Cutting by use of rotating axially moving tool – With control means energized in response to activator... – To control tool rotation
Patent
1985-12-13
1987-03-10
Briggs, William R.
Cutting by use of rotating axially moving tool
With control means energized in response to activator...
To control tool rotation
91184, 173 18, 408 12, B23B 4504
Patent
active
046487565
ABSTRACT:
An automatic shift drill for rotationally driving a bit into a laminated workpiece at one of two speeds according to the depth of the bit in the workpiece is disclosed. A cam block element has flag sections and gap sections corresponding to the various layers of the workpiece. The cam block element is mounted on a spindle of the drill to move in translation with the bit. A vent element has an orifice which is adapted to be closed when it is adjacent to one of the flag sections and open when it is adjacent to one of the gap sections. Shifting means responsive to pneumatic pressurization changes the rotational speed of the bit from one speed to the other speed. The orifice vents the shifting means when it is adjacent to a gap section to drive the bit at the appropriate speed through the corresponding layer and seals the shifting means when it is adjacent to a flag section to drive the bit at the other speed appropriate for the layer corresponding to the flag section.
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Alexander Robert H.
Falter Ronald C.
Lawson John R.
Allen-Bradley Company Inc.
Briggs William R.
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