Plunger lock-up dispenser

Details Plunger lock-up dispenser Plunger lock-up dispenser

1996-05-31

1997-04-01

Derakshani, Philippe

Dispensing

With lock or fastening seal

Inhibiting actuation of discharge assistant

222384, B67D 533

Patent

active

056158068

ABSTRACT:
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.

REFERENCES:
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patent: 3500761 (1970-03-01), Clevenger et al.
patent: 3590691 (1971-07-01), Magers
patent: 3601290 (1971-08-01), Nigro
patent: 3608788 (1971-09-01), Tanaka
patent: 3724726 (1973-04-01), Susuki et al.
patent: 4155489 (1979-05-01), Steiman
patent: 4162746 (1979-07-01), Anderson et al.
patent: 4420096 (1983-12-01), Kirk, Jr.
patent: 4434916 (1984-03-01), Ruscitti et al.
patent: 4589574 (1986-05-01), Foster
patent: 4732549 (1988-03-01), Von Schuckman
patent: 4991746 (1991-02-01), Schultz
patent: 5335830 (1994-08-01), Cater

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