JP2009000755A - Portable tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive portable tool capable of giving no uncomfortable feeling to a user when a hand gripping a tool body is hit by a protective cover and preventing a cutting object material from being scratched when the cutting object material or the like is hit by the protective cover. <P>SOLUTION: A cutter (portable tool) 1 comprises a driving source built in a cutter body (tool body) 2, a rotary blade 3 rotated/driven by the driving source, a protection cover 4 covering a part of a periphery of the rotary blade 3, and a dust collection cover 12 for sucking and recovering dusts from a suction opening on a part of the periphery of the rotary blade 3. The dust collection cover 12 is formed along a periphery of the protection cover 4 and at least a part of it is composed of elastic material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a portable tool provided with a dust collection cover for collecting dust generated from a workpiece or the like.

  Conventionally, as a portable tool that cuts concrete, tiles, etc. using an electric motor or engine as a drive source, a rotary blade is connected to the rotary shaft of a disc grinder, and the purpose is to prevent dust from being scattered around the rotary blade. A cutter having a protective cover attached 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 protective 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).
JP 2002-046018 A

  In such a conventional cutting operation with a portable tool, there is a case where the front part of the portable tool body close to the rotary blade is gripped in order to strongly press the rotary blade against the material to be cut, etc., but it is attached to the portable tool. Since the protective cover is made of a strong material such as steel, there is a problem that the user feels uncomfortable when the hand holding the front part of the portable tool body is hit against the protective cover. Further, there has been a problem that the material to be cut is damaged by hitting the protective cover against the material to be cut.

  The present invention has been made in view of the above problems, and the purpose of the present invention is not to feel uncomfortable even if the hand holding the tool body is hit against the protective cover, and the protective cover is hit against the material to be cut. Another object of the present invention is to provide an inexpensive portable tool that can prevent damage to the material to be cut.

  In order to achieve the above object, a first aspect of the present invention includes a drive source built in a tool body, a rotary blade that is rotationally driven by the drive source, and a protective cover that covers a part of the outer periphery of the rotary blade. In a portable tool provided with a dust collecting cover that sucks and collects dust from an inlet opening in a part of the outer periphery of the rotary blade, the dust collecting cover is formed along the outer periphery of the protective cover, It is characterized in that at least a part thereof is made of an elastic material.

  According to a second aspect of the present invention, in the first aspect of the present invention, a part of the elastic material is overlapped with a side surface of the protective cover on the tool body side.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein a sub handle is detachably attached to the front end side portion of the tool body, and an elastic material of the dust collecting cover is disposed in the vicinity of the sub handle. It is characterized by that.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein a part of the elastic material of the dust collecting cover is bonded to the side surface of the protective cover on the tool body side with a double-sided tape. It is characterized by.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the dust collecting cover is integrally formed of an elastic material, and a plurality of grooves are formed on the surface thereof.

  According to a sixth aspect of the invention, in the fifth aspect of the invention, the plurality of grooves are formed so as to intersect with each other.

  According to the first aspect of the present invention, since at least a part of the dust collecting cover is made of an elastic material, even if the hand holding the tool body is hit against the protective cover, it does not feel uncomfortable. Even if the protective cover is struck, damage to the material to be cut can be prevented.

  According to the second aspect of the invention, since the elastic material is partially overlapped with the side surface of the protective cover on the tool body side, it is uncomfortable even if the operator hits the protective cover with the hand during the cutting operation with the portable tool. Even if the dust cover is hit against the material to be cut, the material to be cut can be prevented from being damaged.

  According to the invention described in claim 3, since the elastic material of the dust collection cover is disposed in the vicinity of the sub handle attached to the front end side portion of the tool body, the operator's hand holding the sub handle hits the protective cover. However, the worker does not feel uncomfortable.

  According to the invention described in claim 4, since a part of the elastic material for the dust collecting cover is bonded to the side surface of the protective cover on the tool body side with the double-sided tape, the portion of the dust collecting cover is removed from the side surface of the protective cover during the cutting operation. It doesn't get in the way of work.

  According to the fifth aspect of the present invention, since the plurality of grooves are formed on the surface of the dust collection cover molded by the elastic material, the contact area of the dust collection cover to the material to be cut becomes small, and the material to be cut can be obtained. Scratch can be suppressed. In addition, the dust collection cover can be reduced in thickness and reduced in weight, the operability of the portable tool can be improved, and the molding material for the dust collection cover can be reduced, thereby realizing low cost. Can do.

  According to the invention of claim 6, since the plurality of grooves are formed on the surface of the dust collection cover molded with an elastic material, the contact area of the dust collection cover to the material to be cut becomes smaller, Damage to the material to be cut can be suppressed. In addition, the dust collection cover can be further reduced in thickness and reduced in weight, improving the operability of the portable tool and further reducing the molding material for the dust collection cover, thereby further reducing the cost. Can be realized.

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

  1 is a perspective view of a cutter as an embodiment of a portable tool according to the present invention, FIG. 2 is a right side view of the cutter, FIG. 3 is a front sectional view of the cutter, and FIG. 4 is a line AA in FIG. FIG. 5 is a sectional view taken along the line BB in FIG. 2, FIG. 6 is a side sectional view showing the cutting operation (when the cutting depth is deep) of the cutter, and FIG. 7 is the cutting operation (cutting depth) of the cutter. 8 is a side view showing the cutting operation of the cutter (when the cutting depth is shallow), and FIG. 9 is a side view showing the cutting operation of the cutter (when the cutting depth is deep). 10 is a cross-sectional view taken along the line CC of FIG.

  As shown in FIGS. 1 to 6, the cutter 1 according to the present embodiment is configured by rotatably supporting a disk-shaped rotary blade 3 at the tip of the cutter body 2. The upper half of the outer periphery and both end faces are covered with an arc-shaped protective cover 4.

  The protective cover 4 has a first protective cover 4A that covers the outer periphery of the rotary blade 3 and the side end surface of the cutter body 2, and a second protective cover 4B that covers the outer periphery of the first protective cover 4A and the outer end surface of the rotary blade 3. And the second protective cover 4B and a third protective cover 4C that covers the outer end face of the rotary blade 3. Here, the first protective cover 4A is integrally formed of a hard material such as aluminum, and the second protective cover 4B and the third protective cover 4C are integrally formed of a resin such as polycarbonate.

  Here, the cutter body 2 has a built-in electric motor (not shown) as a drive source, and the rotary blade 3 is attached to the end of a drive shaft 5 (see FIG. 3) that is rotationally driven by the electric motor. Yes. 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.

  Furthermore, the front end portion of the cutter body 2 is provided with a sub handle 17 having a substantially rectangular shape when viewed from the front, and the operator can stably hold the cutter 1 by simultaneously holding the handle portion 2a and the sub handle 17 during the cutting operation. The rotary blade 3 can be strongly pressed against the material to be cut W.

  A metal base 8 is provided at the front end lower portion of the cutter body 2 so as to be rotatable about a shaft 9 at the front end. This base 8 is for adjusting the cutting depth of the rotary blade 3 and performing the cutting operation stably. The base 8 is respectively provided at the front end and the rear end so that it can move smoothly on the workpiece W. A pair of rollers 22 is attached. The base 8 is connected to the other end (lower end) of a pair of left and right metal connecting members 10 whose one ends (upper end) are fixed to the protective cover 4 so as to be rotatable by the shaft 9. . A front guide 8A is rotatably connected to the front end portion of the base 8 by the shaft 9. In the front guide 8A, a convex portion 8a provided at the front end is pushed up by a spring 18 attached on the front end portion of the base 8, and a rear end protrudes downward from the opening 8c of the base 8 to the base 8. .

  Further, on the rear end portion of the base 8, a channel-shaped rear guide 8B that sandwiches the rotary blade 3 from both sides together with the front guide 8A is erected, and an arc-shaped guide is provided on the side of the rear guide 8B. A groove 8b is formed. The third protective cover 4C is attached to the front end of the guide groove 8b so that the lower end is in contact with the base 8.

  Therefore, as shown in FIGS. 6 to 9, in a state where the base 8 is placed on the workpiece W, 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 8b formed in the rear guide 8B of the base 8. Further, the front guide 8A is rotated about the shaft 9 because the rear end thereof is pushed up by the workpiece W.

  Incidentally, a dust collecting cover 12 formed in an arc shape in a side view along the outer periphery of the protective cover 4 is attached to the outside of the protective cover 4. The dust collecting cover 12 is integrally formed into a rectangular tube by a flexible elastic material such as rubber, soft urethane resin, thermoplastic resin, etc. (see FIG. 3), and dust inside the dust collecting cover 12 is independent from the protective cover 4. A flow path 13 is formed (see FIG. 6).

  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). One end of a resin adapter 14 is attached to the outlet 12b by a metal band 19. Further, the other end of the adapter 14 is inserted and connected to a hose port 16 attached to one end of the hose 15. The other end of the hose 14 is connected to a dust collector (not shown).

  As shown in FIG. 4, both side portions of the upper portion of the suction port 12 a formed in the dust collecting cover 12 are fixed to the upper end of the connecting member 10 by knob bolts 21. On the other hand, as shown in FIG. 6, both side portions of the discharge port 12 b formed in the dust collection cover 12 are fixed to the second protective cover 4 </ b> B together with the band 19 by screws 20.

  Further, a thin plate-like extension 12c is formed on the side end of the cutter body 2 of the dust collecting cover 12 downward, and this extension 12c overlaps with the vicinity of the outer periphery of the side surface of the first protective cover 4A. Yes. Here, if the back surface of the extension portion 12c is fixed on the side surface of the first protective cover 4a with a double-sided tape or the like, the extension portion 12c may be lifted from the side surface of the first protective cover 4a at the time of cutting work, which may hinder the work. Not safe and more desirable.

  Further, a plurality of grooves 12d having a depth of about 0.5 mm are formed on the entire surface of the dust collecting cover 12 so as to intersect with each other in the front-rear direction, the left-right direction, and the up-down direction. Further, as shown in FIG. 2, a plurality of grooves 4a are formed on the side surface of the second protective cover 4B so as to continue from the plurality of grooves 12d of the dust collecting cover 12.

Next, the cutting operation | work of the to-be-cut material W using the cutter 1 which has the above structure is demonstrated. Note that the cutting work includes grooving. When the workpiece W is cut using the cutter 1 according to the present embodiment, as shown in FIGS. The base 8 is placed, the cutter 1 is set on the workpiece W, the handle 2a of the cutter body 2 and the sub handle 17 are simultaneously grasped, and the switch 6 is turned on. Then, an electric motor (not shown) built in the cutter body 2 is activated, the rotation is transmitted to the drive shaft 5, and the rotary blade 3 attached to the drive shaft 5 moves in the direction of arrow a (counterclockwise direction) in FIG. ). In this state, when the cutter body 2 is moved in the cutting direction (the direction of the arrow b in FIGS. 7 to 9), the material W to be cut is sequentially cut by the rotary blade 3 (in this embodiment, the workpiece to be cut). The material W is grooved).

  In the state shown in FIG. 7, the cutting depth (groove depth) of the workpiece W 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 as shown in FIG. 8 (<H1). Adjusted to At this time, the first protective cover 4A and the second protective cover 4B are rotated upwardly about the shaft 9 together with the rotary blade 3 and the like. However, since the third protective cover 4C is fixed to the base 8, the base 8 The outer end face of the rotary blade 3 above is kept covered by the second protective cover 4B and the third protective cover 4C, and high dust collection efficiency is ensured.

  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). 6 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 outlet 12b in the direction of the arrow d in FIG. 6, and the adapter 14 and the hose 15 are discharged from the outlet 12b. Then, the dust is sucked and collected by a dust collector (not shown), and the dust is prevented from being scattered around and the working environment is improved.

  Further, as shown in FIGS. 9 and 10, there is a case where a portion of the sub handle 17 near the rotary blade 3 is gripped in order to press the rotary blade 3 more strongly against the workpiece W, but the first made of a hard material is sometimes used. Since the extended portion 12c of the dust collecting cover 12 overlaps with the vicinity of the outer periphery of the side surface of the protective cover 4A, the operator's finger X holding the sub handle 16 does not hit the first protective cover 4A during the cutting operation.

  As described above, in the present embodiment, the entire dust collection cover 12 is made of a flexible elastic material such as rubber, and the extended portion 12c of the dust collection cover 12 is near the outer periphery of the side surface of the first protective cover 4A made of a hard material. Therefore, the operator's finger X holding the sub handle 17 during the cutting operation by the cutter 1 does not directly hit the first protective cover 4A, and the operator does not feel uncomfortable.

  Further, even if the dust collection cover 12 hits the material to be cut W or the like when the cutter 1 is transported, the material to be cut W is not damaged only by elastic deformation of the dust collection 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 configured compactly.

  Further, since the plurality of grooves 12d are formed on the entire surface of the dust collection cover 12 so as to intersect the front-rear direction, the left-right direction, and the vertical direction, the contact area of the dust collection cover 12 with the material W to be cut is reduced. Damage to the material W to be cut due to the contact of the dust cover 12 is prevented. And since the groove | channel 12d was formed in the surface of the dust collection cover 12, the dust collection cover 12 can be reduced in thickness and reduced in weight, the operability of the cutter 1 can be improved, and the dust collection cover 12 is molded. Flexible rubber or soft urethane resin, which is a material, can be reduced, and the dust collecting cover 12 can be configured at low cost.

  Further, in the present embodiment, the dust collecting cover 12 is formed into a rectangular tubular shape with an elastic material, and the dust passage 13 independent of the protective cover 4 is formed therein, so that the surface of the dust passage 13 has a step. As a result, the dust sucked into the dust collecting cover 12 flows smoothly without any resistance in the dust flow path 13 and is collected, thereby ensuring high dust collection efficiency. Even if 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 13 during the cutting operation. .

  Although the present invention has been described with respect to a mode in which the present invention is applied to a cutter, the present invention is similarly applied to any other portable tool such as a hammer drill, circular saw, disc grinder, and the like. Of course, the effect can be obtained.

It is a perspective view of the cutter concerning the present invention. It is a right view of the cutter which concerns on this invention. It is a front sectional view showing a cutter according to the present invention. It is the sectional view on the AA line of FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is a sectional side view which shows the cutting operation (when the cutting depth is deep) by the cutter which concerns on this invention. It is a side view which shows the cutting operation (when cutting depth is deep) by the cutter which concerns on this invention. It is a side view which shows the cutting | disconnection work (when cutting depth is shallow) by the cutter which concerns on this invention. It is a side view which shows the cutting operation (when cutting depth is deep) by the cutter which concerns on this invention. It is CC sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutter 2 Cutter body 2a Handle 3 Rotary blade 4 Protective cover 4A 1st protective cover 4B 2nd protective cover 4C 3rd protective cover 4a Groove of 2nd protective cover 5 Drive shaft 6 Switch 7 Power cord 8 Base 8A Front guide 8B Rear guide 8a Convex 8b Guide groove 8c Opening 9 Shaft 10 Connecting member 11 Adjuster 12 Dust collection cover 12a Dust collection cover suction port 12b Dust collection cover discharge port 12c Dust collection cover extension 12d Dust collection cover groove 13 Dust channel 14 Adapter 15 Hose 16 Hose port 17 Sub handle 18 Spring 19 Band 20 Screw 21 Knob bolt 22 Roller W Material to be cut X Finger of operator

Claims (6)

From a drive source built in the tool body, a rotary blade that is rotationally driven by the drive source, a protective cover that covers a part of the outer periphery of the rotary blade, and a suction port that opens to a part of the outer periphery of the rotary blade In portable tools with a dust collection cover that sucks and collects dust,
The dust collecting cover is formed along the outer periphery of the protective cover, and at least a part thereof is made of an elastic material.   The portable tool according to claim 1, wherein a part of the elastic material is overlapped on a side surface of the protective cover on the tool body side.   The portable tool according to claim 1 or 2, wherein a sub handle is detachably attached to a front end side portion of the tool body, and an elastic material of the dust collecting cover is disposed in the vicinity of the sub handle.   The portable tool according to any one of claims 1 to 3, wherein a part of the elastic material of the dust collecting cover is bonded to a side surface of the protective cover on the tool body side with a double-sided tape.   The portable tool according to any one of claims 1 to 4, wherein the dust collecting cover is integrally formed of an elastic material, and a plurality of grooves are formed on a surface thereof. The portable tool according to claim 5, wherein the plurality of grooves are formed so as to intersect with each other.

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