US4047787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extension cords for plug-in telephones
Assignee: Nortel Networks Ltd
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Filing: 1977-01-21
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Granted: 1977-09-13
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Expires: 1997-01-21
Abstract
Abstract An extension cord for plug-in telephones comprises a line cord having a plug at one end for insertion in a telephone outlet and multi-outlet member on the other end. The multi-outlet member is in the form of a hollow box-like member in the front of which are at least two apertures with a jack aligned with an behind each aperture for insertion of a plug. A back cover is attached to the multi-outlet member and the line cord enters through a slot in the cover. The jacks are wired in parallel to the line cord. A latch can be provided on the plug of the line cord and the aperture can be profiled to provide latch engaging formations.
Inventors
- 👤 Beverly William Gumb
- 👤 Gerd Kuhfus
- 👤 Frederick Thomas Cogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:58
CPC Classifications
H; H02; H02G; H02G3/00; H02G3/02; H02G3/08; H02G3/16; H01; H01R; H01R31/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
249 words
An extension cord for plug-in telephones, comprising: a line cord; a plug on one end of said line cord, said plug adapted for insertion in a telephone outlet; a multi-outlet member on the other end of said cord, said multi-outlet member comprising a main part of hollow box-like form having a front, top and bottom, and ends, at least two apertures in said front, each aperture having a predetermined profile for reception of a plug therein, a jack aligned with each aperture on the inside of said front, each jack having a lower part integral with said front and comprising two spaced apart side walls extending normal to said front and a bridge member at the rear of said side walls and extending between said side walls and integral therewith, and an upper part positioned on said lower part and including two spaced apart parallel channels in an undersurface thereof, said channels slidable on said side walls of said lower part; a retaining member on each end on the inside thereof and two further retaining members extending from the inside of said front, said retaining members extending over said side walls of said lower parts to retain said top parts of said jacks on said lower parts; and a back cover attached to the main part, a slot in said back, said line cord passing through said slot into the multi-outlet member, the conductors in said line cord connected to conductors in said jacks, said jacks connected in parallel.
Claim 2
Dependent Claim
249 words
An extension cord for plug-in telephones, comprising: a line cord; a plug on one end of said line cord, said plug adapted for insertion in a telephone outlet; a multi-outlet member on the other end of said cord, said multi-outlet member comprising a main part of hollow box-like form having a front, top and bottom, and ends, at least two apertures in said front, each aperture having a predetermined profile for reception of a plug therein, a jack aligned with each aperture on the inside of said front, each jack having a lower part integral with said front and comprising two spaced apart side walls extending normal to said front and a bridge member at the rear of said side walls and extending between said side walls and integral therewith, and an upper part positioned on said lower part and including two spaced apart parallel channels in an undersurface thereof, said channels slidable on said side walls of said lower part; a retaining member on each end on the inside thereof and two further retaining members extending from the inside of said front, said retaining members extending over said side walls of said lower parts to retain said top parts of said jacks on said lower parts; and a back cover attached to the main part, a slot in said back, said line cord passing through said slot into the multi-outlet member, the conductors in said line cord connected to conductors in said jacks, said jacks connected in parallel.
Claim 3
Dependent Claim
101 words
An extension cord as claimed in claim 1, each said top part of a jack including a plurality of bores extending therethrough in a direction normal to said front, and spring contacts in said bores, said spring contacts extending forward through said bores and bent down to extend down the front of said upper part, said contacts then bent rearwards beneath said upper part, and slots in said bridge member of each lower part, said slots extending downward from a top edge of said bridge member, said contacts positioned one in each slot with said top part on said lower part.
Claim 4
Dependent Claim
61 words
An extension cord as claimed in claim 1, said profile of each of said apertures including a bottom edge, said bottom edge stepped and including a centre portion and at least one step on each step of said centre portion, said steps forming a latch retaining means on a latch of a plug inserted in an aperture into the related jack.
Claim 5
Dependent Claim
23 words
An extension cord as claimed in claim 1, including latch means on said plug for releasably retaining said plug in a telephone outlet.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |