US1587865A - Grinding machine - Google Patents

Description

`une 8 1926.

F. SCHNEIDER GRINDING MACHINE 1921 2 Sheets-Sheet Filed Sept. l2.

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June 8 1926.

F. SCHNEIDER GRINDING MACHINE Filed sept. 12, 1921 2 Sheets-Sheet 2 Patentes June s, 1926.

UNITED STATES PATENT oFFics.

FRANKLIN SCHNEIDER, OF CLEVELAND, OHIO, ASSIGNOR TO THE VAN lDOEN ELEC- TRIO rIOOL COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

GRINDING MACHINE.

Application led September 12, 1921. Serial No. 499,958.

My invention relates to improvements in grinding machines, and more particularly to a self-contained mechanism preferably comprising an interposed electric motor and two opposing abrading discs driven by `said motor.

The object of my invention is the construction of a satisfactory and eiiicient grinding machine wherein the alignment is permanently insured, long bearings and supports are adorded for the grinding discs, and easy assemblage is secured. Further subsidiary objects will appear in connection with the detailed description of my ,invention and its embodiment.

The mechanism herein set forth as embodying my improvements may be generally described as comprising an electric motor mounted intermediately of a relativ-'f :ly long driving shaft, which shaft is supported adjacent to its ends by widely displaced ballbearings, and terminally mounts the two grinding discs adapted to be driven by the motor and shaft. The ball-bearings are contained within two separate cylinders or quills; one of which is anchored to the frame oi the machine and the other is afforded a slight longitudinal movement therein. The concentric hubs of the motor casing also are permitted a slight longitudinal movement with respect to the trarne, in common with the driving shaft.

Further details of my improved construction and the advantages inherent therein may he more readily understood by making reference to the acompanying drawings, wherein:

Figure l ot the grinding machine embodying my invention; the lower trame being broken away and the bearings being shown in vertical section.

Fig. 2 is a plan view of the leithand porg tion of: said grinding machine showing the.

bearing-block removed,

Fig. 3 is a vertical section through the,

righthand end of said machine on line 3 3,

Fig. l, and Fig. 4 is a similar section illustrating the motor parts and conventionally 5G showing a complete frame.

Throughout the several figures of the drawings I have employed the same character of reference to indicate similar parts.

The upper portion of the 'frame a is reis a view of the upper portion concentric hubs b' turned thereon, throughV the shaft e, mounting the motor armature, extends beyond the ends of the frame, and

mounts the grinding discs f; Said hubs b are of the same diameter as the extremities of the quills c, so that the boxing may be set up tightlyagainst the hubs and retain the bearings and shaft in alignment and the ends of the extended shaft against deflection or whipping. By removing the upper halves of the boxings the single shaft e extending from abrading wheel to abrading wheel, together with all its surrounding supporting and driving parts, including the relatively stationary and rotating parts of the bearing structures and both the relatively and stationary motor parts may be lifted as a unit from the frame and may be handled as a unit. This arrangement enables the shaft and its accompanying parts to be readily assembled on the bench and the nal assembly in the frame to be simplified. Further, as

" will later appear, by providing properly aligned or co-aXial seats for the bearing structures and the hubs of the stationary motor part, true concentricity or co-axial relationship of all of the operating parts of the mechanism is secured and maintained.

The outer ends ofthe quills house double hall-bearings c and the inner ends are provided with single ball-bearings c', respectively, which are spaced at such distances asA to aii'ord a rigid rotatingsupport for each rinding disc and its shaft section.

llt will be observed that the lefthand quill is rigidly pinned within the boxing by the stud or pin g w'jhich enters the hole g' bored therefor in the enlarged cylindrical end portion c2. A stud or pin h enters a slot in the lefthand extremity of the righthand quill c, and, similarly, a stud z' enters a slot in the lefthand hub o o the motor housing. Accordingly, it is apparent that the alignment of the shaft and bearings will be preserved, since the slight longitudinal movement thus adorded bythe slot-engaging studs or pins, prevents any dedection of the relatively long shaft e.

Each grinding disc is freely accessible to its operative from three sides and the strains incident to its use are taken up by the widely separated bearings c', c, ol its individual quill, supplemented by the corresponding bearings ot the opposing quill. Consequently, very pronounced rigidity and eciency 'are obtained in my improved construction.

Having now described the preferred embodiment of my invention and certain advantages inherent therein, ll claim as new aand desire to secure by Letters Patent, the following:

l. ln combination, a single shaft providedwith means for supporting tools on its ends,

' separated bearing structures spaced along said shaft and each including a relatively stationary part and a relatively rotating part, the latter secured to the shaft, said.

caring structures being each symmetrical about the axis of the shaft, `and a support therefor provided with spaced holding mem.- bers having axially aligned symmetrical portions to receive and hold said relatively stationary bearing parts, and driving Ameans lor said shaft. including relatively stationary and rotatable motor parts, the relatively rotatable motor part bemg secured to the shaftbetween said two bearing structures, and means for maintaining sald relatively l stationary motor part concentrically related to the axis of said shalt and stationar with respect to said rotating part, and inc uding means on .said relatively stationary motor part cooperatively lrelated to said holding members for holding said relatively stationary motor part against rotation.

2. llnl an abrading machine, the combination ot" a single shaft providedwith means tor supporting abrading tools on its ends, spaced bearing structures each co-axial with and exteriorly syetrical to the axis of said shalt, drivin means for said shaft located between `/sai bearing structures, a supporting frame havingcspaced supporting and holding members provided with aligned openings, said members and their o enings being arranged to receive and snugy hold vsaid bearing structures, one of said members being arranged to hold its bearing structure against longitudinal movement, and the other being arranged to permit longitudinal shifting therein of its bearing structure to accommodate any tendency toward longitudinal shitting thereof.

3. lln an'abrading machine, the combination of a single shaft provided with means for supporting abradingtools on its ends, spaced exteriorly syetrical bearing structures upon said shalt, each including s aced bearings, a rotating motor part rigi y secured to said shaft between said bearing structures, a stationary motor part surrounding the other motor part upon the shaft, and a support provided with spaced holding members having aligning parts conforming' to the external configuration of the bearing structures for supporting and holding the same, means for clamping one of said bearing structures in its holding member and thereby holding it against movement, means tor snugly holding the other bearing structure in its holding member and permitting longitudinal movement therein, and means for supporting the stationary motor part with circumiterentially uniform clearance between it and the rotatin motor part.

d. ln an abrading machine, the combination of a. single shaft provided withv means for supporting abrading tools on its ends, spaced 'exteriorly symmetrical bearing structures upon said shaft, each comprising an inner rotating bearing part secured to the shaft 'and an outer relatively stationary bearing part with spaced bearmgs between said parts, a relatively rotating motor part secured to said shaft between said bearing structures, a relatively stationary motor part surrounding said rotating motor part with the usual motor clearance therebetween, a supporting part for said relatively station- `ary motor part, and supporting means for all of Psaid parts, comprising a frame havingspaced supporting members provided with aligned openings and adapted to receive and snugly hold said bearing structures and the supporting part for said relatively stationary motor part,I

5. lin a machine ot the class described, a tool supporting and driving unit, compris- ,ing a single shaft having tool supporting,

means at lts extremities, two bearing structures spaced along said shaft, each comprising rotatably connected relatively stationary' and rotating bearing parts, the latter connected to the shaft and the former beingjexteriorly setrical therewith, and driving means tor said shalt including an elect-ric motor having a rotating motor part connected to said shaft between said structures and exteriorly symmetrical with the shaft axis and a relativel stationary motor part provided with a cavity in which the rotating motor part rotates and also having a supporting part, said cavity and supporting part being symmetrical about the shaft axis, whereby said stationary bearing parts and motor supporting part may be secured to a support in co-axial relation to thereby securev and maintain circumterentially uniform motor clearance.A

ln testimony whereof l do now ar my signature.

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