| 摘要 |
A releasable drive coupling comprising a first drive element 132 having a first projecting flexible arm 133, and a second drive element 134 capable of sliding relative to the first drive element 132 and having a drive surface adapted to receive the first flexible arm 133, to allow axial loads to be transmitted from one drive element to the other, and a second projecting flexible arm 135 so positioned relative to the drive surface that inward flexing of the second flexible arm 135 causes it to act upon the first flexible arm 133 and flex the latter to a point at which it is no longer received by the drive surface, at which point the first and second drive elements 132 134 are free to slide relative to one another and the drive coupling is thus disengaged. |
