Patent US5215187A successfully refreshed from Google Patents.
US5215187A
Expired / Lapsed
US
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Keyboard membrane keyswitch assembly
Assignee: BenQ Corp
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Filing: 1992-01-31
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Granted: 1993-06-01
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Expires: 2012-01-31
Abstract
Abstract A keyboard membrane keyswitch assembly comprises a housing, a button, a compression piston and a rubber element. The housing holds the compression piston and the rubber element. The compression piston preferably has a cylindrical shape with a vertical guider along its longitudinal axis. The vertical guider is used to connect the assembly to the button. A supporting ring is linked to the vertical guider by rib elements. The rubber element is adapted to receive the supporting element of the compression piston thereby maximizing the displacement of the button and preventing the button from tilting when it is depressed.
Inventors
- 👤 Liao Ping-Chieng
- 👤 Hsu Chien-Shih
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:33
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; H01H13/702; H01H13/705; H01H2215/00; H01H2215/004; H01H2221/00; H01H2221/024; H01H2221/026; H01H2221/058
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
325 words
A keyswitch assembly for providing maximum displacement in a substantially vertical direction without tilting, said assembly comprising: a housing adapted to be positioned on a membrane switch, said housing having a base opening and on a face opposite said base opening, a first top opening located at a central position of said face and a pair of second top openings, one on each side of said first opening; a button, said button having a connector located approximately at a central position and oriented perpendicular to said button; a compressing piston, said compressing piston further comprising: a main vertical guider having a substantially cylindrical shape and including a guiding track, said guiding track being aligned along the cylinder axis of said vertical guider for receiving the connector of said button; a supporting ring having an annular lip, said supporting ring being oriented concentrically with said main vertical guider and connected to said main vertical guider through a pair of radially directed rib elements, and further said supporting ring having a pair of guiding arms extending from said annular lip and aligned parallel to said main vertical guider; and said compressing piston being positioned between said housing and said membrane switch so that said main vertical guider and said pair of guiding arms pass through the face of said housing at said first top opening and pair of second top openings, respectively; and an elastic member adapted to be positioned inside of said housing and on said membrane switch, said elastic member defining: a bottom opening having a size intermediate between the base opening of said housing and the diameter of said support ring; and a support opening on a face of said elastic member opposite to said bottom opening, said support opening comprising a support member which is dimensioned to engage the annular lip of said supporting ring, said elastic member supplying a restoring force to said compressing piston after said piston has been vertically displaced.
Claim 2
Dependent Claim
325 words
A keyswitch assembly for providing maximum displacement in a substantially vertical direction without tilting, said assembly comprising: a housing adapted to be positioned on a membrane switch, said housing having a base opening and on a face opposite said base opening, a first top opening located at a central position of said face and a pair of second top openings, one on each side of said first opening; a button, said button having a connector located approximately at a central position and oriented perpendicular to said button; a compressing piston, said compressing piston further comprising: a main vertical guider having a substantially cylindrical shape and including a guiding track, said guiding track being aligned along the cylinder axis of said vertical guider for receiving the connector of said button; a supporting ring having an annular lip, said supporting ring being oriented concentrically with said main vertical guider and connected to said main vertical guider through a pair of radially directed rib elements, and further said supporting ring having a pair of guiding arms extending from said annular lip and aligned parallel to said main vertical guider; and said compressing piston being positioned between said housing and said membrane switch so that said main vertical guider and said pair of guiding arms pass through the face of said housing at said first top opening and pair of second top openings, respectively; and an elastic member adapted to be positioned inside of said housing and on said membrane switch, said elastic member defining: a bottom opening having a size intermediate between the base opening of said housing and the diameter of said support ring; and a support opening on a face of said elastic member opposite to said bottom opening, said support opening comprising a support member which is dimensioned to engage the annular lip of said supporting ring, said elastic member supplying a restoring force to said compressing piston after said piston has been vertically displaced.
References Cited (Backward Citations)
US4440992A
Cited
US4827243A
Cited
JPH01264125A
Cited
JPH0357114A
Cited
JPH03108218A
Cited
JPH03119620A
Cited
US5120923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-31 | 1996-11-30 | 1997-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-31 | 2000-11-30 | 2001-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-31 | 2004-11-30 | 2005-06-01 | $7700.00 | Window Closed / Lapsed |