Drilling device

Details Drilling device Drilling device

1990-07-10

1991-11-05

Bishop, Steven C.

Cutting by use of rotating axially moving tool

With randomly-actuated stopping means

Responsive to condition of tool or tool-drive

408 11, 408 14, 408 16, 408 76, 408135, B23B 4724, B23B 4514

Patent

active

050627430

ABSTRACT:
In a drilling device, a holder is provided that is displaceable with respect to a foot in a feed direction. A drilling machine tool is carried by the holder. An electromotor provides a feed drive for driving the holder in the feed direction. The drilling machine tool and/or the holder are displaceable relative to the feed drive in an opposite direction to the feed direction by overcoming a counterforce. A switching element monitors the relative displacement and enables a signal to be derived for stopping the feed drive if a predetermined value of counterforce is exceeded. Motor current is limited to a predetermined maximum value during operation of the device.

REFERENCES:
patent: 3008155 (1961-11-01), Tsuda
patent: 3456738 (1969-07-01), Harry
patent: 3968705 (1976-07-01), Amano et al.
patent: 3989405 (1976-11-01), Quackenbush
patent: 4604006 (1986-08-01), Shoji et al.

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