JP3698954B2 - Portable power cutting machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a portable power cutting machine operated by human power, and more particularly to a portable power cutting machine suitable for so-called cutting for cutting a floor material along a wall.
[0002]
[Prior art]
Conventionally, when the above-mentioned cutting operation is carried out using a general right-angled portable electric circular saw in which a saw blade is arranged at a right angle with respect to a surface plate, for example, for changing the flooring of a house. In a state where the entire circular saw is inclined so that the surface plate does not get in the way, the saw blade is cut obliquely into the flooring material near the wall, and then the entire circular saw is moved along the wall. However, such a cutting operation cannot be performed in a state where the surface plate is in contact with the floor surface, and thus the operation is performed in an extremely unstable state, and is practically impossible.
For this reason, there has been proposed a modification of the electric circular saw for right-angle cutting that enables cutting. Such a portable electric circular saw is described in, for example, Japanese Patent Publication No. 2933196.
In short, the portable electric circular saw described in the above publication is mounted so that the circular saw body can be adjusted to move up and down and the tilt angle can be adjusted with respect to the surface plate, so that the motor housing does not interfere with the surface plate when cut off. By moving the saw blade upward in advance and fixing it, tilt the circular saw body so that the cutting edge of the saw blade protrudes outward from the side edge opposite to the motor on the surface plate. It can be used as a slice.
[0003]
[Problems to be solved by the invention]
However, in the portable electric circular saw described in the above publication, since the tilt axis for adjusting the tilt angle of the saw blade is set on a stand member standing on the surface plate, the saw is changed as the tilt angle changes. The cutting tip position of the blade changes. That is, there is a problem that the usability is poor because the cutting start position of the saw blade with respect to the surface plate is not specified.
[0004]
The present invention has been made in view of the above-described conventional problems, and the object thereof is to maintain the cutting start position of the saw blade at a constant position regardless of the change in the inclination angle of the saw blade. An object of the present invention is to provide a portable power cutting machine suitable for cutting work.
[0005]
In order to achieve the above object, a portable power cutting machine according to the present invention has a configuration as described in each claim.
Therefore, according to the first aspect of the present invention, when the cutting machine body is set to the surface plate so that the saw blade is orthogonal to the sliding surface of the surface plate, normal right angle cutting is possible. Yes, and when the saw blade is moved downward, the cutting tip of the saw blade is set so as to protrude outward from the side edge opposite to the motor on the surface plate. The floor material can be cut along the wall, so-called cutting.
In this case, the mounting angle of the cutting machine main body with respect to the surface plate can be adjusted with the intersecting line between the extended surface of the sliding surface of the surface plate and the surface in the cutting direction of the saw blade as the tilt axis, Even if changes, the cutting edge of the saw blade always passes on the tilting axis during the cutting operation. That is, regardless of the inclination angle of the saw blade, the cutting start position of the saw blade with respect to the surface plate is held at a fixed position. Therefore, positioning in performing the cutting operation is facilitated, and usability is improved.
[0006]
Further , there is no trouble in positioning the portable circular saw at the time of cutting, and the usability is improved.
2. The motor according to claim 1, wherein the motor has a rotation axis in a direction in which a head side is lower than a bottom side with respect to a cutting direction of the saw blade when the motor is at a right angle to the surface plate. It can be set as the structure arrange | positioned in the state which inclined. According to this configuration, by the time the saw blade is at right angles state, the head side (output side) is placed by tilting the motor so that the lower side of the bottom side of the platen, when cut When the cutting machine body is tilted toward the surface plate for work, interference of the motor housing with the surface plate can be avoided. For this reason, it becomes possible to arrange the cutting machine main body as close as possible to the surface plate, and the overall height can be suppressed and downsizing can be achieved.
[0007]
According to the second aspect of the present invention, the mounting angle adjusting means of the cutting machine main body includes an arcuate guide hole and a slide member that relatively moves along the guide hole, thereby simplifying the operation. A mounting angle adjusting means for the structure can be provided.
