US3906799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure responsive measuring instruments
Assignee: Consolidated Airborne Systems Inc
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Filing: 1975-01-06
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Granted: 1975-09-23
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Expires: 1995-01-06
Abstract
Abstract Improvements for compensating for the hysteresis effects in a pressure responsive instrument is provided. Within the housing of the instrument there is a bellows the interior of which is adapted to be selectively placed in fluid communication with a source of pressure. A pair of upper and lower capacitor plates are mounted in the housing and the lower capacitor plate is secured to one end of the bellows. The upper capacitor plate is pivotally mounted on the lower capacitor plate. A function generating cam that drives a cam follower which is resiliently secured to the upper capacitor plate is used for changing the relative positions of the upper and lower capacitor plates. Resilient means are provided for adjusting the position of the upper capacitor plate relative to the lower capacitor plate to thereby compensate for the effects of hysteresis.
Inventors
- 👤 Irwin Wallman
- 👤 Erwin S Rodger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:41
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0033; G01L9/0038; G01L9/0082; G01L9/0086; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2101; Y10T74/2107
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
143 words
A pressure responsive instrument comprising: a. a fluid-tight housing; b. an extendable bellows contained within said housing; c. a fitting for selectively placing the interior of said bellows in fluid communication with a source of pressure; d. upper and lower capacitor plates mounted in said housing; e. means for securing said lower capacitor plate to one end of said bellows; f. means for coupling said upper capacitor plate to said lower capacitor plate; g. function generating means for moving the position of said upper capacitor plate relative to said lower capacitor plate; h. first resilient means for adjusting the position of said upper capacitor plate relative to said lower capacitor plate to thereby compensate for the effects of hysteresis; i. second resilient means for coupling said upper capacitor plate to said function generating means; and j. means for driving said function generating means.
Claim 2
Dependent Claim
143 words
A pressure responsive instrument comprising: a. a fluid-tight housing; b. an extendable bellows contained within said housing; c. a fitting for selectively placing the interior of said bellows in fluid communication with a source of pressure; d. upper and lower capacitor plates mounted in said housing; e. means for securing said lower capacitor plate to one end of said bellows; f. means for coupling said upper capacitor plate to said lower capacitor plate; g. function generating means for moving the position of said upper capacitor plate relative to said lower capacitor plate; h. first resilient means for adjusting the position of said upper capacitor plate relative to said lower capacitor plate to thereby compensate for the effects of hysteresis; i. second resilient means for coupling said upper capacitor plate to said function generating means; and j. means for driving said function generating means.
Claim 3
Dependent Claim
34 words
The instrument according to claim 1 wherein said fitting comprises a hollow post secured to said housing and in fluid communication with the interior of said bellows, said post further including a removable cap.
Claim 4
Dependent Claim
39 words
The instrument according to claim 1 wherein said securing means comprises an elongated flexible linkage having one end thereof secured to one end of said bellows, the other end of said linkage being secured to said lower capacitor plate.
Claim 5
Dependent Claim
32 words
The instrument according to claim 3 wherein there is further included means for axially displacing said linkage for providing rough adjustment of relative positions of said upper and said lower capacitor plates.
Claim 6
Dependent Claim
33 words
The instrument according to claim 3 wherein there is further included means for displacing said lower capacitor plate in a plane that is substantially parallel to the plane of said upper capacitor plate.
Claim 7
Dependent Claim
13 words
The instrument according to claim 1 wherein said coupling means comprises jewel bearing.
Claim 8
Dependent Claim
32 words
The instrument according to claim 6 wherein there is further included a U-shaped strap secured to said upper capacitoR plate, said jewel bearing means extending through the legs of said U-shaped strap.
Claim 9
Dependent Claim
63 words
The instrument according to claim 1 wherein said function generating means is a cup-shaped cam having a peripheral, magnetic cam surface, said second resilient means being an elongated strip having one end thereof secured to said upper capacitor plate, the other end of said strip including a cam follower in the form of a magnet that is arranged to traverse said cam surface.
Claim 10
Dependent Claim
19 words
The instrument according to claim 8 further including means for adjusting said cam follower relative to said cam surface.
Claim 11
Dependent Claim
43 words
The instrument according to claim 1 wherein said first resilient means is a U-shaped spring having one leg thereof in engagement with said upper capacitor plate, the other leg of said U-shaped spring being in engagement with a fixed portion of said housing.
Claim 12
Dependent Claim
23 words
The instrument according to claim 10 further including means for adjusting the position of at least one said leg of said U-shaped spring.
Claim 13
Dependent Claim
21 words
The instrument according to claim 10 further including means for adjusting the position of both said legs of said U-shaped spring.
Claim 14
Dependent Claim
41 words
The instrument according to claim 1 including a third resilient means mounting said upper plate to a fixed frame which allows said upper plate to rotate in response to said function generating means and translate in response to first resilient means.
Claim 15
Dependent Claim
27 words
The instrument according to claim 1 including a third resilient means as in claim 13 which has essentially the same thermo-elastic coefficient as said first resilient means.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |