US1556322A - Floating stone - Google Patents

Description

G. c. FAVRE FLOATING STONE Filed Nov. 16, 1923 INVENTOR szmmrwkz,

I BY W 7V AIiORNEY Patented Oct. 6, 1925.

' GEORGE e; FAVRE, asoummms, messen r assrenon m AMERICAN or;

a rman COMPANY; or sonrnnmn'enj 'lvmssncnusmrs, EA voLUNrA-mt Assoom *rmonrme sronnl Taallrwhlomitmay concern: v I Be i ikDQWH t at LG'EQRGE -.F 1 -E a! citizen o he- S is C nfederation, resid ng; at Southbridge, jin therlcountyof Worcester and State of Massachusetts, have invented certain new and useful Improvements in Floating Stones of which the following is a specification.

The present invention relates to an improved form of floating stone for use in connection with bevelled edging machines used in grinding both faces of an ophthalmic lens simultaneously.

An important object of the invention is to provide a floating stone of this nature and driving means therefor that will allow the stone to readily adjust itself to the various shaped lenses used and to facilitate driving of the stone at all times, without in any way interfering with the movement of the stone when in use.

Another object of the invention is to provide a device of this nature that will be strong, durable, comparatively simple and inexpensive in construction and that is exceptionally well adapted for the purposes for which it is designed.

Other objects and advantages of the invention will become apparent during the course of the following description.

In the drawings wherein like numerals are employed to designate like parts throughout the same,

Figure 1 is a front elevation of the invention partially in section for the purposes of illustration, 7

Figure 2 is a fragmentary enlarged detail of the driving connection, and

Figure 3 is a fragmentary sectional detail of the stone mounting.

In the drawings, wherein for the purposes of illustration is shown the preferred embodiment of the invention, the numeral 5 designates the driving shaft which is supported at one end as at 6 and at the opposite end as at 7 A suitable driving connection such as the pulley wheel 8 is keyed to one end of the shaft 5 and is adapted to rotate the same.

The shaft 5 is provided with the curved reduced portion 9 the thinnest point of which is at 10, as is clearly shown in Figure 1 of the drawings. The stone 11 is carried by the member 12 which may be in the form of I aplate-having the centrally disposed aperture 13 which is slightly larger than thefin ished portion;10; of the? shaft .5. --The plate 52 isc amfered asat'lk around theapertn-re 13, thus allowing the stone andmounting 12 to be rocked on the shaft 5.

A spanner 15 is keyed to the shaft 5 and has laterally extending fingers 16 which are adapted to engage with the balls 17 carried by the laterally extending fingers 18 which are formed integral with the plate 12. It will, of course, be understoodthat the balls 17 will be secured in a suitable pocket in the finger 18 so as to prevent accidental displacement thereof and at the same time will be so disposed that the portions 18 may be moved along the same with comparative ease. I

It will thus be seen that upon rotation of the pulley wheel 8 due to the fact that the spanner 15 is keyed to the shaft 5 the same will be rotated and the fingers 16 will en-.

gage the fingers 18 carried by the stone portion 12 and therefore the stone 11 will be rotated. When a curved lens is placed within the groove 19 of the stone, the stone will be slightly tilted or rocked, thus causing the finger 18 at one end to move along the pulley 17 in one direction and the finger at the opposite end in the other direction. Of course, the reduced port-ion 9 and the chamfered edges 14 will permit of the tilting of the stone 11 to whatever degree is necessitated by the curvature of the lens.

Of course many forms of spanners may be designed as well as the fingers 18. It is therefore to be understood that the form of my invention herewith shown and described is to be taken as the preferred embodiment of the same and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of my invention or the scope of the subjoined claims.

Of course, it will be seen and understood that this stone mounting is so arranged that it will adapt itself to any form of lens to be ground. In other words, a flat, toric or meniscus lens may be ground in the groove 19 of the stone and the lens contacting in the groove 19 will cause the said stone to receive the lateral displacements caused by the said lens. The lens will be held incontaot with the said stone as is ordinarily done, that is,

by means of clamping means carried by a rotatable shaft which accommodates a suitable former to rock the said lens clamping shaft to and from the stone, and resilient means to hold the lens in perfect contact with the stone at all times during the grinding operation, the stone being so mounted and adaptable to all forms of ophthalmic lenses will be of a universal nature and provide what may be properly termed a fioat in r grindstone.

aving thus described my invention, what I claim is:

1. A device of the character described comprising a shaft, a stone loosely mounted thereon, having fingers extending therefrom, a spanner keyed to the shaft and having fingers for cooperation with the fingers carried by said stone and ball members interposed between the said cooperating fingers.

2. A device of the character described comprising a shaft having a curved reduced portion, a stone having a centrally disposed aperture and chamfered portions arranged around the aperture to allow the said stone to rock on the shaft, fingers extending from the stone, a spanner keyed to the shaft and having fingers adapted for cooperation with the fingers carried by the stone.

GEORGE C. FAVE-E.

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