Actuating device of a dynamite gun

An actuating device of a dynamite gun, comprising:

• a barrel member having a rear end with an aperture defined therethrough and at least one pushing rod retractably extending from said rear end of said barrel member;
• a first tube having an end removably contacting said rear end of said barrel member and at least one lug extending radially and outwardly from said end of said first tube, said first tube having a first slot and a first enlarged hole defined through a peripheral wall thereof wherein said first slot communicates with said first enlarged hole;
• a second tube having an end engaged with said rear end of said barrel member with said first tube slidably mounted to said second tube, said second tube having a second slot and a second enlarged hole respectively defined through a peripheral wall thereof, said second enlarged hole communicating with said second slot;
• a bar removably received in said second tube and having a firing pin extending from a first end thereof, a first spring having one of two ends thereof contacting a second end of said bar, a stepped hole defined laterally through said bar, a main spring mounted to said second tube and having one of two ends thereof contacting against said first tube, the other end of said first spring and said main spring being adapted to contact against an inner end of said dynamite gun;
• a function rod movably received in said stepped hole and having a first section, a second section and a third section, wherein the outer diameter of said first section is larger than the width of said second slot and the inner diameter of said second enlarged hole, said width of said second slot is larger than the outer diameter of said second section, said outer diameter of said second section is larger than the width of said first slot, and said width of said first slot is larger than the outer diameter of said third section, said second section extending through said first enlarged hole and said second slot when said pushing rod is completely received in said barrel tube, and
• an actuating member pivotally disposed below said second tube and including a vertical portion and a horizontal portion, said horizontal portion having a first recess and a second recess respectively defined in a top thereof and separated by a protrusion.