Patent ID: 6789990
Filing Date: 2004-09-14
Classification: F16B

Abstract:
A fastener device comprising a nut, a threaded member for receiving the nut, and visual indicator means for visually indicating if the nut has unintentionally become loose on the threaded member during use of the fastener device, the visual indicator means being such that it comprises an indicator member which is pivotally mounted on the nut, at least one recess in the threaded member, and biasing means which biases the indicator member into the recess and thereby to an indicating position in which the indicator member gives a visual indication that the nut has become loose, the biasing means being such that it firstly operates automatically consequent upon the nut becoming unintentionally loose and it secondly operates without a requirement for a tool for tightening and loosening the nut to be placed over the nut, and the indicator member being such that when it is in the recess it prevents further unintentional loosening of the nut on the threaded member.