US2418085A

US2418085A - Surfacing machine

Info

Publication number: US2418085A
Application number: US488256A
Authority: US
Inventors: David E Mulholland; Kirk S Lawrence
Original assignee: WALTER S MULHOLLAND
Current assignee: WALTER S MULHOLLAND
Priority date: 1943-05-24
Filing date: 1943-05-24
Publication date: 1947-03-25
Anticipated expiration: 1964-03-25

Description

March 25, 1947. D. E. MULHOLLAND ETAL 2,418,085

' SURFACING MACHINE Filed May 24, 1943 18 Sheets-Sheet l March 25, 1947- D. MULHOLLAND ETAVL 2,418,085

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March 25, 1947. D. E. MULHOLLAND ETAL SURFACING MACHINE Filed May 24 1943 18 Sheets-Sheet l7 m 4 My;

March 25, 1947- D. E. MULHOLLAND ETAL SURFACING MACHINE Filed May 24, 1945 18 She'ets-Sheet l8 A l E E ms M w W w 6 M. I V W L; m 5 A g R sw w. a?

Patented Mar. 25, 1947 SURFACING MACHINE David E. Mulholland, Fort Myers, Fla, and Kirk S. Lawrence, West Reading, Pa.; said David E. Mulholland assignor to Walter S. Mulholland, Reading, Pa.

Application May 24, 1943, Serial No. 488,256

44 Claims. (Cl. 51-97) This invention relates to grinding or polishing machines and, while being especially advantageous in the surfacing of lens blanks, it is generally useful in forming curved surfaces wherever tances from the guideway so that the degree of curvature imparted to the work may be varied.

A still further feature of the invention resides in providing a work surfacing machine with an precision is required. 5 arcuate guideway along which the work is mov- The principal object of the invention is to proable to and fro in engagement with a, rotatable vide a machine for forming curved surfaces whose surfacing wheel and with means whereby the cendegree of curvature is independent of the curvater of curvature of the arcuate guideway may be ture of the surfacing means employed and is thus selectively positioned on either side of the face uneffected by wear of the surfacing means. of the work in engagement with the surfacin Another object of the invention istoprovide means so that, as desired, either a. convex sura surfacing machine which by simple adjustment face or a concave surface may be formed on the is selectively capable of producing any one of a Work great variety of curved urfaces Such, for. exam Still another feature of the invention consists ple, as concave or convex cylindrical surfaces of in mounting t e Wo holding means which either circular or non-circular sections,concave causes the work to move to and fro in a curved or convex spherical surfaces, and concave or conpa 1113011 a p v y m t beam Which is ex aspherica] surfaces v V capable Of being rocked to maintain the Work in A further object of the invention i to provide e m t W e Surfacing an the D a surfacing machine which may be successfully 2o otal mounting for the beam being vertically adoperated by comparatively unskilled workmen for .l'ust bletfl e le e a t mO as aw rapidly surfacing lens blanks with extreme pre- P a d and w y om e S r acing means. cision, it being possible by the presentinventi n 7 Yet another feature of the invention consists to surface a succession of lenses at a rate much n mounting a Work hOIdiIlg me r O a b se faster than any machine now in use and with which is adapted to swing to and fro in a curved a variation of less than .001 of an inch between p t d in a so iatin therewith means for movany two of them. ing the work holding means toward and away A primary feature of the invention consists in from th base as the latter w s t a d fro in providing asurfacing machine having a rotatable engagement with suitable surfacing means. surfacing means and a work holding means with 9 Other and more specific features of the invenmechanism for moving the holding means and tion, residing in advantageous forms, combinathe work to and fro in a curved path transversely s d l t s f Parts il hereinafter of the axis of rotation of the surfacing means pear and be pointed out in the claims. while maintaining the work in engagement with In the drawi the surfacing means. I Figure 1 is a side elevational view of a machine Another feature of the invention consists in embodyin the i I providing a surfacing machine with a curved u e 2 is a p ew f the machine'illllsguideway along which the Work to be surfaced is trated in Figure 1. v moved to and fro while in engagement with the Figures 3 and 3a are enlarged complementary work surfacing means. 4 longitudinal vertical sectional views of the ma- A further feature of the invention consists in chine, Figure 3 illustrating the left half thereof providing a work surfacing machine with means as viewed in Figure 1 and Figure 3a illustrating for moving the work to and fro in a predeterthe right half. T mined curved path in engagement with suitable Figures 4 and 4a are enlarged complementary r in me n nd in ass ciating t rewith longitudinal horizontal sectional views of the mameans for rotating the work as it moves to and fro chine, Figure 4 illustrating the left half thereof in engagement with the surfacing means. and Figure 4a the right half.

