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Force Balance Capsule

IP.com Disclosure Number: IPCOM000092573D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 72K

Publishing Venue

IBM

Related People

Jakubowski, M: AUTHOR

Abstract

A fluid-operated force balance capsule having flexible diaphragms between successive stages improves the efficiency and accuracy in digital-to-analog conversion systems. Capsule 1 has a plurality of diaphragms 2 supported in cylindrical cavities 3 by coaxially arranged pistons 4 on common shaft 5. The dimensions of the respective cavities 3 and pistons 4 are selected so that the effective areas of successive pistons are in the ratio (2/n+1/ - 1)/(2/n-1/) for the n/th/ and the (n+ 1)/th/ pistons. A force along the axis of the piston assembly is generated when selected cavities are pressurized by fluid supplied in ducts 6 from a reference binary pressure.

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Force Balance Capsule

A fluid-operated force balance capsule having flexible diaphragms between successive stages improves the efficiency and accuracy in digital-to-analog conversion systems. Capsule 1 has a plurality of diaphragms 2 supported in cylindrical cavities 3 by coaxially arranged pistons 4 on common shaft 5. The dimensions of the respective cavities 3 and pistons 4 are selected so that the effective areas of successive pistons are in the ratio (2/n+1/ - 1)/(2/n-1/) for the n/th/ and the (n+ 1)/th/ pistons. A force along the axis of the piston assembly is generated when selected cavities are pressurized by fluid supplied in ducts 6 from a reference binary pressure. Since the forces generated in the individual pressurized cavities are additive and the effective areas of the pistons are in the ratios stated above, the resultant force is proportional to the binary number represented by 1's in binary positions corresponding to the pressurized cavities and 0's in all other positions. The smallest cavity for which n= 0 represents the least significant binary unit. Another cavity 7 is provided for counteracting piston 8 also on shaft 5. The effective area of piston 8 depends upon the magnitude of the binary pressure used and the range of analog pressure to be balanced. The analog pressure is supplied to the cavity by duct 9.

Diaphragms 2 are 0.001'' to 0.002'' thick and flexible so that a minute imbalance between the forces of the binary and analog pressures produces displacement of the piston-shaft assembly relative to housing assembly 10 in the direction of the larger force. A sensing device of any desired type such as flapper 11 and nozzle 12 can be used to detect displacement. Adjustable spring 21 is added betw...