Nailing depth adjusting device of a palm-type nail gun

A nailing depth adjusting device of a palm-type nail gun, comprising:

• a hammer rod including a predetermined nailing distance, being slidably engaged in a gun body of the nail gun to do a reciprocating movement driven by a high-pressure air;
• an end base provided in one end of said gun body, inside of the end base being dented to form a containing recess, inside of the containing recess being provided with a center opening for the hammer rod to go through during the reciprocating movement, a recess wall of the containing recess being dented to form at least one independent guiding indentation adjacent to the center opening, inside of the guiding indentation being provided with an indentation channel in a same direction with the reciprocating movement of the hammer rod;
• a lock ring being secured to a bottom of the end base;
• an adjusting sleeve, rotating in situ by the limitation of the lock ring, one end of the adjusting sleeve being pivotally installed inside of the containing recess, the other end of the adjusting sleeve being exposed outside of the gun body, a sleeve opening being provided between the two ends of the adjusting sleeve for the hammer rod to go through, inside wall of the sleeve opening adjacent to the guiding indentation being provided with internal threads;
• a guiding piece movable in the direction of the movement of the hammer rod, outside of the guiding piece being provided with external threads mated with internal threads to connect the guiding piece to the adjusting sleeve, one end of the guiding piece being provided with at least one independent guiding pillar, the guiding pillar being slidably engaged in the indentation channel, the other end of the guiding piece being provided with a flat limiting end, an aperture being provided between the two ends of the guiding piece for the hammer rod to go through, the position of the limiting end being control by rotating the adjusting sleeve;
• and
• a conduit being slidably engaged in the sleeve opening and being pushed by an elastic force, the conduit being provided for the hammer rod to go through, the conduit including a flat pushing end concealed in the sleeve opening and a shooting end exposed outside of the adjusting sleeve, the shooting end being able to touch a surface of a work piece and causing the pushing end to move until touching the limiting end and thereby controlling the nailing depth of the hammer rod.