| 摘要 |
The device has a socket (11) made of insulating material, and a support ring (20) that carries the socket. A front unit is prefixed to the socket, where the support ring is adjusted along the socket and is fixed in two positions. A distance ring is provided for extending the front unit in a backward manner. The socket has a flange-like front edge (14) that forms an end stop for the support ring. The front edge forms fixing units for centering the distance ring relative to the support ring. The socket has a side wall (12) and a base (13), and locking units for fixing the support ring. |
