Testing device with acceleration tube

A testing device with an impact body pneumatically acceleratable in an acceleration tube and adapted to be moved out of an exit aperture of the acceleration tube comprising:

• a shutter provided at the exit aperture of the acceleration tube which opens upon the impact of the impact body wherein, in the initial position, the impact body is sealingly retained at the side of the acceleration tube which is located opposite to the exit aperture, and wherein the space in the acceleration tube between the impact body and the exit aperture is operatively connected with a source of negative pressure;
• wherein the impact body is releasably held within a bore extending through an acceleration piston, said acceleration piston being slidable within the acceleration tube in the direction of the exit aperture against an abutment surface of the acceleration tube;
• and
• wherein the impact body has a shearable flange which can be made to abut a contact surface of the acceleration piston, said contact surface being located at that side of the bore that is facing away from the exit aperture.