JP4634484B2 - Existing hole diameter expansion tool - Google Patents

Description

  The present invention relates to a diameter expanding tool for an existing hole used for expanding the diameter of a circular existing hole provided in advance in a plate-like portion.

  For example, in an electrical installation device formed using a metal plate or the like, a circular hole having a design dimension is previously drilled for drawing out wiring cords.

  By the way, in wiring work at the installation site, when the wiring cords are bundled and pulled out from the circular hole, the bundled diameter of the wiring cords becomes thicker than the circular hole and often cannot be pulled out from the circular hole. In such a case, it is necessary to expand the diameter of the circular hole.

  Conventionally, in order to expand the diameter of an existing circular hole provided in a metal plate or the like, a tapered hole saw is used, which is attached to the rotary shaft of a rotary tool, and the hole saw is rotated at a high speed and pushed into the circular hole. Thus, the inner diameter of the circular hole is cut to increase the diameter.

  By the way, the tapered hole saw diameter has a relatively narrow cutting range, and the diameter of the existing circular hole varies.Therefore, a wide variety of tapered hole saws with different diameters are prepared for the hole diameter. There is an inconvenience of having to deal with the difference between the circular holes.

  In addition, the diameter of the circular hole by the reamer cuts the inner periphery of the circular hole all at once, so it is difficult to adjust the amount of cutting, and the state of excessive cutting is inevitably generated. Since the taper surface is used for cutting, the inner peripheral surface after cutting becomes an acute angle like a blade on the small diameter side, and there is a risk of causing damage to the cable passed through the circular hole.

  Thus, the problem of the present invention is that it can widely correspond to different diameters of the existing circular holes, can easily adjust the cutting amount, can be expanded to the required diameter, An object of the present invention is to provide a tool for expanding a diameter of an existing hole that can be cut so that an acute angle does not occur on an inner peripheral surface.

  In order to solve the above-described problems, the present invention provides a tool groove in which a groove groove is provided around a tool base to be engaged with an inner peripheral edge of an existing hole that is a diameter expansion screw, and the existing hole is formed by rotation. A rotation input shaft having a cutting tool for cutting the inner peripheral edge of the rotation input shaft is provided in a parallel arrangement, and either one of the profile groove wheel and the rotation input shaft can move in a direction in which the rotation input shaft approaches and separates from the other. Thus, a configuration is adopted in which the tool is held by the tool base and the moving elasticity in a direction in which the tool base is always separated from the other is urged.

  A groove wheel that follows the one end side of the tool base is attached so as to protrude to one surface side of the tool base in an arrangement perpendicular to the length direction of the tool base, and the length of the tool base is extended to the other end of the base. A rotary input shaft that can move along the provided long hole is mounted, a blade is provided on a portion of the rotary input shaft that protrudes on one side of the tool base, and a spring incorporated in the tool base is used to rotate the rotary input shaft. The moving elasticity in the direction that always moves away from the grooved wheel can be configured to be biased.

  Here, the tool base is formed in a box shape that is an internal hollow rectangle made up of the front wall, the rear wall, and the peripheral wall facing each other, and projects forward from the front wall to one end side in the length direction of the tool base. A scanning shaft is fixed, and a scanning groove is rotatably attached to the scanning shaft. A long hole is formed in the front wall and the rear wall in a range from the other end side of the tool base to the scanning shaft along the length direction. The rotary input shaft penetrating both elongated holes is rotatably supported by a moving member and a bearing that are incorporated in the tool base so as to be movable in the length direction, and is incorporated in the tool base. The spring urges the rotational input shaft via the moving member to move elastically in a direction that is always away from the scanning shaft.

The rotary input shaft is provided with a blade at the tip protruding from the front wall, the scanning shaft and the rotational input shaft are arranged in a parallel state, and the concave groove of the scanning groove wheel attached to the scanning shaft and the blade of the rotary input shaft are The blade is provided at a position at an equal distance from the front side of the tool base, and the blade is formed by providing a large number of cutting edges around the front and rear flanges, and the periphery of the existing hole is cut by rotation.
To increase the diameter of the existing hole, with the rotary input shaft pressed and moved closer to the profile groove side, the profile wheel and the rotation input shaft are inserted from one side into the existing hole, and the concave groove of the profile groove wheel is inserted. Is engaged with the inner periphery of the existing hole, and in this state, when the pressure of the rotary input shaft is released, the rotary input shaft is separated from the copying shaft, so that the blade is pressed against the inner periphery of the existing hole.

  The copying groove wheel and the blade are pressed against the positions on both sides of the shaft center at the inner peripheral edge of the existing hole by the elasticity of the spring, and in this state, a rotary drive is connected to the rear end of the rotary input shaft. When rotation is applied to the blade, the blade cuts the pressure contact portion of the inner periphery of the existing hole by rotation, and when the rotary input shaft is moved in the circumferential direction of the existing hole, the blade revolves while sequentially cutting the inner periphery of the existing hole. Then, the inner peripheral length of the existing hole is cut by a predetermined amount by one revolution of the cutter, and the existing hole can be expanded to a required diameter by repeating the revolution of the cutter.

  According to the present invention, either one of a copying groove wheel provided with a groove to be engaged with the inner peripheral edge of the existing hole and a rotary input shaft provided with a cutter that cuts the inner peripheral edge of the existing hole by rotation is provided. Since the tool base is held so that it can move in the direction in which it moves toward and away from the other, and the movement elasticity in the direction in which it always moves away from the other is urged, the rotational input shaft and the profile groove wheel Is inserted into the existing hole in a close state, the concave groove of the copying groove wheel is engaged with the inner periphery of the existing hole, the approach of the copying groove wheel and the rotary input shaft is released, and the cutter is moved to the inner periphery of the existing hole. When the rotary input shaft is rotated in pressure contact with the blade, the cutting tool revolves while sequentially cutting the inner periphery of the existing hole, so that the entire inner peripheral length of the existing hole can be cut, and the existing tool is rotated and revolved. The diameter of the hole can be expanded with high precision, and the rotation input shaft and the profile groove wheel are close to each other. By ensure a long stroke of the recoil can correspond broadly to different diameters of the existing hole, it is possible to ensure a sufficient diameter amounts.

  In addition, since the cutter is pressed against the inner circumference of the existing hole by the spring pressure, the inner circumference of the existing hole can be cut by simply rotating and revolving the cutter, and the cutter is artificially placed on the inner circumference of the existing hole. The pressing work is no longer necessary, the diameter expansion work is simple and labor-saving, and the cutting amount can be adjusted easily by revolving the blade while looking at the cutting amount. The diameter can be expanded.

  Furthermore, since the cutter cuts the inner periphery of the existing hole in a state parallel to the axis of the existing hole, the existing hole can be cut and expanded so as not to produce an acute angle on the inner peripheral surface, and the inserted cord Etc. are not damaged at the inner periphery of the enlarged diameter hole.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the existing hole diameter increasing tool 1 is provided at the tool base 2, the scanning shaft 3 provided at one end in the length direction of the tool base 2, and at the other end as well. The rotary input shaft 4 and a spring 5 that constantly urges the rotary input shaft 4 in the direction away from the copying shaft are engaged with the inner peripheral edge of the existing hole A that is a diameter expansion rod. A profile groove wheel 7 having a recessed groove 6 is provided rotatably, and a cutting tool 8 for cutting the inner peripheral edge of the existing hole A is provided on the rotary input shaft 4.

  The tool base 2 is made of a metal material and is formed in a box shape that is an internal hollow rectangle including the front wall 2a, the rear wall 2b, and the peripheral wall 2c facing each other, and follows the one end side of the tool base 2 in the length direction. The shaft 3 is fixed, and the front wall 2a and the rear wall 2b are provided with long holes 9 along the length direction in a range approaching the copying shaft 3 from the other end side of the tool base 2, and both the long holes 9 are formed. The rotating input shaft 4 that penetrates is movable toward and away from the copying shaft 3.

  The scanning shaft 3 and the rotation input shaft 4 are arranged in a parallel state, and the scanning shaft 3 protrudes forward from the front surface of the tool base 2, and a scanning groove wheel 7 in which a concave groove 6 is provided around the protruding portion. The rotary input shaft 4 is also integrally provided with a cutter 8 at a tip portion that protrudes to the front side of the tool base 2, and the concave groove 6 and the cutter 8 have an equal distance from the front side of the tool base 2. The blade 8 is formed in the shape of a grooved wheel by providing a large number of axial cutting edges 11 in a circular arrangement with a smaller diameter than the flange 10 around the front and rear opposing flanges 10. The peripheral edge of the existing hole A is cut by the blade edge 11 by rotation.

  The rotary input shaft 4 can be moved toward and away from the copying shaft 3 within the length range of the long hole 9 and can be moved inside the tool base 2 so as to be movable in the length direction. A spring 5 that is rotatably supported by a bearing 13 and is incorporated on both sides of the tool base 2 with the copying shaft 3 sandwiched between the spring 5 and the rotation input shaft 4 via the moving member 12 is always in a direction away from the copying shaft 3. Energizes moving elasticity.

  The rotation input shaft 4 has a rear end portion protruding rearward from the rear wall 2b of the tool base 2 as an angular shaft portion 4a for coupling with the rotary drive machine, and a fixing member fixed to a portion protruding from the rear wall 2b. 14 is attached to the tool base 2 in a retaining manner.

  In the example shown in the figure, the scanning shaft 3 is disposed at a fixed position with respect to the tool base 2 and the rotation input shaft 4 is movable. On the contrary, the rotation input shaft 4 is disposed at a fixed position. The copying shaft 3 may be movable back and forth with respect to the rotation input shaft 4.

  The diameter expansion tool of the present invention is configured as described above. Next, a method for expanding the diameter of an existing hole using the diameter expansion tool will be described.

  For example, in an electrical installation device formed using a metal plate, in order to expand the diameter of a circular existing hole A previously drilled to a design dimension in a metal plate for drawing out wiring cords, a tool base 2 is held by one hand, and the rotary input shaft 4 is pressed against the copying shaft 3 against the elasticity of the spring 5 with the other hand, and the copying groove is formed in the existing hole A in a state where the rotating input shaft 4 is brought close to the copying shaft 3. When the wheel 7 and the cutter 8 are inserted from one surface side and the concave groove 6 of the copying groove wheel 7 is engaged with an arbitrary position on the inner periphery of the existing hole A, the spring 5 is released. The rotation input shaft 4 is separated from the copying shaft 3 by the elasticity of the above, so that the concave groove 6 of the copying groove wheel 7 and the cutting edge 11 of the cutter 8 are in pressure contact with the inner periphery of the existing hole A.

  As shown in FIGS. 3 (a) and 3 (b), the profile groove wheel 7 and the blade 8 are pressed against the positions of both sides of the shaft center at the inner peripheral edge of the existing hole A by the separation of the spring 5 due to the elasticity. By extending in the diameter direction of the hole A, the diameter-enlarging tool 1 is attached to the existing hole A provided in the metal plate of the electrical equipment device by the groove shape of the concave groove 6 and the blade 8, and at this time With this, the hand can be released from the diameter expanding tool 1.

  In this state, as shown in FIG. 3A, the rotary drive shaft B of the electric tool is connected to the rear end angle shaft 4a of the rotary input shaft 4 by clamping with a chuck, and the rotary input shaft 4 is connected to the rotary input shaft 4 as shown in FIG. When the counterclockwise rotation is applied, the blade 8 provided on the rotation input shaft 4 is pressed against the inner peripheral edge of the existing hole A by the force of the spring 5, so that the existing hole is formed at the cutting edge 11 by rotation (spinning). When the pressure contact portion of the inner peripheral edge of A is cut and the rotary input shaft 4 is moved (revolved) in the circumferential direction of the existing hole A (counterclockwise in FIG. 3B) together with the rotary drive B, FIG. ) And (b), the cutter 8 moves along the inner periphery of the existing hole A while sequentially cutting the inner peripheral edge of the existing hole A by rotation.

  At this time, the copying groove wheel 7 is located at a position opposite to the center of the cutting tool 8 and the existing hole A, and the concave groove 6 is fitted to the plate thickness of the metal plate provided with the existing hole A. Accordingly, the tool base 2 is rotated, and cutting is continued while maintaining the state in which the blade 8 is pressed against the inner periphery of the existing hole A.

  4A and 4B, the revolving movement of the blade 8 advances when the cutting edge 11 bites into the inner peripheral edge of the existing hole A due to its own rotation and cuts. Since it is automatically generated by the movement, the rotary drive unit B coupled to the rotary input shaft 4 and held by hand may be rotated in accordance with this revolution.

  The inner peripheral length of the existing hole A is uniformly cut by a predetermined amount by one revolution of the cutter 8, and the existing hole A can be expanded in diameter by repeating the revolution of the cutter, as shown in FIG. 5 (b). As described above, the diameter of the existing hole A can be expanded to the diameter-enlarged hole a.

  When the diameter of the existing hole A is increased to the required diameter, the rotary drive B is stopped and removed from the rotary input shaft 4, and the rotary input shaft 4 is moved closer to the copying shaft 3 against the spring 5, and the copying groove is obtained. The work is completed when the wheel 7 and the blade 8 are extracted from the diameter expansion hole a.

  Since the cutter 8 cuts the inner periphery of the existing hole A with the cutting edge 11 parallel to the axis, the inner periphery of the existing hole A can be cut in a state parallel to the axis of the existing hole A, and the diameter-enlarged hole The inner circumference of a is perpendicular to the surface of the metal plate, and by eliminating the occurrence of an acute angle portion in the inner circumference of the enlarged diameter hole a, the inserted wiring cords are not damaged.

  Moreover, since the moving stroke of the rotary input shaft 4 can be secured long by the long hole 9, for example, it is possible to deal with a wide range of existing holes A having different diameters with a single structure, and in the range from 30 mm to 50 mm in diameter. A sufficient amount of cutting can be ensured.

The perspective view which shows the diameter expansion tool which concerns on this invention (A) is an enlarged vertical side view of the diameter expanding tool, (b) is a vertical front view taken along line bb of (a). (A) is a partially cut-away vertical side view showing a state before the start of cutting in which a diameter expanding tool is attached to an existing hole, and (b) is a vertical front view taken along line bb of (a). (A) is a longitudinal front view showing a state immediately after the start of cutting of a diameter expanding tool attached to an existing hole, and (b) is a longitudinal front view showing a state in which substantially half of the existing hole is cut. (A) is a longitudinal front view showing a state immediately before the diameter expansion tool cuts substantially the entire circumference of the existing hole, and (b) is a front view showing the relationship between the existing hole and the diameter expansion hole cut from the hole.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Diameter-expansion tool 2 Tool base 3 Follow shaft 4 Rotation input shaft 5 Spring 6 Groove 7 Follow groove wheel 8 Cut tool 9 Long hole 10 Flange 11 Cutting edge 12 Moving member 13 Bearing 14 Stopping member

Claims (2)

  A rotation input shaft provided with a profile groove wheel in which a groove for engaging with an inner peripheral edge of an existing hole, which is a diameter expansion screw, is provided on a tool base, and a cutter for cutting the inner peripheral edge of the existing hole by rotation. It is provided in a parallel arrangement, and either the profile groove wheel or the rotation input shaft is held by the tool base so as to be able to move in the direction of approaching and moving away from the other. A tool for expanding the diameter of an existing hole that urges the moving elasticity in a direction that always separates.   A groove wheel that follows the one end side of the tool base is attached so as to protrude to one surface side of the tool base in an arrangement perpendicular to the length direction of the tool base, and the length of the tool base is extended to the other end of the base. A rotary input shaft that can move along the provided long hole is mounted, a blade is provided on a portion of the rotary input shaft that protrudes on one side of the tool base, and a spring incorporated in the tool base is used to rotate the rotary input shaft. The diameter expansion tool of the existing hole according to claim 1, wherein the moving elasticity in a direction always separating from the grooved wheel is urged.

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