Electrical connectors – Contact comprising cutter – Insulation cutter
Patent
1995-11-29
1999-05-04
Swann, J. J.
Electrical connectors
Contact comprising cutter
Insulation cutter
439427, 439578, H01R 1704
Patent
active
058997695
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device as claimed in the pre-characterizing portion of claim 1.
Devices of this type make it possible to connect a coaxial cable to an electronic device which itself is connected to the two contacts in the enclosure by means of any type of lead arrangements, such as a component conductor or even coaxial cable.
With a prior art device of this type (U.S. Pat. No. 4,761,146), the first contact is in the form of a thin-walled sleeve having an inside diameter corresponding to the diameter of the inner conductor of the coaxial cable. The second contact is in the form of a thin-walled, hollow cylinder coaxial to the first contact and having an inside diameter corresponding to the diameter of the insulation between the inner conductor and the cable shield of the coaxial cable. That end of the hollow cylinder facing the coaxial cable forms a point and protrudes beyond the first, inner contact toward the coaxial cable.
To connect the coaxial cable to the contacts in the enclosure of the prior art device, a section of the cable shield on one end of the cable is first exposed by making a cut in the outer insulating sleeve of the cable and peeling it back over the section. The exposed section of the shield is then folded back over the coaxial cable and a hollow cylinder having the same shape as the second contact is attached to a special tool and inserted between the cable shield and the insulation surrounding the inner conductor of the coaxial cable while simultaneously twisting the cable back and forth to separate a length of the cable shield from this insulation and make space for the second contact. Inside the device enclosure, the coaxial cable with the exposed inner insulation is threaded and fed into the second contact. The first contact slides along the inner conductor between the conductor and the insulation, seating one end section of the conductor to form a contact, while the second contact, just as the hollow cylinder of the tool previously, makes contact with the cable shield and slides between the same and the insulation surrounding the inner conductor. The insert previously placed over the cable is then pushed along the coaxial cable into the cavity surrounding the device and clamped in the enclosure by means of the clamping nut, which had likewise been previously placed on the cable. During this clamping process, a shoulder in the inner bore of the insert is pressed against the layers of the coaxial cable surrounding the second contact, i.e. the shield and the outer insulation, clamping these layers against the second contact, thus fixing the cable with respect to the enclosure.
With the device of the prior art, a significant amount of work is required to connect the coaxial cable, which can only be reliably effected by means of a special tool.
The object of the current invention is to create a device as claimed in the pre-characterizing portion of the principal claim which makes it possible with a substantially lesser amount of work to reliably connect a coaxial cable which has been cut cleanly across the perpendicular to the longitudinal axis, without special tools and without any other manipulation of the cable as such other than simple cutting off the end.
The above-mentioned object is achieved by means of the characterizing features disclosed in claim 1.
With the device as claimed by the current invention, the coaxial cable, which has cut by means of a wire cutter or similar device so as to have a clean, even cut surface, is inserted into the inner bore of the insert, which has been inserted into the enclosure and is held in place by means of a clamping nut, until the tip of the pin penetrates a short way into the preferably multi-strand inner conductor. After insertion of the cable, the clamping nut is tightened, drawing the insert and also the coaxial cable closer to the contact pin. By so doing, the thrust faces of the insert bend the contact studs of the second contact toward its circumferential clamping plane. The effect of this bending is that the tab ends approach
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patent: 3744007 (1973-07-01), Horak
patent: 3977752 (1976-08-01), Freitag
patent: 5052946 (1991-10-01), Homolka
patent: 5068248 (1991-11-01), Gaver, Jr. et al.
patent: 5318458 (1994-06-01), Thorner
Konetschny Volker
Petram Gunter
Pruftechnik Dieter Busch A.G.
Swann J. J.
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