Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Patent
1997-06-17
1999-04-13
Scherbel, David A.
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
74144, 81 584, 81490, B25B 1300
Patent
active
058933050
ABSTRACT:
An improved pistol gripped semi-automatic manually operated screwdriver is provided which provides advantages over conventional semi-automatic pistol gripped screwdrivers. The prior art screwdrivers are generally in the form of a pistol having a handle and a trigger. The trigger is squeezed to activate a sliding rotation actuator mounted on a helically grooved shaft. Pulling the trigger causes the actuator to move along the shaft thereby creating rotation of the shaft as well as a collet or chuck which holds the screwdriver bit. Such prior art devices also include a coiled spring which is adapted to provide a recoil mechanism for the actuator. In the improved device of this invention the screwdriver further includes a ball bearing located in a cup attached to the top of the actuator and a slide slot located within the housing for rolling engagement with a portion of the ball bearing which protrudes into the slot. This arrangement provides improved positioning of the sliding rotation actuator and additionally improves the slidability and stability of the actuator. In addition the improvement of this invention provides a torsion spring attached to the trigger and the handle for recoiling the trigger after the trigger has been pulled. The housing also includes at least one inwardly projecting receptacle for holding screwdriver bits on the outside of the housing so that a selection of screwdriver bits having different types of heads can be easily accessed.
REFERENCES:
patent: 5174178 (1992-12-01), Disston, Jr.
Halpern Benjamin M.
Scherbel David A.
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