Two-dimensional electric conductor designed to function as an electric switch

• US 4,876,419 A
• Filed: 06/02/1988
• Issued: 10/24/1989
• Est. Priority Date: 06/02/1987
• Status: Expired due to Fees

• Current Assignee: LEDA Logarithmic Electrical Devices For Automation SRL
• Original Assignee: LEDA Logarithmic Electrical Devices For Automation SRL
• Inventors: Lodini, Paolo
• Primary Examiner(s): Tolin, Gerald P.
• Application Number:
  US07/201,598
• Time in Patent Office: 509 Days
• Field of Search: 340/665, 340/666, 340/667, 200/85 R, 200/85 A, 200/86 R, 200/86 A, 200/61.41, 200/61.43, 307/119, 338/114, 338/99, 338/100, 338/112
• US Class Current: 200/86.00R
• CPC Class Codes: H01H 1/029 comprising conducting material dispersed in an elastic support or binding material
• CPC Class Codes: H01H 3/141 Cushion or mat switches

Abstract

A conductor comprising a first and second electric conducting element, each in the form of a flat plate, and at least a third electric conducting element also in the form of a flat plate. The first and second conducting elements are arranged with one surface contacting a surface on the third conducting element; and a spacer element formed from insulating material is placed between the mating surfacese of two of the aforementioned conducting elements, so as to at least partially shield the aforementioned surfaces. The structure of the material from which the third electric conducting element is formed comprises a supporting matrix formed from flexible, electrically-insulating material and particles of electrically-conductive material scattered in random, substantially uniform manner inside cells on the aforementioned matrix; which cells communicate at least partially with one another, and are at least partially larger in size than the respective particles of electrically-conductive material housed inside the same.

Claims

1. A two-dimensional electric conductor comprising a first and a second electric conducting element, each in the shape of at least a portion of a flat plate, at least one resilient electric conducting element in the shape of a flat plate and arranged in stacked relationship with said first and second conducting elements, and a spacer element formed from electrically-insulating material and also arranged in stacked relationship with said conducting elements, said spacer element being faced to a surface of said at least one resilient conducting element so as to partially shield said surface;

the structure of the material from which said at least one resilient electric conducting element is formed comprising a supporting matrix formed from flexible, electrically-insulating material and particles of electrically-conductive material scattered in a random, substantially uniform manner inside cells in said matrix;

said cells communicating at least partially with one another and being at least partially larger in size than the respective particles of electrically-conductive material housed inside the same, so that said at least one resilient electric conducting element is able to selectively assume, in response to a localized pressure exerted on a portion of said conductor, a first, unwarped shape in which said surface of at least one said resilient conducting element is kept spaced apart from at least one of the other conducting elements of the conductor by said spacer element, and a second, warped shape in which said surface of at least one said resilient conducting element contacts, through said spacer element, at least one of the other conducting elements of the conductor, so as to complete an electrical circuit with said first and second conductors.

2. An electric conductor as claimed in claim 1, characterised by the fact that the said particles consist of granules of electrically-conductive material.

3. An electric conductor as claimed in claim 1, characterised by the fact that the said spacer element is located between the adjacent surfaces of the said third conducting element and one of the said first and second conducting elements.

4. An electric conductor as claimed in claim 1, characterised by the fact that it comprises a pair of the said third electric conducting elements;

the said spacer element being located between the adjacent surfaces of the said third elements.

5. An electric conductor as claimed in claim 1, characterised by the fact that each of the said first and second conducting elements defines a series of strips lying in the same plane;

the said third conducting element being located over the said strips, and the said spacer element being located between the said strips and the said third element.

6. An electric conductor as claimed in claim 1, characterised by the fact that each of the said first and second electric conducting elements consists of a wire mesh.

7. An electric conductor as claimed in claim 1, characterised by the fact that the said spacer element consists of a mesh of insulating material.