JP2005081529A - Cutting head for cutting tapered bore and drill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting head for cutting a tapered bore capable of being attached on a portable drill so as to cope with a site, and capable of forming the tapered bore having a large diameter without the excessive producing cost. <P>SOLUTION: This cutting head for cutting the tapered bore is provided with a main shaft connected to a drive shaft, a needle fitted on a peripheral surface of the main shaft movably from a root side of the main shaft to a tip along a direction approaching an axis of the main shaft, a cutting tool protruding to a radial direction of the main shaft from the needle, and a movable means for moving the needle to the direction. The cut diameter of the cutting tool is reduced by the movement, and the cutting head for cutting the tapered bore is used for the drill. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cutting head and a drill for forming a tapered hole.

  A lathe is generally used for drilling to form a tapered hole. The lathe is equipped with a mechanism that changes the cutting diameter as the cutting blade advances. Not suitable for use for drilling purposes. If a cutting blade with a taper is used in advance, it can be mounted on a portable drill and ready to respond to the job site, but the formed taper hole is limited to a limited shape, and various types of cutting blades are prepared in advance. I have to keep it. Those having a large diameter have a high manufacturing cost of the drill, and it is further expensive to prepare a large number of cutting blades in advance. Also, for drilling that requires a hole saw type cutting blade, it is difficult to cut with a taper on the cutting blade.

A method of forming a tapered hole by press working is also disclosed (see, for example, Patent Document 1). However, the formed tapered hole is also limited to a limited shape and can be carried to a construction site. Therefore, it is not suitable for use for the purpose of immediately drilling according to the situation.
JP-A-8-150428 (Claims)

  In view of these problems, the present invention aims to provide a cutting head for cutting a tapered hole that can be mounted on a portable drill and can be quickly adapted to the site, and can form a tapered hole with a large diameter without increasing the manufacturing cost of the drill. . In addition, it is intended to provide a drill that can be adapted to the site and can form a tapered hole with a large diameter without increasing the manufacturing cost of the drill.

The gist of the present invention is that it is used by being attached to a drill drive unit including a bearing base and a drive shaft that is attached to the bearing base,
A main shaft that is connected to and driven by the drive shaft, and has a connecting portion for connection with the drive shaft;
A mover that is engaged with the peripheral surface portion of the tip portion of the main shaft so as to be movable in a direction from the base toward the tip of the main shaft and close to the axis of the main shaft,
A bit fixed to the mover and protruding in the radial direction of the main shaft;
Moving means for moving the mover in the direction,
The cutting tool is a taper hole cutting head in which the cutting tool is driven by the drive shaft through the main shaft and the cutting diameter of the cutting tool is reduced by the movement.

In the taper hole cutting head, the moving means is:
A housing that is fixed to the bearing base and includes a fixing connecting portion for fixing to the bearing base;
A movable body engaged with the housing so as to be movable in the axial direction of the main shaft;
A thrust bearing in which one movable ring is coupled to the movable body coaxially with the main shaft;
A thrust member coupled to the other bearing ring of the thrust bearing and movable in the axial direction;
The movable element may be pushed and moved in the direction through the thrust bearing and the thrust member by the movement of the movable body, and the cutting diameter of the cutting tool may be reduced by the movement.

  In the cutting head for cutting a tapered hole, the housing is cylindrical, the movable body is a cylindrical body, the housing is fixed to the bearing base coaxially with the axis of the main shaft, and one of the movable bodies. The other end of the movable body is coaxially coupled to the thrust bearing, and the movable body is twisted to move in the direction toward the tip. You can get none.

Further, the gist of the present invention is a drill including a main shaft for drilling,
A mover that engages with the peripheral surface portion of the tip portion of the main shaft so that the base of the main shaft moves from the end to the tip and is close to the axis,
A bit fixed to the mover and protruding in the radial direction of the main shaft;
Moving means for moving the mover in the direction,
It is a drill in which the cutting diameter of the cutting tool is reduced by the movement.

  According to the present invention, there is provided a cutting head for cutting a taper hole that can be mounted on a portable drill and can quickly adapt to the site, can form a large-diameter tapered hole, can be easily replaced, and does not have a high replacement blade cost. In addition, a drill is provided that can be adapted to the site and can form a tapered hole with a large diameter without increasing the manufacturing cost of the drill.

  The aspect which concerns on this invention is demonstrated in detail based on drawing. In addition, in this specification, the same code | symbol written over each figure shows the same or similar member and thing. FIG. 1 is a schematic cross-sectional view showing an embodiment of a cutting head 2 for cutting a tapered hole according to the present invention, and FIGS. 2 (a) to 2 (d) are AA, BB, CC and D in FIG. It is sectional drawing of a -D direction. As shown in FIGS. 1 and 2, the cutting head 2 for cutting a tapered hole according to the present invention includes a bearing base 4 of a drilling machine such as a portable drill using a hole saw and a drive shaft 6 that is attached to the bearing base 4. It is used by being attached to a drill drive unit 8 provided.

  The taper hole cutting head 2 is driven by being coaxially connected to the drive shaft 6 by a bolt 15 and driven by a main shaft 12 having a connecting portion 10 for connection to the drive shaft 6, and one end 16 on the bearing base 4. A cylindrical housing 20 having a fixed connecting portion 18 for fixing to the bearing base 4 is fixed, and one end 22 is engaged with the housing 20 so as to be movable in the direction of the axis 13 of the main shaft 12. The cylindrical movable body 26, a thrust bearing 34 in which one raceway ring 32 is coupled to the other end 30 of the cylindrical movable body 26 coaxially with the main shaft 12, and another raceway ring 36 of the thrust bearing 34 are provided. And a thrust member 38 that is movable in the direction of the shaft center 13, and further, on the peripheral surface portion of the lower end portion 40 of the main shaft 12, in a direction approaching the shaft center 13 from above to below. A mover 42 movably engaged; Configured to include a byte 44 that protrudes in the radial direction of the main shaft 12 is fixed to the Doko 42.

  In the description of the present specification, for convenience of description, with respect to the direction of the axis 13, the drive shaft 6 is also referred to as the upper side and the opposite side is also referred to as the lower side. Further, with respect to the direction of the axis 13, the surface on which the drive shaft 6 faces the flange is also referred to as the upper surface, and the surface on the opposite side facing the flange is also referred to as the lower surface. The upper end (part) is the upper end (part), the lower end (part) is the lower end (part), the upper edge (part) is the upper edge (part), and the lower edge (part) is the lower edge (part). Called.

  The cylindrical housing 20 and the cylindrical movable body 26 are both arranged coaxially with the direction of the axis 13, and the cylindrical movable body 26 is screwed upward into the cylindrical housing 20 at the screwing portion 48. Engage with each other.

  The mover 42 is formed of a long rectangular member, and the longitudinal groove 50 is formed on the peripheral surface of the main shaft 12 and extends substantially in the direction of the axis 13, and the longitudinal direction is the same as the longitudinal direction of the longitudinal groove 50. Are slidably fitted in the longitudinal direction. The longitudinal direction of the bottom surface 52 of the vertical groove 50 is inclined with respect to the direction of the axis 13 and the inclination angle α, and the vertical groove 50 is formed so that the bottom surface 52 approaches the axis 13 as it goes downward. ing.

  A pair of pressing plates 54 are provided at the opening edge of the vertical groove 50 so as to partially block the opening of the vertical groove 50 to prevent the movable element 42 from protruding from the vertical groove 50, and the main shaft 12 is secured by a fastening bolt 58. It is fixed. A long gap 62 through which the cutting tool 44 can pass is formed between the opposing edges of the pair of presser plates 54. The longitudinal direction of the gap 62 is parallel to the longitudinal direction of the longitudinal groove 50. Further, a bridging retainer plate 60 closes the opening of the vertical groove 50 and is bridged over the opposite edges of the vertical groove 50 so as to prevent the movable element 42 from protruding from the vertical groove 50. It is fixed by a set bolt 58. The bridge presser plate 60 and the presser plate 54 are arranged such that the upper side and the lower side are arranged with the cutting tool 44 in between.

  With this configuration, when the main shaft 12 is rotated by the drive shaft 6, the cutting tool 44 rotates about the axis 13 of the main shaft 12. With this configuration, the housing 20, the cylindrical movable body 26, the thrust bearing 34, and the thrust member 38 constitute the moving means 25 that pushes and moves the mover 42 downward. That is, when the cylindrical movable body 26 is swung by the screw motion and moved downward, the contact portion 29 located at the lower edge portion of the cylindrical movable body 26 contacts the thrust receiving surface 64 of the single race ring 32. Thus, the thrust bearing 34 is pushed downward. As a result, the thrust receiving surface 66 of the other race ring 36 pushes the upper surface of the thrust member 38 downward, and the lower surface of the contact portion 74 of the thrust member 38 pushes the upper surface 70 of the mover 42. Slides along the vertical groove 50 along the bottom surface 52 and moves downward. The contact portion 74 is arranged such that the tip is inserted into the vertical groove 50. By this movement of the mover 42, the distance between the cutting tool 44 and the shaft center 13 is reduced, the cutting diameter is gradually reduced, and the tapered hole is cut.

  The thrust member 38 is inserted from below into a hollow portion of a ring 33 that is fitted onto the other race ring 36 at an upper portion, and is locked by a retaining ring 57 that is fitted inside the ring 33.

  In the cutting head for cutting a tapered hole according to the present invention, a pair or three or more movable elements 42 (exchange tool jig 75) with a tool 44 are attached to the main shaft 12 symmetrically about the shaft center 13. May be. This embodiment is preferable because there is little shaft runout during drilling. In this case, the diameter of the main shaft 12 needs to be thick enough to attach a plurality of replacement tool jigs 75.

  FIG. 3 shows the shape of the movable element 42 and the cutting tool 44 fixed to the movable element 42. The mover 42 and the cutting tool 44 constitute an exchange tool jig 75. By exchanging the exchange tool jig 75, drilling with different diameters becomes possible. The exchange tool jig 75 is preferably used when a tapered hole is drilled after a pilot hole is made. FIG. 4 shows an embodiment of an exchange tool jig 75a provided with another tool tool 44a. The exchange tool jig 75a is preferably used when a tapered hole is drilled without a pilot hole.

  According to the cutting head 2 for cutting a tapered hole of the present invention, a taper hole having a large diameter of, for example, 2.5 cm or more can be drilled by a simple operation by attaching it to a drilling machine such as a portable drill. . That is, a simple operation of turning a lever 77 extending from the cylindrical movable body 26 in a direction orthogonal to the direction of the main shaft 12 in the circumferential direction of the cylindrical movable body 26 during the drilling operation causes the cylindrical movable body 26 to be moved by a spiral motion. The taper hole is cut by lowering and pushing the replacement tool jig 75 downward through the thrust bearing 34.

  In the present invention, the lowering of the movable body does not have to be performed by a spiral motion. 6 (a), 6 (b), and 6 (c), which are cross-sectional views in the EE direction, the FF direction, and the GG direction in FIGS. ). 5 and 6, the cutting head 2a for taper hole cutting includes a station 20a in which the bearing base 4 is provided with a fixing connecting portion 18a for fixing to the bearing base 4, and a movable body 26a that engages with the station 20a. And an extruding lever 84 provided at the tip thereof with a pressing element 82 that abuts against the pressed surface 80 of the movable body 26a and pushes the movable body 26a downward.

  The station 20a includes a ring portion 90 that is externally fitted to the bearing base 4 and is fixed by a retaining bolt 86, a guide member 92 that is fixed to the peripheral surface of the ring portion 90 and has a through hole 94 in the vertical direction, and a ring portion. A bearing arm member 98 which is fixed to 90 via a guide member 92 and hangs down.

  The movable body 26a is looped in an annular shape, the upper surface of one race ring 32 is brought into contact with the lower surface of the step 102 formed by the loop, and the upper surface is pressed. A fitting ring 100 which is a contact surface 80, a receiving portion 104 fixed to the peripheral surface of the fitting ring 100, and a slide rod 106 which extends upward from the receiving portion 104 and is inserted into the through hole 94. Is done. The slide bar 106 is guided by the guide member 92 and can be moved up and down, whereby the movable body 26a can be moved up and down.

  On the other hand, the pushing lever 84 is pivotally attached to the fulcrum portion 110 via the bearing arm member 98 and the shaft 112. The shaft 112 has an axis that is orthogonal to the vertical direction. By pushing the force point portion 114 of the pushing lever 84 upward, the pressing element 82 provided on the action point portion 116 of the pushing lever 84 pushes the movable body 26a downward. The pushing lever 84 has a bifurcated branching point 116 and a pressing element 82 at each of the branched ends.

  A pair of exchange tool jigs 75, 75 are attached to the main shaft 12a in the same manner as shown in FIGS. 1 and 2 at lower positions corresponding to the pressing elements 82, 82, respectively. The thrust member 38a includes a contact portion (not shown) that is axially symmetric corresponding to each of the pair of vertical grooves 50.

  With this configuration, the station 20a, the movable body 26a, the pushing lever 84, the thrust bearing 34, and the thrust member 38 constitute moving means 25a that pushes and moves the mover 42 downward.

  In the cutting head 2a for taper hole cutting, the station 20a may be fixed to a fixed base (not shown) provided separately from the bearing base 4.

  In the present invention, the taper hole cutting head 2 or the taper hole cutting head 2a and the drill drive unit 8 are combined to form the drill 1 (FIG. 1) and the drill 1a (FIG. 4). In this case, the connection between the bearing base 4 and the housing 20 or the station 20a is not necessarily easy to attach and detach, and the structure of the taper hole cutting head 2a or the taper hole cutting head 2a is completed as a drill component in advance. A drill incorporated as

  The embodiments of the cutting head for drilling a tapered hole and the drill according to the present invention have been described above. All of these embodiments are within the scope of the present invention.

  The cutting head for taper hole cutting according to the present invention is mounted on the driving unit of a conventional drilling machine and can be operated by a simple operation at a construction site, particularly an outdoor construction site, and is not bulky. It can be suitably applied to. Besides, it can be widely applied to drilling of water pipes, gas pipes and other wall surfaces that require taper hole cutting. The cutting head for cutting a tapered hole according to the present invention can be applied not only to a metal pipe but also to a resin pipe such as a vinyl chloride pipe. It is also suitably used for drilling metal plates and resin plates.

  The drill of the present invention is mounted on the drive unit of a conventional drilling machine and can be operated by a simple operation at a construction site, and is not bulky, and thus can be suitably applied to unreserved water construction of distribution pipes. Besides, it can be widely applied to drilling of water pipes, gas pipes and other wall surfaces that require taper hole cutting. The drill of the present invention can be applied not only to a metal pipe but also to a resin pipe such as a vinyl chloride pipe. It is also suitably used for drilling metal plates and resin plates.

It is sectional drawing which shows an example of the aspect of the cutting head for taper hole cutting of this invention. 2A to 2D are cross-sectional views in the AA, BB, CC, and DD directions of FIG. 1, respectively. FIG. 3A is a side view, and FIG. 3B is a front view, illustrating a configuration of an exchange tool used in a cutting head for cutting a tapered hole according to the present invention. FIG. 4A is a side view, and FIG. 4B is a front view, illustrating a configuration of another exchange tool used for the cutting head for cutting a tapered hole of the present invention. It is sectional drawing which shows another example of the aspect of the cutting head for taper hole cutting of this invention. 6A to 6C are cross-sectional views in the EE direction, the FF direction, and the GG direction, respectively, in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a: Drill 2: Cutting head for taper hole cutting 2a: Cutting head for taper hole cutting 4: Bearing base 6: Drive shaft 8: Drill drive part 10: Connection part 12: Main shaft 13: Shaft center 18: Connection for fixation Portion 20: Housing 20a: Station 25, 25a: Moving means 26: Cylindrical movable body 26a: Movable body 32: One race ring 34: Thrust bearing 36: Other race ring 38, 38a: Thrust member 42: Movable element 44 : Byte 48: Threaded portion 50: Vertical groove 84: Extrusion lever

Claims (4)

It is used by being attached to a drill drive unit comprising a bearing base and a drive shaft that is pivotally attached to the bearing base,
A main shaft that is connected to and driven by the drive shaft, and has a connecting portion for connection with the drive shaft;
A mover that is engaged with the peripheral surface portion of the tip portion of the main shaft so as to be movable in a direction from the base toward the tip of the main shaft and close to the axis of the main shaft,
A bit fixed to the mover and protruding in the radial direction of the main shaft;
Moving means for moving the mover in the direction,
A cutting head for cutting a tapered hole, wherein the cutting tool is driven by the driving shaft through the main shaft, and the cutting diameter of the cutting tool is reduced by the movement. The moving means is
A housing that is fixed to the bearing base and includes a fixing connecting portion for fixing to the bearing base;
A movable body engaged with the housing so as to be movable in the axial direction of the main shaft;
A thrust bearing in which one movable ring is coupled to the movable body coaxially with the main shaft;
A thrust member coupled to the other bearing ring of the thrust bearing and movable in the axial direction;
The mover is pushed and moved in the direction through the thrust bearing and the thrust member by the movement of the movable body, and the cutting diameter of the cutting tool is reduced by the movement. The cutting head for taper hole cutting described. The housing is cylindrical, the movable body is a cylindrical body, the housing is fixed to the bearing base coaxially with the axis of the main shaft, and one end of the movable body is screwed coaxially with the housing. The tapered hole according to claim 2, wherein the other end of the movable body is coaxially coupled to the thrust bearing, and the movable body is twisted to move in a direction toward the tip. Cutting head for cutting. A drill having a drilling spindle,
A mover that engages with the peripheral surface portion of the tip portion of the main shaft so that the base of the main shaft moves from the end to the tip and is close to the axis,
A bit fixed to the mover and protruding in the radial direction of the main shaft;
Moving means for moving the mover in the direction,
A drill in which the cutting diameter of the cutting tool is reduced by the movement.

Images