Surge lightning protection device
View Patent ↗A lightning surge protector configured for use with coaxial lines is disclosed. The lightning surge protector includes an inner conductor comprising two conductive portions mechanically and capacitively coupled together, and displaced from one another, by a dielectric material which may be injection molded or snapped onto the conductive portions. Insulating material extends between the inner conductor and an outer conductor to electrically insulate the inner conductor from the outer conductor. An inductor inductively couples the inner conductor to the outer conductor and is coupled between the two using a solderless connection. The inductor has a bent end which may be inserted in a hole in the inner conductor and a straight end that may be staked in a hole in the outer conductor. The outer conductor is formed from a case and a plug which are frictionally coupled. The configuration of the components allows for components to be assembled into modules and sub-assemblies which facilitates pressing the modules and sub-assemblies together to reduce assembly costs.
1. A surge protector for a signal receiving device configured to receive signals via a coaxial line having a signal carrying inner wire and a grounded outer conductor, the surge protector comprising:
an inner conductor exhibiting a capacitance, said inner conductor being configured for attachment to the inner wire of the coaxial line;
an outer conductor disposed about and insulated from the inner conductor, the outer conductor being configured for attachment to the outer conductor of the coaxial line;
insulating material electrically insulating the inner conductor from the outer conductor; and
an inductor electrically connected between the inner conductor and the outer conductor, said inductor having one end solderlessly attached to the inner conductor and an opposite end solderlessly attached to the outer conductor, wherein the inductor includes an inner conductor end, an outer conductor end and a coil disposed between the inner conductor and outer conductor ends, and wherein the inner conductor includes an exterior surface concentric about a longitudinal axis and includes a cylindrical wall defining a hole extending through the surface and the longitudinal axis and the inner conductor end of the inductor includes a bent portion which when inserted into the hole mechanically and electrically couples the inductor to the inner conductor.
2. The device of claim 1 wherein at least a portion of the outer conductor end of the inductor is received in a hole formed in the outer conductor.
3. A surge protector for a signal receiving device configured to receive signals via a coaxial line having a signal carrying inner wire and a grounded outer conductor, the surge protector comprising:
an inner conductor exhibiting a capacitance, said inner conductor being configured for attachment to the inner wire of the coaxial line, said inner conductor including a first conductor having a wire end and a plate, a second conductor having a device end and a plate, and a dielectric portion configured to snap fit over the plates of the first and second conductor to capacitively and mechanically couple the first and second conductors;
an outer conductor disposed about and insulated from the inner conductor, the outer conductor being configured for attachment to the outer conductor of the coaxial line;
insulating material electrically insulating the inner conductor from the outer conductor; and
an inductor inductively coupling the inner conductor and outer conductor,
wherein the inner conductor includes an exterior surface concentric about a longitudinal axis and includes a cylindrical wall defining a hole extending through the surface and the longitudinal axis and the inductor includes a bent portion which when inserted into the hole mechanically and electrically couples the inductor to the inner conductor.
4. The device of claim 3 wherein the inductor is solderlessly connected to the inner conductor.
5. The device of claim 3 wherein the insulating material includes a first insulating material insulating the first conductor from the outer conductor and a second insulating portion insulating the second conductor from the outer conductor.
6. A surge protector for a signal receiving device configured to receive signals via a coaxial line having a signal carrying inner wire and a grounded outer conductor, the surge protector comprising:
an inner conductor exhibiting a capacitance, said inner conductor being configured for attachment to the inner wire of the coaxial line, said inner conductor including an exterior surface concentric about a longitudinal axis and including a cylindrical wall defining a hole extending through the surface and the longitudinal axis;
an outer conductor disposed about and insulated from the inner conductor, the outer conductor being configured for attachment to the outer conductor of the coaxial line;
insulating material electrically insulating the inner conductor from the outer conductor; and
an inductor inductively coupling the inner conductor and outer conductor, said inductor including an outer conductor end, a coil portion and an inner conductor end including a straight section adjacent the coil coupled by a bend to a distal straight section, wherein when the inner conductor end is received in the hole, the inner conductor end is flexed to provide three points of contact between the inductor and the inner conductor.
7. The device of claim 6 wherein the inductor is solderlessly connected to the inner conductor.
8. The device of claim 6 wherein the hole is a through hole and one point of contact is on the cylindrical wall adjacent the longitudinal axis.
9. The device of claim 8 wherein the outer conductor is formed to include a cylindrical wall defining a hole and the outer conductor end is received in the hole in the outer conductor.
10. A method of manufacturing a surge protection device for a signal receiving device configured to receive signals via a coaxial line having a signal carrying inner conductor and a grounded outer conductor, the method comprising the steps of:
providing an insulated inner conductor having a first insulating portion coupled to a first conductor configured to be coupled to a signal carrying component of the signal receiving device, and a second insulating portion coupled to a second conductor
configured to be coupled to the inner conductor of the coaxial line, said first and second conductors being capacitively coupled;
providing an inductor;
providing a two component outer conductor each component of which is configured to include a cavity sized to receive one of the first and second insulating portions therein and configured to couple to the other component of the outer conductor, one component of outer conductor being configured to be coupled to an outer conductor of the coaxial line and the other component being configured to be coupled to a ground of the signal receiving device;
inserting the first insulating portion of the insulated inner conductor into the cavity of a selected one of the components of the outer conductor;
electrically connecting the inductor between the insulated inner conductor and the selected one of the components of the outer conductor;
inserting the second insulating portion of the insulated inner conductor into the cavity of the other component of the outer conductor;
coupling the two components of the outer conductor whereby the inner conductor is electrically insulated from, but inductively coupled to, the outer conductor,
wherein the provided inductor includes an inner conductor end and an outer conductor end, the provided insulated inner conductor includes an inductor-receiving hole, the selected component of the outer conductor includes an inductor-receiving hole and wherein the coupling the inductor step includes the steps of inserting the inner conductor end into the inductor-receiving hole of the insulated inner conductor and inserting the outer conductor end into the inductor-receiving hole of the selected component of the outer conductor.
11. The method of claim 10 wherein the provided insulated inner conductor includes dielectric material mechanically and capacitively coupling the first conductor to the second conductor,
and wherein the step of providing the insulated inner conductor includes the step of simultaneously molding the first insulating portion and the second insulating portion to the first and second conductors.
12. The method of claim 2 wherein the step of providing the insulated inner conductor includes the step of simultaneously molding the first insulating portion, the second insulating portion and the dielectric material to the first and second conductors.
13. The method of claim 10 wherein the inserting the outer conductor end into the inductor-receiving hole of the selected component of the outer conductor step and the inserting the first insulating portion of the insulated inner conductor into the cavity of a selected one of the components of the outer conductor step are performed simultaneously.
14. The method of claim 13 wherein one component of the provided two component outer conductor is a case having a cavity therein and the other component of the provided two component outer conductor is a plug configured to be received in the cavity of the case.
15. The method of claim 14 wherein the plug is the selected component.
16. The method of claim 10 wherein the inner conductor end of the provided inductor includes a bent portion and wherein the inserting the inner conductor end into the inductor-receiving hole step causes deformation of the bent portion to generate a restorative force acting to couple the inductor to the inner conductor.
17. The method of claim 10 and further comprising the step of staking the outer conductor end of the inductor into the inductor-receiving hole.
18. The method of claim 10 wherein the providing the insulated inner conductor step includes the step of casting the first and second conductors.
19. The method of claim 10 wherein the providing the two component outer conductor step includes the step of casting the two components.
20. The method of claim 10 wherein the coupling the two components of the outer conductor step includes the step of pressing the other component onto the selected component.
21. The method of claim 20 wherein the inserting the second insulating portion of the insulated inner conductor into the cavity of the other component of the outer conductor step and the coupling the two components of the outer conductor step are performed simultaneously.
22. The method of claim 10 wherein the inserting the inner conductor end into the inductor-receiving hole of the insulated inner conductor is performed prior to the inserting the outer conductor end into the inductor-receiving hole of the selected component of the outer conductor to form an inner conductor subassembly.
23. The method of claim 22 wherein following the forming an inner conductor sub-assembly step, the inserting the first insulating portion of the insulated inner conductor into the cavity of a selected one of the components of the outer conductor step and the inserting the outer conductor end into the inductor-receiving hole of the selected component of the outer conductor step are performed to form a subassembly.