member. It is possible to effectively use it as a moving operation area for changing the position of the position, and space efficiency can be improved.

According to the invention , the regulating device is provided corresponding to each of the first and second protruding positions of the engaging member, and the engaging member is set to one of the first and second protruding positions. It has the 1st and 2nd cam surface hold | maintained at a protrusion position. The engaging member is constituted by a rod-like member that can move in a long axis direction parallel to the axial direction of the rotating shaft and that can turn around the long axis. The first and second cam surfaces are arranged around the major axis of the rod-shaped member and have a level corresponding to the level difference of the first and second step portions in the major axis direction of the rod-shaped member. The rod-shaped member has a protruding portion that is selectively engaged with either the first or second cam surface in the major axis direction of the rod-shaped member, and the protruding portion is the first or second protruding portion. In a state where the cam surface is engaged with any one of the cam surfaces, the engagement of the protruding portion with respect to the first or second cam surface is released by moving the rod-shaped member in the direction opposite to the protruding direction, The projecting portion is engaged with the other cam surface of the first or second cam surface by the rotation operation in the circumferential direction of the rod-shaped member in the released state and the movement operation in the protruding direction after the rotation operation. Thus, the rod-like member is held at the first or second protruding position.

  The “rod-like member” in the present invention is sufficient if it is a long member, and suitably includes both circular and non-circular cross-sectional shapes. According to the present invention, the rod-shaped member can be easily moved from the first position to the second position or the second position by moving the rod-shaped member in the major axis direction and rotating around the major axis. The position can be changed from the position to the first position, and the position can be held at the changed position. In addition, about engagement with a cam surface and a protruding part, it can be set as the fitting by an unevenness | corrugation, for example. With such a configuration, the engaged state can be further stabilized.

(Invention of Claim 2 )
According to the second aspect of the present invention, the portable circular saw according to the first aspect further includes a biasing member that biases the rod-shaped member in the protruding direction, and the protruding portion is biased against the cam surface. The engaging member is engaged while being biased by the biasing member. The “biasing member” typically corresponds to a spring. According to the present invention, in a state where the protruding portion of the rod-shaped member is engaged with the cam surface, the urging force of the urging member acts on the rod-shaped member, so that the stability of the engaged state is maintained.

(Invention of Claim 3 )
According to a third aspect of the present invention, in the portable circular saw according to the first or second aspect , the circular saw body and the base are relative to each other around the axis of the rotation shaft. When it rotates, it has the opposing wall surface which moves relatively without changing an opposing space | interval, and it is set as the structure by which the control apparatus is arrange | positioned between opposing wall surfaces. According to such a configuration, it is possible to protect the regulating device from dust generated during the cutting work of the workpiece, and to maintain the smoothness of the operation of the regulating device.

  According to the present invention, in the portable circular saw, a technique that contributes to improving the usability when adjusting the inclination angle of the circular saw body is provided.

(First embodiment of the present invention)
Hereinafter, a portable circular saw according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the entire configuration of the portable circular saw according to the present embodiment, and FIG. 2 is a front view showing the entire configuration of the portable circular saw. FIGS. 3 to 6 show a stopper device for restricting the circular saw body to a normal inclination angle position by a front view or a sectional view, and FIGS. 7 to 11 show an inclination angle adjustment mode of the circular saw body. Has been. As shown in FIGS. 1 and 2, the portable circular saw 101 according to the present embodiment generally includes a base 111 that can be placed on a workpiece, and a circular saw body portion connected to the base 111. 121. The workpiece is not shown for convenience.

  The circular saw body 121 includes a blade 123, a blade case 125 that covers the upper half of the blade 123, a motor housing 127 that houses a drive motor (not shown) for rotationally driving the blade 123, and a user's A hand grip 129 for gripping and operating the portable circular saw 101 is mainly configured. The blade 123 corresponds to the “saw blade” in the present invention. The lower edge portion of the blade 123 protrudes to the lower surface side of the base 111. The front-rear direction of the circular saw body 101 when the front end portion of the base 111 is placed on the workpiece to be cut and moved forward (in the direction of the arrow in FIG. 1) corresponds to the cutting direction. The hand grip 129 is integrally provided above the motor housing 127 and includes a trigger switch (not shown) for energizing the drive motor.

  Next, a so-called inclined cutting mechanism 131 that performs a cutting operation such as a cutting operation in a state where the blade 123 is inclined with respect to the workpiece will be described with reference mainly to FIGS. The tilt cutting mechanism 131 according to the present embodiment includes a tilt angle adjusting mechanism 133 that adjusts the tilt angle of the circular saw main body 121 with respect to the base 111, and a plurality of regular tilt angle positions where the circular saw main body 121 is frequently used. The main component is a stopper device 181 that regulates the above. The stopper device 181 corresponds to the “regulating device” in the present invention.

The tilt angle adjusting mechanism 133 includes an angular guide 113 provided on the base 111, an angular case 135 provided on the circular saw body 121, and the circular saw body 121 tilted with respect to the base 111 by a user operation. The rotation shaft 137 (refer to FIG. 3 ) that constitutes the rotation center at the time of the rotation and the lock screw 139 that fixes the circular saw body 121 to the adjusted inclined position by the operation of the user are mainly configured. The lock screw 139 corresponds to the “fixing device” in the present invention. The angular guide 113 as a base side member is erected integrally with a front end portion and a rear end portion of the upper surface of the base 111 (see FIG. 1). The angular case 135 as the circular saw body side member is fixedly provided at the front end and the rear end of the circular saw body 121 in a state of facing the angular guide 113 (see FIG. 1). The angular case 135 is rotatably connected to the angular guide 113 via a rotation shaft 137. The axial direction of the rotating shaft 137 is the cutting direction by the blade 123, that is, the front-rear direction of the circular saw body 121. That is, the turning direction of the circular saw body 121 is a direction that intersects the cutting direction of the blade 123.

  The front angular guide 113 is formed with an arcuate guide groove 113 a centering on the rotation shaft 137. The lock screw 139 passes through the guide groove 113 a from the front side of the angular guide 113 and is screwed into an angular case 135 that is disposed so as to overlap the rear side of the angular guide 113. The angular case 135 is fixed to the angular guide 113 by tightening the lock screw 139, and the fixing is released by loosening the tightening. Therefore, in a state in which the lock screw 139 is released, the circular saw body 121 is rotated around the rotation shaft 137 (inclined to the left as viewed from the front of the portable circular saw 101 as indicated by a two-dot chain line in FIG. 2). ), The inclination angle of the circular saw body 121 with respect to the base 111, that is, the inclination angle of the blade 123 can be adjusted arbitrarily. After the adjustment, the inclination angle adjusted by tightening the lock screw 139 is set to an arbitrary inclination angle. Can be fixed. Thereby, it is set as the structure corresponding to the cutting operation | work in the state inclined to the left side seeing from the front of the portable circular saw 101, and what is called inclination cutting (refer FIG. 2). The inclination angle of the circular saw body 121 can be adjusted based on an inclination angle indicator 132 set between the angular guide 113 and the angular case 135.

  The guide groove 113a is configured to function also as a stopper that defines an adjustment range of an inclination angle with respect to the lower surface of the base 111 of the circular saw body 121 (a surface placed on the workpiece). That is, when the lock screw 139 that moves together with the angular case 135 abuts one end (the lower right end in the figure) in the extending direction (arc direction) of the guide groove 113a, the minimum inclination angle (reference numeral (I) in FIG. 3). The maximum inclination angle (the position indicated by reference numeral (II) in FIG. 3, for example, 48 degrees) is the time when it contacts the other end (the upper left end in the figure). The minimum inclination angle is 0 degree at which the blade 123 makes a right angle with respect to the base 111. However, in consideration of the machining accuracy and the gap generated between the assembled members, the circular saw body 121 is allowed to tilt slightly beyond the right angle (0 degree) at the minimum tilt angle (right angle). Thus, the dimension of the guide groove 113a is set and can be adjusted to a normal right angle position by a fine adjustment means (not shown) for convenience.

  The stopper device 181 has a specific inclination angle of the circular saw body 121, that is, a normal inclination angle frequently used. In this embodiment, the inclination angle shown in FIG. 7 (for example, 15 degrees) and the inclination shown in FIG. The angle (for example, 22.5 degrees), the inclination angle (for example, 30 degrees) shown in FIG. 9, and the inclination angle (for example, 45 degrees) shown in FIG. Hereinafter, in the present embodiment, the inclination angle shown in FIG. 7 is the first common inclination angle, the inclination angle shown in FIG. 8 is the second common inclination angle, the inclination angle shown in FIG. 9 is the third common inclination angle, and FIG. The inclination angle shown is referred to as a fourth common inclination angle.

  The stopper device 181 includes four steps, that is, a first step 181a that defines a first common inclination angle of the circular saw body 121, a second step 181b that defines a second common inclination angle, and a third common inclination. Sectional circle as a rod-like member that can be engaged with any one of these stepped portions 181a, 181b, 181c, and 181d, and a third stepped portion 181c that defines the angle and a fourth stepped portion 181d that defines the fourth common inclination angle. The stop pin 183 having a shape and the operation knob 185 of the stop pin 183 are mainly configured. The first to fourth step portions 181a, 181b, 181c, 181d correspond to the “step portion” in the present invention, and the stop pin 183 corresponds to the “engaging member” in the present invention.

  The first to fourth step portions 181a to 181d constituting the engagement surface with the stop pin 183 have predetermined steps with respect to each other, and as shown in FIG. 3 and FIG. On the surface facing the regular guide 113), the depth direction intersecting the step direction is provided so as to be parallel to the axial direction (front-rear direction) of the rotating shaft 137. Of the step portions 181a, 181b, 181c, and 181d, the fourth step portion 181d that defines the fourth common inclination angle (45 degrees) is the most frequently used, and thus is defined by the fourth step portion 181d. In order to enable fine adjustment of the inclination angle of the circular saw body 121, the adjustment is performed by an adjustment screw 181e attached to the nut member 181f. In other words, the adjustment screw 181e is configured such that the axial end surface functions as a fourth step portion, and is rotated clockwise or counterclockwise with respect to the nut member 181f fixed to the angular case 135 to be axially By moving forward and backward, the position of the end face, that is, the position of contact with the stop pin 183 is changed, whereby the inclination angle is finely adjusted.

  The base side member is arranged so that the axial direction of the stop pin 183 is parallel to the first to fourth step portions 181a to 181d and is located on the arrangement line of the first to fourth step portions 181a to 181d. It is arrange | positioned at the angular guide 113 which is. The stop pin 183 is disposed in a stepped guide hole 184 that penetrates the angular guide 113, and is movable in the axial direction and rotatable about the axial direction. That is, the stop pin 183 is configured to change the protruding amount (height) from the rear surface of the angular guide by moving in the axial direction. By changing the protruding amount, the first to fourth step portions 181a, 181b, 181c, 181d, the first to fourth step 181a in the direction (the movement direction of the first to fourth step 181a, 181b, 181c, 181d) intersecting the projecting direction of the tip 183a. , 181b, 181c, 181d are engaged (hereinafter referred to as contact). The stop pin 183 is always biased in the protruding direction by the biasing spring 182. The biasing spring 182 is disposed in the guide hole 184 and is elastically interposed between a retaining ring 183b attached to the stop pin 183 and a step portion of the guide hole 184.

  The other end of the stop pin 183 passes through the guide hole 184 and protrudes to the front side (outer surface) of the angular guide 113, and a cylindrical operation knob 185 for pin operation is loosely fitted to the protrusion. It is taken to. The operation knob 185 is integrated with the stop pin 183 via a stop ring 186 provided on the stop pin 183 and a coil spring 187 that urges the operation knob 185 toward the stop ring 186 side.

  The stopper device 181 includes a stop pin holding mechanism 188 that holds the stop pin 183 at a position where the protruding amount is adjusted. The stop pin holding mechanism 188 mainly includes a cylindrical end cam portion 189 provided on the angular guide 113 side and a protruding portion 185a formed on the handle 185 side. As shown in a development view in FIG. 6, the one end surface in the axial direction of the end cam portion 189 has five steps having a predetermined step (axial height) in the circumferential direction around the axis of the stop pin 183, that is, First to fifth cam surfaces 189a to 189e are formed. The magnitude | size of the level | step difference of each of these 1st-5th cam surfaces 189a-189e respond | corresponds to the magnitude | size of the depth of 1st-4th each step part 181a-181d mentioned above, respectively. In the present embodiment, the five-stage cam surfaces 189a to 189e are set point-symmetrically with a half circumference (180 degrees) as a unit. On the other hand, two protrusions 185a are provided with a phase difference of 180 degrees, and the width of the end surface of each protrusion 185a corresponds to the width of one cam surface. The two protruding portions 185a are configured to engage with two cam surfaces having the same axial height. Therefore, after the operation knob 185 is picked and moved in the direction in which the stop pin 183 is retracted (pulled between hands), the protrusion 185a is moved by appropriately rotating in the circumferential direction and then moving in the protruding direction. Can be selectively engaged with any one of the first to fifth cam surfaces 189a to 189e to adjust the protruding amount of the stop pin 183 and to hold it in the adjustment position. As shown in FIG. 6, the first to fifth cam surfaces 189a to 189e and the projecting portion 185a are engaged with each other by fitting with a convex surface and a concave surface in the axial direction of the stop pin 183. Free relative movement of direction is suppressed.

  The stop pin 183 is placed at the first projecting position when the projecting portion 185a engages with the first cam surface 189a, and the stop pin 183 is brought into the second projecting position when the projecting portion 185a engages with the second cam surface 189b. The projecting portion 185a is placed at the third projecting position by engaging the third cam surface 189c, and the projecting portion 185a is placed at the fourth projecting position by engaging the fourth cam surface 189d. Further, the protruding portion 185a is placed at the fifth protruding position by engaging with the fifth cam surface 189e. The stop pin 183 can be brought into contact only with the first step 181a that defines the first common inclination angle when the stop pin 183 is placed at the first projecting position, and when the stop pin 183 is placed at the second projecting position, It is possible to contact only the second step 181b that defines the second common inclination angle, and only contact to the third step 181c that defines the third common inclination angle when placed at the third protruding position. When placed at the fourth projecting position, only the fourth step portion 181d that defines the fourth common inclination angle can be contacted. It should be noted that when placed at the fifth protruding position, it is configured not to be engaged with any of the step portions 181a to 181d. That is, the fifth protruding position of the stopper pin 183 is set as a restriction release position for releasing the inclination angle restriction of the circular saw body 121. Each protruding position of the stopper pin 183 can be confirmed by aligning the pointer of the operation knob 185 with the scale 113a provided on the angular guide 113, as shown in FIGS.

  The portable circular saw 101 according to the present embodiment is configured as described above. Therefore, the most frequently used right angle cutting is to loosen the lock screw 139 by the user's operation and move the circular saw body 121 around the rotation shaft 137 until the lock screw 139 comes into contact with one end (lower end) of the guide groove 113a. To do. As a result, the angle of inclination of the circular saw body 121 becomes a right angle (0 degree), and at this time, a right angle cut is possible. In this case, if an accurate squareness is required as described above, the fine adjustment means can be used to make an accurate adjustment.

  Next, when the inclination angle is cut using the first common inclination angle, the operation knob 185 is operated according to the procedure described above, and the stop pin 183 is moved to the first cam surface 189a by engaging the projection 185a. 1 Set to the protruding position. In this state, when the lock screw 139 is loosened and the circular saw body 121 is rotated about the rotation axis 137 to the side where the inclination angle is increased, the first step 181a for the first normal inclination angle of the angular case 135 is provided. Comes into contact with the tip 183a of the stop pin 183 (see the upper end of the contact state indicated by the two-dot chain line in FIG. 5 and FIG. 7). As a result, the circular saw body 121 is restricted to the first normal inclination angle position. In this state, the lock screw 139 is tightened to fix the circular saw body 121 to the base 111, and the cutting operation at the first normal inclination angle can be performed.

  Next, when the inclination angle is cut using the second common inclination angle, the operation knob 185 is operated according to the procedure described above, and the stop pin 183 is engaged with the second cam surface 189a by engaging the protrusion 185a. 2 Set to the protruding position. In this state, if the same procedure as in the case of the second regular inclination angle described above is performed, the first step 181a for the first regular inclination angle of the angular case 135 passes through the tip of the stop pin 183, The second step 181b for the second normal inclination angle comes into contact with the tip 183a of the stop pin 183 (see the second from the contact state shown by the two-dot chain line in FIG. 5 and FIG. 8). As a result, the circular saw body 121 is restricted to the second normal inclination angle position.

  The angle adjustment operation when the tilt angle is cut using the third common tilt angle and when the tilt angle is cut using the fourth common tilt angle is the same as the case of the first or second common tilt angle. Therefore, the description of the operation procedure is omitted, but the third common inclination angle is regulated by the third step portion 181c coming into contact with the tip 183a of the stop pin 183 (in FIG. 5, a two-dot chain line). The third reference from the upper end of the contact state shown and FIG. 9). Further, the regulation of the fourth common inclination angle is made by the fourth step portion 181d coming into contact with the tip 183a of the stop pin 183 (see the lower end in the contact state shown by the two-dot chain line in FIG. 5 and FIG. 10). As for the fourth step portion 181d for the fourth common inclination angle that defines the inclination angle of the circular saw body 121 as 45 degrees, as described above, the fourth step portion 181d is configured by the adjusting screw 181e. If necessary, the position of the stop pin 183 in the moving direction can be changed to finely adjust the fourth common inclination angle.

  When the inclination angle is cut using the maximum inclination angle, the protruding position of the stop pin 183 is set to the fifth protruding position. In this state, when the lock screw 139 is loosened and the circular saw body 121 is rotated about the rotation axis 137 to the side where the inclination angle is increased, all of the first to fourth step portions 181a to 181d of the angular case 135 are all formed. Passes through the tip 183a of the stop pin 183 (see the two-dot chain line shown at the lower end of FIG. 5). After the passage, the lock screw 139 comes into contact with the other end of the guide groove 113a, thereby restricting the circular saw body 121 to the maximum inclination angle position (see FIG. 11). In this state, the circular saw main body 121 is fixed to the base 111 with the lock screw 139, and the cutting operation at the maximum inclination angle can be performed.

  As described above, according to the present embodiment, in the portable circular saw 101 that can adjust the tilt angle by rotating the circular saw body 121 between the minimum tilt angle and the maximum tilt angle, The position of 183 is changed to the first protruding position corresponding to the first common inclination angle, the second protruding position corresponding to the second common inclination angle, the third protruding position corresponding to the third common inclination angle, or the fourth common inclination angle. By selectively switching to the corresponding fourth protruding position, the inclination angle of the circular saw body 121 can be easily set to the first to fourth regular inclination angles, and the workability of the adjustment operation of the inclination angle is improved. Valid.

  In the present embodiment, when the circular saw body 121 is rotated, the first to fourth step portions 181a to 181d are brought into contact with the stop pin 183 so that the circular saw body portion 121 is inclined to the first to fourth regular inclinations. It is the structure which controls to an angular position. For this reason, the circular saw main body 121 can be reliably locked at a predetermined regular inclination angle position without exceeding the inclination angle position to be regulated. On the other hand, when the circular saw body 121 is rotated to switch from one normal inclination position to another normal inclination angle position, or when it is returned to the minimum inclination angle position, the circular saw body 121 is prevented from rotating. Since such resistance force is not received, the rotation operation can be easily performed. Thus, according to the present embodiment, it is possible to provide a portable circular saw 101 that is easy to use when adjusting the inclination angle of the circular saw body 121.

  Further, the stopper device 181 of the present embodiment is configured to be able to appropriately select which of the plurality of step portions 181a to 181d abuts by changing the protruding amount of the stop pin 183, and changes the protruding amount of the stop pin 183. By simply performing the simple operation, the inclination angle of the circular saw body 121 can be easily set to any one of a plurality of normal inclination angle positions, and the workability of the adjustment operation of the inclination angle can be improved. Further, the abutting direction of the stop pin 183 and the step portions 181a to 181d and the protruding amount adjustment direction of the stop pin 183 intersect each other. For this reason, the force at the time of contact does not move the stop pin 183 in the axial direction in which the protruding amount changes, and the protruding position of the stop pin 183 is maintained. Therefore, the circular saw main body 121 can be reliably locked at the selected normal inclination angle position.

  In the present embodiment, the plurality of step portions 181 a to 181 d intersect with the axis of the rotation shaft 137 so that the depth direction of the plurality of step portions 181 a to 181 d is the axis direction of the rotation shaft 137. Provided on the surface. The stop pin 183 is configured to move in a direction parallel to the axial direction of the rotation shaft 137 to change the protruding amount between a plurality of restriction positions. For this reason, the side surface region in the axial direction of the rotation shaft 137 that is likely to become a dead space can be effectively used as an operation region for changing the protrusion amount of the stop pin 183.

  The stop pin 183 is provided with a plurality of cam surfaces 189a to 189e having different axial heights in the circumferential direction, and is held at the first to fifth protruding positions by using so-called spiral stepped cam surfaces. It is a configuration. For this reason, the stop pin 183 can be changed to each projecting position and held by a simple operation by performing an axial movement operation and a rotation operation around the axis. Further, the cam surfaces 189a to 189e and the projecting portion 185a of the operation knob 185 are configured to engage with each other while receiving an urging force from the urging spring 182, so that the engagement state (holding state) is stable. To do.

