US1938763A - Grinding machinery - Google Patents

Description

Dec. `12, 1933. F S HAAS 1,938,763

GRINDING MACHINERY Filed March '7, 1930 Chiot 1w 1.3

Patented Dec. 12, 1933 GBINDING MACHINERY Frederick S. Haas, Cincinnati, Ohio, assignor to Cincinnati Grinders Incorporated, Cincinnati, Ohio, a `corporation of Ohio f Application VMarch 7, 1930. Serial No. 434,077

` Claims. (Cl. 51-238) This invention relates to improvements in machine tool structures and especially to improvements in cylindrical grinders.' Y I One of the principal objects of the invention is to provide improved means for backing up orv supporting a Work piece during grinding.

Another object of the invention is to provide a universal back rest or steady rest adapted to be utilized for different sizes of work pieces through a relatively wide range;

Another object of the invention is the provision of an improved back or steady rest for use with grinding machines that may also serve as a sizing device to apprise the operator when the work piece has been reducedto the desired size.

Other objects and advantages of the present invention should be readily apparent by reference to the following specification considered in conjunction with the accompanying drawing forming a, part thereof andA it is to be understood that any modifications may be made Within the exact structural details Without departing from orexceeding the spiritv of the invention.

Figure 1 is a fragmentary elevational view of a grinding machine embodying the improvements of this invention.

VFigure 2is a sectional view taken on line 2--2 of Figure 1..

Figure 3 is a fragmentary lsectional view taken on line 3 3 of Figure 1.

Figure `4 is a fragmentary sectional view taken on line 4--4 of Figure 2.

Throughout the several views of the drawing similar reference characters are employed to denote the same or similar parts.

In the drawing the numerals 5 indicates the bed or support having mounted thereon for longitudinal translation relative thereto the work supporting table. On opposite ends of thetable 6 is adjustably mounted; the head stock 7 and tailstock 8 respectively supporting centers 9 and 10 adapted to terminally engage the workpiece 11 to determine the` axis about which` the work piece rotates and for presenting same to the grinding wheel12, Y'

The work piecemay be of considerable length and during fthe grinding operation is apt to be bent or sprung thereby preventing formation of a true cylindrical work piece. Heretofore, steady rests or back rests have been utilized but'were limited intheirv capacity and necessitated the use of a plurality of rests, one for each size of work within relatively small limits. It is contemplated byv-thisapplication to provide a steady or back rest that may be used with equal facility with workA pieces of different sizes throughout a relatively large range. Accordingly, a frame or support member 13 is provided having finished angularly Vrelated faces 14, 15 and 16 formed thereon to engage correspondingly finished and angularly related faces on the work Vsupporting tableV 16.

The frame or support 13 is provided with upstanding lugs 17 through which clamping bolts 18 extend having on their lower ends a clamp shoe 19 substantially L shaped in cross section having one leg 20 thereof engaged beneath a ledge or shoulder 21 formed on the Work support of table 16.

The frame or support 13 is provided with bores 22 and 23 having their axesextending at an acute angle to one another respectively supporting and guiding a rod 24 and a slide block 25. The rod 24 abuts on one end with an adjusting screw 26 threaded into the counter-bore 27 formed in bore 22. An actuating handle or knob 28 is pinned or otherwise secured to the screw 26 and a pair of locknuts 29 are threadedly received by the screw 26.. The other end of the rod 24 abuts a lug or ear 30 integral with pinion 31 and rotatable about pivot shaft 32; The teeth of the pinion 31 engage rack teeth 33 formed on slidable member 34. Intermediate its ends the rod 24 is guided by a support 35 journaled in suitable bearings 36 and 37 formed in side walls 38 and 39 of housing 13. A

From the ,foregoing it will be noted that if knob 28 were rotated to feed the screw 26 into the bore 27, rod 24 would be axially actuated to rotate pinion 31 in a counter-clockwise direction slidably actuating member 34 upwardly through its guide sleeve40- toward the axial center of the Work-L VThe Ysliding member 34 has secured to it by means of a cap screw 41 a shoe or the like 42 having engagement at 43 with the outer surface of the work piece. This shoe is so positioned as to take up the cut thrust of the grinding wheel or other tool 12 since it rotates downwardly as respects the surface ofthe work piece or in a y counter clockwise direction as'indicated by the arrow .in Figure 2. Y The slide block 25is actuated through the bore 23 by means of a screwor the like 44 having a swivel connection'as at 45 therewith. The screw 44 is threadedly received in a threaded bore 46 formed in nut 47 inA turn threadedly secured in the end of bore 23. -An actuating knob 48 is pinned or otherwise secured to the outer end of the screw 44 and a pair of lock nuts 49 are threaded onto the screw 44. .By actuating the screw 44 through fp Work piece beingfspportdtherebyf the knob 48 the slide block 25 is reciprocated through the bore 23 toward and from the axial center of the work piece 11.

Secured to the slide block 25 by means of a cap screw or the like 50 is a shoe 51 for contact as at 52 with the surface of the workpiece. iThis shoe is so positioned'as to take up the thrust on the work piece due to the feeding of the grinding wheel or the like toward the centerof the work. The sliding block 25 and sliding member' 34 are guided in their reciprocatingk motion by means of set screws 53 and 54 having tits55"annd 56 extendingA into the slots-57 and-58, formed-respectively in the slide block"25 and"sliding'-mem. ber 34'. Each of the shoes 42 and 51 are utilized through a given range depending on the amount of reciprocation of the slide block 25 and sliding member 34. f w l As noted above the axes. of thenshoes 42 and 51 and'the slidingmembers 34and 25 extendatan obtuse angle to'oefanother .and-they irte's'e'ct ataY point co-incidnt with the centerv`4 of the work piece being supported'- thereby?`Yv` This "point of intersection isl in thsaneplane a'sthe axis f rotation; of thel` grinding whe1`By' this oonstruction more'thanlninety degrees of thek work piecel isfincluded between 4"thepoirits* of? 'contacts of theshoes therewith and the shoes act 'as clamping members supplementing 4one "another toprevent` jumping'of 'the work 'piece'in addition to taklngup the thrusts as aboveI noted; "'-This relationshlp'-betwe'n the w'f'irl'fpi'eAv and ls'hoesis at all times maintained vregardless of th size of T o; adapt thfstaly lfiest for dtre'rerltvsize ci ywork piece; different size sh may be substituted for shoes-42 and 5f; for' lnstafleei` to support afwork piece offtlier size corresponding `to the smaller work as indicated byibrokn Briefes-a counter-bore 68 formedy inthehdjacentend of Slide block 25 and Slidil'lg'iinrnbe'' 342 V A1 pih'69 is carried by the slide block 25 and sliding member 34 and cooperates'fwithia bore'or'the like 70 formed in-the'shoe 'adjacentlthe 'reduced portion D 67 thereon forpositioriing the said shoes relative to their actuating r'rle'mhers.A A Y It will be understoodtliatany number' ofsimi` lar shoes may be provided andthereby'change the capacity of the back V'or steady rest-from the maximum to the'rninimumf" In practice, and when working'anumberof similar articles, such asfpinion s'hrafts,"'studs,'"pis ton lpins or the like whichare [tov have the saine operation performed on e'aclifo'f "thernfthe slide block 25 and sliding member 42 are adjuste'ddu'ring the finishing of thefrst'ar'ticle to the A"exact sizing` whereupon thez lock nuts 29 and' 49 iare brought up against 'the face' of 'housing 13 and nut ,'47 -respectively vand locked irl' position. y'The screws 26 land 44 are then `backed-away to retract the shoes 42 and 51 and the nishedwork piece ''stopped The finished work piece is then replacedby another unfinished one and the cycle repeated until the last of the lot is complete.

-Y -From this it should be noted that the lock nuts actasa sizing device to apprise the operator when the-'work piece has been reduced to substantially the desired size. It should also be noted that the loc'k nuts need not be` further adjusted except "when changing or resetting the machine for operation on a different size or kind of work piece. As was 'notedabove the shoes 42 and 51 may'be used'forfdifferent sizeof work through a certain: denite range for instance' for work pieces fromr 10 yinches-to 115"inohes'irifdiameteraand a different lpair ofshoesfsubstituted therefor for-work .1

ranging through another band. By this constructlonfthe -p'roper shoesfmay be provided `for each band from the maximum of thev machine with which the back` or'steady rest is employed','such as a 14 or 16 inch cylindrical grinder, down to the'l'desired minimum; such as 6 yfor 4 Vinches-in diameter or even'smallerfif'desired Therefore, as'many asv 12 or more pairs of shcesfvmay be provided'for use with'the same compact -rigid frame" member andassciatedY mechanismsfor supporting and controlling work pieces ranging from four inches, forfexampld-up-to 16 inches,-

for"'exampl`e,`*in'diameteri lThe shoesY maybe readilysubstltuted onefor the other since itis roo only` necessary to remove the center -capscrew ,.1

suchas 41-"`and 50 and the yoneshoe liftedfrom the seat formed in the `slide-block 'or sliding member and the otherlshoe thereon land the v'caps/crew reinserted through the bore therein andV secured homey. 1V .E f` l What is claimed is: v

`lz'In a device-of the class described, the-combination of a frame, a steady rest shoe carried thereby andpositionedbeneath a work piece'to take up the cut thrust of akv rotating tool, a'secoridsteady .restshoe carried by the frame positioned in opposition to the tool'to take up the lateral fthrust'' thereof, means vfor actuating one of4v the "shoes axially of itself includinga sliding member having rack teeth formed thereon, a

pivotally mounted pinion having the teeth thereoffengaging the-rack teeth, a lug extending from the pinion,v a slide bar engaging the lug and a screw for actuatingl the slide bar to rotate the pinion and adjust the sliding member, means for adjusting the remaining shoe axially of itself and meansl for guiding -the members during their movement. i I @2. In a'lmachine tool-organization, thecombination with a reciprocating table having a ledge Aformed thereon, `a rotatingI tooladapted to -be moved towardlthe tableya'frame member having a pair ofA apertured upstandingylugs, a clamp` bolt extending' -through each aperture, `an L shaped Y clampjfhead'on each bolt having-one leg thereof one beneath the work piece to take up the cut thrust of the rotating tool and the other positioned opposite the vtool to take up the lateral thrust thereof and means for axially shifting the shoes toward the axis of the work to maintain contact thereof with the surface of the work.

3. In asteady rest mechanism the combination of a frame, a sliding member mounted in the frame, a steady rest shoe secured to thev member, the said member having rack teeth thereon, a mutilated pinion for engagement with the rack, and means for actuating the pinion to axially adjust the sliding member and shoe.

4. In a steady rest mechanism the combination of a frame, a sliding member mounted in the frame, a steady rest shoe secured to the member, the said member having rack teeth thereon, a mutilated pinion for engagement with the rack, means for actuating the pinion to axially adjust the sliding member and shoe, said means comprisinga lug extending from the pinion, a bar guided in the frame and contacting the lug, and means for actuating the bar.

5. In a steady rest mechanism of the class described the combination of a frame, a pair of sliding members mounted in the frame for axial adjustment relative thereto through a denite stroke from a fully retracted position to a fully advanced position, a first pair of steady rest shoes removably securable to the members for movement therewith from the fully retractable position to the fully advanced positionand determining the band of diameters of work adapted to be supported thereby, individual adjusting means for each of the members and having a range of adjustment equal to the scope of movement of the members, and a second pair of steady rest shoes removably securable to the sliding members whereby adjustment of the members through the range of the adjusting means vdetermines a second band of work diameters to be supported thereby, which second band of diameters commences where the first band of diameters stops.

6. In a steady rest mechanism of the class described the combination of a frame, a pair of sliding members mounted in the frame for axial adjustment relative thereto through a definite stroke from a fully retracted position to a fully advanced position, a first pair of steady rest shoes removably securable to the members for movement therewith from the fully retractable position to the fully advanced position and determining the band of diameters of work adapted to be supported thereby, individual adjusting means for each of the members and having a range of adjustment equal tothe scope of movement of the members, and a second pair of steady rest shoes removably securable to the sliding members whereby adjustment of the members through the range of the adjusting means determines a second band of work diameters to be supported thereby, which second band of diameters commences where the rst band of diameters stops, each of the sliding members having formed therein a seat, and each of the shoes having formed thereon a seat complementary to the Y sliding member seats.

7. In a steady rest mechanism of the class described the combination of a frame, a pair of sliding members mounted in the frame for axial adjustment relative thereto through a definite stroke from a fully retracted position to a fully ,v advanced position, a rst pair of steady rest shoes Aremovably securable to the members for movement therewith from the fully retractable position tothe fully advanced position and determining the band of diameters of Work adapted to be supported thereby, individual adjusting means for each'of the members and having a range of adjustment equal to the scope of move- 'accurately positioning the shoes on the sliding members.

8. In a steady rest mechanism of the class described the combination of a frame, a pair of sliding members mounted in the frame for axial adjustment relative thereto through a denite stroke from a fully retracted position to a fully advanced position, a first pair of steady rest shoes removably securable to the members for movement therewith from the fully retractable position to the fully advanced position and determining the band of diameters of work adapted to be supported thereby, individual adjusting means for each of the members and having a range of adjustment .equal to the scope of movement of the members, and a plurality of pairs of steady rest shoes individually, removably securable to the sliding members whereby adjustment of the members through the range of the adjusting means determines additional bands o1' work diameters to be supported thereby, each of which additional bands of work diameter commences where the other stops.

FREDERICK S. HAAS.

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