US5203448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Push button key switch
Assignee: Lite On Singapore Pte Ltd
•
Filing: 1992-02-11
•
Granted: 1993-04-20
•
Expires: 2012-02-11
Abstract
Abstract A push button key switch has an intermediate guide cylinder which is free to slide lengthwise inside a fixed guide cylinder and which at the same time holds the neck of a keytop while allowing it to slide freely lengthwise. The intermediate guide cylinder guides the keytop in its motion while the fixed guide cylinder guides the intermediate guide cylinder in its motion. Downward motion of the keytop causes the lower ends of the neck and the intermediate guide cylinder to collapse an elastic member which, in turn, then activates an electrical contact mechanism.
Inventors
- 👤 Masamitsu Osada
- 👤 Nobuyuki Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:31
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/02; H; H01; H01H; H01H13/00; H01H13/70; H01H13/702; H01H13/705; H01H2215/00; H01H2215/002; H01H2215/004; H01H2215/006; H01H2221/00; H01H2221/024; H01H2221/026; H01H2221/028; H01H2221/05; H01H2227/00; H01H2227/036; H01H2233/00; H01H2233/05; H01H2233/054; H01H2233/056
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
A push button key switch comprising: a base having a fixed guide cylinder formed therein; an intermediate guide cylinder slidable lengthwise inside said fixed guide cylinder; a keytop having a neck extending therefrom, said neck being slidable lengthwise inside said intermediate guide cylinder, said keytop and said neck having a prescribed keystroke distance; an elastic body positioned below and contacting one end of said neck whereby said elastic body normally biases said keytop and said neck to an uppermost position; and an electric contact mechanism positioned below said elastic body whereby when said keytop is pushed downwardly said prescribed keystroke distance, said one end of said neck and an end of said intermediate guide cylinder contact said elastic body to cause said elastic body to collapse and contact said electric contact mechanism to thereby activate said electric contact mechanism.
Claim 2
Dependent Claim
139 words
A push button key switch comprising: a base having a fixed guide cylinder formed therein; an intermediate guide cylinder slidable lengthwise inside said fixed guide cylinder; a keytop having a neck extending therefrom, said neck being slidable lengthwise inside said intermediate guide cylinder, said keytop and said neck having a prescribed keystroke distance; an elastic body positioned below and contacting one end of said neck whereby said elastic body normally biases said keytop and said neck to an uppermost position; and an electric contact mechanism positioned below said elastic body whereby when said keytop is pushed downwardly said prescribed keystroke distance, said one end of said neck and an end of said intermediate guide cylinder contact said elastic body to cause said elastic body to collapse and contact said electric contact mechanism to thereby activate said electric contact mechanism.
Claim 3
Dependent Claim
48 words
The push button key switch according to claim 1, wherein the total of the distance of relative motion between said fixed guide cylinder and said intermediate guide cylinder and that between said intermediate guide cylinder and said keytop is greater than said prescribed keystroke distance for the keytop.
Claim 4
Dependent Claim
18 words
The push button key switch according to claim 1, wherein said elastic body is a cup-shaped rubber spring.
Claim 5
Dependent Claim
33 words
The push button key switch according to claim 3, wherein said rubber spring includes an activator node which contacts and activates the contact mechanism when said rubber spring is in a collapsed position.
Claim 6
Dependent Claim
37 words
The push button key switch according to claim 3, wherein said electric contact mechanism remains activated while said rubber switch is in a collapsed position and becomes deactivated when said rubber switch returns to its normal position.
References Cited (Backward Citations)
US4527030A
Cited
EP0091284A2
Cited
EP0100936A2
Cited
US4454562A
Cited
US4918271A
Cited
DE3414909A1
Cited
US4755645A
Cited
US4720609A
Cited
JPS645815A
Cited
JPS648218A
Cited
JPS6419620A
Cited
JPS6455013A
Cited
US4927990A
Cited
JPH0357114A
Cited
JPH03108218A
Cited
JPH03194811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-19 | 1996-10-19 | 1997-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-19 | 2000-10-19 | 2001-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-19 | 2004-10-19 | 2005-04-20 | $7700.00 | Window Closed / Lapsed |