US1920553A - Connecting means for screened cables - Google Patents

Description

Aug' 1, 1933- G. FossATl Y coNNcTING MEANS FOR SCREENED CABLES Filed Feb. 25, 1931 Patented Aug. 1, 1.933

, plszosss l coNNEcTmG MEANS Foa scaEENED CABLES Giuseppe Fossati, Monza, Italy, assignor to Fabbrica Italiana Magneti Marelli Societa Anonima., Milan, Italy Application February 25.,

1931, Serial No; 518,188,

and in Italy March 1, 1930 4 Claims.

The present invention has for its object means for connecting the grounding screen of screened cables feeding electric current to ignition sparking plugs of internal combustion engines, with the screen of the current distributor of a cooperating ignition device such as a magneto or a spark-generator; said means providing a satisfactory electric contact of the cable and distributor screens with each other Without aiiecting 0 the freedom of said cable to move and adapt itselfwith respect to said distributor.

On the annexed drawing is shown by way of example an embodiment of the present invention in connection with a magneto having a screened distributor cover or hood, and

Figure 1 is a central section on enlarged scale of the cable connecting end having a connecting member according to this invention;

Figure 2 is a fragmentary section of the screened cover of a magneto distributor having a cable provided with the connecting member of this invention engaged therein.

The connecting member comprises a conducting and longitudinally resilient and collapsible sleeve which is located on the end portion of 4the cable, this end portion having previously been deprived of its screening sheath; said sleeve has one end engaged with the cable screening sheath and its opposite end carries an annular head adapted to move along said cable end portion and to contact with the screen of the magneto or of the distributor cover of the same.

The cable end is fastened in the distributor after said sleeve has been collapsed and' while it `is held colapsed, and thus a permanent and satisfactory electric contact is secured between the magneto screen and the head of said sleeve, the cable screening sheath being thereby efliciently grounded.

In the illustrated embodiment of this invention the cable comprises a feeding conductor 1 and an insulating cover 2 having thereon a screening sheath 3 consisting of wire braid or, the like. The screening sheath 3 is removed from the end portion of the cable and a conducting sleeve 4 is located thereon, said sleeve consisting in the illustrated embodiment of a section of a flexible metal tube which is collapsible or has a proper resiliency in the direction of its axis. Said sleeve 4 has one end fastened on a collar 6, say by soldering it thereon, and said collar 6 is fastened on sheath 3 by crimpling it thereon by Y means of pliers as shown at '7 in Figure 2, a soft 55 packing, as a rubber ring 8, being preferably located intermediate sheath 3 and cover 2 for seal-` ing purposes.

An annular ball head 9 is Welded or fastened in any suitable manner on the opposite or free end of said sleeve 4 said annular head being thus free to move along the insulating cover 2.

For interconnection with the magneto, the end portion of the cable is cut to leave a portion 2 thereof extending beyond the position the head 9 has on said cable when said sleeve 4 has its normal elongated configuration, said extending portion being shorter than the depth of the seat or recess loof the magneto cover it is intended to enter; then said bare end, portion of the cable is inserted and forced home or fully into the seat 10 of the magneto distributor cover 5 and is fastened thereon by means of a screw 11 which enters said cable to provide electric connection of vsegmental contact l2 with the cable conductor 1 and at the same time mechanically engages 75 said cable in the cover seat 10.

In this operation, assuming the sectio'n 2 to have a suitable length as above defined, when the cable end is engaged in seat 10, the-conducting sleeve 4 is compressed and collapsed intermediate the point 7 Where it is anchored on the cable screening sheath and the s eat 13 provided in the magneto distributor cover 5 for head 9 and lined by metal screen 14 located on the cover 5, said head 9 being thus resiliently held in en- 85 gagement with said seat 13.

Thus by a singleoperation both the connections of the cable conductor l with the cooperating segment l2 of the distributor, and the connection of the cable screening sheath 3 with the 90 magneto screen 14 are secured, the last named connection being provided by the collapsed sleeve 4; on the other hand the cable may adjust itself angularly around its seat in the magneto, because saidhead 9 is ball-shaped and may move 95 along the cable.

Of course, the resilient collapsible and conducting member 4 may be of any suitable nature instead of being a corrugated collar or tube as illustrated and it may consist of a spring or generally speaking of a conducting member adapted to resiliently collapse in the direction of its own axis, and its engagement on the cable screening sheath may be secured by any suitable means, say by a collar or a split-ring fastener or the like.

What I claim as my invention and desire to secure by United States Letters Patent isz- 1. Means for connecting a cable having a.

Vscreening sheath thereon, with a screened mem- V Vber in ignition means for internal combustion engines, said connecting means comprising a resilient conducting member enclosing the cable and encircling the end portion of said cable and having one end fastened on said cable sheath at a point spaced from the cable end. and its other end loose on said cable for engagement with said screened member and an annular ball head on the last named end of said resilient member.

2 eans for connecting a cable having a scree ing sheath thereon, with a screened member in ignition means for internal combustion engines', said connecting means comprising a ilexible and collapsible metal tube enclosing the cable and encircling the end portion of said ca.- ble and having one end fastened on said cable sheath at a point spaced from the cable end and screened member.

' 4. Means for connecting a cable having a screening sheath thereon with a screened member in ignition means for internal combustion engines, said connecting means comprising a resiliently collapsible conducting member enclosing said cable and comprising a collar engaging said cable screening sheath at the inner end of said resiliently collapsible conducting member and an annular contact member upon the opposite end of said resiliently collapsible conducting member, said resiliently collapsible conducting member forcing said contact member against said screened member to make electrical contact with its screening means when said cable ls con- GUSEPPE FOSSATI.

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