Patent ID: 7121951

Claim:
A connecting shaft device comprising: a connecting shaft including a fixed connecting part on one end, and a connecting part on the other end for connecting to a socket, and including an axial hole formed in said connecting part, and including two ball holes formed in two sides of said connecting part respectively and communicating with said axial hole thereof, said connecting shaft including a groove hole formed therein and communicating with said axial hole thereof, two positioning steel balls engaged in said ball holes of said connecting shaft respectively, an axial rod slidably engaged into said axial hole of said connecting shaft, and including a first concave groove and a second concave groove formed in one end thereof in corresponding to said ball holes of said connecting shaft respectively, and said axial rod including a pivotal hole formed therein, a sliding control element being a socket body slidably engaged onto said connecting shaft and connected to said axial rod for moving said axial rod to slide relative to said connecting shaft, and to move said first and said second concave grooves to control said positioning steel balls either to fix the socket to said connecting shaft or to allow the socket to be pivoted relative to said connecting shaft, said sliding control element including a first positioning circular groove, a second positioning circular groove and a third positioning circular groove formed therein, and including a pivotal hole formed therein, a positioning pivotal element engaged into said groove hole of said connecting shaft and engaged into said pivotal holes of said sliding control element and said axial rod to connect said sliding control element to said axial rod, and a positioning rubber engaged on said connecting shaft for selectively engaging with either of said first or said second or said third positioning circular groove of said sliding control element.