Adjustable jig for hole formation
OwnerHarry N. Christenseninventor
Life of this patent
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Abstract
An adjustable jig for hole formation including a base on which a swingable arm is mounted and carries a bushing for guiding a cutting tool through the bushing and onto a workpiece clamped onto the base. The base clamp portion positions the workpiece in a position relative to the operative position for the cutting tool bushing, and there are adjustments for controlling the positioning of the bushing in the operative position and for controlling the positioning of the workpiece relative to the base. The entire arrangement is such that accurate holes or openings can be formed in the workpiece.
Claims6
An adjustable jig for hole formation, comprising a base, a movable clamp on said base for fixedly holding a workpiece, a mounting member on said base, an arm swingably mounted on said mounting member for swinging movement to an operative position in the vertical plane above said workpiece and being sufficiently narrow and swingable about said mounting member to achieve an inoperative position clear of said vertical plane, a forming tool bushing on the swinging end of said arm and having a hole extending therethrough and with the hole having a longitudinal axis alignable with said workpiece when on said vertical plane for having said bushing guide a forming tool onto said workpiece in the operative position of said arm, an adjustable stop on said base and in the swinging path of said arm for abutting said arm to limit swinging movement of said arm toward the operative position of said arm, and means for releasably holding said arm in the operative position.
Dependencies are inferred from the claim text.