Patent ID: 6604664
Filing Date: 2003-08-12
Classification: B25C

Abstract:
A pneumatic fastener driving tool having a magazine housing a plurality of fasteners to be driven, comprising:a source of compressed air; a main valve for causing the firing of a fastener from a tool magazine when said main valve is vented to atmosphere; a pilot valve assembly comprising a pilot valve member movably mounted upon said pilot valve assembly between a first position at which a first fluid flow path from said source of compressed air to said main valve is defined within said pilot valve assembly so as to permit pressurization of said main valve with said compressed air in preparation for firing a fastener from the tool magazine, and a second position at which a second fluid flow path from said main valve to atmosphere is defined within said pilot valve assembly so as to permit venting of said compressed air from said main valve when a fastener from the tool magazine is to be fired; a tool trigger movable between depressed and released states; a workpiece contact element movable between depressed and released states; and fluid flow control means for enabling said tool to fire a fastener during a first fastener-firing operational cycle of said tool only if said workpiece contact element is sequentially depressed prior to the depression of said tool trigger, for enabling said tool to fire a fastener during a fastener-firing operational cycle of said tool subsequent to said first fastener-firing operational cycle of said tool regardless of the sequence in which said tool trigger is depressed with respect to the depression of said workpiece contact element, and for disabling said tool such that said tool cannot fire a fastener during an intended fastener-firing operational cycle of said tool if subsequent to said first fastener-firing operational cycle of said tool, said work-piece contact element is not moved to its depressed state within a predetermined period of time.