Patent ID: 7762749
Filing Date: 2010-07-27
Classification: B23B,Y10T

Abstract:
1. A self centering drilling jig comprising: a) a frame having a pair of mirror image opposed U-shaped channels, an upper channel and a lower channel, which channels define a spaced pair of parallel tracks, and a bar spaced away from said upper arm; b) a single cross having two crossed arms, each arm having two ends, the respective ends of said crossed arms each sliding within the confines of one of the two channels, and movable along said channels between an inward position wherein the ends of one arm are closer to the ends of the other arm, and an outward position wherein the ends of the one arm are further apart from the ends of the other arm, the positioning of the two arms being dependent on the spacing between the two channels; c) a spring means connected to said cross to urge said cross into the outward position; d) threaded means disposed in said bar and impacting said upper channel for biasing said channels toward each other in opposition to said spring means, to thereby position the ends of said arms in a desired location; e) a single locator pin mounted near each end of each of said arms, and disposed outwardly from one side of said cross, each pin being equidistant from the center of said cross, and being adapted to retain the upper and lower faces of an elongated object to be drilled, between the four locator pins.