JP6379004B2 - Dust collection attachment and electric tool - Google Patents

Description

  The present invention relates to a dust collection attachment and an electric tool that enable dust collection by passing through a bit of an electric tool such as an electric hammer and connecting to an external dust collector.

  In an electric tool such as an electric hammer, in order to collect dust generated at the time of crushing work by a bit, an external dust collector is passed through a hose through a dust collection attachment as disclosed in Patent Document 1 through the bit. To connect with. This dust collection attachment is a tapered cylinder that opens downward, with a cylindrical hose connection projecting on the upper surface, and operating the dust collector with the lower end in contact with the work surface. The generated dust can be sucked from the opening without being scattered and collected in the dust collector via the hose.

European Patent Application No. 2474386

  In the above conventional dust collection attachment, the cylindrical body is partially divided by providing a slit in the axial direction for the purpose of preventing the generation of excessive negative pressure and easily taking in and out the bit. However, this slit is likely to cause deformation during work, and the suction force may be reduced due to the deformation, leading to deterioration of dust collection efficiency.

  Accordingly, an object of the present invention is to provide a dust collection attachment and a power tool capable of preventing the generation of excessive negative pressure without providing a slit and maintaining a suitable dust collection efficiency.

In order to achieve the above-mentioned object, the invention according to claim 1 includes a main body portion that is penetrated by a bit of an electric power tool that is used in a downward direction with a bit attached to the lower end, and a through-hole portion of the bit. Dust generated from around the bit by connecting an external dust collector to the hose connection part through the hose and grounding the opening to the work surface. the dust collecting attachment which enables suction through the opening, the lower end of the body portion, the two notches capable of forming a gap between the plane perpendicular to the bit in the state that caused the suction force, the plane Are formed so as to be curved upward on the left and right sides with respect to one direction parallel to each other so that the center in the front-rear direction in the one direction is higher than the front-rear end .
According to a second aspect of the present invention, in the configuration of the first aspect, the notch is formed to be curved in a dimension longer than the penetrating portion of the bit in the one direction .
According to a third aspect of the present invention, in the configuration of the first or second aspect , the main body has an elliptical shape in plan view, and the notch is formed in the major axis direction of the main body parallel to the one direction. It is characterized by.
According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the air flow area in the main body is gradually narrowed toward the inner surface of the hose connection portion of the main body on the continuous side. It is characterized in that an inclined portion that is inclined is provided.
In order to achieve the above object, the invention according to claim 5 is an electric power tool, wherein the dust collecting attachment according to any one of claims 1 to 4 is passed through a bit attached to a lower end. It is characterized by.

According to invention of Claim 1 and 5 , since generation | occurrence | production of an excessive negative pressure can be prevented by providing a notch, the possibility that it will adsorb | suck to a work surface falls and suitable workability | operativity can be maintained. In addition, since the main body is not provided with a slit, it is difficult to be deformed during work, and a suitable dust collection efficiency can be maintained.
Further, by forming the notches on both the left and right sides , the left and right balance is achieved, and the main body portion is less likely to tilt.
According to the second aspect of the present invention, in addition to the effect of the first aspect, the notch is formed in a curved shape with a long dimension, so that a long gap can be secured at the time of suction, and the possibility of suction is reduced.
According to invention of Claim 3 , in addition to the effect of Claim 1 or 2 , since the main-body part is made into an elliptical shape and the notch is formed in the major axis direction, it does not cover the work surface widely. The necessary gap can be secured for a long time.
According to invention of Claim 4 , in addition to the effect in any one of Claims 1 thru | or 3 , by employ | adopting an inclination part, the flow rate goes up and it leads to the improvement of dust collection efficiency.

It is a perspective view of the electric hammer which equipped with the dust collection attachment. It is explanatory drawing of a dust collection attachment, (A) shows a center longitudinal cross-section, (B) shows a bottom face, respectively. It is explanatory drawing of a 1st hose holder, (A) shows the side surface by the side of a band latching | locking part, (B) shows AA line cross section, (C) shows the side surface by the side of a band connection part, respectively. It is a perspective view of the 2nd hose holder. It is a center longitudinal cross-sectional view of the dust collection attachment of the example of a change. It is explanatory drawing of the 1st hose holder of the example of a change, (A) is a fastening state, (B) is an attachment state, (C) shows the cancellation | release state of a ratchet nail | claw, respectively. It is explanatory drawing of the 1st hose holder of the example of a change.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of an electric hammer equipped with a dust collection attachment. First, an electric hammer 1 is connected to a lower housing 3 having a striking mechanism portion below an upper housing 2 having a motor. A tool holder 5 is provided at the lower end of a cylindrical barrel portion 4 formed at the lower end of the housing 3 so that the bit 6 can be attached and detached downward. 7 and 7 are handles provided on the left and right sides of the upper housing 3, each having a switch lever 8, 9 a power cord, and 10 a tool retainer for retaining the bit 6 mounted on the tool holder 5.