According to the third aspect of the present invention, it is possible to avoid interference of the electric motor with respect to the surface plate when the cutting edge of the saw blade is inclined in a direction protruding from the end of the surface plate for the purpose of cutting. Work can be done.
According to the invention of claim 4 , when the cutting operation is not actually performed, the saw blade is stored in the blade case, and when the cutting operation is actually performed, a part of the saw blade is removed from the blade case. Can be exposed and cut. For this reason, it is not necessary to attach a safety cover as described in Japanese Patent No. 2933196, the mechanism can be simplified and the length of the rotating shaft can be shortened, and the width of the blade case is reduced. It is possible to provide a portable power cutting machine that does not hinder cutting work.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The portable power cutting machine according to the present embodiment is intended for portable electric circular saws. FIG. 1 is a side view of the portable electric circular saw cut at right angles, and FIG. 3 is a plan view, and FIG. 4 is a longitudinal sectional view. 5 is a front view showing a state where the circular saw is lowered for the cutting operation, FIG. 6 is a side sectional view at the time of cutting, and FIGS. 7 and 8 are sectional views showing an actual cutting operation mode.
[0009]
As shown in FIGS. 1 to 4, the portable electric circular saw has a substantially rectangular plate-shaped surface plate 1 that is placed on a cutting material during a cutting operation, and a circular saw body 4 to which a saw blade 3 that is rotated by an electric motor 2 is attached. The circular saw body 4 is arranged on the upper surface side of the surface plate 1. The circular saw body 4 corresponds to the cutting machine body of the present invention.
As shown in FIG. 4, one side end of the surface plate 1, that is, the front and rear ends of the end opposite to the motor 2 (left side in FIG. 1) is located upward from a position protruding forward by a predetermined length. A moving guide 1a standing at right angles to the wall is provided, and this moving guide 1a is in contact with the wall surface in order to guide the portable electric circular saw straight along the wall surface in the room during the cutting operation. Used in
The saw blade 3 is disposed between the left and right moving guides 1a. That is, it is arranged so that it can move up and down through the outside of the end of the surface plate 1, and the cut surface (surface direction) is relative to the sliding surface of the surface plate 1 (the lower surface on the cutting material). In the right-angle state, the side surface thereof coincides with the side surface of the moving guide 1a (see FIGS. 1 and 4).
[0010]
A blade case 5 having an open lower portion for covering the saw blade 3 is disposed above the side end of the surface plate 1 (left side in FIGS. 1 and 4), and above the surface plate 1 side of the blade case 5. The circular saw body 4 is attached. A mounting portion 6 that protrudes toward the motor is formed at the front and rear lower portions of the wall plate 5a on the motor side in the blade case 5, and arc-shaped projections 6a as slide members provided on the outer surface side of the mounting portion 6 are front and rear. The arcuate guide holes 7a formed in the pair of support plates 7 are slidably fitted in a non-rotating state. The support plate 7 is formed in an L shape and is fixed to the surface plate 1 with a countersunk screw 7b (see FIG. 5).
The guide hole 7a is formed over a range of approximately 90 degrees, and the arc shape thereof intersects the extended surface of the sliding surface of the surface plate 1 and the surface in the cutting direction of the saw blade 3 (width direction center line). The radius of curvature is set around the line P (see FIGS. 1 and 4).
[0011]
Accordingly, the blade case 5 and the circular saw body 4 attached thereto are cut from the state in which the saw blade 3 is perpendicular to the surface plate 1 with the intersecting line P as the tilt axis with respect to the surface plate 1. The insertion tip side can be tilted to the upper surface side of the surface plate 1 that is displaced to the side of the surface plate 1. That is, the circular saw body 4 is attached so as to be tiltable so that the cutting direction (tilt angle) of the saw blade 3 can be adjusted, and the main body 4 is formed by a guide hole 7a and a projection 6a that moves along the guide hole 7a. The mounting angle adjusting means of the invention is configured.
In the present embodiment, the cutting direction of the saw blade 3 is perpendicular to the sliding surface of the surface plate 1 and the inclined state in which the maximum inclination angle for cutting is about 45 degrees. It is set so that it can be adjusted between them, and can be fixed to the adjustment position by a thumbscrew 8. The thumbscrew 8 is movable along an intersection line P provided on the support plate 7, that is, along an arc-shaped escape hole 7 c centering on the tilt axis of the circular saw body 4.
