Exhaust system for combustion-powered fastener-driving tool

B - Operations – Transporting – 25 – C

Patent

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Details

B25C 1/08 (2006.01)

Patent

CA 2553118

A combustion-powered fastener-driving tool (10) includes a combustion powered power source (14) including a cylinder (20) defining a path for a reciprocating piston (22) and an attached driver blade (24), the piston (22) reciprocating between a pre-firing position achieved prior to combustion and a bottom out position. Upon combustion in the power source (14), the cylinder (20) includes at least one exhaust valve (52) configured for releasing combustion gases from the cylinder (20). The at least one exhaust valve (52) is dimensioned so that sufficient gas is released to reduce post-combustion pressure in the cylinder (20) to approximately one atmosphere in the time available for the piston (22) to travel past the at least one exhaust valve (52) and return to the at least one exhaust valve (52).

La présente invention a trait à un outil d'entraînement d'attaches à combustion (10) comportant une source d'énergie à combustion (14) comprenant un cylindre (20) définissant un trajet pour un piston alternatif (22) et une lame d'entraînement fixé (24), le piston (22) effectuant un mouvement alternatif entre une position préalable à l'allumage produit avant la combustion et une position de passage creux. Lors de la combustion dans la source d'énergie (14), le cylindre (20) comporte au moins une soupape d'échappement (52) agencé pour la libération de gaz de combustion depuis le cylindre (20). Ladite au moins une soupape d'échappement (52) est dimensionnée de sorte qu'une quantité de gaz suffisante soit libérée pour réduire la pression post-combustion dans le cylindre (20) à environ une atmosphère dans le temps disponible pour le piston (22) de dépasser au moins ladite une soupape d'échappement (52) et de retourner à ladite au moins une soupape d'échappement (52).

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