Patent US3813119A successfully refreshed from Google Patents.
US3813119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection system for box car doors
Assignee: Individual
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Filing: 1973-02-22
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Granted: 1974-05-28
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Expires: 1993-02-22
Abstract
Abstract A latch system for box car doors comprising a pneumatic cylinder with suitable linkage to two metal arms with hooks formed at end. When air pressure is applied to cylinder, hooks unlatch. As air pressure is released, spring returns cylinder piston to original position, thereby latching doors closed.
Inventors
- 👤 J Panici
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:48
CPC Classifications
E; E05; E05B; E05B83/00; E05B83/02; E05B65/00; E05B65/08; E05B65/0811; E05B81/00; E05B81/02; E05B81/10; E05B83/04; E05B83/06; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/0801; Y10T292/081; Y10T292/0825; Y10T292/0826; Y10T292/0911; Y10T292/0926; Y10T292/0928; Y10T292/1043; Y10T292/1075; Y10T292/1082
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
66 words
A protection system for box car doors, using an independent air source, comprising a pneumatic cylinder, a hollow shaft extension threaded onto the cylinder shaft and to which a connector is integrally affixed, said connector being also a spring retainer on cylinder side; said hollow shaft accepting a rod whereon a compression spring is positioned and mounting hardware attached therefrom at other end of said rod.
Claim 2
Dependent Claim
66 words
A protection system for box car doors, using an independent air source, comprising a pneumatic cylinder, a hollow shaft extension threaded onto the cylinder shaft and to which a connector is integrally affixed, said connector being also a spring retainer on cylinder side; said hollow shaft accepting a rod whereon a compression spring is positioned and mounting hardware attached therefrom at other end of said rod.
Claim 3
Dependent Claim
63 words
A protection system for box car doors as in claim 1 wherein said connector having extension, said extension pivotally attached to one end of link, other end of link pivotally attached to locking arm, said arm also having pivot, said pivot integrally affixed to box car wall, said arm terminating in hook, said hook locking on pin integrally affixed to box car door.
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |