JP2011005843A - Drilling machine having dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drilling machine having a dust collector in which no sealing member comes off by increasing rigidity in the outer periphery of a distal end tool penetrating part of the sealing member.SOLUTION: The drilling machine includes: a motor, a transmission driving part that drives a distal end tool by transmitting a rotational force of the motor; and the dust collector that sucks dust produced from a workpiece drilled by the distal end tool. The dust collector is equipped with a through passage for making the distal end tool put through and a dust collecting adaptor that is formed in the through passage and that has a sucking port 11b for sucking dust. On the rear side of the through passage, there is installed the sealing member 20 having a through hole 22a for making the distal end tool put through and having a plurality of notches 22b. The sealing member 20 comprises a rigid member 21 and an elastic member 22 that is fixed to the rigid member. The rigid member 21 is composed of an annular steel plate while the elastic member 22 is of sheet-like rubber or the like, thereby increasing the rigidity of the sealing member 20.

Description

  The present invention relates to a drilling machine in which a dust collector attached to a drilling machine driven by an electric motor or an engine for drilling a hole in a stone material such as concrete or brick such as a hammer drill is improved.

  Drilling machines are used to drill holes in stone such as concrete and brick. A drilling machine drills a drilling hole in a work material by driving a drill blade, and includes a general rotary drill, a hammer drill that rotates and strikes the drill blade, and a vibration drill. When performing a drilling operation using a punching machine, dust is generated, so an operator may wear a dust mask, protective glasses, or the like to perform the operation. In recent years, in order to remove dust generated during work, a device provided with a dust collecting device for sucking up dust has been widely used.

  Patent Document 1 discloses a punching machine as an example, and the structure of the tip of a dust collector attached to the punching machine will be described with reference to FIG. A dust collecting adapter 110 of a conventional drilling machine is attached to a main body of a drilling machine (not shown), a part of the outer periphery of the tip tool 2 for drilling a work material, and a hole of the work material 18 that is drilled by the tip tool 2. The vicinity of the part is covered, and the work material 18 side is an opening. Dust generated by drilling with the tip tool 2 is sucked by the dust suction port 111b, passes through the dust collection passage 112b formed inside the connection member 112, and is connected to the opening 112c (not shown). Is sucked through.

  The dust collecting adapter section 110 is provided with a seal member 120 on the side of the connecting member 112 opposite to the work material (opposite to the work material, that is, the drilling machine side). The seal member 120 is made of an elastic material, and is formed with a through hole 120a that penetrates the tip tool 2 and cuts that extend radially from the through hole. On the outer peripheral side of the seal member 120, a folded portion 120b continuous in the circumferential direction is formed. On the other hand, the connecting member 112 is formed with a ring 112a protruding in an annular shape, and the sealing member 120 is fixed to the connecting member 112 by fitting the folded portion 120b into the rib 112a.

JP 2009-66721 A

  The sealing member 120 attached to the conventional dust collecting adapter 110 described above is made of an elastic body such as rubber and can be easily fixed simply by fitting the folded portion 120b into the rib 112a. In particular, it can be easily attached and detached from the rear side of the dust collection adapter unit 110 and is easy to use. However, since the seal member 120 is a thin rubber plate, pursuing the required specifications to minimize dust leakage and to collect dust with high accuracy, the rigidity is sufficient. It has become difficult to say. In the worst case, the seal member 120 may fall off the rib 112a due to the rotation of the tip tool 2. In addition, the seal member 120 may be damaged due to insufficient rigidity, resulting in an increase in dust leakage and poor dust absorption efficiency.

  On the other hand, since the dust collecting adapter part 110 penetrates the drill blade 2 and is disposed on the outer peripheral side of the drill blade 2, it is preferable that the axial thickness D is as thin as possible. This is because if the thickness is reduced, the effective cutting depth by the drill blade can be increased. However, a thickness corresponding to D1 is required for mounting the seal member 120. As a result, it is difficult to reduce the axial thickness D of the dust collection adapter 110.

  Further, in order to remove and replace the seal member 120, the seal member 120 cannot be removed while the drill blade 2 is attached as shown in FIG. 120 had to be replaced, and workability was poor.

  The present invention has been made in view of the above background, and an object of the present invention is to provide a drilling machine having a dust collecting device in which the sealing member does not come off from the dust collecting adapter part by increasing the rigidity of the sealing member. is there.

  Another object of the present invention is to provide a drilling machine having a dust collecting device in which the axial thickness of the dust collecting adapter portion is reduced to be compact.

  Still another object of the present invention is to provide a drilling machine having a dust collecting device in which a seal member can be replaced without removing a drill blade from the drilling machine.

 Of the inventions disclosed in the present application, typical features will be described as follows.

 According to one aspect of the present invention, a drive source, a transmission drive unit that transmits the rotational force of the drive source to drive the tip tool, and a dust collection that sucks dust generated from the work material drilled by the tip tool. In the drilling machine having the apparatus, the dust collecting device is provided with a dust collecting adapter having a through passage for penetrating the tip tool and a suction port for sucking dust formed in the through passage, and the transmission driving unit side of the through passage A sealing member having a through hole and a plurality of cuts through which the tip tool passes is provided, and the sealing member is constituted by a rigid member and an elastic member fixed to the rigid member. The rigid member can be a ring-shaped member and the elastic member can be a sheet-shaped member.

 According to another feature of the present invention, the elastic member is a sheet-like member formed with a through hole and a plurality of cuts, and is fixed to the ring-shaped member in a region other than the through hole of the elastic member and the region having the cut. Is done. The elastic member is fixed to the rigid member by adhesion or baking. The elastic member can also be manufactured by integral molding with the rigid member. The seal member is held by the constituent members of the dust collection adapter so as to be sandwiched from the front-rear direction in the axial direction of the tip tool.

 According to still another feature of the present invention, the dust collecting adapter is attached to the head cover having a cup shape opening to the work material side from the work material side with a sealing member and a cover member defining a through passage. To do. An anti-rotation portion is formed on the seal member, and the anti-rotation portion abuts against the inner wall of the head cover, thereby preventing the seal member from moving in the rotational direction. The cover member is made of a synthetic resin having elasticity, and the cover member forms a through passage and a suction port that opens into the through passage.

  According to the first aspect of the present invention, a through hole for penetrating the tip tool and a seal member having a plurality of cuts from the through hole are provided on the transmission drive unit side of the through passage, and the seal member is a rigid member and a rigid member. Since it is composed of a fixed elastic member, it is possible to increase the rigidity on the outer peripheral side of the through-passage of the seal member, to prevent the seal member from dropping and breaking, and to maintain good dust absorption efficiency.

  According to the invention of claim 2, since the rigid member is a ring-shaped member and the elastic member is a sheet-like member, the rigidity of the sheet member can be increased with a simple structure. Moreover, since it is not necessary to almost increase the thickness of a sealing member also by these structures, an installation area can be made small.

  According to the invention of claim 3, since the elastic member is fixed to the ring-shaped member in a region other than the region having the through hole and the cut, the sheet member is fixed to the ring-shaped member in a continuous region that is not cut. And the rigidity of the seal member can be sufficiently increased. Moreover, since there is no cut in the fixing (adhesion) surface of the ring-shaped member and the sheet member, sufficient durability can be realized.

  According to the invention of claim 4, the elastic member is a sheet-like member in which through holes and cuts are formed by punching, and the outer edges of the plurality of pleats defined by the cuts have a certain curvature. Since it is trimmed, it can be effectively prevented from being caught by the blade portion of the drill blade 2 that is penetrated, and the durability of the elastic member can be greatly improved.

  According to the invention of claim 5, since the shape of the through-hole is a substantially circular hole having a jagged cross-sectional shape, the contact area with the drill blade 2 is reduced, and the elastic member is rotated or moved in the axial direction. The force received by can be reduced.

  According to the invention of claim 6, since the elastic member is fixed to the rigid member by adhesion or baking, it can be reliably fixed by simple means.

  According to the seventh aspect of the present invention, since the seal member is integrally formed, the size and thickness of the seal member can be reduced.

  According to the invention of claim 8, the seal member is held by the constituent members of the dust collection adapter so as to be sandwiched from the front-rear direction in the axial direction of the tip tool, so that the thickness of the dust collection adapter is reduced. Can do. As a result, a sufficient movement stroke of the tip tool can be secured, and a deeper drilling operation can be performed.

  According to the ninth aspect of the present invention, the dust collecting adapter is attached to the head cover having a cup shape opening to the work material side from the work material side with the sealing member and the covering member defining the through passage. The seal member can be exchanged without removing the tip tool from the drilling machine, and an easy-to-use drilling machine can be realized. Moreover, since the head cover is pressed against the work material during the drilling operation, the covering member does not come off.

  According to the tenth aspect of the present invention, the seal member is formed with the rotation preventing portion, and the rotation preventing portion abuts against the inner wall of the head cover, thereby preventing the seal member from moving in the rotation direction. Thus, the seal member can be securely held.

  According to the eleventh aspect of the present invention, the covering member is made of a synthetic resin having elasticity, and the covering member forms the through passage and the suction port that opens in the through passage. Therefore, the covering member holds the sealing member. While functioning as a tool, it can play a role as a member formed by the through passage and the suction port, and an inexpensive manufacturing cost can be realized.

  The above and other objects and novel features of the present invention will become apparent from the following description and drawings.

It is sectional drawing which shows the whole punching machine based on the Example of this invention. 4 is a right side view of the dust collection adapter unit 10. FIG. It is sectional drawing of the AA part of FIG. FIG. 3 is an exploded view of the upper part (head cover part) of the dust collection adapter part 10. FIG. 3 is a front view of a state in which the right head cover 12 and the left head cover 13 are disassembled. It is a figure which shows the external appearance of the sealing member 20, (1) is a front view, (2) is a rear view, (3) is a side view. It is a front view of the dust cover 11. It is sectional drawing which shows the state of the dust collecting adapter part 10 at the time of a piercing | working operation | work. It is sectional drawing of the dust collection adapter which has the conventional sealing member. It is a figure which shows the external appearance of the sealing member which concerns on 2nd Example of this invention, (1) is a front view, (2) is a rear view, (3) is a cross section of the BB part of FIG. 10 (1). FIG. It is a schematic diagram for demonstrating the manufacturing method of the sealing member which concerns on the Example of this invention.

   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, parts having the same function are denoted by the same reference numerals, and repeated description is omitted. Further, in the present specification, description will be made assuming that the front and rear directions and the up and down directions are directions shown in the drawing.

  FIG. 1 is a sectional view showing an entire perforating machine according to an embodiment of the present invention. The drilling machine 1 has four operation modes, which are a rotation / blow mode, a rotation mode, a blow mode, and a neutral mode, as operation modes, and the main body housing 3 has a striking mechanism, a rotation transmission mechanism, and a switching mechanism. . A handle portion 3a is formed at the rear end portion of the main body housing 3, and a trigger switch 4 is provided on the handle portion 3a, and a power cord 5 for power supply is connected thereto. A tool holding portion 6 is provided at the front end of the main body housing, and a drill blade 2 is mounted on the tool holding portion 6, and the drill blade 2 receives a striking force and / or a rotational force and is required for the work material. Do the work. The drill blade 2 has a tip portion for crushing the work material 18 and a spiral portion having a function of moving dust generated by crushing the work material 18 within the drill hole.

  Near the tip of the drilling machine 1, there is provided a dust collection adapter 10 having a function of sucking dust generated by the drill blade and blowing air to the drill blade. The dust collection adapter unit 10 is held by the slider unit 50 of the dust collector so that the tip side is in contact with the work material 18 in the vicinity of the drill blade 2. The slider portion 50 is configured to include an outer fixed pipe 52, an outer movable pipe 51 inserted therein, an inner fixed pipe 54, and an inner movable pipe 53 inserted therein, and thereby, the dust collection passage 8 and the blowout passage. 9 is formed. The inside pipe is the dust collection passage 8 and the blow-out passage 9 is between the inner and outer pipes, and the two passages have a double structure that is coaxially arranged. The spring 55 is provided in the blowout passage 9, that is, between the outer movable pipe 51 and the inner fixed pipe 54, and urges the spring 55 in a direction away from each other, so that the spring 55 is fixed to the distal end of the outer movable pipe 51. The dust collecting adapter unit 10 is biased in the direction of the work material 18. A dust collection filter 57 for filtering the air mixed with the sucked dust is provided below the slider portion 50 of the dust collector. The dust collection filter 57 is disposed in a dust collection case 56 that is detachably attached.

  The main body housing 3 accommodates a motor 31 as a driving source in a vertically placed state, that is, its rotating shaft is vertical. The motor 31 is an AC motor having a rotor 31a and a stator 31b, and a pinion 34 is integrally formed at the upper end of an output shaft (motor shaft) extending upward from the motor 31. A crankshaft 35 and an intermediate shaft 42 are vertically and rotatably supported on both the front and rear sides of the output shaft of the motor 31, and gears are provided at intermediate height positions of the crankshaft 35 and the intermediate shaft 42, respectively. Are connected to each other, and these gears mesh with the pinion 34.

  At the upper part of the main body housing 3, a cylinder 36 is disposed horizontally at both axial ends thereof rotatably supported by ball bearings 44 and metal bearings 37. A piston 38 and a striker 39 are disposed in the cylinder 36. Is slidably fitted. The piston 38 is connected to the crankpin 43 of the crankshaft 35 via a connecting rod 40, and one end of the connecting rod 40 is connected to the piston 38 via a piston pin.

  The rotation of the crankshaft 35 is converted by the crankpin 43 and the connecting rod 40 into a reciprocating linear motion of the piston 38 in the longitudinal direction in the cylinder 36, and the internal pressure of the air chamber varies due to the reciprocating motion of the piston 38. As a result, the striker 39 reciprocates back and forth in the cylinder 36 and collides intermittently with the intermediate piece 41, so that the strike force is transmitted from the intermediate piece 41 to the drill blade 2.

  The gear, the crankshaft 35, the connecting rod 40, the cylinder 36, the piston 38, the striker 39, the intermediate piece 41, and the like described above constitute a striking mechanism, and the rotation of the output shaft of the motor 31 is caused by the striking mechanism. The reciprocating motion is converted to a striking force to the drill blade 2. In the simple rotation of the drill blade 2, the rotational force transmitted from the intermediate shaft 42 is transmitted to the cylinder 36 via the bevel gear mechanism, and the rotating portion including the intermediate shaft 42 constitutes a rotation transmission mechanism portion. The striking mechanism portion and the rotation transmission mechanism portion can be driven simultaneously or selectively, and all or a part of them constitutes a transmission driving portion for rotating or striking the drill blade.

  During rotation / blow mode operation, dust generated from the tip of the drill blade 2 is guided to the inside of the dust collecting adapter 10 together with the rotation of the drill blade 2 and the shape of the spiral portion, and the rotation shaft of the motor 31 By the suction force of the dust collecting fan 33 provided in the air, the air flows as shown by an arrow and is guided to the dust collecting passage 8 from the suction port 11b, and the air is collected by the dust collecting filter 57 in the dust collecting case 56. The dust separated and filtered is stored in the dust collection case 56. The dust collection case 56 is configured to be detachable from the dust collector, and dust stored in the dust collection case 56 can be easily discarded.

  The air filtered by the dust collection filter 57 passes through the air passage 58 and reaches the dust collection fan 33. Part of the air that has flowed into the dust collecting fan 33 is indicated by an arrow 19c for partially cooling the transmission drive unit in the main body housing 3 through an outlet formed in a cover that covers the periphery of the dust collecting fan 33. The remainder flows back to the slider unit 50. The air recirculated from the dust collection fan 33 flows through a flow path (not shown) to the positions indicated by arrows 19 a and 19 b and is sent to the dust collection adapter unit 10 through the blowout passage 9.

  When driving the drill blade 2, the motor 31 rotates and generates heat. In order to suppress the heat generation of the motor 31, a cooling fan 32 is provided on the rotating shaft of the motor 31 together with the dust collecting fan 33. The cooling air is sucked from the motor 31 to cool the motor 31. After cooling the motor, the cooling air reaches the cooling fan 32 and is discharged to the outside of the punching machine 1 through a discharge port (not shown).

  In the drilling work on the work material 18, the operator holds the handle portion 3 a of the drilling machine 1 and operates the trigger switch 4. When the motor 31 is driven and the rotational force of the motor 31 is transmitted, the drill blade 2 attached to the tip of the drilling machine 1 rotates and strikes. When the operator presses the drilling machine 1 in the direction of the work material, the drill blade 2 crushes the work material 18 and creates a hole in the work material.

  In the drilling operation, the operator further presses the drilling machine 1 forward as the drilling hole becomes deeper, and the drilling machine 1 moves in the direction of the work material 18. As the drilling machine 1 moves in the direction of the work material 18, the spring 55 is compressed by the force received from the dust collecting adapter unit 10, and a part of the outer movable pipe 51 enters the outer fixed pipe 52. At the same time, when a part of the inner movable pipe 53 enters the inner fixed pipe 54, the entire length of the slider portion 50 contracts. In this way, the dust collection adapter unit 10 is configured to always contact the work material 18. At that time, the slider portion 50 is held so as to be substantially parallel to the longitudinal direction of the drill blade 2, and the dust collecting adapter portion 10 moves rearward in the axial direction of the drill blade 2 with respect to the drilling machine 1. Thus, since the slider part 50 was set as the structure provided so that expansion-contraction is possible, dust collection corresponding to the depth of a perforation hole can be performed efficiently.

  Next, the structure of the dust collection adapter part 10 is demonstrated using FIG. FIG. 2 is a right side view of the dust collection adapter unit 10, and FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2. FIG. 2 shows a state where the dust collection adapter unit 10 is removed from the slider unit 50. In FIG. 2, the dust collection adapter part 10 is divided into two parts in the vertical direction: a head cover part (a part above the vicinity of 14e) and a connecting member 14 (a part below the vicinity of 14e). An opening 11c that faces the work material is formed on the front side of the head cover portion. On the side surface of the connecting member 14, a concave portion 14 e for connecting the upper portion of the dust collecting adapter portion 10 (the penetrating portion of the drill blade 2) and a convex portion 14 b for locking the outer movable pipe 51 are formed. Further, the connecting member 14 is provided with two locking portions 14a for attachment to the slider portion 50, and an inner peripheral side rib 14d inserted into the inner movable pipe 53 on the inner peripheral side therebetween, and an outer movable portion. An outer peripheral rib 14c connected to the pipe 51 is formed.

  In FIG. 3, the upper part of the dust collection adapter unit 10 is divided by a right head cover 12, a left head cover 13, and a dust cover 11. A seal member is inserted between the two head covers 12 and 13 and the dust cover 11, but will be described later because it is not shown in the cross-sectional position of FIG. 2. Since the right head cover 12, the left head cover 13, and the connecting member 14 are connected to each other by the latch means 12a, 12b, and 13b, they can be easily disassembled. As a result, a dust collection passage 8a connecting the dust collection passage 8 (see FIG. 1) from the suction port 11b is defined, and dust-mixed air flows in the dust collection passage 8a in the direction of the arrow (downward). Moreover, the blowing passage 9a connected with the blower outlet 11a from the blowing passage 9 (refer FIG. 1) is demarcated, and clean air flows in the direction (upward direction) of the arrow. The blower outlet 11a is manufactured by integral molding of a synthetic resin or the like as a part of the dust cover 11, and blows air forward from the dust collecting adapter part 10 through the blower outlet 11a to blow the work material.

  FIG. 4 is an exploded view of the upper portion (head cover portion) of the dust collection adapter portion 10 and is a view of the dust collection adapter portion 10 as viewed from the front side (work material side). The dust collection adapter unit 10 first joins the right head cover 12 and the left head cover 13 as shown by arrows. This joining is fixed only on the upper side by the latch means 12a. On the lower side, the right head cover 12 and the left head cover 13 are not fixed by the latch means. However, by attaching the assembly of the right head cover 12 and the left head cover 13 to the connecting member 14, the right head cover 12 is also provided in the lower portion. And the left head cover 13 are held in a joined state.

  By joining the right head cover 12 and the left head cover 13, the portion through which the drill blade 2 penetrates when viewed from the front side (work material) side is cup-shaped (however, there is a hole in the bottom center). ) The seal member 20 is inserted into the cup-shaped portion from the front. A rear surface (annular surface) which is the outer peripheral portion of the seal member 20 is positioned so as to contact the flat surface portion 13 f of the left head cover 13. In FIG. 4, the flat surface portion of the right head cover 12 is not visible, but the rear surface of the outer peripheral portion of the seal member 20 is in contact therewith. Thus, the seal member 20 is provided so as to be orthogonal to the tip tool, and is arranged so that the center of the through hole 22 a formed in the seal member 20 is concentric with the drill blade 2.

  Next, after the seal member 20 is inserted, the dust cover 11 is inserted into the cup-shaped depressions of the head covers 12 and 13 from the front side. The dust cover 11 is preferably a member that is manufactured by integral molding, such as synthetic resin, and has a certain degree of elasticity. The protrusion 11d formed on the dust cover 11 is fitted into the groove 13e formed on the left head cover 13, and the outer frame portion 11f forming the suction port 11b is fitted into the opening 13d formed on the left head cover 13. The dust cover 11 is fixed by combining them. The dust cover 11 is attached to the head cover part while the dust cover 11 is elastically deformed. When the dust cover 11 is attached, the rear surface 11 f of the dust cover 11 is in close contact with the front surface of the outer peripheral portion of the seal member 20. Thus, the seal member 20 is fixed so as to be held in the axial direction (front-rear direction) of the drill blade 2 by the dust cover 11 and the head cover portions (12, 13).

  In this embodiment, the sealing member 20 and the head cover portion (12, 13), and the sealing member 20 and the dust cover 11 need not be firmly fixed to each other by bonding or the like. Even if a strong force is applied to the seal member 20 in the front-rear direction by coming into contact with the drill blade 2, the seal member 20 falls off because it is sandwiched between the head cover portions (12, 13) and the dust cover 11. Because there is no. Further, the force applied to the dust cover 11 by pressing the dust collection adapter part 10 against the work material 18 is the same as the direction in which the dust cover 11 is attached to the dust collection adapter part 10. There is no risk of falling out of 10. On the other hand, since the seal member 20 is only sandwiched between the head cover parts (12, 13) and the dust cover 11, the seal member 20 can be easily replaced.

  Next, the structure of the right head cover 12 and the left head cover 13 will be further described with reference to FIG. FIG. 5 is also a view seen from the front side as in FIG. The split surfaces extending in the vertical direction of the right head cover 12 and the left head cover 13 are substantially the left and right centers on the upper side, but are offset on the left side instead of the center on the lower side. This is because the lower dividing surface is between the dust collection passage 8a and the blowout passage 9a. The right head cover 12 is formed with a hole 12c that forms a part of the rear opening hole of the dust collection adapter unit 10, and the left head cover 13 is similarly formed with a hole 13c. Latch means 12a is formed near the upper portion of the right head cover 12, and a locking portion 13a (see FIG. 4) that engages with the latch means 12a is formed near the upper portion of the left head cover 13. A horizontal surface 13 f is formed on the upper side of the inner wall of the left head cover 13. The horizontal surface 13f is used to abut a later-described detent protrusion 21b (see FIG. 6) of the seal member 20.

