US1631188A - Grinding machine - Google Patents

Description

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Patented June 7, 1927. v

UNITED STATES WILLIAM J. BAUIBERGER, OF DAVENIIORT, IOWA, ABSIGNOB, BY ml- 'PATENT'. orrice. f

Assma- MENTS, T0 MICRO MACHINE COMPANY, Ol' BETTENDORI, IOWA, A COBPOTIOI Ol' IOWA.

GBINDING HACHINB.

Application tied June 8, 1992. serial Ho.' 506,141.

This invention relates to improvements in grinding machines, and more particularly a grindin machine of the vertical type Whereinthe grindin wheel operates wit a vertical movement van the table is given an orbital motion in a horizontal lane to thereby e'ect grinding of cylindrica surfaces.

One object of my invention is to provide a grinding machine of the character indicated in which provision is made for a wide lrange of adjustment for grinding the surfaces of c lindrical bodies without the necessityy of cianging the size of the grinding Wheel. y' y A further object of the invention is to provide a grindin'gvmachine of the character indicated wherein the grinding wheel operates linv a vertical direction and is so mounted as to accommodate any desired range in the depth of the surface to be ground.

Other and furtherobjects of my invention are: to provide a grinding machine wherein the table and the grinding wheel are given movements independently of each other to thereby. obtain independent adjustment and variations in the speed of movement of the table; to provide a machine wherein the number of parts is reduced to a minimum to thereby eliminate lost motion and reduce cost of manufacture; to provide a grinding machine wherein the feed mechanism for the table is susceptible of micrometer adjustment; to provide a machine in which the object to be ground maybe readily and conveniently mounted and accurately centered with respect to thegrinding wheel without Vthrowing' o' the power; and to provide a machine in which a continuous supplyl of water may be delivered to the surface being ground to thereby maintain the 'surface at a proper temperature.

With the foregoing objects in view, as well as others which will be apparent as the description proceeds, the invention consists in the parts and combinations thereof hereinafter set forth and claimed, with the understanding that the size, proportion and arrangement may be varied without departing from the spirit and scope of the invention.

In the drawings forming a part of this specification, Fi ure 1 is a side elevation of a' grinding mac ine showing `my improvements embodied therein and illustrating the construction which I now prefer. Figure 2 is a front elevation of the machine illustrated in Figure 1. Figure 3 is a topplan view of the entire machine. Figures 4 and ,5: are enlarged vertical sectional views, Figure 4 lcorrespondin to the section line 4-'4 of Figure 5 and igure 5 corresponding to the section line 5--5 ofFigure 3. Figure 6 is an enlargedv horizontal sectional view corresponding to the line 6--6 of Figure 5. Figure 7 is a detail, vertical, sectional view correspondin to the line 7--7 of Figure 8. Figure 8 isa view in elevation of certain portions of the adjusting feed and drive mechanism. Fig. 9 1s a horizontal section on line 9-9 of Fig. 7. I

In said drawin 1 indicates the main base or bed of the mac ine'and 2 a column extending upwardly. The base is ri 'dl secured Y to thecolumn as by means o bo ts 5 ((lsee Figure 1), the vbase and'column being hel )in proper alinement as by rib 3 and groove '4 (see Figures 4 and 6) Thecolumn is provided at the top thereof with an .overhang-l ing arm or lcap 6, the same preferabl being secured to the column 2 by. bolts 7. ured at its top to the extending arm or cap 6, as

by bolts 9, is a head stock column 8, the j lower end of said headstock column beingv secured to the lower portion of the column 2, as best shown in Figure 1. An auxiliary column or guide post 11 is also secured at its top, as by a' nut 15, tothe extended arm.

for vertical ysliding movement on thel ead head is' indlcated at 10 (see Figure 1) and Ais ada ted stock column 8 and auxiliary column 11.

At its outer end, saidhead stock is :formed with a spindle clamp housing 10 suitablyA bored to receive the upper s indle housing 16 which is removably secur therein as` by means ofthe clamp screws 10". Said housing l i 10 is verticall slotted as indicated at 10 to thereby rovi e forthe necessary clampin action w en the clamp screws are tightene A lower spindle housin 17 is removably secured within the housing 16 as by a tapered shank' or other suitable means. The

naled within said housings 16 and 17 and is provided at its lower end with a 'nding wheel 19, the latter being made detac able b any suitable means and interchangeable wit 105 grinding wheel spindle 18 is rotatably jourother grinding wheels of any desired size. Said spindle 18 is directly driven by a spline shaft 20 to which it is connected by a coupling 21. Said lower spindle housing 17 `is provided at its top with a funnel-shaped receptacle 52 adapted to receive water supplied from a h'ose 53 adapted to move up and down in unison with the head stock, said receptacle 52 having a suitable opening therein to allow the water to flow continuously to the grinding wheel. By employing the auxiliary column 11,v it will be noted that I insure a true and erfect vertical motion to the head stock 10,

. with its attached grinding wheel and maintain its alinement with the base of the machine.

An electric driving motor for the spindle is preferably' supported upon an offset 2a formed as an integral part of the column 2 and in which offset is formed a cylindrical recess 24 in which is mounted for vertical reciprocation, a plunger 23attached to the bottom of the motor. A coil spring 25 is mounted within the column 2 and is so associated with the plunger 23 as to provide for an automatic adjustment of the tension on the belt operated by said motor. Said motor 22 is provided on its armature shaft with a driving pulley 27 that transmits power to the grlnding wheel through belt 26 which passes over idlers 28 to variable speed pulleys 31 and 31a mounted upon the upper end of said spline shaft- 20.

To obtain'the vertical reciprocation of the head stock 10, I preferably provide the following arrangement. Mounted within the column 2 is a pump 32 arranged to supply hydraulic pressure through a pipe 33 to a control valve 34 also secured to the column 2 (see Figures 1, 2 andl 3). By means of said control valve, the hydraulic pressure,

lthus obtained may be distributed toeither the top or bottom portion of a cylinder 37 mounted in said column 2 and within which is disposed a piston 37a. The hydraulic pressure is communicated to the upper portion of said cylinder on top of the piston 37a `through a' pipe 35 to thereby cause a downward movement of said piston. When it is desired to move the piston upwardly, the pressure is directed through a pipe 36 to the -lower end of the cylinder 37 beneath Asaid piston 37a. The valve 34 is operated by means of a valve lever 48 attached thereto, said lever 48 projecting toward the front side of the machine, as shown best in Figures 1 and 2.

Rigidly connected to the piston 37a and extending downwardly therefrom, is a piston rod 38 which is rigidly connected atits lower end to a head stock rod 39 as by means of the connector 40, shown in Figure 1. The rod 3 9, adjacent its upper end, is bolted or otherwise rigidly secured to the head stock 10, as indicated at 42. At its extreme upper end, said rod 39 is formed with a hook 39a to which is attached one end of a cable 41 that passes over a( pulley 44 rotatably secured in a bracket 45 at the top of the machine. The other end of the cable 41 has a counterbalance weight 43 attached thereto of sutiicient size to properly counterbalance the weight of the head stock 10 and movable parts associated therewith.

To automatically control the up and down movements of the head stock 10, I preferably employ the following arrangement. Se-

cured to the head stock 10 is a stop rod 51 (see Figures 1 and 2). Adjustably mounted on said rod 5l are stops 49 and 50 each having an outwardly projecting arm, as best shown in Figure 2, adapted to engage and trip the valve lever 48 alternately in accordance with the up and down movements of the head stock. Obviously, the stops 49 and 50 can be so adjusted on the rod 51 as to insure reciprocation of the grinding wheel not only the proper amount vertically but between the proper points. Additional safety end fixed stops 46 and 47 are also used to trip the valve lever inthe event the adjustable stops are misadjusted or not properly set.

In order to provide for a circulatory or planetary movement of the article to be ground, as for instance, a'I gas engine cylinder 150 shown in dotted lines in .Figure 1, I preferably employ the following arrangement, it being understood that said circulatory or orbital movement takes place in a horizontal plane or plane perpendicular to the axis of the grinding wheel. Rotatably journaled in the frame of the machine is a horizontally disposed shaft adapted to be rotated by means of the pulley 54 secured at its outer end and driven from any suitable outside source of power. The speed of rotation of the shaft 55 and consequent speed of the orbital movement of the table and work, is preferably regulated by a suitable combination change-speed gearing and clutch indicated conventionally at 57 in Figure 1, said gearing being controlled by a lever 58 working within a quadrant 59 attached to the outer face of the frame. The other end of the shaft 55 (see Figures 1, 7 and .8), is connected by a universal joint or coupling 55a to a` worm jack shaft 55h having a worm 55c formed integrally therewith. Cooperable with the worm 55c is a worm gear GOawhich is mounted within the housing 64, as best shown .in Figure 7. Said housing 64 provides a bearing for the end of said jack shaft 55b and also serves as an oil reservoir to insure proper lubrication for the Worm and worm gear. The worm gear a has integral or rigid therewith, a vertically disposed tubular driving shaft 60 whichis journaled within a bearing 65 in lil() 'turn mounted within a second housing 61.

The latter is rigidly secured, as by bolts 63, to a supporting shelf 62 provided Within the basel 1 (see Figures 1 and 7). The bearing 65 has tapered engagement with the housing 61 to facilita-te assembling and dismantling of the parts and is normallyheld in operative position by means of adjusting nut 66 engaging the lower threaded portions 61la of the housing 61 and attached to the bearing 65 by a vresilient ring or washer 61". The lower end of said driving shaft-60 is formed with gibs or dovetailed projections 67 extending horizontally and with which is adjustably engaged a correspondingly dovetailed portion'of a plate 68. The latter is'provided with an integral or rigid depending stud or gin 69 threaded at its lower end as shown in igures 7 and 8 and which pin or pin, as hereinafter described. In Figures 7 and 8, the parts are shown so adjusted that said stud or wrist pin 69 is axially alined with the drive shaft 60 so that it will be evident, as said drive-shaft. 60 is rotated, said pin or stud 69 will merely rotate about its own axis and wit-hout any eccentric action.

Referring more particularly to Figures 4, 5 and 6, it will be noted that I have provided a motion-transmitting element or yoke 70, the latter being apertured at its center to receive'said stud or wrist pin 69, the latter being held in operative engagement with the yoke 70 as by means of a nut 71 applied to the lower threaded end of said stud. Said yoke 70 is provided with oppositely extending arms. each having an enlargement or bearing suitably transversely bored for the reception of a bushing 91, the latter having sliding engagement with a pair of cross bars 92 which in turn are rigidly connected at their ends by longitudinally extendin bars 93. The rigidly connected bars'92 an 93 form a unitary structure or rectangular frame which is adapted for longitudinal movement or reciproeation within rigidly supported guides 94 (see Figures 4 and 6) and it will also be observed from an'inspection of Figure 4, that said frame may slide vertically with respect to said guides 94. rIhe guides 94 are preferably of angular cross section and rigidly secured to a shelf or support within the basel as by bolts 96. The extreme ends of the motion-transmitting yoke 70 are formed with sockets 70a in which are received the ball ends 70b provided at the lower ends of a pair of motion equalizer levers 72 and 73 (see Figures 4 and 5). In order to impart circulatory or orbital movement to the main table 83, said equalizer levers 72 and 73 are provided intermediate their ends with ball journals 74 and i5 respectively housed within spherical socket bearings 76 and 77 mounted on a supporting shelf 62. The upper ends of said stud partakes of the natureof a wrist equalizer levers 72 and 7 8 are formed with studs or spindles 72 and 73a respectively, which slidably engage'balls 79 and 80, the latter having ball and socket engagement with bearings 81 and 82 rigidly secured to the under side of said main orbital table 83. All of the bearings 81, 82, 70", 76 and 77 are provided with V-shaped apertures (see Figures 4 and 5) to provide the necessary clearance for the oscillating movements of the equalizer levers 72 and 73.

Referring to Figures 4 and 5, it will be noted that the main orbital table 83 is slidably supported on horizontally extending bearing surfaces la-la' provided at the top of the base 1, said bearing surfaces 1 havingsuitable oil Grooves, as shown in Figure 4, andthe tabIe 83 having a depending flange around-its periphery. The table 83 is provided with -a longitudinally extending rib of dovetail cross section as shown in Figure`4 and with which cooperates a correspondingly dovetaled recess 84:t on the under side of a secondary or supertable 84. By this arrangement, the supertable 84 is adjustable lengthwise of the main'orbital table 83 a-s by the adjusting screw 85 to thereby facilitate centering of the work with respect to the grinding wheel. On its upper face,

said supertable 84 is provided with a plurality of transversely extending T slots 86 of well known form and by which are attached longitudinally extending clamping bars 89, the latter-being adjusted relatively toward and from each other by a pair of adjusting screws (see Figures 3 and 4).'

As hereinbefore explained, when the stud or wrist pin 69 is axially alined with the drive shaft 60 and as shown in Figures 7 and 8, said stud or pin 69 will rotate about its own axis and consequently no movement will be imparted to the motion-transmitting 'yoke 70. In order to impart movement to said yoke 70 and consequently to the worksupportin table through the intermedia-ry of the yoe, rectangular frame 92-93 and equalizer levers 72 and 73, it is necessary to move the stud or pin 69 to a position eccentric or out ofA alinement with the axis of the drive shaft 60 and for this purpose, I have provided the following arrangement.

