JP2012116161A - Portable cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable cutter which sufficiently secures the strength of a supporter 14 without increasing the total length of a surface plate 2, and also sufficiently secures an installing space of a ruler 20.SOLUTION: The portable cutter includes a supporter 14 rotatably supporting a cutter body 1 with a saw blade 3 for cutting, a rotate drive mechanism for rotating the saw blade 3, and a grip 9 at the front of the surface plate 2 in which an opening part 4 allowing the penetration of the saw blade 3 is formed, and a ruler 20 which is arranged to be freely laterally put in and taken out, wherein a guide groove 18 for passing the ruler 20 is formed in a lower part of the front part of the supporter 14.

Description

  The present invention relates to a portable cutting machine improved with respect to a ruler mounting structure.

  Generally, a portable cutting machine that cuts a member with a rotating tip saw can cut a metal member such as iron or aluminum in addition to a wooden board. When cutting these members to be cut, they are often cut in parallel with the edges of the members to be cut. Therefore, a ruler is provided in the portable cutting machine (see Patent Document 1).

  The ruler is a long and thin plate, and is formed with an abutting portion to be applied to the edge of the member to be cut at one end. The ruler is disposed at a front position of the surface plate and can be inserted and removed from the side.

  By the way, a supporter is fixed to the surface plate of the portable cutting machine, and a cutting machine body provided with a circular saw blade is rotatably provided on the supporter. Thereby, it is comprised so that the protrusion amount of the saw blade from the bottom face of a surface plate can be adjusted by rotating a cutting machine main body.

  Normally, a ruler is placed in front of the supporter so that the surface plate does not become too large.

  By the way, it is preferable that the grip of the cutting machine is tilted backward with respect to the horizontal surface plate and not tilted forward, regardless of whether the protruding amount of the saw blade is large or small. When the grip is tilted forward, it is difficult to apply force when cutting while pushing the cutting machine forward, and the operability is not good. Therefore, since the rotation angle of the grip becomes close to the maximum when the protruding amount of the saw blade with respect to the surface plate is small, at this time, the grip should be at least horizontally or tilted backward with respect to the surface plate. . For this purpose, the rotation shaft provided on the supporter, which is the center of rotation of the grip, is separated from the surface plate, that is, the height of the supporter is sufficiently high, and the rotation shaft is provided at the upper end. It is preferable to do this. This is because the maximum rotation angle of the grip when the amount of protrusion of the saw blade is small is smaller when the rotation axis is set higher in advance.

JP 2000-135623 A

  However, if the supporter is raised, its strength becomes weaker, so it is necessary to enlarge the supporter. When the supporter is increased in size, the front end of the supporter protrudes forward from the previous one. When the front end of the supporter protrudes forward, the position of the ruler arranged at the front part of the supporter must be positioned further forward. Along with this, there arises a problem that the overall length of the surface plate is increased, and the entire weight is inevitably increased.

  The present invention solves the above-described problems, and in particular, can secure a sufficient supporter strength without increasing the overall length of the surface plate, and at the same time, can obtain a sufficient space for attaching a ruler. The issue is to provide

  In order to solve the above-mentioned problem, the invention according to claim 1 is directed to a rotary drive mechanism and an operation for rotating the saw blade and the saw blade at a front portion of a surface plate formed with an opening through which the saw blade for cutting passes. In a portable cutting machine comprising a supporter that rotatably supports a cutting machine body provided with a handle, and a ruler that is detachably provided on the side, the ruler is placed under the front part of the supporter. A guide groove to be passed is formed.

  According to a second aspect of the present invention, in the first aspect, the supporter includes a supporter main body and a reinforcing portion formed at a front portion thereof, and a guide groove that allows the ruler to pass therethrough is formed at a lower portion of the reinforcing portion. It is characterized by that.

  The invention according to claim 3 is characterized in that, in claim 2, the reinforcing portion is formed of a plurality of ribs protruding from the front portion of the supporter main body and a connecting piece connecting the lower ends of the ribs.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the cutting machine body is rotated with respect to the surface plate so that the saw blade slightly protrudes below the surface plate. The grip of the operation handle is formed so as to tilt backward.

According to the first aspect of the present invention, the guide groove that allows the ruler to pass is formed in the lower part of the front part of the supporter that rotatably supports the cutting machine body, so that a space for inserting and removing the ruler at the front position of the supporter is provided. There is no need to form, and therefore there is no need to increase the overall length of the surface plate. Further, the height of the supporter can be increased to increase its strength, and at the same time, a sufficient space for attaching a ruler can be obtained.
According to the second aspect of the present invention, the supporter is composed of the supporter body and the reinforcing part formed in the front part thereof, and the guide groove that allows the ruler to pass is formed in the lower part of the reinforcing part. The reinforcing portion to be reinforced moves the ruler mounting position forward from the conventional position, so that it is not necessary to increase the overall length of the surface plate.

  According to the invention of claim 3, since the reinforcing portion is formed from the plurality of ribs protruding from the front portion of the supporter main body and the connecting piece connecting the lower ends of these ribs, the lower portion of the rib portion is cut in a bridge shape. The guide groove can be formed and the reinforcing portion can be easily fixed by notching the guide groove and fixing the connecting piece to the surface plate by welding or the like.

  According to the invention of claim 4, the cutting machine body is rotated with respect to the surface plate so that the saw blade slightly protrudes below the surface plate, as in the case of cutting a thin member to be cut. Even in this case, since the grip of the operation handle is tilted backward, it can be cut by pushing the grip later, and the pressing force can be used efficiently, so it is hard to get tired and the work efficiency is also good .

  In addition, since the height of the supporter can be increased while ensuring the strength of the supporter, the rotation angle of the operation handle is relatively small even if the cutting machine body is rotated so that it is tilted to the maximum with respect to the surface plate. I'll do it. For this reason, it is possible to easily create a state in which the grip of the operation handle is inclined backward.

The perspective view of the portable cutting machine which concerns on this invention Perspective view of the portable cutting machine with a ruler attached Side view of the above portable cutting machine Sectional drawing on the XX line of FIG. Side view showing the rotation state of the cutting machine body when cutting a thin member Bottom view of portable cutting machine

  1-4, the code | symbol A shows a portable cutting machine. In this cutting machine A, a cutting machine main body 1 is rotatably provided on a surface plate 2, and a saw blade (round saw) 3 provided on the cutting machine main body 1 is provided on one side of the surface plate 2. An opening 8 is formed so as to pass therethrough, and a part of the saw blade 3 is configured to protrude downward from the surface plate 2.

  The cutting machine main body 1 is provided with a cutting blade 3 for cutting, a rotation drive mechanism for rotating the saw blade 3 and an operation handle 5. The rotational drive mechanism includes an electric motor 6 that is operatively connected to the saw blade 3 via a reduction gear, and a battery pack 7 that supplies electric power to the electric motor 6. The electric motor 6 is disposed inside the motor housing. The operation handle 5 is provided between the saw blade 3 and the electric motor 6. The handle 5 is formed in a triangular shape, a grip 9 is formed at the rear, and a trigger 10 for controlling the operation of the electric motor 6 is attached to the lower part of the front end of the grip 9.

  An upper guard (also used as a dust collection box) 11 that protects the upper part of the saw blade 3 is attached to the saw blade 3 side of the cutting machine body 1, and a lower guard 11 a that protects the lower part of the saw blade 3 is a saw blade. 3 is mounted so as to be pivotable from the rear to the top around the rotation axis 3.

  The surface plate 2 is made of metal and is formed by raising an edge 13 around a rectangular plate-like portion 12, and an opening 8 is formed through one side of the plate-like portion 12 (also in FIG. 6). reference). A metal supporter 14 that rotatably supports the cutting machine body 1 is integrally fixed to the front portion of the surface plate 2. The supporter 14 is composed of a supporter body 15 and a reinforcing part at the front part thereof. The supporter main body 15 is composed of a bottom piece 15a and upright pieces 15b on both sides thereof. A bearing hole 19 is formed in the upper portion of the upright piece 15b, and a rotary shaft provided at the front portion of the cutting machine main body 1 in the bearing hole 19. 17 is rotatably supported. Thereby, the cutting machine main body 1 becomes rotatable with respect to the surface plate 2, and can adjust the amount of protrusion of the saw blade 3 from the surface plate 2 according to the rotation angle. And when cutting a thin member to be cut such as a metal plate, the protruding amount of the saw blade 3 may be small, so that it is rotated largely with respect to the cutting machine body 1. At this time, although the operation handle 5 is also largely rotated around the rotation axis with respect to the surface plate 2, the grip 9 is configured to be inclined substantially horizontally or rearward even in that case.

