JP2002120202A - Circular saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out cutting work for a floor plate under a safe and stable state. SOLUTION: A circular saw has a base B placed on a material CM to be cut; a drive unit DU having an output axle 13 wherein it is, in a tiltable manner, connected to the base B along a first reference surface P1 crossing at right angles to the bottom surface 1a and a central axis is parallel to the first reference surface P1; circular teeth S attached to the output axle 13; and a circular teeth cover SC covering that. The circular saw teeth cover SC has a size covering practically the whole of the circular teeth S, has an opening part to the base B side, and is tiltably connected to the base B along the first reference surface P1. The drive unit DU can move to the base B along a second reference surface P2 corresponding to a plane of the circular saw teeth S. The circular saw teeth S makes frequent appearances from the opening part of the circular saw teeth cover SC according to a transfer distance to the base B side of the drive unit DU.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a circular saw.

[0002]

2. Description of the Related Art In recent years, circular saws in which a circular saw blade can be inclined with respect to a base have been proposed and widely used. Circular saws of this kind are generally suitable for cutting floorboards along the walls of a structure.

[0003] Japanese Patent No. 2933196 (hereinafter referred to as "prior art 1") and Japanese Utility Model Laid-Open Publication No. 4-30902 (hereinafter referred to as "prior art 2") disclose such a circular saw.

[0004]

However, in the circular saw disclosed in the prior art 1, the circular saw blade always protrudes below the bottom surface of the base, and thus the circular saw protruding downward from the base. The blade portion is usually covered by the movable cover during the non-cutting operation. Therefore, when cutting the floorboard, it is necessary to first rotate the movable cover to expose the circular saw blade with the base floating at the start of cutting. This state is not stable because the bottom surface of the base is not in contact with the material to be cut, that is, the floor plate.
The circular saw main body may be flipped by the repulsive force at the start of cutting. In addition, in such a cutting operation, the circular saw main body cannot be supported by both hands because one hand is used to rotate the movable cover.

Further, in order to cut the floorboard accurately along the wall, a guide surface along the wall is required, and the guide surface substantially coincides with the projected position of the circular saw blade from the bottom surface of the base. Must match. However, prior art 1
Circular saws do not have a tilt angle fine adjustment mechanism,
For workers performing both right angle and angled cuts,
Each time the angle is changed, it is necessary to adjust the projecting position of the circular saw blade, resulting in a very troublesome operation. Further, in order to achieve the above-described state at the time of the maximum inclination, it is necessary to finish all parts of the inclination mechanism with high accuracy, which causes an increase in manufacturing cost.

In the circular saw disclosed in the prior art 2,
The circular saw blade always projects below the bottom of the base,
In addition, since it does not have a movable cover as in the prior art 1, it does not satisfy safety standards. Also, at the start of cutting, as in the prior art 1, it is necessary to start cutting with the base raised, so that the accuracy of the cutting position cannot be secured, and the repulsive force at the start of cutting causes the circular saw body to rebound. There is a possibility that it will be removed. Further, in a state where the circular saw blade is inclined, there is no guide surface along the wall, and there is a possibility that the circular saw blade may cut into the wall. When cutting at a position as close to the wall as possible is required by right-angle cutting, the fixed cover covering the upper part of the circular saw blade comes into contact with the wall, and a sliding mark is formed. The area where the mark occurs is covered by a skirting board, that is, beyond the protection area, and particularly when the sliding mark is remarkable, the wall needs to be repaired. In addition, although a joist is erected below the floor plate, if the cut by the circular saw blade is deeper than the thickness of the floor plate, there is a possibility that the joist may be cut. Moreover, when the circular saw blade is perpendicular to the base and when the circular saw blade is inclined, the amount of protrusion of the circular saw blade from the base is different, so that it has been difficult to obtain an accurate cutting depth.

An object of the present invention is to perform a cutting operation of a floor plate in a safe and stable state, and to easily adjust a projecting position of a circular saw blade in both a right angle cutting and an inclined cutting. Another object of the present invention is to provide a circular saw that can perform a cutting operation and does not damage surrounding structures during a cutting operation.

[0008]

According to a first aspect of the present invention, there is provided a base (B) mounted on a material to be cut (CM) and a base (B) mounted on the base (B). Bottom (1
An output shaft (13) which is tiltably connected to the base (B) along a first reference plane (P1) orthogonal to a) and whose central axis is parallel to the first reference plane (P1). A drive unit (DU), a circular saw blade (S) attached to the output shaft (13) of the drive unit (DU), and a circular saw blade cover (SC) covering the circular saw blade (S). In the circular saw provided, the circular saw blade cover (SC) has a size to cover substantially the entire circular saw blade (S), and has an opening on the base (B) side. And the base (B) is connected to the base (B) so as to be tiltable along the first reference plane (P1), and the drive unit (DU) includes the first unit (DU).
Being tiltable along a reference plane (P1) and movable with respect to the base (B) along a second reference plane (P2) corresponding to the plane of the circular saw blade (S); The circular saw blade (S) protrudes and retracts from the opening of the circular saw blade cover (SC) according to the amount of movement of the drive unit (DU) toward the base (B).

According to a second aspect of the present invention, in the circular saw of the first aspect, the movement of the drive unit (DU) is a rotation about a single support shaft (12). I do.

According to a third aspect of the present invention, in the circular saw according to the first or second aspect, an inclined locking means (CL) for locking the circular saw blade cover (SC) with respect to the base (B). Is further provided.

According to a fourth aspect of the present invention, in the circular saw according to any one of the first to third aspects, the circular saw blade (S) is housed in the circular saw blade cover (SC). An elastic holding means (RM) for applying a pressing force to the driving unit (DU) so as to hold the driving unit (DU) is further provided.

According to a fifth aspect of the present invention, in the circular saw according to any one of the first to fourth aspects, the circular saw blade cover (S
C) is connected to a front end portion of the base (B), and in a state where the circular saw blade (S) is held at a right angle to the base (B), The front end is located forward of other members.

According to a sixth aspect of the present invention, in the circular saw according to the fifth aspect, the circular saw blade cover (SC) is provided in a state where the circular saw blade (S) is inclined at the maximum with respect to the base (B).
The lowermost end of the circular saw blade (S) protruding from the opening is located forward of the front end of the base (B).

According to a seventh aspect of the present invention, in the circular saw of any one of the first to sixth aspects, an angle for regulating a maximum inclination angle of the circular saw blade (S) with respect to the base (B). It is characterized by further comprising a regulating means (AR).

According to an eighth aspect of the present invention, in the circular saw according to any one of the first to seventh aspects, a movement limit position of the drive unit (DU) toward the base (B) is set to be adjustable.
The apparatus further comprises a cutting depth adjusting means (CA) for adjusting an amount of projection of the circular saw blade (S) from a lower surface of the base (B).

According to a ninth aspect of the present invention, in the circular saw of the eighth aspect, the cutting depth adjusting means (CA) is provided with a cutting depth stopper (movable) provided on the circular saw blade cover (SC). 18) and the cutting depth stopper (1)
8) A display for displaying a contact depth (19) provided on the drive unit (DU) side and a cut depth according to a moving position of the cut depth stopper (18) so as to be able to contact the drive unit (DU). Part (20) and the cutting depth stopper (1
8) and a stopper lock mechanism (21) for locking the circular saw blade cover (SC).

According to a tenth aspect of the present invention, in the circular saw of the ninth aspect, the display unit (20) is in a state where the circular saw blade (S) is held at right angles to the base (B). A first scale (20a) indicating a depth of cut by the circular saw blade (S), and the circular saw blade (S) in a state where the circular saw blade (S) is inclined to the maximum with respect to the base (B). S), the second scale (20) indicating the cutting depth
b).

[0018] According to an eleventh aspect of the present invention, in the circular saw according to any one of the first to tenth aspects, the circular saw blade (S) is provided.
Is accommodated in the circular saw blade cover (SC), and the drive unit (DU) is connected to the circular saw blade cover (S).
It is characterized by further comprising a unit lock means (UL) for locking to C).

According to a twelfth aspect of the present invention, in the circular saw of the eleventh aspect, the unit lock means (UL) includes an engaging portion (7a) provided on the circular saw blade cover (SC) and the drive unit. The drive unit (DU) is slidably provided on the drive unit (DU) so as to engage with the engagement portion (7a) when the unit (DU) is in an unused state, and has a hemispherical tip (23a). A lock member (23) having a hemispherical tip (23a) by urging the lock member (23).
And an elastic member (24) for elastically projecting toward the circular saw blade cover (SC).

According to a thirteenth aspect of the present invention, in the circular saw of the twelfth aspect, the lock member (23) has an L-shaped operation part (23b), and one of the operation parts (23b) is provided. By turning in the direction, the lock member (23) is held in the unlocked state, and by turning the operation portion (23b) in the opposite direction, the lock member (23) is held in the lockable state. It is characterized by the following.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a circular saw according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

<Embodiment 1> A circular saw according to the present invention comprises a base B, a drive unit DU, a circular saw blade S, and a circular saw cover S.
C, and further, as additional components, the inclination locking means CL and the elastic holding means R
M, an angle regulating means AR, a cutting depth adjusting means CA, and a unit locking means UL.

The base B is mounted on the material CM to be cut. As is apparent from FIGS. 1 to 3, the base body 1 has a rectangular shape, and the base body 1 extends upward from the leading edge of the base body 1. A front regulation plate 2 projecting at a right angle, and a pair of side plates 3 projecting at right angles upward from both side edges of the base body 1 respectively;
And 4.

The bottom surface 1a of the base body 1 is flat and slidable on the workpiece CM in a stable state. The base main body 1 has a slit-shaped opening 1b formed by cutting out a central portion at the distal end edge.

As shown in FIGS. 1 and 2, the front restriction plate 2 has a belt-like guide surface 2a. The guide surface 2 a is arranged at an interval upward from the leading edge of the base body 1. The guide surface 2a comes into contact with a wall of a structure or the like, thereby ensuring stable movement of the circular saw and improving cutting accuracy.

As is apparent from FIGS. 1 to 4, the side plates 3 and 4 are provided at the upper and front positions with the cover connecting portions 3 and 4, respectively.
a and 4a, respectively. Also, one side plate 3 is
The tilt locking means mounting portion 3b is located at an upper and rear side position.
have.

The drive unit DU includes a housing 9, a motor (not shown) built in the housing 9, a power transmission mechanism (not shown), and the like. Housing 9
Has a handle 9a. The output shaft 13 of the drive unit DU protrudes from the front end of the housing 9. A support arm 10 extending in a direction perpendicular to the output shaft 13 is fixed to a tip of the housing 9. As shown in FIGS. 5 and 6, the support arm 10 fixed to the above-described drive unit DU is connected to a circular saw blade cover SC via a support shaft 12.
To be rotatably connected to. This connection is made by circular saw blade cover S
A detailed description of the connection of the drive unit DU follows the description of the circular saw blade cover SC, since it is closely related to the components of C.

The circular saw blade S is mounted on the output shaft 13 of the drive unit DU described above. Since the mounting of the circular saw blade S is also closely related to the components of the circular saw blade cover SC, a detailed description of the mounting of the circular saw blade S to the output shaft 13 is described in the description of the circular saw blade cover SC. Done after

The circular saw blade cover SC includes a substantially circular rear cover member 7 and a substantially identical front cover member 8 screwed thereto. This circular saw blade cover SC
Has a size that covers substantially the entire circular saw blade S, as shown in FIG. That is, the circular saw blade cover SC secures a space in which the circular saw blade S can be substantially completely accommodated, and has an opening below the circular saw blade S.

The rear cover member 7 has a long hole 7a extending vertically in a central position. The output shaft 13 of the drive unit DU is located in the circular saw blade cover SC through the elongated hole 7a. In this state, the elongated hole 7a is vertically moved with respect to the circular saw blade cover SC of the drive unit DU. Allow movement.

On the other hand, the front cover member 8 has a long hole 8a extending in the vertical direction at the center position. In order to attach and detach the circular saw blade S to and from the output shaft 13 of the drive unit DU, an operation of attaching and detaching the flange 14 to and from the output shaft 13 is required. This operation is performed through the above-described elongated hole 8a.

The lower end portions on both sides of the circular saw blade cover SC are connected to the cover connecting portions 3 on the side plates 3 and 4 of the base B.
a and 4a are rotatably connected via connecting shafts 5 and 6, respectively. The center axes of the connecting shafts 5 and 6 are aligned with each other, and the center axis is parallel to the lower surface 1a of the base B. Therefore, the circular saw blade cover SC is rotatable about the connecting shafts 5 and 6 along the first reference plane P1 orthogonal to the bottom surface 1a of the base B in the front-rear direction (see FIG. 1).

In the rear cover member 7 of the circular saw blade cover SC, a bracket 11 is mounted at a position deviated to one side from the elongated hole 7a, that is, a position deviated to the left in FIG. The bracket 11 has a support shaft 12 extending at right angles to the rear cover member 7, and the above-described support arm 10 is rotatably connected to the support shaft 12. Therefore, the drive unit DU attached to the support arm 10 is rotatable about the support shaft 12 with respect to the circular saw blade cover SC along a plane parallel to the plane of the rear cover member 7.

In such a state of connection with the circular saw blade cover SC, the center axis of the output shaft 13 of the drive unit DU is located parallel to the first reference plane P1 orthogonal to the bottom surface 1a of the base B.

The circular saw blade S is inserted into the circular saw blade cover SC through an opening below the circular saw blade SC, and the drive unit DU rotatably connected to the circular saw blade cover SC as described above.
Attached to the output shaft 13.

Accordingly, the drive unit DU is tiltably connected to the base B via the bracket 11 along the first reference plane P1 orthogonal to the bottom surface 1a of the base B. The center axis of the output shaft 13 is parallel to the first reference plane P1 (see FIG. 1). The center axis of the output shaft 13 is substantially orthogonal to the plane of the circular saw blade S. Therefore, the drive unit DU is further rotatable with respect to the circular saw blade cover SC along the second reference plane P2 corresponding to the plane of the circular saw blade S.

The above-mentioned drive unit DU is given a pressing force by the elastic holding means RM, and a coil spring having a pair of legs is used as the elastic holding means RM. That is, the coil spring RM has the above-described support shaft 12 inserted therein. One leg is engaged with the support arm 10, and the other leg is engaged with the bracket 11 side. Therefore, the coil spring RM
Imparts an elastic force acting on the drive unit DU to lift it upward.

Therefore, against the coil spring RM,
When the drive unit DU is rotated with respect to the circular saw blade cover SC, the circular saw blade S projects downward from the opening of the circular saw blade cover SC. In other words, the base B of the drive unit DU
The circular saw blade S protrudes and retreats from the opening of the circular saw blade cover SC, and similarly protrudes and retreats from the opening 1b of the base B according to the amount of movement to the side, that is, the amount of rotation.

FIG. 3 shows a state in which the circular saw blade S is held at a right angle to the base B and the drive unit DU is placed on the uppermost position. FIG. B shows a state where it is held at right angles to B and the drive unit DU is placed at the lowest position. As is clear from FIG. 4, in a state where the circular saw blade S is held at a right angle to the base B, the front end of the base B, that is, the front regulating plate 2
It is located ahead of other members. Of course, in such a state, the front cover member 8 of the circular saw blade cover SC,
The flange 14 of the circular saw blade S also does not protrude forward from the front regulating plate 2. Therefore, when cutting is performed at a position as close to the wall as possible by right-angle cutting, the portion that comes into contact with the wall is only the front regulation plate 2. The height of the front restricting plate 2 is significantly smaller than the height of the entire circular saw. Therefore, even if a sliding mark is generated due to the contact of the front restricting plate 2, the range of occurrence is limited to the width. It can be kept in a wood protected area and does not require wall repair work.

FIG. 8 shows a state in which the circular saw blade S is held at the maximum inclination with respect to the base B, and the drive unit DU is placed at the lowest position. As is clear from FIG. 8, in a state where the circular saw blade S is inclined to the maximum with respect to the base B, the lowermost end of the circular saw blade S protruding from the opening of the circular saw blade cover SC is located on the front side of the base B. It is located at the end, that is, ahead of the front regulation plate 2. Therefore, the inclined cutting can be performed at a position as close to the wall as possible. Of course, the front cover member 8 of the circular saw blade cover SC is provided above the front regulating plate 2 in the same manner as in the above-described right angle cutting.
Also, the flange 14 of the circular saw blade S does not protrude forward from the front regulating plate 2. Therefore, even when performing the inclined cutting, only the front regulating plate 2 is in contact with the wall. Even if a sliding mark occurs on the wall due to the contact of the front regulating plate 2 with the wall, The range of occurrence can be kept within the protected area by the baseboard, and no wall repair work is required.

The inclined locking means CL not only maintains the state where the circular saw blade S is held at a right angle to the base B, but also the state where the circular saw blade S is inclined at a predetermined angle with respect to the base B. Has the function of holding.

That is, as shown in FIGS. 3 to 6, the tilt locking means CL is composed of an arm-shaped portion 11 a formed integrally with the bracket 11 described above, and a tilt lock lever 15.
And a mounting screw 16.

As described above, the bracket 11 is attached to the rear cover member 7 of the circular saw blade cover SC, and the arm-like portion 11a extends rearward from the bracket 11 on the side plate 3 of the base B. It is formed integrally with the bracket 11 so as to extend along the inner side surface.
As shown in FIG. 7, the arm-shaped portion 11a has an arc-shaped hole 11b at an end. The center of the arc corresponding to the arc-shaped hole 11b is formed by attaching the circular saw blade cover SC to the side plate 3 of the base B.
Coincides with the central axis of the connecting shafts 5 and 6 that are connected to.

