| 摘要 |
PCT No. PCT/SE91/00013 Sec. 371 Date Jul. 9, 1993 Sec. 102(e) Date Jul. 9, 1993 PCT Filed Jan. 9, 1991 PCT Pub. No. WO92/11975 PCT Pub. Date Jul. 23, 1992.An adjustable or similar gripping device includes a shaft and a gripping head which has two jaws, at least one of which is moveable so as to adjust the opening between the jaws of the gripping head. At least one of the jaws has a gear rack which engages a rotatable cog. A spring on the cog urges the jaws into a gripping position. A locking device is provided selectively to prevent movement of the jaw. The locking device includes a locking member which engages between a surface on the cog and a cam located next to the cog. The locking member moves in and out of locking engagement with the cog and the cam. |