A still further feature of the invention consists Figures 5 and 6 are transverse vertical sectional in pl'ovlding a WQTk hDIding a s Whichis movviews taken on lines 5.5 and 6-.6 respectively able to and fro along a curved guideway for of Figure 3. causing the work to move in a curved path in en Figure 7 is a. vertical sectional viewtaken on agement with rotatable surfacing means, and in line l-'? of Figure 5.

also providing means whereby the holding means Figure 8 is a vertical sectional View taken on may be selectively positioned at different disline 8- of Figure 3.

I3l3 of Figure 11.

Figure 14 is a side elevational view of portions of the machine adjacent the work holding and surfacing means showing a device for supplying coolant to the work being surfaced.

blanks by using a wheel consisting of a hub portion H and a peripheral portion l2 composed of abrasive grains bonded in a resilient or elastic medium such as rubber or shellac. The wheel may be easily made rigid with the shaft and yet -be adapted to be quickly removed therefrom by Figure 13 is a detail sectional view taken on line Figure 15 is an end elevational view of theconof' the parts there illustrated being such as to produce aconcave surface onthe work.

Figurell'l is a transverse vertical sectional view 7 of a .form of grinding or polishing wheel suitable for forming a, concave surface.

.Figure 1.8 is a transverse vertical sectional view of a form of grinding or polishing wheel suitable for forming convex surfaces.

Figure 19 is substantially a diagrammatic view illustrating the relative position of various parts of the machine when set up to form a convex surface. 7 I I Figure 2D is substantially a diagrammatic view illustrating the relative position of various parts of the. machine when set up .to form a concave surface.

Figure 21 is aiview partly in vertical section and partly in elevation of a, slightly modified form ofwork'holding unit.

Figures 22 and 23 are views partly in'horizontal section and partly in elevation. of the work holding unit shown inFigure 21 equipped with different sized filler members.

Figure 24 is a plan view of one of the control units ofthe machine.

' Figure 25 is an enlarged transverse vertical sectional View, parts thereof being shown in elevation, of amodifiedform of the invention.

Figure 26 isa side elevational View of the form of theinventi'on illustrated in Figure 25. Figure 27 is aview' similar to Figure 25 of another slightly'modified form-of the invention. In Figure 28 is a vertical sectional view taken'on a line corresponding'to line 28 28 of Figure 2 illustrating a modified form of the invention capable of use with the modifications illustrated in Figures 25 to 27, inclusive.

"r Referring more particularly to the drawings wherein the invention is shown as embodiedin a machine particularly suitable for surfacing lens blanks, I.i'ndicat'es'a beam which is mounted for upon a suitable support 5. to one side of the beam isa' work surfacing means 6 consisting of a rotatable work engaging wheel I carried on the outer end of the shaft 8 which is effectively restrained from the slightest vibration by being journaled-within an elongated bearing 9 housed within a suitable bracket Ill. r

forming its hub with a central tapered opening for fitting over a correspondingly tapered extension 53 of the shaft and in providing the reduced outer end of the shaft with a screw threaded nut 14 which is adapted to coact with a thrust collar or washer l5 for forcing the wheel axially of the shaft.

On the inner end of shaft 8 are a pair of pulleys or sheaves it around which pass a pair of endless belts l'! adapted to be driven by pulleys l8 mounted on a shaft 19 of an electric motor 20. The electric motor is mounted on the same supporting base 5 as the work surfacing means 6. For a purpose which will hereinafter appear, the work surfacing means is vertically adjustable with respect to the beam l and consequently with respect to the motor 29. This adjustment may be accomplished by merely employing a removable block or member 2! which, when interposed between the supporting base 5 and the work surfacing means, maintains the latter. in an elevated position as shown in Figures 3a and 10. the block is removed however, the work surfacing means rests directly on the supporting base 5 and is thus supported at a lower elevation, as seen in Figures 16 and 20 of the drawings.

The work holding unit or device 4 comprises a base 22 and a spindle 23which extends through an opening in the base and is provided at its upper end with'a head or circular flange 2 The base 22 is adapted to move back and forth along the curved guideways 3 which are preferably arcuate in shape and it is formed on its under side with correspondingly shaped grooves into which the guideways extend.

As it isintended that the spindle shall be rotatable with respect to thebase, the'upper portion thereof is encased within a sleeve 25 formed of suitable anti-friction material and a washer 26 of the'same material may advantageously be in terposed between the head it of the spindleand the bottom of the circular recess in the base 22 in which the head is arranged. To maintain the spindle'in operative association with the base, a suitable'locking ring 2'5 be employed which is arranged in overlapping relation with both the head of thespindle and the adjacent portion of the base,'being rigidly secured to the latter'by any suitable means such as machine screws (not shown}. Mounted on the head ofthe spindle is a work holding member 28 on which a lens blank 29 is mounted in plaster of Paris or other suitable material 3L. Depending on the distance" at which limited pivotal movement upon a. suitable base it is-desired to support the lens blank above the.

beam, the work holding member 28 may be detachablysecured directly tothe head 2d of the spindle or one or morefiller blocks 35 may be in terposed between the work holding member and r When