US1009877A - Apparatus for grinding blades. - Google Patents

Description

R, T. WINN. APPARATUS FOR GRINDING BLDS.

APPLGATION FILED 13150.22, 1910, 1,009,877@ Patented Nov. .28, WH.

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EETS- T, WINE. APPARATUS FOR G-RINDING- BLDBS.

3 BHEETS-SHEBT 2.

\ R. T. WINN. APPARATUS PGR GRINDING BLADES. APPLICATION FILED DEG. 22, 1910.

31 ujwgw Patented Nev. 28, 1911.

3 SHEETS-SHEET 3.

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RICHARD ".ttl. WINN, QF CLFTONDALE, MASSACHUSETTS,

FACTRING COMPANY, OF BOSTON, MASSACHUSETTS,

asstonon 'ro tnsttn latenti a oonrona'rron or Maasai..

Specification ofLette-rs Patent. lpgrtmrtgd NGV. FIS, 1911,.

CHUSETTE.

APPARATUS FOR GRINVDING BLADES.

neonata.'

Application filed December 22, 1910. Serial No. 598,843.

To all whom 'it may concern: l

le, it known that I. Riemann T. lliixx. a citizen ot the United States, and resident l oi tllilitondale, county ot' Essex, Statefrtl 'Cit Massachusetts, have invented an ln1provement in Apparatus tor Grinding Blades, ot which the l'ollowingr descrilition, in eonneetion with the aeeompanying drawing. is a specification, like letters on the drawingi representing' likeparts. This invention has for its objectl the produetion ot" apparatus particularly adapted tor grinding with rapidity1 and itiieiency safety-razor blades made ot' thin plate metal and which must be accurately `ground on oppostte sides to secure the desired cuttingd @da ln `my present invention the blade to be `ground is clamped in a sel'l-centeri'nel bladeholder and one side ot the blade is sub-`1 jected to the action ol a rotatingr and elongated grinder. a relative movtanent o'l the blade and grinder axially beiner ell'ectedl automatically so that the length ot the. grinder is t 'aversed by the blade, and at the end ot the traverse the blade is removed autonm-titailly t'rom contact with the grinder and the traverse movement is stopped automatieally. The operator thereupon returns the parts to startingr position. reverses the l blade-holder to present the other side ot the l l blade, to th\ aetion otE the grinder. and the presentation ot the. blade to the Agrindery e'tiieets simultaneously the starting ollv thel traverse. ln order to seeureia very uub form and even grinding action the lgrinder is constructed in a peouliar manner, to be deseribed, with other novel 'leatures ol the l, invention, in the subjoined specification and mirtioularly pointed ont in the followingl claims, and it will be apparent hereinafter l that certain 'Features ot the invention arel adapted for grinding variouskimlsol' blades. l Figure l is a top plan View ol a lgrindingr apparatus embodying my invention. with!` the parts in operative position aml ready to l begin the 2grinding` ot a blade: Fifi. l is a l 'front ele f'atiou ot the. apparatus shown in i Fig'. l Fifi'. B is an enlarged transverse seci tional ,v-iew taken ou the line iwl, ltig'. 2. l .lookinfg' toward the lett; Fin. -l is a similar 'viewplalso enlarged. but with the earrier tor the bladediolder swunp; baek to ino )erative position and disconnected :troni t-lie feedl removed from its Carr i sections mechanism, the blade holder having been r; F 1g. 5 .ist a longitudinal section ot the grinder, the shaft or arbor therefor being shown in elevation;

ltg. bis an enlarged top plan View of the blade-holder with a blade clamped therein; Fig. 7 is a partial sectional view thereof taken on the line 7--7, Fig. ('3; Fig. 8 is an enlarged cross-section of.' a blade after it has been ground; Fig. 9 is a detail, prin eipally in section, of the yielding and adju'stable part of the connect-ion between the rockiitg carrier and the' follower, to be rejlerred to hereinafter.

The working parte' ot the apparatus are sustained by parallel and upright end trames l, l, having' each a broad, flat foot 2 in praetiee bolted at 3 to a bench, table or other suitable support Ll. rlhe rear portions ot' said trames are provided near their npper ends with like bearing boxes 5 having detathableeaps G, in which boxes are ro ta tably mounted the journals 7 otl a grinder sha'lt. S, shown separately in Fig. 5, the shatt preferably being' somewhat larger in diameter than the journals. as Shown. At one ond said Sha'l't has a {iXed annular en largement or shoulder 9 and the other end el thesha'ttis threaded at l()` :tor the reception ot' a clamping` eollar Ztl, and between the shoulder and eollar a series of circular disks or anuuli 1Q o't' abrasive material are strun; v in axial alinement side by side., to present a continuous elongated grinding iair'taee. 'l`he grinder herein shown is thus ia de up o'lia pluralit'y o-'l relatively narrow or menilnrs, all oi"-` wbieh are elauxped serurely to each other and to the shatt tl between the shoulder t) and Collar 11 when' the latter is set up tightly.

ln practice l ha ve, Yfound that it is praotieally impossible to provide a single section grinder ot' any material length withoutnumereais hard spots disposed at irregular intervals. and such hard spot-s result in an imperfect and irregular grinding action. This is particularly objectionable in grind ing small and thin blades, sut-.h as safetyravlor blades, which require a. very uniform grinding to secure the best results. l have Afound. however, that by making the grinder ot a series of annular sections or disks, relaf tivel narrow. and damping them. together side by side, eeeure very great urti pulley formity of grinding action7 the liarespnts in the abrasive material being reduced te a nuniinuin, Aand it is also very inueh less expensive te Inale the narrow disks accurately :ind uniform than to attempt the nninutlieture et e long., single section ginder. annuli are niade of any suitable abrasive materiel, such ns Carborunduni7 cerunduin,

or the like, and l prefer te maire the un' nnli at one end ol" the series eenienfliat than these. e the opposite end, in

' initial or rough grinding may by the coareer nieterilil. in Figs. be noted that the nnnuli rght hand end of the grinder are onsiderulily n* der than these indicated by the iinishing end et the grinder e -d es they are inede er' the finer abrasive imiteriel ei belt, notshown) applied 'te a le-, 'l nd 2, aitaclied te ene or the Jeurnals Y projecting beyond. its beering feos siiewn et the rieht hand end of the apparatus, the particular inode ot al,-

tfzielnnenty er the pulley 'to the shaft being et ne meurent so far as concerns niy present inventien.

Below the grinder e preferably nietalbox.

ortanl i6 is supported between the end ,trani-es l.. said bei; having its front side 16 Carried up ebore the axial center oi' the i nt rezirnf'ard a' lli' te forni f if i., edge ei' which closely ap rindi .g surface. but leaving the saine enne-sed abeve and behind the shield. fr lioiizentai i8 through bei: '5 below the shield in front eff the rinder and is prerided on its rear side with .eriee oit pertoretions. as i9, igs. 3 and i Cireet Water or other liquid upon the r, V sliield'i protecting ell parts :appui-ziens in freut of me grinder from A y e et liquiddireeted iipen the grinder irren pe' .icles on grit, metal and dirt7 Trore` during the grinding, vthe reeeiving the Waste Water is supplied 'lie pipe Source. nel', slim-fn. At e fre-mes are provid d with The grinder is rotated speed the axes of the bearings 2l being parallel to .the ei' rotation et" the grinder shalt S.

l feedfsrrei'v is rotatably mounted in the bearings 22 and is held from endwise morenient by suitable collars 2st. rigs. l and 2, ene end ei' seid feed-screw beingextended, as at. i5. to receive a pulley`` 2li by which the feed-screw is continuously at desired speed threugh a suitable belt or band (not shown). A long shaft er rod 27 is .mounted relatively in the bearings 2l and it is also movable longitudinally therein, ity having a longitudinal movement er traverse substantially eqn-.il to the length of the grinder. Step Collars QS'adjustably held on the rockshntt 2? by suitable Set-screws 29 between the hee-.rings 2l limit the longitudinal nieveinent of the shut, as will be apparent from en inspeetieii et' Figs. l and 2. A cranl erin-30 ixedly attached to the left hand end or' the rock-shaft, as herein shown. is provided with a headed stud 3l en which are hungl and pvotally suspended gne or more' weights each weight having a key-hole slety Figs. 3 and 4, by .means ot which the iveight can be applied to or removed frein the sind. 'i'l'xe weights swing" freely from (the stud und :is they :ire eccenrie to tbe roelr-shuit they tend to maintain it turned inward nr away from the grinder, :ie-

cordiug te uli-ether the arni 30 is extended toward or eway ironi the grinder, :ind when in the 'former pesition-the Weight carried by said urni operates to press the blade tobe greund against the surfaee of! the grinder, as shown in 4`ig..3. Byfincreasing or decreasing the number of Weights the pressure to which the blade is subjected can be varied :is muy be necessary.

TheA ineens for holding the binde to be ground, and for connecting it with the rock shaft 27, Wit-h the ineens for controlling and eli'ecting nio'reinent f the letter by the feed screw will' noi' be described.

A carrier' is herein shown :is :i longitudinally split arm 34C extended radially from the roclr-sliaf 2T and provided with a bifurcated hub through -which the shaft extends, set-screws 36 Serving to rigidly/attach the hub and shaft to move as e unit, The carrier has an upturned handle BZhy means of which said carrier end attached shaft een be turned toward or from the grinder or moved le'ingitudinally in parellelismftherewith. The splity rear end of the Carrier has a radial cylindrical recess 38 to receive the tubular she.nlr39, see dotted lines Figs. 3 and of a block '40 depending below theA carrier and carrying on its rontward face e' roll ill., for purpose to be described. A

screw ll-Q"` serves te clamp 'the split ends of I the ernrier securely upon the sluink 39, thereby neldi'ng lelie shank end block l0 rigidly- 'enlarged to form a tubular boss 63, having its bore internally enlarged at 6e, Fig. 9, and threaded to receive an adjusting screw Gieounterbored at, its inner end at 6G. .A

plunger (57 is slidabl f mounted in and r0- .t c: d

jects from the rear end of the boss 63 and has an attached stem 68 which passes through the adjusting screw 65, a collar 69 being pinned to the outer end of the stemt Between the plunger 67 and the bottom of the counterbore (i6 is inserted a spiral spring w 70 coiledfaround the stem of the plunger and'ten-ding always to project the plunger, such tendency being restricted by they collar 69,"as in Fig, 4. Upon the underside of the rocking carrier 34 I form an abutment 7l which engages said plungerA when the carrier is swung into operativen position, as in 'l Fig. 3, the pressure of the weights 32 being' vtransmitted through the rock-shaft 27 and carrier abutment to the plunger', compressthe feed-screw 23.

ing the spring and forcing the follower 60 forward into operative engagement with rl`hus while there is a positive pressure exerted by the :weights 32 to hold the blade 46 against the grinder during the traverse of the blade effected automatically by cooperation of the rotating feed-screw with the follower the said follower and feed-screw will he held yieldingly in engagement through the spring 7 O, giving .the threads on said parts an opportunity to readily and easily inter-mesh when the follower is moved to operative position.

rlhe carrier, the blade-holder, and the rockshaft 27 are fed bodily lengthwise of the grinder by the feeding means, so that the blade is caused to traverse the surface of the rotating grinder from its left hand end, Figs. 1 and 2, to 'itsv rightl hand end, to grind one of the bevels on the edge of the blade. When suchA traverse is completed the blade is disengaged automatically from the grinder, and this is effected by a camV 72 .bolted to the right hand frame 1, Figs.`1

and 2, and extended in the path of the roll y el on the carrier block 40, said roll traveling up the inclined face of the cam and swinging the carrier upward.y As the carrier isV thus raised the abutment 71 is retracted from the plunger and the spring 70 expands, while the counterweight 62 is free to act and swings the'follower arm ,59 rearward, disengaging the follower GO from the feedscrew By the automatic disengagement of the carrier from the feeding means when the grinding traverse is completed' the blade sustaining instrumentality is brought to rest, andY while the grinder and the feed-screw continue to rotate they will not perform any work, so that an attendant can lool: after a l number of machines, going from v'one to another. When the grinding traverse of the blade `is completed as described the attendant l grasps the handle 37 and swings the carrier Locas?? and connected parts into the position shown in Fig. 4, the edge 73 of the carrier hubengaging the top of the extension 61 and mving the follower arm 59 back against' ahorizontal stop rod 74 fiXedly attached at its ends to the end frames `1. Now the rockshaft 27 can be moved manually to the left,

sliding in its bearings 21 and carrying with' it the various parts connected therewith until the lefthand stop collar 28 engages the left hand bearing 21, Figs. 1 and 2, the carrier 34- now being in the proper place longitudinally of the grinder to begin another grinding traverse. Bnring the manually effected return traverse just describedthe lstop rod 74 serves also as a guide and the weights 32 maintain'the carrier and connected parts in lthe relative position shown in Fig. 4l. Be-

`with is suicient to form the bevels 75, 76,

Fig. 8,011 the opposite sides of the blade,

but`if necessary the grinding traverse'for either' or both sides of a blade can befreeated as often as required. When a blade nas been ground the attendant removes the"- blade-holder from the vcarrier and inserts another having Van unground blade, and the operation is continued with all of the maohines of the group of which theattendant has charge.

By constant use the grinder wears and thus decreases in diameter,l permitting the carrier to approach the axis of rotatio-in 0f the grinder by small amounts, and this re- Aquires vadjustment at times of the plunger spring 7 O, such adjustment being effected' by turning the screw G5 into or out of the boss (S3, to increase or decrease the tension of the spring as may be necessary. When'the stem ,48 has been adjusted in the head of the gblade-holder so that the annular groove 50 is at a. certain distance from the edge of the- ,blade when clamped in the holder the latter may'be used not only in the grinding opera; tion, but in finishing operations carried out by other apparatus, and it is notnecessary to disturb such adjustment of the stem when the diameter of the-grinder diminishes by use.

By temporarily loosening t-he clamping screwflQx the shank of the block 40 can bel adjusted radially in the carrier 34 so that when the stein is inserted in the seat 43 the edge of a blade in the holder will be applied liti what l claim as new and desire to seen re hy Letters Patent, is:

fl. .ln apparatus oit the elassdeaeriheit an elongated, rotating' grinder. a rotating; 'feedn Screw parallel thereto. a roeli ne carrier haw ing; a follower pivotally eonneeted there with and adapted to eooperate with said feed-gerenT and etteet 'feed ot' the carrier in one direetion longitudinally et the 4grinder. means to support and permit roeltina and long itudina]y movement of the'l carrier. a bladeholde,t mounted on the carrier and adapted to' present a blade to the grinder when the ivtollower is in Cooperation with the t'eed screw', and ineana to `.Carvingw the tollowi-r away from the feed-screw when longitudi- .i I

nal teedfol the Carrier has heen emnpleted.

2. ,ln apparatus ot the class deeerihed, an elongated. rotating grinder. a, rotating' 'leedscrew parallel thereto` a roeltinfi` earrier han ing a follower adapted to eoiiperate with said feed-serew and etteet 'leed of the earrier longitudinally ot' the lminder` means to supportil and permit rocking and longitudinal mmfementI oit' the carrier. and a hlade-holdm mounted on the earrier and adapted to presen/t a blade to the grinder when the tol lower is in cooperation with the 'teet'l-serew. Combined- `with means to roel( the earrier a nd disengan'e the tollower 'troni the t'eed-serew and also retraet the blade-holder Atrom the grinder when Va predeterinined longljitudinal feed o'l said earrier haisy heen et'lleted.

il. In apparatus ot' the elass deserihed. an elongated rotating` grrindm"` a carrier inou.;

ahle longitudinally ot' and parallel to the `trrinder and adapted to he rocked toward and from it. a hlade-holder` a detaeluihle and Self-centering; eonneetion hetlween it and the earrien means to etleet longitudinal more ment ot the ea rrier and cause a blade in the blade-holder to traverse the grinder. and ineane to eo-nneet said teedino; n'ieans and the Carrier when the latter is moved toward the Yerinder to operatively position the blade`- holder with relation to the `ifrindw'.

ll. ln apparatus ot the dass ileserilied. an elongated rotating lgrinder. a rtnatintf tendu screw parallel thereto. a roeltinn` earrier haying a follower adapted to eoiiperate with said 'leed-Heren' and etl'eet t'eer nl the earrier longitudinally ot' the e'rinder. means to sul port; and permit rocking and longitudinal movement ot the carrier.y a pivotal eonneetion hetween the carrier and li'ollower, yielding.;I means aeted upon hy said carrier when in operative position to maintain :aid tollower in engagement with the tee(l-sereitirg to thereby etleet longitudinal feed et the earriern a deyiee to dise'nialle the jt'ollnwer and teed-Serew when the carrier is roelied trom operative position, and a blade-holder mounted on the carrier, to hold and present the lside et a blade to the action o'I the grinder.

ti. ln apparatus ot the elass described, an elongfated, rotating' grinder. a longitlulinallv movable roeleshat't supported in parallelism with the grinder, a oarrier radiallyY extended troni and rigidly attaelled to eaid roeleshatt' and movable toward and from the grinder, a 'rotating' feed-screw parallel to said roeksha'tt.y a follower pivotallyhung on the latter hut movable longitudinalliT therewith. a weight to disengage'the follower from the 'teetl-aeiew. means mounted on the carrier to suatain a. blade and present the side thereof' to the `grinder, and meins g'oy'ferned hy the carrier to yieldingrly maintain the'tollo'wer iin eiuiaejement with the feed-screw when Said earrier is in operative position.

G. ln apparatus of the. Class described, an elongated, rotating grinder. a longitudinally mov: tile rook-shaft supported in parallelism with the grinder. a carrier radially extended from said roek-shaliti and having: a loi'lurlated huh einliraeing and rigidly attached 'to Said shalt. a. dependingn follower pivotally mounted on the rook-shaft het-Ween the tureations ot' the carrier huh. a rotating" teedsereivparallel to the roelr-shattand adapted l to cooperate with the follower to e'tteet feed ot the shat't and carrierlongitudinally ot the grinder, yieldinga means to maintain eooperat-ion ot' eaid 'follower and iteed-Serew when the carrier is opeiatively positioned, and an oppositelyatetinnj device to disen rage said 'follower and teedeerew when the carrier is roelted to inoperative position.

"7. "the eomhination with a rotating;1 grinder, a` lolade-.sustaining;r instrumentality movable toward and troni the grinder and also longitudinally thereof` and a, rotating 'teetserew parallel to the grinderof a tot lower operatively connected with the loladeauslainine; inatriimentality. and means to etlieet eoperation ot the follower and 'teed serew hy movement. ot `aaid inatruinentality to operative position and to disengaege the tollower and toed-screw when eaid instrumentality is :moved to inoperative position.

tl. 'llie etmiliination with a rotating :Ii-iinler. a iliade-sueltaining instrumentality moralile toward and from 'the ,fgrinder and talso longritiulinally thereof. and a eontinuouali" rotatingl ili-iedsinember to etteet such lomritudinal movement, ot means rendered Cn i active by movement of said instrumentality to operative position to cause the feed member to move said instrumentality longitudinally or" the grinder, and a device to render said means inactive when said instrumentality has been moved longitudinally a. predetermined distance.

9. The combination With an elongated, rotating grinder, of a carrier adapted to be rocked toward and from the grinder and also to be -moved bodily longitudinally thereoa blade-holder mounted on the carriera continuously moving member to eitfect such bodily longitudinal movement of the. carrier in one direction, and means'to connect or disconnect said carrier and continuously moving member by movement lof the carrier toward or from the grinder, re' spectively.

l0. The-combination with an elongated, rotating grinder, of a carrier adapted to be rocked toward and from the grinder and also to be moved bodily longitudinally thereof, a blade-holder mounted on the car- I riet', a continuously moving member to eect such bodily longitudinal movement of the `carrier in one direction, means to connect or disconnect said carrier and continuously moving member by movement of the carrier vtoward or from the grinder, respectively, and a device to ettect automatically more` ment yof the carrier away from the grinder when. a blade in the holder has been moved along the grinder Jfrom one to other end thereof.

ll. The combination, With an elongated, rotating grinder, and a rock-shaft parallel thereto and manually movable longitudinally in one direction, of means to move said rock-shaft automatically in the opposite direction, a device to rock said sh 't't and disconnect it from said means at the end such automatic movement, a seltcentering blade-holder connected with said rock-shaft 'to rock and move longitudinally in unison therewith, and acting through the rockshaft to press a blade in said holder against the grinder during automatic longitudinal movement of theYrock-shatt.

12. The combination, with an elongated,

` rotating grinder, .and a roclrshaft parallel thereto and manually movable longitudinally in one direction, of means to move said rock-shaft automatically in the oppoite direction, a device to rock said shaft and disconnect it from said means at the end of such automatic movement, a self-center ing blade-holder connected with said rockshaft to rock and move longitudinally in unison therewith, and a Weight connected eccentrically With the rock-shaft, tending to turn it in one direction and press a blade in the holder against the grinder during auto'- matic longitudinal movement of said rolshaft, and to retain the rock-shaft in in to swing said blade-holder awry from trie grinder. i

,13. The cfnnbination, with an elongated rotating grinder, and a rock-shaft parallel thereto and manually movable longitudinally in one direction, of a rotating leed screw parallel to the rock-shaft, a follower connected with sa-id\shaittand adapted to coperate with the feed-seien7 and move the rock-shaft longitudinally ,opposite manual movement thereoi when said shaft is rocked toward the grinder, a self-centering blade-holder detachably connected with the shaft, to rock and move longitudinally therewith, means to press a blade in the holderl againstthe grinder when the tollower and feed-screw are in engagement, and a device to turn said roch-shaft away from the grinder and perniit disengagement of the follower and feed-serein.7 when vthe l u r y retract the blade-holder trom the grinder holder.

l5. llic comlfination, with an elon rotating grinder presenting a cyliin 'irzf surface, of a carrier, means to l rudinally ot the grinder, seit i move it lou`` centering blade-bolder mei'inted on si rior, and a device to nove autoniatiiallv air i lul neon-ely thy carrier ing means at a i)redeermined point in the longitudinal movemen; oit said Qll'l'lQl'.

lll. the eiaiibinzititiii, with an elongatet'i, rol nine' grirder presenting a continuons c vlindrical sur .y of a self-centering bolder, a carrier on which it is etacha mounted fixed supports, a recit-shaft me ed therein parallel 'to the grinder and movcarrier and roclr-sliattbeing rigidly connected, means to eliect longitudinal feed of said parts when the carrier is in operative ,eosition` to cause ahiade in the holder to traverse the grinder from end to end; and means acting 'through the roch-shaft to press the blade against the rinder during such traverse. I y

i7. The combination vvitn a rotating and elongated grinder, of a' rotating feed-seres' parallel thereto, a rockingcarrier movable operative position when turned manuillyv blade has been moved from one to the other-v and stop the longitudinal feed ot' said blacen holder into able lougitudinallv in said supports, said toward and from said grinder and also longitudinally thereof, a blade-holder mounted on the carrier, and means governed by movement ,of the carrier toward or from thegrinder to operatively connect or disconnect, respectively, said carrier and feed-screw to move the former in one directionlongitudinally oit the grinder. f

1S. The combination with a rotating and elongated grinder, of a rocking carrier having a radial seat, a bladesholder having a stem to enter and rock in the seat, a detent to retain said stem in the seatwhile permitting rotative movement ot' the seat, a longitudinally movable rock-shaft parallel to the grinder and with which. shaft said carrier is iixedly connected, continuously operating means adapted to etl'ect longitudinal movement ot' said rock-shaft in'one direc* tion, and a device to disconnect aut-ornati cally said rock-shaft, and feeding means at a predetermined point in the longitudinal movement of the shaft, rocking of the latter manually toward the grinder effecting cooperation between said shaft and the feeding,l means.

19. in apparatus oi the class described, a rotating Lgrinder, a' rotating feed-screw and longitudinally-movable rock-shaft, bot-h parallel to the` grinder, a radially extended carrier ixed on the rock-shaft, a bladeholder monnted on the carrier, a counterweighted arm. movable with and rotatively mounted upon the rock-shaft and provided with a follower to coperate with said feed screw, to etlect longitudinal movement ot" the rock-sha ft and its adjnncts, a spring-plunger on the arm, an abutment on the` carrier to engage the phmger and through it maintain the follower in engagement with the feedscrew only when the carrier is operatively positioned, and a weight connected eccentri- 'ally with the rock-shaft to act through it and maintain a blade in the holder pressed against the grinder when said carrier is operatively positioned.

Q0. ln apparatus oi the class described, a rotating-,r elongated grinder, a rock-shaft parallel thereto, fixed bearings in which the sha 't't can rock and be moved longitmlinally a distance equal to the length of the grinder, a seli'centering bladedlolder detachably connected with the roclosha'ft, the latter being movable manually in one direction loir gitudinally ot the grinder, means to etl'cel, :mtomatically longitudinal movement of the rock-shaft in the opposite direction, and Val transmitting connection between said means and the rock-shaft, said vconnection being rendered inoperative by rocking movement of the shaft to retract the blade-holder from the grinder.

21. The combination with an elongated, rotating grinder, a trough beneath it, a shield on said trough closely approaching the grinder at one side thereof, and means within the shield to direct a liquid upon the grinder, of a rocking and longitudinally movable carrier located at the shielded side of the grinder, a bladeholder mounted on the carrier and adapted to present a blade to the grinder above the shield, a feed-screw parallel to the grinder between the shielded side thereof and the Apath of movement of the carrier, and means to operatively connect said carrier `and feed-screw to effect feed of the carrier longitudinally of the grinder when the carrier is rocked to operatively position the bladehold`er.

22. In apparatus of the class described, a

rocking carrier having a radial .seat and a tubular boss ati the outer end thereof, a blade-l'iolder having a stem to enter and be supported rotatively in the seat, and a recessed nut on the stem to closely surround the boss and prevent the entrance of foreign matter to the seat. lin apparatus of the class described, a blade-holder having fixed and movable clamping members to clamp between them a blade to be ground, a supporting stem extended from the fixed clamping member and, longitudinally adjustable therein, and means to lock the stem in adjusted position.

24. In apparatus of the class described, a blade-holder having fixed and movable clamping members to clamp between them a blade lto be ground,` a supporting stem eX- tended from the fixed clamping member and screwed into the head of said member for longitudinal adjustment, a checlonut to lock the sten; when adjusted, and a rocking carrier having a radial seatin which the stem ot' the blade-holder is rotatively mounted.

ln testimony whereof, I have signed my .name to this specification, in the presence of two subseribin witnesses.

RICHARD .T. VVINN. lillitnesses:

JonN C. EDWARDS, THOMAS d. DRUMMOND.

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