Abstract
The purpose of this thesis is to study the influence of the thickness of flat objects on people’s grip ability, by means of the measurement of the grip’s performance time. Observing how people grip the given flat objects, I want to come up with the better strategies in terms of the thickness of the gripped objects. In order to accomplish the above objective, I compose a series of questionnaires for the tested people, which compares differences before and after the test. On the basis of the result of my experiment, I attempt to provide some guidelines for people in terms of their subjective and objective difference. The range of my research object is confined to the diametrically 44 mm-sized round objects. There are thirty normal participants, each of whom is given seven object’s levels tested for six times in a random order. This experiment totally amounts to 1260 data, which are recorded by Digital Video in terms of every motion of people’s grip, and succeeded with an analysis related to people’s grip ability. I reach some conclusions that follow (and that may be taken as references for the designers of product design and people related): 1. The formula of People’s grip ability and flat object’s thickness is { ;0<thickness≦20}. People’s grip ability gets even weaker when the thickness of the object is below 3.1 mm; however, it gives more access for people’s ability to grip when the thickness of the flat object is above 5.3 mm. 2. Male’s grip ability is no difference with Female’s in terms of flat object on plane. 3. When given various flat objects, the following two strategies are recommended: a. Simultaneous (S), Both finger force (Bf) and Middle-ring finger grip (Mrg); b. Simultaneous (S), Both finger force (Bf) and Supported grip (Sg). 4. One can subjectively tell the difference of the thickness of the flat objects only when the difference is significant. 5. There is no significant deference between male and female in subjective judgment on the thickness of flat objects. Keywords: Grip, Grip ability, Grip strategy, Product design