US 4,339,046 AGranted

Nursing bottle

OwnerRobert Coeninventor

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Abstract

A nursing bottle unit includes an open-ended elongated tubular nursing holder having a neck portion at one open end thereof, a disposable and collapsible liquid-retaining bag open at one end thereof, received within the tubular nursing holder, a plug member at least partially received within the neck portion adapted to clamp a portion of the bag against the internal surface of the neck portion, and a nipple mounted on the neck portion. The plug member has an axial bore formed therethrough and a one-way check valve associated therewith for allowing liquid to be withdrawn from the bag while serving to prevent the entry of air thereinto. In addition, a piston or valve member is provided which, upon withdrawal of the liquid from the bag and as a result of the vacuum generated in the bag and the prevailing ambient atmospheric pressure, causes the bag to collapse so that the effective inner volume of the bag always substantially equals the volume of the liquid remaining therein.

Claims8

Dependent claims

A nursing unit comprising:

an open-ended, elongated, tubular nursing holder having a hollow sidewall and a neck portion at one open end thereof;
a disposable, collapsible, liquid-retaining bag open at one end thereof received within said tubular nursing holder, said bag having an upper marginal portion adjacent to said open end thereof folded outwardly and over the external surface of said neck portion;
a plug member at least partially received within said neck portion adapted to clamp a portion of said bag adjacent to said upper marginal portion thereof against the internal surface of said neck portion, said plug member having an axial bore formed therethrough and a one-way check valve associated therewith for allowing liquid to be withdrawn from said bag while serving to prevent the entry of air thereinto;
a nipple mounted on said neck portion;
and
a piston slidably retained in an air-tight manner within said holder beneath said bag which, upon withdrawal of the liquid from the bag and as a result of the vacuum generated in the bag and the prevailing ambient atmospheric pressure, is caused to move against said bag causing the collapse thereof so that the effective inner volume of the bag always substantially equals the volume of the liquid remaining therein.

3 more elements

A nursing unit comprising:

an open-ended, elongated, tubular nursing holder having a hollow sidewall and a neck portion at one end thereof;
a disposable, collapsible, liquid-retaining bag open at one end thereof received within said tubular nursing holder, said bag having an upper marginal portion adjacent to said open end thereof folded outwardly and over the external surface of said neck portion;
a plug member at least partially received within said neck portion adapted to clamp a portion of said bag adjacent to said upper marginal portion thereof against the internal surface of said neck portion, said plug member having an axial bore formed therethrough and a one-way check valve associated therewith for allowing liquid to be withdrawn from said bag while serving to prevent the entry of air thereinto;
a nipple mounted on said neck portion;
and
valve means mounted within said holder beneath said bag for regulating the admission of air into the opposite end of said holder so as to permit the collapse of the bag during the withdrawal of liquid therefrom in such a manner that the effective inner volume of said bag always substantially equals the volume of the liquid remaining therein.

3 more elements

Dependencies are inferred from the claim text.