Hinge assembly for electronic devices

Claim 2

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first linear track adapted to be connected to the first part of the computer; a first carriage movably mounted on said first linear track so as to move lineally along said first linear track; a first rotational joint member having a first axis of rotation independent of lineal movement by said first carriage along said first linear track and being adapted to be connected to said first carriage; a second rotational joint member having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation; a third rotational joint member having a third axis of rotation and being connected to said second rotational joint member so that said third axis of rotation intersects a line which is substantially perpendicular to said second axis of rotation and to said third axis of rotation; and a fourth rotational joint member adapted to be connected to the second part of the computer, said fourth rotational joint member having a fourth axis of rotation and being rotatably connected to said third rotational joint member so that said fourth axis of rotation and said third axis of rotation are collinear, and said fourth and third joint members rotate relative to one another about their axes of rotation, and that the second part of the computer and the first part of the computer can be rotated with respect to one another about two distinct axes.

Claim 3

The interconnection assembly of claim 1, further comprising: a fifth rotational joint member having a fifth axis of rotation and being connected to said second rotational joint member so that said fifth axis of rotation intersects said second axis of rotation; and a sixth rotational joint member connected to said third rotational joint member, having a sixth axis of rotation and being rotatably connected to said fifth rotational joint member so that said sixth axis of rotation and said fifth axis of rotation are collinear and said sixth and fifth joint members rotate relative to one another about their axes of rotation, and that the second part of the computer and the first part of the computer can be rotated with respect to one another about a third distinct axis.

Claim 4

The interconnection assembly of claim 1, further comprising: a second linear track adapted to be connected to a second part of the computer; and a second carriage movably mounted on said second linear track so as to move lineally along said second linear track, said second carriage being connected to said fourth rotational joint member, so that the second part of the computer can be moved lineally with respect to the first part of the computer on said first linear track and the first part of the computer can be moved lineally with respect to the second part of the computer on said second linear track.

Claim 5

The interconnection assembly of claim 1, wherein said interconnection assembly includes a self-releasing connector for releasably connecting the interconnection assembly to one of the first or second parts of the computer.

Claim 6

The interconnecting assembly of claim 1, wherein said first rotational joint member includes a plurality of first electrical contacts and said second rotational joint member includes a plurality of second electrical contacts corresponding to and in contact with respective first electrical contacts regardless of the relative rotational position of said first rotational joint member and said second rotational joint member, said first plurality of electrical contacts being disposed around the periphery of said first rotational joint member and said second plurality of electrical contacts being disposed on the inside of a cylindrical sleeve extending from said second rotational joint member over said first rotational joint member, so that the first pan of the computer and the second part of the computer can be rotated with respect to one another while maintaining electrical communication therebetween through said interconnection assembly.

Claim 7

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first linear track adapted to be connected to the first part of the computer; a first carriage movably mounted on said first linear track so as to move lineally along said first linear track; a first rotational joint member having a first axis of rotation and being adapted to be connected to said first carriage; a second rotational joint member having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation; a third rotational joint member having a third axis of rotation and being connected to said second rotational joint member so that said third axis of rotation intersects said second axis of rotation and is substantially perpendicular thereto; and a fourth rotational joint member adapted to be connected to the second part of the computer, having a fourth axis of rotation and being rotatably connected to said third rotational joint member so that said fourth axis of rotation and said third axis of rotation are collinear, and said fourth and third joint members rotate relative to one another about their axes of rotation, and that the second part of the computer and the first part of the computer can be rotated with respect to one another about two distinct axes.

Claim 8

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first linear track adapted to be connected to the first part of the computer; a first carriage movably mounted on said first linear track so as to move lineally along said first linear track; a first rotational joint member having a first axis of rotation and being adapted to be connected to said first carriage; a second rotational joint member having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation; a third rotational joint member having a third axis of rotation and being connected to said second rotational joint member so that said third axis of rotation intersects said second axis of rotation and is substantially perpendicular thereto; and a fourth rotational joint member adapted to be connected to the second part of the computer, having a fourth axis of rotation and being rotatably connected to said third rotational joint member so that said fourth axis of rotation and said third axis of rotation are collinear, and said fourth and third joint members rotate relative to one another about their axes of rotation, and that the second part of the computer and the first part of the computer can be rotated with respect to one another about two distinct axes.

