US2735240A - Grinding wheel mounting - Google Patents

Description

FebQZl, 1956 J. R. FRIES ET AL 2,735,240

GRINDING WHEEL MOUNTING Filed Dec. 15, 1950 3 Sheets-Sheet l INVENTOR JOHN E. FRIES Mqflaca E. BILLS/G5 ATTDIENE Y Feb. 21, 1956 J. R. FRIES ET AL 2,735,240

GRINDING WHEEL MOUNTING Filed Dec. 15, 1950 3 Sheets-Sheet 2 I l\\\ g & :3

N N\/ 7 f 4 4 z I p '1// M i V \W%\\\\\\\ Hi A L INVENTOR JOHN 1?. Felts BY #42040 ENE/M51658 ATTORNEY Feb. 21, 1956 J FR|Es ETAL 2,735,240

GRINDING WHEEL MOUNTING Filed Dec. 15, 1950 3 Sheets-Sheet 3 INVENTOR JOHN R. FRIES l/HRGLD 5.541.5/651? ATTORNEY ed States Patent 2,735,240 GRINDING WHEEL MOUNTING Application December 15, 1950, Serial No. 201,006 4 Claims. (Cl. 5l--166 This invention relates to means for rotatably supporting a grinding wheel in a grinding machine.

The conventional grinding wheel mounting usually consists of a grinding wheel spindle rotatably mounted in spaced bearings in a wheelbase. The grinding wheel is mounted on a tapered portion at one end of the spindle and a driving pulley on a tapered portion at the other end of the spindle. The principal defect of this type of mounting is the fact that the grinding wheel and the driving pulley are at opposite ends of the spindle. The conflicting forces acting on the spindle as a result of this arrangement result in inaccuracy in the grinding operation. It is, therefore, an object of this invention to provide a grinding wheel mounting in which the driving means will be mounted adjacent the grinding wheel instead of being spaced therefrom.

A further object is to provide a non-rotatable spindle mounting.

A further object is to provide a grinding wheel center rotatably mounted on a stationary spindle.

A further object is to provide a bearing which automatically adjusts itself.

A further object is to provide a sealed, circulating lubrication system through the stationary spindle.

A further object is to provide an automatic end thrust hearing.

A further object is to provide a grinding wheel center having a pulley portion for transmitting rotation from a driving motor to the grinding wheel.

In the drawings, Figure 1 is a sectional front elevation showing the invention adapted to a conventional grinding machine.

Figure 2 is an end elevation, partly in section, showing the driving motor and the structure of the bearings supporting the grinding wheel.

Figure 3 is a front elevation, partly in section, showing a method of mounting a grinding wheel where the machine is designed to accommodate this type of mountmg.

Numeral indicates the bed of a grinding machine; 11, a wheelbase slidably mounted thereon having a V guide 12 and a fiat guide 13 laterally spaced therefrom. A stationary spindle is supported at one end in a portion 21 of the wheelbase 11. Said spindle extends outwardly through a wheel fender 22 attached to wheelbase 11. The end plate 23 for said wheel fender has an enlarged center portion 24 in which the other end of spindle 20 is mounted. Between the points of mounting of said spindle are two axially spaced sets of shoe-type bearing members 30 and 31.

Said bearing members are circumferentially spaced about said spindle and pivotally mounted thereon. A wheel center 35 has a more or less conventional flanged portion 36 and a flanged mounting ring 37 for securing a grinding wheel 38 thereon. A portion 39 of said center extending beyond said flanged portion has a plurality of V grooves 40 for receiving driving belts 41. Said belts run to a pulley 45 on wheel drive motor 46. A partition An increase in grinding load on any r the 42 in fender 22 13i'ovids sepia-rare comp rtment" to: are grinding wheel and the pulle p6" n 39. su hie lubricant sea'ls 50 and 51 are provided Between. s a wheel center 35 and spindle 20. The ciia r formed by said seals and wneel center is supplied withv lubricant through the spin'dlezo' by of passage 52' and pie sage 53 in portion 21,

Members 30 and 31 are cireunirerentiall'y spaced about said sp'ifidl at intervals of 1207 Escher the ineir'tbers" so is main 'n'oufit'en iii spindle 20. The radius or are bearing s rface or each ifieniber is' slightly less than he bore of the wheel eenter ss. This difierence in rdius' permits the formation or a film or lubricant between member 30 and the iiiternalsiirface' of wheel center 35 V eiri'bers 30' would be applied at that ortion of the" meme 3 near-g est the pivot point and would tend to rotate member 30' in a clockwise direction, urging the longer end of the member against the internal surface of wheel center 35 and offering an increase in bearing pressure to counteract the above mentioned increase in load.

The means for adjusting clearance between bearing shoes 30 and the internal surface of wheel center 35 consists of pistonlike members 60 and 61 slidably mounted in a radial bore 62 in spindle 20. Adjustment of said members in said bore is effected by means of adjusting screw 63, also radially mounted in spindle 20 and adapted to engage the inner end of member 61. One or more Belleville springs 64 inserted between members 60 and 61 serve to provide pressure of all bearing shoes 30 against the internal surface of wheel center 35. A similar device is used in connection with members 31. Since the members are spaced peripherally at 120, adjustment of one is applied with equal force on the other two and thus only the one adjusting means is necessary for each set of shoes.

In Figure 3 there is shown a different method of mounting the grinding wheel on the bed. In this arrangement, the wheel support has a V guide 71 directly beneath the grinding wheel, and a flat guide 72 directly beneath the pulley portion. Corresponding bearing surfaces are provided in the bed 75. This arrangement is preferred where the machine is to be designed to receive this particular type of Wheel mounting.

We claim:

1. In a grinding machine, a base, a support for a grinding wheel on said base, a stationary spindle mounted on a said support, peripherally spaced bearing members on said spindle, a single adjusting means in said spindle acting radially on one of said bearing members, the peripheral spacing of said bearing members being such that said adjustment effects all of said bearing members equally, and a grinding wheel mounted for rotation on said bearing members.

2. In a grinding machine, a base, a support for a grinding wheel on said base, a stationary spindle having one end mounted in said support, peripherally and axially spaced shoe type bearing members on said spindle, a sleeve rotatably mounted on said bearing members, a grinding wheel mounted on said sleeve, means to rotate said sleeve and grinding wheel, means to automatically adjust one of said bearing members comprising a spring pressed plunger, said plunger serving also to adjust said other bearing members as a reaction to the force which it exerts on said one bearing member.

3. In a grinding machine, a bed, spaced guide surfaces on said bed, a grinding wheel support slidably mounted thereon, a spindle having one end mounted in said support, shoe type bearing members peripherally spaced about said spindle and pivotally mounted thereon, a grinding wheel center rotatably mounted on said bearing members, a grinding wheel mounted on said grinding Patented Feb. 21, 1956 wheel center, the bearing surface of each of said bearing members having a radius less than that of the contacting surface of said wheel center, the pivot point on each of said bearing members being near to the trailing edge thereof so that a lateral movement of said grindingwheel caused by an increase in load thereon will cause each of said bearing members to move about said pivot so that the leading edge of each bearing member will be urged outwardly to counteract the lateral movement caused by a load on said grinding wheel.

4. In a grinding machine, a bed, a grinding wheel support mounted thereon, a spindle heaving one end mounted in said support, shoe type bearing members peripherally spaced and pivotally mounted on said spindle, a grinding wheel center rotatably mounted on said bearing members, a grinding wheel mounted on said grinding Wheel center, said center having a grooved portion which serves as a. pulley, said grooved portion being located between the grinding wheel and the grinding wheel support whereby power for rotating said wheel is applied at a point of maximum rigidity.

UNITED STATES PATENTS Connor et a1 Oct. 24, Cook Nov. 26, Martin June 27,

Kingsbury Nov. 17, Scholer May 15, Newbigin Nov. 18, Barnes Apr. 5,

Lange .1 Dec. 16,- Noble Feb. 25, Doran July 14, Haas Mar. 2,

Hill Mar. 23,

Blood Nov. 19,

Messinger et a1 Aug. 1, Peskin Nov. 21, Wilson Dec. 18, Sweetser Nov. 7,

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