engaged with a screw shaped long axis assembly provided rotatably in the l grooved barrel so that when the u221e shaped open end long tube moves downwardly with the pressure drum the screw shaped long axis is caused to rotate in a certain direction the other end of the screw shaped long axis assembly being provided with a pinion a compression spring being provided between the seat of the l grooved barrel and the bottom of the pressure drum a gear toothed ring transmission mechanism being provided beneath the l grooved barrel a grinding plate assembly being provided on the cylinder bottom and being driven by the gear reduction apparatus to rotate in one direction to grind spices or peppercorns the peppercorn grinder can be either operated with two hands or operated on a table with a single hand and can grind peppercorns only by pushing down the top cap gently moreover the top cap can be free running of step change with a braking action relative to the pressure drum without interfering with normal operation application_number US 35256103 A description referring to fig1 and fig2 the main members of the peppercorn grinder according to the invention are shown the peppercorn grinder comprises a top cap 1 a pressure drum 2 connected with the top cap 1 the pressure drum 2 being inserted into a cylinder body 3 provided on its outer surface with a curved portion for comfortable holding by a user the cylinder body 3 being covered by a cylinder cover 31 and the cylinder body 3 being connected with a cylinder.