| 摘要 |
PURPOSE:To lower a contact pressure per unit area, by providing a rotation- preventing pin between a spherical fulcrum and a socket. CONSTITUTION:Rotation of the socket 15 and a retainer 18 is prevented by the engagement of a projected part 23 into a groove 22. Rotation between the spherical fulcrum 11 and the socket 15 is prevented by the pin 24. The controlling lever 10 is prevented from rotating through the pin 24 and the projected part 23, and a relative vertical movement of the lever 10 and the retainer 18 is enabled by the sliding of the projected part 23 within the groove 22. When the projected part 23 is slidden in the groove 22, the projected part 23 is brought into surface contact with both sides 22a, 22b of the groove 22, whereby the contact pressure per unit area is reduced as compared with a conventional case wherein a line contact is involved. |
