Patent ID: 7513403
Filing Date: 2009-04-07
Classification: B25C

Abstract:
1. An idle driving operation preventing device in a fastener driving tool, the fastener driving tool comprising: a tool body defining a fastener driving channel and having a driver for driving fasteners supplied into the fastener driving channel, so that the fasteners are driven into a workpiece by the driver, the fasteners being arranged in parallel with each other and joined together; an operation member mounted to the tool body and operable to move from a first position to a second position in order to actuate the driver; a magazine arranged and constructed to store the fasteners; a pusher disposed within the magazine and movable in a fastener feeding direction; wherein the pusher is biased in the fastener feeding direction by a first spring, so that the fasteners are supplied into the fastener driving channel one after another by a first biasing force applied by the first spring via the pusher; the idle driving operation preventing device being operable to prevent the driving operation of the driver when all the fasteners within the magazine have been driven or when the number of the fasteners within the magazine has been reduced to a predetermined number, and the idle driving operation preventing device comprising; an engaging member disposed on the pusher; a second spring arranged and constructed to apply a second biasing force to the engaging member in the fastener feeding direction; wherein the second biasing force is smaller than the first biasing force; and a stopper member mounted to the operation member and movable to enter a moving path in the fastener feeding direction of the pusher, so that the engaging member can engage the stopper member in order to inhibit the movement of the operation member from the first position to the second position when all the fasteners within the magazine have been driven or when the number of the fasteners within the magazine has been reduced to a predetermined number.