JP3691349B2 - Electric circular saw - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric circular saw, and more particularly to a construction technique of an electric circular saw having a guide portion for guiding a cutting operation by a saw blade using a side surface of a workpiece.
[0002]
[Prior art]
In an electric circular saw, when cutting a material to be cut (especially wood) with a saw blade, the guide part arranged in parallel with the saw blade is slid along the side surface of the material to be cut. Techniques for guiding are known. Such a guide portion is generally called a parallel ruler or a lip fence. As a problem with the guide portion that slides along the side surface of the material to be cut in this way, the material to be cut that has been cut by the saw blade tends to escape in a direction perpendicular to the cutting direction of the material to be cut by the saw blade. Therefore, there has been a problem that the cut material to be cut presses the guide portion outward, and smooth sliding of the guide portion is hindered. As a first conventional technique for dealing with this problem, Japanese Patent Laid-Open No. 6-312402 relating to a portable electric circular saw forms a clearance surface on the guide surface of the guide portion on the rear side in the traveling direction of the saw blade. Technology is disclosed. A similar technique is also disclosed in Japanese Utility Model Laid-Open No. 49-126993 concerning a circular saw. However, in these technologies, when the mounting surface of the guide portion with respect to the circular saw is reversed, for example, the guide portion mounted on the right side of the circular saw is changed to the left side, the material to be cut actually escapes. Since the position of the flank and the position of the flank are reversed in the cutting direction, there is a problem that the guide portion cannot be a left / right type. Therefore, as a second prior art, in Japanese Patent Laid-Open No. 8-224701, in a portable electric circular saw, a guide portion is constituted by a guide base and a guide surface constituting member shorter than the guide base, and the guide surface constituting member On the other hand, there is disclosed a technique that makes it possible to change the mounting position on the guide base. Japanese Utility Model Laid-Open No. 4-76405 concerning a circular saw also discloses a technique for attaching a guide surface constituting member shorter than a guide base to the guide base. According to these techniques, since the guide surface constituting member can be positioned only on a part of the guide base, smooth sliding of the guide portion can be ensured even if the material to be cut escapes outward. Since the mounting position of the guide surface constituting member with respect to the guide base can be changed as appropriate, the guide portion can be a left-right type.
[0003]
[Problems to be solved by the invention]
By the way, if the cut material to be cut does not escape due to the material, thickness, etc. of the material to be cut, the guide part will rather slide in contact with the material to be cut and provide a stable guide. It is desirable to do. However, in the second prior art, the guide surface is not formed over the entire guide plate, and the overall contact state cannot be ensured.
[0004]
The subject of the present invention is that both the left and right sides of the saw blade can be used as a single guide part. Of course, the material to be cut escapes to the guide part side during the cutting operation, and the material to be cut to the guide part side. An object of the present invention is to provide an electric circular saw having a rational structure capable of guiding a saw blade smoothly and reliably in any case where it does not escape.
[0005]
[Means for Solving the Problems]
The above-described problems are solved by the invention described in each claim.
As described in claim 1, the electric circular saw according to the present invention includes first and second guide part constituent members, and both guide part constituent members are connected back and forth along the cutting direction of the saw blade. The guide portion arranged in parallel with the saw blade in a state of being in a state of forming a guide surface in which the side surface on the saw blade side of the guide portion contacts and slides on the side surface of the material to be cut, and at least one guide The component members are movable in the direction of approaching and separating from the saw blade. By making the guide surface of one guide part constituent member movable, the guide surface of the guide part is in contact with the side surface of the material to be cut as a whole, and is in an overall contact state and part of the guide surface Only a partial contact state in which only the side surface of the material to be cut is brought into contact with and slidable can be switched, and held in any state by the engagement means. The electric circular saw in the present invention includes both a portable circular saw and a circular saw machine.
[0006]
In order to make a part of the guide surface movable, the guide part is composed of two guide part constituent members, and one of the two guide part constituent members is perpendicular to the cutting direction of the saw blade with respect to the other guide part constituent member. It is preferable to make the structure relatively movable in the direction (corresponding to the invention described in claim 2). As a result, the guide portion can be switched between the entire contact state and the partial contact state .
[0007]
By adopting such a configuration, when cutting the workpiece, if the cut workpiece tries to escape outward from the saw blade side to the guide portion side, The guide surface of the guide member constituting member is shifted in a direction away from the saw blade. Specifically, the guide surface on the front side of cutting by the saw blade contacts and slides on the side surface of the material to be cut, and the guide surface on the rear side of cutting by the saw blade is outward from the side surface of the material to be cut. A shifted state is preferred. As a result, the workpiece to be evacuated outward does not press the guide surface outward on the rear side of the cutting by the saw blade, and a smooth sliding operation of the guide portion is ensured.
[0008]
In addition, when the material to be cut does not escape outward (for example, when cutting a thin plate), it is preferable that the guide surfaces of both guide portion constituting members be flush with each other (equal surface). In other words, it is preferable that the guide surface of the guide portion be in an “overall contact state” in which the guide surface is slid in contact with the side surface of the material to be cut. Thereby, a stable guide at the time of cutting work becomes possible.
[0009]
In the present invention, since at least one guide surface of both guide member constituting members is movable in a direction approaching or separating from the saw blade, which portion of the guide surface is brought close to or separated from the saw blade side. By selecting as appropriate, both the guide portion mounted on the right side of the saw blade and the guide portion mounted on the left side can be used together.
[0010]
Further, according to a third aspect of the present invention, the guide part of the portable electric circular saw is formed into a long shape having the traveling direction of the saw blade as a major axis by two guide part constituting members, and is parallel to the saw blade. The guide bar is preferably attached to a guide bar protruding from the base so that the side surface on the base side of the guide portion contacts and slides on the side surface of the workpiece. Further, the constituent members of the guide portion are configured to be releasably engaged with each other by the engaging means, and when the engaging means is released, one of the constituent members is in the traveling direction of the saw blade with respect to the other constituent members. It is preferable to adopt a configuration that moves relatively in the orthogonal direction. With such a configuration, the guide surfaces of the guide member constituting members are entirely slid in contact with the side surface of the material to be cut, and part of the saw blade in the traveling direction side. The guide surface can be switched between a partial contact state in which the guide surface contacts and slides on the side surface of the workpiece, and is held in any state by the engagement means.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an electric circular saw according to an embodiment of the present invention will be described in detail with reference to the drawings. In this embodiment, a portable electric circular saw is described as an example. As shown in FIGS. 1 and 2, the circular saw 101 according to the present embodiment generally includes a base 110 placed on a material to be cut, and a circular saw main body 120 provided on the base 110. The guide part 130 is slid along the side surface of the material to be cut. In FIG. 2, the relationship between the workpiece W and the guide portion 130 indicated by a two-dot chain line is shown. The circular saw body 120 includes a saw blade 121, a blade cover 122 that covers the saw blade 121, a motor housing 123 that houses a motor for rotationally driving the saw blade 121, and the circular saw 101 is advanced to perform cutting work. And a handle 125 for performing the above.
[0012]
The guide part 130 is attached to the base 110 via a pair of guide bars 133 and 133. Each guide bar 133 is inserted into a fitting hole 113 formed on the base 110 so as to be perpendicular to the traveling direction X of the circular saw 101 (that is, the traveling direction of the saw blade 121), and the presser screw 111 is inserted. Thus, the base 110 is releasably fixed. A guide portion 130 is attached to one end side (right end side in FIG. 2) of the guide bar 133 via an attachment screw 135.
[0013]
The guide portion 130 is arranged in parallel with the traveling direction X of the circular saw 101 (the traveling direction of the saw blade 121), and is formed longer than the base 110 with respect to the traveling direction X of the circular saw 101. The first guide part constituting member 131 and the second guide part constituting member 132 are engaged with each other. Of the first and second guide part constituting members 131 and 132, the side surface on the base 110 side (the side surface on the left side of the guide part 130 in FIG. 2) of the workpiece W is cut when the workpiece W is cut. Guide surfaces 131a and 132a for sliding along the side surface (the right side surface of the workpiece W in FIG. 2) to guide the cutting operation are formed. The gap D between the base 110 and the guide portion 130 can be increased or decreased as appropriate by adjusting the fixing position of the guide bar by the holding screw 111 of the guide bar. Barrier portions 151 and 152 are attached to the first and second guide portion constituting members 131 and 132 via attachment screws 153. The significance of the barrier portion will be described later.
