Crossbow

Abstract

A crossbow includes a riser. The crossbow includes a first limb and a second limb. The first limb includes a first end and a second end. The second limb includes a first end and a second end. The first end of the first limb and the first end of the second limb are coupled to the riser. A first wheel is rotatably coupled to the first limb proximate the second end thereof. A second wheel is rotatably coupled to the second limb proximate the second end thereof. The crossbow includes a first power cord that includes a first end coupled to the riser and a second end coupled to the first wheel. The crossbow includes a second power cord a first end coupled to the riser and a second end coupled to the first wheel. The crossbow includes a bowstring. The crossbow includes an efficiency of at least 80%.

1 . A crossbow, comprising:
 a riser;   a first limb and a second limb,
 wherein the first limb comprises a first end and a second end; 
 wherein the second limb comprises a first end and a second end; 
 wherein the first end of the first limb and the first end of the second limb are coupled to the riser; 
   a first wheel rotatably coupled to the first limb proximate the second end thereof;   a second wheel rotatably coupled to the second limb proximate the second end thereof; and   a first power cord, comprising:
 a first end coupled to the riser; 
 a second end coupled to the first wheel; and 
   a second power cord, comprising:
 a first end coupled to the riser; 
 a second end coupled to the first wheel; and 
   a bowstring;   wherein the crossbow comprises an efficiency of at least 80%.   
     
     
         2 . The crossbow of  claim 1 , wherein the crossbow is a reverse draw crossbow. 
     
     
         3 . The crossbow of  claim 1 , wherein the crossbow comprises an energy storage system. 
     
     
         4 . The crossbow of  claim 3 , wherein the energy storage system comprises the first limb, the second limb, the first wheel, the second wheel, the first power cord, the second power cord, and the bowstring. 
     
     
         5 . The crossbow of  claim 1 , wherein the crossbow comprises an efficiency of 80% to 100%. 
     
     
         6 . The crossbow of  claim 1 , wherein the crossbow comprises an efficiency of 80% to 90%. 
     
     
         7 . The crossbow of  claim 1 , wherein the crossbow comprises an efficiency of 80% to 85%. 
     
     
         8 . The crossbow of  claim 1 , wherein the crossbow comprises an efficiency of 83%. 
     
     
         9 . The crossbow of  claim 1 , wherein the crossbow has a bowstring draw length of 15 inches. 
     
     
         10 . The crossbow of  claim 1 , wherein the crossbow has an intermediate position that is 9 inches from an un-cocked position. 
     
     
         11 . The crossbow of  claim 1 , wherein a distance between a cocked position and an un-cocked position is 15 inches. 
     
     
         12 . The crossbow of  claim 1 , wherein a draw-force of the crossbow is at least 240 lb f  at an intermediate position that is 9 inches from an un-cocked position. 
     
     
         13 . The crossbow of  claim 1 , wherein the crossbow is configured to provide a kinetic energy of at least 170 ft-lb f  for an arrow/bolt weighing  403  grains. 
     
     
         14 . A crossbow, comprising:
 an energy storage system; and   a riser,   wherein the crossbow comprises an efficiency of at least 80%.   
     
     
         15 . The crossbow of  claim 14 , wherein the energy storage system comprises:
 a first limb and a second limb,
 wherein the first limb comprises a first end and a second end; 
 wherein the second limb comprises a first end and a second end; 
 wherein the first end of the first limb and the first end of the second limb are coupled to the riser; 
   a first wheel rotatably coupled to the first limb proximate the second end thereof;   a second wheel rotatably coupled to the second limb proximate the second end thereof; and   a first power cord, comprising:
 a first end coupled to the riser; 
 a second end coupled to the first wheel; and 
   a second power cord, comprising:
 a first end coupled to the riser; 
 a second end coupled to the first wheel; and 
   a bowstring.   
     
     
         16 . The crossbow of  claim 14 , wherein the crossbow comprises an efficiency of 80% to 100%. 
     
     
         17 . The crossbow of  claim 14 , wherein the crossbow comprises an efficiency of 80% to 90%. 
     
     
         18 . The crossbow of  claim 14 , wherein the crossbow comprises an efficiency of 80% to 85%. 
     
     
         19 . The crossbow of  claim 14 , wherein the crossbow comprises an efficiency of 83%. 
     
     
         20 . The crossbow of  claim 14 , wherein the crossbow is a reverse draw crossbow.