Abstract
The handtool discussed in this paper is a kind of adjustable wrench which is roughly of the same type as the widely used monkey wrenches and pipe wrenches. In order to establish design methods, fundamental characteristics of this kind of adjustable wrench were theoretically studied. The wrench was modified as a linkage having five straight links. Three clamping forces acting on a circular cylinder as a bung were calculated numerically by means of the electric computer when varying the diameter of the circular cylinder and the length of two of the five links. As a result, fundamental characteristics of this type of adjustable wrench were ascertained in this paper.
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