US3424416A - Strain relief - Google Patents

Strain relief Download PDF

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Publication number
US3424416A
US3424416A US617613A US3424416DA US3424416A US 3424416 A US3424416 A US 3424416A US 617613 A US617613 A US 617613A US 3424416D A US3424416D A US 3424416DA US 3424416 A US3424416 A US 3424416A
Authority
US
United States
Prior art keywords
aperture
conductor
panel
strip
strain relief
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
Application number
US617613A
Other languages
English (en)
Inventor
Harry John Dell
Earl Earnest Folkenroth
William Joseph Garver
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TE Connectivity Corp
Original Assignee
AMP Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by AMP Inc filed Critical AMP Inc
Application granted granted Critical
Publication of US3424416A publication Critical patent/US3424416A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/08—Distribution boxes; Connection or junction boxes
    • H02G3/081—Bases, casings or covers
    • H02G3/083—Inlets

Definitions

  • a device for surrounding a wire conductor or similar rod-like member to prevent strain thereon serves to distribute the stress on the conductor over a relatively large area and further to serve as a means for mounting a conductor within a panel aperture and for preventing axial movement of the conductor relative to the aperture;
  • the device is formed of an elastomeric material and comprises a body member having an interior surface and an exterior surface, the exterior surface being joined at its opposite ends to the interior surface and being spaced at its intermediate position from the interior surface.
  • This invention provides a device which accommodates a broad range of conductor sizes and provides a strain relief for such conductors.
  • the device is mountable within a panel aperture and prevents axial movement of the conductor relative to the aperture.
  • the device may be supplied in strip form and may be cut to length to suit any desired panel aperture size.
  • FIGURE 1 is a perspective view of a strain relief device shown in successive stages of production and made in accordance with the teachings of the present invention
  • FIGURE 2 is a perspective View showing the device of FIGURE l partially surrounding a wire conductor
  • FIGURE 3 is a perspective view illustrating the strain relief device mounted in a panel aperture and surrounding a wire conductor
  • FIGURE 4 is a sectional view showing the strain relief device prior to insertion in a panel.
  • FIGURE 5 is asectional view showing the device after insertion in a panel.
  • FIGURE l there is shown a strip of material 10 which may conveniently be supplied in extruded form and made from a suitable elastomeric material.
  • the strip 10 ⁇ is of indefinite length and is severed to an appropriate length depending on a particular use.
  • the circumference of the aperture is determined and the end of strip 10 is then severed to a dimension equal to the circumference of the panel aperture.
  • Section 12 shown in FIGURE l represents a portion of strip 10 for use with a particular aperture size.
  • the section 12 has a generally diamond-shaped crosssectional configuration.
  • a pair of interior surfaces 14 and 16 are provided and have a plurality of ridges 18 disposed therealong which constitute gripping surfaces as described hereafter.
  • a pair of exterior surfaces 20 and 22 are also provided and are joined to the interior surfaces 14 and 16 along edges 24 and 26 respectively. Surfaces 20 and 22 are joined by a channel-shaped groove 218 which mates with a panel aperture in a manner to be described.
  • Section 12 is adapted to be wrapped around an electrical conductor or the like in a manner as shown in FIGURE 2. Since the conductor diameter is necessarily smaller than the diameter of the aperture through which the conductor will extend, the length of the interior surfaces 14 and 16 must be less than that of the exterior surfaces 20 and 22. The circumference of the electrical conductor to be mounted in the panel aperture is deter mined and this dimension is used to determine the size of surfaces 14 and 16.
  • Section 30 is shown in FIGURE 1 and is identical to section 12 except that the interior surfaces have been severed to appropriate length to accommodate the electrical conductor.
  • the channel 28 is the only portion of section 12 which remains at a dimension equal to that of the panel aperture circumference.
  • the strain relief device is shown in FIGURE 4 completely surrounding a conductor 32 and prepared for entry into the aperture 34 located in the panel 36.
  • the conductor 32., together with the device 30, is then inserted through the panel aperture 34 during which insertion the device is caused to be radially compressed, such compression being possible due to the space provided between the interior and exterior surfaces of the device.
  • the conductor is sufficiently moved in an axial direction through the aperture 34 the device 30 will snap into place within the aperture and the channel 28 will be located at the panel to maintain the device in position.
  • the aperture 34 will exert a pressure on the device 30 in a radially inward direction which will cause the device to rmly grip the conductor by means of the gripping surfaces 18. ⁇ In this maner the conductor is prevented from moving in an axial direction and further the device 30 serves to prevent rupturing of the conductor due to torsional stresses.
  • the strip of material 10 may be selectively severed to provide a strain relieving device capable of use with various size conductors and various size panel apertures. It is also apparent that by making the device slightly oversize relative to a panel aperture it is possible to produce increased pressure within the strain relief device to thereby provide a firmer ⁇ frictional connection between the device and the electrical conductor -to thereby further prevent against axial movement of the conductor relative to the panel.
  • a strip of material adapted to be formed into strain relieving means said strip of material comprising a rst pair of surfaces extending longitudinally along said strip, said first pair of surfaces being joined to each other along their longitudinal extent and being disposed at an angle to each other, means disposed along the juncture of said rst pair of surfaces for engaging a panel aperture, a second pair of surfaces extending longitudinally along said strip, said second pair of surfaces being separated from each other and being joined to said rst pair of surfaces, each of said second pair of surfaces being angularly disposed relative to said rst pair of surfaces and to each other whereby said strip is of generally open quadrilateral configuration, and gripping means disposed along said second pair of surfaces for engaging rod-like means ad-apted to extend through said panel aperture.
  • a strip as set forth in claim 1 wherein said aperture engaging means comprises a channel extending longitudinally along said strip.
  • Strain relieving means comprising in combination a panel having an aperture therein, cylindrical means extending through said aperture, and exible means disposed between said cylindrical means and said aperture, said flexible means comprising an interior surface in engagement with s aid cylindrical means and an exterior surface in engagement with said aperture, said exterior surface being joined at its opposite ends to said interior surface, said surfaces having portions thereof spaced from each other and movable toward and away from each other.
  • Strain relieving means as set forth in claim I4 further compnsing gripping means on said interior surface for engaging said cylindrical means.
  • Strain relieving means as set forth in claim 4 further comprising channel means disposed along said exterior surface for receiving said aperture.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Insulating Bodies (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Conductive Materials (AREA)
US617613A 1967-02-21 1967-02-21 Strain relief Expired - Lifetime US3424416A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US61761367A 1967-02-21 1967-02-21

Publications (1)

Publication Number Publication Date
US3424416A true US3424416A (en) 1969-01-28

Family

ID=24474331

Family Applications (1)

Application Number Title Priority Date Filing Date
US617613A Expired - Lifetime US3424416A (en) 1967-02-21 1967-02-21 Strain relief

Country Status (7)

Country Link
US (1) US3424416A (fr)
BE (1) BE710636A (fr)
DE (1) DE1615690A1 (fr)
ES (1) ES350363A1 (fr)
FR (1) FR1554344A (fr)
GB (1) GB1151835A (fr)
NL (1) NL6801522A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4156103A (en) * 1977-10-27 1979-05-22 Amp Incorporated Semi-rigid conduit connector
FR2509514A2 (fr) * 1980-12-03 1983-01-14 Midi Moulages Plast Piece perfectionnee pour l'isolation d'une douille d'appareil electrique et utilisation de celle-ci pour isoler une douille a vis
US4494779A (en) * 1982-07-14 1985-01-22 Thyssen-Bornemisza Inc. Connector fitting for electrical box
US4928349A (en) * 1987-07-15 1990-05-29 Yazaki Corporation Grommet structure
US10066655B2 (en) 2016-11-17 2018-09-04 Orbital Atk, Inc. Grommets and methods of installing grommets

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1204625A (en) * 1915-04-30 1916-11-14 New Process Specialty Company Bushing for electric tubular insulation.
US1817774A (en) * 1928-05-02 1931-08-04 Harry E Sipe Tubular coupling and method of constructing the same
US1967466A (en) * 1930-06-20 1934-07-24 James Henry Hayes Flexible pipe coupling
US2377510A (en) * 1942-09-26 1945-06-05 Dresser Ind Hinged self-sealing coupling
US2387295A (en) * 1943-09-14 1945-10-23 Adel Prec Products Corp Cushion for conduit and wire supporting clips
US2417741A (en) * 1943-06-24 1947-03-18 Hanlon Waters Division Of Gene Split packing ring coupling
US2420826A (en) * 1944-03-24 1947-05-20 Louis J Irrgang Strain relief for electrical conductors
US2449795A (en) * 1944-02-14 1948-09-21 Well Equipment Mfg Corp Pipe coupling
US2451354A (en) * 1945-10-08 1948-10-12 Robert L Ohls Pipe coupling
US2912712A (en) * 1955-10-31 1959-11-17 William S Shamban One-piece grommet
US3288407A (en) * 1965-02-08 1966-11-29 United Carr Inc Grommets

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1204625A (en) * 1915-04-30 1916-11-14 New Process Specialty Company Bushing for electric tubular insulation.
US1817774A (en) * 1928-05-02 1931-08-04 Harry E Sipe Tubular coupling and method of constructing the same
US1967466A (en) * 1930-06-20 1934-07-24 James Henry Hayes Flexible pipe coupling
US2377510A (en) * 1942-09-26 1945-06-05 Dresser Ind Hinged self-sealing coupling
US2417741A (en) * 1943-06-24 1947-03-18 Hanlon Waters Division Of Gene Split packing ring coupling
US2387295A (en) * 1943-09-14 1945-10-23 Adel Prec Products Corp Cushion for conduit and wire supporting clips
US2449795A (en) * 1944-02-14 1948-09-21 Well Equipment Mfg Corp Pipe coupling
US2420826A (en) * 1944-03-24 1947-05-20 Louis J Irrgang Strain relief for electrical conductors
US2451354A (en) * 1945-10-08 1948-10-12 Robert L Ohls Pipe coupling
US2912712A (en) * 1955-10-31 1959-11-17 William S Shamban One-piece grommet
US3288407A (en) * 1965-02-08 1966-11-29 United Carr Inc Grommets

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4156103A (en) * 1977-10-27 1979-05-22 Amp Incorporated Semi-rigid conduit connector
FR2509514A2 (fr) * 1980-12-03 1983-01-14 Midi Moulages Plast Piece perfectionnee pour l'isolation d'une douille d'appareil electrique et utilisation de celle-ci pour isoler une douille a vis
US4494779A (en) * 1982-07-14 1985-01-22 Thyssen-Bornemisza Inc. Connector fitting for electrical box
US4928349A (en) * 1987-07-15 1990-05-29 Yazaki Corporation Grommet structure
US10066655B2 (en) 2016-11-17 2018-09-04 Orbital Atk, Inc. Grommets and methods of installing grommets

Also Published As

Publication number Publication date
GB1151835A (en) 1969-05-14
BE710636A (fr) 1968-06-17
ES350363A1 (es) 1969-05-01
FR1554344A (fr) 1969-01-17
DE1615690A1 (de) 1970-07-16
NL6801522A (fr) 1968-08-22

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