The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 20, 1993
Filed:
Jul. 02, 1991
Enno Wieting, Ratingen, DE;
Joachim Fischer, Mulheim, DE;
Mannesmann Aktiengesellschaft, Dusseldorf, DE;
Abstract
A deformable, reinforced tubular door member for absorbing energy occasioned by an impact force exerted thereupon is disclosed, having a deformable tube having an open space therewithin, and a spiralled stiffening element positioned within the open space of the deformable tube and having a plurality of surface elements which are arranged such that when the impact force is exerted upon the tubular member, the elements exert a resisting force against the tubular member. In one embodiment, the stiffening element is a coiled or spiral spring. In another embodiment, the stiffening element is a strip which is twisted about its lengthwise axis so that the surface elements are arranged in a double helix. In a still further embodiment, the strip is twisted in order that it have one twist per centimeter.