As shown in FIG. 5 and FIG.
6 is fixed to the inclined locking means mounting portion 3b of the side plate 3 of the base B. The tip of the mounting screw 16 projects inwardly of the side plate 3 in parallel with the center axis of the connecting shaft 5, and forms an arc-shaped hole 11b of the arm-shaped portion 11a.
Is inserted inside.

As shown in FIG. 5, the tilt lock lever 15
Has a lock nut 15a fixed thereto, and the lock nut 15a
It is attached to the tip of. When the tilt lock lever 15 is rotated upward, the arm-shaped portion 11a is pressed against the side plate 3 of the base B due to the tightening of the lock nut 15a, so that the arm-shaped portion 11a is pressed against the side plate 3 of the base B. Locked. Therefore, this arm-shaped portion 11
a drive unit DU via a bracket 11 having a
Are locked to the base B.

On the other hand, if the tilt lock lever 15 is rotated downward, the pressure applied to the arm-shaped portion 11a is released due to the looseness of the lock nut 15a, and the angle of the drive unit DU with respect to the base B is changed. Will be possible.

The angle regulating means AR comprises a base B of the circular saw blade S.
Has the effect of restricting the maximum inclination angle with respect to. That is,
As shown in FIGS. 7 and 15, the angle restricting means AR is screwed to the arm-shaped portion 11 a, and restricts the maximum inclination angle of the circular saw blade S with respect to the base B by bringing the tip into contact with the base B. The adjusting screw 17 is provided. At approximately the center of the above-described arm-shaped portion 11a, an adjusting screw attachment piece 11c is integrally formed so as to protrude inward (see FIG. 7). The adjusting screw 17 is screwed to the adjusting screw attaching piece 11c. The tip of the adjustment screw 17 can contact the upper surface of the base B.

Accordingly, if the locking state of the above-mentioned inclination locking means CL is released and the screwing amount of the adjusting screw 17 is adjusted, the maximum inclination angle of the circular saw blade S with respect to the base B is changed. That is, by increasing the screwing amount of the adjusting screw 17 and increasing the length of the adjusting screw 17 protruding from the adjusting screw mounting piece 11c, the maximum inclination angle, that is, in FIG. Perpendicular and circular saw blade S
And the angle between them becomes smaller. On the other hand, if the screwing amount of the adjusting screw 17 is reduced and the length of the adjusting screw 17 protruding from the adjusting screw mounting piece 11c is reduced, the maximum inclination angle is increased.

If the maximum inclination angle of the circular saw blade S is set in advance as described above, the locked state of the inclination locking means CL is released, and only the circular saw blade cover SC is inclined together with the drive unit DU. The set maximum inclination angle of the circular saw blade S is obtained.

When forming the arc-shaped hole 11b of the arm-shaped portion 11a of the inclined locking means CL, the mounting screw 16 is attached to the arc-shaped hole 11b with the circular saw blade S placed at right angles to the base B. It is configured to contact the lower end of the.

The cutting depth adjusting means CA has the function of adjusting the amount of movement of the circular saw blade S from the lower surface of the base B by enabling the movement limit position of the drive unit DU toward the base B to be adjusted. That is, as shown in FIGS. 5 and 6, the cut depth adjusting means CA is provided with a cut depth stopper 18.
, A contact part 19, a display part 20, and a stopper lock mechanism 21.

The cut depth stopper 18 is rotatably mounted on the rear cover member 7 of the circular saw blade cover SC via a support pin 22 at a position opposite to the support shaft 12 with respect to the elongated hole 7a. ing. The upper edge 18a at the tip of the cutting depth stopper 18 functions as a pointer, and cooperates with a display unit 20 described later to rotate the cutting depth stopper 18 (that is, the cutting depth by the circular saw blade S). Display). The cut depth stopper 18 has an arc-shaped hole 18b. The center of the arc corresponding to the arc-shaped hole 18b coincides with the center axis of the support pin 22.

The contact portion 19 is composed of a pin provided on the housing 9 of the drive unit DU. Pin 19
When the drive unit DU rotates about the support shaft 12 together with the circular saw blade S, the cutting depth stopper 1 described above is used.
8 abuts on the pointer 18a, thereby restricting the downward rotation position of the drive unit DU, that is, the cutting depth by the circular saw blade S.

The display section 20 is formed in an arc shape.
The pointer 18 a of the cut depth stopper 18 is attached to the rear cover member 7 so as to move on the upper surface of the display unit 20.

As shown in FIG. 8, when the circular saw blade S is tilted to the maximum with respect to the base, the maximum of the circular saw blade S (shown by a solid line in FIG. 8) from the lower surface of the base B is obtained. The vertical length corresponding to the protrusion amount, that is, the cut depth is
In a state where the circular saw blade S is held at a right angle to the base B, the circular saw blade S from the lower surface of the base B (in FIG. 8,
(Indicated by a dashed line), ie, the cut depth, the former being shorter than the latter by the distance L1.

In view of such a fact, the display unit 2 described above is used.
0 has a first scale 20a positioned outside and a second scale 20b positioned inside as shown in FIG. The first scale 20a indicates the cutting depth of the circular saw blade S in a state where the circular saw blade S is held at right angles to the base B. The second scale 20b indicates the cutting depth of the circular saw blade S in a state where the circular saw blade S is inclined at the maximum with respect to the base B.

The stopper lock mechanism 21 is fixed so as to protrude rearward from the rear cover member 7, and is attached to a mounting screw 21 b penetrating through the arc-shaped hole 18 b of the cutting depth stopper 18, and is attached to a tip of the mounting screw 21 b. And a lock lever 21a. The lock lever 21a has a lock nut that rotates integrally with the lock lever 21a.
Of the mounting screw 21b protruding from the arc-shaped hole 18b.

In FIG. 5, if the lock lever 21a is rotated downward, the tightening of the lock nut causes
The cut depth stopper 18 is pressed against the rear cover member 7, so that the cut depth stopper 18 is locked to the rear cover member 7.

On the other hand, in FIG. 5, the lock lever 21a
Is turned upward, the pressure applied to the cut depth stopper 18 is released due to the loosening of the lock nut, and the rotation angle of the cut depth stopper 18 can be changed.