[0012]
The circular saw body 4 disposed on the rear surface side of the blade case 5 is attached to the blade case 5 so as to be movable up and down. Specifically, as shown in FIGS. 2 and 3, a gear box 10 is fixed to the head side (output side) of the motor housing 9 of the electric motor 2, and the extension arm is extended laterally from the gear box 10. The part 10a is attached to the lower part of the wall plate 5a of the blade case 5 by a pivot pin 11 so as to be rotatable in the vertical direction. The turning operation is performed using an operation handle 12 provided integrally with the motor housing 9 of the electric motor 2.
[0013]
The wall plate 5a of the blade case 5 is formed with an opening 14 for allowing the rotary shaft 13 of the saw blade 3 extending in the blade case 5 to move up and down across the wall plate 5a. Yes. The circular saw body 4 is urged upward by a compression spring 15 interposed between the upper surface of the surface plate 1 and the extension arm portion 10a of the gear box 10 as shown in FIG. The upper edge stopper 16 (see FIG. 4) that can abut on the upper edge of the blade is held in a raised position (stored position), and the saw blade 3 is stored in the blade case 5 at this position (see FIG. 1). .
[0014]
As shown in FIG. 4, one end of the rotating shaft 13 extends into the blade case 5, and an end thereof includes an inner flange 17 and an outer flange 18 fastened to the inner flange 17 by a bolt 19. A saw blade mounting tool is provided, and the saw blade 3 is detachably mounted with both flanges 17 and 18 sandwiched from both the left and right sides. In addition, both the flanges 17 and 18 are made into the fitting structure by two-plane width with respect to the rotating shaft 13, and are integrated in the rotation direction.
The rotating shaft 13 is rotatably supported in the gear box 10 via two left and right bearings 20 and 21, and an outer ring cover 23 that holds the outer ring is fixed to the left surface of the bearing holder 22 that receives the bearing 20 on the left side in the figure. Has been. The upper end stopper 16 is formed by projecting the upper end portion of the outer ring cover 23 forward.
[0015]
As shown in FIGS. 1 and 4, when the saw blade 3 is in a right angle cutting state, the electric motor 2 has its rotation axis, that is, the axis of the output shaft 24, with respect to the axis of the rotation shaft 13 of the saw blade 3. The head side (output side) is inclined at a predetermined angle (approximately 30 degrees in the present embodiment) so as to be lower than the bottom side. Thus, the electric motor 2 is inclined with respect to the rotation axis of the saw blade 3, so that when the cutting direction of the saw blade 3 is perpendicular to the surface plate 1, the bottom side is It becomes a posture that is flipped upward, and is greatly separated from the upper surface of the surface plate 1.
In order to cope with such an arrangement, as shown in FIG. 4, a bevel gear 25 as a driven gear is fixed to the rotary shaft 13 via a half-moon key 26, and the bevel gear 25 is attached to the electric motor 2. A driving pinion gear 27 formed at the tip of the output shaft 24 is engaged.
[0016]
The portable electric circular saw according to the present embodiment is configured as described above. Accordingly, as shown in FIGS. 1 to 4, in a state in which the cutting direction of the saw blade 3 is perpendicular to the sliding surface of the surface plate 1, after placing the surface plate 1 on the cutting material, By operating the circular saw body 4 downward with the pivot pin 11 as a pivot point, the saw blade 3 is moved downward through the outside of the side edge of the surface plate 1 as shown in FIG. The material can be cut with a normal right angle cut.
[0017]
Next, a description will be given of a cutting operation for cutting the floor material W <b> 1 along the wall for a floor replacement operation or the like. In this case, the blade screw 8 is loosened, and the blade case 5 and the circular saw body 4 are tilted along the guide holes 7 a of the support plate 7, so that the cutting direction of the saw blade 3 is tilted with respect to the surface plate 1. . After tilting, the thumbscrew 8 is tightened to fix the tilted posture. With this inclination, as shown in FIG. 6, the rotation axis of the electric motor 2 becomes parallel to the surface plate 1 and the motor housing 9 approaches the surface plate 1 and comes closest when the maximum inclination is 45 degrees. .
