Patent ID: 7140277

Claim:
An extension rod assembly comprising: an elongate rod having a polygonal recess defined in a first end thereof and a polygonal connection end on a second end of the rod, an inclined passage defined in the rod and a receiving hole defined in one of sides of the polygonal connection end, an axial recess defined in the second end of the rod and communicating with the inclined passage and the receiving hole, a bead partially received in the receiving hole; a spring received in the axial recess and a first end of the spring fixed in the axial recess and a second end of the spring connected to an end of a pull pin which is received in the axial recess, the pull pin having an engaging notch and a receiving recess defined in an outer periphery thereof, the engaging notch including two stepped insides; a collar movably mounted to the rod and having an inclined hole defined in an inner periphery of the collar, and a connection pin having a first end inserted in the inclined passage and the first end of the connection pin having a protrusion which is securely engaged with the engaging notch, a second end of the connection pin extending trough the inclined passage and inserted in the inclined hole of the collar, the pull pin being pulled toward the second end of the rod and the bead dropping in the receiving recess by moving the collar together with the connection pin.