Patent ID: 8869905

Claim:
A fire extinguisher with an actuation mechanism, comprising: a fire extinguisher body filled under pressure with a fire suppressant in a manner forcibly causing the fire suppressant to be expelled from the fire extinguisher with substantial force upon release: an actuation mechanism secured to the fire extinguisher body for controlling expulsion of the fire suppressant from the fire extinguisher body, the actuation mechanism includes: a pneumatically controlled activation piston assembly that functions to control the release of the fire suppressant until desired by the user of the fire extinguisher, the activation piston assembly includes a housing in which a piston is positioned, the housing includes a first end and second end, the first end of the housing is covered with a first cap supporting a spring interposed between the piston and the first cap, and the second end of the housing is provided with a second cap; the piston, under the control of balanced spring bias and pneumatic pressure, allows for time controlled release of the fire suppressant from the fire extinguisher body, wherein the piston includes a first end and a second end, the first end of the piston is shaped and dimensioned for engaging an end of the spring opposite the first cap at the first end of the housing, which spring biases the piston toward the second end of the housing, and wherein the second end of the piston includes a cup seal shaped and dimensioned for engaging an inner wall of the housing in manner defining a substantially sealed lateral compartment in the housing between the second end of the piston and the second cap.