Patent ID: 7152475
Filing Date: 2006-12-26
Classification: G01L,G01N

Abstract:
1. An axial bolt force measuring instrument for measuring an axial force of a bolt for a hub that couples a wheel and an axle of a vehicle, the instrument comprising: a setting portion that sets a predetermined axial force of the bolt; an initiation operation portion that is operated to start measurement; a tapping portion against which the bolt abuts, the tapping portion further comprising an impact chip that comes in contact with the bolt, the tapping portion being operated by an initiation operation of the initiation operation portion to continuously tap the bolt a plurality of times with a predetermined stroke; a sound collecting portion which is brought into contact with the bolt, and collects tap sound generated by the tapping portion tapping the bolt; a frequency measuring portion that measures a frequency of the tap sound collected by the sound collecting portion; an axial force converting portion that converts the frequency of the tap sound measured by the frequency measuring portion into an axial force of the bolt; a comparing portion that compares a set axial force set in the setting portion with a converted axial force converted in the axial force converting portion from the frequency of the tap sound; and a display portion that displays a result of a comparison performed by the comparing portion, wherein the instrument is a one-piece instrument.