Bicycle Trailer Folding Mechanism and Hitch Stability
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Solution Overview
Problem
Existing bicycle trailers lack efficient folding mechanisms and stability when towed behind a bicycle, and they often require complex attachment systems that complicate loading and unloading of cargo.
Innovation Solution
A bicycle trailer design featuring a folding mechanism with upper and intermediate hinges that can be secured using a dual actuated lock release, a prop or stand for supporting the trailer in an upright position, and a hitch system that increases stability by attaching above the rear axle of the bicycle wheel, along with load tie-down projections for secure cargo attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a folding mechanism with multiple hinges is added to the trailer, then the trailer can be folded for compact storage, but the device complexity increases
Solution Approach 1:
The trailer frame is divided into multiple segments connected by hinges, allowing each section to fold independently. The frame includes a first section, second section, and third section that can be folded relative to each other through strategically placed hinge joints, enabling compact storage while maintaining structural integrity.
Solution Approach 2:
Multiple locking mechanisms are combined into a single dual actuated lock release system that controls both the towing component hinges and intermediate frame hinges. This integration allows one mechanism to perform multiple locking functions, reducing operational complexity despite the presence of multiple hinges.
2Reliability
If a dual actuated lock release mechanism is used to secure hinges, then the trailer can be locked securely in multiple positions, but the ease of operation decreases
Solution Approach 1:
The dual actuated lock release mechanism serves multiple functions: it locks and unlocks both the towing component hinges and intermediate frame hinges simultaneously, and can operate in two distinct modes (first actuating mode for towing hinges, second actuating mode for frame hinges). This multi-functionality reduces the number of separate mechanisms needed while maintaining secure locking.
Solution Approach 2:
The lock release mechanism incorporates two different actuating modes that adapt to different operational requirements. The first mode uses a twisting motion about a transverse axis for releasing towing hinges, while the second mode uses push buttons for releasing frame hinges, providing dynamic operational flexibility.
3Volume of moving object
If the towing component hinges are released to allow folding, then the towing components can pivot for compact storage, but the stability during towing decreases
Solution Approach 1:
The lock and lock actuator mechanism is engaged during normal towing operations to prevent unintended release of the towing component hinges. This preliminary locking action counteracts any forces that might cause accidental folding, ensuring stable towing while allowing intentional folding when the lock is deliberately actuated.
4Stability of the object's composition
If the hitch is positioned above the rear axle of the bicycle wheel, then the stability during towing is improved, but the ease of attachment and detachment decreases
Solution Approach 1:
The hitch system incorporates a coupling mechanism that acts as an intermediary between the trailer and bicycle. This coupling includes a retainer that can be actuated to release the connection, providing a simple interface that maintains the beneficial high-position stability while compensating for the reduced accessibility through an easy-to-operate release mechanism.
Data Source
AI summary
A trailer for towing by a bicycle is disclosed comprising a tow arm adapted for coupling by a hitch to the bicycle. The tow arm is pivotally coupled to an upper portion of the trailer frame and can be collapsed against the frame. The frame can comprise plural frame sections that can also pivot to a collapsed position and a lower shelf foldable to a collapsed position as well. Locking elements can be provided for selectively locking the trailer components against relative pivoting motion. One or more actuators for selectively locking and unlocking the frame components can be provided. One such actuator can simultaneously unlock first and second transversely spaced apart hinge elements. The hitch can comprise a flexible coupling that provides torsional resistance against rolling motion of the trailer, particularly when the trailer is mounted to a seat post or other location above the rear wheel of the bicycle. The flexible hitch coupling can provide a progressively increasing torsional resistance to such rolling while allowing pivoting of the trailer relative to the bicycle as the bicycle is steered and flexing to accommodate variations in pitch between the bicycle and trailer.