the latch bolt slots 204 with flexible tab 194 during the sliding process of trigger cap 114 from locked position and unlocked position long cap shaft 152 is continuously pressed by flexible tab 194 this improves preferable contact between trigger cap 114 and latch bolt 118 with a flexible tab those skilled in the art will realize and understand upon reading this description that other and or different mechanisms may be used to fulfill this curve sliding track and preferable contact since in the locked position base stopping pin 180 shown in fig5 and latch stopping pin 196 shown in fig6 contacts with each other on their inclined surface when a force is pushing trigger cap 114 toward front wall 134 latch stopping pin 196 is able to pass the limitation of base stopping pin 180 if the force is larger than the resistant force from base stopping pin 180 therefore latch bolt 118 can be actuated not only by actuator 120 but also by trigger cap 114 manually fig1 a d show an acting process of latch mechanism 100 fig1 a depicts a locked position of latch mechanism 100 latch bolt 118 extends out of housing 110 and is received by latch bolt receiver 125 on latch keeper 126 actuator 120 is in a retracted position and resisted by bevel wall 128 shown in fig2 on latch keeper 126 one embodiment of latch mechanism 100 is.