| 摘要 |
PURPOSE:To make easy for assembling and convenient for use by forming a slant on the rear end face of annular grooves of a nut in such a manner as tumblers are retracted while sliding on the slant when the cylinder is inserted and are projected when they are positioned in the annular grooves. CONSTITUTION:The plural number of annular grooves 4 provided with slants 8 are formed, for engaging with tumblers 6, on the internal wall face of an axial cylinder-shaped hole 3 of a nut 2. A cylinder 7, with the plural number of arranged tumblers 6 which are radially projected by energization of a spring, is provided inside a nut cover 5 so as to be capable of racing. Then the tumblers are put in contact with the slants 8 and axially pressed to be retracted in the cylinder 7. Further, when the tumblers 6 are positioned in the grooves 4, they are completely projected to be locked. Due to this, the captioned nut is eased for assembling and made convenient for use. |
