초록 ▼

A pump dispenser has a plunger lock-up feature in which the plunger is positively retained against dislodgement by cradling projections on the piston stem against abutment shoulders of a locking sleeve which is fixed within the pump body of the dispenser. The pump body may be of an integral one-piec

A pump dispenser has a plunger lock-up feature in which the plunger is positively retained against dislodgement by cradling projections on the piston stem against abutment shoulders of a locking sleeve which is fixed within the pump body of the dispenser. The pump body may be of an integral one-piece construction with the container closure, and the container vent opening is controlled by an upstanding sleeve on the piston cup for preserving the integrity of the piston seals.

대표청구항 ▼

A liquid pump dispenser comprising, a pump body including a container closure, a locking sleeve fixedly mounted in said pump body, a manually actuated pump plunger having a discharge spout rotatable in opposite directions about a central axis thereof and extending through coaxial openings in said cl

A liquid pump dispenser comprising, a pump body including a container closure, a locking sleeve fixedly mounted in said pump body, a manually actuated pump plunger having a discharge spout rotatable in opposite directions about a central axis thereof and extending through coaxial openings in said closure and sleeve and being disposed for reciprocation between lowered and spring biased raised positions, said locking sleeve having at least one edge wall lying in a plane perpendicular to said axis, at least one upstanding limit stop at one end of said wall, and at least one longitudinal groove at an opposite end of said wall, a detent on said wall adjacent said groove, said wall between said detent and said stop defining an abutment shoulder, said plunger having at least one radially extending projection in engagement with said shoulder in one rotative position of said plunger about said axis to lock said plunger in said raised position, as said projection is in a cradled position between said detent and said limit stop for positively retaining said plunger in said one rotative position, said projection sliding along said detent and being placed into alignment with said groove upon rotation of said plunger about said axis to another rotative position opposite said one position to unlock said plunger for reciprocation.