Patent US3972242A successfully refreshed from Google Patents.
US3972242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic wrench
Assignee: Standard Oil Co
•
Filing: 1974-08-30
•
Granted: 1976-08-03
•
Expires: 1994-08-30
Abstract
Abstract A high-torque hydraulic wrench useful for tightening and loosening bolts and nuts on heavy machinery is described.
Inventors
- 👤 Roy C. Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:01
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/0078; B25B21/00; B25B21/004; B25B21/005; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18088; Y10T74/18096
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
112 words
A high torque wrench apparatus comprising a rack and ratchet, said ratchet being operatively connected to a wrench, said rack being linearly reciprocally forwardly and backwardly operative by hydraulic means, said rack being part of a hydraulic ram, said ram also being equipped with a lock-down cam, said lock-down cam being slidably raised or lowered by means of a retract plate on respective forward or backward movement of the ram so that when the ram moves in a forward direction the lock-down cam forces the rack to engage and drive the ratchet, and when the ram moves in a backward direction the lock-down cam releases the rack from engagement with the ratchet.
Claim 2
Dependent Claim
112 words
A high torque wrench apparatus comprising a rack and ratchet, said ratchet being operatively connected to a wrench, said rack being linearly reciprocally forwardly and backwardly operative by hydraulic means, said rack being part of a hydraulic ram, said ram also being equipped with a lock-down cam, said lock-down cam being slidably raised or lowered by means of a retract plate on respective forward or backward movement of the ram so that when the ram moves in a forward direction the lock-down cam forces the rack to engage and drive the ratchet, and when the ram moves in a backward direction the lock-down cam releases the rack from engagement with the ratchet.
Claim 3
Dependent Claim
12 words
The wrench of claim 1 which is supported on a mounting stand.
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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |