Skf Industrial Trading & Development Company, B.v.

Alfred Hoffmann

Manfred Brandenstein

Armin Olschewski

Lothar Walter

Horst M Ernst

Martin B Verburgh

Toni Schulz

Hendrik Rekers

Carl Ullberg

A method and apparatus for manufacturing a multilayer powder blank, and the product of such manufacture which is suitable for subsequent extrusion. A hollow cylindrical container with its central axis oriented horizontally is rotated while powder is allowed to fall from a powder distribution tube in the center of the container downward onto the inner surface of the rotating wall, thereby forming successive layers of powder which are maintained in position by centrifugal forces acting thereon. The powder blank consisting of the multiple layers is removed from the container, isostatically compressed, and finally sintered, with fusion of the outer powder layers into a fused, water-tight coating.

Apparatus for making multilayer powder blanks

A ball bearing wherein each holder has only one oval-shaped race and a plate-like bearing surface member formed as a gutter-like circulating bearing surface conforming to the oval shape with four ball holders situated in the housing such that the bearing surface members run obliquely outward toward one another so that the straight race sections for the balls absorbing the load at one edge and the other straight race sections at the other edge run essentially along the ribs of two rectangular parallelpipeds having different cross-sectional dimensions.

Linear motion ball bearing

A ball bearing for linear movement on a shaft has a cage with oval guideways, and an outer sleeve surrounding the case. The cage has axially extending raceways for guiding loaded balls, the ends of the raceways joining radially outwardly directed transitions. The transitions are weakened by transversely extending grooves or slots, to provide resilience. The raceways may be axially extending radially inwardly directed ridges having central axially extending grooves, and the transitions may have V-shaped recesses with their apices at the ends of the grooves, to define two-point contact with the balls in the transition area of the bearing. A split sleeve may surround the outer sleeve for additional support.

Ball bearing for linear motion

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Bilthoven, Netherlands

Alfred Hoffmann