JP2016135532A - Electric cutter with dust collecting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric cutter with a dust collecting function which achieves small friction resistance between a cover bottom surface and a ground material surface, avoids blocking a visual field, keeps high stability, and unfailingly collects dust.SOLUTION: A part of a rotary blade 9 driven by a motor incorporated in an electric cutter 1 is covered by a first cover 4 and a second cover 5. A front wheel 11 rotatably sandwiched in the cover is installed at a distal end part in a cutting direction of an entire structure. A dust discharge duct 22 which leads from an interior part of the cover to an exterior part is provided above the front wheel 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electric cutting machine with a dust collecting function, which is provided with a cover for collecting dust generated mainly when cutting concrete or stone using a rotary blade.

  Generally, when cutting concrete or stone, etc., it is often done with an electric cutting machine equipped with a dedicated rotary blade, but when cutting, a large amount of dust is scattered, which not only worsens the visibility at the work site. Could harm the health of workers.

  In order to improve the above situation, for example, in Patent Document 1, a part of a rotary blade mounted on an electric cutting machine is covered with a cover, and a dust collector is connected to a dust discharge duct that communicates from the inside of the cover to the outside. In this method, the frictional resistance generated by the sliding contact between the bottom surface of the cover and the surface of the work material may hinder smooth work. there were.

  Therefore, in the method proposed in Patent Document 2, in addition to the structure described above, a wheel is attached to the bottom surface of the cover to reduce the frictional resistance with the work material. In addition, by using the wheel, a gap is generated between the bottom surface of the cover and the work material, but in order to prevent dust from leaking out, it always comes into contact with the work material surface in front of the cutting direction in which the dust scatters. A movable dust guide plate is provided.

  Further, in actual work, a method (called plunge cut) is often used in which the cutting is performed by lowering the rotary blade from above while tilting the tool body and applying the cutting edge of the cover to the surface of the work material. However, with this method, it is theoretically possible that dust that scatters in a substantially horizontal direction at the moment when the rotary blade contacts the surface of the work material is also guided into the cover by the action of the dust guide plate. .

  JP 2008-307643 A   Japanese Patent No. 5093464

  As described above, in order to reduce the frictional resistance between the bottom surface of the cover and the work material and to reliably collect dust, the wheels and dust guide plates are used as in the method proposed in Patent Document 2. The configuration was valid.

  However, in this method, when the operator tries to visually observe the vicinity of the cutting portion of the rotary blade from the side of the cover, the dust guide plate blocks a part of the field of view.

In order to correctly cut the portion intended by the operator, it is preferable that the field of view near the cutting portion of the rotary blade is as open as possible, and in this respect, this method is not perfect.
Furthermore, in this method, the cover width is smaller than the overall configuration and the stability of the bottom of the cover is low. The dust could leak out and could not be closed.

  The object of the present invention is to solve the problems of the conventional methods described above, and there is little frictional resistance between the bottom surface of the cover and the surface of the work material. An object of the present invention is to realize an electric cutting machine with a dust collecting function that can reliably collect dust.

  In order to achieve the above object, the present invention provides an electric cutting machine that drives a rotary blade with a built-in motor, a cover that covers a part of the rotary blade, a dust discharge duct that communicates from the inside of the cover to the outside, and a lower end of the cover In the electric cutting machine with a dust collecting function having a front wheel axially attached by a support shaft in front of the cutting direction of the part, the front wheel is rotatably held inside the cover and installed at the most advanced part of the entire configuration It is characterized by that.

  Further, the present invention is characterized in that a cylindrical part having a width about 0.1 mm to 1 mm larger than the front wheel is inserted between the front wheel and the support shaft.

  Further, the present invention is characterized in that auxiliary wheels having the same outer diameter as the front wheels are provided on the extension line of the support shaft.

  The present invention is characterized in that the arm is horizontally mounted on the extension line of the support shaft in parallel to the cutting direction.

  Further, the present invention is characterized in that a rear wheel is pivotally mounted behind the front wheel at the lower end of the cover.

  The present invention is characterized in that a mark line is provided around the outer peripheral portion of the front wheel at the blade thickness center position in the rotation axis direction of the rotary blade.

  Further, the present invention is characterized in that a groove is provided in the outer peripheral portion of the front wheel at the position of the blade thickness center in the rotation axis direction of the rotary blade, and a ring made of an elastic body is mounted inside the groove.

  According to the first aspect of the present invention, the front wheel is rotatably held inside the cover, and is installed at the foremost portion in front of the cutting direction of the entire configuration, so that the above-mentioned plunge cut is performed as well as during normal cutting. The front wheel in contact with the work surface also blocked the dust without blocking the field of view near the cutting part of the rotary blade, guided to the inside of the cover, and connected to the dust discharge duct part. It is possible to collect with the suction power of the dust collector.

  According to the invention described in claim 2, by inserting a cylindrical part (sleeve) having a width about 0.1 mm to 1 mm larger than the front wheel between the front wheel and the first support shaft, the front wheel Therefore, the front wheel can rotate smoothly under any circumstances.

  According to the third aspect of the invention, the auxiliary wheel having the same outer diameter as that of the front wheel is provided on the extension line of the support shaft so that the cover is less inclined and the degree of adhesion between the front wheel and the work material is reduced. It is possible to increase the dust collection rate.

  According to the fourth aspect of the invention, it is possible to improve the stability of the bottom surface of the cover by laying the arm fixed parallel to the cutting direction on the extension line of the support shaft.

  According to the fifth aspect of the present invention, by attaching the rear wheel to the rear of the front wheel, the frictional resistance between the bottom surface of the cover and the work material can be further reduced, and the cutting operation can be facilitated. is there.

  According to the sixth aspect of the present invention, by providing a mark line around the outer peripheral portion of the front wheel at the center position of the blade thickness in the rotational axial force direction of the rotary blade, the rotary blade inside the cover is separated from the mark line. It is possible to recognize the position.

  According to the seventh aspect of the present invention, a groove is provided in the outer peripheral portion of the front wheel at the center position of the blade thickness in the rotation axis direction of the rotary blade, and a ring made of an elastic body is mounted inside the groove. It is possible to recognize the position of the rotary blade inside the cover by using the ring as a mark line that does not wear even after long-term use.

The perspective view of the electric cutting machine with a dust collecting function by this invention Development view of an electric cutting machine with a dust collecting function according to the present invention. Left side view of an electric cutting machine with a dust collecting function according to the present invention The image figure which shows one use situation of the electric cutting machine with dust collection function by this invention The image figure which shows one use situation of the electric cutting machine with dust collection function by this invention The image figure which shows one operation condition of the electric cutting machine with a dust collecting function by this invention The image figure which shows one operation condition of the electric cutting machine with a dust collecting function by this invention AA line sectional view of an electric cutting machine with a dust collecting function according to the present invention. Development view of an electric cutting machine with a dust collecting function according to the present invention. BB sectional view of the electric cutting machine with a dust collecting function according to the present invention. The partial front view of the electric cutting machine with a dust collecting function by this invention CC sectional view of the electric cutting machine with a dust collecting function according to the present invention.

  Hereinafter, the basic structure of the embodiment of the present invention will be described.

  As shown in FIG. 1, the electric cutting machine with a dust collecting function according to the present invention has the electric cutting machine 1 attached to the inner guard 3 via the adapter 2, and the first cover 4 and the second cover 5 are connected to the inner guard 3. It is combined in the state of holding.

As shown in FIG. 2, the electric cutting machine 1 has a drive shaft 6 that is rotationally driven by a built-in motor (not shown), and rotates between a pedestal washer 7 and a fixed washer 8 mounted on the drive shaft 6. The blade 9 is clamped and fixed.
A handle 10 is attached to a part of the outer portion of the electric cutting machine 1.

  The first cover 4 and the second cover 5 sandwich the inner guard 3 and the front wheel 11 at the foremost part, and from the outside of the first cover 4, the first support shaft 12 penetrates each configuration. The second cover 5 is fixed with screws 13 from the outside.

As shown in FIG. 3, an arc-shaped elongated hole 14 centering on the first support shaft 12 is provided in front of the second cover 5, and the knob bolt 15 is inserted into the inner guard 3 side through the elongated hole 14. The inner guard 3 is pressure-bonded to the second cover 5 by being fastened to the screw holes 16 provided in the first cover 5.
In the figure, the knob bolts 15 are provided at two locations, but may be provided at one location or at three or more locations.

  A retractable hook 17 is mounted on the front surface of the second cover 5, and a spring (not shown) incorporated under the lever 18 of the hook 17 has a hook tip 19 penetrating on the second cover 5. The hook 19 is urged so as to always pass through the provided through hole 20 and protrude to the inside of the second cover 5, and the hook tip 19 is on the inner guard 3 in the arc direction centered on the first support shaft 12. It engages with a plurality of slots 21 penetrating therethrough.

A dust discharge duct 22 leading to the outside is formed above the front wheel 11, and a hose connector 23 is sandwiched between the first cover 4 and the second cover 5 at the tip of the dust discharge duct 22. . A rail 24 is provided in the holding portion of the hose connector 23 of the first cover 4 and the second cover 5, and a rail groove 25 is provided in the holding portion of the hose connector 23. It plays the role of preventing the connector 23 from coming off.
The hose connector 23 is connected to a hose 26 of a dust collector (not shown). By rotating the hose connector 23, the hose 26 can be directed in an arbitrary direction.

  When cutting using the electric cutting machine with a dust collecting function configured as described above, the electric cutting machine 1 is first turned on and the rotary blade 9 is driven. Then, as shown in FIG. Is put on the surface of the concrete piece 27 and the electric cutting machine 1 is pushed forward. When the rotary blade 9 comes into contact with the concrete piece 27, dust 28 scatters forward in the rotational direction of the rotary blade 9. However, the dust 28 flows upward along the inner wall 29 inside the cover by the suction force of the dust collector, and the hose 26 And collected in the dust collector.

  On the other hand, even in the case of performing the above-described plunge cut, as shown in FIG. 5, the front wheel 11 located at the forefront serves as a pivot for the lowering operation of the electric cutting machine 1, and the gap in the front in the cutting direction is set. In order to block, the initial dust 30 that scatters almost horizontally at the moment when the rotary blade 9 touches the concrete piece 27 is also dammed up by the front wheel 11, and then is taken into the cover by the suction force of the dust collector and collected as described above. Is possible.

  A window 31 is opened in front of the side surface of the first cover 4, but dust generated at the time of cutting has high directivity and is concentrated and scattered in front of the rotary blade 9 in the rotational direction. As long as is acting, dust hardly leaks from the window 31 or the side gap.

  In any of the cutting methods, there is hardly anything that obstructs the field of view near the cutting portion of the rotary blade 9, and the operator can always visually check the state near the cutting portion of the rotary blade 9 from the window 31. .

  Further, if the knob bolt 15 is loosened and the lever 18 is pressed to release the hook tip 19 from the slot 21, the inner guard 3 rotates around the first support shaft 12 inside the cover as shown in FIG. It becomes possible to adjust the cutting amount 32 of the rotary blade 9. The slot 21 is disposed so that the cut amount 32 is engaged with the hook tip 19 at a position where the cut amount 32 is 10 mm, 20 mm or the like, and is useful when the cut amount 32 is easily adjusted to these values. is there.

  As shown in FIG. 7, if the inner guard 3 is exposed from the inside of the cover by the above rotation operation, the rotary blade 9 can be replaced by removing the fixed washer 8 with the tool 33.

  Next, other embodiments of the present invention will be described.

  In the embodiment shown in FIG. 8, a cylindrical part (sleeve 34) having a width about 0.1 mm to 1 mm larger than the front wheel 11 is inserted between the front wheel 11 and the first support shaft 12. Both ends of the sleeve 34 are in contact with the inner guard 3 and the first cover 4 to ensure a space where the front wheel 11 can be installed, so that the front wheel 11 can be connected to the inner guard 3 and the first cover under any circumstances. 4 can be smoothly rotated without being crimped.

  In the embodiment shown in FIG. 9, since the auxiliary wheel 35 having the same outer diameter as that of the front wheel 11 is mounted on the extension of the first support shaft 12, the cover is not easily tilted during the operation, and as a result, the front wheel 11 and the work material can be increased, and the dust collection rate can be further improved.

  In the embodiment shown in FIG. 9, the arm 36 is fixed on the extension of the first support shaft 12 in parallel to the cutting direction. The first support shaft 12 has two widths 37 formed on the first support shaft 12, and each of the first support shafts 12 is fitted with a width width 38 formed in the passage of the first cover 4 and the second cover 5. Since the arm 36 has a structure that does not move, the stability of the bottom surface of the cover can be improved.

  In the embodiment shown in FIG. 10, the rear wheel 39 is pivotally mounted by the second support shaft 40 between the first cover 4 and the second cover 5 behind the front wheel 11. It is possible to further reduce the frictional resistance between the workpiece and the work material and smooth the cutting operation.

  Further, in the embodiment shown in FIG. 11, the mark line 42 is provided around the outer peripheral portion of the front wheel 11 on the blade thickness center position line 41 in the rotation axis direction of the rotary blade 9. The position of the rotary blade 9 can be recognized.

  In the embodiment shown in FIG. 12, a groove 43 is provided around the outer peripheral portion of the front wheel 11 on the blade thickness center position line 41, and a ring 44 made of an elastic body is mounted inside the groove 43. Can be used as a mark line that does not wear even after long-term use.

DESCRIPTION OF SYMBOLS 1 Electric cutting machine 2 Adapter 3 Inner guard 4 First cover 5 Second cover 6 Drive shaft 7 Base washer 8 Fixed washer 9 Rotary blade 10 Handle 11 Front wheel 12 First spindle 13 Screw 14 Long hole 15 Knob bolt 16 Screw hole 17 Hook 18 Lever 19 Hook tip 20 Passing hole 21 Slot 22 Dust discharge duct 23 Hose connector 24 Rail 25 Rail groove 26 Hose 27 Concrete piece 28 Dust 29 Inner wall 30 Initial dust 31 Window 32 Cut amount 33 Tool 34 Sleeve 35 Auxiliary wheel 36 Arm 37 Width across flats 38 Width across flats 39 Rear wheel 40 Second spindle 41 Blade thickness center line 42 Mark line 43 Groove 44 Ring

Claims (7)

  An electric cutting machine that drives the rotary blade with a built-in motor, a cover that covers a part of the rotary blade, a dust discharge duct that communicates from the inside of the cover to the outside, and a shaft supported by a support shaft in front of the cutting direction at the lower end of the cover An electric cutting machine with a dust collecting function, wherein the electric cutting machine with a dust collecting function includes a front wheel, and the front wheel is rotatably held inside a cover and installed at the most advanced portion of the entire configuration.   2. The electric cutting machine with a dust collecting function according to claim 1, wherein a cylindrical part having a width of about 0.1 mm to 1 mm larger than the front wheel is inserted between the front wheel and the support shaft.   The electric cutting machine with a dust collecting function according to claim 1, wherein auxiliary wheels having the same outer diameter as the front wheels are provided on an extension line of the support shaft.   The electric cutting machine with a dust collecting function according to claim 1, wherein an arm is horizontally mounted on an extension line of the support shaft in parallel with the cutting direction.   The electric cutting machine with a dust collecting function according to claim 1, wherein a rear wheel is pivotally mounted behind the front wheel at the lower end of the cover.   The electric cutting machine with a dust collecting function according to claim 1, wherein a mark line is provided around an outer peripheral portion of the front wheel at a blade thickness center position in the rotation axis direction of the rotary blade.   2. The groove according to claim 1, wherein a groove is provided in an outer peripheral portion of the front wheel at a center position of the blade thickness in the rotation axis direction of the rotary blade, and a ring made of an elastic body is mounted inside the groove. Electric cutting machine with dust collecting function.

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