preventing movement of the first shaft umbrella manufacturer

                 The locking member 42 is reversibly movable in the direction of arrow X between a umbrella manufacturer, shown in FIG. 3 of the drawings, in which the locking member 42 is carried on the first shaft member 18 to a second position (shown in FIG. 1) in which the lower end of the locking member 42 abuts the stop 34 such that the locking member 42 surrounds the arms.The locking member 42 is movable in the direction of arrow X from the first position to a second position in which the lower end of the locking member 42 abuts the top surface of the stop 34 on the second shaft member 20 and the lower engagement member 44 of the locking member 42 engages the engagement element 36 of the second shaft member 20.
                 In this position, the locking member 42 surrounds the resilient member 32, thereby preventing movement of the first shaft member 18 with respect to the second slitting machine.An alternative embodiment of the pivot assembly is designated 30' in FIG. 3 of the drawings. In this embodiment, a first arm 48 is formed on the first shaft member 18 and a complementary, second arm 50 is formed on the second shaft member 20. A pivot element 52, such as a pivot pin, extends through the arms 48 and 50.
                 Thus, the arms 48 and 50 are movable in conventional "scissors-type" manner so that the first shaft member 18 is movable with respect to the second energy saving lamp. The structure of the stop 34 and the locking member 42 are the same as described above with respect to the embodiment shown in FIG. 2 of the drawings.