STP1133

    Energy as Performance Criterion for Chain Saw Protective Clothing

    Published: Jan 1992


      Format Pages Price  
    PDF (364K) 14 $25   ADD TO CART
    Complete Source PDF (18M) 14 $91   ADD TO CART


    Abstract

    In North America, the performance of chain saw protective leggings and footwear is actually evaluated by measuring the threshold stopping speed (TSS) of a gas-powered chain saw. The TSS is an index value that permits a rating of the performance of the protective clothing. The TSS is the greatest chain or motor speed at which no cut-through occurs, measured before the cutting action of the chain takes place. The speed could be related to the power of the motor but the speed is changing rapidly as is the power. Thus, it is difficult to calculate the energy dissipated by the protective clothing.

    In order to improve the testing method and to calculate the energy supplied by the motor, a test rig has been perfected. It consists of an electric chain saw (1,4 kW), a support for protective footwear and an electronic data acquisition system. The following data are collected: voltage, current, speed of the motor and cut-through time if any cut-through. All tests are monitored on a high speed video camera.

    Seven types of protective footwear and three types of protective pads have been tested. The energy supplied by the motor ranges from 6 joules to 870 joules. The measurement of energy allows a better classification because the relative range of the values (6 to 800 joules) is larger than the one of TSS (10,7 to 13,5 m/s). The energy having a defined zero, integrating TSS and cut-through time criteria and being continuously measurable seems to be a better performance criterion.

    Keywords:

    chain saw, protective footwear, leg protection, performance criterion, energy measurement


    Author Information:

    Arteau, J
    Research engineers, Institut de recherche en santé et en sécurité du travail du Québec (IRSST), Montréal, Québec

    Turcot, D
    Research engineers, Institut de recherche en santé et en sécurité du travail du Québec (IRSST), Montréal, Québec


    Paper ID: STP19199S

    Committee/Subcommittee: F23.60

    DOI: 10.1520/STP19199S


    CrossRef ASTM International is a member of CrossRef.