Electrical connectors – Metallic connector or contact also having securing part... – Multipart assembly
Patent
1994-06-10
1995-08-29
Desmond, Eugene F.
Electrical connectors
Metallic connector or contact also having securing part...
Multipart assembly
H01R 410
Patent
active
054455448
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a wire end ferrule according to the preamble of claim 1.
PRIOR ART
Wire end ferrules of the generic type are disclosed in DE 2,941,770 C2 or DE 3,314,295 C1. Such wire end ferrules are used to produce solderless electrical connections, a crimping tool being used to press or crimp the stripped end of a conductor to the wire end ferrule. Such a crimping tool is shown, for example, in DE 2,614,577 B1.
Wire and ferrules consist of a front cylindrical metal tube or a metal sleeve having, integrally extruded or plugged thereon, a rear plastic collar as insulating sleeve. The stripped part of the finely stranded conductor is inserted into the wire end ferrule from behind into the plastic collar, and crimped in the region of the metal sleeve, resulting in the permanent connection. The rear integrally extruded plastic collar accommodates the conductor with the insulation as insulating sleeve.
The different diameters or dimensions of wire end ferrules are laid down in DIN 46 228 Part 4. In this case, the cylindrical plastic collar and the front cylindrical metal tube are dimensioned such that in each case only one conductor can be properly inserted and crimped.
When conductors are mounted on switchboxes, as indicated, for example, in FR 1,468,859, FIG. 1, it frequently happens that a plurality of conductors have to be simultaneously screwed onto a switch terminal. For this purpose, it is known for two conductors to be inserted into a wire end ferrule which fits in some shape or other, in order to be mounted jointly on a supply terminal. In this case, the cross-section of the metal tube is selected such that this corresponds approximately to twice the conductor cross-section of the litz wires, so that the latter can be inserted. If such a cylindrical cross-section of the metal tube is selected, the associated cylindrical plastic collar of this wire end ferrule is dimensioned in such a way that it cannot accommodate two juxtaposed conductors. It therefore has to be brought by means of mechanical deformation into an oval shape whose dimensional variations are not, however, adapted to juxtaposed conductors. Moreover, it is possible only with difficulty for such a deformation process of the plastic collar to be automated.
If a plastic collar is selected which has an inside diameter corresponding to two juxtaposed conductors, the cross-section of the associated metal tube generally has excessive dimensions.
In known wire end ferrules, it is therefore disadvantageous that in the case of small switching devices or terminals it is impossible, or possible only with difficulty, to underclamp two conventional wire end ferrules in order to continue the electrical connection.
ADVANTAGES OF THE INVENTION
The wire end ferrule according to the invention having the characterizing features of claim 1 has, by contrast, the advantage that said ferrule is configured in such a way that it can accommodate two conductors without any problem, without having to undertake a mechanical deformation of the plastic collar. Here, the invention proceeds from the finding that adapting the cross-sectional ratios of the metal tube and the metal sleeve must be performed in such a way that the latter in each case comprises a circular cylindrical cross-section which can accommodate two conductor ends twisted one in another, while the oval cross-section of the adjoining plastic collar is dimensioned such that said collar can accommodate the two conductors in a juxtaposed fashion. A geometrical reshaping of the wire end ferrules is necessary to this extent, that is to say the circular cylindrical cross-section of the metal tube largely corresponds to twice the cross-section of the stripped conductor, while the plastic collar of oval cross-section has to accommodate two juxtaposed conductors with their insulating wrappers.
Further details of the invention are represented in the drawing and explained in more detail in the following exemplary embodiment.
FIG. 1 shows a plan view of the wire end ferrule, half cut away
REFERENCES:
patent: 2526277 (1950-10-01), Rogoff
patent: 2729695 (1956-01-01), Pierce
patent: 2774810 (1956-12-01), Ritter
patent: 2982808 (1961-05-01), Schwfster
patent: 3184817 (1965-05-01), Archer et al.
patent: 3868475 (1975-02-01), Allison
patent: 4404744 (1983-09-01), Stenz et al.
patent: 4969845 (1990-11-01), Hauchard et al.
DIN 46 228 Part 4. Sep. 1990, pp. 1-4.
Froehlich Hans
Geier Claus
Leonhardt, deceased Herbert
Weiland Bruno
Desmond Eugene F.
GLW- Elektrotechnische Bauteile-Kunststoffverarbeitung GmbH
Zoller & Froehlich GmbH
LandOfFree
Wire end ferrule does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wire end ferrule, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wire end ferrule will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1816623