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:
Jun. 06, 1995
Filed:
Aug. 05, 1994
Philippe Le Gauyer, Paris, FR;
Valeo Thermique Moteur, Le Mesnil-Saint-Denis, FR;
Abstract
A heat exchanger has a manifold with a tubular wall. A through aperture is formed in the tubular wall by means of a punch having a cylindrical outer surface terminating in a cutting edge. The punch is moved in a forward stroke in the direction of the generatrices of its cylindrical surface so that the cutting edge comes into contact with the outside of the wall and then passes through its thickness so as to form the aperture. In order to eliminate a sharp edge causing possible damage to a tube subsequently inserted in the aperture, and to ensure correct centring of such a tube, the cylindrical surface of the punch is joined, at its end opposite to the cutting edge and over at least part of its perimeter, to a surface portion of the punch which is inclined outwardly from the cylindrical surface. At the end of the forward stroke of the punch, the inclined surface portion deforms the tubular wall so as to form a flared portion of the aperture.