JP2008149432A - Auxiliary tool for boring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an auxiliary tool for boring, which is available when mounted on a hand-held boring tool, and can prevent delamination occurring during boring work. <P>SOLUTION: The auxiliary tool 10 for boring is formed of: a tool fixing portion 12 which can be fixed to an angle-type hand drill 1; two guide rods 14 which are slidably supported by the tool fixing portion 12, and extend almost in parallel with a rotation axis of a drill T mounted on the angle-type hand drill 1; an abutting plate 16 fixed to a distal end of the guide rod 14; an anti-skid member 18 which is arranged on a front end face of the abutting plate 16; and dampers 20 which are arranged on the guide rods 14, for preventing the guide rods 14 from sharply sliding with respect to the tool fixing portion 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an auxiliary tool for drilling that is used by being attached to a hand-held drilling tool during a drilling operation or the like.

  Conventionally, fiber reinforced resin using glass fiber, carbon fiber, or the like has been used where appropriate in various fields, not limited to the field of transportation such as aircraft, railways, and automobiles. In particular, when holes for assembly or the like are drilled using a hand-held drilling tool such as a hand drill on a workpiece made of carbon fiber reinforced resin, an operator applies a predetermined load to the drill as a cutting tool. However, the moment the drill penetrates the workpiece, the reaction force from the workpiece to the load decreases, so the drill feed rate becomes extremely fast and delamination (delamination) occurs on the hole exit side. ) Occurred and caused a problem.

  Therefore, delamination is prevented by using a contact plate or the like on the side where the hole is removed. Alternatively, by using a NC NC machine tool that can be numerically controlled instead of a hand-held drilling tool, the hole is drilled while controlling the feed rate of the drill to prevent delamination.

  By the way, in the hand-held drilling tool, since the operator works by hand, there is a problem in that the position of the hole to be drilled and the angle of the hole are misaligned. For this reason, as shown in Patent Document 1 and Patent Document 2, A tool fixing portion that is fixed to the tool, a plurality of guide rods extending from the tool fixing portion, a contact plate that connects the tip ends of the guide rods, and a spring that biases the tool fixing portion and the contact plate in directions away from each other A drilling auxiliary tool equipped with the above-mentioned is attached to a hand-held drilling tool to prevent deviation of the hole position and the hole angle.

Japanese Utility Model Publication No. 58-181409 Japanese Utility Model Publication No. 60-183107

  However, depending on the shape of the workpiece and the position where the hole is to be drilled, NC machine tools cannot be used for drilling. Therefore, a hand-held drilling tool must be used, and the operator can practice and feed the drill with skill. It was impossible to control, and delamination could not be prevented.

  In addition, when the conventional drilling auxiliary tools shown in Patent Document 1 and Patent Document 2 are used, the tool fixing portion to which the handheld drilling tool is fixed is biased in a direction away from the contact plate by a spring. However, with a spring, the feed rate of the drill could not be adjusted, and delamination could not be prevented. Also, in order to drill a hole, it is necessary to apply a load to the drill against the biasing force of the spring, and a larger load must be applied to the hand-held drilling tool. If the reaction force from the drill becomes small, the feed rate of the drill will increase at the same time, causing delamination, or the chuck of the hand-held drilling tool that holds the drill may hit the surface of the workpiece and scratch it. There is a problem.

  Therefore, in view of the above situation, the present invention has an object to provide a drilling auxiliary tool that can be prevented from causing delamination during a drilling operation by being mounted on a hand-held drilling tool. is there.

  The drilling auxiliary tool according to the present invention includes a “tool fixing part that can be detachably fixed to a hand-held drilling tool, and a tool tool that is slidably supported by the tool fixing part. At least one guide rod extending substantially parallel to the shaft, a contact plate fixed to the tip of the guide rod, a non-slip member provided on the tip surface side of the contact plate, and at least one of the guide rods And a damper that suppresses abrupt sliding of the guide rod with the tool fixing portion ”.

  Here, as the “hand-held drilling tool”, a main body having a chuck for holding a cutting tool such as a drill, a driving unit for rotating the chuck, and a gripping unit that holds the driving unit and can be gripped by an operator. A fluid actuator using a pressurized fluid such as compressed air, an electric motor, or the like can be used as the drive unit. The hand-held drilling tool may be a straight type in which the directions of the rotation axis of the drive unit and the cutting tool are substantially the same, or an angle type in which the directions of the rotation axis of the drive unit and the cutting tool are substantially orthogonal. There may be.

  In addition, as the “contact plate”, “a rectangular shape having a penetrating portion through which a cutting tool can pass”, “an L-shaped shape”, “an annular shape”, “a frame shape” , Etc. can be illustrated. As the “non-slip member”, “rubber”, “silicon”, “foamed resin”, and the like can be used.

  Furthermore, examples of the “damper” include “hydraulic damper”, “air damper”, and the like. In addition, it is desirable to use one provided with a speed adjustment mechanism that can adjust the relative movement speed between the guide rod and the tool fixing portion by changing the resistance of the fluid used in the damper.

  According to the present invention, the drilling auxiliary tool has a tool fixing portion that can be fixed to a hand-held drilling tool, and is supported by the tool fixing portion so as to be slidable, and extends at least one of the rotation axis of a cutting tool such as a drill. A guide plate, an abutting plate fixed to the tip of the guide rod, a non-slip member provided on the tip surface side of the abutting plate, and at least one guide rod slides rapidly between the tool fixing portion And a damper that suppresses this.

  Thereby, in a state where the tool fixing portion of the auxiliary tool for drilling is fixed at a predetermined position of the hand-held drilling tool so that the contact plate comes in front of a cutting tool such as a drill attached to the hand-held drilling tool, The contact plate is brought into contact with the surface of the workpiece via a non-slip member, and the cutting tool is positioned at a position where the workpiece is drilled. After the cutting tool is rotated at a predetermined speed, the hand-held drilling tool is moved toward the workpiece. When the cutting tool is pressed and moved in the direction of the workpiece and the cutting tool comes into contact with the workpiece, a hole is drilled at a predetermined position of the workpiece. At that time, the cutting tool moves straight along the rotation axis by the guide rod slidably supported by the tool fixing portion, and the cutting tool moves at a substantially constant speed by the damper, and the cutting tool penetrates the workpiece. Even when the reaction force from the workpiece is reduced, the movement speed of the cutting tool can be prevented from changing suddenly by the damper, so that delamination is prevented during drilling operations. be able to.

  Also, by attaching a drilling auxiliary tool to a hand-held drilling tool, it is possible to easily drill a good hole without delamination even by a manual operation by an operator, and therefore it cannot be processed by an NC machine tool or the like. A favorable hole can be drilled even at a location, and it is possible to easily cope with a workpiece having a more complicated shape.

  Furthermore, since a good hole without delamination can be easily drilled simply by attaching a drilling auxiliary tool to a hand-held drilling tool, even an unskilled worker can easily drill a good hole. It is possible to reduce the cost for the drilling operation.

  In addition, when drilling a hole in a workpiece, the number of rotations of a cutting tool such as a drill attached to a hand-held drilling tool can be drilled by contacting the workpiece after reaching a predetermined number of rotations. It is possible to prevent delamination from occurring on the front side.

  Furthermore, since the cutting tool of the hand-held drilling tool can be moved along the direction of the rotation axis by the guide rod, the cutting tool can be reliably fed straight in the direction of the rotation axis, and the angle of the hole to be drilled It is possible to prevent misalignment or the cutting tool blurring and expanding the diameter of the hole.

  In addition, since the non-slip member is provided on the contact surface of the contact plate, it is possible to prevent the contact plate from sliding against the surface of the work, and the contact plate slips during the drilling operation. The position of the hole to be drilled can be prevented from shifting, and the hole can be reliably drilled at a predetermined position.

