Slotted Drive Nut
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
When a half or full nut must engage onto a revolving lead screw, non-alignment between the screw and nut is prevalent. Non-alignment causes the nut threads to deteriorate rapidly. Disclosed herein is a drive nut, the first pitch root thread of which is slotted to thereby create a flexure at the front of the nut. The nut then can accommodate misalignment without thread deterioration. Referring to Fig. 1, a half nut is mounted on a carrier 2 to engage lead screw 3 and permit the carrier to controllable scan in the horizontal direction. Referring to Fig. 2A, the improved half nut 1 includes a slot in the first pitch root thread. The flexure acts as a shock absorber, and also absorbs premature (Fig. 2B) and delayed (Fig. 2C) misalignments without deterioration of the nut.