EP0043437B1 - Retainer member with dual action cantilever beams - Google Patents
Retainer member with dual action cantilever beams Download PDFInfo
- Publication number
- EP0043437B1 EP0043437B1 EP19810104120 EP81104120A EP0043437B1 EP 0043437 B1 EP0043437 B1 EP 0043437B1 EP 19810104120 EP19810104120 EP 19810104120 EP 81104120 A EP81104120 A EP 81104120A EP 0043437 B1 EP0043437 B1 EP 0043437B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conductor
- portions
- lower portions
- retainer
- insulation
- 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.)
- Expired
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
- H01R4/2416—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type
- H01R4/242—Connections using contact members penetrating or cutting insulation or cable strands the contact members having insulation-cutting edges, e.g. of tuning fork type the contact members being plates having a single slot
- H01R4/2425—Flat plates, e.g. multi-layered flat plates
Definitions
- This invention relates to retaining members having dual action cantilever beams, that is with two spaced beams between which a further member is pushed to be retained therein.
- the invention is applicable to contacts for electrical conductors, and more particularly to insulation displacing contacts for insulated conductors.
- Conductor contacts and particularly insulation displacing contacts are well known, comprising generally, two spaced legs or beams, between which the conductor is pushed.
- the insulation may be removed or displaced by crushing, cutting or slicing. In crushing the insulation is squeezed between conductor and terminal and pushed off the conductor.
- U.S. patent 3,112,147 A typical example of such a terminal is described in U.S. patent 3,112,147.
- cutting the insulated conductor is pushed down between two cutting edges which extend in a direction normal to the axis of the conductor. In such terminals the cutting edges cut through the insulation, which may then be deformed sideways.
- U.S. patent 3,027,536 describes one form of such a terminal.
- slicing as described in U.S. patent 3,521,221
- two parallel cuts are made through the insulation, in the direction parallel to the axis of the conductor, and a short length of insulation is removed from the conductor.
- the previous forms of terminal generally have legs or beams which either have substantially parallel sides or taper in one direction, acting as cantilevers. As a conductor is pushed down between the beams or legs they are stressed, but the stress is not uniformly distributed, the stresses being concentrated at the roots of the beams, both during wire insertion and when the wire is at rest in the terminal.
- the terminals have poor elastic compliance and a high wire insertion force, with poor specific volume efficiency. Also, for insulated conductors, such terminals are often effective for only one type, or a limited number of types of insulation.
- the present invention provides a retaining member which has improved qualities and a high degree of stress uniformity.
- the retaining member has, in general terms, a pair of cantilever beams extending from a base, the beams having opposed, spaced apart, substantially parallel inner edges, each beam having upper and lower portions and an entrance portion, each lower portion having an outer edge tapered upward and inward and each upper portion having an outer edge tapered upward and outward from the lower portion, the entrance portion defined by upwardly and outwardly inclined upper edges of the beams.
- a neck is formed in each beam at the conjunction of the upper and lower portions of the beams, the necks forming pivotting positions for the upper portions relative to the lower portions when a cylindrical member is forced through the entrance portion.
- a contact embodying the present invention provides a contact which will accept a range of conductor sizes and will accept conductors having many different types of insulation, with efficient stripping properties, improved connection quality and with a high degree of stress uniformity.
- a contact indicated generally at 10, has two beams 11 and 12 extending upwardly from a base 13.
- the beams 11 and 12 have opposed inner edges 14 which are parallel and spaced apart a predetermined distance according to the wire size or sizes to be accepted, to define a slot 1 5.
- the outer edge of each beam is in two parts 16a and 16b and 17a and 17b respectively, the lower parts 16a and 16b inclined upwardly and inwardly and the upper parts 17a and 17b inclined upwardly and outwardly, the two parts of each surface conjoined at a neck position 18.
- Each beam has an upper or top edge 19 inclined upwardly and outwardly, from the slot 15, each top edge 19 is joined to the related inner edge 14 by a radius 20.
- each beam has a lower portion 11 a and 12a and upper portions 11 b and 12b respectively, the neck 18 defining the junction of the portions.
- FIGs 2, 3 and 4 illustrate certain steps in inserting a conductor into a terminal.
- an insulated conductor 25 having a conducting core 26 and an insulating layer 27 is resting on the top edges 19.
- the top parts 11 b and 12b of the beams 11 and 12 deflect outwards, in effect pivotting at the necks 18.
- the upper portions 11 b and 12b are extensively and plastically deflected or deformed past the elastic limit of the material, particularly at the neck 18, during the action of stripping the insulation, while the plastic deformation of the lower portions 11 a and 12a is minimized.
- the upper portions remain deformed, as illustrated in Figure 4, the angle between the top portion of the opposed sides 14 being ⁇ and the angle between the bottom portions of the opposed sides being 0.
- the relatively high stresses encountered during insulation stripping at the entry point are largely distributed in the upper portions 11 b and 12b with the lower portions 1 a and 12a being uniformly stressed, to a lower extent than the upper parts.
- the beams With the tapering of the lower portions, the beams have improved specific volume efficiency and an increased elastic compliance. It is the lower stressed lower portions of the beam which provide the desired wire rest point properties.
- the contact provides lower insertion forces compared to conventional designs, while at the same time providing effective insulation removal and adequate contact forces to ensure a gas-tight connection and satisfactory conductor retention.
- the present contact has independently deflecting cantilever type dual-taper beams, with dual action, as opposed to the more uniform or single taper beams previously used.
- the dual action beams provide efficient insulation stripping at low wire insertion forces without sacrificing wire rest point compliance, whereas high insertion forces occur with previous designs during insulation stripping with similar or lower rest point compliance.
- the present design permits the use of optimum tapered beams with more uniformly distributed stresses. This gives increased elastic compliance compared to previous terminals when the face end portion of each beam normally works at a lower stress than that at the base of a beam, resulting in a considerably greater permanent set in the beams.
- the contacts are rugged and cheaply produced by stamping. With improved stress distribution, thinner material and a smaller overall size can be obtained.
- Figures 5, 6 and 7, illustrate three variations or alternate arrangements of the contact as in Figure 1, and Figures 2 to 4. While in Figure 1, a single contact is illustrated, multiple forms can also be provided.
- Figure 5 illustrates a "back-to- back" arrangement with beams 11 and 12 extending from both sides of a common base 13.
- Figure 6 illustrates a strip arrangement, in which two or more contacts are formed from a long strip having a long base 13.
- Figure 7 illustrates a double contact in which the bases 13 are common with an interconnecting web 30.
- a range of conductor sizes can be accommodated by one particular size of contact, if desired, although contacts can be designed specifically for each conductor size.
- FIG 8 is illustrated a contact, as in Figure 1 and in Figures 2, 3 and 4, for acceptance of 22 AWG (.645 mm), 24 AWG (.511 mm) and 26 AWG (.409 mm) telephone wire conductors.
- the various dimensions indicated, and listed below, are for each conductor but are approximate and can be varied.
- the angle A can vary as can the radii r but the particular dimensions and values given are particular dimensions and values given are particularly suitable for telephone conductors, having copper conductors, of the gauges give. All the generally used insulating materials can be stripped, e.g. paper pulp, plastic, foam, foam skin, etc.
- the position of the neck 18 be below the junction of the radius 20 and the inner edges 14, and that the rest point of the conductor 26 is below the neck 18.
- the angle A and radius r affect the initial insertion force and the force applied to the insulation.
- the slot width f, radius r and dimension (a-b), determine both the amount of deformation of the conductor core and the bending or spreading or the legs 11 and 12, which both also depend upon the conductor size.
- a typical material is phosphor bronze, of about .012" (3.05 mm) thickness.
- the contact can be used with bare conductors. There may be reduced deformation of the beams, without the insulation, but the same basic situation occurs with deformation of the conductor occurring prior to entry into the slot 15. Similar structures can be used to retain small diameter rods or "wires" of other materials than metal, and it is possible to make the retaining member of non-metallic material, depending upon use.
