Expandable drive tool tip for screw retention

Details Expandable drive tool tip for screw retention Expandable drive tool tip for screw retention

1990-05-22

1991-06-25

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

81444, 81453, B25B 2310

Patent

active

050256882

ABSTRACT:
A fastener drive tool for applying a rotational torque to a threaded fastener for driving the fastener into or out of a workpiece. The drive tool has an elongated shaft portion with a free end which is selectively controllably engageable with a recess formed in the fastener. The free end is formed with a fastener engaging expansion portion. The expansion portion is operated by a draw shaft being selectively lockable in a bit retaining position. The expansion portion of the bit portion creates substantial fastener retaining forces on the opposing internal surfaces of the fastener recess in which it is inserted.

REFERENCES:
patent: 1058454 (1913-04-01), Moores
patent: 2506922 (1950-05-01), Hansen
patent: 2562347 (1951-07-01), Young
patent: 3150698 (1964-09-01), Neil
patent: 3584667 (1971-06-01), Reiland
Line Head System, Inc., Fastening System brochure, date approximately 1990, General Reference.
Snap-on Medical Products, "Captive Twist" information sheet, date approximately 1990, General Reference.

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