Non-Circular Dispensing Closure Preventing Rotation and Tampering

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Solution Overview

Problem

Existing dispensing packages lack a secure, non-removable, and non-rotatable closure that prevents accidental removal or tampering during normal use, especially in containers with inclined sidewalls and snap-on or screw-type closures.

Innovation Solution

A dispensing package featuring a container with a non-circular neck finish and a corresponding non-circular closure, utilizing shallow lead-in and steep back angles on circumferentially extending engagement elements for a press-fit seal and prevention of closure removal, along with a child-resistant latch for added security.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional snap-on or screw-type closure is used, then the closure can be easily removed during normal use, but this allows accidental removal or tampering

Engineering Contradiction:

Improveclosure securityVSAvoidclosure removal

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The closure and container neck feature non-circular cross-sections that are asymmetric in shape. The closure wall has a non-circular cross-section corresponding to the non-circular cross-section of the neck finish, with engagement elements having specific lead-in and back angles that prevent rotation and accidental removal while maintaining controlled dispensing operation

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The engagement elements are designed with a shallow lead-in angle to enable press-fit during assembly, and a steep back angle to retard removal during use. This dynamic geometric design allows the closure to be securely installed but prevents accidental removal while still permitting intentional opening through the hinged lid mechanism

Inventive Principle:

Principle #15Dynamics

2Reliability

If a secure press-fit closure is implemented with steep back angles, then removal is prevented, but the closure cannot be opened for dispensing

Engineering Contradiction:

Improveclosure retentionVSAvoiddispensing access

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The closure is segmented into a base portion that remains securely fitted to the container neck and a hinged lid portion that can be opened for dispensing. The lid is hinged to the base, allowing the lid to be opened while the base remains firmly attached through the engagement elements with steep back angles

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The engagement elements feature a shallow lead-in angle facilitating initial press-fit installation, and a steep back angle that prevents removal once installed. This dynamic geometric design allows the closure to be securely installed but prevents accidental removal while still permitting intentional opening through the hinged lid mechanism

Inventive Principle:

Principle #15Dynamics

3Reliability

If circular cross-section engagement elements are used, then the closure can rotate on the neck finish, but this may allow tampering or improper positioning

Engineering Contradiction:

Improveclosure positioningVSAvoidclosure structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentEP1968857B1Dispensing package having non-removable and non-rotatable dispensing closure

Publication Date: 2013.06.05 BPREX HEALTHCARE PACKAGING INC

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AI summary

A dispensing package includes a container (26) having a neck finish (24) with an axis, a non-circular cross section in a plane perpendicular to the axis, and at least one circurnf erentially extending external engagement element (30) on the neck finish. A closure (22) has a wall (42) received over the container neck finish. The wall has a non-circular cross section corresponding to the non-circular cross section of the neck finish and at least one internal circumferentially extending engagement element (44) in engagement with the external engagement element on the neck finish. The internal circumferentially extending engagement element and/or the external circumferentially extending engagement element has a shallow lead- in angle (32) to enable press-fit of the closure onto the container neck finish and a steep back angle (34) to retard removal of the closure from the neck finish. Rotation of the closure on the neck finish is prevented by the non-circular cross sections of the neck finish and the closure wall.