Hose Clamp Band Loop Angling for Slot Stress Reduction

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Solution Overview

Problem

Hose clamps require a relatively large space due to increased tensile stress and width adjustments to accommodate clamping screw slots, compromising strength.

Innovation Solution

The hose clamp design features angled band loops adjacent to clamping screw slots, increasing cross-sectional area without sharp edges, and includes cylindrical housing portions with threaded holes and recesses for efficient assembly and locking, along with a secondary band for hose protection and guidance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If the band width is increased to compensate for tensile stress at slots, then the strength is improved, but the hose clamp requires a relatively large space

Engineering Contradiction:

ImprovestrengthVSAvoidspace

Core Design Contradiction:

StrengthVSVolume of moving object

Solution Approach 1:

The band width is varied locally: wider sections are positioned at the slots where tensile stress is highest, while narrower sections are used where less strength is required. This local variation in cross-sectional area optimizes strength distribution without increasing the overall width of the hose clamp.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of increasing band width in the radial direction to compensate for slot weaknesses, the invention utilizes the longitudinal dimension by positioning wider band sections specifically at the slot locations. This dimensional approach allows strength compensation without increasing the overall hose clamp width.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of operation

If the slot width is increased to allow easy insertion of clamping screw head, then the ease of operation is improved, but the tensile stress in the band increases

Engineering Contradiction:

Improveease of insertionVSAvoidtensile stress

Core Design Contradiction:

Ease of operationVSStress or pressure

Solution Approach 1:

The band width is locally increased at the slot regions to compensate for the stress concentration caused by wider slots. This allows the slots to be sufficiently wide for easy screw insertion while the adjacent wider band sections maintain adequate tensile strength.

Inventive Principle:

Principle #3Local quality

3Volume of moving object

If the band is made narrower to reduce space requirements, then the volume is reduced, but the strength at the slot portions decreases

Engineering Contradiction:

ImprovespaceVSAvoidstrength

Core Design Contradiction:

Volume of moving objectVSStrength

Solution Approach 1:

The hose clamp uses a non-uniform band width design where wider sections are strategically positioned at the slots to maintain strength, while narrower sections are used in other areas to reduce overall space requirements. This local variation resolves the contradiction between compact size and structural strength.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS8181314B2Hose clamp

Publication Date: 2012.05.22 NORMA SWEDEN AB

AI summary

A hose clamp (1) comprises bands (2) forming an open ring. The ends of the open ring have band loops (3, 4) arranged around housing portions (5, 6), between which housing portions (5, 6) a clamping screw (7) with a head (8) is arranged. The bands (3, 4) adjacent to the housing portions (5, 6) have slots (9, 10). The band loop (4) along the slot (10), at least adjacent to the head (8) of the clamping screw, is turned on both sides of the slot (10) in such a manner that the distance between the band portions (11) turned adjacent to the slot (10) adjacent to the head (8) of the clamping screw is greater than the outer diameter of the head (8) of the clamping screw.