Fastener driving device having full cycle valve

B - Operations – Transporting – 25 – F

Patent

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Details

B25F 5/00 (2006.01) B25C 1/04 (2006.01) B25D 9/00 (2006.01)

Patent

CA 2204710

A pneumatically operated fastener driving device includes a pilot pressure operated main valve movable from a normally closed position into an opened position closing an exhaust path and allowing a supply of air under pressure to be communicated with a piston chamber to initiate and effect the movement of a piston and fastener driving element through a fastener drive stroke. First passage structure is provided between a pilot pressure chamber and an exhaust port. A secondary valve member is mounted with respect to the first passage structure so as to be movable between an opened position permitting communication between the pilot pressure chamber and the exhaust port and a closed position preventing communication between the pilot pressure chamber and the exhaust port. Second passage structure communicates the piston chamber with the secondary valve member and with the exhaust path. An operative cycle is initiated upon actuating a trigger member to exhaust pilot pressure in the pilot pressure chamber through the exhaust port causing the main valve to move to its opened position thereby initiating the fastener drive stroke. Pressure over the drive piston in the piston chamber communicates with the secondary valve member to move the secondary valve member to its closed position preventing communication between the pilot pressure chamber and the exhaust port thereby causing the main valve to move to its closed position. The secondary valve member permits one full cycle of operation to be performed while the trigger member remains actuated thereby minimizing exposure of the fastener driving element and thus, damage thereto.

Cette invention concerne un élément cloueur à commande pneumatique qui comprend un clapet commandé par pression pilote et mobile entre une position normalement fermée et une position ouverte où il obture une voie d'échappement et laisse entrer une charge d'air comprimé dans un cylindre pour imprimer au piston et à l'élément cloueur la course de clouage prévue. Un premier passage est prévu entre une chambre à pression pilote et une lumière d'évacuation. Un clapet secondaire est disposé par rapport à ce premier passage de manière à pouvoir se déplacer entre une position ouverte où il met en communication la chambre à pression pilote et la lumière d'évacuation et une position fermée où elle isole l'un de l'autre les deux éléments précités. Un deuxième passage relie le cylindre au clapet secondaire et à la voie d'échappement. Un cycle de travail s'amorce avec la manoeuvre d'une détente pour ouvrir la lumière d'évacuation et laisser la pression pilote qui règne dans la chambre à pression pilote agir sur le clapet principal pour l'ouvrir et lancer ainsi la course de clouage. La pression agissant sur le piston dans le cylindre referme en même temps le clapet secondaire, empêchant de la sorte la communication entre la chambre à pression pilote et la lumière d'évacuation, ce qui entraîne la refermeture du clapet principal. Le clapet secondaire autorise un cycle complet pendant que la détente reste enfoncée, ce qui réduit le temps d'exposition de l'élément cloueur et les risques d'endommagement.

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