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# Fluid Logic and Circuit

IP.com Disclosure Number: IPCOM000096597D
Original Publication Date: 1963-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 52K

IBM

## Related People

Meier, JH: AUTHOR

## Abstract

This circuit has a flexible reed 1 extending through contiguous chambers 2 and 3 and buckled by endwise compression. When in a stable position as shown, reed 1 serves as a valve substantially sealing off inlet ports 4 and 5 from chambers 2 and 3, respectively. If pressure fluid is supplied to 4 alone, insufficient force is developed to move reed 1. But if pressure fluid is supplied to 4 and 5 concurrently, reed 1 moves toward an unstable position denoted by broken lines. As reed 1 passes over outlet port 6 in chamber 2, pressure fluid from 4 discharges into 6. Meanwhile, a bleed port 7 bleeds off any leakage from 5 across the reed. For reed 1 to return from unstable position to stable position, the dimension x must be smaller than y.

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Fluid Logic and Circuit

This circuit has a flexible reed 1 extending through contiguous chambers 2 and 3 and buckled by endwise compression. When in a stable position as shown, reed 1 serves as a valve substantially sealing off inlet ports 4 and 5 from chambers 2 and 3, respectively. If pressure fluid is supplied to 4 alone, insufficient force is developed to move reed 1. But if pressure fluid is supplied to 4 and 5 concurrently, reed 1 moves toward an unstable position denoted by broken lines. As reed 1 passes over outlet port 6 in chamber 2, pressure fluid from 4 discharges into 6. Meanwhile, a bleed port 7 bleeds off any leakage from 5 across the reed. For reed 1 to return from unstable position to stable position, the dimension x must be smaller than y. All sine and half-sine curves forming the walls of the chambers 2 and 3 have equal or about equal slopes at their end points.

Assume the reed stiffness, cavity configuration, etc., are modified so reed 1 switches to unstable position when port 5 alone, as well as 4 and 5 concurrently, are charged. If neck 8 between chambers 2 and 3 is wide enough, the device acts as a combined fluid diode and And. That is, it permits fluid flow from 5 to 6 if port 5 alone is charged. It permits flow from 4 to 6 if both 4 and 5 are charged.

A bleed port, not shown, can be provided from chamber 2 opposite in let 4. This bleeds off leakage across the upper part of reed 1 and assures prompt dumping of fluid from outlet 6, when ree...