| 摘要 |
A holder for grooving work includes a shank portion, and a head portion located on an end portion thereof. The head portion includes an insert attaching space, an upper and lower respectively located above and below the insert attaching space, a slit extending backward from the insert attaching space, an upper and a lower jaw connecting portions divided by the slit, an upper clamp surface on the upper jaw and a lower clamp surface on the lower jaw opposed to the insert attaching space. A column-shaped groove is connected to the deepest end of the slit. The column-shaped groove is formed to reduce the thickness of the upper jaw connecting portion, and extends from the lateral face on the side of the insert attaching space halfway along the deepest end of the slit toward the opposite lateral face. Upon attaching the insert to the holder the cutting tool is obtained. |
| 主权项 |
1. A holder comprising:
a generally bar-shaped shank portion and a head portion located on a front end side of the shank portion and integrally formed therewith, the head portion including: an upper face, a first lateral face, a second lateral face opposite to the first lateral face, an insert attaching space provided on a front end of the first lateral face, an upper jaw and a lower jaw respectively located above and below the insert attaching space, a slit extending backward from the insert attaching space, an upper jaw connecting portion and a lower jaw connecting portion divided by the slit, an upper clamp surface of the upper jaw opposed to the insert attaching space, a lower clamp surface of the lower jaw opposed to the insert attaching space, and a groove is connected to a rear end of the slit wherein a thickness between the upper face and the groove is less than a thickness between the upper face and the slit, and wherein, in a direction perpendicular to a longitudinal direction from a front end to a rear end of the holder, the length of the groove is less than the length of the slit. |
