A compound archery bow includes a bow handle having projecting limbs, and first and second pulleys mounted on the limbs for rotation around respective axes. A bow cable arrangement includes a bowstring cable extending from a bowstring anchor through a bowstring let-out groove on the first pulley and then toward the second pulley. A first power cable extends from a first power cable anchor through a power cable let-out arrangement on the first pulley toward the second pulley, and a second power cable extends from the second pulley through a power cable take-up arrangement on the first pulley to a second power cable anchor on the first pulley. Draw of the bowstring cable away from the handle lets out bowstring cable from the bowstring let-out groove and rotates the first pulley around the first axis, lets out the first power cable from the power cable let-out arrangement on the first pulley and takes up the second power cable into the second power cable take-up arrangement on the first pulley. A power cable stop is disposed on the first pulley at a position to be engaged by the first power cable as the first pulley is so rotated to inhibit further rotation of the first pulley and thereby inhibit further draw of the bowstring cable.

Compound archery bow

Device for launching a projectile or a launch object in general, comprising: a stock having a longitudinal development direction between a rear or proximal end and a front or distal end; at least two bending members associated to said stock on opposite sides of it and having a preferential development direction, said bending members being apt to be subjected to bending in order to accumulate and supply energy usable to launch said projectile, and released in a rest condition; tensioning means of said bending members; pushing means of said projectile apt to cooperate with said bending members. Said tensioning means comprise at least two cams arranged on opposite sides of the stock, each of which is pivoted at a respective first axis of rotation and is associated to at least one corresponding bending member, so that an angular displacement of said cam around said first axis of rotation determines a bending action on said at least one corresponding bending member. Said pushing means comprise at least two arms arranged on opposite sides of the stock and connected to each other through a flexible member, wherein each of said arms has a first end pivoted at a second axis of rotation and a second end apt to support a portion of said flexible member. Each of said arms is operatively connected to a respective cam, so that a rotation of each arm in a first rotation direction determines a bending of said bending members by means of the cam during a loading phase of the device and that, during a launch phase of said projectile, a return of the bending members towards said rest condition determines, by means of the cam, a rotation in the opposite direction of each arm.

Device for launching a projectile or a launch object in general

A single-cam compound bow ( 200 ) has two stretches ( 213, 214 ) of bowstring ( 212 ) and two stretches ( 227, 228 ) of cable ( 226 ) extending between free outer ends ( 207, 211 ) of the limbs ( 204, 208 ). A cam ( 217 ) is attached to a free outer end of one limb. One or more pulleys ( 320, 330 ) are attached to a free outer end of another limb. In one embodiment, the one or more pulleys attached to the free outer end of the other limb include one or more mechanical pulleys ( 1002, 1202, 1203 ). One end of cable is attached to sides ( 435, 436 ) of a fork ( 215 ) at the free outer end of the limb having the cam.

Single-cam split-harness compound bow

Certain embodiments of the present disclosure describe a crossbow that includes a stock assembly. Flexible limbs extend laterally from the stock assembly. Cams are rigidly attached directly to the stock assembly or to extensions from the stock assembly, typically within an area defined by the limbs.

Crossbow cam system

A compound bow or crossbow employs bowstring cams with bowstring cam grooves and power cord cam grooves. Preferably a pair of generally identical power cord cam grooves are positioned axially above and below the bowstring cam groove. The power cords are anchored to a fixed anchor point, e.g., a pylon, on the near end of the riser or on the near side of the crossbow bar or stock. The power cords do not cross over to the other limb. The reduction in the number of cam wheels and pulleys and in the number of strings or cords results in greater efficiency and higher transfer of energy from the bow to the arrow or bolt. There is no drop-off in pull weight at full draw. The bolt or arrow accelerates throughout the travel of the bowstring, resulting in significantly higher velocity.

Bowstring cam arrangement for compound long bow or crossbow

An archers bow comprising a center riser section, two primary resilient limbs, a pair of twin grooved, dual-planar compound pulleys, with the compound pulleys being employed in a multiple of possible ways with non-coplanar actuator elements for purposes of inducing mechanical advantage, with the mechanical advantage induced by the pulleys being used by the archer to aid in bending the limbs on the bow in a manner which eliminates pulley/actuator induced torsion from the system. The invention defines an actuator configuration for the pulleys consisting of one or more sections, including tensioning actuator sections and one actuator section that is suitable for use as a bowstring, and includes a method for connecting the tensioning actuators to the pulleys, and to terminating locations on a pair of resilient Pulley Return Energy Storage e.g. PRES components provided separately for that purpose, which, in an overall bow configuration, provides that aside from the bowstring section used by the archer to actuate the pulleys, no part of the actuator or actuators connected to the pulleys is ever positioned in a manner whereby the actuator or actuators would intersect the horizontal plane bisecting the riser assembly of the bow at any time. The invention further seeks to define, and provide methods for solving, a plurality of known, as well as some perhaps previously unknown, problems affecting compound bows which have not been successfully addressed previously. The inventive bow defines and incorporates combinations of interchangeable components which can be configured to produce a variety of energy storing patterns for archers of all draw lengths, while allowing use of decreased fistmele distances, which serves to lengthen acceleration stroke distances.

Synchronous compound bow with non-coplanar actuators and interchangeable leveraging components

The invention defines alternate means of increasing mechanical advantage in asynchronous compound bows of a type generally defined in US Pat No 6,470,870, which employ dual planar compound pulleys as the primary leverage inducing agent, and at least one non-coplanar actuator section rigging Additional pulley elements are added to the primary limb, or PRES member extension, or both, in a variety of possible configurations, in a manner that provides greater leverage than would be present in prior art asynchronous compound bows of the type defined generally by US Pat No 6,470,870

Means of increasing mechanical advantage in asynchronous compound bows

An improved arrow shaft comprised of a core of substantially round, very lightweight, porous material, with the porous core having sections that have different diameters at various points along the length of the arrow shaft, with the lightweight core materials being overwrapped with different thickness' of reinforcing materials such that the resulting outside diameter of the finished arrow shaft has substantially parallel surfaces over the entire length of the shaft and the finished shaft has a substantially constant circumference and outside diameter along its entire length. The inventive composite arrow shaft incorporates different thickness' and weights of reinforcement materials, strategically placed along it's length, in a manner that results in providing, in an integral manner, proper front to back balance in the finished arrow, with the proper balance achieved by using the same weight point, point insert, nock, nock insert, and fletching materials, regardless of the length the shaft is cut off at. The preferred embodiment of the inventive arrow shaft includes end sections at each end that have greater thicknesses of reinforcement materials overlaying the core, than at other intermediate sections of the shaft, with the increased reinforcement materials at each end of the shaft serving to increase, in an integral manner, the strength of the shaft in these areas. The preferred embodiment of the inventive arrow shaft also includes at least one other section intermediate the end sections of the shaft that also has greater thicknesses of reinforcement materials along it's length than do some other sections of the shaft that are intermediate the additionally-reinforced end sections.

John G. Schaar

Papers

Synchronous compound bow with non-coplanar actuators and interchangeable leveraging components

Means of increasing mechanical advantage in asynchronous compound bows

Weight-forward composite arrow shaft