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. 01, 1986
Filed:
Aug. 21, 1984
Erich Alker, Bergisch-Gladbach, DE;
Dynamit Nobel Aktiengesellschaft, Troisdorf, DE;
Abstract
A cap-shaped cover for hollow-charge mines is adapted to form a hollow cavity adjacent to a portion of the mine. The cover, in its initial position, is in a folded, collapsed, introverted or the like closed condition and in its operational position, the cover is extended by a compression spring to assume a shell-like, hemispherical, or open configuration that defines the cavity. The cover includes at least one ventilating device for venting of the closed cover, a flexible body portion and the compression spring. The spring is formed of at least two separate, identical parts. These parts are arranged in the cover in such a way that the compression spring is symmetrical in all vertical section planes. The lead angle of a central turn section of each individual part of the compression spring, in the operational position of the compression spring, is 15.degree.-45.degree., at least in the zone adjoining an outer turn section. Preferably, an inner turn section of the compression spring is held in a continuous groove of the covering member.