Variable feed pump and related method

Claim 1

IN A VARIABLE FEED PUMP COMPRISING A CASING, A MOTOR WITHIN SAID CASING, A SWITCH ON THE OUTSIDE OF SAID CASING AND COUPLED TO SAID MOTOR FOR SELECTIVELY ACTUATING THE SAME, A ROTOR ON THE OUTSIDE OF SAID CASING AND COUPLED TO SAID MOTOR TO BE DRIVEN BY THE LATTER; SAID ROTOR INCLUDING A SHAFT DEFINING AN AXIS OF ROTATION AND COUPLED TO SAID MOTOR, A LEVER PERPENDICULAR TO AND FIXED ON SAID SHAFT, PINS ON SAID LEVER AT OPPOSITE EXTREMITIES THEREOF AND AT EQUAL DISTANCES FROM SAID AXIS, COPLANAR ROLLERS OF EQUAL DIAMETER ROTATABLE ON SAID PINS, SAID ROLLERS, WITH SAID SHAFT ROTATING, DESCRIBING A CIRCLE ABOUT SAID AXIS, SAID CIRCLE HAVING A RADIUS EQUAL TO THE DISTANCE BETWEEN SAID AXIS AND THE PORTION OF EACH SAID ROLLER MOST REMOTE FROM SAID AXIS, A SUPPORT INCLUDING A SEMI-CIRCULAR SECTION AND TWO RECTILINEAR SECTIONS EXTENDING IN PARALLEL FROM THE EXTREMITIES OF SAID SEMI-CIRCULAR SECTION, SAID SEMI-CIRCULAR SECTION BEING PROVIDED WITH AN INWARDLY OPENING GROOVE FACING SAID SHAFT AND CONCENTRIC WITH SAID AXIS AND HAVING A RADIUS GREATER THAN THE FIRST SAID RADIUS, SAID RECTILINEAR SECTIONS DEFINING FACING GROOVES CONSTITUTING EXTENSIONS OF THE FIRST SAID GROOVE AND CONSTITUTING THEREWITH A RECEPTACLE OF GENERALLY ARCUATE CROSS-SECTION, AND A FLEXIBLE TUBE POSITIONED IN SAID RECEPTACLE AND OF A NORMALLY CIRCULAR CROSS-SECTION HAVING A DIAMETER GREATER THAN THE DIFFERENCE BETWEEN SAID RADII WHEREBY SAID ROLLERS ARE ADAPTED FOR LOCALLY AND PROGRESSIVELY COMPRESSING THE SAID TUBE, THE IMPROVEMENT CONSISTING OF A THREADED POST BETWEEN SAID RECTILINEAR SECTIONS, A PLATE SLIDABLY DISPLACEABLE ON SAID POST AND INCLUDING TWO EXTENSIONS ADAPTED FOR COMPRESSING SAID TUBE IN SAID RECTILINEAR SECTIONS TO THROTTLE LIQUID FLOW INTO AND OUT OF SAID TUBE, THE LATTER SAID EXTENSIONS INCLUDING GENERALLY TRIANGULAR EXTREMITIES FOR ENGAGING SAID TUBE, AND A KNOB ADJUSTABLE ON SAID POST AND ADAPTED FOR CONTROLLABLY DISPLACING SAID PLATE AND TRIANGULAR EXTREMITIES TOWARDS SAID TUBE.