Abstract not available for EP0258275 Abstract of corresponding document: WO8705064 Demolition apparatus (60) which is attached to a movable boom-like member (20) of a machine. The demolition apparatus (60) includes support structure (64) which carries a power plunger (68) and an actuator plunger (80). The plungers (68, 80) are mounted in adjacent relationship and are movable with respect to the support structure (64). A compression spring (76) urges the power plunger (68) in a direction from the support structure (64). The actuator plunger (80) includes a latch device (86) which engages a portion (72) of the power plunger (68). In operation, the support structure (64) is moved toward a surface to be demolished. The actuator member (80) engages the surface and remains fixed as the support structure (64) continues to move toward the surface. Therefore, as this occurs, there is relative movement between the support structure (64) and the actuator plunger (80). A latch (86) carried by the actuator plunger (80) engages a part (72) of the power plunger (68) and retains the position of the power plunger (68) with respect to the actuator plunger (80). Therefore, movement of the support structure (64) toward the surface is opposed by the spring (76), and compression forces of the spring (76) increase as such movement occurs. As the support structure (64) is moved toward the surface, an abutment member (90) carried by the support structure (64) engages the latch (86) and releases the latch (86) from engagement with the power plunger (68). Thus, the power plunger (68) is released for rapid movement by the spring (76), and the power plunger (68) strikes the surface for demolition thereof.