JP5352898B2 - Portable cutting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably mount a sub-base 12 to a main base 6a, to always cut a material to be cut in the stable state, and to eliminate impairing of durability of a saw blade 1. <P>SOLUTION: In the portable cutting machine, a cutting plate 6 is arranged on a lower part of a cutting machine body 3 having the cutting saw blade 1, and the cutting plate 6 is constituted of: the main base 6a for supporting the cutting machine body 3; and the sub-base 12 provided detachably by sliding on the saw blade 1 side of a main base 6a. The saw sliding arms 20, 21 are projectedly formed from a side part of the sub-base 12 to the main base 6a side, and restriction parts 22, 13 of the sub-base 12 are provided on an upper surface and a lower surface of the main base 6a. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a portable cutting machine.

  In general, this type of portable cutting machine is provided with a surface plate (base) for cutting a material to be cut such as a wooden board at a right angle to the surface thereof. An elongated opening is formed in the surface plate, and a saw blade is provided so as to protrude downward from the opening. Since the saw blade is provided so as to form a right angle with the surface plate, it can be cut so that the cut surface of the material to be cut is perpendicular to the surface of the material to be cut.

  As described above, the portable cutting machine is usually used for cutting so that the cut surface of the material to be cut is perpendicular to the surface. However, for example, when cutting the floor material near the wall, that is, so-called cutting, it may be necessary to move the saw blade along the wall. When the saw blade is arranged so that the opening passes through the surface plate as described above, one side surface of the surface plate interferes with the wall and the saw blade cannot be brought close to the wall. Therefore, in order to cope with this, the surface plate is divided into a main base and a sub base, and one side of the main base extends to the extension of the front and rear of the saw blade, and further protrudes on the opposite side of the saw blade. There is known a configuration in which a portion to be complemented is complemented by a subbase. Specifically, the slide arm protrudes from the front and rear of the sub base so as to be orthogonal to the longitudinal direction of the sub base, while the main base is formed with a slide groove for slidably storing the slide arm. The sub-base can be connected to the main base by sliding the slide arm and pressing and fixing the end of the slide arm to the bottom of the slide groove with a fixing screw or the like. In addition, the cutting machine main body is tilted about the axis parallel to the cutting direction with respect to the surface of the material to be cut, and the cutting operation can be performed with the saw blade protruding outward from the side surface of the surface plate. . As a result, the lower surface of the main base and the sub base is usually brought into contact with the surface of the material to be cut and cut, but the sub base can be removed to perform the cutting operation.

  However, in the configuration in which the end portion of the slide arm is slid and fixed in the slide groove, the slide arm is not fixed easily, the sub-base is lifted upward and becomes movable, and a stable cutting operation is impaired. Therefore, it is conceivable to make the slide groove into a cylindrical hole, but it is almost impossible technically to configure the slide arm and the slide hole so that they can slide without clearance. Raising due to floating. Therefore, the height of the slide hole is made larger than that of the slide arm, and a step portion is formed at one corner of the upper portion, and a part of the upper surface of the slide arm is engaged with this step portion to prevent the sub base from floating. The one configured as described above is known (see Patent Document 1).

JP 2004-188738 A

  However, even in the above configuration, since the slide arm is configured to slide along the slide hole, the step portion is formed over the entire length of the slide hole, and high processing accuracy is required for the step portion and the slide arm, There was a problem that the manufacturing cost was high.

  The present invention eliminates the above-mentioned problems, prevents the sub-base from being lifted with a simple structure, can be stably attached to the main base, and can be used to stably cut a workpiece at all times. The challenge is to provide a machine.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a surface plate is disposed at a lower portion of a cutting machine main body having a cutting blade, and the surface base is supported by a main base that supports the cutting machine main body. And a sub-base detachably provided on the main base saw blade side by sliding, a slide arm projects from the side of the sub base to the main base side, and the main base A sub-base restricting portion is provided on the upper and lower surfaces of the base.

  According to a second aspect of the present invention, in the first aspect, the restricting portion is provided on the main base so as to press the sub-base from above, and a lower surface of the holding arm provided on the main base. And an upper surface of the receiving portion for receiving the power.

  According to a third aspect of the present invention, in the second aspect of the present invention, the sub-base is formed with a protrusion that can be engaged with the lower surface of the presser portion, and the main base is provided with a lower portion of the presser portion. A notch groove for receiving the protrusion is formed.

  According to the first aspect of the present invention, the slide base is formed to project from the side portion of the sub base to the main base side, and the sub base restricting portions are provided on the upper surface and the lower surface of the main base. Cannot be moved upward or downward by the restricting portion. Therefore, the sub-base does not float when cutting, the sub-base can be stably attached to the main base, and the material to be cut can always be stably cut.

  According to the second aspect of the present invention, since the restricting portion is formed of the upper surface of the receiving portion that receives the lower surface of the slide arm and the lower surface of the pressing portion that presses the sub base from above, The base is sandwiched between the receiving portion and the presser portion of the main base and cannot be lifted, so that there is no backlash. Therefore, the structure is simple and the cutting operation can be performed with the posture of the cutting machine stable regardless of the vibration generated during cutting or the adjustment of the operator's force. Durability is not impaired.

  According to the invention of claim 3, the sub-base is formed with a protrusion that can be engaged with the lower surface of the pressing portion, and the main base receives the protrusion at the lower portion of the pressing portion. Since the notch groove is formed, the lower surface of the protrusion also constitutes a part of the surface plate, and the protrusion is sandwiched between the surface of the workpiece and the holding part during cutting. The stability of the base can be further increased.

The perspective view of the portable cutting machine which concerns on this invention Perspective view with the sub-base removed Top view of the portable cutting machine Sectional drawing on the XX line of FIG. Sectional drawing on the YY line of FIG. A partial enlarged perspective view of the sub-base mounted on the main base as seen from the bottom

  In FIG. 1 to FIG. 3, the symbol A indicates a portable cutting machine. In this cutting machine A, an operating handle 4 is placed in parallel with the cutting direction of the saw blade 1 on the upper part of a cutting machine body 3 in which a saw blade 1 and an electric motor 2 for driving the saw blade 1 are arranged in parallel. That is, it is arranged in the front-rear direction, and a battery pack 5 for driving the electric motor is detachably provided at the lower part of the rear end of the handle 4, and the surface plate placed on the material to be cut at the lower part of the cutting machine body 3. 6 is provided.

  The output shaft of the electric motor 2 is operatively connected to the rotary shaft of the saw blade 1 through a speed reduction mechanism provided in the cutting machine body 3.

  The electric motor 2 is built in the motor housing. Most of the saw blade 1 is covered with a saw cover 7 for ensuring safety.

  The surface plate 6 is a metal plate-like member disposed in the lower part of the cutting machine body 3, and an opening 8 is formed through a part of the platen 6. The part is exposed and covered with an arc-shaped lower guard 10. The lower guard 10 is mounted so as to be rotatable upward from the rear about the rotation axis of the saw blade 1.

  When cutting the material to be cut by the cutting machine, the surface plate 6 is placed on the surface of the material to be cut and the switch is operated to transmit the rotational force of the electric motor 2 to the saw blade 1 via the speed reduction mechanism. The platen 6 may be moved along the surface of the material to be cut while pushing the handle 4.

  By the way, the most frequently used case is when the surface plate 6 and the saw blade 1 are used at a right angle, but it is necessary to incline the saw blade 1 and cut along the wall side when so-called cutting is performed. There can be. That is, it may be necessary to perform the cutting operation in a state where the cutting machine body 3 is inclined and the saw blade 1 protrudes outward from the side surface of the surface plate 6. In order to cope with this case, it is preferable that the left and right width of the surface plate 6 is up to the saw blade 1, and no more than that is protruded from the saw blade 1. Therefore, in the portable cutting machine, the surface plate 6 is divided into the main base 6a and the sub base 12, and when the above-described cutting is necessary, the sub base 12 can be removed and the main base 6a alone can be cut. It is like that.

