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3 tension 33 of the plunger is yieldably maintained in a position projecting from the right hand end of the ?tting 28,‘ or as limited by a suitable stop 34, under the in?uence of the compression spring 35 on a ?ange portion 36 of 4 parking position, the piston can, of course, be mechani cally locked by suitable means, for example that de scrib in the co-pending application of L. J. Moulton et al. Serial No. 738,504, ?led May 28, 1958, entitled “Park 2,935,051 a‘sleeve37betweenthespringandjashoulder38de?ning' ingmechanismsfor?uidoperatedreciprocatingmotors.” part of a counterbore in the parking plunger 30. A re duced diameter bore 40 in the plunger 30 is formed at oneendwithavalveseat41aroundarelativelylargeaxial opening42intheplunger. Avalveplugassembly44con taining an ori?ce plate 45 (ori?ce indicated 45') and including an elastic annular mounting ring 46 for the ori?ce plate is normally held in sealing relation to the seat 41 as by a light spring 48 bearing at one end against the ori?ce plate 45 and at its opposite end against the closed end or bottom wall 28' of the ?tting 28. Motor operation In the above described embodiment of the invention, some leakage will of course occur at times at all slidably ?ttedsurfacesofthevariouscomponents. Thecritical pointofleakageforenablingtheparkingplunger3%}to function properly is at and through the ori?ce 45.’ To recommence normal or limited stroke, relatively high speed operation of the motor without delay or with out re-wiping in the parking area, the control valve Itis further opened to meter ?uid into the motor chamber C’ 15 andreversingpistonchamber17'atthenecessaryhigh rate, hence effective higher pressure; the toggle mech anism operates to admit working pressure into the left ward chamber C of the motor (exhausting from chamber C’);and,astheworkingpressurerisestothepointnee“ Assuming that the generally closed chamber or pocket D insidetheplunger30and?tting28hasbeen?lled with ?uid and that the seal assembly 44 is tight against 20 sary to commence rightward stroke of the piston P, the the seat 41, itwill be apparent that when the head 24 of valve and ori?ce plate assembly 44 moves quickly away motorpistonP encounterstheprojectingendportion33 fromtheseat41againsttheresistanceofthelightspring oftheplunger30,thepocketed?uidwill,ineffect,be ‘v48thusenablingquick-?lloperationtoequalizethepres trapped by the ori?ce plate 45 notwithstanding its small sure within the parking plunger assembly (pocket D) ori?ce45,andthatthepistonwillbestoppedinitsleft 25 withtheworkingpressureexistinginmotorchamberC. ward movement with the left hand face of the piston head at the normal—stroke-limit diagrammatically indicated at L. In that event, pressure will build up in the right hand chamber C’ of the motor M causing movement of the re versingpiston17ofactuatormechanism6totheleftand 30 ceedingstroke. thereby causing toggling action of the mechanism 12 and rightward movement of valve plugs 18 and 19 to reverse the ?uid routing and consequently initiate a new stroke actiononpartofpistonPortotheright. Inrespectto thismuchoftheoperation,itcanbeassumedthatthere35 connectingrackportion25foroperationofthewiper (not shown), and generally cylindrical reduced diameter portions 50 and 51 forming axial extensions ‘of the head portions. IntheFig.2~illustratedorapproximatelymid stroke position of piston P’ (or at each stroke end posié is negligible leakage between the parking plunger 30 and the bore 32 in the ?tting 23, or that the relatively larger spring 35 has su?icient force to overcome any tendency forsuchleakagetotakeplace. Theabovedescribedop erationisontheassumptionthatthemotoris’operating40 tiononlyifsodesigned)eachofthecylindricalexten the wipers at a cycling speed well above rated or desired minimum speed or such that leakage through the ori?ce 45’ and/or otherwise past the plunger 30 into motor chamberC is‘muchlessthancantakeplaceelsewherein themotorandcontrolvalvesystem. Parkingoperation 'sions 50 and 51 is in slidably ?tting relationship to re spective bores 52’ and 53' of ?ttings 52 and 53 which are similar in shape to the ?ttings 28 of the previously de scribed construction. The extensions St) and 51 are 45 adaptedtoformwiththe?ttings52and53generally closedpocketsD2andD3. Astheextensions50and51 of the piston heads are moved axially in their respective Inorderto'parkthepistonPbeyonditsnormalstroke~7 bores52'and53'onsuccessivepistonstrokes,themotor indicated by length and limits L, Fig. 1, the operator or speed is decelerated by gradual restriction and ultimate attendantadjuststhespeedcontrolvalve1towardclosed50 effectualclosingbythecylinderwalls52'and53'of position until the leakage in the motor and control valve systembecomeslessthantendstooccurthrough(e.g) theori?ce45'. Thus,followingareducedspeedright ward piston stroke and ?uid reversing toggle action, the pistonPwillslowlyapproachitsilustrated’positionin55 mechanismofFigs.2and3. ' . movingleftwardly. Whenthelefthandface24'ofthe head of the piston P encounters the projection 33 of parking plunger 30 at a wiping speed such that the pres sure threshold in chamber C’ necessary to operate the togglemechanism12isnotreachedduetosettingofthe 60of.adeeperaxialbore56inthepistonhead24aandrack manualcontrolormasterValve1forlowspeedopera tion, the piston P will be temporarily arrested by having encountered the adjacent axial end face of the parking plunger30;butthereafterthe?uidtrappedinthepocket D oftheparkingplungerand?ttingassembly28,30,and 65 end face 50" of the piston extension 50 the distance 37, will be squeezed out through the ori?ce 45' in plate 45intothemotorchamberC (whichisnowatexhaustor negligible pressure) until the parking plunger 30 is stop ped by the end wall 28' of the ?tting 28 or the piston head 24 abuts the right hand end of ?tting 28. If the control valve 1 is now allowed to stay open at approxi matelythesamelowspeedsettingasobtainedduringthe parking operation just above described, the piston P will be hydraulically locked in the parked position (left limit L’). ’Alternatively, when the motor piston reaches the 75 prises in this case a metal disc 62 with relatively unre As pressure equalization takes place, the spring 35 re— turns the parking plunger 3% to its Figure l-illustrated position relative to the ?tting 28 for arresting the piston P‘at normal stroke terminal position on its next suc M odi?cd parking mechanism Referring to Figs. 2 and 3, the piston P’ in this case has approximately identical head portions 24a and 24b, ori?ce forming, V-shaped, notches 50’ and 51’ in the re spectiveextensions. Thisconstitutes,ineffect,anal readywellknown-formofshockabsorbingordash-pot device, except for association with the modi?ed parking Thecylindricalextension50(attheleftendonlyof the piston P’ as shown in Figs. 2 and 3, although the construction could be duplicated at both ends if desired) has a cylindrical bore 55 forming a counterbore portion portion25. Theparkingplunger60inthiscaseisslid ably mounted as by a lap ?t in the relatively large bore portion 55 of piston extension 50 and ithas a tubular extension 61 normally projecting leftwardly from the which it is desired that the piston P’ shall move out of or beyondnormalstroketerminalpositionforparking. A coil spring 57 in the pocket or cavity D4, formed by the plunger in cooperation with the bores 55 and 56, acts, in 70 e?ect, on the parking plunger 60 normally to hold it against a leftward stop shown in the form of a snap ring 58intheplunger60. Thequick?llorone-Way-freely acting valve mechanism (corresponding to valve assem bly 44 etc. in the arrangement according to Fig. 1) comPDF Image | FULLER FLUID OPERATED RECIPROCATING MOTORS
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