Claim 9

The interconnection assembly of claim 6, further comprising: a second linear track adapted to be connected to a second part of the computer; and a second carriage movably mounted on said second linear track so as to move lineally along said second linear track, said second carriage being connected to said fourth rotational joint member, so that the second part of the computer can be moved lineally with respect to the first part of the computer on said first linear track and the first part of the computer can be moved lineally with respect to the second part of the computer on said second linear track.

Claim 10

The interconnection assembly of claim 7, further comprising: a fifth rotational joint member having a fifth axis of rotation and being connected to said fourth rotational joint member so that said fifth axis of rotation intersects said fourth axis of rotation and is substantially perpendicular thereto; and a sixth rotational joint member being adapted to be connected to said second carriage, having a sixth axis of rotation and being rotatably connected to said fifth rotational joint member so that said sixth axis of rotation and said fifth axis of rotation are collinear and said sixth and fifth joint members rotate relative to one another about their axes of rotation, and that the second part of the computer and the first part of the computer can be rotated with respect to one another about three distinct axes.

Claim 11

The interconnection assembly of claim 6, wherein said interconnection assembly includes a self-releasing connector for releasably connecting the interconnection assembly to one of the first or second parts of the computer.

Claim 12

The interconnecting assembly of claim 6, wherein said first rotational joint member includes a plurality of first electrical contacts and said second rotational joint member includes a plurality of second electrical contacts corresponding to and in contact with respective first electrical contacts regardless of the relative rotational position of said first rotational joint member and said second rotational joint member, said first plurality of electrical contacts being disposed around the periphery of said first rotational joint member and said second plurality of electrical contacts being disposed on the inside of a cylindrical sleeve extending from said second rotational joint member over said first rotational joint member, so that the first part of the computer and the second part of the computer can be rotated with respect to one another while maintaining electrical communication therebetween through said interconnection assembly.

Claim 13

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first linear track adapted to be connected to a first part of the computer; a first carriage movably mounted on said first linear track so as to move lineally along said first linear track; a second linear track adapted to be connected to a second part of the computer; a second carriage movably mounted on said second linear track so as to move lineally along said second linear track; a first rotational joint member having a first axis of rotation and being connected to said first carriage; and a second rotational joint member having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation, said second rotational joint member being connected to said second carriage, so that the second part of the computer can be moved lineally with respect to the first part of the computer on said first linear track, the first part of the computer can be moved lineally with respect to the second part of the computer on said second linear track, and the first part of the computer and the second part of the computer can be rotated with respect to one another.

Claim 14

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first linear track adapted to be connected to a first part of the computer; a first carriage movably mounted on said first linear track so as to move lineally along said first linear track; a second linear track adapted to be connected to a second part of the computer; a second carriage movably mounted on said second linear track so as to move lineally along said second linear track; a first rotational joint member having a first axis of rotation and being connected to said first carriage; and a second rotational joint member having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation, said second rotational joint member being connected to said second carriage, so that the second part of the computer can be moved lineally with respect to the first part of the computer on said first linear track, the first part of the computer can be moved lineally with respect to the second part of the computer on said second linear track, and the first part of the computer and the second part of the computer can be rotated with respect to one another.

Claim 15

The interconnection assembly of claim 11, wherein said interconnection assembly includes a self-releasing connector for releasably connecting the interconnection assembly to one of the first or second parts of the computer.

Claim 16

The interconnecting assembly of claim 11, wherein said first rotational joint member includes a plurality of first electrical contacts and said second rotational joint member includes a plurality of second electrical contacts corresponding to and in contact with respective first electrical contacts regardless of the relative rotational position of said first rotational joint member and said second rotational joint member, said first plurality of electrical contacts being disposed around the periphery of said first rotational joint member and said second plurality of electrical contacts being disposed on the inside of a cylindrical sleeve extending from said second rotational joint member over said first rotational joint member, so that the first part of the computer and the second part of the computer can be rotated with respect to one another while maintaining electrical communication therebetween through said interconnection assembly.

Claim 17

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first rotational joint member having a first axis of rotation and being adapted to be connected to the first part of the computer; a second rotational joint member being adapted to be connected to the second part of the computer, having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation; and a self releasing connector which is separable from said first part and said second part of said computer for releasably connecting said first rotational joint member to the first part of the computer, so that the second part of the computer and the first part of the computer can be rotated with respect to one another yet may be disconnected from one another without the aid of tools.

Claim 18

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first rotational joint member having a first axis of rotation and being adapted to be connected to the first part of the computer; a second rotational joint member being adapted to be connected to the second part of the computer, having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation; and a self releasing connector which is separable from said first part and said second part of said computer for releasably connecting said first rotational joint member to the first part of the computer, so that the second part of the computer and the first part of the computer can be rotated with respect to one another yet may be disconnected from one another without the aid of tools.

Claim 19

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first rotational joint member having a first axis of rotation and being adapted to be connected to the first part of the computer; a second rotational joint member being adapted to be connected to the second part of the computer, having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation; and said first rotational joint member including a plurality of first electrical contacts and said second rotational joint member including a plurality of second electrical contacts corresponding to and in contact with respective first electrical contacts regardless of the relative rotational position of said first rotational joint member and said second rotational joint member, said plurality of said first electrical contacts being disposed around the periphery of said first rotational joint member and said plurality of said second electrical contacts being disposed on the inside of a cylindrical sleeve extending from said second rotational joint member over said first rotational joint member, so that the first part of the computer and the second part of the computer can be rotated with respect to one another while maintaining electrical communication therebetween through said interconnection assembly, wherein said plurality of said first electrical contacts and said plurality of said second electrical contacts and said cylindrical sleeve are separable from said first rotational joint member.

Claim 20

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first rotational joint member having a first axis of rotation and being adapted to be connected to the first part of the computer; a second rotational joint member being adapted to be connected to the second part of the computer, having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation; and said first rotational joint member including a plurality of first electrical contacts and said second rotational joint member including a plurality of second electrical contacts corresponding to and in contact with respective first electrical contacts regardless of the relative rotational position of said first rotational joint member and said second rotational joint member, said plurality of said first electrical contacts being disposed around the periphery of said first rotational joint member and said plurality of said second electrical contacts being disposed on the inside of a cylindrical sleeve extending from said second rotational joint member over said first rotational joint member, so that the first part of the computer and the second part of the computer can be rotated with respect to one another while maintaining electrical communication therebetween through said interconnection assembly, wherein said plurality of said first electrical contacts and said plurality of said second electrical contacts and said cylindrical sleeve are separable from said first rotational joint member.

Claim 21

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first linear track adapted to be connected to the first part of the computer; a first carriage movably mounted on said first linear track so as to move lineally along said first linear track a first rotational joint member having a first axis of rotation and a second rotational joint member; said second rotational joint member having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation, said second rotational joint member being connected to said first carriage independent of said first rotational joint member and said first linear track, so that the second part of the computer can be moved lineally with respect to the first part of the computer on said first linear track and the first part of the computer and the second part of the computer can be rotated with respect to one another; and said first rotational joint member being adapted to be connected to a second part of the computer.

Claim 22

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first linear track adapted to be connected to the first part of the computer; a first carriage movably mounted on said first linear track so as to move lineally along said first linear track a first rotational joint member having a first axis of rotation and a second rotational joint member; said second rotational joint member having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation, said second rotational joint member being connected to said first carriage independent of said first rotational joint member and said first linear track, so that the second part of the computer can be moved lineally with respect to the first part of the computer on said first linear track and the first part of the computer and the second part of the computer can be rotated with respect to one another; and said first rotational joint member being adapted to be connected to a second part of the computer.

Claim 23

The interconnection assembly of claim 16, wherein said interconnection assembly includes a self-releasing connector for releasably connecting the interconnection assembly to one of the first or second parts of the computer.

Claim 24

The interconnecting assembly of claim 16, wherein said first rotational joint member includes a plurality of first electrical contacts and said second rotational joint member includes a plurality of second electrical contacts corresponding to and in contact with respective first electrical contacts regardless of the relative rotational position of said first rotational joint member and said second rotational joint member, said first plurality of electrical contacts being disposed around the periphery of said first rotational joint member and said second plurality of electrical contacts being disposed on the inside of a cylindrical sleeve extending from said second rotational joint member over said first rotational joint member, so that the first part of the computer and the second part of the computer can be rotated with respect to one another while maintaining electrical communication therebetween through said interconnection assembly.

Claim 25

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first rotational joint member having a first axis of rotation and being adapted to be connected to the first part of the computer; a second rotational joint member having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation; a third rotational joint member having a third axis of rotation and being connected to said second rotational joint member so that said third axis of rotation intersects a line which is substantially perpendicular to said second axis of rotation and to said third axis of rotation; and a fourth rotational joint member being adapted to be connected to the second part of the computer, having a fourth axis of rotation and being rotatably connected to said third rotational joint member so that said fourth axis of rotation and said third axis of rotation are collinear, said fourth and third joint members rotate relative to one another about their axes of rotation, so that the second part of the computer and the first part of the computer can be rotated independently with respect to one another about two distinct axes.

Claim 26

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first rotational joint member having a first axis of rotation and being adapted to be connected to the first part of the computer; a second rotational joint member having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation; a third rotational joint member having a third axis of rotation and being connected to said second rotational joint member so that said third axis of rotation intersects a line which is substantially perpendicular to said second axis of rotation and to said third axis of rotation; and a fourth rotational joint member being adapted to be connected to the second part of the computer, having a fourth axis of rotation and being rotatably connected to said third rotational joint member so that said fourth axis of rotation and said third axis of rotation are collinear, said fourth and third joint members rotate relative to one another about their axes of rotation, so that the second part of the computer and the first part of the computer can be rotated independently with respect to one another about two distinct axes.

Claim 27

The interconnection assembly of claim 19, wherein said interconnection assembly includes a self-releasing connector for releasably connecting the interconnection assembly to one of the first or second parts of the computer.

Claim 28

The interconnecting assembly of claim 19, wherein said first rotational joint member includes a plurality of first electrical contacts and said second rotational joint member includes a plurality of second electrical contacts corresponding to and in contact with respective first electrical contacts regardless of the relative rotational position of said first rotational joint member and said second rotational joint member, said first plurality of electrical contacts being disposed around the periphery of said first rotational joint member and said second plurality of electrical contacts being disposed on the inside of a cylindrical sleeve extending from said second rotational joint member over said first rotational joint member, so that the first part of the computer and the second part of the computer can be rotated with respect to one another while maintaining electrical communication therebetween through said interconnection assembly.

Claim 29

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first rotational joint member having a first axis of rotation and being adapted to be connected to the first part of the computer; a second rotational joint member having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation; a third rotational joint member having a third axis of rotation and being connected to said second rotational joint member so that said third axis of rotation intersects said second axis of rotation and is substantially perpendicular thereto; a fourth rotational joint member having a fourth axis of rotation and being rotatably connected to said third rotational joint member so that said fourth axis of rotation and said third axis of rotation are collinear, and said fourth and third joint members rotate relative to one another about their axes of rotation; a fifth rotational joint member having a fifth axis of rotation and being connected to said fourth rotational joint member so that said fifth axis of rotation intersects said fourth axis of rotation and is substantially perpendicular thereto; and a sixth rotational joint member being adapted to be connected to the second part of the computer, having a sixth axis of rotation and being rotatably connected to said fifth rotational joint member so that said sixth axis of rotation and said fifth axis of rotation are collinear and said sixth and fifth joint members rotate relative to one another about their axes of rotation and that the second part of the computer and the first part of the computer can be rotated with respect to one another about three distinct axes.

Claim 30

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first rotational joint member having a first axis of rotation and being adapted to be connected to the first part of the computer; a second rotational joint member having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation; a third rotational joint member having a third axis of rotation and being connected to said second rotational joint member so that said third axis of rotation intersects said second axis of rotation and is substantially perpendicular thereto; a fourth rotational joint member having a fourth axis of rotation and being rotatably connected to said third rotational joint member so that said fourth axis of rotation and said third axis of rotation are collinear, and said fourth and third joint members rotate relative to one another about their axes of rotation; a fifth rotational joint member having a fifth axis of rotation and being connected to said fourth rotational joint member so that said fifth axis of rotation intersects said fourth axis of rotation and is substantially perpendicular thereto; and a sixth rotational joint member being adapted to be connected to the second part of the computer, having a sixth axis of rotation and being rotatably connected to said fifth rotational joint member so that said sixth axis of rotation and said fifth axis of rotation are collinear and said sixth and fifth joint members rotate relative to one another about their axes of rotation and that the second part of the computer and the first part of the computer can be rotated with respect to one another about three distinct axes.

Claim 31

The interconnection assembly of claim 22, wherein said interconnection assembly includes a self-releasing connector for releasably connecting the interconnection assembly to one of the first or second parts of the computer.

