Sheet Metal Aluminum Generic Book
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Feenstra, D: AUTHOR [+9]
Disclosed is a design concept for a logic book that allows the mounting of multiple-size logic cards with different-size logic connectors (in different locations on those cards) in a multiplicity of positions within a single set of logic book covers. By moving toward this generic concept, part numbers and part and tooling costs are significantly reduced, and the quality of the overall assembly is enhanced.
Sheet Metal Aluminum Generic Book
a design concept for a logic book that
allows the mounting of multiple-size logic cards with different-size
logic connectors (in different locations on those cards) in a
multiplicity of positions within a single set of logic book covers.
By moving toward this generic concept, part numbers and part and
tooling costs are significantly reduced, and the quality of the
overall assembly is enhanced.
details the design that is replaced by the generic book
cover concept. Logic book 1 is made of two die cast alloy covers 2
and 3 and contains and mounts logic card 4. Logic card 4 is equipped
with connector or connectors 5, which make electrical connection to
the backplane card in the logic cage to which the logic book is
installed and plugged, and a tailstock bracket 6 which provides for
logic card support and, coincidentally, serves to mount and strain
relieve any user connectors at that end of logic card 4. Logic card
4 is located in cover set 2,3 by virtue of diamond pin 7--integral
with cover 3--and mating card 4 hole 8; these features provide
location in direction 9, as shown by the arrow. Tailstock bracket 6
mounted on card 4 fits in integrally formed cover 2,3 grooves 10 and
provides location and restraint in the direction shown by arrow 11.
Location in the third direction 12 is provided by an integrally
formed pad 13 on diamond pin 7, ledges 15 on cover 3 and, at the
end of card 4, by the fastened connection between card 4 and
tailstock bracket 6. Completing the assembly and providing card
hold-down capability are spring clips 14 mounted to cover 2 which
press card 4 down onto pad 13 and ledges 15. It is evident that this
design is capable of mounting exactly one card 4 size in exactly one
location and that significant changes to covers 2,3 are required if
another card 4 size or location is needed.
concept shown in Fig. 2 for a generic logic book
replaces the design of Fig. 1. Overall card location, within covers
20,21 of the figure, is obtained by interposing a low-cost,
non-complex plastic adapter 22, shown in detail in Fig. 2a, between
card 4 and covers 20,21. Adapter 22 snap-fits to card 4 and locates
by virtue of a closely dimensioned pin 23 and card 4 hole 24.
Adapter 22 is rotated until detent 50 snaps into card 4 hole 51,
locking it in place. Molded tenon 25 on the bottom of adapter 22 is
closely dimensioned and locates in counterbore 26 that is integral to
cover 21, providing proper positioning of card 4 in the directions
shown by arrows 27,28. The top of adapter 22 contains integrally
molded spring features 29 which contact cover 20 and press card 4 in
direction 30, completing accurate card location. Card 4 tailstock
bracket 6 locates in integrally formed cover grooves 31 similar to
those of the original design and accomplishes strain relief functions
for any user-mounted connectors and supports that end of card 4. A...