JP2008229850A - Drilling tool with dust collecting mechanism - Google Patents

Abstract

To provide a drilling tool with a dust collection mechanism capable of collecting dust with a small particle diameter that passes through a filter without causing a decrease in dust collection efficiency.
SOLUTION: A motor (drive source) 18, a rotation transmission mechanism for transmitting a rotational force of the motor 18 to a tip tool 26, and dust generated by drilling a work material W by the tip tool 26 are collected by a filter 13. In a perforating tool (hammer drill) with a dust collection mechanism equipped with a dust collection mechanism that collects dust in the dust collection housing 8 and the dust collection case 12 (dust collection container), the dust collection housing 8 and the dust collection case 12 are charged by static electricity. Charging means is provided. Here, the charging unit includes, for example, a brush attached to the outer periphery of the dust collecting fan 14 or a brush attached to the inner wall of the dust collecting housing 8 around the dust collecting fan 14.
[Selection] Figure 1

Description

  The present invention relates to a drilling tool with a dust collection mechanism capable of collecting dust generated when drilling concrete or the like to improve the environment for a work site and an operator.

  Conventionally, as a drilling tool for drilling a stone material such as concrete or brick, a drill tool, a hammer drill or a rotary drill for rotating a tip tool is generally used. When a stone is drilled using this type of drilling tool, dust is generated, and therefore, an operator wears a dust mask, protective glasses, and the like during work.

In order to improve the above situation, a drilling tool having a dust collection mechanism that collects dust generated during drilling using a fan provided in the housing has been proposed (see Patent Documents 1 to 3). .
JP 2005-297318 A

  A conventional drilling tool equipped with a dust collection mechanism drills a work material by the tool body rotating and driving the tip tool, and dust generated during drilling is collected by the spiral structure of the tip tool. It moves to the dust adapter, is guided to the dust flow path together with the air by the suction force of the dust collecting fan, is separated from the air by the filter in the dust collecting case, and is stored in the dust collecting case.

  However, the dust generated at the time of drilling is mixed with a large particle size and a small particle size. Dust with a very small particle size is not filtered by the filter and is discharged as it is through the filter. There was a problem.

  Therefore, it is conceivable that the filter is made finer and dust having a small particle diameter is also filtered by the filter. However, if the filter is made finer, the problem arises that the air path resistance increases and the dust collection efficiency deteriorates.

  The present invention has been made in view of the above-mentioned problems, and its intended treatment is with a dust collection mechanism that can collect dust having a small particle diameter that passes through a filter without causing a decrease in dust collection efficiency. It is to provide a drilling tool.

  In order to achieve the above object, the invention according to claim 1 is directed to a driving source, a rotation transmission mechanism that transmits the rotational force of the driving source to the tip tool, and dust generated by drilling a work material by the tip tool. A perforating tool with a dust collection mechanism provided with a dust collection mechanism that collects dust with a filter and collects it in the dust collection container is provided with charging means for charging the dust collection container of the dust collection mechanism with static electricity.

  According to a second aspect of the invention, in the first aspect of the invention, the charging unit generates static electricity by a driving force of the driving source.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the charging unit includes a brush attached to an outer periphery of a dust collecting fan that is rotationally driven by the driving source. .

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the charging unit includes a brush attached to an inner wall of the dust collecting container around a dust collecting fan that is rotationally driven by the driving source. It is characterized by being.

  According to the present invention, charging means for charging the dust collecting container of the dust collecting mechanism with static electricity (for example, a brush attached to the outer periphery of the dust collecting fan or a brush attached to the inner wall of the dust collecting container around the dust collecting fan) In the past, fine dust particles with a small particle diameter that were not captured by the filter but were passed through the filter are adsorbed by the electrostatic force to the charged dust collection container or filter, and externally as in the past. They are not discharged as they are, but are reliably captured and collected by the dust collection mechanism.

  And since the said effect is acquired without roughening the eyes of a filter, high dust collection efficiency can be ensured by keeping air path resistance low.

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

  1 and 2 are broken side views of a hammer drill with a dust collecting mechanism as an embodiment of a drilling tool with a dust collecting mechanism according to the present invention, and FIG. 3 is an enlarged broken view of the main part of the hammer drill.

  As shown in FIG. 1, the hammer drill with a dust collecting mechanism according to the present embodiment (hereinafter simply referred to as “hammer drill”) is detachable from the gear housing 1, the motor housing 2, the handle 3, and the tip tool 26. A tip tool holding unit 4 to be mounted and a dust collecting mechanism to be described later are provided.

  The hammer drill according to the present embodiment has at least three operation modes: a rotation / striking mode that applies rotational force and impact force to the tip tool 26, a rotational mode that provides only rotational force, and an impact mode that provides only impact force. The operation mode can be switched by operating an internal switching mechanism (not shown) by rotating a switching dial 6 provided on the side of the gear housing 1. This hammer drill cuts and drills the work material W by striking or rotating, or striking and rotating. However, since the striking motion is generated by the reciprocating motion of the tip tool 26, vibration is generated.

  The handle 3 has one end connected to the gear housing 1 and the other end connected to the motor housing 2, which is provided with a power switch 3 a and an electric cord 5 for feeding.

  A motor 18 as a drive source is accommodated in the motor housing 2, and a cooling fan 17 is attached to an output shaft (motor shaft) 19 of the motor 18. When the motor 18 is started and the cooling fan 17 rotates, cooling air enters the motor housing 2 from a cooling air inlet (not shown) of the tail cover 16 attached to the lower end (lower side in FIG. 1) of the motor housing 2. The motor 18 is cooled by the cooling air. And the cooling wind which passed the circumference | surroundings of the motor 18 is discharged | emitted outside through the discharge port not shown.

  The tip tool 26 has a tip portion 26a for crushing the work material W and a spiral portion 26b for moving dust generated by crushing the work material W within the perforation hole. The workpiece W is cut and drilled by the rotation of the tip tool 26.

  The dust collecting mechanism is disposed between the gear housing 1 and the motor housing 2 and has a portion that is sandwiched and a portion that protrudes between the motor housing 2 and the tip tool 26 (the left portion in FIG. 1). A dust housing 8 is provided. As shown in FIG. 2, the dust collection housing 8 has a first opening 8a, a second opening 8b, a third opening 8c, and a recess 8d.

  A dust collection fan 14 that rotates integrally with the output shaft 19 is attached to the output shaft 19 of the motor 18 inside the dust collection housing 8, and the motor 18 is activated to collect the dust. When the dust fan 14 rotates, air flows into the dust collecting housing 8 through the third opening 8c, and the air flowing into the dust collecting housing 8 is discharged to the outside through a discharge port (not shown).

  By the way, a dust collecting case 12 is detachably attached to the dust collecting housing 8. The dust collecting case 12 includes a convex portion 12a that can be engaged with the concave portion 8d of the dust collecting housing 8, and a tail cover. The latch part 12b which can be engaged with the recessed part 16a formed in 16 is formed. Here, the concave portion 8d, the concave portion 16a, the convex portion 12a, and the latch portion 12b are provided on the diagonal line of the dust collecting case 12, and the dust collecting case 12 is formed by the concave portions 8d, 16a, the convex portion 12a, and the latch portion 12b. It is attached to and detached from the dust collecting housing 8.

  As shown in FIG. 1, when the dust collection case 12 is attached to the dust collection housing 8, the second opening 8 b of the dust collection housing 8 and the first opening 12 c of the dust collection case 12 are connected. At the same time, the third opening 8c of the dust collecting housing 8 and the second opening 12d of the dust collecting case 12 are connected. The dust collecting housing 8 is provided with a seal member 20, which is configured to be stretchable and deformable in the insertion direction of the dust collection case 12. It contacts and seals the connecting portion between the dust collecting case 12 and the dust collecting housing 8.

  That is, the seal member 20 includes a gap at the joint between the second opening 8b of the dust collecting housing 8 and the outer periphery of the first opening 12c of the dust collecting case 12, and the third opening of the dust collecting housing 8. The gap at the joint between 8c and the second opening 12d of the dust collecting case 12 is filled. Here, the first opening 12 c of the dust collection case 12 constitutes an inflow port through which air and dust flow into the dust collection case 12. Further, the second opening 12 d of the dust collection case 12 constitutes an outlet that allows air to flow out of the dust collection case 12. The seal member 20 prevents leakage of air and dust from the joint between the dust collecting housing 8 and the dust collecting case 12 near the inlet and the outlet.

  A filter 13 that can be fixed to the dust collection case 12 is provided inside the dust collection case 12. Further, a dust storage portion 21 and an air passage 15 are formed inside the dust collection case 12. The filter 13 is disposed between the dust storage unit 21 and the air passage 15, and air can flow into the air passage 15 via the filter 13, but the dust is captured by the filter 13. The dust stays in the dust storage unit 21 and is collected.

  In addition, the dust collection mechanism includes a dust collection adapter 10 that collects dust generated by drilling the work material W with the tip tool 26, and the dust collection adapter 10 collects dust with a flexible dust collection hose 11. The first housing 8 is connected to the first opening 8a. Here, the tip tool 26 penetrates the dust collection adapter 10, and the dust collection adapter 10 is supported by an extendable support member 31 attached to the hammer drill body (the gear housing 1 and the dust collection housing 8). In addition, it is always in contact with the work material W. Although not shown, the dust collecting adapter 10 is formed with a hole through which the tip tool 26 is inserted, and a brush that closes the gap between the tip tool 26 and the hole is provided in the hole. Yes. As a result, leakage of dust from the tip tool 26 and the hole is prevented.

  The support member 31 includes cylindrical members 31a, 31b, and 31c. The cylindrical members 31a and 31b are slidable, and the cylindrical member 31c is a hammer drill body (gear housing 1 and dust collecting housing 8). It is fixed to. Therefore, the support member 31 can be expanded and contracted in a lens barrel type, and is always urged in the extending direction by the spring 32 that is retracted therein, so that the dust collecting adapter 10 is placed on the surface of the work material W as described above. Always pressing.

  Thus, in the hammer drill according to the present embodiment, as shown in FIG. 3, a brush 27 slidably contacting the inner wall of the dust collecting housing 8 is attached to the outer periphery of the dust collecting fan 14. 27 constitutes a charging means.

  Next, the operation of the hammer drill configured as described above will be described.

  In the hammer drill according to the present embodiment, when the operator operates the power switch 3a provided on the handle 3, the motor 18 is supplied with power through the electric cord 5 and the motor 18 is activated, and the rotation thereof is performed by the tip tool. 26, the drilling operation is started. Further, as the motor 18 rotates, the dust collecting fan 14 rotates, and dust generated by the drilling by the tip tool 26 flows into the dust collecting adapter 10 together with air as indicated by an arrow in FIG. The air with dust flows into the dust collecting hose 11 from the dust collecting adapter 10 and flows into the dust collecting housing 8 from the first opening 8 a of the dust collecting housing 8. Thereafter, the air with the dust flows from the second opening 8b of the dust collecting housing 8 into the first opening 12c of the dust collecting case 12, and is separated from the dust by the filter 13.

  Thus, the dust captured by the filter 13 stays in the dust storage unit 21 in the dust collection case 12, and the air flows through the filter 13 into the air passage 15 in the dust collection case, and the dust collection case 12. Flows into the third opening 8c of the dust collecting housing 8 from the second opening 12d. The air flowing into the dust collection housing 8 is discharged to the outside from a discharge port (not shown) formed in the dust collection housing 8.

  By the way, in this embodiment, since the brush 27 is attached to the outer periphery of the dust collecting fan 14 as described above, the brush 27 rotates with the dust collecting fan 14 and rubs against the inner wall of the dust collecting housing 8. In order to generate static electricity, the dust collecting housing 8, the dust collecting case 12, and the filter 13 are charged. For this reason, fine dust particles having a small particle diameter that have not been captured by the filter 13 and have passed through the filter in the past are applied to the charged dust collection housing 8, dust collection case 12, and filter 13 by electrostatic force. It is adsorbed and is not directly discharged to the outside as in the prior art, but is reliably captured and recovered by the dust collection mechanism.

  And since the said effect is acquired without roughening the eyes of the filter 13, high dust collection efficiency can be ensured by keeping air path resistance low.

  In this embodiment, the brush 27 is attached to the outer periphery of the dust collecting fan 14, but as shown in FIG. 4, the brush 27 is attached to the inner wall of the dust collecting housing 8, and the brush 27 and the dust collecting fan 14 are attached. It is also possible to generate static electricity by rubbing with.

  Although the present invention has been described with respect to a mode in which the present invention is applied to a hammer drill driven by a motor, the present invention can be similarly applied to a drilling tool driven by any other driving source such as an engine. Of course there is.

It is a fracture side view of a drilling tool with a dust collecting mechanism (hammer drill) according to the present invention. It is a fracture side view of a drilling tool with a dust collecting mechanism (hammer drill) according to the present invention. It is a fracture | rupture enlarged view of the principal part of a drilling tool with a dust collection mechanism (hammer drill) based on this invention. It is a fracture | rupture enlarged view of the principal part of a drilling tool with a dust collection mechanism (hammer drill) concerning another form of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gear housing 2 Motor housing 3 Handle 3a Power switch 4 Tip tool holding part 5 Power supply cord 6 Switching dial 8 Dust collection housing (dust collection container)
8a First opening of dust collecting housing 8b Second opening of dust collecting housing 8c Third opening of dust collecting housing 8d Recess of dust collecting housing 10 Dust collecting adapter 11 Dust collecting hose 12 Dust collecting case ( Dust collector)
12a Convex part of dust collecting case 12b Latch part of dust collecting case 12c First opening part of dust collecting case 12d Second opening part of dust collecting case 13 Filter 14 Dust collecting fan 15 Air passage 16 Tail cover 16a Convex part of tail cover 17 Cooling fan 18 Motor (drive source)
19 Motor output shaft (motor shaft)
DESCRIPTION OF SYMBOLS 20 Seal member 21 Dust storage part 26 Tip tool 26a Tip part of tip tool 26b Spiral part of tip tool 27 Brush (charging means)
31 Support member 31a-31c Cylindrical member of support member 32 Spring W Work material

Claims (4)

A drive source, a rotation transmission mechanism that transmits the rotational force of the drive source to a tip tool, and a dust collection mechanism that collects dust generated by drilling a work material by the tip tool with a filter and collects it in a dust collection container In a drilling tool with a dust collecting mechanism equipped with
A perforating tool with a dust collecting mechanism, comprising a charging means for charging the dust collecting container of the dust collecting mechanism with static electricity.   The perforating tool with a dust collecting mechanism according to claim 1, wherein the charging means generates static electricity by a driving force of the driving source.   The perforating tool with a dust collecting mechanism according to claim 1 or 2, wherein the charging means includes a brush attached to an outer periphery of a dust collecting fan that is rotationally driven by the drive source. 3. The perforation with a dust collecting mechanism according to claim 1, wherein the charging means is configured by a brush attached to an inner wall of the dust collecting container around a dust collecting fan that is rotationally driven by the driving source. tool.

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