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Bounceless Multiple Contact Switch

IP.com Disclosure Number: IPCOM000093563D
Original Publication Date: 1967-Nov-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Caswell, A: AUTHOR [+2]

Abstract

The multiple contact switch operates one pair of contacts among many closely spaced contacts without interference between them and without contact bounce. A pair of MYLAR* diaphragms 11 and 12 is separated by a predetermined volume of fluid under pressure. Diaphragms 11 and 12 have different tensions applied to them in accordance with predetermined operational characteristics. Diaphragms 11 and 12 have electrical circuits printed on them which terminate at oppositely disposed contact points on the respective diaphragms. *Trademark of E. I. Du Pont de Nemours and Co.

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Bounceless Multiple Contact Switch

The multiple contact switch operates one pair of contacts among many closely spaced contacts without interference between them and without contact bounce. A pair of MYLAR* diaphragms 11 and 12 is separated by a predetermined volume of fluid under pressure. Diaphragms 11 and 12 have different tensions applied to them in accordance with predetermined operational characteristics. Diaphragms 11 and 12 have electrical circuits printed on them which terminate at oppositely disposed contact points on the respective diaphragms. *Trademark of E. I. Du Pont de Nemours and Co.

The viscous fluid separating diaphragms 11 and 12 not only damps out undesirable oscillations caused by the spring characteristics inherent in such diaphragms, but serves as insulation between contacts. A plunger or actuator is located in alignment with each pair of contacts so that selection of the desired pair of contacts for closure can be made via the actuator.

When a particular pair of contacts is operated, the fluid displaced by such pair serves to separate other contact pairs preventing accidental actuation of more than one pair of contacts. The sealed environment prevents contamination of the contact surfaces as well as preventing contamination of the viscous fluid. Additional damping can be obtained using viscous damping fluid on the opposite sides of the pair of MYLAR diaphragms in addition to the fluid between them.

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