Method of and apparatus for preventing accidents during working

Details Method of and apparatus for preventing accidents during working Method of and apparatus for preventing accidents during working

1999-12-01

2000-08-29

Wu, Daniel J

Communications: electrical

Condition responsive indicating system

Specific condition

340679, 3406865, 340689, 408 6, 173 12, G08B 2100

Patent

active

061115150

ABSTRACT:
A method of and an apparatus for preventing accidents caused by blockage of a rotatable tool when working with a hand-held tool including the rotatable tool (8), a drive motor (7) for driving the rotatable tool (8), and means (5, 6) for interrupting transmission of a drive torque from the drive motor (7) to the rotatable tool (8) dependent on an operational condition of the hand-held tool, with the method including determining the operational condition of the hand-held tool by measuring displacement of the hand-held tool in space in at least two points of the hand-held tool spatially spaced from each other and spaced from a tool axis; subtracting two obtained displacement measurement variable (a.sub.1, a.sub.2) from each other; and thereafter, calculating an actuation signal that actuates the interrupting means (5, 6); and with the apparatus including sensors and an evaluation circuit for implementing the method.

REFERENCES:
patent: 4063600 (1977-12-01), Krzes
patent: 4866429 (1989-09-01), Granere
patent: 5014793 (1991-05-01), Germanton et al.
patent: 5235472 (1993-08-01), Smith
patent: 5239479 (1993-08-01), Nolting et al.
patent: 5401124 (1995-03-01), Hettich
patent: 5954457 (1999-09-01), Stock et al.

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