F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/5, 116/66
F16B 31/02 (2006.01)
Patent
CA 1078673
ABSTRACT OF THE DISCLOSURE A tension indicator for use with fasteners such as a cooperating nut and bolt. The tension indicator comprises a pair of washers for placing on the shank of the bolt between the bolthead or nut and the workpiece that is to be secured by the fastener. Each washer includes a concave central portion having a hole therethrough for receiving the shank of the bolt with the concave surfaces of the washers racing in opposite directions in the assembled condition. Each washer further includes at least one finger extending outwardly from the central portion. Prior to the application of the load on the tension indicator by either the fastener or the workpiece, the outermost end faces of the coacting fingers will be at equal and opposite angles with respect to each other. After a predetermined load has been applied to the fastener, the outermost end faces of the coacting fingers will be aligned with each other to thereby visually indicate that the desired load has been achieved. Preferably, each washer has a plurality of fingers, each washer including first and second spaced apart and diametrically opposed pairs of fingers as well as one pair of diametrically opposed single fingers that are interdigitated with the two pairs of spaced apart fingers in the assembled condition. In one embodiment, the desired load is achieved when the washers are fully compressed, while in a second embodiment the desired load is achieved before full compression of the washers is achieved. If desired, teeth may be formed on the central portion of each washer about the hole therethrough so that the washer acts as a lock washer.
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