Narrow crossbow with large power stroke

摘要

One or more techniques and/or systems are disclosed for a crossbow may include a main beam; a compound bow assembly mounted to the main beam; and, a trigger mechanism mounted to the main beam for use in holding a bowstring in a cocked position. The crossbow may include wheels at opposite ends of the bow that operatively receive the bowstring. The wheels may be separated by a wheel distance (WD) when the crossbow is in an un-cocked position. The crossbow may also have a power stroke distance (PD) and the ratio WD/PD may be less than 2.0.

主权项

1. A crossbow comprising:
a main beam that has a first end, a second end, a first side, a second side, and an axis of elongation; a bow assembly mounted to the first end of the main beam and comprising:
(a) a bowstring that is movable between a cocked position and an uncocked position; the linear distance between the cocked position and the uncocked position along the axis of elongation of the main beam being the powerstroke distance (PD); PD is at least 10 inches; and the bowstring is adapted to propel an arrow;(b) a riser comprising: a connection portion that connects to the first end of the main beam; a first end that extends from the first side of the main beam and that comprises a first limb receiving surface; and a second end that extends from the second side of the main beam and that comprises a second limb receiving surface;(c) a first bow limb comprising: a first end supported to the first limb receiving surface on the first end of the riser; a second end that extends from the first side of the main beam toward the second end of the main beam; a length from the first end of the first bow limb to the second end of the first bow limb; a concave surface that faces the first side of the main beam when the bowstring is in the uncocked position; a hinge point; and a thickness that varies along the length of the first bow limb from the first end of the first bow limb to the hinge point of the first bow limb;(d) a second bow limb comprising: a first end supported to the second limb receiving surface on the second end of the riser; a second end that extends from a second side of the main beam toward the second end of the main beam; a length from the first end of the second bow limb to the second end of the second bow limb; a concave surface that faces the second side of the main beam when the bowstring is in the uncocked position; a hinge point; and a thickness that varies along the length of the second bow limb from the first end of the second bow limb to the hinge point of the second bow limb; (e) a first wheel that is supported to the first bow limb and that is pivotal with respect to the first bow limb about a first pivot axis that is substantially perpendicular to a ground surface when the arrow is properly propelled, wherein a first line that is substantially parallel to the first pivot axis simultaneously intersects a portion of the first wheel and a portion of the first bow limb; (f) a second wheel that is supported to the second bow limb and that is pivotal with respect to the second bow limb about a second pivot axis that is substantially perpendicular to the ground surface when the arrow is properly propelled, wherein a second line that is substantially parallel to the second pivot axis simultaneously intersects a portion of the second wheel and a portion of the second bow limb; a trigger mechanism mounted to the main beam for use in holding the bowstring in the cocked position; and wherein:
(1) the first and second wheels are adapted to operatively receive the bowstring;(2) the second end of the first bow limb remains positioned longitudinally closer to the second end of the main beam than the first end of the first bow limb: (a) when the bowstring is in the cocked position; and (b) when the bowstring is in the uncocked position;(3) the second end of the second bow limb remains positioned longitudinally closer to the second end of the main beam than the first end of the second bow limb: (a) when the bowstring is in the cocked position; and (b) when the bowstring is in the uncocked position;(4) the first pivot axis and the second pivot axis are separated by a wheel distance (WD) when the crossbow is in the uncocked position;(5) a ratio of WD to PD (WD/PD) is less than 1.8; and(6) the first end of the first bow limb is separated from the first end of the second bow limb at least as wide as a user's foot.