Bolt tension indicating means
OwnerEmanuel H. Trungoldinventor
Life of this patent
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Abstract
Improved flat annular washer for indicating tension on associated high tensile strength bolt. Washer bears against either bolt head or nut of given radius. Washer includes means for indicating stress on washer which visibly moves when stress on washer, which is related to tensile stress on bolt, reaches a preselected level.
Claims7
In a flat annular washer of the type suitable for use in cooperation with a nut or a bolt head having a given radius, the improvement which comprises means for indicating that the stress on said washer has reached a preselected level, said indicating means comprising an element joined to said washer by a portion of reduced cross section, at least a portion of said element extending a distance from the center of said washer not less than the radius of said nut or bolt head, said portion of reduced cross section having a predetermined stress failure which is reached when said washer achieves said preselected stress level, whereby when said washer is stressed to said preselected level, said portion of reduced cross section fails thereby effecting movement of said element relative to said washer.
Dependencies are inferred from the claim text.