Patent ID: 11925130
Assignee: SAKAMOTO SEIKI CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC A  B | IPC A

Claim 0:
1. A piercing tool, comprising:
a distal end portion, which has a cylindrical shape, and is to be first brought into abutment against an object; and
a main body portion, which has a cylindrical shape at at least a part of the main body portion, and has one end portion to which the distal end portion is mounted,
wherein the distal end portion is removably mounted to the one end portion of the main body portion, and has an inner peripheral surface having a female thread formed at an end portion of the distal end portion on a side to be mounted to the main body portion,
wherein the main body portion has an outer peripheral surface having a male thread formed so as to be engaged with the female thread at the end portion of the main body portion on a side to which the distal end portion is mounted,
wherein the distal end portion has a Rockwell hardness higher than a Rockwell hardness of the main body portion,
wherein the male thread includes an incomplete thread portion formed in an inner end portion area away from the one end portion of the main body portion, and
wherein the incomplete thread portion is a portion that engages with a part of the female thread of the distal end portion in a non-normal state, and is formed in a shape in which valleys of the male thread become shallower as being away from the one end portion of the main body portion.