Trial for scheme design of machine considering inherently safe design measure

Abstract

It is shown that only inherently safe design measure, which is defined in ISO 12100 as protective measure which either eliminates hazards or reduces the risks associated with hazards by changing the design or operating characteristics of the machine without the use of guards or protective devices, can eliminate hazards or reduce the severity of risks. However, mechanical designers actually apt to use safe guards and other measures because they do not have concrete design methods to apply them. In the consequence the machine does not have adequate inherently safe design measures. This paper proposes the process of scheme design for newly designed machinery to adhere adequate inherently safe design measures and other safe measures. Scheme design process consists of four stages, required specification definition, function definition, component and mechanism choice and structure design. These four stages are in order of consideration. The 14 items of inherently safe design measures those are classified according to their contents are shown in ISO12100. And each of them is suitably assigned to each stage of design process according to its content. Each stage study is narrowed down and clarified by this assignment. This process is proceeded in the matrix table to get adequate and less omission design by comparing and evaluating various ideas that can be thought of. By this proposal, front loading design process is implemented and the machinery design will obtain adequate inherently safe design measures and other safety methods.

Keywords

• inherently safe design measure
• safety method
• design method
• design process
• mechanical design
• scheme design
• front loading design process