Impact tool head assembling mechanism

An impact tool head assembling mechanism, comprising:

• an engaging sleeve, being disposed on a front end of an impact tool, including a tubular wall and at least one projection, the tubular wall defining an axial direction, the at least one projection being protrudingly and retractably disposed on an inner face of the tubular wall;
• an impact tool head, including a rod body and a flange radially protruding from the rod body, the flange including an inclined surface facing toward the front end and an outermost peripheral edge, a contact position being defined as a position where the inclined surface contact with the at least one projection:
• wherein a reference plane is defined as passing through the outermost peripheral edge and perpendicular to the axial direction, and an included angle between a line which is from the contact position to the outermost peripheral edge and the reference plane is between 25 and 65 degrees;
• wherein the inclined surface and the at least one projection are in point contact;
• the at least one projection is a ball member, the ball member has a diameter from 6 mm to 10 mm;
• the inclined surface includes a peripheral edge, a distance between the peripheral edge and the outermost peripheral edge is from 1.5 mm to 5.0 mm;
• a distance between the contact position and the outermost peripheral edge is from 0.75 mm to 2.5 mm.

An impact tool head assembling mechanism, comprising:

• an engaging sleeve, being disposed on a front end of an impact tool, including a tubular wall and at least one projection, the tubular wall defining an axial direction, the at least one projection being protrudingly and retractably disposed on an inner face of the tubular wall;
• an impact tool head, including a rod body and a flange radially protruding from the rod body, the flange including an inclined surface facing toward the front end and an outermost peripheral edge, a contact position being defined as a position where the inclined surface contact with the at least one projection:
• wherein a reference plane is defined as passing through the outermost peripheral edge and perpendicular to the axial direction, and an included angle between a line which is from the contact position to the outermost peripheral edge and the reference plane is between 25 and 65 degrees;
• wherein the included angle is 45 degrees;
• wherein each of the at least one projection is a ball member, as viewed in the axial direction, a ratio of a distance between the contact position and the outermost peripheral edge to a radius of the at least one projection is between 0.1 and 0.6;
• the inclined surface is a linear surface, and the linear surface has a slope between 0.5 and 3.0;
• the hardness of the at least one projection is greater than the hardness of the flange;
• the engaging sleeve includes a plurality of projections which are peripherally separately disposed on the inner face;
• the inclined surface and a respective one of the plurality of projections are in point contact;
• the ball member has a diameter from 6 mm to 10 mm;
• the contact position and a distance between the outermost peripheral edge is from 0.75 mm to 2.5 mm;
• the inclined surface includes a peripheral edge, a distance between the peripheral edge and the outermost peripheral edge is from 1.5 mm to 5.0 mm;
• the engaging sleeve further includes a receiving hole expanding toward the front end, the impact tool head further includes an abutting surface receivable within the receiving hole, a shape of the abutting surface and a shape of the receiving hole are complementary with each other;
• the impact tool head further includes a concavity between the rod body and the inclined surface, and the concavity has a radius of curvature less than or equal to 5 mm;
• as viewed in the axial direction, at least one third of the at least one projection overlaps the inclined surface;
• the inclined surface includes a lower peripheral edge, and a distance between the lower peripheral edge located below the peripheral edge in the axial direction, and the contact position is less than or equal to 0.75 mm;
• a diametric dimension of the flange is 1.3 to 1.8 times a diametric dimension of the rod body.