The purpose of this study is to investigate the usability evaluation of grasps of detergent bottles. The results revealed the following three points: (1) Four fingers could be inserted into the handle clearance area of a detergent bottle that was estimated to be easy to pour. (2) When grasping the handle of bottles, the hand width, (finger 2 to 5 distal joint breadth) was found to be 1.03 times wider than a hand with fingers outstretched. (3) The distance between the center of gravity and the center of rotation of the bottle influenced its usability. When the entire contents of the bottle were poured a bottle with sloping shoulders provided better usability than a bottle with square shoulders.

View full abstract

We developed a comfortable and safe shampoo system while paying special attention to the posture of clients, considering shampoo techniques of beauty salon. Then we evaluated comfort factors of clients subjectively, physiologically and physically. Firstly, we started to search human factors related to shampoo system to establish the comfortable shampoo posture. By analyzing those data and testing further, we realized that some design parameters of shampoo system could be converged and applicable to a wide range of clients. Consequently, we developed new SRSS (Sectioned Rear-rest and Sliding Seat) shampoo system, which has following mechanisms. 1) Fixed upper portion of rear-rest 2) at slides to front and back 3) sorb clients’ sitting height by adjusting the space between a lower portion of sectioned rear-rest and a seat. As a result of these, SRSS system can accept approximately 95% of Japanese adults’ height. Through the final evaluation, we got nice test results from both subjective and physiologic aspects. And we could distribute client’s weight to the neck, shoulder and back, regardless of client’s body size, thus we reduced pressure to the neck.

View full abstract