Electricity: conductors and insulators – Conduits – cables or conductors – Combined
Patent
1994-08-12
1996-08-20
Nimmo, Morris H.
Electricity: conductors and insulators
Conduits, cables or conductors
Combined
174 75R, 174 75C, 439578, 439585, H02G 1502
Patent
active
055480888
DESCRIPTION:
BRIEF SUMMARY
This invention relates to electrical conductor terminating arrangements which are especially, but not exclusively, applicable to the termination of electrical conductors in electrical connectors of the coaxial type.
The invention is especially directed to an improved conductor terminating arrangement in a coaxial connector of the kind facilitating the ready and effective connection of the usual central conductor of an incoming coaxial cable to contact means (e.g. pin contact) of the connector without the need for crimping and/or other tools.
A coaxial connector is known from U.S. Pat. No. 3,761,870 in which the central conductor is secured to a clamping member by the action of an axial force which is exerted upon assembly of the connector by means of a nut which is threadably connected to the connector body,. The nut causes a clamping member to be axially displaced which clamping member has a bevelled end surface which cooperates with the periphery of a mushroom shaped resilient dielectric element which has a through channel that fits over the clamping member. The axial force causes radial inward depression on the clamping member to effect clamping of the conductor. When the axial pressure is removed, for example upon the disassembly of the connector, the radially inward depression is terminated and the electrical and mechanical integrity between the clamping member and the conductor is no longer maintained and they are easily separable.
Another coaxial connector is known from U.S. Pat. No. 3,847,463 in which the central conductor is secured within a collet having a bevelled end. This is effected by cooperation with a collet closer which has a bevelled recess, conforming with the bevel of the collet, the two bevelled surfaces cooperating upon relative axial displacement into engagement to clamp the conductor. The relative axial displacement is effected during assembly of the connector by screwing action between a cable nut and an outer conductor. The clamping action is dependent upon the axial force exerted by the relative axial displacement and removal of that axial force by unscrewing of the cable nut permits the separation of the collet and collet closer thereby failing to maintain electrical and mechanical integrity between the collet and the conductor.
The present invention seeks to provide a connector which electrical and mechanical integrity is maintained when an axial clamping force is removed so that the connector can be disassembled without that integrity being sacrificed.
According to the present invention there is provided an electrical conductor terminating arrangement, comprising an electrically conductive contact-making means for receiving a conductor, an axially displaceable means which when displaced over the contact making means in a direction axially of the contact making means exerts a radial force on the contact making means to secure the conductor by pressure engagement, characterised in that the contact, making means and axially displaceable means are adapted to ensure retentive mutual engagement therebetween when the axially displaceable means is displaced axially over the contact making means to provide ongoing radial pressure engagement between the contact making means and the electrical conductor in order to maintain electrical and mechanical integrity therebetween without the need for continuance of axial pressure on the axially displaceable means.
By ensuring that the axially displaceable means and contact making means are mutually retentively secured after axial displacement then the electrical and mechanical integrity of the connection of the contact means to the conductor is ensured even when the connector is disassembled.
In carrying out the present invention the displaceable means may comprise a resilient or non-resilient sleeve member which when displaced axially exerts an inward radial force on the contact-making means located within the sleeve member and which co-operates with the contact-making means positioned over the electrical conductor to provide the aforesaid ong
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patent: 3846738 (1974-11-01), Nepovim
patent: 3847463 (1974-11-01), Hayward et al.
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patent: 4902246 (1990-02-01), Samchisen
patent: 5340332 (1994-08-01), Nakajima et al.
Gray Ian J.
White Melvin D.
ITT Industries Limited
Nimmo Morris H.
Peterson Thomas L.
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