Dual-feed single-cam compound bow

Abstract

A cam is eccentrically journaled at one end of a compound archery bow and a pulley is journaled at the other end of the bow. A cable passes around the pulley to form a bowstring section and a second cable section, both sections forming a dual feed single cam compound bow. The amount of feed out to both ends of the bowstring is approximately the same. One embodiment of the cam provides a large radius cam groove and a smaller radius cam groove which are designed to synchronize the rate of cable feed out at both ends of the bowstring section during the drawing operation. An anchor cable is provided to tie the two limbs of the bow together during the flexing of the bow.

Description

[0001]This application claims the benefit of and is a continuation of application Ser. No. 10 / 934,630, filed Sep. 3, 2004, which is a reissue of application Ser. No. 09 / 160,983, filed Sep. 25, 1998, now U.S. Pat. No. 6,443,139, which is a continuation of application Ser. No. 08 / 047,481, filed Apr. 19, 1993, now U.S. Pat. No. 5,890,480, which is a continuation-in-part of application Ser. No. 07 / 875,748, filed Apr. 28, 1992, now U.S. Pat. No. 5,368,006.BACKGROUND OF THE INVENTION[0002]In the past, most compound archery bows have used two cams, respectively mounted on the limb tips at opposite ends of the bow to provide the means to store more energy in the draw cycle and to reduce the force necessary to hold the bowstring in the full draw position. Examples of such compound bows are disclosed in the following U.S. patents.[0003]U.S. patent No. Issued To Date Issued U.S. Pat. No. 3,486,495 Allen Jun. 23, 1966 U.S. Pat. No. 3,890,951 Jennings, et al. Jun. 24, 1975 U.S. Pat. No. 4,060,06...

AI Technical Summary

Benefits of technology

The design provides a smooth, consistent arrow nocking point path and improved performance by synchronizing the feed-out of cables at both ends of the bowstring, enhancing ease of use and arrow matching.

Problems solved by technology

There was, however, a problem in synchronizing the rate that the cam fed out cables to the bowstring at the lower end of the bow and the rate that the flexing of the upper limb feed out cable to the bowstring at the upper end as the bow was drawn.

The result was a rather unpleasant feel to the bow as it was drawn and there was a drastic movement of the nocking point and the rear end of the arrow as the bow was drawn and released.

This, in turn, made it very difficult to achieve good arrow flight from the bow under normal conditions.

The Dynabo bow, however, never did become an acceptable alternative to the two cam bows and, in fact, appears to have lost whatever popularity it had achieved by the late 1970's.

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