JP7438828B2 - portable cutting machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a portable cutting machine that performs cutting by being held and moved by an operator.

For example, there has been provided a portable cutting machine for metalworking, which is also called a tipped saw cutter and uses a tipped saw for metal cutting as a cutting tool. A tipped saw is a type of cutting blade in which the tip and base metal are made as separate parts and then integrated by welding. Conventionally, in portable cutting machines for metal processing, various measures have been taken to efficiently collect sparks generated during cutting and chips generated when the sparks solidify.

Patent Document 1 discloses a technique in which chips accumulated at the bottom of the teeth are smoothly guided to the dust collection box by appropriately setting the spacing between the tips of the teeth and the inner wall of the fixed cover. . Patent Document 2 discloses a technique for a cutting machine for wood processing in which a skirt portion is provided at the lower part of a front cover body to cover a chip generating portion to prevent chips from scattering to the outside. Patent Document 3 discloses a technique in which a sliding cover provided at the front of a fixed cover is provided with a protrusion in a cutting machine for wood processing, and the protrusion shields the area above the cutting area.

Japanese Patent Application Publication No. 2019-198912 Utility Model Publication No. 5-5333 Japanese Patent Application Publication No. 2002-18811

However, in the former technique disclosed in Patent Document 1, a small gap is set between the base and the front part of the fixed cover in order to avoid mutual interference. A small amount of chips may leak out through this gap. It is assumed that the leaked chips collide with the folded parts of the base and scatter. In this respect, it was necessary to further enhance the effect of preventing scattering of chips. According to the techniques for wood processing disclosed in Patent Documents 2 and 3, a member having poor durability against chips containing sparks is disposed inside the fixed cover, so it is difficult to use for metal processing. It was difficult to apply it to portable cutting machines. In contrast to these conventional techniques, it is necessary to further improve the scattering prevention effect (dust collection efficiency) of cutting powder (swarf) generated during cutting in a portable cutting machine for metalworking.

According to one feature of the present disclosure, a portable cutting machine includes a base having a lower surface that comes into contact with a cutting material, and a cutting machine main body supported on the upper surface side of the base. In addition, the portable cutting machine has a front cover part provided on the cutting machine body and covering the front periphery of the disc-shaped cutting blade, and a ruler attachment part provided on the base to which the parallel ruler is removably attached. . Furthermore, the portable cutting machine includes a shielding member, which is attached to the ruler attachment portion and covers a front gap formed between the front cover portion and the base, instead of the parallel ruler.

Therefore, by using the mounting portion of the parallel ruler, it is possible to shield cutting powder that scatters from the front gap between the base and the front cover portion. Thereby, the scattering of chips from the portable cutting machine can be more effectively prevented. Since it is configured to be attached using the attachment part of the parallel ruler, a large increase in cost can be avoided.

According to another feature of the present disclosure, the ruler attachment part is configured such that the shielding member can be attached and detached in the left and right directions intersecting the cutting progress direction. Therefore, a large space is not required for attachment and detachment. This improves the ease of handling for attaching and detaching the shielding member.

According to other features of the disclosure, the shielding member has a grip that is anti-slip treated. Therefore, the shielding member can be attached and detached by grasping the gripping portion. Accordingly, since the gripping portion is treated to prevent slipping, handling for attaching and detaching the shielding member is improved.

According to another feature of the present disclosure, plate-shaped legs of the parallel ruler are attached to the ruler attachment portion instead of the shielding member. The legs cover the front gap between the front cover part and the base. Therefore, even when the legs of the parallel ruler are attached instead of the shielding member, the cutting powder scattered from the front gap is blocked by the legs of the parallel ruler.

According to another feature of the present disclosure, the shielding member includes a guide portion for aligning the slit lines. The guide portion is provided in the shape of a cutout or has a mark. Therefore, the shielding member can also be used as a guide for aligning the slit lines. This facilitates the line alignment work.

According to another feature of the present disclosure, the shielding member includes a rod-shaped main body portion and an auxiliary shielding portion that stands upward from the main body portion in front of the front gap. Therefore, for example, when the cutting depth of the cutting blade is reduced and the front gap expands upward, the auxiliary shielding part prevents the cutting powder from leaking.

According to another feature of the present disclosure, the auxiliary shielding portion is formed of a leaf spring and elastically abuts on the front cover portion. Therefore, by elastically displacing the auxiliary shielding portion in accordance with the expansion and contraction of the front gap due to the displacement of the front cover portion, for example, leakage of cutting powder can be efficiently prevented.

According to other features of the disclosure, the shielding member has a spatula-like point at the end. Therefore, the shielding member can be removed from the ruler attachment part and the pointed part can be used as a scraper. For example, the shielding member can be used to scrape out cutting powder accumulated in the dust collection box.

According to another feature of the disclosure, the shielding member is provided with a dimensional scale. Therefore, the shielding member can be used as a measuring stick.

FIG. 1 is an overall perspective view of a portable cutting machine. This figure shows the parallel ruler attached. FIG. 1 is an overall perspective view of a portable cutting machine. This figure shows the parallel ruler removed. FIG. 3 is a view taken in the direction of arrow III in FIG. 2 and is a right side view of the portable cutting machine. FIG. 3 is a plan view of the portable cutting machine, taken in the direction of arrow IV in FIG. 2; FIG. 3 is a left side view of the portable cutting machine taken along the arrow V in FIG. 2; FIG. 3 is a view taken in the direction of arrow VI in FIG. 2 and is a front view of the portable cutting machine. FIG. 3 is a view taken in the direction of arrow VII in FIG. 2 and is a rear view of the portable cutting machine. FIG. 3 is a view taken in the direction of arrow VIII in FIG. 2 and is a bottom view of the portable cutting machine. FIG. 1 is an overall perspective view of a portable cutting machine. This figure shows a state in which the shielding member according to the first embodiment is attached. FIG. 2 is an enlarged vertical cross-sectional view of the shielding member and its surroundings according to the first embodiment. It is a perspective view of the shielding member concerning a 1st embodiment. FIG. 7 is a perspective view of a shielding member according to a second embodiment. FIG. 7 is an overall plan view of a portable cutting machine equipped with a shielding member according to a second embodiment. FIG. 7 is a perspective view of a shielding member according to a third embodiment. FIG. 7 is a longitudinal cross-sectional view of a portable cutting machine equipped with a shielding member according to a third embodiment. This figure shows a state where the depth of cut is set to the maximum. It is an enlarged view of section XVI in FIG. 15. FIG. 7 is a longitudinal cross-sectional view of a portable cutting machine equipped with a shielding member according to a third embodiment. This figure shows a state in which the depth of cut is set to the minimum. It is an enlarged view of section XVIII in FIG. 17. FIG. 7 is a perspective view of a shielding member according to a fourth embodiment. It is a perspective view of the shielding member concerning a 5th embodiment.

Next, embodiments of the present invention will be described based on FIGS. 1 to 20. 1 to 8 show a portable cutting machine 1 common to each embodiment. In each of the embodiments described below, a metalworking cutting machine, also called a chip saw cutter, is exemplified as the portable cutting machine 1. The portable cutting machine 1 includes a base 10 that is brought into contact with a cutting material W, and a cutting machine main body 20 that is supported on the upper surface side of the base 10. The base 10 has a rectangular flat plate shape, and its lower surface side is brought into contact with the upper surface of the cutting material W.

The cutting machine main body 20 includes an electric motor 21 as a driving source, a disc-shaped cutting blade 22, and a loop-shaped handle portion 23. As the electric motor 21, a brushless motor is used that has a high output and is compact in the motor axial direction. The electric motor 21 is housed in a cylindrical motor housing 21a.

The cutting blade 22 is made by welding a large number of chips along the periphery of a disc-shaped base metal at regular intervals in the circumferential direction, and a chip saw for cutting steel materials is used. .

Approximately half of the upper circumference of the cutting blade 22 (range on the upper surface side of the base 10) is covered with a fixed cover 24 and a part of the dust collection box 25. As shown in FIG. 4, the fixed cover 24 is hidden on the left side of the dust collection box 25. As shown in FIGS. 1 to 3, the front region of the cutting blade 22 located above the top surface of the base 10 is covered by a front cover portion 25a that forms the front region of the dust collection box 25. As shown in FIGS. This prevents cutting powder from scattering around.

A dust collection box 25 is arranged side by side on the right side of the fixed cover 24. Cutting powder generated at a portion (cutting portion C) where the cutting blade 22 cuts into the cutting material W is blown upward and flows into the front cover portion 25a that is the front portion of the dust collection box 25. Cutting powder blown up into the front cover portion 25a flows upward and backward and is collected in the dust collection box 25. The dust collection box 25 can be removed from the fixed cover 24 by loosening the fixing screws 26. A lid portion 29 is provided at the rear of the dust collection box 25 for discharging collected cutting powder. By removing the dust collecting box 25 and opening the lid part 29, the cutting powder collected inside can be discharged. This facilitates maintenance work for the dust collection box 25.

As shown in FIGS. 1 to 3, an arrow 28 indicating the direction of rotation of the cutting blade 22 is displayed on the right side of the dust collection box 25. Therefore, the cutting blade 22 rotates counterclockwise in FIG. 3. Therefore, cutting powder is blown upward at the cutting portion C by the counterclockwise rotating wind generated by the rotation of the cutting blade 22. A part of the cutting powder blown up from the cutting part C passes through the front gap 5 between the front cover part 25a of the dust collection box 25 and the base 10 and leaks diagonally upward to the front. The treatment of leaked cutting powder will be described later.

As shown in FIG. 8, the lower side of the cutting blade 22 is projected toward the lower surface side through a slot-shaped window 11 provided in the base 10. As shown in FIG. This protruding portion is cut into the material W to be cut, and the cutting process is performed. As shown in FIGS. 3 and 5, a movable cover 30 covers the periphery of the lower part of the cutting blade 22 that protrudes toward the lower surface of the base 10 (tooth tip). The movable cover 30 is provided so as to be able to rotate around the center of rotation of the cutting blade 22 to open and close the tips of the teeth. The movable cover 30 is relatively opened by moving the portable cutting machine 1 in the cutting progress direction with its tip end in contact with the material W to be cut. As shown in FIG. 8, the movable cover 30 is biased in the closing direction by a tension spring 30a interposed between the movable cover 30 and the fixed cover 24. As shown in FIG. The movable cover 30 prevents the cutting blade 22 from being exposed other than when necessary.

As shown in FIGS. 4 to 7, an electric motor is coupled to the left side of the fixed cover 24 via a reduction gear section 31. As shown in FIGS. The reduction gear section 31 has a configuration in which a gear train is housed in a cylindrical gear housing 31a. The rotational output of the electric motor 21 is reduced in speed by the reduction gear section 31 and output to the output shaft. Although not visible in the figure, the output shaft protrudes into the fixed cover 24. A cutting blade 22 is attached to an output shaft protruding into the fixed cover 24. A fixing screw 22a for fixing the cutting blade 22 to the tip of the output shaft is shown in FIGS. 1-3.

A support arm portion 32 is integrally provided at the front portion of the gear housing 31 a of the reduction gear portion 31 . The support arm portion 32 extends forward. A front portion of the support arm portion 32 is coupled to the upper surface of the base 10 via a vertically swinging support shaft 33. Two supporting walls 12 are integrally provided on the front upper surface of the base 10 and stand upwardly in parallel with each other. The front part of the support arm part 32 is sandwiched and connected between the two support wall parts 12. The vertical swing support shaft 33 coaxially passes through the support arm portion 32 and the two support wall portions 12 . Thereby, the cutting machine main body 20 is supported on the front upper surface of the base 10 via the vertical swing support shaft 33 so as to be swingable up and down. By swinging the cutting machine main body 20 up and down with respect to the base 10, the amount of protrusion of the cutting blade 22 toward the lower surface of the base 10 can be changed. By changing the amount of protrusion of the cutting blade 22 toward the lower surface of the base 10, the depth of cut into the material W to be cut by the cutting blade 22 can be changed.

A loop-shaped handle portion 23 is provided above the reduction gear portion 31. A trigger-type switch lever 23d is provided on the inner peripheral side of the handle portion 23. When the switch lever 23d is pulled upward with a fingertip, a main switch (not visible in the figure) installed in the handle portion 23 is turned on. When the main switch is turned on, the electric motor 21 starts. When the pull operation of the switch lever 23d is released, the main switch is turned off and the electric motor 21 is stopped.

A lock-off button 23e is provided at the top of the handle portion 23. The lock-off buttons 23e are arranged on both sides of the handle portion 23. When the lock-off button 23e is released on either side, the lock-off state is released and the switch lever 23d can be pulled and operated. Unless the lock-off button 23e is released, pulling of the switch lever 23d is prohibited, and careless starting operations that are not intended by the user are restricted. When the pull operation of the switch lever 23d is released, the release operation of the lock-off button is canceled. In addition, as shown in FIG. 6, the left and right lock-off buttons 23e have a cylindrical portion that protrudes from the handle portion 23 to the left and right, and the upper portion thereof faces outward to the left and right with respect to the lower portion. It is cut out and has a planar shape with an inclined upper part. Therefore, it is easy for the user to easily bring the tip surface of the user's finger into contact with the inclined plane portion of the lock-off button 23e. Further, the left and right lock-off buttons 23e are integrated with each other by their intermediate portions, and are horizontally movable in the left-right direction. When the user presses the inclined plane part of the upper part of the lock-off button 23e, the user can move the lock-off button 23e horizontally without feeling any discomfort while applying a little downward force, without having to move the lock-off button 23e strictly horizontally in the left-right direction. can be done.

A front portion 23a of the handle portion 23 is coupled to an upper portion of the gear housing 31a. A front portion 23a of the handle portion 23 stands upward from the top of the gear housing 31a. A grip portion 23b extends diagonally downward from the top of the front portion 23a. At the rear of the grip portion 23b, a strap connecting portion 23c is provided to which a tether strap or the like for fall prevention is connected. The rear side of the grip portion 23b is coupled to the rear surface side of the gear housing 31a via the battery attachment portion 35. One battery pack 36 is attached to the lower surface side of the battery attachment part 35.

The electric motor 21 operates using electric power from a battery pack 36 attached to a battery attachment part 35 as a power source. The battery pack 36 can be used repeatedly by being removed from the battery attachment part 35 and charged. As shown by the white arrow in FIG. 4, the battery pack 36 can be attached by sliding it to the right with respect to the battery attachment part 35, and can be removed by sliding it to the left.

A controller accommodating portion 37 is provided between the electric motor 21 and the battery mounting portion 35. The controller accommodating portion 37 accommodates a rectangular flat controller 38 that includes a control board for controlling the operation of the electric motor 21 .

In front of the reduction gear part 31 and at the lower part of the front part 23a of the handle part 23, a lighting fixture 39 using an LED (light emitting diode) as a light source is provided. The cutting part C (the part where the cutting blade 22 cuts into the material W to be cut) is brightly illuminated by the illumination tool 39, thereby facilitating cutting work in a dark place or the like. A guide portion 10b for aligning the slit lines is provided at the front end of the base 10. By aligning the guide portion 10b with the slot line displayed on the upper surface of the cutting material W, the cutting blade 22 is indirectly aligned with the slot line. The vicinity of the guide portion 10b is brightly illuminated by the lighting device 39, thereby facilitating positioning.

A lock lever 40 is protruded from the front part of the reduction gear part 31. When the lock lever 40 is pushed in, the output shaft to which the cutting blade 22 is attached is locked so that it cannot rotate. This makes it easier to replace the cutting tool.

A spanner holding portion 42 for holding an L-shaped hexagonal wrench key 41 is provided at the front of the motor housing 21a. As shown in FIG. 5, one holding hole 23f is provided at the base of the handle portion 23. By inserting the tip of the hexagonal wrench 41 into the holding hole 23f and holding the rear end elastically between the spanner holding parts 42, the hexagonal wrench 41 can be kept in the cutting machine body 20 at all times. . The hexagonal wrench wrench 41 is used to tighten the fixing screw 22a of the cutting blade 22. By permanently equipping the cutting machine body 20 with the hexagonal wrench wrench 41, the cutting blade 22 can be replaced quickly.

As shown in FIG. 4, a swing position fixing mechanism 45 is provided between the rear part of the fixed cover 24 and the base 10 to fix the vertical swing position of the cutting machine main body 20. The swing position fixing mechanism 45 includes an arc-shaped depth guide 46 provided on the upper surface of the base 10 and a fixing lever 47. The depth guide 46 is supported so as to be tiltable back and forth via a tilting support shaft 46a. A fixing screw 47a is coupled to the fixing lever 47. The fixing screw 47a is inserted into a guide groove of the depth guide 46 and is screwed into the left side of the fixing cover 24. The fixing screw 47a is tightened by tilting the fixing lever 47 downward, and the fixing screw 47a is loosened by tilting the fixing lever 47 upward. By tilting the fixing lever 47 downward and tightening the fixing screw 47a, the depth guide 46 is sandwiched. Thereby, the vertical swing position of the cutting machine main body 20 with respect to the base 10 is fixed, and the cutting depth is fixed. By tilting the fixing lever 47 upward and loosening the fixing screw 47a, the vertical swing position of the cutting machine body 20 can be changed and the depth of cut can be adjusted.

As shown in FIG. 1, a parallel ruler 2 can be attached to the front part of the base 10. The parallel ruler 2 functions as a guide for making the cutting blade 22 cut parallel to the side of the material W to be cut. The parallel ruler 2 has a flat ruler main body 3 and one leg 4 that extends in the left-right direction.

The parallel ruler 2 is attached to a ruler attachment part 15 provided at the front part of the base 10. The ruler attachment part 15 includes two holding parts 16 and one fixing part 17. Wall portions 10a are provided on the left and right sides of the base 10, respectively, in an upwardly folded manner. The left and right wall portions 10a mainly function as ribs for increasing the surface rigidity of the base 10. One holding portion 16 is provided on each of the left and right wall portions 10a. In this embodiment, a holding portion 16 and a holding hole for holding the parallel ruler 2 to the base 10 are formed. The holding portion 16 is formed in an L-shape so as to extend between the upper surface of the base 10 and the wall portion 10a.

The two supporting wall portions 12 described above are arranged between the left and right holding portions 16. A rectangular escape hole 12a is provided at the lower part of the two support wall parts 12. The two escape holes 12a are arranged on the same line as the left and right holding parts 16. Therefore, as shown in FIG. 1, the leg portion 4 of the parallel ruler 2 is inserted across the left and right holding portions 16, and is also inserted into the two escape holes 12a.

A fixing part 17 is provided between the left support wall part 12 and the left holding part 16. The fixing part 17 includes a pedestal part 17a and a fixing screw 18. The pedestal portion 17a has a gate shape that straddles above the upper surface of the base 10. A fixing screw 18 as a fixing member is screwed into the base portion 17a. When the fixing screw 18 is tightened, it moves downward. By tightening the fixing screw 18 and pressing its tip against the leg 4, the parallel ruler 2 is fixed.

When the fixing screw 18 is loosened, the leg portion 4 becomes movable in the left-right direction, and the position of the ruler body 3 can be adjusted. By adjusting the position of the ruler body 3, the distance between the cutting blade 22 and the edge of the cutting material W is adjusted. Moreover, the parallel ruler 2 can be removed from the ruler attachment part 15 by loosening the fixing screw 18 and moving the leg part 4 to the right and pulling it out from the holding part 16. FIG. 2 and subsequent figures show a state in which the parallel ruler 2 is removed.

In the portable cutting machine 1 according to the present embodiment, the cutting powder blows up from the cutting part C, is not blown into the front cover part 25a of the dust collection box 25, and is not blown into the front cover part 25a of the dust collection box 25. A scattering prevention structure 50 is provided to prevent cutting powder leaking forward through the front gap 5 between the lower end and the base 10 from scattering. The scattering prevention structure 50 of this embodiment has a structure in which a shielding member 51, which will be described below, is attached using the ruler attachment part 15 for attaching the parallel ruler 2.

9 and 10 show a portable cutting machine 1 equipped with a shielding member 51 according to the first embodiment. FIG. 11 shows the shielding member 51 removed from the ruler attachment part 15. The shielding member 51 is made of a metal material and has the same width and thickness as the leg portions 4 of the parallel ruler 2. The shielding member 51 has approximately the same length as the horizontal width of the base 10 . The shielding member 51 is attached to and removed from the ruler attachment part 15 by moving the shielding member 51 in the left-right direction with its longitudinal direction along the left-right direction. The shielding member 51 can be inserted and attached from either side of the right holding part 16 or the left holding part 16, and can be pulled out and removed. Further, the shielding member 51 can be attached or removed from either the left or right side by turning it horizontally or vertically upside down. The shielding member 51 is inserted into the left and right holding parts 16 and the escape hole 12a, and is attached along the left and right width direction of the base 10. The shielding member 51 is fixed by tightening the fixing screw 18.

As shown in FIG. 10, the shielding member 51 attached to the ruler attachment part 15 is located in front of the front gap 5 between the front lower end of the front cover part 25a of the dust collection box 25 and the base 10. Therefore, the front gap 5 is closed by the shielding member 51. Therefore, the shielding member 51 prevents the cutting powder leaking forward through the front gap 5 from scattering.

As shown in FIG. 11, both ends of the shielding member 51 are provided with gripping portions 51a knurled to prevent slipping. The user can attach and remove the shielding member 51 to the ruler attachment part 15 by grasping the grip part 51a. Handling of the shielding member 51 is improved by the grip portion 51a which has been subjected to anti-slip treatment. Instead of knurling, a rubber layer may be coated to form a non-slip portion.

According to the portable cutting machine 1 according to the first embodiment configured as above, the ruler attachment part 15 of the parallel ruler 2 is used to cut the gap between the base 10 and the front cover part 25a of the dust collection box 25. The front gap 5 is closed with a shielding member 51. Thereby, cutting powder leaking from the front gap 5 is blocked and prevented from scattering forward. Thereby, the scattering of chips from the portable cutting machine 1 can be more effectively prevented.

Further, according to the illustrated scattering prevention structure 50, the shielding member 51 is attached using the ruler attachment part 15 of the parallel ruler 2, so a large increase in cost can be avoided.

Furthermore, the shielding member 51 is moved in the left-right direction intersecting the cutting progress direction, attached to the ruler attachment part 15, and removed. Therefore, a large space is not required for installation and removal. This improves the ease of handling for attaching and detaching the shielding member 51 .

