US2615288A

US2615288A - Grinding machine

Info

Publication number: US2615288A
Application number: US753142A
Authority: US
Inventors: Walter S Klay; Ralph E Price
Original assignee: Landis Tool Co
Current assignee: Landis Tool Co
Priority date: 1947-06-06
Filing date: 1947-06-06
Publication date: 1952-10-28
Anticipated expiration: 1969-10-28

Description

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Patented Oct. 28, 1952 GRINDING Mia i:

Walter S. Klay and Ralph E. Price, Waynesboro,

assignors to Landis Pa., Waynesboro, Pa.

Tool Company,

Application June 6, 1947-, Serial No. 753.142

This invention relates to machine tools particularly to means for supporting machine tool elements for angular adjustment in a horizontal plane. I I

The usual method ofmountin 'a machine tool element for angular adjustment-in ahorizontal plane is to provide a pivot or trunnion which determines the axis-about which the element is adjusted. The weight of the element is usually distributed uniformly over its entire under surface which rests on a corresponding surface on the base or other supporting member. When an element is in the desired position, it is usually secured by some suitable looking or clamping When a. change in position becomes necessary, the clamps are released and the element is shifted to the new position.

Where anelement such as the grinding wheel supportdisclosed herein must be so adjusted, the weight involved and the friction between the contacting surfaces is so great that considerable manual effort is required. The greater part of this effort is required to overcome friction. If friction could be eliminated, the weight may be shifted manually without excessive effort on the part of a. workman. Thus, the use of expensive mechanical or power devices is avoided.

It is therefore an object of this invention to provide an 'angularly adjustable tool mounting which will have a maximum of rigidity and a minimum of frictional resistance to adjustment.

A further object is to provide means for distributing the weight of the tool support.

A further object is to reduce the area of contacting surfaces by supporting and locating the support member on a single anti-friction bearing.

Figure l is a partial sectional front elevation of a, grinding machine having a grinding wheel support mounted for adjustment about a vertical axis.

Figure 2 shows a modified device for supporting the base for swivelling.

Figure 3 shows a second modified method.

In the drawings numeral l indicates the bed of a grinding machine, H an intermediate support member circular in shape and having an upwardly facing bearing surface I2 for engaging the bearing surface l3 of slide I'4. Said slide I4 has a V and a flat guide surface I5 and I6 respectively spaced apart thereon for slidably supporting a grinding wheelbase 20 for movement toward and away from an operative position. Thus, said grinding wheel may be fed at the angle to which said slide is adjusted.

A grinding wheel 2| is rotatably mounted on said wheel base in any suitable manner.

2 Claims. (01. ages Numeral 25 indicates a rack" mounted on slide 1 l4 and in operative engagement with a pinion 26 which may be drivenby any of the well known mechanisms to effect movement of .the grinding wheel 21 toward and from, and inlgr'indingposition. I

*A member 30 having a recess 3| therein is secured to bed H] by means of screws 32. A flanged trunnion member 33 isinserted in: said recess, in Which it may be adjusted vertically by means of an adjusting screw 34. The'purpose of this adjustment is. to vary the load on resilient washas, also. known as Belleville springs.

Said springs are placed around trunnion33 and rest on the flange thereof. The inner'ring 36v of-a tapered roller bearing is placed/on vsaid trunnionon top of saidsprings.

A circularplate 40 having a narrow annular surface 4| thereon for engaging the underside of slidel' i is secured to-saidslide by screws 42. Said plate has an inverted recess 43 on its underside shaped to receive a roller bearing outer ring 44 against a shoulder 45. The outer portion of said recess overlaps member 30 so as to prevent moisture and dirt from entering the bearing.

During a grinding operation, surface I3 of slide I4 is clamped by any suitable device to surface 12 of support member H to provide the rigidity necessary for the grinding wheel. During said grinding operation, when said surfaces are clamped together, a load is placed on springs 35 through the

bearing members

36, 44 and 46. Said loa-d may be adjusted by means of screw 34. When surfaces I2 and I3 are unclamped, springs 35, acting through said bearing members and plate 40, will lift slide I4 enough to take the load off said surfaces. Slide l4 and the wheelbase 20 will then be entirely supported on bearing rollers 46. Said slide may then be adjusted angularly with a minimum of effort. The tapered bearing not only supports the weight of the wheelbase, but also keeps it properly centered on the bed.

In Figure 2 is shown a modified version of the device shown in Figure 1. In this case fluid under pressure is substituted for the screw 34. A piston is slidably mounted in a bore 5| in member 30. Said fluid is supplied from any suitable source such as a pump to the lower end of said bore. The pressure in said racess may be constant or it may be used only when it is desired to adjust the wheel base 20.

In Figure 3 is shown a further modification. A disk is inserted into the recess in plate 40 occupied by bearing ring 44 in Figures 1 and 2. A member 6| having a single bore 62 takes the place of member 30 in Figures 1 and 2. A piston in this respect.

- said guide surfaces.

63 attached to or formed on the under side of disk 60 is slidably mounted in said bore 62.

In this case the fluid under pressure takes the place of both the screw and the anti-friction bearing and the base 20 may be adjusted angularly while floating on the body of fluid under pressure in bore 62. Fluid under pressure is supplied to bore 62 in the same manner as shown in Figure 2.

Obviously, types of bearings other than roller bearings may be used for supporting the base member. The invention is therefore notlimited We claim:

1. In a grinding machine, a bed, a support member on said bed having a broad bearing surface on the under side thereof for distributing the weight of said support member over'a corresponding surface on said bed, spaced guide surfaces on said support member, a grinding wheel base; having, correspondingly spaced guide surfaces for slidably mounting said base on said support member, an anti-friction bearing mounted'for vertical movement in said bed beneath the center of said support member, springs beneath said bearing, means for loading said springs so as to force said bearing upwardly, and means for preventing deflection ofsaid support member and said guide surfaces thereon due to the vertical force exerted on said bearing including an intermediate member mounted on said bearing and engaging said support member only at points spaced at least by the same amount as the weight of said support member over a correspondingsurface on said bed, spaced guide surfaces on said support member, a grinding wheel 4 base having correspondingly spaced guide members for slidably mounting said base on said support member, an anti-friction bearing mounted -for vertical movement in said bed, means for urging said bearing upwardly, and means including a plate between said bearing and said support member having a raised portionaround the outer edgefor engaging said support member to distribute the force exerted by said urging means and said bearing to points adjacent the outer edges of said support member whereby to prevent deflection of said support member and said guide surfaces.

WALTER. S. KLAY.

RALPH E. PRICE.

REFERENCES CITED The following references are of record in the flle of this patent: v UNITED STATES PATENTS 'Number Name Date- 856,662 Smith June 11, 1907 1,151,785 Hitchock Aug- 31,1915 1,232,999 Tolles July 10, 1917 1,391,039 Beach Sept. 20, 1921 1,551,739 Gough et al. Sept. 1,1925 I 1,758,534 Porter .-May 13,- 1930 1,836,482 Lyon et al. Dec. 15 1931 2,135,639 Gorham 1 Nov 8, 1938 2,208,499 Fiedler; July 16, 1940 2,335,712 Vitale Nov. 30, 1943 2,419,926 Waldron Apr. 29, 1947 2,429,710 DAvaucourt Oct. 28, 1947 FOREIGN PATENTS p Number Country I Date 110,527v Great Britain' Oct. 27, 1917 287,726

Great Britain Mar. 29,1928