  Further, the stopper device 181 of the present embodiment is configured to be disposed between the opposing wall surfaces of the angler guide 113 and the angular case 135. For this reason, it is possible to protect the stopper device 181 from dust generated at the time of cutting the workpiece, and to maintain the smoothness of the operation of the stopper device 181.

By the way, in the adjustment of a plurality of regular inclination angles by the stopper device 181, a normal inclination angle cannot be obtained due to a dimensional error at the time of manufacturing the stopper device 181 composed of a plurality of parts or an error at the time of assembly. On the other hand, even when a normal inclination angle is obtained, there is a case where it is desired to use an inclination angle near the inclination angle. For this reason, there are cases where it is desired to finely adjust the inclination angle of the circular saw body 121 without being restricted by the stop pin 183 in the vicinity of a plurality of normal inclination angles. At this time, as described above, the stop pin 183 is set at the fifth projecting position as the restriction release position, that is, the projecting portion 185a of the operation knob 185 is engaged with the fifth cam surface 189e. The first to fourth step portions 181a to 181d are prevented from coming into contact with the tip 183a of the pin 183. By doing in this way, the fine adjustment operation | movement of the inclination-angle of the circular saw main-body part 121 can be performed easily and correctly, without receiving the restrictions by the said stop pin 183.
Thus, according to the present embodiment, the tilt angle adjustment using the stop pin 183, because the configuration that can cancel the restriction of the tilt angle of the circular saw body 121 by the stop pin 183 as necessary, It is possible to selectively use the tilt angle adjustment without using the stop pin 183, and the portable circular saw 101 that is easy to use when adjusting the tilt angle of the circular saw body 121 is provided.

  In the present embodiment, when the circular saw body 121 is rotated to the side where the inclination angle is increased, the inclination angle of the circular saw body 121 is regulated. You may change to the structure which performs inclination angle regulation when rotating to the minimum inclination angle side from an inclination angle. In the present embodiment, the angular guide 113 is provided with the stop pin 183 and the angular case 135 is provided with the step portions 181a to 181d. However, this arrangement is reversed, that is, the angular guide 113 is provided with the step portion 181a. ˜181d may be provided, and the angular pin 135 may be provided with the stop pin 183.

(Second embodiment of the present invention)
Next, a second embodiment of the present invention will be described with reference to FIGS. The second embodiment relates to a modified example of the stopper device 181 that regulates the normal inclination angle of the circular saw body 121 in the inclined cutting mechanism 131 according to the first embodiment described above. Other configurations except the stopper device 191 that regulates the regular inclination angle according to the second embodiment are configured in the same manner as in the first embodiment described above. Therefore, among the illustrated members, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  As shown in FIGS. 12 and 13, the stopper device 191 includes four stepped portions constituting the contact surface, that is, the first to fourth stepped portions 191 a to 191 d, as in the first embodiment. The stop pin 193, the biasing spring 192, and the operation knob 195 are mainly configured, and the constituent members excluding the operation knob 195 are disposed between the opposing wall surfaces of the angular case 135 and the angular guide 113. The 1st-4th step part 191a-191d is provided in the front surface of the angular guide 113 which is a base side member. In FIG. 12, the angular guide 113 is indicated by a two-dot chain line. The stop pin 193 is provided on the angular case 135 that is a circular saw body side member. Each of the first to fourth step portions 191 a to 191 d having a predetermined step is a direction in which the depth direction intersecting the step direction is parallel to the axis of the rotary shaft 137, that is, in the front-rear direction of the circular saw body 121. Of the step portions 191a to 191d, the fourth step portion 191d is configured by an adjusting screw 181e attached to the nut member 181f as in the case of the first embodiment. The contact position of the pin 193 with the fourth engagement arm 193d can be finely adjusted.

  The stop pin 193 is disposed on the rear surface side that is the surface facing the angular guide 113 of the angular case 135. The stop pin 193 having a circular cross section as a rod-shaped member is disposed so that its axial direction intersects the surface direction of the angular guide 113, that is, the first to fourth step portions 191a to 191d, and the angular guide. It is attached to 113 so as to be movable in the axial direction and to be rotatable around the axis. Then, it can be operated by an operation knob 195 fixed to the end of the stop pin 193 in a fixed manner.

  The stop pin 193 has four engagement arm portions 193a to 193d that protrude from the distal end side thereof at different lengths in the radial direction of the stop pin 193 and are arranged at equal intervals (90-degree intervals) around the axis. Have That is, the stop pin 193 includes first to fourth engagement arm portions 193a to 193d corresponding to the first to fourth step portions 191a to 191d. The engagement arm portions 193a to 193d have different radial protrusion amounts from the axis of the stop pin 193, and the difference in radial protrusion amount of the engagement arm portions 193a to 193d is the first to fourth differences. This corresponds to the steps of the step portions 191a to 191d. An engaging part is comprised by the 1st-4th engaging arm part 193a-193d. One of the first to fourth engagement arm portions 193a to 193d is placed in a contactable position (position approaching the step portions 191a to 191d) that can contact the step portions 191a to 191d, It is configured to switch between the contact possible position and the contact impossible position so that the other three cannot be contacted (positions separated from the step portions 191a to 191d). By performing such switching, the first to fourth engagement arm portions 193a to 193d are in the depth direction of the first to fourth step portions 191a to 191d when placed in the contactable position. The relative positions will be different. That is, in the present embodiment, when the stop pin 193 is rotated, any one of the first to fourth engagement arm portions 193a to 193d can be brought into contact with the step portions 191a to 191d. (See FIGS. 14 to 17).

  The stopper device 191 includes a stop pin holding mechanism 196 that holds the stop pin 193 at a position where the stop pin 193 is rotated. The stop pin holding mechanism 196 includes a cross groove 196a formed in the angular guide 113 and a single protrusion 196b formed in the axial end surface of the operation knob 195 and extending in the radial direction. The rotation of the stop pin 193 is prohibited when the 196b is engaged, and the rotation of the stop pin 193 is allowed when the engagement is released. As a result, the stop pin 193 can be positioned and held in units of 90 degrees. The engagement of the protrusion 196b with the cross groove 196a is reliably held by the urging force of the urging spring 192.

  When the stop pin 193 is pulled 45 degrees after being pulled forward, all of the first to fourth engaging portions 193a to 193d are disengaged from the relative movement line with the first to fourth step portions 191a to 191d. Rotated to position. This is shown in FIG. 12 by a two-dot chain line (I). This position is set as a restriction release position for releasing the inclination angle restriction of the circular saw body 121. At this time, the circular saw body 121 can be freely rotated between a minimum inclination angle position (0 degree) and a maximum inclination angle position (for example, 48 degrees) and adjusted to an arbitrary inclination angle. . That is, the fine adjustment operation of the inclination angle of the circular saw body 121 can be easily performed without being restricted by the stop pin 193.

  The stopper device 191 according to the present embodiment is configured as described above, and the normal inclination angle of the circular saw body 121 is controlled by operating the stop pin 193. Select according to which engagement arm portion 193a to 193d of the first to fourth engagement arm portions 193a to 193d is positioned at a position where contact with the fourth step portions 191a to 191d is possible. can do. Although the restriction angle is not shown for convenience, the restriction angle is selected by aligning the pointer of the operation knob 195 with a scale provided around the operation knob 195 for indicating the inclination angle to be restricted. FIG. 14 shows a case where the first engagement arm portion 193a is selected. At this time, when the circular saw body 121 is rotated about the rotation shaft 137 by loosening the lock screw 139, the first engagement arm 193a contacts the first step 191a, so that the circular saw body 121 The inclination angle is restricted to the first common inclination angle position (for example, 15 degrees). FIG. 15 shows the case where the first engagement arm portion 193b is selected. At this time, when the circular saw body 121 is rotated about the rotation shaft 137 by loosening the lock screw 139, the second engagement arm 193b comes into contact with the second step 191b, so that the circular saw body 121 The inclination angle is restricted to the second common inclination angle position (for example, 22.5 degrees).

FIG. 16 shows a case where the third engagement arm portion 193c is selected. At this time, when the circular saw body 121 is rotated about the rotation shaft 137 by loosening the lock screw 139, the third engagement arm 193c comes into contact with the third step 191c so that the circular saw body 121 The inclination angle is restricted to the third common inclination angle position (for example, 30 degrees). Further, FIG. 17 shows a case where the fourth engagement arm portion 193d is selected. At this time, when the circular saw body 121 is rotated about the rotation shaft 137 by loosening the lock screw 139, the fourth engagement arm 193d comes into contact with the fourth step 191d, so that the circular saw body 121 The inclination angle is restricted to the fourth common inclination angle position (for example, 45 degrees).
Thus, if the circular saw body 121 is restricted to the first, second, third, or fourth regular inclination angle restriction position, then the lock screw 139 is tightened so that the circular saw body 121 becomes the base 111. The cutting operation can be performed at a regular inclination angle fixed and adjusted.

  As described above, according to the present embodiment, any one of the first to fourth engagement arm portions 193a to 193d is selectively positioned at the contactable position with respect to the step portions 191a to 191d. When the circular saw body 121 is rotated about the rotation shaft 137, the selected one of the first to fourth step portions 191a to 191d is selected with respect to the selected engagement arm portion 193a to 193d. Only one step portion 191a to 191d corresponding to the one engagement arm portion 193a to 193d is brought into contact. Thus, the inclination angle of the circular saw main body 121 can be restricted to the normal inclination angle position corresponding to the selected one engagement arm part 193a to 193d.

  Moreover, according to this Embodiment, it is the structure which regulates the inclination-angle of the circular saw main-body part 121 by engaging arm part 193a-193d contact | abutting with respect to step part 191a-191d. For this reason, the circular saw main body 121 can be reliably locked to the predetermined regular inclination angle position without exceeding the inclination angle position to be regulated. On the other hand, when the circular saw body 121 is rotated to switch from one normal inclination position to another normal inclination angle position, or when returning to the minimum inclination angle position for right-angle cutting, the circular saw body 121 is Since no resistance force that hinders the rotation operation is applied, the rotation operation can be easily performed. For this reason, the portable circular saw 101 that is easy to use when adjusting the inclination angle of the circular saw body 121 can be provided.

  In this embodiment, the circular saw body 121 is configured to regulate the inclination angle of the circular saw body 121 when the circular saw body 121 rotates to the side where the inclination angle is increased. You may change to the structure which performs inclination-angle control when rotating to the minimum inclination-angle side from an angle. Further, in this embodiment, the angular guide 113 is provided with the step portions 191a to 191d and the angular case 135 is provided with the stop pin 193. However, this arrangement is reversed, that is, the angular guide 113 is provided with the stop pin 193. The angular case 135 may be provided with step portions 191a to 191d.

(Third embodiment of the present invention)
Next, a third embodiment of the present invention will be described with reference to FIGS. The third embodiment relates to a modified example of the stopper device 181 that regulates the regular inclination angle of the circular saw body 121 in the inclined cutting mechanism 131 according to the first embodiment described above. Other configurations except the stopper device 211 that regulates the regular inclination angle according to the third embodiment are configured in the same manner as in the first embodiment described above. Therefore, among the illustrated members, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  As shown in FIGS. 18 and 19, the stopper device 211 according to the present embodiment includes four steps, that is, first to fourth steps 211a to 211d, a stop pin 213, and an operation knob 215. Constituent members configured as a main body and excluding the operation knob 215 are disposed between the opposing wall surfaces of the angular case 135 and the angular guide 113. In the first to fourth step portions 211a to 211d, the depth direction of each step portion 211a to 211d is in the vertical direction on the front surface of the angular guide 113 which is a base side member (the radial direction when viewed from the rotation axis of the rotation shaft 137). ). The first step portion 211a, the second step portion 211b, the third step portion 211c, and the fourth step portion 211d are set in this order toward the rotation axis of the rotation shaft 137. Of the stepped portions 211a to 211d, the fourth stepped portion 211d is configured by an adjusting screw 211e attached to the nut member 211f, as in the case of the first embodiment, and is an engaging pin 213a of the stop pin 213. Can be finely adjusted. In FIG. 18, the angular guide 113 is indicated by a two-dot chain line.

  On the other hand, the stop pin 213 having a circular cross-section as a rod-shaped member rotates to the angular case 135 while penetrating the angular case 135 in the front-rear direction so as to be parallel to the axis of the rotation shaft 137. The operation knob 215 is freely attached and can be rotated by an operation knob 215 fixedly fixed to an end protruding from the rear surface of the angular case 135.

  An engaging pin 213a as an engaging portion is provided on the distal end side in the axial direction of the stop pin 213 (opposite side of the operation knob 215) via an arm portion 213b extending in the radial direction. In other words, the stop pin 213 is configured to have the engagement pin 213a at a position eccentric from the axis of the stop pin 213. The engaging pin 213a changes the position in the depth direction of the first to fourth step portions 211a to 211d by rotating the stop pin 213. That is, in the present embodiment, the engaging pin 213a has a first position that can be engaged with the first step portion 211a and a second position that can be engaged with the second step portion 211b by the rotation operation of the stop pin 213. 2 positions, a third position engageable with the third step portion 211c, a fourth position engageable with the fourth step portion 211d, and further contact with any of the first to fourth step portions 211a to 211d. Switching between a total of five engagement positions with the fifth position as the restriction release position that is not allowed is possible. (See FIGS. 18 to 24).

  Further, as shown in FIG. 19, the stop pin 213 is operated after the ball 216a provided on the operation knob 215 side is pressed and engaged by the spring member 216c with the recess 216b provided in the angular case 135. The selected position is held at the selected position. These balls 216a, recesses 216b, and spring members 216c constitute a stop pin holding mechanism 216. Note that five recesses 216b are provided around the axis of the stop pin 213 corresponding to the first to fifth positions to which the engagement pin 213a is moved.

  The stopper device 211 according to the present embodiment is configured as described above. As to which normal inclination angle position of the circular saw body 121 is controlled, the stop pin 213 is operated to operate the first to first positions. Selection can be made by changing the position in the depth direction of the engagement pin 213a with respect to the four step portions 211a to 211d. Although the restriction angle is not shown for convenience, the restriction angle is selected by aligning the pointer of the operation knob 215 with a scale indicating the inclination angle to be restricted provided around the operation knob 215. FIG. 20 shows a case where the engagement pin 213a is placed at a position farthest from the rotation shaft 137, that is, the first position. At this time, when the circular saw body 121 is rotated about the rotation shaft 137 by loosening the lock screw 139, the engagement pin 213a contacts the first step 221a, so that the inclination angle of the circular saw body 121 is increased. The first regular inclination angle position (for example, 15 degrees) is regulated. FIG. 21 shows a case where the engaging pin 213a is placed at the second position. At this time, when the circular saw body 121 is rotated about the rotation shaft 137 by loosening the lock screw 139, the engagement pin 213a comes into contact with the second step portion 211b, so that the inclination angle of the circular saw body 121 is increased. The second regular inclination angle position (for example, 22.5 degrees) is regulated.

Similarly, FIG. 22 shows a case where the engagement pin 213a is placed at the third position. At this time, when the circular saw body 121 is rotated about the rotation shaft 137 by loosening the lock screw 139, the engaging pin 213a comes into contact with the third step 221c, so that the inclination angle of the circular saw body 121 is increased. It is restricted to the third common inclination angle position (for example, 30 degrees). FIG. 23 shows a case where the engagement pin 213a is placed at the fourth position. At this time, when the circular saw body 121 is rotated about the rotation shaft 137, the engagement pin 213a comes into contact with the fourth step portion 211d, so that the inclination angle of the circular saw body 121 becomes the fourth common inclination angle. The position is regulated (for example, 45 degrees). Since the fourth step portion 211d that regulates the fourth common inclination angle position is configured by the adjustment screw 211e, the fourth common inclination angle position can be finely adjusted as necessary.
Thus, if the circular saw body 121 is restricted to the first, second, third, or fourth regular inclination angle restriction position, then the lock screw 139 is tightened so that the circular saw body 121 becomes the base 111. The cutting operation can be performed at a regular inclination angle fixed and adjusted.

  FIG. 24 shows a case where the engagement pin 213a is switched to the fifth position as the restriction release position. At this time, the engaging pin 213a is moved to a position where it does not come into contact with any of the first to fourth step portions 221a to 221d. Therefore, at this time, the inclination angle of the circular saw body 121 can be arbitrarily adjusted between the minimum inclination angle position (0 degree) and the maximum inclination angle position (for example, 48 degrees). That is, the fine adjustment operation of the inclination angle of the circular saw body 121 can be easily performed without being restricted by the engagement pin 213a.

  As described above, according to the present embodiment, the angle of inclination of the circular saw body 121 is regulated by the engagement pins 213a coming into contact with the step portions 211a to 211d. For this reason, as in the first or second embodiment described above, the circular saw body 121 is securely locked to the predetermined regular inclination angle position without exceeding the inclination angle position to be regulated. It becomes. When the circular saw body 121 is rotated to switch from one normal inclination position to another normal inclination angle position, or when returning to the minimum inclination angle position for right-angle cutting, the circular saw body 121 is Since no resistance force that hinders the rotation operation is applied, the rotation operation can be easily performed. For this reason, the portable circular saw 101 that is easy to use when adjusting the inclination angle of the circular saw body 121 can be provided.

  Further, according to the present embodiment, since the first to fourth step portions 211a to 211d are all arranged on one side (upper side) of the stop pin 213, the circular saw body 121 is set to the minimum inclination angle position. When returning, the engaging pin 213 can move together with the circular saw body 121 without interfering with the first to fourth step portions 211a to 211d. Further, since the first to fourth step portions 211 a to 211 d are provided on the upper side far from the rotation shaft 137, the inclination angle regulation accuracy is easily obtained as compared with the case of being provided on the lower side near the rotation shaft 137.

  In addition, the stopper device 211 of the present embodiment is configured such that one engagement pin 213a provided on the stop pin 213 selectively contacts the first to fourth step portions 211a to 211d. For this reason, the number of components of the stopper device 211 is small, which is advantageous in simplifying the structure and reducing the number of manufacturing steps or assembly steps.

  In this embodiment, the circular saw body 121 is configured to regulate the inclination angle of the circular saw body 121 when the circular saw body 121 rotates to the side where the inclination angle is increased. You may change to the structure which performs inclination-angle control when rotating to the minimum inclination-angle side from an angle. In the present embodiment, the angular guide 113 is provided with the step portions 211a to 211d, and the angular case 135 is provided with the stop pin 213. However, this arrangement is reversed, that is, the angular guide 113 is provided with the stop pin 213. , And the angular case 135 may be provided with step portions 211a to 211d.

(Fourth embodiment of the present invention)
Next, a fourth embodiment of the present invention will be described with reference to FIGS. The fourth embodiment is a further modification of the stopper device 211 according to the third embodiment described above, and other configurations except for the stopper device 221 that regulates the regular inclination angle according to the fourth embodiment. Is configured in the same manner as each of the embodiments described above. Therefore, among the illustrated members, the same components as those in the embodiments are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  As shown in FIGS. 25 and 26, the stopper device 221 according to the present embodiment includes first to fourth step portions 221 a to 221 d formed on an angular guide 113 that is a base side member, and a circular saw body portion. A stop pin 223 attached to the angular case 135 as a side member and an operation knob 225 of the stop pin 223 are mainly configured. On the side of the angular guide 113 facing the angular case 135, an arcuate movement path 224 is formed when the stop pin 223 rotates around the rotation axis 137 together with the angular case 135. The first and second step portions 221a and 221b are formed on the wall surface 224a on the upper side of the moving path 224 (the side far from the rotation shaft 137), and the third wall surface 224b on the lower side (side closer to the rotation shaft 137). A stepped portion 221c is formed, and a fourth stepped portion 221d is provided at one end of the moving path 224 in the extending direction. The step portions 221a to 221d are provided such that the depth direction of the step portions 221a to 221d is the vertical direction (the radial direction when viewed from the rotation axis of the rotation shaft 137). Of the stepped portions 221a to 221d, the fourth stepped portion 221d is configured by an adjusting screw 221e attached to the nut member 221f, as in the case of each embodiment, and has a fine contact position with the stop pin 223. Adjustment is possible.

  On the other hand, the stop pin 223 having a circular cross-section as a rod-shaped member extends forward and backward through the angular case 135 so as to be parallel to the rotational shaft 137 and is rotatable to the angular case 135. Is attached. An operation knob 225 is attached to the end of the stop pin 223 protruding from the rear surface of the angular case 135 in a state where relative movement in the circumferential direction is restricted, and the stop pin 223 is rotated by the operation knob 225. It is possible.

  A first projecting portion 223a that projects at a predetermined length in the radial direction at intervals of 90 degrees in the circumferential direction of the stop pin 223, on the tip side of the stop pin 223 (opposite side of the operation knob 225), A second protruding portion 223b having a shorter radial protruding length than the first protruding portion 223a, an equal diameter portion 223c in which the radial length does not change, and a contact avoiding portion 223d having a reduced radial length are provided. Is provided. An engaging part is comprised by the 1st protrusion part 223a, the 2nd protrusion part 223b, and the equal diameter part 223c.

  As shown in FIG. 26, the stop pin 223 is restricted from moving in the axial direction with respect to the angular case 135. The operation knob 225 is connected to the stop pin 223 through a coil spring 226c in a state where relative movement in the axial direction is permitted. The operation knob 225 has an axial end surface pressed against the angular case 135 by the urging force of the coil spring 226c, and has four convex portions 226a at intervals of 90 degrees in the circumferential direction of the end surface. Is engaged with four recesses 226 b formed in the angular case 135. As a result, the stop pin 223 can be rotated in units of 90 degrees and held at the position after the operation. A stop pin holding mechanism 226 is configured by the convex portion 226a, the concave portion 226b, and the coil spring 226c.

  The stopper device 221 according to the present embodiment is configured as described above. Regarding the regular inclination angle position regulation of the circular saw body 121, the stop pin 223 is rotated and the first to fourth stages are operated. This is done by selecting which of the first projecting part 223a, the second projecting part 223b, or the equal diameter part 223c is brought into contact with the parts 221a to 221d. Although not shown for convenience, the selection is performed by aligning the pointer of the operation knob 225 with a scale provided around the operation knob 225 for indicating the inclination angle to be regulated.

  FIG. 27 shows a case where the operation knob 225 is adjusted to the first common inclination angle. At this time, when the lock screw 139 is loosened and the circular saw body 121 is rotated around the rotation shaft 137, the first protrusion 223a of the stop pin 223 contacts the first step 221a. As a result, the circular saw body 121 is restricted to the first normal inclination angle position (for example, 15 degrees). FIG. 28 shows a case where the operation knob 225 is adjusted to the second common inclination angle. At this time, when the lock screw 139 is loosened and the circular saw body 121 is rotated about the rotation shaft 137, the second protrusion 223b of the stop pin 223 comes into contact with the second step 221b. As a result, the circular saw body 121 is restricted to the second normal inclination angle position (for example, 22.5 degrees). FIG. 29 shows a case where the operation knob 225 is adjusted to the third common inclination angle. At this time, when the lock screw 139 is loosened and the circular saw body 121 is rotated about the rotation shaft 137, the first protrusion 223a of the stop pin 223 comes into contact with the third step 221c. Thereby, the circular saw main body 121 is regulated to the third regular inclination angle position (for example, 30 degrees).

  FIG. 30 shows a case where the operation knob 225 is adjusted to the fourth common inclination angle. At this time, when the lock screw 139 is loosened and the circular saw body 121 is rotated about the rotation shaft 137, the equal-diameter portion 223d of the stop pin 223 comes into contact with the fourth step portion 221d. As a result, the circular saw body 121 is restricted to the fourth normal inclination angle position (for example, 45 degrees). In addition, since the 4th step part 221d is comprised by the adjustment screw 221e, it can perform the fine adjustment of the said 4th regular inclination angle as needed.

  FIG. 31 shows a case where the operation knob 225 is set to the restriction release position (maximum tilt angle position). At this time, the circumferential position of the stop pin 223 is determined so that the contact avoiding portion 223d is positioned to face the fourth step portion 221d. For this reason, when the lock screw 139 is loosened and the circular saw body 121 is rotated around the rotation shaft 137, the lock screw 139 is not moved before the constant diameter portion 223d of the stop pin 223 comes into contact with the fourth step portion 221d. The circular saw main body 121 comes into contact with the end of the guide groove 113a and is restricted to the maximum inclination angle. At this time, the inclination angle of the circular saw body 121 can be arbitrarily adjusted between the minimum inclination angle position (0 degree) and the maximum inclination angle position (for example, 48 degrees). That is, the fine adjustment operation of the inclination angle of the circular saw body 121 can be easily performed without being restricted by the stop pin 223.

As described above, according to the stopper device 221 according to the present embodiment, the first and second projecting portions 221a and 221b and the equal-diameter portion 221c come into contact with the step portions 221a to 221d, thereby the circular saw body 121. It is the structure which regulates the inclination angle. For this reason, as in the third embodiment described above, the circular saw body 121 is securely locked to the predetermined regular inclination angle position without exceeding the inclination angle position to be regulated. When the circular saw body 121 is rotated to switch from one normal inclination position to another normal inclination angle position, or when returning to the minimum inclination angle position for right-angle cutting, the circular saw body 121 is Since no resistance force that hinders the rotation operation is applied, the rotation operation can be easily performed. For this reason, the portable circular saw 101 that is easy to use when adjusting the inclination angle of the circular saw body 121 can be provided.
In particular, in this embodiment, the step portions 221a to 223c for restricting the inclination angle are arranged separately on both sides of the moving path 224 when the stop pin 223 moves together with the circular saw body 121 around the rotation shaft 137. The stop pin 223 has a configuration in which first and second projecting portions 221a and 221b and an equal-diameter portion 221c are provided as a plurality of engaging portions having different projecting lengths in the radial direction. For this reason, the stopper device 221 can be made compact by suppressing the maximum length of the engaging portion protruding in the radial direction from the stop pin 223.

  In this embodiment, the circular saw body 121 is configured to regulate the inclination angle of the circular saw body 121 when the circular saw body 121 rotates to the side where the inclination angle is increased. You may change to the structure which performs inclination-angle control when rotating to the minimum inclination-angle side from an angle. In the present embodiment, the step 221a to 221d is provided in the angular guide 113 and the stop pin 223 is provided in the angular case 135. However, this arrangement is reversed, that is, the stop pin 223 is provided in the angular guide 113. And step portions 221 a to 221 d may be provided on the angular case 135.

In view of the gist of the invention, the following aspects can be configured.
(Aspect 1)
The portable circular saw according to claim 1, wherein
The portable circular saw, wherein the engaging member is movable to a third protruding position where the engaging member cannot be brought into contact with each of the first and second stepped portions.

  According to the first aspect of the present invention, the engagement member can be moved to the third protruding position where the engagement member cannot be brought into contact with each of the first and second stepped portions. Therefore, in a state where the engaging member is moved to the third projecting position as the restriction release position, it is possible to adjust the inclination angle of the circular saw body without being restricted by the engaging member. For this reason, it is possible to easily and accurately perform the fine angle adjustment work near the normal inclination angle that is affected by the restriction by the engaging member.

It is a perspective view showing the whole portable circular saw composition concerning a 1st embodiment of the present invention. It is a front view which shows the whole structure of a portable circular saw. It is an enlarged view which shows a stopper apparatus. It is sectional drawing which shows a stopper apparatus. It is sectional drawing explaining the contact aspect of the stop pin with respect to 4 step parts. It is a figure which expand | deploys and shows the cam surface of an end surface cam part. It is a figure which shows the inclination angle control aspect by a stopper apparatus, and shows the state controlled by the 1st regular inclination angle (15 degree | times). It is a figure which shows the inclination angle control aspect by a stopper apparatus, and shows the state controlled by the 2nd regular inclination angle (22.5 degree | times). It is a figure which shows the inclination angle control aspect by a stopper apparatus, and shows the state controlled by the 3rd regular inclination angle (30 degree | times). It is a figure which shows the inclination angle control aspect by a stopper apparatus, and shows the state controlled by the 4th regular inclination angle (45 degree | times). It is a figure which shows the state by which the circular saw main-body part was controlled by the maximum inclination angle. It is a front view which shows the stopper apparatus which concerns on the 2nd Embodiment of this invention. It is AA sectional view taken on the line of FIG. It is a figure which shows the inclination angle control aspect by a stopper apparatus, and shows the state controlled by the 1st regular inclination angle (15 degree | times). It is a figure which shows the inclination angle control aspect by a stopper apparatus, and shows the state controlled by the 2nd regular inclination angle (22.5 degree | times). It is a figure which shows the inclination angle control aspect by a stopper apparatus, and shows the state controlled by the 3rd regular inclination angle (30 degree | times). It is a figure which shows the inclination angle control aspect by a stopper apparatus, and shows the state controlled by the 4th regular inclination angle (45 degree | times). It is a front view which shows the stopper apparatus which concerns on the 3rd Embodiment of this invention. It is the BB sectional view taken on the line of FIG. It is a figure which shows the inclination angle control aspect by a stopper apparatus, and shows the state controlled by the 1st regular inclination angle (15 degree | times). It is a figure which shows the inclination angle control aspect by a stopper apparatus, and shows the state controlled by the 2nd regular inclination angle (22.5 degree | times). It is a figure which shows the inclination angle control aspect by a stopper apparatus, and shows the state controlled by the 3rd regular inclination angle (30 degree | times). It is a figure which shows the inclination angle control aspect by a stopper apparatus, and shows the state controlled by the 4th regular inclination angle (45 degree | times). It is a figure which shows the state by which the circular saw main-body part was controlled by the maximum inclination angle. It is a front view which shows the stopper apparatus which concerns on the 4th Embodiment of this invention. It is a longitudinal cross-sectional view similarly. It is a figure which shows the inclination angle control aspect by a stopper apparatus, and shows the state controlled by the 1st regular inclination angle (15 degree | times). It is a figure which shows the inclination angle control aspect by a stopper apparatus, and shows the state controlled by the 2nd regular inclination angle (22.5 degree | times). It is a figure which shows the inclination angle control aspect by a stopper apparatus, and shows the state controlled by the 3rd regular inclination angle (30 degree | times). It is a figure which shows the inclination angle control aspect by a stopper apparatus, and shows the state controlled by the 4th regular inclination angle (45 degree | times). It is a figure which shows the state by which the circular saw main-body part was controlled by the maximum inclination angle.

DESCRIPTION OF SYMBOLS 101 Portable circular saw 111 Base 113 Angular guide 113a Guide groove 113c Scale 121 Circular saw main-body part 123 Blade 125 Blade case 127 Motor housing 129 Hand grip 131 Inclination cutting mechanism 132 Inclination angle indicator 133 Inclination angle adjustment mechanism 135 Angular case 137 Rotating shaft 139 Lock screw (fixing device)
139a Operation knob 181 Stopper device (regulator device)
181a to 181d First step portion to fourth step portion 181e Adjustment screw 181f Nut member 182 Biasing spring 183 Stop pin 183a Tip 183b Stop ring 184 Guide hole 185 Operation knob 185a Projection section 186 Stop ring 187 Coil spring 188 Stop pin holding mechanism 189 End face cam portions 189a to 189e First cam surface to fifth cam surface 191 Stopper devices 191a to 191d First step portion to fourth step portion 191e Adjustment screw 191f Nut member 192 Biasing spring 193 Stop pin 195 Operation knob 196 Stop pin Holding mechanism 196a Cross groove 196b Protrusion 211 Stopper devices 211a to 211d First step portion to fourth step portion 211e Adjustment screw 211f Nut member 213 Stop pin 213a Engagement pin 213b Arm portion 215 Operation knob 216 Stop pin holding mechanism 21 6a Ball 216b Recessed portion 216c Spring member 221 Stopper devices 221a to 221d First step portion to fourth step portion 221e Adjustment screw 221f Nut member 223 Stop pin 223a First protrusion portion 223b Second protrusion portion 223c Equal diameter portion 223d Contact avoidance portion 224 Moving wall 224a Upper wall surface 224b Lower wall surface 225 Operation knob 226 Stop pin holding mechanism 226a Convex part 226b Concave part 226c Coil spring

Claims (3)

Base and
A circular saw body having a saw blade;
The circular saw body is connected to the base so as to be relatively rotatable in a direction intersecting the cutting direction of the saw blade, and the inclination angle of the circular saw body with respect to the base can be adjusted. A pivot axis;
A fixing device capable of fixing the circular saw body rotated around the rotation axis by an operation of a user and placed at an arbitrary inclination angle position to the base by an operation of the user;
When the circular saw main body rotated about the rotation axis reaches the normal inclination angle position of the first or second normal inclination angle position set in the rotation operation range. a portable circular saw having a regulating device for regulating the circular saw main body lock free rotational movement to the common tilt angle position,
The regulating device is
The circular saw body or the base is provided corresponding to each of the first and second common inclination angle positions, and defines the first and second common inclination angle positions, respectively. And a second step,
When the circular saw body portion is provided on either the circular saw body portion or the base, and the circular saw body portion is rotated to either the side on which the inclination angle with respect to the base is increased or decreased, the first The circular saw body is defined by the engaged step of the first and second common inclined angle positions by engaging either one of the second step or the second step. One engaging member that regulates at any one of the common inclination angle positions,
The first and second stepped portions are set on the intersecting surface with the axis of the rotating shaft so that the depth direction intersecting the step direction is the axial direction of the rotating shaft;
The engaging member protrudes in the depth direction of the first and second step portions, and is movable between the first and second protruding positions having different protruding amounts. In the state moved to the one projecting position, the circular saw body is locked at the first common inclination angle position by engaging only with the first step in the direction intersecting the projecting direction, A configuration in which the circular saw body is locked at the second normal inclination angle position by engaging only with the second stepped portion in a direction intersecting the protruding direction when moved to the second protruding position. is a,
The restriction device is provided corresponding to each of the first and second protruding positions of the engaging member, and the engaging member is set to one of the first and second protruding positions. Having first and second cam surfaces to hold;
The engagement member is constituted by a rod-like member that is movable in a long axis direction parallel to the axial direction of the rotation shaft and is rotatable about the long axis.
The first and second cam surfaces are arranged around the major axis of the rod-shaped member and have a step corresponding to the step of the first and second step portions in the major axis direction of the rod-shaped member. And
The rod-shaped member has a protruding portion that is selectively engaged with either the first or second cam surface in the major axis direction of the rod-shaped member, and the protruding portion is the first portion. Alternatively, in a state in which one of the second cam surfaces is engaged, the rod-shaped member is moved in a direction opposite to the protruding direction, whereby the protruding portion with respect to the first or second cam surface is moved. When the engagement is released and the rod-shaped member is rotated in the released state in the circumferential direction and moved in the protruding direction after the rotation operation, the protruding portion becomes the first or second cam surface. A portable circular saw characterized in that the rod-like member is held at the first or second protruding position by being engaged with the other cam surface . The portable circular saw according to claim 1 , wherein
A biasing member that biases the rod-shaped member in the protruding direction, and the projecting portion engages the first or second cam surface while being biased by the biasing member; A portable circular saw characterized by The portable circular saw according to claim 1 or 2 ,
The circular saw body and the base are opposed wall surfaces that move relative to each other without changing the facing distance when the circular saw body is rotated relative to the base around the axis of the rotation shaft. A portable circular saw having the restriction device disposed between the opposing wall surfaces.

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