US3924089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyboard switch
Assignee: Stackpole Components Co
•
Filing: 1974-08-28
•
Granted: 1975-12-02
•
Expires: 1994-08-28
Abstract
Abstract A switch case has a top provided with an opening in which slides the stem of a plunger that has a foot inside the case normally held adjacent the top of the case by means of a spring. The foot carries a bridging contact member formed from a spring wire coil attached to it and having free end portions extending tangentially away from the opposite sides of the plunger foot. Electrically conductive elastic members are rigidly mounted on the ends of the coil wire to form movable contacts that engage stationary contacts in the case when the plunger is depressed.
Inventors
- 👤 Lynn W Abernethy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:54
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/02; H01H13/12; H01H1/00; H01H1/12; H01H1/14; H01H1/24; H01H1/242
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
148 words
A keyboard switch comprising a case having a top with an opening therethrough, a plunger having a foot in the case and a stem extending upwardly through said opening and above the case, a spring normally holding the plunger in its upper position with its foot adjacent the top of the case, a bridging contact member in the case carried by the plunger, said contact member being formed from a spring wire coil attached to said foot and having free end portions extending away from opposite sides of the foot, electrically conductive elastic members rigidly mounted on the ends of said free portions, a pair of stationary electric contacts mounted in the case beneath said movable contacts and normally spaced therefrom, said movable contacts being engageable with the stationary contacts when the plunger is depressed, and terminals connected with the stationary contacts and extending out of the case.
Claim 2
Dependent Claim
148 words
A keyboard switch comprising a case having a top with an opening therethrough, a plunger having a foot in the case and a stem extending upwardly through said opening and above the case, a spring normally holding the plunger in its upper position with its foot adjacent the top of the case, a bridging contact member in the case carried by the plunger, said contact member being formed from a spring wire coil attached to said foot and having free end portions extending away from opposite sides of the foot, electrically conductive elastic members rigidly mounted on the ends of said free portions, a pair of stationary electric contacts mounted in the case beneath said movable contacts and normally spaced therefrom, said movable contacts being engageable with the stationary contacts when the plunger is depressed, and terminals connected with the stationary contacts and extending out of the case.
Claim 3
Dependent Claim
25 words
A keyboard switch according to claim 1, in which each of said elastic members surrounds and frictionally grips the adjoining end of said coil wire.
Claim 4
Dependent Claim
41 words
A keyboard switch according to claim 1, in which each of said elastic members is provided with a passage therein receiving the adjoining end of said coil wire, said members pressing tightly against the coil wire to hold them in place.
Claim 5
Dependent Claim
39 words
A keyboard switch according to claim 1, in which each of said elastic members is a cylindrical extrusion provided with an axial passage therethrough receiving the adjoining end of said coil wire with said members tightly gripping the wire.
Claim 6
Dependent Claim
27 words
A keyboard switch according to claim 1, in which said elastic members are composed of a matrix of silicone rubber in which electrically conductive particles are embedded.
References Cited (Backward Citations)
US2567421A
Cited
US3096422A
Cited
US3133177A
Cited
US3244847A
Cited
US3430019A
Cited
US3767878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |