JP2018187705A - Portable cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable cutter including a dust box which can prevent back flow of chips without causing clogging with the chips.SOLUTION: A portable cutter includes: a motor; a saw blade 12 which rotates by the motor and cuts a cut material; and a dust box 30 which is disposed above the saw blade 12 so as to gather chips by utilizing impulse caused by discharge of the chips when the saw blade 12 cuts the cut material. Outflow prevention parts 45 (a first rib 45a, a second rib 45b, and a third rib 45c) are formed protruding on an inner upper surface of the dust box 30.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a portable cutting machine that rotates a saw blade to cut a material to be cut, and more particularly to a portable cutting machine that includes a dust box.

  A portable cutting machine equipped with a dust box is capable of collecting chips generated at the time of cutting with a dust box by using the discharge momentum of chips when a saw blade cuts a workpiece. Since the diffusion of the chips is suppressed by collecting the chips with the dust box, the operator can work without worrying about the chips (for example, see Patent Document 1).

Japanese Patent No. 3314295

  By the way, since such a portable cutting machine is used in various postures, it is desirable to prevent chips from flowing out from the entrance even when the entrance of the dust box is directed downward, for example.

  In order to prevent such a backflow of chips, for example, a method of narrowing a chip flow path is conceivable. However, there is a problem that the chips are easily clogged when the chip flow path is narrowed.

  Then, this invention makes it a subject to provide the portable cutting machine provided with the dust box which can prevent the backflow of a chip without clogging a chip.

  The present invention has been made to solve the above-described problem, and includes a motor, a saw blade that is rotated by the motor to cut the workpiece, and the saw blade cuts the workpiece. A dust box disposed above the saw blade in order to collect the chips by using the discharge momentum of the chips, and an outflow prevention portion is formed to protrude on the inner upper surface of the dust box It is characterized by.

  The present invention is as described above, and since the outflow prevention part protrudes on the inner upper surface of the dust box (the surface far from the saw blade), the outflow prevention part can prevent backflow of chips. it can. For example, when the inlet of the dust box is directed downward, even if the chips try to fall in the direction of the dust box through the inner upper surface of the dust box, the outflow prevention unit can prevent the chips from falling. Moreover, since it is not necessary to narrow the chip flow path in order to prevent the backflow of the chips, the chips are not easily clogged. Therefore, the backflow of the chips can be prevented without clogging the chips.

It is an external view of a portable cutting machine. It is a right view of a portable cutting machine. It is a front view of a portable cutting machine. It is an AA line sectional view of a portable cutting machine. It is the B section enlarged view of a portable cutting machine. It is a partially expanded view near the outflow prevention part.

  Embodiments of the present invention will be described with reference to the drawings. In the following description, the front is “front” and the rear is “rear” when viewed in the cutting direction. Further, the right side is “right” and the left side is “left” as viewed from the operator having the portable cutting machine 10. Further, when the base 55 is placed on the material to be cut, the upper side is “upper” and the lower side is “lower”.

  The portable cutting machine 10 which concerns on this embodiment is provided with the cutting machine main body 11 and the base 55 attached to the lower part of the cutting machine main body 11 as shown in FIGS.

  The cutting machine main body 11 has a built-in motor 16a and a saw blade 12 that is rotatably supported. The saw blade 12 is driven by a motor 16a and rotates around a rotating shaft 12a. This portable cutting machine 10 cuts a material to be cut by pressing a rotating saw blade 12 against the material to be cut.

  The base 55 is a metal plate-like member that comes into contact with the material to be cut, and exposes a part of the saw blade 12 from the opening 55a formed therethrough. Thus, the material to be cut is cut using the saw blade 12 exposed below the base 55.

  The cutting machine body 11 described above is entirely covered with a housing 15. The housing 15 according to the present embodiment is formed by combining a plurality of members, and includes a motor housing part 16, a grip part 17, and a saw cover part 20.

  The motor housing portion 16 is a part in which the motor 16a described above is built. In the present embodiment, the motor housing portion 16 is disposed on the left side of the grip portion 17.

  The grip portion 17 is a portion provided so as to protrude upward so that the operator can hold it. The grip portion 17 according to this embodiment is formed in a rod shape extending in the front-rear direction. A trigger 18 for executing a cutting operation is provided inside the grip portion 17 so as to be operable. The trigger 18 is disposed at a position where the index finger is applied when the operator grips the grip portion 17. When the operator pulls the trigger 18, the motor rotates and the saw blade 12 rotates. It is supposed to be.

  The saw cover part 20 is a part that covers the upper part of the saw blade 12. Inside the saw cover portion 20, a guide path 21 is formed for guiding chips generated when the saw blade 12 cuts the workpiece. Specifically, as shown in FIGS. 4 and 5, a passage surrounded by four sides is formed inside the saw cover portion 20 by the upper wall 21a, the lower wall 21b, and the pair of left and right side walls 21e. The guide path 21 is formed by this passage. An inflow port 21 c that is an inlet of the guide path 21 is opened so as to face the front end of the saw blade 12. In addition, an outlet 21 d that is an outlet of the guide path 21 is opened rearward above the saw blade 12. In the present embodiment, a dust box 30 is provided so as to be continuous with the guide path 21.

  The dust box 30 collects swarf using the scouring force of the swarf when the saw blade 12 cuts the workpiece. The dust box 30 according to the present embodiment is detachable from the housing 15. The dust box 30 is disposed above the saw blade 12.

  Further, an exhaust port 25 communicating with an exhaust port 36 of a dust box 30 described later is provided on the upper surface of the saw cover portion 20. As shown in FIG. 5, the discharge port 25 opens upward, and engages with and communicates with the exhaust port 36 when the dust box 30 is attached. A lower portion of the discharge port 25 is a housing portion for the saw blade 12. For this reason, the inside of the dust box 30 communicates with the outside air through the discharge port 25.

  On the other hand, the dust box 30 is a container that can accommodate chips therein. The dust box 30 according to the present embodiment is formed by combining left and right divided pieces that form an internal space.

  As shown in FIG. 5, the dust box 30 is composed of side wall portions 33e on both the left and right sides and a peripheral wall surrounding the side wall portions 33e. The peripheral wall includes a front upper wall portion 33a, a rear upper wall portion 33b, a rear wall portion 33c, and a lower wall portion 33d.

  The front upper wall portion 33a is a portion that forms a front and upper wall of the dust box 30. The front upper wall portion 33a is formed so as to be gradually inclined upward as it goes rearward.

  The rear upper wall portion 33b is a portion that forms the rear and upper wall of the dust box 30. The rear upper wall portion 33b is formed so as to be gradually inclined downward as it goes rearward. For this reason, the upper surface of the dust box 30 is inclined in a mountain shape by the front upper wall portion 33a and the rear upper wall portion 33b.

  The rear wall portion 33 c is a part that forms a wall behind the dust box 30. A disposal port 34 is formed in the rear wall 33c. The discard port 34 is an opening for discharging chips to the outside when the chips in the dust box 30 are discarded.

  The lower wall portion 33d is a portion that forms the lower wall of the dust box 30. The lower wall portion 33 d comes into contact with the upper surface of the saw cover portion 20 when the dust box 30 is mounted on the housing 15.

  In addition, an exhaust port 36 for allowing air to escape to the outside is formed in the lower wall portion 33d. The exhaust port 36 according to the present embodiment is two openings, a first exhaust port 36a and a second exhaust port 36b. These exhaust ports 36 are connected to the exhaust ports 25 that open to the upper surface of the saw cover portion 20 when the dust box 30 is mounted on the housing 15.

  Further, an opening 35 for introducing chips into the dust box 30 is formed in front of the dust box 30. As shown in FIG. 5, the introduction port 35 is connected to the outlet 21 d of the saw cover portion 20, thereby communicating the guide path 21 of the saw cover portion 20 and the internal space of the dust box 30.

  The lid portion 31 is a member for closing the disposal port 34 of the dust box 30. The lid 31 is detachably formed in the waste port 34 of the dust box 30. When chips accumulate in the dust box 30, the lid 31 can be removed and the chips can be discarded from the disposal port 34.

  Incidentally, the dust box 30 according to the present embodiment includes a partition plate 40 that partitions the inside of the dust box 30 as shown in FIG. By providing this partition plate 40, a one-way chip flow passage 37 is formed from the introduction port 35 to the exhaust port 36. The partition plate 40 according to the present embodiment extends in a direction different from the first partition portion 41 that guides the chips introduced from the introduction port 35 in the outer peripheral direction inside the dust box 30 and the first partition portion 41. And a second partition 42 that guides the chips toward the outer periphery of the dust box 30.

  As shown in FIG. 5, the first partition 41 extends rearward from the introduction port 35 along the inflow direction of the chips. The first partition portion 41 is slightly curved and extends obliquely upward, thereby guiding the chips upward inside the dust box 30 so that the chip passage 37 can be taken longer. ing.

  As shown in FIG. 5, the second partition portion 42 extends rearward so as to be continuous with the first partition portion 41. The front end of the second partition portion 42 faces the rear surface of the first partition portion 41 slightly before the end portion of the first partition portion 41. In addition, the rear end portion of the second partition portion 42 extends slightly diagonally downward, whereby the chips are guided downward in the dust box 30 and the chip flow path 37 can be elongated. I am doing so.

  Thus, by providing the partition plate 40, the chip flow path 37 which concerns on this embodiment becomes one way as shown in FIG.

  By the way, the outflow prevention part 45 for preventing the outflow of the chips from the dust box 30 is provided inside the above-described front upper wall part 33a. The outflow prevention portion 45 is formed so as to protrude from the inner upper surface of the dust box 30. As shown in FIG. 6, the outflow prevention unit 45 in the present embodiment extends along the chip introduction direction D from the inner upper surface of the dust box 30 (the surface on the side far from the saw blade 12, that is, the front upper wall portion 33 a). It is formed to project diagonally. In the present embodiment, a plurality of ribs (projections) are provided as the outflow prevention part 45. That is, the first rib 45a, the second rib 45b, and the third rib 45c are provided. These ribs are provided substantially parallel to each other. In the present embodiment, the portion closer to the introduction port 35 is projected longer, that is, the first rib 45a is the longest, the second rib 45b is the second longest, and the third rib 45c is the shortest. Yes.

  Further, in the dust box 30 according to the present embodiment, since the front upper wall portion 33a extends obliquely upward, the upper portion of the dust box 30 is convex upward. For this reason, the internal space above the dust box 30 (in the direction away from the saw blade 12) is widely secured, and the chip channel 37 is not narrowed even if the outflow prevention portion 45 is provided. Specifically, the minimum cross-sectional area of the chip flow path narrowed by the outflow prevention unit 45 (the cross-sectional area of the S1 portion shown in FIG. 6) is the opening area of the inlet 35 (the section of the S2 portion shown in FIG. 6). It is formed to be larger than (area).

  As described above, according to the present embodiment, since the outflow prevention part 45 is formed so as to protrude from the inner upper surface (front upper wall part 33a) of the dust box 30, the backflow prevention of the chips is prevented by the outflow prevention part 45. be able to. For example, when the introduction port 35 of the dust box 30 is directed downward, even if the chips fall along the inner upper surface of the dust box 30 toward the introduction port 35 of the dust box 30, the outflow prevention unit 45 causes the chips to fall. Can be disturbed. Moreover, since it is not necessary to narrow the chip flow path 37 in order to prevent the backflow of the chips, the chips are not easily clogged. Therefore, the backflow of the chips can be prevented without clogging the chips.

  Moreover, since the outflow prevention part 45 is diagonally formed from the inner upper surface of the dust box 30 along the chip introduction direction D, the flow of the chips is not hindered and the backflow of the chips is effective. Can be prevented.

  Moreover, since the several rib (1st rib 45a, 2nd rib 45b, 3rd rib 45c) is provided as the outflow prevention part 45, the backflow of a chip can be prevented in multiple layers. The plurality of ribs also function to reinforce the dust box 30.

  Further, the minimum cross-sectional area of the chip flow path 37 narrowed by the outflow prevention portion 45 is formed larger than the opening area of the introduction port 35. That is, since the flow of the chips is not hindered by providing the outflow prevention portion 45, the backflow of the chips can be prevented without lowering the dust collecting ability.

  Moreover, the partition plate 40 which opposes the outflow prevention part 45 on both sides of the chip flow path 37 is provided. According to such a configuration, since the introduction port 35 can be covered by the outflow prevention part 45 and the partition plate 40, the backflow of chips can be effectively prevented.

  Moreover, although the outflow prevention part 45 of the present embodiment is a plate-like rib (protrusion part), it may be a shape that receives chips, and may be, for example, a triangular protrusion part that protrudes from the inner surface of the dust box 30.

DESCRIPTION OF SYMBOLS 10 Portable cutting machine 11 Cutting machine main body 12 Saw blade 12a Rotating shaft 15 Housing 16a Motor 16 Motor housing part 17 Grip part 18 Trigger 20 Saw cover part 21 Guide path 21a Upper wall 21b Lower wall 21c Inlet 21d Outlet 21e Side wall 25 Discharge port 30 Dust box 31 Lid 33a Front upper wall portion 33b Rear upper wall portion 33c Rear wall portion 33d Lower wall portion 33e Side wall portion 34 Waste port 35 Inlet port 36 Exhaust port 36a First exhaust port 36b Second exhaust port 37 Chip Flow path 40 Partition plate 41 First partition portion 42 Second partition portion 45 Outflow prevention portion 45a First rib 45b Second rib 45c Third rib 55 Base 55a Opening portion D Chip introduction direction

Claims (6)

A motor,
A saw blade that is rotated by the motor to cut the workpiece;
A dust box disposed above the saw blade in order to collect the chips using the discharge momentum of the chips when the saw blade cuts the workpiece;
With
A portable cutting machine, wherein an outflow prevention portion is formed to protrude on an inner upper surface of the dust box.   2. The portable cutting machine according to claim 1, wherein the outflow prevention part is formed so as to project obliquely from an inner upper surface of the dust box along a chip introduction direction.   The portable cutting machine according to claim 2, wherein a plurality of protrusions are provided as the outflow prevention part. The dust box includes an inlet for introducing chips into the interior,
The portable cutting machine according to claim 3, wherein the plurality of projecting portions are formed so as to project longer toward the introduction port.   The portable device according to any one of claims 1 to 4, wherein a minimum cross-sectional area of a flow path of the chips narrowed by the outflow prevention unit is larger than an opening area of an entrance of the dust box. Cutting machine.   The portable cutting machine according to any one of claims 1 to 5, further comprising a partition plate facing the outflow prevention unit across a flow path of chips.

Images