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Insert kit and installation method

  • US 9,194,419 B2
  • Filed: 05/12/2009
  • Issued: 11/24/2015
  • Est. Priority Date: 05/16/2008
  • Status: Active Grant
First Claim
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1. An insert assembly kit comprising:

  • a generally cylindrical stepped insert having;

    a first cylindrical insert portion of a first insert diameter and a first axial length and the first insert diameter extending over the first axial length,a second cylindrical insert portion of a second insert diameter and a second axial length and the second insert diameter extending over the second axial length,a third cylindrical insert portion of a third insert diameter and a third axial length and the third insert diameter extending over the third axial length,in which the first insert diameter is greater than the second and third insert diameters, the second insert diameter is greater than the third insert diameter, and the second insert portion is positioned axially between the first and third insert portions,the insert assembly kit further comprising;

    a plastics part having a generally cylindrical stepped bore defining;

    a first cylindrical bore portion of a first bore diameter and a first axial length approximately the first axial length of the first insert portion,a second cylindrical bore portion of a second bore diameter and a second axial length approximately the second axial length of the second insert portion, anda third cylindrical bore portion of a third bore diameter and a third axial length approximately the third axial length of the third insert portion,the stepped insert having a number of the cylindrical insert portions equal to a number of the cylindrical bore portions of the plastic part, wherein each of the first, second and third cylindrical insert portions is configured such that each of the insert portions is the only one of the insert portions respectively configured to be received in a respective one of the first, second and third bore portions,wherein the first bore diameter is greater than the second and third bore diameters, the second bore diameter is greater than the third bore diameter, and the second bore portion is positioned axially between the first and third bore portions,wherein the first, second and third bore portion diameters are smaller than the first, second and third insert portion diameters respectively, configuring the bore portions to engage and thereby retain the respective insert portions upon installation of the stepped insert into the plastics part and locating and centralizing the insert portions in the respective bore portions,each of the first, second and third insert portions includes a respective cylindrical periphery, and each of the cylindrical peripheries includes a respective movement resistant feature on the cylindrical periphery thereof, whereina first one of the movement resistant features on a first one of the insert portion cylindrical peripheries comprises torque resistant features on the first one of the insert portion cylindrical peripheries, the first one of the insert portion cylindrical peripheries is shaped such that with the first one of the insert portions cylindrical peripheries engaging the respective bore portion for the first one of the insert portion cylindrical peripheries, the respective torque resistant features resist torque on the insert;

    a second one of the movement resistant features on a second one of the insert portion cylindrical peripheries comprises pull out resistant features on the second one of the insert portion cylindrical peripheries, the second one of the insert portion cylindrical peripheries is shaped such that with the second one of the insert portion cylindrical peripheries engaging the respective bore portion for the second one of the insert portion cylindrical peripheries, the respective pull out resistant features resist pull out of the insert from the respective bore portion, andwherein the second one of the insert portion cylindrical peripheries with pull out resistant features has no torque resistant features;

    wherein the first bore diameter is greater than second and third insert diameters, and the second bore diameter is greater than the third insert diameter such that the second and third insert portions are accurately located and centralized within the first and second bore portions respectively when the insert is initially installed in the bore, and prior to insertion of each insert portion into its respective bore portion which configuration accurately locates and centralizes the insert prior to the insertion of each insert portion into its respective bore portion.

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