  Next, since the height H to the rotation axis of the bearing hole 19 provided in the supporter body 15 is sufficiently high, it is necessary to ensure sufficient strength of the supporter body 15 when the cutting machine body 1 is rotated. There is. For this reason, the reinforcement part 16 is formed in the front part of the supporter main body 15. FIG. The reinforcement part 16 is comprised by the rib-shaped reinforcement piece 16a extended ahead from each standing piece 15b of the supporter main body 15, and the bottom piece 16b which connects the lower end of these reinforcement pieces 16a.

  By the way, the reinforcing portion 16 is formed in a bridge shape with respect to the surface plate 2. That is, a guide groove 18 is formed in the lower portion of the reinforcing portion 16 by a notch. In the lower part of the reinforcing portion 16, the front and rear bottom pieces 15a and 16b are not continuous, but a guide groove 18 is formed between the front and rear bottom pieces 15a and 16b. The supporter 14 is integrally fixed by spot welding the front and rear bottom pieces 15 a and 16 b to the surface plate 2.

  Next, a ruler mounting portion is formed on the surface plate 2. That is, as shown in FIG. 2, the ruler 20 is formed by forming an abutting portion 21 for abutting against the edge of the member B to be cut at one end of an elongated plate-like body 20 a. An insertion port 22 for the ruler 20 is formed in the front part of the side edges 13 of the surface plate 2. When the ruler 20 is inserted from one insertion port 22 into the other insertion port 22, the reinforcement part 16 of the supporter 14 becomes an obstacle, but the reinforcement part 16 is formed in a bridge shape, and a space is provided below the reinforcement part 16. A guide groove 18 is formed. The ruler 20 may pass through the guide groove 18. A guide piece 23 for allowing the ruler 20 to pass therethrough is also formed in the vicinity of the one insertion port 22, and a fixing screw 24 for pressing and fixing the ruler 20 inserted therein is provided on the guide piece 23. As a result, the ruler 20 can be freely inserted into and removed from the insertion port 22, the guide groove 18, and the guide piece 23. When removing the ruler 20, the fixing screw 24 may be loosened.

  Two peep holes 25 and 26 (see also FIG. 6) are formed in front of the surface plate 2 so that the cutting direction of the saw blade 3 can be confirmed from above.

  When cutting the member to be cut by the cutting machine, first, the ruler 20 is inserted into the other insertion port 22 through the guide groove 18 and the guide piece 23 from one insertion port 22, and the fixing screw 24 is inserted at a predetermined position. Tighten and fix. Next, the lower surface of the surface plate 2 is applied to the surface of the member to be cut while the abutting portion 21 of the ruler 20 is in contact with the side surface of the member to be cut, the switch is turned on by the trigger 10 and the electric motor 6 is operated. What is necessary is just to move the surface plate 2 along the surface of a member to be cut, pushing 5. The ruler 20 can accurately cut a portion that is separated from the side surface of the member to be cut by a certain distance.

  And when cutting a thin member to be cut, as shown in FIG. 5, the above-mentioned saw blade 3 slightly protrudes below the surface plate 2 (for example, 0.1 mm or more when cutting a thin steel plate). ), The cutting machine body 1 is largely rotated and tilted with respect to the surface plate 2. Even at this time, the grip 9 is configured to be inclined substantially horizontally or rearward. Press to cut.

  Even when the cutting machine main body 1 is rotated greatly, the height H to the rotation axis of the bearing hole 19 provided in the supporter main body 15 is sufficiently high. Therefore, the rotation angle when the cutting machine main body 1 and the handle 5 are rotated. Is small.

  Further, the strength of the supporter body 15 is reduced by increasing the height H to the rotation axis of the bearing hole 19 provided in the supporter body 15, but the strength of the entire supporter 14 is sufficient by providing the reinforcing portion 16. Secured.

  The guide groove 18 of the ruler 20 is not limited to that formed in the reinforcing portion 16 formed in a rib shape. For example, it is good also as a structure which forms a support groove | channel in the lower part of the front part of a supporter, forming a supporter large so that the supporter main body 15 and the reinforcement part 16 may be included.

  According to the portable cutting machine having the above configuration, the guide groove 18 that allows the ruler 20 to pass is formed in the lower part of the front part of the supporter 14 that rotatably supports the cutting machine body 1. It is not necessary to form a space for inserting and removing the ruler 20, and therefore, it is not necessary to increase the overall length of the surface plate 2. Moreover, the supporter 14 can be enlarged to improve its strength, and at the same time, a sufficient space for attaching the ruler 20 can be obtained.

  Further, the supporter 14 is composed of the supporter main body 15 and the reinforcing part 16 formed at the front part thereof, and the guide groove 18 through which the ruler 20 is passed is formed in the lower part of the reinforcing part 16, so that the supporter main body 15 is reinforced. Due to the reinforcing portion 16, the attachment position of the ruler 20 is moved forward from the conventional position, so that it is not necessary to increase the overall length of the surface plate 2.

  Further, since the reinforcing portion 16 is formed by a plurality of ribs protruding from the front portion of the supporter main body 15 and a connecting piece connecting the lower ends of these ribs, the lower portion of the rib portion is cut out in a bridge shape to guide the guide groove 18. Then, by fixing the connecting piece to the surface plate 2 by welding or the like, it is possible to easily form the guide groove 18 and fix the reinforcing portion 16.

  Furthermore, even when the cutting machine body 1 is rotated with respect to the surface plate 2 so that the saw blade 3 slightly protrudes below the surface plate 2, as in the case of cutting a thin member to be cut, Since the grip 9 of the operation handle 5 is formed so as to incline backward, the grip 9 can be cut by pushing it later, and the pushing force can be used efficiently, so that it is less fatigued and the work efficiency is good. .

  In addition, since the height of the supporter 14 can be increased while ensuring the strength of the supporter 14, the rotation angle of the operation handle 5 can be increased even if the cutting machine body 1 is rotated so as to be inclined to the maximum with respect to the surface plate 2. Is relatively small. For this reason, it is possible to easily create a state in which the grip 9 of the operation handle 5 is inclined backward.

DESCRIPTION OF SYMBOLS 1 Cutting machine main body 2 Surface plate 3 Saw blade 9 Grip 14 Supporter 15 Supporter main body 16 Reinforcement part 16a Reinforcement piece 16b Bottom piece 18 Guide groove 20 Ruler

Claims (4)

A cutting machine body having a rotation drive mechanism for rotating the saw blade and the saw blade and an operation handle is rotatably supported on the front portion of the surface plate formed with an opening through which the saw blade is passed. In a portable cutting machine equipped with a supporter and a ruler that is detachable on the side,
A portable cutting machine, wherein a guide groove for allowing the ruler to pass therethrough is formed in a lower portion of the front portion of the supporter.   The said supporter is comprised from the supporter main body and the reinforcement part formed in the front part, The guide groove which allows the said ruler to pass through was formed in the lower part of the said reinforcement part, The Claim 1 characterized by the above-mentioned. Portable cutting machine.   The portable cutting machine according to claim 2, wherein the reinforcing portion is formed of a plurality of rib-like reinforcing pieces projecting from the front portion of the supporter body and a bottom piece connecting the lower ends of the ribs.   With the cutting machine body rotated with respect to the surface plate so that the saw blade slightly protrudes below the surface plate, the grip of the operation handle is formed to tilt substantially horizontally or backward. The portable cutting machine according to any one of claims 1 to 3, wherein the portable cutting machine is characterized.

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