Static dissipative touch device

• US 4,586,106 A
• Filed: 05/20/1985
• Issued: 04/29/1986
• Est. Priority Date: 08/24/1984
• Status: Expired due to Term

• Current Assignee: Thomas G. Frazier
• Original Assignee: Thomas G. Frazier
• Inventors: Frazier, Thomas G.
• Primary Examiner(s): Moose, Jr., Harry E.
• Application Number:
  US06/735,870
• Time in Patent Office: 344 Days
• Field of Search: 361/212, 361/214, 361/215, 361/216, 361/219, 361/220, 361/222, 174/5 R, 174/5 G, 174/6, 174/35 R, 428/922, D14/114, D14/115, D18/12, D19/99, 340/365 E, 340/365 R, 364/189, 200/304, 200/305
• US Class Current: 361/212
• CPC Class Codes: H05F 3/02 by means of earthing connections

Abstract

A static dissipative touch device is provided for discharge of static electricity. The device is attached directly or immediately adjacent to electronic equipment which is susceptible to damage from static electricity. The device is electrically conductive and is readily contacted by the user of the equipment prior to use, to drain off the static electricity and discharge it to ground.

Claims

1. A static dissipative touch device for use in combination with electronic equipment for protecting said equipment from electrical damage of the type comprising

a non-conductive base layer;

an electrically conductive layer applied to said base layer;

grounding means connecting said conductive layer to ground; and

means for applying said device to the housing of said equipment the improvement comprising forming said base layer of a pliant, polymeric material and forming said conductive layer as a static dissipative layer by depositing an electrically conductive polymer material on said base layer as said static dissipative layer.

10. A touch device as defined in claim 1 in which

said grounding means includes an insulated eyelet with a non-insulated ring terminal in electrical contact with said conductive layer, and

an insulated wire connecting said ring terminal to ground.

11. A touch device as defined in claim 10 in which

a resistor is provided connected to said wire between said non-insulated ring terminal and said ground to prevent electrical flash back.

12. A touch device as defined in claim 1 in which

said means for applying consists of an adhesive layer on said base layer.

2. A static dissipative touch device for use in combination with electronic equipment for protecting said equipment from electrical damage, comprising a non-conductive base layer and an electrically static dissipative layer applied to said base layer, wherein the base layer and static dissipative layer are in the form of an elongated, rectangular touch bar, and wherein a leg portion extends from said bar and forms a continuation thereof, the bar and leg providing an offset "T" shaped configuration;

grounding means connecting said static dissipative layer to ground, said grounding means being connected to said leg portion; and

means for applying said device to the housing of said equipment.

3. A touch device as defined in claim 2 in which

said bar and said leg have a protective coating thereon.

4. A touch device as defined in claim 2 in which

said base layer consists of a pliant, polymeric material.

5. The touch device as defined in claim 4, wherein said conductive layer is formed by depositing electrically conductive ink on said base layer.

6. The touch device as defined in claim 5, wherein said conductive ink consists essentially of vinyl acrylic polymer and carbon black.

7. The touch device as defined in claim 5, wherein said conductive layer consists of polymethyl methacrylate and carbon black.

8. The touch device as defined in claim 5 having an additional layer of non-conductive ink applied to said conductive layer as a protective layer.

9. The touch device as set forth in claims 5, 6, or 7 wherein said conductive layer of said device has a resistance of from 1.66 to 30 megohms/square for a 1/4"-1/2" width bar with a length 3"-15" from ground, to provide a surface resistance at any point on the bar between 20 and 900 megohms.