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ts re ice 2,935,051 FLUED GE’ERATED RECIPROCATING MOTORS John L. Fuller and Robert L. Dangler, Shaker vHeights, Ohio, assignors to 'Curtiss-Wright ‘Corporation, a cor“ poration of Delaware Application May 28, 1958, SerialNo. 738,503 10Claims. (Cl.121-157) 10 parkedposition. ,Typicalmotor and control system ln’Fig. l-a suitable manually operated master control or metering valve unit [1, lower left, receives v('e.g.‘) air craft system supply ‘fluid throg conduit 2 and, by ma nipulation of valve stem 3,‘the valve ?rst admits ?uid into motor and control system therefor, particularly for caus ingabnormalstrokeoperationofthemotorpistonorits equivalent beyond the usual range of to and fro opera matic actuator valve mechanism or unit generally ‘indi catedat6. Suchinitialadmissionof?uid,viaconduit 4, serves a special purpose fully explained and claimed in the Moulton et al. application, but which is not perti tion, as for parking of a windshield wiper blade or the like,operatedbysuch‘motorpiston,beyondtheusually20 nenttothepresentsubjectinvention. tion. In the present mechanism, as shown herewith in .two and ‘14' ‘(left Fig. 1_) leading respectively to the left hand pressure chamber C of the motor 'M and to ‘a chamber 17" of the cylinder of a direction control or reversing piston 17 in the base of unit 6, through relative position 2,935,051 Patented May 3, 1960 ~2 I '‘including the presentparking control means in one ‘form Ishown.inrelativelyenlargedaxialcentralsection. “Fig.2 is a full scale, partly ‘cross sectional view of a motor assembly ‘incorporating a modi?ed form of the present invention. 3Fig.3'isarelativelyenlargedcentralsectional fragmentary view further showing the modi?ed form of parking control means, and ‘with the motor piston in This invention relates to a reciprocating?uid operated 15 a conduit 4 leading to the base portion 5 of the auto wipedareainadesireddirection. Thepresentimproved mechanism is adapted for use in or with motor control systems and apparatus such as shown by United States Patent 2,547,175, April 3, 1951, C. R. Sacchini, and in application Serial No. 648,007, ?led ,March 25, 1957, 25 through and past the aperture 8' of plug 8 to the duct 10 entitled Hydraulic Actuator Systems for Reciprocating Fluid Operated Motors, L. J. Moulton et al., which ‘patent and application are owned by the assignee hereof. The environment of the present inventionas shown herewith issubstantiallyaccordingtotheMoultonetal.applica 30 motoroperating.?uidisblockedfromenteringducts14 di?erent forms, hydraulic ?uid is admitted through a wiper speed'control or metering valve to anautomatically actingtoggletypereversingvalvemechanismhavingout 35 ingof?uidpathreversingvalveplugs18and19ofmecha ‘vput lines or conduits connected to the relatively opposite. nism 12,; and meanwhile fluid is admitted from the branch .ends ofthe wiper motor cylinder or plurality of cylinders portion 10"‘of the feed line into duct portions 16 and 1,6’ asdesiredand.thedirectiontofmotorpistonstroke:is> formovementofmotorpistonPleftwardly.Duct16 reversed as a;function of rise in vpressure in .the working leads tochamber C’ in‘the right hand end of motor‘M, .tcvhamberstofthemotorormotorsactinguponadirection 40 andduct16'leadstorighthandjpressurechamber‘17' controlpistonportionoforassociatedwith.thereversing valve,mechanism. Forarrestofthemotorpistonor pistons'beyondnormaltstroketerminalpositionsavari able length ?uid pressure operated device >in.each .motor ‘normally limits thestrokeof the pistonin one direction, 45 .andmeans operatedasafunctionofdecrease=in,the,rate ‘of ?uid supplied to the motor by its :metering or speed .control'valve mechanism operates to-decreasethe effective length ofthe device whereby to permit .lengtheningof the motorpistonstrokeinthe.desiredidirection. Two'forms of thepresent mechanism are.shown in.whichthe variable lengthparkingcontroldeviceissupportedinonecaseby; ton.eta1.application,.Serial,No.648,007. fa?xedpartofthemotorcylinderandin.anothercaseby ‘ ReferringtotheupperpartofFig.l,themotorpiston‘ themotorpiston.Theoperationisgenerallysimilar.in Pslidableinthebore.22ofmotorbody.orcylinder23 55 is.mademoreorlesssimilaratitsoppositeendsorheads 24 (one shown), and.the.heads arerigidlyconnected together ,by a toothed rack 125 which, through a suitable pinion and motor output shaft, notshown, reciprocates awiperorotherworkelement. ThepistonPnormally movescyclically between limits L, and, for parking of the .wiper in ‘an .area beyond that usually "wiped‘ .or.as outlined above, .thepiston moves further, as to ,limit L’ in the desired direction as will be explained. Variousobjectsandnovelfeatures‘ofthepresentinven ttionvnot indicated above will becomeiapparent from the 65 der bore 22.and chamber C in cooperation with a vcup bothcases. Animportantproblemintheconstructionof‘thevari able length parking device is to mate its action or opera~ .tion with the spring and other loading of the reversing valve’mechanismandthetoperationofthemastercontrol valve, so that the parking operation will :occur only at desired motor operating-speeds or under such conditions that no damage will‘be done to ancillary parts such as the wiper or wiper blades or the windshield framework. following description of the preferred forms shown ‘here ‘with. Theessentialcharacteristicsaresummarizedinthe claims. , shaped ?tting 28 suitably shouldered as at 29.1againstthe cylinderbody23. Theendcap.26and?tting28,are shownrasthavingmoreorlessconventionalsealassemblies. A ‘dead-endbore32is.the?tting.28serves.as.acylinder Intheaccompanying‘drawings,‘Fig.,1is,aprincipally diagrammatichydraulicfluid‘controlcircuitincluding,a70 foraparkingplunger30slidablyoccupyingthebore?l; metering valve and portions of one wiper motor .approxi and while the left ‘hand ‘piston head ‘24 ,is approaching mately:asshowninthe,Moultonet a1.applicationbut theplunger39,orasillustrated,atubularrightward-e); Furtheropeningoperationofthemastercontrolvalve 1 (raising of stem 3) permits upward movement ‘of a tubular plug 8 until it encounters a stop 9 in the main valve body, whereupon metering of ?uid takes place and its branches 10’ and 10” leading toa spring loaded toggle action reversing valve mechanism generally indi cated at 12. In the illustrated condition or temporary relationshipofpartsofthereversingvalve‘mechanism12, ofreversingpiston17. Thelefthandpressurechamber CofmotorM and‘thepressurechamber'17”areshown asbeingventedtosump atSpastanoperatingrod12' of toggle mechanism 12. The'toggle mechanism ~12 is .reversedor moved past ,deadcenterasfromtheillustratedpositiontotheopposite position‘(notshown) andviceversaasa‘functionoffull permittedstrokemovementofreversingpiston,17through operation,ofaninterconnecting‘drivedeviceindicatedby broken‘,line12a. .Portionsof'themechanism.6:notde .scribedabove are fully shown'and described intheMoul A threadedend.,cap26closestheleftendofthecylinPDF Image | FULLER FLUID OPERATED RECIPROCATING MOTORS
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