Protective tunable circuit for electro-mechanical equipment

Details Protective tunable circuit for electro-mechanical equipment Protective tunable circuit for electro-mechanical equipment

G - Physics

05

B

G05B 9/02 (2006.01) B23D 59/00 (2006.01) F16P 3/14 (2006.01) G08B 13/26 (2006.01)

Patent

CA 2125869

A circuit for controlling and stopping the motion of dangerous moving parts is disclosed. The circuit includes an antenna (16) connected to a moving part (18) and coupled to a tunable circuit (10) for controlling a safety equipment (32). The antenna (16) provides a variable lumped capacitance parameter within the tunable circuit (10). This lumped capacitance parameter is variable in response to an operator's body capacitance produced when the operator comes within a predetermined critical proximity to the moving part (18). This variation in lumped capacitance serves to tune the circuit (10) at or near a point of resonance to thereby enable an RF signal to pass through the tunable circuit (10) at a detectable level which is subsequently processed to activate the safety equipment (32) for controlling and stopping the motion of the moving part (18) substantially instantaneously.

Cette invention concerne un circuit de surveillance et de freinage de pièces mobiles dangereuses. Le circuit comprend une antenne (16) montée sur une pièce mobile (18) et couplée à un circuit accordable (10) servant à commander un accessoire de sécurité (32). L'antenne (16) envoie au circuit accordable (10) un signal variable de capacité localisée. La capacité localisée varie en fonction de la capacité du corps de l'opérateur lorsque celui-ci se rapproche à une distance critique prédéterminée de la pièce mobile (18). La variation de la capacité localisée sert à accorder le circuit sur la valeur exacte ou approchée de résonnance pour permettre à un signal HF d'intensité mesurable de le traverser et d'activer l'accessoire de sécurité (32) conçu pour immobiliser quasi instantanément la pièce mobile (18).

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