Dispenser

Claim 1

IN A FLUID DISPENSING DEVICE HAVING A PUMP CYLINDER, AND A PISTON AXIALLY RECIPROCABLY CONTAINED IN SAID CYLINDER, APPARATUS FOR IMPARTING A POSITIVE RECIPROCATION CYCLE TO SAID PISTON RELATIVE TO SAID CYLINDER IN RESPONSE TO A SINGLE POWER IMPULSE APPLIED THERETO, COMPRISING: A LEVER ROCKABLY SUPPORTED AT A POINT INTERMEDIATE ITS OPPOSITE ENDS, SAID LEVER BEING COUPLED ADJACENT ONE END TO SAID PISTON AND CARRYING ADJACENT THE OTHER END A CAM FOLLOWER; A CAM HEAD PIVOTALLY SUPPORTED ON A CAM PIVOT FOR PIVOTAL MOVEMENT THROUGH A PREDETERMINED LIMITED ANGLE, SAID CAM HEAD HAVING A CONTINUOUS CAM SURFACE HAVING INNER AND OUTER RADIALLY OPPOSITELY POSITIONED SECTIONS, A FIRST OF SUCH SECTIONS HAVING A CIRCULAR CURVATURE SUBSTANTIALLY CONCENTRIC WITH SAID CAM PIVOT, AND THE SECOND OF SUCH SECTIONS HAVING A CURVATURE, AT LEAST A PORTION OF WHICH HAS A RADIUS SUBSTANTIALLY LESS THAN, AND ECCENTRIC TO THAT OF SAID FIRST OF SUCH SECTIONS; MEANS CARRIED BY SAID CAM HEAD FOR RESTRAINING SAID CAM FOLLOWER SUBSTANTIALLY TO CONTINUOUS FOLLOWING TRAVEL IN ONE DIRECTION AROUND SAID CONTINUOUS CAM SURFACE FROM AND RETURN TO A GIVEN POINT THEREON, SAID TRAVEL BEING FIRST ALONG SAID SECOND ONE OF SAID SECTIONS AS SAID CAM HEAD IS PIVOTED FROM AN INITIAL POSITION FORWARD THROUGH SAID PREDETERMINED ANGLE AND SECOND ALONG SAID FIRST ONE OF SAID SECTIONS BACK TO SAID GIVEN POINT THEREON AS SAID CAM HEAD IS PIVOTED BACK THROUGH SAID PREDETERMINED ANGLE TO SAID INITIAL POSITION, THEREBY IMPARTING ONE COMPLETE ROCKING MOVEMENT CYCLE TO SAID LEVER IN RESPONSE TO SAID FORWARD PIVOTAL MOVEMENT OF SAID HEAD FROM SAID INITIAL POSITION THROUGH SAID PREDETERMINED ANGLE, AND IMPARTING NO ROCKING MOVEMENT TO SAID LEVER IN RESPONSE TO PIVOTAL MOVEMENT OF SAID HEAD BACK THROUGH SAID PREDETERMINED ANGLE TO SAID INITIAL POSITION; POWER MEANS COUPLED TO SAID CAM HEAD AND ENERGIZABLE FOR POSITIVELY IMPARTING PIVOTAL MOVEMENT OF SAID CAM HEAD FORWARD AND BACK THROUGH SAID PREDETERMINED ANGLE; AND CONTROL MEANS ACTUATABLE FOR INTERMITTENTLY ENERGIZING SAID POWER MEANS.