Abstract: A support system is for a longitudinal mining gallery or the like, wherein the gallery is defined by at least a circumferentially extending rock eruption. The support system includes an inner shell including a plurality of wall segments and a plurality of flexible elements. An outer shell of construction material includes a plurality of outer segments between the inner shell and the rock eruption. Each of the wall segments extends circumferentially and includes opposite ends. Each of the wall segments is adjacent a corresponding outer segment of the construction material. At least one of the flexible elements is disposed between adjacent ends of circumferentially adjacent wall segments. The inner shell and the outer shell are circumferentially flexible. The invention also includes a method of supporting the longitudinal mining gallery or the like.

Abstract: This invention relates to under carriages for supporting and displacing heavyweight sliding doors. Two spaced carriages 10 and 11 are arranged to run on a trackrail 6 which is cemented into the ground. Each of the carriages comprises two track wheels 19 and 20 situated one behind another and these track wheels each have flanges 21 at each side to enflank the head 15 of the track. The track wheels are also joined to a rigid beam which includes a spheroidal seat bearing 25 into which engages a calotte 26 having a plane upper surface which fits into a matching recess in a door frame 27 to carry the weight of the door, (FIG. 3).