| 摘要 |
The grip part (2) of the tool has at least one trough-shaped aperture (2b). The axial length (L) of the aperture corresponds to the length (1) of the dowel. Its wall is curved at a radius, which corresponds to half the external diameter of the dowel. The largest depth of the aperture is at most half the outer dowel diameter, e.g. 0.2 to 0.4 of the diameter. The axial extension of the aperture is parallel to the longitudinal axis of the grip part. |
