Single Steerable Rear Wheel Stroller Maneuverability

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Solution Overview

Problem

Conventional baby strollers are complex, heavy, and difficult to maneuver in tight spaces due to increased size and weight, which compromises their maneuverability and stability.

Innovation Solution

A three-wheeled stroller design with a single steerable rear wheel and a triangular frame that positions the combined center of gravity above and low to the ground, minimizing the turning radius and effort required for steering while maximizing stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the stroller uses a conventional four-wheeled design with steerable rear wheels, then the stroller provides stable support, but the turning radius and turning swath are larger making it difficult to maneuver in tight spaces

Engineering Contradiction:

ImprovemaneuverabilityVSAvoidturning swath

Core Design Contradiction:

Ease of operationVSArea of stationary object

Solution Approach 1:

The stroller uses a three-wheeled configuration instead of four, segmenting the wheel arrangement to reduce the turning swath. By having only one steerable rear wheel rather than two, the design achieves tighter turning capability while maintaining stability through the triangular frame geometry.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of having the front wheels steerable (conventional approach), this invention inverts the steering arrangement by making the rear wheel steerable. This inversion allows the stroller to pivot more easily around a tight radius, improving maneuverability in confined spaces.

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

If the stroller frame is extended for jogging and includes parking brakes, then the stroller provides functional versatility, but the size and weight increase reducing maneuverability

Engineering Contradiction:

Improvefunctional versatilityVSAvoidmaneuverability

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The invention extracts and eliminates unnecessary features (parking brakes, extended jogging frame) that increase weight and complexity. By focusing on a simple three-wheeled design with steerable rear wheel, the stroller achieves maneuverability while maintaining essential functionality through the triangular frame geometry.

Inventive Principle:

Principle #2Taking out (Extraction)

3Stability of the object's composition

If the combined center of gravity is positioned high for stability, then the stroller provides better balance, but the turning radius increases and maneuverability decreases

Engineering Contradiction:

ImprovestabilityVSAvoidmaneuverability

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The invention optimizes the center of gravity position by adjusting the triangular frame geometry and wheel arrangement. By positioning the combined center of gravity at the centroid of the equilateral triangle formed by the frame, the design achieves optimal balance between stability and maneuverability, allowing tight turning radii without compromising stability.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS7484739B2Three wheeled stroller with single steerable rear wheel

Publication Date: 2009.02.03 NASH II PHILIP C

AI summary

A three wheeled baby stroller is provided with a single steerable rear wheel. The stroller preferably has the three wheels positioned to form an equilateral triangle, resulting in a highly maneuverable stroller. The stroller has a minimized turning swath and is easily steered. The stroller has a simple and relatively lightweight design. The seat for the infant is positioned relatively low to the ground to increase stability.