Patent ID: 7287680
Filing Date: 2007-10-30
Classification: B25C

Abstract:
1. A nailer for driving a fastener into a workpiece, comprising: a main body defining a fastener ejection channel for accommodating a fastener; a plunger movably carried by said main body and defining a first end for receiving forceful blows and a second end for engaging the fastener, said plunger carrying first ratchet means, said plunger defining a longitudinal cavity extending from said first end towards said second end, said plunger being movable relative to said main body between a first position in which said plunger second end clears said fastener ejection channel, and a second position in which said plunger second end engages said fastener ejection channel for ejecting the fastener from said nailer; a stem member carried by said main body, said stem member penetrating said plunger longitudinal cavity, said stem member carrying second ratchet means capable of unidirectional releasable interlocking engagement with said first ratchet means; and a plunger biasing member continuously biasing said plunger towards said first position; wherein upon a forceful blow being applied to said plunger first end, said plunger will be forced from said first towards said second positions and wherein if said plunger is forced to an intermediate position between said first and said second positions, said first and second ratchet means will cooperate in unidirectional releasable interlocking fashion to retain said plunger in said intermediate position against the bias of said plunger biasing member whereby said plunger may be gradually moved with several forceful blows from said first to said second position without moving back towards its first position until it reaches said second position.