US1816171A - Valve grinder - Google Patents

Description

C. BOOTH July 28, 1931.

VALVE GRINDER Filed April 12. 1929 4 Sheets-Sheet 1 July 28, 1931. c. BOOTH 1,816,1.71

VALVE GRI NDER Filed April 12, 1929 4 Sheets-Sheet 3 lge@ mi C. BOOTH July 28, 1931.

VALVE GRINDER Filed April 12. 1929 4 Sheets-Sheet 4 gwuefntoz fMG/miaar/f lPatented July 1931 AUNITED STATESJ PATENT OFFICE CLEMENT BOOTH, OE CINCINNATI, OHIO, ASSIGNOR.. T CINCINNATI GRINDERS IN- f CORPORATEIQ OF CINCINNATI, OHIO, .A CORPORAATION 0F OHIO VALVE GIRINDIEIIR;l

. Application led April 12,

10 the necessity of chucldng the' article prior to grinding and which will at the lsame time insure a more accurate concentricity of stem 'and seat surfaces than has been commercially attainable by the use of the prior art methods and mechanism.

' A further object `of the invention is the provision of an improved machine for formation of a ground-surface on the head of a valve .or like article in definite concentric relation to a previously formed stem' there.- on, which machine shall be readily adjustable to operate on different sized articles as respects to the diameter of the head or stem 0r to the length thereof.

Another object of the invention is the provision of an improved machine which shall be substanti ally automatic operation-and which will require minimum time and eort on the part bf the operator. in roperly po- 3o sitioning the work within t e machine,v

clamping, releasing and ejecting the work7 thus reducing the. idle time ofthe machine to a minimum and increasing the productivity thereof.

Other objects and advanta es of the present invention should be ready apparent by reference to the following.specification-considered in conjunction with the accompanying drawings forming a part thereofl and it will be understood that any modifications in structural details or combination of parts as hereinafter described within the scope of what is claimed may be made without departing from or exceeding the spirit of the invention.

Figure 1 is a front view of an "embodiment ofthe invention.

Figure 2 is a plan view thereof. Figure 3 is an enlarged elevation of the c; work supporting and controlling members 1929. I Serial N0. 354,631.

as from the position 3--3 indicated in ure l. 1

Figure 4 is a fragmentary section on line 4-4 of Figure 3.

`Figure 5 is a fragmentary section on line 5-5 of Figure 3.

Figure 6 is a section on line'6-6 of Figure 2. A Figure 7 isa vertical section through the .work stem engaging mechanism as on line 7-7 of Figure 3.

Figure 8 is a section showing the work head engaging member as from the line 8-8 of Figure. l

Figure 9 is a' fragmentary section on line 9-9 of Figure 8.

Figure 10 is a section on line 10-10of Figure 1.

In the drawings, the numeral 20 designates a suitable grinding machinebed provided with the longitudinally extending ways 21 for the main slide 22 capable of being secured in adjusted position on the bed as by clamp 23. Mounted on this slide is the .supplemental slide 24 bearing the regulating wheel 'drive unit-25 which may be of conven- Figf tional centerless type and includes a bracket v member 26 bearing a regulating wheel 27 rotatable at a slow speed in a clockwise directioniwhen viewedJ from the front of the machine. In the form of invention illustrated the bed 2O 'is shown as'formed with an upstanding bracket 28 rotatably supporting adjusting, screw 29 bearing pilot wheel 30. Ihis screw is engaged in the swivel sleeve 3l carried by unit 25 with the result that rotation of the screw will impart in .and out movement to the unit 25 either with i In addition to the initial position adjustment effectable by rotation of screw 29 an in-feed movement of prescribed amount may be ell'ected by oscillation of sleeve 31 which,

for this purpose, is provided with the elongated actuating handle 33.

This handle also serves for actuation of the work clamping and ejecting mechanism as will be hereinafter described.

It is to be understood that the present machine while not of conventional centerless type operates in accordance with the basic principles normally utilized in conjunction with such machines. It is partic- I ularly adapted for the grinding of the head portions of articles such" as the mushroom type valve customarily employed in interhal combustion engines. Such a work piece is shown in the drawings comprising a stem or shank portion 34 and head 35 which latter is designed to have p roduced thereon the seating face 36. In the use of such an article the stem Vis the determining factor as to ultimate position of the valve since the stem slides in an elongated guide sleeve or the like of the engine. It is therefore desirable first to form the stem as by grindingA in a centerless grinder to determine 'its ultimate cylindrical form and axis. The stem having been so formed it may then desirably, be mounted on an angle top work rest blade 37 carried by a bracket 38 on slide 22 and the -regulating wheel unit adjusted in proper pbsition to engage the work piece on rest 37 when the two slides are locked together in 'i unitary relationship. To retain the work in position in the machine use is made of suitable work lamping members such as the rollersv 39 shbwn in the drawings, said rollers being carried on a spindle 40 in a self-aligning bearing 41 supported on an arm 42, for insuring uniformity of rollerd pressure on the work.

'To provide means whereby the machine may be used to operate on work pieces having a different size stem as' respects the diameter, the armi42` is adjustably aiixed to a supporting arm 43 projecting up from an oscillatable shaft 44 which passes through and'- is journaled in work rest bracket 38. The arm and its rollers are positively orced into work clamping position by cam 49 on sleeve 89 acting through roller 48 and bell crank lever- 47 coupled with rock arm 43 by screw 47 An arm 45 adjustabl'y ailixed to shaft 44`has a spring v46 affixed to the bracket, as best shown in Figure 5, and tends to 'oscillate the rollers 39 away from the stem 34. It will thus be seen that when the rollers |39 are` in engagement with the work, the work is positively urged downward into the trough between the work rest blade and `the regulating wheel and held in intimate the bracket'38 is further provided withA guide portions 50 for the combined stop and.

'ejector rod 51 whose ultimate movement in one direction may be suitably limited as by nter-engagement of the actuating block 52 f thereon with the adjustable stop screw 53 inguide portion 50. When work pieces having a different size stem as respects to length are to be operatedon, stop screw 53 may be adjusted accordingly. A' rock lever 54 pivoted as at 55, when operated by areciproeating plunger 60, acts to move the tooth 56 against pawl 57 on the block in aright hand direction, as viewed on Figure 3, while a compression spring 58, acting against a collar 59 on the end of rod 51 tends to urge the rod into a stop position. It'will be understood that movement of plunger 60 to the left will move the rod 51 to move Ia work piece outward or injan axial direction oi the supporting rest, and that at about the position shown in Figure 6, pawl 57 will slip off tooth 56, allowing spring 58 to retract r`od 51. When tooth 56 is returned to its initial position by the retraction of vplunger 60, it rides over pawl 57, which pivots to allow it to pass by, and pawl 57 is returned to its upright actuatable position' by its spring in block 52.

In order that the work may be retained during grinding in proper position in contact with the 4stop rod 51 use is made of a work head contacting roller 61, which is carried on an axle 90 horizontally adjustable in the stem 91.. Stem 91 is vertically adjustable in arm 62, which arm has a universal pivotal support 63 on bracket 38. By this means, the roller may be adj ustedfor work heads of different diameters. A spring 64 adjustably secured as at 65 urges ioo the lower end of Varm 62 outwardly to move the roller 61 in a diagonal direction inward toward the work head, the direction of movement of arm 62 being guided by a linger thereon having a roller 66 engaging a fixed cam 67. Another finger 68 on the arm 62 has a roller 69 positively actuatable by an oscillating cam 70 for pivoting arm 62 away from the work head when. lit is desired to permit the completed work piece to bere-l moved from the machine. When, the work is in position on the work rest, rollersl 39 act in opposition to and in conjunction with the work rest blade and regulating wheel'to rotatably support the work and at the same time it is urged toward the ejector stop by the roller 61.` It is then in the same position as when the stem thereof was being ound in a centerless grinder and the aXial relationship of the work to the machine is determined by the-engament of the regulating wheel and work rest therewith and'inde- ,pendent of the use of variable clamping jaws, rotatable chucks or collets depending accuracy of their supporting bearings or other like structures. Consequentl the work is most accurately supported for rotation about a definite. 'and .unvarying axis eliminating to a maximum errors introducable by mechanical connections or supports thereof. It can then to advantage have the head portion thereof ground in accurate concentric relation t the preformed cylindrical stem surface. j

For the performance of this grinding there is preferably ailixed to the'bed a slide or carrier 71 bearing the grinding wheel spindlel72 driven from a suitable source of power at a grinding rate of speed in a clockwise-'direction and having mounted on lts \inner end the cup grinding wheel 73. The spindle 72 is provided with the self-cone tained oscillator unit 74 for imparting a slight axial reciprocation to the spindle and wheel carried thereby. On account of the arrangement of parts it will be particularly noted by reference to Figure 2 of the drawings that the grinding wheelspindle is held in diagonal relationship to the bed of the machine .as an entirety and that while the movement of the regulating wheel slide and work supporting mechanism is parallel with the bed the oscillation of the 'grinding wheel is diagonally -related to such feeding movement. The grinding wheel has been shown as formed with a lateral operative surface as at 75 substantially parallel with the axis of the wheel and `in the present instance so disposed as to form substantially a fortyive degree bevel on-the head 35 of the valve.V

In this relationship of parts the reciprocation of the grinding wheel spindle will cause the operative face of the grinding wheel to have a linear traverse over the work tending to exert a self-truing effect on the wheel surface and to lprevent the formation of scratches or the like byl're-current engagement of grinding wheel and work. It will further be noted on account of the relationship of parts that the cutting action of the grinding wheel is diagonally exerted against the face being ground eliminating the tendency tov forma-tion of circumferential scratches or the like by imperfections on the wheel. It will additionally be noted that the action of the wheel is on fthe outer un,

separation of the work and the grindingy wheel, a release of the lateral pressure members and a shifting of the valve head engaging roller into such position that-.the

work may be axially removed without contact` therewith. These several operations in complished by a single movement of the lever 33 in a direction away from the operal tor. As the lever is so shifted it serves to oscillate sleeve 31 thus retracting the regulating wheel unit and associated parts as respects the grinding wheel. During the initial portion of this movement, the pin 76 on lever 33 has been moving idly in notch or recess 77 of slide rod 78. rIthis slide rod has a ratchet portion 79 for cooperation with the pinion 80 on the oscillating actuation shaft 81 for actuation thereof. v

'On the other end of shaft 81are an arm 82 and an adjustably aflixed crank 83. The arm'has a pin 84 riding up and down in a slot 85 in'a block. 86 on the end of reciproeating plunger 60, while the crank 83Vhas a .link 87 connected to an arm 88 fixed on an oscillating sleeve 89 in which plunger 60 is journaled, which-sleeve operates the cams 49 and 70 aforesaid.

Continued shifting of lever 33 moves slide rod 78 toward the position shown in Figure 10, and oscillates shaft 81 with arm 82 and crank 83 in a counterclockwise direction from the position shown in Figure 3; The

motion of the crank causes link 87 throughl varm 88.to oscillate sleeve 89 thereby actuating cams 49 and 70 simultaneously. Cam 70 acts against roller 69 causing arm 62 to carry roller 61 laterally outof contact and alignment with the work piece head 36 against the pressure 0f spring 64. During this movement roller 69 riding on fixed cam 67 swings arm 62 forwardly. Meantime cam 49 releases roller 48 permitting shaft 44 to be oscillated by its spring 46 to move rollers 39 out ofcontact with the stem 34 of the work piece,iand the work piece is thus released and is ready to be ejected.

Oscillation. of arm 82 serves to move plunger 6() to the left,'as viewed in Figure 3 causing tooth 56 to swing through an arc from the position shown in Figure 3 into contact with pawl 57 on block 52. While the tooth travels through this arc, the cams 49 and 70 will oscillate suficientlyto move the rollers 39 and 61 out of contact with 'the work piece.. Continued oscillation of these cams will be ineffective so far as additional actuation is considered, but will merely hold the ,rollers in released position4 whilethe continued movement of the tooth as caused by the plunger will cause the work lpiecee eJectin'g rod 51 to move to the right andA eject the work piece as tooth 57 moves beyon contact with pawl 56 just as lever 33 reaches its most advanced position, Aand spring 58 is free 4to immediately return rodv 51 to its left or stop position. 'When this yis done, it is merely necessaryfor the operat'or to insert a new work' piece and reverse the shifting lever to its original position vwhen the work will be automatically clamped in proper position and then advanced into engagement with the grindin I Wheel, y

It Will thus be seen that there has -been provided an improved automatic Work retaining and releasing means for positively laterally urging and clamping the stem of a Work piece in rotary engagement with a regulating Wheel for controlling the rotation of the Work piece and axially urging the same against a definite and adjustable stop in the direction-of the grinding Wheel operating on a portion of the. Work piece distant from the regulating Wheel.

It Will be further noted that the axial tension of the work piece is preferably byl resilient or yieldingv means allowing the Work piece to automatically adjust itself axially in position Within the machine and preventing jam or breakage of parts incase the Work piece is over-size as respects to length.

In addition it will be noted that the several Work engaging membersare all adjustable that the -machine may be readily and easily adapted to perate on work pieces of a different size, and that the members are so inter-connected with the feed control mechanism of the machine as to properly engage and holdthe Work during the feeding movement and to automatically release and discharge the Work on relative separation of the Work and the grinding member.

It is to be understood that i'; is desirable in the formation of the valve seat that this surface be suitably urged in the directionof the angularly related operative face of the 'grinding Wheel. vAt the samev time it is desirable that the means holding the Work in this direction be an impositive one which Will accommodate itself to variations in length of stem or initial variations in condition of the seat to be ground involving removal of greater or less amount of material. y

The Vproper impositive urge of the Work piece may therefore be effected either through the use of a spring pressed member such as the roller 61, by tilting of the 'regulating Wheel in 'such manner that'it will exert a feed thrust or component urging the Work stem against the ejectorstop 51, Which relationship of par-Ls is particularly illustrated in Figure 6, or by a combination of these features. j

It will therefore be understood that Where i the term means Vexerting an impositive urge on thework has been employed that various equivalent mechanisms such :as

yieldably actuated rollers, angled control Wheel or the like may be considered as jointly and severally referred to thereby.

What is claimed is: j 1. A grinding machine, including a grinding Wheel and a regulating Wheel, means hflding the Work laterally against the regula ing wheel, ejector stop mechanism for holdingithe Work axially toward the regulating Wheel, a rock arm to successively engage, act-uate and disengage the ejector mechanismen movement in a-Work ejecting direction, means for returning the ejector to work stop position .on such disengagement, and adjustable means for variably limiting the stop position'of said ejector.

2. A grinding machine, including a grinding wheel and a regulating Wheel, said regulating wheel being retractable from the grinding Wheel by (an actuatable lever, an oscillatable shaft, and means shiftable by said oscillatable shaft for positively locking the Work piece against lateral displacement and impositively securing the same against axial displacement.

3. A grinding machine, including a grinding Wheel and a regulating Wheel, said regulating Wheel being retractable from 'the grinding Wheel byan actuatable lever, an oscillatable-shaft, means shiftable by said oscillatable shaft for positively locking the Work piece against lateral displacement and impositively securing the same against axial.

displacement and adjustable means for vary- 1ng the lmposltive urge of the Work piece in an axial direction.

4. A grinding machine including a grind-v ing Wheel and a regulating Wheel, said regulating Wheel being retractable from the grinding Wheel by an actuatable lever, an oscillatable shaft, 'said shaft being oscillatable by said lever, means shiftable byfsaid oscillatable shaft for positivelyjlocking the Work piece against lateral displacement andA impositively securing the same against axial displacement `from said regulating Wheel, an ejector stop mechanism, a rock arm shiftable by said oscillatable shaft to successively engage, actuate and disengage the ejector mechanism on movement in one direction and adjustable means for variably limiting the stop positlon of the ejector stop in the .other direction. 1

5. A grinding machine including a grinding Wheel and a regulating Wheel, an oscillatable shaft, positive means for clamping the Work shiftable by said oscillatable shaft, and Work stop ejector mechanism operable by said oscillatable shaft, said mechanism including an oscillatable actuating arm, an

ejector, anda yieldable detent carried by the ejector projecting into the path of movement of the actuator arm whereby the arm will positively shiftthe ejector in one .direction and will ride by the detent on movement in the opposite direction. l

6. A grinding machine including a grinding Wheel and a regulating vvheel, an oscillatable shaft, an oscillatable sleeve operative by said shaft for positively clamping the Work laterally against the regulating ejector mechan lating wheel being retractable from said' by said oscillatable shabft, an ejector mechanism, said ejector mechanism being operative by said reciprocating plunger.

7. A grinding machine including a grind-- ing Wheel and a regulating wheel, an oscillatable shaft, an oscillatable sleeve operative by said shaft, cam means operative by said sleeve for clamping andreleasing a work piece, afreciprocating plunger Within said sleeve, said plunger being reciprocatablelby said shaft, an ejector stop mechanism, and a rock arm\ movable`by said plunger to successively engage, actuate and disengage the ejector mechanism on movement in one direction When the' Work piece has been released. I

8. A grinding vmachine including a grinding wheel and a regulating Wheel, said regulating Wheel being retractablel from said grinding Wheel by an actuatable lever, an oscillatable shaft operative by said lever, an oscillatable sleeve operative by said shaft for llaterally and axially holding and Irea plunger reciprocable Within said sleeve by .said shaft, a work stop and ejector mechanism, a rock arm operative by said plunger v to successively engage, actuate and disengage the ejector mechanism on movement in one direction, and adjustable means for variably limit'ng the stop positionI of the hsm in the opposite direction.

9. A grinding machine including a grinding Wheel and a regulating Wheel said regugrinding Wheel by an actuatable lever, an oscillatable shaft operative by said lever, anoscillatable sleeve operative by said shaft, 'means actuatable by said sleeve for holding thev Work laterally in positive engagement With the regulating Wheel and for releasing the lateral engagement. means actuatable by said sleeve for axially holding the Work imvpositively toward the regulating Wheel and for releasing said axial engagement, a plunger reciprocable within said sleeve by said shaft,

a Work stop and ejector mechanism, means -operative by said plunger when the Work is laterally and axially released to successively engage, actuate and disengagethe ejector mechanism for movement in a .work eject-` ing direction, means for returning the ejector to a stop position on such disengagement and adjustable means for variably limiting the stop position of the ejector in the opposite direction; l

-10. A- machine of the charactei` described including a bracket, a Work rest and a regulating wheel disposed adjacent thereto, means for laterally urging the Work towards the regulating wheel comprising a pair' of rollers for engagement with the periphery mechanism and of the stem of the work, aspindle for said rollers rotating in a self-aligning bearing, an adjustable arm carrying said bearing, an oscillatable shaft journaled in the bracket supporting said arm, a bell Vcrank attached to said arm, cam means actuating said crank to positively urge the arm toward the work and resilient means tending to oscillate the shaft to retract the armfrom'the work and disengage the rollers therefrom and means laterally displaced as respects said regulating Wheel for grinding a projecting portion of the Work. t

11. A grinding machine .of the character described including a bracket, a work rest and a regulating wheel disposed vadjacent thereto, means for laterally urging the Work positively toward the regulating wheel, 'additional means for axially urging the work toward the regulating wheel comprising a Work head contacting roller, anaxle therefor, a stem adjustably carrying said axle, an arm universally pivoted in said bracket adjustably supporting said stem fixed cam means`on said bracket, a finger on said arm guided by said cam means, a second finger xed on said arm, an oscillating cam for actuating said second finger to move the Work head contacting roller diagonally away from the Work head and adjustable resilient means urging the arm to move the roller to'- Ward the Work head, and means laterally displaced as respects said regulatingwheel for grinding a projecting portion of the Work.

`12. A machine of the character described including a bracket, 'a Work rest and a regulating Wheel disposed adjacent thereto, adjustable means for laterally urging the work positively toward the regulating wheehadditional adjustable means for axially urging the Work on4 the Work rest, al grinding Wheel,

means for imparting a relative feeding and retractive movement tothe work supporting rinding wheel, and means for automaticall releasing and ejecting a Work piece on the relative retractive movement of the parts comprising an oscillatable shaft, a Icrank adjustably aliixed on` said shaft, a sleeve journaled in the bracket o scillatable by said crank, cam means actuated by said sleeve for causing the lateral and axial work urging means to retract, an arm on said oscillatable shaft, a reciprocating plunger journaled in said sleeve and actuated by said arm. A rock leveractuatedjby said plunger, a tooth oscillated by said rock lever, a work stop rod bearing a paWl in the.

path of oscillation of said tooth to actuate said rod in the work ejecting direction, re-A silient means retracting said rod to stop position and adjustableV means-fixing the retractive limit of said rod, said cam means also serving to hold the lateral and axial Wrk urging means in retracted position during the ejecting and retracting action of the rod.

13. A machinerfor the grinding of a headed work piece including a Work rest for lateral engagement with the periphery ofthe stem portion of the Work plece, a regulating Wheel adjacent the Work rest for progressive vperipheral engagement with the Work piece l stem, self-aligning adjustable roller meansJ for pressing the stem 'on the rest into posito resiliently'engage with the same.

14:. A machine for the grinding of a headed workpiece-including a Work rest for lateral engagement With the periphery of the lstem portion of the Work piece, a regulating Wheel adjacent the Work rest for progressive peripheral engagement with the work piece stem, adjustable roller means for pressing the^stem on the rest into engagement Withy the regulating Wheel, adjustable resilient means tending to retract said roller means from lsaid stem, an oscillating cam for positively actuatingthe roller means against the action of said resilient means, an adjustable Workhead engaging roller, adjustable resilient means for imparting an axial component of movement to said head roller toward the Work piece,'a c am guide for-adding a lateral component -of movement to said head roller,

an oscillating cam for positively retractingthe head roller' laterally and axially as respects the Work head and for permitting the vhead roler to resiliently engage with the same, and a common oscillating shaft operating both said-oscillating cams.

l5. A machine for the grinding of a headed Work piece including a Work rest for lateral engagement With the periphery of the stem portion of the Work piece, a regulating Wheel adjacent the Work rest for progressive peripheral engagement with the Work piece stem, adjustable roller means for pressing the stem on the rest into engagement with the regulating Wheeladjustable resilient means tending to retract said roller means from sa1d stem, an oscilla-ting cam for positively actuating the roller means l against the action of said resilient means,

`an adjustable Work head engaging roller,

adjustable resilient means for imparting an axial component of movement tol said 'head rollertoWard-the Work piece, a cam guide for adding a lateral component of movement to said head-roller, an oscillating cam for positively retracting the head roller laterally and axially as respects the Work head and for permitting the head roller to resiliently engage with the same, a common oscillating sleeve operating both said oscillating cams, an adjustable stop and ejecting rod terminally engaging the Work piece, a plunger for actuating said rod to eject the Work'jpiece when the head and stem engaging rollers are disengaged therefrom, said plunger being reciprocable within said sleeve, an actuating shaft for said sleeve and said plunger, means connecting said shaft and said sleeve, and means connecting said shaft and said plungerfone of said connecting means being adjustable.

16. A grinding machine including a grinding Wheel and a regulating Wheel, said regu- 'lating Wheel being retractable from the grlnding Wheel, an actuating lever forA effecting said retraction of the vregulating Wheel, an oscillatable shaft, means actuated by said shaft for positively clamping Work laterally against the grinding Wheel and Yfor impositively axially urging said Work transversely of the regulating Wheel, said means being operative to unclamp and release the Work on actuation of the lever to retract the regulating Wheel from the grinding Wheel.

17. A grinding machine including a grinding Wheel and a regulating Wheel, said regulating Wheel being retractable from the grinding Wheel, an actuating lever for effecting said retraction of the regulating Wheel, an oscillatable shaft, means actuable by said shaft for positively clamping the Work laterally against the grinding Wheel, means actuable by said shaft for impositively axially urging the Work transversely of the regulating Wheel, and means shiftable by' said shaft for ejecting the Work,'said shiftable means being operative to release and ejectv the Work on actuation of the lever to retract the grinding Wheel from the regulating Wheel. J

1s. A grinding machine including n grinaing Wheel and la regulating Wheel, means holding Work laterally'against the regulating Wheel, an ejector stop mechanism for axlally positioning' the Work transversely of the regulating Wheel, a rocker arm for successively engaging, actuating and disengaging the ejector mechanism While traveling in one direction, vand means for returning vthe ejector to Work limiting position upon such disengagement.

In testimony whereof I atiix my signature.

` CLEMENT BOOTH.

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