US3563301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for generating a lens
Assignee: SHURON CONTINENTAL DIVISION OF
•
Filing: 1969-03-21
•
Granted: 1971-02-16
•
Expires: 1989-03-21
Abstract
Abstract The apparatus includes a mold having a cavity open at its upper end, and containing two sets of spaced projections defining two reference lines extending diametrically of the cavity. One set comprises a pair of pins mounted on opposite sides of an angularly adjustable ring, which surrounds a piston that is axially reciprocable in the bottom of the mold for ejecting molded blocks therefrom. The second set comprises either two wedge-shaped formations on opposite sides of the cavity wall, or two pins projecting from the face of the piston. The blank, that is to be blocked, is placed sealingly over the upper end of the mold with a layout line thereon registering with the second set of projections. The ring is then adjusted until the line defined by said pins corresponds to the desired cylindrical axis for the blank; and molten blocking material is then fed to the cavity to mold to the blank a block which will contain recesses corresponding to said sets of projections.
Inventors
- 👤 Richard J Mccall
- 👤 Robert C Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:15
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/005; B24B13/0052; B22; B22D; B22D17/00; B22D17/20; B22D17/22; B22D17/24; B22D19/00; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
182 words
Lens-blocking apparatus comprising: a mold having a mouth exposing a cavity therein; an annular seat around said mouth for supporting a lens blank over said cavity; a collar mounted in the bottom of said mold cavity for movement axially and rotatably about an axis disposed centrally in said cavity normal to the plane of said mouth; spring means urging said collar axially toward said mouth; a piston mounted in said collar for limited axial movement therewith and fixed against axial rotation; abutment means between said collar and said piston to prevent relative axial movement therebetween at least while said spring means is biased; bearing means on said collar and exposed by said mouth to provide bearing points on the finished lens block for the transmission of generating forces to the lens; means on said piston and exposed by said mouth to provide an indexed mount on the finished lens block for mating with a chuck; and said cavity being adapted to have molten metal supplied thereto for molding the lens block therein and adhering it to the lens blank to be blocked.
Claim 2
Dependent Claim
182 words
Lens-blocking apparatus comprising: a mold having a mouth exposing a cavity therein; an annular seat around said mouth for supporting a lens blank over said cavity; a collar mounted in the bottom of said mold cavity for movement axially and rotatably about an axis disposed centrally in said cavity normal to the plane of said mouth; spring means urging said collar axially toward said mouth; a piston mounted in said collar for limited axial movement therewith and fixed against axial rotation; abutment means between said collar and said piston to prevent relative axial movement therebetween at least while said spring means is biased; bearing means on said collar and exposed by said mouth to provide bearing points on the finished lens block for the transmission of generating forces to the lens; means on said piston and exposed by said mouth to provide an indexed mount on the finished lens block for mating with a chuck; and said cavity being adapted to have molten metal supplied thereto for molding the lens block therein and adhering it to the lens blank to be blocked.
Claim 3
Dependent Claim
28 words
The lens-blocking apparatus of claim 1 wherein said piston has an axial recess in it, and a shield plug is inserted in said axial recess in said piston.
Claim 4
Dependent Claim
163 words
Apparatus for molding a lens block to a lens blank of the type having thereon a horizontal layout line, comprising: a mold having a cavity open at its upper end and adapted to receive a supply of molten blocking material; first reference means in said cavity defining a first pair of spaced points that lie in a diametral line through the axis of said cavity; second reference means in said cavity defining a second pair of spaced points that also lie in a diametral line through said axis; means for supporting a lens blank sealingly over the upper end of the mold with its horizontal layout line registering with one of said pairs of points; and means for angularly adjusting one of said reference means relative to the other about the axis of said cavity, thereby to effect a corresponding angular adjustment between the diametral lines represented by said first and second pairs of points, respectively, before molding a block to said blank.
Claim 5
Dependent Claim
163 words
Apparatus for molding a lens block to a lens blank of the type having thereon a horizontal layout line, comprising: a mold having a cavity open at its upper end and adapted to receive a supply of molten blocking material; first reference means in said cavity defining a first pair of spaced points that lie in a diametral line through the axis of said cavity; second reference means in said cavity defining a second pair of spaced points that also lie in a diametral line through said axis; means for supporting a lens blank sealingly over the upper end of the mold with its horizontal layout line registering with one of said pairs of points; and means for angularly adjusting one of said reference means relative to the other about the axis of said cavity, thereby to effect a corresponding angular adjustment between the diametral lines represented by said first and second pairs of points, respectively, before molding a block to said blank.
Claim 6
Dependent Claim
125 words
Apparatus as defined in claim 3 wherein: said first reference means comprises a first pair of spaced projections in said cavity operative, when a block is molded to said blank, to form in said block a corresponding first pair of recesses for use in cylindrical generation of thE blank secured to said block; said second reference means comprises a second pair of spaced projections in said cavity operative to form in said block a second pair of corresponding recesses the centers of which register with the horizontal layout line of said blank; and said adjusting means is operable to rotate said first pair of projections into an angular position, relative to said second pair of projections, corresponding to the desired cylindrical axis of said blank.
Claim 7
Dependent Claim
182 words
Apparatus for molding a lens block to a lens blank, comprising: a mold having a cavity open at its upper end and adapted to receive a supply of molten blocking material; means for supporting a lens blank sealingly over the upper end of the mold in spaced relation to the bottom of the mold, and in position to have said molten material adhere thereto as a block upon cooling; a pair of spaced, parallel pins projecting from the bottom of said mold into said cavity; a first member mounted in the bottom of said mold for axial reciprocation into and out of said cavity to eject a molded block therefrom; means in said cavity defining a reference surface disposed parallel to a plane containing the axis of said cavity, and operative to form a corresponding reference surface on the block molded in said cavity; and a second member rotatably mounted in the bottom of said mold to adjust, respectively, the angular positions of said pins, and the means defining said reference surface relative to one another about said axis of said cavity.
Claim 8
Dependent Claim
182 words
Apparatus for molding a lens block to a lens blank, comprising: a mold having a cavity open at its upper end and adapted to receive a supply of molten blocking material; means for supporting a lens blank sealingly over the upper end of the mold in spaced relation to the bottom of the mold, and in position to have said molten material adhere thereto as a block upon cooling; a pair of spaced, parallel pins projecting from the bottom of said mold into said cavity; a first member mounted in the bottom of said mold for axial reciprocation into and out of said cavity to eject a molded block therefrom; means in said cavity defining a reference surface disposed parallel to a plane containing the axis of said cavity, and operative to form a corresponding reference surface on the block molded in said cavity; and a second member rotatably mounted in the bottom of said mold to adjust, respectively, the angular positions of said pins, and the means defining said reference surface relative to one another about said axis of said cavity.
Claim 9
Dependent Claim
46 words
Apparatus as defined in claim 5, wherein: said pins are mounted on one of said members for movement therewith; and said means defining said reference surface comprises two, identical, wedge-shaped projections integral with said mold and extending into said cavity from diametrally opposite sides thereof, respectively.
Claim 10
Dependent Claim
59 words
Apparatus as defined in claim 5, wherein: said means defining said reference surface comprises a second pair of pins projecting from the bottom of said mold parallel to the first-named pins; and one of said pairs of pins is mounted on one of said members, and the other pair of pins is mounted on the other of said members.
Claim 11
Dependent Claim
54 words
Apparatus as defined in claim 5, wherein: said first member is a disc; said second member is a rotatable ring surrounding said disc; and a resilient plug is removably secured to said disc and projects upwardly therefrom into said cavity coaxially thereof to form a central recess in the block molded in said cavity.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |