US3843301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum sealed molding apparatus
Assignee: Sintokogio Ltd
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Filing: 1973-02-22
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Granted: 1974-10-22
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Expires: 1993-02-22
Abstract
Abstract A vacuum sealed molding process and apparatus in which a covering sheet of synthetic resin is applied on a pattern fixed on a pattern plate at a first station, and this pattern plate is then transferred to a second station at which the pattern is removed after molding.
Inventors
- 👤 I Nagoya
- 👤 M Kasazaki
- 👤 H Terada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:10
CPC Classifications
B; B22; B22C; B22C9/00; B22C9/02; B22C9/03; B29; B29C; B29C51/00; B29C51/10; B29C51/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
214 words
A vacuum sealed molding apparatus comprising a turntable adapted to rotate for transferring a pattern fixed on a pattern plate from a first station to a second station and then from said second station to said first station, said second station being apart from the first station and provided with means for supplying a charge of heat resisting particulate material into a flask which is conveyed to said second station; a frame member disposed at said first station which consists of surrounding side walls forming a open end thereof and a vacuum chamber provided along the side walls having a slot to draw a covering sheet of synthetic resin to said slot by vacuum suction thereby holding the sheet on the surface of said open end in a substantially plane form above the pattern transferred to the first station; means for causing vertical movement of said frame member or the pattern relatively toward each other so as to apply said covering sheet on the surfaces of said pattern and the pattern plate and means disposed at the second station for causing vertical movement of said flask or said pattern relatively so as to set the flask on the pattern covered with the covering sheet and then remove said pattern from the flask after molding.
Claim 2
Dependent Claim
214 words
A vacuum sealed molding apparatus comprising a turntable adapted to rotate for transferring a pattern fixed on a pattern plate from a first station to a second station and then from said second station to said first station, said second station being apart from the first station and provided with means for supplying a charge of heat resisting particulate material into a flask which is conveyed to said second station; a frame member disposed at said first station which consists of surrounding side walls forming a open end thereof and a vacuum chamber provided along the side walls having a slot to draw a covering sheet of synthetic resin to said slot by vacuum suction thereby holding the sheet on the surface of said open end in a substantially plane form above the pattern transferred to the first station; means for causing vertical movement of said frame member or the pattern relatively toward each other so as to apply said covering sheet on the surfaces of said pattern and the pattern plate and means disposed at the second station for causing vertical movement of said flask or said pattern relatively so as to set the flask on the pattern covered with the covering sheet and then remove said pattern from the flask after molding.
Claim 3
Dependent Claim
52 words
A vacuum sealed molding apparatus as claimed in claim 1, wherein means are provided at the first station for heating said covering sheet held on the surface of said open end whereby facilitating plastic deformation of said sheet when applying the sheet on the surfaces of the pattern and the pattern plate.
Claim 4
Dependent Claim
96 words
A vacuum sealed molding apparatus as claimed in claim 1, further comprising covering sheet supplying means for holding a web of said covering sheet thereon in a roll form and supplying the sheet to said frame member and means having a vacuum chamber with a slot to draw a lEading end portion of said sheet by vacuum suction and movable along the surface of said open end so as to pull out said sheet by said portion from said covering sheet supplying means to said frame member whereby said member is adapted to hold the sheet.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |