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US 4,068,958 AGranted
Differentially bolted joint
AssigneeBBC Brown, Boveri & Company, Limited
InventorWolfgang Beckershoff
Life of this patent
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AssigneeBBC Brown, Boveri & Company, Limited
InventorWolfgang Beckershoff
Estimating the term…
A differentially threaded bolting arrangement for bolting two machine parts together includes one or more bolts the opposite ends of which are provided with threaded sections differing in pitch, a threaded hole in one of the machine parts into which the bolt end with the greater pitch is threaded, a bore through which the bolt passes and an adjacent hollow area in the other machine part in alignment with the threaded hole, and a nut having a cylindric configuration located in the hollow area and which is movable axially but is restrained against rotation. The bolt end having the smaller pitch is threaded through the nut and as the bolt is rotated, the nut is thus caused to move axially into a forced contact with the lower end of the hollow area accompanied by a drawing together of the two machine parts. When several bolts are utilized, all of the bores and hollow areas with the nuts therein can be located in one of the machine parts and all of the threaded holes can be located in the other machine part, or the bores, hollow areas, and nut assemblies and the threaded holes can be located alternately in the machine parts.
A differentially threaded bolting arrangement for securing two machine parts together comprising at least one threaded bolt, the opposite end portions of said bolt being provided respectively with threads differing in pitch, a threaded hole in a first one of said machine parts into which the end of said bolt having the greater pitch is threadable, a throughbore provided in a second one of said machine parts in alignment with the threaded hole in said first machine part and a hollow area forming an extension of said throughbore, said hollow area being accessible for effecting rotation of said bolt, a nut disposed in said hollow area, said nut being movable axially into contact with an end face of said hollow area but restrained against rotation about its axis by engagement with lateral faces of said hollow area, and the opposite end of said bolt having the smaller pitch being threadable into said nut whereby said nut is moved axially upon rotation of said bolt into contact with said end face of said hollow area accompanied by a drawing together of said first and second machine parts.
Dependencies are inferred from the claim text.