Integral mechanical lock

An integral mechanical lock for securing extensible and pivotal two member tools, comprising a first member having at least one notch and a second member having an integral lock that engages the first member notch locking the first member and second member in position. The integral lock includes a locking bar integrally formed with a support arm that is located between a pressure pad end and a locking end portion, the support arm provides an effective pivot point whereby when force is applied to the pressure pad end, the locking end portion is urged up out of the first member notch releasing the engagement between the first member from the second member. The integral lock may be constructed from a single flat sheet of metal, or further formed with bends or inclusion of other fixated pieces. A safety interlock shim feature works cooperatively with the pressure pad end by preventing the locking end portion from being urged from the notch when the safety interlock shim is located under the pressure pad end.