Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Friction Driven Switch Actuator Caps

IP.com Disclosure Number: IPCOM000102893D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Gallagher, RM: AUTHOR [+2]

Abstract

Some people with disabilities can operate a computer with a stick that is held in the mouth or attached to the head. The keys to operate the computer terminal and keyboard can be adapted to make this operation easier.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 73% of the total text.

Friction Driven Switch Actuator Caps

      Some people with disabilities can operate a computer with a
stick that is held in the mouth or attached to the head. The keys to
operate the computer terminal and keyboard can be adapted to make
this operation easier.

      This concept proposes to add a friction component to all the
switches on such products that are pushbuttons, rockers or sliding
switches so that they will be receptive to the use of head and mouth
sticks.  The addition of a three-sided lip or raised edge would also
provide additional protection against possible slippage during
actuation of the switch.  The friction component can be accomplished
in several ways.  One way is by using a double-shot molding
technique, as shown in the figure.  The keycap is made of two
materials molded together.  One of the materials is of high durometer
to give the keycap rigidity where it attaches to the switch
mechanism.  This rigidity is necessary for strength to retain the
shaft of the switch actuator.  The top portion of the switch would be
molded in a low durometer material.  This would allow the cap to have
a friction surface with tactile feel.  There are a number of low
durometer polymers, such as low durometer polyurethanes (Monsanto
"Santoprene"), or thermoplastic elastomers that could be processed in
this manner.

      A second method of fabricating this type of cap would be to
make it of two plastic parts that snap together.  In this way, one
coul...