Patent US3602536A successfully refreshed from Google Patents.
US3602536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airlock construction
Assignee: MILL AND MINE SERVICES Inc A CORP OF
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Filing: 1970-07-17
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Granted: 1971-08-31
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Expires: 1990-07-17
Abstract
Abstract An airlock housing having opposed doors with a normally closed locking device cooperable with one door, the locking device being operable to open position through an actuating arm cooperable with the opposite door when the opposite door is moved to closed position.
Inventors
- 👤 Edward R Gamble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:50
CPC Classifications
E; E05; E05C; E05C7/00; E05C7/002; Y; Y10; Y10S; Y10S292/00; Y10S292/65; Y10T; Y10T292/00; Y10T292/08; Y10T292/0911; Y10T292/0926; Y10T292/0928; Y10T292/0933; Y10T70/00; Y10T70/80; Y10T70/8027
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
An improved airlock construction comprising: an airlock housing having opposed door openings at opposite extremities of said housing; opposed doors pivotally mounted on said housing in cooperative relation with said door openings; door latch strike means fixed to one of said doors; door latch means pivotally mounted to engage said strike means to lock said one door when said one door is in closed position; actuating rod means connected at one end to said door latch means; spring means cooperating with said actuating rod means to urge said actuating rod means in a first direction to pivot said door latch means into locked position with said strike means; said actuating rod means being sized to extend through said opposite door opening when said door latch means is in locked position with said door strike means to be engaged by said opposite door when said opposite door is moved to closed position to urge said actuating rod means in an opposite direction against said spring means to pivot said door latch means into unlocked position with said door strike means.
Claim 2
Dependent Claim
179 words
An improved airlock construction comprising: an airlock housing having opposed door openings at opposite extremities of said housing; opposed doors pivotally mounted on said housing in cooperative relation with said door openings; door latch strike means fixed to one of said doors; door latch means pivotally mounted to engage said strike means to lock said one door when said one door is in closed position; actuating rod means connected at one end to said door latch means; spring means cooperating with said actuating rod means to urge said actuating rod means in a first direction to pivot said door latch means into locked position with said strike means; said actuating rod means being sized to extend through said opposite door opening when said door latch means is in locked position with said door strike means to be engaged by said opposite door when said opposite door is moved to closed position to urge said actuating rod means in an opposite direction against said spring means to pivot said door latch means into unlocked position with said door strike means.
Claim 3
Dependent Claim
43 words
The apparatus of claim 1, said door latch means being pivotally mounted to said housing and guide means for said actuating rod means, said guide means being mounted to said housing to guide said rod means in lineal movement along its longitudinal axis.
Claim 4
Dependent Claim
28 words
The apparatus of claim 2, said spring means being in the form of a helical coil disposed within said guide means to cooperate with said actuating rod means.
Claim 5
Dependent Claim
78 words
The apparatus of claim 2, said guide means including an open end tubular member fixed to said housing with its longitudinal axis aligned with the longitudinal axis of said actuating rod member to slidably receive an extremity thereof; one of said doors having an aperture therein in communication with said tubular member; said actuating rod means being sized to extend through said aperture when said opposite door has been moved to closed position to so indicate this fact.
Claim 6
Dependent Claim
72 words
The apparatus of claim 2, said guide means being in the form of a U-shaped saddle with its base leg fixed to said housing and having opposed apertures in opposed side legs through which said actuating rod means extends; said spring means being in the form of a helical coil disposed between said opposed side legs; said actuating rod means having a stop extending therefrom to be engaged by said helical coil.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |