JP4308108B2 - Drilling tool - Google Patents

Description

  The present invention relates to a drilling tool that is attached to a rotary tool such as an electric drill as an attachment and rotates a rotary shaft by the power of the rotary tool to drill through holes of various diameters in a ceiling plate, a wall plate, etc. is there.

  As one of the above-described punching tools, the one disclosed in Patent Document 1 is known. In the drilling tool disclosed in Patent Document 1, the hole diameter is adjusted by loosening the set screw 17 and sliding the arm 16 by hand along the long hole 20 to change the distance from the center drill 14 to the blade 18. . However, in the above operation, the pair of arms 16 are manually slid, the scale provided on the arms 16 is adjusted to a predetermined diameter, and the set screw 17 is loosened and fixed. Misalignment of the fixed positions of both arms 16 with respect to the body 15 is likely to occur. There are also misreading of scales. In this case, there is a problem that the distance from the center drill 14 to each blade 18 is shifted, and a through hole having a predetermined diameter cannot be drilled neatly. Further, since both arms 16 can be rotated around the center drill 14, the arms 16 are rotated in operations such as loosening and tightening the set screw 17 and sliding operations of the arms 16. The adjustment of the hole diameter is difficult to perform, and the blade 18 may turn unexpectedly, resulting in injury.

  Therefore, the applicant of the present invention synchronously slides a pair of arm bodies with blades attached to opposite ends by the same amount in opposite directions by a rack and pinion mechanism so that the distance between the pair of blade bodies becomes the drilling diameter. I devised a mechanism to adjust to. According to this adjustment mechanism, since it is not manual, the workability is good, the pair of arm bodies can be slid to an accurate position and fixed at the position, and the “set screw” or the like does not protrude. There are many advantages.

However, when the perforating tool is pressed against a wall plate made of gypsum board or the like by the perforating tool having the adjusting mechanism, the perforating tool covers a large amount of chips generated by the perforating work, and as a result, the adjusting mechanism It is inevitable that the chips accumulate on the uneven rack teeth of the rack body constituting the rack and pinion mechanism. For this reason, every time the drilling operation is completed, the rack and pinion mechanism will not operate unless the chips accumulated on the uneven rack teeth of the rack body are removed, and the drilling diameter cannot be adjusted. Inconvenient.
JP-A-5-318213

  The present invention relates to an unevenness of a rack body constituting the rack and pinion mechanism in a drilling tool configured to adjust a drilling diameter by a blade body attached to the arm body by sliding the arm body by a rack and pinion mechanism. An object of the present invention is to prevent the chips generated by the drilling operation from accumulating on the rack teeth.

  The invention of claim 1 for solving the above-described problems includes a center shaft, an arm body extending in a direction orthogonal to the axial direction of the center shaft, and slidable in the extending direction, and the arm body. A drilling tool provided with an attached blade body, wherein the arm body has a rack body having concave and convex rack teeth that are continuous along an extending direction of the arm body, and the rack teeth It is configured to be able to adjust the drilling diameter by the blade body by sliding along the extending direction by rotation of a pinion that meshes with the chip, and the rack body has chips generated by drilling the blade body In order to prevent clogging of the recesses between the rack teeth, and to pass and discharge the chips that have entered the recesses, the recesses are provided in communication with the recesses toward the opposite side of the rack teeth. The chip discharge path and the chips in the chip discharge path In order to discharge the section, it is characterized in that it comprises a and a lateral or rack teeth and the chip discharge passage on the side facing the communication with chip discharge port provided in the rack body.

