Dispensing – Axially slidable tubes – sleeves – or apertured caps – Axial discharge
Patent
1997-08-25
1999-11-30
Kaufman, Joseph A.
Dispensing
Axially slidable tubes, sleeves, or apertured caps
Axial discharge
222538, 2225416, B65D 4710
Patent
active
059927100
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a lid for a pail in which there is a pouring spout for the purpose of removing contents of the pail, and in particular to a lid for a pail in which the pouring spout has been integrally injection molded with the remainder of the lid and subsequently severed therefrom to provide a lid with a retractable spout. As used herein, pails include so-called plastic containers having lids.
When the material within a pail is in a fluid form, including powders and liquids, it is convenient to be able to pour the fluid from the container without removing the lid from the container. It is easier and more convenient to use a spout located on the lid to remove the contents from the container, as opposed to removing the lid from the container and pouring the contents directly from the lid-less container.
Lids having spouts are known and frequently used in the pail and container business. Such lids have a neck in which a spout is attached, with the spout being movable from an inverted storage position and reattached in a pouring position prior to use. Alternatively, the lid may have a spout that is movable, without being inverted, from a pouring position to a storage position with the latter being adapted for sealing with a cap.
The formation or manufacture of containers with lids with retractable spouts has required a multi-step manufacturing process, using at least two separate molds. The lid is manufactured in one injection molding operation, normally with an orifice at the location where the spout is to be located. The spout is manufactured in a separate manufacturing process and subsequently attached to the lid by spin-welding or ultrasonic welding, or by snap-fitting a spout into a hole in the lid. The latter is prone to leakage, especially due to non-uniform shrinkage of the lid after molding, which has led to attempts to mold non-circular holes that after shrinkage of the lid are circular in shape.
Such molding-techniques require the construction of separate molds for the spout and for the remainder of the lid, as well as the carrying out of several steps in the process to form the lid with the retractable spout.
A lid with a retractable spout, and a method for the manufacture thereof, have now been found in which the lid and spout are formed in the same molding operation.
Accordingly, the present invention provides a pail lid having a retractable pouring spout, said pail lid having opposed faces with an annular groove on one face at the periphery thereof for attachment to a pail, said lid having an opening between said faces juxtaposed to said annular groove with an annular neck surrounding said opening, said neck being integrally formed as part of said lid and extending from the face of the lid opposed to said groove, said neck having external threads thereon adapted to receive a screw cap, a retractable pouring spout located within said opening that is movable from a pouring position to a retracted position while being retained within said neck, the spout mating with the neck at each of the pouring position and the retracted position.
The present invention also provides a method for the manufacture of a pail lid having a retractable pouring spout, said pail lid having opposed faces with an annular groove on one face at the periphery thereof for attachment to a pail, said lid having an opening between said faces juxtaposed to said annular groove with an annular neck surrounding said opening, said neck being integrally formed as part of said lid and extending from the face of the lid opposed to said groove, said neck having external threads thereon adapted to receive a screw cap, a retractable pouring spout located within said opening, said spout being movable from a pouring position to a retracted position, while being retained within said neck, the spout mating with the neck at each of the pouring position and the retracted position, said method comprising: a cavity of a mold for said lid, said cavity of the mold extending between the neck and the spout with a narrow gate between
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Arshinoff Stephen H.
Lovell Peter J.
Industrial Containers Ltd.
Kaufman Joseph A.
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