Patent
1989-03-29
1990-05-29
Joyce, Harold
98 4024, B60H 134, F24F 1312
Patent
active
049285823
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a nozzle for discharging ventilation air from a ventilation system, preferably arranged in a vehicle, including at least one outlet housing with a through-flow duct for ventilation air, a plate transverse the flow direction and rigidly attached to the outlet housing, and a plurality of plates parallel to said fixed plate, these plates being arranged mutually displaceable in the transverse direction under the action of a control lever, the plates having patterns of holes, which in coaction form ventilation ducts through which the ventilation air can flow and, in response to the setting of the control lever, allow deviation of the flow direction of the ventilation air.
For leading ventilation air from a ventilation system to a room or a separate space, e.g. a vehicle passenger compartment, it is usual to equip the outlets from the ventilation system with outlet nozzles. In a vehicle passenger compartment it is also often usual to arrange a plurality of outlets from the ventilation system, these outlets preferably being placed at the floor, windscreen and fascia. The outlet nozzles in the fascia are in this case usually adjustable so that the ventilation air can be distributed in different directions.
It is previously known to implement such an adjustable outlet nozzle in vehicles in the form of adjustable louvres which are pivotably mounted in a rectangular frame, which is in turn articulately attached to a rigid body or the like. By turning either the louvres and/or the frame, the ventilation air flowing out can be given different directions.
In the known structure mentioned, the necessity of turning the frame by itself and the louvres by themselves is, however, a complicated adjusting procedure for many people. Added to this, the structure contains a large number of parts which require great accuracy in manufacture and assembly to achieve the desired coaction. These conditions result in that such an outlet nozzle is often relatively expensive.
The U.S. Pat. No. 3,672,293 teaches another outlet nozzle which includes a plurality of parallel plates arranged at right angles to the flow direction. These plates are formed as grids, and all the plates have perfection patterns which in coaction form ventilation ducts. The plates are arranged for parallel displacement relative each other with the aid of a control lever passing through a central hole in each plate. For such displacement, the perforations in the plates will also be displaced, the ventilation ducts being given a deflection which allows air to flow in a given direction.
The latter nozzle indeed as obvious advantages in comparison with the nozzle first mentioned but has also so many obvious disadvantages that the nozzle has not been utilized in practice. Thus, the nozzle requires a comparatively large number of parts which makes the structure expensive to produce. Furthermore, setting of the plates is difficult to carry out with the aid of the control lever, since in different positions it causes play relative to the plates and thereby an inaccurate setting.
The plates in the nozzle according to the cited U.S. patent specification No. 3,672,293 are disposed for mutual engagement under the bias of a compression spring axially surrounding the control lever. With such a coaction, the spring strives to set the plates in a position where they are not displaced relative each other, e.g. in a position corresponding to straight through passage of the ventilation air. This means that there is risk for the set oblique ventilation position in the nozzle not being maintained due to the spring striving to maintain a central setting.
Another variation on how a discharge nozzle including a plurality of parallel plates can be arranged is described in the International patent specification with the publication No. WO84/04498. In this case the control lever is formed like a tuning fork which, with longitudinal slots, is adapted to grip a grid cross in each of the displaceable plates. Here the cross comprises two bars crossing each other,
REFERENCES:
patent: 3672293 (1972-06-01), Gona et al.
patent: 4614151 (1986-09-01), Elfverson
patent: 4653385 (1987-03-01), Ito et al.
Joyce Harold
Saab-Scania Aktiebolag
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