PROBLEM TO BE SOLVED: To provide a fishing sinker preventing rolling and dropping caused by rolling around its central axis when put on an inclined surface on the ground and a boat, and having a shape and a structure easily inverted together with a float to prevent root-hooking under water.SOLUTION: The rolling-preventing inverted sinker is formed by bringing, in a sinker whose head part includes a spheroid including a sphere, and on a plane 14 intersecting with the spheroid by passing through any point A in the vicinity of an engagement attaching part, two points at the top of the maximum diameter in the perpendicular direction in the projection of the central axis 13 in the spheroid cross sectional outer form to be points B and C, and bringing the points A, B and C to be able to contact with the plane as contact points, and at the same time, bringing, in a transverse plane projection, the trajectory of the contact point moving from the point B or C to the top of the head part to be formed in almost an arc contacting onto a line including the production of the transverse plane projection of the line AB or the line AC.COPYRIGHT: (C)2012,JPO&INPIT【課題】本発明は魚釣りの錘であって、陸上や船上の斜面に置いたときに中心軸まわりの回転による転がり落下を防ぎ、水中では根掛かりを防ぐために浮子と併用して倒立し易い形状と構造の錘を提供する。【解決手段】頭部が球体を含む回転楕円体で成る錘において、係止取付部近傍の適宜の点Aを通って前記回転楕円体と交差する平面14上で、前記回転楕円体断面外形における中心軸13の投影に垂直方向の最大径頂点の2点を点B、Cとして、該点A、B、Cが接地点として平面に接することが可能に形成し、かつ、正面投影において点B、Cから前記頭部頂点に移行する接地点の軌跡が、線AB又は線ACの正面投影の延長線を含む線上で接する略円弧で形成されたことを特徴とする転がり防止倒立型錘とする。【選択図】図2
