| 摘要 |
The present invention relates to a telescopic sight (1) for a firearm, having an external housing (2) and at least one manually adjustable sighting mechanism (12, 13) including a manual adjustment control (14, 20, 22) mounted on the housing. The telescopic sight comprises an elongate housing (2) that houses an optical system (6, 8, 10) that presents an image and an aiming point in the image to a user the sight, and at least one sighting adjustment mechanism including a manual adjustment control (14) accessible to the user on the housing for manually effecting a sighting adjustment of the aiming point relative to the image. The optical system comprises an objective lens (6), an eyepiece lens (8) and within housing interior between these lenses an adjustable sighting assembly (10) including a sighting element (50) bearing a graphic image pattern (52) that is optically arranged with respect to the objective and eyepiece lenses such that the graphic image pattern provides the aiming point in the image. The adjustable sighting assembly comprises at least one movable member (42) for adjusting the optical arrangement of the assembly with respect to the objective and eyepiece lenses whereby movement of the movable member causes the sighting adjustment. The housing has a port (35) therethrough and the sighting adjustment mechanism comprises a movable plunger (30) that is slidably engaged in the port to link the manual adjustment control with the movable member whereby, in use, manual adjustment of the control causes the plunger to slide in the port and move the movable member to make the sighting adjustment. The slideable engagement is such the housing interior (40) remains atmospherically sealed as the plunger slides in the port. The manual adjustment control (14, 20, 22) is removably affixed (28, 29, 31) to the housing, and the plunger is separable from the manual adjustment control to remain slidably engaged in the port when the manual adjustment control is removed from the housing in order to maintain the atmospheric seal of the housing interior. |