[0014]
The first and second guide part constituting members 131 and 132 are relatively disengaged in the direction orthogonal to the traveling direction X of the circular saw 101 (left and right in FIG. 2) by releasing the engagement in the engagement means 137. It is supposed to be movable. Since the guide member constituting members 131 and 132 are fixed to the guide bar 133 by the mounting screws 135, when the guide member constituting members 131 and 132 are moved relatively, the engaging means 137 is disengaged, The guide bar 133 is released from being fixed by the guide bar presser screw 111, and the guide bar 133 is appropriately moved in the left-right direction in FIG. In FIG. 2, the guide surface 132 a of the second guide member 132 is shifted in a direction away from the base 110 with respect to the guide surface 131 a of the first guide member 131. That is, with respect to the guide portion 130, the guide surface 131 a on the front side in the traveling direction X of the circular saw 101 is in sliding contact with the (right) side surface of the workpiece W, whereas the guide surface 132 a on the rear side in the traveling direction X is The gap C is shifted away from 110, and a gap C is formed between the workpiece W and the workpiece.
[0015]
Detailed structures of the first guide part constituting member 131 and the second guide part constituting member 132 constituting the guide part 130 are shown in FIGS. 3 (A) to 3 (C). 3A shows a state in which the second guide member constituting member 132 is relatively shifted in the right direction in the drawing with respect to the first guide member constituting member 131. In FIG. The guide member constituting member 131 and the second guide member constituting member 132 are placed at the same position, and the guide surface 131a and the guide surface 132a are in a flush state. 3A and 3B, the traveling direction of the circular saw is indicated by a symbol X. FIG. 3C shows a state in which the guide portion 130 is viewed from the side, and the engaging convex portion 141 is fitted into the engaging concave portion 142 so that the first guide portion constituting member 131 and the second guide portion constitution A state in which the member 132 is connected is shown. A large number of cavities H are formed in the first guide part constituting member 131 and the second guide part constituting member in order to reduce weight and secure rigidity.
[0016]
Details of the engaging means 137 for releasably engaging the first and second guide member members 131 and 132 in the guide part 130 are shown in FIGS. 4 (A), 4 (B) and 5 (A), (B). It is. As shown in FIG. 4A, the engaging means 137 has an engaging knob 138 and an engaging claw 139. The engagement knob 138 is biased toward the engagement claw 139 (left direction in the figure) by the spring 138b, whereby the claws 138a and 139a are engaged with each other so that the first and second guide member constituting members 131 and 132 are mutually engaged. Is engaged.
[0017]
When disengaging the first and second guide part constituting members 131 and 132, the engagement knob 138 is moved away from the engagement claw part 139 while being directed toward the biasing force of the spring 138 b (the engagement knob 138. (Indicated by a right-pointing arrow in the figure) is moved with a finger to release the engagement with the claws 138a and 139a. At the same time, one guide member constituting member is shifted relative to the other guide member member. In the present embodiment, a state in which the second guide member constituting member 132 is shifted with respect to the first guide member constituting member 131 is shown in FIG. In FIG. 4B, after the second guide member 132 is shifted, the engagement knob 138 is moved again toward the engagement claw 139 by the urging force of the spring 138b, and the claws 138a and 139a are engaged with each other. It is shown.
[0018]
5A and 5B show the detailed longitudinal sectional structure of the first and second guide part constituting members 131 and 132 in the guide part 130. FIG. The engagement knob 138 is attached to the tip of the second guide member constituting member 132 via a retaining member 138c and a screw 138d, and the engaging claw portion 139 is attached to the first guide member constituting member 131 via a screw 139b. Mounted on the tip. 5A shows a state where the engagement knob 138 and the engagement claw 139 are engaged by the biasing force of the spring 138b, and FIG. 5B shows that the engagement knob 138 is engaged with the engagement claw 139. A state in which the engagement is released by moving in a direction away from the center (right direction in the figure) is shown.
[0019]
6A and 6B show the bottom structure of the guide portion 130, and FIG. 6C shows the structure of the guide surfaces 131a and 132a in the guide portion 130. As shown in FIGS. 6A and 6B, the first and second guide portion constituting members 131 and 132 are prevented from coming off while being relatively movable via a retaining screw 143 and a slide groove 145. ing.