[0018]
As shown in FIGS. 7 and 8, the portable electric circular saw inclined as described above is brought into contact with the wall surface W2 with the moving guide 1a provided at the side end of the surface plate 1, and the circular saw body in this state. When the lowering operation 4 is performed, the saw blade 3 is lowered in the inclination direction and cut into the floor material W1. Accordingly, the cutting state of the saw blade 3 is maintained thereafter, and the entire portable electric circular saw for each surface plate 1 is slid along the wall surface W1 while pressing the moving guide 1a against the wall surface W2. The cutting work of the flooring W1 along the wall, that is, the cutting can be performed. Note that the maximum depth of cut at this time is regulated by the motor housing 9 coming into contact with the upper surface of the surface plate 1.
[0019]
In the present embodiment, the tilt angle of the circular saw body 4 can be adjusted with the intersection line P between the extended surface of the sliding surface of the surface plate 1 and the surface in the cutting direction of the saw blade 3 as the tilt axis. Therefore, the cutting tip of the saw blade 3 always passes on the tilt axis regardless of the tilt angle. That is, the cutting start position of the saw blade 3 is always held at a fixed position regardless of the inclination angle of the saw blade 3. Therefore, in the state where the moving guide 1a is in contact with the wall surface W2, the cutting start position of the saw blade 3 is always the intersection of the wall surface W2 and the floor surface W1, so that the positioning operation of the portable circular saw at the time of cutting is performed. The ease of use is improved.
FIG. 7 shows a case where the floor material W1 is thick, and FIG. 8 shows a case where the floor material W1 is thin. When the floor material W1 is thick, if the inclination angle with respect to the surface plate 1 is increased as in the case where the floor material W1 is thin, the cutting tip of the saw blade 3 penetrates the floor material W1 and reaches the fixed tree W3, as indicated by a virtual line, There is a risk of hurting this. For this reason, the damage problem of the fixed tree W3 as described above can be solved by adjusting the inclination angle as the floor material W1 becomes thicker and performing the cutting operation.
[0020]
Further, according to the present embodiment, the rotational axis of the electric motor 2 is set so that the head side faces downward with the rotational axis of the saw blade 3 perpendicular to the rotational axis of the saw blade 3. Interference of the electric motor 2 with the surface plate 1 when the cutting side of the saw blade 3 inclines in a direction protruding from the end of the surface plate 1 for cutting can be performed when desired.
[0021]
In addition, the mounting angle of the circular saw body 4 with respect to the surface plate 1 can be adjusted, so that the normal cutting with the saw blade 3 at a right angle and the cutting with the saw blade 3 in an inclined posture are performed. In this case, the operation for switching the form from the cutting to the right angle or from the right angle to the cutting is performed by loosening the thumbscrew 8 and tilting the circular saw body 4 with respect to the blade case 5. It is very easy to change only.
[0022]
Further, when the cutting operation is not actually performed, the saw blade 3 is stored in the blade case 5, and when the cutting operation is actually performed, a part of the saw blade 3 can be exposed from the blade case 5 and cut. Therefore, it is not necessary to attach a safety cover as described in Japanese Patent Publication No. 2933196, the mechanism can be simplified and the length of the rotating shaft can be shortened, and the width of the blade case is reduced. It is possible to provide a portable power cutting machine that does not hinder cutting work.
[0023]
In the above-described embodiment, the electric motor 2 is disposed with its head side facing downward so that the rotation axis of the electric motor 2 is inclined with respect to the rotation axis of the saw blade 3, so as to cut off. Although the interference of the motor housing 9 with the surface plate 1 when the saw blade 3 is inclined is avoided, it is also possible to change to the right angle arrangement as shown in the schematic diagram of FIG. .
