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URN etd-0825106-201202 Statistics This thesis had been viewed 3334 times. Download 3856 times. Author Wan-Fu Huang Author's Email Address No Public. Department Industrial Design Year 2005 Semester 2 Degree Master Type of Document Master's Thesis Language Chinese&English Page Count 132 Title A Study on the Design of 『Knee Kicker』 Bumper for Carpet Layer Keyword Knee Kicker Bumper design measurement device measurement device Bumper design Knee Kicker Abstract Carpet layers often use knee kickers for comprehensive floor carpet laying. They are more prone to occupational knee injuries than other laborers by 108 times. Change of operational approaches or the use of appropriate protective equipment helps reduce risk factors. Tool improvement is another feasible option. When it comes to knee kickers, improving the Bumper is one of the most effective methods, and it is necessary to design a simple and suitable gauging mechanism for measuring the characteristics of the Bumper.
An improved pendulum-type impact test platform is employed to examine the mechanical transmission and rebound of the Bumper of the knee kicker when it sustains impacts. The maximum impact force (impetus), impulse, and elasticity restoration coefficients serve as indicators for assessing the Bumper. Preliminary study confirms the feasibility of the measurement device designed by the researchers. In the area of Bumper design enhancement, Bumper material hardness, the geometrical configuration of the contact surface, and the assembly method are employed as independent variables for the experiment. Through the blind borehole method, the new Bumper (featured by a nonlinear combination in conjunction with a geometrical shape contact surface to make it softer at the knee contact end) is designed. The optimal balance between the rebound and the effective force passed forward is obtained. Work efficiency and safety are also treaded as the principles for developing the new Bumper.
In terms of the maximum effective force transmitted, the new Bumper outperforms the one adopting old designs. No significant improvement is noted in the impulse and the geometrical configuration of the contact surface. Improving the radian of the Bumper enlarges the contact surface to dissipate the peak pressure at the knee area.
Samples of the improved product are tested by a US manufacturer, and the outcome of users’ subjective evaluation is promising. Following proper enhancement, this test device can be applied to the appraisal of the buffering characteristics of hand tools, packaging equipment, cushions, shoe pads, handles and so on, as well as to new product design and development.
Advisor Committee Chih-Fu Wu - advisor
Chih-Yuan LO - co-chair
Jui-Che Tu - co-chair
Files Date of Defense 2006-07-26 Date of Submission 2006-08-26