Nibbler

Abstract

To improve the convenience of a nibbler having a chip collecting attachment.SOLUTION: The doubler includes a long punch extending in an axial direction and capable of reciprocating in the axial direction, a die having a first through hole into which a tip of the punch can be inserted, a die holder having a recess in which the die is accommodated, a tip portion located on a side farther from the punch than the recess in the axial direction, and a second through hole communicating with the first through hole, and a chip collecting attachment detachably attached to the tip portion of the die holder. The chip collecting attachment includes a cylindrical attachment portion configured to be attached to the tip end portion of the die holder, and a bottomed cylindrical housing portion that houses the chips guided through the first through hole, the second through hole, and the inside of the attachment portion. The outer diameter of the attachment portion and the outer diameter of the housing portion are substantially the same as the outer diameter of the tip end portion of the die holder.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a nibbler. [Background technology]

[0002] A nibbler is known as a type of power tool. The nibbler includes a long punch and a die held by a die holder and having a through hole into which the tip of the punch can be inserted. A plate-shaped workpiece is inserted between the die and the punch, and the punch is reciprocated to cut the workpiece between the edges of the die and the punch. By repeatedly cutting while gradually shifting the cutting position, a desired area of ​​the workpiece can be cut. A through hole (hereinafter also referred to as a processing start hole) can be formed in the workpiece using a hole saw, and the die holder can be inserted into the processing start hole until the workpiece is positioned between the die and the punch, thereby cutting so as to hollow out a portion of the workpiece.

[0003] In such a nibbler, chips generated by cutting are discharged from the tip of the die (the end opposite the die) through the through holes in the die and die holder. Patent Document 1 listed below discloses a technique for collecting such chips in a container. Specifically, a container is attached to the tip of the die holder (the end opposite the die) via an attachment. The chips are guided into the container through the through holes in the die and die holder. With this nibbler, chips do not scatter around, eliminating the need for cleaning and improving user convenience. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-21980 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the above-described nibbler leaves room for improvement in terms of convenience. For example, in the above-described nibbler, the outer diameter of the attachment and container (particularly the outer diameter of the container) is much larger than the outer diameter of the die holder. Therefore, when cutting so as to hollow out a portion of the workpiece, it is necessary to form a large machining start hole that is large enough for the attachment and container to pass through. To form such a large machining start hole, a hole saw with a large diameter is required. Furthermore, large hole saws are difficult to handle. For these reasons, it is expected that the convenience of nibblers equipped with chip collection attachments will be improved. [Means for solving the problem]

[0006] This specification discloses a nibbler. The nibbler may include: a long punch extending in an axial direction and capable of reciprocating in the axial direction; a die having a first through hole into which the tip of the punch can be inserted; a die holder having a recess for accommodating the die, a tip portion located farther from the punch in the axial direction than the recess, and a second through hole communicating with the first through hole; and a chip collecting attachment removably attached to the tip of the die holder. The chip collecting attachment may include a cylindrical mounting portion configured to be attached to the tip of the die holder and a bottomed cylindrical container portion for accommodating chips guided through the first through hole, the second through hole, and the interior of the mounting portion. The outer diameters of the mounting portion and the container portion may be approximately the same as the outer diameter of the tip of the die holder.

[0007] In this specification, the term "outer diameter" is not limited to the outer diameter of a member having a circular cross section, but is also used to refer to the thickness of a member having a non-circular cross section. In this case, the term "outer diameter" refers to the length of the longest straight line connecting any two points on the outer periphery of the non-circular cross section.

[0008] With this nibbler, the outer diameter of the attachment portion and the outer diameter of the housing portion are approximately the same as the outer diameter of the tip of the die holder. Therefore, when cutting a part of the workpiece by hollowing out, the machining start hole through which the die holder and housing portion must pass can be made smaller than with conventional nibblers. This allows the machining start hole to be formed using a smaller-diameter hole saw, improving user convenience.

[0009] This specification further discloses a nibbler. The nibbler may include: an elongated punch extending in an axial direction and capable of reciprocating in the axial direction; a die having a first through hole into which the tip of the punch can be inserted; a die holder having a recess for accommodating the die, a tip portion located axially farther from the punch than the recess, a second through hole communicating with the first through hole, and a first mounting hole extending in the axial direction; and a chip collecting attachment removably attached to the tip portion of the die holder. The die may have a second mounting hole coaxial with the first mounting hole and be configured to be attached to the die holder by bolts inserted from the tip portion of the die holder into the first mounting hole and the second mounting hole. The chip collecting attachment may include a cylindrical mounting portion configured to be attached to the tip of the die holder, and a bottomed cylindrical container portion that communicates with the interior of the mounting portion and contains chips guided through the first through hole, the second through hole, and the mounting portion. The mounting portion may include a cylindrical outer periphery and a bottom portion having a third through hole that communicates with the second through hole and a third mounting hole coaxial with the first and second mounting holes. The mounting portion may be attached to the tip of the die holder by fastening the third, first, and second mounting holes together with bolts inserted from the interior of the mounting portion into the third, first, and second mounting holes.

[0010] With this nibbler, the chip collecting attachment can be attached using the first mounting hole in the die holder, the second mounting hole in the die, and the bolts. These are components that the nibbler originally has for attaching the die to the die holder. Therefore, the configuration for attaching the chip collecting attachment to the nibbler can be simplified. Furthermore, the user can easily attach the chip collecting attachment with just a simple operation (tightening the attachment with bolts), improving user convenience. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a perspective view of a nibbler according to one embodiment, with a chip collection attachment attached to a die holder of the nibbler. [Figure 2] FIG. 1 is a perspective view of a nibbler with the chip collection attachment removed. [Figure 3] FIG. 1 is a perspective view of a nibbler with the chip collection attachment removed. [Figure 4] FIG. 1 is a longitudinal cross-sectional view of a nibbler. [Figure 5] FIG. 10 is a partially enlarged perspective view of the nibbler showing the periphery of the die holder. [Figure 6] FIG. 1 is a perspective view of a chip collection attachment. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 10 is a partially enlarged left side view of the nibbler showing the periphery of the die holder. [Figure 10] FIG. 10 is a partial cross-sectional view taken along line AA in FIG. 9. [Figure 11] FIG. 11 is a partial cross-sectional view of the chip collecting attachment when not attached, corresponding to FIG. 10 . DETAILED DESCRIPTION OF THE INVENTION

[0012] Representative, non-limiting embodiments of the present invention will now be described in detail with reference to the accompanying drawings. This detailed description is intended simply to provide those skilled in the art with details for implementing preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Additionally, additional features and inventions disclosed below may be used separately or in conjunction with other features and inventions to provide further improved devices, methods of making and using the same.

[0013] Furthermore, the combinations of features and steps disclosed in the following detailed description are not essential to practicing the invention in its broadest sense, but are described solely to illustrate specific exemplary embodiments of the invention. Furthermore, the various features of the exemplary embodiments described above and below, and those described in the independent and dependent claims, do not necessarily have to be combined in the exact embodiments described herein, or in the exact order listed, to provide additional and useful embodiments of the invention.

[0014] All features described in this specification and / or claims are intended to be disclosed individually and independently of one another as limitations on the original disclosure and claimed particulars, apart from any configuration of the features described in the embodiments and / or claims. Furthermore, all numerical ranges and group or aggregation descriptions are intended to disclose intermediate configurations thereof as limitations on the original disclosure and claimed particulars.

[0015] In one or more embodiments, when the outer diameter of the attachment portion is defined as D1 (mm), the outer diameter of the accommodation portion is defined as D2 (mm), and the outer diameter of the tip portion of the die holder is defined as D3 (mm), the relationships D1 ≦ D3 + 6 mm and D2 ≦ D3 + 6 mm may be satisfied. This configuration allows the machining start hole to be made smaller, improving user convenience.

[0016] In one or more embodiments, when the outer diameter of the attachment portion is defined as D1 (mm), the outer diameter of the housing portion is defined as D2 (mm), and the outer diameter of the tip portion of the die holder is defined as D3 (mm), the relationships D1 ≦ D2 + 3 mm and D2 ≦ D3 + 3 mm may be satisfied. This configuration allows the machining start hole to be made smaller.

[0017] In one or more embodiments, the outer diameter of the attachment portion and the outer diameter of the housing portion may be equal to or smaller than the outer diameter of the tip of the die holder. This configuration allows for a smaller starting hole. In other words, the cutting can be performed by hollowing out a portion of the workpiece using a starting hole of the same size as when the chip collection attachment is not attached.

[0018] In one or more embodiments, the die holder may have a first mounting hole extending in the axial direction. The die may have a second mounting hole coaxial with the first mounting hole and be configured to be attached to the die holder by bolts inserted from the tip of the die holder into the first and second mounting holes. The mounting portion may have a cylindrical outer periphery and a bottom portion having a third through hole communicating with the second through hole and a third mounting hole coaxial with the first and second mounting holes. The mounting portion may be attached to the tip of the die holder by being fastened together with bolts inserted from the inside of the mounting portion into the third mounting hole, the first mounting hole, and the second mounting hole. With this configuration, a chip collection attachment can be attached using the first mounting hole of the die holder, the second mounting hole of the die, and the bolts. These are components originally provided in the nibbler for attaching the die to the die holder. Therefore, the structure for attaching the chip collecting attachment to the nibbler can be simplified. Also, the user can easily attach the chip collecting attachment with just a simple operation (tightening the attachment with bolts), improving user convenience. Furthermore, the die holder and the attachment part are tightly sealed, so chips do not spill out through the gap between them.

[0019] In one or more embodiments, the outer periphery of the mounting portion may have a radially penetrating notch adjacent to the bottom and the bolt. The head of the bolt may be partially located within the notch. With this configuration, the mounting portion can be positioned so that the head of the bolt is partially located radially outward of the inner surface of the outer periphery of the mounting portion. In other words, it is not necessary to increase the outer diameter of the outer periphery to prevent interference between the head of the bolt and the inner surface of the outer periphery. Therefore, the outer diameter of the mounting portion can be smaller than when the outer periphery does not have a notch, and as a result, the drilling start hole can be made smaller.

[0020] In one or more embodiments, the mounting portion and the storage portion may be separate components. The storage portion may be attached to the mounting portion by fitting into the mounting portion. When the storage portion is attached to the mounting portion, the storage portion may partially cover the notch. This configuration allows a user to change the storage portion depending on the situation (e.g., the desired chip storage capacity). Furthermore, when the nibbler is used in an orientation in which the chip collection attachment is positioned vertically above the die holder, chips can be prevented from spilling out of the notch.

[0021] In one or more embodiments, the housing portion may be flexible. With this configuration, even when the portion from the housing portion to the tip end of the die holder is inserted into a narrow space (for example, a small-diameter duct), the housing portion can bend to fit the shape of the insertion location, thereby minimizing restrictions on the location where the nibbler can be used and ensuring a large chip storage capacity for the housing portion.

[0022] In one or more embodiments, the storage portion may be in the form of a plastic tube. This configuration makes it difficult for chips stored in the storage portion to get caught on the inner surface of the storage portion. Therefore, when the chips stored in the storage portion are disposed of, the chips can be smoothly discharged. Furthermore, plastic tubes are inexpensive, which reduces the cost of the chip collection attachment. Furthermore, a user can adjust the storage portion to a desired length and capacity by cutting the plastic tube at a desired position.

[0023] In one or more embodiments, the storage unit may be transparent enough to allow the user to visually check the state of chip storage therein. This configuration allows the user to visually check the amount of chips accumulated in the storage unit. This allows the user to appropriately determine the timing to discharge the chips accumulated in the storage unit. In other words, the user can easily determine how much longer they can continue working without discharging the chips accumulated in the storage unit.

[0024] In one or more embodiments, the mounting portion and the storage portion may be separate components. The storage portion may be attached to the mounting portion by being fitted into the mounting portion. The storage portion may include a bottomless tubular storage portion main body and a lid member that fits into an opening of the storage portion main body to close the opening. The engagement between the storage portion and the lid member through fitting may require less force to disengage than the engagement between the storage portion and the mounting portion through fitting. With this configuration, when discharging chips accumulated in the storage portion, the lid member can be easily removed without disengaging the engagement between the storage portion and the mounting portion through fitting. This makes it easy to discharge chips.

[0025] A nibbler 10 according to a representative but non-limiting embodiment of the present disclosure will be described in more detail below with reference to the drawings. As shown in FIG. 1, the nibbler 10 includes a nibbler body 15 and a chip collection attachment 100 (hereinafter simply referred to as the attachment 100). An overview of the nibbler body 15 will be described below. Since the nibbler body 15 is well known, only a brief description will be given. As shown in FIGS. 2 and 3, the nibbler body 15 includes a housing 20, a battery 16, a punch 30, a die holder 40, a die 50, and two bolts 60.

[0026] The housing 20 has a long, cylindrical shape. A battery 16, which serves as the power source for the nibbler body 15, is attached to one longitudinal end of the housing 20. A long die holder 40 extends from the other longitudinal end of the housing 20. The die holder 40 extends in a direction perpendicular to the longitudinal direction of the housing 20. For convenience, in the following description, the longitudinal direction of the housing 20 is defined as the front-to-rear direction of the nibbler 10. In the front-to-rear direction, the side on which the die holder 40 is located is defined as the front side of the nibbler 10, and the side on which the battery 16 is located is defined as the rear side of the nibbler 10. The longitudinal direction of the die holder 40 is defined as the up-to-down direction of the nibbler 10. In the up-to-down direction, the side on which the housing 20 is located is defined as the upper side of the nibbler 10, and the opposite side is defined as the lower side of the nibbler 10. The direction perpendicular to the front-to-rear direction and the up-to-down direction is defined as the left-to-right direction of the nibbler 10. In the left-to-right direction, the right side when viewed from the rear to the front is defined as the right side of the nibbler 10, and the opposite side is defined as the left side of the nibbler 10.

[0027] As shown in FIG. 4 , various components of the nibbler body 15 are accommodated inside the housing 20. An electric motor 21 is accommodated in approximately the center of the housing 20. The electric motor 21 provides rotational driving force using power provided by the battery 16. The electric motor 21 has a motor shaft 22 extending in the front-to-rear direction. The rotational driving force of the electric motor 21 is transmitted to a crankshaft 24 via the motor shaft 22 and a spur gear 23. The crankshaft 24 passes through a rod 26 extending in the vertical direction and is connected to the rod 26 via a needle bearing 25. The connection point of the crankshaft 24 with the rod 26 is eccentric with respect to the rotational axis of the crankshaft 24. Therefore, the rotational motion of the crankshaft 24 is converted into vertical reciprocating motion of the rod 26.

[0028] As shown in Figure 4, the die holder 40 has a generally cylindrical shape extending in the vertical direction. The die holder 40 is fixed to the front and lower cylindrical portion of the housing 20 by a lock nut 29. A ram 27, a punch holder 28, and a punch 30 are housed inside the die holder 40. The rod 26 is connected to the punch holder 28 via the ram 27. The punch holder 28 holds an elongated punch 30. The punch 30 extends in the vertical direction (in the direction of its own axis). The punch 30 can also reciprocate in the vertical direction as the rod 26 reciprocates in the vertical direction.

[0029] As shown in Figures 4 and 9, the die holder 40 has a recess 42 near its lower end. The recess 42 is formed by cutting out the front and side portions (right and left portions) of the die holder 40. The portion of the die holder 40 below the recess 42 (in other words, the portion farther from the punch 30 than the recess 42) is called a tip portion 43. The tip portion 43 has a second through-hole 41 extending in the vertical direction.

[0030] As shown in FIG. 4, a die 50 is housed in the recess 42. The die 50 is fixed to the die holder 40 by two bolts 60 (see FIGS. 2 and 3) (details will be described later). The die 50 has a first through hole 51 extending in the vertical direction. This first through hole 51 communicates with the second through hole 41 of the die holder 40. The tip (lower end) of the punch 30 is exposed in the recess 42 and can be inserted into the first through hole 51. When the punch 30 is at its top dead center, a gap is formed between the tip of the punch 30 and the upper edge of the die 50 (not shown). When the punch 30 is at its bottom dead center, the tip of the punch 30 is inserted into the first through hole 51 of the die 50.

[0031] When performing a cutting operation using the nibbler body 15, the punch 30 is at its top dead center, and a plate-shaped workpiece is inserted into the gap between the tip of the punch 30 and the die 50. To cut from the edge of the workpiece, the edge can be inserted between the tip of the punch 30 and the die 50. To cut a portion of the workpiece by hollowing it out, the user first creates a starting hole with a hole saw. The user then inserts the tip 43 of the die holder 40 into the starting hole and then inserts the cutting area between the tip of the punch 30 and the die 50. When the electric motor 21 is driven in this state, the punch 30 moves from the top dead center to the bottom dead center. At this time, the workpiece is sheared between the edge of the tip of the punch 30 and the edge of the die 50 (the portion defining the upper edge of the first through-hole 51). While the punch 30 repeatedly reciprocates, the user can gradually change the cutting position to cut (or hollow out) a desired area of ​​the workpiece. Chips generated during such cutting operation are discharged to the outside through the first through-hole 51 of the die 50 and the second through-hole 41 of the tip portion 43 of the die holder 40 .

[0032] The structure for attaching the die 50 to the die holder 40 will be described below. As shown in FIG. 11 , the die holder 40 has two first mounting holes 44 extending in the vertical direction. The first mounting holes 44 penetrate the tip portion 43 of the die holder 40. The two first mounting holes 44 are arranged symmetrically. In this embodiment, the inner surface defining the first mounting holes 44 has a female thread. However, the inner surface does not have to have a female thread. The die 50 has two second mounting holes 52 extending in the vertical direction. The second mounting holes 52 penetrate the die 50. The two second mounting holes 52 are coaxial with the two first mounting holes 44, respectively. The inner surface defining the second mounting holes 52 has a female thread.

[0033] When attaching the die 50 to the die holder 40, as shown in FIG. 11 , two bolts 60 are inserted into the two first mounting holes 44 and the two second mounting holes 52 from the tip 43 of the die holder 40 (in other words, from the bottom), and the bolts 60 are tightened. As a result, the tip 43 is sandwiched between the die 50, which is threaded onto the bolts 60, and the head of the bolts 60, and the die 50 is fixed to the die holder 40. This type of attachment structure is also used in conventional nibblers. When replacing the die holder 40, the die holder 40 can be removed by removing the two bolts 60.

[0034] A chip collecting attachment 100 can be removably attached to the nibbler body 15 to collect chips generated during cutting by the nibbler body 15 without scattering them to the outside. As shown in FIG. 1, the attachment 100 is attached to the tip 43 of the die holder 40. Specifically, as shown in FIGS. 1, 6, and 7, the attachment 100 includes a mounting portion 110 and a storage portion 120.

[0035] As shown in FIGS. 6 and 7, the mounting portion 110 has a substantially cylindrical shape. Specifically, the mounting portion 110 includes a cylindrical outer peripheral portion 111 and a bottom portion 112 that partially covers the upper opening of the outer peripheral portion 111. In this embodiment, the outer peripheral portion 111 has a cylindrical shape. The outer diameter of the outer peripheral portion 111 is substantially equal to the outer diameter of the tip portion 43 of the die holder 40. In this embodiment, the outer diameter of the outer peripheral portion 111 is the same as the outer diameter of the tip portion 43. The bottom portion 112 has the same outer diameter as the outer peripheral portion 111. As shown in FIG. 8, an inner surface 116 of the outer peripheral portion 111 has a plurality of ribs 117. The ribs 117 protrude radially inward from the inner surface 116 and extend elongatedly in the vertical direction.

[0036] In this embodiment, the outer peripheral portion 111 is made of a resin material. Furthermore, the bottom portion 112 includes a metal portion 112a and a resin portion 112b. The outer peripheral portion 111 and the bottom portion 112 are integrally molded by injection molding. That is, the outer peripheral portion 111 and the resin portion 112b are integrally molded from the same resin material. The metal portion 112a has two third mounting holes 113 and a third through hole 114. The third mounting holes 113 and the third through hole 114 each penetrate the metal portion 112a in the vertical direction. The two third mounting holes 113 are coaxial with the first mounting hole 44 of the die holder 40 and the second mounting hole 52 of the die 50. The third through hole 114 communicates with the second through hole 41 of the die holder 40.

[0037] In this embodiment, the thickness of the bottom portion 112 is 1 mm. By making the thickness of the bottom portion 112 thick enough that the bolt 60 used in the mounting structure of the die 50 of an existing nibbler (see FIG. 11) can be threaded into the female thread of the die 50, it is possible to use the conventional bolt 60 for mounting the mounting portion 110. However, a longer dedicated bolt for mounting the mounting portion 110 may also be prepared.

[0038] 6 and 7, the outer circumferential portion 111 has two notches 115. The two notches 115 are adjacent to the bottom portion 112 and penetrate the outer circumferential portion 111 in the radial direction. The circumferential positions of the two notches 115 correspond to the circumferential positions of the two third mounting holes 113, respectively.

[0039] The mounting portion 110 is attached to the tip portion 43 of the die holder 40 as follows. As shown in FIG. 10 , the user first positions the mounting portion 110 so that the lower edge of the tip portion 43 abuts the bottom portion 112. Next, the user inserts the bolt 60 from the inside (from below) of the mounting portion 110 into the third mounting hole 113 of the mounting portion 110, the first mounting hole 44 of the die holder 40, and the second mounting hole 52 of the die 50, and tightens the bolt 60. As a result, the mounting portion 110 is fastened together with the die holder 40 and the die 50 by the bolt 60 and fixed to the die holder 40. With this configuration, the mounting portion 110 can be easily attached to the die holder 40 by utilizing the mounting structure for the die 50 shown in FIG. 11 . Furthermore, the mounting structure for the mounting portion 110 can be simplified. The portion of bottom 112 of mounting portion 110 that is pressed by the head of bolt 60 is metal portion 112a, so it is easy to ensure the strength to withstand this pressing force. However, the entire mounting portion 110, including bottom 112, may be made of resin. Alternatively, the entire mounting portion 110 may be made of metal. In this case, the entire mounting portion 110 may be formed by drawing.

[0040] 1 and 10 , the notch 115 is adjacent to the bolt 60, and the head of the bolt 60 is partially located within the notch 115. In other words, as shown in FIG. 10 , the head of the bolt 60 is partially located radially outward of the inner surface 116 of the outer circumferential portion 111. Because the outer circumferential portion 111 has the notch 115, the bolt 60 can be inserted and tightened without interfering with the inner surface 116 of the outer circumferential portion 111. With this configuration, interference between the head of the bolt 60 and the inner surface 116 of the outer circumferential portion 111 can be avoided without increasing the outer diameter of the outer circumferential portion 111.

[0041] As shown in FIGS. 1 and 7 , the storage section 120 is a bottomed, cylindrical member for storing chips and is separate from the mounting section 110. In this embodiment, the storage section 120 includes a storage section main body 130 and a lid member 140. The storage section main body 130 has a bottomless cylindrical shape extending in the vertical direction. In this embodiment, the storage section main body 130 is in the form of a flexible resin tube. The outer diameter of the storage section main body 130 is slightly smaller than the inner diameter of the mounting section 110 (inner surface 116). Furthermore, the inner diameter of the portion of the mounting section 110 where the rib 117 is formed is slightly larger than the outer diameter of the storage section main body 130. Therefore, by utilizing the elasticity of the storage section main body 130 in the form of a resin tube, one end (upper end) of the storage section main body 130 can be fitted (press-fit) into the mounting section 110. With this configuration, the storage section main body 130 can be removably attached to the mounting section 110.

