Abstract: The invention relates to a method of notching a tube. The inventive method is characterised in that it comprises the to-and-fro movement of at least one pressure roller. During said movement, the aforementioned roller applies pressure locally to the wall of the tube (1) and plastically deforms same. The movement of the pressure roller is produced by a combination of at least two other movements, namely: a first essentially rectilinear to-and-fro movement, during which the roller rolls against the wall of the tube (1); and a second forward movement, the resultant of which is essentially perpendicular to the direction of the first movement. In this way, the tube (1) is plastically deformed in at least two movements of the pressure roller.

Abstract: A device for automatic indexed guidance of a moving part (53) guided about an axis of rotation (5) on a fixed part (1) that is fixed about said axis of rotation (5), the device comprising: a toothed element (40) mounted to rock about a rocking axis (41) substantially parallel to the axis of rotation (5); a ratchet (12) defining a plurality of abutments for the toothed element (40), said abutments being angularly disposed around the axis of rotation (5); and a cam path (10) for controlling the rocking movements of the toothed element (40) about its rocking axis (41) during rotation of the moving part; said device comprising a firs rigid one-piece fixed cheek-plate (1) provided with a plurality of staged surfaces defining: the ratchet (12); the cam path (10); and at least one bearing surface (13, 14) suitable for guiding a moving plate (57) in rotation about the axis of rotation (5), the moving plate supporting the rocking axis (41) of the toothed element (40).

Abstract: An automatic device (1) for index guiding a part (2) pivotably mounted about an axis (3) on a part (4) that is stationary relative to the axis (3). The device uses a mechanism (5) provided with a ratchet (6) that is pivotable between a number of positions including a fully engaged position, an adjustment position, and a fully spaced position. A toothed surface (6B) of the ratchet (6) is formed in an angular sector (6S) which, in the fully engaged position, is centered on the rotational axis (3) of the movable part and does not include a pivot axis (6A) of the ratchet (6).