  In addition, as a structure for supporting the guide rod slidably on the tool fixing portion, a guide hole through which the guide rod can be inserted may be formed in the tool fixing portion and directly supported, or the guide hole is formed. You may make it support indirectly through a slide block, the damper etc. which hold | maintain a guide rod so that sliding is possible.

  In addition, the number of guide rods may be one or plural, and when one guide rod is used, the number of parts constituting the drilling auxiliary tool can be reduced as much as possible, so that the cost can be reduced. Can be reduced. In addition, when a plurality of guide rods are used, the tool fixing portion can be supported with respect to the workpiece at a plurality of positions via the contact plate, so that the tool fixing portion can be prevented from shaking with respect to the workpiece. it can.

  In addition to the above configuration, the auxiliary tool for drilling according to the present invention is characterized in that “the tool fixing portion can support the guide rod at a predetermined position around the rotation axis of the cutting tool in the hand-held drilling tool”. And

  Here, the “predetermined position around the rotation axis” means a support portion for supporting the guide rod at every predetermined angle (for example, 45 °, 60 °, 90 °, etc.) with respect to the rotation axis of the cutting tool. And a guide rod is supported on any one of the support portions.

  According to the present invention, the guide rod can be supported at a predetermined position with respect to the rotation axis of the cutting tool attached to the hand-held drilling tool on the tool fixing portion. As a result, the position where the guide rod is supported with respect to the tool fixing portion can be changed as appropriate. Depending on the position where the hole is drilled in the workpiece, the hole is drilled at a desired position because the guide rod or damper becomes an obstacle. If this is not possible, by changing the position for supporting the guide rod to a position that does not interfere, a hole can be drilled at a desired position, and versatility can be further improved.

  It should be noted that the support of the guide rod, etc., to the tool fixing part should preferably be easy to attach and remove using bolts, locking claws, etc., thereby reducing the time required for the drilling operation. It is possible to prevent the work cost from increasing.

  In addition to the above-described configuration, the auxiliary tool for drilling according to the present invention is characterized in that “the contact plate has a through portion through which a cutting tool in a hand-held drilling tool can pass”. Here, examples of the “penetrating portion” include “a hole having an inner peripheral surface closed”, “a notch having an inner peripheral surface open to the outside”, and the like.

  According to the present invention, the contact plate is formed with a penetrating portion through which a cutting tool of a hand-held drilling tool can pass. As a result, the abutting plate can be brought into contact with the workpiece so as to surround the position where the hole of the workpiece is drilled, and the auxiliary tool for drilling can be stabilized, so that a favorable hole can be drilled.

  As described above, according to the present invention, it is possible to provide a drilling auxiliary tool that can be prevented from causing delamination during a drilling operation by being mounted on a hand-held drilling tool.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A drilling aid that is the best mode for carrying out the present invention will be described in detail below with reference to FIGS. FIG. 1 (A) is a perspective view showing the drilling aid according to the present invention mounted on a hand-held drilling tool, and FIG. 1 (B) is a perspective view showing the drilling aid of (A). 2 is a diagram showing a tool fixing portion of the drilling aid in FIG. 1, (a) is a front view, (b) is a plan view, (c) is a right side view, (d) is a bottom view, (E) is a rear view.

  As shown in the figure, the drilling auxiliary tool 10 of the present embodiment is slidable on the tool fixing part 12 and a tool fixing part 12 that can be detachably fixed to the angle-type hand drill 1 as a hand-held drilling tool. , Two guide rods 14 extending substantially parallel to the rotation axis of the drill T attached to the angle-type hand drill 1, a contact plate 16 fixed to the tip of the guide rod 14, and a tip of the contact plate 16 A non-slip member 18 made of a rubber plate or the like provided on the surface side, and a damper 20 provided on the two guide rods 14 for suppressing the guide rod 14 from sliding rapidly between the tool fixing portions 12 are provided. ing.

  As shown in FIG. 2, the tool fixing portion 12 in the auxiliary tool 10 for drilling has a vertically divided structure including an upper member 22 and a lower member 24, and the upper member 22 and the lower member 24 are separated from each other. The receiving recesses 26 that can receive the tips of the angle-type hand drills 1 are formed on the surfaces close to each other. After the tip of the angle-type hand drill 1 is received in the receiving recess 26, the upper member 22 and the lower member 24 are fastened with bolts 28 (see FIG. 1), so that the tool is attached to the tip of the angle-type hand drill 1. The fixing part 12 is fixed.

  A plurality of screw holes 32 for fixing the support block 30 that supports the damper 20 are provided on both side surfaces of the tool fixing portion 12 at a predetermined pitch, and the screw holes 32 for fixing the support block 30 are appropriately selected. Thus, the position where the support block 30, that is, the damper 20 is fixed can be changed back and forth or up and down.

  As shown in FIG. 1, the support block 30 has an arcuate pinching portion 34. After the two support blocks 30 are arranged so that the pinching portions 34 face each other, the pinching portions 34 are arranged. The damper 20 is disposed therein, the bolts 36 are passed through the two support blocks 30, screwed into the screw holes 32 of the tool fixing portion 12, and fastened, whereby the support block 30 is attached to the tool fixing portion 12. While being fixed, the damper 20 is clamped by the clamping part 34 of the support block 30, and the damper 20 is supported by the tool fixing part 12.

  In this example, the damper 20 is supported on both sides of the tool fixing portion 12 via the support block 30, and the axis of the damper 20, that is, the axis of the guide rod 14 is supported by the support block 30 on the angle-type hand. The damper 20 is supported by the tool fixing portion 12 so as to be substantially parallel to the rotation axis of the drill T attached to the drill 1.

  The damper 20 is a known hydraulic damper, and includes a cylindrical main body portion 38. Inside the main body portion 38, the guide rod 14 extends from one end portion (the lower end portion in this example). In this way, a speed adjustment knob 40 is provided at the other end (upper end in this example). By rotating the speed adjusting knob 40, the moving speed of the guide rod 14 held so as to be able to advance and retreat can be adjusted.

  As shown in FIG. 1, the contact plate 16 includes a fitting hole 42 that fits with the tip of the guide rod 14, a slit 44 that extends from the fitting hole 42 toward the side surface of the contact pot 16, and an angle-type hand. And a through portion 46 having a through hole through which a drill T attached to the drill 1 can pass. The two fitting holes 42 of the contact plate 16 are formed at the same pitch as the pitch of the guide rods 14 extending from the two dampers 20 supported by the tool fixing portion 12 via the support block 30.

  Screw holes and through holes 48 are coaxially formed on both sides of the slit 44 in the contact plate 16, and the bolts 50 are screwed into the screw holes through the through holes 48, so that the interval between the slits 44 is increased. The guide rod 14 fitted in the fitting hole 42 can be tightened to fix the guide rod 14 to the contact plate 16.

  Then, operation | movement of the auxiliary tool 10 for drilling of this embodiment is demonstrated. First, in a state where the angle type hand drill 1 is fixed to the tool fixing portion 12 of the drilling auxiliary tool 10, the non-slip member 18 is attached to the surface of a workpiece (not shown) (for example, a part made of carbon fiber reinforced resin such as an aircraft). The abutment plate 16 is abutted through and the drill T is positioned at a position where the workpiece is drilled, and the drill T is rotated by rotating the drill T at a predetermined speed and then pressing the angle type hand drill 1 toward the workpiece. Move in the direction of the workpiece.

  At that time, the drill T is moved straight along the rotation axis by the guide rod 14 slidably supported by the tool fixing portion 12 via the damper 20, and the drill T is moved at a substantially constant speed by the damper 20. Will be. When the drill T comes into contact with the workpiece, a hole is drilled at a predetermined position of the workpiece. Even when the reaction force from the workpiece decreases when the drill T penetrates the workpiece, the movement speed of the drill T is increased by the damper 20. Rapid changes are suppressed, and delamination can be prevented from occurring on the workpiece.

  Note that the drilling auxiliary tool 10 of this embodiment is used by being attached to the angle-type hand drill 1, so that the axial length (height) of the drill T in the drilling auxiliary tool 10 is as short as possible. In this way, the hole can be suitably drilled even in a portion having a narrow width or height in the workpiece. Further, by operating the speed adjusting knob 40, it is possible to adjust the feed speed of the drill T according to the diameter of the hole to be drilled, the material of the workpiece, and the like.

  Next, based on FIG.3 and FIG.4, the drilling auxiliary tool 60 of embodiment different from the above-mentioned drilling auxiliary tool 10 is demonstrated in detail. FIG. 3 is a perspective view showing a state in which a drilling auxiliary tool according to an embodiment different from that shown in FIG. 1 is mounted on a hand-held drilling tool. 4A and 4B are diagrams showing the drilling auxiliary tool of FIG. 3, wherein FIG. 4A is a perspective view showing a state in which the hand-held drilling tool in FIG. 3 is removed, and FIG. The perspective view which shows the state fixed to the side, and (C) are the perspective views which show the state which fixed the damper on the both sides of the tool fixing | fixed part. In addition, about the thing similar to what was shown in FIG.1 and FIG.2, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  As shown in FIG. 3, this drilling auxiliary tool 60 is mainly used by being attached to the straight type hand drill 2 as a hand-held drilling tool. Like the above-described drilling auxiliary tool 10, a straight type hand is used. A tool fixing portion 62 that can be fixed to the drill 2, two guide rods 14 that are slidably supported by the tool fixing portion 62 and extend substantially parallel to the rotation axis of the drill T attached to the straight type hand drill 2, and a guide An L-shaped contact plate 64 fixed to the tip of the rod 14, a non-slip member 18 provided on the tip surface side of the contact plate 64, and a damper 20 provided on one guide rod 14 are provided. Yes.

  As shown in FIG. 4, the tool fixing portion 62 has a substantially rectangular shape in plan view, and a fixing hole 66 for fixing the straight type hand drill 2 formed in the center thereof, and the fixing hole 66 to one side surface. A slit 68 to be removed and a screw hole 70 formed at a predetermined pitch on a side surface other than the one side surface on which the slit 68 is formed are provided. Although not shown, screw holes and through holes are coaxially formed on both sides of the slit 68, and bolts are screwed into the screw holes and fastened to fasten the fixing holes 66. The part of the inserted straight type hand drill 2 is tightened so that the tool fixing portion 62 can be fixed to the straight type hand drill 2. Further, the diameter of the fixing hole 66 can be appropriately selected depending on the diameter of the fixed portion of the straight type hand drill 2 to be mounted and fixed.

  The support block 72 that supports the damper 20 and the slide block 74 that slidably supports the guide rod 14 can be fixed to the side surface of the tool fixing portion 62 by screwing the bolt 36 into the screw hole 70. When the side on which the slit 68 is formed with respect to the fixed hole 66 is the worker side, the state of FIG. 3 is the support block on the right side (left side in the figure) from the worker side. 72, a sliding block 74 is fixed on the back side (the front side in the figure) from the worker side.

  The support block 72 includes two through holes 76 through which the bolts 36 pass, an insertion hole 78 through which the damper 20 can be inserted, and a slit 80 that extends from the insertion hole 78 to the side so as to cross one through hole 76. Yes. While the damper 20 is inserted through the insertion hole 78, the bolt 36 is fastened to the screw hole 70 through the through hole 76 traversed by the slit 80, whereby the damper 20 is fastened by the support block 72 and the damper 20 is fixedly supported. The support block 72 is fixed to the tool fixing portion 62.

  The sliding block 74 includes two through holes 82 through which the bolts 36 pass, and a guide hole 84 having a diameter that allows the guide rod 14 to slide. The pitch of the two through holes 76 and 82 of the support block 72 and the slide block 74 is the same as the pitch of the two screw holes 70 formed on each side surface of the tool fixing portion 62. The moving block 74 can be fixed to any side surface of the tool fixing portion 62 where the screw hole 70 is formed.

  Also in this example, the support block 72 and the sliding block 74 can support the guide rod 14 so as to extend substantially parallel to the rotation axis of the drill T in the straight type hand drill 2 attached to the tool fixing portion 62. ing. In addition, the code | symbol 86 in FIG.4 (C) is a straight-shaped contact plate.

  The drilling auxiliary tool 60 of this embodiment also operates in the same manner as the above-described drilling auxiliary tool 10, so that the position at which the tool fixing portion 62 supports the guide rod 14 and the damper 20 can be appropriately changed. For example, when there is an obstacle on the left side from the worker side, the support block 72, the sliding block 74, and the contact plate 64 are in the state shown in FIGS. 3 and 4A. Assembling can facilitate the drilling operation. In addition, when there is an obstacle on the right side from the worker side, it is possible to facilitate the drilling work by assembling in a state as shown in FIG. Furthermore, when there is an obstacle on the back side from the worker side, the damper 20 is fixed to both side surfaces of the tool fixing portion 62 via the support blocks 72 as shown in FIG. When the straight contact plate 86 is attached to the distal end of the guide rod 14 extending from 20, the hole making operation can be facilitated.

  Further, as shown in FIGS. 4A and 4B, the guide rod 14 is supported by the sliding block 74 on the back side from the worker side without using the damper 20. The amount of protrusion from the fixing portion 62 is reduced so that drilling can be performed even in a narrow position.

  Thus, according to the drilling auxiliary tools 10 and 60 of the present embodiment, the drill T moves straight along the rotation axis by the guide rod 14 slidably supported by the tool fixing portions 12 and 62, and Since the drill T can be moved at a substantially constant speed by the damper 20, even when the reaction force from the work is reduced when the drill T penetrates the work, the movement speed of the drill T is rapidly changed by the damper 20. Can be suppressed, and delamination can be prevented from occurring during the drilling operation.

  Also, by attaching the drilling aids 10 and 60 to a hand-held drilling tool such as the angle-type hand drill 1 or the straight-type hand drill 2, it is possible to easily drill a good hole without delamination even by manual operation by an operator. Therefore, good holes can be drilled even in places that cannot be machined by NC machine tools, etc., and it is possible to easily cope with workpieces with more complex shapes. As a result, it is possible to easily drill a good hole without any skill, so that it is possible to easily punch a good hole and reduce the cost for the drilling operation.

  Furthermore, when drilling holes in the workpiece, the drill T can be drilled in contact with the workpiece after reaching a predetermined rotation speed, so that delamination occurs on the front side of the workpiece. Can be prevented. In addition, since the drill T can be moved along the direction of the rotation axis by the guide rod 14, the drill T can be surely sent straight in the direction of the rotation axis, and the angle of the hole to be drilled can be shifted, It is possible to prevent the cutting tool from blurring and expanding the diameter of the hole.

  Further, since the non-slip member 18 is provided on the contact surfaces of the contact plates 16, 64, 86, it is possible to prevent the contact plates 16, 64, 86 from sliding with respect to the surface of the workpiece. It is possible to prevent the contact plates 16, 64, and 86 from slipping during the opening operation to shift the position of the hole to be drilled, and to reliably drill the hole at a predetermined position.

  Furthermore, since the position where the guide rod 14 is supported with respect to the tool fixing portion 62 can be changed as appropriate, depending on the position where the hole is drilled in the workpiece, the guide rod 14 and the damper 20 may interfere with each other to a desired position. If the hole cannot be drilled, the hole for drilling can be drilled at a desired position of the workpiece by changing the position for supporting the guide rod 14 or the like to a position that does not interfere with the work, thereby improving versatility.

  Further, since the through portions 46 through which the drill T can pass are formed in the contact plates 16, 64, 86, the contact plates 16, 64, 86 are used as workpieces so as to surround the positions where the holes of the workpiece are drilled. It is possible to stabilize the perforating auxiliary tools 10 and 60 by abutting, and it is possible to perforate favorable holes.

  The present invention has been described with reference to preferred embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention as described below. And design changes are possible.

  That is, in this embodiment, although the hexagon socket head cap screw was shown as a bolt which fixes each member in the auxiliary tools 10 and 60 for drilling, it is not limited to this, Hex head bolt, butterfly head bolt, pan head Appropriate bolts such as bolts and countersunk head bolts can be used. For example, when the butterfly head bolt is used, the bolt can be rotated without a tool, and the position of the guide rod 14 and the damper 20 can be easily changed.

  In addition, in the drilling auxiliary tools 10 and 60 shown in FIGS. 1 and 4C, two (all) guide rods 14 are provided with the damper 20, but the invention is not limited to this. The damper 20 may be provided on only one guide rod 14, whereby the cost for the drilling auxiliary tools 10 and 60 can be reduced and the feed rate of the drill T can be easily adjusted. .

  Furthermore, although the hole-shaped thing which consists of a through-hole with which the inner peripheral surface was closed was shown as the penetration part 46 of contact plate 16,64,86, it is not limited to this, An inner peripheral surface is outside. It is good also as a notch shape open | released, and it can make it easy to see the hole position to pierce | drill.

(A) is a perspective view which shows the state which mounted | wore the handheld drilling tool with the drilling auxiliary tool which concerns on this invention, (B) is a perspective view which shows the auxiliary tool for drilling of (A). It is a figure which shows the tool fixing | fixed part of the auxiliary tool for drilling in FIG. 1, (a) is a front view, (b) is a top view, (c) is a right view, (d) is a bottom view, (e) is a figure. It is a rear view. It is a perspective view shown in the state where the auxiliary tool for drilling of the embodiment different from FIG. 1 was mounted on the hand-held drilling tool. It is a figure which shows the auxiliary tool for drilling of FIG. 3, (A) is a perspective view which shows the state which removed the hand-held drilling tool in FIG. 3, (B) fixed the damper on the opposite side with respect to (A). The perspective view which shows a state, and (C) are the perspective views which show the state which fixed the damper on the both sides of the tool fixing | fixed part.

Explanation of symbols

T drill (cutting tool)
1 Angle-type hand drill (hand-held drilling tool)
2 Straight-type hand drill (hand-held drilling tool)
10, 60 Auxiliary tool for drilling 12, 62 Tool fixing part 14 Guide rod 16, 64, 86 Abutting plate 18 Non-slip member 20 Damper 40 Speed adjustment knob 60 Auxiliary tool for drilling 62 Tool fixing part 64 Abutting plate

Claims (3)

A tool fixing part that can be detachably fixed to a hand-held drilling tool;
At least one guide rod that is slidably supported by the tool fixing portion and extends substantially parallel to the rotation axis of the cutting tool in the hand-held drilling tool;
A contact plate fixed to the tip of the guide rod;
A non-slip member provided on the tip surface side of the contact plate;
A drilling aid, comprising: a damper provided on at least one of the guide rods, and a damper that suppresses abrupt sliding of the guide rod with the tool fixing portion. The tool fixing part is
The drilling auxiliary tool according to claim 1, wherein the guide rod can be supported at a predetermined position around a rotation axis of the cutting tool in the hand-held drilling tool. The contact plate is
The drilling auxiliary tool according to claim 1 or 2, further comprising a penetrating portion through which a cutting tool in the hand-held drilling tool can pass.

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