Gas-operated apparatus with combustion chamber

摘要

Apparatus comprising a casing, a cylinder head, a chamber sleeve tube designed to form with the cylinder head a combustion chamber when the apparatus is pressed against a work surface, a cylinder and a piston designed to be propelled by the explosion of a mixture of air and gas in the chamber and to drive an element, the posterior part of the casing being designed to form a cooling air intake for cooling the apparatus and venting the chamber and isolating means being mounted on the chamber sleeve tube so as to isolate the space formed between the anterior part of the chamber sleeve tube and the casing from the combustion chamber when the apparatus is opened, wherein means are provided for ducting the cooling and venting fresh air directly towards the chamber when said apparatus is opened.