Buckles – buttons – clasps – etc. – Bale and package ties – hose clamps – Metal bands
Patent
1993-11-02
1997-04-01
Brittain, James R.
Buckles, buttons, clasps, etc.
Bale and package ties, hose clamps
Metal bands
B65D 6308
Patent
active
056154585
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for connecting at least one braid of electric cables to a connector.
More specifically, the invention relates to a clamp-type device for insuring the connection between at least a sheathing braid of an electric cable to the rear footing of a substantially cylindrical connector in optimum electric conditions.
The object of the connection of the sheathing braids of an electric cable to the rear fitting of a connector is to ensure sheathing continuity between a sheathed cable and a connector. The sheathing efficiency can be measured with the transfer impedance of the assembly constituted by the sheathing and the connector. The transfer impedance defines within a given frequency range, the contact resistance between the sheathing and the connector for said frequency range. The connection techniques whereby the connection presents an electric continuity over 360.degree. offer the best transfer impedance. The connections by clamps or ties generally ensure a good transfer impedance, the contact being very close between the fitting and the sheathing braid over a large surface. Moreover, these clamping devices are easily mounted and readily adaptable to a wide range of diameters of connectors.
Most of the clamps or tie means currently used are made in one piece and are mounted with pliers controlling the torque. European Patent Application 0 328 305 shows such a clamp.
In order to clarify the problem to be solved, the accompanying FIGS. 1 to 3 show such a type of clamp. The clamp 10 is essentially constituted by a metal band 12 of constant width, of which one end 14 is terminated by a widened and partly bent over portion, said portion being provided with a slot 16. As can be seen in FIGS. 1 and 2 showing a braid 18 to be connected, the band 12 is wrapped twice around the part 18 to be connected, thus passing twice through the slot 16. To ensure the connection, a pulling force is applied on the end 20 of the band 12, and said portion being provided with a slot 16. As can be seen in FIGS. 1 and 2 showing a braid 18 to be connected, the band 12 is wrapped twice around the part 18 to be connected, thus passing twice through the slot 16. To ensure the connection, a pulling force is applied on the end 20 of the band 12, and said end is severed as can be seen in 22.
Such a type of connection clamp presents two major disadvantages. Firstly, the widened part 14 entails a waste of material when the band is cut from the strip serving to produce a plurality of clamps. Moreover, the formation of the clamp necessitates folding operations. It should also be noted that, in the area referenced 24 of the widened portion 14 which surrounds the slot 16, the thickness of the metal is very reduced and what is more, it has been folded. There is a risk of an incipient fracture of the metal band appearing in that area if a strong clamping force is applied with the pliers. Experiments have shown that fracturing occurs around 100 kg of stress.
Document U.S. Pat. No. 3,067,640 describes a system for fastening a clamp. But it is impossible, with this system, to obtain a sufficient clamping continuity in order to produce an electric connection. Moreover, the fastening part is thick.
Document W0-A-82/02035 and document GB-A-805 763 also describe clamping systems constituted by a band and a fastening part. It is however impossible, with said systems, to obtain a sufficient clamping or a sufficiently continuous clamping surface to produce a suitable electric connection.
It is an object of the invention to overcome these disadvantages by providing a connection device of the aforesaid type which is simple and inexpensive to produce while preventing the problems of metal wasting and which also presents sufficient mechanical strength to be able to withstand clamping stresses high enough to ensure a good quality of contact strength between the connector and the sheathing braid.
This object is reached with the device for connecting at least one braid of electric cables to a substantially cylindrical connector to
REFERENCES:
patent: 3067640 (1962-12-01), Lodholm
patent: 3371390 (1968-03-01), Sieglitz, Jr.
patent: 3754303 (1973-08-01), Pollock
patent: 4646393 (1987-03-01), Young
patent: 4866817 (1989-09-01), Espevik et al.
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