公开(公告)号：JPH04310390A

公开(公告)日：1992-11-02

申请号：JP3083792

申请日：1992-02-18

Applicant: ESSILOR INT

Inventor： JIYORUJIYU FUASHIYUURU

IPC: B25J15/08 ,  B23Q1/76 ,  B24B13/00 ,  B24B13/005 ,  B25B5/06 ,  B25B5/14 ,  B25J15/10

Abstract: PURPOSE: To provide a device capable of grasping a weak circular object with accurate centering. CONSTITUTION: A nearly circular object grasping and clamping device is provided with a central main body 2 provided with three grasping and clamping elements 10, 11, 12 for supporting a circular material at the tangent in three areas 13, 14, 15 of a pair of tangent contact formed with an angle larger than 90 degree. The grasping and clamping element 10 is arranged on the axis of the central main body 2 at one end of a movable push rod 18. The other two elements 11, 12 are symmetrically arranged at the ends of two levers 8, 9 formed of a clamping arm 33 and an operating rod 34. The push rod 18 is energized in the axial clamping direction by at least one clamping spring. The other two elements 11, 12 are turned in the clamping direction by at least one lever operation exciting spring 52. Clamping is released by applying hydraulic pressure to a piston to be operated in the opposite direction to the clamping spring.