Spaced Retaining Elements for Flat Protective Device Winding
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Solution Overview
Problem
Existing flat protective devices face challenges in securely holding a surface web under strong forces while rolling up onto a winding shaft without forming bulges or waves, as massive holding parts create unaesthetic bulges and hinder even rolling.
Innovation Solution
The holding parts are arranged radially one above the other, with sections protruding beyond the winding shaft, allowing for a stable and solid design that prevents bulging by forming a first row only after multiple revolutions, enabling a compact rolled-up state and secure attachment to the surface web.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If holding parts are made massive to withstand large forces, then strength and stability are improved, but the device creates thick bulges that prevent even rolling and create waves
Solution Approach 1:
The holding parts are segmented into multiple rows arranged radially around the winding shaft. Instead of using fewer massive holding parts, the invention divides them into many smaller parts distributed in multiple rows (first row, second row, etc.), allowing the web to roll evenly without bulges while each individual holding part remains sufficiently strong.
Solution Approach 2:
The holding parts are arranged in multiple radial rows around the winding shaft, transitioning from a single-line arrangement to a two-dimensional radial distribution. This dimensional change allows the holding parts to be distributed around the circumference, preventing bulge formation while maintaining sufficient strength through the combined effect of multiple parts.
2Stability of the object's composition
If holding parts are arranged closely to form continuous rows, then stability is improved, but the device complexity and manufacturing precision requirements increase
Solution Approach 1:
The invention uses more holding parts than traditionally necessary, distributing them across multiple rows. This excessive number of holding parts provides stability through redundancy, allowing some variation in spacing without compromising overall stability, thereby reducing the stringency of manufacturing precision requirements.
3Ease of operation
If holding parts protrude beyond the surface web edge, then guidance in the guide rail is improved, but the device creates an unaesthetic appearance when rolled up
Solution Approach 1:
The holding parts are designed to protrude beyond the surface web edge during the winding process to ensure proper guidance and alignment in the guide rail. This preliminary protrusion action ensures correct positioning during operation, while the radial multi-row arrangement ensures that when rolled up, the holding parts are distributed evenly and do not create unsightly bulges.
Data Source
Figure 1a~4c
Figure 3c~5
Figure 6a~6f
AI summary
The invention relates to a planar protective device (85). The planar protective device (85) has a planar web that can be wound onto a winding shaft (86) in the winding direction. Retaining elements are arranged on at least one, and in particular on both, outer edges of the planar web extending in the winding direction. These retaining elements are spaced apart in the winding direction such that the retaining elements that accumulate in the area of the winding shaft (86) when the planar web is wound up form a first row (94) of retaining elements that are substantially gapless.