Plastic plug with overcap

A method of installing a plug and overcap assembly into a container opening using an air-actuated tooling fixture, said tooling fixture including moveable collets, a reversible wrench drive, a sliding detent ring, a piston and a holder, said method comprising the following steps:

• (a) positioning the collets around the assembly;
• (b) moving the sliding detent ring to begin a partial hold of said assembly in position over said opening;
• (c) activating a supply of air to introduce air pressure into a chamber within said tooling fixture;
• (d) raising a piston in response to said air pressure in said chamber;
• (e) moving said collets in response to raising said piston for clamping said collets onto said assembly;
• (f) supplying air to said wrench drive for applying a turning torque to said assembly;
• and
• (g) installing said assembly into said container opening.

A tooling fixture for use in installing a closure into a container opening, said tooling fixture comprising:

• an air-operated wrench drive;
• a moveable piston positioned within a housing;
• a plurality of gripping collets moveable with said piston;
• an air valve constructed and arranged to provide a supply of air into said housing;
• a sleeve connected to said drive assembly and constructed and arranged to apply pressure to said collets;
• and
• whereby operation of said wrench drive results in rotation of said collets.

In combination:

• a container defining a container opening;
• and
• a closure constructed and arranged to be received by said container opening, said closure comprising:
• a plug having an upper surface and interior forms for use in turning said plug;
• and
• a tamper-evident overcap constructed and arranged to be securely attached to said upper surface so as to close off said interior forms, wherein a tamper-evident capability is created without reliance on any tamper-evident interfit between said closure and said container.

In combination:

• a container defining a container opening;
• and
• a closure constructed and arranged to be received by said container opening, said closure comprising:
• a plug including overcap-engaging means and being constructed and arranged to be received within said container opening;
• and
• an overcap including plug-engaging means constructed and arranged for interfit into said overcap-engaging means, said overcap being attached to said plug so as to create an integral assembly, wherein said interfit helps to prevent rotation of said overcap relative to said plug.