S-Shaped Profile Coiled Hose Radial Expansion
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Solution Overview
Problem
Coiled hoses with a hooked profile face challenges in expansion and cutting to length due to risk of windings becoming unhooked and resulting in protruding ends, which complicates processing and connection within flexible line elements.
Innovation Solution
A coiled hose with an S-shaped metal band profile featuring axially running wall sections connected by a web and bent rims, where both the web and edges are inclined at least 10 degrees radially, allowing for radial pressing to expand or cut the hose without losing interlocking, enabling easier length adjustment and connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hooked profile is used in coiled hoses, then mobility and axial movement are improved, but expansion and cutting become problematic due to windings becoming unhooked
Solution Approach 1:
The patent changes the geometric parameters of the profile from a simple hook shape to an S-shaped profile with specific angular characteristics. The web and edges are inclined at least 10 degrees to the radial direction, creating a more stable interlocking mechanism that maintains reliability during expansion and cutting while preserving mobility.
Solution Approach 2:
The S-shaped profile introduces asymmetry in the arrangement of the web and bent rims compared to the symmetric hook profile. This asymmetric configuration creates a more reliable interlocking mechanism where the angled web and rims engage in a way that prevents unhooking during expansion, while still allowing axial movement for mobility.
2Strength
If a folded or Agraff profile is used, then robustness and expandability are improved, but axial movement and mobility are significantly reduced
Solution Approach 1:
The patent modifies the profile geometry by inclining the web and edges at specific angles (at least 10 degrees to radial direction) rather than creating the tight folds of an Agraff profile. This parameter change maintains robustness through the angled interlocking while preserving axial mobility by avoiding the restrictive folded configuration.
Solution Approach 2:
The S-shaped profile applies different geometric characteristics to different parts of the structure: the angled web provides robustness and stability, while the bent rims at specific angles enable axial movement. This local differentiation of geometric properties allows simultaneous achievement of robustness and mobility.
3Ease of manufacture
If simple bevelled edges are used for hooked profile, then ease of manufacture is improved, but expansion reliability deteriorates due to unhooking risk
Solution Approach 1:
The patent specifies precise angular parameters for the web and edges (at least 10 degrees inclination to radial direction) that balance manufacturability with expansion reliability. These controlled angular parameters allow for systematic production while ensuring stable interlocking during expansion, avoiding both simple bevels and complex folds.
Data Source
Figure 1~3
Figure 4a~4b
AI summary
The invention relates to a wound hose. This hose consists of an approximately S-shaped profiled metal strip (1) wound into a hose in helical turns (2). The profile of the metal strip (1) has two substantially axially extending, radially spaced wall sections (6, 7) connected to each other by a web (5) and each provided with a bent edge (3, 4) at its end. The profiles of each pair of adjacent turns (2) are interlocked by their edges (3, 4) in such a way that they are axially movable relative to each other between a compressed and a stretched position. Both the web (5) and the edges (3, 4) of the profile are inclined at an angle of at least 10 degrees to a radial direction.