US92242A - Improvement in truing grindstones - Google Patents

Description

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CHARLES E. WILSON, OF BOSTON, MASSACHUSETTS.

Letters Patent No. 92,242, dated July 6, 1869; antedated .Tune 19, 1869. y

IMPRQVEMBNT IN Tamise GaINDsToNns.

The Schedule referred to' in thse Letters Patient and making part of the Same.

ful Improvements in Truing Grindstones; anddo hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and-to the letters of reference marked thereon.

In the annexed drawings, making part of this specification- A A represents a grindstone-frame, whichis madein the usual way, but large enough to hold two stones.

B B represent the grindstones. v

These stones are provided with suitable' shaft-s, which have their bearingsin the movable boxes O O.'

These boxes O G rest upon the upper edges-of the flame A, and slide upon it, being moved by means of the screwsEE.` 4 s These screws pass through the stationary block D D, which are secured upon the upper edges of the frame.

Upon the outer ends of the stone-shafts, on o ne side of the frame, are secured the gear-wheels I I. y

Between the wheels I are situated two gear-wheels H H, which gear into each other, and then into the wheels I. i

l'Ihese wheels H. are placed upon short shafts G, which said shafts are secured liruily to a sliding T- sliaped frame L.

The leg or lower end of this frame L is slotted, and4 through this slot pass the two setfscrews 'm m. This frame is adjusted vertically, and secured in place by means ofthe set-screws m on.

, Upon the outer end of one of the shafts, G, is

The object of' this arrangement of gear-wheels and sliding bearings GO, is to so adjust the two grindstories iu the frame,v that their peripheries will touch each other when desirable for mutually levelling theirv When grindstones are much used in machine-shops 'y for sharpening up tools, their faces will in a short time become uneven, and in order to level their faces, they are made to run with these faces together, as has been stated. As the stones wear and becomesmaller, the frame L is dropped, and the bearings C C are moved inward, toward each other, just suiiiciently always to keep the peripheries of the stones together.

- 'lhe gear-wheels are so' arranged that, they will always gear together properly when the stones are touching. f 'lhe stones are driven bya band which passes over the pulley J. y y

When it is desirable to stop the motionv of the stones, the band is shifted to the loose pulley K. y

',Ihe gear-wheels are made of such sizes, ofcourse, as will run the grindstones at 'unequal speed.

Having thus fully described -rny invention, What I claim as new, and desire to secure by Leiv The arrangement of the grindstonesB B, in such a manner upon the frame A, that their peripheries will touch, so that when they are revolved at unequal speed, they will mutually level each others faces, the

same being adjusted substantially as herein set forth.

In testimony that I claim the foregoing, I have hereunto set my hand, this 14th day of October, 1867. CHARLES E. WILSON.

Vtnesses:

C. M. ALEXANDER, J. M. MASON.

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