Grinding machine

May 7, 1935

W. C. OSTERHOLM

2,000,667

GRINDING MACHINE

Filed Dec. 11, 1931 7 Sheets-Sheet 1

<img file="US2000667A_D0001.tif" />

May 7, 1935

2,000,667

W. C. OSTERHOLM

GRINDING MACHINE

Filed Dec. 11, 1931 7 Sheets-Sheet 2

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<img file="US2000667A_D0003.tif" />

May 7, 1935.

2,000,667

<img file="US2000667A_D0004.tif" />

W. C. OSTERHOLM

GRINDING MACHINE

Filed Dec. 11, 1931 7 Sheets-Sheet 3

<img file="US2000667A_D0005.tif" />

<img file="US2000667A_D0006.tif" />

May 7, 1935

2,000,667

Sheets-Sheet 4

W. C. OSTERHOLM

GRINDING MACHINE

Filed Dec. 11, 1931

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βς

May 7, 1935.

2,000,667

Sheets-Sheet 5

W. G. OSTERHOLM

GRINDING MACHINE

Filed Dec. 11, 1931

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JnV&amp;nPp-r: William C O-sterholrn.

<img file="US2000667A_D0011.tif" />

May 7, 1935.

W. C. OSTERHOLM

GRINDING MACHINE

Filed Dec. 11, 1931

2,000,667

Sheets-Sheet 6

<img file="US2000667A_D0012.tif" />

JrijUerbCar·

Ujilliam C Osterholm.

<img file="US2000667A_D0013.tif" />

May 7, 1935. w. c. osterholm 2,000,667

GRINDING MACHINE

Filed Dec. 11, 1931 7 Sheets-Sheet 7

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CUilliam C Osterholm λ

Patented May 7, 1935

2,000,667

UNITED STATES PATENT OFFICE

2,000,667

GRINDING MACHINE William C. Osterholm, Oak Park, Hl. Application December 11,1931, Serial No. 580,269 13 Claims. (Cl. 51—110)

The invention relates to grinding machines.

The embodiment of the invention disclosed contemplates a box-like frame having a horizontal work supporting surface, part of which is ad.5 justable vertically with the remaining work supporting surface being stationary. An annular grinding wheel is suitably mounted within the frame with its axis of rotation substantially vertical, the frame being provided with means 10 whereby the mounting and grinding wheel are vertically adjustable to compensate for the wear of the wheel. For efficient operation of grinders it is necessary to supply sufficient cooling fluid to the grinding wheel to wash away the grit and 15 accordingly the invention incorporates novel means including a plate positioned within the annular grinding wheel for discharging a continuous and adequate supply of cooling fluid radially outwardly toward the wheel and a trough 20 for draining and carrying away the waste fluid.

In view of the above, the primary object of the invention is to provide a grinder for surface grinding work which will be of extreme simplicity in construction, which can be cheaply manufac25 tured, and one that will be efficient in operation, permitting a wide range of adjustability for various work.

A further object is to provide a grinding machine which will be compact and wherein means 30 will be embodied permitting ready and convenient adjustment of the grinding wheel to compensate for wear and adjustment of the work support so that the desired thickness may be ground from the work with the least amount of 35 delay on the part of the operator.

A further object is to provide a horizontal grinder having the face of the grinding wheel disposed horizontally, the grinding wheel having associated therewith a horizontal and stationary 40 table and a vertically adjustable work support.

Another object is to provide a horizontal grinder of the type described, which will be capable of fine adjustment for causing feeding of the grinding wheel independent of the adjusting mecha45 nism for the work support.

A further object is to provide a grinder having novel means for supplying a continuous stream of cooling fluid such as water to the grinding wheel of sufficient force and volume to keep the work 50 cool and to wash away the grit so as to maintain the grinding face clean, and which will also embody means for draining the water, provision being made for protecting the rotating parts of the machine. .

Another object is to provide a horizontal grind er having a horizontal table, work support, and a grinding wheel associated therewith, and one wherein the wheel will be mounted for rotation by means of a vertically mounted spindle, the spindle and power means for driving the same t all being adjustable to permit adjustment of the grinding wheel.

A further object is to provide an automatic feed and adjustable work holder specially adapted for association with the type of grinders disclosed, 10 the feeding having a separate drive and incorporating as an additional feature a hand operated feed whereby the work may be quickly brought into contact with the grinding wheel.

With these and various other objects in view, 15 the invention may consist of certain novel features of construction and operation as will be more fully described and particularly pointed out in the specification, drawings and claims appended hereto. ²⁰

In the drawings which illustrate an embodiment of the device and wherein like reference characters are used to designate like parts—

Figure 1 is a perspective view of the grinding machine constructed in accordance with the 25 present invention;

Figure 2 is a longitudinal sectional view taken substantially through the center of the machine shown in Figure 1;

Figure 3 is a transverse sectional view taken 30 along the plane indicated by line 3—3 of Figure 2;

Figure 4 is a sectional view taken along the plane indicated by line 4—4 of Figure 2;

Figure 5 is a fragmentary plan view, parts 35 being shown in section of the frame and grinding wheel and means by which the wheel is supplied with a cooling fluid;

Figure 6 is a detail sectional view taken along the plane indicated by the line 6—6 of Figure 5; 40

Figure 7 is a fragmentary elevational view showing the adjusting means for the work support;

Figure 8 is a fragmentary sectional view showing the spindle supporting a modified form of 45 grinding wheel; , ·

Figure 9 is a plan view illustrating a method of arranging a plurality of grinders for performing work on an article of usual width;

Figure 10 is a front elevational view, parts 50 being shown in section of the horizontal grinder of the present invention showing the same equipped with an automatic feed and a work nolding device;

Figure 11 is a top plan view of the grinder 55

2,0C showing the feed and work holder in operative positions; and

Figure 12 is a side elevation of the grinder with attachments as shown in Figure 10.

Referring to Figure 1 of the drawings, the invention is disclosed as comprising a supporting base or water pan 10, having marginal flanges 11, and provided with a plurality of spaced supports 12 upon which are mounted a box-like 10 frame indicated in its entirety by 14. The frame, as shown in Figure 4, comprises a plurality of end walls 15 and side walls 16, a portion of the left end wall being broken away to provide an opening 17 for permitting discharge of the waste 15 cooling fluid. In this connection the water pan iO is provided with a water channel 18 having a drain opening 19 and a supply opening 20, while at the opposite end of the channel means are provided for conducting the cooling fluid to 20 the grinding wheel, all of which will be presently described. The frame 14 houses the operating mechanism of the machine and is provided at its upper end with inwardly directed flanges 21 to which is secured at one end a stationary work 25 support or table 22. The table is provided with a marginal trough 23 which serves to conduct the waste cooling fluid to openings 24, as shown in Figure 6. The remaining work supporting surface includes a movable work support 25 pro30 vided with a marginal trough 26 which communicates with openings 24 for discharging the fluid as described. The work support 25 is formed with sloping bearing surfaces 28 formed, as more clearly shown in Figure 3, V-shaped and 35 which have bearing engagement with sloping co-operating bearing surfaces 29 provided on the side walls 16, respectively. This mounting of the work support 25 upon sloping bearing members permits the support to be raised or 40 lowered as desired by adjusting the position of the same on its supporting guides.

Adjusting means for the work support include, as shown in Figure 4, bearing members 30 formed on the right end wall 15 and which serve 45 to journal in the frame a transverse shaft 31, the shaft having a reduced portion 32 at one end, to which is secured by nut 33 an operating arm 34. Positioned centrally of the shaft 31 is a stud 35 having a reduced portion 36 fitting in an 50 opening in the shaft and by means of which and the nut 37 the stud is rigidly held to the shaft. Pivotally seemed to the upper end of stud 35 is link 38, the link having its outer end pivotally secured to the rear wall of the work support 55 25 by means of the lugs 40 and pin 4i. By the above construction it will be seen that to cause movement of the work support 25 on the guides 29 formed on the frame it will only be necessary to rotate the transverse shaft 31, the movement 60 being transmitted to the work support through the linkage described. A portion 42 of the frame 14 is indented, Figure 4, and has suitably secured therein a plate 43 provided with a horizontal slot 44. The arm 34 at its end oppo65 site its connection to shaft 31 is provided with a circular opening by means of which the adjusting disc 45 is rotatably fitted to the arm. A stud 46 is eccentrically located in disc 45 and is adapted to ride within the slot 44 so that the disc upon being rotated will function as an eccentric to cause a raising or lowering, as the case may be, of the adjacent end of arm 34. This movement of the arm is sufficient to cause the ₇₅ necessary movement of transverse shaft 31 in

1,687 order to impart the desired movement to the work support 25.

Located between the stationary table 22 and the movable work support 25 is an annular grinding wheel 48 mounted for rotation and for move- 5 ment vertically by means mounted within the frame which will be presently described. Positioned concentrically with the grinding wheel 48 is a circular plate 49 suitably secured to a discharge -disc 50, Figure 2, the disc in turn being 10 supported on the standard 51. The standard 51 at its lower end is formed with a reduced threaded portion 52, by means of which the same is threaded into the hub 53 formed on the base of the water pan. For conducting the cooling fluid 15 from channel 18 to the grinding wheel 48 the standard 51 is provided with a central bore 54 which communicates with opening 55 in plate 50. As shown in Figure 5, the surface of plate 50 is formed with a plurality of radially extending 20 channels 56, each channel having communication with the opening 55 and thus the bore 54. By the above structure the cooling fluid from the water channel 18 is conducted to a point adjacent the grinding wheel and is radially discharged 25 through channels 56 toward the inner surface of the wheel 48. Suitable means are provided, which will be presently described, for conducting the water from the trough 23 and discharging the same to any suitable receptacle positioned ³θ outside of the frame 14.

A feature of the invention is the provision of the stationary table 22, the circular table 49, which is likewise stationary, and which is preferably positioned so that its surface is in hori- ³⁵zontal alignment with the surface of table 22, Figure 2, and of the movable work support 25, the position of which can be adjusted with relation to the grinding wheel 48 and likewise the stationary supporting means 22 and 49. For ⁴⁰guiding the work on the supporting surfaces one side wall of the frame, as shown in Figure 3, is provided with supporting members 57, in which are pivotally supported arms 58. A longitudinal guide 60 is held to the members 58 by means of ⁴⁵tightening screws 6i, the screws being provided with a stud 62, by means of which they can be rotated, permitting the positioning of the guide 60 as desired. Provided on the stationary table 22 on the side opposite the guide 60 are supporting lugs 63 adapted to receive the depending arms 64 for suitably supporting in upright position the guide 65. In similar manner the work support 25 is also provided on the side opposite the guide 63 with lugs 63 for receiving the arms 66 so as ⁵⁵to support a co-operating guide 67.

In order to compensate for the wear of the grinding wheel 48 the same is mounted for movement vertically, the mechanism for accomplishing the same being located within the frame 14 ⁸⁰as shown in Figure 2. The wheel 48 is suitably mounted on plate 68, which in turn is secured by screws 69 to the horizontal flange 70 on the spindle 71. The spindle is mounted for rotation in a cylindrical spindle housing 72 by means of ⁸⁵the ball bearing assemblies 73 positioned at the upper and lower ends of the spindle, respectively. The housing 72 has integrally formed therewith a base 74 adapted to support an electric motor 75 for driving the spindle and the grinding wheel 48. ⁷⁰Also integrally formed with the spindle housing 72 are supporting guides 76, Figures 3 and 4, by means of which the housing and spindle rotatably supported thereby are mounted for vertical -,a, oo movement. Also integral with the spindle housing 72 and supporting guides 76 is a sloping or partition wall 78 having marginal upstanding flanges 79, the sloping wall 78 functioning to colli lect the waste cooling fluid discharged from openings 24 and deliver the same to a trough 80 formed integral with the end and side walls at the loft end of the frame.

For mounting the housing 72 and the base 10 and partition integral therewith for vertical movement within the frame (4, the side walls 16 are provided with vertically extending outwardly dished portions 8 f receiving guiding members 82, V-shaped in section, as shown in Figure 4. 15 Located between the guide members 82 and the portions 81 is a Babbitt-metal filler 83. Threaded bushings 84 are located at spaced intervals in portions 81, the bushings being apertured for receiving the securing bolts 85, by means of which 20 the V-shaped guide members 82 are secured to the frame.

The spindle housing 72 and parts integral therewith are supported within the frame 14 above the water pan ί 0 by means of a shaft 86 rigidly 25 secured by bolts 87 to the base of the water pan.

Shaft 86 is threaded at its upper end, the portion having threaded thereto a pinion 88 suitably located between an upper wall 89 and a lower wall 90 formed integral with the spindle housing 30 respectively. A ball bearing assembly 91 is positioned between the upper surface of the pinion 88 and the upper wall 89 in order to minimize the friction, tending to prevent rotation of the pinion 2« . Jⁿ_,^{Flgure 4 an} operating shaft 92 is shown pro<>5 vided with an operating handle 93, the shaft being suitably journalled in bearings 94 and 95, bearing 94 being integral with the spindle housing, while bearing 95 comprises a bushing threaded to the housing. Suitably keyed to shaft 92 is a 40 worm gear 96 mounted between ball bearing assemblies 97 and adapted to have meshing engagement with pinion 88 threaded to stationary shaft 86.

As the grinding wheel 48 wears, due to the 45 grinding operations performed by the same, it can be readily fed in a vertical direction so as to compensate for the wear by means of the construction above described, wherein the spindle housing 72, by means of guides 76 integral there50 with is mounted for vertical movement within the frame and which can be adjustably positioned vertically in the frame by rotation of the operating handle 93 rotating the worm gear 98 to in turn rotate the pinion 88. It will be clearly 55 seen, Figure 2, that rotation of the pinion 88 will, by reason of its threaded engagement with shaft 86, serve to position the pinion vertically on the shaft, and since the housing 72 and parts integral therewith are frictionlessly carried by 60 the pinion, the same will also be positioned vertically as desired. The spindle housing 72, however, has rotatably mounted therein spindle 71 _z carrying the grinding wheel 48 and thus the grinding wheel will have vertical movement in 65 accordance with the vertical adjustment of the housing.

The motor 7 5 forming the means for driving the spindle 71 has been described as supported on’ , base 74, the base being integral with the housing 70 The motor shaft 100 has suitably keyed thereto a sprocket 101 having meshing engagement with a chain drive 102, the chain also having meshing engagement with a sprocket 103 suitably keyed to the lower end of the spindle 71 so that rotation 75 of the motor is imparted to the spindle. A sprock),667 3 et lock nut 104 is threaded to spindle 71 below the sprocket 103 and serves to hold the sprocket in place vertically on the spindle. For supporting the chain 102 and to prevent sagging of the samp a fiber wear plate 105 is provided, the same being 5 positioned between base 74 and a bottom closure plate 106, which is suitably secured to the housing by means of screws 107. A lower spindle nut 108 is threaded to the lower end of the spindle 71 and completes the spindle assembly, while 10 at the upper end of the housing secured to flange 70 is a dust ring 109.

In the operation of the machine the grinding wheel 48 is adjusted so that its face is in horizontal alignment with the stationary table 22* and 15 circular table 49 which function as a support for the ground portion of the work. For supporting the work proper the movable support 25 is provided, the support being vertically adjustable so that the relation of the work with respect to the 20 grinding wheel 48 can be varied as desired to grind therefrom any thickness of metal. Movement of the support 25 on the sloping guides 29 can be accomplished by adjustment of disc 45 to cause rotation of transverse shaft 3 ί, which move- 25 ment is correspondingly imparted to the support through the linkage 35 and 38. The construction of the eccentric disc 45 is such that extremely minute adjustment of the work support is possible.

The grinding wheel 48, as has been described is mounted for frictionless rotation by means of the ball bearing assemblies 73 in the spindle housing and the spindle is driven from the motor 75 by means of the connecting chain 102. The 35 water channel 18 is adapted to be connected by means of opening 20 to any source of water supply under pressure, which is conducted by means of the bore 54 in the standard 51 to the mounting plate 50. The radial channels 56 discharge the 40 water toward the inside surface of the grinding wheel 48. It will be seen that part of the water only will work its way between the wheel and ' the circular table 49 and serve as a cooling medium and also as a means for washing the grit 45 from the face of the grinding wheel and the work The waste cooling fluid is collected by the troughs 23 and 26 and is discharged through openings 24 to the sloping partition 78 positioned directly below the openings and which in turn discharges 50 the fluid to the trough 80 where it is conducted to any suitable container located outside of the frame. The excess cooling fluid will be discharged through the opening between the spindle 71 and the standard 51 to the water pan 10 where 55 it can be collected by any suitable means.

In Figure 9 is shown an arrangement for operating the work of a width materially greater than the width of the grinding wheel 48. In this arrangement a plurality of machines are posi- 60 tioned in staggered relation, the grinding stone of one machine slightly overlapping that of the adjacent machine. It is necessary in this arrangement to detach from the machine the guides 60, 65 and 67 so that the work can travel from 65 θ ^suPP°^rtiⁿS surface of one machine to that of the other, as will be clearly understood.

In Figure 8 a modified \form of grinding wheel 148 is shown, the same being suitably mounted upon a mounting plate 150. The same structure 70 for mounting the plate and wheel for rotation is employed, including a spindle 171 having a horizontal flange 170, to which the mounting plate is secured, the spindle being rotatably mounted in a spindle housing 172. This form of grinding 75

2,000,667 plates that such a clutch is located in the housing 183. After the work has been brought into contact with the grinding wheel through the hand operated drive the motor 186 can be started, whereupon the endless chain is thereafter driven 5 at the desired rate of speed throughout the grinding operation.

A support 194 suitably secured to one side wall of the frame provides spaced lugs. 195 for journalling the arm 196, the same in turn piv- 10 otally secured to a second arm 197. As shown in Figures 10 and 12 this latter arm has mounted therein for movement vertically a rod 198 provided on one face with a rack 200 meshing with pinion 201 suitably secured to the transverse 15 sb aft. 202. The structure provides a work holder and for the purpose the rod 138 is formed tubular for a part of its length and receives the coil spring 203, the spring forcing the stud 204 downward and maintaining the same against a suit- 20 able stop. Shaft 202 is rotated through handle 205 and through rotation of the pinion 201 the rod can be located in desired position with respect to the supporting arm and work supporting surface of the grinder. Any form of adapter 25 206 is associated with the stud 204 for contacting the work on the grinder, the adapter being lowered and resiliently holding the work on the work supporting surface of the grinder through rotation of handle 205. After the desired tension 30 on the work is secured the parts can be locked in position through means of the ratchet/207 provided- on shaft 202 and pawl 208 pivotally secured to the support i 97.

The arrangement of automatic feed and work 35 holder cooperate to hold the work resiliently but firmly upon the work supporting surface of the grinder and to feed the work into contact with the grinding wheel at the desired speed. The work holder is universally supported upon the 4C support 194 and can be located directly over the grinding wheel where it is generally necessary to maintain the work firmly against its supporting surface, or if desired, can be located to either end of the frame. The provision of resil- 4: ient means for the work holder serves to maintain the work firmly upon the surface and to allow for vertical adjustment of the support 25. Also the provision of pivoted supporting arms for the holder allows the work to be fed automatical- 5( ly toward the grinding wheel by the feeding means disclosed and in addition adjustably supports the holder with respect to the work supporting surface. By lifting the pawl 208 the handle can be rotated to lift the adapter from the 5! work, and can be held in raised position out of the way of the work by merely releasing the pawl whereupon its Engagement with the ratchet holds the shaft 202 from rotation.

It is to be understood that I do not wish to be limited by the exact embodiment of the device shown, which is merely by way of illustration and not limitation, as various and other forms of the device will of course be apparent to those g skilled in the art without departing from the spirit of the invention or the scope of the claims.