Patent ID: 7216937

Claim:
A seatframe for an automotive seat, having a top-rail, and having a headrest-mounting-tube secured to the top-rail, wherein: the headrest-mounting-tube is of metal; the headrest-mounting-tube has an upper-portion, which protrudes from the top-rail and which terminates in an open top-end; the upper-portion is of generally cylindrical configuration, except that the upper-portion has been formed, at the top-end thereof, with a keyway-pocket; the keyway-pocket comprises a local distortion of the metal of the headrest-mounting-tube, the metal having yielded, and having been distorted radially outwards from the cylindrical configuration of the upper-portion, to form a pocket; the nature of the said local distortion is such that, over at least most of the depth of the keyway-pocket, the metal forming the keyway-pocket is unbroken; the headrest-mounting-tube is suitable for receiving therein a headrest-post, being a headrest-post having the following characteristics: (a) that the headrest-post includes a rod; (b) that the dimensions of the rod are such that the rod can enter the top-end of the upper-portion of the headrest-mounting-tube; (c) that the rod is of generally cylindrical configuration except that the rod includes a radially-protruding key, which protrudes outwards from the generally cylindrical configuration of the rod; (d) that the key can fit into the keyway-pocket; (e) that the rod can enter the headrest-mounting-tube through the top-end of the upper-portion, and can pass down the headrest-mounting-tube to a depth D if the rod is so orientated that the key can enter the keyway-pocket, but the rod can pass down only to a lesser depth unless the rod is so orientated that the key can enter the keyway-pocket; the structure of the headrest-mounting-tube is such that the said headrest-post can enter the headrest-mounting-tube through the top-end of the upper-portion, and can pass down to the depth D if the rod is so orientated that the key can enter the keyway-pocket, but the rod can pass down only to a lesser depth unless the rod is so orientated that the key can enter the keyway-pocket.