US4314490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torque wrench with alarm indicator
Assignee: Individual
•
Filing: 1980-06-30
•
Granted: 1982-02-09
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Expires: 2000-06-30
Abstract
Abstract A torque wrench is provided in which a removably attached alarm indicator produces an audible buzzing or visual indication when a pre-selected torque is applied by the torque wrench. In a preferred embodiment, an audible buzzer has a magnet in its base to facilitate removable attachment to a faceplate on the wrench, and also to make possible the use of the same audible buzzer on other torque wrenches. The audible buzzer may include an electrical circuit having a switch, battery, and buzzer all connected in series.
Inventors
- 👤 Gregory M. Stone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:27
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/14; B25B23/142; B25B23/1422; B25B23/1425; B25B23/1427
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
141 words
A torque wrench comprising: a mechanical arm having at one end a grip area adapted for the manual application of force to produce torque; a faceplate affixed to said mechanical arm in the vicinity of said grip for displaying torque calibration marks, said faceplate including a material capable of magnetic attraction; a pointer arm disposed on said mechanical arm to provide relative motion between said pointer arm and said faceplate affixed to said mechanical arm proportional to said torque; and alarm means including a magnet for removable magnetic attachment to said faceplate near a selected calibration mark thereon for producing an alarm indication when said pointer arm is coincident with a preselected calibration mark, said alarm means including a battery, an alarm indicator and switch means electrically interconnected to activate said indicator upon contact of said switch means by said pointer.
Claim 2
Dependent Claim
141 words
A torque wrench comprising: a mechanical arm having at one end a grip area adapted for the manual application of force to produce torque; a faceplate affixed to said mechanical arm in the vicinity of said grip for displaying torque calibration marks, said faceplate including a material capable of magnetic attraction; a pointer arm disposed on said mechanical arm to provide relative motion between said pointer arm and said faceplate affixed to said mechanical arm proportional to said torque; and alarm means including a magnet for removable magnetic attachment to said faceplate near a selected calibration mark thereon for producing an alarm indication when said pointer arm is coincident with a preselected calibration mark, said alarm means including a battery, an alarm indicator and switch means electrically interconnected to activate said indicator upon contact of said switch means by said pointer.
Claim 3
Dependent Claim
49 words
A torque wrench as in claim 1 wherein: said battery is in electrical contact with said faceplate; said faceplate is in electrical contact with said pointer; and said switch means includes an electrical contact to form a closed electrical circuit upon contact with said pointer to activate said indicator.
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) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |