Patent ID: 8827898

Claim:
An assembly for endoscope, comprising: a tubular member at its external wall thereof having a first threaded portion, a second threaded portion, and a threadless middle portion located between the first and second threaded portions; a positioning ring having a threaded part formed at an internal wall thereof and threaded with the second threaded portion of the tubular member, the positioning ring being axially movable along the tubular member by means of the aforesaid threaded connection; and a sleeve having an opening and a threaded section formed at an internal wall thereof, the threaded section being shorter than the middle portion, the sleeve being threadedly sleeved onto the tubular member through the opening, the threaded section being located at the middle portion of the tubular member, the threaded section being stopped against an opposite end of the first threaded portion with respect to the middle portion, the positioning ring having a distal end pushed distally against the sleeve to position the sleeve onto the tubular member.