Patent ID: 6044536
Filing Date: 2000-04-04
Classification: F16B,Y10T

Abstract:
A method of making an assembly unit, comprising the steps of:providing a bolt having a bolt head, a shaft extending axially from the bolt head and defining a bolt axis, and a first retainer part extending radially from the shaft and spaced a first distance from the bolt axis;providing a sleeve having a tubular wall with first and second ends, a collar extending radially outwardly from the first end and having a bearing surface, and a transitional part interconnecting the tubular wall with the collar;providing a counterholder surface;inserting said bolt into said sleeve such that, said tubular wall surrounds said first retainer part, and said planar surface is positioned axially between said bearing surface and said bolt head; and thenapplying an axial force against said counterholder surface in a direction toward said bearing surface while forcing a stamping tool against said transitional part at an angle of approximately 30 degrees to 60 degrees relative to said bolt axis in a direction towards said counterholder surface, thereby forcing said counterholder surface against said bearing surface and plastically deforming said transitional part in an axial direction toward said counterholder surface and a radial direction toward said bolt axis, whereby a protrusion is formed that extends radially from said tubular wall toward said shaft and is spaced from said bolt axis a second distance which is less than said first distance and has upper surface that is substantially coplanar with at least a portion of said bearing surface, such that said sleeve is slidable along said shaft away from said bolt head until the protrusion engages said first retainer part.