US 4,128,823 A · Switch

Abstract

A switch is disclosed comprising two sets of rod-shaped fixed electrodes formed of a magnetic material and one cylindrical moving electrode formed of a permanent magnet, each set of the fixed electrodes being fixed to the respective end of a cylindrical vessel so that the ends of each set of the fixed electrodes face the ends of the other set of the fixed electrodes with the moving electrode capable of reciprocating between the ends of the two sets of fixed electrodes inside the cylindrical vessel. The moving electrode is comprised of at least one adhesive layer of a metal selected from the group consisting of silver, nickel, copper and alloys thereof on the surface of the permanent magnet, and at least one contact layer of a metal selected from the group consisting of rhodium, wolfram, rhenium, ruthenium and alloys thereof, silver-wolfram, gold-chromium on the adhesive layer of metal. At least the permanent magnet of the moving electrode and the adhesive layer of metal are thermally diffused with each other.

Claims23

Dependent claims

A switch comprising two sets of rod-shaped fixed electrodes formed of a magnetic material and one cylindrical moving electrode formed of a permanent magnet, each set of the fixed electrodes being fixed to the respective end of a cylindrical vessel so that the ends of each set of the fixed electrodes face the ends of the other set of the fixed electrodes with the moving electrode capable of reciprocating between the ends of the two sets of fixed electrodes inside the cylindrical vessel, wherein said moving electrode is formed of a rare earth element-cobalt type permanent magnet which comprises at least one adhesive layer of a metal selected from the group consisting of silver, nickel, copper and alloys thereof on the surface of said permanent magnet, and at least one contact layer of a metal selected from the group consisting of rhodium, wolfram, rhenium, ruthenium and alloys thereof, silver-wolfram and gold-chromium on said adhesive layer of metal, and at least said permanent magnet and said adhesive layer of metal are thermally diffused to each other.

A switch, comprising:

an elongated vessel having two ends;
two sets of end electrodes, one of said sets being mounted at each of the ends of said vessel;
a permanently magnetized elongated electrode consisting essentially of at least one rare earth element selected from the group consisting of samarium, cerium, and praceodymium, and a metal selected from the group consisting of cobalt and both cobalt and iron, said elongated electrode being a cylinder having a ratio of to diameter in the range of 0.3 to 1.0, being contained within said vessel, and being linearly movable between said pairs of height end electrodes;
at least one adhesive layer affixed to said elongated electrode, each of said at least one adhesive layers being a metal selected from the group consisting of silver, nickel, copper, and alloys of these metals, at least one of said at least one adhesive layers being thermally diffused;
and
at least one contact layer affixed to said elongated electrode, each of said at least one contact layers being a metal selected from the group consisting of rhodium, wolfram, rhenium, ruthenium, allows of these metals, silver-wolfram, and gold-chromium.

3 more elements

Dependencies are inferred from the claim text.

Switch

Life of this patent

Switch

Life of this patent

Abstract

Claims23