Height-Adjustable Stroller Chassis with Inner Tube Locking
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Solution Overview
Problem
Existing stroller chassis designs are cumbersome and heavy, with low mounting heights that require parents to bend excessively, exposing children to pollutants and making it difficult to use with taller parents, and existing height adjustment solutions are either structurally complex or unsuitable for full-fledged stroller seat integration.
Innovation Solution
A lightweight stroller chassis with a height-adjustable connection device featuring two inner tubes within guide tubes, allowing for compact folding and multiple locking positions, ensuring stability and ease of use by synchronizing the height adjustment of both inner tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the mounting height of the stroller seat is reduced to achieve compact folding, then the chassis can be folded to a very small size, but parents have to bend down very far which puts considerable strain on the parent's back
Solution Approach 1:
The patent applies a height-adjustable connection device that allows the mounting height to be dynamically changed between at least two different heights. The connection device includes inner tubes that can be positioned at different height levels within guide tubes, enabling the stroller seat to be mounted at an ergonomically suitable height for parents while maintaining the ability to fold compactly when needed.
2Ease of operation
If a height-adjustable mounting bracket is added to increase mounting height, then ease of access is improved, but the device complexity and weight increase
Solution Approach 1:
The connection device is designed to serve multiple functions: it provides height adjustment for ergonomic access, maintains the folding capability of the chassis, and secures the stroller seat firmly at the selected height. The same structural elements (inner tubes, guide tubes, locking mechanisms) that enable height adjustment also contribute to the overall stability and folding function of the chassis.
3Ease of operation
If existing height adjustment solutions are implemented, then mounting height is adjustable, but the structural complexity and weight are high which is not desirable for normal strollers
Solution Approach 1:
The height adjustment mechanism is segmented into discrete, modular components: guide tubes fixed to the chassis, inner tubes that slide within the guide tubes, and locking mechanisms with locking elements. This segmentation allows for a lightweight construction where each component is simple and can be manufactured from thin-walled tubes, avoiding the need for heavy-duty mechanical structures.
Data Source
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AI summary
The chassis (1) for a pushchair or buggy with a connecting device (7) for fastening of a shell, seat, or car seat, has a unit (6) for adjusting the height of the connecting device, and is formed by vertically extending guide tubes installed on the frame (2) on each side, and an inner tube which is movable in the guide tube in each case and lockable in at least two different positions. A locking element as a component part of the connecting device is located on the upper section of the inner tube.