Member of a transfer device for moving appliances that has a front part and a rear part, and a rear longitudinal slide rail, wherein the two slide rails (5, 6) have an approximately U-shaped cross-section, they are nested into each other with one end offset in their longitudinal direction and wherein a roller device (12, 12') is arranged in each slide rail at the opposite end, where the closed upper areas of the two rails are pushed into each other to form a transport surface for the movement of the appliances to be moved and where the opposite open areas of the rails face the ground during the movement, where a front roller device on the front longitudinal slide rail and a rear roller device on the rear longitudinal slide bar are arranged where one or more rollers (7, 8, 9, 10) are arranged in each of the roller device, and where each roller (7, 8, 9, 10) comprises a pin (7', 8', 9', 10'), where the rollers are arranged in the respective roller device in a way that their pins are perpendicular to the longitudinal direction and parallel to the upper area of the slide rail in which the respective roller device is located; characterised in that the front roller device has on the front side a U-shaped element which is arranged so as to be displaceable in the longitudinal direction of the member and which has two parallel arms and has a grip member connecting the two parallel arms at one of their ends, where each of the parallel arms has successive portions having horizontal surfaces disposed closer to the grip member with connected inclined surfaces, which are closer to the free end of each arm and are inclined from the side of the horizontal surfaces towards the free ends of the arms, and where the arms are positioned between the top of the slide rail and the pins (7', 8', 9', 10') and are pushed into the front roller device; where the one of the multiple rollers (9, 10) of the rear roller device is arranged so as to be in permanent contact with the ground and to be able to roll on it, and one of the multiple rollers (7, 8) of the front roller device is in the receiving areas (18, 18', 19, 19') can be displaced vertically with respect to the longitudinal direction of the member, where, according to each pushing in position of the U-shaped element, its arms are in contact with the pins, so that the roller(s) (7, 8) of the front roller device, when the pins (7', 8') rest on the inclined surfaces, allow the member to roll, whereas when the pins (7', 8') rest on the horizontal surfaces of the arms, the roller(s) (7, 8) rest freely in their receiving zones (18, 18', 19, 19') and thus immobilize the member, and where the member is raised in the front region, when the U-shaped element is pushed into the roller device so that the pins rest on the inclined surfaces of the arms and so that the member is lowered, when the U-shaped element is pushed into the roller device, so that the pins rest on the horizontal surfaces of the arms. where the closed upper areas of the two rails are pushed into each other to form a transport surface for the movement of the appliances to be moved and where the opposite open areas of the rails face the ground during the movement, where a front roller device on the front longitudinal slide rail and a rear roller device on the rear longitudinal slide bar are arranged where one or more rollers (7, 8, 9, 10) are arranged in each of the roller device, and where each roller (7, 8, 9, 10) comprises a pin (7', 8', 9', 10'), where the rollers are arranged in the respective roller device in a way that their pins are perpendicular to the longitudinal direction and parallel to the upper area of the slide rail in which the respective roller device is located; characterised in that the front roller device has on the front side a U-shaped element which is arranged so as to be displaceable in the longitudinal direction of the member and which has two parallel arms and has a grip member connecting the two parallel arms at one of their ends, where each of the parallel arms has successive portions having horizontal surfaces disposed closer to the grip member with connected inclined surfaces, which are closer to the free end of each arm and are inclined from the side of the horizontal surfaces towards the free ends of the arms, and where the arms are positioned between the top of the slide rail and the pins (7', 8', 9', 10') and are pushed into the front roller device; where the one of the multiple rollers (9, 10) of the rear roller device is arranged so as to be in permanent contact with the ground and to be able to roll on it, and one of the multiple rollers (7, 8) of the front roller device is in the receiving areas (18, 18', 19, 19') can be displaced vertically with respect to the longitudinal direction of the member, where, according to each pushing in position of the U-shaped element, its arms are in contact with the pins, so that the roller(s) (7, 8) of the front roller device, when the pins (7', 8') rest on the inclined surfaces, allow the member to roll, whereas when the pins (7', 8') rest on the horizontal surfaces of the arms, the roller(s) (7, 8) rest freely in their receiving zones (18, 18', 19, 19') and thus immobilize the member, and where the member is raised in the front region, when the U-shaped element is pushed into the roller device so that the pins rest on the inclined surfaces of the arms and so that the member is lowered, when the U-shaped element is pushed into the roller device, so that the pins rest on the horizontal surfaces of the arms.