Patent ID: 8579567
Filing Date: 2013-11-12
Classification: F16B

Abstract:
1. A blind fastening device for fastening an assembly of a set of predrilled elements, comprising: a mandrel stem including a threaded part forming a traction mandrel; a first sleeve and a second deformation sleeve, configured to be slipped with slight play onto the mandrel stem; wherein the mandrel stem comprises a head on an inaccessible side of the set of predrilled elements, on which the second deformation sleeve rests prior and during installation, wherein the second deformation sleeve is configured to deform on the inaccessible side of the set of predrilled elements, between the head of the mandrel stem and an end part of the first sleeve, wherein the first sleeve is configured to come to bear on an accessible-side face of the set of predrilled elements to be assembled, wherein the first sleeve is configured to deform radially until conforming in shape to a contour of a drill hole of at least one predrilled element of the set of predrilled elements, and wherein prior to installation, the mandrel stem has, in the second sleeve, a mean diameter greater than a mean inside diameter of the first sleeve, the first sleeve deforming radially when, during installation, the part of the mandrel stem initially in the second sleeve penetrates into the first sleeve.