Liquid level gauge

Claim 1

A liquid level gauge for supervising the level of high viscosity ink, said level gauge comprising: including a movable probe, intermittently activated drive means for positively imparting to said probe uniform repetitive swinging motions to an activated position, and return to a rest position, and switch means alternately opened and closed in synchronism with said motions of the probe, opening and closing of said switch means causing generation of corresponding repetitive pulses; and alarm means, circuit means connecting said switch means to said alarm means, for controlling said alarm means in response to said pulses, said probe being arranged to dip into the liquid when the level thereof exceeds a predetermined height thereby causing a change in the motions of the probe, said change in turn causing a change in the gneration of the pulses, said change being utilized by said circuit means to activate the alarm means when and while said change in the pulses persists, said probe comprising a pendulum pivotally supported near one end, another end of the pendulum dipping into the liquid when the level thereof exceeds said predetermined height, the motions imparted to the pendulum causing the same to swing from an initial rest position to a predetermined angularly deflected position and to return to its initial position at the end of each motion, dipping of said other end of the pendulum into the liquid varying said pendulum motions, and said switch means being operated by said pendulum motions so as to cause the generation of said pulses in conformity with the variations of the pendulum motions.