Control provision for weighing systems

Claim 1

MEANS FOR USE IN COMBINATION WITH A WEIGHING SCALE DIAL UNIT HAVING AN INDEX DIAL, A TRANSPARENT FRONT PLATE SPACED FROM THE INDEX DIAL AND AN INDICATING HAND BETWEEN THE INDEX DIAL AND FRONT PLATE MOVABLE RELATIVE TO THE INDEX DIAL, PROVIDED FOR CAUSING OPERATION OF PNEUMATIC RELAY MEANS WHEN SAID HAND REACHES A PREDETERMINED POSITION RELATIVE TO SAID INDEX DIAL, COMPRISING (A) SUPPORT MEANS ON SAID FRONT PLATE IN AXIAL ALIGNMENT WITH THE AXIS OF SAID HAND, (B) AN ARM ROTATABLE ON SAID SUPPORT MEANS AND EXTENDING RADIALLY BETWEEN SAID FRONT PLATE AND INDEX DIAL, (C) A PAIR OF AXIALLY ALIGNED AND SPACED APART NOZZLES CARRIED BY SAID ARM, (D) MEANS FOR SUPPLYING LOW PRESSURE AIR TO ONE OF SAID NOZZLES FOR NORMALLY MAINTAINING AN AIR STREAM THEREFROM INTO THE OTHER NOZZLE, (E) AND AN INTERCEPTOR ELEMENT ON SAID HAND POSITIONED THEREON FOR ENTRANCE BETWEEN SAID NOZZLES TO INTERCEPT SAID AIR STREAM WHEN THE HAND APPROACHES THE NOZZLES.