Patent US3172544A successfully refreshed from Google Patents.
US3172544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slack puller
Assignee: Individual
•
Filing: 1962-12-31
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Granted: 1965-03-09
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Expires: 1982-12-31
Abstract
No abstract record available.
Inventors
- 👤 Johnson Peer Richard
- 👤 Frank B Hanna
- 👤 William J Pullar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:16
CPC Classifications
B; B66; B66B; B66B7/00; B66B7/06; B66D; B66D3/00; B66D3/12; B66D2700/00; B66D2700/02; B66D2700/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A SLACK PULLING DEVICE FOR USE WITH A LOAD LIFTING CABLE; SAID DEVICE INCLUDING MEANS MOUNTING A FREELY ROTATABLE SHAFT, A SHEAVE WHEEL ROTATABLY MOUNTED ON SAID SHAFT, WITH SAID LOAD LIFTING CABLE RUNNING THEREOVER, A ONE-WAY CLUTCH ASSOCIATED WITH SAID SHEAVE AND SHAFT OPERABLE TO EFFECT A DRIVING CONNECTION BETWEEN THEM INCIDENT TO THAT DRIVING OF SAID SHEAVE THAT IS EFFECTED BY THE INWINDING OF SAID LOAD LIFTING CABLE, IN ITS RUNNING THEREOVER, AND AT LEAST ONE POWERING SPRING HAVING AN OPERATIVE CONNECTION WITH SAID SHAFT WHEREBY TENSION OF THEREIN IS INCREASED BY THE DRIVING OF THE SHAFT BY THE SHEAVE WHEEL, AND THROUGH WHICH CONNECTION TENSION OF THE SPRING IS EXPENDED TO DRIVE SAID SHAFT AND SHEAVE WHEEL TO DRAW SLACK FROM THE LOAD LIFTING CABLE.
Claim 2
Dependent Claim
128 words
A SLACK PULLING DEVICE FOR USE WITH A LOAD LIFTING CABLE; SAID DEVICE INCLUDING MEANS MOUNTING A FREELY ROTATABLE SHAFT, A SHEAVE WHEEL ROTATABLY MOUNTED ON SAID SHAFT, WITH SAID LOAD LIFTING CABLE RUNNING THEREOVER, A ONE-WAY CLUTCH ASSOCIATED WITH SAID SHEAVE AND SHAFT OPERABLE TO EFFECT A DRIVING CONNECTION BETWEEN THEM INCIDENT TO THAT DRIVING OF SAID SHEAVE THAT IS EFFECTED BY THE INWINDING OF SAID LOAD LIFTING CABLE, IN ITS RUNNING THEREOVER, AND AT LEAST ONE POWERING SPRING HAVING AN OPERATIVE CONNECTION WITH SAID SHAFT WHEREBY TENSION OF THEREIN IS INCREASED BY THE DRIVING OF THE SHAFT BY THE SHEAVE WHEEL, AND THROUGH WHICH CONNECTION TENSION OF THE SPRING IS EXPENDED TO DRIVE SAID SHAFT AND SHEAVE WHEEL TO DRAW SLACK FROM THE LOAD LIFTING CABLE.
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) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |