SE204389C1

SE204389C1 -

Info

Publication number: SE204389C1
Authority: SE
Publication date: 1965-01-01

Description

Uppfinnare: K Bosch Prioritet beg/lid trek den 9 oktober 1958 (Forbundsrepubliken Tyskland) Foreliggande uppfinning hanfor sig till ett blindnitverktyg vid vilket niten halls i en sparinchuck och nitas genom kraft utifran. Blindnitar kunna sadana nitar benamnas, med vilka man frau en sida kan nita ihop arbetsstycken, t. ex. tva platar, utan att man behover nagot mothall pa den andra sidan, vilken kan vara svar- eller oatkomlig. Blindnitarna besta vasentligen av en deformerbar, hylsformig halnit, i vars borrning man ph forhand ter en dorn, som i omradet for den satthuvudet motsatta nitanden är pa sadant salt f ortjockad, att den vid tvangsmhssig utclragning ur halniten deformerar denim, speeiellt for aft vid den varmda och satthuvudet motsatta nitanden bilda stukhuvudet. Denna ande ph halniten kan alltsit fOrlaggas till en sida av nitfogen som kan vara oatkomlig, varfor niten kan nitas »Minh pa denna sida. Dornen dras antingen helt genom halniten, sit att denna invandigt forblir ihalig, eller ocksa insatter man i haligheten fran nitningssidan ett sarskilt stift eller utbildar dornen sit att den vid viss dragkraft brister, varvid sit mycket av dorneri stannar kvar i halniten, att denna blir vdsentligen fylld fram till satthuvudet. Det avbrutna dornskaftet kastas bort. Inventor: K Bosch Priority Beg / lid trek October 9, 1958 (Federal Republic of Germany) The present invention relates to a blind rivet tool in which the rivet is held in a sparin chuck and riveted by force from the outside. Blind rivets can be called such rivets, with which one side can be riveted together workpieces, e.g. two plates, without the need for any counterweight on the other side, which may be unresponsive or inaccessible. The blind rivets consist essentially of a deformable, sleeve-shaped halnet, in the bore of which a mandrel is formed, which in the area of the rivet opposite the rivet is thickened to such a salt that it deforms denim when forced out of the halite, especially at the heated and the set head opposite the rivet form the stucco head. This spirit ph halnite can thus be moved to a side of the rivet joint which may be inaccessible, for which reason the rivet can be riveted »Minh on this side. The mandrel is either pulled completely through the halnite, so that it remains inwardly hollow, or you insert a special pin in the halo from the rivet side or train the mandrel to fail at a certain traction, whereby much of the thorny remains in the halnite, that this becomes essentially filled up to the set head. The broken mandrel shaft is discarded.

FOreliggande uppfinning hanfor sig till ett pneumatiskt-hydrauliskt verktyg f8r blindnitning, I vilket den med spannehucken for nitskaftet samverkande arbetskolven drivs av hydraulmedium, vars hoga arbetstryck erhalIes genom omvandling medelst en pneumatisk-hydraulisk kraftkolvanordning frail ett lagt pneumatiskt matningstryck, for Tars reglering en manuellt manovrerad tilloppsventil anordnad. The present invention relates to a pneumatic-hydraulic tool for blind riveting, in which the working piston cooperating with the clamping hub for the rivet shaft is driven by hydraulic medium, the high working pressure of which is obtained by conversion by means of a pneumatic-hydraulic power piston device. inlet valve arranged.

Enligt uppfinningen fir en flakier tillordnad arbetskolven och anordnad att efter nitskaftets avslitning frterfora saval arbetskolven som den pneumatisk-hydrauliska kraftkolvanordningen till utgangslaget. According to the invention, a flaker is assigned to the working piston and arranged to carry the working piston as the pneumatic-hydraulic power piston device to the starting layer after the wear of the rivet shaft.

Detta ger ett verktyg av enkel konstruktion och sma dimensioner och lag vikt. This provides a tool of simple construction and small dimensions and team weight.

Ytterligare kannetecken, fordelar och anvandningsmojligheter for uppfinningen komma att framga av de pa bifogade ritning visa-de utforingsememplen samt den ,efterfoljande beskrivningen av dessa. Additional features, advantages and possibilities of use of the invention will become apparent from the exemplary embodiments shown in the accompanying drawing and the subsequent description thereof.

Pit ritningen visar fig. 1 en ldngdsektion genom en utfOringsform av ett nitverktyg, fig. 2 i storre skala en sektion genom spannchucken med driTmekanism och verktygsnos och fig. 3a-3d schematiskt en nitfog. In the drawing the drawing shows Fig. 1 a length section through an embodiment of a riveting tool, Fig. 2 on a larger scale a section through the clamping chuck with a drive mechanism and tool nose and Figs. 3a-3d schematically a riveting joint.

Nitverktyget i fig. 1 har ett langstrackt, rorformigt hus 1, i vilket den pneumatiska ariordningen 2 och den hydrauliska anordningen 3 aro anordnade, och ett i frail 900 nhgot ayvikande vinkel pasatt, likaIedes rorformigt hus 6, som upptager arbetskolven 5 och uppbar den likasa rorformiga verktygsnosen 48, som it sin sida omsluter spannchucken 4. The rivet tool in Fig. 1 has an elongate, tubular housing 1, in which the pneumatic array device 2 and the hydraulic device 3 are arranged, and an angle slightly deviated in frail 900, as well as a tubular housing 6, which receives the working piston 5 and carries the same tubular tool nose 48, which in turn encloses the clamping chuck 4 on its side.

Huset 1 bestar av tvh. delar 7 och 8 med aka diameter, varav delen 7 upptager den hydrauliska och delen 8 den pneumatiska anordningen. Den sasom handtag tjanande delen 7 fir utv5.ndigt forsedd med en icke nfirmare visit lettring 9. Matten pit verktyget aro sit avpassade, att dess tyngdpunkt ligger inom delen 7. House 1 consists of tvh. parts 7 and 8 with aka diameter, of which part 7 receives the hydraulic and part 8 the pneumatic device. The part 7 serving as the handle is externally provided with a non-firming visit letter 9. The mat of the tool is adapted so that its center of gravity is within the part 7.

Delen 8 har pa sin undersida ett utsprang 10 som framat overgar i ett avsneddat, gaffelformigt parti 11, i vilket manoverspaken 13 2 ph verktyget dr svangbart lagrad pa en axel 12, varvid spaken genom overforingselement och en ventil 17 kan oppna lufttillforseln genom ett kopplingsstyeke 15, ingangat i cylinderns 8 bakande 14. The part 8 has on its underside a projection 10 which forwards merges into a bevelled, fork-shaped portion 11, in which the operating lever 13 2 ph tool is pivotally mounted on a shaft 12, whereby the lever through transfer elements and a valve 17 can open the air supply through a coupling piece 15 , entered in the baking 14 of the cylinder 8.

Utspranget 10 har en med delarnas 7 och 8 axel parallell borrning 16, som i narheten av tryckluftskopplingen 15 endast fOga vidgad (vid 16a) och fortshttningsvis är vidgad mera och motsvarande kopplingens diameter (vid 16b). I den vidgade delen är monterad tryckventilen 17, som under pauser i driften av fjadern 18 bringas att sparra tryckluftstillforseln I pilens 19 riktning och dessutom medelst ett i borrningen 16 glidfOrskjutbart r8r 20 är forenad med spaken 13. ROret 20 anligger nor-malt mot spakens 13 andyta 21 och omsluter en fjader 22 vars ena ande tryeker mot yentilen 17 och vars andra ande vilar mot den avsmalnande anden 23 ph roret 20 och pressar detta mot ,andytan 21, sâ att mellan ventilen och den an.dra anden 24 ph roret ett mellanrum 25 uppstar. Dessutom uppvisar utspranget 10 en kanal 26 som forenar den endast obetydligt vidgade delen 16a av borrningen 16 med det pneumatiska systemet. The projection 10 has a bore 16 parallel to the axis of the parts 7 and 8, which in the vicinity of the compressed air coupling 15 is only slightly widened (at 16a) and is further widened further and corresponding to the diameter of the coupling (at 16b). Mounted in the widened part is the pressure valve 17, which during pauses in the operation of the spring 18 is caused to spar the compressed air supply In the direction of the arrow 19 and also by means of a slidable tube 20 in the bore 16 is connected to the lever 13. The tube 20 normally abuts the lever 13 end face 21 and encloses a spring 22 whose one spirit presses against the yentil 17 and whose other spirit rests against the tapered spirit 23 ph rudder 20 and presses it against, the end face 21, so that between the valve and the other spirit 24 ph rudder a gap 25 arises. In addition, the projection 10 has a channel 26 which joins the only slightly widened part 16a of the bore 16 with the pneumatic system.

Det pneumatiska systemet bestar I huvudsak av en cylinder 27, vars bakande Sr tillsluten med ett lock 28, och av en kolv 29 som glider i cylindern 27 och delar denna i tvh. kamrar 27a och 27b. Kolvstangen 30 pd kolvan 29 skjuter utanfor cylindern 27 och tranger vid sin rorelse ut ur cylindern 27 in i den hydrauliska cylinderns 7 halrum. Kolystangen 30 har en vasentligt mindre diameter an kolven 29. FraLure Linden 31 pa cylindern 27 star genom en utloppsoppning 32 i fOrbindelse med atmosfaren. Kolvens 29 slag Sr belaget mellan utloppsoppningen 32 och kanalen 26. The pneumatic system consists mainly of a cylinder 27, the rear of which is closed with a lid 28, and of a piston 29 which slides in the cylinder 27 and divides it in two. chambers 27a and 27b. The piston rod 30 on the piston 29 projects outside the cylinder 27 and in its movement pushes out of the cylinder 27 into the cavity of the hydraulic cylinder 7. The coil rod 30 has a substantially smaller diameter than the piston 29. FraLure Linden 31 on the cylinder 27 stands through an outlet opening 32 in communication with the atmosphere. The stroke of the piston 29 is located between the outlet opening 32 and the channel 26.

Det hydrauliska systemet 3 bestar i det väsentliga Mott av en cylinder 33, som Sr helt fylld med vhtska 36, som vid den visade utf8- ringsformen ifyllts genom oppningen 35, som kan tan tillslut as med den gangade proppen 34. Emellertid kan man i stallet fylla i vatskan frail bakanden 39 ph cylindern 7 och for detta andamal isartagbart forena cylindrarna 7 och 8, t. ex. genom en viii Mande gangf Orbindning. Diametern hos den hydrauliska cylindern 33 är avsevart mindre Sn diametern ph den pneumatiska cylindern 27. Framanden 37 pi den hydrauliska cylindern 33 uppvisar en borrning 38 for tillfOrande av hydraulisk vatska till drivanordningen 5 fOr spannehucken 4. Vid bakanden 39 ph cylinderhuset 7 Sr en propp 40 inskruvad med en glid8ppning 41 passande for kolvstangen 30. Proppen Sr medelst 0-ringar 42 och 43 sa. tatande fast; skruvad, att nagon vatska inte kan tanga in i den pneumatiska cylindern 27. Man kan Sven utelamna proppen 40 och utbilda cylinderhuset 7 ph sadant satt ph motsvarande stSlle, att dar en lagring och styrning for kolvstangen 30 erhalles. The hydraulic system 3 consists essentially of a cylinder 33, which is completely filled with liquid 36, which in the embodiment shown is filled through the opening 35, which can be closed with the stepped plug 34. However, in the stable fill in the liquid frail the rear end 39 ph the cylinder 7 and for this purpose disassemble the cylinders 7 and 8, e.g. by a viii Mande gangf Orbindning. The diameter of the hydraulic cylinder 33 is considerably smaller. The diameter of the pneumatic cylinder 27. The front 37 of the hydraulic cylinder 33 has a bore 38 for supplying hydraulic fluid to the drive device 5 for the clamping hook 4. At the rear end 39 the cylinder housing 7 is a plug 40. screwed in with a sliding opening 41 suitable for the piston rod 30. The plug Sr by means of O-rings 42 and 43 sa. tatande fast; screwed, that no liquid can force into the pneumatic cylinder 27. Sven can omit the plug 40 and train the cylinder housing 7 ph so set ph corresponding position, that there a bearing and control for the piston rod 30 is obtained.

Den tvars och na.got snett pa den cylindriska delen 7 anbragta, likaledes cylindriska kroppen 6 har en axiell genomgaende borrning som har tre avsnitt 44, 45, 46 med olika diameter. Avsnittet 44 utgor cylinder for arbetskolven 5, avsnittet 45 styrning for forbindningsstycket mellan denna drivanordning och spannchucken 4 med en 0-ring 47, och avsnittet 46 utgor anslutning for spannchuckens 4 has, verktygsnosen 48. The transversely and slightly obliquely arranged on the cylindrical part 7, likewise the cylindrical body 6 has an axial through-bore which has three sections 44, 45, 46 of different diameters. The section 44 forms a cylinder for the working piston 5, the section 45 forms a guide for the connecting piece between this drive device and the clamping chuck 4 with an 0-ring 47, and the section 46 forms a connection for the shaft of the clamping chuck 4, the tool nose 48.

Spannehucken 4 (se shrskilt fig. 2) bestar vasentligen av en hylsa 49 med ett in- och utvandigt koniskt andparti 50 och ett mellanstycke 51. I det koniska hylspartiet 50 aro spannbackarna 52 inlagda, vilkas andytor 53, 54 likaledes dro koniska. Spannbackarna, till antalet foretradesvis endast tva, uppvisa vi-dare ett axiellt spar 69a resp. 59b, vars, tvarsnittsform Sr en cirkelsektor, foretradesvis nastan en halvcirkel, och forsedda med tvarhack fOr battre fasthallande av nitdornarnas skaft. Mellanstycket 51 Sr inskruvat i den cylindriska delen 55 av hylsan 49 och har en borrning 51a, i vilken en fjfider 56 Sr insatt, som a sin sida genom ett rOrformigt tryckstycke 57 pressar spannbackarna 52 mot deras slutande lage. Den med spannbackarna samverkande anden 58 ph tryckstycket Sr i motsvarighet till backarnas koniska ytor koniskt utbildad. Den av sparen i backarna bildade axiella genomgangen 59 saval som den genomgaende mittborrningen 60 i tryckstycket och skruvfjaderns 56 innerhalighet ligga i rad efter varandra och bilda en med dubbelpilen a betecknad genomgangs8ppning. Koncentriskt med undre anden 61 pd. hylsan 49 Sr i verktygsnosen 48 ett foretradesvis magnetiskt munstycke 62 med axiell borrning 63 inskruvat, vilken borrning Sr koaxiell med genomgangsborrningen a. Munstycket 62 kan ha annan form dn den visade, t. ex. vara langre och smalare, sa att svartillgangliga nitstallen battre kunna nas. The clamping huck 4 (see separate Fig. 2) essentially consists of a sleeve 49 with an inner and outer conical duct portion 50 and an intermediate piece 51. In the conical sleeve portion 50 the clamping jaws 52 are inserted, the end faces 53, 54 of which likewise drew conical. The clamping jaws, preferably only two in number, further have an axial groove 69a resp. 59b, the cross-sectional shape of which is a sector of a circle, preferably almost a semicircle, and provided with cross-notches for better holding of the shaft of the rivet mandrels. The intermediate piece 51 Sr is screwed into the cylindrical part 55 of the sleeve 49 and has a bore 51a, in which a spring 56 Sr is inserted, which in turn is pressed by a tubular pressure piece 57 against the clamping jaws 52 against their closing layer. The spirit 58 cooperating with the bucket jaws is a pressure piece Sr corresponding to the conical surfaces of the jaws. The axial passage 59 formed by the grooves in the jaws, as well as the through-going central bore 60 in the pressure piece and the interiority of the coil spring 56, lie in a row one after the other and form a passage opening designated by the double arrow a. Concentric with lower second 61 pd. the sleeve 49 Sr in the tool nose 48 preferably a magnetic nozzle 62 with axial bore 63 screwed in, which bore Sr coaxial with the through-bore a. The nozzle 62 may have a different shape from the one shown, e.g. be longer and narrower, so that black-accessible rivets can be better reached.

Arbetskolven 5 bestar vasentligen av en i den cylindriska delen 44 glidbar kolv 64, som pa bada sidor Sr fOrenad med en central kolvstang 65 resp. 66. Kolvstangerna och kolven ha en gemensam, genomgaende langsborrning 67 som likaledes Sr koaxiell med den ovannamnda genomgangsborrningen a och tillsammans med denna bildar en genom spannehucken och den bakomvarande drivmekanismen ghende kanal, som vid bakre anden ph drivmekanismen Sr betecknad A. The working piston 5 essentially consists of a piston 64 slidable in the cylindrical part 44, which on both sides is connected to a central piston rod 65 and 65, respectively. 66. The piston rods and the piston have a common, continuous longitudinal bore 67 which is also coaxial with the above-mentioned through-bore a and together with this forms a channel extending through the clamping hub and the rear drive mechanism, which at the rear end ph the drive mechanism Sr denoted A.

Mekanismen 5, hylsan 49 och mellanstycket hos chucken 4 Oro stelt fOrenade medelst 3 kolvstangen 65, som ãr inskruvad i mellan- na. Nu strommar tryckluften genom kanalen stycket 51.26 till kammaren 27a i det pneumatiska sy- Den framre gaveln 68 pa cylindern 44 utgor stemet och pressar kolven 29 framat, pa ritanslag for kolven 64 och är Oppen mot kana- ningen at vanster. Harigenom trycks samtilen 38 genom vilken hydrauliskt medium till digt kolvstangen 30 in i cylindern 33 i det drivmekanismen intrader. Ovre anden pa den- hydrauliska systemet, varigenom tryckvatska na cylinder bildas av ett lock 69 med en axiell 36, t. ex. tryckolja, trangs ut genom 5ppningborrning 70, i vilken kolvstangen 66 glider. en 38. Den uttrangda oljan verkar pa drivmeDenna kolvstang styr samtidigt en densamma kanismens 5 kolv 64 sã att kolven forskjuts .omslutande skruvfjader 71, vans ena ande an- i pilens 74 riktning (fig. 2). Darmed–forskjuligger mot lockets 69 insida 72 och vans andra tas ocksa mellanstycket 51 och hylsan 49 i Ande st8djer mot kolven 64 och pressar denna samma riktning (halal frau munstycket 62). mot dess vilolage mot anslagsytan 68. Fjadern Enar spannbackarna 52 genom tryckstycket 71 är sa kraftig, att den aterfor bade det 47 av fjadern 56 mot den namnda rOrelserikthydrauliska och det pneumatiska systemet till ningen sta under en pa forhand installhar, i dess utgangslage, nar nitningen är fullbordad. vilolaget av munstyckets 62 bakre koniska yta Pa omkretsen av kolven 64 Or en 0-ring 73 upptagen tryckpakanning kommer en relativinlagd som hindrar en joke onskvard lackning rorelse mellan de mot varandra anliggande av hydrauliskt medium 36 till cylindern 44. . ytorna pa spannbackarna 52 och de koniska Verktyget enligt fig. 1 och 2 arbetar ph f61- delarna 50 pa hylsan 49 att dga rum, enar jande satt. FOre anvandningen maste det hyd- skruvfjadern 56 genom tryckstyeket 57 s5ker rauliska systemet fullstandigt fyllas med halla spannbackarna 52 i anliggning mot den vatska. Kolven 64 och kolven 29 i det pneu- koniska ytan pa munstycket 62. Pa grund av matiska systemet 2 befinna sig i utgangs- och denna relativrorelse f5ras spannbackarna mot vilolage (fig. 1).varandra, dvs. den mellan dem befintliga ge- Verktyget anslutes med kopplingsstycket 15 nomgangsoppningen 59 blir trangre, sâ att och en joke visad tryckluftsslang till en tryek- dornskaftet 78 grips och fastklammes. Nu faluftskalla och en ventil e. d. 5ppnas, sa att ras spannbackarna av den koniska delen 50 tryckluften star till fOrfogande vid kopplings- av hylsan tvangsmassigt bort fran munstycket stycket 15. Nu sticks skaftet 78 pa nitdornen 62, varigenom dornskaftet av spannbackarna 76 (jfr aven fig. 3a-3d) genom borrningen annu hardare fastklanames och fiires vidare i 63 i munstycket 62 och den av spannbackarna samma riktning (pilen 74 i fig. 2) tills dorn52 och dessas spar 59a, 59b bildade kanalen skaftet slutligen brister vid ett anvisningsstalin i borrningen 60 i tryekstycket 57. Den ur le. Den harvid upptradande axiella dragkrafverktyget utskjutande anden pa dornen 76 ten upptages av munstyckets 62 anliggning omsluts av halnitkroppen 75. Detta instickan- mot halnitens 75 satthuvud 84. de av dornskaftet 78 i verktyget kan ske an-Dornskaftets bristning fornimmes av nita- tingen innan halnit och dorn insattas i nitha- ren som en MU rekyl och foranleder hans let, i vilket fall insattningen i detta sker med slappande av spaken 13. Alla ifragakommande verktyget, som darvid utg5r hallare och styr- delar foras darefter av fjadern 71 ater till utdon, eller ocksa satts niten med den dari in- gangslaget. Vid det beskrivna arbetsfOrloppet stuckna dornen forst i nithalet och skjuts upptrader den ytterligare fordelen att flagon verktyget darefter Over med borrningen 63 i kompression av den i kammaren 27b befintmunstycket, sparet 59 mellan spannbackarna liga luften icke astadkommes av kolystangen .och borrningen 60 i tryckstycket. Dornens in- enar luften kan bortga genom oppningen 32. trangningslangd i verktyget begransas av satt- Inte heller vid kolvens atergang sker flagon huvudet 84 vid den narmaste anden pa den kompression, enar utstromning ager rum geihaliga niten 75. Satthuvudet bildar tillika ett nom kanalen 26, den vidgade borrningsdelen rorelsebegransande anslag vid instickande av 16a, mellanrummet 25 och roret 20. niten i nithalet och anligger mot den sida avFig. 3a-3d visa schematiskt nagra faser i nitfogen frail vilken nitningen sker.nitningsforloppet. Niten bestar som redan Nar niten liar stuckits helt in i nithalet och namnts av en halnit 75 och en betydligt langre det utskjutande skaftet pa nitdornen har gri- dorn 76 med huvud 77 och skaft 78. Den kom- pits av nitverktyget, kan sjalva nitningenpletta niten, dvs. halnit+dorn, sticks in genom ja. Genom intryckning av spaken 13, t. ex. nithalet 79, som t. ex. genomgar tva. platar 80, med tva fingrar pa den som handtag utbil- 81, som skola hopfogas. Niten sticks genom dade cylinderkroppen 7 omgripande handen fran den i figurerna undre sidan. For denna hos nitaren, Mrs caret 20 mot ventilen 17 till operation kan, sasom tidigare beskrivits, verkanslag mot denna och mot verkan av tryck- tyget anvandas. fjadern, t. ex. en skruvfjader 18, oppnar den-SA. snart medelst verktyget den med en pil 4 betecknade dragningen utovaS i dornskaftet 78 drages detta jamte den dartill anslutande avsatsen 83 och huvudet 77 axiellt genom halniten, varvid den axiella dragkraften sasom beskrivits upptages genom munstyckets 62 anliggning mot satthuvudet 84. Genom indragande av delarna 83 och 77 pa dornen i den koniska utvidgningen 85 vid stukanden pa niten 75 deformeras denim enligt fig. 3b och 3c, varvid samtidigt de element 80, 81 som skola hopfogas pressas mot varandra och in-hordes forenas. Harvid deformeras halniten, sa att f8rst dess utaufor elementet 80 utskjutande del erhaller en bulbartad utvidgning och radiell undantrangning vid delens 80 yta. Fortrangandet av nitens pa detta stalle fortjockade gods astadkoms vasentligen av dornens delar 83 och 77. Vid fortsatt axiell dragning i dornen (fig. 3c) pressas materialet i niten 75 mot innervaggen i nithalet 79 genom delarna 80 och 81. Den vid stuk5nden utskjutande skaftdelen pa niten. 75 stukas in Over dornhuvudet 77 och kommer att vdsentligen omsluta detta. The mechanism 5, the sleeve 49 and the intermediate piece of the chuck 4 are rigidly connected by means of the piston rod 65, which is screwed into the middle. The compressed air now flows through the duct piece 51.26 to the chamber 27a in the pneumatic system. The front end 68 of the cylinder 44 forms the stem and presses the piston 29 forward, on the drawing stop for the piston 64 and is open to the duct on the left. As a result, the shaft 38 is pushed through which hydraulic medium to the piston rod 30 into the cylinder 33 of the drive mechanism enters. The upper spirit of the hydraulic system, whereby the pressurized cylinders are formed by a cover 69 with an axial 36, e.g. pressure oil, forced out through opening bore 70, in which the piston rod 66 slides. en 38. The expelled oil acts on the driveThis piston rod simultaneously guides a piston 64 of the same cannula 5 so that the piston is displaced around the coil spring 71, one end of which in the direction of the arrow 74 (Fig. 2). Thereby - facing the inside 72 of the lid 69 and the other of the vane, the intermediate piece 51 and the sleeve 49 in the spirit are also supported against the piston 64 and press this in the same direction (halal frau the nozzle 62). against its resting layer against the abutment surface 68. The spring unites the clamping jaws 52 through the pressure piece 71 is so strong that it returns the 47 of the spring 56 to the said directional hydraulic and the pneumatic system to the stand during a pre-installation, in its initial position, when riveting is completed. the resting layer of the rear conical surface of the nozzle 62 On the circumference of the piston 64 Or an O-ring 73 accommodated pressure gasket comes a relative insert which prevents a joke unwanted varnishing movement between the abutting hydraulic medium 36 to the cylinder 44.. the surfaces of the clamping jaws 52 and the conical tool according to Figs. 1 and 2, the ph f61 parts 50 on the sleeve 49 work to accommodate each other. Prior to use, the hydraulic coil spring 56 through the pressure piece 57 must ensure that the rudder system is completely filled with the sloping jaws 52 abutting the fluid. The piston 64 and the piston 29 in the pneumatic surface of the nozzle 62. Due to the mathematical system 2 being in the output and this relative motion, the clamping jaws are moved against resting positions (Fig. 1). the connecting object between the existing passages 59 becomes narrower, so that and a joke shown compressed air hose to a pressure shaft shaft 78 is gripped and clamped. Now the false air head and a valve are opened, so that the clamping jaws of the conical part 50 are the compressed air available at the coupling of the sleeve forcibly away from the nozzle piece 15. Now the shaft 78 is inserted on the rivet mandrel 62, whereby the mandrel shaft of the clamping jaws 76 (cf. also fig. 3a-3d) through the bore even harder clanings are clamped and continued further in 63 in the nozzle 62 and the direction of the jaws in the same direction (arrow 74 in Fig. 2) until the mandrel 52 and their grooves 59a, 59b formed the channel shaft finally burst at an instruction stalin in the bore 60 in the printing piece 57. The ur le. The axial traction tool projecting at the mandrel 76 is received by the abutment 62 of the nozzle 62 and is enclosed by the halter body 75. This insertion against the set head 84 of the halter 75 can be done by the mandrel shaft 78 in the tool. the mandrel is inserted into the rivet as a MU recoil and causes its let, in which case the insertion in this takes place by relaxing the lever 13. All the tool in question, which thereby constitutes holders and guide parts, is then carried by the spring 71 back to the outlet, or also set the rivet with the dari entrance team. In the process described, the mandrel is first inserted into the rivet and pushed, the further advantage is that the flake tool is then over with the bore 63 in compression of the nozzle in the chamber 27b, the gap 59 between the clamping jaws the air is not provided by the coal rod and the bore 60 in the thrust. The air in the mandrel can pass through the opening 32. The length of the thrust in the tool is limited by the set head. Also at the return of the piston the flap head 84 occurs at the nearest end of the compression, one outflow takes place in the rivet 75. The set head also forms a channel 26. , the widened bore part movement-restricting abutment at insertion of 16a, the gap 25 and the rudder 20. rivet in the rivet hole and abuts against the side of Fig. 3a-3d schematically show some phases in the rivet joint from which the riveting takes place. The rivet remains as already When the rivet is fully inserted into the rivet and named by a halved rivet 75 and a much longer the protruding shaft on the rivet mandrel has the grid 76 with head 77 and shaft 78. It is composed of the rivet tool, the rivet itself can stain the rivet , i.e. halnit + mandrel, insert through yes. By depressing the lever 13, e.g. nithalet 79, which e.g. undergoes two. plates 80, with two fingers on it as handle utbil- 81, which should be joined. The rivet is inserted through the folded cylinder body 7 enclosing the hand from the lower side of the figures. For this of the rivet, Mrs caret 20 against the valve 17 for operation, as previously described, action against it and against the action of the pressure fabric can be used. the spring, e.g. a coil spring 18, it opens-SA. soon by means of the tool the pull indicated by an arrow 4 in the mandrel shaft 78 is pulled together with the adjacent ledge 83 and the head 77 axially through the halnite, the axial pulling force as described being absorbed by the abutment of the nozzle 62 against the set head 84. By retracting the parts 83 and 77 on the mandrel in the conical extension 85 at the abutment of the rivet 75, the denim according to Figs. In this case, the halnite is deformed, so that only its projecting part outside the element 80 obtains a bulging extension and radial displacement at the surface of the part 80. The displacement of the rivet-thickened goods in this place is essentially effected by the parts 83 and 77 of the mandrel. With continued axial pulling in the mandrel (Fig. 3c) the material in the rivet 75 is pressed against the inner cradle of the rivet 79 through the parts 80 and 81. niten. 75 is sprained over the mandrel head 77 and will substantially enclose it.

Efter dessa deformationer astadkommes genom fortsaft axiell dragning i dornskaftet 78 med spannbackarna 52 att skaftet brister p. ett darfor avsett stalk 86 med. reducerat tvarsnitt. Den overskjutande, brustna skaftdelen kastas av nitpistolen ut framat eller bakat. Niten har nu den i fig. 3d visade formen. Den i niten kvarsittande delen av dornen bildar ett fyllnads- och forstyvningselement, som hindras frau att falla bort .sa.val av stukhuvudet som av det radiella trycket mot borrningen nlien. 75 och genom denna mot borrningen 79 I de hopfogade delarna 80, 81. Skjuv- 'och draghallfastheten hos denna nitfog dr enligt erfarenhet mycket god, varf Sr dess anandning r lamplig ddr stora pakanningar tpptrada. After these deformations, it is ensured by continued axial pulling in the mandrel shaft 78 with the clamping jaws 52 that the shaft breaks on a stalk 86 intended for this purpose. reduced cross section. The excess, broken shaft part is thrown by the rivet gun out forwards or backwards. The rivet now has the shape shown in Fig. 3d. The part of the mandrel remaining in the rivet forms a filling and stiffening element, which is prevented from falling off by the choice of the stucco head as well as by the radial pressure against the bore nlien. 75 and through it against the bore 79 In the joined parts 80, 81. The shear and tensile strength of this rivet joint is, according to experience, very good, wherefore its breathability is suitable when large packing jugs are tpptrada.

Claims

Patent claim:

1. Pneumatic-hydraulic tool for blind riveting, in which the working piston cooperating with the clamping shaft for the rivet shaft is driven by hydraulic medium, Tars high working pressure is achieved by conversion by means of a pneumatic-hydraulic power piston device from a set pneumatic feed pressure, for which control is manually controlled. arranged, characterized in that a spring (71) is associated with the working piston (5) and arranged that after the wear of the rivet shaft Ater-Ora sâvSl the working piston as the pneumatic hydraulic power piston device (29, 30) to the starting stroke.

Tool according to claim 1, frame-marked by the aft spring (71) Sr arranged in the rear part of the cylinder (6) for the working piston (5).

Tools according to patent claims 1 and 2, characterized by a rigid abutment, preferably the cylinder bottom (6a), arranged to absorb the force from the tensioning return spring (71).

Tool according to claim 2 or 3, characterized in that a removable cover (69) is fitted to the free end of the cylinder (6) of the working piston (5).

Tool according to patent claim 4, characterized in that the working piston (5) has a tubular extension, around which the spring (71), preferably one. coil spring, hr arranged, which extends between the working piston (5) and the cover (69). 6. A tool according to claims 1-5, characterized in that the pneumatic-hydraulic power piston device pa. per se edge salt has a piston rod (30), which during the formation of a. water jacket inserts into a hydraulic cylinder (33) and at its second breath carried the pneumatic piston (29). Tool according to claim 6, characterized in that the hydraulic cylinder (33) is closed by means of a stuffing box (40), through which the piston rod (30) passes and whose packing ring (42) is the only guide for the piston rod. Tool according to claims 1-7, characterized in that the spring (71) is arranged to expel the pneumatic medium through a drain valve (17, 18, 22, 25), which at the same time is formed as an inlet valve for the pneumatic supply pressure. Tool according to claim 8, characterized in that the inlet and drain valve has a valve plate (17) which can be slid between two springs (18, 22), which on impact on. the tool by means of a sea rod (13) saps compressed air into the pneumatic cylinder. (27) and in the resting position of the sea rod (13) the spent pneumatic medium escapes through a tube (20). Request Publications: U.S. Patent Nos. 2,526,956, 2,820,56

Agent: Giviling. H Onn, Stockholm