A locking adjustment device for changing an adjustable setting of a device such as a riflescope locks in a baseline position to provide expedient feedback regarding an adjustment position of the adjustable setting. The device includes a guideway extending around an axis and a knob mountable over the
A locking adjustment device for changing an adjustable setting of a device such as a riflescope locks in a baseline position to provide expedient feedback regarding an adjustment position of the adjustable setting. The device includes a guideway extending around an axis and a knob mountable over the guideway for rotation about the axis. The guideway includes a notch and a curved slide surface sized to slidably receive a guide tab carried by the knob. The guide tab is biased so as to urge at least a portion of the guide tab into the notch when the knob is rotated to a locked position, thereby preventing inadvertent rotation of the knob from the locked position. A button carried by the knob is depressible to urge the guide tab out of the notch and thereby allow the knob to be manually rotated away from the locked position.
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1. A locking adjustment device for adjusting a setting of a riflescope or other aiming device, comprising: a guideway including a slide surface extending around a rotational axis, and a notch formed in the slide surface;a knob mountable over the guideway for rotation about the rotational axis when t
1. A locking adjustment device for adjusting a setting of a riflescope or other aiming device, comprising: a guideway including a slide surface extending around a rotational axis, and a notch formed in the slide surface;a knob mountable over the guideway for rotation about the rotational axis when the adjustment device is installed on the aiming device;a guide tab carried by the knob for rotation therewith and slidably received in the guideway when the adjustment device is installed on the aiming device, the guide tab being movable relative to the knob and biased against the slide surface so as to urge at least a portion of the guide tab toward the notch when the knob is rotated to a locked position at which the guide tab is aligned with the notch, thereby preventing inadvertent rotation of the knob relative to the aiming device from the locked position; anda button carried by the knob for rotation therewith, the button operably associated with the guide tab and movable therewith relative to the knob when the button is manually depressed to urge the guide tab out of the notch and thereby allow the knob to be manually rotated about the rotational axis away from the locked position. 2. The locking adjustment device of claim 1, wherein the guideway includes a second slide surface extending around the axis and linked to the slide surface via a transition section wherein the guide tab is movable along the second slide surface and the transition section when the knob is rotated. 3. The locking adjustment device of claim 2, wherein the second slide surface includes a stop that blocks the guide tab to limit rotation of the knob beyond the stop. 4. The locking adjustment device of claim 3, wherein the guideway is spiraled and the slide surface is at a first radial position from the rotational axis and the second slide surface is at a second radial position from the rotational axis. 5. The locking adjustment device of claim 1, further comprising an indicator unit carried by the knob and movable relative to the knob, the indicator unit visible on a surface of the knob, wherein the indicator unit is at a first position when the guide tab is aligned with the notch and at a second position when the guide tab is positioned along the slide surface away from the notch. 6. The locking adjustment device of claim 5, wherein the indicator unit is coupled to the guide tab and the locking adjustment device further comprises a biasing element operatively associated with the guide tab and the indicator unit to urge movement of the indicator unit from the second position to the first position. 7. The locking adjustment device of claim 5, wherein the indicator unit is slidably received in a slot arranged on the surface of the knob. 8. The locking adjustment device of claim 3, further comprising: an indicator unit coupled to the guide tab and visible on a surface of the knob; anda biasing element operatively associated with the guide tab and the indicator unit, wherein the indicator unit is at a first position when the guide tab is aligned with the notch, a second position when the guide tab is positioned along the slide surface away from the notch, and a third position when the guide tab is positioned along the second slide surface, and wherein the biasing element urges movement of the indicator unit from the third position to the second position and from the second position to the first position. 9. The locking adjustment device of claim 1, wherein the aiming device includes a housing and the locking adjustment device further comprises: a spindle mounted to the housing for rotation about the axis; anda threaded plunger extending within the housing of the aiming device and threadably coupled to the spindle, wherein rotation of the spindle about the axis causes movement of the threaded plunger along the axis. 10. The locking adjustment device of claim 9, wherein the guideway is formed along a substantially circular guide ring. 11. The locking adjustment device of claim 10, further comprising a retaining ring surrounding the spindle for securing the spindle to the housing, wherein the guide ring is press fit to the retaining ring. 12. The locking adjustment device of claim 1, wherein the notch extends in a radial direction relative to the rotational axis, and wherein the guide tab is biased in the radial direction. 13. The locking adjustment device of claim 12, wherein the guide tab extends inwardly within the knob toward the aiming device. 14. The locking adjustment device of claim 1, wherein the guideway comprises a channel. 15. The locking adjustment device of claim 1, wherein a radial distance from the guide tab to the rotational axis changes when the button is depressed. 16. The locking adjustment device of claim 1, wherein the guide tab automatically transitions from the slide surface into the notch when the knob is rotated to the locked position. 17. The locking adjustment device of claim 1, wherein the knob further includes a scale comprising indicia spaced apart on a circumference of the knob to facilitate fine adjustments. 18. The locking adjustment device of claim 1, wherein the locked position corresponds to a baseline position of the adjustable setting.
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