Electrical connectors – With circuit component or comprising connector which fully... – Termination circuit
Reexamination Certificate
1998-03-18
2001-02-27
Bradley, Paula (Department: 2833)
Electrical connectors
With circuit component or comprising connector which fully...
Termination circuit
C439S922000
Reexamination Certificate
active
06193556
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electrical terminal.
DESCRIPTION OF BACKGROUND ART
In the telecommunications field, it is necessary to create a large number of semi-permanent electrical connections between wire pairs. Such connections are usually made with releasable connectors such as shown in our earlier British Patent applications Nos. GB-A-2293699 and GB-A-2303500. The former shows the arrangement in which such connectors, sold by us under the Trade Mark “Mini Rocker” are arranged, i.e. in parallel strips of ten connectors. It is necessary to arrange the connectors in a compact array such that the entire apparatus does not occupy an excessive volume, in view of the large number of wire pairs to be connected.
Telephone lines are often suspended above ground where they are susceptible to lightning strike. Lines are also at risk of contact with electrical power cables, whether above or below ground. This means that it is often necessary to provide surge protection for telecommunications contacts. Heretofore, our Mini Rocker connectors have been fitted with surge protection as and where necessary by providing a plug-in module above the Mini Rocker array which contains individual surge arrestors and contacts adapted to extend into test access points and make contact with the internal insulation displacement connectors.
SUMMARY OF INVENTION
The present invention seeks to provide a more permanent arrangement of the surge arrestors which does not inhibit access to the test points. Difficulties arise in doing so in that the closely spaced nature of the electrical terminals inhibits the physical room available for the arrestor. Furthermore, a large number of wire pairs needs to be accommodated between the terminals, further inhibiting the dimensional requirements of the terminal.
The present invention therefore provides an electrical terminal comprising a pair of longitudinally disposed contact members, each having a pair of insulation displacement connectors, one at either end thereof, thereby to link two wire pairs, wherein each contact member comprises a contact arm each extending in a defined direction, the contact arms leading to a pair of arrestor contacts spaced so as to accept a surge arrestor.
Preferably, the defined direction is substantially transverse to the contact members. This enables the surge arrestor to be placed to one side of the electrical terminal, avoiding interference with ingoing and outgoing wires and avoiding inhibiting access to test points.
The contact members are preferably parallel within the electrical terminal.
The arrestor contacts are preferably spring contacts, thereby to enable replacement of the arrestor. The contact arms more preferably end at the spring contacts.
In a particularly preferred embodiment, the contact arms are non-unitary with the contact members but are joined thereto. This join can be by way of a lug extending from the edge of one of the two members and engaging within a slot of the other member. This provides a particularly simple but effective electrical contact. The lug is preferably on the contact members, thereby placing the slot on the contact arms. This also avoids the need to bend a single-piece blank, thereby risking damage to or distribution of the insulation displacement connector.
The terminal will ideally be enclosed within a plastics housing, and this will preferably comprise a recess for receiving the surge arrestor, the arrestor contacts extending into the recess.
The above electrical terminals can be arranged in a linear array, in which case there is preferably an earth strip associated with the linear array from which extend a plurality of earth contacts into the recesses of the plastics housings.
In another aspect of the present invention, it provides an electrical terminal comprising a pair of longitudinally disposed contact members, each having a pair of insulation displacement connectors, one at either end thereof, thereby to link two wire pairs, wherein each contact member comprises a contact arm extending in a defined direction and leading to a pair of arrestor contacts spaced so as to accept a surge arrestor, the contact arms being noncontiguous with the contact members but joined thereto.
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A. C. Egerton Limited
Bradley Paula
Gushi Ross
Lahive & Cockfield LLP
Laurentano Anthony A.
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