US3636967A - Control of fluidic devices - Google Patents

Control of fluidic devices Download PDF

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US3636967A
US3636967A US42634A US3636967DA US3636967A US 3636967 A US3636967 A US 3636967A US 42634 A US42634 A US 42634A US 3636967D A US3636967D A US 3636967DA US 3636967 A US3636967 A US 3636967A
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Prior art keywords
jet
nozzle
pressure
control
aperture
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US42634A
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Norman Moss
Michael John Broad
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Eaton Corp
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Plessey Co Ltd
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Assigned to EATON CORPORATION reassignment EATON CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PLESSEY COMPANY PLC, THE
Assigned to EATON CORPORATION reassignment EATON CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PLESSEY OVERSEAS LIMITED
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C1/00—Circuit elements having no moving parts
    • F15C1/02—Details, e.g. special constructional devices for circuits with fluid elements, such as resistances, capacitive circuit elements; devices preventing reaction coupling in composite elements ; Switch boards; Programme devices
    • F15C1/04—Means for controlling fluid streams to fluid devices, e.g. by electric signals or other signals, no mixing taking place between the signal and the flow to be controlled
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/218—Means to regulate or vary operation of device
    • Y10T137/2202—By movable element
    • Y10T137/2207—Operating at timed intervals [e.g., to produce pulses]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/218—Means to regulate or vary operation of device
    • Y10T137/2202—By movable element
    • Y10T137/2213—Electrically-actuated element [e.g., electro-mechanical transducer]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/218—Means to regulate or vary operation of device
    • Y10T137/2202—By movable element
    • Y10T137/2218—Means [e.g., valve] in control input
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/2273—Device including linearly-aligned power stream emitter and power stream collector

Definitions

  • a pressure change suitable for the control of a fluidic switch can be achieved without the use of movable valves by the application of ultrasonic vibrations to a nozzle producing a jet of fluid directed at a coaxial collector orifice.
  • Either collector orifice may be the inlet end of a preferably sharp-edged dynamic-pressure tube, and the pressure in this tube utilized, or the collector tube may be used as a vent ofa vessel in which the jet is formed, the change in the pressure in this vessel due to the application of the oscillations, which may be a change from negative to positive relative pressure, being then utilized as a control pressure.
  • control is effected by applying to a nozzle by which a jet of operating fluid is produced and directed at an aperture aligned with the jet nozzle, ultrasonic vibrations in the longitudinal direction of the jet"
  • the dynamic pressure near the axis of the jet, and therefore pressure buildup in the aligned orifice is substantially decreased, and this decrease in dynamic pressure may be utilized as a pressure signal responsive to the application of the ultrasonic vibrations.
  • the phenomenon may be explained by assuming that the application of ultrasonic vibrations tends to transform a solid, compact jet into an expanding cone-type spray.
  • the aligned orifice or collector nozzle may be used as a vent and the variation of the pressure in a chamber enclosing the jet from the jet-producing nozzle to the outlet orifice may be used as a control pressure for fluidic apparatus.
  • the application of the ultrasonic vibrations to the jet nozzle will result in a considerable increase in the control pressure generated.
  • the application of ultrasonic vibrations can be arranged to cause the suction to be changed to an excess pressure, thus utilizing the ultrasonic vibrations to reverse the sign of a control pressure with a view, for example, to causing a piston to move towards one end of its stroke in the absence, and towards the other end of its stroke in the presence, of ultrasonic vibrations.
  • ultrasonic vibrations is utilized in this specification to indicate vibrations of a frequency high enough to result in considerable variations of the type of jet issuing from the jet nozzle.
  • the lower limit of this range has been found in many cases to substantially coincide with the audibility limit for an average human ear, being for example between and [5 kHz.
  • FIG. 11 is a diagram of part of a fluidic system including an axial section of the device
  • FIG. 2 is a fragmentary axial section illustrating a modified form of collector nozzle.
  • a gaseous fluid for example air under pressure
  • a gaseous fluid is fed by a flexible pipe l to a nozzle chamber 2 which is formed in a metal body 3 to constitute a noule passage, and which has a sharp-edged outlet nozzle d hereinafter called jet nozzle.
  • This jet nozzle opens into a vessel 8 which, like the body 3, forms part of a body structure and will, when fed with fluid from the pipe ll, produce a reasonably compactjet 5 of the fluid.
  • a collector nozzle Aligned coaxially with thejet nozzle 4 and the jet 5 is a collector nozzle consisting of a tube 6, which is connected to a flexible conduit 7 so that, so long as the flow permitted through the tube 6 is kept small in comparison to the mass flow through the jet nozzle 4, the tube 6 may be considered to constitute a dynamic-pressure nozzle, so that a pressure will be built up in the tube 6 which exceeds the static pressure in the vessel 8 in which the jet-forming nozzle 4, the jet 5, and the orifice of the collector nozzle 6 are confined, by the dynamic pressure of the jet 6 at the entrance to the tube 6.
  • the metal body 3 containing the chamber 2, and a generally similar balance body 9, are arranged at opposite sides of a piezoelectric element llt) to form an electromechanical transducer which, when electrical energy of ultrasonic frequency is applied to the piezoelectric element 10 by terminal wires ill, will produce ultrasonic longitudinal oscillations of the jet nozzle 4.
  • the conduit 7 may be connected to, for example, the control-jet inlet of a fluidic switch 16a in order to perform a fluidic switching operation.
  • the vessel 8 is formed with a lateral aperture 12 which, for this use of the apparatus, will be left open to the atmosphere.
  • a conduit 13 is connected to the lateral aperture 112 of the vessel 8, and the outlet of the tube 6 is exposed to the atmosphere.
  • the supply of air through the tube ll may be arranged to normally produce suction inside the vessel 8, which can be transmitted by the conduit 13 to a fluidic device to be controlled and shown in the drawing as a fluidic switch 11612; the application of suitable electric power to the terminals 11 and thus of ultrasonic vibrations to the nozzle 4 will then cause the pressure in the vessel 8 to rise, preferably above atmospheric pressure, thus providing a means for applying to the fluidic device 16b, through the conduit 13, a pressure which, compared with atmospheric pressure, changes from negative to positive when electric power is applied to the piezoelectric element 10 by the wires ll.
  • FIG. 2 illustrates a modified collector tube 6a which may be substituted for the collector tube 6 of FIG. 1, more particularly when the pressure developed in the collector tube is to be utilized for controlling a fluidic device.
  • This tube 6a is tapered at its inlet end by conical formation of its outside surface so as to present to the flow a knife edge. This feature has been found to emphasize the change of pressure in the collector tube achievable by the application of ultrasonic vibrations to the nozzle 4.
  • an optional feature of the illustrated apparatus consists in the provision of a baffle plate 14 which has an aperture 115 aligned with the jet 5.
  • This arrangement has been found to be capable, if the baffle plate is suitably placed and shaped, of increasing the available percentage change of dynamic pressure as measured by the tube, although this percentage increase may be accompanied by a reduction in the total dynamic pressure observed in the tube.
  • An electric control device for a fluidic-pressure output which comprises a body structure, a jet-forming nozzle in said body structure, said nozzle being adapted for connection to a fluid-pressure supply and having an outlet for producing a jet of such fluid, said body structure having a collector aperture aligned with such jet in spaced relation from the nozzle outlet and a further aperture communicating with both the nozzle outlet and the collector aperture but clear of the path of such jet, one of said apertures being adapted for connection to a control inlet of a fluidics device and the other aperture being open to the ambient atmosphere, and electromechanical transducer means adapted for connection to an electric control input and associated with the nozzle for, when energized, applying to the nozzle and the fluid passing through it ultrasonic oscillations in the longitudinal direction of the jet produced by the nozzle.
  • a control deviceas claimed in claim I in combination with a fluidic device having a control-pressure inlet connected to said one aperture.
  • a control device as claimed in claim 3 which includes a collector tube aligned with the jet nozzle and having its end facing the latter formed as a knife edge.

Abstract

A pressure change suitable for the control of a fluidic switch can be achieved without the use of movable valves by the application of ultrasonic vibrations to a nozzle producing a jet of fluid directed at a coaxial collector orifice. Either collector orifice may be the inlet end of a preferably sharpedged dynamic-pressure tube, and the pressure in this tube utilized, or the collector tube may be used as a vent of a vessel in which the jet is formed, the change in the pressure in this vessel due to the application of the oscillations, which may be a change from negative to positive relative pressure, being then utilized as a control pressure.

Description

lllnited States Patent Moss et a1,
[4 1 Jan, 25, 1972 154] CONTRUIL 0F FLUIDIC DEVICES Norman Moss, llford; Michael John Broad,
[72] Inventors: Enfield, both of England [73] Assignee: The Plessey Company Limited, llford, En-
gland [22] Filed: June 2, 1970 [21 1 Appl. No.: 42,634
[30] Foreign Application Priority Data June 24. 1969 Great Britain ..31,730/69 [52] .....137/81.5 [51] ..Fl5c 3/12 [58] ..137/81.5, 83; 346/75 [56] References Cited UNITED STATES PATENTS 3,386.343 6/1968 Gray ....137/83 X 3.500.850 3/1970 Kelley ..137/8l.5 3.334.641 8/1967 Bjornsen ..137/83 X 2,128,682 8/1938 Von Manteuffel 1 37/83 3.144.037 8/1964 Cargill et a1. 137/81 5 3.266.513 8/1966 Voit, Jr 137/815 3,281,860 10/1966 Adams et al. .....346/75 3,298,030 1/1967 Lewis et a1 .346/75 3,3 79,204 4/1968 Kelley et a1. ..137/81.S 3,406,701 10/1968 Meulendyk 1 137/83 3,454,025 7/1969 Egli 1 37/815 Primary Examiner-Samuel Scott Attorney-Blum. Moscovitz, Friedman & Kaplan 57 ABSTRACT A pressure change suitable for the control of a fluidic switch can be achieved without the use of movable valves by the application of ultrasonic vibrations to a nozzle producing a jet of fluid directed at a coaxial collector orifice. Either collector orifice may be the inlet end of a preferably sharp-edged dynamic-pressure tube, and the pressure in this tube utilized, or the collector tube may be used as a vent ofa vessel in which the jet is formed, the change in the pressure in this vessel due to the application of the oscillations, which may be a change from negative to positive relative pressure, being then utilized as a control pressure.
7 Claims, 2 Drawing Figures INPUT ELECTRIC OUTPUT 'A' PATTENIED M25 I972 INPUT ELECTRIC I2 (FLUID/C ou TPUTB' FLU/DIG SWITCH FLUID/C OUTPUT A CONTROL ()ll FLUiDlC DEVKCIES This invention relates to fluidic devices such as fluidic monostable or bistable switches and fluidic amplifiers. Such fluidic devices are generally operated by gaseous fluids, and the invention has for an object to provide electrically operable control means for such devices whichdo not involve the use of mechanical valves or other devices subject to wear. According to the present invention control is effected by applying to a nozzle by which a jet of operating fluid is produced and directed at an aperture aligned with the jet nozzle, ultrasonic vibrations in the longitudinal direction of the jet" When the jet nozzle is subjected to such ultrasonic vibrations, the dynamic pressure near the axis of the jet, and therefore pressure buildup in the aligned orifice, is substantially decreased, and this decrease in dynamic pressure may be utilized as a pressure signal responsive to the application of the ultrasonic vibrations. The phenomenon may be explained by assuming that the application of ultrasonic vibrations tends to transform a solid, compact jet into an expanding cone-type spray. This is known to occur when ultrasonic vibrations are applied to a nozzle by which a jet of liquid fuel is injected into a gaseous atmosphere, and the occurrence of a similar transformation in the case of a gaseous jet is suggested by the fact that we have also found that when a baffle having a through orifice is placed between a jet nozzle fed with air and an aligned collector nozzle with the baffle orifice in axial alignment with both nozzles, the application of ultrasonic longitudinal vibrations to the jet nozzle increases the force exerted upon the baffle in the direction of the jet while at the same time reducing the pres sure measured at the collector nozzle.
According to a modification of the invention, the aligned orifice or collector nozzle may be used as a vent and the variation of the pressure in a chamber enclosing the jet from the jet-producing nozzle to the outlet orifice may be used as a control pressure for fluidic apparatus. In this case the application of the ultrasonic vibrations to the jet nozzle will result in a considerable increase in the control pressure generated. If the chamber is so constructed that in the absence of ultrasonic vibrations a suction effect is produced in the chamber, the application of ultrasonic vibrations can be arranged to cause the suction to be changed to an excess pressure, thus utilizing the ultrasonic vibrations to reverse the sign of a control pressure with a view, for example, to causing a piston to move towards one end of its stroke in the absence, and towards the other end of its stroke in the presence, of ultrasonic vibrations.
The term ultrasonic vibrations is utilized in this specification to indicate vibrations of a frequency high enough to result in considerable variations of the type of jet issuing from the jet nozzle. The lower limit of this range has been found in many cases to substantially coincide with the audibility limit for an average human ear, being for example between and [5 kHz.
Two alternative embodiments of a control-pressure generating device according to the present invention as applied to a fluidic element will now be described in more detail by way of example with reference to the accompanying drawing, in which FIG. 11 is a diagram of part of a fluidic system including an axial section of the device, while FIG. 2 is a fragmentary axial section illustrating a modified form of collector nozzle.
Referring now first to FIG. l, a gaseous fluid, for example air under pressure, is fed by a flexible pipe l to a nozzle chamber 2 which is formed in a metal body 3 to constitute a noule passage, and which has a sharp-edged outlet nozzle d hereinafter called jet nozzle. This jet nozzle opens into a vessel 8 which, like the body 3, forms part of a body structure and will, when fed with fluid from the pipe ll, produce a reasonably compactjet 5 of the fluid. Aligned coaxially with thejet nozzle 4 and the jet 5 is a collector nozzle consisting of a tube 6, which is connected to a flexible conduit 7 so that, so long as the flow permitted through the tube 6 is kept small in comparison to the mass flow through the jet nozzle 4, the tube 6 may be considered to constitute a dynamic-pressure nozzle, so that a pressure will be built up in the tube 6 which exceeds the static pressure in the vessel 8 in which the jet-forming nozzle 4, the jet 5, and the orifice of the collector nozzle 6 are confined, by the dynamic pressure of the jet 6 at the entrance to the tube 6. The metal body 3 containing the chamber 2, and a generally similar balance body 9, are arranged at opposite sides of a piezoelectric element llt) to form an electromechanical transducer which, when electrical energy of ultrasonic frequency is applied to the piezoelectric element 10 by terminal wires ill, will produce ultrasonic longitudinal oscillations of the jet nozzle 4. We have found that, when ultrasonic vibrations are thus applied to the nozzle 4, the pressure built up in tube 6 and conduit 7 will fall considerably as compared to the pressure produced by the jet in the absence of such ultrasonic vibrations, and accordingly the conduit 7 may be connected to, for example, the control-jet inlet of a fluidic switch 16a in order to perform a fluidic switching operation. The vessel 8 is formed with a lateral aperture 12 which, for this use of the apparatus, will be left open to the atmosphere.
In an alternative mode of use a conduit 13 is connected to the lateral aperture 112 of the vessel 8, and the outlet of the tube 6 is exposed to the atmosphere. In this case, provided the tube 6 and the nozzle 4 are suitably arranged and dimensioned, the supply of air through the tube ll may be arranged to normally produce suction inside the vessel 8, which can be transmitted by the conduit 13 to a fluidic device to be controlled and shown in the drawing as a fluidic switch 11612; the application of suitable electric power to the terminals 11 and thus of ultrasonic vibrations to the nozzle 4 will then cause the pressure in the vessel 8 to rise, preferably above atmospheric pressure, thus providing a means for applying to the fluidic device 16b, through the conduit 13, a pressure which, compared with atmospheric pressure, changes from negative to positive when electric power is applied to the piezoelectric element 10 by the wires ll.
FIG. 2 illustrates a modified collector tube 6a which may be substituted for the collector tube 6 of FIG. 1, more particularly when the pressure developed in the collector tube is to be utilized for controlling a fluidic device. This tube 6a is tapered at its inlet end by conical formation of its outside surface so as to present to the flow a knife edge. This feature has been found to emphasize the change of pressure in the collector tube achievable by the application of ultrasonic vibrations to the nozzle 4.
Referring now once more to FIG. 1, an optional feature of the illustrated apparatus consists in the provision of a baffle plate 14 which has an aperture 115 aligned with the jet 5. This arrangement has been found to be capable, if the baffle plate is suitably placed and shaped, of increasing the available percentage change of dynamic pressure as measured by the tube, although this percentage increase may be accompanied by a reduction in the total dynamic pressure observed in the tube.
It may be added that in preliminary experiments employing a jet nozzle and a collector tube of about 0.5 mm. inside diameter each, the application of a 20 w. electrical input at 50 kHz. to a piezoelectric oscillator for the jet nozzle could be made to result in a substantially proportional 45 percent reduction in the recoverable pressure head over an air speed range of between 0 and 20 cm. H O in the collector tube 6, while the replacement of the tube 6 by a sharp-edged tube 6a resulted in a reduction in the recoverable pressure head during the application of the oscillations which in some cases was as high as 50 to 55 percent.
We claim:
1. An electric control device for a fluidic-pressure output, which comprises a body structure, a jet-forming nozzle in said body structure, said nozzle being adapted for connection to a fluid-pressure supply and having an outlet for producing a jet of such fluid, said body structure having a collector aperture aligned with such jet in spaced relation from the nozzle outlet and a further aperture communicating with both the nozzle outlet and the collector aperture but clear of the path of such jet, one of said apertures being adapted for connection to a control inlet of a fluidics device and the other aperture being open to the ambient atmosphere, and electromechanical transducer means adapted for connection to an electric control input and associated with the nozzle for, when energized, applying to the nozzle and the fluid passing through it ultrasonic oscillations in the longitudinal direction of the jet produced by the nozzle.
2. A control deviceas claimed in claim I, in combination with a fluidic device having a control-pressure inlet connected to said one aperture.
3. A control device as claimed in claim 1, wherein the collector aperture is adapted for connection to such control inlet.
4. A control device as claimed in claim 3, which includes a collector tube aligned with the jet nozzle and having its end facing the latter formed as a knife edge.
5. A control device as claimed in claim 1, wherein the further aperture is adapted for connection to such control inlet.
6. A control device as claimed in claim 5, which includes a baffle plate fixedly connected to the body structure, said plate extending across the jet and having an aperture aligned with the jet.
7. A control device as claimed in claim 6, in combination with a fluidic device having a control-pressure inlet connected to said one aperture.

Claims (7)

1. An electric control device for a fluidic-pressure output, which comprises a body structure, a jet-forming nozzle in said body structure, said nozzle being adapted for connection to a fluid-pressure supply and having an outlet for producing a jet of such fluid, said body structure having a collector aperture aligned with such jet in spaced relation from the nozzle outlet and a further aperture communicating with both the nozzle outlet and the collector aperture but clear of the path of such jet, one of said apertures being adapted for connection to a control inlet of a fluidics device and the other aperture being open to the ambient atmosphere, and electromechanical transducer means adapted for connection to an electric control input and associated with the nozzle for, when energized, applying to the nozzle and the fluid passing through it ultrasonic oscillations in the longitudinal direction of the jet produced by the nozzle.
2. A control device as claimed in claim 1, in combination with a fluidic device having a control-pressure inlet connected to said one aperture.
3. A control device as claimed in claim 1, wherein the collector aperture is adapted for connection to such control inlet.
4. A control device as claimed in claim 3, which includes a collector tube aligned with the jet nozzle and having its end facing the latter formed as a knife edge.
5. A control device as claimed in claim 1, wherein the further aperture is adapted for connection to such control inlet.
6. A control device as claimed in claim 5, which includes a baffle plate fixedly connected to the body structure, said plate extending across the jet and having an aperture aligned with the jet.
7. A control device as claimed in claim 6, in combination with a fluidic device having a control-pressure inlet connected to said one aperture.
US42634A 1969-06-24 1970-06-02 Control of fluidic devices Expired - Lifetime US3636967A (en)

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DE (1) DE2030943A1 (en)
FR (1) FR2047900B1 (en)
GB (1) GB1309082A (en)
NL (1) NL7008568A (en)
SE (1) SE359356B (en)

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GB2170324B (en) * 1985-01-16 1988-09-14 British Nuclear Fuels Plc Pumping systems and control means therefor
GB9008153D0 (en) * 1990-04-10 1990-06-06 Norgren Martonair Ltd Pneumatic actuator

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2128682A (en) * 1936-06-15 1938-08-30 Askania Werke Ag Control device
US3144037A (en) * 1961-02-16 1964-08-11 Sperry Rand Corp Electro-sonic fluid amplifier
US3266513A (en) * 1964-03-02 1966-08-16 Ibm Switching arrangements for fluid amplifiers
US3281860A (en) * 1964-11-09 1966-10-25 Dick Co Ab Ink jet nozzle
US3298030A (en) * 1965-07-12 1967-01-10 Clevite Corp Electrically operated character printer
US3334641A (en) * 1964-06-26 1967-08-08 Johnson Service Co Fluid stream control apparatus
US3379204A (en) * 1965-05-19 1968-04-23 Gen Electric Fluid signal resonator controls
US3386343A (en) * 1965-08-20 1968-06-04 Bell Aerospace Corp Dynamically constantly variable gain servocontrol system
US3406701A (en) * 1966-09-13 1968-10-22 Pneumo Dynamics Corp Two-stage fluid control valve
US3454025A (en) * 1966-10-19 1969-07-08 Honeywell Inc Control apparatus
US3500850A (en) * 1967-09-15 1970-03-17 Usa Fluid signal vibrating reed apparatus

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2128682A (en) * 1936-06-15 1938-08-30 Askania Werke Ag Control device
US3144037A (en) * 1961-02-16 1964-08-11 Sperry Rand Corp Electro-sonic fluid amplifier
US3266513A (en) * 1964-03-02 1966-08-16 Ibm Switching arrangements for fluid amplifiers
US3334641A (en) * 1964-06-26 1967-08-08 Johnson Service Co Fluid stream control apparatus
US3281860A (en) * 1964-11-09 1966-10-25 Dick Co Ab Ink jet nozzle
US3379204A (en) * 1965-05-19 1968-04-23 Gen Electric Fluid signal resonator controls
US3298030A (en) * 1965-07-12 1967-01-10 Clevite Corp Electrically operated character printer
US3386343A (en) * 1965-08-20 1968-06-04 Bell Aerospace Corp Dynamically constantly variable gain servocontrol system
US3406701A (en) * 1966-09-13 1968-10-22 Pneumo Dynamics Corp Two-stage fluid control valve
US3454025A (en) * 1966-10-19 1969-07-08 Honeywell Inc Control apparatus
US3500850A (en) * 1967-09-15 1970-03-17 Usa Fluid signal vibrating reed apparatus

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NL7008568A (en) 1970-12-29
FR2047900B1 (en) 1975-10-10
JPS519866B1 (en) 1976-03-31
FR2047900A1 (en) 1971-03-19
GB1309082A (en) 1973-03-07
SE359356B (en) 1973-08-27
DE2030943A1 (en) 1971-01-07

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