초록 ▼

A manually operated reciprocating liquid pump of the type comprising a plunger that reciprocates vertically in a pump chamber to dispense liquid from a container to which the pump is attached includes a vent opening to vent air to the interior of the container as liquid is drawn from the container b

A manually operated reciprocating liquid pump of the type comprising a plunger that reciprocates vertically in a pump chamber to dispense liquid from a container to which the pump is attached includes a vent opening to vent air to the interior of the container as liquid is drawn from the container by the pump. The pump plunger locks in its vertically downward position in the pump chamber and is provided with a stopper that plugs the vent opening and prevents liquid in the container from passing through the vent opening when the plunger is in its locked position.

대표청구항 ▼

[ What is claimed:] [8.] A manually operable reciprocating liquid pump comprising:a pump housing containing a pump chamber;a pump element mounted on the pump housing for reciprocating movement between charge and discharge positions of the pump element relative to the pump housing;a vent opening in t

[ What is claimed:] [8.] A manually operable reciprocating liquid pump comprising:a pump housing containing a pump chamber;a pump element mounted on the pump housing for reciprocating movement between charge and discharge positions of the pump element relative to the pump housing;a vent opening in the pump housing;a stopper mounted on the pump housing for movement of the stopper between an open position where the stopper is displaced from the vent opening and a closed position where the stopper closes the vent opening in response to the pump element moving between its charge and discharge positions, respectively;the pump housing has a pump opening to the pump chamber that is separate from the vent opening;the pump element is a piston mounted in the pump chamber for reciprocating movement between charge and discharge positions of the piston in the pump chamber; anda tubular pump plunger is connected to the piston for movement of the pump plunger with the piston between its charge and discharge positions, the pump plunger extends through the pump opening and out of the pump housing and has a hollow interior bore that communicates with the pump chamber, and a dispensing head is mounted on the plunger opposite its connection to the piston.