WO2017187894A1

WO2017187894A1 - Portable cutting machine

Info

Publication number: WO2017187894A1
Application number: PCT/JP2017/013672
Authority: WO
Inventors: 慎治倉賀野
Original assignee: 日立工機株式会社
Priority date: 2016-04-28
Filing date: 2017-03-31
Publication date: 2017-11-02
Also published as: JPWO2017187894A1; JP6614338B2

Abstract

Provided is a portable cutting machine that increases the amount that a main body rotates with respect to a base without a tilting mechanism being enlarged or increased in weight. A circular saw in which a base and a main body that comprises a rotating blade are connected so as to be capable of relative rotation. The circular saw has: a connection member 21 that connects the base and the main body such that the base and the main body are capable of relative rotation; a bevel stand 30 that is provided to the base; a first long hole 31 that is provided in the bevel stand 30; a bevel plate 40 that is provided to the main body; a second long hole 41 that is provided in the bevel plate 40 and that communicates with the first long hole 31; and a through member 50 that passes through the first long hole 31 and the second long hole 41 and that moves along the first long hole 31 in association with the rotation of the main body. The second long hole 41 extends in a direction that allows the through member 50 to move toward the connection member 21 when the former has reached one end of the first long hole 31. The second long hole 41 extends in a direction that intersects a straight line that connects the center of the connection member 21 and the center of the through member 50.

Description

Portable cutting machine

The present invention relates to a portable cutting machine, and more particularly to a mechanism for tilting a cutting blade.

A general portable cutting machine has a main body including a driving source and a rotary blade (saw blade) that is rotationally driven by the driving source, and a base. A slit is provided in the base, and a part of the rotary blade protrudes below the base through the slit. Therefore, when the base is placed on the material to be cut and the main body is moved so that the base bottom surface slides on the surface of the material to be cut, the material to be cut is cut by a part of the rotary blade protruding below the base. .

Further, the main body and the base are connected so as to be relatively rotatable so that the rotary blade is inclined with respect to the base. When the main body is rotated with respect to the base, the rotary blade tilts with respect to the base. Specifically, the angle of the rotary blade with respect to the bottom surface of the base sliding on the surface of the material to be cut changes within a predetermined angle range. When the rotary blade is inclined with respect to the bottom surface of the base, an oblique cut (sometimes referred to as “inclined cut”) in which the cut surface is inclined with respect to the surface of the workpiece is realized.

In order to realize the tilting of the rotary blade as described above, the portable cutting machine is provided with a tilting mechanism. The tilt mechanism has a connecting member that connects the main body and the base so as to be relatively rotatable, and the main body rotates relative to the base with the connecting member as a rotation center. Further, the tilt mechanism includes a plate erected on the upper surface of the base, an arc-shaped long hole formed in the plate, and a bolt inserted into the long hole. When the main body is rotated with respect to the base after loosening the bolt connection, the bolt moves along the long hole inside the long hole. That is, the rotation range of the main body is regulated by the movement range of the bolt inside the elongated hole. In other words, the rotation amount of the main body (= the inclination angle of the rotary blade) is regulated by the length of the long hole.

Japanese Patent Laid-Open No. 2002-264101

In order to further improve the convenience of the portable cutting machine, it is required to increase the inclination angle of the rotary blade. Since the inclination angle of the rotary blade depends on the rotation amount of the main body with respect to the base, it is necessary to increase the rotation amount of the main body with respect to the base in order to increase the inclination angle of the rotary blade. Furthermore, since the amount of rotation of the main body with respect to the base is defined by the length of the long hole of the tilting mechanism, it is necessary to extend the long hole in order to increase the amount of rotation of the main body. However, in order to extend the elongated hole, it is necessary to enlarge the plate on which the elongated hole is provided, leading to an increase in the size and weight of the tilting mechanism.

An object of the present invention is to increase the amount of rotation of the main body relative to the base while avoiding an increase in the size and weight of the tilting mechanism.

In one aspect of the present invention, the portable cutting machine includes a connecting member that connects the main body and the base in a relatively rotatable manner, a first plate provided on the base, and a first length provided on the first plate. A hole, a second plate provided in the main body, a second slot provided in the second plate and communicating with the first slot, and passing through the first slot and the second slot. And a penetrating member that moves along the first elongated hole as the main body rotates. The second elongated hole is an elongated hole extending in a direction allowing the penetrating member that has reached one end of the first elongated hole to move in a direction approaching the connecting member, The two long holes extend in a direction intersecting with a straight line connecting the center of the connecting member and the center of the penetrating member.

In another aspect of the present invention, the portable cutting machine includes a connecting member that connects the main body and the base so as to be relatively rotatable, a first plate provided on the base, and a first plate provided on the first plate. A long hole, a second plate provided in the main body, a second long hole provided in the second plate and communicating with the first long hole, and passing through the first long hole and the second long hole And a penetrating member. The first elongated hole and the second elongated hole extend in mutually different directions, and the penetrating member moves along the first elongated hole inside the first elongated hole as the main body rotates. It moves along the hole and moves along the second long hole inside the second long hole.

ADVANTAGE OF THE INVENTION According to this invention, the rotation amount of the main body with respect to a base can be increased, avoiding the enlargement and weight increase of a tilting mechanism.

It is a perspective view of a circular saw. It is a front view of a circular saw when the inclination angle of a rotary blade is 0 degree. It is a front view of a circular saw when the inclination angle of a rotary blade is 45 degrees. It is a front view of a circular saw when the inclination angle of a rotary blade is 55 degrees. It is a disassembled perspective view of a tilting mechanism. It is an enlarged front view of a tilting mechanism. (A) is a front view of a tilting mechanism when the tilt angle of the rotary blade is 0 degree, (b) is a front view of the tilt mechanism when the tilt angle of the rotary blade is 30 degrees, and (c) is a tilt of the rotary blade. The front view of the tilting mechanism when the angle is 45 degrees, (d) is a front view of the tilting mechanism when the tilt angle of the rotary blade is 55 degrees. It is a disassembled perspective view of another tilting mechanism. (A) is a front view of another tilting mechanism when the tilt angle of the rotary blade is 0 degrees, (b) is a front view of another tilt mechanism when the tilt angle of the rotary blade is 30 degrees, and (c) is a front view of the tilt mechanism. FIG. 6D is a front view of another tilting mechanism when the tilt angle of the rotary blade is 45 degrees, and FIG. 6D is a front view of another tilt mechanism when the tilt angle of the rotary blade is 55 degrees. (A) is an enlarged front view of another tilting mechanism, which is an enlarged front view when the tilt angle of the rotary blade is 0 degree, and (b) is an enlarged front view of the other tilting mechanism, and is rotated. It is an enlarged front view when the inclination angle of the blade is 55 degrees.

(Embodiment 1) Hereinafter, an example of embodiment of the portable cutting machine of this invention is demonstrated. The portable cutting machine according to this embodiment includes a disk-shaped rotary blade, and is generally called “a circular saw”. Therefore, in the following description, the portable cutting machine according to this embodiment is referred to as a “circular saw”.

As shown in FIGS. 1 and 2, the circular saw 1 according to the present embodiment includes a main body 2 and a base 3 that are connected so as to be relatively rotatable. The main body 2 includes a rotary blade 4 that is rotationally driven, and a housing 5 that holds the rotary blade 4 rotatably. The housing 5 includes a motor case 6 in which a motor that is a driving source of the rotary blade 4 is accommodated, a gear case 7 in which a reduction mechanism that decelerates rotation of the motor is accommodated, and a saw cover that covers a part of the rotary blade 4. 8, a safety cover 9 that covers the other part of the rotary blade 4, and a handle 10, and the rotary blade 4 is attached to the end of the drive shaft (output shaft of the speed reduction mechanism) protruding from the gear case 7. It is attached. The handle 10 is provided at a position where the weight balance between the front, rear, left and right of the handle 10 is as uniform as possible. In the present embodiment, the gear case 7 is disposed under the handle 10, the rotary blade 4, the saw cover 8 and the safety cover 9 are disposed on one side of the gear case 7, and the motor case 6 is disposed on the other side of the gear case 7. Has been.

An opening 11 is provided in the base 3, and a part of the rotary blade 4 protrudes below the base 3 through the opening 11. The safety cover 9 covers substantially half (lower half) of the rotary blade 4 including a part of the rotary blade 4 protruding downward from the base 3 through the opening 11, and the saw cover 8 is covered by the safety cover 9. It covers substantially half (the upper half) of the rotating blade 4 that is not present. That is, the saw cover 8 and the safety cover 9 cover substantially the entire rotary blade 4 (substantially the entire circumference). However, the safety cover 9 is rotatable with respect to the saw cover 8, and a spring is interposed between the saw cover 8 and the safety cover 9. When the safety cover 9 is rotated against the bias of the spring, a part of the rotary blade 4 is exposed according to the amount of rotation.

The motor case 6 includes a fan that is rotationally driven by a motor. The motor case 6 is formed with a plurality of wind windows 6a. When the fan is rotationally driven by the motor, outside air is introduced into the motor case 6 through the wind window 6a, and the motor, circuit board, and the like are cooled by the introduced outside air.

Inside the handle 10, a trigger switch for controlling the operation of the motor and a stopper for holding the trigger switch in an ON state are provided. When the trigger switch is turned on, the motor operates and the rotary blade 4 and the fan are driven to rotate.

As described above, the main body 2 and the base 3 are connected so as to be relatively rotatable. As shown in FIGS. 3 and 4, when the main body 2 is rotated with respect to the base 3, the rotary blade 4 tilts with respect to the base 3. Specifically, the angle of the rotary blade 4 with respect to the base bottom surface 3a sliding on the surface of the material to be cut changes. When the rotary blade 4 is inclined with respect to the base bottom surface 3a in this way, an oblique cut (sometimes referred to as an “inclined cut”) in which the cut surface is inclined with respect to the surface of the material to be cut is realized.

In order to realize the tilting of the rotary blade 4 as described above, the circular saw 1 is provided with a tilting mechanism 20. The tilting mechanism 20 includes a pin-shaped connecting member 21, and the connecting member 21 connects the main body 2 and the base 3 so as to be relatively rotatable. Hereinafter, the details of the tilting mechanism 20 will be described mainly with reference to FIG. The tilt mechanism 20 includes a first plate 30 provided in the base 3 (FIG. 1 and the like), a first long hole 31 provided in the first plate 30, and a second plate provided in the main body 2 (FIG. 1 and the like). The plate 40 and the second long hole 41 provided in the second plate 40 and communicating with the first long hole 31 are provided. In the following description, the first plate 30 provided on the base 3 is referred to as “bevel stand 30”, and the second plate 40 provided on the main body 2 is referred to as “bevel plate 40”.

The bevel stand 30 and the bevel plate 40 are disposed adjacent to each other in the front-rear direction, and the bevel plate 40 is located behind the bevel stand 30. 5 is an exploded view, the illustrated bevel stand 30 and bevel plate 40 are separated from each other. However, the actual bevel stand 30 and the bevel plate 40 face each other with almost no gap. The bevel stand 30 and the bevel plate 40 are provided with through

holes

30a and 40a communicating with each other. The connecting member 21 shown in FIG. 1 and the like is inserted into the through

holes

30 a and 40 a and penetrates the bevel stand 30 and the bevel plate 40. Therefore, as shown in FIGS. 2 to 4, the bevel plate 40 and the main body 2 provided with the bevel plate 40 are connected to the bevel stand 30 and the base 3 provided with the connecting member 21 at the rotation center (rotation shaft). ). In the following description, the center of the connecting member 21 may be referred to as “rotation center” or “fulcrum”.

As shown in FIG. 6, the first long hole 31 provided in the bevel stand 30 has an arc shape. Specifically, the first elongated hole 31 is an arc-shaped elongated hole extending along the circumference of a circle centered on the center of the connecting member 21 that is the rotation center (fulcrum). On the other hand, the second long hole 41 provided in the bevel plate 40 is a straight long hole. The first elongated hole 31 and the second elongated hole 41 are in communication with each other, and a penetrating member 50 is inserted into the first elongated hole 31 and the second elongated hole 41.

Refer to FIG. 5 again. The penetrating member 50 is provided between the shaft portion 51 having a screw formed on the outer peripheral surface, the disc-shaped head portion 52 provided at the proximal end of the shaft portion 51, and the shaft portion 51 and the head portion 52. And an engaging portion 53 having a prismatic shape (in this embodiment, a hexagonal prism shape). The diameter of the head 52 is larger than the width of the second slot 41 and cannot pass through the second slot 41. On the other hand, the diameter of the shaft portion 51 is smaller than the widths of the second elongated hole 41 and the first elongated hole 31, and the shaft portion 51 penetrates the second elongated hole 41 and the first elongated hole 31 in this order. The tip of the shaft 51 passing through the second elongated hole 41 and the first elongated hole 31 protrudes forward of the bevel stand 30 and is screwed to a lever 60 disposed in front of the bevel stand 30. Specifically, a nut 61 is embedded in the lever 60, and the nut 61 is fixed to the lever 60 with a screw 62. The tip of the shaft portion 51 is screwed to a nut 61 embedded in the lever 60 through a washer 63.

As shown in FIGS. 7A to 7D, the penetrating member 50 in which the shaft portion 51 passes through the first long hole 31 and the second long hole 41 is as shown in FIGS. As the main body 2 rotates, the inside of the first long hole 31 moves along the first long hole 31. Specifically, the penetrating member 50 moves from the first end (lower end 31a) to the second end (upper end 31b) of the first elongated hole 31 shown in FIG. It moves from the 2nd end part (upper end 31b) of 31 to the 1st end part (lower end 31a). When the penetrating member 50 is positioned at the lower end 31a of the first elongated hole 31 (FIG. 7A), the rotary blade 4 is perpendicular to the base bottom surface 3a (FIG. 2). In the present embodiment, the inclination angle of the rotary blade 4 with respect to the base bottom surface 3a is defined with the state where the rotary blade 4 is perpendicular to the base bottom surface 3a as a reference (0 degree). That is, the inclination angle of the rotary blade 4 with respect to the base bottom surface 3a is defined with reference to the state shown in FIG.

Accordingly, when the main body 2 is rotated so that the penetrating member 50 moves in the order shown in FIGS. 7A, 7 B, and 7 C, that is, the penetrating member 50 moves from the lower end 31 a of the first long hole 31. When the main body 2 is rotated so as to move toward the upper end 31b, the inclination angle of the rotary blade 4 gradually increases. As shown in FIG. 7C, when the penetrating member 50 reaches the upper end 31 b of the first long hole 31, the inclination angle of the rotary blade 4 becomes 45 degrees. On the other hand, when the main body 2 is rotated so that the penetrating member 50 moves in the order shown in FIGS. 7C, 7 B, and 7 A, that is, the penetrating member 50 moves from the upper end 31 b of the first long hole 31. When the main body 2 is rotated so as to move toward the lower end 31a, the inclination angle of the rotary blade 4 gradually decreases. As shown in FIG. 7A, when the penetrating member 50 reaches the lower end 31 a of the first long hole 31, the inclination angle of the rotary blade 4 becomes 0 degree. As shown in FIG. 6, a scale indicating the inclination angle of the rotary blade 4 is displayed on the outer frame of the bevel stand 30, and an arrow is provided on the bevel plate 40 so as to be adjacent thereto. The current inclination angle of the rotary blade 4 can be known by reading the scale indicated by the arrow provided on the bevel plate 40 that rotates together with the main body 2.

The straight second elongated hole 41 is a rectangular square hole extending in a direction intersecting with the straight line X connecting the center of the connecting member 21 and the center of the penetrating member 50. In other words, the center line Y of the second elongated hole 41 is not parallel to the straight line X and intersects the straight line X at the center of the penetrating member 50. Here, the straight line X corresponds to the radius of a circle centered on the center of the connecting member 21 that is the rotation center of the main body 2. The center line Y corresponds to the radius of a circle centered on a point different from the rotation center of the main body 2. Furthermore, the center line Y of the second long hole 41 is a straight line that passes through the midpoint of the two short sides of the second long hole 41 and bisects the second long hole 41.

On the other hand, the bevel stand 30 is provided with an adjustment hole 32 continuous with the upper end of the first elongated hole 31. The adjustment hole 32 extends from the upper end 31 b of the first elongated hole 31 toward the rotation center of the main body 2. In other words, the adjustment hole 32 extends in the radial direction of the circle that defines the first elongated hole 31.

As shown in FIGS. 7A to 7C, the penetrating member 50 moves between the lower end 31a and the upper end 31b of the first elongated hole 31 as the main body 2 rotates. As shown in FIGS. 7A and 7B, the penetrating member 50 that moves between the lower end 31 a and the upper end 31 b of the first elongated hole 31 is not in a predetermined direction due to the inner surface of the first elongated hole 31 during that time. Movement in the direction of is restricted. Specifically, the movement of the first long hole 31 in a direction other than the extending direction is restricted. Therefore, while the penetrating member 50 moves between the lower end 31a and the upper end 31b of the first elongated hole 31, the penetrating member 50 moves in the extending direction of the second elongated hole 41 (straight line Y direction shown in FIG. 6). There is nothing. In other words, the penetrating member 50 is always located at one end (the upper end 41b) of the second long hole 41, and therefore the distance between the penetrating member 50 and the connecting member 21 does not change. That is, the distance between the penetrating member 50 and the rotation center (fulcrum) of the main body 2 does not change.

However, as shown in FIG. 7C, when the penetrating member 50 reaches the upper end 31 b of the first long hole 31, the movement restriction by the inner surface of the first long hole 31 is released. As a result, the penetrating member 50 can move with respect to the second long hole 41. In other words, the penetrating member 50 that has reached the upper end 31b of the first elongated hole 31 can move from one end (upper end 41b) of the second elongated hole 41 toward the other end (lower end 41a). Furthermore, in other words, the penetrating member 50 can move in the extending direction of the second long hole 41 and at the same time can move in the extending direction of the adjustment hole 32. That is, the second long hole 41 allows the penetrating member 50 that has reached the upper end 31 b of the first long hole 31 to move in the direction of approaching the connecting member 21. Therefore, as shown in FIGS. 7C to 7D, when the penetrating member 50 is moved along the second elongated hole 41 and the adjusting hole 32, that is, the penetrating member 50 is rotated at the center of rotation (fulcrum) of the main body 2. When the main body 2 is moved closer to the center of the connecting member 21, the main body 2 further rotates with respect to the base 3. In other words, when the main body 2 is rotated with respect to the base 3 in order to further tilt the rotary blade 4 from the state of FIG. 7C, the penetrating member 50 extends along the second long hole 41 and the adjustment hole 32. Move.

In the state shown in FIG. 7C, that is, in a state in which the penetrating member 50 can move in both the second elongated hole 41 and the adjustment hole 32, the two extending from the position (starting point) before the penetrating member 50 is moved. Since the directions of the holes (the second elongated hole 41 and the adjustment hole 32) are different from each other, when the penetrating member 50 is moved along the second elongated hole 41, the penetrating member 50 is connected to the second elongated hole 41 and the adjusting hole 32. This is because the bevel plate 40 rotates so as to maintain the state of penetrating through. Accordingly, in the state of FIG. 7C, one end of the second elongated hole 41 and the adjustment hole 32 is located at a position (starting point) before the penetrating member 50 is moved, and in the state of FIG. The other end of the adjustment hole 32 is located at a post-movement point (end point) of the penetrating member 50. At this time, the direction in which the main body 2 is rotated around the fulcrum (the connecting member 21), and the inclination direction of the second elongated hole 41 that is inclined with respect to the adjustment hole 32 extending from the penetrating member 50 (FIG. 7C) before the movement. Must be in the same direction. That is, in the state of FIG. 7C, the second elongated hole 41 is counter-rotated around the penetrating member 50 with respect to the adjustment hole 32 in order to rotate the bevel plate 40 counterclockwise around the connecting member 21. Tilt clockwise.

In FIGS. 7A to 7D, the main body 2 and the base 3 are not shown for convenience of drawing.

The penetration member 50 (FIG. 7 (d)) located at the lower end 41a of the second elongated hole 41 from the center of the penetration member 50 (FIG. 7 (c)) located at the upper end 41b of the second elongated hole 41. The distance to the center is 10 mm. That is, the penetrating member 50 that has reached the upper end 31b of the first elongated hole 31 can move 10 mm in the direction approaching the rotation center (fulcrum) therefrom. As a result, the main body 2 is further 10 degrees with respect to the base 3. Rotate. Since the angle of inclination of the rotary blade 4 when the penetrating member 50 is positioned at the upper end 31b of the first elongated hole 31 is 45 degrees, the rotary blade 4 is inclined at a maximum of 55 degrees with respect to the base bottom surface 3a. That is, the tilt angle range of the rotary blade 4 is 0 to 55 degrees. 3 is a front view of the circular saw 1 when the inclination angle of the rotary blade 4 is 45 degrees, and FIG. 4 is a front view of the circular saw 1 when the inclination angle of the rotary blade 4 is 55 degrees. FIG. In other words, when the main body 2 and the base 3 are in the positional relationship shown in FIG. 3, the penetrating member 50 is in the position shown in FIG. Further, when the main body 2 and the base 3 are in the positional relationship shown in FIG. 4, the penetrating member 50 is in the position shown in FIG. 7 (d).

But if the adjustment hole 32 is extended and the movable distance of the penetration member 50 is extended, the maximum inclination angle of the rotary blade 4 can be made larger than 55 degree | times. At this time, if the adjustment hole 32 is illuminated, the bevel stand 30 does not expand even if the adjustment hole 32 is extended, and at least the bevel stand 30 expands in the extension direction of the first elongated hole 31. There is no.

As described above, the main body 2 can be further rotated by +10 degrees by moving the penetrating member 50 that has reached the upper end 31 b of the first long hole 31 in a direction close to the rotation center (fulcrum) of the main body 2. . That is, the inclination angle is changed (in conjunction with) the change in the distance between the penetrating member 50 and the connecting member 21. At this time, the penetrating member 50 moves in the extending direction with respect to the adjustment hole 32 and the second elongated hole 41, but the moving direction of the penetrating member 50 with respect to the adjusting hole 32 and the moving direction with respect to the second elongated hole 41 are Is different.

As described above, in the circular saw 1 according to the present embodiment, after the main body 2 is rotated by 45 degrees with respect to the base 3 (FIG. 3), the penetrating member 50 is made to extend in the extending direction of the first long hole 31. The main body 2 can be rotated up to 55 degrees by moving it in different directions (FIG. 4). Therefore, it is not necessary to extend the first elongated hole 31 in order to increase the amount of rotation of the main body 2, and it is not necessary to enlarge the bevel stand 30 provided with the first elongated hole 31. That is, the amount of rotation of the main body 2 relative to the base 3 (= the inclination angle of the rotary blade 4) can be increased while avoiding an increase in the size and weight of the tilt mechanism 20.

The circular saw 1 is often used in a state where the inclination angle of the rotary blade 4 is 0 degree or 45 degrees. Therefore, when the main body 2 is rotated 45 degrees with respect to the base 3, that is, when the inclination angle of the rotary blade 4 becomes 45 degrees, the penetrating member 50 hits the upper end 31 b of the first long hole 31 and the main body 2 rotates. Is temporarily stopped. That is, the circular saw 1 has an auto-stop function that automatically stops the rotation of the main body 2 when the inclination angle of the rotary blade 4 reaches 45 degrees.

Here, if the first long hole 31 shown in FIG. 6 or the like is extended, the adjustment hole 32 or the penetrating member 50 may not be moved in the direction close to the rotation center (fulcrum). The amount of rotation of the main body 2 (= the inclination angle of the rotary blade 4) can be made larger than 45 degrees. However, as shown in FIG. 6, a duct 70 that forms an air passage is provided in the vicinity of the bevel stand 30. The duct 70 extends between the main body 2 shown in FIG. 1 and the like and a blow-off port 71 provided in the vicinity of the rotary blade 4 (the tip of the saw cover 8 in this embodiment), and is incorporated in the main body 2. The air flow generated by the rotation of the fan is guided to the outlet 71. That is, when the motor is operated, both the rotary blade 4 and the fan are driven to rotate, the workpiece is cut by the rotary blade 4, and the wind blows out from the outlet 71. Therefore, wood chips and the like generated in association with the cutting of the material to be cut are blown away by the wind blown from the blowout port 71. That is, the duct 70 and the outlet 71 constitute a blower.

The duct 70 shown in FIG. 6 is provided at the tip of the upper end 31b of the first elongated hole 31, and crosses the extending direction of the first elongated hole 31, and the main body 2 shown in FIG. It extends between the mouth 71 (saw cover 8). Therefore, if the bevel stand 30 is expanded in the extending direction of the first long hole 31 in order to extend the first long hole 31, the bevel stand 30 and the duct 70 may interfere with each other. In this regard, in the present embodiment, by allowing the penetrating member 50 that has reached the upper end 31b of the first long hole 31 to move in a direction close to the rotation center (fulcrum) of the main body 2, the rotation amount of the main body 2 (= The inclination angle of the rotary blade 4) is made larger than 45 degrees. That is, the rotation amount of the main body 2 is increased without extending the first long hole 31, and interference between the bevel stand 30 and the duct 70 due to the expansion of the bevel stand 30 does not occur.

When the main body 2 is rotated and the inclination angle of the rotary blade 4 is changed, the lever 60 shown in FIG. 5 is turned to loosen the screw connection between the penetrating member 50 and the nut 61. On the other hand, after changing the inclination angle of the rotary blade 4, the lever 60 is turned in the opposite direction to strengthen the screw connection between the penetrating member 50 and the nut 61. Then, the bevel stand 30 and the bevel plate 40 sandwiched between the head 52 of the penetrating member 50 and the lever 60 are pressed against each other, and the rotation of the main body 2 is restricted. That is, the rotary blade 4 is fixed at the changed inclination angle. Since the outer surface of the prismatic engaging portion 53 of the penetrating member 50 and the inner surface of the second long hole 41 are in contact with each other, the penetrating member 50 does not rotate with the rotation operation of the lever 60. That is, the penetrating member 50 does not rotate together.

The shape of the first long hole 31 provided in the bevel stand 30 and the second long hole 41 provided in the bevel plate 40 is not limited to the above shape. For example, the second long hole 41 can be changed to an arc-shaped long hole as shown in FIG. The second elongated hole 41 shown in FIG. 8 is an arc-shaped elongated hole that curves in the opposite direction to the first elongated hole 31. In this case, the penetrating member 50 that has reached the upper end 31 b of the first elongated hole 31. Can be more reliably paused at that position. In other words, the auto stop function works more reliably.

Generally, the frequency at which the inclination angle of the rotary blade 4 is set to 45 degrees is higher than the frequency at which the angle is set to 55 degrees. Therefore, the above-described auto stop function works more reliably further improves the convenience of the circular saw 1.

In this regard, if the second long hole 41 is an arc-shaped long hole as shown in FIG. 8, the penetrating member 50 is caused to react with the upper end inner surface of the first long hole 31, and the penetrating member 50 is adjusted to the adjustment hole. Inadvertently entering 32 is avoided, and unintentional rotation of the main body 2 is prevented. As shown in FIGS. 9A to 9D, when the main body 2 is rotated until the inclination angle of the rotary blade 4 reaches 45 degrees, the penetrating member 50 reaches the upper end 31b of the first elongated hole 31. . At this time, when the main body 2 is pivoted vigorously, the penetrating member 50 (shaft portion 51) collides with the inner surface of the upper end of the first long hole 31. In this case, if the second long hole 41 is linear, the penetrating member 50 is likely to move (drop) to the lower end side of the second long hole 41 due to a reaction that collides with the inner surface of the upper end of the first long hole 31 (FIG. 7). (See (c)). In other words, the penetrating member 50 enters the adjustment hole 32 and easily moves along the adjustment hole 32 in a direction close to the rotation center. On the other hand, when the second long hole 41 has an arc shape that curves in the opposite direction to the first long hole 31, the reaction that the penetrating member 50 collides with the inner surface of the upper end of the first long hole 31 causes the inner periphery of the second long hole 41 to It is received by the surface (see FIG. 9C). Therefore, a situation in which the penetrating member 50 inadvertently enters the adjustment hole 32 and moves in a direction close to the rotation center along the adjustment hole 32 is avoided.

(Embodiment 2) Hereinafter, another example of the embodiment of the portable cutting machine of the present invention will be described with reference to FIGS. 10 (a) and 10 (b). However, the portable cutting machine according to the present embodiment is a circular saw having the same basic configuration as the circular saw 1 according to the first embodiment. Therefore, regarding the configuration common to the circular saw 1 according to the first embodiment, the same reference numerals are attached to FIGS. 10A and 10B and the description thereof is omitted.

As shown in FIGS. 10A and 10B, the first long hole 31 is provided in the bevel stand 30 included in the circular saw according to this embodiment, and the second long hole 41 is provided in the bevel plate 40. Is provided. That is, the circular saw according to the present embodiment and the circular saw according to the first embodiment in that the bevel stand 30 provided with the first long hole 31 and the bevel plate 40 provided with the second long hole 41 are provided. 1 is common.

However, in the present embodiment, not only the second elongated hole 41 but also the first elongated hole 31 is a linear elongated hole. Specifically, each of the first long hole 31 and the second long hole 41 in the present embodiment is a substantially rectangular long hole and is a long hole extending in different directions.

As shown in FIGS. 10A and 10B, the penetrating member 50 (shaft portion 51) penetrating the first elongated hole 31 and the second elongated hole 41 is used to rotate the body not shown. Accordingly, the inside of the first long hole 31 moves along the first long hole 31 and the inside of the second long hole 41 moves along the second long hole 41. In other words, the penetrating member 50 moves simultaneously inside the first long hole 31 and the second long hole 41 as the main body rotates. FIG. 10A shows the positional relationship between the bevel stand 30, the bevel plate 40, and the penetrating member 50 (shaft portion 51) when the inclination angle of a rotary blade (not shown) is 0 degree. . FIG. 10B shows the positional relationship between the bevel stand 30, the bevel plate 40, and the penetrating member 50 (shaft portion 51) when the inclination angle of the rotary blade is 55 degrees.

As is clear from FIGS. 10A and 10B, the penetrating member 50 moves from the lower end 31a of the first elongated hole 31 toward the upper end 31b as the main body rotates, and the second elongated hole 31 41 moves from the upper end 41b toward the lower end 41a. In other words, the lower end 31a of the first elongated hole 31 and the upper end 41b of the second elongated hole 41 are starting points of movement of the penetrating member 50 when the main body is rotated in a direction in which the inclination angle of the rotary blade increases. The upper end 31 b of the first elongated hole 31 and the lower end 41 a of the second elongated hole 41 are the end points of the movement of the penetrating member 50.

If the extending direction of the 1st long hole 31 and the 2nd long hole 41 is caught from a viewpoint of the movement locus of the above penetration members 50, the 1st long hole 31 will be the penetration member 50 in this 1st long hole 31. Extends along a straight line Z1 connecting the starting point and the ending point of the movement. The second long hole 41 extends along a straight line Z 2 that connects the start point and the end point of the movement of the penetrating member 50 in the second long hole 41. The straight line Z1 and the straight line Z2 are non-parallel and intersect at the center of the penetrating member 50. As in the first embodiment, in a state before the penetrating member 50 moves inside both the second elongated hole 41 and the first elongated hole 31 (the state shown in FIG. 10A), the bevel is centered on the connecting member 21. In order to rotate the plate 40 counterclockwise, the second long hole 41 is inclined counterclockwise around the penetrating member 50 with respect to the first long hole 31. Further, the inclination angle is changed (in conjunction with) the change in the distance between the penetrating member 50 and the connecting member 21.

In the present embodiment, by moving the penetrating member 50 simultaneously with respect to the first long hole 31 and the second long hole 41, the main body can be maximized without extending the first long hole 31 and the second long hole 41. It can be rotated up to 55 degrees. That is, the rotation amount of the main body with respect to the base 3 is increased while avoiding the enlargement of the bevel stand 30 and the bevel plate 40 due to the extension of the first long hole 31 and the second long hole 41.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, it is possible to further reduce the size of the bevel stand by changing the arrangement and the angle and length of the long holes. In the first embodiment, the inclination angle is changed by forming a long hole inward from a 45 ° inclined position. However, by forming a long hole toward the outside at a position inclined at 15 °, the bevel stand area required for the inclination between 0 ° and 15 ° can be reduced, and further miniaturization can be realized.

DESCRIPTION OF SYMBOLS 1 ... Circular saw, 2 ... Main body, 3 ... Base, 3a ... Base bottom surface, 4 ... Rotary blade, 5 ... Housing, 6 ... Motor case, 6a ... Wind window, 7 ... Gear case, 8 ... Saw cover, 9 ... Safety cover, DESCRIPTION OF SYMBOLS 10 ... Handle, 11 ... Opening part, 20 ... Tilt mechanism, 21 ... Connecting member, 30 ... (1st plate) Bevel stand, 30a, 40a ... Through-hole, 31 ... First long hole, 31a ... Lower end, 31b ... Upper end , 32 ... adjustment hole, 40 ... (second plate) bevel plate, 41 ... second elongated hole, 41a ... lower end, 41b ... upper end, 50 ... penetrating member, 51 ... shaft portion, 52 ... head, 53 ... engagement 60, lever, 61, nut, 62, screw, 63, washer, 70, duct, 71, outlet

Claims

A portable cutting machine in which a main body including a rotary blade and a base are connected so as to be relatively rotatable, a connecting member for connecting the main body and the base so as to be relatively rotatable, and a first provided on the base. A plate, a first slot provided in the first plate, a second plate provided in the main body, a second slot provided in the second plate and communicating with the first slot, A penetrating member that penetrates through the first elongated hole and the second elongated hole and moves along the first elongated hole as the main body rotates. The penetrating member that has reached one end of the long hole is a long hole that extends in a direction that allows the penetrating member to move in a direction close to the connecting member, and the second long hole is a center of the connecting member. Portable cutting extending in a direction intersecting with a straight line connecting the center of the penetrating member .
The first plate is provided with an adjustment hole that is continuous with the end portion of the first elongated hole and extends from the end portion toward the center of the connecting member. 2. The portable cutting machine according to claim 1, wherein the penetrating member that has reached the end of the hole moves in a direction adjacent to the connecting member along the adjustment hole.
The portable cutting machine according to claim 1 or 2, wherein the first long hole has an arc shape and the second long hole has a linear shape.
The portable cutting machine according to claim 1 or 2, wherein the first elongated hole has an arc shape, and the second elongated hole has an arc shape that curves in a direction opposite to the first elongated hole.
A portable cutting machine in which a main body including a rotary blade and a base are connected so as to be relatively rotatable, a connecting member for connecting the main body and the base so as to be relatively rotatable, and a first provided on the base. A plate, a first slot provided in the first plate, a second plate provided in the main body, a second slot provided in the second plate and communicating with the first slot, A penetrating member penetrating the first elongated hole and the second elongated hole, wherein the first elongated hole and the second elongated hole extend in different directions, and the penetrating member is A portable cutting device that moves inside the first elongated hole along the first elongated hole and moves along the second elongated hole along the second elongated hole as the main body rotates. Machine.
A fan built in the main body, a blowout port provided in the vicinity of the rotary blade, and a wind that extends between the main body and the blowout port and guides an airflow generated by rotation of the fan to the blowout port. And the air passage extends between the main body and the outlet through a direction in which the first elongated hole extends. Portable cutting machine.
The second elongated hole is a square hole, and the penetrating member is provided with a prismatic engaging portion, and the inner surface of the second elongated hole and the outer surface of the engaging portion abut, The portable cutting machine according to any one of claims 1 to 6, wherein rotation of the penetrating member is restricted.