US3783716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tool devices of the variable torque type
Assignee: Tokyo Ferrite Mfg Co Ltd
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Filing: 1972-01-19
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Granted: 1974-01-08
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Expires: 1992-01-19
Abstract
Abstract In a tool device of the type comprising rotary driving means, a working tool and a clutch adapted to couple the working tool with the rotary driving means, the clutch comprises a first magnetized disc driven by the rotary driving means and a second magnetized disc confronting the first magnetized disc and connected to the working tool and wherein means is provided for varying the spacing between the first and second magnetized discs whereby to adjust the torque applied to the working tool.
Inventors
- 👤 S Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:33
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A tool device of the variable torque type comprising rotary driving means, a working tool, a clutch adapted to couple said working tool with said driving means, said clutch including a first magnetized disc driven by said rotary driving means and a second magnetized disc confronting said first magnetized disc and connected to said working tool, and means for varying the spacing between said first and second magnetized discs whereby to adjust the torque applied to said working tool.
Claim 2
Dependent Claim
79 words
A tool device of the variable torque type comprising rotary driving means, a working tool, a clutch adapted to couple said working tool with said driving means, said clutch including a first magnetized disc driven by said rotary driving means and a second magnetized disc confronting said first magnetized disc and connected to said working tool, and means for varying the spacing between said first and second magnetized discs whereby to adjust the torque applied to said working tool.
Claim 3
Dependent Claim
22 words
The tool device according to claim 1 wherein a speed reducer is interposed between said second magnetized disc and said working tool.
Claim 4
Dependent Claim
42 words
The tool device according to claim 1 wherein said first and second magnetized discs are magnetized to have the same number of poles so tHat these discs slip relative with each other when a predetermined set value of the torque is exceeded.
Claim 5
Dependent Claim
61 words
The tool device according to claim 1 wherein said last mentioned means comprises a threaded shaft secured to said rotary driving means coaxially therewith, a nut mating said threaded shaft to axially move said rotary driving means thereby varying the spacing between said first and second magnetized discs, and a set screw for holding said threaded shaft in an adjusted position.
Claim 6
Dependent Claim
68 words
The tool device according to claim 1 wherein said rotary driving means and said clutch are coaxially contained in a cylindrical casing, said casing is provided with a longitudinal slot, and a pointer extending through said slot is secured to said rotary driving means to cooperate with a scale graduated on the peripheral surface of said casing for indicating the spacing between said first and second magnetized discs.
Claim 7
Dependent Claim
46 words
The tool device according to claim 1 wherein said rotary driving means and said clutch are coaxially contained in an elongated casing and indicator means responsive to the axial position of said rotary driving means for indicating the spacing between said first and second magnetized discs.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |