US2000216A

US2000216A - Grinding machine

Info

Publication number: US2000216A
Application number: US678589A
Authority: US
Inventors: Gustave A Carlson
Original assignee: Individual
Current assignee: Individual
Priority date: 1933-07-01
Filing date: 1933-07-01
Publication date: 1935-05-07
Anticipated expiration: 1952-05-07

Description

May 7, 1935.

G. A. CARLSON GRINDING IVIACI'IIINE Filed July 1, 1953 4 Sheets-SheetI 2\ /g INVENTOR.

g? aw i ATTORNEY.

May 7, 1935. G. A. CARLSON GRINDING MACHINE Filed July l, 1953 4 Sheets-Sheet 3 f INVENTQR.

BY A v A ORNEY..

May 7, 1935- G. A. CARLSON 2,000,216

GRINDING MACHINE Filed July 1, 1933 4 Sheets-Sheet. 4

M N m i w v@ 1N VENTOR.

ATT RNEY.

Patented May 7 1935 A UNITED STATES PATENT OFFICE 32 Claims.

My invention relates to improvements in grinding machines in which a grinding wheel operates in conJunction with a movably operated mechanism for holding the object or workto be ground; and the objects of my improvements are, first, to

`provide a grinding machine in which the object to be ground may be revolved and also moved along a predetermined path to form the shape of the ground surfaces; second, to provide a. grinding machine having a reciprocating carriage actuated to move with varying rates of speed throughout its stroke; third, to provide a grinding machine having a reciprocating carriage supporting an oscillating head mechanism for supporting the object to be ground; .fourth, to provide a grinding machine having an oscillating head mechanism mounted on a reciprocatingly and oscillatory operated mechanism; vilfth, to provide a grinding machine with means for resiliently actuating the object to be ground toward the grinding member; sixth, to provide a grinding machine with a'cam controlled mechanism for varying the reciprocating movement of the object to be ground to form the shape of the ground surfaces; seventh, to provide a cam mechanism for partially supporting a reciprocated carriage member for supporting the object to be ground;

- eighth, to provide a pivotally supported cam mechanism to permit the object to be ground by a grinding machine to be readily moved to and from the grinding member to provide operating clearance when inserting or removing the object to be ground; ninth, to provide a pivotally mounted mechanism for manually moving the object to'be ground, in a grinding machine; from the grinding member, with means for automatically returning the pivotally mounted mechanism to a position in which the object will be in a position to be ground by the grinding member; tenth, to provide a grinding machine with a revolvably mounted chuck having a resiliently actuated clamping mechanism for receiving the object to be ground therethrough; eleventh, to provide a grinding machine having a 'revolvably mounted chuck for holding the object to be ground, with means for decelerating or stoppingthe revolvable motion of the chuck; twelfth, to provide a grinding machine having a resiliently actuated chuck for holding the object to be ground, with means for varying the pull of the resilient mechanism to exert-.varying thrusts oi the object against the grinding member at predetermined points in the travel ofthe object adjacent the grinding member; thirteenth, to provide a grinding machine having a carriage reciprocatingly operated by a revolving cam member having an irregular outline to provide varying ratesof speed throughout the stroke of the carriage; fourteenth, to provide a grinding machine having an individual power unit for operating its chuck, grinding member, and carriage for supporting the chuck; fteenth, to provide a grinding machine having a reciprocating carriage operatively controlled to reverse its movement at one end of its stroke and to terminate its movement at the other end ofits stroke; and sixteenth, to provide -a grinding machine having an electric motor as its head or head stock member with means for adjusting the position of the electric motor longitudinally, transversely 'and radially in a horizontal plane.

I attain these objects by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is a plan view of the grinding machine; Fig. 2, a side view of the grinding machine; Fig. 3, a plan view of the cam mechanism for guiding. the movement oi the chuck for supporting the object to be ground relative to the grinding wheel; Fig. 4, a side elevation of the cam mechanism disclosed in Fig. 3; Fig. 5, a sectional view through one of the stop members on the cam -mechanism, disclosed in Fig. 3 taken on the line 5 5, Fig. 3; Fig. 6, a partial view of the grinding machine and with its cover member partially removed to disclose a portion of the reciprocating carriage together with its operating cam mechanism; Fig. 7, a partial sectional vview taken on the line 1-`l, Fig. 6, together withthe cam driving mechanism; Fig. 8, a partial sectional view o! a skillet and the grinding wheel in its operative position relative to the skillet; Fig. 9, a side view oi' the chuck for holding a skillet to be ground and with askillet therein, together with a portion of the chuck operating shaft and its supporting mechanism: Fig. 10, an end view of the chuck and the skillet disclosed in Fig. 9; Fig. 11, a plan view of the chuck and the skillet disclosed in Fig. 10; Fig. 12,'an end view of the electric motor and the mechanism for driving the chuck for holding the skillet; Fig. 13, a plan view of the end portion of the guiding arm and its guide member for engaging its cooperative cam mechanism; Fig. 14, an end view of the portion of the guiding arm and guiding member disclosed in Fig. 13; Fig. 15, a plan view of a 50 portion ofthe vchuck supporting and driving mechanism; Fig. 16, a partial sectional view taken on the line I 8-i-6, Fig. 15; Fig. 1'1, an end view of the brake mechanism; and Fig. 18, a wiring diagram disclosing schematically the various elec- -55 column, pedestalfor housing 4, and the cam mechanism supporting column, pedestal or housing 5,

said

columns

3, 4 and 5 being located angularly' relative to one another. The

housings

3, 4, and 5 may be suitably connected by the rib member 5 for reinforcing purposes. The column 3 is provided with the bed 1 which is provided with the ways or V portions 3 in which is slidably mounted the cross slide 3, the cross slide 3 being ad-l justably moved in a conventional way by the shaft II which threadably engages the boss I3 of the cross slide 9, the shaft II being revolvably operated by the hand wheel I2, thus providing adjustable movement, in a transverse direction relative to the column 3, for the cross slide I3 which is slidably mounted to move longitudinally relative to the cross slide 3, the cross slide I3 being mounted in the ways or V portions I4 of the cross slide 9. The crossslide I3 is operated by the shaft I5 which threadably engages the boss I6 of the cross slide I3, the shaft I5 being revolvably operated by the handwheel I1. The housing member I3 is secured, by the screws I3 and 2| to the cross slide I3 and is adapted'to move therewith. The cross slide I3 is provided with the slot 22 which is located radially relative to the screw I9, the screw 2I extending through the slot 22 to-permit the housing `I3 to be adjustably Vmoved radially about the center of the screw I3,

thus providing radial adjustment for the housing I8 together with the electric motor assembly A which is secured to the housing I3 by the screws 23. Additional screws, such as 24 may be used to secure the housing I3 to the cross slide lI3, in which case an additional radial slot 23 is provided in the housing I3 to engage the screw 24.

The electric motor assembly A'is provided with the armature shaft 33 which is extended outwardly from the electric motor assembly A to provide proper operating space and the grinding wheel 3i is suitably mounted at the outer end 'of said shaft 33 and is secured by the nut 32.

1t is to be noted that my grindine machine is.,

adapted for performing .grinding operations on a great variety of.v objects or different kinds of work and makes possible, as hereinafter disclsed, the grinding of different kinds of work inja.j very quick, emcientfand easy way which is especially advantageous where the object or work is such as can only be produced and marketed 'at a ,very low or minimum cost.. As an example of'such objects or work, I have disclosed my grinding machine as being'used for grinding the inner bottom surfaces 33 and the inner flange surfaces 34 of a skillet or spider 35 whichmay be constructed, as by casting, with the lips or ared

portions

33 and 31 which are used as a spout for pouringn be produced with a finished surface condition in the quickest possible time and at the lowest possible cost in order to profitably produce such an object because the inherent nature of such objects preclude any excess charges even though they are small. Therefore I have disclosed my grinding machine as operating on a skillet for which it is especially adapted and from such a disclosure it will be readily apparent that my grinding machine can be easily adapted to a great variety of objects without departing from the spirit and scope of my invention.

Figure 8 discloses a sectional portion of the skillet 35 together withthe grinding wheel 3l located adjacent the radius or corner 39 of the skillet 35, the grinding wheel 3| being constructed with a shape to conform to the surfaces of the object or work to be ground. In the instance of the skillet 35, the grinding wheel 3I will be provided with the surface 40, which, ashereinafter disclosed, is adapted to grind the surfaces 33 as the skillet 35 is operatively moved, the grinding wheel 3I being further provided with the surface 4I which may be provided with a clearance space 42, the surfaces 4II and 4I being located angularly relative to one another to form the desired radius or corner 39, the grinding wheel 3I being further adapted to grind the surface 34 as the skillet 35 is operatively moved, as hereinafter disclosed. The skillet 35 is supported, during the grinding operation, in the chuck or fixture 43 which is mounted on the shaft 44 and is adapted to revolve with the shaft 44, the chuck 43 being driven by the keys 45 which suitably engage a keyway in the hub 41 of the chuck 43, the chuck 43 being secured on the shaft 44 by the nut 45, the shaft 44 being operatively mounted as hereinafter disclosed. The chuck 43 is provided with the recess 48 which is formed to engage and fit with the outside surfaces of the skillet 35. The chuck 43 is also provided with the cut away portion or notch 49 to clear the handle 33 of the skillet 35.

The chuck 43 is further provided with the holes 53 through which extend the bolts 5I which are suitably secured to the clamp members 52, the clamp members 52 being resiliently urged toward the outer surface 53 of the chuck 43 by the springs 54 which are retained on the bolts 5I by the washers 55 andthe pins 55the springs 54 being contained within the recesses 51 of the chuck 43. The clamp members 52 areeach provided with the notch or recess 58 which permit the

flared portions

33 and 31 of the skillet 35 to be inserted therethrough when the skillet 35 is being secured in the chuck 43, the handle 39 of the skillet 35 occupying a position, as indicated by dotted lines at 53, in Fig. l0, and the skillet 35 can now be rotated labout the axis of the chuck 43 and the shaft 44 until the

flared portions

35 and 31 have been moved to positions under the clamp members 52 or to a position in which the handle 38 will occupy the position indicated by the full lines of the handle 33 in Fig. l0, and in which position the flared

portions

33 and 31 will be resiliently clamped by the clamp members 52 and the skillet 35 will be secured in the chuck 43 preparatory to the grinding operation.

It is to be noted that the skillet 35 can thus be easily and quickly inserted to or removed from its clamped position in the chuck 43 thus facilitating at its upper side, with the column, pedestal or boss 64 and on its lower side with the arm, extension, pr bracket portion 85 Vwhich extends within'the chamber 68 of the column 4.

The arm 65 of the carriage 83 may be constructed with a triangular shape having oppositely disposed walls 288 with a connecting web 285, all terminatingin or connecting at their lower ends, with the boss 68 provided with the slot 58 and the clamp bolt 18 vfor clamping the boss 58 and securing the stud 1| therein, the stud 1| being provided with the extension end 12 on which is suitably secured lthe bushing 13 which acts as a cam follower for engaging the groove 14 of the cam member 15. l

The cam member 15 is provided with the walll 16 which closes one side of the groove 14 and sup- V ports the side walls of the groove 14, the inner surfaces of said side wall .being engaged by the bushing 13 which together with the extension end 12 extends into the groove 14 of the cam member 15.. The cam member 151s also provided with the hub 11 which is secured in a driven position on the shaft 18 by the keys 18, the outer end of the bushing 13 and the extension end 12 `contacting with the bottom surface of the groove 14 and the outer surface 88 of the cam member '15 contacting with the surface 8| of the arm 85.

The column 4 is provided with the opening 82 in one of its walls atta point opposite or in alignment with the arm 55 and the cam member 15 and is also further provided with the opening 83 in one of its wallsat a point approximately opposite the opening 82 and in alignment with the arm 85 and the cam member 15. The opening 82 is closed by the cover 84 secured to the column 4 by the screws 85 which engage the threaded holes /88 in the walls of the column 4. The opening 83 is closed by the housing 81 which is provided with the flange 88 through which extend the screws 88 for securing the housing 81 to the walls of the column 4. The housing 81 is further provided with the wall 88 which is provided with .the boss 8| in which is supported the bearing assembly 82 for suppOrtng the shaft 18. The housing 81 is further provided with the recess 83 which is closed at its outer side by the housing 84 which has a pilot portion 85 for extending within the recess 83, said housing 84 being provided with the extension boss 88 for supporting the bearing assembly 8i in which is supported the outer end of the shaft 18. The shaft 18 is provided with the Washer cr ange 88 and vthe nut |88 for securing the bearnig assembly 81 on the shaft 18, the washer 88 tting within and closing the outer end of the recess |8| which contains the bearing assembly 81, suitable operating'clearance being provided between the washer 88 andthe inside surface of the recess |8| to permit the washer 88 to revolve with `the shaft 18 which extends through the hole iM of the housing 84. The housing 84 is provided with the iiange |83 which may be suitably secured'as by screws extending through the flange |83 into the walls of the housing 81.

The housing 84 may be further provided with the bracket |83A which may be suitably secured thereto by screws or by constructing it integrally with the housing 84. The electric motor assembly B is secured to the bracket |83A by the screws |84 and is provided with the shaft |85 which extends into the chamber |88 of the housing |81 which may be suitably supported'onv the shaft |85 and on the housing |88 which-is provided with an extension portion |88 which extends within and is supported by the housing 84. 1

The driver sprocket ||8 s suitably mounted on the shaft I 85 and is adapted to be driven thereby,

the end of the shaft |85 and the sprocket ||8 revolving in the chamber |88. The housing |81 may be provided with the cover ||4 which is secured by the wing nut ||2 and stud H3, the stud ||3 being suitably anchored in the housing |81, the cover H4 being thus readily removable to permit access to thechamber |88 to inspect and service the chain ||5 which engages the driver sprocket ||8 and the driven sprocket H6, the driven sprocket H6 being suitably mounted on the shaft |1 which is suitably supported and operatively mounted in the boss portion ||8 of the housing |88 which is further provided with the gear case ||8 in which operate the gears |28 and |2|, the gear |28 being suitably, mounted on the end of the shaft ||1, the gear |2| being suitably mounted onthe end of the shaft |22 which is suitably mounted in the boss portion |23 of the housing |88,'the shaft |22 extending into the upper portion of the gear chamber |24 in which are suitably mounted the worm 25 and the worm ear |26, the worm |25 being suitably mounted on the shafe |22 and the worm gear |25 being suitably mounted on the shaft |21 which is rotatably` mounted-in the bearing assemblies |28and |28 which are suitably mounted in the extension portion |88 lof the housing |88. y

'Ihe stud |5| is secured in the flange' |44 by the nut |52 and is provided with the endv or cam follower |53 which is adapted to extend within the cam grooves formed between the above mentioned cam members |48, |41, |48, |48 and |58 as hereinafter more fully disclosed.

assembly

The gear 200 is suitably secured and supported on the shaft |94 and operatively engages the gear 20| which also operates in the gear chamber 295, the gear 20| being suitably secured and supported on the shaft 44 by the keys 202 and the nut 203 said shaft 44 extending into the gear chamber 295.

Fig. 12 discloses a true side view of the electric motor assembly C and the gear case v|96 together with the chain case 204 for enclosing the chain |92 and theA sprockets |9| and |93, the chain case 204 being suitably supported on the armature shaft |90 of the electric motor assembly C and on the extension portion 205 of the shaft |94, the chain case 204 being provided with the cover 206 which is secured by the wing nut 201 which engages the stud 208 which is suitably secured to portions of the chain case 204 thus \the grinding wheel 3|.

permitting access to theA inside of the chain case 204 for inspection and service operations.

The shaft |94 is provided with the extension portion 209 on which is mounted the brake drum 2 0 which is engaged by the brake band 2| which is operated by the lever 2|2 to engage the brake drum 2|0 to provide means for decelerating, braking, and stopping the movement of the chuck 43 and the skillet 35 when secured therein, the lever 2|2 being suitably mounted on the stud 2|3.

It is to be noted that the housing head |62 is further provided with the arm 2|4 to which are suitably secured the members 2 l5 and 2|6 which are each provided with suitable neck or undercut portions 222 to engage the eye portions 305 to provide a swivel or pivotal engagement for the eye portions 305 of the rods or shafts 2|1 which extend through and are supported in the plate or bracket members 2|8 and 224 which are secured to the guiding arm |31 by the screws 2| 9.

The rods 2|1 are provided with the springs 220 which tend to always pull the arm 2|4 towards the bracket members 2|8 and 224, thus tending to always oscillate the housing head |62 about the shaft |55 and force the skillet 35 against The reaction thrust of the springs 220 is taken against the thumb nuts 225 which threadably and adjustably engage the rods 2|1. The set screw 30| is threadably and adjustably mounted in the plate member 2|8 to provide a stop member for engaging the arm 2|4 to limit its oscillating or pivotal movement in one direction, the set screw 220 being locked in its adjusted position by the lock nut 22|.

Figs. 3 and 4 disclose the cam members |46, |41, |48, |49 and |50 which are so supported on the column 5 as to provide the proper cam grooves to'engage the end or cam follower |53 of the stud |5| in the guiding arm |31 so as to provide the proper pivotal or oscillating movement of the housing head |62, when the carriage 84 is reciprocated by the cam member 15, to move the skillet or similar obj ect to be ground in the proper path to enable the grinding wheel 3| to perform the required grinding operation.

The column 5 is provided with the upper surface 226 together with the bosses 221 and the support member 228 is suitably secured to the upper surface 226 by the screws 298 extending through the support member 228 and linto suitable holes in the bosses 221. The support member 228 is provided with the boss portion 229 in which is suitably secured the stud member 230 which extends above the surface 23| of the boss portion 229 of the support'l member 228 and engages the bushing 232 which is suitably secured in the boss portion 233 of the member'293 to -which is secured the cam block 234 by means of the screws 294, the boss portion 233 having its surface 235 engaging the surface 23| of the support member 228, the cam block 234 being further supported by the surfaces of the boss portions 236 and 231 of themember 293 contacting similar surfaces on the

boss portions

238 and 239 of the support member 228.

The support member 228 may be provided with the rib 240 and the l/member 293 may be provided with the rib 24| for reinforcing purposes.4

The support member' 228 is provided with the notch 242 which is adapted to be engaged by the lug 243 of the lever 244 which is pivotally mounted on the pin 245 which is suitably mounted in the bosses or ears 246 between which the lever 244 is thus operatively mounted, the bosses or ears block 234 with the screws 241 and is provided with the convex cam surface 248 together with the extension portion 24.9 in which is threadedly mounted the set screw 250 which engages and constitutes-a reaction, backing or support member for the :am member |41 which is secured to the cam block 234 by the screw 25|, the screw 25| extending through the radially disposed slot 252 thus providing radial adjustment of the cam member |41 about the approximate center or point designated at 253. The cam member |41 is provided with the concave cam surface 254 which extends approximately to a point adjacent the inner end of the convex cam surface 248 of the cam member |46. The cam member |50 is secured to the cam block 234 by the screws 255 and is provided with the concave cam surface 256. The cam member |49 is located adjacent theend of the cam member |50, is secured tothe cam block 234 by the screw 251, and is provided with the concave cam surface 258 which forms an extension of the concave cam surface 256 of the cam member |59, said cammember |49 being further provided with the extension portion 259 in which is threadably mounted the set screw 260 which engages and constitutes a reaction, backing or support member for the cam member |48 which is secured to the cam block 234 by the screw 26| which extends through the radial slot 262, thus providing radial adjustment about the approximate center point designated at 263.

'Ihe cam member |48 is provided with the convex cam surface 264 which forms an extension of the concave cam surface 258 of the cam `mem 4 ber |49.

It is to be noted that the cam surfaces 248, 256, 258, 254 and 264.will form the

cam grooves

265 and 266 in which moves the end or cam followerA |53 of the stud |5|, the shape of the

grooves

265 and 266 determining, in conjunction with the reciprocating movement the carriage 63, the movement of the skillet 35 relative to the grinding wheel 3|, enabling the grinding wheel 3| to properly grind the

surfaces

33 and 34 and to form the radius 39 of the skillet 35.

The cam grooves 265 land 266 are so laid out and constructed that the grinding wheel 3| will grind the surface 33 along a slightly angular path or surface, relative to the outside bottom surface of the skillet 35, so that the surface 33 will be slightly higher at its center point, designated at 261, in Fig. 8 than at the radius 39, the grinding wheel 3| thus running out at the point 261 at the center of the skillet` the thickness of the bottom wall of the skillet 35 thus being greater at the point 261 than at the junction of the surface 33 and the radius 39.

It is to be noted that as the cam follower |53 moves in the

grooves

265 and 266, the housing head |62 and the skillet 35 will oscillate about the shaft |36 thus causing the pull of the springs 220 to vary and to exert varying loads on the arm 2| 4 and the housing head 62 with a consequent varying thrust of the skillet 35 against the grinding Wheel 3| It is to be noted that the shape of the

cam grooves

265 and 266 will thus cause the cam follower |53 and its operatively connected mechanism to so move in cooperation relative the grind' ing wheel 3| and the springs 228 that the springs 220 will exert their minimum pull and a consequent minimum thrust of the skillet '35 against the grinding wheel 3| when the grinding wheel 3| is running out or ceasing grinding contact at the point 261 and at the point 268, in Fig. 8,Y

which is the edge of the

surface

3,4.

It is also to be noted that the cam groove 14 of the cam member 15 is so laid out and constructed that the cam follower 13 will occupy varying positions relative to theaxis of the shaft 18, the axis of the cam member and the shaft 18 being approximately located and designated at the point 269, Fig. 6.

It is thus to be noted that the cam follower 13 and the carriage 63 and the mechanism operatively connected therebetween together with the housing head |62 and the skillet 35 will be moved by the reciprocating movement of the carriage 63 with varying rates of speed to provide the minimum rate of travel of the skillet 35 relative to the grinding wheel 3| at the point where the radius 39 is being ground, the contact of the cam follower 13 and the cam groove 14 extending approximately between the angular lines 210 and 21|, extending through the point 269, when the grinding wheel 3| is thus grinding the radius 39.

It is thus to be noted that the movement of the carriage 63 will decrease from the point of intersection of the line 21| with the groove 14 to the point 269 where the groove 14 approximately terminates, this portion of the movement of the carriage 63 corresponding to the normal maximum peripheral surface speed of the skillet 35 and of the surface 34.

Also the movement of the carriage 63 will increase from the point of intersection of the line 210 with the groove 14 to the approximate position determined by the intersection of the line designated by the numeral 212, with the groove 14, which corresponds approximately to the normal minimum surface speed of the skillet 35,

.which occurs when the grinding wheel is running out at the point 261 at the center of the skillet 35.

In order to facilitate the insertion and removal of the skillet 35 from the chuck 43, the lever 244 is pivotally moved upward `to release the lug 243 from engagement with the notch 242 thus permittingthe member 293 and its supported parts to be pivotally moved about the stud 23|) until the handle 244 occupies the position indicated by the `dotted lines 213, and the check 43 occupies the portion 215`of the support member 228 may ber` provided with the series of holes 216 for receiving the screw 216A for securing the stop member 218 which is provided, as disclosed in Fig. 5, with the extension 219 for engaging the lower side of the portion 215, the' stop member 218 being adapted to engage and limit the movement of the lug 243 which' in turn .limits the movement of the cam block 234 and the member 29,3and their connected mechanism.

It is also to be noted that when the handle 244 is in thelposition indicated by the dotted lines 213, Fig. 1, and is manually released, the pull yof the springs 220 will automatically cause the housing head |62\and its connected parts to pivotally move back to the'position in which the skillet 35 will be in grinding position adjacent the grinding wheel 3| and in which position the lug 243 will automatically become engaged again with the notch 242.

The cross slide 82 is constructed with the opening 298, through which extends the arm 85 of the carriage 63, and may be constructed with an additional opening 29|, for inspection or manufacturing purposes, the additional opening 29| being closed by the cover 292 secured by the screws 388, as disclosed in Fig..1.

The push switch 288 is suitably mounted on the electric motor assembly A, the switch box 28| is suitably mounted on the column 5, and the switch box 282 is suitably mounted on the column 4. The switch 288, the switch box 28| and the switch box 282 are also indicated by the same numerals in the wiring diagram, as disclosed in Fig. 18, said wiring diagram disclosing in a conventional way the electrical circuit for controlling the mechanism of the grinding machine, the electric cables and wires being omitted from Figs. 1 and 2 to clarify .the disclosure of the mechanism of the grinding machine.

The reversing switch 283 and the stop switch 284 are suitably mounted adjacent the reciprocating cross slide 82 and the carriage 83 so as to be engaged by suitable portions or parts attached to the cross slide 62 or carriage 83, the reversing' switch 283 and the stop switch 284 thereby being actuated at the ends of the movement of the cross slide 82 and the carriage 83 to electrically control the operation of the various electric power units of the grinding machine. The

switches

283 and 284 are of the double throw, single pole limit switch design and are always normally closed on one side. Said switches 283 and 284 are of the quick make and quick break acting type and will easily return to their normally closed position when said switches are not operatively connected with the portions of the cross slides 62 or 63 by which they are operated. Said switches 283 and' 284 incorporate a spring or similar mechanism which maintains the switches in their closed position when not contacted by said portions of the cross slides 62 or 63 and are thus of conventional typeand design as used commercially in such units.

The knife switch 285, as disclosed in Fig. 18, is suitably mounted and is electrically connected to the supply wires 288, 281, and 288.

It will be noted that when the knife switch 285 is closed the electric current will ow to and immediately operate the electric motor assembly A and the grinding wheel 3| and also the electric current will iiow to the push button switch 288 as well as the switch boxes 28| and 282, the operation of the

push buttons

289 and 291 of the push button switch 288 controlling the starting or the electric motors B and C for operating the cross slide 82 andthe carriage 83 and their supported mechanism and also for revolvably operating the chuck 43, the relay switches in the switch boxes 28| and 282 being thus controlled by the 'operation of said push'buttons 289 and 291. The reversing switch 283, when actuated by the reciprocation of the cross slide 62 and carriages 83, at the end of their -inward movement will cause the electric motor B to reverse its direction of rotation and thus cause the cross slide 82 and the carriage 63 to reciprocatingly move in the opposite or outward direction until the cross slide 82 or carriage actuates the stop switch 284 and stops the rotative operation ot the electric motor B, thus stopping the cross slide 82 and the carriage at the outward end of their stroke, the operation being repeated when the operator again actuates the starting push button of the starter switch 288.

It is to be noted that when the electric motor assembly C is electrically controlled to rotatively operate, the rotative operation of the electric motor assembly B with its armature shaft |85 will operate the drive sprocket ||0 which will cause the chain I I5 to drive the driven gear |18 which op ates the shaft ||1 and the drive gear |28 wh ch drives the driven gear |2| which operates the shaft |22 and the work |25 which in turn drives the worm gear |28 operatively connected with the shaft |21 and the drive gear |38 which drives the driven gear |3| which operates the shaft 18 upon which is mounted the cam member 15,which engages the cam follower 13, thus providing a drive mechanism for the cross slide .62 and the carriage 63 and their supported mechanism which is greatly reduced in speed relative tothe rotative speed of the grinding wheel 3| or the chuck 43, this being necessary to provide the proper cutting or grinding speed in the operation of grinding the skillet 35. l

The cam block 234 is provided with the radial slots 381 and the screws 308 suitably mounted and rextending to permit adjustment of the cam block I claim:

1. In a grinding machine, the combination of a base provided with a plurality of columns, an electric motor assembly, means for adjusting said electric motor assembly in a plurality of positions in horizontal planes, said means being supported on one of said columns, a grinding member mounted on and operatively driven by said electric motor assembly, a carriage slidably mounted on one of said columns, said carriage being provided with an arm extending below said carriage, a cam follower suitably mounted on said arm of said carriage,a cam member provided with an irregular shaped groove to cause said carriage to travel with varying rates of speed, the groove of said cam member engaging the cam follower of the arm of said carriage, means for revolving said cam member, a second electric motor assembly for driving said means for revolving said cam member, a guiding arm pivotally mounted on said carriage, said arm being provided with a cam follower, cam mechanism suitably supported on one of the columns of said base, said cam mechanism being engaged by the cam follower of said guiding arm, a housing head pivotally mounted on said guiding arm, a chuck rotatably mounted on said housing head, said chuck being adapted to support the object to be ground, a third electric motor assembly suitably mounted on said housadapted to drive said chuck, manually operated means for pivotally moving said chuck together with its supported object away from said grinding member, means for resiliently moving said chuck and its supported object toward said grinding member, and control means for controlling the operation of said electric motor assemblies, said control means reversing the rotative operation of said second electric motor assembly at one end of the movement of said carriage, said control means stopping the rotative operation of said second electric motor at thel other end of the movement of said carriage.

2. In a grinding machine, the combination of means for grinding, a chuck mechanism for holding the object to be ground, driving mechanism y for said chuck mechanism, arm pivotally mounted 'and supporting said chuck and said driving mechanism to enable said chuck mechanism and said object to be pivotally moved in a horizontal plane away from said meansfor grinding, reciprocating means supporting said arm and adapted to move said chuck mechanism and said object to and from said means for grinding, cam means engaging said arm to move said arm and its supported mechanism in a horizontal plane and in a transverse direction to the movement of said reciprocating means, electrically operated means for reversing the movement of said reciprocating means at one end of its movement, and a second electrically operated means for stopping said reciprocating means at the en d of its movement.

3. In a grinding machine, the combination of a grinding member, chuck means for holding the object to be ground, pivotally mounted means supporting said chuck means, a second pivotally mounted means supporting said iirst mentioned pivotally mounted means, means for reciprocating said rst mentioned and said second pivotally,

mounted means together with said chuck means, and means for oscillating said ilrst mentioned and said second mentioned pivotally mounted means together with said chuck means, said reciprocating and said oscillating movements combining to provide a resultant movement enabling said grinding member to grind irregular surfaces on said object.

4. In a grinding machine, the combination of a carriage movably mounted, means for reciprocating said carriage, a guide arm pivotally supported on said carriage, means for supporting and guiding said guide arm at ,one of its ends, a housing head pivotally supported on said guide arm, a chuck rotatively supported on said housing head, said/chuck supporting the object to be ground, means for driving said chuck, said means for guiding said chuck being supported on said housing head, a member for grinding the object supported in said chuck, and means 4for driving said grinding member. ,A

5. In a machine for grinding an object, the combination of a carriage movably mounted, means for reciprocating said carriage, a grinding arm pivotally mounted at one of its ends only on said carriage, cam mechanism mounted to engage said guiding arm, said cam mechanism supporting the other end of said guiding arm, a housing head pivotally mounted on said guiding arm, a chuck pivotally mounted on said housing head and adapted to support said object, said chuck'. being actuated by the associated movements oi said carriage and said guiding arm to move said chuck together with said object in an irregular path, and a grinding member engagingV said object.

6. In a grinding machine, the combination oi!-y a chuck rotatively mounted, said chuck being adapted to receive the object to be ground, clamping members on said chuck, said clamping members being provided with notches to permit extension portions ofv said object therethr ugh, said clamping members securing said objec when the extension portions of said object have been moved between said clamping members and said chuck, and resilient members for urging said clamping members toward said chuck.

7. In a grinding machine, the combination of a carriage mounted to reciprocate and provided with an arm member, a cam follower mounted in said arm member, 'a cam member mounted to engage saidcam follower and provided with cam surfaces shaped to cause, when engaged by said cam follower, a reciprocating movement of said carriage with varying rates of speed, means for rotating said cam follower, and means mounted on said carriage for supporting the object to be ground.

8. In agrinding machine, the combination of a base provided with a column, a carriage movably mounted on the column of said base, a cam member operatively connected with and adapted to reciprocate said carriage at varying rates of speed throughout the movement of said carriage, a power unit suitably mounted on said column, Vand gear reduction mechanism operatively connecting said cam member and said power unit.

9. In a grinding machine for grinding an object having a pair of surfaces extending at an angle with one another and joined by a radius, the combination oi a grinding member rotatably mounted .and ilxed against axial movement, means for holding the object to be ground, said means beingA y pivotally mounted to move in a plane substantially parallel with the axis of said grinding member, and means for actuating said rst mentioned means to cause said object to move past said grinding member, said second mentioned means moving said object at a dierent rate of speed when the radius of said object is engaged by said grinding member than the rate of speed at which said object is moved when said grinding member is engaging either of the other of the pair of surfaces of said object.

10. In a grinding machine, the combination of a carriage mounted to move in a. horizontal plane, a guiding army mounted on said carriage and adapted'to pivotally move in a horizontal plane,

a cam mechanism suitably mounted and adapted to control the pivotal movement of said guiding arm, said cam mechanism being independently supported relative to said carriage, said cam mechanism supporting one end oi' said guiding arm, a housing head mounted on said guiding ann and adapted to pivotally move in a horizontal plane, a chuck rotatively mounted on said housing head, means for driving said chuck, and means for moving said carriage.

11. In a grinding machine, the combination of a cam mechanism provided with a groove in its uppermost surface, a carriage, a, guiding arm pivotally mounted on said carriage and provided with a cam follower, engaging the groove of said cam mechanism, means for reciprocating said carriage and said guiding arm, said guiding arm being pivotally moved on said carriage by the cam follower moving in the groove of said vcam mechanism, a chuck rotatively mounted and adapted to hold the object to be ground, means said cam mechanism, a stop member limiting the pivotal movement of said cam4 mechanism, resiliently operated means opposing theV pivotal movement of said cam mechanism, a chuck rotatively mounted on said carriage, and means for driving said chuck.

13. In a grinding machine, the combination of a carriage movably mounted and provided with a cam follower, and means for reciprocating said carriage, said means comprising a cam member having an irregular shaped cam surface for engaging a portion of said carriage, said cam member being suitably :mounted to rotate about an axis extended substantially at right angles to the line of movement of said carriage, said irregular shaped cam surface" being located in the end of said cammember and engaged by the cam follower of said carriage, said cam surface being adapted to cause said carriage to move at a relatively slow rate of speed when one end of said irregular cam surface is engaging said portion of said carriage, said cam surface being adapted to cause said carriage to move at a relatively fast rate of speed when the other end of said cam surface is engaging said portion of said carriage.

14. In a grinding machine, the combination of a pair of columns supported on a base, a carriage movably mounted on one of said columns, a m mechanism movably mounted on the other of said columns. a guiding arm pivotally mounted on said carriage and 0118581118 said cam mechanism, a chuck rotatively mounted on said guiding ann, means for revolvingsaid chuck, and means for reciprocating said carriage and said guiding arm. 15. In a grinding machine, the combination of la work supporting member, electrically operated power means for reciprocating said work supporting member. and switch units suitably located adjacent said work supporting member so as to be engaged and operated by said work supporting member at the ends of its reciprocating movement, said switch units being electrically connected with and adapted to control said electrically operated power means to respectively reverse and to stop the ,reciprocating movement of said work supporting means at the ends of its reciprocating movement.

16. In a grinding machine,

'a-base provided with three columns, a power unit suitablymounted on one of said columns and provided with a grinding member, a carriage suitably mounted to reciprocate on one/ of said columns, a guiding arm pivotally mounted on said carriage and provided with a cam engaging member, cam means suitably mounted on one of said columns and engaging the cam engaging member oi said guiding arm, a housing) head pivotally mounted on said guiding arm, work-holding means suitably mounted on said housing head, means for actuating said carriage, said means further actuating said guiding arm to movably engage said cam means, and means for rotatably driving said work holding means.

17. In a grinding machine. the combination of a reciprocating mechanism provided with a guiding arm pivotaily mounted thereon and extending therefrom at an angle with the direction of the reciprocating movement, a coluinn partially supporting said reciprocating mechanism, cam means engaged by and partially ysupporting said guiding arm of said reciprocating mechanism to vary the direction of movement of said. reciprocating mechanism, a second column supporting said cam means, means for driving said reciprocating mechanism, work holding means suitably mounted on said reciprocating mechanism, and means for driving said work holding means, said last mentioned means being supported by said guiding arm.

is.' rn s grinding mechanism, the combination' of a hollow column, a carriage slidably mounted on said column and provided with a cam follower extending within said hollow column, acam the combination of member revolvably mounted and extending through one of the sides of said hollow column lower, a power unit suitably supported on the outside wall of said hollow column, said power unit being operatively connected with said cam member, and work .holding means suitably mounted on said carriage.

19. In a grinding machine, a carriage suitably mounted to reciprocate, said carriage being provided with a depending bracket. a cam follower suitably mounted in the bracket of said carriage and having its axis extending at right angles to the direction of the reciprocating movement of said carriage, a cam member revlvably mounted and provided with an open sided groove engaging said cam follower, the open side of said groove extending parallel with the direction of the reciprocating movement of said carriage, powermea'ns for revolving said cam member to reciprocate said carriage member, and work holding means suitably mounted on said carriage.

20. In a grinding machine, the combination of a carriage provided with a bracket, a cam iollower suitably mounted in said bracket, a cam member revolvably mounted and provided with a groove for receiving said cam follower therein, the axis of said cam member extending substantially at right angles with the longitudinal center the combination of of said carriage, said groove extending in a. single plane, means for revolving said cam member, and work holding means suitably mounted on said carriage.

21. In a grinding machine, the combination of a chuck rotatably mounted and provided with a recess conforming to the shape of the object to be ground, said chuck being provided with one or more notches adjacent said recessto permit a portion of the object to be ground to extend through one or more of said notches when said object is entered in said chuck, and clamping means suitably mounted adjacent said notches to retain the object to be ground in the recess of said chuck, said clamping means being limited to move relative to said chuck, in a direction extending parallel with the axis of said chuck. said object being rotated radially to cause said -portonsof the object entering through said one or more of said notches of said chuck to pass under said clamping means.

