US1991958A - Grinding machine - Google Patents

Description

Feb. 19, A NE GRINDING MACHINE Filed Maya, 1952 5 Sheets-Sheet 1 Feb. 19, 1935. M RQMAINE 1,991,958

GRINDING MACHINE Filed May 3, 1952 5 Sheets-Sheet 2 v F a 7 Feb. 19, 1935. M. ROMAINE GRINDING MACHINE Filed May 3, 1952 5 Sheets-Sheet 3 v MummRoMAm;

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Feb. 19, 1935. I M. ROMAINE 1,991,958

GRINDING MACHINE Filed May 5, 1932 5 Sheets-Sheet 4 aqua/whom MlLLARDKQMMNE Patented Feb. 19, 1935 GRINDING MACHINE Millard Romaine, Cincinnati, Ohio, assignor to Cincinnati Grinders Incorporated, Cincinnati, Ohio, a corporation of Ohio Application May 3, 1932, Serial 'No. 608,959

24 Claims.

This invention relates to improvements in machine tools and especially to improvements in grinding machines.

An object of the invention is the provision of g 5 an improved grinding machine of the centerless type particularly adapted for the grinding or fluishing of comparatively large, heavy work pieces.

Another object of the invention is the provision of improved feeding mechanism for actuating one of the parts of a grinding'throat to reduce the size of the said throat.

A further object" of the invention is the provision of improved means for placing work pieces in the grinding throat and removing same therefrom.

A still further object of the invention is the provision of improved means for disposing work pieces into position on a work loading and ejecting mechanism and positioning said work pieces within a grinding throat and withdrawing same therefrom.

Other objects and advantages of the present invention should be readily apparent by reference to the following specificationconsidered in conjunction with the accompanying drawings and it is'to be understood that any modifications may be made in the exact structural details there shown and described within the scope of the appended claims without departing from or exceeding the spirit of the invention.

In the drawings:

Figure 1 is a side elevation of the improved centerless grinding machine embodying the improvements of this invention.

Figure 2 is a plan view of the machine disclosed in Figure 1 and as particularly seen by looking directly into the grinding throat thereof.

Figure 3' is a fragmentary sectional view through the feeding mechanism as seen particularly from line 3-3 on Figure 1.

Figure v4 is a view partly in elevation and partly in section as seen from line 44 on Figure 1.

Figure 5 is a fragmentary sectional view taken 45 on line.5-5 on'Figure-4.

of Figure 5 showing a detail of the guide.

' Figure 7 is a sectional view taken on line 77 v of Figure 3.

on line 88 of Figure 1. v

Figure 9 is a fragmentary sectional view taken on line 9-9 of Figure 3. j

Figure 10 is adiagrammatic illustration of the 65 hydraulic circuit involved in the invention,

. therewith a work receiving trough in which is Figure 6 is a sectional view taken on line 66' H 38 and takes the grinding thrust of 'the' work- Figure 8 is a fragmentary. sectional view taken Figure 11 is afragmentary sectional view taken on line 1111 of Figure 2. Throughout the several views of the drawings similar reference characters are employed to denote the same or similar parts. v )5 T The machine illustrated in the drawings may comprise a bed 15 having the base lfi'fromwhich rises a column terminating in an outwardly'turned. I, support 17 to which is secured a grinding wheel head 18 and outboardsupport 19. The .h'ead18 10 has journaled therein a spindle 20 carrying ai grinding wheel 21, which spindle. 20 projects be a yond the wheel 21 and is journaled in theoutboard l support 19. The support 17 has mounted thereon f as at 22 a hood or cover 23 when substantially l encloses the grinding wheel 21 for conflnin gthe coolant usual with grinding machines. -The bed 15 further provides a suitable support-24 forming a dove-tailed guide 25 for guiding a truingrmechanism 26 during its traverse across the'active 20- face of the grinding wheel 21. The bed 15 has anoperativeinclined'face ex-r tending at an acute angle'tothe base 16 towhich is secured at a point adjacent the grinding wheel a pair of brackets 27 in'which are rotatably. jour 125: neled stud shafts 28; see Figure 4. The 'studm shafts 28 are each received in a pairbflu'gs or" ears 29 projecting downwardly from a bedplate' 30 and which ears straddle the brackets 2'1."- The bed plate 30 is provided on its upper surface with" 30. a dove-tailed guide 31 received in a similarly shaped guideway 32 formed on the under surface of a slide 33. The slide 33 in turn is-provided with a dove-tailed guide 34 receiving a correspondingly shaped guideway 35 formed" in the under surface of a slide 36. The slide '33 :will" hereinafter be termed thelower slide iandthe slide 36 the upper slide. The lower slide 33 is provided-at its forward end with a block 37in. which is mounted a blade 38 having an operative inclined surface 39 inclining in the generaldirec tion of the regulating wheel surface and-forming positioned the work piece 40 during the grinding operation. The work 40 is further inperipheral contactgwith the operativeface'39 off the blade while guiding and supporting it during'thesaid' grinding operation. In order to position {the .work on the'blade to position the work withre spect to the operative faces ofthef grindingfand regulating wheels the block 37 has secured to one end thereof abracket 41'having" journaled fin its one end a stud 421tofwh1chis secured fthe inner, race of an anti-friction I 5 ing the anti-friction end stop 44 that abuts against the fiat terminal end of the'work piece 40. As

shown in the drawings, the work piece in thishead 46 in which is journaled a spindle 47.. The

spindle 4'7 has secured to it a regulating wheel 48 adapted to engage the portion of the work being ground and through frictional engagement therewith control the rotation of the said work. For this purpose the regulating wheel 48 is rotated at a comparatively slow work rotation controlling rate of speed by means of a motor 49 which has secured to its shaft 50 a sprocket chain gear 51. Trained about the sprocket 51 is a-gear chain 52 which is in turn trained about a similar sprocket 53 secured to a worm. shaft 54 for rotating a worm 55 formed thereon or secured thereto. The worm 55 meshes with a worm wheel 56 secured to the regulating wheel spindle 4'7.

From the foregoing it will be noted that the grinding wheel and regulating wheel have their operative surfaces spaced from one another a distance to form a grinding throat that is subtended by the work rest blade. During the grinding operation the work is simultaneously in engagement with the grinding wheel, regulating wheel and work rest blade. The grinding wheel is rotated at a high grinding rate of speed to effect a stock removal from the work while it is peripherally supported by the angle top of the work rest blade and the rotation of the work is frictionally controlled through its engagement with the regulating wheel.

In order to feed the work into the grinding wheel the bed plate 30 is formed at its end opposits to that from which the lugs 29 project with ears 5'7 and 58 having formed therein in axial alignment perforations receiving a pivot pin 59. Supportegrby the pivot pin 59 is a clevice 60 receiv-. ing in a t eaded perforation therein one end of a push rod 61 which extends transversely of the bed terminating in a feed box 62 secured to the rear of the bed 15 and shown indetail in Figure 3. The feed box 62 may be secured to the bed in any desirable manner, here shown as by means of bolts 63. The rear wall of the bed 15 and the adjacent wall of the feed box 62 have formed through them in axial alignment a perforation in which is mounted a guide bushing 64 that encircles a reduced portion 65 of the feed rod 61. The bushing 64 has projecting from it fingers 66 through which extends a pin 6'7 having mount ed thereon an anti-friction roller 68 straddled on opposite sides by the fingers 66. The roller 68 contacts with the inclined wedge cam face 69 of ;a wedge cam feed member '70. Diametrically opposed to the cam face 69, the feed member '70 is provided with a slot '71 providing a fiat true face '72 in contact with the anti-friction roller '73 mounted on a pin '74 carried by fingers '75. The fingers '75 are joined at their rear ends by means of a plug member '76 that is secured in the rear wall of the feed box housing 62 to align the anti-friction roller 73 with the anti-friction roller 68 to engage the feed member '70 therebetween.

The feed member '70 has secured to its one end one end of a piston rod '77 which passes through a stufllng box '78 forming one head for a cylinder 79 .and whereby the said cylinder is secured to one of the lateral siclesof the feed box 62 so that said cylinder may project beyond the said box. En-

closed within the cylinder '79 is a piston 80 secured to the end of the rod '77 within the cylinder '79. The other end of the cylinder '79 is closed by a cylinder head 81. The piston 80 is actuated relative to the cylinder '79 by means of hydraulic pressure for shifting the feed member '70 relative to the rollers 68 and '73, which due to the inclined wedge face of the member '70 axially adjusts or actuates the push rod 61- and oscillates the-bed plate 30 about the pivot studs 68' and thereby feeds the work carried by the blade into the grinding wheel.

For introducing pressure to the opposite ends of the cylinder '79 the stufllng box or cylinder head '78 has formed therein a. port 82 to which one end of a pipe or conduit 83 is secured. Similarly the piston head 81 has formed therein a port 84 for one end of a pipe or conduit 85. The other ends of the pipes 83 and 85 respectively terminate at ports 86 and 87 formed in a casing 88 that encloses a valve sleeve 89 having ports therein,

which register with the ports 86 and 8'7. The valve casing 88 is further provided with ports 90, 91 and 92 respectively in alignmentwith the ends of pipes or' conduits 92a, 93 and 94 which are respectively exhaust, infeed and exhaust conduits. As shown diagrammatically in Figure 10, themessure conduit 93 is connected at its other end with a pump 95 adapted to take oil through suction pipe 96, contained in tank or sump 9'7, and discharge same under pressure into the said pressure line 93. The pipes or conduits 92a and 94 are joined in a single exhaust or return line 98 that terminates in the tank 9'! for returning the spent hydraulic medium or oil to the tank or sump 97.

providing reduced portions therebetween. As

shown in Figure 10, the pressure line 93 is connected with the pipe or conduit 83 for delivering the hydraulic medium to the left hand face of the piston 80 thereby driving said piston to the right carrying with it the member '70. Simultaneously the pipe or conduit 85 is connected with the pipe or conduit 94 for delivering the hydraulic medium ahead of the piston 80 to the tank or sump 97. It will be readily evident thatby shifting the valve 99'to the right, as seen in Figures 3 and 10, the pressure in the conduit 93 will be cut off by means of the valve head 100 from the conduit 83 and connected with the conduit 85 thereby causing the pressure to act on the right hand face of the piston 80 for driving the same to the left. Simultaneously with the movement of the valve 99 the head 100 will connect the conduit 83 with the exhaust pipe or conduit 92a and thereby deliver the hydraulic medium to the tank or sump 9'7.

As seen in Figure 3, the valve 99 has projecting from its right hand end a bar or extension 104 which is in axial alignment with an adjustable bumper 105 projecting from the adjacent end of the feed member 70. The bumper 105 conveniently takes the form of a bolt being provided with a lock nut 106 for securing the bolt in adjusted position. The bumper 105 is adjusted in axial position for engaging the end of rod 104 and shifting the valve 99 to the left to thereby automatically efi'ect reverse actuation of the piston 80. It will be understood that the movement of the valve 99 to the left will gradually cut oil the flow of medium through the port 8'7 and, unless the momentum, is considerable, will eventually stop the flow through the port 8'7 and stop further ther movement of the piston 80. To avoid this,

' the valve, as seen in Figure 9, is provided with a pair .of cam grooves 107 and 108 each having their sidewalls inclined and co-operating with a spring pressed load and fire dog 109.. From this it will be seen that it is only necessary to shift the valve 99 an amount sufllcient to cause the cam point of the load and fire dog 109 to ride up the intermediate wall of the grooves 107 and 108 which compresses or loads the spring 110 of the dog 109. As soon as the apex of the said inclined wall is reached, the spring expands: or fires the dog 109 which through cooperation of its cam point and the cam or inclined wall of the groove 107 completes the shifting of 4 the valve 99 in the proper direction.

To shift the valve 99 to the right, it is provided'on its left hand end with a head 111 adapted to be engaged by a roller 112 rotatably mounted in one end of a bell crank 113 pivoted at the junction of its arms at 114 to a bracket 115 projecting from the lateral side of thefeed casing 62. The other arm of the bell crank 113 is pivoted at 116 to one end of a valve actuating rod 117 extending along the side of the bed to the front end thereof. The rod 117 as seen in Figure 1, has its other end pivotally connected at 118 to an arm 119. The am 119 is part of a bell crankhaving integral therewith the arm 120 which forms a foot treadle 121. The arms 119 and 120 are pivoted at 122 to a suitable portion of the base 16. A spring 123 has its one end secured to the arm 119 and its other end anchored to the bed 15 for oscillating the foot treadle 121 in a counter-clockwise direction and thereby keeping the said treadle elevated and the roller 112 out of reach of the valve-99 as it is shifted by the member 70 and load and fire dog. From the foregoing it will be noted that order to feed the work into the grinding wheel after it is mounted on the blade, it is simply necessary for the operator to depress the foot treadle 121 for shifting the valve 99 to the right as seen in Figure 3. It is to be understood that at this time the piston is at the other end of the cylinder 79 from that shown in Figure 3 so that the bumper 105.is remote from the end 104 of the valve 99. It is also to be understood that it is only necessary to shift the valve 99 to the right a sufficient distance to cause the load and fire dog to rise to the apex of the inclined cam grooved walls whereupon the said dog will complete the shifting of the valve. As soon as the valve has been shifted the-piston 80 starts toward the left thereby shifting the feed member 70 in a corresponding direction. The inclined wedge face 69-which, as shown-in Figure 3, inclines down-- wardly from the left hand end thereof, gradually forces the roller 68 outwardly, or to the right, as seen in Figure 1, thereby through the rod 61 oscillating the bed plate and the parts carried thereby about the axis of the pivot shafts 28. This feeding of the work into the grinding wheel continues until the end of the feed member or the bumper 105, carried thereby, engages the valve rod 104 1 125. The screw 125 has in threaded engagement therewith a nut 126 having formed on its outer surface a spiral gear 127 meshing with a spiral gear 128 on 'the end of a transverse shaft 129.

The nut 126 and shaft 129 are rotatably mounted against axial'movement in the upper slide 36, the latter being carried on anti-friction bearings. mounted in lugs or arms 130 projecting upwardly from the said slide 36. The outer end of the shaft 129 has secured to it a bevel gear 131 meshing and jointly actuated, they are respectively provided with a clamp 137 and 138, the former being associated with the lower slide whereby it maybe clamped to the has ,plate while the upper slide is adjusted relative thereto, and the latter being carried by the up per slide for securing same to the lower slide which upon release from the base plate permits the unitary actuation or adjustment of the slides. The foregoing manually operated mechanism is also utilized for initial set up of the parts of the'machine.

To assist in the changing'of the wheels, which are of a considerable width and weight, the bed or column 15 has projecting from its rear wall a bracket 139 forming a swivel base and receiving the reduced end 140 of a bar 141. The bar 141 passes through a bearing 142 on the end of an arm 143 carried by the upper or gooseneck end of the bed or column 15. Secured to the upper end of the bar 141 is a beam 144 which may conveniently take the form of an iron I-beam for forming tracksand guide for a trolley 145 mounted thereon. The trolley 145 has a hook 146 associated therewith.- The operation of the crane just described is readily apparent from an inspectionpf Figure 1.

The work, as noted above, is a munition shell and is of considerable weight making it next to impossible to manually dispose the work in position for mounting in the grinding throat, wherefor there is provided a conveyor for delivering the work to the machine. Any type of conveyor may distance apart and carrying a plurality of roller pins or shafts 149. The said pins or shafts 149 each support a freely rotating roller or barrel 150 upon which the work is mounted and manually actuated or moved, which work, due to the roll or rotation thereof is transferred, from one roller 150 to the next.

In alignment with the thrb'atorjthe machine,

as particularly shown in Figure 1, there is provided a frame comprising side members 151 and 152 being joined at their outer ends by a brace or bracket 153 and having their inner ends respectively secured. to brackets154j secured to the upper slide at a point adjacent the'work restblock 37. The brace 153 has secured to its under surface a furcated bracket 155 having aligned apertures in its arms through which a pivot pin 156 extends. Encircling the pin 156 is the eye of a strut or brace 157 having its lower end threaded as at 158 andreceived in a nut 159. The nut 159 has integral therewith a hand wheel 160 whereby the said nut is rotated and the nut rests on a swivel member 161 swiveled in the bracket 162 which rests on the base or support for the machine base 16. From this it will be noted that the frame 151 and 152 is adapted to be adjusted as respects the bed of the machine and the upper and lower slides to at all times maintain the proper relationship between the work and wheels.

The frame 151-152 supports a work loading and ejecting slide 163 adapted to be positioned at the upper end of the frame for receiving the work and carrying same into the grinding throat.

' The slide 163 is provided on opposite sides with therefrom on opposite sides thereof.

of studs 188 and 189 are respectively carried by rack member 164 meshing with a pinion 165 secured to a shaft 166 journaled in the frames 151 and 152. The shaft 166 has secured to it exteriorly of the frame member 152 a hand wheel 167 whereby the said shaft is rotated for causing the slide to be traversed from its outer work receiving position to a position within the grinding throat. The slide 163 has the rack members 164 connected by a bridge 168 to which is'pivoted an L-shaped lever 169, the pivot 1'70 passing through the lever at the juncture of the legs of said lever. The leg 1'71 of the lever 169 is provided with a counterbore 1'72 and reduced perforation 173 in axial alignment with the counterbore 1'72. The stud 1'74 has one end threaded into the bridge 168 and passes through the counterbore 1'72 and aligned perforation 1'73 and receives lock nuts 1'75 on the end exteriorly of the leg 1'71. A spring 1'76 encircles the stud 1'74 abutting on one end with the bridge 168 and on the other end with the base of the counterbore 172. The other leg 17'? of the lever 169 carries a pivot 178 for a roller 180 which is adapted to be held in contact with the work during the actual grinding operation.

The lower end of the slide 163 is provided with a cross strut 181 having its upper surface 182 formed at an angle to the direction of extent of the slide 163. The strut 181 has let into it a plurality of roller studs 183 each being encircled by a roller 184 and supporting the work against the yielding urge of the spring 1'76 and roller 180 prior to the engagement of the work with the angle top 39 of the work rest blade 38.

To assist in mounting the work on the slide 163 and for transferring same from the conveyor to the said slide, the frame members 151 and 152 are joined intermediate their ends by a block 185 having arms 186 and 187 projecting upwardly A plurality the sides 186 and 187 and between each pair of opposed studs 188 and 189 is disposed a roller 190 which is in alignment with the work conveyor and receives the work from the conveyor rollers 150 for positioning it between the pressure roller 180 and the carrying rollers 184.

To hold the slide in its inner and outer positions it is provided with a pair of slots 191 and 192 adapted to individually co-operate with a latch 193 formed on one surface of a lever 194 pivoted at 195 to the frame member 152. The notch 191 receives the latch 193 when the slide 163 is in its inner position, as shown in Figure 5, and prevents any movement of the slide during the grinding operation. In order to with draw the work from the grinding throat the latch 193 is lifted from the slot 191 and the hand wheel 167 actuated in a clockwise direction, as

seen in Figure 5, thereby shifting the slide 163 within the said notch for holding theslide. in

position to receive a work piece from the conon, a work support, and means pivotally securing the work support to the bed, of means longitudinally actuable for oscillating the work support about its pivotal mounting for feeding the work into the grinding wheel, said means comprising a wedge-shaped cam, a follower .for the cam, a connection between the follower and work support, and hydraulically actuable means for axially adjusting the wedge-shaped cam.

2. In agrinding machine the combination with a bed, a grinding wheel rotatably mounted thereon, and a work support pivotally connected to the bed for oscillation toward and from the grinding wheel, of hydraulically actuable means for oscillating said work support including a valve, and foot treadle control means for shifting the valve in one direction to oscillate the work support toward the grinding wheel.

3. In a grinding machine the combination with a bed, a grinding wheel rotatably mounted thereon, and a work support pivotally connected to the bed for oscillation toward and from the grinding wheel, of hydraulically actuable means for oscillating said work support including a valve, foot treadle control means for shifting the valve in one direction to oscillate the work support toward the grinding wheel, and automatic means for shifting the valve in the other direction.

4. In a grinding machine of the class described the combination with a bed, a grinding wheel rotatably supported thereby, and a work support pivotally mounted on the bed for oscillation toward and from the grinding wheel, of a wedgeshaped cam, an operative connection between the cam and the work support, an hydraulically actuated piston for reciprocatingthe cam and thereby oscillating the work support, an hydraulic medium for actuating the piston, a valve controlling the fiow of the medium, and a foot treadle for shifting the valve in one direction.

5. In a grinding machine of the class described the combination with a bed, a grinding wheel for shifting the valve in one direction, and

means carried by the cam for actuating the valve in the other direction to reverse the flow of the hydraulic medium.

6 ma grinding machine of the class described the combination with a bed, a grinding wheel rotatably supported thereby, and a work support pivotally mounted on the bed for oscillation toward and from the grinding wheel, of a wedgeshaped cam, an operative connection between the cam and the work support, an hydraulically actuated piston for reciprocating the cam and thereby oscillating the work support, an hydrau- Iicmedium for actuating the piston, a valve controlling the flow ofthe medium, a foot treadle for shifting the-valve in one direction, means -;--ean'ledby;the camior actuatingthevalve time its withdrawn position, and means carried by the :other direction to reverseIth'esHoWot the hyframe co-operating with the slide -!or holding :draullcmedi m and-aload and fire mechanism in its withdrawn and loading positions. operable, upon; shifting of v thevalve for com- I I 11. In a centerless grinder of the class described :--:pleting itsmovement when actuated by the valye the combination or a bed, a grinding wheel rotat- 5 actuator-on the 1 I ably mounted thereon, an opposed regulating .7. Ina centerless grinder oi the class described wheel, the grinding and regulating wheels tormthe, combinationwith abed, a grinding wheel lO ing a grinding throat between them, a work rest .1 tatablymounted thereon for rotation rate high blade subtending the grinding throat, means for owgrindlng rate'of speed, an opposed regulating supporting one or the wheels for adjustment relal0 v., Pwheel-rotatableat arelatively slow' work rotative to the other and relative to the work rest tion controlling rate of speed, the grinding and blade, means for supporting the work rest blade regulating wheels forming a grinding throat for adjustment relative tothe bed and the grindtherebetween, a work rest blade subtending the ing and regulating wheels, means pivotally atgrindingthroat, and means pivotally supporting taching the wheel and work rest blade supporting l5 the work rest blade and regulating 'wheelon the means to the bed for oscillation relative thereto, ed for oscillation-toward and from the grindand hydraulically actuated mechanism having an King wheeL-ot hydraulically actuablemeans for operative connection with the pivotal connecting ,eflecting-theoscillation of the work support and means for eflecting the oscillation of said wheel 2 regulating wheel, said means comprising a wedge and work rest blade. Y cam t d tobe axially adjusted, and an hy- 12. In a centerless grinder of the class described draulically actuated piston associated with the the combination of a bed, a grinding wheel rocam'for-actuatingsameg tatably mounted thereon, an opposed regulating 8,111 acenterless grinder of the class described wheel, the grinding and regulating wheels formthe combination. with a bed, a grinding wheel roing a grinding throat between them, a work rest 25' tatablymouiited thereon for rotation at a high blade subtending the grinding throat, means for grinding, rate .01; Speed, an opposed regulating supporting one of the wheels for adjustment relwheel rotatable'at a relatively slow work rotation ative to, the other and relative to the work rest 1 controlling rate of speed, the grinding and regublade, means for supporting the work'rest blade latingwheels forming a grinding throat therebefor adjustment relative to the bed and the grind- 30 tween, awork rest blade subtending the grinding ing and regulating wheels, means pivotally atthroat, means pivotally supporting the work taching the wheel and work rest blade supporting rest bladeand regulating wheel on 'the bed for" means to the bed for'oscillation relative thereto, oscillationj toward and from the grinding wheel, and hydraulically actuated mechanism having an ofhydraulically actuablem'eans for effecting the operative connection with the pivotal connecting oscillation of the work support and regulating means for effecting the oscillation of said wheel ,,.-wheel, said means comprisinga wedge cam adaptand work rest blade including a reciprocable ed .t'obe axially adjusted, arihydraulically actuwedge type cam, a piston connected with the cam, l, ated piston associated with the cam, an hydraulic and a valve controlling an hydraulic medium for I? medium foractuating the piston, a valvecontrolactuating the piston. 40

ling thejfiow of the,,-medium, and foot treadle 13. In a centerless grinder of the class described 1' eans. for; aotuating' the'valve for initiating a 'the combination of a bed, a grinding wheel rotatmovement or the piston and wedge cam to eflect ably mounted thereon, an opposed regulating r the o'scill'ation of the work and regulating wheel wheel, the grinding and regulating wheels formi5j,toward thegrinding wheel; I, ing, agrindingthroat between them, a workrest f," 9. lnacenterlessgrinderot the class described blade subtending the grinding throat,'means for "the combination of a pair of opposed grinding and supporting one of the wheels for adjustment relaregulatingfwheels, forming a grinding throat tive to the other and relative to the work rest u I therebetween, "means supporting one of said blade, means 'for supportingthe workjrest blade I10 wheels forfoscillatory movement toward and from foradjustment relative to the bed and the grindthe nthe'r,laworkrestbladesubtendingthe grind in and-r ulat n wh m s, p v ta tj ingjthroau'aj slide movablelaterally of the grindtaching the wheel and work rest blade supporting I in throat! disposing a .work piece arr-and remeansto the bed for oscillation relative thereto, movin' g' s ame ifrom th'e blade, carrier rolls supand hydraulically actuated mechanism'having an "portedjby' the slide to'iacilitate mounting of the. operative connection with the pivotal connecting workonthejslide, ayieldable pressure roll on the means for effecting the oscillation of said wheel lidegiorfyieldably holding the work in contact and 'work rest blade including a reciprocable with,t 'l e; and' means for shifting the slide wedge type cam, a piston connected with the cam, into, and rut'oijthegrindingthroat. a valve controllingan hydraulic medium for ac- 110.,111 ce terie s grinder or the class described ma n hepi n and m ans f r placing a work so '1tnejec timiioaprapart: opposed grinding and piece on the work-rest blade and withdrawing gqlating whgel firming a, grindi throat same therefromincludinga slide laterally shifted therebetwe enff'meang suppt rting "one of said relative to the grinding throat.

, wheelj sjff or oscillatory movement toward'andfrom "14. In a centerless grinder of the class dethepthe'r; aw

1r tb a esubt dingthegrmdscribed the combination of a bed, a grinding I I H emovable laterally of the grindwheel" rotatably mounted thereon, an opposed iiigt "oat fordisposing ra work piece on and re-'; regulating W the i g and regulating m'qvirigi"s ame from the bladefcarrier "rolls up-' wheels forming a grinding throat between them, byftha slide to facilitate mounting of the a work rest blade subtending the grinding throat, theslide, a yieldable pressure roll on the ,means for supporting one of the wheels for adto yiel'dably' 'holding' 'the 'work in contact fjustment relative to the other and relative to the 1aae,;mea sror shifting the slide into work rest blade, means for supporting the work thejgrinding'throaa'a 'Irame'slidably frest blade for adjustment relative to the bed and ort e'slide, rollers on the frame adapted the grinding and regulating wheels, means pivgned with the sli when the slide is in tally attaching the wheel and work rest by supporting means to the bed for oscillation relative thereto, and hydraulically actuated mechanism having an operative connection with the pivotal connecting means for effecting the oscillation of said wheel and work rest blade including a reciprocable wedge type cam, a piston connected with the cam, a valve controlling an hydraulic medium for actuating the piston, and means for placing a work piece on the work rest blade and withdrawing same therefrom including a slide laterally shiftedrelative to the grinding throat, and conveyor means for conveying the work pieces to the slide.

15. In a grinding machine of the class described the combination with a bed, and a wheel head pivotally mounted thereon for oscillation relative thereto, of an axially shiftable member having a cam face thereon for movement relative to the wheel head, means between the cam face and wheel head for effecting oscillation of said wheel head as the member is moved, and lggdraulic means for axially actuating the mem- 16. In a grinding machine the combination with a bed, and a wheel head pivotally mounted on the bed for oscillation relative thereto and including a slide for adjusting the wheel head relative to its pivotal mounting, of hydraulically actuable means carried by the bed for movement relative thereto for oscillating the wheel head.

1'7. In. a centerless grinder of the class described the combination of a column having an operative supporting portion disposed in a substantially vertical plane, a grinding wheel rotatably supported by the column at one end of the supporting portion,,an oscillatable support pivotally secured to the supporting portionof the column, a slide on the support, a regulating wheel rotatably mounted on the slide in opposition to the grinding wheel and forming therewith a grinding throat, means for actuating the slide relative to the support toward the grinding wheel to vary the size of the grinding throat, and means for actuating the support and slide about the pivotal connection of the slide toward and from the grinding wheel to effect a stock removal from the work within the throat.

18. In a centerless grinder of the class described the combination of a column having an operative supporting portion disposed in a substantially vertical plane, a grinding wheel rotatably supported by the column at one end of the supporting portion, an oscillatable support pivotally secured to the supporting portion of the column, a slide on'the support, a regulating wheel rotatably mounted on the slide in opposition to the grinding wheel and forming therewith a grinding throat, means for actuating the slide relative to the support toward the grinding wheel to vary the size of the grinding throat, means for actuating the support and slide about the pivotal connection ofthe slide toward and from the grinding wheel to effect a stock removal from the work within the throat, and a work rest sub-tending the grinding throat'peripherally supporting a work piece while disposed within the throat.

19. In a centerless grinding machine of the class described the combination of a vertically disposed column having a supporting portion disposed in a plane forming an obtuse angle with the horizontal, a grinding wheel rotatably secured to the column at one end of the supporting portion of the column, a work rotation and control mechanism on the column and including a regulating wheel opposed to the grinding wheelv and forming a grinding throat there between, means pivotally securing the work rotation and controlling mechanism to the supporting portion of the column, hydraulic means for effecting an oscillatim of the work supporting and controlling mechanism toward and from the grinding wheel and in' cluding a control valve therefor, manual means for actuating the valve in one direction to effect an oscillation of the work controlling and supporting mechanism toward the grinding. wheel, and automatic means for shifting the valve in the opposite direction and effecting an opposite oecillation of the mechanism.

20. In a centerless grinding machine of the class described the combination of a vertically disposed column having a supporting portion dieposed in a plane forming an obtuse angle with the horizontal, a grinding wheel rotatably secured to the column at oneend of the supporting portion of the column, a work rotation and contrd a mechanism on the column and including a regulating wheel opposed to the grinding wheel and forming a grinding throat there between, mean pivotally securing the work rotation and controlling mechanism to the supporting portion of the column, hydraulic means for effecting an oscillation of the work supporting and controlling mechanism toward and from the,grind1ng wheel and including a control valve therefor, apivotally mounted foot treadle associated with the machine, a connection between the treadle and valve whereby the valve is actuated in one direction by the foot treadle to effect an oscillation of the work supporting and controlling mechanism toward the grinding wheel, and automatic meal for reversely shifting the valve and effecting a reverse actuation of the mechanism.

21. In a centerless grinder of the class described the combination of, a bed, a pair 0! opposed grinding and regulating wheels formirI a grinding throat there between, a work support sub-tending the grinding throat and peripherally engaging the work during the grinding operation, a slide shiftable laterally of the grind! throat for placing work within the throat and removing same therefrom, work engaging menu on the slide for engagement with the work during the movement of the slide into and from t! throat, said means comprising rollers rotatable about axes at right angles to one another whereby the work engages a roller rotatable in a direction in which the work is shifted while heir positioned on and removed from the slide and whereby the work is engaged by a roller rotatable in the direction of rotation thereof durlII the grinding operation, means pivotally mounting the last mentioned roller for oscillation toward and from the work, and yielding means for shifting said last mentioned roller toward the work to maintain contact of the work with the peripheral support during the grinding operation.

22. In acenterless grinder of the class described the combination of 'a bed, a pair (I opposed grinding and regulating wheels forum a grinding throat therebetween, a work support sub-tending the grinding throat and peripheralb engaging the work during the grinding operation, a slide shiftable laterally of the grind! throat for placing work-within the throat and removing same therefrom, work engaging meal on the slide for engagement with the work during the movement of the slide into and from the throat, said means comprising rollers rotatable about axes at right angles to one another whereby the work engages a roller rotatable in a tile 1| rection in which the work is shifted while being positioned on and removed from the slide and whereby the work is engaged by a roller rotatable in the direction of rotation thereof during the grinding operation, means pivotally mounting the ing throat for effecting a shifting of the workon the slide.

23. In a centerless grinder of the class described the combination of a bed, a pair of opposed grinding and regulating wheels forming a grinding throat there between, a work support sub-tending the grinding throat and peripherally engaging the work during the grinding operation, a slide shiftable laterally of the grinding throat for placing work within the throat and removing same therefrom, work engaging means on the slide for engagement with the work during the movement of the slide into and from the throat, said means comprising rollers rotatable about axes at right angles to one another whereby the work engages a roller rotatable in a direction in which the work is shifted while being positioned on and removed from the slide and whereby the work is engaged by a roller rotatable in the direction of rotation thereof during the grinding operation, means pivotally mounting the last mentioned roller for oscillation toward and from the work, yielding means for shifting said last mentioned roller toward the work to maintain contact of the work with the peripheral support during the grinding operation, a supporting frame for the work slide, means for actuating the slide relative to the frame from a position outside of the grinding throat to a position within said throat, rollers carried by the frame at the point where the slide is outside of the grinding throat for effecting a shifting of the work on the slide,

and conveyor means in line with the frame rollers for conveying work pieces thereto and therefrom.

24. In a machine tool organization the combination of a bed, a tool support, a work support, means pivotally connecting one of said supports to the bed for oscillation relative thereto toward and from the other, cam means for effecting the oscillation of said support, a hydraulic motor for actuating the cam, a hydraulic circuit for controlling the movement of the motor including a control valve, manual means for shifting the valve in one direction, yielding means for shifting the said valve in the other direction, means for latching the valve in the position effected by the manual means, and, automatically operable,

means for unlatching the valve to permit its operation by the yielding means.

. MILLARD ROMAINE

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