Patent ID: 7878740

Claim:
A drill guide jig for guiding a drill orthogonally to a single curved surface of a workpiece or to a workpiece having a compound curved surface composed of a plurality of radii, when a hole is formed in said surface using a hand drill apparatus, which comprises: a guide member having a guide hole for guiding the drill; and a holding member for holding the guide member, the holding member being designed to allow grasp by a worker and having contact parts for contacting the curved surface, wherein when the workpiece has a single curved surface the contact parts include left and right contact points for contacting the curved surface, and the guide hole is disposed along a center axis orthogonal to a midpoint of a line segment that connects the two contact points, and when the workpiece has a compound curved surface composed of said plurality of radii, the contact parts comprise a plurality of right contact points and a plurality of left contact points that correspond to the radii of curvature and the guide hole is disposed along a center axis orthogonal to a midpoint of a line segment that connects the plurality of right contact points and the plurality of left contact points that correspond to the plurality of radii of curvature.