US4440517A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable torque-multiplier breaker-bar
Assignee: Individual
•
Filing: 1981-03-23
•
Granted: 1984-04-03
•
Expires: 2001-03-23
Abstract
Abstract An adjustably extensible torque-multiplier breaker-bar for applying variable torques to a tool headpiece. The device employs a telescoping inner member received within a sleeve member thus comprising a breaker-bar which permits the user to exploit the advantages of the principles of physics involved. An outer sleeve member carries a slideably adjustable inner member such that both members provide cooperatively for stepped length adjustment so as to shorten or lengthen the overall longitudinal dimension of the telescoping breaker-bar. Such extension and retraction allows a user to modify the mechanical advantage of the tool in accordance with mechanical theories of physics.
Inventors
- 👤 Michael A. Potter
- 👤 Richard L. Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:01
CPC Classifications
F; F16; F16B; F16B7/00; F16B7/10; F16B7/105; Y; Y10; Y10T; Y10T403/00; Y10T403/60; Y10T403/602; Y10T403/604
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
150 words
An adjustable, torque-multiplier breaker-bar which comprises: an elongated sleeve; a plurality of interior annular grooves in stepped positions along the longitudinal dimension of said sleeve; a headpiece secured near the distal end of said sleeve including a headpiece collar secured about said sleeve and said headpiece collar having a tool-holding member; a rod, slideably inserted into said sleeve at the proximal end thereof, the rod having a handgrip attached at the proximal end of said rod; biasing ball and spring means near the distal end of said rod for cooperating with said annular grooves in maintaining an adjusted position of insertion of said rod into said sleeve; and wherein the specific number of said plurality of interior annular grooves is at least one per inch and with the groove closest to the distal end of said sleeve lying in a transverse plane intermediate the terminal ends of said headpiece collar.
Claim 2
Dependent Claim
150 words
An adjustable, torque-multiplier breaker-bar which comprises: an elongated sleeve; a plurality of interior annular grooves in stepped positions along the longitudinal dimension of said sleeve; a headpiece secured near the distal end of said sleeve including a headpiece collar secured about said sleeve and said headpiece collar having a tool-holding member; a rod, slideably inserted into said sleeve at the proximal end thereof, the rod having a handgrip attached at the proximal end of said rod; biasing ball and spring means near the distal end of said rod for cooperating with said annular grooves in maintaining an adjusted position of insertion of said rod into said sleeve; and wherein the specific number of said plurality of interior annular grooves is at least one per inch and with the groove closest to the distal end of said sleeve lying in a transverse plane intermediate the terminal ends of said headpiece collar.
Claim 3
Dependent Claim
24 words
The device of claim 1, wherein said sleeve is a hollow cylinder having a plurality of stepped interior annular grooves along its interior dimension.
Claim 4
Dependent Claim
22 words
The device of claim 2, wherein said rod is a solid cylinder having a ball and spring means near one end thereof.
Claim 5
Dependent Claim
25 words
The device of claim 3, wherein said tool-holding member is of the type usually associated with socket wrenches such as are used in everyday commerce.
References Cited (Backward Citations)
US1234455A
Cited
US1284351A
Cited
US1741969A
Cited
US2051953A
Cited
US2282148A
Cited
US2263508A
Cited
US2777692A
Cited
US2963930A
Cited
US3306639A
Cited
US4047821A
Cited
US4070932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |