Universal joint
A universal joint is provided with a rotation shaft having a ball portion provided at an end thereof and a pair of projections formed on a diameter line of the ball portion, and a rotation body having guide grooves formed for receiving insertion of the respective projections of the rotation shaft and a holding hole formed for holding the ball portion, the ball portion being rotatable about an axis line of the projections and rotatable while inclining the projections along the guide grooves. In the universal joint pins serving as a stopper are provided in the holding hole for inhibiting the ball portion from slipping off.
1. A universal joint comprising:
a rotation shaft having a ball portion provided at an end of the rotation shaft and a pair of projections formed on a diameter line of the ball portion, and
a rotation body having guide grooves formed for receiving insertion of the respective projections of the rotation shaft and a holding hole formed for holding the ball portion, the ball portion being rotatable about an axis line of the projections and rotatable while inclining the projections along the guide grooves,
wherein the rotation body has a pair of through holes formed therein to cross the holding hole, and a pair of pins are respectively inserted into the pair of through-holes and are respectively placed on two sides of the rotation shaft connected to the ball portion mounted in the holding hole, so that the pair of pins prevent misalignment of a rotation center when the ball portion rotates about the axis line of the projections.
2. The universal joint according to claim 1 , wherein an opening end of the holding hole is positioned close to the pair of pins.