Patent ID: 8596372

Claim:
A thermal triggering mechanism for aerosol fire extinguishers comprising: a strike pin that is guided in a sleeve-shaped body; an inner spring that embraces the strike pin and applies force to the strike pin in the direction of a firing cap, wherein one end of the inner spring is stayed on the strike pin and another end of the inner spring is stayed on the body; a locking device that locks the strike pin in a stand-by state and frees it in a free state, wherein the locking device comprises a piston-like pressure plate to which force is applied in a housing by means of an outer spring; and a thermally acting initiating element cooperating with the locking device in such a way that after the initiating element has been triggered the locking device is transferred from the stand-by state into the free state, wherein the initiating element in a stand-by state holds the pressure plate so that it is stationary in opposition to the force of the outer spring; wherein, when the locking device is in the stand-by state, a tension of the inner spring is too low for sufficient acceleration of the strike pin to initiate firing of the firing cap, and, when the locking device is transferred from the stand-by state into the free state, a tension of the inner spring is sufficient for acceleration of the strike pin to the firing cap to initiate firing of the firing cap.