  That is, the cutting machine body 3 having the saw blade 1 is arranged on the main base 6a. Further, one side end (right end portion toward the front side) of FIG. 2 of the main base 6 a is disposed so as to be substantially extended on the front and rear of the saw blade 1. A recess 8a (see FIG. 2) is cut out at the center of the one end, and the saw blade 1 is housed inside the recess 8a.

  The main base 6a supports the cutting machine main body 3 through a supporter 26 so as to be rotatable. Around the cutting machine main body 3, the amount of protrusion of the saw blade 1 from the lower surface of the main base 6a and the main A mechanism for adjusting the inclination angle of the saw blade 1 with respect to the base 6a is provided.

  Further, as shown in FIG. 2, grooved receiving portions 13 and 14 of the sub-base 12 are formed in parallel in the left-right direction from one side to the other side of the main base 6a. The upper portions of the receiving portions 13 and 14 are open. The front receiving part 13 is long in the left-right direction of the main base 6a, and the rear receiving part 14 is short. A fixing screw 15 is provided on the upper part of the front receiving part 13 and the rear receiving part 14 as fixing means for the sub-base 12. The fixing screw 15 can be moved up and down by rotation, and a coil spring 16 for preventing loosening is wound around the shaft portion.

  On the other hand, the sub-base 12 is formed by raising the rib 18 from the outer edge of the elongated plate-like portion 17, and the recess 8 b is notched in the central portion of the plate-like portion 17. Two parallel slide arms 20 and 21 having different lengths are formed so as to protrude from the upper surface of the front and rear portions of 17 in a direction perpendicular to the longitudinal direction of the plate-like portion 17. Of these slide arms 20, 21, the longer front slide arm 20 is slidably provided on the front receiving portion 13 of the main base 6a, and the short rear slide arm 21 is slidably provided on the rear receiving portion 14 of the main base 6a. ing.

  With the above configuration, when the sub base 12 is mounted on the main base 6a, the slide arms 20, 21 of the sub base 12 are slid along the front and rear receiving portions 13, 14 of the main base 6a. At the slide end, the tips of the slide arms 20 and 21 reach the lower positions of the front and rear fixing screws 15, so that each fixing screw 15 is tightened as shown in FIG. 4 and fixed to the receiving portions 13 and 14 by sliding the slide arms 20 and 21. To do. As a result, the main base 6a and the sub base 12 are integrally coupled to form the surface plate 6, and the lower surface of the main base 6a and the lower surface of the plate-like portion 17 of the sub base 12 are substantially flush with each other. The left and right width dimensions are sufficiently amplified. Then, the concave portion 8a of the main base 6a and the concave portion 8b of the sub base 12 are combined to form an integral opening 8 (see FIG. 1) surrounding the saw blade 1. Note that when the sub-base 12 is removed, the fixing screws 15 are loosened and the slide arms 20 and 21 are pulled out.

  By the way, with the above-described surface plate configuration, the front slide arm 20 is securely fixed at the distal end side with the fixing screw 15, but since the base side is free, it can float with respect to the main base 6a. There is sex. Therefore, the main base 6a is formed with a pressing portion 22 that presses the front portion of the sub-base 12 from above.

  The presser portion 22 is disposed in front of the front receiving portion 13. The presser portion 22 is thick to ensure strength, and as shown in FIGS. 4 and 5, a presser groove 25 opened downward is formed in the lower part, and the upper bottom surface 25a of the presser groove 25 is the main bottom surface 25a. It is formed so as to be higher than the lower surface of the base 6 a by the thickness of the plate-like portion 17 of the sub-base 12. As shown in FIG. 6, a notch groove 23 that opens to the sub-base side is formed in the lower part of the presser portion 22 by the presser groove 25.

  On the other hand, the sub-base 12 is formed with a protrusion 24 projecting from the position corresponding to the notch groove 23 toward the main base 6a at a position near the front slide arm 20 of the plate-like portion 17. Has been. The thickness of the protrusion 24 is the same as the thickness of the plate-like portion 17 and is large enough to enter the notch groove 23.

