Locking means for positive feed drill

Details Locking means for positive feed drill Locking means for positive feed drill

1977-05-23

1978-12-05

Simpson, Othell M.

Cutting by use of rotating axially moving tool

Means to drive tool

Including means to move tool along tool-axis

74813L, 74822, B23C 116, B23B 2932

Patent

active

041283619

ABSTRACT:
The improved locking means includes a pair of shaft mounted gears that are in mesh with the thread on the exterior of the feed screw mounted in the housing of a positive feed drill. On the opposite ends of the shafts are mounted gears which rotate with the shafts. When the drill tool holder is not to be advanced, the gears and shafts rotate as the feed screw is being rotated and thus do not cause axial movement of the feed screw as the feed screw rotates. A rack gear is located in the housing adjacent the spur gears. A pressure actuated piston is provided to move the rack gear into engagement with the spur gears to lock the spur gears and shafts against rotation. When this occurs, the gears in mesh with the thread on the feed screw act as a fulcrum so that the feed screw and tool holder are moved axially as the feed screw rotates.

REFERENCES:
patent: 3411385 (1968-11-01), Quackenbush
patent: 3762242 (1973-10-01), Swezey

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