Seal with a blockable rotor for measuring instruments

The seal with a blockable rotor for measuring instruments comprises a transparent body 1 made from a high-strength plastic and formed with a cylindrical cavity 2 having a blind end and openings 3, which are formed on lateral sides of the cavity 2, and through which a flexible sealing element passes, and a rectangular cavity 4, which is installed at the open end of the cavity 2, transversely with respect to the latter, wherein the cavities 2 and 4 are interconnected. Cavity 4 contains a device 5 to block the rotation of the rotor 6 while the cylindrical cavity 2 houses the rotor 6 with the openings 7, coaxial with openings 3 located on the lateral sides of the cylindrical cavity 2. The rotor 6 is arranged inside the cylindrical cavity 2 so as to be rotatable in one direction with the help of flexible ratchet locks 8 made on it, contacting with the longitudinal ribs made on the inner side of the cavity 2, in the lateral walls of which and in the rotor (6) coaxial openings (3) and (7) for the flexible sealing element are made;

• the rotor (6) is divided by a partition (10) into two cavities for winding a flexible sealing element on it. On one end of the rotor (6) a blocking cross-shaped element (9) is mounted while on the front outer wall of the rotor (6) a handle (11) is installed. The rectangular cavity (4) houses a blocking device (5) for the rotor (6) rotation, one end of which two fork-shaped projections (13) are available between which a trapezoidal groove (15) is made to fix the blocking cross-shaped element (9). At the same time, the flexible ratchet locks (16) are made on the lateral walls of the blocking device (5) and rigid ribs (17) are made on the inner front walls of the element in the form of a rectangular parallelepiped (4).