US4412113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust venting contact with a non-circular hole
Assignee: Panasonic Holdings Corp
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Filing: 1982-08-04
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Granted: 1983-10-25
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Expires: 2002-08-04
Abstract
Abstract In a push-on switch comprising a moving contact 6 of partial-hemisphere-face-shaped resilient metal diaphragm which is disposed with its periphery on a pair of peripheral fixed contacts 2b,2b in a contacting manner and at its central part apart above a central fixed contact 2a in an isolated manner at normal state, the improvement is made such that the metal diaphragm moving contact 6 has an opening 6a having at least a protrusion 6b with respect to the opening 6a; so that the opening 6a allows air to pass at inversing and restoring motions of the central principal part of the moving contact 6, thereby preventing drafting of dust onto the central fixed contact 2a, and that the protrusion 6b slides on and cleans the surface of the central fixed contact 2a at each pushing down of the central part of the moving contact 6.
Inventors
- 👤 Itaru Mitsugi
- 👤 Shunzo Oka
- 👤 Yoshinobu Nakagawa
- 👤 Kenichi Shiho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:16
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/02; H01H13/26; H01H13/48; H01H2227/00; H01H2227/026; H01H2227/0261
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
A switch comprising: a case having a recessed space therein; a central fixed contact disposed at the center of the bottom face of said recessed space; at least one peripheral fixed contact fixedly disposed at a peripheral part of the bottom face of said recessed shape; a movable contact of resilient metal which is partially hemispherically shaped with a central portion movable between a normal state where said resilient metal is unflexed and no force is applied thereto and a strained state where said central portion is pushed down; an actuation member having a pushing part movable in engagement with said central portion of said moving contact; the improvement comprising said central portion of said moving contact having an opening, said opening having a peripheral edge at least a portion of which projects into said opening whereby said opening is non-circular.
Claim 2
Dependent Claim
141 words
A switch comprising: a case having a recessed space therein; a central fixed contact disposed at the center of the bottom face of said recessed space; at least one peripheral fixed contact fixedly disposed at a peripheral part of the bottom face of said recessed shape; a movable contact of resilient metal which is partially hemispherically shaped with a central portion movable between a normal state where said resilient metal is unflexed and no force is applied thereto and a strained state where said central portion is pushed down; an actuation member having a pushing part movable in engagement with said central portion of said moving contact; the improvement comprising said central portion of said moving contact having an opening, said opening having a peripheral edge at least a portion of which projects into said opening whereby said opening is non-circular.
Claim 3
Dependent Claim
32 words
A switch in accordance with claim 1 wherein said actuation member has a pushing part which is formed under said actuator and has at least an opening on the bottom face thereof.
Claim 4
Dependent Claim
19 words
The switch as claimed in claim 1 wherein said pushing part is in the form of an interrupted ring.
Claim 5
Dependent Claim
18 words
A switch in accordance with claim 1, wherein said opening is shaped into a cross having rounded ends.
Claim 6
Dependent Claim
25 words
A switch in accordance with claim 1, wherein inner diameter of said opening of said actuator is larger than said opening on said moving contact.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |