Shank retaining base for screwdriver

Details Shank retaining base for screwdriver Shank retaining base for screwdriver

2005-04-26

2005-04-26

Thomas, David B. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

C081S177400

Reexamination Certificate

active

06883406

ABSTRACT:
A shank retaining base for a screwdriver comprises a handle, a shank body, and a base mount wherein the handle has a receiving cavity disposed the center thereof for the base mount to be adapted therein, and the base mount has a polygonal sleeve hole and a round pivot hole disposed at both ends thereof for the shank body, a polygonal rod with tool heads of different sizes disposed at both ends thereof, to be sleeve joined therein. The base mount also includes a journal section with a roller bead embedded at the upper section and a flexible means covering the outer side thereof disposed at the middle section thereof. Via a circular guide facet and equidistant retaining ribs with oblique guide edges disposed at one side of the journal section thereof, the base mount is straightly guided and smoothly pushed with pressure to the receiving cavity therein, preventing the bottom side of the handle from getting cracked or broken up in assembly. The retaining ribs thereof are securely locked at the receiving cavity therein, refraining the base mount from spinning or coming off from the handle in case of relatively great torque applied onto the shank body. Finally, the roller bead and the flexible means adapted at the receiving cavity therein are protected from outside impact, facilitating the precise retaining of the shank body at the base mount thereof without spinning therein or coming off therefrom.

REFERENCES:
patent: 4779493 (1988-10-01), White
patent: 5335409 (1994-08-01), Elvebak
patent: 5533429 (1996-07-01), Kozak
patent: 5881614 (1999-03-01), Cheng-Tsan
patent: 6655240 (2003-12-01), DeVecchis et al.

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