Blow molded plastic bottle and antitamper cap
AssigneeMaxcap, Inc.
InventorsJohn J. Virog, Jr., Leo Von Hagel
Life of this patent
Estimating the term…
Abstract
A bottle and cap construction for thin-walled plastic milk bottles. It has a double thread and an anti-tamper arrangement.
Claims29
A combination of a blow molded plastic milk bottle and a plastic cap, comprising
- (a) a neck at the mouth of said bottle, said neck having an external screw thread and an upper inwardly directed circumferential lip,
- (b) said plastic cap adapted to be screwed onto said neck to cover said mouth and having an upper wall, a cylindrical side wall with an internal thread corresponding to said external thread, and a downwardly directed circular plug for engaging said lip when said cap is screwed onto said neck, and to form an anti-leak seal by pressing against said lip,
- (c) cooperating antitamper means on said cap and bottle and including a permanently deformable element, said antitamper means permitting said cap to be rotated in one direction to screw said cap onto said neck to bring said plug into sealing relation to said lip and then preventing rotation in an unscrewing direction unless said element is visibily deformed,
- said threads being multiple-start threads comprising
- a plurality of external threads of identical pitch having effective portions substantially symmetrically disposed around the periphery of said neck and
- a plurality of internal threads of identical pitch having effective portions substantially symmetrically disposed around the internal periphery of said cap.
A combination of a blow molded plastic milk bottle and a plastic cap, comprising
- (a) a neck at the mouth of said bottle, said neck having an external screw thread,
- (b) said plastic cap adapted to be screwed onto said neck to cover said mouth and having an upper wall, a cylindrical side wall with an internal thread corresponding to said external thread, and means for effecting anti-leak sealing engagement with said neck when said cap is screwed onto said neck,
- (c) cooperating antitamper means on said cap and neck and including a permanently deformable element, said antitamper means permitting said cap to be rotated in one direction to screw said cap onto said neck to effect said sealing engagement and then preventing rotation in an unscrewing direction unless said element is visibly deformed, said antitamper means comprising
- a tab projecting outwardly of said side wall and having at least one flexible frangible connection to said side wall,
- an upwardly projecting lug having an inner edge which is spaced outwardly from said side wall and is engaged by said tab when said cap has been partly screwed onto said neck,
- the construction and arrangement being such that when said cap is being screwed on and said tab passes through said space between said inner edge and said cap wall said frangible connection flexes without breaking and said tab is pressed against said side wall.
A combination of a blow molded plastic milk bottle and a plastic cap, comprising
- (a) a neck at the mouth of said bottle, said neck having an external screw thread
- (b) said plastic cap adapted to be screwed onto said neck to cover said mouth and having an upper wall, a cylindrical side wall with an internal thread corresponding to said external thread, and means for effecting anti-leak sealing engagement with said neck when said cap is screwed onto said neck,
- (c) cooperating antitamper means on said cap and neck and including a permanently deformable element, said antitamper means permitting said cap to be rotated in one direction to screw said cap onto said neck to effect said sealing engagement and then preventing rotation in an unscrewing direction unless said element is visibly deformed, said antitamper means comprising
- a tab projecting outwardly of said side wall and having at least one flexible frangible connection to said side wall,
- an upwardly projecting lug having an inner edge which is spaced outwardly from said side wall and is engaged by said tab when said cap has been partly screwed onto said neck,
- said tab having an upstream edge which is moved past at least a portion of said lug when said cap has rotated to fully closed position and which engages said lug when said cap is rotated in an unscrewing direction, the construction and arrangement of said upstream edge and said lug being such that said upstream edge is forced outward to break said frangible connection on further rotation in said unscrewing direction.
A molded plastic cap, for use with a blow molded plastic bottle having an externally screw threaded neck at its mouth, said plastic cap adapted to be screwed onto said neck to cover said mouth and having an upper wall, a cylindrical side wall with an internal thread corresponding to said external thread, and means for effecting anti-leak sealing engagement with said neck when said cap is screwed onto said neck,
- said cap having an antitamper means comprising a tab projecting outward from said side wall and connected to said side wall by a flexible frangible connection,
- said tab being adapted to engage an inner edge of an upwardly projecting lug on said bottle which inner edge is spaced outwardly of said cap side wall and is engaged by said tab when said cap is partly screwed onto said neck,
- said tab being adapted to pass through the space between said inner edge and cap wall when said cap is being screwed onto said neck, and said tab having an upstream edge which is moved past at least a portion of said lug when said cap has rotated to fully closed position and which engages said lug when said cap is rotated in an unscrewing direction, the construction and arrangement of said upstream edge and said lug being such that said upstream edge is forced outward to break said frangible connection on further rotation in said unscrewing direction.
A molded plastic cap, for use with a blow molded plastic bottle having an externally screw threaded neck at its mouth, said neck having an upper inwardly directed circumferential lip,
- said plastic cap adapted to be screwed onto said neck to cover said mouth and having an upper wall, a cylindrical side wall with an internal thread corresponding to said external thread, and a downwardly directed circular plug for engaging said lip when said cap is screwed onto said neck and to form an anti-leak seal by pressing against said lip,
- said cap having antitamper means, including a permanently deformable element, for cooperating with means on said bottle, said antitamper means permitting said cap to be rotated in one direction to screw said cap onto said neck to bring said plug into sealing relation to said lip and then preventing rotation in an unscrewing direction unless said element is visibly deformed,
- said threads being multiple-start threads comprising
- a plurality of external threads of identical pitch having effective portions substantially symmetrically disposed around the periphery of said neck and
- a plurality of internal threads of identical pitch having effective portions substantially symmetrically disposed around the internal periphery of said cap.
A blow molded plastic milk bottle having a neck, said neck having external threads and an upper inwardly directed circumferential lip adapted to be engaged by a downwardly directed circular plug of an internally threaded plastic cap for said bottle so as to form an anti-leak seal by pressure between said plug and said lip, said bottle having antitamper means for cooperating with antitamper means on said cap, said antitamper means on said cap including a permanently deformable element, said cooperating antitamper means of said bottle permitting said cap to be rotated in one direction to screw said cap onto said neck to bring said plug into sealing relation to said lip and then preventing rotation in an unscrewing direction unless said element is visibly deformed,
- said threads being multiple-start threads comprising
- a plurality of external threads of identical pitch having effective portions substantially symmetrically disposed around the periphery of said neck and
- a plurality of internal threads of identical pitch having effective portions substantially symmetrically disposed around the internal periphery of said cap.
Dependencies are inferred from the claim text.