  FIGS. 6A and 6B are views showing the appearance of the seal member 20, wherein FIG. 6A is a front view, FIG. 6B is a rear view, and FIG. As shown in (1), the sealing member 20 is formed by attaching an elastic member 22 to a steel plate 21 having a hole. The elastic member 22 is a single sheet, for example, a rubber sheet. A through hole 22a for penetrating the drill blade 2 is formed in the center of the elastic member 22, and eight cuts 22b are formed radially from the through hole 22a. An anti-rotation projection 21b and a stepped portion 21c are formed on the upper portion of the steel plate 21 as a portion that functions as an anti-rotation. The size of the through hole 22a is preferably substantially the same as or slightly smaller than the drill blade 2 to be mounted, and the drill blade 2 contacts the drill blade 2 rotating by deformation of each piece divided by the cut 22b. Air leakage from between the elastic members 22 is limited.

  FIG. 6 (2) is a rear view of the seal member 20, and an elastic member 22 having the same outer shape as the steel plate 21 as viewed from the back is attached to the back side of the steel plate 21. The steel plate 21 has a so-called ring shape in which the basic shape of the outer diameter is circular and the through hole 21a is formed. The elastic member 22 has the same outer diameter as the steel plate 21, and a through hole 22a and a notch 22b are formed near the center. As can be understood from the drawing, the cut 22b does not continue from the through hole 22a to the outer peripheral edge, but is interrupted in the middle, so that the eight movable pieces partitioned by the cut 22b are unlikely to fall apart. Further, since the connected outer peripheral portions are attached to the steel plate 21, it is possible to make the seal member 20 relatively thin while securing the rigidity of the seal member 20 to some extent.

  FIG. 6 (3) is a side view of the seal member 20. In this embodiment, the sheet-like elastic member 22 is fixed by baking on the steel plate 21. However, the fixing method is not limited to baking, and any fixing method such as adhesion, fixing by screw tightening, and fixing by pressure bonding may be used. Alternatively, both the elastic member 22 and the steel plate 21 may be manufactured by integral molding. Furthermore, the steel plate 21 is not necessarily made of metal, and may be a thin plate made of synthetic resin or other material as long as the required rigidity can be ensured.

  FIG. 7 is a front view of the dust cover 11. The dust suction cover 11 penetrates the drill blade 2 and forms a through passage that becomes a space for collecting dust. The through-passage is a space that opens to the work material side at the front by the opening 11c, is partitioned by the seal member 20 at the rear, and is defined by the dust cover 11 at the side in the circumferential direction. A through hole 11h is formed in the dust cover 11 and a radial cut 11i is formed from the through hole 11h. The through hole 11 h is formed larger than the through hole 22 a of the seal member 20, and is preferably formed larger than the drill blade 2. An air outlet 11a is formed in the upper part of the dust cover 11, and a blow-out passage is formed in the dust cover 11 so that air for blowing flows in the direction of the arrow indicated by the dotted line, although not shown. A suction port 11b (see FIG. 4) is formed below the center of the through passage of the dust cover 11. The dust cover 11 is further formed with a protrusion 11d and a step 11e.

  FIG. 8 is a cross-sectional view showing a state of the dust collection adapter unit 10 during the drilling operation. In FIG. 8, the drill blade 2 is pressed against the work material 3 to perform a drilling operation. When the drilling operation is completed and the operator pulls the drilling machine 1 toward the front, the dust collecting adapter unit 10 is moved against the drill blade 2. Therefore, the elastic member 21 of the seal member 20 is bent rearward as shown in the figure. In this case, the sealing member 20 is subjected to a force pulled backward, but is held by the head cover portions (12, 13) by the steel plate 21, so that the sealing member 20 is not likely to drop off. Further, even when the drill blade 2 is rotated or reversely rotated, since the integrally formed steel plate 21 is held by the dust cover 11, the seal member 20 is caught in the rotation of the drill blade 2 and does not fall off. The dust generated during the drilling operation is prevented from falling to the outside on the rear side of the dust collection adapter portion 10 by the seal member 20, and is favorably guided to the dust collection passage 8a in the connection member 14.

  According to the present embodiment, since only the thickness W1 in the axial direction required for the installation of the seal member 20 is sufficient, the overall thickness W of the dust collection adapter portion 10 can be reduced while realizing high rigidity. For this reason, the effective cutting depth by a drill blade can be ensured largely, and an easy-to-use drilling machine can be realized. Further, during the cutting operation, there is a work material on the front side of the dust cover 11 and it is pushed from the rear side by the head cover parts (12, 13), so that the seal member 20 held between them is not removed. , Dust leakage can be effectively prevented.

