Abstract: The body of the joint (2) is pivotally seated on the central pin (1), onto which is also fitted the wheel (3) with a screw (4) and internal toothing (5), while in the body of the joint (2) is in the guide (8) a movably seated sliding block (7), into which is inserted the arresting pin (6), and on the body of the joint (2) is pivotally fitted the collar of the joint (9), which is pressed by a lever (10) with eccentric (11) over the casing (12), disc springs (13) and radial toothing (14) to the body of the joint (2), and it is connected by the central screw (15) to the sliding block (7), between which and the body of the joint (2) is inserted the internal expanding spring (16), while between the body of the joint (2) and the collar of the body (9) is inserted the external expanding spring (17), and the body of the joint (2) is covered with capping (18).

Abstract: An examination chair for gynecological and urological examinations, comprising a chair part (14) with a seat (22) and a backrest (24), and a support column (12) that has a column head which can be adjusted heightwise through an actuator (20), on which the chair section is mounted, the backrest (24) being pivotally mounted on the column head (18) for movement about a horizontal pivot axis (28) and being so pivotable by a drive mechanism (30), the seat (22) being pivotally mounted on the backrest (24) for movement about a second pivot axis (36) parallel to the axis (28) and also connected to the backrest (24) by a four-corner linkage (38) that includes both pivot axes (28,36), a link axis (40) fixed to the seat, and a free link axis (42), the link (46) of the linkage (38) connecting the first pivot axis (28) to the free axis (42) being a first lever arm of a two-armed control lever (48) and cooperating with a stop (54) secured to the column to determine the fundamental position of the seat (22), the second leve