Various changes can be made to the shielding member 51 according to the first embodiment illustrated above. FIG. 12 shows a shielding member 52 according to a second embodiment. The shielding member 52 has a configuration in which a guide portion 52a for alignment is added to the shielding member 51 according to the first embodiment. The guide portion 52a is provided by cutting a V-groove into the outer surface of the shielding member 51. FIG. 13 shows a portable cutting machine 1 in which a shielding member 52 according to a second embodiment is attached to a ruler attachment part 15. As shown in the figure, the guide portion 52a of the shielding member 52 is aligned with the guide portion 10b for aligning the slit line. Thereby, the guide portion 52a can be used as a guide portion for aligning the slit lines. Since the guide portion 52a located closer to the cutting edge of the cutting blade 22 can be used as a guide portion for aligning the groove lines, the cutting blades 22 can be aligned more quickly and accurately.

FIG. 14 shows a shielding member 53 according to a third embodiment. The shielding member 53 includes a main body portion 53a and an auxiliary shielding portion 53b. The main body portion 53a has the same width and thickness as the leg portions 4 of the parallel ruler 2. As shown in the figure, in the third embodiment, knurling (non-slip portions) for forming left and right gripping portions of the main body portion 53a is omitted. Further, in the main body portion 53a according to the third embodiment, the guide portion 52a according to the second embodiment is omitted. Note that the shielding members 51 and 52 of the first and second embodiments can also be used as they are as the main body portion 53a.

The auxiliary shielding part 53b compensates for the lack of shielding function of the main body part 53a, and is made of leaf spring material. The auxiliary shielding part 53b is a separate member from the main body part 53a, and the two are not fixed to each other. The auxiliary shielding part 53b has a base part 53c located on the lower surface side of the main body part 53a, and an upright part 53d rising upward from the rear part of the base part 53c. The upper part of the upright part 53d is bent forward into an arc shape to form a sliding contact part 53e.

15 to 18 show a portable cutting machine 1 in which a shielding member 53 according to a third embodiment is attached to a ruler attachment part 15. The main body portion 53a and the auxiliary shielding portion 53b of the shielding member 53 are located in front of the front gap 5 between the front cover portion 25a of the dust collection box 25 and the upper surface of the base 10. When attaching the shielding member 53 to the ruler attachment part 15, by positioning the auxiliary shielding part 53b at the part that shields the front of the front gap 5 and tightening the fixing screw 18, the auxiliary shielding part 53b is placed in the part that shields the front part of the front gap 5. Fixed. The auxiliary shielding part 53b is fixed by tightening the fixing screw 18 so that the base part 53c is sandwiched between the main body part 53a and the base 10.

As shown in FIGS. 15 and 16, the upright portion 53d of the auxiliary shielding portion 53b is attached so as to substantially contact the front surface of the front cover portion 25a of the dust collection box 25. As a result, the front gap 5 is closed by the upright portion 53d of the auxiliary shielding portion 53b, and leakage of cutting powder is efficiently prevented. 17 and 18 show a state in which the cutting machine main body 20 is swung upward to reduce the cutting depth of the cutting blade 22. In this case, the front cover portion 25a of the dust collection box 25 has the vertical swing support shaft 33 and is displaced upward. Therefore, the lower end of the front cover portion 25a is separated from the base 10, and the front gap 5 is enlarged upward. Even in this case, the upright portion 53d of the auxiliary shielding portion 53b is located in front of the front gap 5, and leakage of cutting powder from the front gap 5 is prevented.

As shown in FIG. 18, when the cutting machine main body 20 is vertically swung around the vertically swiveling support shaft 33, the sliding portion 53e of the auxiliary shielding portion 53b comes into sliding contact with the front surface of the fixed cover 24. Further, the sliding portion 53e is elastically pressed against the front surface of the fixed cover 24 by the spring force of the upright portion 53d, and the upright portion 53d is returned to the upright position by the elastic force. Therefore, regardless of the vertical swing position of the cutting machine main body 20, the front gap 5 is shielded by the auxiliary shielding part 53b, and leakage of cutting powder is prevented.

19 and 20 show shielding members 54 and 55 according to fourth and fifth embodiments that have been further modified. A shielding member 54 according to a fourth embodiment shown in FIG. 19 has a grip portion 54a knurled to prevent slipping on one side, and a spatula-shaped sharpened portion 54b on the other side. When the shielding member 54 is removed from the ruler attachment portion 15, the sharpened portion 54b allows the shielding member 54 to be used as a scraper. For example, when removing the dust collection box 25 from the fixed cover 24 and discarding the cutting powder collected inside, the sharp part 54b of the shielding member 54 is inserted into the dust collection box 25 to efficiently remove the accumulated cutting powder. Can be scraped out well.

A dimension scale 55a is displayed on the shielding member 55 according to the fifth embodiment shown in FIG. The shielding member 55 according to the fifth embodiment can be removed from the ruler attachment part 15 and used as a ruler, for example, when measuring the dimensions of other parts.

As exemplified above, the shielding members 51 to 55 are attached to the ruler attachment portion 15 to prevent cutting powder from scattering. Moreover, the shielding members 54 and 55 according to the fourth and fifth embodiments can be removed from the ruler attachment part 15 and used as a scraper or a ruler. When the shielding members 51 to 55 are removed from the ruler attachment portion 15 and the parallel ruler 2 is attached, the leg portion 4 functions as a shielding member. Cutting powder leaking from the front gap 5 between the front lower end of the front cover portion 25a of the dust collection box 25 and the upper surface of the base 10 is blocked by the leg portions 4 and prevented from scattering.

Further changes can be made to the embodiment described above. For example, although the shielding members 51 to 55 have approximately the same width and thickness as the leg portions 4 of the parallel ruler 2, the shielding members 51 to 55 may have a larger width and thickness as long as they can pass through the holding portion 16, the relief hole 12a, and the fixing portion 17. Alternatively, the shielding member may have a smaller width and thickness.

Further, it is possible to apply a shielding member that is longer or shorter than the illustrated shielding members 51 to 55. It is sufficient that the shielding member has a length such that it is positioned astride the holding part 16 and the fixing part 17 on at least one side, and is positioned at least in front of the front gap 5.

Furthermore, the shielding member may be made of resin. In this case, heat-resistant resin is more desirable. The shielding member is not limited to the shape of a band plate, but may be shaped like a round bar, a pipe, or a square bar, provided that it can be inserted through the holding part 16, the relief hole 12a, and the fixing part 17. In this case, a semicircular opening may be added to the holding portion 16 or the like, and the shielding member may be inserted therethrough.

When the support wall portion 12, which is the support portion of the cutting machine body 20 with respect to the base 10, is located at a position shifted forward and backward from the illustrated portion, interference with the shielding member can be avoided, so the relief hole illustrated is 12a can be omitted.

Moreover, although the ruler attachment part 15 to which the parallel ruler 2 having one leg part 4 is attached is illustrated, the ruler to which the parallel ruler is attached has two mutually parallel legs fixed at the front and rear parts of the base. The scattering prevention structure 50 illustrated for the attachment part can be applied.

The incidental functions of the illustrated shielding members 51 to 55, such as the knurling of the grip portion 51a, the guide portion 52a, the auxiliary shielding portion 53b, the pointed portion 54b, and the dimension scale 55a, may be appropriately combined to form one shielding member. I can do it.

In addition, although the configuration in which the front part of the cutting blade 22 is covered by the front part (front cover part 25a) of the dust collection box 25 arranged in parallel on the side of the fixed cover 24 has been illustrated, for example, if the dust collection box is not provided, The dust scattering prevention structure exemplified above can be applied to the configuration in which the front part of the fixed cover or another part is used as the front cover part to cover the front part of the cutting blade 22.

As the portable cutting machine 1, a cutting machine for metalworking, also called a chip saw cutter, is shown as an example, but it is also equipped with a portable circular saw for cutting woodwork equipped with a normal saw blade, or a rotating disk-shaped diamond wheel as a cutting tool. It can be widely applied to other types of portable cutting machines such as cutters.

1...Portable cutting machine (chipsaw cutter)
W... Cutting material C... Cutting part 2... Parallel ruler 3... Ruler body 4... Legs 5... Front gap 10... Base 10a... Wall part, 10b... Guide part 11... Window part 12... Support wall part 12a... Escape hole 15 ...Ruler mounting part 16...Holding part 17...Fixing part 17a...Pedestal part 18...Fixing screw 20...Cutting machine body 21...Electric motor (brushless motor)
21a...Motor housing 22...Cutting blade 22a...Fixing screw 23...Handle part 23a...Front part, 23b...Grip part, 23c...Strap coupling part 23d...Switch lever, 23e...Lock-off button, 23f...Holding hole 24...Fixing cover 25...Dust collection box 25a...Front cover part 26...Fixing screw 28...Arrow 29...Lid part 30...Movable cover 30a...Tension spring 31...Reduction gear part 31a...Gear housing 32...Support arm part 33...Vertical swing support shaft 35...Battery attachment part 36...Battery pack 37...Controller housing part 38...Controller 39...Lighting device 40...Lock lever 41...Hexagonal wrench wrench 42...Spanner holding part 45...Owing position fixing mechanism 46...Depth guide 47...Fixing lever 47a... Fixing screw 50... Scattering prevention structure 51... Shielding member (first embodiment)
51a...Gripping part (knurling)
52... Shielding member (second embodiment)
52a...Guiding part 53...Shielding member (third embodiment)
53a...main body part, 53b...auxiliary shielding part, 53c...base part, 53d...standing part, 53e...sliding contact part 54...shielding member (4th embodiment)
54a...gripping part, 54b...pointed part 55...shielding member (fifth embodiment)
55a...Dimension scale

