PCT No. PCT/DE89/00533 Sec. 371 Date Apr. 13, 1990 Sec. 102(e) Date Apr. 13, 1990 PCT Filed Aug. 14, 1989 PCT Pub. No. WO90/02309 PCT Pub. Date Mar. 8, 1990.The invention relates to an impact fuse (2) having fore-bore safety for a projectile (1), comprising a percussion needle (3) stationary on the fuse and an impact body (4) containing a percussion cap (5) and supported slidingly in the direction of flight, as well as a race for a blocking ball (23) between the impact body and the inner wall of the projectile casing. Which, upon premature impact on an obstacle, is jammed in its race (22) between a shoulder (18, 19, 20) on the inner wall of the casing and a ramp (17) of a groove (14, 15, 16) on the impact body (4), thereby preventing detonation. In order to allow for adjustment of predefined distances for the fore-bore safety, the invention proposes giving the race (22) for the blocking ball (23) a stepped design so that the blocking ball (23) can be jammed at several places within the fuse (2) between shoulders (18, 19, 20) and ramps (17) of different grooves (14, 15, 16).
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