Canadian Patents Database / Patent 2186789 Summary
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|(12) Patent:||(11) CA 2186789|
|(54) English Title:||ERGONOMIC COMPUTER KEYBOARD (AND KEY)|
|(54) French Title:||CLAVIER ET TOUCHES ERGONOMIQUES|
|(51) International Patent Classification (IPC):||
|(72) Inventors (Country):||
|(73) Owners (Country):||
|(71) Applicants (Country):||
|(22) Filed Date:||1996-09-30|
|(41) Open to Public Inspection:||1998-03-31|
|(30) Availability of licence:||N/A|
|(30) Language of filing:||English|
A computer keyboard having membrane switches activated by finger touch keys
supported by an upper resilient layer of the membrane circuit board. The keys
a rigid projection fixedly secured to the finger touch part of the key. The
depressable against the resiliency of the upper layer to make circuit contact.
key is guided during movement and has a short travel distance as well as very
touch for circuit activation. The keyboard addresses the problem of keyboard
related repetitive strain injuries (RSI's) and other disabilities requiring a
touch" in a computer keyboard.
1. A computer keyboard comprising:
(a) a membrane circuit board having a resilient upper switch circuit layer, a
lower switch circuit layer and an insulative layer disposed therebetween,
through said insulative layer aligned with predetermined circuit paths on said
upper and lower switch circuit layers for completing predetermined circuits by
physical contact of conductive material on one of said layers with conductive
material on the other of said upper and lower layers;
(b) a push button key for each of respective ones of said holes, each said
button key having a downwardly extending rigid projection fixed thereto and
aligned with the hole associated therewith, each said key, in a key at rest
open position being supported by said upper resilient layer, said keys being
movable from their at rest position in a direction toward said lower layer
to cause physical contact of the conductive material on said respective upper
lower layers; and
(c) means, on said key board, resisting movement of said keys, from their at
position, in a direction away from said upper layer.
2. A computer keyboard as defined in claim 1 including means guiding said keys
during movement of the same.
3. A computer keyboard as defined in claim 2 wherein said movement resisting
guide means includes a socket for each of respective ones of said keys.
4. A computer keyboard as defined in claims 1, 2 or 3 wherein each said push
key has a plate portion with said rigid projection extending downwardly from a
central portion of an underside portion of said plate portion, a further
extending downwardly from said plate portion at a position spaced outwardly
said rigid projection, said further projection having an outwardly directed
engagement with an abutment means and thereby provide said means resisting
movement of said keys in a direction away said upper layer.
5. A keyboard as defined in claim 2 wherein said guide and movement resisting
include a socket member having an annular space surrounding a post means, a
flange projecting inwardly into said annular space, said further projection
located in said annular space such that the outwardly directed hook thereon is
engagable with said flange and thereby prevent the key from being dislodged
from said socket.
6. A computer keyboard comprising:
(a) a lower circuit sheet means comprising a first sheet of insulating
a first electrically conductive means thereon;
(b) an upper circuit sheet means overlying said lower sheet means and
comprising a second resilient sheet of insulating material with a second
electrically conductive means on a surface thereof facing said first
(c) spacer means disposed between said first and second circuit sheet means;
said spacer means having a plurality of openings therein permitting physically
moving preselected portions of said second electrically conductive means into
contact with said fast electrically conductive means for selectively
completing predetermined circuits;
(d) a push button key for each of respective ones of said plurality of
said push button key having a downwardly extending rigid projection fixed
and aligned with the opening associated therewith, each said key having the
rigid projection thereof in physical contact with said upper resilient sheet,
said key being supported by said resilient sheet in an at rest open circuit
and being movable from said rest position in a direction toward said lower
thereby to cause said physical contact of the conductive material on said
respective upper and lower sheets; and
(e) means, on said key board, resisting movement of said keys, from their at
position, in a direction away from said upper sheet.
7. A computer keyboard as defined in claim 1 including a layer of compressible
elastomeric material on said upper circuit layer, said elastomeric material
having a predetermined compressibility value.
8. A computer keyboard as defined in claim 7 including a thin protective layer
disposed between said rigid downward projection on said push button key and
the elastomeric material.
9. A computer keyboard as defined in claim 8 wherein the compressibility of
elastomeric material is such that a force of approximately 50 grams on the
push button key is required to active a circuit.
For a clearer understanding of the status of the application/patent presented on this page, the site Disclaimer , as well as the definitions for Patent , Administrative Status , Maintenance Fee and Payment History should be consulted.
|(41) Open to Public Inspection||1998-03-31|
|Fee Type||Anniversary Year||Due Date||Amount Paid||Paid Date|
|Maintenance Fee - Application - New Act||2||1998-09-30||$50.00||1998-09-24|
|Maintenance Fee - Application - New Act||3||1999-09-30||$50.00||1999-09-24|
|Maintenance Fee - Application - New Act||4||2000-10-02||$50.00||2000-09-26|
|Maintenance Fee - Application - New Act||5||2001-10-01||$75.00||2001-09-10|
|Maintenance Fee - Application - New Act||6||2002-09-30||$75.00||2002-09-27|
|Maintenance Fee - Application - New Act||7||2003-09-30||$75.00||2003-07-16|
|Request for Examination||$200.00||2003-07-18|
|Reinstatement: Failure to Pay Application Maintenance Fees||$200.00||2004-10-14|
|Maintenance Fee - Application - New Act||8||2004-09-30||$100.00||2004-10-14|
|Maintenance Fee - Application - New Act||9||2005-09-30||$100.00||2005-08-01|
|Maintenance Fee - Patent - New Act||10||2006-10-02||$125.00||2006-09-18|
|Maintenance Fee - Patent - New Act||11||2007-10-01||$125.00||2007-09-14|
|Maintenance Fee - Patent - New Act||12||2008-09-30||$125.00||2008-09-04|