Apparatus for dispensing a liquid from a container

Claim 1

An apparatus for pumping a liquid under air pressure from a container having a rim and defining an interior chamber holding the liquid from the bottom of the chamber to a predetermined liquid level, an air space being defined between the liquid level and the rim, the apparatus being disposed and locked on the container above the air space, which apparatus is a unit comprising a. a housing defining an air inlet for delivering air into the air space and including two clamps engageable with the rim of the container for disposing and locking the housing of the container, b. means mounted on the housing for imparting superatmospheric pressure to the air whereby the air is delivered to the space under said pressure, c. a check valve in the inlet for preventing the air under pressure from escaping from the space, d. a tap standpipe in communication with the bottom of the chamber and defining an air channel arranged for connection to the inlet, the air channel being in communication with the space, whereby the superatmospheric pressure in the space above the liquid level pumps the liquid into and through the standpipe, e. a liquid outlet in communication with the tap standpipe, 1. one of the clamps defining a bore constituting a liquid conduit having one end in communication with the tap standpipe and receiving the liquid therefrom and another end in communicating with the liquid outlet for delivering the liquid thereto, and f. a shutoff valve mounted in the liquid conduit for selectively opening and closing the outlet.

Claim 2

An apparatus for pumping a liquid under air pressure from a container having a rim and defining an interior chamber holding the liquid from the bottom of the chamber to a predetermined liquid level, an air space being defined between the liquid level and the rim, the apparatus being disposed and locked on the container above the air space, which apparatus is a unit comprising a. a housing defining an air inlet for delivering air into the air space and including two clamps engageable with the rim of the container for disposing and locking the housing of the container, b. means mounted on the housing for imparting superatmospheric pressure to the air whereby the air is delivered to the space under said pressure, c. a check valve in the inlet for preventing the air under pressure from escaping from the space, d. a tap standpipe in communication with the bottom of the chamber and defining an air channel arranged for connection to the inlet, the air channel being in communication with the space, whereby the superatmospheric pressure in the space above the liquid level pumps the liquid into and through the standpipe, e. a liquid outlet in communication with the tap standpipe, 1. one of the clamps defining a bore constituting a liquid conduit having one end in communication with the tap standpipe and receiving the liquid therefrom and another end in communicating with the liquid outlet for delivering the liquid thereto, and f. a shutoff valve mounted in the liquid conduit for selectively opening and closing the outlet.

Claim 11

An apparatus for pumping a liquid under air pressure from a container having a rim and defining an interior chamber holding the liquid from the bottom of the chamber to a predetermined liquid level, an air space being defined between the liquid level and the rim, the apparatus being disposed and locked on the container above the air space, which apparatus comprises a. a housing defining an air inlet for delivering air into the air space and including two clamps engageable with the rim of the container for disposing and locking the housing on the container, the clamps having respective inner ends, b. means for imparting superatmospheric pressure to the air whereby the air is delivered to the space under said pressure, the presure imparting means including 1. a cylindrical casing mounted between the ends of the clamps and projecting from their surface, 2. a piston received and movably guided in the casing, the piston having a bottom with an outer face and a central, stepped projection, the step in the projection defining a seat, 3. an insert consisting a downwardly tapering conical rim section, an adjoining annular section and a cylindrical hub section projecting upwardly from the annular section, the hub section frictionally engaging the central stepped projection and the upper rim of the hub section engaging the step in the projection which provides the seat for the insert, 4. a membrane loosely mounted on the outer bottom face, the membrane having a circumferential rim sealingly engaging the inner casing wall and a central opening through which the hub section extends, the membrane being held between the outer bottom face of the piston and the annular section of the insert, and 5. an attachment sealingly mounting the casing bottom, c. a check valve in the inlet for preventing the air under pressure from escaping from the space, the casing bottom define a central port in communication with the check valve, d. a tap standpipe in communication with the bottom of the chamber and defining an air channel arranged for connection to the inlet, the air channel being in communication with the space, whereby the superatmospheric air presure in the space above the liquid level pumps the liquid into and through the standpipe, e. a liquid outlet in communication with the tap standpipe, and f. a shutoff valve operable to open and close the outlet.

Claim 12

An apparatus for pumping a liquid under air pressure from a container having a rim and defining an interior chamber holding the liquid from the bottom of the chamber to a predetermined liquid level, an air space being defined between the liquid level and the rim, the apparatus being disposed and locked on the container above the air space, which apparatus comprises a. a housing defining an air inlet for delivering air into the air space and including two clamps engageable with the rim of the container for disposing and locking the housing on the container, the clamps having respective inner ends, b. means for imparting superatmospheric pressure to the air whereby the air is delivered to the space under said pressure, the presure imparting means including 1. a cylindrical casing mounted between the ends of the clamps and projecting from their surface, 2. a piston received and movably guided in the casing, the piston having a bottom with an outer face and a central, stepped projection, the step in the projection defining a seat, 3. an insert consisting a downwardly tapering conical rim section, an adjoining annular section and a cylindrical hub section projecting upwardly from the annular section, the hub section frictionally engaging the central stepped projection and the upper rim of the hub section engaging the step in the projection which provides the seat for the insert, 4. a membrane loosely mounted on the outer bottom face, the membrane having a circumferential rim sealingly engaging the inner casing wall and a central opening through which the hub section extends, the membrane being held between the outer bottom face of the piston and the annular section of the insert, and 5. an attachment sealingly mounting the casing bottom, c. a check valve in the inlet for preventing the air under pressure from escaping from the space, the casing bottom define a central port in communication with the check valve, d. a tap standpipe in communication with the bottom of the chamber and defining an air channel arranged for connection to the inlet, the air channel being in communication with the space, whereby the superatmospheric air presure in the space above the liquid level pumps the liquid into and through the standpipe, e. a liquid outlet in communication with the tap standpipe, and f. a shutoff valve operable to open and close the outlet.