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Spherical Inversion Actuator Button for Long Stroke Applications

IP.com Disclosure Number: IPCOM000110690D
Original Publication Date: 1992-Dec-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Koprowski, SE: AUTHOR [+2]

Abstract

This article describes a design solution for one-finger actuation of circuit-board mounted or electromechanical types of switches, where distance between switch and actuator must be variable and allowable, therefore requiring a long-stroke, self-restoring actuator.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 69% of the total text.

Spherical Inversion Actuator Button for Long Stroke Applications

       This article describes a design solution for one-finger
actuation of circuit-board mounted or electromechanical types of
switches, where distance between switch and actuator must be variable
and allowable, therefore requiring a long-stroke, self-restoring
actuator.

      The figure depicts a design featuring one-piece molded actuator
button constructed of molded elastomeric material which is the
preferred configuration.

      The button is used to actuate a snap-action dome switch on the
face of a circuit board.  This actuator button is designed to enhance
tactile feedback to the operator's finger for confirmation as to
exactly when actuation of the domed switch actually occurs.

      The actuator button includes integral retention lip 1, located
on cylindrical guide sleeve 2 and centralized super-extendable
actuation core 3 which actuates the switch (not shown), the core
being sideways-supported by centering webs 4.

      Actuator button has a convex dome 5 which inverts under finger
pressure to a concave shape while retaining sufficient restoring
torque to prevent remaining detented in the inverted state.

      When the actuating finger is removed, restoring torque is
uniquely applied to the inverted dome by way of its attachment to
hollow cylindrical guide sleeve 2.  The cylindrical guide sleeve 2
swells and rolls radially where it joins the inverting dome 5
providing...