Patent ID: 7040561

Claim:
A spice grinder, comprising: a cylinder body with a top and a bottom, a cylinder cover being provided on the top and a cylinder bottom being detachably connected to the bottom; an L-grooved barrel in the cylinder body, the barrel having an L-groove on a side thereof and a stepped bole formed in a bottom thereof, the L-groove having a lower cross groove; a top cap; a pressure drum connected to the top cap, the pressure drum being slidably mounted in the L-grooved barrel, the pressure drum being divided into an upper space and a lower space by a baffle, the lower space being closed by a cover plate, the baffle and the cover plate having a coaxial central through-hole, the pressure drum having a projection on a circumferential side thereof, the projection being guided in the L-groove of the L-grooved barrel such that when it follows a rotation of the pressure drum it enters the lower cross groove of the L-groove, thus keeping the pressure drum in position; a ∞-shaped open-end long tube provided in the lower space of the pressure drum and being able to rotate in the pressure drum and the through hole of the cover plate, the ∞-shaped open-end long tube having a flange that is upwardly and downwardly moveable in the lower space of the pressure drum such that when it reaches the cover plate of the pressure drum, its rotation is limited by a braking means provided between an upper surface of the flange and a lower surface of the baffle; a screw-shaped long axis assembly rotatably located in the stepped hole of the L-grooved barrel, a screw-shaped long axis on one end of the screw-shaped long axis assembly being engaged with an internal thread of the ∞-shaped open-end long tube, such that when the ∞-shaped open-end long tube moves downwardly with the pressure drum, the screw-shaped long axis is rotatable in one direction, and when the ∞-shaped open-end long tube moves upwardly with the pressure drum, the ∞-shaped open-end long tube is caused to rotate about the screw-shaped long axis in a reverse direction, an opposed end of the screw-shaped long axis assembly being provided with a pinion; a compression spring provided between a seat of the L-grooved barrel and a bottom of the pressure drum, the compression spring biasing the pressure drum upwardly; a gear-toothed ring transmission mechanism provided in the cylinder body and positioned under the L-grooved barrel, the transmission mechanism connected transmissively with the pinion of the screw-shaped long axis assembly to obtain a driving force of high torsion moment; and a grinding plate assembly provided on the cylinder bottom, the grinding plate assembly being connected with the gear-toothed ring transmission mechanism and being driven by the gear-toothed ring transmission mechanism to rotate in one direction for grinding spices.