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US 4,121,623 AGranted
Spacer for concentric tubes
AssigneeKabel-und Metallwerke Gutehoffnungshutte Aktiengesellschaft
InventorPeter Rhone
Life of this patent
Estimating the term…
Abstract
The spacer is helically wound on the inner one of two concentric tubes, and is constructed from plural elongated, generally flat members of different cross-section and profile for surface contours permitting only limited contact between adjacent members. Alternation between convex and concave surfaces prevents lateral shifting of the members off each other.
Claims4
A spacer for a coaxial tube system having an inner tube and an outer tube, the spacer being helically wound on the inner tube for holding the inner tube in and concentric to the outer tube, comprising:
- a plurality of superposed elongated members adjacent ones of which have different cross-sections defining pairs of engaging, differently contoured, non-mating surfaces which are shaped to permit a stable engagement between pairs with a minimum of contact therebetween, and wherein at least one of said pairs is formed by cross-sections defining a convex surface facing and in engagement with at least two spaced points of a concave surface.
Dependencies are inferred from the claim text.