Claim 32

The interconnecting assembly of claim 22, wherein said first rotational joint member includes a plurality of first electrical contacts and said second rotational joint member includes a plurality of second electrical contacts corresponding to and in contact with respective first electrical contacts regardless of the relative rotational position of said first rotational joint member and said second rotational joint member, said first plurality of electrical contacts being disposed around the periphery of said first rotational joint member and said second plurality of electrical contacts being disposed on the inside of a cylindrical sleeve extending from said second rotational joint member over said first rotational joint member, so that the first part of the computer and the second part of the computer can be rotated with respect to one another while maintaining electrical communication therebetween through said interconnection assembly.

Claim 33

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first rotational joint member having a first axis of rotation and being adapted to be connected to the first part of the computer; a second rotational joint member having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation; a third rotational joint member having a third axis of rotation and being connected to said second rotational joint member so that said third axis of rotation intersects said second axis of rotation and is substantially perpendicular thereto; and a fourth rotational joint member being adapted to be connected to the second part of the computer, having a fourth axis of rotation and being rotatably connected to said third rotational joint member so that said fourth axis of rotation and said third axis of rotation are collinear, at least one of said first and second and one of said third and fourth rotational joint members being elongate, and said fourth and third joint members rotate relative to one another about their axes of rotation, so that the second part of the computer and the first part of the computer can be rotated with respect to one another about two distinct axes.

Claim 34

An interconnection assembly for a portable electronic computer, the computer having a first part and a second part, comprising: a first rotational joint member having a first axis of rotation and being adapted to be connected to the first part of the computer; a second rotational joint member having a second axis of rotation and being rotatably connected to said first rotational joint member so that said first axis of rotation and said second axis of rotation are collinear and said first and second joint members rotate relative to one another about their axes of rotation; a third rotational joint member having a third axis of rotation and being connected to said second rotational joint member so that said third axis of rotation intersects said second axis of rotation and is substantially perpendicular thereto; and a fourth rotational joint member being adapted to be connected to the second part of the computer, having a fourth axis of rotation and being rotatably connected to said third rotational joint member so that said fourth axis of rotation and said third axis of rotation are collinear, at least one of said first and second and one of said third and fourth rotational joint members being elongate, and said fourth and third joint members rotate relative to one another about their axes of rotation, so that the second part of the computer and the first part of the computer can be rotated with respect to one another about two distinct axes.

Claim 35

The interconnection assembly of claim 25, wherein said interconnection assembly includes a self-releasing connector for releasably connecting the interconnection assembly to one of the first or second parts of the computer.

Claim 36

The interconnecting assembly of claim 25, wherein said first rotational joint member includes a plurality of first electrical contacts and said second rotational joint member includes a plurality of second electrical contacts corresponding to and in contact with respective first electrical contacts regardless of the relative rotational position of said first rotational joint member and said second rotational joint member, said first plurality of electrical contacts being disposed around the periphery of said first rotational joint member and said second plurality of electrical contacts being disposed on the inside of a cylindrical sleeve extending from said second rotational joint member over said first rotational joint member, so that the first part of the computer and the second part of the computer can be rotated with respect to one another while maintaining electrical communication therebetween through said interconnection assembly.

Claim 37

An electro-rotational connector, having one or more inputs and one or more outputs, comprising: at least one pair of conducting washers aligned next to one another along a longitudinal axis, one of said conducting washers being in electrical connection with one of the inputs and the other of said conducting washers being in electrical connection with one of the outputs, each of said conducting washers of said pair being adapted to rotate relative to the other of said conducting washers, and each of said conducting washers having a conducting face; and said conducting faces being disposed flat against and in electrical contact with each other regardless of the rotation of the conducting washers relative to each other, so that an electrical signal present on one of said conducting faces is communicated to the other of said conducting faces in maintaining electrical connection between said input and said output regardless of the relative rotational positions of said washers.

Claim 38

An electro-rotational connector, having one or more inputs and one or more outputs, comprising: at least one pair of conducting washers aligned next to one another along a longitudinal axis, one of said conducting washers being in electrical connection with one of the inputs and the other of said conducting washers being in electrical connection with one of the outputs, each of said conducting washers of said pair being adapted to rotate relative to the other of said conducting washers, and each of said conducting washers having a conducting face; and said conducting faces being disposed flat against and in electrical contact with each other regardless of the rotation of the conducting washers relative to each other, so that an electrical signal present on one of said conducting faces is communicated to the other of said conducting faces in maintaining electrical connection between said input and said output regardless of the relative rotational positions of said washers.