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Shunt Bar Actuator for a Reed Switch Transmit Device

IP.com Disclosure Number: IPCOM000091750D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Branham, CE: AUTHOR [+3]

Abstract

Data is electrically encoded by switch operators 10. The latter are selectively moved by bails 11 coming from an ancillary device such as a keyboard not shown. Each actuator 10 operates against the free end of a buckling column 12 to which is attached shunt plate 13 having a window opening 14. Encapsulated reed switch 15 is mounted under column 12 and is controlled by permanent magnet 16 positioned directly above. Magnet 16 fits within window 14. Its flux is normally intercepted by shunt 13 to prevent influence of reed switch 15. Upon displacement of actuator 10, column 12 buckles to the broken line position shown, rapidly removing shunt 13 from around magnet 16 and permitting such magnet to transfer reed switch 15.

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Shunt Bar Actuator for a Reed Switch Transmit Device

Data is electrically encoded by switch operators 10. The latter are selectively moved by bails 11 coming from an ancillary device such as a keyboard not shown. Each actuator 10 operates against the free end of a buckling column 12 to which is attached shunt plate 13 having a window opening
14. Encapsulated reed switch 15 is mounted under column 12 and is controlled by permanent magnet 16 positioned directly above. Magnet 16 fits within window
14. Its flux is normally intercepted by shunt 13 to prevent influence of reed switch 15. Upon displacement of actuator 10, column 12 buckles to the broken line position shown, rapidly removing shunt 13 from around magnet 16 and permitting such magnet to transfer reed switch 15. The configuration of windowed shunt 13 makes the force of attraction between magnet 16 and shunt 13 a minimum in the rest position. As the shunt 13 is raised, the force increases to some maximum value and then decreases again. This allows the column 12 to buckle under the minimum magnetic force.

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