Patent ID: 7275486

Claim:
A hand grenade simulating device comprising: a first shell defining a first accommodation space therein and a first access opening for accessing said first accommodation space; a second shell received in said first accommodation space by extending through said first access opening, and including a bottom wall with a periphery, and a surrounding wall extending from said periphery of said bottom wall in a longitudinal direction to define a second accommodation space therein and to terminate at a peripheral edge which extends outwardly of said first access opening, and which defines a second access opening for accessing said second accommodation space, said bottom and surrounding walls being made from a material such that when a pressure in said second accommodation space increases to a predetermined value, said bottom and surrounding walls burst; a marking filler disposed within said first accommodation space such that said marking filler is dispersed in response to bursting of said bottom and surrounding walls of said second shell; a percussion-triggered charge disposed in said second accommodation space proximate to said bottom wall, and spaced apart from said peripheral edge; a striking member disposed in said second accommodation space, and having an upper retained end and a lower striking end opposite to each other in the longitudinal direction, and a shank interposed therebetween, said striking member being movable relative to said bottom wall in the longitudinal direction between a ready position where said lower striking end is remote from said percussion-triggered charge, and a striking position where said lower striking end strikes said percussion triggered charge to initiate detonation, thereby increasing the pressure in said second accommodation space to the predetermined value to explode said first and second shells for scattering said marking filler; a biasing member disposed to bias said striking member toward the striking position; a releasably retaining member which is disposed to hold said striking member in the ready position by virtue of engagement with said upper retained end against biasing force of said biasing member, and which is manually releasable; and a delay member disposed to generate a kinetic frictional force between said shank and said surrounding wall when said striking member is moved from the ready position to the striking position such that said striking member is dragged by the kinetic frictional force against the biasing force of said biasing member when said releasably retaining member is released.