US3860382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the manufacture of contoured records
Assignee: Decca Ltd
•
Filing: 1973-02-09
•
Granted: 1975-01-14
•
Expires: 1993-02-09
Abstract
Abstract A method of making disc records, particularly video discs from thermoplastic sheet material. In a press a thin flexible matrix is disposed between the sheet, which is backed by a resilient cushion, and a flexible diaphragm which constitutes a wall of a hydraulic pressure chamber.
Inventors
- 👤 Basil Harry Royston Spiller
- 👤 Alan Phillipson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:16
CPC Classifications
B; B29; B29C; B29C35/00; B29C35/02; B29C35/0288; B29C35/0294; B29C33/00; B29C33/02; B29C33/04; B29C43/00; B29C43/02; B29C43/10; B29C43/32; B29C43/58; B29C59/00; B29C59/02; B29D; B29D17/00; B29D17/005; B29D17/007; B30; B30B; B30B15/00; B30B15/06; B30B5/00; B30B5/02; B29C35/04; B29C35/041; B29K; B29K2027/00; B29K2027/06; B29L; B29L2017/00; B29L2017/001; B29L2017/003; B29L2017/005; Y; Y10; Y10S; Y10S425/00; Y10S425/019; Y10S425/044; Y10S425/81
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
A press for pressing contoured records onto the face of a thermoplastic sheet, comprising: a hydraulic pressure chamber; a flexible conductive diaphragm forming one wall of said chamber; means for securing the diaphragm rigidly around its perimeter; a thin flexible conductive matrix fitting over said diaphragm; means for supporting a sheet of thermoplastic materIal against said matrix; means defining a narrow circular space in said pressure chamber behind said diaphragm; means for alternately supplying hot and cold hydraulic fluid; means for distributing said hydraulic fluid under pressure evenly to the periphery of said space; means for providing egress of said fluid from the middle of said space; and, means for intensifying pressure in said fluid.
Claim 2
Dependent Claim
115 words
A press for pressing contoured records onto the face of a thermoplastic sheet, comprising: a hydraulic pressure chamber; a flexible conductive diaphragm forming one wall of said chamber; means for securing the diaphragm rigidly around its perimeter; a thin flexible conductive matrix fitting over said diaphragm; means for supporting a sheet of thermoplastic materIal against said matrix; means defining a narrow circular space in said pressure chamber behind said diaphragm; means for alternately supplying hot and cold hydraulic fluid; means for distributing said hydraulic fluid under pressure evenly to the periphery of said space; means for providing egress of said fluid from the middle of said space; and, means for intensifying pressure in said fluid.
Claim 3
Dependent Claim
50 words
A press as set forth in claim 1, in which said means for alternately supplying hot and cold hydraulic fluid comprises: a first hydraulic circuit including a cooling chamber; a second hydraulic circuit including a heater; and, valve means for selectively diverting fluid from each hydraulic circuit to said chamber.
Claim 4
Dependent Claim
20 words
A press as set forth in claim 1, in which said means for supporting the sheet comprises a resilient cushion.
Claim 5
Dependent Claim
21 words
A press as set forth in claim 3, in which said cushion is provided with a matt surface facing said diaphragm.
Claim 6
Dependent Claim
91 words
A press as set forth in claim 1, in which said means for distributing said hydraulic fluid comprises: means defining a second narrow circular space in said pressure chamber; said second space being coaxial with and spaced apart from said first space; means defining an annular passageway connecting the peripheries of said spaces; means defining a recess at the center of said second space; an inlet conduit coupled to said recess; and, a distributor in said recess for distributing hydraulic fluid from said conduit evenly and radially outwardly from said recess.
Claim 7
Dependent Claim
43 words
A press as set forth in claim 5 in which said distributor comprises: a tube extending, axially of said second space, into said recess; and, a spherical ball captively disposed in said tube, said ball being of slightly smaller diameter than said tube.
Claim 8
Dependent Claim
83 words
In a press for pressing contoured records onto the face of a thin thermoplastic sheet, the combination comprising: a hydraulic pressure chamber; a flexible conductive diaphragm forming one wall of said chamber; means, including said diaphragm, defining a narrow circular space in said chamber behind said diaphragm; means defining an annular inlet passage connected to the periphery of said space; an outlet conduit coupled to the middle of said space; and, means for delivering hydraulic fluid under pressure evenly to said inlet passage.
Claim 9
Dependent Claim
83 words
In a press for pressing contoured records onto the face of a thin thermoplastic sheet, the combination comprising: a hydraulic pressure chamber; a flexible conductive diaphragm forming one wall of said chamber; means, including said diaphragm, defining a narrow circular space in said chamber behind said diaphragm; means defining an annular inlet passage connected to the periphery of said space; an outlet conduit coupled to the middle of said space; and, means for delivering hydraulic fluid under pressure evenly to said inlet passage.
Claim 10
Dependent Claim
74 words
The combination set forth in claim 7 in which the last-named means comprises: means defining a second narrow circular space in said chamber; said second space being coaxial with and spaced apart from the first-mentioned space; means defining a recess at the center of said second space; an inlet conduit coupled to said recess; and, a distributor in said recess for distributing hydraulic fluid from said conduit evenly and radially outwardly from said recess.
References Cited (Backward Citations)
US1582704A
Cited
US2501823A
Cited
US2998622A
Cited
US3113905A
Cited
US3412427A
Cited
US3635622A
Cited
US3663136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |