Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Work-gripping clamp
Patent
1977-10-07
1979-01-30
Spruill, Robert Louis
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Work-gripping clamp
144 69, 269 873, 408115R, B23B 4728, B23B 4900
Patent
active
041370031
ABSTRACT:
A drill jig for producing a rectangular mortise in the flat surface of a workpiece requiring only a portable drill and drill bit. The rectangular slot is intended to snugly house a standard square or hex nut so as to keep it from turning in either direction. The jig also permits production of a pilot hole perpendicular to the mortised slot for receiving the threaded end of a bolt for mating with the embedded nut. The drill jig in a preferred embodiment includes a pair of substantially identical drill guide members, an anvil plate, and a stationary support, all of which are movably disposed on a vertical support member. The workpiece is clamped between the lower drill guide plate and the anvil plate. Each of the drill guide plates includes a channel-shaped member having the desired slot templates formed therein, and a movable template disposed therewithin. The movable templates include a plurality of sets of circular guide holes which are aligned in a prescribed fashion with the template slots for drilling the desired rectangular mortise. Guide holes formed in the vertical support member are utilized to drill the perpendicular guide holes.
REFERENCES:
patent: 2268930 (1942-01-01), Edwards
patent: 3708237 (1973-01-01), Kruse
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