Operator-selectable-stop turret knob

1. A turret knob, comprising

an adjustable member capable of being adjustably positionable about an axis of rotation;

an engagement member coupled to the adjustment member, a relative position of the engagement member with respect to the axis of rotation corresponding to a position of the adjustable member as the adjustable member is adjustably positioned about the axis of rotation; and

a plurality of stop members positioned about the axis of rotation, each stop member capable of interfering with the engagement member and blocking movement of the adjustable member as the adjustable member is adjustably positioned about the axis of rotation, and

the adjustable member being adjustably positionable about the axis of rotation between adjacent stop member positions.

2. The turret knob according to claim 1 , wherein the engagement member is releasable from a stop member when the stop member interferes with the engagement member and blocks the adjustable member so that the adjustable member is adjustably positionable past the stop member.

3. The turret knob according to claim 2 , wherein at least one stop member is selectably positionable by a user.

4. The turret knob according to claim 3 , further comprising a release member coupled to the engagement member, the release member capable of being actuated to release the engagement member from a stop member when the stop member interferes with the engagement member and blocks the adjustable member so that the adjustable member is adjustably positionable past the stop member.

5. The turret knob according to claim 4 , wherein the engagement member comprises a stop pin coupled to the release member, and

wherein the plurality of stop members comprise a ball bearing, or a stop pin, or combinations thereof.

6. The turret knob according to claim 5 , wherein the release member is pressed to be actuated.

7. The turret knob according to claim 4 , wherein the release member is lifted to be actuated.

8. The turret knob according to claim 3 , wherein the engagement member is releasable from a stop member by increasing a force applied to the adjustable member to adjustably position the adjustable member about the axis of rotation.

9. The turret knob according to claim 8 , wherein the engagement member comprises a protuberance on a stop ring, and

wherein the stop ring is a spring-loaded stop plunger.

10. The turret knob according to claim 3 , wherein the adjustable member is coupled to an adjuster of an optical enhancement device, the adjuster having an adjustment setting, and a change in the selected position of the adjustment member produces a change in the adjustment setting of the adjuster of the optical enhancement device.

11. The turret knob according to claim 10 , wherein the optical enhancement device comprises a telescopic sight, a telescope or microscope.

12. The turret knob according to claim 1 , wherein the adjustable member is coupled to an adjuster of an optical enhancement device, the adjuster having an adjustment setting, and a change in the selected position of the adjustment member produces a change in the adjustment setting of the adjuster of the optical enhancement device.

13. The turret knob according to claim 12 , wherein the optical enhancement device comprises a telescopic sight, a telescope or a microscope.