Creep limiting direct tension indicating washer
View Patent ↗A direct tension indicating washer includes a body having a first surface having a protuberance formed thereon; the body having a second surface having an indentation formed opposite the protuberance; and an insert positioned internal to the body, the body and the insert being made from materials of different hardness.
1. A direct tension indicating washer comprising:
a body having a first surface having a protuberance formed thereon;
the body having a second surface having an indentation formed opposite the protuberance;
an insert positioned internal to the body, the body and the insert being made from materials of different hardness;
an indicating material positioned in the indention; and
a channel leading from the indentation to an outer diameter of the body.
2. The direct tension indicating washer of claim 1 wherein:
the insert is made from a first material and the body is made from a second material, the first material being harder than the second material.
3. The direct tension indicating washer of claim 1 wherein:
the insert is electrically conductive and the body is not electrically conductive.
4. The direct tension indicating washer of claim 1 wherein:
the first material is metal and the second material is plastic.
5. The direct tension indicating washer of claim 1 wherein:
the insert is a ring positioned within the body.
6. The direct tension indicating washer of claim 1 wherein:
the insert is a plurality of inserts positioned throughout the body.
7. The direct tension indicating washer of claim 6 wherein:
the inserts are positioned within the body at equal angles to each other.
8. The direct tension indicating washer of claim 1 wherein:
the insert is the same thickness as the body.
9. The direct tension indicating washer of claim 1 wherein:
the body is formed using a rapid prototyping technique.
10. A direct tension indicating washer comprising:
a body having a first surface having a protuberance formed thereon;
the body having a second surface having an indentation formed opposite the protuberance; and
an insert positioned internal to the body, the body and the insert being made from materials of different hardness;
wherein the insert includes an emitter to emit a shut off signal to a controller.
11. The direct tension indicating washer of claim 10 wherein:
the emitter emits the shut off signal when each end of the insert is in contact with a metal surface.