Abstract: A convex type bottom with a bearing rim for bottles for industrial gases, obtained by hot forging a steel billet, has the lower outer surface consisting of a central circular flat area (2), a first frustoconical annular area adjacent the central area (2), inclined upwards, a second frustoconical annular area adjacent the first frustoconical annular area, inclined downwards, and a subvertical frustoconical area (6) radiused, on the one side, to the second frustoconical annular area and, on the other side, to the flat surface (7) of the bearing rim (8). Provided on the inclined frustoconical annular areas are corrugations (3,4,5). Such a configuration of the bottom permits the defects to be eliminated due to creeping of the material during forging.

Abstract: In an oil seal for lubricated track chain joints, particularly for track-type vehicles, of the type with a flanged primary ring of a flexible material and a secondary ring of a resilient material, the annular portion (6) of the flanged primary ring (5) carries a metal ring (7) embedded in it.

Abstract: A safety device for a track stretcher of a tracked vehicle is disclosed. The safety device includes two half rings (14,15) held in a groove (16) of the tension rod (17) of the tracked vehicle by an elastic ring (20). The safety device prevents separation of the tension rod (17) from a support (2) connected to the roller wheel (1) upon failure of the primary thrust controlling stop device which includes a nut (22) screwed on the threaded end (21) of the tension rod (17).