Patent ID: 7614832

Claim:
A portable drill, comprising: a stationary portion adapted to be mounted in a fixed position relative to a workpiece in which a hole is to be drilled; a movable portion mounted on the stationary portion for linear movement between home and displaced positions respectively representing top-of-stroke and bottom-of-stroke drill positions, the movable portion including a mount, and a drill motor secured to the mount, said drill motor adapted to drive a countersink drill bit, said countersink drill bit adapted to drill and countersink a hole; and, a feed motor for displacing the movable portion between the home and displaced positions; wherein the feed motor includes at least one pneumatic cylinder carried on the movable portion and having an output drive shaft drivingly connected to the stationary portion; a drive system including an adjustable dwell control comprising a switch, said dwell control switch adapted to control the length of time said drill bit remains in the bottom-of-stroke drill position; said movement between said home and displaced position operable to cause said drill bit to drill and countersink a hole.