Screw Cap Container Slope Threads Prevent Oblique Capping

The patent applies preliminary action by providing guide protrusions on the cap and guide grooves on the container mouth that engage before screwing begins. These guide features pre-align the cap horizontally with the container mouth, preventing oblique capping from occurring in the first place, especially important for wide-mouth containers where oblique capping is more likely.

The guide protrusions and guide grooves act as intermediary elements between the cap and the container mouth. These intermediary features facilitate proper alignment and horizontal positioning during the capping process, mediating the interaction between the cap and wide mouth to prevent closure failure.

The screw threads are segmented into multiple sections with different pitch values. The first section has a larger pitch for easy initial engagement and uncapping, while the second section has a smaller pitch that provides increased resistance and generates a distinct click sensation when the cap transitions between sections during uncapping, thus maintaining both ease of operation and reliable feedback.

The patent changes the pitch parameter of the screw threads along the engagement length. By varying the pitch from larger to smaller values, the patent achieves different operational characteristics: easier initial rotation with larger pitch, and increased resistance with click sensation from the transition point where the cap moves from the first pitch section to the second pitch section.