Title: Loading coil assemblies for communications cables

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Claims: What is claimed is:

1. A loading coil assembly, comprising:

an inner casing including first and second end discs, a disc at each end of the casing;

a first support disc mounted on said first end disc and spaced axially therefrom in said casing;

a plurality of assembled loading coil magazines in said casing, said magazines extending axially and spaced circumferentially around the axis of said casing, mounting means at each end of each magazine, the mounting means at one end of each magazine engaging with the periphery of said first support disc;

a second support disc adjacent to said second end disc, said mounting means at the other end of each magazine engaging with the periphery of said second support disc;

cable entry and attachment means, attached to said first end disc;

a further casing enclosing said inner casing and spaced therefrom; and

expanded synthetic resin electrically insulative material filling spaces in said inner casing and between said inner casing and said further casing.

2. An assembly as claimed in claim 1, further including a heat shrinkable plastic sheath over said cable entry and attachment means and over at least that part of the further casing adjacent to said cable entry and attachment means.

3. An assembly as claimed in claim 1, further including:

a plurality of standoffs attached to said first end disc;

a ring supported on said standoffs, said ring entering circumferentially around said first support disc and spaced radially therefrom;

a further plurality of assembled loading coil magazines supported at one end of said ring;

a further ring extending circumferentially around said second end disc and spaced radially therefrom, said further plurality of assembled loading coil magazines supported at their other ends on said further ring.

4. An assembly as claimed in claim 1, further including:

a plurality of rings supported from said first end disc, and surrounding said first support disc;

a plurality of assembled loading coil magazines supported at one end of each magazine on each of said rings;

a further plurality of rings surrounding said second support disc, the assembled loading coil magazines supported at their other ends on said further rings, the magazines positioned in a series of concentric circles about the axis of the loading coil assembly.

5. An assembly as claimed in claim 4, said rings and said first support disc in a common plane.

6. An assembly as claimed in claim 4, said further rings and said second support disc in a common plane.

7. An assembly as claimed in claim 1, each of said loading coil magazines comprising:

a body member of a length of preformed electrically insulated material having a channel shaped cross section including a base web, two spaced apart side webs extending from said base web, and a top web on an upper part of a first one of said side ends, said top web extending inwardly over and spaced from said base web;

at least one terminal strip on said top web and including terminals thereon;

a plurality of loading coils positioned side by side in said body member, the axes of said coils parallel and extending normal to said base web, each end of the winding of the coil attached to a related terminal;

an end cap on each end of said body member, each end cap including an outwardly extending formation for engagement with a support structure.

8. A loading coil assembly as claimed in claim 7, including a further web at the top of a second one of said side webs, said further web extending in a direction away from said base web, and slots in said further web, said slots adapted for the acceptance of conductors for attachment to said terminals.

9. A loading coil assembly as claimed in claim 7, including an insulating sleeve around at least each alternatie coil.

10. A loading coil assembly as claimed in claim 7, said top web including inturned edges to define a shallow channel cross-section, said terminal strip being sliding fit in said channel.

11. A loading coil assembly as claimed in claim 7, said terminal strip extending the full length of said body member.

12. A loading coil assembly as claimed in claim 7, including a plurality of terminal strips, a strip for each coil.

13. An assembly as claimed in claim 1, said cable entry and attachment means comprising:

an inlet tube attached to said first end disc and extending axially therefrom;

a cable end entered into said inlet tube, the cable end including a metal sheathing around the conductors of the cable and a protective sheathing around said metal sheathing;

said metal sheathing removed at said cable end for a length to expose the conductors, the conductors entering the casing and connected to said loading coils in said case;

said protective sheathing removed to expose a short length of the end of said metal sheathing, the ends of said metal sheathing and said protective sheathing positioned within said tube;

a layer of sealing compound over said protective sheathing;

a lead sleeve over said layer of sealing compound and extending part way over said exposed length of said metal sheathing and crimped onto said cable end, an end of said sheathing soldered to said exposed length of metal sheathing.

14. An assembly as claimed in claim 7, said further casing including an end cap on an inner end of said further casing, said end cap including a tubular extension extending over said tube extending from said end plate.

15. An assembly as claimed in claim 14, said heat shrinkable plastic sheathing extending over said lead sleeve, said end cap and said tubular extension of said end cap.

Other info:

Inventors: Debortoli, George (Ottawa, CA, US)
Chase, Peter McGivery (Ottawa, CA, US)
Lukas, Helmut H. (Carleton Place, CA, US)

Application Number: 615773
Filing Date: 1975-09-22
Publication_date: 1976-07-13
Assignee: Northern Electric Company Limited (Montreal, CA)
Primary Class(es): 178/46 174/70R, 336/65, 336/90
Other Classes:
US Patent Ref:

1103130	Jul, 1914	Horner et al.	178/45.
1768240	Jun, 1930	Falk	178/46.
3134854	May, 1964	Martin et al.	178/46.
3691294	Sep, 1972	Charles	178/46.
3838213	Sep, 1974	Georgopulos et al.	178/46.
3845435	Oct, 1974	Georgopulos	336/65.
3865980	Feb, 1975	Moser et al.	333/1.

Other Refs:
Primary Examiner: Chatmon, Jr., Saxfield
Assistant Examiner:
Attorney: Jelly; Sidney T.