  During the drilling operation performed by rotating the blade body around the center axis, a large amount of chips are generated and tries to deposit on the uneven rack teeth of the rack body constituting the rack and pinion mechanism. In the invention of claim 1, since the above-described chip discharge path and chip discharge port are formed in the rack body, the chips to be deposited on the surface of the uneven rack teeth are adjacent to each other. After passing through the chip discharge path formed toward the opposite side of the rack teeth so as to communicate with the recesses between the rack teeth, the rack body from the chip discharge port communicating with the chip discharge path Discharged to the outside. Moreover, during the drilling operation, vibration is generated in the entire drilling tool, and this vibration acts so that the chips are easily discharged from the chip discharge path. As a result, chips are not deposited on the uneven rack teeth on the surface of the rack body, and the pair of arm bodies are synchronously slid in the opposite directions by the rack and pinion mechanism, and the distance between the pair of blade bodies is increased. The work of changing to the hole diameter can be performed reliably.

  According to a second aspect of the present invention, in the first aspect of the present invention, the chip discharge path is provided with a rack tooth for facilitating the discharge of the chips from a chip discharge port provided in a side portion of the rack body. It is characterized by being formed with an inclined surface inclined with respect to the width direction. For this reason, only by making the bottom surface of the recess between adjacent rack teeth of the rack body an inclined surface, a chip discharge path is formed, and a chip discharge port is formed on one side of the rack body, The chips that have entered the recess are reliably discharged from the chip discharge port on the side surface of the rack body after passing through the chip discharge path formed by the inclined surface.

  The invention according to claim 3 is the invention according to claim 1, wherein the rack teeth are provided along the extending direction of the arm body so that the chip discharge port is provided on both the side surface and the bottom surface of the rack body. And a plurality of protrusions protruding independently from the side surface of the arm body in a direction orthogonal to the extending direction. For this reason, the rack teeth are formed by a large number of independent protrusions, and the chip discharge ports are formed on both the side surface and the bottom surface of the rack body, so that the chips that enter between the rack teeth of the rack body. Is immediately discharged to the outside of the rack body from the chip discharge ports on both the side surface and the bottom surface of the rack body.

  According to a fourth aspect of the present invention, in any of the first to third aspects of the present invention, a pair of arm bodies is provided, and each rack attached to the pair of arm bodies meshes with the pinion to rotate the pinion. The perforation diameter can be adjusted by changing the interval between the pair of blade bodies attached to each arm body by sliding the pair of arm bodies in the reverse direction. For this reason, the pair of arm bodies are synchronously slid in the reverse direction by the rotation of the pinion, the interval between the pair of blade bodies is changed, and the drilling diameter is adjusted.

  According to the present invention, in the drilling tool configured to adjust the drilling diameter by sliding the arm body by the rack and pinion mechanism and changing the distance from the center axis of the blade body attached to the arm body, A chip discharge path is formed in the recess between adjacent rack teeth of the rack body constituting the rack and pinion mechanism, and the chip passing through the chip discharge path is discharged out of the rack. Since the chip discharge port is formed in communication with the chip discharge path, even if the chip generated during the drilling operation enters the recess, the chip discharge path and the chip discharge port are directly passed through. And discharged outside the rack. Therefore, chips do not accumulate in the recess of the rack body, and the rack and pinion mechanism can reliably perform the operation of changing the distance from the center shaft to the blade body and adjusting the drilling diameter.

  Hereinafter, the present invention will be described in more detail with reference to a plurality of the best embodiments of the present invention.

1 is a perspective view in which a part of a punching tool C according to the present invention is broken, FIG. 2 is a plan view, FIG. 3 is a front sectional view, and FIG. it is an exploded perspective view of a main part of a (portion excluding the drive shaft supporting the holder H ₁ and cover V). 1 to 4, the drilling tool C supports the drive shaft 10 while being urged in the backward direction by the restoring force of the compression spring 1 and the center shaft S in which the drill portion 24 is formed only at the tip portion. A substantially cylindrical drive shaft support holder H _1, and a block-shaped arm body attachment holder H ₂ that is integrally attached to a portion of the drive shaft 10 that protrudes from the drive shaft support holder H ₁ to the perforation side; A pair of arm bodies A that are slidably mounted along the direction perpendicular to the protruding direction of the center shaft S on the outside of the opposite side surface of the arm body mounting holder H ₂ , and the pair of arm bodies A are synchronized. And a rack and pinion mechanism R (see FIG. 6) for sliding the same amount in opposite directions to each other, and an opposing end portion (opposite end portion) along the longitudinal direction of the pair of arm bodies A. A pair of blades K Eteiru.

In FIG. 3, the drive shaft support holder H ₁ is rotated to the outside of the holder main body 3 having the cover attaching saddle plate portion 2 formed at one end thereof, and the portion of the holder main body 3 opposite to the saddle plate portion 2. In order to prevent the cutting depth adjusting ring 4 that is movably fitted and the cutting depth adjusting ring 4 from coming out of the holder main body 3, there are a plurality of end surfaces on the opposite side of the holder 2 from the plate 2. And a lid 5 attached via screws (not shown). The drive shaft 10 is pierced and supported by the holder body 3 while being urged in the backward direction by the restoring force of the compression spring 1. The compression spring 1 is housed in a cylindrical portion 3 a of the holder body 3 and is elastically mounted between a bottom surface 3 b of the cylindrical portion 3 a and a spring support 6 attached integrally to the drive shaft 10. The spring support 6 is integrally provided with a contact arm 6a along the radial direction thereof, and advances and retreats together with the drive shaft 10, but does not rotate when the drive shaft 10 rotates. In the portion of the cutting depth adjusting ring 4 whose central angle is in the range of about 180 °, a contact surface 4a with which a contact arm 6a provided integrally with the spring support 6 contacts is formed. The distance between the contact surface 4a and the outer end surface 4b of the cutting depth adjusting ring 4, in other words, the movement distance of the contact arm 6a of the spring support 6 gradually changes along the circumferential direction. With this structure, by rotating the cutting depth adjusting ring 4 with respect to the holder body 3, the protruding length of the drive shaft 10 with respect to the return position of the compression spring 1, that is, the cutting depth of the pair of blades K is obtained. Is adjustable. The cylindrical portion 3 a of the holder body 3 is formed with a slit 3 c into which the abutment arm 6 a provided integrally with the spring holder 6 is inserted along the axial direction of the drive shaft 10.

In FIG. 4, a block-shaped arm attachment holder H ₂ is integrally attached to the tip of the portion of the drive shaft 10 protruding from the drive shaft support holder H ₁ . In addition, the base end portion of the center shaft S is inserted and attached to the arm body attaching holder H _{2 so as} to be concentric with the drive shaft 10. Center axis S, in the case of breakage or the like is attached to the arm member attaching the holder H ₂ replaced. A pair of arm bodies A are attached to the outside of the opposite side surfaces of the arm body attaching holder H ₂ through the rack and pinion mechanism R so as to be slidable by the same amount in the opposite directions. The pair of arm bodies A have the same configuration except that the mounting positions along the vertical direction of the rack body 12 mounted on the inner surface of the arm body main body 11 are different, and the arm body A having the same configuration is shared. Yes. That is, the rack body 12 is attached to one arm body A at one end in the width direction (the upper end when the ceiling plate P is perforated), and the other arm body A has a width. A rack body 12 is attached to the other end portion in the direction. Therefore, in a state where the rack body 12 is attached to each of the pair of arm bodies A, the respective rack teeth 12a are opposed to each other along the oblique direction (in the posture in which the ceiling plate P is drilled, the oblique vertical direction). . The arm body main body 11 is extended along a direction orthogonal to the center axis S in a state of being attached to the arm body attachment holder H ₂ , and the arm body main body 11 has arm arms at both ends in the width direction. preparative flange-shaped guided portion 11a which is fitted with a predetermined gap to each guide portion 25b formed on the upper and lower ends of the arm body attachment surface 25 which is opposite side of the body attachment holder H ₂ is It is bent inward based on the wearing state. One end portion in the longitudinal direction of the arm body main body 11 is bent inward at a substantially right angle with respect to the attachment state to form a blade body attachment portion 11b, and an outer surface of the blade body attachment portion 11b. The blade body K is attached to the top via bolts 13, washers 14 and washers 17 facing upward. A long hole 11c for inserting a pinion shaft 26 and a fastening bolt 41, which will be described later, is formed along the longitudinal direction in the center portion of the arm body main body 11 in the width direction. A rack 15 disposed below the elongated hole 11c is fixed to the inner side surface of one arm body main body 11 of the pair of arm bodies A via screws 16 with the rack teeth 12a facing upward. At the same time, a rack 15 disposed above the elongated hole 11c is fixed to the inner side surface of the other arm body main body 11 with screws 16 with the rack teeth 12a facing downward. Therefore, each rack 15 fixed to the inner surface of each arm body main body 11 constituting the pair of arm bodies A has the same number of teeth meshing with these, and the pitch circle diameter of each pinion 27 having the same pitch circle diameter. They are displaced along the vertical direction by the amount. As a matter of course, the pitch of each rack body 12 attached to the pair of arm bodies A is equal to the pitch of each pinion 27. As a result, in a state where the attached so as to face the pair of arm members A to each arm body attachment surface 25 of the arm member attached holder H ₂ slidably, each mounted on the inner surfaces of the pair of arm members A The rack teeth 12a of the rack body 12 are opposed to each other along the oblique vertical direction. In FIGS. 4 and 5, reference numeral 18 denotes an insertion hole for the screw 16 formed on both ends of the arm body body 11 in the longitudinal direction.

FIG. 5 is a perspective view showing a state in which a pair of arm bodies A are slidably attached to the arm body attaching holder H ₂ by the same amount in opposite directions via the rack and pinion mechanism R and the fastening bolt 41. 6 is an exploded perspective view of the rack and pinion mechanism R, FIG. 7 is a sectional view taken along line XX of FIG. 3, and FIG. 8 is a sectional view taken along line YY of FIG. is there. 4 to 8, the arm body attaching holder H ₂ is provided with a pinion shaft through hole 22 and a tightening bolt through hole 23 extending in a direction perpendicular to the center shaft through hole 21. That is, the center shaft through hole 21 is provided in a plane parallel to the end surface of the drive shaft support holder H _{1 in} the arm body attaching holder H ₂ , and the pinion shaft through hole 22 and the tightening bolt through hole 23 are formed in the arm body. The arm holder A in the attachment holder H ₂ is penetrated on the surface to be attached. As shown in FIG. 7, the pinion shaft through hole 22 and the fastening bolt through hole 23 are provided on both sides of the center shaft through hole 21 at equal intervals with the through hole 21. The center shaft S has a smaller diameter than the drive shaft 10, and the center shaft S is fixed to the arm body mounting holder H ₂ by a non-rotating screw (not shown), and the driving shaft 10 is fixed to the arm body mounting holder H 2. It is fixed to ₂ by welding.

In each arm member attachment surface 25 of the arm member attached holder H _2, a pinion accommodating recess 25a is formed to face (see FIGS. 4 and 7). As shown in FIGS. 6 to 8, pinions 27 arranged in the pinion receiving recesses 25 a are fixed to the pinion shafts 26 penetrating the pinion shaft through holes 22 at a predetermined interval, so that the pinion A unit PU is formed. The arm bodies A are respectively arranged outside the pinions 27 of the pinion unit PU, and the respective pinions 27 and the rack teeth 12a of the rack bodies 12 of the pair of arm bodies A mesh with each other. That is, as shown in FIG. 6, the pair of pinions 27 constituting the pinion unit PU is fixed to the pinion shaft 26 at a predetermined interval, and one pinion 27 is one of the pinions 27 disposed above it. While meshing with the rack teeth 12a of the rack body 12, the other pinion 27 meshes with the rack teeth 12a of the other rack body 12 arranged below the other. With this configuration, the rotation of the pinion shaft 26 disposed in the direction orthogonal to the center axis S at a position close to the center axis S reverses the pair of arm bodies A to which the rack body 12 is integrally attached to the inner surface. The same amount can be slid synchronously in the direction. Both end portions of the pinion shaft 26 constituting the pinion unit PU project through the long holes 11c of the arm body main body 11 constituting the pair of arm bodies A, and each arm body A is one end portion of the pinion shaft 26. The pin 28 is sandwiched between the end face 28a of the knob 28 and the stop ring 29 attached to the other end of the pinion shaft 26 with a predetermined gap. Therefore, without the outside pair of arm members A relative to the arm member mounted holder H _2, which is slidable by the same amount in opposite directions. 4, 7, and 8, reference numeral 31 denotes an E-ring that prevents the retaining ring 29 fitted on one end of the pinion shaft 26 from being removed.

As described above, by rotating the pinion shaft 26, the pair of arm bodies A are slid by the same amount in opposite directions, and the distance between the pair of blade bodies K attached to the opposite end portions of the arm bodies A ( After adjusting D) to be the same as the bore diameter, the pair of arm bodies A are fixed to the arm body attaching holder H ₂ via the fastening bolts 41. Here, since the pinion shaft 26 is supported by the arm body attaching holder H _{2 so} as to be orthogonal to the center axis S and close to the center axis S, a pair of the pinion shafts 26 is formed as described above. When adjusting the interval between the blades K, a rotational force for rotating the center shaft S is hardly generated. For this reason, there is no fear that the pair of arm bodies A, that is, the pair of blade bodies K, rotate during the interval changing operation of the pair of blade bodies, and the adjustment work can be performed safely. In addition, the pinion shaft 26 is orthogonal to the protruding direction of each blade body K (direction parallel to the center axis S), and is disposed at a substantially central portion of each blade body K. Since it is possible to adjust the distance between the pair of blades K in a state where there is no risk of contact with each blade K, it is also safe from this point. 2 and 7, a solid line and a two-dot chain line indicate the maximum interval (D ₁ ) and the minimum interval (D ₂ ) of the pair of blades K, respectively.

Fastening bolt 41 is in a state of arranging the arm member A to the respective arm member attachment surface 25 of the arm member attached holder H _2, the arm member attached holder H with the _second fastening bolt through-holes 23 and the arm members It penetrates the A long hole 11c. The arm body attaching holder H ₂ and the pair of arm bodies A attached to face each arm body attaching surface 25 of the holder H ₂ include a head 41 a at one end of the fastening bolt 41, It is firmly sandwiched and integrated by the end face of the nut 42 with the knob screwed to the other end of the fastening bolt 41. In this state, the drive shaft 10 rotates, and a pair of arm bodies A attached to the front end of the drive shaft 10 via the arm body attachment holder H ₂ are connected to the center shaft S that is concentric with the drive shaft 10. By rotating to the center, the pair of blades K attached to the opposite ends of the pair of arm bodies A rotate, and the distance between the pair of blades K with respect to the wall plate such as the ceiling plate P (D ) Is bored with the same inner diameter as. 4 and 7, reference numeral 43 denotes a washer interposed between the outer surface of one arm body A and the end surface of the nut 42 with knob.

Further, as shown in FIG. 5, a pair of blades K is included in the guided portion 11 a on the side where the drill portion 24 of the center shaft S is disposed, among the pair of guided portions 11 a constituting each arm body A. A scale 32 for displaying the same drilling diameter as the interval (D) is provided. The arm member mounted holder H ₂ guided portion 11a and the surface 34 of the same side of the scale 32 of the pair of surfaces has been subjected to the center shaft S is opposed penetrates in the reference position for reading the graduations 32 An arrow 33 is formed.

Further, as shown in FIGS. 1 to 3, the drive shaft supporting the holder H _1, a cover V that chips are prevented from scattering to the periphery is mounted detachably at the perforation. Cover V includes a peripheral wall 51 which is cylindrical, the drive shaft supporting the holder H ₁ holder body 3 can be inserted a through hole 52a is made from the bottom wall portion 52 formed in the central portion, the bottom wall 52 The drive shaft support holder H ₁ is detachably attached to the cover mounting saddle plate portion 2. On the opening side of the peripheral wall 51, a flange-shaped flange 51a is formed integrally with the outside, and the flange 51a is a vibration for contacting the wall plate and absorbing vibrations or the like when drilling. The absorber 53 is affixed. The vibration absorber 53 is made of an elastic body such as rubber.

  Here, when the pair of arm bodies A are slid using the rack and pinion mechanism R, chips generated during drilling are clogged in the recesses 12b between the rack teeth 12a of the rack body 12, and the rack Operation of the pinion mechanism R may be difficult or impossible. In particular, when the material of the wall board is gypsum board or the like, the amount of generated chips is large, and therefore the chips are easily clogged (deposited easily) in the recesses 12b between the rack teeth 12a. Therefore, as shown in FIGS. 6 and 9, the rack body 12 has a structure capable of preventing clogging of chips generated at the time of drilling in the recesses 12b between the adjacent rack teeth 12a. That is, the bottom surface of the recess 12b between the adjacent rack teeth 12a is an inclined surface that is greatly inclined with respect to the tooth thickness direction Q of the rack teeth 12a to constitute the chip discharge path 12c. One side of the body 12 is greatly opened to form a chip discharge port 12d. Therefore, in the rack body 12 in which the rack teeth 12a face upward when the ceiling plate is drilled, as shown in FIG. 9, the chips L that are generated during the cutting and fall on the rack teeth 12a are inclined surfaces. Are dropped along the chip discharge passage 12c, and are smoothly discharged from the side chip discharge port 12d to the outside of the rack body 12, so that the recesses 12b between the adjacent rack teeth 12a. The chips L will not be clogged. Further, during the drilling operation, the rack body 12 is vibrated by the vibration acting on the entire punching tool C, and the chip discharge passage 12c is formed between the adjacent rack teeth 12a. An increase in the space volume of the recesses 12b between the rack teeth 12a can also contribute to the clogging of the chips L in the recesses 12b between the rack teeth 12a.

  On the other hand, even in the rack body 12 in which the rack teeth 12a face downward when the ceiling plate P is drilled, chips are less likely to be clogged between the rack teeth 12a from the attitude of the rack body 12 during drilling. There are cases where it is not limited to the ceiling plate but may be a wall plate, and there are various cases in which the drilling tool is installed after drilling. Therefore, in the chip discharge path 12c formed between the adjacent rack teeth 12a, the chips are clogged in the recesses 12b between the rack teeth 12a even when the rack teeth 12a face upward. It can fulfill the function of preventing

  Further, in the rack body 12 shown in FIG. 10, the central portion along the tooth thickness direction Q of the rack teeth 12 a is the highest on the bottom surface of the recess 12 b between the adjacent rack teeth 12 a, and the tooth thickness A pair of chevron-shaped chip discharge passages 12 c are formed such that both ends in the direction Q are lowered, and the chip discharge passages 12 c are formed on both side surfaces of the rack body 12. Also with this configuration, the chips L that enter the recesses 12b between the adjacent rack teeth 12a and are to be accumulated in the recesses 12b pass through the chevron-shaped chip discharge path 12c, and the chip discharge ports on both sides. It is smoothly discharged from 12d to the outside of the rack body 12.

  Further, the rack body 12 shown in FIG. 11 is obtained by deepening the recesses 12b between the adjacent rack teeth 12a, and the chips L temporarily accumulated in the deep recesses 12b act on the rack body 12. Is discharged from the chip discharge ports 12d on both side surfaces of the rack body 12 by the vibration. For this reason, the chips L are not clogged between the recesses 12b between the adjacent rack teeth 12a.

  The rack body 12 ′ shown in FIG. 12 is spaced from the side surface of the arm body A in the tooth thickness direction Q perpendicular to the extending direction M at a predetermined interval along the extending direction M of the arm body A. A large number of independently projecting protrusions N are formed, rack teeth 12a ′ are formed by the protrusions N, and recesses 12b ′ are formed between adjacent protrusions N, and the rack body A chip discharge port 12d ′ is formed at a total of three locations including the lower surface and both side surfaces of 12 ′. The rack body 12 'has an advantage of high chip discharge capability because large chip discharge ports 12d' are formed in three different directions.

  In each rack body 12 shown in FIGS. 10 to 12, chip discharge ports 12 d are formed on both sides of the rack body 12, but the chip discharge ports 12 d of the rack body 12 in the arm body main body 11 are formed. For example, if a discharge hole is formed in the part, the chips can be discharged to the side of the arm body main body 11 through the discharge hole.

When the cover V is attached to the drive shaft support holder H ₁ and the ceiling plate P is perforated, the perforation center J marked on the ceiling plate P is perforated as shown in FIGS. The base end portion of the drive shaft 10 is electrically driven in a state where the drill portion 24 at the tip of the center shaft S of the tool C is applied and the vibration absorber 53 provided in the opening of the cover V is pressed against the ceiling plate P. The center shaft S is pressed by the electric drill E until it reaches the set cutting depth while being fitted to the drive shaft portion of the drill E and rotating the center shaft S. As shown in FIG. 3, since the tip of the center shaft S is disposed ahead of the tip of the pair of blade bodies K along the projecting direction of each blade body K, the center axis S is first drilled by the center shaft S. After that, the pair of blades K are gradually cut while rotating, whereby the through hole B having the set inner diameter (D) is drilled in the ceiling plate P without being misaligned. Although the chips are scattered at the time of drilling, since the drilled portion is sealed by the cover V, the chips are accommodated in the cover V without being scattered around.

  Here, the chips try to accumulate in the recesses 12b (12b ′) between the adjacent rack teeth 12a (12a ′) of the rack body 12 constituting the rack and pinion mechanism R. In the first to third rack bodies 12, after passing through the chip discharge passage 12c, the rack bodies 12 are discharged to the outside of the rack body 12 from a chip discharge port 12d formed on one or both side surfaces of the rack body 12. Further, in the rack body 12 ′ of the fourth embodiment, the chips L that have entered the recesses 12b ′ formed between the protrusions N that form the rack teeth 12a ′ are located on both sides and below the rack body 12 ′. Each formed chip discharge port 12d ′ is quickly discharged to the outside of the rack body 12 ′.

  Therefore, the rack and pinion mechanism R synchronously slides the pair of arm bodies A in the opposite directions by the same amount, and the distance between the pair of blade bodies K attached to the opposite ends of the pair of arm bodies A (D ) Is changed to adjust the drilling diameter (D) of the through hole B drilled in the wall plate, the chip L is not deposited in the recess 12b (12b ′) of the rack body 12 (12 ′). Therefore, the rack and pinion mechanism R operates smoothly and can perform the adjustment work without any trouble.

  Moreover, the said Example is equipped with a pair of arm body A, each arm body A is synchronously slid in the reverse direction by the rack and pinion mechanism R, and each blade body K attached to each arm body A is provided. Although the configuration is such that the perforation diameter is adjusted by changing the interval, the present invention can be applied to a perforation tool having only one arm body, that is, only one blade body.

Further, the above embodiment, since the center axis S with respect to the drive shaft supporting the holder H ₁ with a pair of blade K is configured to advance and retreat together, permeable to the wall plate by a pair of blade K In the middle of drilling the hole, the center portion is also drilled by the drill portion 24 of the center shaft S. However, the center shaft moves forward together with the pair of blades until the drilling is started by the pair of blades K, and after the center position is determined by contacting the wall plate, The shaft is in contact with the wall plate and remains in the center position, and does not move any further, i.e., without drilling the wall plate, only a pair of blades move forward and drill a through hole. The present invention can also be implemented.

It is the perspective view which fractured | ruptured a part of punching tool C based on this invention. It is also a plan view. It is a front sectional view similarly. Is an exploded perspective view of a main part of the piercer C (portion excluding the drive shaft supporting the holder H ₁ and cover V). FIG. 4 is a perspective view of a state in which a pair of arm bodies A are slidably attached to the arm body attaching holder H ₂ by the same amount in opposite directions via a rack and pinion mechanism R and a fastening bolt 41. 3 is an exploded perspective view of a rack and pinion mechanism R. FIG. It is the XX sectional view taken on the line of FIG. It is the YY sectional view taken on the line of FIG. (A) and (B) are a partial perspective view and a cross-sectional view of the rack body 12 in which the chip discharge passage 12c is formed with one inclined surface, respectively. (A) and (B) are a partial perspective view and a transverse cross-sectional view of the rack body 12 in which the chip discharge passage 12c is formed with a mountain-shaped inclined surface, respectively. (A) and (B) are a partial perspective view and a cross-sectional view of the rack body 12 in which the recess 12b between the rack teeth 12a is formed deeply. (A) and (B) are a partial perspective view and a partial side view of the rack body 12 ′ in which the rack teeth 12 a ′ are each composed of independent protrusions N. It is a perspective view of the state which is performing the drilling operation | work with the punch C which concerns on this invention.

Explanation of symbols

A: Arm body
C: Drilling tool
D: Distance between a pair of blades (perforation diameter)
H ₁ : Drive shaft support holder
H ₂ : Arm attachment holder
K: Blade
N: Protrusions that form rack teeth
PU: Pinion unit
S: Center axis
11: Arm body
12, 12 ': Rack body
12a, 12a ': rack teeth
12b, 12b ′: recess
12c: Chip discharge passage
12d, 12d ': Chip outlet
26: Pinion shaft
27: Pinion

Claims (4)

A punching tool comprising a center shaft, an arm body that extends in a direction perpendicular to the axial direction of the center shaft, and is slidable in the extending direction; and a blade body attached to the arm body. And
The arm body has a rack body having concave and convex rack teeth continuous along the extending direction of the arm body, and slides along the extending direction by rotation of a pinion meshing with the rack teeth. The diameter of drilling by the blade body can be adjusted,
In the rack body, the chip generated by drilling the blade body is prevented from being clogged in the recesses between the rack teeth, and the chips in the recesses are passed through and discharged in the recesses. A chip discharge path provided in communication with the recess toward the opposite side of the rack teeth, and a side of the rack body or a rack to discharge the chips in the chip discharge path to the outside of the rack body A punching tool comprising: a chip discharge port provided in communication with the chip discharge path on the side facing the teeth. The chip discharge path is formed with an inclined surface inclined with respect to the width direction of the rack teeth in order to facilitate the discharge of the chips from the chip discharge port provided on the side of the rack body. The perforating tool according to claim 1, wherein The rack teeth extend from the side surface of the arm body at a predetermined interval along the extending direction of the arm body so that the chip discharge port is provided on both the side surface and the bottom surface of the rack body. The punching device according to claim 1, wherein the punching device is formed by a plurality of projecting portions protruding independently in a direction orthogonal to the direction. A pair of arm bodies, each rack attached to the pair of arm bodies and the pinion mesh with each other, and attached to each arm body by sliding the pair of arm bodies in the reverse direction by the rotation of the pinion. The drilling tool according to any one of claims 1 to 3, wherein a drilling diameter is adjustable by changing a distance between the pair of blades.

Images