Patent ID: 6119794
Filing Date: 2000-09-19
Classification: B25B

Abstract:
Impact Wrench Structure:a driven wheel being constituted of an integrally formed hollow body with an open slot at its top thereof having two circular holes and two rectangular holes facing against each other in pair formed at respecitive side wall surfaces of said open slot, a pair of pegs being extended rightwardly and leftwardly respectively from both bottom sides of said open slot, a driven gear having a central hole being installed on the rear end surface, and a guide hole being provided at the front end surface;a hammer being positioned in said open slot of said driven wheel by a pin, having a plannar top surface and an arc shaped bottom surface while two bottom ends being formed into two knocking tips, with two corresponding concave slots formed at appropriate positions thereon for accommodation of two balancing weights, a through hole being bored through the center such that when said hammer is captured in said open slot of driven wheel, said through hole is aligned to said two circular holes formed at the side wall surfaces of said open slot;a clutch plate having a pair of stoppers being stretched out of the front and rear sides to be respectively detained in said pair of rectangular holes of said open slots so as to cover on the top surface of said hammer thereby moving range of the same to be limited within said rectangular holes, and a pair of hooks being formed respectively at right and left sides thereof;a pair of coil springs being installed at both sides of said open slot of said driven wheel hooking their one end respectively to said hooks formed at both sides of said clutch plate, while hooking the other end respectively to said pegs formed at both sides of said driven wheel;a motor bracket having a central hole and a hollow axle being extended thereof for connecting to said driven wheel;a reversible motor being settled on said motor bracket and combined to a transmission gear with a motor shaft;a transmission shaft being provided with one terminal formed into a cylindrical axle and the other terminal configured into a square block so as to be fitted to individual adaptor for driving screw-like fixing parts for assembling/detaching an object, and a reception block for transmitting load being provided at an appropriate position thereon;wherein the hollow axle fixed to said motor bracket is installed in said central hole of said driven gear such that said transmission gear connected to said reversible motor can be conjoined with said driven gear to transmit power, and said circular axle at one end of said transmission shaft is hinged to said hollow axle on said motor bracket through said guide hole provided at the front end of said driven wheel so as to settle said reception black of said transmission shaft in said driven wheel, and to face against the arc shaped surface formed at the bottom of said hammer, then a scaling adaptor is covered around said transmission shaft and further said guide hole of said driven wheel is sealed thereby completing an assembled unit of an impact wrench.