  Next, the structure of the seal member 70 according to the second embodiment of the present invention will be described. 10A and 10B are views showing the appearance of the seal member 70, where FIG. 10A is a front view, FIG. 10B is a rear view, and FIG. 10C is a cross-sectional view taken along the line BB in FIG. As shown to (1), the sealing member 70 joins the elastic member 72 to the steel plate 21 with the through-hole 21a opened. The steel plate 21 is the same as that of the first embodiment, and an anti-rotation protrusion 21b serving as an anti-rotation is formed on the upper portion, and a step portion 21c is formed on the lower portion. The elastic member 72 is a single sheet, for example, a rubber member. A substantially circular through hole 72a for penetrating the drill blade 2 is formed in the center of the elastic member 72, and 16 cuts 72b are formed radially from the through hole 72a. Sixteen pleats 72c extending from the outer peripheral side to the inner peripheral side are formed by the cuts 72b. The through hole 72a is configured to be substantially circular by aligning the distal end portion of the pleat portion 72c in the circumferential direction, but has a jagged inner peripheral shape. The outer edge of each pleat 72c divided by the notch 72b is edged or chamfered to have a certain curvature. This is because there is a large reason why the elastic member 72 is formed by using the die-cutting method, and it is necessary to adopt such a chamfered pleat portion 72c. A favorable result is brought about in terms of improvement in manufacturing cost, windproof efficiency, and durability of the member 70.

  In the second embodiment, since the outer edge of each pleat portion 72c has no right-angled portion and is edged so as to have a radius of curvature, the drill blade 2 is rotated during rotation, attachment, or removal of the drill blade 2 to be penetrated. Can be greatly reduced from being caught by the elastic member 72. Therefore, cutting the elastic member 72 at the blade portion of the drill blade 2 can be reduced, and the durability of the seal member 70 can be improved.

  FIG. 10B is a rear view of the seal member 70. When viewed from the back, the elastic member 72 having the same outer shape as the steel plate 21 is attached to the back side of the steel plate 21. FIG. The elastic member 72 has the same outer diameter as the steel plate 21, and a through hole 72a and a cut 72b are formed near the center. As can be understood from the drawing, the notches 72b are not formed continuously from the through hole 72a to the outer peripheral edge, but are interrupted in the middle, so that the 16 movable piece folds 72c defined by the notches 72b are formed. Hard to fall apart. Further, since the elastic member 72 is attached to the steel plate 21 in the connected outer peripheral portion, the seal member 70 can be formed relatively thin while securing the rigidity of the seal member 70 to some extent.

  In the first embodiment, a sheet-like elastic member 22 having only through-holes 21a is manufactured by a rubber baking method, and then a plurality of cuts 22b are made by making cuts (press cutting) at once with a blade mold or the like. Formed. However, in the second embodiment, when the sheet-like elastic member 72 is configured, not only the through hole 72a but also the notch 72b are configured by die cutting. FIG. 10 (3) is a cross-sectional view of the BB part of (2). Since the cut 72b is formed by die cutting using a rubber baking method, the outer edge 72d of each fold portion divided by the cut 72b of the elastic member 72 has a certain curvature. Such a shape largely depends on the shape of the die for die cutting, but the durability of the elastic member 72 can be improved by intentionally having a curvature. The cut 72b is preferably produced by die cutting so that it is completely separated by die cutting. However, even when the adjacent pleat portion 72c is connected immediately after production by a burr or the like, when the drill blade 2 is first penetrated. There is no problem if adjacent pleats 72c can be easily separated.

  Next, the manufacturing procedure of the sealing members 20 and 70 will be described using the schematic diagram of FIG. In FIG. 11 (1), the steel plate 21 is set in the direction of the arrow on a metal mold 81 that shapes the shape and thickness of the elastic member. The steel plate 21 to be set is formed into the shape shown in FIGS. 6 and 10 by press working or the like. At this time, it is preferable to apply an adhesive to the upper surface (adhesion surface) 21d of the steel plate 21 in order to improve the bonding with the rubber, since the adhesion effect can be improved. Next, as shown in FIG. 11 (2), another metal mold 82 is placed on top of the metal mold 81, and the internal space 83 formed by the two metal molds 81 and 82 is heated to become liquid. Inject rubber. The injection location, rubber temperature, injection pressure, and the like may be appropriately set using a known method, and thus description thereof is omitted. Since FIG. 11 is a schematic diagram showing an outline of the manufacturing method, the shape of the portion forming the metal molds 81 and 82 is not correctly illustrated.

  Thereafter, when the rubber cools and hardens into a sheet shape, the steel plate 21 and the elastic member (rubber) 22 are extracted from the metal dies 81 and 82. What was made in this way is a seal member 20 shown in FIG. Thus, the seal member 20 or 70 can be easily manufactured by a so-called rubber baking method. Further, according to this manufacturing method, by appropriately setting the shapes of the metal dies 81 and 82, it is possible to configure a through hole having an arbitrary shape in the elastic member 22 or 72, a cut in an arbitrary direction, or the like. In addition, the shape of the metal mold makes it easy to form a shape with a desired curvature instead of a square shape.

