US3753454A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw driver bit with double blades
Assignee: Individual
•
Filing: 1971-07-09
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Granted: 1973-08-21
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Expires: 1991-07-09
Abstract
Abstract A screw suspension driver with substitutable double bits which are inserted into the tip portion of the screw driver shaft. The double bits have end edges which are recessed to form stepped portions and individual of the bits at its center portion being provided with a projection adapted to be inserted into the guide hole in the screw head.
Inventors
- 👤 K Totsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:20
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/02; B25B23/08; B25B23/10; B25B23/105; B25B23/106
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
111 words
A screw suspension driver including a gripping portion, a driver shaft extending at one of its ends from the gripping portion, and a screw suspension bit extending from the other end portion of the driVer shaft, said bit comprising two sheets of elastic bit members of substantially the same shape and having a portion inserted into the tip end of the driver shaft with the members in back-to-back relation, and with a predetermined lateral separation between the outwardly projecting end edge portions of said elastic members, each said end edge portions of each bit member having terminal edges lying in vertically spacedapart planes and adapted for insertion in a screw slot.
Claim 2
Dependent Claim
111 words
A screw suspension driver including a gripping portion, a driver shaft extending at one of its ends from the gripping portion, and a screw suspension bit extending from the other end portion of the driVer shaft, said bit comprising two sheets of elastic bit members of substantially the same shape and having a portion inserted into the tip end of the driver shaft with the members in back-to-back relation, and with a predetermined lateral separation between the outwardly projecting end edge portions of said elastic members, each said end edge portions of each bit member having terminal edges lying in vertically spacedapart planes and adapted for insertion in a screw slot.
Claim 3
Dependent Claim
157 words
A screw suspension driver comprising a gripping portion, a shaft portion extending at one end thereof from said gripping portion, and a screw suspension bit extending from the opposite end of said shaft portion, said screw suspension bit comprising a pair of like-shaped flexible members supported by said shaft portion in back-to-back relation and with the tip end portion of said flexible members resiliently urged in spaced apart relation a predetermined distance, each flexible member terminating in first and second edges, the first of which is recessed with respect to the second, each of said second edges of said pair of members being adapted upon predetermined orientation to enter a screw slot of width less than said predetermined distance and bearing, upon rotation thereof, against walls of said slot to reduce the distance between the tip end portions of the bit whereby to permit entry of said first edges of said pair of members in said slot.
Claim 4
Dependent Claim
157 words
A screw suspension driver comprising a gripping portion, a shaft portion extending at one end thereof from said gripping portion, and a screw suspension bit extending from the opposite end of said shaft portion, said screw suspension bit comprising a pair of like-shaped flexible members supported by said shaft portion in back-to-back relation and with the tip end portion of said flexible members resiliently urged in spaced apart relation a predetermined distance, each flexible member terminating in first and second edges, the first of which is recessed with respect to the second, each of said second edges of said pair of members being adapted upon predetermined orientation to enter a screw slot of width less than said predetermined distance and bearing, upon rotation thereof, against walls of said slot to reduce the distance between the tip end portions of the bit whereby to permit entry of said first edges of said pair of members in said slot.
Claim 5
Dependent Claim
56 words
A screwdriver according to claim 1, wherein each bit member has a substantially rectangular form and includes a tail portion within the driver shaft extending from one side of the rectangular form and a center projection at an opposite side of the rectangular form, said terminal edges extending in opposite lateral directions from said center projection.
Claim 6
Dependent Claim
41 words
A screwdriver according to claim 3, wherein said predetermined lateral separation between the facing inner surfaces of the outwardly projecting end edge portions of said elastic members is one fourth the distance between the outwardly facing surfaces of the bit members.
Claim 7
Dependent Claim
24 words
A screwdriver according to claim 1 wherein the driver shaft at its tip end portion is provided with a sleeve extending beyond said bit.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |