Reciprocating pump type dispenser

Claim 1

A RECIPROCATING PUMP TYPE DISPENSER COMPRISING: A PUMP CYLINDER OPEN AT ITS UPPER END AND HAVING A VALVE CONTROLLED INLET PORT AT ITS LOWER END, A PLUNGER DISPOSED FOR RECIPROCATION IN SAID CYLINDER, SAID PLUMBER HAVING A PISTON IS SNUG SLIDING ENGAGEMENT WITH THE INTERIOR OF SAID CYLINDER ADJACENT ITS LOWER END, THE UPPER END OF SAID PLUNGER PROJECTING UPWARDLY THROUGH THE OPEN UPPER END OF SAID CYLINDER FOR MANUAL ACTUATION, SAID PLUNGER HAVING A PORTION WITHIN THE CYLINDER OF SMALLER CROSS SECTIONAL DIMENSION THAT THE SURROUNDING PORTION OF SAID CYLINDER, A DISPENSING HEAD CARRIED AT THE UPPER END OF SAID PLUNGER FOR RECIPROCATION THEREWITH ABOVE AND EXTERNALLY OF THE CYLINDER, SAID PISTON, PLUNGER AND ISPENSING HEAD BEING PROVIDED WITH A VALVE DISCHARGE PASSAGE THERETHROUGH COMMUNICATING THROUGH SAID PUMP CYLINDER WITH THE INLET PORT, A DEPENDING SKIRT CARRIED BY SAID HEAD AND TELESCOPICALLY RECEIVED IN THE UPPER END OF SAID CYLINDER TO DEFINE A LIQUID TIGHT EXTENSIBLE SPRING HOUSING ABOVE SAID PISTON AND AROUND SAID PLUNGER PORTION, SAID PLUNGER AND SAID CYLINDER BEING PROVIDED RESPECTIVELY WITH LONGITUDINALLY OPPOSED SPRING SEATS AT OPPOSITE ENDS OF SAID HOUSING, A SPRING ENCIRCLING SAID PLUNGER PORTION WITHIN SAID HOUSING AND RESILIENTLY COMPRESSED BETWEEN SAID SPRING SEATS, SAID SPRING AND SAID HOUSING EXTENDING UPWARDLY SUBSTANTIALLY ABOVE THE UPPER END OF SAID CYLINDER AND STOP MEANS CARRIED BY SAID CYLINDER AND BY SAID SKIRT RESPECTIVELY FOR LIMITING THE UPWARD MOVEMENT OF THE PLUNGER BY SAID SPRING.