Pump dispensers for containers

Claim 1

A pump dispenser suitable for attachment to the pouring opening of a hot or cold liquid container to dispense liquids from the container interior comprising: (a) an air chamber, (b) means for pumping air from said chamber through an opening therein into the container interior, said pumping means including a diaphragm and means for displacing said diaphragm, (c) valve means positioned in liquid sealing relation over said opening and operatively connected to said displacing means for displacement away from said opening only during pumping of air from said chamber into said container whereby said chamber is normally sealed against the entry of liquid from said container through said opening wherein said valve means includes: a valve stem disposed within said air chamber, one end thereof connected to said displacing means, a removable valve assembly which is adapted to be selectively extended through said opening into said air chamber to permit said assembly to be secured to the other end of said valve stem, said assembly when secured, except during pumping, being positioned in sealing relation over said opening, but when said assembly is not secured to said valve stem a venting path through said air chamber is provided to permit the storing of hot liquids.