Noise- and vibration-damping elastic connector (51, 52, 53, 54, 55, 56, 57, 58, 59) designed for floating installation of an internal floor over a chassis floor, comprising: a) a lower part (31, 32, 33, 34, 35, 36, 37, 38, 39) having a first bearing wall (30,30') intended to be fastened to the floor of said chassis; b) an upper part (41, 42, 43, 44, 45, 46, 47, 48, 49), having a second bearing wall very similar to the first, intended to be fastened to said internal floor; c) an elastic mass positioned between said lower and upper parts, such that the lower part and upper part are able to move relative to each other without coming into contact; either of said parts separated by said elastic mass, i.e. the lower part or upper part, respectively, comprising two or more parts able to move relative to one another in a direction essentially perpendicular to said bearing walls, the first of which (311, 321, 331, 341, 351, 361, 471, 481, 491) being adjacent to said elastic mass and the second of which (312, 322, 332, 342, 352, 362, 472, 482, 492) being or comprising said first bearing wall or second bearing wall, respectively; said lower or upper part, respectively, being optionally equipped with a spacer (314, 324, 334, 354, 364, 474, 484, 494), that may be moved manually or by means of an actuator powered by an auxiliary power source, causing the first part to move relative to the second part, said lower or upper part, respectively, being optionally equipped with an immobilising device that immobilises said first part relative to said second part, such that said first bearing wall and said second bearing wall may be kept a constant distance apart, enabling a controlled difference in level to be maintained between said internal floor and the floor of said chassis, wherein said second bearing wall contains an orifice of sufficient diameter to afford access to said first bearing wall and, optionally, to said spacer or said actuator and/or said immobilising device. a) a lower part (31, 32, 33, 34, 35, 36, 37, 38, 39) having a first bearing wall (30,30') intended to be fastened to the floor of said chassis; b) an upper part (41, 42, 43, 44, 45, 46, 47, 48, 49), having a second bearing wall very similar to the first, intended to be fastened to said internal floor; c) an elastic mass positioned between said lower and upper parts, such that the lower part and upper part are able to move relative to each other without coming into contact; either of said parts separated by said elastic mass, i.e. the lower part or upper part, respectively, comprising two or more parts able to move relative to one another in a direction essentially perpendicular to said bearing walls, the first of which (311, 321, 331, 341, 351, 361, 471, 481, 491) being adjacent to said elastic mass and the second of which (312, 322, 332, 342, 352, 362, 472, 482, 492) being or comprising said first bearing wall or second bearing wall, respectively; said lower or upper part, respectively, being optionally equipped with a spacer (314, 324, 334, 354, 364, 474, 484, 494), that may be moved manually or by means of an actuator powered by an auxiliary power source, causing the first part to move relative to the second part, said lower or upper part, respectively, being optionally equipped with an immobilising device that immobilises said first part relative to said second part, such that said first bearing wall and said second bearing wall may be kept a constant distance apart, enabling a controlled difference in level to be maintained between said internal floor and the floor of said chassis, wherein said second bearing wall contains an orifice of sufficient diameter to afford access to said first bearing wall and, optionally, to said spacer or said actuator and/or said immobilising device.