Modular Highchair Height Locking With Cam Lever Safety
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Solution Overview
Problem
Existing highchairs with height adjustment mechanisms are often cumbersome and unsafe, requiring complex operations or unnecessary parts that can lead to instability, and lack modularity to accommodate a child's growth and varying needs.
Innovation Solution
A highchair with a locking device featuring a hinged lever and cam system integrated into the carrier, allowing vertical adjustment of the seat with a secondary lock for safety, combined with gas springs for ease of use and a modular design with removable accessories.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex locking device with multiple pins and holes is used for height adjustment, then the seat can be locked at various heights, but the device becomes cumbersome and difficult to operate safely
Solution Approach 1:
The locking device is segmented into a lever component with an integrated cam mechanism that interacts with a rack having multiple engagement positions. This segmentation allows the complex function of locking at multiple heights to be achieved through a simpler, more manageable mechanism than using multiple separate pins and holes.
Solution Approach 2:
The cam mechanism is merged with the lever to form an integrated locking device. The cam's eccentric geometry combines the locking function with the height adjustment function in a single component, eliminating the need for separate pins and holes while maintaining the ability to lock at various heights.
2Stability of the object's composition
If the base extends above the seat surface to provide structural support, then the highchair is more stable, but unnecessary parts extend above the seat surface creating clutter
Solution Approach 1:
The base structure is designed to extend primarily in the horizontal plane rather than vertically above the seat surface. By redistributing the structural support function across the horizontal dimension (wider base spread), the design achieves stability without vertical extension, keeping the overall profile compact and clean.
3Device complexity
If a simple friction-based locking mechanism is used, then the device is simple in structure, but it relies on the weight of the child to lock and may not provide sufficient security
Solution Approach 1:
The cam mechanism uses its eccentric geometry to create a mechanical advantage that generates a locking force counteracting the downward force of the child's weight. The cam's shape converts the vertical load into a radial locking force against the rack, providing positive mechanical locking rather than relying solely on friction.
Solution Approach 2:
The weight of the child, which could potentially cause the simple friction mechanism to fail, is converted into a beneficial force that presses the cam harder against the rack, enhancing the locking effect. The mechanical design transforms the downward gravitational force into a securing mechanism.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The highchair provides a safe, easy-to-use, and adjustable seating solution that accommodates a child's growth, with a secure locking mechanism and modular components for versatility, ensuring stability and ease of assembly/disassembly.
Implementation Method 1
the highchair comprises at least one gas spring, one end of which is mounted on the base and the other end of which is mounted on the seat
Implementation Method 2
said lever is a hinged lever mounted on the carrier with at least one cam, and at least one substantially vertical rack mounted on the base having a scalloped surface with ridges and grooves, such that the cam can be rotated around the hinge axis into and out of a chosen groove of the rack
Implementation Method 3
at least one substantially vertical rack mounted on the base having a scalloped surface with ridges and grooves, such that the cam can be rotated around the hinge axis into and out of a chosen groove of the rack
Implementation Method 4
said lever is hinged at its upper end, and extends downward abutting a fixed portion of the carrier in the locked position
Data Source
AI summary
A highchair comprising a base arranged to rest on a floor, a carrier mounted on said base and adjustable in a substantially vertical direction with respect to said base, and a seat comprising a substantially horizontally extending seat surface connected to said carrier, wherein said carrier extends substantially downward from the front edge of said seat surface.