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A fluid dispensing pump includes a pump plunger mounted for reciprocation in a pump cylinder, the plunger having a discharge passage extending therethrough and communicating with a discharge opening in a discharge head connected with the plunger which sealingly engages a retaining collar on a contai

A fluid dispensing pump includes a pump plunger mounted for reciprocation in a pump cylinder, the plunger having a discharge passage extending therethrough and communicating with a discharge opening in a discharge head connected with the plunger which sealingly engages a retaining collar on a container closure during a lock-down position of the discharge head. A check valve in the discharge passage includes a cage surrounding a valve opening, and a lower end of the plunger sealingly engages a portion of the cage when in the lock-down position. The piston is arranged on the plunger to form an air space so as to prevent any hydraulic lock which would interfere with a full depression of the head into its lock-down position. The sealed locking engagement between the head and the retaining collar is capable of being unlocked by the provision of axially oriented unlocking cam faces for effecting disengagement upon relative rotation between the head and the collar.

대표청구항 ▼

A fluid dispensing pump comprising, a pump cylinder having a collar at one end, a plunger reciprocably disposed in said cylinder and having a discharge head at one end outwardly of said collar, said head having a fluid discharge opening, said plunger having a discharge passage extending therethrough

A fluid dispensing pump comprising, a pump cylinder having a collar at one end, a plunger reciprocably disposed in said cylinder and having a discharge head at one end outwardly of said collar, said head having a fluid discharge opening, said plunger having a discharge passage extending therethrough and communicating with said opening, check valve means in said cylinder to only permit movement of fluid from an inlet into said cylinder, means acting between said head and said collar for locking said head in a depressed and immobilized position, said valve means including a check valve and a cage surrounding said valve, means on said plunger sealingly engaging a portion of said cage when said head is locked in said depressed and immobilized position, and said cage having an intake port therein disposed outwardly of said engaging means, whereby flow of fluid beyond said engaging means into said discharge passage is prevented with said plunger head in said depressed and locked position.