05942975 is referenced by 185 patents and cites 9 patents.

A method and device for sensing the distance between a first object and a second object so as to activate or facilitate predetermined actions when the distance has attained a certain value. A person (1) (first object) holds a handle (2) of a power tool, the handle being connected to a function generator (6) for a signal in turn connected to a unit (7) for encoding or modulating the signal. A capacitance (C1) exists between the hand of a person (1) and the handle (2). A capacitance (C2) exists between the person (1) and the active portion (4) (second object) of the tool connected to a demodulator or tone decoder (8) in turn connected to a control unit (9) incorporating the control circuitry. The control unit (9) controls the security system (10) in turn controlling the protective measures such as braking or power cut-off (11). The control unit (9) also controls an alarm and self-testing circuitry (11a).

Title
Method and a device for sensing the distance between a first object and a second object
Application Number
9/43669
Publication Number
5942975
Application Date
March 25, 1998
Publication Date
August 24, 1999
Inventor
J o slashed rn S o slashed rensen
Bakke Alle 1, 8230 .ANG.byh.o slashed.j
DK
IPC
G08B 13/26
View Original Source