JP2013078864A - Portable cutting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable cutting machine, by which corner cutting work can be performed without removing a sub base from a main base.SOLUTION: The portable cutting machine includes: a body part 101 having a motor housing 103 for housing a motor, a saw blade 106 to be rotatinally driven by the motor, and a saw cover 107 for partially covering the outer periphery of the saw blade; and a base part 1 which is connected to the body part and made to slide on the material to be machined. The base part includes: the main base 2 connected to the body part; the sub base 3 arranged to be moved relatively to the main base; and an adjustment mechanism for changeably disposing the sub base at optional angles relative to the main base.

Description

  The present invention relates to a portable cutting machine, and more particularly to a portable cutting machine suitable for cutting work when a floor material is cut along a wall.

  A portable circular saw that is a conventional portable cutting machine is shown in FIG. The portable circular saw 100 includes a motor housing 103 that houses a motor, a handle 104 that is held by an operator, a battery mounting portion 105 that is provided at a handle end portion and is mounted with a battery pack that serves as a motor drive source, and a saw blade 106. The main body 101 is composed of a saw cover 107 that covers a part, and a base 102 that is connected to the main body 101 and slides on a workpiece. The base portion 102 includes a main base 108 connected to the main body portion 101 and a sub base 109 that is detachably attached to the main base 108.

  As shown in FIG. 8, the sub-base 109 is composed of a sub-base body 110 and two guide bars 111, and the two guide bars 111 are fixed near both ends of the sub-base body 110 by welding or the like. The knob 112 is detachably fixed to the main base 108.

JP 2006-2724669 A

  In each case, it was necessary to remove the sub-base from the main base. Furthermore, when performing the linear cutting, it is necessary to attach a separate guide instead of the sub-base. Therefore, depending on the work contents, the sub-base must be removed from the main base, and there is a problem that the sub-base is lost or a storage place is required.

  Also, when working with the sub-base removed, the contact surface with the work piece becomes smaller and the distance from the side of the main base to the saw blade is short, so the balance when placed on the work piece is balanced. There was a bad thing. In particular, when the main body portion is cut by being inclined 45 degrees in the direction away from the base portion, the balance may be poor and the inclined cutting may not be performed.

  Therefore, the present invention has an object to provide a portable cutting machine that improves the above-described problems and can perform stable work in various work applications such as normal cutting work, cutting work, and inclined cutting work.

  The object is to provide a main body having a motor housing that houses a motor, a saw blade that is rotationally driven by the motor, and a saw cover that covers a part of the outer periphery of the saw blade, and a slide connected to the main body on the workpiece. In the portable cutting machine including a moving base portion, the base portion includes a main base coupled to the main body portion, and a sub-base provided to be movable with respect to the main base. This can be achieved by providing an adjustment mechanism for changing the sub-base to an arbitrary angle with respect to the base.

  According to such a configuration, the sub base can be arranged at a position that does not interfere with the cutting operation without removing the sub base from the main base, and workability can be improved.

  The sub-base includes a sub-base main body having the sub-base bottom surface, and a guide bar extending from the sub-base main body, the guide bar being connected to the main base; A second guide bar coupled to the first sub-base and the sub-base main body, and the adjustment mechanism includes a rotation pin that rotatably supports the second guide bar with respect to the first guide bar; A plurality of grooves provided in one of the first guide bar and the second guide bar; and an engaging member provided in the other of the first guide bar and the second guide bar and engaged with the groove. It is preferable that the angle of the sub base with respect to the main base can be changed by rotating the second guide bar.

  According to such a configuration, if the second guide bar is rotated, the position of the sub-base body can be changed, so that the cutting operation can be easily performed.

  The plurality of groove portions include a first position where at least a bottom surface of the sub-base is on an extension line of the bottom surface of the main base, and a first position where the bottom surface of the sub-base is perpendicular to the bottom surface of the main base. It is preferable that the second position can be changed.

  According to such a configuration, it is possible to easily set sub-bases at a plurality of positions according to the work content.

  The second position is preferably a state in which the second guide bar is rotated toward the main body with respect to the first guide bar.

  According to such a configuration, the sub-base can be arranged so as not to get in the way during the cutting operation.

  In the second position, it is preferable that the bottom surface of the sub-base body is located on an extension line of an intersection line between the saw blade and the workpiece.

  According to such a configuration, since the bottom surface of the sub base can be brought into contact with the wall or the like during the cutting operation, the sub base can be used as a guide during the cutting operation. Furthermore, even when there are irregularities on the wall or the like, it is possible to prevent the main base and the like from being caught by the irregularities because the bottom surface guides.

  The second position is preferably a state in which the second guide bar is rotated to the opposite side of the main body with respect to the first guide bar.

  According to such a configuration, it is possible to guide by the sub-base without providing a separate guide member at the time of normal cutting, and it is possible to perform stable cutting work particularly in the case of linear cutting.

  Further, it is preferable that the rotation of the second guide bar with respect to the first guide bar is restricted by the engagement member engaging with one of the plurality of grooves.

  According to such a structure, since the 2nd guide bar can be fixed to a desired position, it can control that the position of the 2nd guide bar moves unexpectedly, and can perform a stable cutting operation.

  The second guide bar may be horizontally movable in the longitudinal direction with respect to the first guide bar.

  According to such a configuration, the workpiece can be cut into an arbitrary width.

  According to the present invention, the cutting operation can be performed without removing the sub base from the main base, and workability can be improved. Moreover, since the position of the sub base with respect to the main base can be changed according to the work application, various cutting operations can be performed stably.

1 shows a base part of a portable cutting machine according to the present invention. FIG. 2 is a partial cross-sectional view taken along line AA of FIG. 1 and shows a first state of the sub-base according to the present invention. FIG. 3 shows a sub-base according to the present invention, which is moved from the state of FIG. FIG. 3 shows a sub-base according to the present invention rotated from the state of FIG. 2 shows a reverse tilt state of a portable cutting machine according to the present invention. FIG. 5 shows a sub-base according to the present invention rotated from the state of FIG. 2 in the direction opposite to that of FIG. It is a conventional portable cutting machine. This is a sub-base of a conventional portable cutting machine.

  A portable circular saw (hereinafter referred to as a circular saw) which is a portable cutting machine of the present invention will be described with reference to FIGS. Since the overall configuration of the circular saw is the same as the conventional configuration shown in FIG. 7, the description thereof will be omitted, and the configuration of the base portion that characterizes the present invention will be described in detail.

  As shown in FIG. 1, the base portion 1 includes a main base 2 and a sub base 3. A pair of guide bars 4 are fixed to the sub-base 3 so as to extend in the direction perpendicular to the longitudinal direction near both ends in the longitudinal direction of the sub-base body 5 by welding or the like. It is not necessary to provide a pair of guide bars 4, and only one of them may be provided.

  The main base 2 includes an insertion portion 10 formed with an insertion hole 10a provided on the upper surface of the base for inserting the guide bar 4, and a second guide bar 7 to be described later. The main base 2 (first guide bar 6) For this, a fixed shaft 14 for fixing an arbitrary position, that is, a position from the side surface 2a of the main base 2 is provided.

  The fixed shaft 14 is supported by a receiving portion 16 formed on the main base 2, and is screwed into a screw hole 13 formed in a guide portion 12 provided so that a tip thereof protrudes upward from the main base 2. It is provided as follows. The fixed shaft 14 is passed through a through hole 15 formed in the first guide bar 6 described later, and the tip of the fixed shaft 14 is screwed into the screw hole 13 via a washer 17 provided coaxially with the fixed shaft 14. By tightening, the movement of the sub base 3 relative to the main base 2 (up and down direction in FIG. 1) is restricted. That is, the movement of the sub base 3 in the horizontal direction (vertical direction in FIG. 1) can be restricted, and the distance of the sub base 3 from the end surface 2a of the main base 2 can be adjusted. The main base 2 and the sub base 3 form a base opening 18 into which the saw blade 106 is inserted.

  The guide bar 4 has a plate shape, and the insertion hole 10a has a through hole corresponding to the plate shape. Therefore, even when the guide bar 4 has only one, the sub base 3 is located with respect to the main base 2. Rotation can be suppressed.

  The configuration of the sub base 3 will be described with reference to FIGS. As described above, the sub base 3 includes the sub base main body 5 and the guide bar 4. The guide bar 4 includes a first guide bar 6 connected to the main base 2 and a second guide bar 7 connected to the first guide bar 6 so as to sandwich the first guide bar 6. As shown in FIG. 1, the second guide bar 7 has a U-shaped cross section so as to sandwich both sides of the first guide bar 6 in the thickness direction. The sub base body 5 is fixed. On the side opposite to the main base of the sub-base body 5, a tip portion 5a bent upward is formed. A hinge portion is formed by providing a rotation pin 8 so as to penetrate through the first and second guide bars 6 and 7. The sub-base body 5 and the second guide bar 7 are connected by the first guide bar 6 and the rotation pin 8 so as to be integrally rotatable around the rotation pin 8 of the hinge portion. The lock pin 9 serving as an engaging member provided in the second guide bar 7 is engaged with any one of the fixing grooves 19a to 19c serving as a plurality of grooves provided in the hinge portion of the first guide bar 6 every 90 degrees. It is the composition to do.

  The first guide bar 6 has a long hole 15 through which the fixed shaft 14 passes. The fixed shaft 14 is provided on the main base 2, and by moving the sub base 3 horizontally along the long hole 15, it can move in a direction in which the sub base 3 is separated from or approaching the end surface 2a of the main base 2, The position of the sub base 3 with respect to the main base 2 can be adjusted. Here, the rotation pin 8, the lock pin 9, and the fixing grooves 19a to 19c constitute an adjustment mechanism.

  FIG. 2 shows a state in which the sub base 3 is retracted with respect to the main base 2, that is, a state in which the sub base 3 (sub base main body 5) is closest to the main base 2 side. FIG. 3 shows a state in which the sub base 3 is horizontally moved with respect to the main base 2, that is, a state in which the end surface 5a of the sub base 3 is separated from the end surface 2a of the main base 2 by a predetermined distance.

  2 and 3, the lock pin 9 provided integrally with the second guide bar 7 is engaged with the fixing groove 19b of the hinge portion, and the bottom surface of the main base 2 and the sub base 3 (sub The bottom surface of the base body 5) is horizontal. According to this state, a large contact area between the workpiece and the base portion 1 (the bottom surface of the main base 2 and the sub-base main body 5) can be secured, so that stable cutting work can be performed. Further, the front end portion 5 a of the sub base body 5 is bent upward, and the bottom surface thereof is perpendicular to the bottom surface of the sub base body 5. Therefore, if the distance between the base end surfaces 2a and 5b (between the bottom surface of the tip portion and the saw blade 106) is fixed to a desired length, the cutting operation can be performed while the bottom surface of the tip portion 5a is in contact with a wall or the like. Straight line cutting can be easily performed. 2 and 3, the circular saw shown in FIG. 7 shows the positional relationship in which the saw blade 106 is perpendicular to the bottom surface of the base, or the direction in which the motor housing 103 is separated from the main base 108 (the reverse direction to FIG. 5 described later). ) In the state where the main body 101 is inclined. Therefore, the cutting operation can be performed stably at the time of right-angle cutting or tilting.

  On the other hand, in the case of a cutting operation in a so-called reverse inclined state where the circular saw is cut off, that is, in the circular saw shown in FIG. 7, the main body portion 10 is inclined in a direction approaching the main base 108. 4 and 5, the sub-base body 5 (second guide bar 7) is rotated by a predetermined angle, specifically 90 degrees, with respect to the main base 2 (first guide bar 6). .

  As shown in FIG. 4, the sub base 3 (sub base main body 5) can be rotated by the rotation pin 8 so that the bottom surface 5 c thereof is perpendicular to the bottom surface of the main base 2. At this time, the lock pin 9 is engaged with the fixing groove 19a of the hinge portion, so that the sub base body 5 is rotated upward (the bottom surface 5c of the sub base body 5 and the bottom surface 2b of the main base 2 are vertical). It can be fixed with.

  As shown in FIG. 5, the main body 101 of the circular saw is tilted to the right side in the drawing around the rotation shaft 113. At this time, the portion of the saw blade 106 that protrudes downward from the bottom surface 2 b of the main base 2 is located on the outer side (left side in the drawing) from the bottom surface 5 c of the sub-base body 5. The line of intersection between the bottom surface 5c of the sub base body 5 and the bottom surface 2b of the main base 2 is the position of the line of intersection between the saw blade 106 and the workpiece, and the bottom surface 5c of the sub base body 5 is on the upper extension line of the line of intersection. To position. In FIG. 5, reference numeral 114 denotes a rotating shaft (spindle) that transmits the rotation of the motor to the saw blade 106, and 115 denotes a protective cover that covers the saw blade 106 positioned below the base portion 1 and contacts the workpiece. As a result, it rotates in the saw cover 107 around the rotation axis.

  Therefore, if the bottom surface 5c of the sub-base body 5 is brought into contact with a wall or the like, cutting work at the wall side becomes possible. Further, since the bottom surface 5c can be used as a guide member, a stable cutting operation can be performed even during the cutting operation. Furthermore, even when there are protrusions on the wall or the like, the circular saw body or the base portion can be prevented from being caught by the protrusions by the bottom surface 5c.

  As described above, according to the present invention, it is not necessary to remove the sub base 3 from the main base 2 each time when performing the cutting operation, so that workability can be improved. Further, since the bottom surface 5a comes into contact with the wall or the like with the sub base body 5 rotated by 90 degrees, the cutting operation can be performed without being caught by the round saw body or the base portion 1 even when the wall or the like is uneven. . Moreover, since a knob for attaching the sub-base to the main base is not required as in the prior art, the total length of the base portion 1 (the length in the left-right direction in FIG. 1) can be reduced accordingly. In particular, as in the present embodiment, if the guide bar 4 is plate-shaped and the thicker one is arranged in the vertical direction (FIG. 1 and the like), further effects can be obtained.

  Further, as shown in FIG. 6, the sub-base body 5 (second guide bar 7) can be rotated around the rotation pin 8 in the direction opposite to that in FIG. In this case, since the lock pin 9 is engaged with the fixing groove 19c of the hinge portion, the sub-base body 5 and the second guide bar 7 can be fixed to the bottom surface 2b of the main base 2 at a downward vertical position. . Accordingly, the bottom surface 5c of the sub-base body 5 folded downward can be brought into contact with the side surface of the workpiece without attaching a separate guide member, so that a linear cutting operation can be performed. Further, by loosening the fixed shaft 14 provided on the main base 2 and releasing the pressure (tightening) on the first guide bar 6 of the washer 17, the sub base 3 is perpendicular to the side surface of the saw blade 106 (main The cutting width of the workpiece can be arbitrarily changed by sliding the base 2 in the horizontal direction with the bottom surface 2b of the base 2.

  In the present embodiment, the first guide bar 6 is provided with the fixing grooves 19a to 19c, and the second guide bar 7 is provided with the lock pin 9, but the first guide bar 6 is provided with the lock pin 9 and the second guide bar 7 is provided with the fixing groove. The structure provided with 19a-19c may be sufficient.

1 is a base portion, 2 is a main base, 3 is a sub base, 4 is a guide bar, 5 is a sub base body, 6 is a first guide bar, 7 is a second guide bar, 8 is a rotation pin, 9 is a lock pin, 10 is an insertion part, 15 is a long hole, 19a-19b is a fixing groove.

Claims (8)

A main body having a motor housing that houses a motor, a saw blade that is rotationally driven by the motor, a saw cover that covers a part of the outer periphery of the saw blade, and a base that is connected to the main body and slides on a workpiece. In a portable cutting machine equipped with
The base portion includes a main base coupled to the main body portion, and a sub base provided movably with respect to the main base,
A portable cutting machine comprising an adjusting mechanism for changing the sub base to an arbitrary angle with respect to the main base. The sub-base includes a sub-base main body having the sub-base bottom surface, and a guide bar extending from the sub-base main body,
The guide bar includes a first guide bar connected to the main base, and a second guide bar connected to the first sub base and the sub base body.
The adjustment mechanism is
A rotating pin that rotatably supports the second guide bar with respect to the first guide bar;
A plurality of grooves provided on one of the first guide bar and the second guide bar;
An engagement member provided on the other of the first guide bar and the second guide bar and engaged with the groove portion;
The portable cutting machine according to claim 1, wherein an angle of the sub base with respect to the main base can be changed by rotating the second guide bar.   The plurality of groove portions include a first position where at least a bottom surface of the sub-base is on an extension line of the bottom surface of the main base, and a second position where the bottom surface of the sub-base is perpendicular to the bottom surface of the main base. The portable cutting machine according to claim 2, wherein the portable cutting machine is provided so that the position can be changed.   The portable cutting machine according to claim 3, wherein the second position is a state in which the second guide bar is rotated toward the main body with respect to the first guide bar.   5. The portable cutting machine according to claim 4, wherein, in the second position, the bottom surface of the sub-base body is positioned on an extension line of an intersection line between the saw blade and the workpiece.   6. The portable device according to claim 4, wherein the second position is a state in which the second guide bar is rotated to the opposite side of the main body with respect to the first guide bar. Cutting machine.   7. The rotation of the second guide bar relative to the first guide bar is restricted by the engagement member engaging with one of the plurality of grooves. 8. Portable cutting machine.   The portable cutting machine according to any one of claims 2 to 7, wherein the second guide bar is horizontally movable in the longitudinal direction with respect to the first guide bar.