16 the so positioned deployment pin 23 and registerable shank end surface 20 allows for the blade 15 assisted release and full open deployment in the following sequence under user 39 s initial action for assisted blade 15 deployment from the closed position the user not shown engages oppositely disposed thumb lugs 31 indicated by force arrow f which extends from the back blade surface in spaced relation to the shank hook 29 best seen in fig3 of the drawings as noted in the blade closed position the edge corner surface 30 of the blade extension arm 26 is initially engaged on the deployment pin 23 under tension so that once the u201c user u201d initiates the hereinbefore described movement of the thumb lugs 31 the blade 15 rotates as indicated by broken line directional arrows da under spring tension the engagement portion of the deployment pin 23 on the spring arm end edge corner 30 surface travels therealong driving the rotation of the knife blade 15 as seen from broken to solid lines in fig4 of the drawings the rotational momentum imparted thereby propels the blade 15 to fully extended and locked position indicated at 32 as best seen in fig1 of the drawings the blade 15 engages a blade stop pin 33 extending from the handle frame 13 in the shank stop notch 22 while the locking bar 28 free end 29 engages within the shank hook 21 the locking bar 28 is as noted spring urged by the foreshortened spring arm 27 assuring a positive engagement as it travels around the arcuate end edge 20 of the shank portion.