the tiller on which the bow l 2 is mounted has a cocking lever in the form of two arms an upper arm 1 and a lower arm 2 which are pivotably connected about an axis x in the front part of the tiller the upper arm 1 has a projectile guide 3 which abuts a butt bracket 4 through which the upper arm 1 is connected with the butt 5 in the rear part of the tiller the upper arm 1 is connected with the upper end of a butt 5 and said lower arm 2 is connected in the folded state of the tiller with the lower end of the butt 5 by means of a rear snap fastener 6 the rear snap fastener 6 is formed by a finger 7 a on the butt 5 and a hook 7 b at the end of the lower arm 2 a trigger mechanism 8 described with details further below is situated between the arms 1 and 2 in the folded state of a tiller the trigger mechanism 8 is connected with the lower arm 2 by means of a front snap fastener 9 the front snap fastener 9 consists of a finger 10 a.