Browse Prior Art Database

Magnet Spring System

IP.com Disclosure Number: IPCOM000091795D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Killam, DG: AUTHOR

Abstract

The combination of a low-force spring, acting throughout the range of armature movement, and a preloaded higher force low-rate spring, acting only during the last fraction of armature movement, provides for a fast pickup and dropout magnet system. In drawing A, when magnet coil 11 is de-energized, armature 10 pivots clockwise about shaft 12 to a position where arm 13 comes against stop 14 as indicated by the dashed line. Arm 13 is attached to armature 10 by screw 15. Low-force extension spring 16 is attached at one end to upper stop 17 and at its other end to offset extension 18, integral with 13. Spring 16 is a low-rate spring and offers little resistance to movement of armature 10 when magnet 11 is energized. Wire flexure spring 19 is preloaded on 13 as in drawing B.

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Magnet Spring System

The combination of a low-force spring, acting throughout the range of armature movement, and a preloaded higher force low-rate spring, acting only during the last fraction of armature movement, provides for a fast pickup and dropout magnet system. In drawing A, when magnet coil 11 is de-energized, armature 10 pivots clockwise about shaft 12 to a position where arm 13 comes against stop 14 as indicated by the dashed line. Arm 13 is attached to armature 10 by screw 15. Low-force extension spring 16 is attached at one end to upper stop 17 and at its other end to offset extension 18, integral with 13. Spring 16 is a low-rate spring and offers little resistance to movement of armature 10 when magnet 11 is energized. Wire flexure spring 19 is preloaded on 13 as in drawing
B. Spring 19 is a low-rate spring with a high-preload force. With this spring system, armature 10 rotates counterclockwise very rapidly and with little opposition when magnet 11 is energized. As armature 10 approaches pole piece 20, spring 19 engages stop 17 and as 10 continues to move, the preload force is transferred to armature 10. The transferred preload force together with the force of spring 16 causes armature 10 to move quickly in a clockwise direction away from stop 17 when 11 is de-energized.

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