The unit locking means UL has an operation of locking the drive unit DU to the circular saw blade cover SC in a state where the circular saw blade S is housed in the circular saw blade cover SC. That is, the unit locking means UL is provided in the manner shown in FIGS.
As shown in FIG. 0, it is composed of an engaging portion 7a, a lock member 23, and an elastic member 24.

The engaging portion 7a is formed as a concave portion and is provided at a predetermined position of the rear cover member 7 in the circular saw blade cover SC.

When the circular saw blade S is accommodated in the circular saw blade cover SC and is not used, the lock member 23 is engaged with the driving unit D so that the lock unit 23 engages with the engaging portion 7a.
U is slidably provided in the housing 9 (FIG. 19).
reference). The lock member 23 has a hemispherical tip 23a, and an L-shaped operation portion 23b is provided at the rear end.

The elastic member 24 is composed of a coil spring mounted around a lock member 23 slidably provided on the housing 9 and biases the lock member 23 to move the hemispherical tip 23a to a circular saw blade. It has the function of elastically projecting toward the cover SC.

The lock member 23 is held in an unlocked state by the rotation of the lock member 23 in one direction of the operation portion 23b, and the lock member 23 can be locked by the rotation of the operation portion 23b in the opposite direction. Held in state. That is, the lock member 23 is slidably inserted into the support portion 9b formed by building up a part of the housing 9, and the end of the support portion 9b on the side of the operation portion 23b is inclined. The surface 9c is formed. The operation section 23b is rotatable along the inclined surface 9c.

FIGS. 17 to 20 show the unlocked state of the lock member 23. FIG. As shown by a solid line in FIG. 18, when the operation unit 23b is lifted upward, the operation unit 23b
As is clear from FIGS. 19 and 20, the support portion 9
b, the lock member 23 slides to the left against the coil spring 24, and the engagement between the distal end 23a of the lock member 23 and the engagement portion 7a is released. You. As a result, the lock member 23 is placed in the unlocked state.

On the other hand, as shown by a dashed line in FIG. 18, when the operation portion 23b is pulled down,
20B moves in the opposite direction along the inclined surface 9c of the support portion 9b, as indicated by a dashed line in FIG. 20, and the lock member 23 slides to the right by the action of the coil spring 24, and the lock member 23 Of the supporting portion 9b protrudes from the end face of the supporting portion 9b. As a result, the lock member 23 is placed in a lockable state. In such a lockable state, the tip 23a of the lock member 23 projects from the end face of the support portion 9b by the action of the coil spring 24, so that the circular saw blade S is housed in the circular saw blade cover SC. When the drive unit DU reaches a predetermined position with respect to the circular saw blade cover SC, the leading end 2 of the lock member 23 is closed.
3a automatically engages with the engaging portion 7a of the circular saw blade cover SC.

The above-described front regulation plate 2 of the base B is
As best understood from FIGS. 1 and 2, the base body 1 has been described as having the belt-like guide surface 2 a spaced upward from the leading edge of the base body 1. The surface 2a is not always necessary. That is, FIG.
As shown in FIG. 12, a pair of front regulation plates 2m and 2m having a relatively short height may be provided on both sides of the distal end edge of the base body, and the above-described guide surface 2a may be omitted. When such a base B is used, when cutting along the wall, the area of the front regulation plates 2m and 2m that contact the wall can be significantly reduced. Therefore, even if sliding marks are generated on the wall due to the contact of the front regulating plates 2m and 2m with the wall, the range of occurrence is extremely narrow, and can be sufficiently retained in the protection area by the baseboard. No wall repair work is required. In the circular saw shown in FIGS. 11 to 16, such a base B is used.

Next, a method of using the above-described circular saw will be described.

First, when cutting is performed at a position as close to the wall as possible by right-angle cutting, the tilt lock lever 15 is rotated downward to release the pressure applied to the arm-shaped portion 11a. The drive unit DU is rotated to the uppermost position. Arm-shaped part 1 in tilt locking means CL
When the circular saw blade S is placed at a right angle to the base B, the mounting screw 16 is
Since the drive unit DU is rotated to the uppermost position as described above, the circular saw blade S is placed at a right angle to the base B since the drive unit DU is rotated to the uppermost position. In such a state, the drive unit DU is locked to the base B by rotating the tilt lock lever 15 upward.

Next, the lock lever 21a of the cutting depth adjusting means CA is operated to set the pointer 18a of the cutting depth stopper 18 to a desired cutting depth of the first scale 20a.

Next, the operation portion 23b of the unit lock means UL is lifted upward as shown by the solid line in FIG. 18, and the lock member 23 is placed in the unlocked state.

When the drive unit DU is pressed downward in such a state, the drive unit DU rotates about the support shaft 12 and changes from the state shown in FIGS. 1, 3 and 5 to FIG. 4 and 6, the circular saw blade S projects from the lower surface 1a of the base B. In the rotation operation of the drive unit DU, the contact portion provided on the housing 9 of the drive unit DU, that is, the pin 19 abuts on the pointer portion 18a of the cutting depth stopper 18, whereby the drive unit DU is rotated. The downward pivoting position is limited, and a desired cutting depth by the circular saw blade S is obtained.

When cutting is performed as close to the wall as possible by tilt cutting, the tilt lock lever 1 is used.
5 is rotated downward to release the pressing applied to the arm-shaped portion 11a, and the drive unit DU is rotated to the lowest position. Of course, before rotating the drive unit DU to the lowermost position, fine adjustment of the maximum tilt angle is performed in advance by adjusting the adjusting screw 17 of the angle regulating means AR. Therefore, when the drive unit DU is rotated to the lowermost position as described above, the tip of the adjusting screw 17 comes into contact with the upper surface of the base B, and a preset maximum tilt angle is obtained. In such a state, the drive unit DU is locked to the base B by rotating the tilt lock lever 15 upward.

Next, the lock lever 21a of the cutting depth adjusting means CA is operated to set the pointer 18a of the cutting depth stopper 18 to a desired cutting depth of the second scale 20b.

Next, the operation portion 23b of the unit lock means UL is lifted upward as shown by the solid line in FIG. 18, and the lock member 23 is placed in the unlocked state.

When the drive unit DU is pressed downward in such a state, the drive unit DU rotates about the support shaft 12, and from the state shown in FIG. 7 to FIGS.
The circular saw blade S moves to the state shown in FIG.
protruding from a. In the rotating operation of the drive unit DU, as in the case of the above-described right-angle cutting, the contact portion provided on the housing 9 of the drive unit DU, that is, the pin 19 is connected to the pointer portion 18a of the cutting depth stopper 18. , Whereby the downward pivoting position of the drive unit DU is limited, and a desired cutting depth by the circular saw blade S is obtained.

The operation section 23 of the unit lock means UL
When the lock member 23 is placed in a lockable state by operating the b, the circular saw blade S is housed in the circular saw blade cover SC, and the drive unit DU reaches a predetermined position with respect to the circular saw blade cover SC. Meanwhile, the distal end 23a of the lock member 23 automatically engages with the engaging portion 7a of the circular saw blade cover SC. Therefore, when the circular saw is not used, even if a force pressing the drive unit DU downward acts on the circular saw, the drive unit DU does not rotate downward, and accordingly, the circular saw blade S moves the lower surface 1a of the base B. From accidentally protruding from

In the above embodiment, the drive unit DU has been described as rotating about a single support shaft 12, but is not limited to this structure.
The drive unit DU may be moved in any manner as long as the circular saw blade S can be made to protrude and descend from the lower surface 1a of the base B. For example, the drive unit DU slides vertically with respect to the base B. May be.

Further, in order to simplify the structure, the support shaft 12 as the center of rotation of the drive unit DU has been described as being provided on the circular saw blade cover SC. However, the present invention is not limited to this structure. The support shaft 12 may be provided on the base B as long as the movement of the drive unit DU relative to the base B can be ensured. Furthermore, in the inclination locking means CL and the cutting depth adjusting means, a thumb screw may be used as a means for tightening or loosening.

<Embodiment 2> As shown in FIGS. 21 to 25, the unit locking means UL of the circular saw includes an engaging portion 7a and a lock member similarly to the case of the circular saw of the first embodiment. 23 and an elastic member 24, which act to lock the drive unit DU to the circular saw blade cover SC in a state where the circular saw blade S is housed in the circular saw blade cover SC. It differs from the unit lock means UL in the first embodiment as follows.

That is, as shown in FIGS. 22 and 23, the engaging portion 7a of the unit lock means UL is a pin, and is fixed to the housing 9 of the drive unit DU so as to protrude in parallel with the support shaft 12. . Further, as shown in FIGS. 22 to 24, the lock member 23 of the unit lock means UL is formed as a claw-shaped hook which can be disengaged from the pin serving as the engagement portion 7a. The lock member 23 is located at a predetermined position of the rear cover member 7 in the circular saw blade cover SC.
It is rotatably supported by a support shaft 25 composed of a bolt protruding in parallel with the pin serving as the engaging portion 7a. The lock member 23 is provided with an operation portion 23b for catching a finger when releasing the engagement with the engagement portion 7a. The elastic member 24 is a torsion coil spring. As shown in FIG. 24, the elastic member 24 is mounted on the support shaft 25 and both ends thereof are respectively locked by the locking member 23 and the locking pins 26 on the rear cover member 7. Lock member 23
Is constantly urged by the elastic member 24 in a direction in which it can engage with the engaging portion 7a. The locking pin 26 penetrates a long hole 27 that is formed in the locking member 23 and curves around the support shaft 25, and the locking pin 26 comes into contact with one end of the long hole 27 so that the locking member 23 is It stops at the solid line position of 24 (A). The tip portion 23c of the hook, which is the lock member 23, is curved, and the engaging portion 7a that rotates around the support shaft 12 together with the housing 9 in the stationary state at the solid line position.
Is provided so as to be present on the rotation locus of. The lock member 23 has a common tangent line a at a contact point between the distal end portion 23c of the lock member 23 and the engagement portion 7a, and a tangent line b drawn at the contact point in an arc centered on the support shaft 12 and passing through the contact point. Are formed so as to form a predetermined angle A.

The lock member 23 is connected to the drive unit DU.
Of the circular saw blade cover S
It may be provided on the C side.

When cutting the material to be cut by the circular saw, first, the lock by the lock member 23 is released. To release the lock, the lock member 2 in the state of FIG.
The lock member 23 is rotated counterclockwise around the support shaft 25 so as to oppose the urging force of the elastic member 24 by putting a finger on the third operation portion 23b. As a result, as shown in FIGS. 25B and 25A, the lock member 23 releases the engagement portion 7a, and the housing 9 of the drive unit DU can rotate downward with the support shaft 12 as a fulcrum. As shown in FIG.
Protrudes from the opening of the circular saw blade cover SC to cut the workpiece.

On the other hand, when the housing 9 of the drive unit DU is released, the housing 9 rotates upward due to the elasticity of the coil spring RM, and as shown in FIGS. Tip 23
abuts on c. Then, the elastic force of the coil spring RM overcomes the urging force of the elastic member 24, and FIG.
As shown in (C), the engaging portion 7a rotates the lock member 23 counterclockwise, and finally the engaging portion 7a
And engage again. As a result, the housing 9 of the drive unit DU is placed in the locked state.

<Third Embodiment> As shown in FIGS. 26 and 27, this circular saw is provided with a dust collection duct 28 on the rear cover member 7 of the circular saw blade cover SC. Dust collection duct 28
Is a tubular body such as a cylinder, and is provided to project from the rear cover member 7. The dust collection port 28a of the dust collection duct 28 can be opened and closed by a lid 29, and the plate-shaped lid 29 is a fixing screw 30 which is a fixing tool.
, And is fixed to the tip of the dust collection duct 28. At the center of the dust collecting duct 28, a female screw portion 31 having a female screw 31a screwed with the thumb screw 30 is provided so as not to block the ventilation path for dust collection. The rear cover member 7 is provided with a storage recess 32 for attaching the lid 29 removed from the dust collection duct 28 so as not to be lost. A female screw 33 into which the thumbscrew 30 can be screwed is formed in the center of the storage recess 32. By fitting the lid 29 removed from the dust collection duct 28 into the storage recess 32 and fixing it with the thumb screw 30, the lid 29 can be stored without being lost.

When dust is collected during the cutting operation by the circular saw blade, the lid 29 is removed from the dust collection duct 28, and a dust collection hose (not shown) is connected to the dust collection port 28a of the dust collection duct 28.
Collects chips, chips, etc., which are generated as a result of cutting the workpiece. The lid 29 and the thumb screw 30 removed from the dust collection duct 28 are stored in the storage recess 32 of the rear cover member 7.
When dust is not collected during the cutting operation, the dust collection port 28a of the dust collection duct 28 is covered with the lid 29, and chips and the like are collected.
It is prevented from scattering from 8a to the handle 9a side.

[0087]

According to the circular saw of the first aspect of the present invention, the circular saw blade cover has a size enough to cover substantially the entire circular saw blade and has an opening on the base side. And the drive unit is tiltably connected to the base along a first reference plane orthogonal to the bottom surface of the base, and the drive unit is tiltable along the first reference plane and corresponds to a plane of the circular saw blade. The circular saw blade is configured to be movable along the second reference plane with respect to the base, and the circular saw blade is protruded and retracted from the opening of the circular saw blade cover in accordance with the amount of movement of the drive unit toward the base. Since there is no movable cover as in the technique 1, the circular saw main body can be supported by both hands in the cutting operation, and a safe cutting operation can be secured.

As described in claim 2, if the movement of the drive unit is made to rotate around a single support shaft, the movement of the drive unit can be realized with a simple configuration.

According to the third aspect of the present invention, if a tilt locking means for locking the circular saw blade cover to the base is further provided, the position of the circular saw blade cover with respect to the base can be easily secured. Either a state in which the circular saw blade is held at a right angle to the base or a state in which the circular saw blade is inclined at the maximum with respect to the base can be selectively and easily obtained.

According to a fourth aspect of the present invention, there is further provided an elastic holding means for applying a pressing force to the drive unit such that the circular saw blade is held in the circular saw blade cover. As long as no external force is applied to the drive unit, the circular saw blade can be housed in the circular saw blade cover to ensure safety.

As described in claim 5, the circular saw blade cover is connected to the front end of the base, and when the circular saw blade is held at right angles to the base, the front end of the base is formed. However, if it is configured so as to be located forward of the other members, it is possible to prevent damage to the wall when performing a right angle cut at a position as close to the wall as possible.

As described in claim 6, when the circular saw blade is inclined at the maximum with respect to the base, the lowermost end of the circular saw blade protruding from the opening of the circular saw blade cover is the front end of the base. If it is comprised so that it may be located ahead of a part, the inclined cutting in the position as close as possible to a wall can be performed easily and reliably.

As described in claim 7, if an angle regulating means for regulating the maximum inclination angle of the circular saw blade with respect to the base is further provided, fine adjustment of the maximum inclination angle can be performed in advance according to the preference of the user. It can be performed, and there is no need to perform complicated adjustment work during the actual cutting work.

[0094] As described in claim 8, the cutting depth adjusting means for adjusting the movement limit position of the drive unit toward the base so as to adjust the amount of projection of the circular saw blade from the lower surface of the base is provided. If further provided, a preset depth of cut can be easily and reliably obtained.

According to a ninth aspect of the present invention, the cutting unit is provided such that the cutting depth adjusting means can be brought into contact with the cutting depth stopper movably provided on the circular saw blade cover and the cutting depth stopper. A contact portion provided on the side, a display portion for displaying a cutting depth corresponding to the moving position of the cutting depth stopper, and a stopper locking mechanism for locking the cutting depth stopper to the circular saw blade cover. In addition, the setting of the cutting depth becomes easy, and high reliability is obtained.

As set forth in claim 10, the display unit includes:
A first scale indicating a cutting depth by the circular saw blade when the circular saw blade is held at a right angle to the base, and a cut by the circular saw blade when the circular saw blade is tilted to the maximum with respect to the base. By providing the second scale indicating the depth, a preset depth of cut can be easily and reliably obtained in any of the right-angle cutting and the inclined cutting.

According to an eleventh aspect of the present invention, when the circular saw blade is housed in the circular saw blade cover, unit drive means for locking the drive unit to the circular saw blade cover is further provided. Even when an external force acts on the unit, it is possible to prevent the drive unit from erroneously moving and the circular saw blade from protruding from the lower surface of the base.

According to a twelfth aspect, the unit locking means engages with the engaging portion provided on the circular saw blade cover and the engaging portion when the drive unit is placed in an unused state. As described above, a lock member slidably provided in the drive unit and having a hemispherical tip, and an elastic member for urging the lock member to elastically project the hemispherical tip toward the circular saw blade cover side. When the unit lock means is placed in the lockable state, only the drive unit is moved, and when the drive unit reaches a predetermined position, the tip of the lock member is engaged with the engagement portion of the circular saw blade cover. Automatically engaged with the vehicle, ensuring safety.

According to a thirteenth aspect, the lock member has an L-shaped operation part, and the lock member is held in the unlocked state by rotating the operation part in one direction. If the lock member is configured to be held in the lockable state by the rotation in the opposite direction of the above, any one of the unlocked state and the lockable state can be performed without complicating the structure of the unit locking means. Can be provided stably.

[Brief description of the drawings]

FIG. 1 is a front view of a circular saw of the present invention in which a circular saw blade is held at a right angle to a base and is stored.

FIG. 2 is a front view of the circular saw of the present invention with the circular saw blade held at right angles to the base and in use.

FIG. 3 is a right side view of the circular saw shown in FIG. 1;

FIG. 4 is a right side view of the circular saw shown in FIG. 2;

FIG. 5 is a rear view of the circular saw shown in FIG. 1;

FIG. 6 is a rear view of the circular saw shown in FIG. 2;

FIG. 7 is a left side view of the circular saw of the present invention in which the circular saw blade is tilted at a maximum tilt angle with respect to the base and is placed in a stored state.

