Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1991-07-12
1992-05-05
Kisliuk, Bruce M.
Tools
Wrench, screwdriver, or driver therefor
Machine
81432, B25B 2304
Patent
active
051097389
ABSTRACT:
A handheld screw driving gun (1) has a handle (17) extending essentially perpendicularly relative to the motor axis (3--3) and a screwing axis (6--6) which is off-set below the motor axis. The handle is connected approximately at the center of gravity of the screw gun (1). A screwing bit (5) is also off-set from the motor axis (3--3) and is rotatably supported in a guide head (7) between the motor axis (3--3) and the handle (17). In this arrangement, the index finger of an operator's hand on the handle approximately aligns with the axis of the screwing bit (5) so as to assure a screwing direction perpendicularly to a work surface without applying any tilting forces to a screw. The arrangement of the drive motor behind the handle and the screwing unit in front of the handle provides a balance that reduces fatigue while holding and operating the screw gun with one hand.
REFERENCES:
patent: 2943652 (1960-07-01), Chilton
patent: 4581964 (1986-04-01), Takatsoru
patent: 4625597 (1986-12-01), Cast
patent: 4807498 (1989-02-01), Kleiser et al.
Farian Gerhard
Haas Guenter
Cruz Lawrence
Fasse W. G.
Karl M. Reich Maschinenfabrik GmbH
Kisliuk Bruce M.
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