US3298210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elevator shaft door safety mechanism
Assignee: Elevator Specialties Corp
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Filing: 1964-12-29
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Granted: 1967-01-17
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Expires: 1984-12-29
Abstract
No abstract record available.
Inventors
- 👤 George L Nyborg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:40
CPC Classifications
B; B66; B66B; B66B13/00; B66B13/24; Y; Y10; Y10T; Y10T70/00; Y10T70/50; Y10T70/5093; Y10T70/5155; Y10T70/70; Y10T70/7441; Y10T70/7486; Y10T70/7508; Y10T70/7559; Y10T70/7661; Y10T70/80; Y10T70/8432; Y10T70/8459; Y10T70/8486
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
AN ELEVATOR SHAFT DOOR SAFETY APPARATUS COMPRISING IN COMBINATION AN ELEVATOR SHAFT DOOR, A SIDE OF SAID DOOR FACING A SHAFT; A DOOR LATCHING LINKAGE AND LATCH DISPOSED ON THE SHAFT SIDE OF SAID DOOR FOR THE OPENING AND CLOSING THEREOF; A MEMBER, COMPRISING A TUBE, SECURED THROUGH A DOOR APERTURE ADJACENT A PORTION OF SAID LINKAGE WHICH PERMITS RELEASE OF SAID LATCH, SAID MEMBER INCLUDING BOLT RETAINING MEANS; A CYLINDRICAL LOCK REMOVABLY INSERTABLE IN SAID TUBULAR MEMBER; AND A BOLT OPERABLE BY THE MECHANISM OF SAID LOCK AND DISPOSED THEREON TO ENGAGE SAID BOLT RETAINING MEANS WHEN THE LOCK FACE IS SUBSTANTIALLY FLUSH TO THE OUTSIDE OF THE SHAFT DOOR WHEREBY DISENGAGEMENT OF SAID BOLT FROM SAID BOLT RETAINING MEANS PERMITS SAID LOCK TO BE REMOVED FROM SAID TUBULAR MEMBER, THEREBY ALLOWING ACCESS THROUGH SAID TUBULAR MEMBER TO SAID PORTION OF SAID LATCHING LINKAGE IN ORDER TO RELEASE SAID LATCH.
Claim 2
Dependent Claim
151 words
AN ELEVATOR SHAFT DOOR SAFETY APPARATUS COMPRISING IN COMBINATION AN ELEVATOR SHAFT DOOR, A SIDE OF SAID DOOR FACING A SHAFT; A DOOR LATCHING LINKAGE AND LATCH DISPOSED ON THE SHAFT SIDE OF SAID DOOR FOR THE OPENING AND CLOSING THEREOF; A MEMBER, COMPRISING A TUBE, SECURED THROUGH A DOOR APERTURE ADJACENT A PORTION OF SAID LINKAGE WHICH PERMITS RELEASE OF SAID LATCH, SAID MEMBER INCLUDING BOLT RETAINING MEANS; A CYLINDRICAL LOCK REMOVABLY INSERTABLE IN SAID TUBULAR MEMBER; AND A BOLT OPERABLE BY THE MECHANISM OF SAID LOCK AND DISPOSED THEREON TO ENGAGE SAID BOLT RETAINING MEANS WHEN THE LOCK FACE IS SUBSTANTIALLY FLUSH TO THE OUTSIDE OF THE SHAFT DOOR WHEREBY DISENGAGEMENT OF SAID BOLT FROM SAID BOLT RETAINING MEANS PERMITS SAID LOCK TO BE REMOVED FROM SAID TUBULAR MEMBER, THEREBY ALLOWING ACCESS THROUGH SAID TUBULAR MEMBER TO SAID PORTION OF SAID LATCHING LINKAGE IN ORDER TO RELEASE SAID LATCH.
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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) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |