Patent ID: 8939690
Filing Date: 2015-01-27
Classification: F16B

Abstract:
1. An attachment device changeable between an unengaged state and an engaged state, comprising: a nut member comprising blocks having abutment faces defining a polygonal outline with side faces, the nut member extending along an axis and having an axial thread-engaging bore; a flange member extending transversely to the axis and having an opening, the flange member being spaced axially from the nut member in the unengaged state; and tabs connecting the flange member to the nut member in both the unengaged state and the engaged state, each tab extending alongside an abutment face on a side face and having a first end connected to the nut member and a second end connected to the flange member; wherein the tabs are configured to bend outwardly when the nut member is moved axially toward the flange member to change the attachment device from the unengaged state to the engaged state such that, when the attachment device in the unengaged state is inserted into a hole in a plate to be fastened, with the flange member abutting the plate at one side of the hole and the nut member extending through the hole, tightening of a threaded fastener inserted into the bore of the nut member causes axial movement of the nut member toward the flange member, thereby decreasing the distance between the first end and the second end of each tab during the change from the unengaged state to the engaged state and causing outward bending of the tabs so that the tabs engage an opposite side of the hole in the plate in the engaged state, wherein the nut member abuts the flange member in the engaged state.