Patent ID: 7997163

Claim:
A knob assembly for a scope comprising: a knurl knob, a lock down nut, and a turn knob aligned along a longitudinal axis, the knurl knob having a non-threaded outer surface including knurl knob grooves and an elongated groove receiving a pin, the elongated groove extending from a first end to a second end, the lock down nut disposed adjacent the knurl knob and having a non-threaded outer surface including lock down nut ridges, the turn knob including an inner sidewall defining in part a central cavity formed within the turn knob, the inner sidewall having a non-threaded surface including turn knob ridges having a shape and size for interlocking with both (a) the knurl knob grooves and (b) the lock down nut ridges, the central cavity adapted to receive the knurl knob and to permit movement of the turn knob relative to the knurl knob along the longitudinal axis; the pin extending through a hole in the inner sidewall and into the elongated groove formed in the knurl knob, the pin having a size and shape relative to the elongated groove such that the pin is movable between the first and second ends of the groove; in a first position of the knob assembly, the pin is located proximate the first end of the groove formed in the knurl knob, the knurl knob grooves are received within the central cavity of the turn knob and interlocked with the turn knob ridges, the lock down nut ridges are disposed outside the central cavity of the turn knob and not interlocked with the turn knob ridges, and the knurl knob and the turn knob are rotatable about the longitudinal axis relative to the lock down nut, and in a second position of the knob assembly, the pin is located proximate the second end of the groove formed in the knurl knob, the knurl knob grooves and the lock down nut ridges both are received within the central cavity of the turn knob and interlocked with the turn knob ridges, and the knurl knob and turn knob are not rotatable about the longitudinal axis relative to the lock down nut or relative to each other; wherein the lock down nut ridges are configured for preventing rotational movement of the turn knob about the longitudinal axis relative to the lock down nut when the lock down nut is disposed within the central cavity of the turn knob.