US3786828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compressor unloader and check valve unit
Assignee: Individual
•
Filing: 1972-08-28
•
Granted: 1974-01-22
•
Expires: 1992-08-28
Abstract
Abstract An improved compressor unloader and check valve unit normally operable automatically to unload a compressor when the pressure downstream from the compressor exceeds a predetermined value and having means for locking it in either its loaded or unloaded mode of operation.
Inventors
- 👤 J Krechel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:33
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/02; F04B49/022; F04B49/22; F04B49/24; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2622; Y10T137/2625
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
165 words
In an unloader valve for a compressor having an inlet port for connection of a line from the compressor, an outlet port, an exhaust port, valve means responsive to pressure at the outlet port and acting upon increase in said pressure above a predetermined value to open up communication between the inlet and the exhaust ports, said valve means acting to block communication between the inlet and exhaust ports when said pressure is below said predetermined value, said valve means including a member movable between a first position in which the valve means is in a first mode blocking communication between the inlet and exhaust ports, and a second position in which the valve means is in a second mode opening up communication between the inlet and exhaust ports for unloading the compressor, said member having means for manually moving it from its first to its second position, and means for alternatively locKing said member only in either its first or in its second position.
Claim 2
Dependent Claim
165 words
In an unloader valve for a compressor having an inlet port for connection of a line from the compressor, an outlet port, an exhaust port, valve means responsive to pressure at the outlet port and acting upon increase in said pressure above a predetermined value to open up communication between the inlet and the exhaust ports, said valve means acting to block communication between the inlet and exhaust ports when said pressure is below said predetermined value, said valve means including a member movable between a first position in which the valve means is in a first mode blocking communication between the inlet and exhaust ports, and a second position in which the valve means is in a second mode opening up communication between the inlet and exhaust ports for unloading the compressor, said member having means for manually moving it from its first to its second position, and means for alternatively locKing said member only in either its first or in its second position.
Claim 3
Dependent Claim
61 words
In an unloader valve as set forth in claim 1, said locking means being carried by said unloader valve for movement between a retracted position clear of said member into engagement with said member alternatively either to hold said member against movement away from its first position or to hold said member against movement from its second to its first position.
Claim 4
Dependent Claim
30 words
In an unloader valve as set forth in claim 2, said means for manually moving said member comprising a finger grip, and said locking means being engageable with said grip.
Claim 5
Dependent Claim
47 words
In an unloader valve as set forth in claim 3, said member comprising a rod extending out of the unloader valve axially movable between its said first and second positions and biased toward its first position, said finger grip being adjacent the outer end of said rod.
Claim 6
Dependent Claim
62 words
In an unloader valve as set forth in claim 4, said rod being biased inwardly toward its said first position, said locking means being alternately engageable over said finger grip to hold the rod in its first position, or under the finger grip after the rod has been pulled out to its second position to hold the rod in its second position.
Claim 7
Dependent Claim
51 words
In an unloader valve as set forth in claim 5, said locking means comprising a bail formed of wire pivotally mounted on the unloader valve for swinging movement from a retracted position clear of the rod into position wherein a portion of the bail is either over or under said grip.
Claim 8
Dependent Claim
33 words
In an unloader valve as set forth in claim 6, said portion of the bail being in the form of a loop adapted to straddle the rod either over or under said grip.
Claim 9
Dependent Claim
30 words
In an unloader valve as set forth in claim 7, said loop having a high step for engagement under said grip and a low step for engagement over said grip.
References Cited (Backward Citations)
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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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |