This invention relates to a speaker supporting unit which is most adapted to attach a speaker unit to a door panel of an automobile.
In an audio system installed in an automobile, a speaker unit is often attached to a door panel of the automobile. One of the prior art technique for mounting the speaker unit is shown in FIG. 12 and FIG. 13 which employs a pair of dish-shaped mounting bases 62 and 64. The interior mounting base 62 is inserted through a circular opening 60a formed in the door panel 60 to be engaged within the other mounting base 64. These mounting bases 62 and 64 are then joined together by fastening screws 65, 65. The mounting base assembly is thus secured to the door panel 60 by rims thereof tightened across the door panel 60. There are interposed between the mounting bases 62 and 64 a predetermined number of washers 66 corresponding to the thickness of the door panel 60, to prevent deformation of the mounting bases when tightened. A speaker 70 to which a grille lid 68 is attached is contained in the mounting base 62 and secured by any suitable fastening means (not shown). In this prior art, a spacer 72 may be additionally employed in a manner as particularly shown in FIG. 13 to change and adjust the orientation of the speaker 70, in which case the screw 74 should be accompanied by a bracket 76 to thereby extend in a direction perpendicular to the inclined orientation of the speaker 70.
According to the foregoing prior art, however, the orientation of the speaker 70 will be determined in dependence upon the inclination of the spacer 72. It has been impossible to adjust as desired the orientation of the speaker within a wide adjustable range. One or more sets of the spacer and the corresponding bracket should be prepared and selectively used upon necessity, which not only is troublesome but also may cause accidental loss of the adjustment members. Further, as the inner diameter of the mount base should be large enough to allow the orientation of the speaker to be changed, there might be a great probability of foreign matter entering into the mount base.