Abstract: An improved structure of a hand-saw having adjustable sawing blade includes two holding sections, a front and a rear holding section, a sawing blade, a front-mounted ratchet teeth fine tuning block having one end with four teeth ratchet, 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, a hexagonal pull-push engaging connector module having a circular shape center and a cavity adaptable to a hexagonal shape screw nut, 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 reces

Abstract: An improved structure of a hand-saw having adjustable sawing blade includes two holding sections, a front and a rear holding section, a sawing blade, a front-mounted ratchet teeth fine tuning block having one end with four teeth ratchet, the other end there of 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, a hexagonal pull-push engaging connector module having a circular shape center and a cavity adaptable to a hexagonal shape screw nut, 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 rece

Abstract: An improved structure of a penknife is disclosed.

Abstract: A structure of multi-directional, combination-type ratchet wheel wrench with sleeve is disclosed.

Abstract: A screw driver includes a hand grip having a driving stem extended forward from the hand grip, and a slide slidably engaged in the hand grip and rotated in concert with the hand grip. A handle is pivotally coupled to the slide at a pivot shaft for allowing the handle to be rotated relative to the slide and the hand grip to a perpendicular position relative to the hand grip and for allowing the hand grip and the driving stem to be rotated by the handle via the slide. The handle may include a retractable pole slidably engaged in a tube which is pivotally coupled to the slide.

Abstract: A ratchet tool includes a housing having a pair of protrusions oppositely extended inward of a chamber for forming two pairs of parallel channels. A gear is rotatably received in the chamber of the housing and has a driving shaft extended outward of the housing. Two pairs of pawls are slidably engaged in the channels and biased to engage with the gear for allowing the housing to drive the gear. The gear may be selectively driven in an active direction or in a reverse direction when one pair or the other pair of the pawls are disengaged from the gear.

Abstract: A ratchet tool includes a housing having an oval inner peripheral surface, and a core rotatably engaged in the housing for forming two curved slots between the housing and the core. The curved slots each includes two narrower end portions and a wider middle portion. Two pairs of wedges are slidably engaged in the curved slots and are biased to engage with the narrower ends for allowing the housing to drive the core. The wedges may be selectively moved toward the wider middle portions for allowing the housing to be rotated relative to the core in a reverse direction.

Abstract: An adjustable wrench includes a head formed on one end of a tube and having an opening for slidably receiving an engaging member. The tube has a bore communicating with the opening for rotatably and slidably receiving a rod. The rod is threadedly engaged with the head for moving the engaging member toward and away from the tube for allowing the engaging member to engage with fasteners of different sizes. A handle is secured to the rod for rotating the rod and for moving the engaging member toward and away from the fastener.

Abstract: A screw driver includes a rod slidably and rotatably received in a hand grip and having one end for engaging with a tool bit. A handle has one end pivotally coupled to the rod for allowing the handle to rotate to a position perpendicular to the rod and for allowing the handle to apply a great torque to the rod and for allowing the tool bit and the rod to be easily operated. The handle includes a pole pivotally coupled to the rod and a sleeve engaged on the pole. The sleeve has an annular flange for engaging with an enlarged head of the pole and for limiting a relative movement between the pole and the sleeve.

Abstract: A saw blade adjusting mechanism, which includes a first tightening up rod and a second tightening up rod fastened to the frame assembly of a hack saw at two opposite ends by nuts to hold the saw blade, a rotary adjusting knob mounted around the first tightening up rod and forced by a first spring to mesh with a toothed through hole on the front end of the frame assembly of the hack saw, a gear mounted around the second tightening up rod and forced by a second spring to disengage from the locating block, wherein the first and second tightening up rods are moved synchronously when the rotary adjusting knob is turned to change the angular position of the saw blade.

Abstract: Disclosed is a saw blade adjusting device including an adjusting link fastened to a handle to hold either end of a saw blade, a toothed locating block fastened to a front block of the handle, a gear mounted on a rectangular block on the adjusting link and releasably meshed with the toothed locating block, and a spring mounted on the adjusting link and stopped between the gear and the handle, wherein the gear can be moved backwards along the adjusting link to disengage from the toothed locating block, then rotated in either direction to turn the saw blade through 360.degree. angle via the adjusting link, and then moved back to its former position in mesh with the toothed locating block to hold the adjusting link in keeping the saw blade at the adjusted angular position.