  The bit 6 is provided with a dust collection attachment 20 to which a dust collecting hose 11 is connected. As shown in FIG. 2, the dust collection attachment 20 is connected to a cup-shaped main body 21 having an elliptical shape in plan view and an opening at the lower end, and one side in the major axis direction on the upper surface of the main body 21. It is made of rubber composed of a cylindrical hose connection portion 22. In the single dust collection attachment 20 shown in FIG. 2, the left side is assumed to be the front and the right side is assumed to be the rear. The main body 21 has an upper plate 23 that closes the upper surface, and a side plate 24 that is formed downward from the periphery of the upper plate 23, and the upper plate 23 has a cylindrical portion 25 in which the through hole 26 of the bit 6 is formed. Are connected downward. On the inner surface of the cylindrical portion 25, vertical ribs 27, 27,... Are formed which engage with the outer surface of the bit 6 inserted together with the reinforcement of the cylindrical portion 25 to generate resistance in the rotational direction. Further, the upper plate 23 is formed so as to gradually increase in thickness as it goes forward from the connection with the hose connection portion 22, and the lower surface of the upper plate 23 excluding the tube portion 25 is connected to the hose connected from the front end to the rear. The inclined surface 28 is inclined upward toward the portion 22.

  An elliptical opening 29 serving as a suction port is formed at the lower end of the side plate 24. The opening 29 is formed so that the entire circumference is located on a plane orthogonal to the axis of the cylindrical portion 25. In addition, notches 30 and 30 that are curved upward are formed on the left and right sides of the side plate 24 so that the center in the front-rear direction is higher than the front-rear end. The notches 30 and 30 are symmetric with respect to the cylindrical portion 25 that is the penetrating portion of the bit 6, and are formed to be longer than the cylindrical portion 25 in the front-rear direction. It coincides with the lower end of the cylindrical portion 25.

Further, an inclined plate 31 is formed on the inner surface of the rear side of the main body portion 21 as an inclined portion that is inclined downward as it goes forward, and whose lower end is connected to the lower end of the side plate 24 to form the rear inner edge of the opening 29. Has been. Reference numeral 32 denotes a reinforcing rib provided on the lower surface of the inclined plate 31, and the inclined plate 31 allows the ventilation area of the opening 29 to be narrowed more than the inside of the main body portion 21.
On the other hand, the hose connection portion 22 rises obliquely rearward from the upper plate 23 behind the cylindrical portion 25, and a spiral groove 33 for screwing and connecting the end portion of the hose 11 is formed on the inner surface on the distal end side. Yes. A pair of rectifying plates 34, 34 in the front-rear direction is provided at the base in the hose connecting portion 22 at a predetermined interval on the left and right.

  Further, a first hose holder 40 is attached to the barrel portion 4 of the electric hammer 1, a second hose holder 41 is attached to the power cord 9, and the hose 11 connected to the hose connection portion 22 is The first hose holder 40 and the second hose holder 41 are respectively held and connected to an external dust collector. As shown in FIG. 3, the first hose holder 40 includes a synthetic resin holder 42 capable of holding the hose 11 and a rubber band 43 connected to the holder 42. The holder 42 is provided with a pair of gripping pieces 44, 44 in the center and can hold the hose 11 elastically between the gripping pieces 44, 44. Each is provided with a band locking portion 46. The band connecting portion 45 includes a concave portion 48 with a screw boss 47 projecting at the center, and a holder plate 50 that fits into the concave portion 48 and is fixed to the screw boss 47 with a screw 49. By passing through and fixing the holder plate 50 with screws 49 from the outside, the band 43 is connected in a retaining state.

  The band locking portion 46 includes a pair of guide plates 51, 51 erected at intervals at which the band 43 can be fitted, and a hook 52 that protrudes between the guide plates 51, 51. At the other end of the band 43, a plurality of locking holes 53, 53... Capable of locking the hook 52 are arranged in a straight line in the longitudinal direction of the band 43. Therefore, when the other end of the band 43 around which the barrel portion 4 is wound is fitted between the guide plates 51 and 51 and the hook 52 is locked in any one of the locking holes 53, the other end is connected to the band. Locked to the stop 46. In the middle portion of the band 43, a plurality of bottomed holes 54, 54,... Having the same shape as the locking holes 53 and closed on the inner peripheral side of the band 43 are arranged in parallel. While ensuring flexibility, it is possible to prevent dust from entering inside.

