US3249909A - Strain-relieved electrical cord device - Google Patents
Strain-relieved electrical cord device Download PDFInfo
- Publication number
- US3249909A US3249909A US323956A US32395663A US3249909A US 3249909 A US3249909 A US 3249909A US 323956 A US323956 A US 323956A US 32395663 A US32395663 A US 32395663A US 3249909 A US3249909 A US 3249909A
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- US
- United States
- Prior art keywords
- cord
- jacket
- strain
- conductors
- plug
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/58—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable
- H01R13/5833—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable the cable being forced in a tortuous or curved path, e.g. knots in cable
Definitions
- My invention relates to electric cord sets and more particularly to means for providing a strain-relief to protect the electrical connections between the conductors in the cord and the contact members in the plug from mechanical strains produced when force is applied to the cord, rather than directly to the plug, for disconnecting the latter from a receptacle.
- a sharp bend is formed in a jacketed portion of the cord and the plug body is molded around this bent portion. Consequently, force applied to the cord will be transmitted through the relatively strong jacket thereof directly to the plug body mechanically, and without relying on a bond between the-m.
- Any suitable means may be utilized for providing the sharp bend in the cord.
- One preferred means in accordance with my invention is to tie a simple knot in the jacketed portion of the cord closely adjacent to the end thereof to which it is desired to connect the plug, the latter then being molded around the knot.
- Another is to thread the cord through closely spaced apertures in a stiff plate member so as to provide a sharp bend in the former, the plug then being molded around the bent portion of the cord and the plate member.
- FIG. 1 is a cross-sectional view of a molded plug embodying a strain relief provided by tying a knot in the cord;
- FIG. 2 is a cross-sectional view of the device shown in FIG. 1, but taken at 90 thereto;
- FIG. 3 is a view similar to FIG. 1, but showing a strain relief provided by threading the cord through an aper tured plate;
- FIG. 4 is a cross-sectional view of the arrangement shown in FIG. 3, but taken at thereto;
- FIG. 5 is a cross-sectional view of a cordwinder, the cord of which is provided with a snubber having a strain relief in accordance with the present invention located adjacent to the plug end of the cord in order to relieve the plug of strain when the cord is completely rewound.
- a plug body 22 is molded around the knot 20, the extending ends of the individually insulated conductors 14 and the inner ends of the contact prongs 18, including the anchoring lugs 19.
- the plug 22 is preferably molded of vinyl which will not form a bond with the rubber material of jacket 12.
- this force will be transmitted directly through the cord jacket 12 to the knotted portion of the cord and directly to the plug body 22 and thence via the anchoring lugs 19 to the prongs 18 without producing stress in the conductors 14 and particularly their connections with the contact prongs 18.
- the jacketed portion of the cord 10 adjacent one end thereof is threaded through closely spaced apertures 24 formed in a sheet or plate 26 of stilf material, which forces the cord to assume a sharp bend, as indicated at 28, and the plug 22a is molded around this bent portion of the cord, and of course around the plate 26.
- This arrangement functions in much the same manner as that described in connection with FIGS. 1 and 2.
- a tensile force applied to the enclosing jacket 12 of the cord 10 is transmitted through the bent portion thereof directly to the body 22a of the plug, and thence to the prongs'18, and the individual conductors, and particularly the connections thereof to the prongs 18, are entirely relieved of strain.
- the bent portion of the cord is somewhat resilient and hence, if the pull on the cord is in the form of a sudden jerk, the bent portion absorbs some of the shock.
- FIG. 5 there is shown a cordwinder for reeling up a cord 10a.
- the cordwinder includes a casing 30 within which is disposed a fixed shaft 32.
- Rotatably mounted on the shaft is a hub 34 of a reel having cylindrical drum 36 supported from the hub by means of spokes 38.
- Drum 36 carries a pair of spaced flanges, one of which is shown at 40.
- a spiral clock spring 42 is connected between the inner surface of drum 36 and the fixed shaft 32 and tends to rotate the drum in the direction of the arrow A.
- One end of the cord 10a is secured to the drum 36, while the other end extends outwardly through an opening 44 formed in the casing 30.
- a plug 46 is secured to the end of the cord and this plug may be in accordance with either of the embodiments previously described, or might be an ordinary plug without strain relief. Close to the plug the cord has a knot 20a tied therein and a body 48 of plastic material, such as vinyl, is molded around the knot.
- the extending end of the cord is grasped and pulled outwardly, thus rotating the drum 36 in a direction counter to the arrow A which causes the spiral spring 42 to be wound.
- Suitable latch mechanism is
- the plug 46 may then be inserted in a suitable receptacle so as to furnish electric power to the appliance with which the cord reel is used.
- an insulated electrical cord comprising a plurality of .individually insulated conductors encased within a relatively strong insulating and protective tubular jacket, said electrical cord including said jacket having a plurality of closely adjacent sharply bent portions within the length thereof, a body of material molded around and supporting said sharply bent jacketed cord portions in an enclosing and closely embracing manner whereby a tensile strain applied to the cord is directly transmitted by said jacket to said body through substantially the entire outer surface of said jacket Within said sharply bent portions thereof to thereby maintain said insulated conductors within said jacket free of said strain.
- strain-relieved electrical cord device as defined in claim 1 wherein said sharply bent portions of said insulated jacketed cord comprise a knot tied therein.
- strain-relieved electrical cord device as defined in claim 1 wherein said sharply bent portions of said jacketed cord include a plate member having a plurality of closely spaced apertures therethrough,
- an insulated electrical cord comprising a pair of individually insulated conductors, a relatively strong insulating and protective tubular jacket enclosing said individually insulated conductors, said conductors having portions extending a short distance out of one end of said enclosing jacket, a pair of contacts electrically connected to the extending ends of said conductors, said cord including said insulating jacket having .a plurality of closely adjacent slightly resilient sharply bent portions therein adjacent to said one end of the jacket, and a body of material molded around and enclosing and closely embracing said sharply bent portion of said jacketed cord and said extending ends of the conductors and at least a portion of said contacts whereby a tensile force applied to said cord including said insulating jacket and said sharply bent portions therein adjacent to said one end'of the jacket is transmitted directly to and through said body to said contacts by substantially the entire outer surface of said jacket within said slightly resilient sharply bent portions to thereby maintain said insulated
- an insulated electric cord comprising a pair of individually insulated conductors enclosed in a relatively strong insulating jacket, said conductors extending a short distance out of one end of said jacket adjacent an end of said cord, a pair of contacts electrically connected to the extending ends of said conductors, said cord including said jacket being tied in a knot adjacent to said end of the cord, and a body of material molded around and enclosing and closely embracing said knot and the extending ends of said conductors and at least a portion of said contacts whereby a tensile force applied to said cord is transmitted directly from substantially the entire outer surface of said jacket within said knot directly to and through said body to said contacts resulting in said conductors and the connections between said conductors and said contacts being relieved of stress caused by the applied force.
- an insulated electric cord comprising a pair of individually insulated conductors enclosed ina relatively strong insulating jacket, said condutcors extending a short distance out of one end of said jacket adjacent one end of said cord, a pair of contacts electrically connected to the extending ends of said conductors, a plate member having a plurality of closely spaced apertures therethrough, said cord having portions including said jacket adjacent to said end of the latter extending through said apertures so as to be sharply bentthereby, and a body of material molded around and enclosing and closely embracing said plate member and said bent portions and the extending ends of said conductors and at least a portion of said contacts whereby a tensile force applied to the cord is transmitted directly to said body from substantially the entire outer surface of said jacket at the plate-bent portions thereof through said body to said contacts, said conductors and the connections beween said conductors and said contacts being thereby relieved of stress produced by said force.
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Description
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US323956A US3249909A (en) | 1963-11-15 | 1963-11-15 | Strain-relieved electrical cord device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US323956A US3249909A (en) | 1963-11-15 | 1963-11-15 | Strain-relieved electrical cord device |
Publications (1)
Publication Number | Publication Date |
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US3249909A true US3249909A (en) | 1966-05-03 |
Family
ID=23261440
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US323956A Expired - Lifetime US3249909A (en) | 1963-11-15 | 1963-11-15 | Strain-relieved electrical cord device |
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US (1) | US3249909A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3407377A (en) * | 1967-06-29 | 1968-10-22 | Electrolux Corp | Electric cord set having a stress relieving plug |
US4586776A (en) * | 1979-11-23 | 1986-05-06 | Associated Enterprises, Inc. | Cable termination assembly and wire stripping apparatus and method |
US4850886A (en) * | 1988-02-01 | 1989-07-25 | Berke Joseph J | Power cord decoupler and method |
US5470238A (en) * | 1994-02-09 | 1995-11-28 | Intercon Systems, Inc. | Shielded ribbon cable electrical connector assembly and method |
US20020127915A1 (en) * | 1999-12-09 | 2002-09-12 | Yazaki Corporation | Waterproofing apparatus for terminal connecting portion of sheathed wire |
EP2619866A1 (en) * | 2010-09-21 | 2013-07-31 | Yazaki Corporation | Connecting structure and connecting method of fiber conductor wire |
CN104600533A (en) * | 2013-10-31 | 2015-05-06 | 北京实验工厂 | Internal wire margin control method of electric connector |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1731274A (en) * | 1924-06-02 | 1929-10-15 | Electric Safety Razor Corp Of | Electric cord connecter |
US1856681A (en) * | 1930-07-23 | 1932-05-03 | Robeson B Wolcott | Electrical connecter |
US2209814A (en) * | 1940-02-06 | 1940-07-30 | Gen Electric | Electrical connector |
GB528195A (en) * | 1939-04-22 | 1940-10-24 | Charles Reginald Cook | Improvements in or relating to electrical lead wires and their attachment to coupling plugs or other devices |
US2223153A (en) * | 1939-02-10 | 1940-11-26 | Diamond Wire & Cable Co | Strain relief for conductors |
US2566912A (en) * | 1947-12-30 | 1951-09-04 | Gen Electric | Strain relief device |
US2636070A (en) * | 1949-09-27 | 1953-04-21 | Whitney Blake Co | Self-locking electrical connector |
GB739759A (en) * | 1953-01-29 | 1955-11-02 | Philips Electrical Ind Ltd | Improvements in or relating to electric contact plugs comprising a resilient envelope |
FR1123341A (en) * | 1955-03-09 | 1956-09-20 | Improvement in socket outlets | |
DE1020395B (en) * | 1953-07-30 | 1957-12-05 | Rheydt Kabelwerk Ag | Strain-relieved fastening of the wires of unreinforced lines or cables under tension in plugs, terminations, sleeves etc. like |
US3093432A (en) * | 1960-10-27 | 1963-06-11 | Honeywell Regulator Co | Molded electrical cord connector |
-
1963
- 1963-11-15 US US323956A patent/US3249909A/en not_active Expired - Lifetime
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1731274A (en) * | 1924-06-02 | 1929-10-15 | Electric Safety Razor Corp Of | Electric cord connecter |
US1856681A (en) * | 1930-07-23 | 1932-05-03 | Robeson B Wolcott | Electrical connecter |
US2223153A (en) * | 1939-02-10 | 1940-11-26 | Diamond Wire & Cable Co | Strain relief for conductors |
GB528195A (en) * | 1939-04-22 | 1940-10-24 | Charles Reginald Cook | Improvements in or relating to electrical lead wires and their attachment to coupling plugs or other devices |
US2209814A (en) * | 1940-02-06 | 1940-07-30 | Gen Electric | Electrical connector |
US2566912A (en) * | 1947-12-30 | 1951-09-04 | Gen Electric | Strain relief device |
US2636070A (en) * | 1949-09-27 | 1953-04-21 | Whitney Blake Co | Self-locking electrical connector |
GB739759A (en) * | 1953-01-29 | 1955-11-02 | Philips Electrical Ind Ltd | Improvements in or relating to electric contact plugs comprising a resilient envelope |
