Patent US3604487A successfully refreshed from Google Patents.
US3604487A
Expired / Lapsed
US
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Orthopedic screw driving means
Assignee: Individual
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Filing: 1969-03-10
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Granted: 1971-09-14
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Expires: 1989-03-10
Abstract
Abstract A combination of an orthopedic screw and driving means which enables the screw to be started and driven in a single continuous operation with one hand. The screwhead has multiple slots, and the driving means has multiple pinching blades for engaging the slots to provide a rigid grip of the screw.
Inventors
- 👤 Richard S Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:04
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8605; A61B17/861; A61B17/88; A61B17/8875; A61B17/8877; A61B17/8886; B; B25; B25B; B25B23/00; B25B23/02; B25B23/08; B25B23/10; B25B23/105; B25B23/106; F; F16; F16B; F16B23/00; F16B23/0007; Y; Y10; Y10S; Y10S411/00; Y10S411/919
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
219 words
In a screwdriver for starting and driving a screw having an axially elongate threaded stem with a head at one end thereof and a pair of spaced-apart axially inclined slots opening through the upper surface of said head, a pair of axially extending blades having generally planar axially inclined tip portions at the lower end thereof and a conically tapered portion extending radially outward intermediate said tip portions and the upper end of said blades, an axially extending sleeve surrounding a portion of said blades intermediate the conical portion and said upper end, the lower portion of said sleeve slidably engaging the tapered surface of said conical portion, an axially extending handle member surrounding a portion of said blades toward their upper end, said handle member being constrained against axial and rotational movement relative to said blades, and an axially extending resilient member disposed within said handle member, the upper end of said resilient member being constrained against axial movement and the lower end of said resilient member engaging the upper portion of said sleeve member, said resilient member tending to urge the lower portion of said sleeve against the tapered portion of said conical portion, thereby urging the blades together to provide interlocking engagement between the tip portions of the Blades and the inclined slots of the screwhead.
Claim 2
Dependent Claim
219 words
In a screwdriver for starting and driving a screw having an axially elongate threaded stem with a head at one end thereof and a pair of spaced-apart axially inclined slots opening through the upper surface of said head, a pair of axially extending blades having generally planar axially inclined tip portions at the lower end thereof and a conically tapered portion extending radially outward intermediate said tip portions and the upper end of said blades, an axially extending sleeve surrounding a portion of said blades intermediate the conical portion and said upper end, the lower portion of said sleeve slidably engaging the tapered surface of said conical portion, an axially extending handle member surrounding a portion of said blades toward their upper end, said handle member being constrained against axial and rotational movement relative to said blades, and an axially extending resilient member disposed within said handle member, the upper end of said resilient member being constrained against axial movement and the lower end of said resilient member engaging the upper portion of said sleeve member, said resilient member tending to urge the lower portion of said sleeve against the tapered portion of said conical portion, thereby urging the blades together to provide interlocking engagement between the tip portions of the Blades and the inclined slots of the screwhead.
Claim 3
Dependent Claim
27 words
A screwdriver as in claim 1 further including adjusting means threadedly mounted on the upper portion of said blades for adjusting the tension in said resilient member.
Claim 4
Dependent Claim
70 words
A screwdriver as in claim 2 wherein said adjusting means includes an axially threaded member having a generally planar lower surface and wherein the upper end of said handle member is formed to include a radially extending shoulder portion, the upper surface of said shoulder portion engaging the lower surface of the adjusting member and the lower surface of said shoulder portion engaging the upper end of said resilient member.
Claim 5
Dependent Claim
42 words
A screwdriver as in claim 3 further including a radially extending lug member carried by one of said blades and an axially extending slot formed in the shoulder portion of said handle member, said lug member being slidably disposed in said slot.
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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |