EP1060812A2 - Wire for helical coil insert - Google Patents
Wire for helical coil insert Download PDFInfo
- Publication number
- EP1060812A2 EP1060812A2 EP00300113A EP00300113A EP1060812A2 EP 1060812 A2 EP1060812 A2 EP 1060812A2 EP 00300113 A EP00300113 A EP 00300113A EP 00300113 A EP00300113 A EP 00300113A EP 1060812 A2 EP1060812 A2 EP 1060812A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire
- coil
- helical coil
- insert
- helical
- 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.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F3/00—Coiling wire into particular forms
- B21F3/12—Coiling wire into particular forms of interconnected helical springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F3/00—Coiling wire into particular forms
- B21F3/02—Coiling wire into particular forms helically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/56—Making machine elements screw-threaded elements
Abstract
Description
- The present invention relates to a helical coil insert used generally by inserting the same into a tap hole of a work. More particularly, the invention relates to a wire used when manufacturing such a helical coil insert.
- When, with a directly tapped work made of a light metal such as aluminum, plastics, wood or cast iron, there is unavailable a high tightening force because of a weak female screw, it is the conventional practice to use a helical coil insert so as to ensure highly reliable screw tightening.
- More specifically, a tanged
helical coil insert 10T is illustrated in Fig. 4. Such ahelical coil insert 10T is prepared usually by winding into a spring-shaped cylinder a high tensile special steel wire having a diamond-shaped cross-section such as a cold-rolled 18-8 stainless steel wire, and is screwed into atap hole 101 formed in awork 100 by means of an insertion tool and secured thereto as shown in Figs. 5 and 6. Then, abolt 20 or the like is screw-engaged with this helical coil insert 10T as a female screw. By using the helical coil insert 10T as described above, a high screw tightening force is available, and further, it is possible to repeatedly insert and disengage thebolt 20. - Because the tanged
helical coil insert 10T is driven into thetap hole 101 by the insertion tool, astopper piece 11 folded down in the radial direction of the coil, known as a tang engaged with the insertion tool is provided. Thistang 11 must be removed after it is secured into thetap hole 101 of thework 100, and for this purpose, anotch 8 is formed on the outer side surface of a first coil portion in contact with the coil free end having thetang 11 formed thereon. - From the tanged
helical coil insert 10T, it is necessary to collect thetang 11 removed as described above, after attachment of the insert onto thework 100. The collecting operation is however very complicated. Further, if the removedtang 11 is not collected, thetang 11 may cause an electrical or mechanical trouble. A tangless helical coil insert 10 as shown in Fig. 7 may sometimes be used for this reason. - The tangless
helical coil insert 10 is as well attached to thetap hole 101 of the work as shown in Figs. 5 and 6. In the case of the tangless helical coil insert 10, unlike the tanged helical coil insert 10T, the operation of collecting the removedtang 11 after attachment is not necessary. As shown in Figs. 7 and 8, however, it is necessary to formrecesses heads click 31 of theinsertion tool 30. In addition, theheads - The helical coil insert 10 having the
heads recesses - (1) press-working the tip of a long wire to form, for example, a
convergent head 4 having a desired shape (forming step); - (2) forming a
recess 6 for an insertion tool by press working in proximity to thehead 4 of the desired shape (notching step); - (3) preparing a helical coil having the aforementioned head as the leading end while feeding the wire, and cutting the wire upon the formation of the helical coil by a prescribed number of turns; and
- (4) forming the end of the thus cut coil into a
head 5 and arecess 7 of desired shapes through the same working operation as in the above-mentioned steps (1) and (2). -
- It is conventional practice to manufacture one
coil insert 10 by the steps described above, and therefore, this practice has a productivity problem. - It is therefore an object of the present invention to provide a wire for a helical coil insert capable of being used when manufacturing a helical coil insert, and permitting the efficient and continuous manufacture of helical coil inserts, and the remarkable improvement of productivity of helical coil inserts.
- The aforementioned object of the present invention is achieved with the wire for a helical coil insert of the invention. In summary, according to an aspect of the invention, there is provided a wire for manufacturing a helical coil insert, comprising coil free end forming sections formed at prescribed intervals of length in the axial direction of a wire, the coil free end forming sections having a first and a second convergent sections extending in directions leaving each other along the axial direction of the wire to reach an outer periphery of the wire and a first and a second recesses formed respectively adjacently to the first and second convergent sections. According to an embodiment of the invention, the coil free end forming sections are formed in alignment with the axial direction of the wire. According to another embodiment of the invention, the coil free end forming sections have a coupling section, extending for a prescribed distance in the axial direction, for connecting the first and second convergent sections. The first and second convergent sections and the first and second recesses of the wire of the invention form a head of the coil free end tip and the recess of the helical coil insert.
- According to another aspect of the invention, there is provided a wire for manufacturing a helical coil insert with a tang, comprising coil free end forming sections formed at prescribed intervals of length in the axial direction of a wire, the coil free end forming sections having a notch comprising a first and a second slants extending in a direction leaving each other along the axial direction of the wire to reach the outer periphery of the wire. According to an embodiment of the invention, the coil free end forming sections are in alignment with the axial direction of the wire. The aforesaid notch of the wire of the invention forms a notch on an inner periphery of a first coil portion adjacent to the tanged helical coil insert.
-
- Fig. 1(a) illustrates an embodiment of the wire for a helical coil insert of the present invention; and Fig. 1(b) is an enlarged view illustrating the coil free end forming section;
- Fig. 2(a) is a descriptive view illustrating a method for manufacturing a helical coil insert with, the use of the wire for a helical coil insert of the invention; Fig. 2(b) illustrates a separated helical coil insert; and Fig. 2(c) illustrates a series of helical coil inserts manufactured with the use of the wire for a helical coil insert of the invention;
- Fig. 3(a) illustrates another embodiment of the wire for a helical coil insert of the invention; Fig. 3(b) is a descriptive view of a method for manufacturing a tanged helical coil insert with the use of the wire for a helical coil insert of the invention; and Fig. 3(c) illustrates a separated tanged helical coil insert;
- Fig. 4 is a perspective view of the tanged helical coil insert;
- Fig. 5 is a descriptive view illustrating a method for using a helical coil insert;
- Fig. 6 is a descriptive view illustrating a helical coil insert as attached to a work;
- Fig. 7 is a perspective view illustrating a tangless helical coil insert; and
- Fig. 8 is a descriptive view illustrating the relationship between the tangless helical coil insert and an attachment tool.
-
- The wire for a helical coil insert of the present invention will now be described further in detail with reference to the drawings.
- Fig. 1 illustrates an embodiment of the wire 1 for a helical coil insert of the present invention. According to this embodiment, a wire 1 may be, for example, a high tensile special steel wire such as a cold-worked 18-8 stainless steel wire having, for example, a diamond-shaped cross-section.
- According to the invention, as shown in Fig. 1(a), coil free
end forming sections 2 axe formed, on the wire 1, at prescribed intervals of length (P) determined from the geometry of a helical coil insert to be manufactured, in the longitudinal axial direction of the wire 1. The coil freeend forming sections 2 have acoupling section 3 having a prescribed length (W) with a cross-sectional shape smaller than the outer shape of the wire, and a first and a secondconvergent sections coupling section 3 and which extend in directions leaving each other toward the outer periphery of the wire 1 along the axial direction thereof. The length (W) of thiscoupling section 3 may be set at an arbitrary value as required, or may be non-existent. - The aforementioned first and second
convergent sections sections convergent sections convergent sections - Further, the coil free
end forming section 2 hasrecesses convergent sections recesses flat surfaces clicks 31 of the insertion tool 30 (Fig. 8) after completion of the helical coil insert, andcurved surfaces flat surfaces convergent sections recesses - The coil free
end forming section 2 having the configuration as described above can be formed by the same press working as that applied when forming theheads recesses end forming section 2 is formed usually in alignment with the axial line of the wire 1. - When manufacturing a helical coil insert 10 with the use of the wire 1 of the invention, the wire 1 is continuously fed to a coil manufacturing machine so that the aforementioned coil free
end forming section 2 is positioned on the inner periphery side during coiling. The coil manufacturing machine may be one commonly in use. As shown in Fig. 2(a), the wire 1 fed to the coil manufacturing machine is clamped at the tip thereof by a clamping means of the coil manufacturing machine, or as required, coiled into a coil without clamping. - Upon completion of coiling a coil with a prescribed number of turns, the wire is cut for separation from the
coupling section 3, and thus, as shown in Fig. 2(b), thehelical coil insert 10 already provided with theheads recesses helical coil insert 10, the next wire 1 is fed in succession to the coil manufacturing machine to carry out the next operation of coiling for the manufacture of the nexthelical coil insert 10. - By using the wire 1 of the present invention, as described above, the wire 1 fed to the coil manufacturing machine already has heads and recesses formed thereon. It is therefore only required to apply coil head working to a minimum extent as required to the wire fed to the coil manufacturing machine, thus permitting remarkable improvement of productivity as compared with the conventional manufacturing method.
- According to another method, a plurality of helical coil inserts 10 are continuously manufactured as shown in Fig. 2(c) by feeding the wire 1 continuously to the coil manufacturing machine. Then, the helical coil inserts 10 are individually separated, as shown in Fig. 2(b), by cutting and separating this continuous
helical coil insert 10 into individual helical coil inserts at the position of thecoupling section 3 of the coil free end forming sections. Subsequently, as required, finish working may be applied to make theheads helical coil insert 10 smoother. - According to this manufacturing method, helical coil inserts are manufactured continuously, and then, it is sufficient to separate the helical coil insert into individual pieces, leading to a remarkably improved productivity. Further, since the
head 4 of onehelical coil insert 10 is connected to thehead 5 of the next helical coil insert via thecoupling section 3, it is possible to smoothly form a coil without the risk of breaking the free end forming section of the helical coil insert, and this provides the advantage of further improved productivity. - While the wire 1 has a diamond-shaped cross-section in the aforementioned embodiment, the cross-sectional shape of the wire 1 of the invention is not limited to this, but the wire of the invention may take any arbitrary shape such as a rectangle, a circle or a triangle.
- Fig. 3 illustrates another embodiment of the wire rod 1 according to the present invention. In this embodiment, the coil free
end forming section 2 may be anotch 8 comprising a first and asecond slants Embodiment 2, coil freeend forming sections 2 are usually arranged in alignment with the axial line of the wire 1 at prescribed intervals in the axial direction of the wire 1. - Use of the wire 1 of the invention suitably permits manufacture of a tanged
helical coil insert 10T provided with anotch 8 as shown in Fig. 3(c) on the coil innerperiphery. - More specifically, when manufacturing a tanged
helical coil insert 10T, the wire 1 is continuously fed to a coil manufacturing machine so that the aforementioned coil freeend forming section 2, i.e., thenotch 8 is positioned on the inner periphery side during the coiling operation. The coil manufacturing machine may be one commonly in use. The wire 1 fed to the coil manufacturing machine is clamped at the tip thereof by a clamping means of the coil manufacturing machine as shown in Fig.3(b) to form a tang, and thereafter, the wire 1 is coiled. - Upon completion of a coiling into a coil having a prescribed number of turns, the wire 1 is cut for separation at a position a prescribed distance prior to the
next notch 8 position, thereby manufacturing a tangedhelical coil insert 10T having a notch already formed at a first coil portion in the proximity to atang 11, as shown in Fig. 3(c). After manufacture of one tangedhelical coil insert 10T, the wire 1 is continuously fed to the coil manufacturing machine for the next operations of tang forming and coiling for the manufacture of the next tangedhelical coil insert 10T. - In the tanged
helical coil insert 10T manufactured by the use of the wire 1 of the invention, unlike the conventional tangedhelical coil insert 10T shown in Fig. 4, thenotch 8 is formed on the inner periphery of the coil. When a notch is thus formed on the coil inner periphery, there is provided the advantage of easier removal of thetang 11 after fixing thehelical coil insert 10T into atap hole 101 of thework 100. Manufacture of a tangedhelical coil insert 10T of such a conventionally required shape, after manufacture of the tangedhelical coil insert 10T, the manual forming of anotch 8 on the coil inner periphery can be accomplished later. This leads to very low productivity and high cost for the insert. - By the use of the wire 1 of the present invention, it is possible to manufacture a tanged
helical coil insert 10T as shown in Fig. 3(c) with a high productivity, and hence at a low cost. - In this embodiment also, it is not necessary that the wire 1 has a diamond-shaped cross-section, but the cross-section may have any arbitrary shape such as a rectangle, a circle or a triangle.
- As described above, the present invention provides a wire for the manufacture of a helical coil insert having a configuration comprising coil free end forming sections formed at prescribed intervals of length in the axial direction of a wire, the coil free end forming sections having a first and a second convergent sections extending in directions leaving each other along the axial direction of the wire to reach the outer periphery of the wire rod and a first and a second recesses formed respectively adjacently to the first and second convergent sections, or coil free end forming sections having a notch comprising a first and a second slants extending in directions leaving each other along the axial direction of the wire to reach the exterior shape of the wire. It is therefore possible, by the use thereof in the manufacture of a helical coil inert, to continuously manufacture a helical coil insert at a very high efficiency, thus permitting the remarkable improvement of productivity of helical coil inserts.
Claims (10)
- A wire for manufacturing a helical coil insert, comprising coil free end forming sections formed at prescribed intervals of length in the axial direction of a wire, said coil free end forming sections having a first and a second convergent sections extending in directions leaving each other along the axial direction of the wire to reach the outer periphery of the wire and a first and a second recesses formed respectively adjacently to said first and second convergent sections.
- A wire for a helical coil insert according to claim 1, wherein said coil free end forming sections are formed in alignment with the axial direction of the wire.
- A wire for a helical coil insert according to claim 1 or 2, wherein said coil free end forming sections have a coupling section, extending for a prescribed distance in the axial direction, for connecting said first and second convergent sections.
- A wire for a helical coil insert according to any one of claims 1, 2 and 3, wherein said first and second convergent sections and said first and second recesses serve to form a head and a recess of a coil free end tip of a helical coil insert.
- A wire for manufacturing a helical coil insert with a tang, comprising coil free end forming sections formed at prescribed intervals of length in the axial direction of a wire, said coil free end forming sections having a notch comprising a first and a second slants extending in a direction leaving each other along the axial direction of the wire to reach the outer periphery of the wire.
- A wire for a helical insert with a tang according to claim 5, wherein said coil free end forming sections are formed in alignment with the axial direction of the wire.
- A wire for a helical insert with a tang according to claim 5 or 6, wherein said notch forms a notch on an inner periphery of a first coil portion adjacently to said tanged helical coil insert.
- A wire for manufacturing a helical coil insert, comprising coil free end forming sections formed at prescribed intervals of length in the axial direction of a wire.
- A method of manufacturing a helical coil insert, comprising taking a wire as claimed in any preceding claim, forming a plurality of helical coils and separating the plurality of helical coils into individual helical coils.
- A method of manufacturing a helical coil insert, comprising taking a wire as claimed in any preceding claim, forming a helical coil and separating the helical coil from the remainder of the wire.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17027599 | 1999-06-16 | ||
JP17027599A JP4018844B2 (en) | 1999-06-16 | 1999-06-16 | Method for manufacturing helical coil insert |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1060812A2 true EP1060812A2 (en) | 2000-12-20 |
EP1060812A3 EP1060812A3 (en) | 2001-11-28 |
EP1060812B1 EP1060812B1 (en) | 2003-09-17 |
Family
ID=15901936
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20000300113 Expired - Lifetime EP1060812B1 (en) | 1999-06-16 | 2000-01-10 | Wire for helical coil insert |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1060812B1 (en) |
JP (1) | JP4018844B2 (en) |
CA (1) | CA2295256C (en) |
DE (1) | DE60005249T2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002076651A1 (en) * | 2001-03-23 | 2002-10-03 | Newfrey Llc | Cold head stamped fastener inserts including selectively removable tangs |
US9719546B2 (en) | 2010-11-08 | 2017-08-01 | Böllhoff Verbindungstechnik GmbH | Wire thread insert with redressable mounting tang as well as its manufacturing and installation |
FR3102708A1 (en) * | 2019-11-04 | 2021-05-07 | Skf Aerospace France | Interface for fixing a first part on a second part comprising a flange made of composite materials, complete bearing comprising such an interface and method of manufacturing such an interface |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2022087907A (en) | 2020-12-02 | 2022-06-14 | 株式会社ジャノメ | Insert supply device |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1862992A (en) * | 1929-06-14 | 1932-06-14 | Gen Motors Corp | Coil spring |
GB682135A (en) * | 1950-02-27 | 1952-11-05 | B E V I Bulloneria E Viteria I | Improvements in or relating to the drawing of wire or rod |
GB1015300A (en) * | 1964-10-14 | 1965-12-31 | Heli Coil Corp | Wire coil screw thread insert |
JPS58112621A (en) * | 1981-12-25 | 1983-07-05 | High Frequency Heattreat Co Ltd | Cutting knife for cold formed coil spring |
US4563119A (en) * | 1984-02-21 | 1986-01-07 | Rexnord Inc. | Hook cutout for tangless helically coiled insert |
US4645398A (en) * | 1983-09-16 | 1987-02-24 | Rexnord Inc. | Tangless helically coiled insert |
DE4129172A1 (en) * | 1991-09-03 | 1993-03-11 | Saar Federn Gmbh | Winding method for heat-treated wire with varying dia. - has central cylindrical wire section pre-curved before coiling, and end sections are coiled elastically |
-
1999
- 1999-06-16 JP JP17027599A patent/JP4018844B2/en not_active Expired - Lifetime
-
2000
- 2000-01-10 EP EP20000300113 patent/EP1060812B1/en not_active Expired - Lifetime
- 2000-01-10 DE DE2000605249 patent/DE60005249T2/en not_active Expired - Lifetime
- 2000-01-11 CA CA 2295256 patent/CA2295256C/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1862992A (en) * | 1929-06-14 | 1932-06-14 | Gen Motors Corp | Coil spring |
GB682135A (en) * | 1950-02-27 | 1952-11-05 | B E V I Bulloneria E Viteria I | Improvements in or relating to the drawing of wire or rod |
GB1015300A (en) * | 1964-10-14 | 1965-12-31 | Heli Coil Corp | Wire coil screw thread insert |
JPS58112621A (en) * | 1981-12-25 | 1983-07-05 | High Frequency Heattreat Co Ltd | Cutting knife for cold formed coil spring |
US4645398A (en) * | 1983-09-16 | 1987-02-24 | Rexnord Inc. | Tangless helically coiled insert |
US4563119A (en) * | 1984-02-21 | 1986-01-07 | Rexnord Inc. | Hook cutout for tangless helically coiled insert |
DE4129172A1 (en) * | 1991-09-03 | 1993-03-11 | Saar Federn Gmbh | Winding method for heat-treated wire with varying dia. - has central cylindrical wire section pre-curved before coiling, and end sections are coiled elastically |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 007, no. 217 (M-245), 27 September 1983 (1983-09-27) & JP 58 112621 A (KOUSHIYUUHA NETSUREN KK), 5 July 1983 (1983-07-05) * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002076651A1 (en) * | 2001-03-23 | 2002-10-03 | Newfrey Llc | Cold head stamped fastener inserts including selectively removable tangs |
US6561913B2 (en) * | 2001-03-23 | 2003-05-13 | Newfrey Llc | Cold head stamped fastener inserts including selectively removable tangs |
US9719546B2 (en) | 2010-11-08 | 2017-08-01 | Böllhoff Verbindungstechnik GmbH | Wire thread insert with redressable mounting tang as well as its manufacturing and installation |
FR3102708A1 (en) * | 2019-11-04 | 2021-05-07 | Skf Aerospace France | Interface for fixing a first part on a second part comprising a flange made of composite materials, complete bearing comprising such an interface and method of manufacturing such an interface |
US11415176B2 (en) | 2019-11-04 | 2022-08-16 | SKF Aerospace France S.A.S | Interface for fastening a first component to a second component comprising a collar made from composite material, bearing unit comprising such an interface and method for manufacturing such an interface |
Also Published As
Publication number | Publication date |
---|---|
EP1060812B1 (en) | 2003-09-17 |
EP1060812A3 (en) | 2001-11-28 |
CA2295256A1 (en) | 2000-12-16 |
JP2000356212A (en) | 2000-12-26 |
CA2295256C (en) | 2007-08-21 |
JP4018844B2 (en) | 2007-12-05 |
DE60005249D1 (en) | 2003-10-23 |
DE60005249T2 (en) | 2004-07-15 |
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