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Spring Tension Indicator

IP.com Disclosure Number: IPCOM000091108D
Original Publication Date: 1969-Oct-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Maliwacki, J: AUTHOR

Abstract

This arrangement provides for adjusting the tension in a belt passing over an idler pulley without the necessity of resorting to spring scales or other force-measuring devices. Belt 3 passes around pulley 5 mounted on one end of idler arm 7 which can rotate about pivot 9. Belt 3 is kept under tension by force exerted by coil tension spring 11. One end of spring 11 is attached to arm 7 and its other end is attached to a portion of slotted movable bracket 13. The position of bracket 13 can be adjusted by loosening screw 15 and moving such as permitted by slot 17. Extension 19 of bracket 13 extends toward and past arm 7 and is provided with a notch or other index 21.

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Spring Tension Indicator

This arrangement provides for adjusting the tension in a belt passing over an idler pulley without the necessity of resorting to spring scales or other force- measuring devices. Belt 3 passes around pulley 5 mounted on one end of idler arm 7 which can rotate about pivot 9. Belt 3 is kept under tension by force exerted by coil tension spring 11. One end of spring 11 is attached to arm 7 and its other end is attached to a portion of slotted movable bracket 13. The position of bracket 13 can be adjusted by loosening screw 15 and moving such as permitted by slot 17. Extension 19 of bracket 13 extends toward and past arm 7 and is provided with a notch or other index 21. In use, spring 11, which has a known and constant spring rate, is placed under tension by loosening screw 15 and sliding bracket 13 until indicating notch 19 lines up with one edge or face of idler arm 7. The amount of extension of spring 11 is constant with variations of the length of belt 3 as long as the index is matched up with the edge of arm 7. Since the spring rate is constant and reproducible to the required accuracy, replacement of a broken spring causes no difficulty.

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