Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1994-04-19
1995-06-27
Kisliuk, Bruce M.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 5711, 173 29, 173216, 173217, B25B 1700
Patent
active
054270022
ABSTRACT:
A power drive unit for hand tools such as hand operated screwdrivers with a handle at one end, comprising a relatively large diameter cylindrical drive shaft having an annular chuck assembly secured at one end provides a relatively large diameter passageway therethrough. It is located on the upper wall of a casing having an electric motor and a battery therein, or a cord for connection to an external power source. A ring gear around the cylindrical drive shaft is rotated by a gear assembly powered by the electric motor to rotate the cylindrical drive shaft and chuck together with whatever tool is received therein. The location of the cylindrical drive shaft and annular chuck assembly provides a clear and unobstructed pathway both forwardly and rearwardly of the passageway therethrough. A hand operated screwdriver, for example has its working end inserted through the rearward facing end of the cylindrical passageway and out through the forward facing end to a desired working position. The opposite end of the screwdriver having a handle thereon extends rearwardly of the cylindrical drive shaft with enough clear and unobstructed space to utilize a hand operated screwdriver of any length. The chuck is then tightened down on the shank of the screwdriver. The motor is energized to drive the gear assembly and thus rotate the screwdriver. A lamp is also provided in the casing to illuminate the working area.
REFERENCES:
patent: 2525588 (1950-10-01), Cameron et al.
patent: 3724237 (1973-04-01), Wood
patent: 4945790 (1990-08-01), Golden
patent: 5083620 (1992-01-01), Fushiya et al.
patent: 5094133 (1992-03-01), Schreiber
patent: 5161437 (1992-10-01), Yasutomi et al.
patent: 5169225 (1992-12-01), Palm
patent: 5261135 (1993-11-01), Mitchell
Danganan Joni B.
Kettelson Ernest
Kisliuk Bruce M.
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