Impact tool head
An impact tool head is provided and configured to be disposed on a front end of an impact tool. The impact tool head includes: a rod body and a flange radially protruding from the rod body. The flange includes an inclined flat surface facing toward the front end and an outermost peripheral edge. A contact position is defined as a position where the inclined flat surface contact with at least one projection of the impact tool. Wherein each of the at least one projection is a ball member, and 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.
1 . An impact tool head configured to be disposed on a front end of an impact tool, the impact tool head including:
a rod body extending in an axial direction; and
a flange radially protruding from the rod body, the flange including:
an inclined flat surface facing toward the front end; and
an outermost peripheral edge connected to the inclined flat surface, and
a contact position being defined as a position where the inclined flat surface contacts with at least one projection of the impact tool;
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;
wherein a projection length of the inclined flat surface on the axial direction is defined as a first length, and in the axial direction the outermost peripheral edge has a second length smaller than the first length.
2 . The impact tool head of claim 1 , 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.
3 . The impact tool head of claim 2 , wherein the included angle is 45 degrees.
4 . The impact tool head of claim 3 , wherein the inclined flat surface is a flat surface, and the flat 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 inclined flat surface and the at least one projection 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 flat surface includes an upper peripheral edge, the distance between the upper peripheral edge and the outermost peripheral edge is from 1.5 mm to 5.0 mm; the impact tool head further includes a concave surface between the rod body and the inclined flat surface, and the concave surface has a radius of curvature less than or equal to 5 mm; the impact tool head further includes an abutting surface between the rod body and a side of the flange opposite to the inclined flat surface, the abutting surface is configured to be abutted against the impact tool and has a radius of curvature which is larger than the radius of curvature of the concave surface; as viewed in the axial direction, at least one third of the at least one projection overlaps the inclined flat surface; the inclined flat surface includes a lower peripheral edge, and a distance between the lower peripheral edge 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.
5 . The impact tool head of claim 1 , wherein the inclined flat surface is a flat surface, and the flat surface has a slope between 0.5 and 3.0.
6 . The impact tool head of claim 1 , wherein the inclined flat surface and the at least one projection are in point contact.
7 . The impact tool head of claim 1 , wherein the ball member has a diameter from 6 mm to 10 mm, and the distance between the contact position and the outermost peripheral edge is from 0.75 mm to 2.5 mm.
8 . The impact tool head of claim 1 , wherein the inclined flat surface includes an upper peripheral edge, a distance between the upper peripheral edge and the outermost peripheral edge is from 1.5 mm to 5.0 mm.
9 . The impact tool head of claim 1 , further including a concave surface between the rod body and the inclined flat surface, wherein the concave surface has a radius of curvature less than or equal to 5 mm.
10 . The impact tool head of claim 9 , further including an abutting surface between the rod body and a side of the flange opposite to the inclined flat surface, wherein the abutting surface is configured to be abutted against the impact tool and has a radius of curvature which is larger than the radius of curvature of the concave surface.
11 . The impact tool head of claim 10 , wherein the first length is 2.5±0.05 mm, the second length is 2.1±0.05 mm, and the abutting surface has a radius of curvature less than or equal to 10 mm.
12 . The impact tool head of claim 1 , wherein as viewed in the axial direction, at least one third of the at least one projection overlaps the inclined flat surface.