22. In a grinding machine, the combination of a chuck provided with one or more notches for receiving the work to be ground, clamping members extending across each of the notches of said chuck, each of said clamping members being provided with a notch to receive therethrough a portion of the work to be ground, bolt members connected with said clamping members and extending through portions of said chuck, and'resilient means suitably mounted onl carriage, acam member provided with a shaft extension mounted in said housing, a driven gear member suitably mountedV on the shaft extension of said cam member within said housing, a

second housing suitably mounted in said first 1 mentioned housing, a shaft suitably mounted in said second housing and provided with a gear engaging the driven gear of said cam member, said last mentioned shaft being provided with a worm gear, a worm suitably mounted and engaging said worm gear,an electric motor suitably mounted on said iirst mentioned housing, gear means operatively connecting said electric motor and said worm, and work holding means suitably mounted on said carriage.

24. In a grinding machine, the-combination of a carriage suitably mounted to have a reciprocating movement, said carriage being provided with a pedestal, a shaft suitably mounted in the pedestal of said carriage, a guiding arm pivotally mounted on said shaft, a cam follower suitably mounted in'said guiding arm, a second shaft suitably mounted on said guiding arm, a housing head pivotally mounted on said second shaft, said housing head being provided with an arm, resiliently actuated. means suitably mounted on said guiding arm and adapted to move the arm of said housing head toward a stop, a stop member suitably mounted to limit thepivotal movement of the arm ofsaid housing head,`work` holdingmeans suitably mounted onsaid housing head, cam means suitably mounted and engaging the cam follower of said guiding arm, and means foractuating said carriage.

2,5. In a grinding machine, the combination of a carriage, a pair of `pivotally mounted members,

resiliently actuated means adapted to pivotally move one of said pivotally mounted members relatively to the other, a. stop member suitably mounted to limit the pivotal movement of said one of said pivotally mounted members, work holdingY means suitably mounted on one of said pair of pivotally mounted members, means for reciprocating said carriage, and means for varying the direction of movement of one of said plvotally mounted members when said carriage is reciprocated.

26. In a grinding machine, the combination of Ia carriage reciprocatingly mounted, a guiding arm pivotally mounted on said carriage, fixed cam means engaging said guiding arm, a hous- 'means for actuating said carriage in its reciprocating movement.`

27. In a grinding machine, the combination of a column, a member suitably supported on said column and provided with a pivot portion together with a notch portion, a second member supported on said rst mentioned member and adapted to. be pivotally moved about the pivot portion of said iirst mentioned member, a lever pivotally mounted on said second member and adapted to engage the notch portion of said first mentioned member, a cani block suitably mounted on said second member, a plurality of cam blocks suitably mounted on said cam block to form a cam groove therebetween, a carriage reciprocatingly mounted, a guiding arm pivotally mounted on said carriage and adapted to engage the cam groove between said cam blocks, work holding means pivotally mounted on said guiding arm, and resilient means suitably mounted to oppose the pivotal movement of said second member.

28. In a grinding machine, the combination of a member suitably mounted, a second member supported on and pivotally connected with said iirst mentioned member, means for locking said groove of said cam means, resilient means suit.

ably mounted to oppose the pivotal movement of said second member, and work holding means pivotally mounted on said guiding arm.

29. In a grinding machine, the combination of a plurality of cam blocks suitably mounted to provide a cam groove therebetween, a carriage reciprocatingly mounted, a guiding arm pivotally mounted on said carriage and supported at one of its ends on said cam blocks, av cam follower suitably mounted 'on said guiding arm and engaging the groove between said cam blocks, means for adjusting the position of one or more of said cam blocks, work holding means suitably mounted on said guiding'arm, and means for reciprocating said carriage together with said guiding arm an said work holding means. y

30. In a grinding machine, the combination of a plurality of cam blocks. means for pivotally adjusting each of said cam blocks, a plurality of cam blocks suitably mounted and each provided with extension portions, stop members suitably mounted in the extension portions of each of said last mentionedA cam blocks and adapted to contact one of said first mentioned cam blocks to form reaction members therefor, a carriage movably mounted, a guiding arm pivotally mounted on said carriage and engaging said cam blocks to vary its pivotal movement, work holding means suitably mounted on said guiding arm, and means for actuating said carriage.

31. In a grinding machine, the combination of a pivotally mounted membe cam blocks suitably mounted on said member and providing a cam groove, a pivotally mounted handle on said pivotally mounted member, means suitably mounted to engage said pivotally mounted handle to lock said pivotally mounted member against pivotal movement, stop means suitably mounted to limit the pivotal movement of said pivotally mounted member in one direction; a carriage movably mounted, aguiding arm pivotally mounted on said carriage and engaging the cam groove of said cam blocks, a work holding means suitably mounted on said guiding arm, resilient means suitably mounted to oppose the pivotal move- 'I ment oi' said pivotally mounted member, andf -means for actuating said carriage. l

32. In a grinding machine, the combination of apivotally mounted member, a cam block` supporting member suitably mounted on said pivotally mounted member and provided with radial grooves therethrough, a plurality of cam memi, ,s bers suitably mounted on said cam block and providing a cam groove, fastening means extending through the radial grooves of said cam block and engaging said pivotally mounted member, means i for locking said pivotally mounted member against pivotal movement, a carriage movably mounted, a guiding arm pivotally mounted on said carriage and engaging the cam groove provided by said plurality of cam members, a work holding means suitably mounted on saidguiding arm, and means for actuating said carriage.

GUSTAVE A. CARLSON.