Fixing device for fixing a seat to a vehicle floor, and a seat and a vehicle including such a fixing device

A fixing device for fixing a seat to a floor of a vehicle, the seat including a seat proper which extends between a front end and a rear end, said device comprising:

• a base serving to support the seat proper;
• and
• a rear coupling and a front coupling that are secured to the base, the front coupling comprising an anchoring fork having an open recess serving to co-operate with a horizontal rod secured to the floor to allow the seat to be pivoted between an in-use position in which the rear coupling co-operates with fixing means on the floor to hold the seat proper substantially horizontal, and a tilted-forwards position in which the rear coupling no longer co-operates with the fixing means on the floor so as to enable the seat proper to be inclined relative to the horizontal;
• wherein the anchoring fork is provided with a finger which projects substantially forwards when the seat is in the in-use position, and the device further comprises an elastically deformable blade that is secured to the floor and that is provided with a through opening, and wherein the elastically deformable blade is disposed in register with the finger on the anchoring fork so as to make it possible firstly for the finger to push away said elastically deformable blade by deforming it, while the seat proper is pivoting from its in-use position to its tilted-forwards position, and secondly, when the seat proper is in its tilted-forwards position, for the finger to engage in the opening of the blade by said blade returning resiliently, so as to lock the seat proper to prevent it from pivoting from its tilted-forwards position to its in-use position.