Single cam crossbow having level nocking point travel
AssigneeMathew A. McPherson
InventorsMathew A. McPherson, Gary L. Simonds
Life of this patent
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Abstract
A crossbow with level nocking point travel comprises an inventive cam assembly having a first groove defining a primary string payout track, a second groove defining a secondary string payout track and a third groove defining a take-up track. The ratio of the length of the take-up track to the length of the primary string payout track is less than about 0.4.
Claims18
A crossbow comprising:
- a mounting portion;
- a first limb supported by the mounting portion;
- a second limb supported by the mounting portion;
- a pulley rotatably mounted upon the first limb for rotation about a first axle, the pulley including a pulley track;
- a cam assembly rotatably mounted upon the second limb for rotation about a second axle, the cam assembly having
- a primary string payout track,
- a secondary string payout track, and
- a take-up track;
- and
- wherein the ratio of the length of the take-up track to the length of the primary string payout track is less than about 0.4.
In a crossbow having an upper limb and a lower limb, the upper limb having a rotatably mounted pulley with a track and the lower limb having a dual feed-out cam with a primary string payout track and a take-up track, the improvement comprising the ratio of the length of the take-up track to the length of the primary string payout track being less than about 0.4.
Dependencies are inferred from the claim text.