US3693706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic control system
Assignee: Robertshaw Controls Co
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Filing: 1970-07-01
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Granted: 1972-09-26
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Expires: 1990-07-01
Abstract
Abstract This disclosure relates to a vacuum temperature control system wherein a pair of vacuum signals respectively from a temperature sensor and a temperature selecting means are translated by a comparator into a vacuum control signal that operates a temperature output means for the system in relation to the vacuum control signal to produce a proportional action thereof, the system, however, having vacuum signal means for resetting the comparator to slowly eliminate the proportional action caused by the comparator.
Inventors
- 👤 Larry V Nisley
- 👤 Klaus P Mueller
- 👤 Kenneth G Kreuter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:29
CPC Classifications
B; B60; B60H; B60H1/00; B60H1/00642; B60H1/00735
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
179 words
A pneumatic control system for a transportation vehicle subjected to shocks and vibrations, said system comprising a pneumatic source, a pneumatically operated control device, a comparator having means for interconnecting a pneumatic control signal from said source to said device proportionally to the degree of actuation of said comparator caused by the differential between two pneumatic signals imposed thereon whereby said control device is actuated proportionally to said control signal received thereby, a condition sensor interconnected to said source to direct one of said signals from said source to said comparator in relation to the condition sensed thereby, a selector means interconnected to said source to direct the other of said signals to said comparator in relation to the setting thereof, automatic means for repetitively resetting said comparator to automatically change the control signal being directed therefrom to said control device until said two pneumatic signals imposed on said comparator are equal so as to substantially cancel said proportional actuation of said control device, and a heat exchanging means operative interconnected to said control device to be controlled thereby.
Claim 2
Dependent Claim
179 words
A pneumatic control system for a transportation vehicle subjected to shocks and vibrations, said system comprising a pneumatic source, a pneumatically operated control device, a comparator having means for interconnecting a pneumatic control signal from said source to said device proportionally to the degree of actuation of said comparator caused by the differential between two pneumatic signals imposed thereon whereby said control device is actuated proportionally to said control signal received thereby, a condition sensor interconnected to said source to direct one of said signals from said source to said comparator in relation to the condition sensed thereby, a selector means interconnected to said source to direct the other of said signals to said comparator in relation to the setting thereof, automatic means for repetitively resetting said comparator to automatically change the control signal being directed therefrom to said control device until said two pneumatic signals imposed on said comparator are equal so as to substantially cancel said proportional actuation of said control device, and a heat exchanging means operative interconnected to said control device to be controlled thereby.
Claim 3
Dependent Claim
23 words
A pneumatic control system as set forth in claim 1 wherein said heat exchanging means comprises a cooling means and a heating means.
Claim 4
Dependent Claim
58 words
A pneumatic control system as set forth in claim 2 wherein said control device has a proportional band of actuation thereof from one condition of actuation thereof to another condition of actuation thereof, said one condition of actuation causing full operation of said cooling means and said other condition of actuation causing full operation of said heating means.
References Cited (Backward Citations)
US3315730A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |