| 摘要 |
A coupling for rotatably connecting a reel with a drive shaft has a support which is fast with the drive shaft. The support is provided with a recess which is designed to receive a complementary stub shaft fixed to the reel. The recess has an open side via which the stub shaft may be inserted in and removed from the recess, and an arresting element in the form of a wheel is provided to close the open side. The arresting wheel is pivotally mounted on the support for movement between a release position in which the open side of the recess is exposed to permit insertion of the stub shaft in, and removal of the latter from, the recess, and an arrest position in which the open side of the recess is closed to prevent release of the stub shaft. The pivot axis of the arresting wheel extends at right angles to the axis of rotation of the support. A pawl is pivotally mounted on the arresting wheel for movement between an operative and an inoperative position, and the pivot axis of the pawl is parallel to that of the arresting wheel. The pawl has a free end portion, and the support is provided with a cutout which receives this end portion when the arresting wheel is in its arrest position and the pawl is in its operative position. The pawl an the cutout are designed in such a manner that, in the operative position of the pawl, the latter prevents unintentional movement of the arresting wheel from its arrest position to its release position. The pawl has an arm which may be gripped in order to pivot the pawl to the inoperative position in which the pawl is clear of the cutout. The arresting wheel may then be moved to its release position. |
