High velocity, combustion-powered fastener-driving tool

B - Operations – Transporting – 25 – C

Patent

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Details

B25C 1/14 (2006.01)

Patent

CA 2255102

Disclosed is a combustion-powered, fastener-driving tool comprising structure defining a combustion chamber having a combustion chamber volume, structure defining a piston chamber communicating with the combustion chamber, a driving piston movable within the piston chamber between an initial position and a terminal position, and a driving blade mounted to the driving piston so as to be conjointly movable with the driving piston. The driving piston, the driving blade, and the piston chamber are arranged so that combustion in the combustion chamber imparts energy to the driving piston and the driving blade so as to drive the driving piston and the driving blade from the initial position toward the terminal position, through a piston displacement volume, with the driving blade preceding the driving piston. The ratio of the piston displacement volume to the combustion chamber volume is sufficient to enable the driving blade to transfer more than one half of the maximum, transferable energy to a fastener engaged by the driving blade as the driving piston and the driving blade approach the terminal position. Preferably the ratio is sufficient to enable the driving blade to transfer more than eight tenths of the maximum, transferable energy to a fastener engaged by the driving blade as the driving piston and the driving blade approach the terminal position.

La présente invention a pour objet un outil à combustion servant au vissage d'éléments de fixation; l'outil en question comporte une chambre de combustion, une structure définissant un cylindre de piston en communication avec la chambre de combustion, un piston animé d'un déplacement entre une position initiale et une position finale, et un embout de tournevis entraîné par le piston et solidaire du mouvement imprimé au piston. Le piston, l'embout de tournevis et la chambre de combustion sont configurés de manière à transmettre l'énergie résultant de la combustion à l'intérieur de la chambre de combustion et du volume de déplacement du piston au piston et à l'embout de tournevis, de façon à déplacer l'embout de tournevis entre une position initiale et une position finale. Le rapport entre le volume de déplacement du piston et le volume à l'intérieur de la chambre de combustion assure la transmission de plus de la moitié de l'énergie maximale pouvant être transmise à un élément de fixation lorsque l'embout de tournevis atteint la position finale. De préférence, le rapport est de nature à permettre à l'embout de tournevis de transférer plus de quatre-vingts pour cent de l'énergie maximale transmissible à l'élément de fixation entraîné par l'embout lorsque le piston et l'embout parviennent à leur position finale.

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