Load indicating
AssigneeRotabolt Limited
InventorBrian Walton
Life of this patent
Estimating the term…
Abstract
For indicating when the tension in a bolt reaches a predetermined value, there is provided an electrical contact (24) which is held in a position adjacent to an axially facing surface (20) of the bolt and in a fixed position relative to a remote part of the bolt. Tightening of the bolt reduces the clearance between the contact and the surface of the bolt. When the clearance is eliminated, a bulb (27) is illuminated.
Claims6
A hollow member having first and second electrically conductive elements which are anchored to or fixed with respect to respective portions of the member, which portions undergo relative movement when the member is stressed, characterised in that, when the member is subjected to a first load, the elements are in electrically conductive contact with each other at a position inside the hollow member, in that when the member is subjected to a second load, the elements are out of electrically conductive contact with each other, and the first element is electrically insulated from the hollow member and in that the first element is carried by a first carrier which is fixed with respect to the corresponding portion of the hollow member and is positioned within the hollow member.
Dependencies are inferred from the claim text.