Pumps – Motor driven – Including means for facilitating assembly or disassembly of...
Reexamination Certificate
1999-08-04
2001-02-06
Freay, Charles G. (Department: 3746)
Pumps
Motor driven
Including means for facilitating assembly or disassembly of...
C417S423150, C361S695000
Reexamination Certificate
active
06183214
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a cooling fan mounting arrangement for a network apparatus, and more particularly to such a cooling fan mounting arrangement which comprises a fan rack having an oblique fan support frame and angled suspension arms raised from the oblique fan support frame, and a fan supported on the oblique fan support frame and secured in place by the angled suspension arms and operated to induce currents of air for dissipating heat from the network apparatus.
Current network apparatus are designed to have as small a dimension as possible. In order to fit the tendency, the height of regular network apparatus is limited to IU (IU=44.45 mm). Because a network apparatus produces much heat during its operation, heat dissipating means must be provided to dissipate heat quickly, enabling the temperature of the network apparatus to be constantly maintained below its maximum working temperature. Regular mini cooling fans for use in network apparatus commonly have three sizes, namely, 40 mm×40 mm×10 mm; 30 mm×30 mm×10 mm; 25 mm×25 mm×10 mm. A cooling fan of 40 mm×40 mm×10 mm achieves better heat dissipation effect than the other sizes. However, it cannot be used in a network apparatus of height below IU (IU=44.45 mm). Therefore, a network apparatus of height below IU can only be equipped with cooling fans of relatively smaller sizes. However, a cooling fan of relatively smaller size is more expensive than a cooling fan of relatively bigger size. Furthermore, when a cooling fan of 30 mm×30 mm×10 mm or 25 mm×25 mm×10 mm is used in a network apparatus, it produces high noise during its operation.
SUMMARY OF THE INVENTION
The present invention accomodates the aforementioned considerations and requirements. It is one object of the present invention to provide a cooling fan mounting arrangement for a network apparatus, which occupies less vertical installation space in the network apparatus. It is another object of the present invention to provide a cooling fan mounting arrangement for a network apparatus, which produces low noise during the operation of the fan. According to the present invention, the cooling fan mounting arrangement comprises a fan rack fixedly fastened to the main board inside the housing of a network apparatus, and a fan supported on the fan rack. The fan rack has a fan support frame obliquely raised from a flat mounting base frame thereof, and two angled suspension arms bilaterally raised from the fan support frame for holding the fan on the fan support frame. Further, the suspension arms each have a retaining rod respectively engaged into a respective through hole at the fan to secure the fan in position. Because the fan support frame holds the fan inside the housing of the network apparatus in a sloping position, the installation of the fan rack and the fan occupies less vertical space. Because the fan is not attached to the vertical peripheral wall of the housing of the network apparatus, induced currents of air smoothly flow out of the network apparatus without causing much noise.
REFERENCES:
patent: 4164690 (1979-08-01), Muller et al.
patent: 5917698 (1999-06-01), Viallet
patent: 5969941 (1999-10-01), Cho
patent: 6061237 (2000-05-01), Sands et al.
Bacon & Thomas PLLC
D-Link Corporation
Freay Charles G.
LandOfFree
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