Patent ID: 7992796

Claim:
A base plate for fastening a rail to a fixed bottom support, comprising: a through-opening which runs from an upper side of the base plate to an underside of the base plate, wherein the through-opening is adapted to insert a clamping bolt having a polygonal head with side-faces therethrough, from the underside of the base plate; and a receptacle formed or moulded in the underside of the base plate around the perimeter of the through-opening, wherein, in a fully installed state, the head of the clamping bolt is seated in the receptacle, wherein the receptacle comprises a circumferential side wall having contact faces formed thereon and associated with each side-face of the bolt head, wherein each contact face extends partially the length of an associated bolt head side-face, such that in the installed state, the contact faces provide planar support against the bolt head side-faces, wherein, the contact faces of the circumferential wall are arranged to be spaced apart from one another, such that first recesses are formed or moulded in the circumferential wall of the receptacle, between directly adjacent contact faces, and wherein, at a first recess, there is no contact between the bolt head and the circumferential wall of the receptacle, in the fully installed state.