Mountedl at the front of the base 1 is a regulating hand wheel 99 secured to a regulating or adjusting gear shaft 100,said gear shaft being provided with a micrometer reading discl 98, as shown in` Figure 4. The inner end of the adjusting gear shaft 100 (see Figure 8) is provided with a bevel gear 101 meshing with a bevel gear 102 secured to a vertically disposed adjusting screw 103 (see Figure 7). Said screw 103 is supported for rotation in a portion of the housing 6l and is held in vertical position by said gear 102 and a thrust collar 104 attached to the lower end thereof. The upper portion of .collar portion 106' in the adjusting screw 103 is threaded to engage correspondingly threaded sleeve or nut` which said screw 111'is itted, said bearin member 112 being threaded to the upper en of the driven shaft 60 to in turn provide a positive driving connection with said shaft. The screw 111 is formed with a steep itch thread, preferably about 45o, the lthrea s engaging a corresponding internally' threaded upper portion of the vertically disposed n ut or sleeve 114 rotatably mounted within the shaft 60 and held in proper position by suitable means such as the thrust bearings 115-.116'. The lower portion of said nut o-r vsleeve, 114 is machined to provide a depending stud 117 projecting through the bottom end of the drive shaft 60 to thereby provide a rigid connection with a bevel gear 118 (see Figure 7.). As shown in said ligure and also in Figure 8, said gear 118 meshes with a` bevel gear 122 rigid with a horizontally disposed adjusting screw 121. The screw 121 cooperates with .a threaded nut section rigid with the wrist pin plate 68 so that, upon rotation of said screw 121, said plate 68 carrying the stud or wrist pin 69, will obviously be adjusted laterally or radially with -respect to the axis of the drive shaft 60. Attached to the plate 68 is an adjust-` able iiutl120 (see Fi ure 8) and secured to bear against the stationary end of plate 68, is a stop 124, acting as a limiting stop to insure the plate A68 with its stud 69 being brought to rest at its neutral or inoperative position so far as imparting planetary motion to the table is concerned.

j As has heretofore been explained, when the stud or wrist pin 69 is axially alined with the drive shaft 60, transmission of power from the shaft does not induce any movement of the work table and consequently the work on the table may be properly positioned and centered with res ect to the grinding wheel without throwing oil the ower.

.When itis desired to obtainv the orbital or circulator movement of the table and work clamped t ereon, the hand wheel 99v is turned sleeve 105 elevates the intermediate screw 111 whichin turn, due to thesteep pitch of the threads thereon, produces rotation of the nut or sleeve 114. Rotation of the nut or sleeve 114 produces rotation of the bevel gear y118 and the latter in turn produces rotation vvmitted through the drive shaft 60 and derived from the shaft 55, will induce an orbital or circulatory motion of the yoke 70, which in turn induces a movement of the equalizer levers 72 and 73 through a path corresponding to the surfaces of cones and this movement is in turn imparted to the main table, thus producing the desired orbital movement of the table and work mounted thereon.

I claim: ,I ,i 1. Mechanism of thecharacter described, including a work table; and means for imparting 'orlital motion to said table, said means including a driving member, a motion-transmitting member, o rative connection with said driving inem er and motion-v transmitting member arranged to impart circulatory motion to said motion-transmitting member, and equalizer, motion-transmitting elements lbetwelen ,sa'id motion-transmittin member and said table.

2. lechanism of the character set forth, including a work table; and means for imparting orbital movement to said table, comprising equalizer levers pivotally mounted intermediate their ends and operatively conneet-ed with said table at one set of their ends, a yoke operatively connected to the opposite set of ends of said levers, a frame adapted for reciprocation inone direction and upon which said yoke is movable in a direction transverse thereof,a drive shaft, and olperative connections between said drive s aft and/said yoke arranged to impart circulatory motion to said yoke.

3. Mechanism of the character set forth, including a worktable; and means for iinparting orbital movement to said table comprising, equalizer levers'pivotally mounted intermediate ytheir ends and operatively connected with said table at one set of their ends, a yoke operatively connected to the opposite set of ends of said levers, a frame adapted for reciprocation in one direction and upon which said yoke isv movable in a direction transverse thereof, a' drive shaft, and operative connections between said drive shaft and said yoke arranged to impart cirj culatory motion to said yoke, said conneciis tions com rising a wrist pin in operative relation with sald yoke, the wrist pm being adjustable radially with respect to the axis about which it is rotated.

4. Mechanism of the character set forth, including a work table; and means for imparting orbital movement to said table, comprising a drive shaft, a second shaft driven thereby,' the second shaft rotating about an axis perpendicular to the table, a radially adjustable wrist pin carried by said second shaft, a yoke actuated by said wrist pin, a

frame movable in aplane parallel to and lengthwise of said table, said yoke being mounted on said frame and movable transversely thereof, and equalizer levers pivotally mounted intermediate their ends and op erativel connected at one set of ends with said yo e and at the other set of ends with the table.

In witness that I claim the foregoin I have hereunto subscribed my name this 1 th day of May 1922.

WILLIAM J. BAUMBERGER.

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