Patent US4402659A successfully refreshed from Google Patents.
US4402659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold clamping fixture
Assignee: American Optical Corp
•
Filing: 1981-12-30
•
Granted: 1983-09-06
•
Expires: 2001-12-30
Abstract
Abstract A fixture for evenly distributing a predetermined clamping force about annular mating surfaces of a two-piece lens casting mold for avoidance of unwanted cast lens prism and/or edge flash.
Inventors
- 👤 Arnold Greenbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:07
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00038; B29D11/00125; B29D11/00173; B29D11/00182; B29C; B29C33/00; B29C33/20; B29C33/202; B29C43/00; B29C43/02; B29C43/021; B29C43/32; B29C43/36; B29C43/38; B29C2043/3205; B29C2043/3255; B29C43/361; B29L; B29L2011/00; B29L2011/0016; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
155 words
In a fixture for clamping together two halves of a filled lens casting mold having annular mating surfaces, said mold having an upper mold half having a circular cupped surface, the improvement comprising: a base plate having a mold receiving recess; a clamping plate attachable to said base plate; a spring loaded mold engaging plunger depending from said clamping plate, said plunger being substantially aligned with said recess upon application of said clamping plate to said base plate, there being a spherically curved mold engaging surface at the terminus of said plunger for making contact with said circulary cupped surface of said upper mold half of a mold placed in said recess and for clamping said mold under the force of said spring loading, said mold clamping force being applied uniformly about said annular mating surfaces of said mold as a result of the contact of said spherical plunger terminus with said upper mold half.
Claim 2
Dependent Claim
155 words
In a fixture for clamping together two halves of a filled lens casting mold having annular mating surfaces, said mold having an upper mold half having a circular cupped surface, the improvement comprising: a base plate having a mold receiving recess; a clamping plate attachable to said base plate; a spring loaded mold engaging plunger depending from said clamping plate, said plunger being substantially aligned with said recess upon application of said clamping plate to said base plate, there being a spherically curved mold engaging surface at the terminus of said plunger for making contact with said circulary cupped surface of said upper mold half of a mold placed in said recess and for clamping said mold under the force of said spring loading, said mold clamping force being applied uniformly about said annular mating surfaces of said mold as a result of the contact of said spherical plunger terminus with said upper mold half.
Claim 3
Dependent Claim
47 words
The improvement according to claim 1 wherein said base plate and cover plate are respectively provided with a plurality of mold receiving recesses and spring loaded plungers, corresponding pairs of said recesses and plungers becoming axially aligned upon application of said clamping plate to said base plate.
Claim 4
Dependent Claim
50 words
The improvement according to claim 1 wherein said base and clamping plates are one provided with a locating pin and the other provided with a locating opening for receiving said pin whereby said alignment of plunger and mold receiving recesses is accomplished by entering of said pin into said opening.
Claim 5
Dependent Claim
23 words
The improvement according to claim 3 wherein said base and clamping plates are provided with a plurality of said locating pins and holes.
Claim 6
Dependent Claim
17 words
The improvement according to claim 1 wherein said terminus of said plunger is of a hemispherical shape.
Claim 7
Dependent Claim
30 words
The improvement according to claim 1 wherein said spring loading of said plunger urges same away from said clamping plate, there being stop means limiting extent of said plunger movement.
Claim 8
Dependent Claim
50 words
The improvement according to claim 1 wherein attachment of said clamping plate to said base plate is accomplished with screw and clamping knob, said screw being fastened to said base plate for extension through said clamping plate and reception of said knob, the latter being tightened against said clamping plate.
Claim 9
Dependent Claim
42 words
The improvement according to claim 1 including spacers carried by one of said base and clamping plates, said spacers functioning to establish a given distance between said plates in final assembly thereof, said given distance being that across which said plunger extends.
References Cited (Backward Citations)
US1718485A
Cited
US2472022A
Cited
US2795007A
Cited
US3118198A
Cited
US3016569A
Cited
US3221083A
Cited
US3093447A
Cited
US3134572A
Cited
US3380718A
Cited
US3360829A
Cited
US3475521A
Cited
US3479696A
Cited
US3881683A
Cited
US3915609A
Cited
US4347198A
Cited
US4211384A
Cited
US4209289A
Cited
US4284399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |