Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2000-03-15
2003-07-29
Gandhi, Jayprakash N. (Department: 2125)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S730000, C361S796000, C361S816000, C174S033000, C174S034000
Reexamination Certificate
active
06600660
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a plug-in unit storage rack-type apparatus and, more particularly, to a plug-in unit storage rack-type apparatus which dissipates heat of plug-in units stored in a rack-type case by air supply and exhaust by a fan.
In a conventional plug-in unit storage rack-type apparatus shown in
FIG. 7
, subracks
202
each storing plug-in units
203
from the front side, as shown in
FIG. 8A
, are inserted and fixed in a rack
201
as a case. This rack-type apparatus has a heat dissipation structure comprising fans
205
, air intake portion
204
, and exhaust portion
206
.
In this heat dissipation structure, the fans
205
draw air from the lower portion and blow it upward to forcibly cool the plug-in units
203
. Air supply and exhaust are done by the air intake portion
204
provided at the lower portion of the rack-type apparatus and the exhaust portion
206
provided at the upper portion of the rack-type apparatus, so an air path as shown in
FIG. 9
is formed.
If dust enters the rack
201
together with air, the dust sticks to the solder portion of a VLSI chip mounted in the plug-in unit
203
. The dust may absorb moisture and short-circuit the circuit. The conventional plug-in unit storage rack-type apparatus has a filter
207
at the air intake portion
204
, thereby preventing the fans
205
from drawing dust.
In the conventional rack-type apparatus, the plug-in units
203
are inserted/removed through the front side of the subrack
202
. To prevent interference between adjacent units, clearances as shown in
FIG. 8B
are ensured between the plug-in units
203
. Dust enters from the clearances due to the suction force of the fans
205
. In fact, a large amount of dust enters from the clearances on the front side of the plug-in units
203
.
SUMMARY OF THE INVENTION
It is therefore a principal object of the present invention to provide a plug-in unit storage rack-type apparatus capable of preventing dust from entering from clearances between plug-in units.
In order to achieve the above object, according to the present invention, there is provided a plug-in unit storage rack-type apparatus comprising a plurality of plug-in units, a subrack for storing, from a front side, the plurality of plug-in units at a pitch including a clearance for preventing interference to an adjacent unit, wherein the plug-in unit has microbristles for closing the clearance to the adjacent unit when stored in the subrack.
REFERENCES:
patent: 5522602 (1996-06-01), Kaplo et al.
patent: 5746326 (1998-05-01), Hong
patent: 5782546 (1998-07-01), Iwatare
patent: 5999403 (1999-12-01), Neustadt
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patent: 61-65797 (1986-05-01), None
patent: 1-124629 (1989-08-01), None
patent: 4-90186 (1992-03-01), None
patent: 4-28496 (1992-06-01), None
patent: 4-70791 (1992-06-01), None
patent: 4-70797 (1992-06-01), None
patent: 4-90186 (1992-08-01), None
patent: 6-252575 (1994-09-01), None
patent: 7-50495 (1995-02-01), None
patent: 8-199935 (1996-08-01), None
patent: 9-223887 (1997-08-01), None
patent: 9-283965 (1997-10-01), None
patent: 10-322059 (1998-12-01), None
Foley & Lardner
NEC Corporation
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