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US 4,072,396 AGranted
Focussing objective mechanism for telescopic rifle sights
AssigneeW. R. Weaver
InventorCecil J. Ross
Life of this patent
Estimating the term…
Abstract
A mechanism for focussing the objective lens assembly of a variable power telescopic rifle sight. A rotatable cam ring is used in conjunction with a coil spring which urges the lens assembly against the cam ring. A lens retainer portion of the lens assembly adjacent to the cam ring has formed thereon a camming ramp which is complimentary to a camming surface formed on the cam ring.
Claims5
A focussing objective mechanism for a telescopic gun sight comprising in combination:
- a. a sight barrel;
- b. an objective lens assembly mounted in said barrel for axial reciprocal movement therein, said lens assembly having one end wall thereof formed with a predetermined helical pitch extending for substantially the entire duration of said one end wall;
- c. a ring rotatably mounted on said barrel but fixed against axial movement thereon, said ring being adjacent to said lens assembly and having an end surface facing said lens assembly end wall, substantially the entire duration of said end surface which faces said lens assembly end wall being formed with the same predetermined helical pitch as said lens assembly end wall;
- and
- d. spring means engaging said lens assembly to bias said end wall into engagement with said ring end surface.
2 more elements
A focussing objective mechanism for a telescopic gun sight comprising in combination:
- a. a sight barrel;
- b. an objective lens assembly mounted in said barrel for axial reciprocal movement therein, said lens assembly having one end wall thereof formed with a predetermined helical pitch over substantially its entire extent, said end wall including a slot having a bottom wall formed with said predetermined helical pitch, and said slot having side walls;
- c. a ring rotatably mounted on said barrel but fixed against axial movement thereon, said ring being adjacent to said lens assembly and having an end surface formed with said predetermined helical pitch throughout substantially its entire extent, said end surface facing said lens assembly end wall, and said end surface including a projecting lug disposed within the confines of said slot and having an end wall formed with said predetermined helical pitch and side walls, the respective slot and lug side walls forming stops defining the rotational arc through which said ring can be turned;
- and
- d. spring means biasing said lens assembly toward said ring to urge said lens assembly end wall into face-to-face contact with said ring end surface.
2 more elements
A focussing objective mechanism for a telescopic gun sight comprising in combination:
- a. means forming a sight barrel;
- b. an objective lens assembly mounted in said sight barrel for reciprocal axial sliding movement therein, said lens assembly including one end wall formed with a predetermined helical pitch;
- c. means fixing said lens assembly against rotational movement in said sight barrel;
- d. a focussing collar mounted on said sight barrel for rotational movement thereon, said collar having one end thereof which is threaded;
- e. means for preventing said collar from moving axially of said sight barrel;
- f. a shroud screwed onto said collar;
- g. a camming ring carried by said shroud, said camming ring having an end surface facing said lens assembly end wall, said end surface being formed with the same predetermined helical pitch;
- h. spring means engaging said lens assembly to bias said end wall thereof into face-to-face contact with said end surface of said camming ring;
- i. means securing said camming ring to said shroud;
- and
- j. means securing said shroud to said collar to prevent said shroud from being unscrewed from said collar and to enable said collar, said shroud and said camming ring to be concurrently rotated to focus said lens assembly at a plurality of different distances from the sight.
8 more elements
Dependencies are inferred from the claim text.