Patent US4531016A successfully refreshed from Google Patents.
US4531016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-edge spring insert for twist-on connectors
Assignee: Buchanan Construction Products Inc
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Filing: 1984-03-05
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Granted: 1985-07-23
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Expires: 2004-03-05
Abstract
Abstract Prior to coiling, the wire to be used as the spring insert of twist-on connectors is mechanically worked to form at least two relatively sharp edges. When coiling is accomplished such edges are positioned to extend inwardly into the core of such coils to mechanically engage and retain conductors placed within said core. Similar sharp edges can be formed on spring inserts having a wide range of initial cross-section profiles.
Inventors
- 👤 Wolfgang Duve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:33
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/02; F16F1/04; F16F1/042; F16F1/08; H; H01; H01R; H01R4/00; H01R4/22; H01R4/28; H01R4/48; H01R4/4854; H01R4/4863
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
In a twist-on connector for engaging at least one electrical conductor, having an external insulating shell and a coiled wire spring insert comprising a plurality of turns of wire providing a hollow core therein for the receipt of at least one electrical conductor, the improvement comprising at least two continuous sharp edged ribs formed on each turn and extending along substantially the entire turn of said coiled wire spring insert, said ribs extending into said hollow core of said insert to engage and mechanically hold electrical conductors inserted therein.
Claim 2
Dependent Claim
89 words
In a twist-on connector for engaging at least one electrical conductor, having an external insulating shell and a coiled wire spring insert comprising a plurality of turns of wire providing a hollow core therein for the receipt of at least one electrical conductor, the improvement comprising at least two continuous sharp edged ribs formed on each turn and extending along substantially the entire turn of said coiled wire spring insert, said ribs extending into said hollow core of said insert to engage and mechanically hold electrical conductors inserted therein.
Claim 3
Dependent Claim
38 words
The twist-on connector as defined in claim 1, wherein the wire forming said coiled wire spring insert has a square cross-section and is wound to present a diagonal thereof generally perpendicular to the longitudial axis of said connector.
Claim 4
Dependent Claim
23 words
The twist-on connector as defined in claim 2, wherein said two sharp edged ribs are formed adjacent said diagonal of said square wire.
Claim 5
Dependent Claim
21 words
The twist-on connector as defined in claim 1, wherein said coiled wire spring insert has three sharp edged ribs formed thereon.
Claim 6
Dependent Claim
38 words
The twist-on connector as defined in claim 4, wherein the wire forming said coiled wire spring insert has a square cross-section and is wound to present a diagonal thereof generally perpendicular to the longitudinal axis of said connector.
Claim 7
Dependent Claim
24 words
The twist-on connector as defined in claim 5, wherein said three sharp edged ribs are formed symetrically about said diagonal of said square wire.
Claim 8
Dependent Claim
39 words
The twist-on connector as defined in claim 1, wherein the wire forming said coiled wire spring insert has a tear-drop shaped cross-section and is wound to present its major axis generally perpendicular to the longitudial axis of said connector.
Claim 9
Dependent Claim
25 words
The twist-on connector as defined in claim 7, wherein said two sharp edged ribs are formed adjacent the major axis of said tear-drop shaped wire.
Claim 10
Dependent Claim
38 words
The twist-on connector as defined in claim 1, wherein the wire forming said coiled wire spring insert has a circular cross-section and is wound to present a predetermined diameter generally perpendicular to the logitudinal axis of said connector.
Claim 11
Dependent Claim
25 words
The twist-on connector as defined in claim 9, wherein said two sharp edged ribs are formed adjacent said predetermined diameter of said circular cross-section wire.
References Cited (Backward Citations)
US2292236A
Cited
US3320355A
Cited
US3350499A
Cited
US3497607A
Cited
US3875324A
Cited
US4035577A
Cited
US4104482A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |