JP2004330655A - Portable electrical cutting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable electrical circular saw which is capable of restraining the dispersion of a maximum cut depth and effectively setting the cut depth when the angle of a saw blade side with the bottom surface of a base is tilted, and thus reduces the dispersion of the maximum ejection of the saw blade. <P>SOLUTION: In this electrical cutting machine, the lower end part (the lower end of the ejection part) on the rear side, in the cutting direction, of a saw cover 3 can come into contact with the upper part of a retaining part 16 provided on the upper surface of the base 4 for retaining an inclined supporting point member 10, when a pivoting action takes place using a pivoting axis member 5 as a supporting point. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a portable electric cutting machine (hereinafter, referred to as a portable electric circular saw) capable of adjusting a protruding amount of a saw blade from a base bottom surface and adjusting an angle of a saw blade side surface with respect to the base bottom surface.
[0002]
[Prior art]
An example of a conventional portable electric circular saw will be described below with reference to FIGS. 1 and 7 to 11.
[0003]
FIG. 1 is a perspective view showing an example of a portable electric circular saw, FIG. 7 is a left side view showing an example of a conventional portable electric circular saw, and FIG. 8 is a front view showing an example of a conventional portable electric circular saw. FIG. 9 is an enlarged view of a portion E in FIG. 8, and FIG. 10 is a portable electric circular saw shown in FIG. 7, in which the base and the housing are rotated relative to each other, and the angle of the saw blade side with respect to the base bottom is inclined. FIG. 11 is a vertical cross-sectional view of FIG.
[0004]
The portable electric circular saw has a housing 1 for accommodating a motor (not shown), a saw blade 2 rotationally driven by the motor 1, and a shape that is attached to the housing 1 and covers substantially the upper half of the outer periphery of the saw blade 2. A saw cover 3 having a saw blade storage portion 3a for storing a part of the blade 2, a bottom surface 4a connected to the housing 1 and slidable on the material to be cut, and protruding the saw blade 2 downward from the bottom surface 4a. And a base 4 having a possible opening 4b.
[0005]
A turning shaft member 5 inserted into a hole (not shown) provided near an end of the saw cover 3 in the cutting direction front side (right side in FIG. 1), a hinge holding portion 6 for holding the turning shaft member 5, and a base 4 The saw cover 3 is connected to the base 4 on the front side in the cutting direction via a pin 7 which is a rotation fulcrum member held by the holding portion 15 protruding upward and connected to the hinge holding portion 6 so as to be relatively rotatable. . On the rear side in the cutting direction (the left side in FIG. 1), the upper end is housed in the saw blade housing part 3a, and the positional relationship with the saw cover 3 is determined by bolts 8 provided on the saw cover 3 so as to be relatively movable with the saw cover 3. The saw cover 3 and the base 4 are connected to each other via a fixed link 9 and a pin 10 which is a rotation fulcrum member held by a holding portion 16 protruding above the base 4 and connected to the link 9 so as to be relatively rotatable. ing.
[0006]
As described above, the saw cover 3 and the base 4 are connected before and after the saw blade 2 in the cutting direction, and the base 3 and the housing 1 are connected via the saw cover 3.
[0007]
The link 9 has an elongated hole 9a, and the bolt 8 provided on the saw cover 3 is inserted into the elongated hole 9a. By loosening the bolts 8, the saw cover 3 and the base 4 can be relatively rotated about the rotation shaft member 5 as a fulcrum, and the amount of protrusion of the saw blade 2 protruding from the bottom surface 4 a of the base 4, that is, The depth of cut can be adjusted.
[0008]
In the vicinity of the hinge holding portion 6, a bevel plate 11 having an arc-shaped long hole 11a centering on the pin 7 is provided on the base 4 so as to be attached to the hinge holding portion 6 in the long hole 11a. Bolt 12 is inserted, and by tightening the bolt 12, the positional relationship between the hinge holding portion 6 and the bevel plate 11 can be fixed. By loosening the bolt 12, the saw cover 3 and the base 4 can be rotated relatively with the pins 7 and 9 serving as rotation fulcrum members as fulcrums, and the angle of the side surface of the saw blade 4 with respect to the bottom surface 4a of the base 4 can be adjusted.
[0009]
The state shown in FIG. 7 is a state in which the cutting depth is set to the maximum cutting depth H1, that is, the bolt 8 is loosened, and the saw cover 2 and the base 4 are connected to the saw cover 2 and the base 4 with the pivot shaft member 5 as a fulcrum. In this state, the saw blade 2 is rotated to the maximum extent in the direction protruding from the base 4. This was performed by the bolt 8 contacting the lower end of the side.
[0010]
[Problems to be solved by the invention]
As described above, in the conventional portable electric circular saw, the maximum cutting depth H1 is determined by the contact of the bolt 8 with a part of the link 9, but in the case of such a configuration, the saw blade 7 to 10, the maximum protrusion amount 2 is a dimension a from the bottom surface 4 a of the base 4 to the center of the pin 10, an inner diameter φc of the holding hole 16 a of the holding portion 16 for holding the pin 10, The outer diameter dimension φb of the pin 10 in the hole 16a, the outer diameter dimension d of the pin 10 at the connection part with the link 9, the inner diameter dimension e of the link 9 at the connection part with the pin 10, the length of the link 9 from the center of the pin 10 Determined by the dimension f of the hole 9a to the lower end of the base 4 side, the inner diameter φh of the holding hole 3b for holding the bolt 8 provided on the saw cover 3, the outer diameter φg of the bolt 8, the outer diameter φj of the saw blade 2, and the like. Is to be To come include simultaneous variation of these components was achieved, variation occurs in the maximum projection amount H1 of the saw blade 2.
[0011]
In addition, as shown in FIGS. 10 and 11, when the angle of the side surface of the saw blade 2 with respect to the bottom surface 4a of the base 4 is inclined so as to be θ, the gap between the upper surface of the base 2 and other components on the housing 1 side δ2 expands to δ2 ′, and the cutting depth H2 can be further increased. However, as in the case of the right angle, the lower end of the elongated hole 9a of the link 9 on the base 4 side is in contact with the bolt 8, so that the cutting is performed. The depth could not be increased.
[0012]
Further, as shown in FIGS. 12 to 14, the cutting position when the saw blade 2 is at 90 ° with respect to the bottom surface of the base 4 and at the 45 ° inclination which is most frequently used in the inclined cutting of the portable cutting machine. In the case of a portable electric circular saw in which the tilt fulcrum position is set so that the saw blade 2 is at the same position, if the saw blade 2 is inclined, the saw cover 3 and the base 4 come into contact as shown in FIG. As shown in the figure, the operator adjusts the tilt angle while relatively rotating the saw cover 3 and the base 4 with the rotation shaft member 5 as a fulcrum in a direction to reduce the cutting depth so that the housing 1 and the base 4 do not contact each other. Had to do.
[0013]
An object of the present invention is to provide a portable electric circular saw capable of solving the above-mentioned drawbacks and suppressing the variation of the maximum cutting depth.
[0014]
Another object of the present invention is to provide a portable electric circular saw capable of effectively setting a cutting depth when an angle of a saw blade side surface with respect to a base bottom surface is inclined.
[0015]
[Means for Solving the Problems]
The above object is achieved by allowing the lower end of the saw cover in the cutting direction rearward to be able to abut above a holding portion provided on the upper surface of the base for holding the inclined fulcrum member when the saw cover is rotated about the fulcrum. Is done.
[0016]
Here, it is preferable to provide a protruding portion that protrudes toward the base at the lower end on the rear side in the cutting direction of the saw cover.
[0017]
Further, the base is preferably made of aluminum.
[0018]
In addition, when the angle of the saw blade side surface with respect to the base bottom surface of the holding portion is a right angle, the angle of the first outer shape portion with which the lower end portion on the rear side in the cutting direction of the saw cover can contact, and the angle of the saw blade side surface with respect to the base bottom surface are maximum. It is preferable that the shape be different in distance from the center of the inclined fulcrum to the second outer portion to which the lower end on the cutting direction rear side of the saw cover can abut when inclined.
[0019]
Further, it is preferable that the second outer portion of the holding portion has a shape smaller in distance from the center of the inclined fulcrum than the first outer portion.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment of the portable electric circular saw of the present invention will be described below with reference to FIGS.
[0021]
The portable electric circular saw has a housing 1 for accommodating a motor (not shown), a saw blade 2 rotationally driven by the motor 1, and a shape that is attached to the housing 1 and covers substantially the upper half of the outer periphery of the saw blade 2. A saw cover 3 having a saw blade storage portion 3a for storing a part of the blade 2, a bottom surface 4a connected to the housing 1 and slidable on the material to be cut, and protruding the saw blade 2 downward from the bottom surface 4a. And a base 4 having a possible opening 4b.
[0022]
A turning shaft member 5 inserted into a hole (not shown) provided near an end of the saw cover 3 in the cutting direction front side (right side in FIG. 1), a hinge holding portion 6 for holding the turning shaft member 5, and a base 4 The saw cover 3 is connected to the base 4 on the front side in the cutting direction via a pin 7 which is a rotation fulcrum member held by the holding portion 15 protruding upward and connected to the hinge holding portion 6 so as to be relatively rotatable. .
[0023]
Note that the rotation shaft member 5 is disposed so as to extend substantially parallel to the rotation shaft of the saw blade 2.
[0024]
On the rear side in the cutting direction (the left side in FIG. 1), the upper end is housed in the saw blade housing part 3a, and the positional relationship with the saw cover 3 is determined by bolts 8 provided on the saw cover 3 so as to be relatively movable with the saw cover 3. The saw cover 3 and the base 4 are connected to each other via a fixed link 9 and a pin 10 which is a rotation fulcrum member held by a holding portion 16 protruding above the base 4 and connected to the link 9 so as to be relatively rotatable. ing. As described above, the saw cover 3 and the base 4 are connected before and after the saw blade 2 in the cutting direction, and the base 3 and the housing 1 are connected via the saw cover 3.
[0025]
The link 9 has an elongated hole 9a, and the bolt 8 provided on the saw cover 3 is inserted into the elongated hole 9a. By loosening the bolts 8, the saw cover 3 and the base 4 can be relatively rotated about the rotation shaft member 5 as a fulcrum, and the amount of protrusion of the saw blade 2 protruding from the bottom surface 4 a of the base 4, that is, The depth of cut can be adjusted.
[0026]
In the vicinity of the hinge holding portion 6, a bevel plate 11 having an arc-shaped long hole 11a centering on the pin 7 is provided on the base 4 so as to be attached to the hinge holding portion 6 in the long hole 11a. The bolt 12 is inserted, and the positional relationship between the hinge holding portion 6 and the bevel plate 11 can be fixed by tightening the bolt 12.
[0027]
In the vicinity of the link 9, a bevel plate 13 having an arc-shaped elongated hole 13 a centered on the pin 10 is protruded from the base 4, and a bolt attached to the link 9 is provided in the elongated hole 13 a. 14 is inserted, and the positional relationship between the link 9 and the bevel plate 13 can be fixed by tightening the bolt 14.
[0028]
By loosening the bolts 12 and 14, the saw cover 3 and the base 4 can be rotated relative to each other with the pins 7 and 9 serving as rotation fulcrum members as fulcrums, and the side surface of the saw blade 4 with respect to the bottom surface 4 a of the base 4. The angle can be adjusted.
[0029]
As in the present embodiment, the bevel plates 11 and 13 are provided on the base 4 before and after the cutting direction with the saw blade 2 interposed therebetween, so that the saw for the base 4 bottom surface 4a set by the load applied to the main body and the like is provided. Deviation of the angle of the side surface of the blade 2 can be suppressed.
[0030]
The base 4 of the present embodiment is made of aluminum, is less deformed and has higher strength than a steel plate base, and can improve the surface accuracy by machining. It is a portable electric circular saw suitable for work.
[0031]
As shown in FIG. 2, a protruding portion 3 c protruding downward in the drawing toward the base 4 is provided at a lower end of the saw cover 3 on the rear side in the cutting direction and a lower end of the wall surface on the cutting direction side. Is provided.
[0032]
The state shown in FIG. 2 is a state in which the cutting depth is set to the maximum. As shown in the figure, the lower end of the protruding portion 3c of the saw cover 3 holds the pin 10 which is an inclined fulcrum member. Abuts on the upper portion (first outer portion) of the first member.
[0033]
When the lower end of the protruding portion 3c is in contact with the upper portion of the holding member 16 as described above, there is a gap between the bolt 8 and the lower end of the elongated hole 9a on the base 4 side as shown in FIG. The design is such that
[0034]
With such a configuration, as shown in FIG. 4, the maximum depth of cut is a dimension k from the bottom surface 4a of the base 4 to the outer shape of the holding portion 16, the lower end of the protruding portion 3c from the center of rotation of the saw blade 2. The processing position of the holding hole 16a of the holding portion 16, the inner diameter of the holding hole 16, the pin 10, the link 9, the bolt 8, and the saw cover 3, the maximum depth of cut can be determined without being affected by the accuracy of the holding hole 3b, etc., and the maximum depth of cut can be set with high accuracy, and workability can be improved. Become like
[0035]
3, the saw cover 3 and the base 4 are relatively rotated about the pin 7 and the pin 10 as a fulcrum from the state shown in FIG. 2, and the angle of the side surface of the saw blade 2 with respect to the bottom surface 4a of the base 4 is changed according to the present embodiment. This shows a state where the electric circular saw is adjusted to 45 degrees which is the maximum inclination angle.
[0036]
As shown in the figure, a gap δ1 is formed between the lower end of the protruding portion 3c and the outer shape of the holding portion 16. By rotating the saw cover 3 toward the base 4 by δ1 from this state, the cutting depth can be increased by δ1 · tan 45 degrees by rotating the saw cover 3 toward the base 4 side, and the cutting depth can be reduced. Can be set to valid.
[0037]
This is a first external part (abutting part in FIG. 2) to which the lower end of the protruding part 3c of the saw cover 3 can abut when the angle of the side surface of the saw blade 2 to the base 4 bottom surface 4a of the holding part 16 is perpendicular. And a second external portion (the cutting depth is increased from the state shown in FIG. 3) to which the lower end of the protruding portion 3c of the saw cover 3 can contact when the angle of the side surface of the saw blade 2 with respect to the bottom surface 4a of the base 4 is inclined to the maximum. (A portion where the lower end of the protruding portion 3c abuts when the saw cover 3 and the base 4 are relatively rotated in the same direction), the distance from the center of the inclined fulcrum portion is different, and the distance of the second outer portion is smaller. It is.
[0038]
If the outer shape of the holding portion 16 is square, the adjustment operation of the inclination angle cannot be performed smoothly. However, in the present embodiment, the first outer shape portion of the holding portion 16 as shown in FIG. And the second outer portion are connected by a gentle curved surface, so that the adjustment operation of the inclination angle can be performed smoothly.
[0039]
Next, another embodiment of the portable electric circular saw of the present invention will be described with reference to FIGS.
[0040]
In the portable electric circular saw according to the present embodiment, the intersection of the base 4 bottom surface 4a and the saw blade 2 is at the same position when the angle of the side surface of the saw blade 2 with respect to the base 4 bottom surface 4a is a right angle and when the angle is 45 degrees. However, when the angle of the side surface of the saw blade 2 with respect to the bottom surface 4a of the base 4 of the holding portion 16 is a right angle, a first outer portion (FIG. 5), and a second outer portion (abutting portion in FIG. 6) to which the lower end of the protruding portion 3c of the saw cover 3 can abut when the angle of the side surface of the saw blade 2 with respect to the base 4 bottom surface 4a is maximized. ) Is formed so that the distance from the center of the inclined fulcrum becomes larger toward the second outer portion.
[0041]
With this configuration, the tilt angle can be adjusted by loosening the bolt 8 and adjusting the depth of cut while allowing the lower end of the protrusion 3c to abut on the outer shape of the holding portion 16. Problems such as the saw cover 3 and other members coming into contact with the base 4 during the angle adjustment can be prevented, and workability can be improved.
[0042]
In the above description, the protruding portion 3c is provided at the lower rear end of the saw cover 3 in the cutting direction. However, even when the protruding portion 3c is not provided, the lower end of the saw cover 3 directly contacts the outer shape of the holding portion 16. good.
[0043]
【The invention's effect】
According to the present invention, when the maximum cut is set, the saw cover and the base come into contact with each other, so that the number of components related to the maximum cut amount can be reduced, and the variation of these components is eliminated, and the variation of the maximum cut amount is suppressed. Electric circular saw can be provided.
[0044]
In addition, the shape of the abutment portion of the base allows the inclination of the saw blade and the distance between the abutment portion and the fulcrum to be changed together with the saw blade. Can be set large.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a portable electric circular saw of the present invention.
FIG. 2 is a left side view showing one embodiment of the portable electric circular saw of the present invention.
FIG. 3 is a left side view showing a state in which the saw cover and the base are relatively rotated from the state shown in FIG. 2 and the side surface of the saw blade is inclined at 45 degrees with respect to the bottom surface of the base;
FIG. 4 is a front vertical sectional view showing one embodiment of the portable electric circle of the present invention.
FIG. 5 is a left side view showing another embodiment of the portable electric circular saw of the present invention.
6 is a left side view showing a state in which the saw cover and the base are relatively rotated from the state shown in FIG. 5 and the side surface of the saw blade is inclined by 45 degrees with respect to the bottom surface of the base;
FIG. 7 is a left side view showing an example of a conventional portable electric circular saw.
FIG. 8 is a front vertical sectional view showing an example of a conventional portable electric circular saw.
FIG. 9 is an enlarged view of a portion E in FIG. 10;
10 is a left side view showing a state in which the saw cover and the base are relatively rotated from the state shown in FIG. 8 and the saw blade side surface is inclined by θ with respect to the base bottom surface.
FIG. 11 is a partial sectional view of FIG. 10;
FIG. 12 is a left side view showing another example of the conventional portable electric circular saw.
FIG. 13 is a relationship diagram showing a state in which the saw cover and the base are rotated about the inclined fulcrum from the state shown in FIG.
14 is a left side view showing a state in which the inclination angle is set to 45 degrees in the portable electric circular saw shown in FIG. 12;
[Explanation of symbols]
1 is a housing, 2 is a saw blade, 3 is a saw cover, 3a is a saw blade storage portion, 3b is a holding hole, 3c is a protruding portion, 4 is a base, 4a is a bottom surface, 4b is an opening, 5 is a rotating shaft member, 6 is a hinge holder, 7 is a pin, 8 is a bolt, 9 is a link, 9a is a long hole, 10 is a pin, 11 is a bevel plate, 11a is a long hole, 12 is a bolt, 13 is a bevel plate, and 13a is a long hole. , 14 are bolts, 15 is a holding portion, 16 is a holding portion, and 16a is a holding hole.

Claims (5)

A housing for accommodating a motor, a saw blade rotatably driven by the motor, and a saw blade housing mounted on the housing and configured to cover substantially the upper half of the outer periphery of the saw blade, and house a portion of the saw blade A saw cover having a portion, a base connected to the saw cover, having a bottom surface slidable on the material to be cut, and a base capable of projecting the saw blade below the bottom surface, in a cutting direction front of the saw cover. The saw cover and the base are relatively rotatable about a rotation shaft member extending substantially parallel to the rotation axis of the saw blade, and the amount of protrusion of the saw blade from the base bottom surface can be adjusted; and The saw cover and the base are rotatable relative to each other with two inclined fulcrum members arranged in front and behind the cutting direction on the base so as to sandwich the saw blade, and the angle of the saw blade side surface with respect to the base bottom surface. A portable electric cutting machine having a configuration in which the lower end of the saw cover in the cutting direction rear side holds the inclined fulcrum member during the rotation with the rotation shaft member as a fulcrum. A portable electric cutting machine characterized in that it can contact above a holding portion provided on an upper surface. 2. The portable cutting machine according to claim 1, wherein a projection is provided at a lower end on a rear side in a cutting direction of the saw cover so as to project toward the base. 3. The portable cutting machine according to claim 1, wherein the base is made of aluminum. A first outer portion to which a lower end of the saw cover in a cutting direction rear side can be contacted when an angle of the saw blade side surface with respect to the base bottom surface is a right angle, and the saw blade side surface with respect to the base bottom surface; A distance from the center of the inclined fulcrum portion is different from a second outer portion to which a lower end portion on the rear side in the cutting direction of the saw cover can contact when the angle of the saw cover is inclined to the maximum. The portable electric cutting machine according to claim 3. 5. The portable electric cutting machine according to claim 4, wherein a distance from the center of the inclined fulcrum portion of the second external portion is smaller than that of the first external portion of the holding portion. 6.

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