| 主权项 |
1. A crossbow, comprising:
a main beam that: extends longitudinally; has first and second sides with a width W1 between the first and second sides; and, has an upper surface suitable to receive an associated projectile to be shot by the crossbow; first and second limbs supported to the main beam that extend outwardly from proximal ends to distal ends on opposite sides of the main beam; a bowstring that is: strung between the distal ends of the first and second limbs; and, adjustable from an uncocked position to a cocked position; a trigger mechanism supported to the main beam and operable to hold the bowstring in the cocked position and operable to release the bowstring to fire the associated projectile; a crossbow rope reception surface that is longitudinally spaced from the bowstring when the bowstring is in the uncocked position; a manually assisted bowstring drawing mechanism comprising:
a rope having first and second ends;a first handle attached to the first end of the rope;a second handle attached to the second end of the rope; and,an engaging mechanism comprising
a first engaging piece comprising: an engaging piece rope reception portion that receives the rope; a bowstring contact surface; and, a convex portion;a second engaging piece comprising: an engaging piece rope reception portion that receives the rope; a bowstring contact surface; and, a concave portion; wherein the manually assisted bowstring drawing mechanism is manually operable into:
(1) a first condition where: (a) the bowstring is in the uncocked position; (b) the rope between the first and second handles and between the first and second engaging pieces contacts the crossbow rope reception surface; (c) the first handle, the first engaging piece and the first end of the rope are positioned on the first side of the main beam longitudinally between the crossbow rope reception surface and the bowstring; (d) the second handle, the second engaging piece and the second end of the rope are positioned on the second side of the main beam longitudinally between the crossbow rope reception surface and the bowstring; and, (e) the first and second engaging pieces are separated by a distance D2 where D2 is at least W1;(2) a second condition where: (a) the bowstring is in the uncocked position; (b) the rope between the first and second handles and between the first and second engaging pieces contacts the crossbow rope reception surface; (c) the convex portion of the first engaging piece is received in the concave portion of the second engaging piece thereby connecting the first engaging piece to the second engaging piece; (d) the bowstring contact surface of the first engaging piece contacts the bowstring; and, (e) the bowstring contact surface of the second engaging piece contacts the bowstring; and,(3) a third condition where: (a) the convex portion of the first engaging piece remains within the concave portion of the second engaging piece thereby maintaining the connection of the first engaging piece to the second engaging piece; (b) the rope between the first and second handles and between the first and second engaging pieces remains in contact with the crossbow rope reception surface; (c) the bowstring contact surface of the first engaging piece remains in contact with the bowstring; (d) the bowstring contact surface of the second engaging piece remains in contact with the bowstring; and, (e) a tension force applied by an associated user on the first and second handles causes the engaging mechanism to move the bowstring from the uncocked position to the cocked position. |
