Patent US4288105A successfully refreshed from Google Patents.
Patent US3656522A successfully refreshed from Google Patents.
US3656522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screwdriver with non-slip bit coating means
Assignee: BJORNS AIRMOTIVE CO
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Filing: 1970-10-02
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Granted: 1972-04-18
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Expires: 1990-10-02
Abstract
Abstract A tool for manually turning a threaded fastener. The example shown is a screwdriver having an integral supply of abrasive fluid stored within its handle. A supply passage extends through the axial tool shank in communication with the fluid supply and leads to an outlet orifice at the operative tip of the tool. By selectively discharging abrasive material at the tip while engaging a fastener such as a screw or similar member, one can effectively increase the frictional engagement between the tool tip and the fastener and thereby permit the application of greater torque without slippage of the tool.
Inventors
- 👤 Bjorn Rafnar Ingimarsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:00
CPC Classifications
B; B25; B25B; B25B23/00; B25B15/00; B25B15/02; Y; Y10; Y10S; Y10S173/00; Y10S173/03; Y10S81/00; Y10S81/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
In a tool for applying rotational torque to a fastener of the type comprising: a longitudinal shank; an operative tip end at one longitudinal end of the shank adapted to engage the fastener; and a grip at the remaining end of the shank adapted to be manually grasped for turning of the shank thereby during torque application; the improvement comprising: a source of friction enhancing material located within the grip; an elongated aperture extending longitudinally through the shank, said aperture being in open communication with the shank exterior at the tip end thereof and with said source of friction enhancing material; and means on said grip operatively associated with said source of friction enhancing material for selectively propelling the material from said source, through the aperture along said shank and to the shank exterior at the tip end thereof.
Claim 2
Dependent Claim
139 words
In a tool for applying rotational torque to a fastener of the type comprising: a longitudinal shank; an operative tip end at one longitudinal end of the shank adapted to engage the fastener; and a grip at the remaining end of the shank adapted to be manually grasped for turning of the shank thereby during torque application; the improvement comprising: a source of friction enhancing material located within the grip; an elongated aperture extending longitudinally through the shank, said aperture being in open communication with the shank exterior at the tip end thereof and with said source of friction enhancing material; and means on said grip operatively associated with said source of friction enhancing material for selectively propelling the material from said source, through the aperture along said shank and to the shank exterior at the tip end thereof.
Claim 3
Dependent Claim
57 words
The tool improvement as set out in claim 1 wherein the grip includes an open cavity formed coaxially with the shank aperture and in open communication therewith; and a collapsible container having an axial outlet, said container being adapted to be seated within the cavity of the grip with its outlet in communication with the shank aperture.
Claim 4
Dependent Claim
35 words
The tool improvement as seT out in claim 2 wherein the cavity of the grip extends axially through the end of the grip opposite to said shank for permitting access to the collapsible container therein.
Claim 5
Dependent Claim
16 words
The tool improvement as set out in claim 1 wherein the tool is an axial screwdriver.
Claim 6
Dependent Claim
17 words
The tool improvement as set out in claim 1 wherein the tool is a Phillips type screwdriver.
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |