64 about which the locking member 80 pivots through receipt of the pin 82 through a bore 84 provided in the locking member 80 a coil spring 86 is also provided in the recess portion 81 of the handle 12 adjacent the blade cavity for contacting and bearing against one side of the blade lock 80 thereby biasing the blade lock 80 into the blade cavity 64 thus when the knife blade 54 is moved to an extended position the free end 90 of the blade lock 80 will be urged into the blade cavity under the force of the spring 86 the free end 90 of the blade lock consequentially bears against the end 92 of the knife blade 54 to prevent the knife blade from being moved to its retracted position without the user first depressing the locking member 80 against the force of the spring 86 against the wall of the handle adjacent the knife cavity by so doing the free end 90 of the locking member will no longer contact the end of the blade 54 and the blade may be freely moved from its extended position to its retracted position from the foregoing it is seen that the tool of the present.