EPOCH-MAKING SCREW AXIAL FORCE CONTROLLING WASHER FOR GENERATING SCREW AXIAL FORCE BY SLIDING UPPER AND LOWER TWO TYPES OF WASHERS TO LIFT UP SEATING SURFACE OF SCREW, ASSURING THE MOST APPROPRIATE FASTENING FORCE AND VISUALIZING TO CONFIRM AXIAL FORCE WITHOUT USING MEASUREMENT TOOL

摘要

PROBLEM TO BE SOLVED: To provide a technology capable of confirming an appropriate fastening force without using tool with measurement tool and generating axial force that is not absolutely loosened.;SOLUTION: A tension force is applied to a bolt 3 in the same manner as that of applying an inputting operation through its rotation since the slant ground contact surfaces of two types of washers 1-1, 2-1 are aligned to each other and an external pressing force action lifts up the head part of the bolt 3 in a direction opposite to that of an item 4 to be fixed. The series of operations enables a visualization to be instantly carried out to confirm a state of occurrence of an axial force in the same manner as that of using a measurement tool such as a torque wrench, for example, during fastening of the bolt 3. The washers 1-1, 2-1 are characterized in that they may have a function enabling themselves to be monitored and fastened differing from fastening in reference to a so-called feeling of loosed state.;COPYRIGHT: (C)2015,JPO&INPIT