JP2010269386A - Blade of boring tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blade of a boring tool preventing separation of a boring blade and timing belt even in use when boring a noncircular through-hole. <P>SOLUTION: The boring blade has: a blade body formed in an endless belt shape; and the timing belt formed in the endless belt shape of meshing with a rotary mechanism, and is characterized in that the blade body has a plurality of blade bodies formed on one end side of the blade body and a plurality of connecting parts arranged at an interval in its peripheral direction on the other end side of the blade body to be connected to the timing belt and formed by projecting toward the timing belt from the other end, and the timing belt has a plurality of insertion parts for inserting the connecting parts, and the blade body and the timing belt are connected by inserting the connecting parts into the insertion parts. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a blade of a punching tool for punching a non-circular through hole in a wall material.

  As described in Patent Document 1, a punching tool for drilling a non-circular through hole in a wall surface or the like of a wall material is known. The punching tool is configured to drive a driving source in a state where the front surface is pressed against a wall surface and rotate the cutting blade to punch a non-circular through hole in the wall material with the cutting blade.

JP 2002-103119 A

  As shown in FIG. 13, a punching blade 100 of a punching tool described in Patent Document 1 includes a blade body 101 formed in a cylindrical shape and a timing belt 102 provided on the base end side of the blade body 101. Has been. When the pulley teeth of the pulley mesh with the concave and convex teeth of the timing belt 102, the rotational force of the pulley is transmitted to the drilling blade 100. The pulley is driven and actuated by an electric drill as a drive source to rotate the drilling blade 100, and the drilling blade 100 forms a non-circular through hole in the wall material. FIG. 13 is a side view of the drilling blade 100 with a part of the drilling blade 100 cut away.

  As shown in FIG. 13, the punching blade 100 of the punching tool described in Patent Document 1 has a base end side of a cylindrical blade body 101 and a timing belt 102 bonded together with an adhesive 103. As described above, when the perforation blade 100 is rotated to perforate non-circular through holes in the wall material, the perforation blade 100 is circular in the range N as shown in FIG. An arc shape is formed, and in the range M, a flat shape is obtained. FIG. 14 shows a state in which the drilling blade 100 shown in FIG. 13 is viewed from the front side.

  For this reason, when the drilling blade 100 is in an arcuate shape or a flat shape while the drilling blade 100 is rotating, the shape frequently changes. In particular, since the timing belt 102 is made of rubber, the shape of the drilling blade 100 is changed as described above, thereby causing the following problems.

  That is, when the drilling blade 100 changes from the flat shape to the arc shape when moving from the range M to the range N as shown in FIG. 14 during drilling, as shown in FIG. A tensile force F1 acts on the outer layer of the belt 102 in the circumferential direction of the perforating blade 100, so that the outer layer of the timing belt 102 tends to extend, while, as shown in FIG. In the case of changing from the arc shape to the flat shape when moving from the range M to the range M, as shown in FIG. 16, a pressing force F2 that shrinks the timing belt 102 is applied to the outer layer of the timing belt 102. Acts to cause the timing belt 102 to shrink.

  As described above, since the pulling force F1 and the pressing force F2 act alternately on the timing belt 102 during the rotation of the drilling blade 100, the timing belt 102 and the adhesive material 103 are easily peeled off. When the peeling occurs, the blade body 101 and the timing belt 102 are separated from each other, and there is a problem that the function as a punching tool is not achieved.

  The present invention has been made in view of the above-mentioned problems of the prior art, and the purpose thereof is to prevent separation of the drilling blade and the timing belt even when used in drilling a non-circular through hole. It is to provide a blade for a punch.

The invention according to claim 1 is a blade of a drilling tool for drilling a non-circular through hole in a wall material by rotating a drilling blade formed in an endless belt shape by a rotation mechanism,
The perforated blade includes a blade body formed in an endless belt shape, and a timing belt formed in an endless belt shape meshing with a rotation mechanism,
The blade main body is provided with a plurality of blade bodies formed on one end side of the blade main body and the other end side of the blade main body at intervals in the circumferential direction to be connected to the timing belt. A plurality of connecting portions formed protruding from the end toward the timing belt;
The timing belt includes a plurality of insertion portions through which the connecting portion is inserted,
The connecting portion is inserted into the insertion portion, and the blade body and the timing belt are connected.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, an interval for discharging chips is provided between the other end of the blade body and the timing belt. To do.

  According to the first aspect of the present invention, the plurality of connecting portions provided at intervals in the circumferential direction of the blade body and the insertion portion of the timing belt are connected to each other. The blade main body and the timing belt are not connected to each other and are freely deformed at portions where the connecting portion and the insertion portion are not provided. Can do. For this reason, during the rotation of the drilling blade, the force that separates the blade body and the timing belt does not act even if the blade body and the timing belt repeat an arcuate shape and a flat shape. Further, since the blade body and the timing belt are connected by inserting the connecting portion of the drilling blade into the insertion portion of the timing belt, the rotational force transmitted from the rotational drive source to the timing belt is transmitted from the timing belt to the blade body. Can be transmitted accurately.

  That is, according to the first aspect of the present invention, the blade body and the timing belt are firmly connected to each other, and the rotational force of the timing belt transmitted from the drive source is securely transmitted to the blade body. Since the timing belt and the timing belt are not bonded to each other, they can be freely deformed to form an arc shape or a flat shape, and the blade body and the timing belt can be deformed at the time of the deformation. And will not separate.

  According to the second aspect of the present invention, the chips generated when the through hole is drilled can be discharged to the outside of the drilling blade from the interval between the blade body and the timing belt.

FIG. 1 is a perspective view of a punch. FIG. 2 is a longitudinal sectional view of the punch. FIG. 3 is a perspective view of the drilling blade. FIG. 4 is a bottom view of the drilling blade. FIG. 5 is a view showing a state in which the drilling blade in a state of being hung on two pulleys is viewed from the timing belt side. FIG. 6 is a view showing a state where two pulleys are separated from each other. FIG. 7 is a view showing a state in which two pulleys are brought close to each other. FIG. 8 is a perspective view of the pulley. 9 is a cross-sectional view taken along the line YY in FIG. FIG. 10 is a diagram illustrating a state in the middle of attaching the cover body. FIG. 11 is a diagram of FIG. 10 viewed from the direction indicated by the arrow R. FIG. 12 is a view showing a state in which the divided body of the cover body is closed from the state of FIG. FIG. 13: is a side view which fractures | ruptures and shows a part of drilling blade of background art. FIG. 14 is a diagram showing a form of a perforated blade of the background art at the time of drilling. FIG. 15 is a cross-sectional view taken along the line CC of FIG. 13 and shows a state in which the drilling blade has a semicircular arc shape. 16 is a cross-sectional view taken along the line CC of FIG. 13 and shows a state in which the drilling blade is flat.

  As shown in FIG. 1, the punch 1 according to the present embodiment is a punch that punches a non-circular through hole T in a wall material H. As shown in FIG. 2, the drilling tool 1 includes a rotating mechanism 3 that rotationally drives the drilling blade 2, and the drilling blade 2 is driven to rotate by the driving force of an electric drill D as a driving source. A non-circular through hole T is formed in the wall material H with the blade 2. Here, the non-circular shape corresponds to an oval shape composed of a straight portion 4 and a semicircular arc portion 5 as shown in FIG.

  As shown in FIG. 3, the drilling blade 2 is configured in an endless belt shape from a blade body 6 and a timing belt 7 provided on the base end side of the blade body 6, and the blade body 6, the timing belt 7, An interval 8 is provided between them. The interval 8 is for discharging chips inside the blade body 6 to the outside of the drilling blade body.

  As shown in FIG. 3, the blade body 6 has a cylindrical shape in a natural state, and a plurality of blade bodies 9 are provided in the circumferential direction on one end side, and a connecting portion 10 is provided on the other end side. ing. The blade body 6 can be formed from, for example, stainless steel having spring properties.

  The connecting portion 10 is attached to the other end side of the blade body 6 and is provided so as to protrude toward the timing belt 7. As shown in FIG. 3, the connecting portion 10 can be provided in parallel to the axis L of the blade body 6. A plurality of the connecting portions 10 are provided at intervals in the circumferential direction of the blade body 6. The connecting portion 10 is formed in, for example, a plate shape or a rod shape, and its proximal end side is fixed to the side surface of the blade body 6 by means such as rivets or spot welding, and its distal end side is directed to the timing belt 7 side. Protrusively toward.

  The timing belt 7 is formed in an endless belt shape, as shown in FIGS. 3, 4 and 5, and has an uneven tooth 12 which meshes with a pulley tooth of a pulley 11 to be described later, The end surface 13 is provided with a plurality of insertion portions 14. The insertion portion 14 is formed in parallel with the axis L of the blade body 6. The insertion portion 14 is provided in the width direction of the timing belt 7, and a plurality of insertion portions 14 are formed at predetermined intervals in the circumferential direction of the timing belt 7. The connecting portion 10 is inserted into the insertion portion 14, and the connecting portion 10 is inserted into the insertion portion 14 so as not to come out of the insertion portion 14. And are firmly connected. In addition, by inserting the connecting portion 10 into the insertion portion 14 with the adhesive in the insertion portion 14, the connection between the insertion portion 14 and the connecting portion 10 may be reinforced with an adhesive. Good. 3 shows a perspective view of the drilling blade 2, FIG. 4 shows a state of the drilling blade 2 viewed from the timing belt 7, and FIG. 5 shows a state in which the drilling blade 2 is mounted on two pulleys 11 as will be described later. And the state which abbreviate | omitted the pulley 11 is shown. As shown in FIG. 5, the drilling blade 2 has a flat shape in the range X and a semicircular arc shape in the range Z.

  Next, the rotation mechanism 3 will be described. As shown in FIG. 2, the rotating shaft 15 is provided so as to penetrate the center of the punching tool main body 16 in the front-rear direction. The rotary shaft 15 is provided to be movable back and forth in the axial direction. A state in which the rotating shaft 15 moves forward (in the direction of arrow A) is defined as forward movement, and a state in which the rotation shaft 15 moves in the rear direction (indicated by arrow B) is referred to as backward movement.

  The punching tool main body 16 is provided with a cover body attaching portion 17 on the distal end side, and a cover body 18 is detachably attached thereto. Further, a spring chamber 19 is provided inside the punching tool body 16, and a shaft through hole 20 is provided so as to penetrate the spring chamber 19 in the front-rear direction. The shaft through-hole 20 is provided with a bearing 21, and the bearing 21 supports the rotary shaft 15 so as to be rotatable and movable back and forth in the axial direction. Further, a mechanism (not shown) for adjusting the amount of movement of the rotary shaft 15 in the front-rear direction is separately provided.

  A coiled compression spring 22 is provided in the spring chamber 19. One side of the spring chamber 19 is a spring seat 23, and the rotary shaft 15 is provided with a spring receiver. The compression spring 22 is provided between the spring seat 23 and the spring receiver, and always urges the rotating shaft 155 in the backward direction.

  A drive gear 24 is attached to the distal end side of the rotary shaft 15. A conduction gear 25 is provided adjacent to the lateral side of the drive gear 24 in the axial direction, and a movable portion 26 is provided on the lateral side of the drive gear 24 in the axial direction. The drive gear 24 and the transmission gear 25 are engaged with each other.

  The pulley 11 is provided so as to face the front surface of the transmission gear 25, and the pulley 11 is provided so as to face the front surface of the movable portion 26.

  The proximal end side of the chuck portion 27 is fixed to the transmission gear 25 so as to penetrate the center of the conduction gear 25, and the distal end side of the chuck portion 27 is fixed so as to penetrate the center of the pulley 11. Yes. The proximal end of the drill 28 is fixed to the distal end side of the chuck portion 27.

  The proximal end side of the chuck portion 29 is fixed to the movable portion 26 so as to penetrate the center of the movable portion 26, and the distal end side of the chuck portion 29 is fixed to the pulley 11 so as to penetrate the center of the pulley 11. Has been. The proximal end of the drill 30 is fixed to the distal end side of the chuck portion 29. The drills 28 and 30 are used to position the drilling tool 1 by cutting into the wall material prior to drilling.

  The movable portion 26 is configured to be movable so as to approach or separate from the lateral direction with respect to the rotating shaft 15 by being tightened or loosened with a screw 31. FIG. 6 shows a state in which the movable portion 26 is separated from the rotating shaft 15. 6 and 7 are cross-sectional views taken along the line EE in FIG. 2, and FIG. 7 shows a state in which the movable portion 26 shown in FIG.

  Here, as shown in FIG. 7, the state in which the movable portion 26 is close to the rotation shaft 15 is between the pulleys 11 and 11 and the drilling blade 2 so that the drilling blade 2 can be attached to and detached from the pulleys 11 and 11. As shown in FIG. 6, the state where the movable portion 26 is separated from the rotating shaft 15 is a state after the drilling blade 2 is attached to the pulleys 11, 11, and the punching tool 1. The operational state of is shown.

  As shown in FIG. 2, the drive gear 24, the transmission gear 25, and the movable portion 26 are accommodated in a gear accommodating portion.

  As shown in FIGS. 8 and 9, the pulleys 11 and 11 are molded of synthetic resin, and a plurality of pulley teeth 31 are provided on the outer periphery so that the uneven teeth 12 of the timing belt 7 mesh with each other. Yes. 8 is a perspective view of the pulley 11, and FIG. 9 is a cross-sectional view in the direction of arrows YY in FIG.

  A synthetic resin flange 32 is provided on the front side of the pulley 11 in the axial direction, and a metal flange 33 is provided on the rear side. Here, the front side is the side where the drilling blade 2 is provided, as shown in FIG. The front flange 32 and the rear flange 33 prevent the timing belt 7 from being displaced from the pulleys 11 and 11. Further, as will be described later, the rear flange 33 is made of metal so that it does not bend against the reaction force of the timing belt 7 when the timing belt 7 of the drilling blade 2 is pushed forward. And is attached to the pulley 6 with screws or the like.

  As shown in FIGS. 8 and 9, between the adjacent pulley teeth 31, a meshing portion 34 is meshed with the concave and convex teeth 12 of the timing belt 7.

  As shown in FIG. 9, the pulley 11 of the present embodiment is formed with a chip discharge groove 35 communicating with the meshing portion 34 toward the center of the pulleys 11 and 11. Further, as shown in FIG. 9, the chip discharge groove 35 is closed on the rear side (flange 33 side). The chip discharge groove 35 is formed such that the front side (perforation blade 2 side) is deeper toward the center of the pulley 11 than the rear side of the pulley 11, so that the groove bottom 35 </ b> A of the chip discharge groove 35 is a pulley. 11 is inclined from the rear side to the front side, and a chip discharge hole 36 communicating with the chip discharge groove 35 is provided on the front surface of the pulley 11 so that the chip K enters between the pulley teeth 31. Is formed to the outside of the pulley 11 through the chip discharge groove 35 and the chip discharge hole 36. The chip discharge hole 36 can be formed in various shapes such as a substantially rectangular shape and a square shape.

  As shown in FIG. 2, two support rods 37 are erected on the cover body mounting portion 17 of the punching tool main body 16, and an alignment holding portion 38 is fixed to the tips of the support rods 37, 37. Has been.

  As shown in FIG. 2, the alignment holding portion 38 is provided with an alignment portion 39 that can move in the front-rear direction. The positioning portion 39 is urged by a compression spring 40 so as to always protrude forward. Further, the drills 28 and 30 protrude from the alignment holding portion 38. The positioning unit 39 aligns the drilling tool 1 prior to the drilling operation.

  As shown in FIG. 2, the cover body 18 is attached to the cover body attachment portion 17 of the punching tool main body 16. The cover body 18 is provided so as to surround the rotation mechanism 3 and the lateral outer periphery of the drilling blade 2. As shown in FIGS. 10 and 11, the cover body 18 includes a base body 41 on the base end side and divided bodies 42 and 42 provided on the front end side of the cover body 41. The divided bodies 42 are formed by being divided so as to open the front end side of the cover body 18 laterally with respect to the rotating shaft 15. FIG. 11 shows the state of FIG. 10 viewed from the direction indicated by the arrow R. As shown in FIG. 2, the cover body 18 is provided with a chip receiver W so that the chips K can be collected.

  As shown in FIGS. 10 and 11, the cover body 41 is provided with a hook receiving portion 44 that is hooked on a hook portion 43 provided in the cover body mounting portion 17.

  In addition, it is used when adjusting the attitude | position of the punch 1 to an appropriate attitude | position with a 45 level in the figure.

  Next, a case where the drilling blade 2 is attached to the pulley 11 will be described. First, in the state of FIG. 2, the two pulleys 11 and 11 are brought closer to each other as shown in FIG. 7 by bringing the movable portion 26 closer to the rotating shaft 15.

  In this state, after the timing belt 7 of the drilling blade 2 is mounted on the two pulleys 11, 11, the movable portion 26 is separated from the rotating shaft 15 as shown in FIG. Is engaged with the pulley teeth 31 of the pulley 11 and the perforating blade 2 is tensioned.

  In this state, as shown in FIG. 11, in the range X in which the timing belt 7 is not meshed with the pulleys 11 and 11, the blade body 6 swells in the lateral direction.

  Next, as shown in FIG. 12, by bringing the two divided bodies 42 and 42 closer to each other, the portion that swells in the lateral direction of the blade body 6 is pressed by the two divided bodies 42 and 42 from both sides. As shown in FIG. 12, it is corrected to a flat form.

  Next, the operation will be described. In the state shown in FIG. 1, when the electric drill D is driven, the rotary shaft 15 rotates, and the rotational force of the rotary shaft 15 passes through the drive gear 24, the transmission gear 25, and the pulleys 11 and 11 shown in FIG. Is transmitted to. Then, by pressing the perforating blade 2 against the wall material H, a non-circular through hole T can be formed in the wall material H as shown in FIG.

  FIG. 5 shows a state in which the perforating blade 2 is viewed from the timing belt 7 side in a state where a noncircular through hole is perforated by the perforating blade 2. As shown in FIG. 5, the punching blade 2 has a flat shape in the range X and a semicircular arc shape in the range Z. The connecting portion 10 of the blade body 6 is inserted into the insertion portion 14 of the timing belt 7 so that the blade body 6 of the drilling blade 2 and the timing belt 7 are partially connected. Thus, since the blade body 6 of the drilling blade 2 and the timing belt 7 are not configured to adhere to each other on the surface, the blade body 6 and the timing belt 7 are not provided in the portion where the connecting portion 10 and the insertion portion 14 are not provided. Since they are not connected, they can be deformed freely. For this reason, during the rotation of the drilling blade 2, even if the blade body 6 and the timing belt 7 repeat an arcuate shape and a flat shape, the force for separating the blade body 6 and the timing belt 7 does not act. As a result, as shown in FIG. 5, the blade body 6 and the timing belt 7 of the drilling blade 2 are not separated from each other even if the drilling blade 2 is deformed into a flat shape and a semicircular arc shape. The rotational force transmitted from 11 can be securely transmitted from the timing belt 7 to the blade body 6. Further, since the insertion portion 14 of the timing belt 7 is provided in a direction perpendicular to the rotation direction of the pulley 11, the connecting portion 10 of the blade body 6 comes out of the insertion portion 14 during the drilling operation. In addition, the rotational force of the pulley 11 can be securely transmitted to the drilling blade 2.

  In the middle of the drilling operation, the chips K may enter the inside of the drilling blade 2. The chips K that have entered the perforating blade 2 are discharged to the outside of the perforating blade 2 from the interval 8 of the perforating blade 2 shown in FIG. 3 and collected in the chip receiver W shown in FIG. On the other hand, the chip K staying in the drilling blade 2 without being discharged to the outside of the drilling blade 2 from the interval 8 of the drilling blade 2 enters the meshing portion 34 of the pulley 11 as shown in FIG. There is. The chip K that has entered the meshing portion 34 passes through the chip discharge groove 35 and reaches the groove bottom 35 </ b> A of the chip discharge groove 35. Since the groove bottom 35A is inclined toward the chip discharge hole 36 side, the chip K is pressed by the groove bottom 35A and the tip of the concave and convex teeth 12 of the timing belt 7, It is easily discharged from the chip discharge hole 36 to the outside and falls inside the drilling blade 2. Then, the chips K that have fallen inside the punching blade 2 fall into the cover body 18 from the interval 8 between the punching blade 2 and the timing belt 7, and then collected in the chip receiver W. For this reason, it is possible to avoid a phenomenon in which the chips K are clogged between the pulley teeth 31 and the concave and convex teeth 12 of the timing belt 7 and prevent the timing belt 7 from being detached from the pulley 11. Thus, the drilling operation can be performed stably for a long period of time.

DESCRIPTION OF SYMBOLS 1 Drilling tool 2 Drilling blade 3 Rotating mechanism 6 Blade body 8 Space | interval 7 Timing belt 10 Connection part 11 Pulley 14 Insertion part 15 Rotating shaft

Claims (2)

A blade of a punching tool for punching a non-circular through hole in a wall material by rotating a drilling blade formed in an endless belt shape by a rotation mechanism,
The perforated blade includes a blade body formed in an endless belt shape, and a timing belt formed in an endless belt shape meshing with a rotation mechanism,
The blade main body is provided with a plurality of blade bodies formed on one end side of the blade main body and the other end side of the blade main body at intervals in the circumferential direction to be connected to the timing belt. A plurality of connecting portions formed protruding from the end toward the timing belt;
The timing belt includes a plurality of insertion portions through which the connecting portion is inserted,
A blade of a punching tool in which the connecting portion is inserted into the insertion portion and a blade body and a timing belt are connected.   The blade of the punching tool according to claim 1, wherein a gap for discharging chips is provided between the other end of the blade body and the timing belt.

Images