Thus, since the holder 42 and the band 43 are integrated, the first hose holder 40 can be easily attached to and detached from the barrel portion 4 and has excellent handleability.
As shown in FIG. 4, the second hose holder 41 includes a clip-shaped small clamp 55 that can elastically hold the power cord 9, and a C-shaped large clamp 56 that can elastically hold the hose 11. Is a molded product made of synthetic resin.

  In the dust collection attachment 20 configured as described above, the bit 6 attached to the tool holder 5 is inserted into the through hole 26 of the cylinder part 25 of the main body part 21 from above to penetrate the cylinder part 25, and the hose connection part 22 is connected to the hose. 11 ends are screwed in and connected. On the other hand, the band 43 of the first hose holder 40 is wound around the barrel portion 4 of the electric hammer 1 and the first hose holder 40 is attached, and the small clamp 55 of the second hose holder 41 is fitted to the power cord 9. In this state, the hose 11 connected to the hose connection portion 22 is pulled upward and elastically held by the grip pieces 44, 44 of the first hose holder 40, and then the hose 11 is further increased to the size of the second hose holder 41. When the clamp 56 is elastically held and connected to an external dust collector, the dust collection system is set.

  Therefore, when the concrete is crushed by the electric hammer 1, if the external dust collector is operated with the opening 29 at the lower end of the dust collection attachment 20 being in contact with the work surface, the crushed is generated from the periphery of the bit 6. The dust is sucked into the main body portion 21 from the opening 29 without being scattered, and is collected from the hose connection portion 22 through the hose 11 to the dust collector. At this time, since the ventilation area of the opening 29 is narrowed by the inclined plate 31 at the rear end, the flow velocity of the air passing therethrough increases, and the dust is efficiently combined with the inclination of the inclined surface 31 of the inclined plate 31 and the upper plate 23. Sucked. The opening 29 of the main body 21 has a slight gap between the left and right cutouts 30 and 30 even when a suction force is generated, and the entire circumference does not contact the work surface. The inside of 21 does not become an excessive negative pressure. Therefore, there is no possibility that the main body 21 is attracted to the work surface and hinders the work.

  Thus, according to the electric hammer 1 using the dust collection attachment 20 of the above-described form, the notch 30 capable of forming a gap between the lower end of the main body portion 21 and the work surface in a state where suction force is generated. Since the generation of an excessive negative pressure in the main body portion 21 can be prevented, the possibility of being adsorbed on the work surface is reduced, and suitable workability can be maintained. In addition, since the main body 21 is not provided with a slit, it is difficult to be deformed during work, and a suitable dust collection efficiency can be maintained.

In particular, here, the notch 30 is curved with a dimension longer than that of the cylindrical portion 25 in the front-rear direction, so that a long gap can be secured during suction, and the possibility of suction is reduced.
In addition, since the notches 30 are formed at two point-symmetrical positions with the cylindrical portion 25 as the center, the left and right balance is achieved and the main body portion 21 is difficult to tilt.
Furthermore, since the notch 30 is formed in the major axis direction of the main body 21 in an elliptical shape in plan view, the work surface is not covered widely, and a long necessary gap can be secured.
And by providing the inclined plate 31 which inclines in the direction which gradually narrows the ventilation area in the main-body part 21 as it goes below on the inner surface by the side of the hose connection part 22 in the main-body part 21, a flow rate goes up and dust collection efficiency It leads to improvement.

In addition, the notch is not limited to the case where one is provided on each of the left and right sides of the opening of the main body as in the above embodiment. For example, two notches 30, 30 are provided on the left and right as shown in FIG. It can also be provided and wavy. If a plurality of the cutouts 30 are provided in this way, the lower end of the main body 21 can be grounded to the work surface between the cutouts 30 and the posture is easily stabilized. Also in the case of this continuous formation, it is desirable to provide it at a point-symmetrical position with the cylindrical portion 25 as the center.
In addition, the notch is not limited to a curved shape, but may be changed as long as it can form a gap with the work surface while maintaining the suction force, such as a triangular shape, a quadrangular shape, a trapezoidal shape, a semicircular shape, or a semielliptical shape. Is possible. Therefore, by increasing the number of such cutouts, the lower end of the main body portion can be formed into a saw blade shape or an uneven shape in addition to a wave shape.
Furthermore, the shape of the main body is not limited to an ellipse, and the main body may be oval or circular in plan view. In addition to the structure composed of the upper plate and the side plate, a cup shape such as a taper shape, a semicircular shape, or a bell shape that extends downward as a whole can be employed.
In addition, an inclination part is not limited to the inclination board of the said form, You may form in a block shape in the inner surface of a main-body part, and an inclination part may be abbreviate | omitted.

  On the other hand, the first hose holder is not limited to the structure in which the rubber band is locked to the hook, but, for example, a ratchet type as shown in FIG. 6 or a patchon lock (snap) type as shown in FIG. it can. In the first hose holder 60 of FIG. 6, one end of the flexible band 62 is coupled by a pin 61 at the band connecting portion 45 of the holder 43. In the band locking portion 46, the other end of the band 62 having a plurality of locking teeth 63, 63,... A ratchet pawl 64 that is urged to rotate in the direction of locking to the band 62 and a lever 65 that is provided with a gear portion 66 at the end and is urged to rotate toward the lying side are provided rotatably.

Therefore, when the lever 65 is rotated in the direction of the arrow as shown in FIG. 6A, the gear portion 66 is locked to the locking teeth 63 and the band 62 is fed in the insertion direction, so that the barrel portion 4 can be tightened. . When the lever 65 is tilted in the tightened state, the gear portion 66 is separated from the locking teeth 63 and the ratchet pawls 64 are locked to the locking teeth 63 as shown in FIG. Is completed. When removing, the outer end of the ratchet pawl 64 exposed through the window 67 provided in the lever 65 is pushed in from the direction of the arrow as shown in FIG. The band 62 can be extracted.
Also in the first hose holder 60, since the band 62 is provided integrally with the holder 43, the handleability is excellent. In addition, by adopting a ratchet, it can be firmly attached to the barrel portion 4 even with a light force, and can be easily removed with one touch.

In the first hose holder 70 of FIG. 7, at the band connecting portion 45 of the holder 42, one end of a flexible band 71 having radial cuts 72, 72,. Are connected. On the other hand, in the band locking portion 46, a plurality of locking recesses 74, 74,... Are formed on the outer surface at equal intervals in the circumferential direction. The portions are coupled by a pin 76, and one end of a locking plate 77 having an arc shape in a plan view is coupled by a pin 78 to an intermediate portion of the lock plate 75. Therefore, as indicated by a two-dot chain line, the lock plate 75 is raised outward with the pin 76 as the center, and the lock pin 79 provided at the other end of the lock plate 77 is locked to any of the lock recesses 74. In this state, the other end of the band 71 can be pulled in and fixed by pushing the lock plate 75 into the lying position indicated by the solid line.
Also in the first hose holder 70, since the band 71 is provided integrally with the holder 42, the handleability is excellent. Also, the snap-on structure makes it easy to attach and detach.

  Thus, the design of the second hose holder as well as the first hose holder can be changed as appropriate, but these hose holders are not essential in the dust collection system, and either one or both of the hose holders are omitted. It is also possible to do.

  1 .. Electric hammer 2.. Upper housing 3. Lower housing 4. Barrel 5. Tool holder 6. Bit 9 9 Power cord 11 Hose 20 Dust collection attachment, 21 .. Main body part, 22 .. Hose connection part, 23 .. Upper plate, 24 .. Side plate, 25 .. Cylindrical part, 29 .. Opening, 30 .. Notch, 31. 40, 60, 70 ··· First hose holder, 41 ··· Second hose holder, 42 ··· Holder, 43, 62, 71 · · Band, 45 · · Band connection portion, 46 · · Band lock Department.

Claims (5)

A main body portion that is penetrated by the bit of the electric tool that is used in a downward direction with a bit attached to the lower end, and a hose connection portion that is connected to the main body portion at an eccentric position from the penetrating portion of the bit A dust collection attachment that allows dust generated from around the bit to be sucked from the opening by connecting an external dust collector to the hose connection portion via a hose and grounding the opening to a work surface. Because
Two notches capable of forming a gap between the lower surface of the main body portion and a plane orthogonal to the bit in a state where suction force is generated, on both the left and right sides with respect to one direction parallel to the plane, A dust collecting attachment, wherein the dust collecting attachment is curved upward so that the center in the front-rear direction in each one direction is higher than the front-rear end . The dust collection attachment according to claim 1, wherein the notch is curved in a dimension longer than a penetrating portion of the bit in the one direction . 3. The dust collection attachment according to claim 1, wherein the main body has an elliptical shape in a plan view, and the notch is formed in a major axis direction of the main body parallel to the one direction. . The inner surface of the connecting side where the hose connections in the main body portion of claim 1 to 3, characterized in that a slope portion inclined to gradually narrowing direction venting area within the body portion toward downward The dust collection attachment described in any one. The electric tool formed by making the bit attached to a lower end penetrate the dust collection attachment in any one of Claims 1 thru | or 4 .

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