Patent US3552433A successfully refreshed from Google Patents.
US3552433A
Expired / Lapsed
US
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Concentric spool valve
Assignee: Bell Aerospace Corp
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Filing: 1969-06-13
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Granted: 1971-01-05
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Expires: 1989-06-13
Abstract
Abstract A device which compares the position of concentric spools which normally move in unison. Any disagreement in the relative position of the spool positions above a predetermined amount uncovers a flow port which results in a hydraeric signal being generated to indicate the disagreement.
Inventors
- 👤 Richard K Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:39
CPC Classifications
F; F15; F15B; F15B20/00; F15B20/008; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409; Y10T137/8158; Y10T137/8225; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/8659; Y10T137/86598; Y10T137/8667; Y10T137/86694; Y10T137/8671; Y10T137/87169
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
92 words
In A hydraeric control system for applying hydraeric fluid from a source thereof to a load through ports controlled by a control valve spool, and including a mechanism for effecting a desired system change upon failure, the improvement wherein a bore is defined by said control valve spool and said mechanism comprises: a monitor spool slideably disposed in said bore; independent means for positioning said monitor spool; means for moving monitor spool and control spool in substantial unity; and means for detecting relative movement between said control spool and said monitor spool.
Claim 2
Dependent Claim
92 words
In A hydraeric control system for applying hydraeric fluid from a source thereof to a load through ports controlled by a control valve spool, and including a mechanism for effecting a desired system change upon failure, the improvement wherein a bore is defined by said control valve spool and said mechanism comprises: a monitor spool slideably disposed in said bore; independent means for positioning said monitor spool; means for moving monitor spool and control spool in substantial unity; and means for detecting relative movement between said control spool and said monitor spool.
Claim 3
Dependent Claim
39 words
The improvement of claim 1 including means for applying a hydraeric pressure differential across said control valve spool and means for applying a hydraeric pressure differential across said monitor spool in proportion to said control valve spool hydraeric differential.
Claim 4
Dependent Claim
45 words
The improvement of claim 1 including a hydraeric path through said control valve spool, said monitor spool and control valve spool being formed so that said relative movement causes a change in hydraeric pressure in said path to thereby effect a change in said system.
Claim 5
Dependent Claim
46 words
The improvement of claim 1 including a hydraeric path through said control valve spool and a system return, said monitor spool and control valve spool being formed so that said relative movement vents said path to said return to thereby effect a change in said system.
Claim 6
Dependent Claim
59 words
The improvement of claim 1 including a hydraeric path into said control valve spool bore and a system return in communication with said control valve spool bore, said monitor spool and control valve spool being formed so that said relative movement effects the venting of said hydraeric path to said return to thereby effect a change in said system.
Claim 7
Dependent Claim
36 words
The improvement of claim 5 including a shutoff valve for said system in communication with said hydraeric path and operative upon venting of said hydraeric path to shut off said load from said hydraeric fluid source.
Claim 8
Dependent Claim
31 words
The improvement of claim 5 including means responsive to a hydraeric pressure drop for signaling failure of said system, said pressure responsive means being in operative communication with said hydraeric path.
Claim 9
Dependent Claim
80 words
The improvement of claim 2 including a hydraeric path and a system return path to each end of said monitor spool, said monitor spool and control valve spool being formed so that upon said relative movement communication is effected between that end of said monitor spool in the direction of its relative movement and said system return path and between the other end of said monitor spool and said hydraeric path to thereby latch said system in an overtravel position.
Claim 10
Dependent Claim
53 words
The improvement of claim 2 including first and second means responsive to electrical signals for controlling the hydraeric pressure differentials to said monitor spool and control valve spool, respectively, wherein substantially identical linear movements of said monitor and control spools are normally effected by identical electrical signals to said first and second means.
Claim 11
Dependent Claim
35 words
The improvement of claim 9 including means responsive to said relative movement to effect the application of opposite electrical signals to said first and second means to thereby latch said system in an overtravel position.
Claim 12
Dependent Claim
79 words
The improvement of claim 2 including a land on said monitor spool within said control spool bore and a bore defined through said land in communication with said control valve spool bore whereby hydraeric pressure on both sides of said land are equalized, said monitor spool and control valve spool being formed so that said land bore effects a change in hydraeric pressure within said control valve spool bore upon said relative movement of said monitor and control spools.
Claim 13
Dependent Claim
56 words
A redundant control system comprising a plurality of control channels, each control channel including a control member and a monitor member, means for effecting substantially identical movements of said control and monitor members And means responsive to a differential in said movements to disable that channel independently of the others of said plurality of control channels.
Claim 14
Dependent Claim
56 words
A redundant control system comprising a plurality of control channels, each control channel including a control member and a monitor member, means for effecting substantially identical movements of said control and monitor members And means responsive to a differential in said movements to disable that channel independently of the others of said plurality of control channels.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |