US1447983A - Lens holder for use in lens grinding - Google Patents

Description

Mar. 13, 1923.

H. w. HILL LENS HOLDER FOR USE IN LENS GRIIiDING Filed Aug. 23, 1920 INVENTOR HARRY w HILL BY Marga ATTORNEYS Fatented Mar. 13, 1923.

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I-IARRY W. HILL, 0F SOUTI-IBRIDGE, MASSACHUSETTS, ASSIGNORKTO'AIVIERIGAN OPTICAL COMPANY, OI SOUTI-IBEIDGE, MASSACHUSETT SpA V O L.U1\TTARYASSO 0115331015" OF MASSACHUSETTS.

Lens HOLDEB'FOR USE IN invs enrnn ne Application fi led August 23, 1920, Serial No. 405,302.

To all whom it may concern:

Be it known that I, HARRYWVJIIILL, a citiZen of th'e United States, residing at Southbri'dge, in the county of IVorceste'rand State of Massachusetts, have invented certain'new and useful Improvements in Lens 'Holders for Use in'Lens Grinding, of which the following is a specification.

This invention relates to improvements in grinding machinery and has particular reference to machinery adapted for use in V the construction of ophthalmic lenses.

It is, th'ereforefthe object of my present invention toprovide a. novel and improved construction of lensblock or holder adapted to .receive and properly retainfaplurality --of lenses without the necessity of making use of pitch or other adhesive.

A further objectgo-f the inventipn is the provision of a. device which will hold the several lenses in exact predetermined position and in predetermined relationship one to the other so that accurate grinding of the several lenses to proper thickness may be accomplished.

A further object of the present invention is the provision of a device of this character in which the lens shall be firmly sup ported and liability of springing of the glass and thus of production of improper surfaces thereon eliminated.

Other objects and advantages of my improved construction should be readily apparent by reference to the following specifications taken in connection with the accompanying drawings, and it will be understood that I may make any modifications in the specific details of construction shown and described within the scope of the appended claims without departing from or exceeding the spirit of my invention.

Figure I represents a view of a lens grinding machine embodying my improvements.

Figure II represents an enlarged plan view of the block.

Figure III represents a bottom view of the block with the lens in position;

Figure IV represents a sectional view taken as on the line IVIV of Figure II.

Figure V represents a similar section.

al view at right angles vto'Figure'V as on the line VI-V I of Figure II. I

In the drawings, the numeral 1 designates a lower rotating spindle or shaft bearing;

on its upper end a suitable grinding'tool '2 adapted to operatively engage the lenses 3 carried by my improved lens block vvhich is held in correctr-elation to the tool as bythe pin or spindle 4;. i As shown, the lensfblock comprises a central or body portion 5 provided with an upstanding collar 6 enclosing the cone socket '7 to receive thelo-wer'jend of the spindle l and having fiextending out wardly from the centralfbody portion 5 a plurality of furcatedf'lens engaging members, each of said members being s'plitas at 9 and provided withithe' lugs 10 and -11] aid-- jacent the-slot 9. These lugs areadaptedto be connected as by the clamp screw '12to,

the furcated halves together and se- .curely clamp a lens in i position onlthe her 8. seat portion 13 having'its upper fac'eofp'rop'er curve to fit exactly the lens to be mounted thereon and solidly support the lens, said portion 13 being peripherally bounded by the upstanding rim or flange 14L so that as the screw 12 is tightened and the parts lOand 11 are drawn together the flanges 14 will clampingly engage the edges of the lens as is particularly illustrated in connection with Figures IV. and V. By reference to these views it will be seen that the lens is firmly supported throughout so that there is no possible springing of the glass during the grinding operation and it is satisfactorily clampingly held by edge engagement, leaving the free face to engage and be operated upon by a suitable grinding tool.

In order that the lens may be best inspected and its thickness determined by the skilled operator, etc., without the necessity of removing it, from the block, I coat the upper face of the seat 13 with a suitable layer of material which may be in the form of either pitch, felt, or heavy black paint,

lacquer or the like, which will have a certain softness though rigidity, tending not to scar the glass placed in engagement therewith and will give a black surface at the back of the lens, the advantage of which will be immediately apparent to any lens grinder.

From the foregoing description it will be seen that I have provided an improved con- 75 Said member 8 is [provided "with a they may be readily inspected as the grind- 1,447 see struction of lens retaining block adapted to receive .and properly retain a plurality of lenses having the proper shape to support the several lenses in such relation to each other that all of the lenses will be equally and evenly ground off and will all be ground to a uniform thickness, in which the lenses may be easily clamped in position or disengaged as desired, and in which through the provision of the black backing therefor ing operation progresses.

I claim: I

1. A lens block comprising a body portion having a plurality of furcated arms extending outwardly therefrom, said arms having lens seat portions and lens clamping projections on the arms adjacent the seats and means for drawing the furcations together to clampingly secure lenses in position on the seats.

2. A lens block comprising a body portion, a plurality of split arms radiating therefrom, said arms being of resilient material, said arms having lens receiving recesses formed therein, and means for springing the split portions of the arms together to clampingly secure a lens in position in the recess.

3. A lens block comprising a body tion having a plurality of outwardly extending split arms each formed on one face with a lens receiving seat and adjacent lens edge porengaging portions, and means on the opposite face for drawing portions of the arm together to clampingly secure a lens in position on the seat and retained by the edge engaging portions.

4:. A device of the character described comprising a body portion having a plurality of radiating split arm members, each of said arm members having a. recess formed in one face of curve to fit the face of a lens and having at the sides of the recess upstanding flange portions adapted toengage the edge of a lens, and means for springing the arm sections together to clampingly secure a lens in position on the seat.

5. A device of the character described,

comprising abody portion having a plurality of arms, each of said arms being centrally sub-divided and of reslllent material,

and having a lens receiving seatv formed on one face thereof, lugs formed on the opposite face of each of the arms, and a clamping device engaging the lugs of adjacent sections of each arm for springing them inward to clampingly secure a lens in position on the seat.

In testimony whereof I have affixed my signature, in presence of two witnesses.

HARRY W. HILL.

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