[0042] As shown in FIG. 7 , the lid member 140 includes a tubular portion 141, a flange 142, and a knob portion 143. The tubular portion 141 has a cylindrical shape extending in the vertical direction. The outer peripheral surface of the tubular portion 141 has a plurality of ribs 144. The ribs 144 protrude radially outward from the outer peripheral surface of the tubular portion 141 and extend in an elongated manner in the vertical direction. The outer diameter of the portion of the tubular portion 141 where the ribs 144 are formed is slightly larger than the inner diameter of the storage body 130. Therefore, the elasticity of the storage body 130, which is in the form of a resin tube, can be utilized to fit (press-fit) the tubular portion 141 into the storage body 130. With this configuration, the lid member 140 can be removably attached to the storage body 130 to close the lower opening of the storage body 130.

[0043] The flange 142 is located below the tubular portion 141 and defines the bottom of the tubular portion 141. The flange 142 has an outer diameter larger than the tubular portion 141 (the outer diameter of the portion where the rib 144 is formed), and functions as a stopper that abuts against the storage body 130 when the tubular portion 141 is fitted into the storage body 130. The knob portion 143 is located below the flange 142 and has a truncated cone shape. A user can easily attach and detach the lid member 140 by holding the knob portion 143 with their fingers. In this embodiment, the outer diameters of the flange 142 and the knob portion 143 are the same as the outer diameter of the storage body 130.

[0044] When the nibbler 10 is used with the storage unit 120 attached to the mounting unit 110, the chips are guided into the storage unit main body 130 via the first through-hole 51 of the die 50, the second through-hole 41 of the die holder 40, and the third through-hole 114 of the mounting unit 110, and are stored therein. When the storage unit main body 130 is full of chips, the user can remove the lid member 140 to discharge and discard the chips. In this embodiment, the storage unit main body 130 is made of a transparent material that allows the user to visually check the state of chip storage inside. This allows the user to visually check the amount of chips accumulated in the storage unit main body 130. This allows the user to appropriately determine the timing to discharge the chips accumulated in the storage unit main body 130.

[0045] Furthermore, according to the attachment 100, the mounting portion 110, the storage portion 120, and the storage portion main body 130 are configured so that the engagement between the storage portion main body 130 and the lid member 140 requires less force to disengage than the engagement between the storage portion main body 130 and the mounting portion 110. Therefore, when discharging chips accumulated in the storage portion main body 130, the lid member 140 can be easily removed without disengaging the engagement between the storage portion main body 130 and the mounting portion 110. This makes it easy to discharge chips. The engagement force between the storage portion main body 130 and the lid member 140 and the engagement force between the storage portion main body 130 and the mounting portion 110 can be adjusted by varying at least one of the height and length of the rib 117 of the mounting portion 110 and the rib 144 of the lid member 140. In an alternative embodiment, the mounting portion 110 may not have the rib 117, and the tubular portion 141 may not have the rib 144. In this case, the difference between the outer diameter of the tubular portion 141 and the inner diameter of the housing body 130 may be larger than the difference between the outer diameter of the housing body 130 and the inner diameter of the mounting portion 110. A similar effect can be obtained with such a configuration.

[0046] According to the above-described nibbler 10, the outer diameters of the mounting portion 110 and the housing portion 120 of the attachment 100 are the same as the outer diameter of the tip portion 43 of the die holder 40. Therefore, when cutting a workpiece by hollowing out a portion thereof, the machining start hole through which the die holder 40 and the housing portion 120 must be inserted can be made smaller than with conventional nibblers. In other words, the attachment 100 and the tip portion 43 of the die holder 40 can be inserted into a machining start hole of the same size as when the attachment 100 is not used, and cutting can be performed. Therefore, compared to conventional nibblers in which the outer diameter of the chip collection attachment is much larger than the tip portion 43, a smaller-diameter hole saw can be used to form the machining start hole. As a result, user convenience is improved.

[0047] In other words, in this embodiment, the outer diameters of the mounting portion 110 and the accommodation portion 120 are smaller than the diameter of the machining start hole. When the attachment 100 is not used, the diameter of the machining start hole is typically 21 mm. Therefore, even when the attachment 100 is used, the user can form the machining start hole using a hole saw for 21 mm holes that they already own, and insert the attachment 100 and the tip portion 43 of the die holder 40 into the machining start hole.

[0048] In an alternative embodiment, the mounting portion 110 may not have the notch 115. In this case, the outer diameter of the mounting portion 110 may be large enough so that the bolt 60 does not interfere with the inner surface 116 of the outer peripheral portion 111. In this case, when the outer diameter is defined as D1 (mm), the outer diameter of the accommodation portion 120 is defined as D2 (mm), and the outer diameter of the tip portion 43 of the die holder 40 is defined as D3 (mm), the thickness of the outer peripheral portion 111 may be set to satisfy D1 ≦ D2 + 3 mm and D2 ≦ D3 + 3 mm. In a further alternative embodiment, D1 ≦ D3 + 6 mm and D2 ≦ D3 + 6 mm may be satisfied. These alternative embodiments also allow the machining start hole to be smaller than that of conventional nibblers.

[0049] Furthermore, according to the nibbler 10, the attachment portion 110 and the storage portion 120 are separate members. This allows the user to replace the storage portion main body 130 with one of the desired length (capacity) depending on the situation. However, the attachment portion 110 and the storage portion 120 may be an integral, non-detachable part. In this case, the bolt 60 may be inserted from the bottom end of the storage portion main body 130 and tightened using a longer tool.

[0050] 10, when the storage section 120 is attached to the mounting section 110, the upper end of the storage section main body 130 partially covers the notch 115. This configuration makes it possible to prevent chips from spilling out of the notch 115 when the nibbler 10 is used in a position where the bottom side of the nibbler 10 is positioned vertically above (in other words, a position where the attachment 100 is positioned vertically above the die holder 40).

[0051] Furthermore, according to the nibbler 10, the storage body 130 is flexible, so even when the attachment 100 and the tip 43 of the die holder 40 are inserted into a narrow space (for example, inside a small-diameter duct), the storage body 130 can bend to fit the shape of the insertion location. Therefore, it is possible to ensure a large chip storage capacity for the storage part 120 while minimizing restrictions on where the nibbler 10 can be used.

[0052] Furthermore, according to the nibbler 10, the housing body 130 is in the form of a resin tube. Therefore, chips stored in the housing body 130 are less likely to get caught on the inner surface of the housing body 130. Therefore, when discarding the chips stored in the housing body 130, the chips can be smoothly discharged. Furthermore, resin tubes are inexpensive, which reduces the cost of the attachment 100. Furthermore, the user can adjust the chip storage capacity of the housing body 130 to a desired amount by cutting the resin tube at a desired position. Alternatively, the size of the housing body 130 can be adjusted according to the width of the insertion location of the housing body 130.

[0053] Although the embodiments have been described above, the above-described embodiments are intended to facilitate understanding of the present teachings and are not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and the present invention includes equivalents thereof. Furthermore, any combination or omission of each component described in the claims and specification is possible within the scope of solving at least part of the above-described problems or achieving at least part of the effects.

[0054] For example, the shapes and configurations of the components of the nibbler 10 described above are merely examples, and any changes are possible as long as the functions of the components are ensured. For example, the shape of the mounting portion 110 and / or the housing body 130 is not limited to a cylindrical shape, and may be any cylindrical shape.

[0055] Alternatively, a cylindrical member with a bottom and one longitudinal end closed may be used instead of the storage portion 120. In this case, by removing the cylindrical member from the attachment portion 110, chips accumulated inside the cylindrical member can be discharged.

[0056] Alternatively, the container body 130 may be a tubular member of any form. For example, the container body 130 may be in the form of a flexible bellows hose. In this case, the user may extend or contract the container body 130 depending on the desired chip storage capacity or the size of the insertion location of the container body 130. Alternatively, the container body 130 may be in the form of a hard plastic tube.

[0057] The correspondence between the components of the above embodiment and the components of the claims is shown below. However, the components of the embodiment are merely examples and do not limit the components of the present invention. The nibbler 10 is an example of a "nibbler." The punch 30 is an example of a "punch." The die holder 40 is an example of a "die holder." The second through hole 41 is an example of a "second through hole." The recess 42 is an example of a "recess." The tip 43 is an example of a "tip." The first mounting hole 44 is an example of a "first mounting hole." The die 50 is an example of a "die." The first through hole 51 is an example of a "first through hole." The second mounting hole 52 is an example of a "second mounting hole." The bolt 60 is an example of a "bolt." The chip collecting attachment 100 is an example of a "chip collecting attachment." The mounting portion 110 is an example of a "mounting portion." The outer peripheral portion 111 is an example of an "outer peripheral portion." The bottom portion 112 is an example of a "bottom portion." The third mounting hole 113 is an example of a "third mounting hole." The third through hole 114 is an example of a "third through hole." The notch 115 is an example of a "notch." The storage portion 120 is an example of a "storage portion." The storage portion main body 130 is an example of a "storage portion main body." The lid member 140 is an example of a "lid member." [Explanation of symbols]

[0058] 10... Nibbler 15... Nibbler body 16...Battery 20...Housing 21...Electric motor 22...Motor shaft 23...Spur gear 24...Crankshaft 25...Needle bearing 26...Rod 27...Rum 28...Punch holder 29...Lock nut 30...Punch 40...Die holder 41...Second through hole 42...recess 43...Tip 44...First mounting hole 50...dice 51...First through hole 52...Second mounting hole 60...volts 100...Chip collection attachment 110...Mounting part 111...Outer periphery 112...bottom 112a...metal part 112b...Resin part 113...Third mounting hole 114...Third through hole 115...notch 116...Inside 117...Rib 120...Storage section 130...Main body of storage unit 140...Cover member 141...cylindrical part 142...Flange 143...knob section 144...Rib

Claims

1. Nibbler, an elongated punch extending in an axial direction and capable of reciprocating in the axial direction; a die having a first through hole into which the tip of the punch can be inserted; a die holder having a recess for accommodating the die, a tip portion located farther from the punch than the recess in the axial direction, and a second through hole communicating with the first through hole; a chip collecting attachment removably attached to the tip of the die holder; Equipped with The chip collection attachment comprises: a cylindrical mounting portion configured to be attached to the tip end portion of the die holder; a bottomed cylindrical storage portion that stores the chips guided through the first through hole, the second through hole, and the inside of the mounting portion; Equipped with The outer diameter of the attachment portion and the outer diameter of the accommodation portion are approximately the same as the outer diameter of the tip portion of the die holder. Nibbler.

2. 10. The nibbler of claim 1, When the outer diameter of the attachment portion is defined as D1 (mm), the outer diameter of the accommodation portion is defined as D2 (mm), and the outer diameter of the tip portion of the die holder is defined as D3 (mm), D1≦D3+6 mm and D2≦D3+6 mm are satisfied. Nibbler.

3. 10. The nibbler of claim 1, When the outer diameter of the attachment portion is defined as D1 (mm), the outer diameter of the accommodation portion is defined as D2 (mm), and the outer diameter of the tip portion of the die holder is defined as D3 (mm), D1≦D2+3 mm and D2≦D3+3 mm are satisfied. Nibbler.

4. 10. The nibbler of claim 1, The outer diameter of the attachment portion and the outer diameter of the accommodation portion are equal to or smaller than the outer diameter of the tip portion of the die holder. Nibbler.

5. 5. The nibbler of claim 1, further comprising: the die holder has a first mounting hole extending in the axial direction, The die is a second mounting hole coaxial with the first mounting hole; the die holder is configured to be attached to the die holder by bolts inserted from the tip end of the die holder into the first attachment hole and the second attachment hole, The mounting portion is A cylindrical outer periphery; a bottom portion having a third through hole communicating with the second through hole and a third mounting hole coaxial with the first mounting hole and the second mounting hole; Equipped with The die holder is attached to the tip end portion of the die holder by fastening the third mounting hole, the first mounting hole, and the second mounting hole together with the bolts inserted from inside the mounting portion. Nibbler.

6. 6. The nibbler of claim 5, the outer periphery of the mounting portion has a notch that penetrates radially adjacent to the bottom and the bolt, The head of the bolt is partially located within the notch. Nibbler.

7. 7. The nibbler of claim 6, the mounting portion and the accommodating portion are separate members, the accommodation portion is attached to the attachment portion by being fitted into the attachment portion; When the accommodation portion is attached to the attachment portion, the accommodation portion partially covers the notch. Nibbler.

8. 8. The nibbler of claim 1, further comprising: The housing portion is flexible. Nibbler.

9. 9. The nibbler of claim 8, The container is in the form of a resin tube. Nibbler.

10. 10. The nibbler of claim 1, further comprising: The storage section is transparent to the extent that the state of storage of the chips inside can be visually confirmed. Nibbler.

11. 11. The nibbler of claim 1, the mounting portion and the accommodating portion are separate members, the accommodation portion is attached to the attachment portion by being fitted into the attachment portion; The storage section is A bottomless cylindrical storage body, a cover member that is fitted into the opening of the housing body to close the opening; Equipped with The engagement between the accommodation portion and the cover member by fitting requires a smaller force to disengage than the engagement between the accommodation portion and the attachment portion by fitting. Nibbler.

12. Nibbler, an elongated punch extending in an axial direction and capable of reciprocating in the axial direction; a die having a first through hole into which the tip of the punch can be inserted; a die holder having a recess for accommodating the die, a tip portion located farther from the punch than the recess in the axial direction, a second through hole communicating with the first through hole, and a first mounting hole extending in the axial direction; a chip collecting attachment removably attached to the tip of the die holder; Equipped with The die is a second mounting hole coaxial with the first mounting hole; the die holder is configured to be attached to the die holder by bolts inserted from the tip end of the die holder into the first attachment hole and the second attachment hole, The chip collection attachment comprises: a cylindrical mounting portion configured to be attached to the tip end portion of the die holder; a bottomed cylindrical storage portion that communicates with the inside of the mounting portion and stores the chips that are guided through the first through hole, the second through hole, and the mounting portion; Equipped with The mounting portion is A cylindrical outer periphery; a bottom portion having a third through hole communicating with the second through hole and a third mounting hole coaxial with the first mounting hole and the second mounting hole; Equipped with The die holder is attached to the tip end portion of the die holder by fastening the third mounting hole, the first mounting hole, and the second mounting hole together with the bolts inserted from inside the mounting portion. Nibbler.

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