Document Type

Undergraduate Project

Date of Degree Completion

Spring 2018

Degree Name

Bachelor of Science

Department

Mechanical Engineering Technology

Committee Chair

Dr. Craig Johnson

Second Committee Member

Professor Roger Beardsley

Third Committee Member

Professor Charles Pringle

Abstract

Removal of a bicycle cassette requires additional tools to hold the cassette in place while loosening the cassette lockring. Typically a tool called a chain whip is used to stabilize the cassette, but is difficult to quickly and correctly apply to the cassette. Due to the need for an additional tool to hold the cassette, the user is faced with utilizing both hands while still needing to somehow hold the wheel in place. The lockring is torqued relatively tight and the overall combination of force, ergonomics, and number of tools required makes the task difficult to perform quickly. The objective was to create a device that simultaneously holds the cassette in place while also loosening the lockring thus eliminating the need for a chain whip. This device also utilizes a gear set to reduce user imputed toque. By using the cassette’s mechanical function of non-clockwise free rotation in relation to the wheel itself, a stable motionless platform is created to apply a moment in clockwise direction while a torque multiplying gear set converts the clockwise rotation to counter clockwise rotation which loosens the lockring. User applied torque is reduced by 50% compared to traditional methods. The device also increases the ergonomics of the task and improves overall task completion time by 33%. Eliminating the use of a separate cassette holding tool improves simplicity of the task.

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