USRE17311E

USRE17311E - A cobpoba

Info

Publication number: USRE17311E
Authority: US
Publication date: 1929-05-28

Description

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GRlNDER.

Original Filed March l, 1920 Y May 2s, 1929.

May 2s; 1929. y H' 1- SWANSON- Re. 17,311

v GRINDER.

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UNITED STATES riait or omo.

ing machine in which' the work is supported and rotated and may be moved axially without the aid of positively driven work sup-y porting centers, and the chief object ofthe invention is to provideV a structure which will cause a noncylindrical pieceof work to und to a cylindrical form. j

invention further consists in a ywork holder comprising blades, Vplates or guides adapted to engage and guide cylindi'ical blanks along the grinding surface of a ding wheel, and supporting mechanism or-the guides whereby they vmay be rotated on an axis, parallel `to the axis of the work.

It further consists in providing a supportpermit the guides to be rotated "as a unit about an axis substantially. perpendicular to the axis of the work.

,It also consists in providing means for the wheel.

It also consists in the details of construcf A tion illustrated in the accompanying drawings and particularly pointed out injthe Intheaccoin is a side elevation o f this im rov grinding machine with a portion ofv table broken away to show the method of a thereto the estals for Ythe grindi wheel arbor. .2isaplan of thegrin machine. Fig. 3 isan elevation of the work i -holder orb-guide block. F' 4 is a section on theline4--4ofFi `ig.5isafsecti0n ontheline5-5of ig.1on'alar hsiiai;

. Fig. 6 is an 'end elevation of the wo on a. scale.

Similar reference characters refer to like parts thr out the several views.

The grin machine is ofthe same general character as7 tha Patent No. 1,106,803, granted .August. 11, 1914, to R. H. Grant, and is for the purpose of grinding cylindricalblanks Suchas the i rollers of roller wrist pins of enginas and other parts of whi i must be as nearly perfect cylindersas'pdssible. This machineHikethatshown in the dra visadatedto grindthesecylindrical wi out the =ty of reviously centering them and an cantera.

This invention relates to a centerless grind a ing mechanism forl said guides 'which willi moving this rotatable .guide toward from t shown in'- Re. 17,311 PATENT OFFICE. I

HARRY J'. SWANSON, 0F DETROIT, MICHIGAN, ASSIGNOR, BY IESNE ASSIGN'HIBI'il!S, T CINCDTNATI GBINDEBB INCOBPOBATED, 0F CINCINNATI, OHIO, A. CORPBA,

GBINDEB.

.original iro. i,sa4,oos, ima December as, i920, sensi nu. assess, alga umn i, i920. applicati for reissue iled August 14, 1926. Serial No. 129,894.

' the waste of the oil or other grinding liquid.v

A'carriage 4 is slidable cn the table by the screw in a well known manner when the The pedestal .l shown in Fig. has securedscrew is turned by the handle 6. Projecting o up from the carriage but forming' a art thereof is a post 7 in which the shaft 8, W ich is indicated in dotted lines in Figs. 1 and 2, is rotatable. This shaft is rigidly connected to the support ors chuck 9 for the 'de block 10. The chuck 9 has a semi-cylin 'cal bearing surface 11 provided with a dove-tail i groove 12 to receive the rib 13 on the guide block. A nut ii on the shaft s V10ers the shaft, chuck and guide block from turning."

The chuck is formed with vertical slots 15 across which the bolts 16 extend andare adapted-to draw the metal on -each side of these slots together and thus grip the rib 13 on the guide The pedestals 18 sup rtan arbor 19 on which is mounted a' ing belt 21 and the nical grinding wheel 22 which is turned in the direction of the arrow in Fig. 1. The shaft 8 is substantially radial to the face of 'this'wheel and ey20 for the driv-Y I -central groove 25 to receive the central back Y blade or guide 26 whose inner edge is at right angles to its parallel sides and which is ch` the ide block 10 by means of bo ts 30 whose are slidable -in the T-grooves 32 in the hea .guide block. The outer side of the top guide should slant hack from the lane of the outer side 'of the bottom blade a ut thirteen and one-half degrees and the'angle between its `parallel sides and its ends 83 is preferablyv .Y

lock and prevent it -from rotat- "l5 guide and the center or back guide to be about of the wheel are in the same drical grindin work is causedtl) seventy six and one-half degrees.

Rotary movement of the guide block produces a variation in the co-'eicient of friction becaus'e of the resultant of the pressures of the grinding wheel and the back guide resisted by the bottom guide. The center of the work and the center of rotation of the guide block should be the same and the line of contact of the grinding wheel is always the same for any position of the guide block. By turnin the guide block to the left in Fig. 6, the riction of the work on the bottgm blade is decreased. Turning the guide block moves the point of intersectiomof the plane of pressure between the work and wheel up and down thebearing edge of the back guide plate.

Assuming the work to be a polygon having' a large number of sides, it will be noticed that by turning the guide block, it will be possible to obtain a position when an angle of the polygon will contact with the 'grinding wheel while a side of the olygon will contact with the end -of the bac guide. This will of course result in a minpte at taking the place of the angle and further results in a polygon in which the number of sides becomes i so great that practically perfectly round work is obtained. I have found that to obtain this perfect work, the circumferential distance from the line of contact between the work and the grinding wheel to the linev of contact between the work and the bottom blade should be lsuch that it cannotbe divided equally into the circumference of the work. 4

The grinding wheel causes the work to move endwise between the blades. By turning. the guide block-.su portion ,its shaft` the: rate of this 'feed may be varied, the slowest lfeed being had when the-work and the arbor lane.

The face 23 of the guide block may be formed with grooves 36 to constitute passages for the -oil or other grinding liquid which ows to the rotatin cylindrical work. The T-grooves 32 in this ace also serve this purpose.

It will be understood that the work support may be used in connection with a c linwheel since the feed o the y the screw-like action of the grinding wheel upon the work whenV the work axis and the wheel axis do not lie in the same plane. Or it may be used in .connection with a wheel which has its grinding surface `on one side or at an angle between that of a flat disk l and a c lin er.

The etails` of construction and the roportions of the parts may all be change by those skilled in the art without departing from the spirit of my invention as set forth in the following claims.

I claim 1. A work holder comprising a guide block and plates adapted to engage and guide cylindrical blanks along the face of a grinding wheel, a shaft extending substantially radially to the face of the wheel and on which the guide block is mounted, and means rotatably supporting said shaft, said ,means comprising a carriage movable toward and from the grinding wheel, said. guide block being formed substantially semi-cylindrical and said shaft being formed with a head having a semi-cylindrical recessin which said guide block is rotatably mounted.

2. A Work holder comprising a substantially semi-cylindrical guide block having an axial groove and three guide plates mounted thereon to' engage and guide cylindrical blanks along the grinding surface of a grinding wheel, the niiddle guide being at substantially right angles to one of the other guides which are attached to the fiat sides of the guide block, one `on each side ofthe axial groove.

3. A work holder comprising a substantially semi-cylindrical guide block having an axial groove and three guide plates mounted thereon to engage and guide cylindrical blanks along the grinding surface of a grinding wheel, the middle guide being at substantially right angles to one ofl the other guides which are attached to the flat sides of the guide block, one on each side of thel axial groove, a shaft extending substantially ra'dially of the face of the grinding wheel and on which the guide block is mounted, and means to rotatably support said shaft.

4. A work holder comprising a substantially semi-cylindrical guide block having an axial groove and three guide plates mounted thereon.L to engage and gulde: vcylindrical blanks alon the rinding surface of a rindin wheel, t e midle guide being at su stantia ly right angles to one of the other guides which areattached to the fiat sides of the guide block, one on each" side of the-axial groove, a shaft extending substantiall radially of the face of the grinding wheei and on which the guide block is mounted, means to rotatably support said shaft, said shaft being formed wlth a head having a semi-cylindrical recess to receive said-guide block, and means to lock the guide block from turning in said recess.

5. In a centerless grinding machine having I a grinding wheel, means to rotate the same,

- ing wheel Whiclrlies at an obtuse angle to a -e'qually into the circumferential distance plane tangent to the Work and passing through the line of contact of the work and the wheel, and a.member to hold the work on the guide in operative contact with the grinding Wheel, said supporting guide having its operative face so related to the grinding wheel that the. circumferential distance from the line of contact of the work with said operati've face to the line of contact of the work with the grinding wheel is not divisible around the work.

6. In a centerless grinding maehi ne having a grinding wheel and a structure to hold work inoperative relation therewith, saidstructure comprising a supporting guide having a tace contacting with the work adjacent to the grinding wheel in such a position that the ci rei'lmt'erential distance from the line ot' contact of the Work and the grinding wheel to the line of contact. of the work and the guide is not divisible equally into the ci rcumi'e rential distance around the work, and means to hold the work in rotative contact with said wheel and guide. Y,

7. In a centerless grinding machine having a grinding wheel and a structureA to hold work in operative relation therewith, said structure comprising a supporting guide l1 aving a face contacting with the Work adjacent to the grinding wheel in such a position that the circumferential distance from the line of contact of the work and the grinding wheel to the line ot' Contact of the work and the guide is not divisible equally into the circumferential distance around the work, means to hold the Work in rotative contact With said wheel and, guide, and means for Varying the rate of axial feed of the Work relative to the wheel.' Y

8. A work holder comprising a guide block 'and three guide plates adapted to engage and guide cylindrical blanks along the grinding surface of a grinding wheel turning on a horizontal axis, the middle guide being at substantially right angles to the upper guide and at anangle of substantially seventy six and one-half degrees to the lower guide.y

9. A work holder comprising a guide block and three guide plates adapted to engage and guide cylindrical blanks along the grinding surface of a grinding wheel'turning on a horizontal axis, the middle guide being at substantially right anoles to the upper. guide and at an angle of su stantiallyseventy six` and one-half degrees to the lower guide, the bearing end of the middle guide being at rightmigles to its parallel sides and the bearing end of the lower guide being at an angle of: substantially forty five degrees to itsparallel sides. V

10. A work holder comprising a guide block and three guide plates adapted to engage and guide cylindrical blanks along the grinding surface of a grinding Wheel turning on a horizontal axis, the middle guide being at substantially right angles to the upper guide and at an angle of substantially seventy six and one-half degrees to the lower guide, the bearing end of the middle guide being at right angles to its parallel sides and the bearing end o'l the lower guide being at an angle of substantially forty five degrees to itsparallel sides, and means to support the guides pennitting them to turn as a unit about the axis of the blanks'.

11.v A work holder comprising a guide block and three guide plates adapted to engage and guide cylindrical blanks along the grinding surface of a grinding wheel turnl ing on a horizontalaxis, the middle guide belng at substantially right angles to the upper guide and at an angle of substantially seventy six and one-half degrees to thelower