Child resistant closure and spout combination

1. A screw top closure attachable to a container neck having cooperating screw-on features, the closure comprising:

an closure body having an radial flange, defining a central aperture, and an annular skirt extending axially downward along an outer periphery of the radial flange;

a collapsible spout having a first invertible cone section with a peripheral container plug seal sealingly engaging the radial flange, a second cone section defining a dispensing aperture along an inner facing, and at least one overcap engagement protrusion positioned on an outer facing of the first and/or second cone section(s) and wherein the first and second cone sections are contiguous so that, when the spout is collapsed, the second cone section nests within the first cone section so as to be at least partially coaxially nested within the annular skirt and, when the spout is extended, the second cone section extends axially above the first cone section; and

an overcap attachable to the second cone section, the overcap having a top panel with an integral pull ring, a deformable skirt extending axially downward along an outer periphery of the top panel, and a child resistant protrusion positioned proximate to a terminal edge of the deformable skirt and wherein the child resistant protrusion engages the overcap engagement protrusion to selectively prevent removal of the overcap from the spout except when the deformable skirt is squeezed with sufficient force to disengage the child resistant and overcap protrusions;

wherein the child resistant protrusion is a plurality of ratchet teeth formed along an outer facing of the deformable skirt; and

wherein the overcap engagement protrusion includes cooperating ratchet teeth positioned to face inward so as to engage the child resistant protrusion.

2. The screw top closure of claim 1 wherein the child resistant protrusion is a pair of ramped lugs extending axially downward beyond a terminal edge of the deformable skirt.

3. The screw top closure of claim 1 wherein the cooperating ratchet teeth are formed on substantially all of a periphery of the first and/or second cone section(s).

4. A screw top closure attachable to a container neck having cooperating screw-on features, the closure comprising:

an closure body having an radial flange, defining a central aperture, and an annular skirt extending axially downward along an outer periphery of the radial flange;

a collapsible spout having a first invertible cone section with a peripheral container plug seal sealingly engaging the radial flange, a second cone section defining a dispensing aperture along an inner facing, and at least one overcap engagement protrusion positioned on an outer facing of the first and/or second cone section(s) and wherein the first and second cone sections are contiguous so that, when the spout is collapsed, the second cone section nests within the first cone section so as to be at least partially coaxially nested within the annular skirt and, when the spout is extended, the second cone section extends axially above the first cone section; and

an overcap attachable to the second cone section, the overcap having a top panel with an integral pull ring, a deformable skirt extending axially downward along an outer periphery of the top panel, and a child resistant protrusion positioned proximate to a terminal edge of the deformable skirt and wherein the child resistant protrusion engages the overcap engagement protrusion to selectively prevent removal of the overcap from the spout except when the deformable skirt is squeezed with sufficient force to disengage the child resistant and overcap protrusions;

wherein the child resistant protrusion is a plurality of ratchet teeth formed along an outer facing of the deformable skirt; and

wherein an annular overcap plug seal, formed at a transition point between the first and second cone sections, abuts the terminal edge of the deformable skirt.

5. The screw top closure of claim 4 wherein the overcap engagement protrusion is formed on the annular overcap plug seal.

6. The screw top closure of claim 5 wherein the overcap engagement protrusion includes cooperating ratchet teeth formed on an inner facing of the annular overcap plug seal.

7. The screw top closure of claim 1 wherein anti-back off lugs are formed along an inner facing of the annular skirt.

8. The screw top closure of claim 7 wherein the anti-back off lugs engage cooperating lugs on an outer circumference of a container neck.

9. The screw top closure of claim 1 wherein anti-back off teeth are formed on a top facing of the radial flange.

10. The screw top closure of claim 1 wherein a removable panel initially seals the dispensing aperture.

11. The screw top closure of claim 1 wherein a plug seal is formed on an underside of the top panel so as to seal the dispensing aperture.

12. The screw top closure of claim 1 further comprising a container having one or more lugs proximate to a neck which engage an inner facing of the annular skirt to prevent removal of the screw top closure after said screw top closure has been threadingly coupled to the neck.

13. The screw top closure of claim 4 wherein anti-back off lugs are formed along an inner facing of the annular skirt.

14. The screw top closure of claim 13 wherein the anti-back off lugs engage cooperating lugs on an outer circumference of a container neck.

15. The screw top closure of claim 4 wherein anti-back off teeth are formed on a top facing of the radial flange.

16. The screw top closure of claim 4 wherein a removable panel initially seals the dispensing aperture.

17. The screw top closure of claim 4 further comprising a container having one or more lugs proximate to a neck which engage an inner facing of the annular skirt to prevent removal of the screw top closure after said screw top closure has been threadingly coupled to the neck.