Balance Bike Frame Layout With Adjustable Offset Connecting Tube
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Solution Overview
Problem
Existing draisines lack design flexibility and efficiency in adjusting the distance between the seat tube and the steering unit, leading to limitations in comfort and maneuverability.
Innovation Solution
The draisine design features a connecting tube with a longitudinal axis perpendicular to the rear wheel's axis of rotation, allowing the seat tube and steering unit to be offset and adjustable in length, with telescopic and foldable options, enabling various driving positions and compact storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the connecting tube is arranged offset laterally to the seat tube (conventional design), then the structure is simple, but design freedom is limited due to required recesses or passages at connection points
Solution Approach 1:
The connecting tube's longitudinal axis is arranged in a plane of symmetry of the rear wheel that is perpendicular to the axis of rotation of the rear wheel, representing a dimensional reorientation from conventional lateral offset. This spatial reconfiguration eliminates the need for recesses or passages at connection points, thereby increasing design freedom without proportionally increasing structural complexity
2Ease of operation
If the distance between seat tube and steering unit is fixed, then the structure is simple, but comfort and maneuverability are limited
Solution Approach 1:
The connecting tube incorporates telescopic adjustment capability, allowing the distance between the seat tube and steering unit to be dynamically changed. This enables the frame to adapt to different riding positions and rider preferences, improving comfort and maneuverability while maintaining relatively simple structural implementation through telescopic mechanisms
3Adaptability or versatility
If the connecting tube is made telescopic and adjustable, then adjustment flexibility is improved, but device complexity increases
Solution Approach 1:
The connecting tube employs telescopic sections that can be adjusted to different lengths and locked in position, providing continuous or stepped adjustment flexibility. This dynamic structure allows the tube to adapt to various configuration requirements while the telescopic design itself remains a relatively simple mechanical solution
Solution Approach 2:
The connecting tube is divided into multiple telescopic sections that can slide relative to each other, with each section contributing to the overall adjustability. This segmentation allows for compact storage when collapsed and extended configuration when needed, providing high adaptability without requiring an entirely complex mechanical system
Data Source
Figure 1(a)~1(b)
Figure 2~3(b)
Figure 4(a)~4(b)
AI summary
The invention relates to a draisine (1; 1a), in particular a running wheel, comprising a straight seat tube (2), a steering unit (3), and a tube (4; 4a) for connecting the seat tube (2) and the steering unit (3). According to the invention, the seat tube (2) and the connecting tube (4; 4a) are arranged offset from one another. In one embodiment of the invention, the connecting tube (4; 4a) is removable. Advantageously, the connecting tube (4) is provided to be adjustable in length, in particular telescopically. In one embodiment of the invention, the position of the seat tube (2) and/or the steering unit (3) can be changed along the connecting tube (4; 4a).