| 摘要 |
In a tensioning gripper (1) with ring (2) and coaxially arranged rotary pin (3), both being provided with a slot (5, 4) suitable for receiving the matrix (6) to be tensioned, the slot (4) of the rotary pin (3) has a symmetry plane ( gamma ) parallel to the longitudinal axis (h) of the rotary pin (3). The sides of the slot are composed by two angled portions (4', 4''), said sides being arranged mirror-like on both sides of said symmetry plane ( gamma ) and both portions (4', 4'') are converging towards said longitudinal axis (h) of said rotary pin (3), the two vertices (B, C) of the portions (4', 4'') being opposite and adjacent one to the other. Such a slot allows an easy introduction and gripping of the matrix until, by rotating the pin, the matrix is held and tensioned. <IMAGE> |
