US3663829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensitive control apparatus
Assignee: Magnavac Air Systems Ltd
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Filing: 1970-09-14
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Granted: 1972-05-16
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Expires: 1990-09-14
Abstract
Abstract The control apparatus of this invention is for controlling the operation of a mechanism in response to repeated long-term changes in fluid pressure; e.g., a fiber-conveying air stream, wherein the fluid also is subject to short-term pressure changes such as are attendant to turbulence of an air stream, for example. The apparatus comprises a flexible diaphragm movable in response to both repeated long-term and repeated short-term pressure changes and also includes time delay means connecting a movable means, which is movable between first and second positions by the diaphragm, to the mechanism for effecting a desired response in the mechanism at such times that the movable means occupies a selected one of the first and second positions for a predetermined long-term period of time established by the time delay means and thereby avoiding rapidly repeated intermittent responses of the mechanism as a result of the shortterm pressure changes acting on the diaphragm.
Inventors
- 👤 Arnold Broadbent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:52
CPC Classifications
H; H01; H01H; H01H35/00; H01H35/24; H01H35/34; H01H35/26; H01H35/2685; H01H35/2607; H01H35/2614
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
171 words
A pressure sensitive control apparatus comprising a flexible diaphragm movable in response to both long-term and short-term changes in fluid pressure thereagainst, a first movable means adjacent said diaphragm and movable in opposite directions by and with movement of said diaphragm, time delay means operatively connected to said first movable means and activated in response to each movement of said first movable means from a first position to a second position, a second movable means operatively connected to said time delay means, a mEchanism operatively connected to and responsive to movement of said second movable means from one position to another position, and said time delay means including means to move said second movable means from said one position to said other position upon expiration only of a predetermined period of time following each time that said first movable means is moved to said second position whereby a delayed response of said mechanism is effected only upon said first movable means occupying said second position for said predetermined period of time.
Claim 2
Dependent Claim
171 words
A pressure sensitive control apparatus comprising a flexible diaphragm movable in response to both long-term and short-term changes in fluid pressure thereagainst, a first movable means adjacent said diaphragm and movable in opposite directions by and with movement of said diaphragm, time delay means operatively connected to said first movable means and activated in response to each movement of said first movable means from a first position to a second position, a second movable means operatively connected to said time delay means, a mEchanism operatively connected to and responsive to movement of said second movable means from one position to another position, and said time delay means including means to move said second movable means from said one position to said other position upon expiration only of a predetermined period of time following each time that said first movable means is moved to said second position whereby a delayed response of said mechanism is effected only upon said first movable means occupying said second position for said predetermined period of time.
Claim 3
Dependent Claim
70 words
A pressure sensitive control apparatus according to claim 1, wherein said time delay means and said mechanism are electrically operable, said first movable means comprises switch means electrically connected to said time delay means when said first movable means occupies said second position, and said second movable means comprises an electromagnetically operated switch element electrically connected to said mechanism when said second movable means occupies one only of its positions.
Claim 4
Dependent Claim
194 words
A pressure sensitive control apparatus according to claim 1, wherein said mechanism is electrically operable, an electromagnetic relay including a coil, said first movable means comprising switch means, said time delay means comprising a diode and a resistor in series with and interposed in an electrical circuit between said switch means and said coil, and a capacitor in parallel with said coil but in series with said diode and said resistor, said second movable means comprising a switch element normally occupying a first position and movable to a second position in response to said coil being energized, said switch means being adapted to be moved from an open position to a closed position upon each said movement of said first movable means from said first position to said second position to cause current to flow through said diode, said resistor and said capacitor, said diode and resistor preventing said capacitor from reaching a full charge until after said switch means has occupied said closed position for a predetermined period of time whereby, upon expiration of said predetermined period of time, said coil is energized and moves said switch element to its said second position.
Claim 5
Dependent Claim
162 words
A pressure sensitive control apparatus comprising a flexible diaphragm movable in response to both long-term and short-term changes in fluid pressure thereagainst, a first normally inactive switch means adjacent said diaphragm and movable repeatedly to active position by and with said diaphragm, time delay means interposed in an electrical circuit with said first switch means and activated in response to each movement of said first switch means to active position, a second switch means operatively connected to said time delay means, an electrically operable mechanism responsive to movement of said second switch means from one position to another position, and said time delay means including means to move said second switch means from said one position to said other position upon expiration only of a predetermined period of time following each activation of said first switch means whereby a delayed response of said mechanism is effected only upon said first switch means occupying said active position for said predetermined period of time.
Claim 6
Dependent Claim
162 words
A pressure sensitive control apparatus comprising a flexible diaphragm movable in response to both long-term and short-term changes in fluid pressure thereagainst, a first normally inactive switch means adjacent said diaphragm and movable repeatedly to active position by and with said diaphragm, time delay means interposed in an electrical circuit with said first switch means and activated in response to each movement of said first switch means to active position, a second switch means operatively connected to said time delay means, an electrically operable mechanism responsive to movement of said second switch means from one position to another position, and said time delay means including means to move said second switch means from said one position to said other position upon expiration only of a predetermined period of time following each activation of said first switch means whereby a delayed response of said mechanism is effected only upon said first switch means occupying said active position for said predetermined period of time.
References Cited (Backward Citations)
US3498091A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |