String bumper for arrow-propelling apparatus

A bumper for limiting a string displacement on a projectile accelerating apparatus and absorbing vibrations thereof, the projectile accelerating device comprising:

• a pair of limbs operatively connected with the string to propel a projectile,
• the bumper comprising:
• a hollowed body including
• an opening portion at a first end of the body, the opening portion including a first diameter opening inside the body;
• an expansion portion inside the hollowed body and adjacent to the opening portion, the expansion portion widening the first diameter opening inside the hollowed body;
• a damper portion adjacent to the expansion portion inside the hollowed body, the damper portion extending to a distal wall thereof, the damper portion including a compressible cavity containing volume of gas therein;
• an opening between the cavity and the environment for allowing communication between the cavity and the environment;
• and
• a string-contacting portion disposed on an exterior surface of a second end of the body, adjacent to the distal wall and the damper portion, the damper portion being adapted to compress the volume of gas in the damper portion in consequence of a string contact on the string-contacting portion, when the bumper is secured to the projectile accelerating apparatus in an operative position.