EP1078719A2 - Tang break-off tool - Google Patents

Tang break-off tool Download PDF

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Publication number
EP1078719A2
EP1078719A2 EP00300112A EP00300112A EP1078719A2 EP 1078719 A2 EP1078719 A2 EP 1078719A2 EP 00300112 A EP00300112 A EP 00300112A EP 00300112 A EP00300112 A EP 00300112A EP 1078719 A2 EP1078719 A2 EP 1078719A2
Authority
EP
European Patent Office
Prior art keywords
tang
tool
break
spiral coil
coil insert
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00300112A
Other languages
German (de)
French (fr)
Inventor
Fusahide Hondo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NIPPON SPREW CO Ltd
Original Assignee
NIPPON SPREW CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NIPPON SPREW CO Ltd filed Critical NIPPON SPREW CO Ltd
Publication of EP1078719A2 publication Critical patent/EP1078719A2/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/143—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same for installing wire thread inserts or tubular threaded inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B33/00—Hand tools not covered by any other group in this subclass

Definitions

  • the present invention relates to a tang break-off tool which permits breaking off a tang after inserting a spiral coil insert with a tang into a taphole of a work, and the further removal of the tang as broken off.
  • a tanged spiral coil insert When a weak female screw makes it impossible to obtain a high tightening force while directly tapping into a work comprising a light metal such as aluminum, plastics, wood or cast iron, it is the conventional practice to use a tanged spiral coil insert for the purpose of ensuring a high reliable screw tightening.
  • Fig. 5 illustrates an example of the tanged spiral coil insert.
  • a spiral coil insert with a tang 10 is usually manufactured by winding a high strength special steel wire having a rhombic cross-section into .a spring-shaped cylinder. It is screwed into a taphole 101 formed in a work 100 by means of an inserting tool, as shown in fig. 6, and fixed therein. Thereafter, a bolt 20 or the like is screw-engaged with this spiral coil insert 10 as a female screw.
  • a stopper piece 11, folded in the radial direction of the coil, known as a tang engaged to the insertion tool is provided at the coil free end as shown in fig. 5.
  • this tang must be removed.
  • a notch 12 is formed on the outer side. surface of the coil at a first coil portion to be connected to the coil free end on which the tang 11 is formed.
  • the tang 11 is broken off after attachment to the work 100, and the broken tang 11 must be collected. Particularly when the taphole 101 of the work 100 takes the form of a blind hole, this operation is very difficult. If collection of the separated tang 11 fails, the tang 11 may cause electrical or mechanical failure. It is therefore necessary to remove the separated tang without fail.
  • the present invention is based on such novel findings obtained by the inventor.
  • the present invention has therefore an object to provide a tang break-off tool which, after attaching a spiral coil insert with a tang to a taphole of a work, makes it possible to break off the tang, and further, to facilitate the easy and certain removal of the broken tang.
  • the invention relates to a tang break-off tool having a grip section, an operating section and a permanent magnet provided on the leading end of the operating section.
  • the above-mentioned permanent magnet is secured in a recess formed on the leading end of the operating section.
  • the permanent magnet should preferably not project from the leading end of the operating section.
  • Fig.1 illustrates an embodiment of the tang break-off tool of the invention.
  • the tang break-off tool 1 has a grip section 2 and an operating section 3.
  • the grip section 2 has a size which permits easy grip by an operator: in this embodiment, the grip section 2 has a diameter (D) of 10 mm and a length of 8 cm, but is not limited.
  • the geometry of the operating section 3, varying with the size of the tanged spiral coil insert 10 used, comprises a diameter of 4 mm and a length of 3.5 cm in this embodiment, so that it serves as a tool for a tanged spiral coil insert 10 having an inside diameter of 5 mm and a length of about 1 cm.
  • the grip section 2 and the operating section 3 are prepared as one body from a steel material such as S45C, but it may be made of any arbitrary material.
  • a permanent magnet 4 is arranged on the leading end of the operating section 3.
  • a recess 5 is formed at the leading end of the operating section 3, and the permanent magnet 4 is secured in the recess 5 with an adhesive or the like.
  • the permanent magnet 4 does not project from the leading end of the operating section 3: in the present embodiment, it is located at a position about 0.5 mm in depth (h2). In this configuration, upon breaking off a tang 11 with the tool, it is possible to prevent the permanent magnet 4 from coming into contact with the tang 11 and causing a damage thereto.
  • the strength of the magnet 4 is such that the tang snapped off from the tanged spiral coil insert 10 can be attracted.
  • a magnet having a diameter (d1) of 3 mm and a height (h1) of 4 mm and having different magnet poles on both surfaces as shown in Fig. 2 is used, but the geometry of the magnet 4 is not limited to this.
  • the tool 1 of the invention is inserted into the tanged spiral coil insert 10, and brings the leading end of the operating section 3 into contact with the tang 11 of the tanged spiral coil insert 10. Then, the tang 11 is broken off at a notch 12 (Fig. 5) by hitting the top end of the grp section 2 with a tool such as a hammer.
  • the tang 11 broken off as described above is illustrated in Fig. 3(B).
  • the tanged spiral coil insert 10 is prepared from a material having properties of a magnetic material as a result of cold working, such as a 18-8 stainless steel wire, or an arbitrary material believed to be magnetic material.
  • the snapped tang 11 is attracted by the magnet 4 of he operating section 3 at the leading end of the tool, as shown in Fig. 3(C); by causing the tool 1 to descend. In this state, the tang 11 can be taken out as shown in Fig. 4 by pulling up the tool 1.
  • the tang break-off tool of the present invention has a grip section and an operating section and has a permanent magnet provided at the leading end of the operating section. It is therefore possible to break off the tang after inserting the tanged spiral coil insert into the taphole of the work, and further, to easily and with certainty remove the tang as broken off.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Food-Manufacturing Devices (AREA)
  • Scissors And Nippers (AREA)

Abstract

The present invention provides a tang break-off tool which makes it possible to break off the tang after inserting the spiral coil insert with the tang into the taphole of the work, and further, to easily and with certainty remove the broken tang. The tool has a grip section (2) and an operating section (3), and has a permanent magnet (4) provided at the leading end of the operating section (3).

Description

    BACKGROUND OF THE INVENTION Field of the Invention
  • The present invention relates to a tang break-off tool which permits breaking off a tang after inserting a spiral coil insert with a tang into a taphole of a work, and the further removal of the tang as broken off.
    • Description of the Related Art
  • When a weak female screw makes it impossible to obtain a high tightening force while directly tapping into a work comprising a light metal such as aluminum, plastics, wood or cast iron, it is the conventional practice to use a tanged spiral coil insert for the purpose of ensuring a high reliable screw tightening. Fig. 5 illustrates an example of the tanged spiral coil insert.
  • As shown in Fig. 5, a spiral coil insert with a tang 10 is usually manufactured by winding a high strength special steel wire having a rhombic cross-section into .a spring-shaped cylinder. It is screwed into a taphole 101 formed in a work 100 by means of an inserting tool, as shown in fig. 6, and fixed therein. Thereafter, a bolt 20 or the like is screw-engaged with this spiral coil insert 10 as a female screw. By using the spiral coil insert 10 as described above, it is possible to obtain a high screw tightening force, to repeatedly insert the bolt 20, and to remove the same.
  • Because the tanged spiral coil insert 10 is screwed into the taphole 101 by the use of the insertion tool as described above, a stopper piece 11, folded in the radial direction of the coil, known as a tang engaged to the insertion tool is provided at the coil free end as shown in fig. 5. After the coil insert 10 is secured in the taphole 101 of the work 100, this tang must be removed. For this purpose, a notch 12 is formed on the outer side. surface of the coil at a first coil portion to be connected to the coil free end on which the tang 11 is formed.
  • From the tanged spiral coil insert 10 as described above, the tang 11 is broken off after attachment to the work 100, and the broken tang 11 must be collected. Particularly when the taphole 101 of the work 100 takes the form of a blind hole, this operation is very difficult. If collection of the separated tang 11 fails, the tang 11 may cause electrical or mechanical failure. It is therefore necessary to remove the separated tang without fail.
  • When the taphole 101 of the work 100 is formed into a blind hole, it is the present practice to remove the separated tang 11 by, for example, tilting the work 100. This practice is not effective however when the work is large in size. When the tanged spiral coil insert 10 is large in size, the separated tang can be removed by the use of a pincette or the like. However, in the case of a small-diameter tanged spiral coil insert 10, this practice is sometimes not applicable. There is therefore a demand for a method of certain and easy removal of the separated tang.
  • As a result of extensive studies and experiments carried out to solve the above-mentioned problems, the present inventor obtained the following findings. Even when a tanged spiral coil insert 10 is prepared through many cold working steps by the use of 18-8 stainless steel (SUS304) wire usually considered to be a non-magnetic material, the prepared tanged spiral coil insert 10 exhibits properties of magnetic material. The inventor found, in view of this fact, the possibility of being able to remove a snapped tang by attracting it with a magnet.
  • The present invention is based on such novel findings obtained by the inventor.
    • SUMMARY OF THE INVENTION
  • The present invention has therefore an object to provide a tang break-off tool which, after attaching a spiral coil insert with a tang to a taphole of a work, makes it possible to break off the tang, and further, to facilitate the easy and certain removal of the broken tang.
  • The aforementioned object is achieved by the use of the tang break-off tool of the invention. In summary, the invention relates to a tang break-off tool having a grip section, an operating section and a permanent magnet provided on the leading end of the operating section.
  • According to an embodiment of the invention, the above-mentioned permanent magnet is secured in a recess formed on the leading end of the operating section. The permanent magnet should preferably not project from the leading end of the operating section.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • Fig. 1 is a perspective view illustrating an embodiment of the tang break-off tool of the present invention;
  • Fig. 2 is an enlarged sectional view illustrating the configuration of the leading end of the tang break-off tool of the invention;
  • Fig. 3 illustrates the manner of use of the tang break-off tool of the invention;
  • Fig. 4 illustrates the manner of use of the tang break-off tool of the invention;
  • Fig. 5 is a perspective view of a tang spiral coil insert; and
  • Fig. 6 illustrates the tang spiral coil insert being attached to a work.
    • DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • The tang break-off tool of the present invention will now be described in further detail with reference to the drawings.
  • Fig.1 illustrates an embodiment of the tang break-off tool of the invention. According to this embodiment, the tang break-off tool 1 has a grip section 2 and an operating section 3. The grip section 2 has a size which permits easy grip by an operator: in this embodiment, the grip section 2 has a diameter (D) of 10 mm and a length of 8 cm, but is not limited. The geometry of the operating section 3, varying with the size of the tanged spiral coil insert 10 used, comprises a diameter of 4 mm and a length of 3.5 cm in this embodiment, so that it serves as a tool for a tanged spiral coil insert 10 having an inside diameter of 5 mm and a length of about 1 cm. In this embodiment, the grip section 2 and the operating section 3 are prepared as one body from a steel material such as S45C, but it may be made of any arbitrary material.
  • According to the invention, as shown in Fig. 2, a permanent magnet 4 is arranged on the leading end of the operating section 3. In this embodiment, a recess 5 is formed at the leading end of the operating section 3, and the permanent magnet 4 is secured in the recess 5 with an adhesive or the like. It is preferable that the permanent magnet 4 does not project from the leading end of the operating section 3: in the present embodiment, it is located at a position about 0.5 mm in depth (h2). In this configuration, upon breaking off a tang 11 with the tool, it is possible to prevent the permanent magnet 4 from coming into contact with the tang 11 and causing a damage thereto.
  • The strength of the magnet 4 is such that the tang snapped off from the tanged spiral coil insert 10 can be attracted. In this embodiment, a magnet having a diameter (d1) of 3 mm and a height (h1) of 4 mm and having different magnet poles on both surfaces as shown in Fig. 2 is used, but the geometry of the magnet 4 is not limited to this.
  • A manner of use of the tool 1 having the above-mentioned configuration of the invention will now be described with reference to Fig. 3.
  • As shown in Fig. 3(A), when the tanged spiral coil insert 10 is attached to the work 100, the tool 1 of the invention is inserted into the tanged spiral coil insert 10, and brings the leading end of the operating section 3 into contact with the tang 11 of the tanged spiral coil insert 10. Then, the tang 11 is broken off at a notch 12 (Fig. 5) by hitting the top end of the grp section 2 with a tool such as a hammer. The tang 11 broken off as described above is illustrated in Fig. 3(B). It is needless to mention that the tanged spiral coil insert 10 is prepared from a material having properties of a magnetic material as a result of cold working, such as a 18-8 stainless steel wire, or an arbitrary material believed to be magnetic material.
  • After breaking off the tang 11, the snapped tang 11 is attracted by the magnet 4 of he operating section 3 at the leading end of the tool, as shown in Fig. 3(C); by causing the tool 1 to descend. In this state, the tang 11 can be taken out as shown in Fig. 4 by pulling up the tool 1.
  • As described above, the tang break-off tool of the present invention has a grip section and an operating section and has a permanent magnet provided at the leading end of the operating section. It is therefore possible to break off the tang after inserting the tanged spiral coil insert into the taphole of the work, and further, to easily and with certainty remove the tang as broken off.

Claims (3)

  1. A tang break-off tool having a grip section and a working section, wherein a permanent magnet is provided at the leading end of said working section.
  2. A tang break-off tool according to claim 1, wherein said permanent magnet is secured in a recess formed at the leading end of said working section.
  3. A tang break-off tool according to claim 1 or 2, wherein said permanent magnet does not project from the leading end of said working section.
EP00300112A 1999-08-20 2000-01-10 Tang break-off tool Withdrawn EP1078719A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP23481699 1999-08-20
JP23481699 1999-08-20

Publications (1)

Publication Number Publication Date
EP1078719A2 true EP1078719A2 (en) 2001-02-28

Family

ID=16976843

Family Applications (2)

Application Number Title Priority Date Filing Date
EP00300112A Withdrawn EP1078719A2 (en) 1999-08-20 2000-01-10 Tang break-off tool
EP00951963A Withdrawn EP1132174A4 (en) 1999-08-20 2000-08-11 Tongue bend-breaking and removing tool, and tongue bend-breaking and removing tool used also as tongued spiral coil insert inserting tool

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP00951963A Withdrawn EP1132174A4 (en) 1999-08-20 2000-08-11 Tongue bend-breaking and removing tool, and tongue bend-breaking and removing tool used also as tongued spiral coil insert inserting tool

Country Status (7)

Country Link
EP (2) EP1078719A2 (en)
KR (2) KR20010020616A (en)
CN (1) CN1114520C (en)
AU (2) AU1014700A (en)
CA (1) CA2295258C (en)
TW (1) TW419415B (en)
WO (1) WO2001014105A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10305898A1 (en) * 2003-02-13 2004-08-26 Alstom Technology Ltd Process for installing spiral thread inserts and installation tool for carrying out the process

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4563967B2 (en) * 2006-06-06 2010-10-20 本田技研工業株式会社 Helisert tool and Helisert correction tool
DE102011051846B4 (en) 2011-07-14 2013-01-24 Böllhoff Verbindungstechnik GmbH Tool for installing or removing a tangless wire thread insert, method of manufacture therefor and method of manually changing a picking blade of this tool
AT517436B1 (en) * 2015-06-15 2017-04-15 Fill Gmbh Device and method for automated mounting of threaded inserts in components
CN105290271B (en) * 2015-11-12 2017-05-17 西安航空动力股份有限公司 Device and method for cutting off and collecting steel wire thread sleeve tail shank of casing with complex blind cavity
CN106078182B (en) * 2016-06-24 2018-04-27 西安博瓦工业自动化设备有限公司 A kind of steel-wire screw-socket installs equipment
CN106915258B (en) * 2017-01-18 2020-10-23 上海蔚来汽车有限公司 Support bracket, picking workpiece and vehicle instrument panel
CN107649636A (en) * 2017-10-25 2018-02-02 苏州卓尹特机电科技有限公司 A kind of hand electric self-pierce riveting picks
DE102017223678A1 (en) * 2017-12-22 2019-06-27 Continental Teves Ag & Co. Ohg Aggregate with at least one piston with an associated piston spring
US11059152B2 (en) 2018-10-19 2021-07-13 Pratt & Whitney Canada Corp. Tool and method for removing helical insert tang
JP6879581B2 (en) * 2019-06-04 2021-06-02 株式会社三友精機 Tongue cutting tool and tongue breaking method
JP7209393B1 (en) * 2021-12-15 2023-01-20 株式会社三友精機 Tongue breaking tool and tongue breaking method

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
US2594901A (en) * 1950-07-25 1952-04-29 Heli Coil Corp Axial impact type tang break-off tool
US3327516A (en) * 1964-07-22 1967-06-27 Carroll W Hoshour Percussion tool holder
GB1192336A (en) * 1968-08-05 1970-05-20 Rolls Royce Method of removing a Tang which extends from an insert which has been screwed into a Threaded Hole
FR2169293A1 (en) * 1972-01-27 1973-09-07 Rolls Royce
US5169193A (en) * 1991-12-09 1992-12-08 Stelmach John J Magnetic pickup tool
US5172842A (en) * 1991-12-13 1992-12-22 Emhart, Inc. Tool for breaking and removing tang of an inserted wire coil insert
KR0138617Y1 (en) * 1996-04-18 1999-05-01 김광호 Tang removal tool
KR0181606B1 (en) * 1996-06-29 1999-05-15 양재신 Helical coil insertion apparatus
JP2982770B2 (en) * 1997-11-21 1999-11-29 日本電気株式会社 Tongue breaker
JP2000061860A (en) * 1998-08-18 2000-02-29 Nippon Denki Musen Denshi Kk Helical insert inserting jig
US6312138B1 (en) * 1999-10-15 2001-11-06 Edward S. Coleman, Jr. Lighted magnetic retrieval tool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10305898A1 (en) * 2003-02-13 2004-08-26 Alstom Technology Ltd Process for installing spiral thread inserts and installation tool for carrying out the process
US7340814B2 (en) 2003-02-13 2008-03-11 Alstom Technology Ltd. Method of installing spiral threaded inserts and installation tool

Also Published As

Publication number Publication date
KR20010085936A (en) 2001-09-07
WO2001014105A1 (en) 2001-03-01
KR100573822B1 (en) 2006-04-26
AU6475700A (en) 2001-03-19
EP1132174A4 (en) 2007-04-04
AU775115B2 (en) 2004-07-15
CA2295258C (en) 2009-09-08
TW419415B (en) 2001-01-21
EP1132174A1 (en) 2001-09-12
CN1114520C (en) 2003-07-16
CN1285262A (en) 2001-02-28
KR20010020616A (en) 2001-03-15
CA2295258A1 (en) 2001-02-20
AU1014700A (en) 2001-02-22

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