Patent US2435572A successfully refreshed from Google Patents.
US3284840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptor lever arm electro-magnetic door closer
Assignee: PHILLIP N HEIL
•
Filing: 1964-02-24
•
Granted: 1966-11-15
•
Expires: 1984-02-24
Abstract
No abstract record available.
Inventors
- 👤 Ambrose C Ulman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:17
CPC Classifications
A; A62; A62C; A62C2/00; A62C2/06; A62C2/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
IMPROVEMENTS IN A SPRING OPERATED DOOR CLOSER, COMPRISING: A SPRING OPERATED SHAFT; AN ARM FIXEDLY SECURED AT ONE END THEREOF TO SAID SHAFT AND HAVING AT THE OTHER END THEREOF AN ANTI-FRICTION ELEMENT FOR PUSHING ENGAGEMENT ONLY WITH ONE FACE OF A DOOR; AN ARMATURE SECURED TO SAID ARM; AN ELECTROMAGNET SECURABLE TO FIXED WALL STRUCTURE FOR ENGAGEMENTS WITH SAID ARMATURE WHEN SAID ARM IS IN DOOR-OPEN POSITION; AND AN ELECTRIC CIRCUIT NORMALLY ENERGIZING SAID ELECTROMAGNET AND INCLUDING HEAT SENSITIVE CIRCUIT OPENING MEANS CONNECTED SO THAT UNDUE RISE OF TEMPERATURE WILL DE-ENERGIZE SAID ELECTROMAGNET RELEASING SAID ARMATURE AND PERMITTING SAID ARM TO MOVE TO A DOORCLOSED POSITION, WHEREBY THE DOOR IS POSITIVELY CLOSED IN THE EVENT OF FIRE AND AT ALL OTHER TIMES THE DOOR IS FREE TO BE MOVED TO ANY DESIRED POSITION.
Claim 2
Dependent Claim
134 words
IMPROVEMENTS IN A SPRING OPERATED DOOR CLOSER, COMPRISING: A SPRING OPERATED SHAFT; AN ARM FIXEDLY SECURED AT ONE END THEREOF TO SAID SHAFT AND HAVING AT THE OTHER END THEREOF AN ANTI-FRICTION ELEMENT FOR PUSHING ENGAGEMENT ONLY WITH ONE FACE OF A DOOR; AN ARMATURE SECURED TO SAID ARM; AN ELECTROMAGNET SECURABLE TO FIXED WALL STRUCTURE FOR ENGAGEMENTS WITH SAID ARMATURE WHEN SAID ARM IS IN DOOR-OPEN POSITION; AND AN ELECTRIC CIRCUIT NORMALLY ENERGIZING SAID ELECTROMAGNET AND INCLUDING HEAT SENSITIVE CIRCUIT OPENING MEANS CONNECTED SO THAT UNDUE RISE OF TEMPERATURE WILL DE-ENERGIZE SAID ELECTROMAGNET RELEASING SAID ARMATURE AND PERMITTING SAID ARM TO MOVE TO A DOORCLOSED POSITION, WHEREBY THE DOOR IS POSITIVELY CLOSED IN THE EVENT OF FIRE AND AT ALL OTHER TIMES THE DOOR IS FREE TO BE MOVED TO ANY DESIRED POSITION.
References Cited (Backward Citations)
US1308006A
Cited
US1430192A
Cited
US1591709A
Cited
US1993224A
Cited
US2363021A
Cited
US2942291A
Cited
US3051982A
Cited
US3089568A
Cited
US3207273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |