Cutting by use of rotating axially moving tool – Machine including plural tools – Plural – simultaneously operational tools
Patent
1991-04-12
1993-04-27
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Machine including plural tools
Plural, simultaneously operational tools
408 53, 408 79, 408130, 408702, B23B 4514
Patent
active
052056821
ABSTRACT:
A hand-held automatic drilling machine includes an expandable locating collet or locating pin, a pair of adjustably mounted drill bits for simultaneously drilling a pair of spaced-apart openings in a workpiece and a rotary drive motor for the drill bits. The machine also includes a first drive assembly for activating the expandable collet and a second drive assembly for advancing the drill bits into the workpiece. An adjustable dashpot provides resistance to the second drive assembly, thereby controlling the force applied to the drill bits and thus the feed rate. A bi-stable control valve commences the drilling cycle in one state and sequentially activates the first drive assembly and the second drive assembly. A full depth sensor moves the control valve to the opposite state, sequentially deactivating the second drive assembly and the first drive assembly.
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Cooper Industries Inc.
Howell Daniel W.
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