  According to the above configuration, when the sub base 12 is slidably coupled to the main base 6a, the protrusion 24 of the sub base 12 enters the inside of the notch groove 23 of the main base 6a. At this time, as shown in FIG. 6, the upper surface of the protrusion 24 engages while sliding along the lower surface of the presser portion 22, and the lower surface of the protrusion 24 is substantially flush with the lower surface of the main base 6a. .

  The protrusion 24 of the sub base 12 is formed so as to engage with the presser portion 22 of the main base 6a. However, there is a slight gap between the slide arms 20 and 21 of the sub base 12 and the receiving portions 13 and 14. Therefore, by sliding the sub base 12 while pressing the sub base 12 downward, the protrusion 24 of the sub base 12 can be smoothly slid without colliding with the pressing portion 22 of the main base 6a. The guide portion of the protrusion 24 may be formed by chamfering the end portion on the sub-base 12 side at the lower end of the presser portion 22.

  Finally, the slide arms 20 and 21 are pressed and fixed to the receiving portions 13 and 14 by tightening the front and rear fixing screws 15, and the main base 6a and the sub base 12 are integrally coupled to constitute the surface plate 6. . At the same time, the protrusion 24 at the front portion of the sub-base 12 engages with the holding portion 22 of the main base 6a and is pressed from above. Thereby, it becomes the structure by which the control part of the sub base 12 was provided in the main base 6a. That is, the main base 6a includes an upper regulating portion formed by the lower surface of the holding portion 22 that presses the sub base 12 (projecting portion 24) from above and a lower portion formed by the upper surface of the front receiving portion 13 that receives the slide arm 20 (lower surface). And a regulation part. Therefore, as shown in FIG. 5, the front slide arm 20 and the protrusion 24 provided at the front portion of the sub base 12 are configured such that the front slide arm 20 is the receiving portion 13 (lower regulating portion) of the main base 6 a. It is supported from below by the upper surface, and the protrusion 24 is pressed from above by the lower surface of the pressing portion 22 (upper restricting portion) of the main base 6a. That is, the front portion of the sub-base 12 is sandwiched between the receiving portion 13 and the presser portion 22 and is regulated so that it cannot be lifted. Therefore, the cutting operation can be performed in a state where the posture of the cutting machine body 3 is stable regardless of the vibration generated at the time of cutting or the force of the operator, and the operability is good. Moreover, durability is not impaired.

  Further, since the presser portion 22 and the protrusion 24 may be formed small at the side end portion of the main base 6a and the front portion of the sub-base 12, respectively, the structure is simple and can be formed with high accuracy.

  Further, the protrusion 24 is not only pressed from above, but also constitutes a part of the surface plate 6, so that it is sandwiched between the surface of the material to be cut and the pressing portion 22 at the time of cutting, and the sub-base 12 is More stable.

  In addition, since a screw or the like is not used to hold the sub-base 12 lifted up, no special work is required to press the sub-base 12.

  The restricting portion of the sub base 12 provided on the main base 6a may be any member that restricts the vertical movement of the sub base by the upper surface and the lower surface of the main base 6a. The configuration is not limited.

DESCRIPTION OF SYMBOLS 1 Saw blade 3 Cutting machine main body 6 Surface plate 6a Main base 12 Sub base 13 Receiving part (lower part regulation part)
14 Receiving part 22 Presser part (Upper restriction part)
23 Notch groove 24 Projection

Claims (3)

A surface plate is arranged at the bottom of the cutting machine main body having a saw blade for cutting, and the surface plate is detachably provided on the main base supporting the cutting machine main body and the main base saw blade side by sliding. In a portable cutting machine configured with a sub-base,
A portable cutting machine comprising: a slide arm projecting from a side of the sub base toward the main base; and a sub base restricting portion provided on an upper surface and a lower surface of the main base.   The restricting portion is configured by a lower surface of a pressing portion that is provided on the main base and presses the sub base from above, and an upper surface of a receiving portion that is provided on the main base and receives the lower surface of the slide arm. The portable cutting machine according to claim 1, characterized in that:   The sub-base is formed with a protrusion that can be engaged with the lower surface of the presser part, and the main base is formed with a notch groove for receiving the protrusion at the lower part of the presser part. The portable cutting machine according to claim 2, wherein

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