Acoustics – Combined
Patent
1985-12-24
1987-06-16
Fuller, Benjamin R.
Acoustics
Combined
181145, H05K 500
Patent
active
046730567
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a loudspeaker system which is intended for use in vehicles, is elongate and designed so as to be mounted in the inner roof of the vehicle, transversely in relation to the direction of travel of the vehicle, and which is primarily intended for steroephonic sound reproduction.
BACKGROUND ART
There are many different types of prior art loudspeakers for use in vehicles. As far as sound reproduction is concerned, one of the more successful members of the prior art is a loudspeaker system which is designed as an elongate arc, which has an upper side connected to the inner roof of the vehicle and has downwardly directed anchorage lugs which are intended for maintaining the loudspeaker arc in the longitudinal beam which, as a rule, are to be found in the region between the roof of the vehicle and its side walls. Such a loudspeaker arc is, generally, equipped with loudspeakers for stereophonic sound reproduction.
The above-described prior art loudspeakers are disclosed in Swedish Patent Specification No. 7603422-2 and are, in practice, produced by the vacuum forming of a plastics material. In order that the loudspeaker arc be capable of withstanding the mechanical forces caused by the loudspeaker units when the loudspeaker system is in use, the plastics material employed must be of some considerable thickness, which entails, in practice, that the anchorage lugs directed downwardly from the loudspeaker arc can only be employed with extreme difficulty (considerable risk for crack formation) in many vehicles in which there are tight radii of curvature in the area of transition between the inner roof of the vehicle and its side walls.
The prior art loudspeaker arcs are of one-piece construction, which entails that, generally speaking, they must be specially adapted to each individual vehicle model. It is easy to understand that this involves considerable problems not only as regards tool costs and storage, but also as regards transport, because of the size of the loudspeaker arcs.
OBJECT OF THE PRESENT INVENTION
The object of the present invention is to realise a loudspeaker system which makes full use of the great advantages of the above-mentioned loudspeaker arc, as regards sound reproduction, but which is designed in such a manner as to obviate prior art drawbacks.
SOLUTION
This object is achieved according to the present invention if the loudspeaker system, which is designed so as to be connected, with its upper face, to the inner roof of the vehicle on mounting with the longitudinal direction transverse in relation to the direction of travel of the vehicle, and is provided with at least two loudspeakers and anchorage portions for anchorage of the loudspeaker system to an anchorage member in opposing transitional regions between the side walls and roof of the vehicle, the invention being characterized in that the loudspeaker system has, at its both ends, a substantially rigid and enclosed unit with at least one loudspeaker and an anchorage portion in one end; and that both of the ends of the rigid unit turned to face away from the anchorage portions are interconnected by the intermediary of an interjacent portion of adaptable length.
One particularly simple embodiment of the loudspeaker system according to the present invention is characterized in that the interjacent portion comprises at least one form-stable portion which is telescopically connected to both of the rigid units, and one forming member which, at least downwardly, covers the form-stable portion and with its ends substantially continuously connects with both of the rigid units.
According to this embodiment of the present invention, it suitably applies that the form-stable portion is of rod or tubular configuration and that it is accomodated, at its ends, in corresponding opinings in the rigid units, and that the forming member is manufactured of a semi-hard, resiliently yieldable material and is of approximately uniform cross section throughout its length.
A modified embodiment of the present
REFERENCES:
patent: 3268229 (1966-08-01), Funk
patent: 4005761 (1977-02-01), Okanoto et al.
patent: 4056165 (1977-11-01), Okanoto et al.
patent: 4099026 (1978-07-01), Persson et al.
patent: 4100372 (1978-07-01), Hypolite
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