| 摘要 |
A rapid clamping base for an open rifle sights, the base consisting of two clamping frames, a front frame (1) and a rear frame (2), whose clamping rings (3,4) retain the sight (5). The frames can be clamped by means of a rapid retainer to a two-piece clamping rail (6, 7) in a gun, such as a sporting gun. The claws (8, 9) provided in the front frame (1) for engagement with the clamping rail (6) are provided at differ- ent locations relative to the longitudinal direction of the rail so as to be pressed in engagement with the edges of the rail when the optic sight (5) is turned in the hori- zontal plane from the lateral direction (10) to the central line of the gun. The front frame (1) also comprises a support tongue (11) extending downwardly and bearing against the rear edge of the front clamping rail (6). The rear frame (2) comprises second claws (12, 13) engaging the clamping rail (7), one claw (12) being solidly mounted in the rear frame and the other, i.e. the clamping claw (13) being movable and in position to be pressed against the edge of the rail. The rear frame (2) also comprises a support tongue (14) extending downwards and bearing against the front edge of the rear clamping rail (7), both of the frames thus having three pressing points on the clamping rails.
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