US4016912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screwdriver for slotted head screw
Assignee: Individual
•
Filing: 1975-12-15
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Granted: 1977-04-12
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Expires: 1995-12-15
Abstract
Abstract A screwdriver of the type adapted to drive a slotted head screw and which is particularly adapted to firmly engage in a dull or deformed slot of such screw to drive the latter. This screwdriver includes a shank formed at one end with a head having a strikable end face and at the other end with a screw driving bit including a blade having a transverse outer edge, opposite side edges extending along the blade lengthwise of the shank, and protuberances on opposite sides of the blade at the opposite side edges thereof and extending lengthwise of the shank outwardly coextensive with the transverse edge to engage with the latter in a dull or deformed slot of a slotted head screw.
Inventors
- 👤 Lionel St-Amour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:46
CPC Classifications
B; B25; B25B; B25B15/00; B25B15/001; B25B15/004; B25B15/007
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
188 words
A screwdriver for a screw having a slot of predetermined length and predetermined width on the head thereof, said screwdriver comprising a shank, a handle and a screwdriving bit fixed at the opposite ends of said shank, said screwdriving bit having opposite faces converging toward each other lengthwise of said shank and toward a cooperatively formed straight outer edge extending lengthwise transversely of said shank, having an overall length exceeding the predetermined length of said slot, and having a central portion of even thickness not exceeding said predetermined width and of a length less than said predetermined length, said opposite faces having opposite lateral edges extending lengthwise longitudinally of said shank, protuberances on said opposite faces at said opposite lateral edges ending lengthwise of said shank outwardly coextensive with said straight outer edge, and said bit at said straight outer edge progressively increasing in thickness at both ends of the outer edge, from said central portion of even thickness to the corresponding ends respectively of the straight outer edge, thereby producing tight engagement of part of said ends of increased thickness in the opposite ends of said slot.
Claim 2
Dependent Claim
188 words
A screwdriver for a screw having a slot of predetermined length and predetermined width on the head thereof, said screwdriver comprising a shank, a handle and a screwdriving bit fixed at the opposite ends of said shank, said screwdriving bit having opposite faces converging toward each other lengthwise of said shank and toward a cooperatively formed straight outer edge extending lengthwise transversely of said shank, having an overall length exceeding the predetermined length of said slot, and having a central portion of even thickness not exceeding said predetermined width and of a length less than said predetermined length, said opposite faces having opposite lateral edges extending lengthwise longitudinally of said shank, protuberances on said opposite faces at said opposite lateral edges ending lengthwise of said shank outwardly coextensive with said straight outer edge, and said bit at said straight outer edge progressively increasing in thickness at both ends of the outer edge, from said central portion of even thickness to the corresponding ends respectively of the straight outer edge, thereby producing tight engagement of part of said ends of increased thickness in the opposite ends of said slot.
Claim 3
Dependent Claim
33 words
A screwdriver as defined in claim 1, wherein said protuberances are formed one on each of the two opposite faces of the blade and adjacent said opposite lateral edges respectively of the blade.
Claim 4
Dependent Claim
28 words
A screwdriver as defined in claim 1, wherein said protuberances are formed on the two opposite faces of the blade at each of said opposite lateral edges respectively.
Claim 5
Dependent Claim
29 words
A screwdriver as defined in claim 1, wherein said one end of the shank is enlarged relative to the latter and has a blunt end face for striking thereon.
Claim 6
Dependent Claim
27 words
A screwdriver as defined in claim 4, wherein said handle constitutes a centrally apertured body inserted around said shank in outward abutment against said enlarged one end.
Claim 7
Dependent Claim
28 words
A screwdriver as defined in claim 5, wherein said protuberances are formed on the two opposite faces of the blade at each of said opposite lateral edges respectively.
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) | 1980-04-11 | 1980-10-11 | 1981-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-11 | 1984-10-11 | 1985-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-11 | 1988-10-11 | 1989-04-12 | $7700.00 | Window Closed / Lapsed |