| 摘要 |
A tool assembly (1) comprising first (3) and second (2) tool assembly components adapted to be coaxially coupled together so as to have a common longitudinal axis and so that a motion drive transmitted to the first component (3) is transmitted to the second (2) component; the components being formed with interfitting male (9) and female (12) coupling members, each coupling member being formed with at least two terminal lobe (10, 13) portions and a central (11, 14), symmetrically disposed portion which is inset with respect to its associated lobe portions, the central portion (11) of the male coupling member mating within the central portion (14) of the female coupling member whilst each lobe portion (10) of the male coupling member mates within a lobe portion (13) of the female coupling member so as to form a mating pair of lobe portions; the coupling members being formed, adjacent each mating pair of lobe portions and remote from the axis with respective pairs of surfaces of which at least one is curved so that, upon relative rotational displacement of the components about the common axis a point of contact is established between at least one pair of surfaces, such that an angle mu defined between a tangent to the curved surface at the point of contact and a radius extending from the common axis to the point of contact lies substantially between -10 DEG and +25 DEG . |
