Abstract: A sprocket wheel having replaceable teeth includes a wheel body, a plurality of replaceable teeth, and fixing members to fix each tooth to the wheel body. In the outer periphery of the wheel body are formed a plurality of notches regularly spaced from each other. Each replaceable tooth consists of a central portion which forms a tooth groove on the upper surface and which fits into the notch of the wheel body, and two flanges formed in right and left sides of the central portion. The right and the left flanges can be formed ahead of and behind the central portion of the tooth respectively. Each fixing member can consist of an internal thread formed in each flange of the tooth, a bolt hole formed in each side of the notch, and a bolt having a head thinner than the flange.

Abstract: A chain for a V-pulley which is used by being endlessly trained between a pair of V-pulleys and in which blocks each having an end surface for coming into contact with the V-pulley are respectively disposed on the outer sides of outer link plates. The end surface of the block is formed into a convex surface constituted by the whole or part of a conical surface which has substantially the same apex angle as that of the inner wall of the V-pulley and has an axis parallel to the axis of a connecting pin. The block may be fixed with respect to the outer link plate or may be made rotatable about the axis of the cone.