Tool-level indicator structure

Claim 1

A tool structure comprising, in combination: a drill operable along a line of action, said line of action being variable to any one of various positions relative to a given planar reference; a level indicator means including a bubble level for indicating the line of action of said tool relative to said planar reference; and position adjustment means for varying the relative position of said level indicator means relative to said drill, the position adjustment means including a first arm and a second arm, the level indicator means being engaged to said first arm about one terminal end of said first arm, said first arm being interconnected about the other terminal end with said second arm about a first pivot having an axis perpendicular to the line of action of the tool, said first arm being adapted to be pivoted about said axis of said first pivot, first means for determining the relative position of said first arm about said first pivot said second arm being interconnected with said first arm about the axis of said first pivot and with the drill about a second pivot point, said second pivot having an axis perpendicular to the line of action of the tool and perpendicular to the axis of said first pivot, said second arm being adapted to be pivoted about said second pivot second means for determining the relative position of said second arm about said second pivot.