Electric current contact

Claim 2

An electric switch comprising: an axially movable switching rod, and a resilient annular fixed contact which is in permanent axially sliding contact with said switching rod and connects said switching rod electrically conductively with the circuit to be closed and opened by said switch; said fixed contact comprising a stationary annular metal holder surrounding said switching rod, and a stationary zigzag folded metal strip bent in the shape of a closed ring and supported in said holder between said holder and said switching rod; and the parts of the zigzag folded metal strip extending substantially tangentially in respect of the switching rod and being forced against said switching rod by their resiliency, said zigzag folded metal strip parts joining each other, at the inner circumference of the ring formed by said zigzag folded metal strip, in pairs with sharp folds of 180* and thereby lying substantially against each other in pairs throughout the major portion of their length.

Claim 3

An electric switch comprising: an axially movable switching rod having a cylindrical outer surface and an annular fixed contact which is in sliding contact with said outer surface of the switching rod to connect said switching rod in electrically conductive relation with a circuit to be closed and opened by said switch; said fixed contact comprising a stationary metal holder having an annular recess surrounding said switching rod, and a zigzag metal strip seated in said recess to form an annulus surrounding and engaging said switching rod; said annular recess presenting a cylindrical surface concentric with said outer surface of the switching rod and spaced radially therefrom by a predetermined distance; and the zigzag folding of said metal strip presenting strip parts of which adjacent pairs thereof are joined at the inner circumference of said aNnulus along acute folds and in which adjacent strip parts are joined at the outer circumference of said annulus along cylindrical bent portions, said cylindrical bent portions and said acute folds being parallel with said cylindrical bent portions engaging said cylindrical surface of said holder and said acute folds engaging said cylindrical outer surface of said switching rod, and each strip part being of a length between said acute bends and said cylindrical bent portions which is greater than said predetermined distance between the outer surface of said switching rod and said cylindrical surface of said holder whereby said strip parts are urged outwardly by said switching rod forcibly into contact with said cylindrical surface and resiliently into contact with said switching rod.

Claim 4

An electric switch comprising: an axially movable switching rod having a cylindrical outer surface and an annular fixed contact which is in sliding contact with said outer surface of the switching rod to connect said switching rod in electrically conductive relation with a circuit to be closed and opened by said switch; said fixed contact comprising a stationary metal holder having an annular recess surrounding said switching rod, and a zigzag metal strip seated in said recess to form an annulus surrounding and engaging said switching rod; said annular recess presenting a cylindrical surface concentric with said outer surface of the switching rod and spaced radially therefrom by a predetermined distance; and the zigzag folding of said metal strip presenting strip parts of which adjacent pairs thereof are joined at the inner circumference of said aNnulus along acute folds and in which adjacent strip parts are joined at the outer circumference of said annulus along cylindrical bent portions, said cylindrical bent portions and said acute folds being parallel with said cylindrical bent portions engaging said cylindrical surface of said holder and said acute folds engaging said cylindrical outer surface of said switching rod, and each strip part being of a length between said acute bends and said cylindrical bent portions which is greater than said predetermined distance between the outer surface of said switching rod and said cylindrical surface of said holder whereby said strip parts are urged outwardly by said switching rod forcibly into contact with said cylindrical surface and resiliently into contact with said switching rod.

Claim 5

The electric switch according to claim 2 wherein said acute folds dispose adjacent pairs of said strip parts in contact with each other substantially throughout their lengths.