Electrical connectors – With insulation other than conductor sheath – Plural-contact coupling part
Reexamination Certificate
1999-03-23
2001-02-27
Bradley, Paula (Department: 2839)
Electrical connectors
With insulation other than conductor sheath
Plural-contact coupling part
Reexamination Certificate
active
06193559
ABSTRACT:
BACKGROUND OF THE INVENTION
a) Field of the Invention
The invention is directed to a jack plug with a contact tip which is provided at the free end and followed by a connection part which is received by a tubular shaft of the jack plug, wherein the contact tip is electrically insulated from the shaft and the shaft has, at the side remote of the contact tip, a handle part through which the connecting cable runs.
b) Description of the Related Art
Jack plugs of this type are known in many constructional forms. All of them share the common feature that they have a shaft with an onion-shaped contact or contact tip provided at one end of the shaft and a handle part at the other end of the shaft. In every case, the contact tip has a contact needle which is received by the shaft and is electrically insulated therefrom. The center conductor of the connecting cable is fixed at this contact needle so as to be connected therewith in an electrically conducting manner. For this purpose, a bore hole of short length is provided in the contact needle at the handle end, wherein the conductor to be connected is inserted into this bore hole. The conductor can be connected with this bore hole in an engagement through the agency of material or by deformation. Further, it is known to squeeze in the conductor between the inner end of the contact needle and the insulating sleeve enclosing the contact needle. Further, it is already known to arrange a clamping screw at the inner end of the Contact needle, wherein the center conductor mentioned above can be connected by means of this clamping screw. Examples for all of these constructions are shown in the following published materials: AT-PS 2 935; AT-PS 6 395; AT-S 22 389; AT-PS 43 309; AT-PS 115 980; DE-PS 561 322; DE 38 34 172 A1; DE 42 27 921 A1; DE 44 14 012 C1; U.S. Pat. No. 3,656,089; U.S. Pat. No. 4,018,501; U.S. Pat. No. 4,275,946; U.S. Pat. No. 4,275,947; U.S. Pat. No. 4,335,930; U.S. Pat. No. 4,647,135; U.S. Pat. No. 2,878,459.
Two-pole connector plugs of the kind mentioned above, known as jack plugs or, in English, phone plugs, originate from telephone technology and at present are used chiefly in music electronics and electroacoustics as economical and robust plugs in unbalanced circuits, as they are called, e.g., electric guitars, instruments, sound pickups or electronic musical instruments such as synthesizers and keyboards. The accompanying cable is usually coaxial with an inner conductor of stranded wire, a rather sturdy low-impedance insulation, preferably made from polyethylene, an outer conductor arranged over this insulation in the form of a shielding braid or a shielding spiral (braided shielding or spiral shielding) covered by a plastic jacket for protecting the cable.
OBJECT AND SUMMARY OF THE INVENTION
A primary object of the invention is to provide a way for these types of plugs, many millions of which are manufactured every year and in which even minor reductions in cost therefore have great economic significance, to be manufactured more economically and also connected (fastened) substantially more quickly. A further object of the invention is to achieve a substantial reduction in parts and a drastically simplified assembly.
In accordance with the invention, a jack plug has a contact tip provided at the free end and followed by a connection part which is received by a tubular shaft of the jack plug. The contact tip with the connection part is electrically insulated from the shaft. At the side remote of the contact tip, the shaft has a handle part through which the connecting cable runs. The connection part which is formed in one piece with the contact tip has a bore hole which penetrates it over its entire length and which extends into the interior of the contact tip. The conductor of the cable to be connected can be secured in the interior of the contact tip by a material engagement or a positive engagement (crimping). The portion of the bore hole located in the contact tip is filled with a solder and, if required, with flux, A zone of the handle part is grooved or knurled on its inner side. This zone is narrowed in diameter by radial squeezing (crimping) after the cable to be connected is inserted.
An embodiment example of the invention is explained more fully with reference to the drawing, without the invention being limited to the embodiment example shown therein.
REFERENCES:
patent: 2610223 (1952-09-01), Puerner
patent: 2878459 (1959-03-01), Barker
patent: 3145329 (1964-08-01), Deakin et al.
patent: 4275947 (1981-06-01), Takagi
patent: 4335930 (1982-06-01), Feldman
patent: 4938717 (1990-07-01), Lau
patent: 4414012 (1995-06-01), None
Bradley Paula
Ngandjui Antoine
Reed Smith LLP
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