EP0425778A2
Expired / Lapsed
EP
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Subrack for telecommunication equipments
Assignee: Alcatel Lucent Italia SpA
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Filing: 1990-08-14
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Granted: —
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Expires: 2010-08-14
Abstract
Abstract The subrack accoridng to the invention, supporting cards and printed circuit boards (PCS) for telecommunication equipments, allows to use in a complete manner the space at disposal for these circuits respecting the Standars DIN 41494-IEC 297 and with minimum pitch (P'min) by least 4 times lower than the pitch (Pmin) foreseen by this standard. It includes undrilled crosspieces, but provided only with grooves, one of which being associated to a positioning toothing with teeth forming a rack, having a pitch (P'min) equal to the half of the pitch of drillings of conventional crosspieces. The teeth must be housed into seats machined into the guide of PCS, each seat being offset by a quarter of Pitch P'min, therefore, each time turning the boardguide by 180°, the eccentricity of the seat allows to obtain a series of real pitches multiple by a quarter of Pmin foreseen by the standard.
Inventors
- 👤 Carlo Zingrini
- 👤 Maurizio Oreglio
- 👤 Domenico Ronchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 03:39
CPC Classifications
H; H05; H05K; H05K7/00; H05K7/14; H05K7/1422; H05K7/1424; H05K7/1425
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
114 words
1) A subrack for housing electronic circuits, in particular in the form of cards or printed circuit boards (PCS) for telecommunication equipments, formed by four crosspieces supplied with means offset with a certain pitch along the axle of each crosspiece, for being engaged with corresponding insertion means provided onto the bottom of the boardguides, each crosspiece being supplied with groove for being fixed to the sides and with a groove for the snap-insertion with said boardguides, characterized in that each crosspiece is associated to a groove, in which it is present a positioner having teeth projecting up-ward, foreseen for being housed in corresponding seats projecting towards the bottom starting from the bottom of boardguides.
Claim 2
Dependent Claim
114 words
1) A subrack for housing electronic circuits, in particular in the form of cards or printed circuit boards (PCS) for telecommunication equipments, formed by four crosspieces supplied with means offset with a certain pitch along the axle of each crosspiece, for being engaged with corresponding insertion means provided onto the bottom of the boardguides, each crosspiece being supplied with groove for being fixed to the sides and with a groove for the snap-insertion with said boardguides, characterized in that each crosspiece is associated to a groove, in which it is present a positioner having teeth projecting up-ward, foreseen for being housed in corresponding seats projecting towards the bottom starting from the bottom of boardguides.
Claim 3
Dependent Claim
35 words
2) A subrack according to claim 1. characterized in that the pitch (P) of the teeth is equal to an half of the minimum conventional pitch (Pmin) foreseen by the standard DIN 41494 IEC 297.
Claim 4
Dependent Claim
26 words
3) A subrack according to claims 1 and 2, characterized in that the new minimum pitch (P'min) is at least 1/4 of said minimum conventional pitch.
Claim 5
Dependent Claim
46 words
4) A subrack according to preceding claims, characterized in that the seats of the boardguides to be engaged with the positioner teeth are formed by at least two lateral walls spaced at least as the thickness of the tooth and with a misalignment or eccentricity (DIS).
Claim 6
Dependent Claim
29 words
5) A subrack according to claim 4, characterized in that the misalignment DIS is equal to a fourth of the pitch (P) of teeth (DEi) of the positioner (POS).
Claim 7
Dependent Claim
26 words
6) A subrack according to claim 5. characterized in that, turning the boardguides by 180°, said misalignment can be added or subtracted from the housing pitch.
Claim 8
Dependent Claim
52 words
7) A subrack according to preceding claims, characterized in that, being the minimum conventional pitch according to standard DIN 41494-IEC 297 equal to 5.08 mm (1/5 pitch), the pitch (P) of the toothing onto the positioner POS is P'min/2 = 2.54 and the new minimum pitch is at least P'min/4 = 1.27.
Claim 9
Dependent Claim
34 words
8) A subrack according to claims 5 and 7, characterized in that the misalignment DIS is made equal to a fourth of the pitch of toothing, that is P/4= 2.54 = 0.635 (1/40 inch).
Claim 10
Dependent Claim
53 words
9) A subrack according to claims 7 and 8 characterized in that the play of the misalignment DIS of the seats SEi and the rotation by 180° of the boardguides allows to obtain three real housing pitches (PE1, PE2, PE3), that in the specific case assume the values of 24.13, 26.67, respectively 25.4.
Claim 11
Dependent Claim
32 words
10) A subrack according to claim 1, characterized in that the positioner (POS) is a preformed piece, made of plastic material, that is inserted into the proper groove of the crosspiece SPOS.
Claim 12
Dependent Claim
27 words
11) A subrack according to claim 1 characterized in that the positioner (POS) is otbained onto the crosspiece and forms a sole body with the groove SPOS.
References Cited (Backward Citations)
No citation records indexed.
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