Abstract An improved fastening device and a method of fastening a plurality of members together. The fastening device includes a headed pin which has a threaded shank portion, the latter having a polygonal recess formed at the outer end thereof. The pin is seated with its head against one surface of the members to be fastened together and at least a part of the threaded shank portion extends beyond the opposite surface of the members to be fastened together. A nut is then threaded onto the threaded shank portion with sufficient torque to develop a preloading stress in the pin. Finally, a heating element is inserted into the polygonal recess to thereby cause plastic deformation of the threaded shank portion to lock the shank portion to the nut and also to provide an increased tension in the pin.
The method of fastening together a plurality of members having aligned coaxial apertures which comprises providing a headed pin having a threaded shank portion with a polygonal recess formed therein, seating the head of the pin against one surface of the members to be fastened together, the pin being of sufficient length so that the threaded shank portion extends through said apertures and beyond the opposite surface of the members to be fastened together, threading a nut onto said threaded shank portion with sufficient torque to develop a preloading stress in said pin, and thereafter inserting a heating element into said polygonal recess to thereby cause radially outward plastic deformation of the threaded shank portion from which results increased tension in said pin.
Claim 2
Independent Claim
123 words
The method of fastening together a plurality of members having aligned coaxial apertures which comprises providing a headed pin having a threaded shank portion with a polygonal recess formed therein, seating the head of the pin against one surface of the members to be fastened together, the pin being of sufficient length so that the threaded shank portion extends through said apertures and beyond the opposite surface of the members to be fastened together, threading a nut onto said threaded shank portion with sufficient torque to develop a preloading stress in said pin, and thereafter inserting a heating element into said polygonal recess to thereby cause radially outward plastic deformation of the threaded shank portion from which results increased tension in said pin.
Claim 3
Dependent Claim
13 words
The method of claim 1 in which said heating element is an electrode.
Claim 4
Dependent Claim
15 words
The method of claim 1 in which said heating element has a generally frusto-conical configuration.