DE1020395B (en) * | 1953-07-30 | 1957-12-05 | Rheydt Kabelwerk Ag | Strain-relieved fastening of the wires of unreinforced lines or cables under tension in plugs, terminations, sleeves etc. like |
FR1123341A (en) * | 1955-03-09 | 1956-09-20 | Improvement in socket outlets | |
US3093432A (en) * | 1960-10-27 | 1963-06-11 | Honeywell Regulator Co | Molded electrical cord connector |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3407377A (en) * | 1967-06-29 | 1968-10-22 | Electrolux Corp | Electric cord set having a stress relieving plug |
US4586776A (en) * | 1979-11-23 | 1986-05-06 | Associated Enterprises, Inc. | Cable termination assembly and wire stripping apparatus and method |
US4850886A (en) * | 1988-02-01 | 1989-07-25 | Berke Joseph J | Power cord decoupler and method |
US5470238A (en) * | 1994-02-09 | 1995-11-28 | Intercon Systems, Inc. | Shielded ribbon cable electrical connector assembly and method |
US20020127915A1 (en) * | 1999-12-09 | 2002-09-12 | Yazaki Corporation | Waterproofing apparatus for terminal connecting portion of sheathed wire |
EP2619866A1 (en) * | 2010-09-21 | 2013-07-31 | Yazaki Corporation | Connecting structure and connecting method of fiber conductor wire |
EP2619866A4 (en) * | 2010-09-21 | 2014-08-20 | Yazaki Corp | Connecting structure and connecting method of fiber conductor wire |
US9077088B2 (en) | 2010-09-21 | 2015-07-07 | Yazaki Corporation | Connecting structure and connecting method of fiber conductor wire |
CN104600533A (en) * | 2013-10-31 | 2015-05-06 | 北京实验工厂 | Internal wire margin control method of electric connector |
CN104600533B (en) * | 2013-10-31 | 2016-08-31 | 北京实验工厂 | A kind of electrical connector interior wire surplus control method |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FIRST NATIONAL BANK OF BOSTON, THE Free format text: SECURITY INTEREST;ASSIGNOR:EL ACQUISITION CORPORATION;REEL/FRAME:004923/0862 Effective date: 19871030 |
|
AS | Assignment |
Owner name: FIRST BOSTON SECURITIES CORP. Free format text: SECURITY INTEREST;ASSIGNOR:ELECTROLUX CORPORATION A CORP. OF DE.;REEL/FRAME:005195/0287 Effective date: 19891024 Owner name: WESRAY CAPITAL CORPORATION Free format text: SECURITY INTEREST;ASSIGNOR:ELECTROLUX CORPORATION A CORP. OF DE.;REEL/FRAME:005195/0287 Effective date: 19891024 Owner name: BANCBOSTON INVESTMENTS INC., Free format text: SECURITY INTEREST;ASSIGNOR:ELECTROLUX CORPORATION A CORP. OF DE.;REEL/FRAME:005195/0287 Effective date: 19891024 Owner name: WELLS FARGO & CO. Free format text: SECURITY INTEREST;ASSIGNOR:ELECTROLUX CORPORATION A CORP. OF DE.;REEL/FRAME:005195/0287 Effective date: 19891024 Owner name: FIRST BOSTON MEZZANINE INVESTMENT PARTNERSHIP - 9 Free format text: SECURITY INTEREST;ASSIGNOR:ELECTROLUX CORPORATION A CORP. OF DE.;REEL/FRAME:005195/0287 Effective date: 19891024 |
|
AS | Assignment |
Owner name: FIRST BOSTON MEZZANINE INVESTMENT PARTNERSHIP - 9 Free format text: SECURITY INTEREST;ASSIGNOR:ELECTROLUX CORPORATION;REEL/FRAME:005206/0691 Effective date: 19891024 Owner name: WESRAY CAPITAL CORPORATION Free format text: SECURITY INTEREST;ASSIGNOR:ELECTROLUX CORPORATION;REEL/FRAME:005206/0691 Effective date: 19891024 Owner name: BANCBOSTON INVESTMENTS INC. Free format text: SECURITY INTEREST;ASSIGNOR:ELECTROLUX CORPORATION;REEL/FRAME:005206/0691 Effective date: 19891024 Owner name: FIRST BOSTON SECURITIES CORP. Free format text: SECURITY INTEREST;ASSIGNOR:ELECTROLUX CORPORATION;REEL/FRAME:005206/0691 Effective date: 19891024 Owner name: WELLS FARGO & CO. Free format text: SECURITY INTEREST;ASSIGNOR:ELECTROLUX CORPORATION;REEL/FRAME:005206/0691 Effective date: 19891024 |
|
AS | Assignment |
Owner name: EL ACQUISITION CORPORATION, N/K/A ELECTROLUX CORP. Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:BANKBOSTON NA;REEL/FRAME:009580/0655 Effective date: 19980831 |
|
AS | Assignment |
Owner name: ELECTROLUX CORPORATION, CONNECTICUT Free format text: RELEASE OF SECURITY INTEREST;ASSIGNORS:BANCBOSTON INVESTMENTS, INC.;WELLS FARGO & CO.;FIRST BOSTON MEZZANINE INVESTMENT PARTNERSHIP - 9;AND OTHERS;REEL/FRAME:009773/0310 Effective date: 19980831 |