The Ergonomic Study of the Handlebar of the Craft Knife Chih-Chun Lai Chun-Ming Lien Wen-Shan Chang 45 30 (180 ) ABSTRACT The study will propose an innovated craft knife handlebar design, in addition, carry out the subjective assessment of users comfort levels of holding different craft knife handlebars to understand various handlebar types and the different angles on users comfort levels and working efficiencies, when users are operating craft knife. The results of the study are for the reference of future designs of new craft knife handlebars. It is found from the results of the experimental subjective assessment and statistic test that the new-type craft knife handlebar angles of handle had significant influence on the objective measures ofsawing performance. Overall, the optimal combination of the anterior handle was 45, the second was 30, and the worst was (180 ). KeywordsWristPen anglecumulative Trauma Disorders (CTD)Craft Knife 1 39
( 85 ) [1] 1 (instantaneous trauma) (cumulative traumadisorder CTD ) (carpal tunnel syndrome) (nerve entrapment) (tenosynovitis) (peritendinitis )(trigger finger) (neuritis) Kurppa, Wari and Rokkanen, 1979[2], Armstrong, Foulke, Joseph, Goldstein, 1982[3], 89 [4] 39 2
1/8 ; [5]( 3.2mm c. 85 ) ( ) 2/3[6] U. S. Department of Health and Human Services 1989 "Carpal Tunnel Syndrom-Slected References" 1 [8]( 87 ) (Silverstein, 1986)[7] ( 87 ) 64 [8] ( 1) a. b. 3 39
(Tip-to-tip Pinch) (Two-point Pinch) (Three-point Pinch) (Lateral Pinch) ( 4) 3 Skerik and colleagues (1971) (Gross Grips) (Power Grip) (Hook Grip) 1 (. ) 2 (.. ) 3 ( ) 1 ( ) 2 ( 39 4
) (5) ( 87 ) [8] 0 5 39
(180 )15 John Bennett(1980) 19 5[10]Schoenmarklin Marras 2040 (1989a[11],1989b[12]) 2. 1. 3. a. b. c. d. e. f. g. 12cm1c( 0.5cm~1.2cm 10cm 11.5cm~12cm) (independent variables) 45 (dependent variables 8 45 0 15 39 6
45 15 4. (1) A. a. c. d. e. B. 3 16 abc a 90 b ( 10 ) c ( 9 ) C. a b ( 0) a 7 39
c a bcd 2 d 15 30 45 : (1) 3 3.70 :0.5489 12 ( (2) 8.1 111213 ) 0.6024 (3) :6.90 :0.5398 3 4 ( 0 15 30 45 ) 3cm 90 abc d abcd 0 ( 1) 1 30 35 40 20 1 2 45 30 40 40 3 30 25 0 10 8 4 0 35 10 20 ( )21.63 0.52 5 20 40 0 15 6 0 25 40 25 167.5 4.17 62.25 7 10 25 0 40 9.48 8 10 10 25 20 39 8
2 b (9.23406) T T (P=0.007) a b b 3 15 F 355.208 4 88.802 0.999 0.521 266.667 3 88.889 30 621.875 7 696.875 4 174.219 0.871 0.568 600.000 3 200.000 45 1296.875 7 683.333 4 170.833 1.922 0.309 266.667 3 88.889 950.000 7 P > (0.05) (4) 9 39
[1] 85 19-29 [2] Kurppa, K., Wari, P., Rokkanen, P., 45 45 1979, Peritendinitis and Tenosynovitis: a Review, Scand. J. [3] Armstrong, T., Foulke, J., Joseph, B., Goldstein, S., 1982, Investigation of Cumulative Trauma Disorders in a Poultry Processing Plant, AIHAJ, 14 Work Environ. Health 5, pp. 19-24. 43(2), pp.103-116. [4] 89 318 45 [5] 85 IOSH84-H325 [6] 43-58 [7] Silverstein, B.A., Fine, L.J. and Armstrong, T.J., 1986, Hand Wrist Cumulative Trauma Disorders in Industry,Br J Ind Med Vol. 43, pp. 779-794. [8] 87 39 10
101-111 [9] 90 http://www.edu.tw/edu_web/edu _MGT/PHYSICAL/EDU7663001/he alth/eyesight/eyes/book.htm [10] Emanuel, J., Mills, S., and Bennett, J., 1980, In search of a better handle, Proceedings of the Symposium: Human Factors and Industrial Design in Consumer Products. Medford, MA: Tufts University. [11] Schoenmarklin, R., and Marras, W, 1989a, Effect of handle angle and work orientation on hammering:. Wrist motion and hammering performance. Human Factors, 31(4), pp.397-411 [12] Schoenmarklin, R., and Marras, W, 1989b, Effect of handle angle and work orientation on hammering:. Wrist motion and hammering performance. Human Factors, 31(4), pp.413-420. 11 39