In another embodiment shown in FIG. 9, the electric motor 2 has its head side facing downward, and its rotation axis is orthogonal to the rotation axis of the saw blade 3 (parallel to the cutting direction of the saw blade 3). ing. At this time, it is effective to use two bevel gears 31 and 32 for driving and for driving having a 45 degree inclination as means for transmitting the rotation of the output shaft of the electric motor 2 to the rotating shaft of the saw blade 3. In addition, about structures other than said orthogonal arrangement | positioning regarding other embodiment, it is comprised similarly to embodiment mentioned above, and the same code | symbol is attached | subjected about the structural member shown by the figure at least.
[0024]
In the present embodiment, a guide hole 7a as a means for adjusting the mounting angle of the circular saw body 4 is provided in the support plate 7 on the surface plate 1 side, and the protrusion 6a that slides along the guide hole 7a is round. Although it is provided on the saw body 4 side, the setting portion may be reversed. Further, although the movement guide 1a is formed integrally with the surface plate 1, it may be formed separately.
[0025]
【The invention's effect】
As described above in detail, according to the present invention, the cutting start position of the saw blade can be held at a constant position regardless of the change in the inclination angle of the saw blade, so that the cutting operation can be performed efficiently. An easy-to-use portable power cutting machine can be provided.
[Brief description of the drawings]
FIG. 1 is a side view of a portable electric circular saw cut at right angles.
FIG. 2 is a front view of the same.
FIG. 3 is also a plan view.
FIG. 4 is also a longitudinal sectional view.
FIG. 5 is a front view of a state where a circular saw is lowered for a cutting operation.
FIG. 6 is a side sectional view at the time of cutting.
FIG. 7 is a cross-sectional view showing an actual cutting operation mode, in which a thin floor material is cut.
FIG. 8 is a cross-sectional view showing an actual cutting operation mode, in which a thick flooring is cut.
FIG. 9 is a schematic diagram for explaining another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Surface plate 2 ... Electric motor 3 ... Saw blade 4 ... Circular saw body 5 ... Blade case 9 ... Motor housing 13 ... Rotating shaft 24 ... Output shaft

Claims (4)

A portable power cutting machine comprising a surface plate having a sliding surface slidable along a workpiece to be cut, and a cutting machine body having a saw blade for cutting and a motor for driving the saw blade. ,
The cutting machine body is capable of moving the saw blade up and down with respect to the surface plate through the outside of the surface plate, and the saw blade with respect to an extension surface of the sliding surface of the surface plate. Are supported by the surface plate in a state that can be tilted to a position that is orthogonal to the position that is inclined,
The tilting axis of the cutting machine body with respect to the surface plate is made coincident with the line of intersection of the cutting direction of the saw blade and the extended surface, and the cutting of the saw blade starts regardless of the inclined position of the cutting machine body Holding the position on the tilt axis ,
When the saw blade is perpendicular to the extension surface, the side edge of the surface plate is opposite to the motor, and the side surface is aligned with the side surface of the saw blade. Provide a moving guide that stands up at a right angle,
When the moving guide is brought into contact with a wall surface that is positioned at right angles to the floor surface as the workpiece, the tilt axis is set at the intersection line of the contact surface of the moving guide and the sliding surface. A portable power cutting machine in which the cutting start position of the saw blade is held at the intersection of the floor surface and the wall surface regardless of the inclination position of the cutting machine body . The portable power cutting machine according to claim 1 , wherein the tilt axis is provided on one of the surface plate and the cutting machine body as a mounting angle adjustment unit of the cutting machine body with respect to the surface plate. A guide hole formed in a circular arc shape at the center is provided, and the other is provided with a slide member that engages with the guide hole so as to be able to move relative to the guide hole. Power cutting machine. A portable power cutting machine according to claim 1 or 2 ,
The rotation axis of the motor is inclined with respect to the rotation axis to which the saw blade is attached, and the bottom side of the motor is inclined in a direction higher than the head side when the saw blade is positioned at a right angle. Portable power cutting machine. The portable power cutting machine according to any one of claims 1 to 3 , wherein the cutting machine body is vertically movable with respect to a blade case as a saw blade cover attached to the surface plate. A portable power cutting machine characterized by being attached.

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