Stock material or miscellaneous articles – Hollow or container type article
Patent
1996-03-04
1998-07-07
Nold, Charles
Stock material or miscellaneous articles
Hollow or container type article
188 111, 340454, F16D 6552
Patent
active
057765642
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates generally to the structural design of plug connectors, and more particularly to the structural design of a single-pin or multi-pin plug connector, whose housing envelopes the contact elements and the insulated electric conductors attached thereto. Plug connectors of this sort are used, for example, for indicators used to monitor the thickness of brake linings in motor vehicles. Usually, these plug connectors are located at one end of a single-core or multi-core cable, at whose other end the actual wear sensor is arranged. In manufacturing such an indicator, one end of the conductor or conductors is first equipped with the sensor element, and the other end of the conductor or conductors is provided with contact elements. A plastic housing is then extruded on around the sensor element; a plug-connector housing, generally made of a thermoplastic material, is extruded on in the same way at the end provided with the contact elements For example, see German Laid Open Print 25 35 265 B1, and German Provisional Patent 39 04 673 A1.
To allow for the temperatures that occur in the proximity of the brake when working with monitoring devices of this type, a high-temperature-resistant plastic, such as polytetrafluoroethylene (PTFE), is generally used as insulation for the electric conductors (See, e.g., German 33 24 865 C1). However, the polar properties of this plastic and of similar fluorinated ethylene polymers make it difficult to imperviously anchor the plug-connector-side housing to the conductor insulation.
The present invention is therefore directed to the problem of developing a single-pin or multi-pin plug connector that can be used in high temperature applications, and has the plug-connector-side housing imperviously anchored to the conductor insulation.
SUMMARY OF THE INVENTION
To devise an impermeable connection between electric conductors having an insulation of a fluorinated ethylene polymer or between a jacketed cable having a sheath of fluorinated ethylene polymer and a housing of thermoplastic material extruded on at the plug-connector end, the present invention provides for an external coating of a thermoplastic material to be applied to the insulation of the conductors or to the sheath. This measure guarantees that the thermoplastic material of the plug-connector housing can enter into an integral connection with the likewise thermoplastic material of the coating during the extrusion process.
Since the difficulty described above is encountered, in particular, when working with conductor insulations or cable sheaths of high-temperature resistant plastics, which are subjected to a service temperature of at least about 120.degree. C., plastics based on polybutylene terephthalate or polyamide come under consideration, in particular, for the housing of the plug connector, while the coating of the insulation or of the sheath can consist of a thermoplastic elastomer on a polyester basis or of a softly set polypropylene. Plastics of this type are commercially available .
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 depicts a side view of an exemplary embodiment of the present invention.
FIG. 2 depicts a front view of the exemplary embodiment of the present invention shown in FIG. 1.
FIG. 3 depicts a cross-section of the exemplary embodiment of the present invention shown in FIGS. 1 and 2.
DETAILED DESCRIPTION
FIG. 1 shows a plug connector, whose housing 2 is extruded around two insulated conductors 1. As shown in FIG. 2, pin-type contact elements 3 are arranged at the ends of the insulated conductors 1. As illustrated by FIG. 3, the insulated conductors 1 are introduced with mutual clearance into the plug-connector housing 2 and directly surrounded by the material injected into the injection mold when manufacturing the plug connector. Here, a polyamide-based mixture is used as a material for the plug connector housing.
The inserted insulated conductors 1 each consist of a bunched conductor 11 having an insulation 12 of a fluorinated ethylene po
REFERENCES:
patent: 3905668 (1975-09-01), Gee
patent: 5207299 (1993-05-01), Feldmann
patent: 5513726 (1996-05-01), Thompson et al.
Prospectus of PM Fahrzeugteile--Car Parts, 1987 2 pp.
Nold Charles
Siemens Aktiengesellschaft
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