EP1564846A1 - Stiftaufbau eines Steckers - Google Patents

Stiftaufbau eines Steckers Download PDF

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Publication number
EP1564846A1
EP1564846A1 EP04003381A EP04003381A EP1564846A1 EP 1564846 A1 EP1564846 A1 EP 1564846A1 EP 04003381 A EP04003381 A EP 04003381A EP 04003381 A EP04003381 A EP 04003381A EP 1564846 A1 EP1564846 A1 EP 1564846A1
Authority
EP
European Patent Office
Prior art keywords
bottom wall
neck
prong
plastic material
arc
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Withdrawn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
EP04003381A
Other languages
English (en)
French (fr)
Inventor
Tun-Li Su
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.)
Gem Terminal Industry Co Ltd
Original Assignee
Gem Terminal Industry 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 Gem Terminal Industry Co Ltd filed Critical Gem Terminal Industry Co Ltd
Priority to EP04003381A priority Critical patent/EP1564846A1/de
Publication of EP1564846A1 publication Critical patent/EP1564846A1/de
Withdrawn legal-status Critical Current

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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
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/40—Securing contact members in or to a base or case; Insulating of contact members
    • H01R13/405—Securing in non-demountable manner, e.g. moulding, riveting

Definitions

  • the present invention relates to a prong structure of a plug.
  • a plug is generally coupled with a receptacle for supplying power to an electric appliance or the like.
  • a typical plug includes at least two prongs made of conductive metal. The prongs are supported by an inner frame.
  • the prongs are placed in a mold, and molten plastic material is poured into the mold, forming an inner frame that is bonded with the prongs. A semi-product is thus formed after hardening of the plastic material.
  • a housing is then formed to provide a final plug product. Torque testing is carried out to test the bonding strength between the inner frame and the prongs. Namely, the anti-torque characteristic has become one of the specifications of the plug. It is, therefore, an important issue to the manufacturers to provide reliable bonding between the prongs and the inner frame and to provide a plug with better anti-torque characteristic.
  • DE 38 40 140 C2 discloses a prong structure 1 including a neck 11 that is rolled before it is covered by the plastic material for forming the inner frame. After rolling, a patterned annular groove 111 is defined in the neck 11.
  • the annular groove 111 includes recessed portions and protruded portions, providing improved bonding between the neck 11 and the plastic material before complete hardening of the plastic material for forming the inner frame.
  • DE 196 27 335 C1 discloses a prong structure 2 including a neck 21 that is rolled before it is covered by the plastic material for forming the inner frame. After rolling, a plurality of patterned annular grooves 211 are defined in the neck 21.
  • the respective annular groove 211 includes recessed portions and protruded portions, providing improved bonding between the neck 21 and the plastic material before complete hardening of the plastic material for forming the inner frame.
  • the prongs are covered by the plastic material in a more compact manner before complete hardening of the plastic material. Further, the prongs have improved anti-torque characteristic after hardening of the plastic material. Thus, the prongs would not become loosened, assuring safety during use of the plug.
  • the present invention provides a prong structure including a neck to be covered by a plastic material before hardening of the plastic material for forming an inner frame, characterized in that the neck includes an arc-shaped bottom wall that has a center offset from a longitudinal axis of the prong.
  • the neck includes a crescent cutout delimited by the arc-shaped bottom wall.
  • the neck includes an annular groove having a bottom wall, and wherein a crescent cutout is defined in a portion of the bottom wall and delimited by the arc-shaped bottom wall.
  • Fig. 11 is a perspective view of the plug in accordance with the present invention and an inner frame.
  • Fig. 12 is a final product of a plug in accordance with the present invention.
  • a prong structure 3 in accordance with the present invention generally comprises a neck 31 on an end thereof.
  • the prong structure 3 is substantially cylindrical and made of a conductive metal.
  • At least two prong structures 3 are placed in a mold, and molten plastic material is poured into the mold, forming an inner frame 4 that is bonded with the prongs 3.
  • a semi-product is thus formed after hardening of the plastic material, as shown in Fig. 11.
  • a final plug product 5 (Fig. 12) is obtained after a wire-attaching process and formation of a housing.
  • the neck 31 is the portion that is covered by the plastic material before hardening of the plastic material for forming the inner frame 4.
  • the neck 31 includes a crescent cutout 312. As illustrated in Fig. 4, in this embodiment, the crescent cutout 312 is delimited by an arc-shaped bottom wall 311 that has a center (X') offset from a longitudinal axis (X) of the prong 3.
  • the neck 31 is covered by a plastic material 313 (Fig. 6) for forming the inner frame 4 (Fig. 11) in the above-mentioned injection molding process.
  • the bonding effect between the arc-shaped bottom wall 311 and the inner frame 4 is improved before and after hardening of the plastic material 313 for forming the inner frame 4. This is because the arc-shaped bottom wall 311 has a center X' offset from a longitudinal axis X of the prong 3. Further, the inner frame 4 thus formed provides improved anti-torque effect.
  • Figs. 7 through 10 illustrate a modified embodiment of the invention, wherein the neck 31A of the prong 3A includes an annular groove 314A having a bottom wall 310A.
  • a crescent cutout 312A is defined in a portion of the bottom wall 310A.
  • the crescent cutout 312A is delimited by an arc-shaped bottom wall 311A that has a center X' offset from a longitudinal axis X of the prong 3A, as shown in Fig. 8.
  • the neck 31 A is covered by a plastic material 313A (Fig. 10) for forming an inner frame 4 (Fig. 11) in the above-mentioned injection molding process.
  • the bonding effect between the arc-shaped bottom wall 311A and the inner frame 4 is improved before and after hardening of the plastic material 313 for forming the inner frame 4. This is because an arc-shaped bottom wall 311A has a center offset X' from the longitudinal axis X of the prong 3. Further, the inner frame 4 thus formed provides improved anti-torque effect.
  • the quality of the plug 5 having the prong structure 3, 3A in accordance with the present invention is stable through provision of the arc-shaped bottom wall 311, 311A that has a center X' offset from a longitudinal axis X of the prong 3, 3A.
  • the anti-torque characteristic of the plug meets the safety requirements.
  • Another advantages of the arc-shaped bottom wall 311, 311A are that the bonding effect between the arc-shaped bottom wall 311, 311 A and the inner frame 4 is improved before and after hardening of the plastic material 313, 313A for forming the inner frame 4 and that the frame 4 thus formed provides improved anti-torque effect.
  • the crescent 312, 312A receives the plastic material before hardening, providing products with a stable structure.

Landscapes

  • Injection Moulding Of Plastics Or The Like (AREA)
EP04003381A 2004-02-16 2004-02-16 Stiftaufbau eines Steckers Withdrawn EP1564846A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04003381A EP1564846A1 (de) 2004-02-16 2004-02-16 Stiftaufbau eines Steckers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04003381A EP1564846A1 (de) 2004-02-16 2004-02-16 Stiftaufbau eines Steckers

Publications (1)

Publication Number Publication Date
EP1564846A1 true EP1564846A1 (de) 2005-08-17

Family

ID=34684697

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04003381A Withdrawn EP1564846A1 (de) 2004-02-16 2004-02-16 Stiftaufbau eines Steckers

Country Status (1)

Country Link
EP (1) EP1564846A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2256868A1 (de) 2009-05-27 2010-12-01 Siemens Aktiengesellschaft Automatisierungsgerät mit einem Terminalmodul

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5078103A (en) * 1989-12-14 1992-01-07 Doduco Gmbh & Co. Ignition distributor for internal combustion engines
DE20315436U1 (de) * 2003-10-08 2003-12-24 GEM TERMINAL IND. CO., LTD., Lu-Chu Hsiang Stiftaufbau eines Steckers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5078103A (en) * 1989-12-14 1992-01-07 Doduco Gmbh & Co. Ignition distributor for internal combustion engines
DE20315436U1 (de) * 2003-10-08 2003-12-24 GEM TERMINAL IND. CO., LTD., Lu-Chu Hsiang Stiftaufbau eines Steckers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2256868A1 (de) 2009-05-27 2010-12-01 Siemens Aktiengesellschaft Automatisierungsgerät mit einem Terminalmodul

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