GB994675A - Digital servo actuators - Google Patents

Digital servo actuators

Info

Publication number
GB994675A
GB994675A GB4337862A GB4337862A GB994675A GB 994675 A GB994675 A GB 994675A GB 4337862 A GB4337862 A GB 4337862A GB 4337862 A GB4337862 A GB 4337862A GB 994675 A GB994675 A GB 994675A
Authority
GB
United Kingdom
Prior art keywords
output member
piston
valve
lever
positioning means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4337862A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cadillac Gage Co
Original Assignee
Cadillac Gage Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cadillac Gage Co filed Critical Cadillac Gage Co
Publication of GB994675A publication Critical patent/GB994675A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/12—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action
    • F15B11/121—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions
    • F15B11/126—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions by means of actuators of the standard type with special circuit controlling means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
    • F15B9/12—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor in which both the controlling element and the servomotor control the same member influencing a fluid passage and are connected to that member by means of a differential gearing

Abstract

994, 675. Fluid-pressure servomotor systems. CADILLAC GAGE CO. Nov.16, 1962 [Nov.17, 1961], No. 43378/62. Heading G3P. [Also in Division G4] A servo actuator comprises linear positioning means 10 having an output member 20 the position of which is discretely variable in response to control signals applied to the means 10 and which controls a valve 12, valve 12 controlling booster means 14 having a positionable output member 24, and positional feedback means 190 from the booster 14 to valve 12 whereby the output member 24 is moved to a position depending on the position of the output member 20. The linear positioning means 10 has a cylinder containing an end cap 30, pistons 32, 34.50 and output member 20 which is fixed to piston 50. Cap 30 and piston 32.. 50 have hooked extensions such that the distance between any given two adjacent elements 30, 32. . 50 in the cylinder can vary over a fixed range, the ranges being in the ratio 1:1: 2: 2 : 4 : 4. 16: 16 going along the chain of elements 30, 32.. 50. Each chamber between adjacent elements is held in an expanded or contracted condition, i.e. with the two elements as far apart or as close as possible, by solenoid-actuated valves 18 which connect each chamber to a pressure fluid source or return. When connected to a return, the chamber contracts under the influence of a biasing pressure acting on the end piston 50 and supplied via an adjustable orifice 88. The valves 18 are arranged so that in the absence of energizing currents, alternate chambers (ratio 1: 2 : 4.. 16) are contract and the others expanded, so that the output member 20 occupies a neutral position. By energization of selected solenoids, the output member 20 can be moved in either direction from the neutral position by the required amount. The output member 20 is connected to one end of a lever 204 pivoted at 210 to the housing, the other end of lever 204 being pivoted to the mid-point of a lever 224. One end of lever 224 is connected to the control rod 22 of valve 12 and the other end to feedback means 190. The booster means 14 has a double-acting piston 182 (Fig. 4) on a piston rod 180 connected to both output member 24 and feedback means 190. The side of the piston 182 is connected to a pressure fluid source and the other to a return depending on the position of the control rod 22 of valve 12, except when rod 22 is in a mid-position when neither is connected to either. Modifications. The positioning means 10 need not operate around a neutral position, the extension ranges of successive chambers being in the ratio 1: 2 4... The combined actions of several positioning means 10, optionally modified by a manual input, could be used to control value 12.
GB4337862A 1961-11-17 1962-11-16 Digital servo actuators Expired GB994675A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15307661A 1961-11-17 1961-11-17

Publications (1)

Publication Number Publication Date
GB994675A true GB994675A (en) 1965-06-10

Family

ID=22545675

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4337862A Expired GB994675A (en) 1961-11-17 1962-11-16 Digital servo actuators

Country Status (1)

Country Link
GB (1) GB994675A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2156105A (en) * 1984-03-21 1985-10-02 Exxon Production Research Co Coded fluid control system
WO2004066043A2 (en) * 2003-01-20 2004-08-05 Rewa Spolka Z O. O. Control unit for a pneumatic actuator operating a roof smoke extractor flap

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2156105A (en) * 1984-03-21 1985-10-02 Exxon Production Research Co Coded fluid control system
WO2004066043A2 (en) * 2003-01-20 2004-08-05 Rewa Spolka Z O. O. Control unit for a pneumatic actuator operating a roof smoke extractor flap
WO2004066043A3 (en) * 2003-01-20 2004-10-14 Rewa Spolka Z O O Control unit for a pneumatic actuator operating a roof smoke extractor flap

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