US4376238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical devices
Assignee: Fujitsu Services Ltd
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Filing: 1981-03-11
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Granted: 1983-03-08
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Expires: 2001-03-11
Abstract
Abstract A membrane switch assembly in which portions of a membrane 14 mounted on a base member 11 are belled-outwardly to provide cavities 15, which are positioned so as to overly the location at which conductors 21, 22 are to be connected. The formation of each belled out portion is such that each portion carries electrical contactor means 16, 20 and such that the portion has a circumscribing region 18 which on compression of the portion to cause switch operation allows the membrane 14 to collapse at this region before the membrane is fully compressed.
Inventors
- 👤 Sidney H. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:17
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/50; H01H13/64; H01H13/02; H01H13/04; H01H13/06; H01H2215/00; H01H2215/004; H01H2225/00; H01H2225/018
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
181 words
A switch assembly including a base member, at least one pair of conductors provided upon the base member and which are to be electrically connected, an elastomeric membrane extending over the base member, the membrane having at least one portion belled outwardly away from the base member to define a cavity beneath the membrane and being so positioned as to overly at least two separate pairs of conductors to be electrically connected, each said belled out portion of the membrane having a circumscribing region of such characteristics that on exerting pressure on the portion to collapse said portion towards the base member, said circumscribing region is first to collapse, each said portion also including first and second conductive contactor elements positioned as to be electrically connectable with the first and second pairs of the electrical conductor pairs and so located relative to the circumscribing region that on exerting pressure upon the membrane to collapse said portion towards the base member, said first and second conductive contactor contact elements are caused successively to contact the associated first and second pairs of conductors.
Claim 2
Dependent Claim
181 words
A switch assembly including a base member, at least one pair of conductors provided upon the base member and which are to be electrically connected, an elastomeric membrane extending over the base member, the membrane having at least one portion belled outwardly away from the base member to define a cavity beneath the membrane and being so positioned as to overly at least two separate pairs of conductors to be electrically connected, each said belled out portion of the membrane having a circumscribing region of such characteristics that on exerting pressure on the portion to collapse said portion towards the base member, said circumscribing region is first to collapse, each said portion also including first and second conductive contactor elements positioned as to be electrically connectable with the first and second pairs of the electrical conductor pairs and so located relative to the circumscribing region that on exerting pressure upon the membrane to collapse said portion towards the base member, said first and second conductive contactor contact elements are caused successively to contact the associated first and second pairs of conductors.
Claim 3
Dependent Claim
18 words
A switch assembly as claimed in claim 1 in which the first conductive contact comprises a ring-like member.
References Cited (Backward Citations)
US3898421A
Cited
GB1441765A
Cited
US3917917A
Cited
FR2284177A1
Cited
US3996429A
Cited
US4084071A
Cited
GB2054268A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-07 | 1986-09-06 | 1987-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-07 | 1990-09-06 | 1991-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-07 | 1994-09-06 | 1995-03-08 | $7700.00 | Window Closed / Lapsed |