Patent US3239072A successfully refreshed from Google Patents.
US3239072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hoisting fork
Assignee: D&M Equipment Co
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Filing: 1964-09-30
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Granted: 1966-03-08
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Expires: 1984-09-30
Abstract
No abstract record available.
Inventors
- 👤 Glenn G Dunbar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:33
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/10; B66C1/22; B66C1/24; B66C1/26; B60; B60P; B60P1/00; B60P1/54; B60P1/5404; B60P1/5423; B60P1/5433
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
232 words
IN COMBINATION WITH A HOISTING FORK COMPRISING A NORMALLY UPRIGHT SUBSTANTIALLY VERTICALLY EXTENDING FRAME HAVING A PLURALITY OF SPACED AND SUBSTANTIALLY PARALLEL AND ELONGATED TINE FEET EXTENDING SUBSTANTIALLY AT AN ANGLE TO THE FRAME AND LATERALLY FROM THE LOWER END THEREOF AND ADAPTED TO ENGAGE A LOAD TO BE LIFTED, A HOIST CONNECTING BEAM COMPRISING A PAIR OF SLEEVE ELEMENTS IN TELESCOPIC AXIALLY MOVABLE ENGAGEMENT WITH EACH OTHER, ONE OF THE SLEEVE ELEMENTS BEING IN ENGAGEMENT WITH AND EXTENDING AXIALLY FROM THE FRAME IN SUBSTANTIALLY PARALLEL RELATION TO THE TINE FEET TO THUS SUPPORT THE OTHER SLEEVE ELEMENT FOR AXIAL MOVEMENT ALONG A LINE IN PARALLEL RELATION TO THE TINE FEET; A HOIST CONNECTOR PART IN ENGAGEMENT WITH AND ON THE MENTIONED OTHER SLEEVE ELEMENT; A POWER ACTUATABLE MEANS WITHIN THE SLEEVE ELEMENTS AND IN ENGAGEMENT THEREWITH; A SOURCE OF POWER; AND A MANUALLY OPERABLE MEANS IN OPERATIVE ENGAGEMENT WITH THE SOURCE OF POWER AND THE POWER ACTUATABLE MEANS ADAPTED, WHEN OPERATED, TO CONNECT THE SOURCE OF POWER TO THE POWER ACTUATED MEANS AND THUS TO MOVE THE MENTIONED OTHER SLEEVE ELEMENT AND HOIST CONNECTOR PART ALONG THE LENGTH OF THE FIRST MENTIONED SLEEVE ELEMENT TO LOCATE THE HOIST CONNECTOR PART AND THUS THE CENTER OF APPLIED HOIST LIFT EFFORT IN A DESIRED REFERENCE TO A VERTICAL LINE EXTENDING THROUGH THE CENTER OF MASS OF A LOAD ENGAGED BY THE TINE FEET.
Claim 2
Dependent Claim
232 words
IN COMBINATION WITH A HOISTING FORK COMPRISING A NORMALLY UPRIGHT SUBSTANTIALLY VERTICALLY EXTENDING FRAME HAVING A PLURALITY OF SPACED AND SUBSTANTIALLY PARALLEL AND ELONGATED TINE FEET EXTENDING SUBSTANTIALLY AT AN ANGLE TO THE FRAME AND LATERALLY FROM THE LOWER END THEREOF AND ADAPTED TO ENGAGE A LOAD TO BE LIFTED, A HOIST CONNECTING BEAM COMPRISING A PAIR OF SLEEVE ELEMENTS IN TELESCOPIC AXIALLY MOVABLE ENGAGEMENT WITH EACH OTHER, ONE OF THE SLEEVE ELEMENTS BEING IN ENGAGEMENT WITH AND EXTENDING AXIALLY FROM THE FRAME IN SUBSTANTIALLY PARALLEL RELATION TO THE TINE FEET TO THUS SUPPORT THE OTHER SLEEVE ELEMENT FOR AXIAL MOVEMENT ALONG A LINE IN PARALLEL RELATION TO THE TINE FEET; A HOIST CONNECTOR PART IN ENGAGEMENT WITH AND ON THE MENTIONED OTHER SLEEVE ELEMENT; A POWER ACTUATABLE MEANS WITHIN THE SLEEVE ELEMENTS AND IN ENGAGEMENT THEREWITH; A SOURCE OF POWER; AND A MANUALLY OPERABLE MEANS IN OPERATIVE ENGAGEMENT WITH THE SOURCE OF POWER AND THE POWER ACTUATABLE MEANS ADAPTED, WHEN OPERATED, TO CONNECT THE SOURCE OF POWER TO THE POWER ACTUATED MEANS AND THUS TO MOVE THE MENTIONED OTHER SLEEVE ELEMENT AND HOIST CONNECTOR PART ALONG THE LENGTH OF THE FIRST MENTIONED SLEEVE ELEMENT TO LOCATE THE HOIST CONNECTOR PART AND THUS THE CENTER OF APPLIED HOIST LIFT EFFORT IN A DESIRED REFERENCE TO A VERTICAL LINE EXTENDING THROUGH THE CENTER OF MASS OF A LOAD ENGAGED BY THE TINE FEET.
References Cited (Backward Citations)
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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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |