Патент USA US2407018код для вставки
Sept-3,1946. ‘ ‘ , D. MécKENZIE _ _ 2,407,018 FLUID-ACTUATEDICON'I‘ROL’SYSTEM ' Filed Jung so, 1941 PUMP!’ JULE/UO/D OPERATED kaszerola C) meo'rn: omit/l17 ‘ _ :Inve?iorn ‘Donald MacKenzie' 'ba/d ‘ I ' Patented Sept. 3, 1946 2,407,018 UNITED sTATEs‘ PATENT OFFICE 2,407,018 ‘FLUID-ACTUATED CONTROL SYSTEM Donald‘MacKenzie, Cheltenham, England, assign ‘or to Dowty Equipment Limited, Cheltenham, England Application June 30, 1941, Serial No. 400,539 In Great Britain October 15, 1940 9 Claims. (01. 177-5311)’ 1 . part of the actual ?uid system need come into The present invention relates to remote control ‘ systems. the control station. The electrical connection be . Though primarily intended for use in hydraulic control systems for aircraft as employ double acting hydraulic jacks for such operations as raising and/or lewering alighting gear, ?ap con trol, controlling airscrew pitch, operation of gun tween the control station and the valve or equiv alent member to be actuated may involve readily detachable plug ‘connections to facilitate removal and servicing, and where the system is compli cated, provision may be made to prevent inad turrets, bomb-racks, retractable‘ radiators, et cet vertent or incorrect connection on reassembly. era, it is conceivable that the invention may also have useful application to any control system in Provisions to these ends being well-known, their which a valve or equivalent actuating member In order that it may be clearly understood and illustration has been omitted. V readily carried into effect, the invention is here associated with a device to be actuated needs to inafter described with reference to the accom be controlled from some remote point. panying diagrammatic drawing, which illustrates It is an object of the present invention to pro vide an improved ?uid actuated remotely con 15 a ?uid pressure remote control system according to the invention operable by electrical means for trolled system in which the jacks are controlled effecting retraction and extension of undercar for operation electrically in both senses by‘means riage jacks. ‘ of press-button switches. Electrical control of Referring now to the drawing, the engine the jacks has the advantage that in many cases, particularly in aircraft structures, the lay-out 20 driven pump I draws actuating ?uid from the reservoir 2 along the conduit 3, preferably in cluding the _?lter 4. 'From the outlet of the pump the conduit 5 feeds through the non-return the circuit, pipe lines, etc., can be localized in of the system can be very considerably simpli?ed owing to the fact that the hydraulic elements of valve 6 to the electrically-controlled valve 1. The the structure and wires run off to one or more remote control stations thereby making it unnec 25 valve 1 is preferably of the kind described in my ‘co-pending United States application Serial No. 398,674, ?led June 18, 1941 (see Figure 2 thereof), and is controlled electrically by the solenoid 8, but any convenient form of electrical control essary to run the ?uid conduits of the system back to control valves accessible to the pilot. It is a further object of the invention to pro vide a satisfactory light-weight fluid pressure re mote control circuit in which the fluid conduits 30 valve can be used which can be operated selec tively to establish the required communication to and the associated ?uid circuit is kept as simple the conduits 9 and I0, ?ow through which oper as possible and in which the means for actuating ates the jacks H for extension and retraction, the system electrically can serve also as means it for indicating the positions of the controlled ele ments (1. e., whether, for instance, an under respectively. trolling its movement in retraction and exten sion. When pressure flow is through either con; duit 9 or H], as the case may be, return ?ow is carriage is fully retracted or fully locked down and thereby set for landing). In preferred con structions, signal lights are provided in or as sociated with press-buttons for actuating the circuit. ‘ In some cases the valve or equivalent means by Which the receivers are actuated ‘may be car ried directly by the receivers so that each con trolled unit may be regarded virtually as an in The jacks in this case are oper 35 atively connected with the undercarriage for con 40 back through the other, through the‘body of the valve 1, and along the return conduit [2, In the arrangement shown the solenoid has two limit positions one of which it assumes under spring-loading when de-energised to place the‘ conduit 9 in ‘communication with the pressure stallation complete in itself ready for connection 45 conduit 5 from the pump l for extension of the jacks I], When energised the solenoid moves to to the circuit. ’ ~ g its other‘extreme position to establish communi It will be evident that placing the control valves cation between the conduit 5 and the line ‘l0 for at convenient remote points in the system may retraction of the jacks. result in considerable simpli?cation on account The solenoid 8 is energisable and de-energis of the fact that it then becomes no longer nec 50 able by means of press-buttons l3 and I4 cou essary to bring numerous flow and return lines ~' pled together to ensure that oneis out when the to a series of valves at the control station; all other is in. Pressure on the button [3 connects that is required is electrical connection between the solenoid to the battery It through the leads the control station (the pilot’s cockpit in the case of aircraft), and each, valve, ‘in which caseno 55 I8‘ and I1 for energisation, and pressure upon 2,407,018 3 the other button l4 breaks the circuit and leaves the solenoid de-energised. A preferred arrangement of the press-buttons l3 and E4 in the circuit is illustrated, which en ables the press-buttons to serve as indicator means to show the pilot when the undercarriage is properly set for landing. Accordingly, the plunger-actuated up switches 18 and down 4 trol simultaneous movement of both jacks, termi nal position indicator means, means operable only by movement of both jacks into a terminal posi tion to energize said terminal position indicator means, intermediate position indicator means, means operable during such time as either jack is in a position intermediate its fully extended position and its fully retracted position to oper switches l9 are operated respectively when the ate said intermediate position indicator means, undercarriage is locked in the fully-up and fully 10 and means operable by movement of both jacks down positions, the plungers of the switches being into terminal positions to deenergize said inter engaged by the switch-actuating arms 20. The mediate position indicator means. plungers of the switches l8 and I9 are spring 2. Control means for a pressure system incor urged so as normally to project, but are pressed porating two cooperating double-acting hydraulic in by the switch-actuating arms 29. The press 15 jacks, and a source of ?uid under pressure, com buttons I3 and 54 include indicator lights l3a prising means operable to control ?ow of ?uid and Ma appropriately illuminated according to under pressure to move both jacks, terminal posi the operation involved. The press-buttons are tion indicator means, means operable only by therefore formed hollow, having translucent end movement of both jacks to the same terminal po panels [31) and Mb, respectively, of which the 20 sition to energize said terminal position indicator panel l3b is red and Mb green. The press-but means, intermediate position indicator means, tons l3 and I4 slide in tubular guides 2| and 22, means operable prior to both jacks reaching the respectively, and are connected by the link 23, same terminal position to operate said interme swinging about the ?xed pivot 24. diate position indicator means, and means oper Let it be assumed that the indications required 25 able by movement of both jacks into correspond to be given are essentially a green light signal ing terminal positions to deenergize said inter through the press-button l4 when the undercar mediate position indicator means. riage is locked in the down position and (when 3. Control means for a pressure system incor extension operation has been initiated) a red light porating two cooperating double-acting jacks signal persisting until the undercarriage reaches 30 and a source of ?uid under pressure, comprising that condition. If now the undercarriage jacks H are retracted with the aircraft in ?ight, the arrangement is as drawn with the press-button I3 in. The solenoid 8 is energised and no lights are visible, for the circuit through l3a is open at I8. To lower the undercarriage, the press-button I4 is pressed in, with the result that the solenoid 8 is de-energised and pressure ?uid flows through the valve 1, along the conduit 9 to extend the jacks ll. Immediately the up switches 18 are released and closed as the actuating arms 20 free the up switch plungers, and a red light appears inside the now-projected press-button Hi. When the undercarriage jacks reach the fully-extended condition, the undercarriage is locked in the ex tended position and the double-throw down means operable in one direction to control simul taneous ?ow of ?uid under pressure to extend both jacks, and operable in the opposite direction to control the ?ow of ?uid from said ?uid supply source to retract both jacks, jack-extended in dicator means, means operable only by move ment of both jacks into fully extended position to energize said jack-extended indicator means, intermediate position indicator means, means operable during such time as either jack is in other than its fully extended position, whether in its fully retracted position or intermediate its fully extended position and its fully retracted position, to operate said intermediate position indicator means, means operable by movement of both jacks into their fully extended positions to deenergize said intermediate position indicator switches i9 are reversed in position by the arms 20, so that the red light I3a is extinguished, and means, and means operable by movement of both the green light Ma is illuminated inside the press jacks into their fully retracted positions to de button It. The throttle switch 25 is actuated 50 energize said intermediate position indicator by the throttle lever and operates to sound a means. buzzer 26 if the throttle is more than two-thirds 4. Control means for an operating system in corporating two cooperating jacks and jack op-, closed when the undercarriage is not locked in the extended position ready for landing. The switch erating means, comprising means operable to 21 is merely an “on-and-oif” switch so that the control simultaneous movement of both jacks, in indicator lights can be turned off when the in termediate position indicator means, means oper dicator is not required. able during such time as either jack is in a po To retract the undercarriage from the extended sition intermediate its fully extended position and its fully retracted position to operate said inter condition, the press-button I3 is pushed in (there by projecting the press-button M), with the re 60 mediate position indicator means, and means op erable by movement of both jacks into terminal sult that the solenoid 8 is energised and oil passes positions to deenergize said intermediate position through the control valve 1 and through the con indicator means. duit ID to retract the jacks ll; return oil ?owing 5. Control means for an operating system in from the jacks, along the conduit 9, back to the reservoir via conduit l2. Immediately the down 65 corporating two or more cooperating- jacks, and jack-operating means, comprising means oper switches I!) are released and reversed, the green able to effect substantially simultaneous move light is extinguished and a red light appears at ment in the same sense of both jacks, an inter the button l3, but when both jacks II are fully mediate-position indicator, an extended-position retracted, the undercarriage is locked in the re tracted position and the switches l8 open to ex 70 indicator, and a control system for said indi cators including a ?rst control arranged for op tinguish the red light. eration by each jack upon departure from re What I claim is: 1. Control means for an operating system in tracted position to energize the intermediate corporating two cooperating jacks and jack op~ position indicator, a second two-position control erating means, comprising means operable to con 75 arranged for operation by each jack upon arrival 2,407,618 least one of said second controls being interposed between the ?rst controls and the intermediate position indicator, and in the normal position corresponding to departure from fully extended position operatively connecting said ?rst con trols to their indicator, said second controls, in extended position, to thereby deenergize said extended-position indicator. 8. Position indicating means for an operating system which incorporates two or more cooperat ing jacks or like prime movers, and means to ef fect substantially simultaneous movement of all their positions corresponding to fully extended ' position, being connected in series to prevent de energization of the intermediate-position indi cator prior to arrival of all jacks in fully ex tended position. 6 extended-position indicator, and further respon-y _ sive to reenergization of the intermediate-posi tion indicator upon departure of any‘jack from at or departure from fully extended position, at 10 jacks between an extended and a retracted posi- tion; said position-indicating means comprising a ?rst indicator which indicates arrival of the jacks in the extended position, and a second in 6. Position indicating means for an operating dicator which indicates disposition of any jack, system which incorporates two or more cooperat ing jacks or like prime movers,‘ and means to ef 15 or all, in any position intermediate the extended and retracted positions; means responsive to de fect substantially simultaneous movement of all parture of any jack, or all, fromretracted posi jacks between an operative and an inoperative tion to energize said second or intermediate-po sition indicator, and further responsive to return rival of the jacks in the operative terminal po 20 of all jacks to retracted position to deenergize said intermediate-position indicator; means re sition, and a second indicator which indicates sponsive to arrival of all jacks at the extended disposition of any jack, or all, in any position position to deenergize said intermediate-position intermediate the two terminal positions; means indicator, and to energize said ?rst or extended responsive to departure of any jack, or all,,from position indicator. inoperative terminal position to energize said sec terminal position; said position-indicating means comprising a ?rst indicator which indicates ar responsive to arrival of all jacks at the operative terminal position to ,deenergize said intermedi 9. Position indicating means for an operating system which incorporates two or more cooperat ing jacks or like prime movers, and means to ef ate-position indicator; and further means re fect substantially simultaneous movement of all , ond or intermediate-position indicator; means sponsive to arrival of all‘ jacks at the operative 30 jacks between an extended and a retracted posi tion; said position-indicating means comprising terminal position to energize said ?rst or opera tive-position indicator. . - 7. Position-‘indicating means for an operating system which incorporates two or more cooperat ing jacks or like prime movers, and means to ef a ?rst indicator which indicates arrival of the jacks in the extended position, and a second in dicator which indicates disposition of any jack, 35 or all, in any position intermediate the extended end retracted positions; means responsive to de parture of any jack, or all, from retracted po sition to energize said second or intermediate tion; said position-indicating means comprising position indicator, and further responsive to a ?rst indicator which indicates arrival of the jacks in the extended position, and a second in 40 return of all jacks to retracted position to deener gize said intermediate-position indicator; means dicator which indicates disposition of any jack, responsive to arrival of all jacks at the extended or all, in any position intermediate the extended _ position to deenergize said intermediate-position and retracted positions; ‘means responsive to de ' indicatonand to energize said ?rst or extended parture of any jack, or all, from retracted posi fect substantially simultaneous movement of all jacks between an extended and a retracted posi tion to energize said second or intermediate-posi 45 position indicator, said latter means including a line common’to the two indicators, and alter tion indicator; means responsive to arrival of all jacks at the extended position to deenergize said natively operable switch means therein, to enable intermediate-position indicator, and responsive, energization of one or the other indicator, accord to departure therefrom of ‘any jack to reener ing to the disposition of the jacks in or out of extended position, but never both such indicators. gize said intermediate-position indicator; and further means responsive to arrival of all jacks at the extended position to energize said ?rst or DONALD MACKENZIE.