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Browse Prior Art Database

Pneumatic Trigger and Binary Counter

IP.com Disclosure Number: IPCOM000092744D
Original Publication Date: 1967-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 4 page(s) / 71K

Publishing Venue

IBM

Related People

Noll, MR: AUTHOR

Abstract

Fluid logic devices using flexible diaphragm control chambers provide a reversible counter and reversing control device.

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Pneumatic Trigger and Binary Counter

Fluid logic devices using flexible diaphragm control chambers provide a reversible counter and reversing control device.

The fluid-actuated bistable trigger of the counter is shown at A and comprises two Nand's. Fluid flows from high pressure source Ps through two paths. One Path is through restriction 1, parallel input signal diaphragm control Chambers Ch 2...6, and restriction 7 to a low Pressure sump Pa, such as atmosphere. In the written text a Chamber is designated Ch plus the numeral of the drawing. The second path is from source Ps through series diaphragm control Ch's 8 and 9 to sump Pa. The restrictions are constructed to provide a pressure approximately 70%, of the supply Ps between restrictions 1 and 7. In the absence of control pressures, the diaphragm of Ch 9 is pushed against its ridge so that flow through Ch 9 is blocked and the pressure in the output ducts between Ch's 8 and 9 reaches substantially that of the supply.

This condition persists until either Ch's 2, 3, 5, and 6 or 4, 5, and 6 receive concurrent high pressure input signals to block flow through them and apply Ps to close the diaphragm of Ch 8. Ch 9 becomes unblocked because its control pressure then bleeds to Pa and the pressure in the output ducts also bleeds to Pa. The output pressure of the first Nand circuit can thus be made to fluctuate between a high and low pressure by controlling the input pressure to Ch's 2...6. The output pressure is an inversion of the concurrent input pressures.

Input signals are applied at terminals 10 and 11. A reset signal can be applied at terminal 12. The normal pressure is high and the input and reset signals are low-pressure deviations. In the absence of input signals, Ch's 2, 3, 5, and 6 can all be assumed closed so that the pressure in the output ducts is low. Ch's 13 and 14 of the second Nand are also closed while Ch 15 can be assumed open and Ch 16 is also open because of the low pressure output from the first Nand. Since Ch 16 is open, Ch 18 is closed and the output is high which is fed back to close Ch's 6 and 15.

When a low-pressure input signal occurs at either terminal 10 or 11, Ch 2 or 3 is open. Ch 4 is already open because of the low output feedback. This condition closes Ch 9 so that the Nand output goes high at terminal 19 and closes Ch 4 by feedback through volume delay 20. The delay insures that the effect of open Ch's 2 or 3 does not cut off before switching is complete. With the Nand output high, Ch 16 is closed so that, with Ch 15 already closed, the second Nand switches its output to a low pressure. The low pressure appears at output terminal 21, opens Ch 15 after a delay, and opens Ch 6. The first Nand can now maintain a high-pressure output after the input signals terminate. The second Nand provides a low-pressure output. A succeeding low-pressure input signal at either terminal 10 or 11 opens Ch's 2 or 3 and 13 or 14. Since Ch 15 is open concurrently with 13...