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:
Feb. 06, 1990
Filed:
Jan. 25, 1989
Lothar Brehm, Frankfurt, DE;
Metallgesellschaft Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
A piston is provided which serves to produce a pressure surge in a wind tunnel. Under the action of a gas pressure of at least 20 bars the piston is propelled in a first passage from an initial position to a target surface. Under the compression produced by the approaching piston, a diaphragm disposed at the end of the first passage is torn. The resulting pressure surge is transmitted in a second passage, which is filled with a testing gas, to a thin sheet. That thin sheet is torn so that the testing gas can enter a testing chamber as a supersonic shock wave. The piston is provided at its rear end with a locking extension, which cooperates with a stationary holder when the piston is in its initial position.