Hex keys and other tools with non-slip feature

Details Hex keys and other tools with non-slip feature Hex keys and other tools with non-slip feature

1997-10-28

1999-07-27

Scherbel, David A.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

81442, 81443, B25B 2308

Patent

active

059271655

ABSTRACT:
The fastener-driving tool has an locking insert which expands or displaces to more securely lock the tool in the fastener. The tool has a distal end configured to engage a driving recess in a fastener, and has an annular recess adjacent the distal end, with a reduced cross-section at the annular recess, other than an axial circular cross-section. A locking insert having a generally similar cross-section to that of the distal end is positioned in the annular recess closely around the reduced cross-section. The locking insert may have a split portion which permits expansion of the locking insert when acted upon by the reduced cross-section as a result of rotation of the distal end relative to the locking insert, or may provide locking simply by displacement resulting from being acted upon by the reduced cross-section.

REFERENCES:
patent: 785162 (1905-03-01), Freytag
patent: 2455005 (1948-11-01), Hall
patent: 3733937 (1973-05-01), Mezey
patent: 5179877 (1993-01-01), Down et al.

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