초록 ▼

There is disclosed a non-throttling, anti-leak, manually reciprocated, plunger pump for attachment to a consumer-type liquid dispensing container to provide drip-free dispensing of liquid therefrom. The pump has a hollow-stemmed skirted plunger which is reciprocable in a pump chamber to draw liquid

There is disclosed a non-throttling, anti-leak, manually reciprocated, plunger pump for attachment to a consumer-type liquid dispensing container to provide drip-free dispensing of liquid therefrom. The pump has a hollow-stemmed skirted plunger which is reciprocable in a pump chamber to draw liquid through an inlet into the chamber from a container, and to discharge it from the chamber to atmosphere through the hollow stem of the plunger. A check valve is positioned in the chamber inlet to allow liquid to enter but prevent its return flow. A differential force-actuated control element is nested in the plunger, for reciprocation therewith but having capability for axial movement independently thereof. The control element includes valve means for blocking discharge through the plunger stem and the valve is normally biased to blocking position. In addition the control element cooperates with a fitment or body insert at the inlet end of the pump chamber to provide telescopingly cooperating cylinder and piston members which are engaged throughout full reciprocal travel of the plunger and control valve. The fitment includes separate passages for venting the cylinder/piston combination to the interior of the container through an aperture in the wall of the pump housing, and for communicating the pump chamber with the fluid inlet and dip tube of the pump housing. The arrangement facilitates quick priming, and good maintenance of prime once established, of the pump.

대표청구항 ▼

In a manually reciprocable pump for dispensing containers; a housing forming a pump chamber and having provision for fluid intake at one end and discharge at the other, the chamber being open at the discharge end and closed at the intake end; a fluid inlet formed in the closed end, and an inlet valv

In a manually reciprocable pump for dispensing containers; a housing forming a pump chamber and having provision for fluid intake at one end and discharge at the other, the chamber being open at the discharge end and closed at the intake end; a fluid inlet formed in the closed end, and an inlet valve seat formed interiorly of said chamber about said inlet; check valve means coacting with said inlet seat permitting entry of fluid through said inlet into said pump chamber and preventing reverse flow therefrom; a plunger disposed in said pump chamber for reciprocation therein, said plunger having a skirted hollow head making a sliding piston fit with the wall of the chamber, said plunger including a hollow stem secured to said head and extending axially outwardly of the open end of said chamber to provide a discharge passage therefrom; a closure member at the open end of said housing, said closure member having a central aperture through which said plunger stem projects axially and which guides said stem during reciprocation, said closure member limiting outward movement of said plunger by abutment of its head against said closure member; a discharge outlet in said stem passage and a valve seat formed at the upstream side of said discharge outlet; a differential force actuated control element having a hollow body of lesser diameter than said plunger head and adapted to nest concentrically therewith at its downstream side, said element having a rod secured in it to project axially into said hollow plunger stem in radially spaced relation thereto, said rod having a valve member at its upper end which coacts with the valve seat in said plunger stem to close said discharge outlet; a compression spring interposed between the closed end of said pump chamber and said control element and biasing its valve member against said plunger valve seat, thereby simultaneously biasing said plunger towards fully extended position in abutment with said housing closure member, said control element moving with said plunger when the plunger stem is manually depressed against said compression spring but capable of independent axial movement relative thereto under influence of pumping pressure in the chamber; a fitment disposed adjacent said inlet at the closed end of said pump chamber, said fitment and said control element respectively supporting one member of a cylinder/piston combination arranged axially in telescoping relation within said pump chamber and adapted to maintain a piston/cylinder fit throughout full reciprocation of said pump plunger; a port in said pump housing wall adjacent said fitment and said fitment having a passage which communicates the interior of said cylinder/piston combination with said port, said fitment having a separate passage which communicates said pump chamber with said fluid inlet.