Patent ID: 6296429
Filing Date: 2001-10-02
Classification: F16B

Abstract:
A tension nut for use with an elongated, threaded rod having a first diameter to mix components of a resin grouting mix within a drill hole of a rock formation and thereafter advance the nut on the rod to produce a desired degree of tension in the rod between one end, anchored in the drill hole by the grouting mix and the other ends, extending outside the hole with the nut threaded thereon, said nut comprising:a) a body portion having an internally threaded bore with first and second ends and said first diameter for threaded engagement with said rod;b) a dome-shaped wall extending from an integral attachment with said body portion in the plane of said second end of said bore where said wall encircles said bore at a second diameter, greater than said first diameter, said wall extending to an annular lip defining an opening coaxial with said bore and axially spaced from said second end thereof, said opening having a third diameter, smaller than said first diameter; andc) a circular, metal disc having a predetermined thickness and a fourth diameter, larger than said first and smaller than said second diameter, positioned at said second end of said body portion and having a periphery surrounded by said wall and unattached to either of said wall and said body portion, and being shaped in the form of a washer having a central opening formed therethrough and which is of a fifth diameter that is smaller than said first diameter.