FIG. 8 is a right side view of the circular saw of the present invention in which the circular saw blade is tilted at a maximum tilt angle with respect to the base and placed in use.

FIG. 9 is a diagram showing a state in which a material to be cut is cut using the circular saw shown in FIG. 8;

FIG. 10 is a front view showing a display unit of a cutting depth adjusting means in the circular saw of the present invention.

FIG. 11 is a front view of the circular saw of the present invention with the circular saw blade in a stowed condition and with a different base.

FIG. 12 is a front view of the circular saw of the present invention with the circular saw blade in use and with a different base;

FIG. 13 is a right side view of the circular saw shown in FIG. 11;

14 is a right front view of the circular saw shown in FIG.

FIG. 15 is a left side view of the circular saw shown in FIG. 11;

16 is a left side view showing a state where the drive unit is locked to the circular saw blade cover in the circular saw shown in FIG. 15;

FIG. 17 is a plan view of the circular saw shown in FIG. 15;

FIG. 18 is a rear view of the circular saw shown in FIG. 15;

FIG. 19 is an enlarged side view showing a unit locking means in the circular saw shown in FIG. 15;

FIG. 20 is an enlarged plan view of the unit locking means shown in FIG. 19;

FIG. 21 is a right side view of the circular saw according to the second embodiment of the present invention.

FIG. 22 is a rear view of the circular saw shown in FIG. 21 in a housed state;

FIG. 23 is a rear view of the circular saw shown in FIG. 21 in a state of use;

FIG. 24 is an explanatory view of a unit locking means of the circular saw shown in FIG. 21, (A) shows a state immediately before locking,
(B) is a partially enlarged view of (A).

FIG. 25 is an explanatory view of the operation of the unit locking means of the circular saw shown in FIG. 21;

FIG. 26 is a right side view of the circular saw according to the third embodiment of the present invention.

FIG. 27 is a rear view of the circular saw shown in FIG. 26;

[Explanation of symbols]

 B Base 1a Bottom surface 1b Opening SC Circular saw blade cover 7a Engagement portion P1 First reference surface P2 Second reference surface DU Drive unit 13 Output shaft S Circular saw blade CL Incline lock means AR Angle regulating means CM Cutting material CA Cutting depth Adjusting means 18 Cutting depth stopper 19 Contact part 20 Display part 20a First scale 20b Second scale 21 Stopper lock mechanism UL unit lock means 23 Lock member 23a Tip 23b Operation part 24 Elastic member

Claims (13)

[Claims] 1. A base mounted on a material to be cut, and is tiltably connected to the base along a first reference plane orthogonal to a bottom surface of the base, and a center axis is defined by the first reference plane. A circular saw having a drive unit having an output shaft parallel to the circular saw blade, a circular saw blade attached to the output shaft of the drive unit, and a circular saw blade cover covering the circular saw blade. Has a size to cover substantially the entire circular saw blade, has an opening on the base side, and is connected to the base so as to be tiltable along the first reference plane. The drive unit is tiltable along the first reference plane, and is movable with respect to the base along a second reference plane corresponding to a plane of the circular saw blade; The circular saw blade according to the amount of movement of the Circular saw, characterized in that the infested from the opening of the circular saw blade cover. 2. The circular saw according to claim 1, wherein the movement of the drive unit is a rotation about a single support shaft. 3. The circular saw according to claim 1, further comprising an inclined locking means for locking the circular saw blade cover to the base. 4. The apparatus according to claim 1, further comprising elastic holding means for applying a pressing force to the drive unit so as to hold the circular saw blade housed in the circular saw blade cover. A circular saw according to any one of claims 1 to 3. 5. The front end of the base, wherein the circular saw blade cover is connected to a front end of the base, and the circular saw blade is held at right angles to the base. The circular saw according to any one of claims 1 to 4, wherein the portion is located forward of other members. 6. In a state where the circular saw blade is tilted to the maximum with respect to the base, the lowermost end of the circular saw blade protruding from the opening of the circular saw blade cover is the front end of the base. The circular saw according to claim 5, wherein the circular saw is located forward of the portion. 7. The circular saw according to claim 1, further comprising an angle restricting means for restricting a maximum inclination angle of the circular saw blade with respect to the base. . 8. A notch depth adjusting means for adjusting a movement limit position of the drive unit toward the base so as to adjust the amount of protrusion of the circular saw blade from a lower surface of the base. The circular saw according to any one of claims 1 to 7, wherein: 9. The notch depth adjusting means is provided on the drive unit side so as to be able to contact the notch depth stopper movably provided on the circular saw blade cover and the notch depth stopper. A contact portion, a display portion for displaying a cutting depth corresponding to a moving position of the cutting depth stopper, and a stopper lock mechanism for locking the cutting depth stopper to the circular saw blade cover. The circular saw according to claim 8, wherein the circular saw is provided. 10. The display unit includes: a first scale indicating a cutting depth of the circular saw blade when the circular saw blade is held at a right angle to the base; The circular saw according to claim 9, further comprising a second scale indicating a cutting depth by the circular saw blade in a state where the circular saw is inclined to the maximum. 11. The apparatus according to claim 11, further comprising a unit locking means for locking the drive unit to the circular saw blade cover when the circular saw blade is housed in the circular saw blade cover. A circular saw according to any one of claims 1 to 10. 12. The unit locking means includes: an engagement portion provided on the circular saw blade cover; and an engagement portion that engages with the engagement portion when the drive unit is placed in an unused state. A lock member slidably provided on the drive unit and having a hemispherical tip, and an elastic member for urging the lock member to elastically project the hemispherical tip toward the circular saw blade cover. The circular saw according to claim 11, comprising: 13. The lock member has an L-shaped operation portion, and the lock member is held in an unlocked state by rotation of the operation portion in one direction, and is opposite to the operation portion. The circular saw according to claim 12, wherein the lock member is held in a lockable state by turning in the direction.