[0020]
Now, when performing the cutting operation of the material to be cut using the circular saw 101, it is necessary to cope with the sliding obstruction of the guide portion that occurs when the cut material to be cut escapes outward. In this case, the circular saw 101 configured as described above can be dealt with by relatively shifting the first and second guide portion constituting members 131 and 132 in a direction perpendicular to the saw blade. That is, as shown in FIG. 2, the second guide member constituting member 132 is shifted outward from the first guide member constituting member 131 in a direction orthogonal to the circular saw 101 (direction orthogonal to the saw blade). Accordingly, when the circular saw 101 is advanced in the traveling direction X and the cutting operation is performed, the cut material to be cut escapes outward (in the direction from the base 110 to the guide portion 130) on the rear side in the traveling direction X. Even so, since the gap C is formed between the second guide part constituting member 132 constituting the rear guide surface of the guide part 130 and the material to be cut W, the object to be cut is about to escape outward. The guide surface 132a is not strongly pressed by the material. Therefore, smooth sliding of the guide part 130 can be ensured even when the material to be cut is about to escape outward during the cutting operation.
[0021]
If the material to be cut does not escape outward during the cutting operation, the guide portion 130 is in the state shown in FIG. 3B, that is, the first and second guide surfaces 131a and 132a are flush with each other. . As a result, the guide surfaces 131a and 132a that are flush with each other are integrally slidably in contact with the side surface of the material to be cut, and a stable cutting operation guide is possible.
[0022]
In addition, at the time of a cutting operation, the mounting surface of the guide part with respect to a base may be switched right and left depending on the cutting position of the material to be cut. For example, as shown in FIG. 2, the guide portion 130 mounted on the right side of the base 110 is mounted on the left side of the base 110 as shown in FIG. Is the case. Switching of the mounting surface is performed by switching the insertion direction of the guide bar 133 with respect to the fitting portion 113 while releasing the pressing of the holding screw 111. In this case, the front-rear relationship between the first guide part constituting member 131 and the second guide part constituting member 132 is switched with respect to the traveling direction X of the circular saw 101. Accordingly, in the state shown in FIG. 7, the first guide member constituting member 131 located on the rear side in the traveling direction X is shifted in a direction away from the base 110 (leftward in FIG. 7), thereby sliding the guide member 130. Movement inhibition measures will be planned. As described above, in the circular saw 101 according to the present embodiment, even when the guide part 130 is mounted on either the left or right surface of the base 110, it is possible to effectively prevent the sliding of the guide part 130. It is reasonable that the guide portion 130 can be configured. In the present embodiment, the guide portion 130 is attached to the base 110 via the guide bar 133. However, the guide portion 130 may be attached to the circular saw body 120.
[0023]
Next, the details of the barrier portions 151 and 152 shown in FIG. 2 will be described. The barrier portions 151 and 152 in FIG. 2 are attached so as to be in contact with the guide surfaces 131a and 132a on the upper surfaces of the first and second guide member constituting members 131 and 132 via attachment screws 153. FIG. 8 and FIG. 9 show the relationship between the barrier portions 151 and 152, the guide member members 131 and 132, and the guide bar 133. FIG. 8 shows a configuration in which the gap S formed between the guide member 131, 132 and the guide bar 133 is closed by the barriers 151, 152. On the other hand, FIG. 9 shows a configuration in which the gap S is not closed. Each state in FIGS. 8 and 9 can be selected as appropriate by loosening the tightening of the barrier portions 151 and 152 by the mounting screw 153 and changing the arrangement position of the barrier portions 151 and 152. A structure for loosening the tightening of the mounting screw 153 is shown in FIG.
[0024]
Since the relationship between the barrier portions 151 and 152 and the gap S can be switched, the following usage modes are possible. First, when the cutting width in the cutting operation is narrow, that is, the distance from the saw blade 121 to the side surface (guide surface) of the material to be cut is short, and the guide portion 130 approaches the base 110 and interferes with it. When the cutting operation is performed, the barrier portions 151 and 152 are retracted so that the upper end edge of the guide portion 130 can enter the lower side of the base 110, and the state shown in FIG. On the other hand, when trying to cut a thin plate, for example, the cut thin plate may warp upward due to vibration or the like and enter the gap S between the guide bar 133 and the guide portion 130. When the material to be cut is a thin plate, the effective area of the guide surface that is in sliding contact with the side surface of the thin plate is reduced, so that the edge of the thin plate may enter the gap S due to vibration during operation. In either case, the thin plate may be caught in the gap S and hinder the cutting operation. Therefore, in order to prevent the thin plate edge from entering the gap S, the barrier portions 151 and 152 are configured to block the gap S (configuration shown in FIG. 8). FIG. 3A corresponds to FIG. 8, and the second guide member constituting member 132 is shifted outward with respect to the first guide member constituting member 131, and the barrier portions 151 and 152 are guided by the guide surfaces 131 a and 132 a. The state arranged on the side is shown. 3B, the second guide member constituting member 132 is disposed at the same position as the first guide member constituting member 131, and the barrier portions 151, 152 are guided to the guide surface via the mounting screw 153 and the groove 153a. A state of being retracted to the opposite side to 131a and 132a is shown.
[0025]
(Other changes)
In the above-described embodiment, the guide portion is divided into two constituent members, each of the constituent members is formed with a guide surface, and each constituent member can be relatively shifted. In this regard, the guide portion itself is formed integrally, and the guide surface is composed of two surface members (first and second guide portion constituent members), and each surface member is relative to the direction orthogonal to the saw blade. A configuration that is movable is possible. As a result, when the material to be cut is about to escape outward, the surface member located on the rear side in the traveling direction of the saw blade is shifted to the outside, and the material to be cut is about to escape outward. If not, the respective surface members can be placed in equal positions (on the same plane) and slidably brought into contact with the side surface of the material to be cut to provide stable guidance.
[0026]
Furthermore, in the present embodiment, a portable electric circular saw has been described as an example, but the present invention can also be configured as a circular saw. 11 and 12 show the configuration of a circular saw 201 as a modified example. The circular saw 201 is rotated by being connected to the base 210 provided on the base 211, the motor unit 223 disposed in the base 211, and the motor unit 223, and cutting the material to be cut. And a guide portion 230 fixed to the base 210 via a mounting portion 233. As shown in FIG. 11, the material to be cut W made of wood is fed upward in the figure while being guided while the side surface is in sliding contact with the guide portion 230. The advancing direction of the workpiece W is indicated by Y in the figure. In the case of the portable circular saw described above, the saw blade advances to the workpiece to be fixed and the cutting operation is performed, whereas in the case of a circular saw, the fixed saw blade is used. On the other hand, the material to be cut advances and the cutting work is performed. In any case, the phenomenon that the cut material to be cut away escapes to the guide portion is generated on the rear side of the cutting work portion by the saw blade. The guide part 230 includes a first guide part constituent member 231 and a second guide part constituent member 232. The material to be cut W shown in FIG. 11 is cut by the saw blade 221 while being sent upward (Y direction) in the drawing. Therefore, it is necessary to cope with a case where the material to be cut W1 on the upper portion of the material to be cut W, that is, the cutting rear side, escapes to the guide portion 230 side. In other words, it is necessary to cope with the case where the cut material W1 is about to escape outward in the direction perpendicular to the direction Y, that is, from the saw blade 221 to the guide portion 230 on the rear side of the cut. For this reason, as shown in FIG. 11, the second guide member constituting member 232 is shifted outward (leftward in the figure) relative to the first guide member constituting member 231. Thereby, it is avoided that the workpiece W1 trying to escape outwardly strongly presses the guide portion 230, and a smooth sliding operation between the guide portion 230 and the workpiece W is ensured. Become. In addition, about the structure for engaging the 1st guide part structural member 231 and the 2nd guide part structural member 232, since it is equivalent to the structure in the above-mentioned portable circular saw, detailed description is abbreviate | omitted for convenience. .
[0027]
In the circular saw 201, the case where the sliding surface between the workpiece W and the guide portion 230 is changed from the left side to the right side is indicated by a two-dot chain line in FIG. In this modification, the attachment of the guide portion 230 to the base 210 by the attachment portion 233 is released, and the guide portion 230 is shifted in the right direction in the drawing in parallel. And it fixes to the position shown with a dashed-two dotted line through the attaching part 233. FIG. In this case, since the configuration surfaces of the guide surfaces 231a and 232a in the first and second guide unit constituent members 231 and 232 are reversed left and right, the second guide unit configuration member is in relation to the first guide unit configuration member 231. 232 is shifted to the right in the figure. This ensures smooth sliding when the cut material W2 is about to escape outward (rightward in the figure) while being guided through the right side surface of the material W. It will be.
[0028]
In addition, although not included in the invention described in the claims, the same applies to a configuration in which one of the two constituent members constituting the guide portion can be rotated outward with respect to the other constituent members. The effect of this can be obtained . In this case, when the material to be cut is about to escape outward, this is dealt with by rotating the constituent member located behind the direction of travel of the saw blade outward to let the material to be cut escape. Further, one of the two constituent members constituting the guide portion is configured to be rotatable around the major axis of the other constituent member, and the guide surface before and after the rotation in the direction orthogonal to the saw blade. It is also possible to configure so that the positions of are different.
[0029]
【The invention's effect】
According to the present invention, both the left and right sides of the saw blade can be used as a single guide part. Of course, the material to be cut escapes to the guide part side during the cutting operation, and the material to be cut moves to the guide part side. It was decided to provide an electric circular saw with a rational structure that can guide the saw blade smoothly and reliably in any case where it does not escape.
[Brief description of the drawings]
FIG. 1 is a front view showing an overall structure of a circular saw according to an embodiment.
FIG. 2 is a plan view showing the entire structure of a circular saw according to the present embodiment.
FIG. 3 is a diagram showing a structure of a guide portion.
FIG. 4 is a view showing a structure of an engaging means in a guide portion.
FIG. 5 is a cross-sectional view showing the structure of the engaging means in the guide portion.
FIG. 6 is a diagram showing a structure of a guide part.
FIG. 7 is a plan view showing a state in which the guide portion is mounted on the left side of the circular saw.
FIG. 8 is a diagram illustrating a relationship among a guide portion, a guide bar, and a barrier portion.
FIG. 9 is a view similarly showing a relationship among a guide portion, a guide bar, and a barrier portion.
FIG. 10 is a diagram showing in detail the structure of the barrier portion.
FIG. 11 is a plan view showing a structure of a circular saw machine according to a modified example.
FIG. 12 is a front view showing a structure of a circular saw machine according to a modified example.
[Explanation of symbols]
101 circular saw 110 base 120 circular saw body 121 saw blade 123 motor housing 125 handle 130 guide part 131 first guide part constituting member 131a first guide surface 132 second guide part constituting member 132a second guide surface 133 Guide bar 137 engaging means 151 barrier section

Claims (3)

A base abutting on the material to be cut; a saw blade rotatably provided on the base; and the material to be cut when cutting the material by moving the saw blade relative to the material to be cut An electric circular saw having a guide portion for guiding the cutting operation of the saw blade by being slid along the side surface of the saw blade,
The guide part includes first and second guide part constituent members, and both guide part constituent members are connected to the saw blade in a state where they are connected back and forth along the advancing direction of the saw blade via engagement means. Are arranged in parallel with each other, and the side surfaces on the saw blade side of the both guide portion constituting members constitute a guide surface that slides in contact with the side surface of the material to be cut. The engaging means is releasably engaged, and at least one guide member is movable in a direction approaching or separating from the saw blade, whereby the guide surfaces of the two guide members are mutually connected. The entire contact state that is flush with the side surface of the material to be cut as a whole and is partially slid while only one guide surface is in contact with the side surface of the material to be cut. Switchable between contact states and by the engaging means Electric circular saw, characterized in that also the possible retaining structure on the state of the deviation.   2. The electric circular saw according to claim 1, wherein one of the guide member constituting members is movable relative to the other in a direction perpendicular to the cutting direction of the saw blade, whereby the guide member is An electric circular saw characterized in that it can be switched between the overall contact state and the partial contact state and can be held in either state. A base placed on the workpiece, a circular saw body provided on the base and rotatably supporting the saw blade, and the saw blade being advanced to cut the workpiece A portable electric circular saw having a guide portion that guides the progress of the saw blade by being slid along the side surface of the workpiece;
The guide part includes first and second guide part constituent members, and both guide part constituent members are connected to the saw blade in a state where they are connected back and forth along the advancing direction of the saw blade via engagement means. It is attached to a guide bar that protrudes from the base so as to be arranged in parallel with the base, and constitutes a guide surface in which the side surfaces on the base side of the guide member constituting members are slid in contact with the side surface of the material to be cut. The guide member constituting members are releasably engaged with each other by the engaging means, and when the engaging means is released, one guide member constituting member is in contact with the other guide member constituting member. Relative movement in a direction perpendicular to the traveling direction of the saw blade, the guide surfaces of the guide member constituting members are thereby flush with each other and are in contact with the side surfaces of the material to be cut as a whole. The overall contact state that is It is possible to switch between a partial contact state in which only the inner surface contacts and slides on the side surface of the material to be cut, and can be held in any state by the engagement means. Electric circular saw.

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