Conveyor weighing scale

Claim 1

IN WEIGHTING APPARATUS FOR COMBINATION WITH AN INSTALLED BELT-TYPE CONVEYOR SYSTEM HAVING A CONVEYOR FRAME, THE IMPROVEMENT COMPRISING A PIVOTING FRAME AND PORT LEGS THROUGH WHICH WEIGHT IMPOSED ON THE IDLER BY MATERIAL CARRIED ON THE BELT IS TRANSMITTED TO THE CONVEYOR FRAME, THE IMPROVEMENT COMPRISING A PIVOTING FRAME AND MEANS TO CARRY THE PIVOTING FRAME FOR TRANSMITTING VARIABLE LOADING, THE FRAME HAVING A PIVOT AXIS EXTENDING GENERALLY TRANSVERSELY RELATIVE TO THE LENGTHWISE DIRECTION OF THE BELT, SAID AXIS BEING SPACED FROM SAID IDLER IN SAID DIRECTION, SAID PIVOTING FRAME HAVING A BRACKET PORTION LOCATED FOR CONNECTION TO THE IDLER SUPPORT LEGS IN SPACED RELATION TO THE BELT TO INDEPENDENTLY CARRY SAID LEGS AND THE IDLER WITH MATERIAL WEIGHT IMPOSED THEREON BY THE BELT WHEREBY THE PIVOTING FRAME IS FREE TO PIVOT WITH SAID IDLER IN RESPONSE TO VARIATIONS IN THE WEIGHT OF BELT TRANSPORTED MATERIAL IMPOSED ON THE IDLER, SAID PIVOTING FRAME HAVING STRETCHES EXTENDING AT OPPOSITE SIDES OF SAID AXIS IN SAID LENGTHWISE DIRECTION, A LOAD CELL AND MEANS SUPPORTING SAID CELL TO RECEIVE LOADING TRANSMITTED BY THE PIVOTING FRAME FOR DETECTING SAID WEIGHT VARIATIONS, SAID LOAD CELL COMPRISING A LIQUID CONTAINING CHAMBER HAVING A PLUNGER REMAINING PRESENTED TO RECEIVE LOADING IMPOSED BY ONE OF SAID STRETCHES. MOVEMENT OF THE PLUNGER IN RESPONSE TO LOADING VARIATIONS BEING COMMUNICATED BY SAID LIQUID AS PRESSURE VARIATIONS, STOP MEANS TO LIMIT PLUNGER ACTUATING MOVEMENT UNDER OVERLOAD CONDITIONS, AND INCLUDING CONVERTER MEANS TO DETECT SAID LIQUID PRESSURE VARIATIONS, SAID CELL HAVING DUCTING FORMING AT LEAST ONE RESTRICTION IN THE PATH OF LIQUID PRESSURE VARIATION COMMUNICATION TO SAID CONVERTER MEANS THEREBY TO DAMP SAID COMMUNICATION, SAID CONVERTER MEANS BEING CARRIED WITH SAID CHAMBER FOR SIMULTANEOUS BODILY MOVEMENT RELATIVE TO SAID ONE STRETCH, SAID CONVERTER MEANS COMPRISING A HOLLOW BODY AND DIAPHRAGM MEANS THEREIN DEFINING GAS AND LIQUID SUB-CHAMBERS RESPECTIVELY AT OPPOSITE SIDES OF THE DIAPHRAGM MEANS TO LIQUID SUB-CHAMBER COMMUNICATING WITH SAID LOAD CELL CHAMBER WHEREBY LIQUID PRESSURE VARIATIONS ARE COMMUNICATED TO ONE SIDE OF SAID DIAPHRAGM MEANS, MEANS FOR METERING GAS UNDER PRESSURE TO INCREASE AMD DECREASE GAS ADMISSION TO THE GAS SUB-CHAMBER IN RESPONSE TO OPPOSITE LOADING EXERTED ON THE DIAPHRAGM MEANS IN CORRESPONDENCE WITH LIQUID PRESSURE VARIATIONS WHEREBY A CHANGE IN LIQUID PRESSURE EXERTION ON SAID ONE SIDE OF THE DIAPHRAGM RESULTS IN A BALANCING CHANGE IN GAS PRESSURE EXERTION ON THE OPPOSITE SIDE OF THE DIAPHRAGM, AND MEANS TO MAINTAIN GAS FLOWING TO SAID METERING MEANS AND TO DETECT CHANGES IN THE GAS PRESSURE EXERTED AT THE DIAPHRAGM.