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US 5,807,033 AGranted
Drilling jig
OwnerRandy E. Benwayinventor
Life of this patent
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OwnerRandy E. Benwayinventor
Estimating the term…
The present invention is an improved loose tenon joint with multiple arculate mortise surfaces and similarly configured loose tenon member for woodworking applications. A jig is provided arranged to be secured to a workpiece where the jig axially guides a drill bit for boring a series of adjoining holes forming a mortise. The first jig embodiment manipulates a slidable guide bar maintaining longitudinally spaced drill guide holes and two index holes. A hand held drill is used to bore a series of holes (fixtured by the drill guide holes) into the workpiece. A second series of holes are bored (completing the mortise) after the drill guide is translated and secured to the second index hole. A second embodiment is provided including a stationary jig body arranged to be secured to a workpiece. An elongated opening in the jig body supports a drill guide with longitudinally spaced drill guide holes. A hand held drill is used to bore a series of holes (fixtured by the drill guide holes) into the workpiece. The first drill guide is replaced by a second drill guide with preset hole spacing where a second series of holes are bored, completing the mortise. Both embodiments provide multiple guide holes for fast drilling with full drill bit contact area and preset hole spacing to produce a uniform and accurate mortise for a strong loose tenon joint system.
A method of providing a loose tenon fastening system for joining a pair of abutting members, said method comprising forming a mortise in each of said members by drilling a series of equally spaced bores lying in a longitudinal plane and, being spaced to provide a series of arc-shaped, undulating, oppositely disposed mortise surfaces, forming a loose, independent tenon member having opposite surfaces configured substantially identical to the undulating surfaces of said mortises, inserting a portion of said tenon in a respective mortise and securing said tenon and mortise together.
A drilling jig comprising a stationary body having at least one upstanding sidewall including an indexing aperture, a drill guide structure arranged for sidable engagement with respect to said stationary body, said drill guide structure including a thru-bore for receiving and axially guiding a drill bit, a series of longitudinally spaced indexing holes disposed in said guide structure and lying in a longitudinal plane angularly relative to the axis of said thru-bore, and a removable indexing pin arranged for insertion and withdrawl into and out of respective indexing holes in said guide structure and said indexing aperture in said stationary supporting body.
Dependencies are inferred from the claim text.