US3860407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for mold cooling in glass forming machine
Assignee: Leeds and Northrup Co
•
Filing: 1973-06-18
•
Granted: 1975-01-14
•
Expires: 1993-06-18
Abstract
Abstract There is disclosed a system for controlling the cooling of the molds in a glass forming machine which involves compensating the pressure set point for the control of the cooling air to correct for changes in the temperature of the cooling air and changes in the mass flow rate of the glass.
Inventors
- 👤 Harry A Fertik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:10
CPC Classifications
C; C03; C03B; C03B9/00; C03B9/30; C03B9/38; C03B9/3816; G; G05; G05D; G05D16/00; G05D16/20; G05D16/2006; G05D16/2013; G05D16/202
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
156 words
A control system for maintaining a constant temperature for the parisons formed in a glass forming machine where the parisons are subject to air cooling by the blowing of cooling air from a duct onto the mold for the parisons, comprising: means for changing the pressure of the cooling air in the duct, means for measuring the pressure of the cooling air in said duct, control means operable in response to the deviation of said pressure measurement from a set point value to control said pressure by controlling the operation of said first named means, means for measuring the temperature of said cooling air, and means responsive to changes in said temperature measurement for directly varying the deviation to which said control means is responsive so as to cause said control means to vary the pressure in said duct to maintain a substantially constant temperature for said parisons as said temperature of said cooling air changes.
Claim 2
Dependent Claim
156 words
A control system for maintaining a constant temperature for the parisons formed in a glass forming machine where the parisons are subject to air cooling by the blowing of cooling air from a duct onto the mold for the parisons, comprising: means for changing the pressure of the cooling air in the duct, means for measuring the pressure of the cooling air in said duct, control means operable in response to the deviation of said pressure measurement from a set point value to control said pressure by controlling the operation of said first named means, means for measuring the temperature of said cooling air, and means responsive to changes in said temperature measurement for directly varying the deviation to which said control means is responsive so as to cause said control means to vary the pressure in said duct to maintain a substantially constant temperature for said parisons as said temperature of said cooling air changes.
Claim 3
Dependent Claim
77 words
A control system as set forth in claim 1 which includes means responsive to the deviation of the mass flow rate of glass in the form of parisons from the nominal valuae for said rate for compensating said control means so that said control means will anticipate the change in heat transfer equilibrium resulting from said change in mass flow rate so as to maintain a constant temperature for said parisons as said mass flow rate changes.
References Cited (Backward Citations)
US3416908A
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 |