Structure of a hand-saw

An improved structure of a hand-saw having adjustable sawing blade comprising:

• two holding sections, a front and a rear holding section, the lower end of the front section being a circular hole having provided with a plurality of ratchet teeth at the internal edge thereof and the bottom section of the rear holding section being provided with a cavity, and an interlinking rod connected the front and the rear holding section;
• a sawing blade;
• a front-mounted ratchet teeth fine tuning block having one end with four teeth ratchets, the other end thereof being a semicircular and having a protruded cylindrical bar for the insertion of the sawing blade;
• a ratchet teeth adjusting sleeve being cylindrical shape having one end with inner edge being ratchet teeth shape, and the other end thereof being a larger internal radius;
• a rear-mounted ratchet wheel fine tuning block having an external edge with four ratchet teeth for engagement with the ratchet-teeth adjusting sleeve for the insertion of the other end of the sawing blade and the rear end section being extended to form a cylindrical section provided with a screw hole thereto;
• a hexagonal pull-push engaging connector module having a circular shape center and a cavity adaptable to a hexagonal shape screw nut, the protruded cylindrical pole being connected with a supplemental nut by a C-ring;
• and
• a loosening button located at the root section of the rear holding section being an arch-shaped body and having a gripping section provided with a recessed arch for better gripping in the course of turning the button, thereby the button is used to adjust the fine tune angle of the hexagonal screw nut.