US2466233A - Valve cutting tool - Google Patents

Description

April 5, 1949.

w. A. HARRIS, SR

VA VE CUTTING TOOL 2 Sheets-Sheet 1 Filed Aug. 22, 1945 /QQ 33 W lNVENTO R Wa frerz Ajlzrms Sr:

April 5, 1949. Q w. A. HARRIS, s R 2,466,233

VALVE CUTTING TOOL Filed Aug. 22, 1945 2 Sheets-Sheet 2T r'- '75 3/ 92 v 7*- r {I .ll]. '73

7o- INVENTOR '7 v Warren AJiar/wsSz' 80 '77 ATILORNEY Patented Apr. 5, 1949 ES PATEN OFFICE VALVE CUTTING: 'rooL Warren A. Harris,, Sn, Orange, Mass; assignor to The Leavitt Machine Company, Orange, Mass,

a corporation of Massachusetts Application August 22, 1945, ,Serial No. 611.997

. 2Claims. (01.29 105) My invention relatesto a cutting tool for a globe valve reseating machine, and more particularlyto one having adjustable cutting blocks. The general object of my invention is a new and improved cutting tool whereinvalve reseating is made more convenient, economical and effective. I

Further general objects of my invention are: an improved and simplified cutter block supporting bar; an improved cutter block; an improved arrangement whereby cutter blocks can be quickly assembled with anddisassembled from the supporting bar; an improved arrangement whereby adjustment of the cutter blocks relatively to each other and to the bar is facilitated; an improved arrangement for securing the cutter block's to the bar in any selected positionof adjustment; an improved arrangement whereby the cutting blocks may be secured. inreversed position; and an improved arrangement whereby the angular positions of the cutting edges with reference to the axis of rotation remains unchanged in all ad; justed positions thereof.

For the attainment of these objects and such objects as may hereinafter appear or be pointed out, I have illustrated embodiments of my invention in the drawings wherein:

Fig. 1 is a side elevational view of one embodiment;

Fig. 2 is a top plan view thereof;

Fig. 3 is a section taken on line 3 3 of Fig. 4 is a section taken on line 4-'+-4 of Fig. 3;

Figs. 5 and 6 are perspective views respectively of the base bar and of a'cutter block of Fig. 1;

Figs. 7 and 8 show twomanners in which the tool of Fig. 1 may be applied to the valve for the reseating operation;

Fig. 9 is a section similar to that of Fig. 3 through a second embodiment of my invention; and

Fig. 10 is a section similar to that of Fig. 4 taken on line ||l| of Fig. 9.

Upon reference-to Fig. 1, it will be pointed out that the tool comprises essentially the bar l0 and cutter carrying blocks l2 and I3. The bar ill (see Fig. is preferably an elongated solid piece of tool steel provided preferably symmetrically centrally of its length and width with a threaded socket l5 formed verticallytherethrough for receiving the reduced externally threaded end I! of the arbor or spindle of the-reseating machine. Supporting bar In is cylindrically-bored inwardly from its end walls 50 and 5| and to opposite sides of the socket |5 as shown at 2| and 22. These bores extend longitudinally and centrally Fig. 2;

of the width of the bar and terminate short of the socket 15 to close their inner ends at I9 and 20, and intersect the lower surface 26 of bar 10 to provide the longitudinally extending slots or openings 24 and 25. The bores 2| and 22 and the slots 24 and 25 are in. alignment longi- 'tudinally of the bar l0. Bar II] has its lower surface 26 providedwith serrations or teeth across its width to engage with the similarly serrated topsurface of the cutter blocks to which referenceywill shortly be made.

The cutter blocks 12 and I3 are duplicates of each other and the description of one will there'- fore suffice alsofor the other. The upper surface of cutter block of Fig. 6 is shown as provided with the centrally longitudinally extending channel or groove 32 to leave the longitudinally extended and relatively elevated surface portions 33 to each side thereof. These surface portions are serrated as'shown; for cooperation with thefiserrat'ed lower portions 26 on the bottom surface of thebar 10 of Fig. 5 in the manner shortly'to' be pointed out. The groove 32 on the upper surface of the cutter block is cut onthe same radius as are the bore portions 20 and 2| of the supporting bar l0 and preferably is substantiallyof ,thesame width as the width of slots '24 or "25 so thatwhen the cutter block l3 islassembled with the bar III with its serrated surface 133 fully engaged with theserrated surface 28 of the bar, the groove 32 and one of the bores 20 and 22 complete a cylindrical bore, the

major portion of which isin the bar ID of Fig. 5 andthe minor portionof which is in the cutter block '|3 .of.Fig.' 6.

I will now describe my arrangement whereby a set of two cutterfblocks l2 and I3 can be readily assembled with the bar I0 andv adjusted predeterminedly longitudinally thereof and locked in' that adjusted position. This arrangement comprises a roundopening formed vertically and centrally of and through each cutter block so that its lower end opens through the bottom of the block and its upper end opens through the groove 32 on the upper surface of the block. The upper portion 40,-of this opening is of less diameter than the lower portion 4| and is intended to receive therethrough the externally threadedshank 45 of a headed screw whose enlarged head 45 is received in the lower widened portion4| of this opening and thus countersunk into the block. The'screw is of a length so that when it is fully entered into the aforementioned opening in the cutter block, its shank 45 will project substan- 3 tially above and beyond the level of the top surface portions 33 of the block.

This arrangement comprises also a cylindrical pin 48 for each cutter block. Each pin is provided with a threaded opening 49 which is shown as passing diametrically therethrough, the diameter of the threaded opening being such that the shank'flS'of the aforementioned screw can he threaded thereinto and to this end the external lower surface of the head 46 of the screw may be' Fig. 6 shows the pin 48 assemhled 'wiurtne' cutter block l3 for and preparatory to assembling that cutter block of Fig."6"with'thebase bar It] to give a relation such as that shown in Figs. 1-4, inclusive. This assembly is effected as follw s: The cutter block I? of S l s 2 sembled with "the supporting barlll of Fig. 5 nereiy y entering'its pin into the open end .of bore 20 and'then adjusting it 'to a predetermined'position longitudinally of the bore. In this movement of the pin along the bore,it is "of coursefneeessary' thatthe shank' 45 ofits screw align with and enter the slot which extends lengthwise of the hole. In this movement, the shank or the screw cooperates with slot 24 on bar to maintain the approiiimate'parallelis'm between the adjacent surfaces of' the cutter block and the bar 10 and also holds the cutter-block to a rectilinear "movement longitudinally of the bar. The'cutter b'ldckl3 is locked in the position 130' which 'it has been adjusted l nelely by rotating thei'scr'ew in a direction'which 'will cause the 'cutterblock l3 to gradually approach bar'IB until theserrations or teeth 33 on the upper'surface ofthe cutter bar are imi 'engagea with thej'serrationsor teeth on the -'I0W er surface 26 on the bar '10. It will be observed viewing Fig; 4 which shows this lockedrelationship, that pin "48 is seated for its major part in bore of bar 1 0 "shar ens minor'pait' in groove 3201* the cutter *"'nle other cutter 1101601; 12 is assembl d" with i esut orting'bai Hi to giv'efthe showing-or Fig. 1 by entering its pin into the'open end of'bore 2 I attheiextr'eine right 'in Figs. Band Sfand then adjusting; the cutter' block 'IZ longitudinally along the bore towards the left and to the same extent as'thecutter block l3 wasmoved't'o the right and the assembly is completed by rotating its screw "to lock the bar I 0 and block l2 to each other.

It will be understood that the pin-4s of either cutter block can be entered into either bore and that the pins can beentered intotheselected bores to present the cutter blocksin either of'ftwo relative and reversed positions which are 180 apart in the horizontal plane and that both cutter of the cutter blOckslZ and I3 coin-prise sylnmetrically formed parallel teeth which extend across the width of 'thes'esurfaces and'whose sides are, angled at '45each.' As a result, a complete locking engagement is eifected regardless of'the with the supporting bar.

. "cutter liil'ock 'can""be" Fig. 7 shows the same adjusted relationship of the cutter blocks 12 and I3 as does Fig. 1. The cutter blocks are shown in spaced apart relation with their innermost ends at equal distances from the center of the supporting bar 10 lengthwise thereof, and this relationship can be predetermined and controlled as follows. Fig. 5 shows index markings -"on one side ll! of'bar Ill closely adjacent to the plane of engagement between the bar and the cutter blocks. This index, which is V a linear one, is marked for the size of the valve -seat which is to be ground or out. The indexing is duplicated and symmetrically positioned to op- 'pcsa siue of thecentral plane vertically across the width of-the cutter bar Ill. The predetermination of the adjusted position of the cutter 'blocks'is-efiected' merely by matching their innermost-ends to the same number on their respective indices.

The cutter blocks can be adjusted longitudinally pff'the her 'I 0""to an extreme outward position wherein 'the"screws' reach 'the ens walls 50 and iii of the ha'r l0" begin to clear slots- 24 and 2s. it'w ll be observed that the 'pin *48 of each I reversed without reversing the block that the enema-gs 4 9' diametrically through the pins are shown-in Figs. 3 and '6 "as'to f no side or theblanefdiametrically centrally of the pins, "fA'sare'sultthepins "48 can be saiidt'o have a longer end and a shorter end with reference to "that plane? and can beirevers'ed to "present "the "cutter ens-- outermost. This reversibilityfof the iilsfl relative-t their cutter tracks presents the advantage that when the blocks "are extend d considerably, the pins can be reversed fro'm their position fof Figs; 3 and 6'so that the en'ds elr inside "the "bars; whereas when the bilocks are notj so "extended, the (pins can take I ir o'sitionsofthese tterfhlo'cks {t2 an '13 are "each defined by races taan em-bein in t n "an l which is shown as45iriYFig "1 g or edge isprovided on'f't n'clin'ed ia'ce' o'f "each icutter mock so'that the cutting edge also presented at an a'n le'fof approximately 5 "to the horizontal. 'oponwiewingrig: 2' it "wilf'be observed that these"cutting"e'dges' ofthefivo "blhcksl 2 "and "l 3 are closely adjacent "to "the tertical plane longitudinally centrally throii'gli the bar I0.

, t e rc' jittei oloeksj' lziana' ls'are alsoeach pro- 'vi leu'at the tottomtnereof aiid'eloselyadiacent j't'o are orjthefs'ide f walls: orsaid block withthe oijfgatec"flatbr iidr'izontai'cttting ti s or ledges "6'5. This air bf "lioiiziir'itaf cutting edges '6'5 Tare 'diagonallyidnpo lte 's'i'iowri as"'pos'itiohed "bathe corners of. the bottom iace"oi"t'h cutter block "suiipornn ftar'jassembly.

"The 're'seating oitheangulafseat of a lobe valve increases the large diameter of that seat.

7"and8 ar'e tbshow how this reseating can he efiected so that the orig'inal'dimen- .sions "or this angular" seat are restored by-first fdo wn thtop -si-lifacelif the valve shown ar -1i- 3 dotted"lilies ltii which reference characters an Biareah Jlie-d'dfi-Eig. 7---arze--intended-to l'sho respectively the-annuIartop surface and t e ai ser ei iit ie W ae va vwhich reqiiires reseating. {The angularity of this seat llustrated in thedrawingsj as 45 consistent [wit the showing of the angularityofi the clitting manner in which the cutter block's arevassembled in Fig.;;1;. The cutteif blockswlland5L3 areshown-in Fig, Tasadj-usted-to approximately their position of Fig. 1 as called for by the size valve chosen for illustration in Fig. 7. In the illustrated position of the cutter bars, the pair of cutting edges 65 which are positioned horizontall to cut the topflat annular surface A, are presented in operative position for that purpose, whereas the other set of cutting edges 60 are inactive. When the tool is brought against the fiat top surface A of the valve and rotated, that surface will be ground down, for example, to the level A and the original height of the angled seat, as shown in dotted lines at B, will be reduced .to that shown in full lines in Fig. '7 at B.

. The cutter bars l2 and I3 are then reversed to their position of Fig. 8-to render cutter tips 65 inactive and bring the45 angled cutter edges 60 into operative relation to the angled seat of the valve whose heighthas been reduced by the first operation. The tool is then lowered to engage the angledseat portion 13' of reduced height and rotated to cut down the angled seat to the level shown at B in Fig. 8 thus restoring to the flat top surface and to the 45 angular seat, theoriginal relations and dimensions which these parts had before the reseating operation was started. The reseating of the angular seat after the fiat cutting is effected insures a tight fit by eliminating any burrs that may be left by the fiat cutters. It is the customary practice to use differently sized supporting bars for different ranges of valve seat sizes. The arrangement thus far described is convenient and economical in that it provides a means for cutting a wide range of valve seats and angles with a relatively small number of bars and assemblies. This is indicated by the fact that with this type of construction, only five bars with ten pairs of cutter blocks (two pairs for each bar) are needed for practically all the valve seat sizes and angles that are found in valves ranging from 2" to 12", whereas the same range formerly required more than 65 solid cutters.

It will be observed that the supporting bar has its upper surface clear of all projections or protuberances and that the socket l does not therefore require a raised hub to enable the spindle to clear projections or protuberances. It will also be observed that the bores 2| and 22 which extend approximately to the maximum length permitted by the presence of the central socket l5 can be employed for their full length' in adjusting the pins 48 because there are no elements which project downwardly from the bar to 'limit the effective length of the bore for purposes of cutter block adjustment. The length merely for the diameter of the central socket, the length of the bore to each side thereof and the thickness of the wall which separates bores 2| and 22 from socket l5.

Because the bar III has neither a hub or other projection extending upwardly from its upper surface, it can be made of regular cold rolled stock which requires only machining, whereas a hub necessitates that the bar be cast.

It will further be observed that my device comprises essentially only the supporting bar l0 characterized as above and the solid cutter blocks I2 and I3 and that merely a single screw is required to secure a cutter block in any of its adjusted positions.

The bores 2| and 22 are preferably drilled and of the bar can therefore be reduced to providereamed and the pins 48 are formed from round stock that is ground to proper diameter. The use of cylindrically ground pins and cylindrically bored channels cooperating therewith, possesses advantages which will be readily understood, .not only in the preliminary assembling of the parts and "adjusting the cutter blocks but also in the locking operation because the cylindrical surthrough each cutter block for the reception of .the screw, also centrally of its width but to one side of the already described opening. I have applied the reference characters 40' and 4| to two portions of this opening. The headed screws canbe entered into the alternative opening 40'- v4|" and the cylindrical pin 48 engaged by the screw in that position thereof. This allows of a further variation in range of adjustment of the cutter blocks which may be preferred for certain size machines. The central socket opening l5 preferably has its upper portion l5 enlarged and unthreaded and its uppermost portion 15 bevelled, to guide the arbor into its engagement with the threads which begin immediately therebelow.

Where the arbor or spindle of the tool is of relatively large diameter and requires acorrespondingly larger socket opening, I find it of advantage to machine the supporting arm [0 sufficiently wider however only at its middle, so as to permit of the larger socket Without, however,

correspondingly increasing the all over width of can be adjusted to proper engagement more readily and accurately and the cylindrical pins do not have to be driven through both faces of the cutters as would be the case where a single cylindrical pin is employed. As a result the cutting edges can be centered on the outer surfaces of the cutting block so that their radial adjustment will be not only longitudinal of the cutter but radially longitudinal of the cutter so that the angular relation of the cutters to each other is maintained constant; Another advantage ofthe illustrated arrangement is that while the cylindrical bores must be sufficiently long to permit the required adjustment of the cutter blocks, cylindrical pins can be relatively short.

In the embodiments of Figs. 1 to 8, the .cylindrical pins are carried by the cutter blocks and are adjustable therewith longitudinally of the supporting bar ID. The embodiment of these figures can therefore be characterized as the adjustable pin type. I will now describe the alternative embodiment of Figs. 9 and 10 wherein the cylindrical pins are not adjustable with the cutter blocks and which therefore can be characterized as the fixed pin type. Upon referring to Figs. 9 and. 10, it will be observed that the cylindrical pins H! are each carried by the supporting bar H by means such as a headed screw which is engaged through an opening which is provided vertically through the bar 1 I, with the head 13 of the screw seated in the upper enlarged end of the opening in countersunk relation to the bar. The threaded shank 16 of each of the two screws extends out- 7 through-.amcylindrical: pin'l1ll. .;Both=.screwsxare 'ireeworotateginithe bar 'I-Land' when rotated each will raise "or :lower :itsipin :10.

;The nutter blocks 80:.and' 8|, are. each: bored tciszlindricallyas shownat '83.:and Mite freely-receiye pins flfltithexboresabeingz .located -.howe.ver entirely within the cutter blocks and extending longitudinally centrally thereof. These. bores are :openat oneend through the vertical end -faces 86- bf the cutter -blocks and-their other ends terminate short of and are closed bythe endwa'lls BLwhoseouter face is inclined as shown at 88.

The cutter blocks are each provideduwith longiltudin'ally extendingvertical slots 15 each of a :width slightlygreater than the width of the shanks -16 .of the screw with-which it cooperates and -zof alength to be at least co-terminouswith thebore. Each slot 15 is open ithrough the top surface 'of its cutter block and intersects the :bore oi-that block for the full widthof the slot.

The embodiment of Figs-9 and lflmay con- =fiorm structurally to the-characteristics of the embodiments of Figs. into 8, except as to the differences already pointed out and the further differences now to be pointedout. For example, the enga'ging surfaces of bar 1! and cutter-blocks -83 and 8| aretoothed (see' 90 and 91) the bar .'H has counterbored socket 92 provided centrally thereof the cutter blocks are providedwithcutting edges '94 for grindingthe flat surfaces, all substantially asset forth in the embodimentof "Figs. l-to 8,'*inclusive.

' The cutter blocks of the alternative embodiment are each assembled with the :bar by aligning the open :end '01" its bore 33 01184. with a .pin 10 and its slot with shank 1B of the cooperatzingheaded screw and then .moving the cutter ibl'ockinwardly along its, cylindricalpin :which is :fixed to supporting bar: N. This requires that -ciently to prevent. interference withuthe adjust- :ment of:..the .cutterblock, by teeth' 90. and 19!. .This clearance :can be provided by mtatingfithe .zappropriate screw. Otherwise the preliminary assembling of the cutter blocks and theiradjustatent. to .the same .predeterminingxpositions is.:as

radiallsalignment with each other :a-nd: the .center 11 -nfrthe socket l5 and maintain that :relationrin .zall adjusted positions "of the cutter blocks.

The details cfnonstruction herein set:.forth;,are intended merely. .for purposes. :of'. disclosure (of specific-applications of my invention, :and .are givenzin zcompliance withthe:recmirements of :the statutes. .a-They. are-notintended :as. limitative unless-called for-in the ;claims. 150 also the i45 .sangularity -.of :the cutter tips Z60 zisrintendedeas 8 merely; illustrative, reference.havingalreadytbeen made. tothevfact that sets: of cuttenblocks will .provide for difiering rangein sizes. .and,also for other angularities ingthe. valve seat.

What I claim as newand...desire. tosecure by Letters Patentis:

..1. -In a device for cutting the tapered vseatscf globe valves, in combination, a mounting bar .of prismatic shape havinga central tappedsocket .for attachment, the saidv mounting hair-being machined from bar stock, :the undersideof the mounting bar presentingiawpluralityi citrans- :versely directed, equidistanced: serrations, .a;1pair iof *cuttere-narriers, .likewise- .machinedj.:frombar 'stoclg; the-.npper. surfaces: itl'lelieflfi r-vrrsenting 1 a :plnrality-,of;transverse serrationszfittin said serrations of'the-lmountine :bar,.;-s.'a-id;-:mountine; bar aha-ring apair; oizzcyiindrical: bores extending in- .wardiy ifmm: sea-ch end :theneofsthecenter f said cylinders: being: distanced from. the: underside .of thebar somewhat lessthan the radius,.;0,f :the cylinder, so that a nainpf:longitudinal-slots are ciormed in said underside pi the; mounting a r-pai 0f;:;cylindnie a1 plu s..si da 1e-invsaid: ores and-inserted. theneimfmm the said-lends th reo v n a tapped hole throu hsthedmmeterlthereof-, the said cutter earnersh v ne; a hole wit a enlar ed pp n ne a Pthe underside .oithe carri rs, headed screws --insented in sa d holes with their head received in :sa-id en a ed p n g thereo the -ends. of said screws cleari ei it-he sa d :l neitudinal slotsin therunder de of, the: mount n air and tlmea-dedinto lsaid. t nned holes-pf th cylindrical plugs.

'2- The d vice-:aqco ing,to claim :1-; =w e .ei one end .of said. gpairtof' -,c utt,er carriers are beveled a ;p ovided with-.cu t -ne ed es; andnwhenein .the underside ,aof (said carriersare proy-i led-With cutt n ed es close to, {the other ends thereof, 'said pair of carriers beingselectively:positioned in underlying relation to the mounting harwith thei sa d-b v ed tin ed es =i cine l one.,.ancthenand with their sa nde sid eutti e ed es di ally is osed to c t in the. amen-mace 5. 45 ofisaid-rg-lobe valveseat, gand-saidp 1r of carriers b es' nrile o edwith tneirlsaid ereledcutrising edges di a y idisposed for euttine ..-t;h.e

{tapered sides -.of said tvalveseat.

- -,WARREN--.A---.HARB I ..J 1S3- REFERENCES CITED UN TED' STAIEWSLRATENTS j-timber a Name Date at 4.153.898 Cummings 4. Aug. 18, 1 1891 89.2;894 Roman J'July .7; 1908 1,071,479 Strudwick ,Aug". 26, 11913 41285155 .Lackey ".'F'6b.1i9,' 1915 .1,-,Z81;499 .Broadbooksn -Oct: 15, ;1918 1415645806 Betterley Arm-1'3, 1928 ..il; 68,3.62 @West =1July :31, --'1934 2,350,019 Dexter May;30,;1'9.44

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