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Strain-relief bushing for cables and the like

  • US 4,056,252 A
  • Filed: 04/10/1975
  • Issued: 11/01/1977
  • Est. Priority Date: 01/20/1975
  • Status: Expired due to Term
First Claim
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1. A strain-relief bushing for a cable or the like extending through an opening in a wall of a casing and being subjected to a longitudinal tension force, said bushing comprising a circumferentially complete body of an uninterrupted cross-section having an internal axial passage therethrough, through which a cable is adapted to extend and having an internal wall extending through said passage substantially parallel to the axis thereof and being connected only at one end to the remainder of said body, said internal wall being of one piece with said body and being movable only in a direction transverse to said axis, said body having a pair of opposite circular groove portions on the outer surface thereof located in a substantially common plane in which parts of said casing wall about said opening are engaged, said body having a threaded bore extending therethrough and so arranged that its axis encloses an acute angle with said axis of said axial passage and intersects said common plane of said groove portions;

  • and a threaded pressure-exerting element extending through said bore and exerting pressure against said internal wall at said acute angle relative to the same and in a direction against said tension force to thereby press said internal wall against the cable and to press thereby one of said groove portions into a corresponding portion of said casing wall about said opening, creating thereby a reaction force which presses the opposite groove portion likewise into a corresponding portion of said casing wall to thereby clamp the cable in said axial passage and said bushing in said opening in said casing wall.

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