US3829011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic control system for a fuel burning apparatus or the like
Assignee: ROBERTSON CONTROLS CO
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Filing: 1973-05-21
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Granted: 1974-08-13
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Expires: 1993-05-21
Abstract
Abstract This disclosure relates to a pneumatic control system for a clothes dryer wherein the flow of fuel to the main burner means is pneumatically controlled in such a manner that the ignition means for the main burner means must be first pneumatically actuated before the pneumatic control system will pneumatically open the fuel supply means to the main burner means, the control system including a pneumatically operated logic ''''memory'''' unit to assure that the ignition means is always pneumatically operated before the main burner means can be pneumatically operated to its on condition by a pneumatically operated ''''nand'''' unit each time there is a requirement to turn on the main burner means. The ''''memory'''' unit is prevented from transmitting atmosphere therethrough when being switched by its setting signal.
Inventors
- 👤 D Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:38
CPC Classifications
F; F23; F23N; F23N1/00; G; G05; G05B; G05B11/00; G05B11/44; G05B11/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
237 words
A pneumatically operated control system comprising a pneumatic source, a pneumatically operated unit having a housing means carrying a movable means that cooperates therewith define at least first, second and third chambers in stacked relation, said housing means having first and second valve seats leading respectively to said first chamber and to said third chamber and being adapted to be opened and closed by said movable means, first means comprising a thermostatically operated device for interconnecting said source to said second chamber to move said movable means to close said first valve seat and open said second valve seat and for interconnecting the atmosphere to said second chamber to cause said movable means to move to close said second valve seat and open said first valve seat, second means for interconnecting said source to said second valve seat, said movable means having passage means therethrough always interconnecting said first and third chambers together, said first means also interconnecting the atmosphere to said first valve seat at substantially the same time it interconnects the atmosphere to said second chamber and having disconnecting means to disconnect the atmosphere from said first valve seat when said first means is interconnecting said source to said second chamber whereby said first chamber is disconnected from the atmosphere during the time it takes said second chamber to switch said movable means for closing said second valve seat to opening said second valve seat.
Claim 2
Dependent Claim
237 words
A pneumatically operated control system comprising a pneumatic source, a pneumatically operated unit having a housing means carrying a movable means that cooperates therewith define at least first, second and third chambers in stacked relation, said housing means having first and second valve seats leading respectively to said first chamber and to said third chamber and being adapted to be opened and closed by said movable means, first means comprising a thermostatically operated device for interconnecting said source to said second chamber to move said movable means to close said first valve seat and open said second valve seat and for interconnecting the atmosphere to said second chamber to cause said movable means to move to close said second valve seat and open said first valve seat, second means for interconnecting said source to said second valve seat, said movable means having passage means therethrough always interconnecting said first and third chambers together, said first means also interconnecting the atmosphere to said first valve seat at substantially the same time it interconnects the atmosphere to said second chamber and having disconnecting means to disconnect the atmosphere from said first valve seat when said first means is interconnecting said source to said second chamber whereby said first chamber is disconnected from the atmosphere during the time it takes said second chamber to switch said movable means for closing said second valve seat to opening said second valve seat.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |