Backpack Strap Height Adjustment Mechanism with Anti-Unlock Locking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing mechanisms for height adjustment of backpack straps or lumbar support can inadvertently unlock during use, requiring frequent re-adjustment.
Innovation Solution
A mechanism featuring a base plate with tooth-shaped projections, a sliding plate, and a locking part with a rotary axis and lever, allowing for secure height adjustment without accidental unlocking, using a combination of form-fit engagement and a locking mechanism that can be manually or motor-controlled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spring-loaded button mechanism is used for height adjustment, then quick and simple adjustment is achieved, but the mechanism may get activated automatically during use causing inadvertent unlocking
Solution Approach 1:
The locking part is spring-loaded to automatically engage with the tooth-shaped projections on the guide rail, performing the locking action in advance before any potential inadvertent movement occurs. This preliminary engagement ensures the strap remains securely locked at the desired height without requiring continuous user intervention.
Solution Approach 2:
A lever is introduced as an intermediary element between the locking part and the external environment. The lever must be deliberately moved to trigger the unlocking sequence, where it first disengages from the guide rail's protrusion before allowing the locking part to release. This intermediary mechanism prevents direct accidental activation while maintaining ease of intentional adjustment.
2Reliability
If the locking mechanism is made more secure to prevent inadvertent unlocking, then reliability improves, but the complexity of the mechanism increases
Solution Approach 1:
The locking part combines multiple functions into a single integrated component: it features tooth-shaped projections for engagement with the guide rail, a spring-loaded body for automatic locking, and a lever for controlled unlocking. This merging of functions reduces the need for separate components while maintaining reliability.
Solution Approach 2:
The locking mechanism employs dynamic elements including a spring-loaded locking part that can transition between locked and unlocked states, and a lever that moves through defined positions to control the unlocking sequence. This dynamic design allows the mechanism to adapt to user input while maintaining secure locking during normal use.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a mechanism (1) for height adjustment of backpack, schoolbag or similar straps or lumbar support or for length adjustment of straps on the backpack. The mechanism comprises an elongate base plate (2) with an elongate first cut-out (2a) with a plurality of first tooth-shaped projections (2b), and with a pair of guide grooves (2c), a sliding plate (3) with a pair of tongues (3a) that slides in guide grooves (2c) of the base plate, and with a second cut-out (3b), a supporting plate (4) with a third cut-out (4a) and a pair of noses (4b) that engage the second cut-out (3b) of the sliding plate in a form-fit manner and in which a pair of receiving elements (4c) is formed, a locking part (5) with a rotational axis (5a) in the pair of receiving elements (4c) of the supporting plate, with a body (5b) of the locking part with second tooth-shaped projections (5c) and with a lever (5d), and a mounting plate (6) with a fourth cut-out (6a), through which the lever (5d) of the locking part protrudes. The advantage of the mechanism according to the invention is its possibility of allowing for a quick and easy height adjustment of shoulder straps or lumbar support or length adjustment straps without a risk of inadvertent unlocking.