Material anchoring or fixing device, has male part with progressive shoulders and female part presenting counter-shoulders relative male part, where device is spaced and expanded between walls when male part is inserted in female part

摘要

The device has a male part threaded in its center along longitudinal direction and including progressive shoulders. A female part presents counter-shoulders corresponding to dimensions of that of the male part. The device is spaced and expanded between parallel linear walls when the male part is introduced in the female part. A base of the female part includes an outer shoulder.