Bicycle Seat Clamp Assembly with Rotational Post Adjustment
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Solution Overview
Problem
Existing bicycle seat clamp assemblies have limited front-to-back adjustment and tilt range, are cumbersome to operate, and often require multiple sizes to fit different rail dimensions, compromising rider comfort and power output.
Innovation Solution
A bicycle seat clamp assembly with vertical clamping forces actuated by a horizontal fastening device, allowing for adjustable tilt and rotation of the seat post, accommodating various rail sizes and enabling optimal rider positioning with a universal fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If side clamping seat clamp assemblies are used to fit one rail size, then the clamping mechanism is simplified, but the adaptability to different rail sizes is reduced
Solution Approach 1:
The seat clamp assembly uses vertical clamping forces applied by upper and lower members to clamp down on the rails, rather than side clamping. This vertical clamping mechanism can accommodate multiple rail sizes (e.g., 7x9mm oval rails, 7mm round rails) with a single clamp assembly design, making the device universal and adaptable to different rail dimensions without requiring multiple specialized clamp assemblies
2Reliability
If knurled curved surfaces are used to prevent inadvertent angular movement, then the seat is secured at set tilt angles, but the ease of adjustment is reduced
Solution Approach 1:
The seat clamp assembly allows the seat to be adjusted to various tilt angles within a wide range during installation and use. The fastening device can be loosened and tightened at different angular positions, enabling dynamic adjustment of the seat tilt angle according to rider preference. The knurled surfaces provide friction to maintain the selected angle during normal use, while allowing intentional adjustment when needed
3Ease of manufacture
If straight section rails of set length are used, then the manufacturing is simplified, but the front-to-back adjustment range is limited
Solution Approach 1:
The seat post is made rotatable about a pivot axis, allowing the rider to dynamically adjust the front-to-back position of the seat by rotating the seat post. This rotational capability provides an extended adjustment range beyond what fixed-length straight rails would allow, while the rails themselves remain simple straight sections that are easy to manufacture. The rotation mechanism enables the seat to be positioned optimally for different rider geometries without requiring complex rail designs
4Manufacturing precision
If multiple sized clamp assemblies are manufactured for different rail sizes, then the fit precision is improved, but the device complexity and inventory requirements increase
Solution Approach 1:
A single seat clamp assembly design with vertical clamping members can accommodate multiple rail sizes and types (oval, round, different dimensions) through proper selection of upper and lower member dimensions. This universal design eliminates the need to manufacture and maintain inventory of multiple specialized clamp assemblies, reducing device complexity while maintaining precise fit for various rail configurations
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 solution provides a wide range of front-to-back adjustment and tilt angles, ensuring optimal rider positioning and comfort, while being easy to operate and adaptable to various rail sizes, enhancing power output and user convenience.
Implementation Method 1
The frustoconical surfaces convert horizontal fastening device movement into vertical clamping force through mechanical wedge action
Implementation Method 2
These knurls mitigate inadvertent front to back angular tilting of the seat
Data Source
AI summary
A bicycle seat clamp assembly is disclosed herein which comprises upper and lower members to provide a vertical clamping force to the rails of a seat to attach a seat to the seat post. The upper and lower members are actuated by a horizontal fastening device which can be tightened or loosened with one hand. The bicycle seat clamp assembly provides for fine tuning of a front to back angular tilt as preferred by the user. Moreover, the seat post can be rotated to the forward direction or the rearward direction to increase a front to back adjustment range of the seat.