Strain relief

• US 5,857,046 A
• Filed: 02/12/1997
• Issued: 01/05/1999
• Est. Priority Date: 02/12/1997
• Status: Expired due to Term

• Current Assignee: Tyco Electronics Services GmbH (TE Connectivity Ltd. (United Kingdom))
• Original Assignee: The Whitaker Corporation (Meggitt PLC)
• Inventors: Hileman, Ronald Allan, Barkus, Lee Andrew
• Primary Examiner(s): Palmer, Phan T. H.
• Application Number:
  US08/798,814
• Time in Patent Office: 692 Days
• Field of Search: 385/86, 385/53, 385/55, 385/58, 385/60, 385/62, 385/72, 385/76, 385/77, 385/78, 385/81, 385/87
• US Class Current: 385/86
• CPC Class Codes: G02B 6/38875 Protection from bending or twisting
• CPC Class Codes: G02B 6/3888 Protection from over-extension or over-compression

Abstract

The invention relates to an improved strain relief adapted for mounting within a connector housing so as to protect a terminated cable assembled thereto from damage as a result of flexure of the cable relative to the housing. The strain relief including a sleeve having a proximal portion, a distal portion, and a central lumen disposed therebetween. The sleeve being adapted to slidingly receive the cable within the central lumen. The distal portion of the strain relief includes a substantially rigid tube that has a pair of shoulders which project radially-outwardly from an external surface of the distal portion in diametrically-opposed relation to one another. An annular shoulder is positioned in spaced relation to the pair of shoulders and projects radially-outwardly from the external surface of the strain relief. A recess is defined between the pair of shoulders and the annular shoulder. The strain relief structure is adapted to be assembled to a correspondingly shaped receptacle portion of a connector housing.

Claims

1. A strain relief adapted for mounting within a connector housing so as to protect a terminated cable assembled thereto from damage as a result of flexure of said cable relative to said housing, said strain relief comprising, in combination:

a sleeve having a proximal portion, a distal portion, and a central lumen extending therebetween, said sleeve being adapted to slidingly receive said cable within said central lumen;

said distal portion of said strain relief comprising a substantially rigid tube including a pair of shoulders that project radially-outwardly from an external surface of said distal portion in diametrically-opposed relation to one another and an annular shoulder spaced away from said pair of shoulders and projecting radially-outwardly from said external surface wherein a recess is defined between said pair of shoulders and said annular shoulder and further wherein said connector housing comprises a receptacle adapted to snugly receive said strain relief so as to substantially absorb stresses induced therein during said flexure of said terminated cable.

2. A strain relief according to claim 1 wherein said receptacle comprises a first half and a second half each adapted to be assembled in surrounding relation to said strain relief so as to form a whole receptacle within said connector housing, each receptacle half including an outer wall, a first internal shoulder disposed in spaced-relation to said outer wall so as to define a first recess therein that comprises a profile that is substantially similar to the shape of said outer shoulders and a second internal shoulder disposed in spaced-relation to said first internal shoulder so as to define a second recess therebetween that comprises a profile that is substantially similar to the shape of said annular shoulder.

3. A strain relief according to claim 2 wherein said outer shoulders comprise a substantially inclined-ramp shape.

4. A strain relief according to claim 2 wherein said annular shoulder comprises at least two truncated sides.

5. A strain relief according to claim 1 wherein said sleeve is tapered.

6. A strain relief according to claim 1 wherein said sleeve defines a plurality of regularly spaced elongated slots transversely through the thickness of said proximal portion of said sleeve and a plurality of protrusions that each project longitudinally into the void defined by each said slot and from the portions of said sleeve that define the lateral sides of said slots.

7. A strain relief according to claim 1 wherein said distal portion of said sleeve includes a crimp body portion comprising a relatively rigid tubular shape and having a pair of diametrically-opposed cantilevered ramps formed therein, said ramps being adapted to be pushed inwardly against said cable when at least one outer crimp ring is crimped thereover so as to further secure said cable to said strain relief.

8. A strain relief adapted for mounting within a connector housing so as to protect a terminated cable assembled thereto from damage as a result of flexure of said cable relative to said housing, said strain relief comprising:

a tapered tubular proximal portion and a tubular distal portion said strain relief being adapted to slidingly receive said cable therein;

said tubular distal portion comprising a pair of ramp-shaped shoulders each projecting radially-outwardly from an external surface of said tubular distal portion in diametrically-opposed relation to one another and an annular shoulder disposed in spaced relation to said pair of shoulders and projecting radially-outwardly from said external surface wherein a recess is defined between said pair of shoulders and said annular shoulder; and

further wherein

said connector housing comprises a receptacle adapted to snugly receive said strain relief so as to substantially absorb stresses induced therein during said flexure of said terminated cable, said receptacle comprising a first internal shoulder disposed in spaced relation to an outer wall of said housing so as to form a first recess therein that comprises a profile that is shaped substantially similar to the shape of said outer shoulders and a second internal shoulder disposed in spaced relation to said first internal shoulder so as to form a second recess therebetween that is shaped substantially similar to the shape of said annular shoulder.