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The binary cam is a design for the pulley system of a compound bow. Craig Yehle, director of research and development at Bowtech Archery, received a patent [1] for the design on December 11, 2007. Bowtech started equipping its bows with the new cam design in the 2005 model year. [2] [3]
Archer Erika Jones shooting a compound bow at the 2013 Archery World Cup. The bow has the axle attaching the limb to cam mounted at the edge of the cam as opposed to the center. In modern archery, a compound bow is a bow that uses a levering system, usually of cables and pulleys, to bend the limbs. [1]
This limb stiffness makes the compound bow more energy-efficient than other bows, in conjunction with the pulley/cams. The typical compound bow has its string applied to pulleys (cams), and one or both of the pulleys have one or more cables attached to the opposite limb. When the string is drawn back, the string causes the pulleys to turn.
The compound bow was invented by Holless Wilbur Allen in the 1960s (a US patent was filed in 1966 and granted in 1969) and it has become the most widely used type of bow for all forms of archery in North America. Mechanically drawn bows typically have a stock or other mounting, such as the crossbow. Crossbows typically have shorter draw lengths ...
Allen was born July 12, 1909, in Stilwell, Kansas.In the 1960s, he sawed the ends off a conventional recurve bow and then added pulleys to each end. [1] Allen experimented with a number of designs to apply for a patent on June 23, 1966, [2] and U.S. patent 3,486,495 was granted to him in December 1969.
Drawing a bow, from a 1908 archery manual. A bow consists of a semi-rigid but elastic arc with a high-tensile bowstring joining the ends of the two limbs of the bow.An arrow is a projectile with a pointed tip and a long shaft with stabilizer fins towards the back, with a narrow notch at the very end to contact the bowstring.
Self bows, composite bows, and laminated bows using the recurve form are still made and used by bowyers, amateurs, and professional archers. The unqualified phrase "recurve bow" or just "a recurve" in modern archery circles usually refers to a typical modern recurve bow, as used by archers in the Olympics and many other competitive events.
The same takedown bow is shown disassembled on a travel case, and assembled for use. A takedown bow is a bow assembled out of a riser and two limbs to make a working bow when strung.
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