US Patent 8973472 Tool extension bar

A tool extension bar includes a rod including first and second ends. The second end is adapted to connect to and be driven by a power tool. A sleeve assembly is slidably mounted around the rod and includes an end adapted for connecting to a tool member. A radial hole extends in a radial direction at an end of the sleeve assembly. An elastic member is mounted around the second end of the rod and is biased against the rod and the sleeve assembly. An engaging member is movably received in the radial hole and is moveably engaged in the recess of the rod. The engaging member releasably engages the sleeve with the rod.