Spiral cam mechanism for rifle sight adjustment
First Claim
1. An adjustment mechanism for a telescopic rifle sight of the type including an elongate tubular housing having a longitudinal axis and a movable optical element mounted within the housing, comprising:
- a cam hub mounted to the housing for rotation about an axis of rotation, the cam hub positioned so that the axis of rotation is substantially perpendicular to the longitudinal axis, the cam hub including a drive face and a spiral cam track formed in the drive face around the axis of rotation; and
an actuator slidably mounted for movement along the longitudinal axis of the housing and including a cam follower operably engaged in the spiral cam track so that the actuator moves generally along the longitudinal axis in response to rotation of the cam hub, the actuator operatively connected to the optical element to drive the optical element in response to rotation of the cam hub.
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Accused Products
Abstract
A focus adjustment mechanism for a telescopic rifle sight includes a rotatable cam hub including a drive face and a spiral cam track formed in the drive face around an axis of rotation. An actuator slide of the adjustment mechanism is slidably mounted to a housing of the telescopic rifle sight for movement along a longitudinal axis of the housing. The actuator slide includes a cam follower that is operably engaged in the spiral cam track so that the actuator slide moves generally along the longitudinal axis in response to rotation of the cam hub to changing a setting of the adjustment mechanism. The actuator slide is operatively connected to a movable optical element positioned within the housing of the telescopic rifle sight to drive the optical element in response to rotation of the cam hub. The rate of linear movement of the optical element relative to the rate of rotation of the cam hub is controlled by the shape and arcuate angle of the spiral cam track. A spring biases the actuator slide relative to the housing to prevent rifle recoil from inducing changes to the setting of the adjustment mechanism.
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Citations
20 Claims
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1. An adjustment mechanism for a telescopic rifle sight of the type including an elongate tubular housing having a longitudinal axis and a movable optical element mounted within the housing, comprising:
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a cam hub mounted to the housing for rotation about an axis of rotation, the cam hub positioned so that the axis of rotation is substantially perpendicular to the longitudinal axis, the cam hub including a drive face and a spiral cam track formed in the drive face around the axis of rotation; and
an actuator slidably mounted for movement along the longitudinal axis of the housing and including a cam follower operably engaged in the spiral cam track so that the actuator moves generally along the longitudinal axis in response to rotation of the cam hub, the actuator operatively connected to the optical element to drive the optical element in response to rotation of the cam hub. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A telescopic rifle sight having an adjustable focus setting and an adjustable aiming offset, the telescopic rifle sight including a tubular housing having a longitudinal axis, an interior and exterior, and first and second ends, and an elongate erector assembly pivotally mounted within the interior of the housing generally along the longitudinal axis and medially of the first and second ends, the erector assembly including a distal end, the telescopic rifle sight comprising:
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(a) an adjustable aiming control device in operative association with the erector assembly for pivotally moving the erector assembly so that the distal end moves within the housing transversely of the longitudinal axis to thereby adjust the aiming offset of the telescopic rifle sight;
(b) a movable optical element slidably mounted within the housing for movement generally along the longitudinal axis; and
(c) a manually adjustable focus control device projecting outwardly from the exterior of the housing in a direction transverse to the longitudinal axis, the focus control device including;
(i) a cam hub mounted for rotation about an axis of rotation, the cam hub positioned so that the axis of rotation is substantially perpendicular to the longitudinal axis, the cam hub including a drive face facing toward the interior of the housing and a spiral cam track formed in the drive face around the axis of rotation, the spiral cam track spiraling outwardly from the axis of rotation, and (ii) an actuator slide slidably mounted to the housing for movement along the longitudinal axis and including a cam follower operably engaged in the spiral cam track so that the actuator slide moves generally along the longitudinal axis in response to rotation of the cam hub, the actuator slide operatively connected to the movable optical element to drive the movable optical element in response to rotation of the cam hub and thereby adjust the focus setting of the telescopic rifle sight. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification