Patent US3300233A successfully refreshed from Google Patents.
US3300233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Towbar
Assignee: Lockheed Martin Corp
•
Filing: 1965-02-19
•
Granted: 1967-01-24
•
Expires: 1985-02-19
Abstract
No abstract record available.
Inventors
- 👤 David C Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:38
CPC Classifications
B; B60; B60D; B60D1/00; B60D1/24; B60D1/249; B60D1/14; B60D1/145; B60D1/155; B64; B64F; B64F1/00; B64F1/22; B64F1/223; B64F1/224; Y; Y10; Y10T; Y10T403/00; Y10T403/53
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
232 words
A TOWBAR FOR A VEHICLE COMPRISING: A FIRST HOLLOW SHAFT FORMED WITH A SERIES OF FLEXIBLE FINGERS EXTENDING AROUND THE SHAFT AT ONE END, A SECOND SHAFT EXTENDING WITHIN THE FIRST SHAFT AND INCLUDING AN ANNULAR GROOVE, THE FIRST SHAFT FLEXED FINGERS EACH INCLUDING A TOOTH EXTENDING WITHIN THE SECOND SHAFT GROOVE SUCH THAT THE FIRST SHAFT IS LINKED TO THE SECOND SHAFT, A COLLAR THREADED ON AND ROTATABLE RELATIVE TO THE FIRST SHAFT AND INCLUDING A SURFACE WHICH MATES WITH THE FLEXIBLE FINGERS AND ROTATION OF THE COLLAR ON THE FIRST SHAFT CHANGES THE PORTION OF THE FINGERS WHICH ARE FLEXIBLE, A SERIES OF SPACERS DISPOSED BETWEEN THE COLLAR AND THE FIRST STOP TO ACT AS A STOP FOR THE COLLAR AND WHICH PERMIT REMOVAL TO FORM A VARIABLE STOP FOR THE COLLAR, THE SECOND SHAFT HAS A PLURALITY OF CAVITIES ON OPPOSITE SIDES OF THE ANNULAR GROOVE AND ALIGNED WITH THE SHAFT FINGERS AND THE CAVITIES ARE USED TO GENERATE A NOISE IN THE EVENT THE SHAFTS TELESCOPE, AND A PLURALITY OF RESILIENT DISCS DISPOSED IN THE FIRST SHAFT FOR CUSHIONING THE SECOND SHAFT WHEN THE SHAFTS TELESCOPE TOWARD EACH OTHER; WHEREBY THE TWO SHAFTS MOVE AS A UNIT UNTIL A PREDETERMINED FORCE AGAINST THE SHAFTS FORCES THE TAPERED TEETH ON THE FLEXIBLE FINGERS OUT OF THE ANNULAR GROOVE AND THEREBY PERMITS THE SHAFTS TO TELESCOPE RELATIVE TO EACH OTHER.
Claim 2
Dependent Claim
232 words
A TOWBAR FOR A VEHICLE COMPRISING: A FIRST HOLLOW SHAFT FORMED WITH A SERIES OF FLEXIBLE FINGERS EXTENDING AROUND THE SHAFT AT ONE END, A SECOND SHAFT EXTENDING WITHIN THE FIRST SHAFT AND INCLUDING AN ANNULAR GROOVE, THE FIRST SHAFT FLEXED FINGERS EACH INCLUDING A TOOTH EXTENDING WITHIN THE SECOND SHAFT GROOVE SUCH THAT THE FIRST SHAFT IS LINKED TO THE SECOND SHAFT, A COLLAR THREADED ON AND ROTATABLE RELATIVE TO THE FIRST SHAFT AND INCLUDING A SURFACE WHICH MATES WITH THE FLEXIBLE FINGERS AND ROTATION OF THE COLLAR ON THE FIRST SHAFT CHANGES THE PORTION OF THE FINGERS WHICH ARE FLEXIBLE, A SERIES OF SPACERS DISPOSED BETWEEN THE COLLAR AND THE FIRST STOP TO ACT AS A STOP FOR THE COLLAR AND WHICH PERMIT REMOVAL TO FORM A VARIABLE STOP FOR THE COLLAR, THE SECOND SHAFT HAS A PLURALITY OF CAVITIES ON OPPOSITE SIDES OF THE ANNULAR GROOVE AND ALIGNED WITH THE SHAFT FINGERS AND THE CAVITIES ARE USED TO GENERATE A NOISE IN THE EVENT THE SHAFTS TELESCOPE, AND A PLURALITY OF RESILIENT DISCS DISPOSED IN THE FIRST SHAFT FOR CUSHIONING THE SECOND SHAFT WHEN THE SHAFTS TELESCOPE TOWARD EACH OTHER; WHEREBY THE TWO SHAFTS MOVE AS A UNIT UNTIL A PREDETERMINED FORCE AGAINST THE SHAFTS FORCES THE TAPERED TEETH ON THE FLEXIBLE FINGERS OUT OF THE ANNULAR GROOVE AND THEREBY PERMITS THE SHAFTS TO TELESCOPE RELATIVE TO EACH OTHER.
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) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |