JP2013059843A - Dust collection bag, dust collection adaptor provided with the same, and power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of dust collection while miniaturizing a dust collection bag.SOLUTION: A dust collection adaptor having a dust collection cover and a dust collection bag 40 mounted thereto is mounted on a power tool such as a grinding machine. The dust collection bag 40 includes an outer bag 41 having a slit 48 and an inner filtering part 42 folded in a dust collection chamber 46 in the outer bag, and an air discharge chamber 51 for causing the slit 48 to discharge air flowing in the inner filtering part 42 is formed in the inner filtering part 42. A spacer 52 is arranged in the air discharge chamber 51, for preventing the air discharge chamber 51 from being collapsed. A dust air flow flowing in the dust collection chamber 46 is filtered by the outer bag 41, is filtered by the inner filtering part 42, and is discharged to the outside.

Description

  The present invention relates to a dust collection bag used for power tools such as a grinding machine and a cutting machine, a dust collection adapter including the dust collection bag, and a power tool.

  There are a grinding machine and a cutting machine as a power tool for processing a workpiece by rotationally driving a tip tool with a power source. A grinding machine is a power tool that grinds a workpiece using a grindstone as a tip tool, and is also called a disc grinder or a disc sander. The cutting machine is a power tool that cuts a workpiece using a disc-shaped saw blade as a tip tool, and is also called a circular saw.

  For example, in a disk grinder for cutting or grinding a concrete material or a hard ceramic material, a workpiece is cut or ground using a cutting tool such as a diamond cutter or a diamond cup wheel as a tip tool. Since a large amount of dust is generated during cutting and grinding operations, a dust collecting cover for preventing dust diffusion may be attached to the disc grinder in order to prevent dust from scattering. Since the dust collection cover can be attached to the disc grinder so as to cover the cutting tool, as described in Patent Document 1, in order to guide the dust accumulated inside the dust collection cover to the outside, a fan casing or a dust collection cover is used. The dust cover is provided with a hose and a duct. When the dust is guided to the dust collector via the hose or the duct, the dust can be collected by the dust collector.

  If a cloth dust bag is attached to the outlet of the dust cover provided on the power tool without connecting the power tool to the dust collector with a hose, etc., there is no need to attach a long hose to the dust cover. Workability such as polishing using a tool can be improved.

  For example, in the power tool described in Patent Document 2, dust generated when a workpiece is cut using a disc-shaped saw blade as a tip tool is collected in a dust bag. Moreover, patent document 3 is disclosing the tabletop cutting machine with which the dust bag was mounted | worn in order to accommodate the chips generated in the case of a cutting | disconnection. Such dust bags and dust bags are made of cloth and can be used repeatedly.

JP 2001-138203 A Japanese Patent No. 3633370 Japanese Utility Model Publication No. 62-134618

  As described in Patent Documents 2 and 3, when a dust bag is attached to a power tool such as a grinding machine or a cutting machine, a long hose is used to supply dust to the dust collector at a position away from the power tool. There is no need to use it, and workability such as grinding work can be improved. However, since the dust collection bag is ground and cut while attached to the discharge port of the dust collection cover, the size of the dust collection bag is naturally limited.

  In addition, a fan is provided on the rotating shaft for rotationally driving the grindstone and cutting blade of the power tool, and dust is collected in the dust collection bag using the inertial force due to the rotation of the tip tool such as the grindstone and the suction force of the fan. In order to improve the dust collection efficiency and collect more dust in the power tool in the form, the pressure loss in the flow path from the discharge port of the dust collection cover to the dust collection bag is reduced. It is necessary to ensure that the dust is collected in the dust collection bag smoothly. The dust bag is made of breathable cloth and has a filter function. To reduce pressure loss, increase the surface area of the dust bag so that as much airflow as possible passes through the dust bag. It is effective to do so.

  However, as described above, since the dust collection bag is used in a state of being attached to the discharge port of the dust collection cover, if the size of the dust collection bag is excessively large, the operability of grinding and cutting work is impaired. There is a problem.

  An object of the present invention is to improve dust collection efficiency while downsizing a dust collection bag.

  The dust collection bag of the present invention is a dust collection bag that is attached to a discharge port and collects dust generated when a workpiece is processed, and is provided with a connection port that is attached to the discharge port, and the inside An outer bag body made of cloth that forms a dust collection chamber communicating with the connection port, an inner filter section having two surfaces facing each other inside the outer bag body, and a spacer that holds an interval between the inner filter sections. It is characterized by that.

  The dust collection bag of the present invention is characterized in that the spacer has higher air permeability than the inner filtration part. The dust collection bag of the present invention is characterized in that the end of the inner filtration part is formed with a plurality of closed parts closed by fasteners. The dust collection bag of the present invention is characterized in that the outer bag body has a plurality of inner filtration portions adjacent to each other. The dust collection bag of the present invention is characterized in that the outer bag body has a plurality of inner filtration portions positioned on opposite sides of each other.

  The dust collecting adapter of the present invention is a dust collecting adapter that is attached to a power tool that rotates a tip tool to process a workpiece, and sucks and collects dust generated when processing the workpiece, The power tool is detachably mounted so as to cover the tip tool, and has a dust collection cover for sucking dust and the dust collection bag. The dust collection adapter according to the present invention includes a dust collection fan driven by a rotating shaft that rotationally drives a power tool.

  A power tool according to the present invention includes the dust collection bag or the dust collection adapter.

  According to the present invention, the dust collection bag has an outer bag body and an inner filtration portion provided therein, and when the dust air flow flows in from the connection port, the dust bag is filtered by the outer bag body and from the outer bag body. While the cleaned air is discharged, the air filtered by the inner filtration unit and cleaned from the inner filtration unit is discharged to the outside. As a result, the filtration area of the dust collection bag can be increased without increasing the size of the dust collection bag, so that the dust collection efficiency can be improved without impairing the operability of the power tool such as a grinding machine or a cutting machine. Can be increased.

  By attaching a dust collecting adapter having a dust collecting bag and a dust collecting cover to which the power tool is attached to the power tool, the power tool can be made a dust collecting type, and without impairing the operability of the power tool, Dust collection efficiency can be increased.

It is sectional drawing which shows the grinding machine which is an example of a power tool. FIG. 2 is a perspective view of the dust collection bag shown in FIG. 1. FIG. 3 is a front view of FIG. 2. FIG. 4 is a plan view of FIG. 3. It is a cross-sectional view which follows the AA line in FIG. (A) is an expanded view of the dust collection bag shown by FIG. 2, (B) is sectional drawing which follows the BB line in (A). It is a transverse cross section of a dust collection bag in the state where dust was collected. It is a top view of a dust collection bag in the state where dust was collected. It is a cross-sectional view which shows the dust collection bag which is other embodiment. It is a cross-sectional view which shows the dust collection bag which is further another embodiment. It is a front view of the dust collection bag which is a comparative example. It is a cross-sectional view of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The power tool shown in FIG. 1 is a portable or hand-held grinding machine 10, and this grinding machine 10 is used for grinding the surface of a workpiece such as concrete or stone, for example. Also called disc sander.

  This grinding machine 10 has a cylindrical motor case 11a and a gear case 11b attached to the tip of the motor case 11a. An electric motor 12 is accommodated in the motor case 11a as a power source. The electric motor 12 is connected to a commercial power source via a power cord (not shown) drawn from the rear end of the motor case 11a, and is driven by electric power supplied from the commercial power source. A bevel gear 14 is attached to the rotating shaft 13 of the electric motor 12, and a bevel gear 15 that meshes with the bevel gear 14 is attached to a spindle that is disposed at right angles to the rotating shaft 13, that is, an output shaft 16. It is rotationally driven by. The output shaft 16 is rotatably supported by a bearing 17 attached to the gear case 11b. The bearing 17 is attached to the gear case 11b by an annular holder 18 fixed to the gear case 11b. The holder 18 is coaxial with the output shaft 16 and is provided radially outward of the output shaft 16.

  In the grinding machine 10, a power tool main body 10a is configured by the motor case 11a, the gear case 11b, and the above-described members incorporated therein. An extension spindle 16a is screwed to the output shaft 16 of the power tool main body 10a, and a cup-type grinding wheel 21 as a tip tool is attached to the extension spindle 16a as shown in FIG.

  The grindstone wheel 21 has a base 22 formed in a cup shape, and a plurality of diamond grindstones 23 are fixed to the front outer periphery of the base 22 by means such as adhesion. The grindstone wheel 21 is attached to the extension spindle 16a by a lock nut 26 as a fastening member that is screwed to a male screw portion 25 provided at the tip of the extension spindle 16a. Is provided.

  A dust collecting adapter 27 is detachably attached to the power tool main body 10a. The dust collecting adapter 27 includes a dust collecting fan 28 that is rotated together with the grinding wheel 21 by the electric motor 12, and a dust collecting cover 30 that houses the dust collecting fan 28 and covers the outside of the grinding wheel 21 in the radial direction. doing. The dust collection fan 28 has a disk portion 28a and a plurality of blade portions 28b provided on the front side thereof, and a boss portion 28c at the center in the radial direction of the dust collection fan 28 is fitted to the extension spindle 16a. It is fixed. The extension spindle 16a has a two-sided width structure in which a phase is shifted by 180 degrees in the circumferential direction, and the rotation of the output shaft 16 is transmitted to the dust collecting fan 28 via the extension spindle 16a. The

  The dust collection cover 30 includes an end wall portion 31, a cylindrical peripheral wall portion 32 on the front side of the end wall portion 31, and a partition wall portion 33 that faces the end wall portion 31 through the outer peripheral portion of the dust collection fan 28. A tool cover 34 is provided on the front side of the partition wall 33. The tool cover 34 has an inner diameter larger than the outer diameter of the grinding wheel 21 and covers the outer side in the radial direction of the grinding wheel 21. A boss portion 31a fitted to the holder 18 of the power tool body 10a is provided at the radial center of the end wall portion 31, and the dust collecting cover 30 is detachably attached to the holder 18 at the boss portion 31a. Is done.

  A fan housing chamber 35 is provided between the end wall portion 31 and the partition wall portion 33, and the dust collection fan 28 is incorporated in the fan housing chamber 35. A suction port 33a is formed in the partition wall 33, and when the dust collecting fan 28 is rotated, air flows into the fan housing chamber 35 from the outside through the suction port 33a. The volute channel 36 formed between the peripheral wall portion 32 and the outer periphery of the dust collecting fan 28 has a cross-sectional area that gradually increases toward the downstream side in the circumferential direction. The dust collection cover 30 is provided with a discharge duct, that is, a discharge port 37 so as to communicate with the most downstream side of the volute channel 36. Therefore, when the dust collection fan 28 rotates, an air flow is formed in which dust generated by the grinding process by the grinding wheel 21 enters the dust collection cover 30, and this air flow is directed toward the discharge port 37. In this way, a dust air flow toward the discharge port 37 is formed by the dust collecting fan 28.

  The dust collecting cover 30 is configured by combining first and second case halves 30a and 30b each formed of a resin material such as nylon. In the first case half 30 a, the end wall portion 31, a part of the peripheral wall portion 32, and a part of the discharge port 37 are integrated. In the second case half 30b, the remaining part of the peripheral wall part 32, the remaining part of the discharge port 37, and the partition wall part 33 are integrated, and the tool cover 34 is attached to the second case half 30b. And are attached.

  A dust-proof ring 38 is mounted inside the tool cover 34 so as to be movable in the axial direction of the output shaft 16. A spring force is applied to the dust-proof ring 38 in a direction protruding from the tip end surface of the tool cover 34 by a plate spring 39. When grinding the concrete surface or the like using the grinding wheel 21, the dust-proof ring 38 is used for the grinding wheel. The outer side in the radial direction of 21 is surely covered, so that dust can be reliably prevented from being blown out.

  The dust collecting adapter 27 is detachably attached to the power tool main body 10a. The grinding machine 10 shown in FIG. 1 includes a type with the dust collecting adapter 27 attached and a type without the dust collecting adapter 27. Can be switched. As shown in FIG. 1, in order to switch from the type with the dust collection adapter 27 attached to the type without the dust collection adapter 27, the grinding wheel 21 is removed from the extension spindle 16a and the dust collection fan 28 and the dust collection cover 30 are removed. Further, the extension spindle 16 a is detached from the output shaft 16 and the grindstone wheel 21 is directly attached to the output shaft 16.

  As shown in FIG. 1, a dust collection bag 40 is detachably attached to the cylindrical discharge port 37 of the dust collection cover 30. As shown in FIGS. 2 and 5, the dust collection bag 40 has a substantially rectangular shape as a whole, and has a double structure of an outer bag 41 made of cloth and an inner filtration part 42 inside thereof. ing. As shown in FIG. 5, the outer bag body 41 has a first bag piece portion 43a and a second bag piece portion 43b formed by bending a cloth sheet material. A connection port 45 is formed at one end in the longitudinal direction of the substantially rectangular outer bag body 41 by being displaced to one side in the width direction, and the connection port 45 is attached to the discharge port 37.

  A dust collection chamber 46 communicating with the connection port 45 is formed inside the outer bag body 41, and a dust air flow discharged from the discharge port 37 of the dust collection cover 30 is supplied into the dust collection chamber 46. A slit 48 is formed in one side in the width direction of the outer bag body 41, that is, the upper long side 47 in FIG. 2, and the other three sides are closed. The inner filtration part 42 is smaller than the outer bag body 41 and has a rectangular shape as a whole, and has a first filtration part 44a and a second filtration part 44b as shown in FIG. Yes. An opening 49 communicating with the slit 48 is formed on one side of the inner filtration part 42, the other three sides are closed, and the inside of the inner filtration part 42 is an exhaust chamber 51.

  The dust air flow that has flowed into the dust collecting chamber 46 is filtered and cleaned from the outer bag body 41 to the outside and exhausted, while being cleaned by the inner filtering portion 42 and exhausted to the exhaust chamber 51 and then discharged to the outside. become. In order to prevent both of the filtration units 44a and 44b constituting the inner filtration unit 42 from coming into close contact with the dust air flow that has flowed into the dust collection chamber 46, the exhaust chamber 51 is crushed. A spacer 52 is arranged. The spacer 52 is formed of a rectangular sponge having a higher air permeability than the cloth sheet material, and the spacer 52 has a thickness dimension that secures a space for the exhaust chamber 51. As the spacer 52, a porous sintered metal plate material may be used without using a sponge as long as the filtration parts 44 a and 44 b can be prevented from coming into close contact with each other, and a frame body formed by bending a wire is used. You may do it.

  A plurality of hooks 53 serving as fasteners are provided at a predetermined interval on the filter portions 44a and 44b constituting the inner filter portion 42 so as to be positioned on the opening side. As shown in FIG. 6, the female part 53a of the hook 53 is attached to one filtration part 44a, and the male part 53b of the hook 53 is attached to the other filtration part 44b. When the hooks 53 are engaged with each other in a state where the inner filtration part 42 is folded inside the outer bag body 41, as shown in FIG. It is possible to prevent the width of the slit 48 from being excessively widened.

  In order to hold the outer bag body 41 in a rectangular shape as shown in FIG. 3, a shape retaining wire 54 made of a wire is incorporated in the outer bag body 41. This wire 54 has an annular portion 54a for holding the connection port 45 provided in the outer bag body 41 in a cylindrical shape and fastening the connection port 45 to the discharge port 37, and is connected to the annular portion 54a. An operation knob portion 54 b that protrudes in the radial direction is provided outside the opening 45. When the two operation knob portions 54b are elastically deformed so as to approach each other, the inner diameter of the annular portion 54a is widened, and the connection port 45 can be easily attached to the discharge port 37. When the hand is released from the operation knob portion 54b, the annular portion 54a has a small diameter due to the elastic force, and the connection port 45 is fastened to the discharge port 37. The wire 54 is connected to each operation knob 54b and extends to the left piece and the upper long side 47 of the outer bag 41 in FIG. Since the wire 54 extends to the rear end portion of the long side 47, the outer bag body 41 is developed into a substantially rectangular state.

  FIG. 6 is a development view of the dust collection bag 40 showing a state in which the inner filtration part 42 is pulled out from the outer bag body 41. As shown in FIG. 6A, the outer bag body 41 is folded so as to overlap the bag pieces 43a and 43b, which are provided with connection ports 45 and become substantially rectangular as a whole, and close the portions other than the slit 48. To do. The right end portion in FIG. 6 of the outer bag body 41 is not provided with a seam allowance and is open, but a rail-like engagement member 55 is attached to close this portion.

  A filtration part 44a is provided continuously with the bag piece part 43a, and a filtration part 44b is provided with the bag piece part 43b. A female part 53a of a plurality of hooks 53 is sewn to the filtering part 44a, and a male part 53b that meshes with the female part 53a is sewn to the filtering part 44b. Of the two filtration parts 44a and 44b, three sides other than the side connected to the slit 48 of the outer bag body 41 are closed by seams or adhesion, and an exhaust chamber 51 is formed inside. As shown in FIG. 6, when the inner filtration part 42 is folded from the slit 48 into the outer bag body 41 with the inner filtration part 42 deployed with respect to the outer bag body 41, FIG. As shown, a dust collection bag 40 having an inner and outer double structure of the outer bag body 41 and the inner filtration part 42 is manufactured.

  For example, when a concrete material is ground by the grinder 10, a dust collecting adapter 27 is attached to the power tool main body 10a of the grinder 10, as shown in FIG. The dust generated by the grinding operation is guided to the discharge port 37 along the inner wall surface of the dust collecting cover 30 by the inertia force generated by the rotation of the grinding wheel 21 and the suction force of the dust collecting fan 28, and is collected by the dust collecting bag 40. It flows into the chamber 46. Thereby, the outer side bag body 41 will be in the swelled state as FIG. 7 and FIG. 8 shows. The cloth dust collection bag 40 functions as a filter. As indicated by arrows in FIG. 7, only air passes through the outer bag body 41 from the dust collection chamber 46 and is discharged to the outside, and dust is trapped inside. Is done. On the other hand, only air flows into the exhaust chamber 51 from the inside of the dust collection chamber 46 through the inner filtration portion 42, and the inflowed air passes through the air-permeable sponge as the spacer 52 and is discharged to the outside through the slit 48. And dust is trapped inside. FIG. 7 shows a state where the cleaned air is discharged to the outside and the dust 56 is collected in the dust collecting chamber 46.

  In this way, the dust air flow that has flowed into the dust collection bag 40 is filtered through the air through the bag pieces 43a and 43b of the outer bag body 41 and the filtration parts 44a and 44b of the inner filtration part 42. Therefore, the filtration area is larger than that of the dust collection bag consisting of only the outer bag body 41. Thereby, without increasing the size of the dust collection bag 40, the pressure loss in the flow path from the discharge port 37 of the dust collection cover 30 to the dust collection bag 40 can be reduced, and the dust collection efficiency is improved. Can do. In addition, since it is not necessary to increase the size of the dust collection bag 40, the operability of the power tool can be improved.

  When the dust collecting adapter 27 having the dust collecting bag 40 and the dust collecting cover 30 to which the dust collecting bag 40 is attached is attached to the grinding machine 10 as a power tool, the dust generated by the grinding process is collected in the dust collecting bag 40 and externally collected. Can be prevented from scattering. When an air flow is formed by the dust collecting fan 28 of the dust collecting adapter 27, the dust can be sucked and supplied to the dust collecting bag 40.

  When the plurality of inner filtration parts 42 are arranged inside the outer bag body 41, the filtration area can be increased without increasing the size of the dust collection bag 40.

  9 and 10 show a dust collection bag 40 in which two inner filtration portions 42a and 42b are folded inside the outer bag body 41. FIG.

  The dust collection bag 40 shown in FIG. 9 has two slits 48 a and 48 b formed adjacent to each other on the long side 47 side of the outer bag body 41. The inner filtration part 42a is folded into the inside of the outer bag body 41 from the slit 48a, and the inner filtration part 42b is folded into the inside of the outer bag body 41 from the slit 48b. Each inner filtration part 42a, 42b is the same direction so that the opening parts 49a, 49b are adjacent to each other. On the other hand, in the dust collection bag 40 shown in FIG. 10, the inner filtration part 42 a is folded into the inside of the outer bag body 41 from the slit 48 a formed on one long side 47 side of the outer bag body 41. On the other hand, the inner filtration part 42 b is folded into the inside of the outer bag body 41 from the slit 48 b formed on the other long side of the outer bag body 41.

  As described above, when the two inner filtration portions 42 a and 42 b are folded inside the outer bag body 41, the filtration area can be made larger than that of the dust collection bag 40 of the one inner filtration portion 42. 9 and 10, two inner filtration portions 42 a and 42 b are arranged in the outer bag body 41, but three or more inner filtration portions are arranged in the outer bag body 41. It may be arranged.

  11 and 12 show a dust collection bag 60 as a comparative example. If the dust collection bag 60 has a single structure, it is necessary to increase the size of the dust collection bag 60 in order to increase the filtration area. However, if the size is increased, the operability of the grinding machine 10 is reduced. On the other hand, when the dust collection bag 40 is formed by the outer bag body 41 and at least one inner filtration part 42 folded therein as in the present invention, dust can be collected without increasing the size of the dust collection bag 40. The filtration area as a filter for removal can be widened. Thereby, dust collection efficiency can be improved. The shapes of the outer bag body 41 and the inner filtration part 42 are not limited to the illustrated rectangle, and may be any shape such as a square.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, FIG. 1 shows a case where the dust collection bag 40 is mounted on the grinding machine 10, but the dust collection bag 40 is mounted on a cutting machine, and dust generated during cutting is collected by the dust collection bag 40. Also good. Although the grinding machine 10 as a power tool drives the rotating shaft 13 by the electric motor 12, the dust collecting adapter and the dust collecting tool are also used for a power tool such as a grinding machine of which the rotating shaft is driven by the air motor. A bag can be used.

DESCRIPTION OF SYMBOLS 10 ... Grinding machine, 10a ... Power tool main body, 11a ... Motor case, 11b ... Gear case, 12 ... Electric motor, 13 ... Rotating shaft, 14, 15 ... Bevel gear, 16 ... Output shaft, 16a ... Extension spindle, 17 ... Bearing, DESCRIPTION OF SYMBOLS 18 ... Holder, 21 ... Grinding wheel, 22 ... Base, 23 ... Diamond wheel, 25 ... Male thread part, 26 ... Lock nut, 27 ... Dust collecting adapter, 28 ... Dust collecting fan, 30 ... Dust collecting cover, 30a ... No. 1 half case, 30 b second half case, 31 end wall portion, 32 peripheral wall portion, 33 partition wall portion, 33 a suction port, 34 tool cover, 35 fan housing chamber, 36 Volute flow path, 37 ... discharge port, 38 ... dustproof ring, 39 ... leaf spring, 41 ... outer bag, 42 ... inner filtration part, 43a, 43b ... bag piece part, 44a, 44b ... filtration part, 45 ... contact Mouth, 46 ... dust collection chamber, 48 ... slit, 49 ... opening, 51 ... exhaust chamber, 52 ... spacer, 53 ... hook, 54 ... wire rod, 54a ... annular portion, 54b ... operation knob, 55 ... engagement member .

Claims (8)

A dust collection bag that is attached to the discharge port and collects dust generated when processing a workpiece.
A connection port to be attached to the discharge port is provided, and an outer bag body made of cloth that forms a dust collection chamber communicating with the connection port inside,
An inner filtration part having two surfaces facing each other inside the outer bag body;
A dust collection bag comprising a spacer for maintaining an interval between the inner filtration portions.   The dust collection bag according to claim 1, wherein the spacer has higher air permeability than the inner filtration part.   The dust collection bag according to claim 1 or 2, wherein an end of the inner filtration part forms a plurality of closed parts closed by a fastener.   The dust bag according to any one of claims 1 to 3, wherein the outer bag body has a plurality of inner filtration portions adjacent to each other.   The dust collection bag according to any one of claims 1 to 3, wherein the outer bag body has a plurality of inner filtration portions positioned on opposite sides of each other. A dust collecting adapter that is attached to a power tool that rotates a tip tool to process a workpiece and sucks and collects dust generated when processing the workpiece,
A dust collecting cover that is detachably attached to the power tool so as to cover the tip tool, and sucks dust;
A dust collection adapter comprising the dust collection bag according to claim 1.   The dust collecting adapter according to claim 6, further comprising a dust collecting fan driven by a rotating shaft that rotationally drives the power tool.   The power tool provided with the dust collection bag or dust collection adapter of any one of Claims 1-7.

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