Browse Prior Art Database

Self Compensation Setscrew Lock

IP.com Disclosure Number: IPCOM000052921D
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Foster, LS: AUTHOR

Abstract

When setscrews holding cams to shafts vibrate loose, it is desirable to have some technique by which the cam will not rotate relative to the shaft. The device disclosed above illustrates a cam member 10 which is encircling shaft 12. A conventional key 14 is located in keyway 16 of shaft 12. Cam 10 is threaded to accept a setscrew 18 to engage key 14. At a position roughly 90 Degrees from key 14 and setscrew 18 is a second opening 20 to admit a second setscrew 22. Setscrew 22 is threadedly engaged with the threads 24 formed into spring member 26. Spring member 26 is contained within a cavity 28 within the confines of the cam 10. As setscrew 18 is tightened, the key 14 is forced into keyway 16. This removes any cam-to-shaft clearance in the region 30.

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Self Compensation Setscrew Lock

When setscrews holding cams to shafts vibrate loose, it is desirable to have some technique by which the cam will not rotate relative to the shaft. The device disclosed above illustrates a cam member 10 which is encircling shaft 12. A conventional key 14 is located in keyway 16 of shaft 12. Cam 10 is threaded to accept a setscrew 18 to engage key 14. At a position roughly 90 Degrees from key 14 and setscrew 18 is a second opening 20 to admit a second setscrew 22. Setscrew 22 is threadedly engaged with the threads 24 formed into spring member 26. Spring member 26 is contained within a cavity 28 within the confines of the cam 10. As setscrew 18 is tightened, the key 14 is forced into keyway 16. This removes any cam-to-shaft clearance in the region 30. To insure lateral stability of shaft 12 within cam 10, setscrew 22 is threaded into spring 26 and tightened. As the setscrew is tightened, spring 26 is flexed to create a resistive force against setscrew 22 and is contained in its flexure until it engages the interior of cavity 28. Should setscrew 18 vibrate loose, the force of spring 26 acting on setscrew 22 will be sufficient to maintain the relative position of cam 10 with respect to shaft 12 or a limited period until setscrew 18 may be retightened.

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