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Semi-automatic-pistolled-screwdriver-with-thorny-rings

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Semi-automatic pistolled screwdriver with thorny rings

Details

Inventors: Liao, Yung-chuan;
Assignee:
Primary Examiner: Scherbel; David A.
Assistant Examiner: Halpern; Benjamin M.
Attorney, Agent or Firm: Bacon & Thomas

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.

DETAILED DESCRIPTION It is an objective of the present invention to improve the above-noted deficiencies of the prior art pistol-gripped semi-automatic screwdrivers.
This objective as well as others are provided by an improved spring loaded trigger and sliding rotation actuator as well as the further inclusion of a receptacle for holding screwdriver bits on the outside of the tool.
The improved sliding rotation actuator includes a ball bearing located in a bearing cup or holder located on the top of the actuator and a sliding slot located inside the top of the pistol body so that the bearing rolls in the slot when the sliding rotation actuator moves forward or backward.
This arrangement provides perfect positioning of the sliding rotation actuator and additionally improves the slide and stability of the actuator.
In addition two springs are provided which cooperate with each other to improve the recoil action of the trigger and sliding rotation actuator and to improve the life of the mechanism.

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