Patent ID: 7766205

Claim:
Manually controlled and gas-operated tool, comprising: a cylinder; a combustion chamber at a rear of the cylinder for receiving a combustible mixture; a spark plug for igniting the combustible mixture injected into the combustion chamber; a fastener guide at a front of the cylinder for guiding a fastener into a material to be fastened, said fastener guide being retractable upon abutment with the material for closing the combustion chamber; a trigger mechanism for controlling the spark plug to fire the tool; a piston slidably mounted inside the cylinder for driving the fastening element forward through the fastener guide, under the action of the explosion inside of the combustion chamber of the mixture of gas and air that has been injected therein after retraction of the fastener guide and closing of the combustion chamber, followed by actuation of the trigger mechanism for controlling the spark plug to fire the tool; a locking element for locking the firing of the tool; and a rate determining element for determining if the rate of fire of the tool is in excess of an acceptable limit, and activating the locking element for locking the tool in response to said determination.