SINGLE-THREAD SCREW THREAD VARIATOR DEVICE Russian patent published in 2019 - IPC B65D51/22 

FIELD: package and storage.

SUBSTANCE: device for automatic opening for package comprises elongated cylindrical body (3), outer surface of which has external thread, cap (26) containing cutting device for cutting package, and basing element (9), lower surface of which is made with possibility of attachment to the part being cut. Cap (26) comprises top element (27) and elongated lateral wall (28) protruding in vertical direction, on inner surface of which there is a thread providing the possibility of screwing cap (26) onto external thread (2) of elongated cylindrical body (3). At that, external thread comprises at least one first groove (2c) and at least one second groove (2f) of opposite direction in relation to said at least one first groove (2c), wherein said at least one second groove (2f) is a continuation of said at least one first groove (2c). Such threading allows the thread ledge to change its path in the thread groove when performing twisting and untwisting. Device of variator with screw thread, containing neck (3) of package and cap (26), equipped with several protruding cutting elements (30) on inner surface (29) of cap element (27). Said variator with screw thread comprises several downward grooves (2c) connected to ascending grooves (2f), through which segments (19) with internal screw thread can pass.

EFFECT: invention relates to automatic opening device for packing, as well as to variable direction thread intended for use in package cover.

13 cl, 6 dwg