| 摘要 |
The invention relates to an expansion head (1) for expansion tools for hollow workpieces, in particular for the ends of pipes made of plastics and made of metals covered with plastics, comprising a union cap (2), which has a guide flange (3) directed radially inward, and a set of sector-shaped expandable jaws (4), which are each guided individually on the guide flange (3) in a radially movable manner by an inner flange sector (5), which overlaps with the guide flange (3), and by a radial groove (6), wherein an annular returning means (7) for returning the expandable jaws (4) is arranged on the inner flange sectors (5) in complementary groove sectors (14) on the inner flange sectors (5), each of the inner flange sectors (5) is rigidly connected to an end of a guide pin (8), radial guide grooves (9) for the accommodation and the motion of the guide pins (8) are arranged in the guide flange (3), and the other ends of the guide pins (8) do not protrude beyond the side of the union cap (2) facing the expansion area of the expandable jaws (4). The invention further relates to an expansion tool for hollow workpieces, in particular for the ends of pipes made of plastics and made of metals covered with plastics, comprising such an expansion head (1). |
