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Patent US3268196A successfully refreshed from Google Patents.
US3268196A
Expired / Lapsed
US
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Safety lock for ladders
Assignee: Individual
•
Filing: 1964-12-22
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Granted: 1966-08-23
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Expires: 1984-12-22
Abstract
No abstract record available.
Inventors
- 👤 Sr John Anton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:40
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/48; E06C7/486
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
A LOCK FOR LADDERS, COMPRISING IN COMBINATION, A CLAMP FOR ENGAGING A ROOF GUTTER, A CLAMP FOR ENGAGING FROM BOTH SIDES THE TOP OF A LADDER, THE SECOND-MENTIONED CLAMP COMPRISING AN ELONGATED BRACKET WITH PROJECTING EDGES, TWO CLAMPING BRACKETS EMBRACED BY SAID EDGES AND SLIDABLE RELATIVELY TO THE FIRST-MENTIONED BRACKET, EACH OF SAID TWO CLAMPING BRACKETS HAVING A SEPARATE ANGULAR END PORTION EXTENDING OUTSIDE OF THE FIRST-MENTIONED BRACKET, THE ANGULAR END PORTIONS OF THE TWO CLAMPING BRACKETS EXTENDING TOWARD EACH OTHER, WHEREBY SAID ANGULAR END PORTIONS MAY CLAMP THE TOP OF A LADDER FROM OPPOSITE SIDES, SAID TWO CLAMPING BRACKETS HAVING ELONGATED SLOTS, A SCREW EXTENDING THROUGH AN OPENING IN THE FIRST-MENTIONED BRACKET AND THROUGH SAID SLOTS, A CONNECTING MEMBER HAVING A LOWER PLATE PORTION THROUGH WHICH SAID SCREW EXTENDS, A NUT CARRIED BY SAID SCREW AND ADAPTED TO PRESS SAID PLATE PORTION AGAINST SAID TWO CLAMPING BRACKETS AND SAID TWO CLAMPING BRACKETS AGAINST THE FIRST-MENTIONED BRACKET, SAID CONNECTING MEMBER ALSO HAVING AN UPPER PORTION; AND MEANS SWINGABLY CONNECTING THE FIRST-MENTIONED CLAMP WITH THE UPPER PORTION OF SAID CONNECTING MEMBER.
Claim 2
Dependent Claim
180 words
A LOCK FOR LADDERS, COMPRISING IN COMBINATION, A CLAMP FOR ENGAGING A ROOF GUTTER, A CLAMP FOR ENGAGING FROM BOTH SIDES THE TOP OF A LADDER, THE SECOND-MENTIONED CLAMP COMPRISING AN ELONGATED BRACKET WITH PROJECTING EDGES, TWO CLAMPING BRACKETS EMBRACED BY SAID EDGES AND SLIDABLE RELATIVELY TO THE FIRST-MENTIONED BRACKET, EACH OF SAID TWO CLAMPING BRACKETS HAVING A SEPARATE ANGULAR END PORTION EXTENDING OUTSIDE OF THE FIRST-MENTIONED BRACKET, THE ANGULAR END PORTIONS OF THE TWO CLAMPING BRACKETS EXTENDING TOWARD EACH OTHER, WHEREBY SAID ANGULAR END PORTIONS MAY CLAMP THE TOP OF A LADDER FROM OPPOSITE SIDES, SAID TWO CLAMPING BRACKETS HAVING ELONGATED SLOTS, A SCREW EXTENDING THROUGH AN OPENING IN THE FIRST-MENTIONED BRACKET AND THROUGH SAID SLOTS, A CONNECTING MEMBER HAVING A LOWER PLATE PORTION THROUGH WHICH SAID SCREW EXTENDS, A NUT CARRIED BY SAID SCREW AND ADAPTED TO PRESS SAID PLATE PORTION AGAINST SAID TWO CLAMPING BRACKETS AND SAID TWO CLAMPING BRACKETS AGAINST THE FIRST-MENTIONED BRACKET, SAID CONNECTING MEMBER ALSO HAVING AN UPPER PORTION; AND MEANS SWINGABLY CONNECTING THE FIRST-MENTIONED CLAMP WITH THE UPPER PORTION OF SAID CONNECTING MEMBER.
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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |