Concentric tubular elements

Details Concentric tubular elements Concentric tubular elements

1987-03-31

1988-08-09

Epstein, Henry F.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

301 63PW, B60B 502

Patent

active

047627395

ABSTRACT:
A structural element made of injection moldable or castable polymeric material comprising an external tubular element, an inner tubular element essentially concentric with the latter and integrally connected with the latter by ribs arranged in planes extending essentially in the direction of the longitudinal axis of the structural element, characterized in that the ribs (3) have a radius (R.sub.1) verging into the bore wall (7) of the external tubular element (1) which is considerably less than the radius of curvature (R.sub.2) of the bore wall (7) section connecting the radii (R.sub.1) of two adjacent ribs (3), the radius of curvature (R.sub.2) being smaller than the radius (R.sub.3) of the circle circumscribing the bore wall (7).

REFERENCES:
patent: 4164251 (1979-08-01), Chung
Motor Wheel, "Complete Parts List for 1971".

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