Dispensing – With discharge assistant – With movable nozzle interconnected therewith
Reexamination Certificate
2000-03-13
2001-06-26
Shaver, Kevin (Department: 3754)
Dispensing
With discharge assistant
With movable nozzle interconnected therewith
C222S385000
Reexamination Certificate
active
06250510
ABSTRACT:
FIELD OF THE INVENTION
This inventionl relates to a pump dispenser. More specifically, this invention relates to a pump dispenser in which a plunger reciprocates inside a hollow cylindrical body. The plunger includes a piston and an upward actuator defining a discharge spout.
BACKGROUND OF THE INVENTION
The U.S. Pat. 3,062,416 to Cooprider, issued Nov. 6, 1962, discloses a liquid dispenser comprising a hollow body and a one-piece plunger including an actuator/piston. The piston has an enlarged head at its lower end inside the hollow body. Inlet and outlet check valves are provided and a spring urges the plunger upward.
In assembly, after the Cooprider plunger is installed in the body, a tool is brought down against the upper end of the body. The lower end of the tool is so shaped as to cause the plastic of the body to be swaged inwardly thus providing a blocking flange to trap the plunger in the body.
SUMMARY OF THE INVENTION
The present invention is a pump dispenser and a method for making it. The dispenser comprises a hollow body having molded about the inside of its mouth an inward and downward annular flap. A dispenser plunger, which is biased upward by a spring, operates in the body and is held in by the flap.
The method involves the molding of the body with the flap extending inward and upward. A tool is inserted into the open end of the body so that it engages the flap and folds the flap to the inward and downward position. With the flap thus folded and the tool removed, the plunger is inserted into the body, engaging the flap and moving downward. The plunger is reduced in diameter above the lower end to define an annular upwardly facing shoulder. Once the shoulder has passed the flap, the flap, directed downwardly, forms an obstacle to the removal, accidental or otherwise, of the plunger. Thus, the plunger is retained in the body.
The molding of the flap and the step of folding it down makes unnecessary the swaging step to shape a blocking flange as disclosed, for instance, in the Cooprider patent.
The invention also includes plunger lock-down means comprising an outward pin on the actuator portion of the plunger and a bayonet slot in the upper wall of the cylinder body adapted to receive the pin and, after a turn of the plunger, hold the plunger down against the upward force of the spring.
REFERENCES:
patent: 3062416 (1962-11-01), Cooprider
patent: 3084873 (1963-04-01), Corsette
patent: 3128018 (1964-04-01), Corsette et al.
patent: 3179306 (1965-04-01), Corsette
patent: 3248021 (1966-04-01), Corsette
patent: 3359917 (1967-12-01), Cooprider
patent: 3362344 (1968-01-01), Duda
patent: 3578203 (1971-05-01), Mainet
patent: 3759426 (1973-09-01), Kane et al.
patent: 1288917 (1969-02-01), None
patent: 957036 A1 (1999-11-01), None
Durliat Leonora M.
Graham Paul R.
Buechner Patrick
Owens-Illinois Closure Inc.
Shaver Kevin
LandOfFree
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