Patent ID: 7721928
Filing Date: 2010-05-25
Classification: B25C

Abstract:
1. A nail-driving device comprising: a body having a nail ejection portion extending along an axial direction; a nail-striking member movable within said body along said axial direction; an activation switch disposed on said body and having a contact portion, said activation switch being connected to said nail-striking member such that, when said contact portion is moved and thus retracted into said body, said activation switch activates said nail-striking member to move within said body; a trigger unit including a trigger mechanism disposed pivotally on said body and adjacent to said activation switch, and a first resilient member disposed between said body and said trigger mechanism, said trigger mechanism being pivotable on said body between a non-firing position and a firing position, said first resilient member biasing said trigger mechanism toward said non-firing position; and a safety unit including a safety mechanism movable within said nail ejection portion along said axial direction, a force-transmitting member mounted to said safety mechanism and adjacent to said trigger mechanism, and a second resilient member disposed between said body and said safety mechanism, said safety mechanism having a first distal end, a second distal end opposite to said first distal end, said safety mechanism being movable relative to said nail ejection portion along said axial direction between a first position and a second position farther away from said nail ejection portion than said first position, said second resilient member biasing said safety mechanism toward said first position, said force-transmitting member having a connecting end disposed pivotally on said first distal end of said safety mechanism, and a driven end opposite to said connecting end and adjacent to said trigger mechanism, wherein: when said safety mechanism is limited in said first position, and when said trigger mechanism is pivoted to said firing position, said force-transmitting member moves said contact portion so that said contact portion is retracted into said body; and when movement of said safety mechanism between said first and second positions is allowed, and when said trigger mechanism is pivoted to said firing position, said force-transmitting member is driven by said trigger mechanism to move said safety mechanism from said first position to said second position such that said contact portion serves as a fulcrum.