US3570516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latching comparator
Assignee: Bell Aerospace Corp
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Filing: 1969-03-07
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Granted: 1971-03-16
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Expires: 1989-03-07
Abstract
Abstract Disclosed is a differential pressure responsive device for comparing pressures applied thereto and upon a predetermined differential between the pressures causing movement of the device through a predetermined distance, force is applied to latch the comparator in its limit position in the direction of movement. The force applied may, for example, by a source of hydraeric pressure. The term ''''hydraeric'''' as used throughout this specification and the appended claims defined as being generic to hydraulic and pneumatic and as synonymous in the broad sense with fluid under pressure.
Inventors
- 👤 Richard K Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:02
CPC Classifications
F; F15; F15B; F15B5/00; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2703; Y10T137/2705; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86622; Y10T137/8663; Y10T137/86879
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
214 words
Latching comparator means for detecting disparity between fluid pressure signals and locking in a disparity-indicating position comprising: 1. pressure-responsive means having first and second areas and disposed to move in first and second directions to limits upon the application of unequal fluid pressure signals to said areas; 2. first and second passageway means connected to apply first and second fluid pressure signals to be compared to said first and second areas respectively, said pressure responsive means moving in said first direction when said first fluid pressure signal exceeds said second fluid pressure signal and in said second direction when said second fluid pressure signal exceeds said first fluid pressure signal; 3. third and fourth passageway means connecting a source of fluid pressure and return respectively to said pressureresponsive means and adapted to override said first and second fluid pressure signals after said pressure-responsive means has moved a predetermined distance in either of said first and second directions, said source of fluid pressure moving said pressure-responsive means to said limit position and retaining said pressure-responsive means thereat irrespective of changes in said first and second fluid pressure signals; and 4. signal-generating means coupled to said pressure-responsive means for providing a signal indicative of movement of said pressure-responsive means in said first or said second direction.
Claim 2
Dependent Claim
214 words
Latching comparator means for detecting disparity between fluid pressure signals and locking in a disparity-indicating position comprising: 1. pressure-responsive means having first and second areas and disposed to move in first and second directions to limits upon the application of unequal fluid pressure signals to said areas; 2. first and second passageway means connected to apply first and second fluid pressure signals to be compared to said first and second areas respectively, said pressure responsive means moving in said first direction when said first fluid pressure signal exceeds said second fluid pressure signal and in said second direction when said second fluid pressure signal exceeds said first fluid pressure signal; 3. third and fourth passageway means connecting a source of fluid pressure and return respectively to said pressureresponsive means and adapted to override said first and second fluid pressure signals after said pressure-responsive means has moved a predetermined distance in either of said first and second directions, said source of fluid pressure moving said pressure-responsive means to said limit position and retaining said pressure-responsive means thereat irrespective of changes in said first and second fluid pressure signals; and 4. signal-generating means coupled to said pressure-responsive means for providing a signal indicative of movement of said pressure-responsive means in said first or said second direction.
Claim 3
Dependent Claim
37 words
Latching comparator means as defined in claim 1 which further includes movement-restraining means disposed to preclude movement of said pressure-responsive means to its limit position until a predetermined differential exists between said first and second pressure signalS.
Claim 4
Dependent Claim
62 words
first and second passageway means connected to apply first and second fluid pressure signals to be compared to said first and second areas respectively, said pressure responsive means moving in said first direction when said first fluid pressure signal exceeds said second fluid pressure signal and in said second direction when said second fluid pressure signal exceeds said first fluid pressure signal;
Claim 5
Dependent Claim
62 words
first and second passageway means connected to apply first and second fluid pressure signals to be compared to said first and second areas respectively, said pressure responsive means moving in said first direction when said first fluid pressure signal exceeds said second fluid pressure signal and in said second direction when said second fluid pressure signal exceeds said first fluid pressure signal;
Claim 6
Dependent Claim
77 words
third and fourth passageway means connecting a source of fluid pressure and return respectively to said pressure-responsive means and adapted to override said first and second fluid pressure signals after said pressure-responsive means has moved a predetermined distance in either of said first and second directions, said source of fluid pressure moving said pressure-responsive means to said limit position and retaining said pressure-responsive means thereat irrespective of changes in said first and second fluid pressure signals; and
Claim 7
Dependent Claim
77 words
third and fourth passageway means connecting a source of fluid pressure and return respectively to said pressure-responsive means and adapted to override said first and second fluid pressure signals after said pressure-responsive means has moved a predetermined distance in either of said first and second directions, said source of fluid pressure moving said pressure-responsive means to said limit position and retaining said pressure-responsive means thereat irrespective of changes in said first and second fluid pressure signals; and
Claim 8
Dependent Claim
91 words
Latching comparator means as defined in claim 1 wherein said pressure-responsive means is a spool slidably received in a bore defining, with said end areas, first and second chambers, said first and second passageway means being connected to said bore at first and second port means respectively, said third and fourth passageway means being connected to said bore at third and fourth port means respectively, said spool providing communication between said third and fourth passageway means and said first and second areas respectively only when said spool moves a predetermined distance.
Claim 9
Dependent Claim
102 words
Latching comparator means as defined in claim 3 wherein said spool defines first and second reduced diameter portions and an opening providing communication between said first and second chambers and said first and second reduced diameter portions respectively, said spool maintaining communication between said first and second compared signals and said first and second chambers respectively when said compared signals are substantially equal, and said spool providing communication bet between said of pressure and said first chamber when said spool moves in said first direction and said source of pressure and said second chamber when said spool moves in said second direction.
Claim 10
Dependent Claim
25 words
signal-generating means coupled to said pressure-responsive means for providing a signal indicative of movement of said pressure-responsive means in said first or said second direction.
Claim 11
Dependent Claim
25 words
signal-generating means coupled to said pressure-responsive means for providing a signal indicative of movement of said pressure-responsive means in said first or said second direction.
Claim 12
Dependent Claim
55 words
Latching comparator means as defined in claim 4 which further includes reset valve means, said third and fourth passageways being connected through said reset valve means thereby to connect said source of pressure to said fourth passageway and said return to said third passageway to selectively reset said comparator upon operation of said reset valve.
Claim 13
Dependent Claim
40 words
Latching comparator means as defined in claim 4 wherein said third and fourth port means is positioned with respect to said spool to minimize simultaneous communication between said first and second compared signals and said source of pressure or return.
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |