US2724932A - Bearing cap grinder - Google Patents

Description

Nov. 29, 1955 F. A. WAGNER BEARING CAP GRINDER Filed Dec. 20, 1952 INVENTOR.

FREDERICK/I. WAGNER BY :rhv

ATTORNEY Unite States Patent 2,724,932 :Patented 1NOV.=u29, 1:955

aza ea vs;BIilARlltlG GRINDER Freder k .A. .Wggt r,.Liyermor ttqali Application, December 205 1952) Serial Nou'322507 7 59m n ttc t fi m-1Z This I invention relates-togrinding -rnachines-particularly arranged and adapted --for -facing-ofl-the edgesof bearing caps andablocks, -especially the -crankshaft-bearing ends .":of -conneeting. rods preparatory to reboring or regr indsing and honing such bearings to restoretheir rotundity.

The principal objects of the invention areteprovideime-provernents in suchgrindingma'chines whereby extreme --I-aeeuracy .is assured through simpleoperations-quickly performed.

mBriefly tdescribed my-improvedgrinding nachine com- =-prises a rim or= cup; shaped motordriven-emerywheel or I tether grindstone operatively i mounted on a-heavy-base,

and past the edge ofiiwhich swings-a pivotally-mounted oai riageortable'upon-which thbearing-block or cap is "clamped; to thereby -face off the edge obthe cap w-hi ch' is adjacentnthe stone to a degree-predeterminecLbyan -ad- .'.justable-\ oontactgauge carried by --sa-id-base; the swing :lttablerbeing-aalso pivoteddo said base and manually-opermated.

u-Specifiohfeat-ures 20f novel construction will appearvin wi'the' following description.andaccompanying drawings.

i Fig. is aperspective view of myimprovedbearingtcap grinder, las rnanu-fiactured, -and-ineorporating also a hone rotor grinding andx finishing the bores the' bearings-after mth'eirblocks have been; groundelf along their split-junc --ture.

I Big-: 2.is aplan view of the swingingcarriage,- with the :-.-.t-able.and clamping-'plate-aremovd.

{Bigz: 3; is aplan =view-of the table plate.

Big; 4 is a' side elevation:oflthenppenend ofitheswing: a r; ting-carri-agewithtable plate and bearing elamp in pla'w.

:sEigi: 5.-is amend: elevatiom of the gage on its-pedestal ushowmin operative --relat-ion--twil ig. 4.

Fig. 6 is a front elevation of the gage on its-pedestal.

Zia aplan yiew Pa tiea e shhwah itt to the table plate and to the c uppeden ery wheel or other grinding stone.

3i nt i fih fi tlil,..ah lnwithtmffilfqll ezfirst totEigt '1, h nrnerala 1 esign tcs. a he vy ha eeblock provided: with w l U'PP E .h. :2: tl jibp t dl-asm t tian nwhich met r.- is directaeonnected we? d i el'L l P.Rd,.g l 5jil g.Wh6k 5 partiallytenclosed in 1-1. ahcu hn tfials tse dwtott e surfaced portion zr fil he .r e win ing.qartiagee mprises a bracket 7,;carsin edte a ei-r gid.llprig tam 8;-\.fQ,r;-.m: in egralawi th a massive bar 9 which; entends horigontally parallel to the axis of the motor and grinding wheel axis and is support ed on conical pivot bearings ltl seated jn eqrnplementary sockets 10' formed in opposite sides of the base 1v or secured thereto. The conical pivots 10 are carried on lugs 11 projecting laterally from the bar 9 and threaded therein for adjustability and locked by set screws 11'. The lugs 11 embrace front and back walls of the base 1, and the adjacent end wall 1 of the base forms a stop for the bar 9 when the carriage is at the left end of its movement, as in Fig. l.

selmupnntwhich a drivingmotor zfiromsthezabove it will .betseen that thecarriage bracket 7umay.ibermanuallylswungback and fiorth across atheefor- -i-ward.edge:of. the-cupped grinding wheel 5 andtthat any abearingw-blockuori other piece of work clamped to :-.the 5 carriage .and projecting rearward beyondthe-jace of the wwheelvwill' .be groundioff ifsthe wheel is running;

T Tolhold such a.bearingrortother sirnilan piece ofhffwork .Jtintplaceon thecarriag a table plate.ILisprovidedJ QEhis nqalgteiis relativelyuthick and. accuratelyasurfacedLand rests lo t ratlitstr ear -.lowe'r1(margin on two finished lugs 13ipr ojecting -:slightly- \upwardafrom; the carriageahrackett 7 ,hand at: its g-forwardmarginon an adjusting or leveling-screw 1,4-and is -siastened downtby two capscrews=15 projecting .upwardly inthroughuthe bracket'Z and; screwed ifitozthreadedvholessfi' 15min the under sidetofi-the plate 12 only, whileifirmlyserewed '5 .iXltOiLthG upper, rear. margin ofwplate. 12,icen.trally thereof is a vertical rod '16 icoiledraboutwhichisa compression utspring 117 .bearing .againstrthe underxsideaofi. a clamping tiplatesls through whichtv-rod16. passes,.and. which plate l8 201;; iselcepta fromt-tturningtabout:sthearod 16sbyeanothenrod 22119 which, is,-scr.ewed ,into ai -corner.hholei119!vimplate: 12 a dprojects.upward;;through atmatching hole in clamptming plat ;rRod 16, istthreaded fromaits vuppernend: down a sufficient distance to permit the applicationetheretot-of ahlong .t-tubul aruthreaded wrenchdikeflmemberJt) vprovided fwi th a handleggl tortscrewingtdown against the elampingrplate to: once; it;t.d, owrrr andzxcl amp... a half beari'ngfi cap 0r m pck; .(a s indi catedat 22in Eig; )9, firmlytingplace against aoett e=-tah e;p1a ';12-

Ebe -gage which determinesthe-amount ltoabeaground e worl; comprises a pedestal; 23 tsecured touthe-ma ase- Z as by. a capi screw l l andion "top, of. which p K a: i1at;plate 25 adjustablybheld.iripositionuby 9341 gblgckz lfitweldedat,itsrearedge.ttottheiupper bowed tspringaarm -27 ,inttilrn welded Lat its Q pedestalnwhilea cap-sscreww28r passes aidswwarv v thrhhgh ahole in thezblq ezfiandttlirougli a sl ti-tfifi pla e-25, t -..S ;l1eW into.- the upper tend railhe 40 pedestal, thus providing for turning-tithes p1atetv=25 about the ge ieal axisp screw 8 randralso movingdhe-plate or: tfqlwardlycand clamping it 1 Q; 2. t blfldeubeingttaperedttowardithe w sh, -=1R ethlvprovided twithassuitable 1 "@5 l? @2s;f E:P $hi g: he:blfl e back andsforthwinjxthe ring a; ie infi 3 scribed; on theblade ttoltlany 1 9ml; @B 3 5. 2 fil scribedg'along ,thesedgesof tfi l in ufmmap a e @SL-in leontactiwithathe @d' fi blad itsbeingsunderstobdr-that l qazi 5 Mather Same angle; as t i t we-e ge ofethe qs slttt es-ferward qi i hith from and ettest-t9 -e a a l m tr a t assl st theorems 1. .pfith mbt t'li dflw i' Shaft. h i. t, We filottedzplate 11 w i easi t t a lz ed a a is formed with a Ugshapd gap or cut-pundit itsjorward edge-andspanning which gap are two fiat spring str1ps9, the opposite en ds of wliich are tightlypress ed iri't o slots formed in the forwardly extending horns or edges of the gap. These two flat springs are in line one directly above the blade 30 and the other below it and both extend at the same angle parallel to the tapered rear edge of the blade, while a small pin 40 projecting tightly through both sides of the blade slidably contacts the rear sides of both springs to thereby resiliently urge the tapered edge of the blade against the rear wall of the slot 31 as the blade is slid back and forth to any desired point along the scale 34. The scale graduations may be such that a longitudinal movement of the tapered gage blade one division will displace the forward or gaging edge of the blade, a thousandth of an inch, or 2 or 73 as may be desired. Therefore, if any bearing cap or other block be clamped to the carriage in position so that as the carriage is swung to grind a little off of it, then swung back to starting position in front of the gage, and the gage clamping screw 28 be released sufficiently to move the forward edge of the gage blade 30 into contact with the freshly ground surface of the block and locked in such adjusted position, the forward straight edge of the gage blade will be in absolute alignment with the grinding wheel, so that if the edge of the blade be moved rearwardly a trifle, say two one-thousandths of an inch by sliding the tapered blade to the right (in Fig. 7) one division of the scale 34, and any piece of work be laid on the table plate 12, moved into contact with the so adjusted blade, then clamped to the table and passed over the grinder, exactly that much will be faced off.

Wear on the face of the grinding wheel is compensated for by merely loosening screw 28 and moving the upper part of the gage structure including plate rearward and retightening the screw. For some kinds of work other than split bearings where the position for clamp screw 16 as shown would be in the way, the screw can be positioned anywhere else on table plate 12, or loose clamps can be used.

When worn or distorted connecting rod bearings have had the cap portion and the rod portion faced off as above described, they are bolted together again and of course the opening will be slightly elliptical, and they are then ground internally or honed to perfectly round form on this same machine by passing them over a forwardly extending expansible grinding mandrel 41, with the other end of the connecting rod supported on a forwardly projecting guide or stud shaft 42. This grinding mandrel is driven by the same motor 3 and may be thrown into and out of driving connection by a control handle 43. The specific details of this expansible mandrel is the subject of a copending patent application filed by me on date of December 20, 1952, Serial 327,076, now Patent No.

2,718,103, dated September 20, 1955.

Having thus described the preferred construction of my improved bearing grinding machine and the manner of its principal use, what I claim is:

1. In a grinding machine having a base with a grinding wheel rotatably mounted thereon, and a work table movable mounted thereon to move back and forth with one edge adjacent to and parallel to the grinding face of said wheel to carry a work article across said face for grinding off said article, and means for securing a work article on said table, the improvement which comprises an elongated gage for predeterming the position of a work article secured to said table, said gage mounted on a fixed portion of said base adjacent said edge of the table and provided with an elongated straight-edge extending along normally parallel with the movement of said edge of the table above and rearwardly thereof, and against which straight-edge the work article is aligned for securing to the table and may move therealong as the table is moved across the grinding whee], said straight edge comprising a blade tapered in width and slidably supported in a guide in a manner so that upon sliding the blade longitudinally its work contacting edge will be parallel to and recede or advance with respect to the grinding plane, and a scale designating the amount of displacement of the work contacting straight edge of said blade.

2. In a grinding machine of the character described including a rotatable grinding wheel and a work table movably mounted to carry a work article into the path of the wheel for grinding off a portion overhanging the table, a stationary gage for predetermining the amount to be ground off comprising a fiat elongated blade tapering in width toward one end, a supporting plate slotted to form a guiding seat for said blade with one long edge seated against the bottom of the slot, spring means urging edge of the blade to contact the bottom of the slot while permitting the blade to slide longitudinally in the slot, a finger grip provided on said blade for sliding the blade back and forth, a fixed scale carried by said plate along and adjacent one edge of the blade cooperating with designating indicia on the blade to indicate the movement of the blade when slid longitudinally, the outer long edge of said blade extending out of the guiding slot and forming a straight edge positioned adjacent said work table for contacting by a work article for positioning it on said table to predetermine the amount to be ground off of the article secured to said work table in contact with said straight edge.

3. In a structure as set out in claim 2, means for rigidly supporting the slotted plate while permitting its adjustment toward and from said work table.

4. In a structure as set out in claim 2, means for rigidly supporting the slotted plate while permitting its adjustment toward and from said worktable and also for angular adjustment with relation thereto.

5. In a grinding machine having a base with a grinding wheel rotatably mounted thereon, and a work table movably mounted thereon to move back and forth with one edge adjacent to and parallel to the grinding face of said wheel to carry a work article across said face for grinding off said article, and means for securing a work article on said table, the improvement which comprises an elongated gage for predetermining the position of a work article secured to said table, said gage including a pedestal rigidly secured to said base, a plate adjustably secured to the top of the pedestal, and a fiat tapered straight edged blade longitudinally slidable in a slot formed in the edge of the plate with one long edge seated against the bottom of the slot and the opposite edge extending freely adjacent the work article for contacting and aligning the work article against the straight edge of the blade when on said table in locating it thereon, the adjustability of said plate providing for movement of the plate bodily toward and away from said work article, and the tapered gage blade mounting effecting a parallel displacement of its free straight edge when the blade is slid longitudinally.

References Cited in the file of this patent UNITED STATES PATENTS 448,616 Hudson Mar. 17, 1891 630,536 Heald et al Aug. 8, 1899 740,263 Fisher Sept. 29, 1903 798,538 Stedman Aug. 29, 1905 2,032,538 Kulp et al Mar. 3, 1936 2,104,345 Holhut et a1. Jan. 4, 1938 2,151,528 Preston Mar. 21, 1939 2,598,055 Hogsfors May 27, 1952 FOREIGN PATENTS 22,562 Great Britain Oct. 10, 1896 455,814 Germany Feb. 10, 1928

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