Electromagnetic base drill with antifloating control means

Details Electromagnetic base drill with antifloating control means Electromagnetic base drill with antifloating control means

1991-01-23

1992-03-17

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 76, B23B 4724

Patent

active

050963392

ABSTRACT:
A drill apparatus with an electromagnet base, which has an electric drill directed downwards, is provided with an electromagnet base having an electromagnet for attaching the apparatus to a to-be-worked object by magnetic force. The electric drill is rotated by a drill motor and moved by a feed motor towards the object. A Hall element is situated on the electromagnet base. Two comparators detects whether or not a Hall voltage output from the Hall element falls in a predetermined range of voltage values. When the Hall voltage does not fall in this range, a transistor is turned on. Consequently, a relay is operated, a contact is opened, and power supply to the drill motor and the feed motor is stopped.

REFERENCES:
patent: 4278371 (1981-07-01), Meyer
patent: 4604006 (1986-08-01), Shoji et al.

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