| 摘要 |
A damper device comprises first and second cylinders which are adjacent and rotatable with respect to each other and have respective hinge pieces, a piston operation member provided in the first and second cylinders in such a manner that it is rotatable with respect to the first cylinder, a piston member to which is fitted a pressure control member which is provided with a multithread section on the outer wall thereof and with a through-hole in the central portion thereof and a through-hole having a check valve, and a plurality of chambers provided in the second cylinder the chambers being divided into the upper and lower chambers by the piston operation member. These chambers are communicated with the through-holes, and a cylinder with a bottom is fitted to the piston member. A plurality of protruded sections, each having predetermined length, width and height, corresponding to the thread grooves of the multi-thread section are formed on the cylinder with the bottom by pressing, so that the rotation around the axis and the vertical movement of the piston member is effected in the cylinder with the bottom. |
