Bicycle Quick-Release Shaft With Interchangeable Threaded Cylinder

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Solution Overview

Problem

The existing quick-release devices for bicycles require multiple shafts with different threads and lengths to accommodate various bicycle frames, leading to increased production costs due to the need for custom designs and sizes.

Innovation Solution

A quick-release device featuring a hollow shaft with a detachable threaded cylinder and inner sleeve, where a bolt locks the threaded cylinder to the shaft, allowing for interchangeable threads and adjustable length using connecting holders.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple shafts with different threads and lengths are produced to match various bicycle frames, then the adaptability to different bicycle frames is improved, but the production cost and device complexity increase

Engineering Contradiction:

Improveadaptability to different bicycle framesVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The shaft is divided into a base shaft and interchangeable threaded cylinders. The threaded cylinders can be detached and replaced to match different bicycle frame threads, allowing one shaft to serve multiple purposes without requiring multiple custom shaft designs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The base shaft is designed with a universal interface that can accommodate different threaded cylinders. This universal design allows a single shaft to work with various bicycle frame types by simply changing the threaded cylinder, eliminating the need for multiple specialized shafts.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If multiple shafts with different threads and lengths are produced to match various bicycle frames, then the adaptability to different bicycle frames is improved, but the production cost increases

Engineering Contradiction:

Improveadaptability to different bicycle framesVSAvoidproduction cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

By segmenting the shaft into a base shaft and interchangeable threaded cylinders, the manufacturing cost is reduced. The base shaft can be produced once with a standardized interface, and only the threaded cylinders need to be varied to match different bicycle frames, rather than producing entirely different shafts for each application.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The universal base shaft design allows a single standardized component to serve multiple functions across different bicycle frame types. This universality reduces the total number of unique parts that need to be manufactured, thereby lowering overall production costs.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If multiple shafts of different sizes are prepared to match the wheelbase of the bicycle frame, then the adaptability to different wheelbases is improved, but the production cost increases greatly

Engineering Contradiction:

Improveadaptability to different wheelbasesVSAvoidproduction cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The shaft is segmented into a base shaft and interchangeable threaded cylinders with different lengths. This allows the wheelbase to be adjusted by changing the threaded cylinder length rather than producing entirely different shafts for each wheelbase requirement, significantly reducing production costs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The shaft system becomes dynamically adjustable through the interchangeability of threaded cylinders. Different lengths of threaded cylinders can be attached to the base shaft to match different wheelbase requirements, providing flexibility without requiring multiple fixed shaft designs.

Inventive Principle:

Principle #15Dynamics

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

This design enables the use of a single shaft with different threads and lengths, reducing manufacturing costs and allowing consumers to customize the device for various bicycle frames, thereby simplifying production and use.

Implementation Method 1

the bolt presses and locks the threaded cylinder and the shaft

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Implementation Method 2

The external thread 11 is screwed to a screw hole of a bicycle frame

Methodology Applied

Scientific EffectScrew connection: Screw

Data Source

PatentUS11505276B2Quick-release device for bicycle

Publication Date: 2022.11.22 FUL CHEE ENT CO LTD

AI summary

A quick-release device for a bicycle includes a shaft having a locking assembly at one end and an inner sleeve in another end. The inner sleeve is kept a distance apart from an end edge of a through hole of the shaft to form an inner annular trough portion at an outer end of the through hole. A threaded cylinder is insertedly connected to the inner annular trough portion. A perforation is defined in the threaded cylinder. One axial end of the threaded cylinder has a cylindrical flange. The cylindrical flange is insertedly connected to the inner annular trough portion of the shaft. A bolt is insertedly disposed in the perforation of the threaded cylinder. The bolt passes through the perforation and is inserted into the shaft to be screwed to the inner sleeve, so that the bolt presses and locks the threaded cylinder and the shaft.