Landscapes
- Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
Description
- This invention relates to retaining members having dual action cantilever beams, that is with two spaced beams between which a further member is pushed to be retained therein. Particularly, though not exclusively, the invention is applicable to contacts for electrical conductors, and more particularly to insulation displacing contacts for insulated conductors.
- Conductor contacts, and particularly insulation displacing contacts are well known, comprising generally, two spaced legs or beams, between which the conductor is pushed. Where the conductor is insulated, the insulation may be removed or displaced by crushing, cutting or slicing. In crushing the insulation is squeezed between conductor and terminal and pushed off the conductor. A typical example of such a terminal is described in U.S. patent 3,112,147. In cutting, the insulated conductor is pushed down between two cutting edges which extend in a direction normal to the axis of the conductor. In such terminals the cutting edges cut through the insulation, which may then be deformed sideways. U.S. patent 3,027,536 describes one form of such a terminal. In slicing, as described in U.S. patent 3,521,221, two parallel cuts are made through the insulation, in the direction parallel to the axis of the conductor, and a short length of insulation is removed from the conductor.
- The previous forms of terminal generally have legs or beams which either have substantially parallel sides or taper in one direction, acting as cantilevers. As a conductor is pushed down between the beams or legs they are stressed, but the stress is not uniformly distributed, the stresses being concentrated at the roots of the beams, both during wire insertion and when the wire is at rest in the terminal. The terminals have poor elastic compliance and a high wire insertion force, with poor specific volume efficiency. Also, for insulated conductors, such terminals are often effective for only one type, or a limited number of types of insulation.
- The present invention provides a retaining member which has improved qualities and a high degree of stress uniformity. The retaining member has, in general terms, a pair of cantilever beams extending from a base, the beams having opposed, spaced apart, substantially parallel inner edges, each beam having upper and lower portions and an entrance portion, each lower portion having an outer edge tapered upward and inward and each upper portion having an outer edge tapered upward and outward from the lower portion, the entrance portion defined by upwardly and outwardly inclined upper edges of the beams. A neck is formed in each beam at the conjunction of the upper and lower portions of the beams, the necks forming pivotting positions for the upper portions relative to the lower portions when a cylindrical member is forced through the entrance portion. The upper portions deflect outwards about the necks to a permanent deformation beyond the elastic limit of the material. Further forcing of the cylindrical member between the lower portions of the beam causes deflection of the lower portions, to a lesser extent than the upper portions and deforms the cylindrical member. A contact embodying the present invention provides a contact which will accept a range of conductor sizes and will accept conductors having many different types of insulation, with efficient stripping properties, improved connection quality and with a high degree of stress uniformity.
- Initial deformation of the legs occurs at the top portions when a conductor is pushed in, the insulation being removed, the bare conductor then passing down between the lower portions of the beams, being deformed thereby.
- The invention will be readily understood by the following description of certain embodiments of electrical contacts, by way of example, in conjunction with the accompanying drawings, in which:-
- Figure 1 is a perspective view of a contact in accordance with the invention;
- Figures 2, 3 and 4 illustrate successive steps in inserting a conductor into a contact as in Figure 1;
- Figures 5, 6 and 7 illustrate alternate forms of contact using the basic design as in Figure 1;
- Figure 8 illustrates a contact as in Figure 1, with the various important dimensions indicated.
- As illustrated in Figure 1, a contact, indicated generally at 10, has two
beams base 13. Thebeams inner edges 14 which are parallel and spaced apart a predetermined distance according to the wire size or sizes to be accepted, to define a slot 1 5. The outer edge of each beam is in twoparts lower parts 16a and 16b inclined upwardly and inwardly and theupper parts 17a and 17b inclined upwardly and outwardly, the two parts of each surface conjoined at aneck position 18. Each beam has an upper ortop edge 19 inclined upwardly and outwardly, from theslot 15, eachtop edge 19 is joined to the relatedinner edge 14 by aradius 20. - Thus each beam has a
lower portion 11 a and 12a andupper portions 11 b and 12b respectively, theneck 18 defining the junction of the portions. - Figures 2, 3 and 4 illustrate certain steps in inserting a conductor into a terminal. In Figure 2 an
insulated conductor 25, having a conductingcore 26 and aninsulating layer 27 is resting on thetop edges 19. On initial pushing of the conductor into the terminal past theradii 20, two events occur. Thetop parts 11 b and 12b of thebeams necks 18. - At the same time the insulation is crushed and partially pushed off of the
conductor core 26. This condition is illustrated in Figure 3, there having been some initial deformation of thecore 26 and a thin layer ofinsulation 27, seen at 27a, still on the core. Further pushing in of the conductor, past theneck position 18, removes the insulation and finishes the deformation of the core, the conductor moving down into theslot 15 betweenparts 11 a and 12a. - The
upper portions 11 b and 12b are extensively and plastically deflected or deformed past the elastic limit of the material, particularly at theneck 18, during the action of stripping the insulation, while the plastic deformation of thelower portions 11 a and 12a is minimized. The upper portions remain deformed, as illustrated in Figure 4, the angle between the top portion of theopposed sides 14 being ø and the angle between the bottom portions of the opposed sides being 0. - With the present invention, the relatively high stresses encountered during insulation stripping at the entry point are largely distributed in the
upper portions 11 b and 12b with thelower portions 1 a and 12a being uniformly stressed, to a lower extent than the upper parts. With the tapering of the lower portions, the beams have improved specific volume efficiency and an increased elastic compliance. It is the lower stressed lower portions of the beam which provide the desired wire rest point properties. The contact provides lower insertion forces compared to conventional designs, while at the same time providing effective insulation removal and adequate contact forces to ensure a gas-tight connection and satisfactory conductor retention. - As compared with previous contacts, the present contact has independently deflecting cantilever type dual-taper beams, with dual action, as opposed to the more uniform or single taper beams previously used.
- The dual action beams provide efficient insulation stripping at low wire insertion forces without sacrificing wire rest point compliance, whereas high insertion forces occur with previous designs during insulation stripping with similar or lower rest point compliance.
- The present design permits the use of optimum tapered beams with more uniformly distributed stresses. This gives increased elastic compliance compared to previous terminals when the face end portion of each beam normally works at a lower stress than that at the base of a beam, resulting in a considerably greater permanent set in the beams.
- The contacts are rugged and cheaply produced by stamping. With improved stress distribution, thinner material and a smaller overall size can be obtained.
- Figures 5, 6 and 7, illustrate three variations or alternate arrangements of the contact as in Figure 1, and Figures 2 to 4. While in Figure 1, a single contact is illustrated, multiple forms can also be provided. Figure 5 illustrates a "back-to- back" arrangement with
beams common base 13. Figure 6 illustrates a strip arrangement, in which two or more contacts are formed from a long strip having along base 13. Figure 7 illustrates a double contact in which thebases 13 are common with an interconnectingweb 30. - As previously stated, a range of conductor sizes can be accommodated by one particular size of contact, if desired, although contacts can be designed specifically for each conductor size. In Figure 8 is illustrated a contact, as in Figure 1 and in Figures 2, 3 and 4, for acceptance of 22 AWG (.645 mm), 24 AWG (.511 mm) and 26 AWG (.409 mm) telephone wire conductors. The various dimensions indicated, and listed below, are for each conductor but are approximate and can be varied. Thus the angle A can vary as can the radii r but the particular dimensions and values given are particular dimensions and values given are particularly suitable for telephone conductors, having copper conductors, of the gauges give. All the generally used insulating materials can be stripped, e.g. paper pulp, plastic, foam, foam skin, etc.
- The particular dimensions and values for Figure 8 are as follows:
- a=.1 inches (25.4 mm)
- b-.07 inches (17.78 mm)
- c-.09 inches (22.86 mm)
- d=.07 inches (17.78 mm)
- e-.05 inches (12.7 mm)
- f-.01 inches (2.54 mm)
- r-.02 inches (5.08 mm)
- λ,=120°
- As stated, it is preferred that the position of the
neck 18 be below the junction of theradius 20 and theinner edges 14, and that the rest point of theconductor 26 is below theneck 18. The angle A and radius r affect the initial insertion force and the force applied to the insulation. The slot width f, radius r and dimension (a-b), determine both the amount of deformation of the conductor core and the bending or spreading or thelegs - Cutting or other metal is minimized by the dual action beam and there is minimal reduction in conductor strength after insulation into the contact. This is true even when very thin material is used for the contact.
- While specifically described for use with insulated conductors, the contact can be used with bare conductors. There may be reduced deformation of the beams, without the insulation, but the same basic situation occurs with deformation of the conductor occurring prior to entry into the
slot 15. Similar structures can be used to retain small diameter rods or "wires" of other materials than metal, and it is possible to make the retaining member of non-metallic material, depending upon use.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA355309 | 1980-07-03 | ||
CA355,309A CA1115796A (en) | 1980-07-03 | 1980-07-03 | Retainer member with dual action cantilever beams |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0043437A2 EP0043437A2 (en) | 1982-01-13 |
EP0043437A3 EP0043437A3 (en) | 1982-09-29 |
EP0043437B1 true EP0043437B1 (en) | 1985-03-06 |
Family
ID=4117328
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19810104120 Expired EP0043437B1 (en) | 1980-07-03 | 1981-05-29 | Retainer member with dual action cantilever beams |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0043437B1 (en) |
JP (2) | JPS5730274A (en) |
CA (1) | CA1115796A (en) |
DE (1) | DE3169168D1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BR8506983A (en) * | 1984-10-17 | 1987-01-06 | Amp Inc | PROCESS AND PRODUCT FOR TERMINATION WITH SELECTED WELDING RIP |
GB2198890B (en) * | 1986-12-11 | 1992-01-08 | Johnson Electric Ind Mfg | A commutator for an electric motor |
GB2202998A (en) * | 1987-03-16 | 1988-10-05 | Johnson Electric Ind Mfg | A method of connecting an armature winding to a commutator |
GB9002172D0 (en) * | 1990-01-31 | 1990-03-28 | Raychem Sa Nv | Electrical connector |
FR2659514A1 (en) * | 1990-03-07 | 1991-09-13 | Cit Alcatel | Y-cable for adding an additional earpiece to a telephone instrument with no provision for including one |
DE4403278C2 (en) * | 1994-01-31 | 1997-12-04 | Krone Ag | IDC contact element |
US5797763A (en) * | 1994-11-29 | 1998-08-25 | Sumitomo Wiring Systems, Ltd. | Electrical connection box |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE630034A (en) * | 1962-03-26 | |||
US3521221A (en) * | 1968-02-21 | 1970-07-21 | Northern Electric Co | Insulation slicing connector |
US4084877A (en) * | 1969-10-22 | 1978-04-18 | The Siemon-Dynamic Mfg. Company | Electrical connectors and terminal connecting block |
JPS4964884A (en) * | 1972-10-31 | 1974-06-24 | ||
US4027368A (en) * | 1976-06-22 | 1977-06-07 | Amp Incorporated | Forceps tool for wire insertion |
US4062614A (en) * | 1976-07-30 | 1977-12-13 | Bell Telephone Laboratories, Incorporated | Insulation piercing slotted beam electrical connector |
AU525919B2 (en) * | 1979-01-22 | 1982-12-09 | Amp Incorporated | Flat cable connector |
-
1980
- 1980-07-03 CA CA355,309A patent/CA1115796A/en not_active Expired
-
1981
- 1981-05-29 EP EP19810104120 patent/EP0043437B1/en not_active Expired
- 1981-05-29 DE DE8181104120T patent/DE3169168D1/en not_active Expired
- 1981-06-23 JP JP9608681A patent/JPS5730274A/en active Pending
-
1990
- 1990-03-02 JP JP2054690U patent/JPH0414855Y2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPH0355662U (en) | 1991-05-29 |
EP0043437A2 (en) | 1982-01-13 |
DE3169168D1 (en) | 1985-04-11 |
CA1115796A (en) | 1982-01-05 |
JPS5730274A (en) | 1982-02-18 |
EP0043437A3 (en) | 1982-09-29 |
JPH0414855Y2 (en) | 1992-04-03 |
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