JP4957228B2 - cutter - Google Patents

Description

  The present invention relates to a cutter provided with a dust collection cover for collecting dust generated when cutting concrete, tiles or the like.

  Conventionally, as a cutter for cutting concrete, tiles, etc. using an electric motor or engine as a drive source, a rotary blade is coupled to the rotating shaft of a disc grinder, and the purpose is to prevent dust from being scattered on the outer periphery of the rotary blade. A structure with a safety cover is generally used. Dust generated when performing a cutting operation using such a cutter is scattered to the surroundings, and even if it is slightly cut, the field of view, particularly in the indoor work site, is poor. For this reason, the worker cannot work without wearing a dust mask or protective glasses, and the environment for the work site and the worker is poor.

  Therefore, in order to improve the above situation, a dust collecting hose is attached to a part of the safety cover of the cutter, this dust collecting hose is connected to an external electric dust collector, etc., and the dust generated during cutting is sucked by the electric dust collector, etc. Thus, a cutter has been proposed (see, for example, Patent Document 1). Such a cutter is shown in FIG.

  That is, FIG. 10 is a side view showing a cutting state of a cutter provided with a dust collecting device that sucks up dust with an electric dust collector or the like, and a dust collecting cover 112 is attached to the cutter 101 as shown in FIG. A rotary blade 103 is rotatably housed inside the cover body of the dust collecting cover 112, and the rotary blade 103 cuts the workpiece W while rotating in the direction of the arrow shown (clockwise).

  The dust collection cover 112 is accompanied by a suction cylinder 116, and this suction cylinder 116 is connected to an electric dust collector (not shown) via a dust collection hose 114. Note that a dust collection bag (not shown) for collecting dust discharged from the suction cylinder 116 can be detachably attached to the suction cylinder 116.

Thus, when the material to be cut W is cut by the cutter 101, the dust collecting cover 112 and the cutter 101 move in the cutting direction (left direction in FIG. 10), and the dust generated by the cutting of the material to be cut W is collected. The dust dust is ejected toward the suction cylinder 116 in the dust cover 112, and the ejected dust is sucked by the electric dust collector and efficiently collected to the electric dust collector through the dust collecting hose 114, and scattering to the surroundings is prevented. Can be removed.
JP 2002-046018 A

  However, since the dust collection cover 112 attached to the conventional cutter 101 shown in FIG. 10 is made of a strong material such as a steel material, the dust collection cover 112 is cut into the material W to be cut when the cutter 101 is transported. There has been a problem that the material to be cut W is scratched by hitting it. Further, in the conventional dust collecting mechanism as shown in FIG. 10, there is a problem that part of the dust leaks out of the dust collecting cover 112.

  The present invention has been made in view of the above problems, and the purpose of the process is to prevent damage to the material to be cut even if the dust collection cover is hit against the material to be cut, etc. It is in providing the cutter which can aim at improvement.

In order to achieve the above object, an invention according to claim 1 is a base, a cutter body connected to the base so as to be rotatable in the vertical direction, a drive source for driving a rotary blade, and the rotation A cutter comprising: a protective cover that covers the blade; and a dust body cover that has a suction port formed at a lower end of a suction port that opens toward a part of the outer periphery of the rotary blade. Alternatively, it is made of TPE (thermoplastic elastomer) and the cutter main body is rotated upward with respect to the base, and the guide portion extending upward from the base has both sides of the rotary blade inside the suction port. It is characterized by being configured to be sandwiched between .

According to a second aspect of the invention, in the invention according to the first aspect, the end portion of the suction plug mouth extending to the inner diameter side than the outer peripheral portion of the rotary blade, a cutout in which the rotary blade passes in a part thereof It is formed.

The invention according to claim 3 is the invention according to claim 1 or 2 , wherein the dust collecting cover is formed into a tubular shape with rubber or TPE (thermoplastic elastomer), and the protective cover is formed inside the dust collecting cover. An independent dust channel is formed.

Invention of claim 4, in the invention according to any one of claims 1-3, styrene elastomer as TPE (thermoplastic elastomer) constituting at least a part of the dust collecting cover (SBC), olefin-based elastomer (TPO), urethane elastomer (TPU), vinyl chloride elastomer (TPVC), polyester elastomer (TPEE), polyamide elastomer (TPAE), or fluorine elastomer is used.

ADVANTAGE OF THE INVENTION According to this invention, even if it hits a dust collection cover on a to-be-cut material, while being able to prevent a damage to a to-be-cut material, the cutter which aimed at the improvement of dust collection efficiency can be provided.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

<Embodiment 1>
1 and 2 are side views showing a cutting operation by the cutter according to Embodiment 1 of the present invention, FIG. 3 is a side sectional view of the cutter, FIG. 4 is a sectional view taken along line AA in FIG. 2, and FIG. 3 is a cross-sectional view taken along line BB in FIG. 3, FIG. 6 is a cross-sectional view taken along line CC in FIG. 3, and FIG. 7 is a cross-sectional view taken along line DD in FIG.

  As shown in FIGS. 1 to 3, the cutter 1 according to the present embodiment is configured by rotatably supporting a disc-shaped rotary blade 3 at the tip of the cutter body 2. The upper half of the outer periphery and one side (the back side in FIGS. 1 to 3) end surfaces are covered with an arc-shaped protective cover 4 integrally formed of a hard material such as aluminum. Here, the cutter body 2 has a built-in electric motor (not shown) as a drive source, and is attached to the end of the drive shaft 5 that is rotationally driven by the electric motor. A handle 2a is formed at the rear end of the cutter body 2, and a switch 6 for turning on / off the driving of the electric motor is provided on the handle 2a. A power cord 7 for supplying power to the electric motor extends from the handle portion 2a.

  A metal base 8 is provided at the lower front end of the cutter body 2 so as to be rotatable about a shaft 9 at the front end. The base 8 is for adjusting the cutting depth of the rotary blade 33 and for stably performing the cutting operation. The base 8 is made of a pair of left and right metals having one end (upper end) fixed to the protective cover 4. A front end portion of the connecting member 10 is rotatably connected to the other end (lower end) of the connecting member 10 by the shaft 9. On the front end portion and the rear end portion of the base 8, channel-shaped guide portions 8A and 8B for sandwiching the rotary blade 3 from both sides are erected, and on the side portion of one guide portion 8B. An arcuate guide groove 8a is formed.

  Accordingly, in the state where the base 8 is placed on the workpiece W as shown in FIGS. 1 to 3, the cutter body 2 can be rotated up and down around the shaft 9 together with the rotary blade 3 and the like. The position is fixed by tightening the adjuster 11 inserted through the guide groove 8a formed in the guide portion 8B of the base 8.

  By the way, on the outside of the protective cover 4, 12 dust collecting covers formed in an arc shape in a side view along the outer periphery of the protective cover 4 are attached. The dust collecting cover 12 is integrally formed into a rectangular tubular shape by a flexible elastic material such as rubber, soft urethane resin, thermoplastic resin, etc. (see FIG. 6), and dust inside the dust collecting cover 12 is independent from the protective cover 12. A flow path 13 is formed (see FIG. 3). Examples of the flexible elastic material include styrene elastomer (SBC), olefin elastomer (TPO), urethane elastomer (TPU), vinyl chloride elastomer (TPVC), polyester elastomer (TPEE), polyamide elastomer (TPAE), There may also be mentioned thermoplastic resins (TPE) such as fluorine-based elastomers.

  A suction port 12a that opens toward a part of the outer periphery of the rotary blade 3 is formed at one end (lower end) of the dust collecting cover 12, and a discharge port 12b is opened at the other end (upper end). A hose port 15 attached to one end of the hose 14 is inserted into and connected to the outlet 12. The other end of the hose 14 is connected to a dust collector (not shown).

  Here, since the dust collection cover 12 is entirely made of a flexible elastic material such as rubber as described above, the hose 14 is connected to the end of the hose opening 15 attached to the end of the dust collection cover 12. It is securely connected to the dust collecting cover 12 just by being inserted into the outlet 12b. For this reason, even if the cutter body 2 is moved, the hose port 15 is held tightly around the discharge port 12b of the dust collecting cover 12 to prevent the hose 14 from falling off the dust collecting cover 12, and the dust collecting cover 12 Dust leakage from the gap between the discharge port 12b and the hose port 15 is reliably prevented.

  As shown in FIGS. 3 and 5, the end of the suction port 12a portion of the dust collecting cover 12 extends from the outer peripheral portion of the rotary blade 3 to the inner diameter side by the length x shown in the drawing, and its width direction In the center, a notch 12c through which the rotary blade 3 passes is partially formed. As shown in FIGS. 3 and 6, a part of the guide portion 8 </ b> A erected on the base 8 faces inside the suction port 12 a of the dust collection cover 12. As shown in FIG. 4, both side portions of the suction port 12 a are sandwiched between the guide portion 8 </ b> A and the connecting member 110 arranged inside and outside them.

  Next, the cutting operation | work of the to-be-cut material W using the cutter 1 which has the above structure is demonstrated. The cutting operation includes grooving.

  When cutting the workpiece W using the cutter 1 according to the present embodiment, as shown in FIGS. 1 to 3, the base 8 is placed on the workpiece W and the cutter 1 is cut. It is set on the material W, the handle portion 2a of the cutter body 2 is gripped, and the switch 6 is turned on. Then, an electric motor (not shown) built in the cutter body 2 is activated, and the rotation is transmitted to the drive shaft 5, and the rotary blade 3 attached to the drive shaft 5 moves in the direction indicated by the arrow a (counterclockwise). Is driven to rotate. In this state, when the cutter body 2 is moved in the cutting direction (in the direction of the arrow b in the figure), the material to be cut W is sequentially cut by the rotary blade 3 (in the present embodiment, the material to be cut W has a groove). Cutting).

  In the state shown in FIG. 1, the cutting depth (groove depth) of the material W to be cut is relatively deep as h1, but the adjuster 11 is loosened and the cutter body 2 is rotated upward about the shaft 9 together with the rotary blade 3 and the like. When the position of the cutter body 2 is fixed by tightening the adjuster 11 after the movement, the cutting depth (groove depth) of the workpiece W is shallower than h1 h2 (<h1) as shown in FIG. Adjusted to

  Thus, when the workpiece W is cut (grooved) by the rotary blade 3 as described above, dust is generated. This dust is generated by the rotation of the rotary blade 3 and the suction force by a dust collector (not shown). While being guided by the guide portion 8A of the base 8, it is sucked into the dust channel 13 from the suction port 12a of the dust collecting cover 12 as indicated by an arrow c in FIG. Then, the dust sucked into the dust channel 13 in the dust cover 12 flows in the dust channel 13 toward the discharge port 12b in the direction of the arrow d in FIG. 3 and passes through the hose 14 from the discharge port 12b. The dust is sucked and collected by the dust collector shown in the figure, and the dust is prevented from being scattered around and the working environment is improved.

  As described above, in the present embodiment, since the entire dust collection cover 12 is configured by a flexible elastic body such as rubber, even when the dust collection cover 12 hits the workpiece W or the like when the cutter 1 is conveyed, The material to be cut W or the like is not damaged only by the elastic deformation of the dust collecting cover 12. In particular, since the dust collection cover 12 is formed along the outer periphery of the protective cover 4, the entire cutter 1 can be made compact, and the contact area of the dust collection cover 12 to the material W to be cut is reduced, thereby collecting the dust. Damage to the material W to be cut due to the contact of the cover 12 is suppressed.

  In the present embodiment, since the end of the suction port 12a portion of the dust collecting cover 12 is extended to the inner diameter side of the outer peripheral portion of the rotary blade 3, dust generated by cutting the material W to be cut by the rotary blade 3 Even if the rotary blade 3 rotates around the inner diameter side of the protective cover 12 by the rotation of the rotary blade 3, it is blocked by the end of the suction port 12 a portion of the dust collection cover 12, and the dust flows into the suction port 12 a of the dust collection cover 12. It is efficiently sucked and collected, thereby ensuring a high dust collection efficiency. Even when the end of the suction port 12a portion of the dust collecting cover 12 is extended to the inner diameter side of the outer peripheral portion of the rotary blade 3 in this way, the interference with the rotary blade 3 is caused by the notch 12c formed in the portion. Is prevented. Further, since the entire dust collection cover 12 is made of an elastic material, the suction port 12a portion of the dust collection cover 12 is easily deformed when the rotary blade 3 is replaced, and the replacement of the rotary blade 3 is not hindered. .

  Further, in the present embodiment, both side portions of the suction port 12a portion of the dust collection cover 12 are sandwiched between the guide portion 8A of the metal base 8 disposed inside and outside of the dust collection cover 12 and the connecting member 10, so that the deformation thereof is reduced. Even if the suction port 12a portion of the dust collecting cover 12 is brought close to the rotary blade 3 in order to prevent dust collection efficiency and prevent the interference with the rotary blade 3 of the suction port 12a portion, the cutting work is reliably prevented. Can be performed stably.

  Further, in the present embodiment, the dust collection cover 12 is formed into a rectangular tubular shape with an elastic material, and the dust flow path 13 independent of the protective cover 4 is formed therein, so that the surface of the dust flow path 13 has a step or the like. As a result, the dust sucked into the dust collecting cover 12 flows smoothly through the dust passage 13 without resistance and is collected, thereby ensuring high dust collection efficiency. Even when the dust collecting cover 12 is forcibly deformed, the internal dust passage 13 is not connected to the outside, and dust does not leak out of the dust passage 113 during cutting.

  In addition, in this Embodiment, since the flexible rubber or soft urethane resin was used as an elastic material which comprises the dust collection cover 12, the dust collection cover 12 can be comprised cheaply.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 8 is a side view showing the cutting operation by the cutter according to Embodiment 2 of the present invention, and FIG. 9 is a cross-sectional view taken along the line EE of FIG. 8. In these figures, those shown in FIGS. The same elements are denoted by the same reference numerals, and description thereof will be omitted below.

  In the present embodiment, the end portion of the protective cover 4 is integrally extended toward the suction port of the dust collection cover 12 to form a protruding piece 4a, and dust is guided to the suction port 12a of the dust collection cover 12 by the protruding piece 4a. In addition, as shown in FIG. 9, the projecting piece 4a and the connecting member 10 sandwich both sides of the suction port 12a of the dust collecting cover 12 from both sides, and the other configuration is the first embodiment. It is the same.

  Thus, also in the present embodiment, since both side portions of the suction port 12a portion of the dust collecting cover 12 are sandwiched between the projecting pieces 4a of the protective case 4 disposed inside and outside thereof and the connecting member 10, the deformation Even if the suction port 12a portion of the dust collection cover 12 is brought close to the rotary blade 3 in order to increase dust collection efficiency, interference with the rotary blade 3 of the suction port 12a portion is reliably prevented and cut. In addition to being able to perform work stably, the same effects as those of the first embodiment can be obtained.

  In the above embodiment, the entire dust collection cover is made of an elastic material such as rubber. However, if the dust collection cover has at least a part including the outer peripheral portion and the suction port portion, the dust collection cover is made of the elastic body. The same effect can be obtained.

It is a side view which shows the cutting operation (when cutting depth is deep) by the cutter which concerns on Embodiment 1 of this invention. It is a side view which shows the cutting operation (when cutting depth is shallow) by the cutter which concerns on Embodiment 1 of this invention. It is a sectional side view which shows the cutting operation (when cutting depth is deep) by the cutter which concerns on Embodiment 1 of this invention. It is the sectional view on the AA line of FIG. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is a side view which shows the cutting operation by the cutter which concerns on Embodiment 2 of this invention. It is the EE sectional view taken on the line of FIG. It is a side view which shows the cutting operation by the conventional cutter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutter 2 Cutter body 2a Handle part of cutter body 3 Rotating blade 4 Protective cover 4a Projection piece of protective cover (existing rigid member)
5 Drive shaft 6 Switch 7 Power cord 8 Base 8A, 8B Base guide (existing rigid member)
8a base guide groove 9 shaft 10 connecting member (existing rigid member)
11 Adjuster 12 Dust Collection Cover 12a Dust Collection Cover Suction Port 12b Dust Collection Cover Discharge Port 12c Dust Collection Cover Notch 13 Dust Channel 14 Hose 15 Hose Port W Material to be Cut

Claims (4)

Base and
A cutter body connected to the base so as to be rotatable in the vertical direction, toward a drive source that drives the rotary blade, a protective cover that covers the rotary blade, and a part of the outer periphery of the rotary blade A cutter body having a dust collection cover with a suction opening formed at the lower end;
In the cutter with
The dust collection cover is made of rubber or TPE (thermoplastic elastomer), and a guide portion extending upward from the base is located inside the suction port while the cutter body is rotated upward with respect to the base. The cutter is configured to sandwich the rotary blade from both sides . The cutter according to claim 1, wherein an end of the suction port is extended to an inner diameter side from an outer peripheral portion of the rotary blade, and a notch through which the rotary blade passes is formed in a part thereof . The cutter according to claim 1 or 2 , wherein the dust collection cover is formed in a tubular shape, and a dust flow path independent of the protective cover is formed therein. TPE constituting at least a part of the dust collecting cover (thermoplastic elastomer) as a styrene elastomer (SBC), olefin-based elastomer (TPO), urethane-based elastomers (TPU), vinyl chloride elastomers (TPVC), polyester-based elastomer ( The cutter according to any one of claims 1 to 3 , wherein any one of TPEE), polyamide elastomer (TPAE), and fluorine elastomer is used.

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