US980133A - Lens-grinding machine. - Google Patents

Description

W. J. SLAVIN.

LENS GRINDING MACHINE.

APPLICATION FILED JAN. 15, 1910.

Patented Dec.27,1910.

INILNTOR.

(52 .4 TTORNE y.

UNITED STATES PATENT OFFICE.

-WILLIAM J. SLAVIN, OF HORSEHEADS, NEW YORK, ASSIGNOR T WINCHESTER OPTICAL COMPANY, OF HORSEHEADS, NEW YORK, A CORPORATION OF NEW YORK.

LEN S-GRINDING MACHINE.

Specification of Letters Patent.

Application filed January 15, 1910. Serial No. 538,314.

To all it may concern:

Be it known that I, WILLIAM J. SLAVIN, a

citizen of the United States, residing at Horseheads, in the county of Chemung and State of New York, have invented certain new and useful Improvements in Lens- Grinding Machines, of which the following is a specification.

My invention relates to improvements in lens-grinding machines for grinding intO shape the lenses used in spectacles or eyeglasses and for other similar urposes.

The invention consists in t e general construction of the. frame and parts which cooperate in holding the lens-pattern and the lenses as they are rotated and formed in conjunction with the grinding stone.

The main objects of my invention are to provide a new and better means to hold the lens-pattern, to facilitate its removal or readjustment, and more perfect cooperation with the lens holding heads, to provide for locating the lens-pattern to one side of the face of the stone close to and between bearings of the frame and where it is free from the washings of the stone, then again in providing. a multiple of quickly operated holder frame and its parts. Fig. 2 is a sec tional elevation of same but showing in addltion the lower operating shaft on which the lens holder frame is mounted to oscillate toward and away from the grinding stone, and boxes of the main frame broken away supporting said shaft, with pinions thereon which impart rotation to the upper gears and shafts of the holder. Fig. 3 is an end elevationpartly of Fig. 1 in direction of the arrow C. Fig. 4 is a perspective view of the shaft cap serving to lock two of the shafts together while gripping the lens-pattern between them. Fig. 5 is a perspective View of the lens-pattern. Fig. 6 is a perspective view of the central shaft which has at one end one of the lens holding heads, and

Patented Dec. 27, 1910.

at the other end a flattened part with shoulder for holding the lens-pattern. Fig. 7 is a View of same parts as Fig. 6 looking directly at the flattened end of the shaft. Fig. 8 is a view in elevation of the grinding stone and other parts of a lens grinding machine showing the relation of my improved lens and pattern holding device therewith on section A AFig. 1.

With reference to the drawings 1 represents the bod portion of the frame of my improved hol er, its lower part formingthe boxes 2 and 3 which support the holder frame on the shaft 4 which is journaled in raised boxes 5 and 6 of the main frame 7 of the grinder. Between said raised boxes and those of the holder frame are the pinions 8 and 9 made fast on the shaft 41 and intermeshing with the gears 10 and 11 which serve to rotate the shafts 12,13,14 and sleeve 15 journaled in the boxes 16, I7 and 18,

which form the upper part of the holder frame. Fig. 8 illustrates a means for rotat ing said shaft 4, such as may be imparted from the shaft of the grinding'tstone.

Shafts 12, 13, and 14, are arranged in the same axial line, the shafts 12 .and 14 are made to slide endwise in their bearings, the center shaft 14 being free to slide in direction of the lens gripping heads until withdrawn from coupling with the cap 1.) fixed on the shaft 13 and releasing the lens pattern 20 so it may be freely removcd or replaced.

The knurled disk 21 provides means by which the shaft 12 may be quickly reciprocated by hand to bring the lens holding head 22 to hear on a lens placed between it and the head 23 of the central shaft 14, at which time to make the grip on the lens more complete, or of such pressure as may be desired, a check nut 24 threaded on the shaft 12 and knurled on its periphery may be screwed to lock with the face and shouldered end 25 of the sleeve 15. As thus locked it will be seen that the end ressure .of the shafts while gripping the ens firmly inrinding will also grip the lens-pattern, an that the end thrust of said shafts will not materially affeet their rotation because of the ball-bearing rings 26 and 27 suitably housed'wlth .made by the cap 19 on shaft 13.

balls-and counteracting rings 28 and 29, lo-

cated adjoining the frame boxes and baclg of the shoulder at the inner end of the sleeve which rotates with shaft 12, and shoulder cap 19, and to the end of the shaft 14 fitted to. nicely pass through said openings in the pattern and cap up to a shoulder which engages the side of the pattern, the shaft 13 having a hole drilled in its capped end sufiiciently large to not interfere with the end 31 of the central shaft 14 as it passes throu h the cap in being coupled therewith.

Re erring to Fig; 8 the lens-pattern is shown in contact with an arm 32 made adjustable to slide in the way 33, by means of the hand'screw 34, held in the standard 35 bolted to the frame 7. By turning the screw with the knurled disk 36 the arm 32 may be moved toward or' away from the axis of the stone, vmoizin the lens so it may be ground on the perip iery of the stone to such diametrical measurement as .may be desired,

the connectin gearlng revolving the lens inopposite direction to that'of the stone. Oscillation is given the holder frame as the differential diameters of the pattern come in its rotation, being held thereto by the spring 37 connected to.

contact with the arm in the journal box of t e stone and pulling fromthe top of the holder frame.

' It will be seen that the shaft 12 is given revolution only at such times as the check nut 24, threaded on said shaft, looks it together with the sleeve carr ing it and 0 which the car 11 is made ast.

The sha ts 12 and 14 at their adjoining ends are turne "down to form a reduced end and shoulder 38 and 39 on and against which the lensholding heads 22 and 23 are mounted, said heads being covered onetheir abutting faces wit-h pads 40 made of rubber or other suitable material for accommodating sec, 133

themselves to uneven surfaces, and to hold box, said central shaft having a central and squarely formed tenon with shoulder for taking on the lens pattern at one end and the lens gripping head at the other for cooperation with two outer shafts.

2. In a lens grinding machine, the combination with the grindin stone of a lens holder having a central iox independent and intermedlary of two outer boxes, an independent shaft in the central box, a lens patternwith a squared hole through its center to engage the vcentral shaft, an outer shafttwith cap with a squared central-hole to also engage the central shaft and the lens pattern, and another outer shaft reciprocable to and from the vided with a thread and nut for engage ment with a rotatable sleeve for carrying and rotating said shaft.

3. In a lens-grinding machine, in combination, a holder frame supported by two lower boxes, and having one central box and twb end boxes in its upper portion, a shaft independently journaled in each of the up per boxes, the central shaft having a lens gripping head on e side of its box and a o ;the other side, its

squared tenon en gripping head communicable with a head onr'one ofthe outer shafts, and its tenon" end communicable with a squared hole, through the center of the lens former and the center of a cap covering the end of the other outer and rotatablydriven shaft.

In testimon whereof I lafiix my signature in presence 0 two witnesses.

' WVI'LLIAM J SLAVIN. \Vitnesses ORLIE JAYNE, C. J. LANGDON.

machine, the com.- 55

central shaft and pro- 75

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