Claims (9)

A portable cutting machine,
a base having a lower surface that abuts the cutting material;
a cutting machine main body supported on the upper surface side of the base;
a front cover part provided on the cutting machine main body and covering the front periphery of the disc-shaped cutting blade;
a shielding member that is removably attached to the base, and is entirely located above the lower surface of the base when attached, covering a front gap formed between the front cover portion and the base; death,
The shielding member is a portable cutting machine having a grip treated with anti-slip treatment . A portable cutting machine,
a base having a lower surface that abuts the cutting material;
a cutting machine main body supported on the upper surface side of the base;
a front cover part provided on the cutting machine main body and covering the front periphery of the disc-shaped cutting blade;
a shielding member that is removably attached to the base, and is entirely located above the lower surface of the base when attached, covering a front gap formed between the front cover portion and the base; death,
The shielding member is a portable cutting machine having a notch-shaped guide part or a guide part provided with a mark for aligning the slit lines . A portable cutting machine,
a base having a lower surface that abuts the cutting material;
a cutting machine main body supported on the upper surface side of the base;
a front cover part provided on the cutting machine main body and covering the front periphery of the disc-shaped cutting blade;
a shielding member that is removably attached to the base, and is entirely located above the lower surface of the base when attached, covering a front gap formed between the front cover portion and the base; death,
The shielding member is a portable cutting machine having a rod-shaped main body and an auxiliary shielding part that stands upward from the main body in front of the front gap . A portable cutting machine,
a base having a lower surface that abuts the cutting material;
a cutting machine main body supported on the upper surface side of the base;
a front cover part provided on the cutting machine main body and covering the front periphery of the disc-shaped cutting blade;
a shielding member that is removably attached to the base, and is entirely located above the lower surface of the base when attached, covering a front gap formed between the front cover portion and the base; death,
The shielding member has a rod-shaped main body part and an auxiliary shielding part that stands upward from the main body part in front of the front gap, and the auxiliary shielding part is formed of a leaf spring as a material and elastically closes the front gap. A portable cutting machine that is in contact with the front cover area . A portable cutting machine,
a base having a lower surface that abuts the cutting material;
a cutting machine main body supported on the upper surface side of the base;
a front cover part provided on the cutting machine main body and covering the front periphery of the disc-shaped cutting blade;
a shielding member that is removably attached to the base, and is entirely located above the lower surface of the base when attached, covering a front gap formed between the front cover portion and the base; death,
The shielding member is a portable cutting machine having a spatula-like sharpened portion at the end . A portable cutting machine,
a base having a lower surface that abuts the cutting material;
a cutting machine main body supported on the upper surface side of the base;
a front cover part provided on the cutting machine main body and covering the front periphery of the disc-shaped cutting blade;
a shielding member that is removably attached to the base, and is entirely located above the lower surface of the base when attached, covering a front gap formed between the front cover portion and the base; death,
A portable cutting machine in which the shielding member is provided with a dimensional scale . A portable cutting machine,
a base having a lower surface that abuts the cutting material;
a cutting machine main body supported on the upper surface side of the base;
a front cover part provided on the cutting machine main body and covering the front periphery of the disc-shaped cutting blade;
a ruler attachment part provided on the base to which a parallel ruler is removably attached;
a shielding member that is removably attached to the base, and is entirely located above the lower surface of the base when attached, covering a front gap formed between the front cover portion and the base; death,
In the portable cutting machine , the shielding member is attached to the ruler attachment part instead of the parallel ruler . The portable cutting machine according to claim 7 ,
In the portable cutting machine, the ruler attachment part is configured such that the shielding member can be attached and detached in a left-right direction that intersects with a direction of cutting progress by the disc-shaped cutting blade . The portable cutting machine according to claim 7 or 8 ,
In the portable cutting machine, plate-shaped legs of the parallel ruler are attached to the ruler attachment part instead of the shielding member, and the legs cover the front gap between the front cover part and the base.

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