| 摘要 |
The invention relates to a device for securing an expandable hub in a hole, particularly, but not exclusively, the hub of a cable drum wheel in the center hole in the side of a cable drum, the hub having projecting in an axial direction a part which is intended to be inserted into said hole and expanded there to bear against the walls of the hole. The projecting part consists of a number of radially movable tightening jaws, which are capable of being actuated by a bracing block. This bracing block has a number of slots corresponding to the number of jaws, said slots having an inclined guide surface and this guide surface acts upon a corresponding guide surface on one end of the interacting jaw in conjunction with the radial displacement of the jaw when the block is operated, both the jaws and the block remaining unrotatable when operated. According to the invention a second inclined guide surface at the opposite end of each jaw is arranged to interact with a complementary guide surface at the radially inner end of a radial oblong slot in a guide plate attached to the hub, said jaw in radial and axial movement being unrotatably guided in said oblong slot, and the bracing block is operated by means of a shaft running through the hub, in addition to which said plate permits an improved centering of the device when said device is inserted into the hole. |
