Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1997-10-15
1999-03-30
Thompson, Gregory
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
361610, H05H 720
Patent
active
058896503
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a stand or rack arrangement, and more particularly, to such a rack arrangement that is designed and adapted for use in telecommunications systems.
A rack arrangement, that exhibits the basic characteristics of the present invention, uses a framework or a rack, adapted to be able to support several magazines that are positioned above one another, whereby each magazine encloses several printed boards or printed board assemblies that are related or situated side by side.
Further, a frontal surface of the rack arrangement must be able to coincide, or appreciably or essentially coincide, with a front plane of each magazine.
In addition, an edge section for each printed board or printed board assembly shows boardrelated connectors, designed for a firm but easily removable interaction with corresponding connectors, related to the back plane of the magazine.
Means or cassettes, which are designed to control a flow of air intended to cool at least printed boards or printed board assemblies, are arranged between adjacent magazines and at a vertical distance from one another. The magazine and/or the means is arranged so that, from a fully inserted position in the rack, the magazine and/or means may be displaced, along guides that are mounted in the rack, to project beyond the rack, or vice versa.
DESCRIPTION OF THE BACKGROUND ART
Printed boards are used within telecommunications systems and boards of this kind contain electrical conductors or wires that have been run or arranged by using layers of electrically-conducting foil and by arranging a number of foils above eachother, each foil separated by an intermediate layer of electrically-insulating foil, and by arranging required connections between the electrical foils.
When discrete components are mounted on one or both sides of such a printed board, then such an arrangement is called a printed board assembly.
However, in the description that follows we have used the term "printed board" to apply to both categories.
Printed boards of this kind, and for the application described above, require an electrical interaction with each other and therefore several printed boards are mechanically supported by a magazine. By means of electrical conductors via a back plane of the magazine said printed boards may electrically be interacted or interconnected with one another.
The printed boards are equipped with edge-related connectors or contact means, and the back plane of the magazine is equipped with corresponding connectors or contact means.
The connectors that belong to the printed boards are arranged to be able to interact with connectors that belong to the magazine. These connectors are coordinated in rows to the back plane.
Ordinarily, the back plane for magazines of this kind supports only required electrical conductors; that is the conductors that are required to connect the printed boards functionally to one another.
It is a known practice to use a rack arrangement that is designed to be able to hold several magazines, ordinarily positioned above one another, at a vertical distance from one another.
Rack arrangements, of the kind described above, have existed in numerous different embodiments. A common feature for one category of these rack arrangements is that the magazines can, via guides, be horizontally displaced from a fully-inserted position in the rack to a position that projects beyond the rack, and vice versa, thereby making the printed boards or the printed board assemblies that belong to the magazine more accessible for inspection or for replacement.
One or more printed boards might be replaced partly when a printed board malfunctions partly when the function has been modified in a way that requires a new printed board.
It is common for rack arrangements of this kind to interact with several magazines, each of which is equipped with a fixed back plane that has connectors positioned in columns or rows, and where the back plane in addition thereto is equipped with required bus arrangements and other electri
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patent: 4530632 (1985-07-01), Perry, II
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patent: 5234348 (1993-08-01), Konsevich et al.
patent: 5245527 (1993-09-01), Duff et al.
patent: 5325270 (1994-06-01), Wenger et al.
Bertilsson Lars Yngve
Nygren Lars Goran
Wennerberg Jan Roger
Telefonaktiebolaget LM Ericsson
Thompson Gregory
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