  As mentioned above, although demonstrated based on the Example which shows this invention, this invention is not limited to the above-mentioned Example, A various change is possible within the range which does not deviate from the meaning. For example, in the above-described embodiments, the dust collecting apparatus having both the dust collecting passage 8 and the blowing passage 9 has been described. However, the dust collecting apparatus having only the dust collecting passage 8 without the blowing passage 9 and the blowing passage. The present invention can be similarly applied to only nine spraying apparatuses.

DESCRIPTION OF SYMBOLS 1 Drilling machine 2 Drill blade 3 Main body housing 3a Handle part 4 Trigger switch 5 Power cord 6 Tool holding part
8, 8a Dust collection passage 9, 9a Outlet passage 10 Dust collection adapter portion 11 Dust collection cover 11a Blowout port 11b Suction port 11c Opening portion 11d Projection portion 11e Stepped portion 11f Outer frame portion 11g Rear surface 11h Through hole 11i Incision 12 Right head cover 12a, 12b Latch means 12c Hole 13 Left side head cover 13a Locking part 13b Latch means
13c Hole portion 13d Opening portion 13e Groove portion 13f Horizontal surface 13f Plane portion 14 Connection member 14a Locking portion 14b Protruding portion 14c Outer peripheral side rib 14d Inner peripheral side rib 14e Recessed portion 18 Work material 20 Seal member 21 Steel plate 21a Through hole 21b Anti-rotation projection 21c Stepped portion 21d Adhesion surface 22 Elastic member 22a Through hole 22b Cut 31 Motor 31a Rotor 31b Stator 32 Cooling fan 33 Dust collecting fan 34 Pinion 35 Crankshaft 36 Cylinder 37 Metal bearing 38 Piston 39 Strike element 40 Connecting rod 41 Intermediate element 42 Intermediate shaft 43 Crank pin 44 Ball bearing 50 Slider part 51 Outer movable pipe 52 Outer fixed pipe part 53 Inner movable pipe 54 Inner fixed pipe 55 Spring 56 Dust collection case 57 Dust collection filter 58 Air passage 70 Seal member 72 Elastic member 72a Through hole 72b Incision 72c Fold portion 72d Outer edge 81, 82 Metal type 83 Space 110 Dust collection adapter portion 111 Opening portion 112 Connection member 112a Rib 112b Dust collection passage 112c Opening portion 120 Seal member 120a Through Hole 120b Folded part

Claims (11)

In a drilling machine having a driving source, a transmission driving unit that transmits a rotational force of the driving source to drive a tip tool, and a dust collecting device that sucks dust generated from a work material drilled by the tip tool,
The dust collecting device is provided with a dust collection adapter having a through passage for penetrating the tip tool and a suction port for sucking dust formed in the through passage,
Provided on the transmission drive part side of the through passage is a seal member having a through hole through which the tip tool penetrates and a plurality of cuts from the through hole,
A punching machine having a dust collecting device, wherein the sealing member is composed of a rigid member and an elastic member fixed to the rigid member.   The perforator having a dust collector according to claim 1, wherein the rigid member is a ring-shaped member, and the elastic member is a sheet-like member. The elastic member is a sheet-like member formed with the through hole and the plurality of cuts,
The punching machine having a dust collecting device according to claim 2, wherein the elastic member is fixed to the ring-shaped member in a region other than the region having the through hole and the notch. The elastic member is a sheet-like member in which the through hole and the cut are formed by die cutting, and the outer edge of the fold defined by the cut is trimmed to have a certain curvature,
The punching machine having a dust collecting device according to claim 2, wherein the elastic member is fixed to the ring-shaped member in a region other than the region having the through hole and the notch.   5. The punch having a dust collector according to claim 4, wherein the shape of the through hole is a substantially circular hole having an axial cross-sectional shape defined by a tip shape of the pleat portion. .   The punching machine having a dust collecting device according to any one of claims 1 to 5, wherein the elastic member is fixed to the rigid member by adhesion or baking.   The said elastic member is manufactured by integral molding with the said rigid member, The piercing machine which has a dust collector as described in any one of Claims 1-3 characterized by the above-mentioned.   The said sealing member is hold | maintained by the structural member of the said dust collection adapter so that it may be pinched | interposed from the front-back direction of the axial direction of the said front tool. Drilling machine with a dust collector. The dust collecting adapter is
The dust collection according to claim 8, wherein the seal member and a covering member that defines the through passage are attached to the head cover having a cup shape opened to the work material side from the work material side. Drilling machine with apparatus.   The anti-rotation portion is formed on the seal member, and the anti-rotation portion abuts against an inner wall of the head cover, thereby preventing the seal member from moving in the rotation direction. Drilling machine with a dust collector.   11. The dust collecting device according to claim 10, wherein the cover member is made of an elastic synthetic resin, and the cover member forms the through passage and the suction port that opens into the through passage. Drilling machine with apparatus.

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