Mannesmann Aktiengesellschaft

Mannesmann Aktiengellschaft

Salzgitter Mannesmann Precision Gmbh

Josef Siekmeyer

Friedrich Lenze

Erich Quadflieg

Gerd Pfeiffer

Gerhard Krug

Ulrich Hoffmann

Krug, Gerhard

Sven Herzig

Lothar See

Wolfgang Mussmann

An impact support for reinforcing a door of a motor vehicle, including a hollow profile part that is fastenable in the vehicle door. The hollow profile part having, at least in a central region thereof, a portion with a roughly oval cross section having a cross-sectional height that is greater than a cross-sectional depth. The hollow profile part is arranged in the motor vehicle door so that the depth lies parallel to an impact direction. The roughly oval cross section is formed by two straight sides which lie parallel at a distance from one another and are connected at their ends by a convex portion that has a radius that is always greater than half the distance between the two straight sides.

Impact support for a door of a motor vehicle

A screwed pipe joint with a bell for connecting two pipes of a drill pipe string. The screwed pipe joint includes, in opposed relation, a first pipe having a first tapered threaded end (10) and a second pipe having a second tapered threaded end (11), the first tapered pipe end and the second tapered pipe end having a different taper and pitch, and being shaped so that when the pipes are joined they are form-locked and having an axial clearance (23, 23') therebetween; and a bell having a first and second threaded section (7, 8) complementary to and for engagement with the first and second threaded pipe ends, and an unthreaded section (9) therebetween and a radially inward projecting shoulder (24) on the unthreaded section (9) of the bell (6) opposite the first pipe (2); the first and second pipe ends having respective annular recesses (14, 13) therein defining, with the unthreaded bell section (9), an annular space (15) therebetween; a sealing sleeve within the annular space (15) having an outside diameter smaller than the inside diameter of the unthreaded section (9) of the bell (6) and being axially fixed in the recess (14) of the first pipe end.

Screwed pipe joint

A drill pipe coupling includes a coupling member (2) having an unthreaded central section (13) with a cylindrical bore (26) therein and an outer shoulder (11,12) on each side thereof. Adjoining the shoulders are respective conical external threads for threading into an internal correspondingly threaded upset head section of a drill pipe formed as a bell elements and including end surfaces (9,10). The drill pipe has an undeformed cylindrical bore (14) connected to the threaded upset head. The drill pipe end surfaces (9,10) sealingly abut the outer shoulders (11,12) of the central section (13) when the pipes are joined together. The drill pipe has an intermediate section (16) adjoining the cylindrical bore (14) and has an inside diameter which decreases in the direction toward the threaded section (5, 6). A cylindrical bore section (18) adjacent the intermediate section (16) extends to the threaded section (5,6) and a rounded transition is located between the cylindrical bore (14) of the undeformed pipe (8) and the intermediate section (16). The drill pipe has an outer shoulder (33) opposite the cylindrical bore section (18) and the outside diameter of the drill pipe in the upset region (23) of the shoulder (33) is identical to or greater than the outside diameter (21) of the undeformed pipe (8) and the length of the region (23) is greater than the length of the intermediate section (16).

Drill pipe coupling

Growing community of inventors

Ratingen, Germany

Josef Siekmeyer