US3678744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torque measuring hand screwdriver
Assignee: Dresser Industries Inc
•
Filing: 1969-11-14
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Granted: 1972-07-25
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Expires: 1989-11-14
Abstract
Abstract A torque measuring hand screwdriver in which applied torque is transmitted to the drive bit by means of a torque bar extending axially continuous between the gripping handle and bit support. The bar end connections permit an axial floating to accommodate linear contraction concomitantly with twist. A scale gauge calibrated in torque units registers measured twist as applied torque.
Inventors
- 👤 Raymond J Blattner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:56
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/14; B25B23/142; B25B23/1422; B25B23/1427
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
177 words
A torque screwdriver comprising: a. a gripping handle to which torsion moment can be applied; b. an elongated shank supportably connected to said gripping handle for rotation relative thereto and extending coaxially away from said gripping handle to a terminal end at which to support a work engaging drive bit; c. an elongated torque bar extending coaxially with said shank; and d. means connecting said torque bar in a rotatably secure relation at one end to said gripping handle and at the other end to said shank at a location displaced from said gripping handle; e. said connecting means comprising a connecting member secured to said torque bar at at least one of said located connections extending non-circular in an axial direction into a contiguous, complementary, non-circular interfit with at least one of the handle and shank effecting a rotatable interlock and an axially slideable relation therebetween for providing said torque bar freedom of linear contraction in response to an applied torsion moment transmitted between said gripping handle and a supported drive bit in work engaging relation.
Claim 2
Dependent Claim
177 words
A torque screwdriver comprising: a. a gripping handle to which torsion moment can be applied; b. an elongated shank supportably connected to said gripping handle for rotation relative thereto and extending coaxially away from said gripping handle to a terminal end at which to support a work engaging drive bit; c. an elongated torque bar extending coaxially with said shank; and d. means connecting said torque bar in a rotatably secure relation at one end to said gripping handle and at the other end to said shank at a location displaced from said gripping handle; e. said connecting means comprising a connecting member secured to said torque bar at at least one of said located connections extending non-circular in an axial direction into a contiguous, complementary, non-circular interfit with at least one of the handle and shank effecting a rotatable interlock and an axially slideable relation therebetween for providing said torque bar freedom of linear contraction in response to an applied torsion moment transmitted between said gripping handle and a supported drive bit in work engaging relation.
Claim 3
Dependent Claim
37 words
A torque screwdriver according to claim 1 including measuring means for registering the magnitude of applied torsion moment as a function of relative angular displacement between said gripping handle and a drive bit in work engaging relation.
Claim 4
Dependent Claim
33 words
A torque screwdriver according to claim 2 in which said measuring means includes memory means continuing to register maximum applied torsion moment after an applied torsion moment is removed from said gripping handle.
Claim 5
Dependent Claim
19 words
A torque screwdriver according to claim 1 in which said shank comprises a tube extending about said torque bar.
Claim 6
Dependent Claim
37 words
A torque screwdriver according to claim 4 including measuring means for registering the magnitude of applied torsion moment as a function of relative angular displacement between said gripping handle and a drive bit in work engaging relation.
Claim 7
Dependent Claim
38 words
A torque screwdriver according to claim 5 in which said measuring means comprises a relatively movable scale and pointer, one of which is secured to said gripping handle and the other of which is secured to said shank.
Claim 8
Dependent Claim
33 words
A torque screwdriver according to claim 6 in which said measuring means includes memory means continuing to register maximum applied torsion moment after an applied torsion moment is removed from said gripping handle.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |