US1906745A - Valve grinding machine - Google Patents

Description

May 2, 1933. G] A. FULLIPS 1,906,745

- VALVE GRINDING MACHINE Filed Sept. 9, 1929 s Sheets-Sheed 1 IM M in w M in I "in r I n m u a m w L Q.

y 1 1 33- G. A. FULLIPS 1,906,745

VALVE GRINDING MACHINE Filed Sept. 9, 1929 5 Sheets-Sheet 2 INVENTOR y 1933. G. A. FULLIPS 1,906,745

VALVE GRINDING MACHINE Filed Sept. 9, 1929 3 Sheets-Sheet 5 2/ a 2; f 11 I E: I I? t; 1 i 2/ w? E I j Z 3 fi -22 7 fi: s:

L INVENTOR 6190 efldi azz z'ps BY g ATT NEY valve-grinding tools. g 7

Another object is to provide an improved mechanism peculiarlysuited for valve -gr1nd- '1 Patented May :2, .1933

5 G O GE inrunmrs, or nmnorr, mama. i

, vanva GRINDING, MACHINE a ica io filed se remter-e, 1929. Serial No. 's91,469.-

jThisii-nvention relates to valve grinding machines, and particularly to machines for grinding a plurality of valves simultaf neously,

-Anobject of the invention is to provide an improved mechanism for simultaneously effecting a similar oscillatory rotatlon of a plurality of spindles, individually carrying ing and imparting to a spindle a cycle of rotative oscillations varying as to degree in a predetermined manner. I 7 A further object is to adapt a plurality of rotative chucks to be axially shifted eithersimultaneously or individually to shift tools.

carried thereby .to or from their working .Mpositions. w

These and various other objectsthe 'invention attains by the construction hereinafter described and illustrated in the accompanying drawings, wherein;

Fig: 1 is 'afront view of theimproved "valve grindingmalchine. I

Fig. 6 is a sectional View of said gear train,

taken upon the line 66 of Fig. 5.

In these views, thereference'character 1 f -designates a hollow" pedestal rising from a base21and surmounted by a head 3. Intel'- -me'diately mountedon said pedestal and forwardly' projecting Qtherefrom is a work table 4, adapted in any'desired mannerfor vertical adjustment. Thus a gear 4d journaled 'upon said work table therebeneathand mesh ing"with a rack4b 'vertically'elongated on the pedestal, may be rotatively actuated to raise and lower the table.

Onlthe, forward end of the shaft 22 is' reducing pair of gearsfi and 7 drives a shaft 8 journaled' upon the rear portion of the pedestal; From said shaft another speed reducing. drive is established througha train a of gears 8a to'a jack shaft 9 j ourn'aled in said pedestal some distanceabove the shaft 8. On c said jackshaft, within the pedestal, is swung the upper end of an arm '10, the lower end' of which rigidly carries a'stub shaftll, journaling'a gear 12. drivenby a" gear 13, fast on said jack shaft. The shaft 8 rigidly (and preferablyintegrally) carries an eccentric 14' journaling the lower end of a link 15 having its upper end journaled on the stub shaft 11.-

Also journaled on said eccentric and'coaxial therewith is.a gear 16, adjacent to which'a'i relatively large eccentric 17 is journaled on the eccentric 14 and'is rigidly connected to the gear 16 in any suitable manner, .as by pins18. .An eccentric strap 19 peripherally engages the eccentric1-7 and is fast upon the lower end of a connecting rod 20, pivoted at its upper end to a rack bar 21 vertically recip rocatory on the rear, portion of the head 3. Journaled in said head transversely to its front and rear faces is-a shaftl22 rigidly carrying apinion23 meshingiwith the rack bar' 21 and rotativelyv oscillated by the latter.

mounted fast a pinion 24"meshing with a .80}

- rack 25 formed upon the topface of'a bar ken upon the 5 26reciprocatory end .wise of the head 3 in a suitable slide guide 27 carried at the front of the head 3. Said bar'further has a rack 28 on its front facefor driving a plurality of pinions 29 individually. fast on a row of vertical spindles, 30, journaled in. multiple bearings 31 forwardly projecting from the" head 3 :above and below said pinions. I

'From the lower portion of the head an multiple. bearing 32: projects forwardly to. journal tubular tool holders 33, respectively. telescopically(receivingthe lower; end por- 1 tions of the spindles .30iandidriven the @5 latter through pins; 34 thereon. engaging in longitudinal slots 35 in the upper end por tions of said tool holders. It will beinote'd,

I p g r that this drive connection afiords the tool r At some suitable point on thebase 2 is jmounteda motor 5 which, through a speedholders a limited reciprocationonithefspindles without interruption of the drive.

Below the lowermost bearing 31, the spindles 3O loosely carry collars 36 between which and the tool holders 33 coiled springs 37 are compressed to eXert downward pressure on said tool holders. The latter project below the bearing 32 and have their lower ends adapted in any suitable manner to. carry chucks 38 mounting valve-grinding tools 39. These are engageable with any suitable work carried by the table 4, such as the valve seats 40 of an engine block 41.

Above the bearings 32 the tool holders 33, are formed with annular shoulders 42 beneath which engage ring-shaped yoke por tions 43 of lever arms 44. The latter project correspondingly forwardly through openings in the front of the head 3, being journaled upon a shaft horizontally mounted in said head parallel to its front face. Rigidly individually connected with the arms 44 are lever arms 46 rearwardly projecting. from the shaft 45 and carrying at their rear ends screws 47, adjustable substantially vertically.

Horizontally ournaled in the head 3 above the rear ends of the lever arms 46 is a shaft 48 rigidly mounting a plurality of cams 49 respectively above said arms, and in normal .bearing contact with the screws 47. Said shaft is adapted to be driven from the shaft 8 through a chain 50 carried by sprocket wheels 51.

The lever arms 44 project forwardly of the yokes 43 to provide handles for raising any ofsaid arms to elevate the engaged tool.

holder 33. For raising or lowering said tool holders simultaneously, a lifter bar 52 horizontal'ly extends beneath the forward ends of the arms 44 and is vertically adjustable on the head 3. Thus said bar has in its'end portions vertical slots 53 receiving pins 54 forwardly projecting from said head, and pair of rollers 55 similarly journaled on the ends. of said bar rest on eccentrics 56 terminally fast on a rock shaft 57. The latter is journaled in lugs 58 on. the bearing 32 and may be rocked by a handle 59 on one of its ends to swing said eccentricsup or down to raise or lower the bar 52.

In operation of the described machine, the motor 5 when energized drives the shaft 8 several'times faster than the eccentric 17. The latter tends to reciprocate the rack 21 55-, -in a harmonic motion of constant stroke.

Actuation of the rack is modified, however, by the relatively rapid bodily reciprocation of the large eccentric resulting from its mounting 011 the small eccentric, subjecting the rackto a cycle of reciprocations, each varying in stroke. a That is to say, each such cycle will comprise certainl reciprocations in which the strokes of the two eccentrics supplement each other,to effect amaXimum composite stroke, and; others in which. the eccentries oppose each other to produce a mini mum stroke.

The varying reciprocation of the rack bar 21 effects a corresponding oscillation of the shaft 22, and reciprocation of the rack bars 26. The latter correspondingly oscillate the spindles 30 and tool carriers, whereby the tools 39 are oscillated against the work in a manner peculiarly advantageous in removing high points on valve seats.

The individual vertical adjustability of the tool carriers 33 permits ready inspection of the work being done by any of the tools, and when one job of grinding is completed, the tools may be simultaneously raised by the bar 52, as shown in dash lines in Fig. 2, during positioning of a new piece of work onthe table 4.

It will be apparent to those skilled in this art that the cycle of reciprocatory motions imparted to the connecting rod 20 is depend ent upon the relative speeds of the two eccentrics 14 and 17 .7 In other words the number of minor reciprocations of said rod which are concurrent with one major reciprocation thereof may be increased or diminished by providing a higher or lower speed drive to the smaller eccentric With relation to the drive to the larger eccentric. Thus the connecting rod may be given different reciprocatory movements suited to various different purposes by simply changing the speed ratio between the two eccentrics.

While it will be apparent that the illustrated embodiment of my invention herein disclosed is well calculated to adequately fulfill the objects and advantages primarily stated, it is to be understood that the inven tion is susceptible to variation, modification and change within the spirit and scope of the subjoined claims.

What I claim is: l

1. A valve grinding machine comprising a plurality of parallel spindles, tool holders reciprocatory on said spindles, means main taining a drive from said spindles to said tool holders in all positions of reciprocation of said tool holders, means for rotatively oscillating said spindles in unison, levers individually engaging said tool holders, mechanism acting on said levers for periodically raising and lowering sald tool holders, and

means acting on said levers for manually concurrently raising said tool holders.

2. The combination with. a, main shaft and a jack shaft, of an eccentric on the main shaft, a second eccentric journaled upon the first,a drive connection from the main shaft to the jack shaft, a .gear secured to the second eccentric coaxially with the first eccentric, a. gear upon the jack shaft,,an intermediate gear, and a mounting for the intermediate gear affording same an oscillatory mo.- tion transverse to the common plane of said shafts to compensate for the bodily travel 1 Fill.

oflthe second eccentricuponlthe first eccentric.

. 3., The combination with a main shaft and a jack shaft, of an eccentric upon the inaln I shaft,a second eccentric journaled upon the first, a drive connectioncfrom the main to the jack shaft, a gear mounted uponthe jack shaft in driven engagement therewith, a gear secured to the second eccentric'coaxially with the first e ccentric,an arm pivoted upon the jack shaft, an intermediate gear journaled upon said arm, and a swinging link connectels respectively reciprocatoply ing said arm tothe first eccentric. I

4. The combination with an eccentr1c,,a larger eccentric ournaIed-Qn the first-named eccentric, a connecting rod actuable by the larger eccentric, a shaft rigidly mounting 1 the first-named eccentric, drive means'for said shaft and gears driving the large eccentric from said shaft speed. I

5. A valve grinding machine comprising at a relatively reduced a plurality of parallel -spindles,-means forv rotatively oscillating said spindles, tool holdon said spindles, means maintaining a rive from said spindles to said tool holders. in all, po-

7 sitions of reciprocation of the latter, means for automatically .periodically raising and lowering said tool holders, a bar transverse and adjacent to said tool holders, manually operable means for'establishing and maintaining raised or lowered positions of said bar, and a connection between each tool holder and said bar for actuating-the tool holders up or down in unisonwith said bar.

' 6. A valve grinding machine comprising a plurality of parallel spindles, means for rotatively oscillating said spindles, tool holdtool holders in all positionsof reciprocation ers respectively aligned with an reciprocatoryrelative tOSHld spindles, means maintaining a drive from sald spindles to said of the latter, a bar transverse and adjacent e to said tool holders, means mounting said bar for bodily travel inthe direction of reciprocation of saidtool holders, a shaft journaled parallel to said bar, means for manually rocking said shaft, eccentrics on said shaft engaging the end ortionsof said bar to effect its aforesaid odily travel,,and

means engaging'each tool holder withsaid bar to adapt the tool holders for retraction in unison responsive to bodily travel of said bar. I

c 7. The combination with a main shaft and drive means therefor, of aneccentric on said q shaft, a second eccentric journaled upon the first eccentric for actuation by the latter orbitally to the main shaft, a ackshaft, means driving said jack shaft from said main shaft,

a train of gears establishing a drive from said jack shaft to the second eccentric, one of said gears being mounted on the second eccentric for orbital travel therewith, and a' mounting 10a another -of'said gears adapting it for movement transversetofthecommon;

center line of the main shaft-and j ack. shaft to "compensate 3 for the orbital travel of the gear. mounted upon; the second; eccentric.

- s. TheCOm aaiOnah amainshaft and a jack shaft and" drive means for said main connectionfor oscillationwto and from the common plane of said shafts to compensate-- i i i for the orbital travel of'th e second eccentric. c

differing in diameter, the larger thereof being journaled upon the latter to turnabout the centralaxis of the latter, a drive shaft for .thesmaller eocentricsubjecting the larger eccentric to a travel orbital to said shaft,a gear centrally coaxial with. the smaller eccentric,

means rigidly connecting said gear to the larger eccentric, a second gear meshing with and driving the first-named gear, supporting means for the second gear adaptingit for oscillation about the axis of the smaller eccen trio, and means maintaining a drive to the 1 second gear in all positions of its oscillation. 10. The combination with a main shaft and a jack shaft,'of an eccentric on the main shaft,

a drive connection from the main shaft to thejack shaft, a transmission element journaled v on said eccentric for orbital actuation thereby, a gear secured to said transmission element coaxially with said eccentric, a gear upon the jack shaft,.an intermediate gear and amounting for the intermediate gear affording same an oscillatory motion transverse to the common plane of said shafts to compensate for the bodily travel of the sec- 0nd eccentric uponthe first eccentric.

11. The combination with a main shaft and 9. The combination with two eccentrics a jack shaft, of an eccentric'upon the main I shaft, a. transmission element journaled upon saideccentric, adrive connection fromthe main to the jack shaft, 8. gear mounted upon the jack shaft in driven engagement therewith, a gear secured to the transmission ele-' ment coaxially' with 1 the said eccentric, an

arm pivoted uponthe jack shaft, an intermediate gear journaled upon said arm, and a swinging link connecting said arm to said eccentric. a c .12." The combination with an eccentric, and

a shaft rigidly mounting-said eccentric, of av transmission element journaled on said eccentric, a connecting rod, means journaling said rod upon saidtransmissionelement, ec-

vcentrically to theaxis of said eccentric, drive means for said shaft, and gears driving said transniissionv element'from said shaft at a relatively reduced speed,

13. A valve grindingmaehine comprising a plurality of tool holders, a plurality of elements each intermediately engaging one of said tool holders, means-acting on said ele ments at one side of said tool holders for periodically raising and lowering the tool holders, means acting on said elements at the other side of the tool holders for establishing and maintaining a raised position of the tool holders, and means for maintaining an oscillatory rotative drive to the tool holders independently of their raising and lowering 155 travel.

- In testimony whereof I sign this specification.

GEORGE A, FULLIPS.

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