Family of fastening elements, check gauges and method for controlling the choice of the length of a fastening element

摘要

The invention refers to a family of fastening devices including at least two fastening elements (101, 121), each one of said elements including a shaped end portion (105), a frontal face (106) of the shaped end portion (105) having a cavity (107) extending as far as a bottom (108),;the fastening elements having different maximum grips (Gmax), the family being configured so that the distance (109′) between the bottom (108) of the cavity (107) and the limit (170) between the body and the shaped end portion is identical for all the fastening elements (101, 121).;The invention refers moreover to a unit (100) including such a family of fastening devices and a check gauge (150), as well as a method for checking of the choice of the length of a fastening element (101, 121), by means of the check gauge (150).

主权项

1. Family of fastening devices including at least two fastening elements, each one of said elements extending according to a first axis and including a head, a smooth body and a shaped end portion which are aligned, said shaped end portion consists of a thread or swaging grooves, a frontal face of the shaped end portion having a cavity extending parallel to the first axis as far as a bottom,
said at least two fastening elements defining first and second fastening elements having shaped end portions having identical average external diameters, said first and second fastening elements having different maximum grips, said maximum grip corresponding to the length of the smooth body according to the first axis between the head and a boundary between said smooth body and the shaped end portion, said first and second fastening elements in the family being configured so that a depth of the cavity in the first fastening element is different than a depth of the cavity in the second fastening element, and a distance according to the first axis between the bottom of the cavity and the boundary between the smooth body and the shaped end portion of the first fastening element is identical to a distance according to the first axis between the bottom of the cavity and the boundary between the smooth body and the shaped end portion of the second fastening element.