Reversible Handle Stroller Lock Mechanism
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Solution Overview
Problem
Conventional stroller part assemblies for reversible handle strollers often result in finger pinching when changing handle positions due to protruding engaging projections and compromise aesthetics with outward protrusions.
Innovation Solution
A stroller part assembly featuring a seat support frame, an armrest with an inner space, a rotatable handle, and a lock mechanism comprising first, second, and third interlocking members, where the third interlocking member is movably mounted on the handle to securely engage with the first and second interlocking members within the armrest, allowing for safe and aesthetically pleasing handle position changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If front and rear engaging projections protrude outwardly from the armrest to enable handle positioning, then the handle can be securely locked at different positions, but the appearance of the armrest is adversely affected and finger pinching may occur
Solution Approach 1:
The engaging projections are nested within the inner space of the armrest rather than protruding outward. The first and second engaging projections are received within the inner space, creating a clean external appearance while maintaining the locking function through internal engagement mechanisms
Solution Approach 2:
Instead of having projections extend outward from the armrest, the design inverts the arrangement by placing the engaging projections inside the armrest's inner space, with the handle's engaging projection engaging these internal projections from within
2Reliability
If front and rear engaging projections protrude outwardly from the armrest to enable handle positioning, then the handle can be securely locked at different positions, but finger pinching of the child may occur
Solution Approach 1:
The engaging projections are nested within the inner space of the armrest, removing them from the external surface where a child's hand would rest. This internal nesting eliminates the pinching hazard while preserving the positioning function
Solution Approach 2:
The harmful protruding projections are extracted from the external surface of the armrest and relocated to the internal space, separating the dangerous element from the area where a child's hand would be placed
3Reliability
If a lock mechanism with spring-biased latch is used to engage projecting members, then the handle can be securely locked, but the structure becomes more complex
Solution Approach 1:
The spring-biased latch mechanism is extracted and replaced with a simpler interlocking projection system. The locking function is achieved through the geometric engagement of the first, second, and third engaging projections rather than through a complex spring-loaded latch mechanism
Solution Approach 2:
The engaging projections are designed to automatically engage and lock the handle in position through their geometric configuration. The third engaging projection on the handle self-locks with the first and second engaging projections on the armrest without requiring external spring biasing or actuation mechanisms
Data Source
AI summary
A stroller part assembly includes: a seat support frame; an armrest secured to the seat support frame and defining an inner space; a handle pivoted to the seat support frame so as to be rotatable about an axis relative to the seat support frame; and a lock mechanism including first and second interlocking members disposed in the inner space and secured to the armrest, and a third interlocking member mounted movably on the handle and engageable with the first and second interlocking members.