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. 28, 1992
Filed:
Sep. 27, 1990
Carlo Zingrini, Vimercate, IT;
Maurizio Oreglio, Bellinzago Lombardo, IT;
Domenico Ronchi, Cambiago, IT;
Telettra S.p.A., , IT;
Abstract
A subrack for supporting cards and printed circuit boards (PSC) for telecommunication equipment which allows complete use of the space available for these cards and circuit boards, while meeting the DIN 41494-IEC 297 standard, with a pitch at least 4 times lower than the pitch required by this standard. The subrack includes undrilled crosspieces, provided only with grooves, one of which is associated with a positioning toothing with teeth forming a rack, having a pitch equal to half of the pitch of drillings of conventional crosspieces. The teeth are inserted into seats machined into the guide of the printed circuit board, each seat being offset by a quarter of the pitch required by the standard. Therefore, by successive turning the boardguide by 180.degree., a series of real pitches is obtained which is a quarter of the minimum pitch required by the standard.