Patent US4180715A successfully refreshed from Google Patents.
US4180715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vital movable electricl contact arrangement
Assignee: Trane US Inc
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Filing: 1978-05-05
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Granted: 1979-12-25
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Expires: 1998-05-05
Abstract
Abstract A fail-safe multiple transfer contact assembly including a plurality of front, back and heel contact elements. The contact elements include elongated leaf spring members which are fixed to a molded insulative contact block. A silver contact button is rivoted to the free ends of the front and back leaf spring members while a silver impregnated carbon contact block is soldered to the free end of the heel leaf spring member so that neither the front and back contacts cannot become welded to the heel contact.
Inventors
- 👤 William J. Lichtenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:49
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/12; H01H1/14; H01H1/24; H01H1/26; H01H1/28; H01H1/02; H01H1/021; H01H1/027; H01H1/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
64 words
A movable electrical contact comprising, an elongated leaf spring member, said elongated leaf spring member having a terminal portion formed on one end and having a bifurcated portion formed on the other end, a metallic carbon contact member, said contact member having an elongated slot located on each side for accommodating said bifurcated portion, and said contact member being fused to said bifurcated portion.
Claim 2
Dependent Claim
64 words
A movable electrical contact comprising, an elongated leaf spring member, said elongated leaf spring member having a terminal portion formed on one end and having a bifurcated portion formed on the other end, a metallic carbon contact member, said contact member having an elongated slot located on each side for accommodating said bifurcated portion, and said contact member being fused to said bifurcated portion.
Claim 3
Dependent Claim
22 words
The movable electrical contact as defined in claim 1, wherein said contact member being a cube-like piece of silver impregnated carbon material.
Claim 4
Dependent Claim
23 words
The movable electrical contact as defined in claim 1, wherein said contact member includes an upper surface for engagingly contacting a back contact.
Claim 5
Dependent Claim
33 words
The movable electrical contact as defined in claim 1, wherein said terminal portion formed on one end of said elongated leaf spring member is bent back over to form a rigid plug-in terminal.
Claim 6
Dependent Claim
46 words
The movable electrical contact as defined in claim 1, wherein said contact member includes an undercut formed on each side of said slots so that said contact member can be soldered to said bifurcated portions formed on the other end of said elongated leaf spring member.
Claim 7
Dependent Claim
23 words
The movable electrical contact as defined in claim 1, wherein an insulative actuator moves said elongated leaf spring member between two extreme positions.
Claim 8
Dependent Claim
42 words
The movable electrical contact as defined in claim 1, wherein the slotted sides of said contact member is silver plated to assist in soldering said contact member so said bifurcated portions formed on the other end of said elongated leaf spring member.
Claim 9
Dependent Claim
27 words
The movable electrical contact as defined in claim 1, wherein said terminal portion of said elongated leaf spring member is fixedly secured in a molded terminal block.
Claim 10
Dependent Claim
33 words
The movable electrical contact as defined in claim 1, wherein said contact member is a silver impregnated carbon body having a flat surface for engaging a silver point of a front contact member.
Claim 11
Dependent Claim
33 words
The movable electrical contact as defined in claim 1, wherein said contact member is a silver impregnated carbon body having a flat surface for engaging a silver point of a back contact member.
Claim 12
Dependent Claim
114 words
A fail-safe transfer switching assembly comprising, a plurality of movable heel and stationary front and back leaf spring contact members, a molded insulative contact block for retaining said leaf spring contact members in spaced relationship with each other, a plug-in terminal portion formed on one end of each of said leaf spring contact members, a silver contact button rivoted to the other end of each of said front and back leaf spring contact members, a silver impregnated carbon contact block soldered to a bifurcation formed on the other end of said movable heel leaf spring contact member for preventing welding of said silver contact buttons of said front anb back leaf spring contact members.
Claim 13
Dependent Claim
114 words
A fail-safe transfer switching assembly comprising, a plurality of movable heel and stationary front and back leaf spring contact members, a molded insulative contact block for retaining said leaf spring contact members in spaced relationship with each other, a plug-in terminal portion formed on one end of each of said leaf spring contact members, a silver contact button rivoted to the other end of each of said front and back leaf spring contact members, a silver impregnated carbon contact block soldered to a bifurcation formed on the other end of said movable heel leaf spring contact member for preventing welding of said silver contact buttons of said front anb back leaf spring contact members.
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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) | 1982-12-24 | 1983-06-25 | 1983-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-24 | 1987-06-25 | 1987-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-24 | 1991-06-25 | 1991-12-25 | $7700.00 | Window Closed / Lapsed |