RESEARCH PAPER
Coupling forces resulting from the type of chain saw used
 
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Department of Toxicology and Occupational Health Protection, Medical University of Silesia, Public Health Faculty, Katowice, Poland
 
Ann Agric Environ Med. 2014;21(1):174–178
KEYWORDS
ABSTRACT
Introduction:
Woodcutters’ working conditions are difficult due to the presence of numerous occupational hazards. Petrol –fuelled chain saws commonly used in forestry produce vibration, which may lead to the development of non-specific disorders in the upper extremities of the chain saw operator, referred to as hand-arm vibration syndrome (HAVS). The magnitude of coupling forces exerted on a vibrating tool handle may affect the severity of HAVS and hand-wrist cumulative trauma disorders. The aim of the presented study was to measure coupling forces exerted by fellers on various chain saws and to find correlation between force magnitude and type of tool used.

Material and Methods:
Coupling forces applied by workers on different types of chain saws were measured by means of a hydro-electronic force meter. All measurements were carried out during the harvesting of wood in real work conditions.

Results:
Mean force applied by forestry workers on their tools was 44.2 N. Coupling forces registered during cutting wood with small universal chain saws were larger than forces exerted on models characterized by higher power profile. Forces applied on comparable tools produced by various manufacturers also differed.

Conclusions:
The relationship between coupling forces and power of the chain saw should lead to ergonomic improvements of the tool and vibration-reducing devices. These results can also be used as a recommendation for fellers in a range of using proper machines for different types of cut or types of wood. They may also be applicable to develop more effective methods for assessing vibration exposure risks among woodcutters.

 
REFERENCES (23)
1.
Färkkilä M, Aatola S, Starck J, Korhonen O, Pyykkö I. Hand-grip force in lumberjacks: two-year follow-up. Int Arch Occup Environ Health. 1986; 58: 203–208.
 
2.
ISO 5349–1: 2001: Mechanical vibration – Measurement and evaluation of human exposure to hand-transmitted vibration – Part 1: General guidelines. International Organization for Standardization, Switzerland, Geneva 2001.
 
3.
Bovenzi M. Exposure – response relationship in the hand-arm vibration syndrome: an overview of current epidemiology research. Int Arch Occup Environ Health. 1998; 71: 509–519.
 
4.
Bovenzi M, Zadini A. Treatment of the hand-arm vibration syndrome in Italy. Kurume Med J. 1990; (37) 129–130.
 
5.
Griffin MJ. Measurement, evaluation, and assessment of peripheral neurological disorders caused by hand-transmitted vibration. Int Arch Occup Environ Health. 2008; 81(5): 559–573.
 
6.
Pyykkö I, Farkkila M, Toivanen J, Korhonen O, Hyvarinen J. Transmission of vibration in the hand-arm system with special reference to changes in compression force and acceleration. Scan J Environ Health. 1976; 2: 87–95.
 
7.
Radwin RG, Armstrong TJ, Chaffin DB. Power hand tool vibration effects on grip exertions. Ergonomics. 1987; 30 (5): 833–855.
 
8.
Bovenzi M, Lindsell CJ, Griffin MJ. Acute vascular responses to the frequency of vibration transmitted to the hand. Occup Environ Med. 2000; 57: 422–433.
 
9.
Aldien Y, Marcotte P, Rakheja S, Boileau PE. Influence of hand-arm posture on biodynamic response of the human hand-arm exposed to zh-axis vibration. Int J Ind Ergon. 2006; 36: 45–59.
 
10.
McDowell TW, Wiker SF, Dong RG, Welcome DE, Schopper AW. Evaluation of psychometric estimates of vibratory hand-tool grip and push forces. Int J Ind Ergon. 2006; 36: 119–128.
 
11.
Hutton SG, Paris N, Brubaker R. The vibration characteristics of chain saws and their influence on vibration white finger disease. Ergonomics. 1993; 36: 911–926.
 
12.
Hartung E, Dupuis H, Scheffer M. Effects of grip and push forces on the acute response of the hand-arm system under vibrating conditions. Int Arch Occup Environ Health. 1993; 64: 463–467.
 
13.
Riedel S. Consideration of grip and push forces for the assessment of vibration exposure. Cent Europ J Publ Health 1995; 3: 139–141.
 
14.
ISO 15230: 2007. Mechanical vibration and shock – Coupling forces at the man- machine interface for hand-transmitted vibration. International Organization for Standardization, Switzerland, Geneva 2007.
 
15.
Dong RG, Welcome DE, Wu JZ. Estimation of biodynamic forces distributed on the fingers and the palm exposed to vibration. Ind Health. 2005; 43: 485–494.
 
16.
Harazin B, Szłapa P. Measurement of coupling forces applied to vibration tools in industry. Proceeding of the 34 th Meeting of the UK Group of Human Response to Vibration, Dunton, Essex, England, 1999: 111–117.
 
17.
Malinowska-Borowska J, Harazin B, Zieliński G. The influence of wood hardness and logging operation on coupling forces exerted by lumberjacks during wood harvesting. Int J Ind Ergon. 2011; 41: 546–550.
 
18.
Harazin B, Szlapa P. Calibration system for pressure force meter used for measurement of forces acting onto tools, Polish patent application PL 380603, filed September 2006.
 
19.
Harazin B, Szłapa P. Malinowska J. Calibration method for a pressure force meter. Polish patent application PL 380602, filed September 2006.
 
20.
Scalise L, Concettoni E, Deboli R, Calvo A, Rapisarda V. Simultaneous measurement of acceleration, grip and push force on chain saw for forestry: correlation with hemodynamic parameters. 11 th International Conference on Hand-Arm Vibration, Bologna, Italy, 3–7 June 2007: 465–472.
 
21.
Gwosdz F. Presentation on coupling forces. General committee document N 220, International Organization for Standardization ISO, Technical Committee 108 Subcommittee SC 4, Working group WG 3, published 10.2010.
 
22.
Wójcik K, Skarżyński G. The impact of work technique during timber cutting on vibrations and forces on I.C.E.- powered sawing machine grips. Inżynieria rolnicza 2008; 1(99): 425–431.
 
23.
Parker R, Sullman M, Kirk P, Ford D. Chainsaw size for delimbing. Ergonomics. 1999; 42 (7): 897–903.
 
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