US1902164A - Piston ring snagging machine - Google Patents

Description

March 21, R A H G PISTON RING SNAGGING MACHINE Filed July 15, 1927 2 Sheets-Sheet l March 21, 1933. R. A. HAEGG I PISTON RING SNAGGING MACHINE Filed July 15, 2 Sheets-Sheet 2 \thtviwixks -50- Figure 1 is a front 'Vi Patented Mar. 21, 1933 cm'rm norms. mac, or nooks-01m; K111111018; ASSIGNOR' TO'BURD HIGH corrrnnssron i .mne com my, or noexronn; rumors; A CORPIOBATION'DE. rumors,

' fish-ma sire"- since-ri e macaw-a This invention relates generally to grim}: ing machines but has particular reference we machine for snagging piston rings mu'ch morej economically and expeditiously than was '8 heretofore possible. 1

'Cast piston rings cannot be machined be: fore the very hard and br ittlesca le has been removed. This scale is usually ground 'ofi andin the past this operation has involved considerable expense as each ring had to be chucked for presentation to the grinder} I have found that the elimination of the chucking step greatly increases production,- enables the use of relatively unskilled labora'n'd; by reason of these. facts,'c'onsiclerably reduces the manufacturing cost. V

In the present case,'the rings are simply fed into the grinding position in front of the grinding face and are engaged oneby one by'an improved means of my invention which serves to press the rings against the grindingface' and simultaneously torot'ate the same sdth'at the peripheries of the rings are ground uniformly. The means comprises a pair of rollers mounted on a head movable" toward; and away from the grinder the rollers being} provided with gears meshing with a gearona driven'shaft j ourn'aled i'n the head forlcom municating-rotation to both rollers in'the' 30 same direction. The rings are grippedby the rollers in the mere act ofr'noving the headtoward the grinder and the ringsarelike'wi'se released in the mere act of withdrawing the head. Thus, the chucking operationis dispensed with and it is unnecessary for' the operator to pick up' and handleeach ring separately as .was the method. i r

-A special feature of the dev-ice' of in- 4 vention lies in the universal adjustability thereof to accommodate various sized" rings:

The rollers which engage the piston rings peripherally, are both mounted for adjust V ment on a radius to bebrought fartherapart or closer, together accordingly asthe rings to be snagged are larger or smaller in 'dianreter. -1

. The mvent on panymg drawings whereindisclose" the roller" drive;

case with the old is illustrated in the" accom scale:

ew of my machinerjrag fs eaa' aa. marge onlythe important parts therofbeing inns: traced and the'he'ad being shown-in section t Fig. Qis a plan view ofFig-fil-with certain parts appearing 'in horizontal jsectionin the pl ane oftheline 2 2 ofFig'. 1; Fig. 3is a plan view of'a head ofinodified or alternative constructionwhich enables ads ustm'entofthe rollers toward and away from i one another td-accoinmodate" difierent' Sizer r w d Fig. 4' is a central vertical section through rig'ia w Thesame or s'iinilar referencf numerals are.

applied to corresponding parts throughout 'theviews'. fl The machine; comprises a work table or' other suitable support 5 onthe frame ofthe machine disposed in a hori zontaljposition front of the; grinding face 6 provided on the grinding"Wheel 7. The latter'jis also carried on'the frame of'the machine and turns-in the a V directionof the arrow a pearing in 'Fig; 1 in a plane substantially at right angles to the Work table 5. The table 5 has a stack of rings 8 received in a holder 9 at one endthereof; A reciprocable slide"10jenters' be neath the stack-to expel the lowermost ringf toapositi'on beneath-a guide 11 and between guides 12 and 13. Tl'ius,'the'rings are fed one by" oneto the grinding position at one end of thetab'le and after the grinding op erationare discharged down the incline 14' onto-a rod or into areceptacle placed to re -g ce'ivethesame. According tomy invention a" workhold ing device, indicated generally by the reference numeral f5, is'provided at" the grinding position for releasal'ily engagin'g therings one by one as theycome'in'to position,- the said device being arranged, to press the rings against the grinding face the manner indicated in Fig. 2, and at the. same time communicate rotation thereto] as indicated by the arrow inthe same figure, s01 that theentire fperiphery"of" the ring is ground to a uniform I extent suflicient to re move the fioughandvery hard and-brittle he *evice 15 comprises a pair ofr'ollers' "16"-, preferablyio-frubber, for friction drive purposes, and arranged to engage the ring at circumferentially spaced points as shown. These rollers have the stems 17 thereof j ournaled in a housing member 18 which therefore constitutes a head or carrier arranged to be moved manually; or otherwise. ,Pinions 19 are provided on: the stem 17 within the housing 18 andmesh with a pinion 20 provided on a driven shaft 21 also journald in the housing 18. The shaft 21, unless itl'has its driving means movable with 'the head, may be a flexible shaft to permit back and forth movement of the head relative to the driving means or may have universal j oint. driving connection to permitof such opera tion; Obviously, the rollers 1.6.aredriven in the same. direction as indicated; byrthe ar rows in Fig. 2 when the'shaftj21 is driven in,

V the direction of thearrow shown in Fig. 1.

Provision may be ,madefor; the automatic; operation of theslide l0 forWardJin the Iretra'cting of. the head .so thata's each ringfis finished another ring is brought intoposition.- The connections :for accomplishing this operation. are not illustratedinasmuch as the same might be of .any suitable form. -It ,willbe apparent from, the foregoing that the present method of operation greatly facilitates thering snagging operation-"by eliminating the necessity for the separate handling of each ring for chucking the same, Relatively unskilled labor may be employed foroperating ajmachine made in accordance with my invention An operator soon becomes quite proficient in the grinding of the rings according to the present simple method 7 and will readily turn out a far greater number of properly snagged rings-per day than could possibly be produced by..the old method.

Referring to Figs. 3 and 4;.wherein I have shown a device 15 of alternative or modified: construction, it will be observed thatithe. head 18 wherein the shaft 21 is journaled has the stemsl7 of the rollers 16 supported thereby on arms 22 and 23 for adjustment in an arcwith the shaft 21 as a center, as clear ingthrough' the hubs of the arms22 against lyindicated in dotted lines inFig, 3., The adjustment of the arms 22 and23 manifestly.

brings the rollers 16 closer-together, as, for

example, to accommodate a ring A- of comparatively. small diameter, or brings the roll-H ers farther apart to accommodate a ring B. of comparatively large diameter. .111 any positionof adjustment of the arms 22 the pinions19 remain, meshed with the pinion 20' and provis on is made; for secur ngthearms,

in any position of: adjustment, as indicated at 1 24, the means comprisingset screws threadthe shank portion of the headlS in relation to which the arms are swingable. It isa very simple matter to adjust the rollers to the; proper; position andvto set the same in their adjusted. position." For most practical .pur-

poses the rollers 16 are set to engage the ring at points angularly displaced at from 90 to 120.

I claim:

' 1. A piston ring snagging machine comprising, in combination, a work support, a rotarygrinderturning in a plane approximately at right angles to the work support and having a side grinding face, said support being arranged to receive piston ring laid flat thereon with the periphery thereof presented to said sidegrinding face, a guide over "said work support serving to hold the piston ring fiat on the support-but permitting turning of said ring and means for simultaneously rotating the ring andpressing the'periphery thereof against the grinding face comprising a pairof driven rollers adapted for engagiing the periphery ofthe ringzat circumferem tially spaced points and to turn in the same direction approximately in the plane of the support and the ringthereomsaidrollers being mounted on and movable bodily with a head whereby the same. are arranged to be moved toward the grinder to press -the ring againstthe same and communicate rotation.

thereto atthe same time, v r i 2. In amachine oft-he character described, arotary grinder for cross grinding the; periphery, of rings-or other circular. pieces, a Work support extending diametrically across the side grinding face of the grinder, means for holding aring on said supportin. a fixed plane but permitting the turning thereof, and a work feedinganddriving head mova-, bletoward and away from the side grinding.

face of the grinder to move the rings one by.

one toward the grinding face and press the same against said face forthe cross grinding of, the periphery thereof and.simultaneously; drive the same, saidheadhaving a pair of laterally spaced rollers for engagingthe periphery of the ring'at spacedpoints so that the ring-isheld therebetween against lateral movementout of grind-ing position,at least one of saidrollers being driven, said head by grinder, meansfor feeding rings over-said;

support to, one side-ofithe grinder and means movable toward and away from the grinding face Ito press the rings one by; one against the face for the cross grinding thereof, said means in addition to pressingthe work against the grinder serving to rotate the same and beingarranged by themere act of moveaway from the ing rotation to said rollers, said rollers being ment toward the grinder to grip the work and by the mere act of movement away-from the grinder to release thesame', said means comprising apair of rollers rotatably mounted on a carrier movable toward andaway from the grinder, said carrier having a driven shaft journaled therein, a gear on said shaft and gea'rsmeshing therewithtmounted on the rollers wherebv rotation isco-nimunicated in the same direction to both of said rollers. g 7 H v 4. Ina machine of the character described a support arranged to receive a'piston ring laidflat thereon, means for cross grinding the periphery of'said' ring when the same is pressed'thereto, and a head having apair' of mately at right angles tothe' work support and a guide over said support servingitohold a ring flat on thesupp'ort while permitting turning thereof, of means for snnultaneously turning the ring and pressing the same to-' ward the grin'derfor cross griiiding of'the periphery thereof, said means comprising'a' head movable'to'wardand away 'from, the grinder having a pair of rollers mounted thereon arranged to bear against the periphery of the ring toward the grinder to press the ring against the same, means for communicating rotation to at least one of the rollers whereby positively to turn the ring, said roll-' ers being mounted on arms swingable with reference to the head to brmg the rollers closer together or farther apart according to the diameter of the ringbeing snagged, and means for securing the arms 111 ad usted positions.

' 6. In a machine of the characterdescribed, a support arranged to receive a piston ring or the like laid fiat thereon, means for cross grinding the periphery of said ring when the same is pressed thereto, and a headhaving a pair of rollers mounted thereon arranged to bear against the periphery of the ring at spaced points to press the ring against the grinding means and at the same time hold it against lateral movement out of grinding po sition, a center driving gear for communicatmounted on arms swingable with reference to the head about the gear center to bring the rollers closer together or farther apart, gears for driving the rollers meshing with the centier gear and arranged in the swingingof thearms: from one position to another to keep-thes'a'memeshing en agement with the center gear, 'and'means for securingthe arms in ad: jus'te'd position.

7. In a machine of the character described," a support arranged to receive a'p'i's'ton or the like laid fiat thereon, means for crossgrindingthe periphery of said ring wherrthe same is pressed thereto, a work feeding and driving head movable toward and away from the grinding means, a driving shaft journaled therein, a center driving g'earofi said shaft driven thereby, a pair of arms having the inner ends thereof received on ab'earing .portionon saidhead concentric-withthe cen-- ter gear, said arms being swingable witliref erence to the head to' 'di fie'rent positions, means for secu-ringtheqarm's to thehead' in adjusted position, rollers mountedfor rotat tion on the outer ends of said'arms and-ar ranged in the adjustment of the arms to be broughtcloser together or farther apart and being arranged to" bear against the periphery of a ring to be ground, and gears for driving said rollers carried therewith on the outer ends of said arms and meshin with the center gear in any position of'adpistment of the arms. Y

S. In amachine of thecharacter' described adapted for peripherally grinding [piston rings or the like, the combination with grinder,'of means for confining a ring grinding pos1t1'0n,-turn1ng therinfg while-so disposed, and pressing the turning ring into peripheral contact with the grinder one point of the rings periphery, sa-id means iii-- eluding a pairof rollers engaging the ring at 7 two points equally spaced circumferentiall'y on either side of the point of contact,at least one of saidrollersbeing driven to communi-s cate drive to the ring by] frictional fcontact' with the periphery thereof, and .a' pair of separate supports for the rollers mounted" for swinging movementto-bringthe rollers closer together or farther apart according" to the outside diameter of the: ring to ground, whereby to maintain. a predetermined ratio between the ring di meter and the spacing of therjol-lerssa'id supports hav:

ing means for securin the same in adjusted position to maintainfiie rollers in a termined' desired spaced relation.

4 9. In a machine for peripherally grindi g circular work pieces such, as pistonirings,l.

prede-l its the combination with agrindenbf a pair.of=

spaced {drive rollers arranged to engage the circular work piece at two points -c i rcum ferentially spaced to'eithersideof the point; where the work pieceengages-the surface of the grinder, means for driving. one or both rollers so they turn inthe samedirectionand a tjjth' same eripheral speed wlierety return the work piece relative to: the s u r face o'f fl1e1 grinder for. the complete peripheral grind determined pressure to eli'ectapredeterof spaced drive rollers arranged for engagement with the periphery of the work piece at two points: spaced circumferentially thereof, said rollers being of compressible resilient material, such as rubber, whereby to afford a good frictional driving connection betweenthe rollers and the work piece when thejparts are pressed together, means for driving one or both rollers sothey turn in the same direction and at the same peripheral speed whereby to .turn the work piece relativeto the grinder for the-complete peripheral grinding thereof, and a member movabletoward and away from the grinder to press and release a work piece with relation thereto, said device being arranged in its forward movement to firstbring the work piece and rollers into drive transmitting relation so as to insure turning of the work piece prior to its engagement with the grincL er, and said member being arranged in its further movement forwardly to press the work piece against the grinder with a premined desired grinding action, the said roll -v ers being at the same time compressed where theyengage the work piece whereby to afford the required good. frictional drive for the work piece. i r

, 11. In amachine for peripherally grinding circular work pieces such as piston rings, the combination with a grinder, of a member movable forwardly and rearwardly with reference to the grinder topress and release a work piece placed betweenthe member and the grinder, .a pair of drive rollers spaced of spaceddrive rollers carried on the other support arranged to engage the work piece at two points circumferentially spaced to either side of the point wherethe work piece engages the surface .of the grinder, said rollers being of compressibleresilient material, such as rubber, whereby to afford a good frictional driving connection betwe'en the rollers and the work piece when the parts are pressed together, means for driving one or both rollers so they turn in the same'direction and at the same peripheral speed whereby to turn the work piece relative to the surface of the grinder, and means for moving the movable support to bring vthe work piece and rollers into operative relation to one another, whereby to cause the work piece to turn, and to exert pressure between the work piece and grinder during the turning of the work piece, whereby to determine the. extent of the grindingaction, the said rollers being at the same time compressed where they engage thework piece whereby to afford the required goodfrietional drive for the work piece. i f

In witness of the foregoing I affix my signature.

RUDQLPH A. HAEGG. f

for-engagement with the periphery of the 7 work piece at two circumferentially spaced points thereon, said rollers being disposed in gages the grinder,'whereby in the forward movement of the member the said rollers come intofengagement with 'the work piece substantially simultaneously, and whereby in the further forward movement of said member to press the work piece into engagement with the grinder, the said rollers exert substantially'the same pressure against the work piece, andvme a'ns for driving one or both rollers so they turn in the same di-

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