Interfolded Napkin Dispenser With Pivoting Holdback Tabs
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Solution Overview
Problem
Existing napkin dispensers for interfolded napkins face issues with napkins becoming ruffled, buckling, and being disordered due to friction, leading to difficulties in extraction and maintaining the stack's integrity during use.
Innovation Solution
A dispenser design featuring flexible hinges and stop surfaces for the holdback members, allowing them to pivot between holding and loading orientations, reducing friction and damage during loading and ensuring the stack remains organized and easily accessible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If napkins are arranged in a stack standing on an edge with part protruding through the opening, then the napkins are easily accessible and can be readily removed, but the protruding parts become ruffled and deformed
Solution Approach 1:
The holdback members are made pivotable between a first position (extending over the opening to retain the stack) and a second position (retracted to allow loading). This dynamic positioning allows the system to adapt between two operational states: during loading, the holdback members are retracted to avoid interfering with the stack insertion; during dispensing, they extend to prevent napkins from becoming ruffled by protruding through the opening
2Reliability
If napkins are arranged in an interfolded stack and successively removed through the dispensing opening, then the stack is contained and protected, but friction causes multiple napkins to follow together or the stack becomes disordered and crumpled
Solution Approach 1:
The holdback members act as intermediary elements between the stack and the dispensing opening. By positioning themselves between the stack and the opening, they provide controlled interaction points that prevent excessive friction and unwanted movement of multiple napkins simultaneously, while still allowing smooth extraction of single napkins
3Reliability
If holdback members extend over the dispensing opening to retain the stack, then the stack is held in position during withdrawal, but the members interfere with loading a new stack
Solution Approach 1:
The holdback members are designed to be pivotable between two positions: in the first position, they extend over the dispensing opening to effectively retain the stack during napkin withdrawal; in the second position, they are pivoted to clear the loading path, allowing a new stack to be inserted without interference. This dynamic repositioning resolves the conflict between retention and loading operations
Data Source
AI summary
A dispenser for interfolded napkins includes a container having a supporting surface for supporting a stack of interfolded napkins. The supporting surface extends in a horizontal plane, and is surrounded by side walls extending in a vertical direction perpendicular to the supporting surface. The side walls define a dispensing opening opposite the supporting surface. At least one tab is arranged in the container for retaining the stack of napkins during withdrawal of a napkin from the stack. The tab is pivotably arranged in relation to the container between a holding position, in which the tab extends horizontally over at least a portion of the dispensing opening, and a refill position, in which the tab is directed away from the dispensing opening. The tab pivots about a living hinge. One or more stop surfaces limit an extent to which the tab is able to turn about the living hinge toward the dispensing mouth.