| 主权项 |
1. An anti-disengagement structure of a tool head for a fastener, for insertion into an insertion recess of the fastener to fasten or unfastening the fastener, the tool head including a main body, the main body having an operation portion and a working portion, the working portion axially integrally extending from one end of the operation portion, a top end of the working portion having an end face, at least two abutting faces extending from a periphery of the end face toward the operation portion, a depth of each of the abutting faces corresponding to one said insertion recess being defined as a working inserting section, the largest outer extent of the working inserting section being smaller than or equal to the largest inner extent of the insertion recess, at least one said abutting face corresponding to the working inserting section being formed with at least one groove, the groove being entirely filled with an elastic member, part of the elastic member being protrusive outside the groove and exposed beyond the abutting face, the largest extent from the exposed part of the elastic member to another abutting face being greater than the largest inner extent of the insertion recess;
wherein the groove has a rugged surface, and the elastic member is fixedly attached to the rugged surface. |
