F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
F16B 31/02 (2006.01) G01L 5/24 (2006.01)
Patent
CA 2128873
2128873 9316293 PCTABS00025 A load-indicating fastener, such as a bolt (10), has a bore (18) which extends from an end face (16) of the bolt and which can receive a gauge pin (30). The assembly of the bolt (10) and gauge pin (30) is pre-set by applying a predetermined tensile load to the bolt, inserting the gauge pin (30) in the bore (18) and rotating it until the end (34) of the pin engages the inner end of the bore (18). A mark (28) is then made on the end face (16) of the bolt (10) at the position of the pointer (40). The gauge pin (30) is then withdrawn from the bore (18) and the tensile loading released. The bolt (10) is then shipped to the user together with the gauge pin (30). In use of the bolt, the gauge pin (30) is reinserted into the bore (18) and screwed down until the end of the pin engages the inner end of the bore. As the bolt is tightened, causing elongation of the shank (12) of the bolt (10) and therefore of the bore (18), the user can check the loading on the bolt by periodically rotating the gauge pin (30), to maintain contact between the end of the pin and the inner end of the bore, until the pointer (40) reaches the mark (28) on the end face (16) of the bolt, indicating that the predetermined loading has been reached.
Fetherstonhaugh & Co.
Rotabolt Limited
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