Browse Prior Art Database

Backlash Free Differential Screw Drive

IP.com Disclosure Number: IPCOM000089744D
Original Publication Date: 1977-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Frosch, A: AUTHOR [+2]

Abstract

In this differential screw drive both screw threads, after having reached their setting position, are fixed free from backlash by a single adjusting element and without altering the position of the element to be set.

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Backlash Free Differential Screw Drive

In this differential screw drive both screw threads, after having reached their setting position, are fixed free from backlash by a single adjusting element and without altering the position of the element to be set.

In housing 1, designed as a threaded nut, there is threaded spindle 2 turnable by button 3. Inside threaded spindle 2 there is a boring containing threaded part 4a of output rod 4. Stud bolt 5 protrudes into axial nut 6 of rod 4 and secures it against rotation. The threading in part 4a has the same direction and is of a slightly smaller pitch than threaded spindle 2 so that, upon the operation of button 3, the pitch difference of the two threads determines the axial movement of rod 4.

Housing 1 shows slot 1a, and threaded spindle 2 shows four slots 2a distributed over its circumference. In housing 1a screw 7 is provided transversally to slot 1a. By the tightening of screw 7 the backlash, due to slots 1a and 2a, in the thread between housing 1 and threaded spindle 2, as well as between threaded spindle 2 and part 4a of rod 4, is reduced and finally eliminated altogether.

Housing 1, threaded spindle 2 and corresponding slots 1a and 2a are dimensioned in such a manner that the external forces generated by the tightening of screw 7 are simultaneously transferred via slotted threaded spindle 2 to the second pair of threads, too, so that in both pairs of threads the backlash is reduced and finally eliminated.

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