JPH0130272Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a shock absorbing device for damping the rotation of a rotatable box surrounded by a thin plate, such as a speaker box that is rotatably supported. The present invention relates to the structure of a mounting portion of a piston-type damper used for this purpose.

Four-speaker stereo systems are also becoming widely used in automobile stereo systems. In such a four-speaker stereo system, the rear speakers are installed at the rear of the vehicle, but in high-roof passenger cars, for example,
It is conceivable to use the space under the roof to attach the speaker box of the rear speaker to the rear roof part of the vehicle interior. Furthermore, in the case of a hatchback vehicle, if the speaker box is installed so that it can be rotated downward and directed toward the rear of the vehicle, when the car is parked outdoors, the tailgate can be opened and the speaker box can be rotated. By lowering it, you can enjoy music even outside the car.

Incidentally, such a speaker box is usually formed as a closed box made of a thin plate of synthetic resin or the like. Furthermore, relatively heavy electrical components such as a speaker are housed inside. Therefore, if such a rotating speaker box is allowed to freely lower due to its own weight, when the lock on the roof is released, it will rapidly rotate downward and the There is a risk that the thin plate box body may be damaged due to impact etc. Therefore, if such a rotary speaker box is to be lowered by its own weight, it is necessary to provide a damper so that the lowering is performed slowly and smoothly. Such dampers are usually
A piston type is used.

In this way, when the rotation of the speaker box is damped by a piston type damper,
The base end of the damper must be pivotally supported on the vehicle body at a position different from the rotation axis of the speaker box. Further, the damper must not interfere with the speaker box when it rotates. Therefore, it is conceivable to arrange the damper above the speaker box. However, if this is done, the storage space for the speaker box must be increased, and the living space inside the vehicle will be constricted accordingly.
In particular, in order to obtain sufficient damping force from the damper, it is necessary to increase the distance between the rotation axis of the speaker box and the axis of the damper.
To achieve this, the storage space for the speaker box must be made even larger.

Further, since the load of the speaker box is applied to the damper, a component force is applied to the speaker box from the pivot point at the tip of the damper in a direction perpendicular to the surface of the speaker box. Therefore, when the tip of the damper is pivotally supported on the top surface of the speaker box, if the top surface and the axis of the damper form a large angle when the speaker box rotates, a large vertical partial pressure will be generated on the top surface of the speaker box. The speaker box, which is made of thin plate, may be deformed due to the work. When the speaker box is deformed in this way, it is no longer able to maintain its sealed state, and the acoustic effect is degraded.

It is possible to place the damper on the side of the speaker box, but doing so would not only make the damper visible from inside the vehicle, but also spoil the appearance.
The width of the speaker box must be reduced to accommodate the damper, making it impossible to obtain sufficient acoustic effects.

The above-mentioned problems are not limited to speaker boxes for automobiles, but always occur when a damper is attached to a rotary box made of a thin plate that is housed in a narrow storage space.

The present invention was devised in view of these problems, and its purpose is to provide a damper that can be installed while providing sufficient damping force even when the storage space of the rotating box is narrow. By making the force applied by the damper substantially parallel to the surface of the outer panel of the box, even if the box is formed of a thin outer panel, it can be prevented from deforming. The aim is to ensure that there are almost no

In order to achieve this purpose, the present invention involves recessing the outer panel of the box to form a groove, and supporting the tip of the damper by the bottom of the groove. The damper is arranged such that the damper is housed in the groove, and the axis of the damper is kept substantially parallel to the bottom surface of the groove.

Hereinafter, the present invention will be explained in more detail based on the drawings.

Figures 1 to 3 show an embodiment in which the present invention is applied to a rotary speaker box for an automobile.
The figure is a schematic side view of an automobile equipped with the speaker box, FIG. 2 is an enlarged sectional view showing the speaker box in a stored state, and FIG. 3 is a perspective view of the speaker box.

As shown in FIG. 1, this automobile C is a high-roof type hatchback vehicle, and a speaker box 1 is mounted on the rear roof portion of the vehicle interior and rotates from the position shown by the solid line in the figure to the position shown by the imaginary line. Installed to get. Speakers 2 are provided on the left and right sides of the speaker box 1, and when the car C is running normally, the speaker box 1 is stored at the solid line position in the figure, and the speaker 2
The rear speakers face the interior of the vehicle, allowing you to enjoy 4-speaker stereo music.
When listening to music outside the vehicle, the vehicle C is stopped, the tailgate T is opened, and the speaker box 1 is rotated and lowered to the position shown by the imaginary line in the figure. As a result, the speaker 2 faces toward the rear outside the vehicle, so that two-speaker stereo music can be enjoyed even outside the vehicle.

In order to be able to store and lower the speaker box 1 in this way, the rear roof of the automobile C is provided with a fixed frame, ie, a storage box 3, shaped to match the speaker box 1, as shown in FIG. It is being A horizontal hinge shaft 4 is provided at the bottom of the rear end (right end in FIG. 2) of the storage box 3, and the speaker box 1 can be attached to the speaker box 1 rotatably in the vertical direction by this hinge shaft 4. It's getting old. speaker box 1
A locking device 5 is provided at the front end (left end in FIG. 2) of the speaker box 1, and by engaging the locking device 5 with a striker 6 provided in the storage box 3, the speaker box 1 can be moved into its storage position. It is designed to be held in position.

As shown in FIGS. 2 and 3, the speaker box 1 is formed as an airtight box surrounded by an outer plate, and includes an upper portion 1a and a lower portion 1b made of thin sheets of synthetic resin. The upper plate of the upper portion 1a is recessed at the center rear, thereby forming a groove 7 that opens upward and rearward. A recessed hole 8 is provided in the bottom surface 7a of this recessed groove 7, and by inserting a tapping screw 9 into this recessed hole 8 and tightening it to a boss 10 formed on the lower plate of the lower portion 1b, The bottom surface 7a of the groove 7 and the lower portion 1b are fixed to each other.

A piston-shaped damper 11 is accommodated in this groove 7. The rear end of the damper 11, that is, the base end 11a, is rotatably supported in the vertical direction by a horizontal shaft 12 provided above the rear end of the storage box 3 on the vehicle body side. This horizontal shaft 12 is provided in front of and above the hinge shaft 4, which is the center of rotation of the speaker box 1. Further, the tip 11b of the damper 11 is attached to a horizontal shaft 1 provided at the front end of the groove 7 of the speaker box 1.
3, it is rotatably supported in the vertical direction. This horizontal shaft 13 is connected to a damper holder 14 provided in a portion extending from the bottom surface 7a of the groove 7 to the front wall 7b.
Supported by.

In this way, as shown in FIG. 2, in the storage position of the speaker box 1, the damper 11 is arranged so as to be inclined in the vertical direction within the groove 7. On the other hand, the bottom surface 7a of the groove 7 is also
It is formed to be inclined in substantially the same direction as 1. The inclination of the bottom surface 7a of the groove 7 is such that when the speaker box 1 rotates, the angle formed with the axis of the damper 11 is always kept small, that is, it is always almost parallel to the axis of the damper 11. It is set in advance according to the positions of the hinge shaft 4 of the speaker box 1 and the horizontal shafts 12 and 13 of the damper 11. In other words, the positions of the pivot points of the damper 11, that is, the horizontal shafts 12 and 13, are determined according to the inclination of the bottom surface 7a of the groove 7.

In the rotary speaker box 1 configured as described above, when the locking device 5 is removed from the striker 6 when the speaker box 1 is in the stored state as shown in FIG. and rotates downward about the hinge shaft 4. At this time, the damper 11, which is pivotally supported by the storage box 3 on the vehicle body side at a position different from the hinge shaft 4, receives the tensile force and gradually expands due to the damper action. Therefore, the rotation of the speaker box 1 is performed slowly and smoothly, and the generation of impact due to rapid rotation is prevented. When the speaker box 1 is lowered the most and is in a substantially vertical state, the damper 11 is extended the most and the rotation of the speaker box 1 is stopped.

During this time, due to the tensile force applied to the damper 11, a force in the axial direction of the damper 11 is applied to the speaker box 1 from the horizontal shaft 13 on which the damper 11 is pivotally supported. This power is the speaker box 1
The component force in the direction of the bottom surface 7a of the concave groove 7 and the bottom surface 7
However, since the angle between the bottom surface 7a and the damper 11 is kept small, the component force in the direction perpendicular to the bottom surface 7a is extremely small. Therefore, damper 1
1 to the speaker box 1 becomes a compressive force along the bottom surface 7a of the groove 7. Since even a thin plate can sufficiently withstand such in-plane force, deformation of the speaker box 1 due to the force from the damper 11 becomes extremely small. Furthermore, as described above, the bottom surface 7a of the groove 7 and the lower portion 1b of the speaker box 1
By fixing them firmly, the load applied to the bottom surface 7a of the groove 7 can be dispersed to the lower portion 1b, so that deformation of the speaker box 1 can be almost eliminated.

Moreover, such a groove 7 is provided in the speaker box 1.
By providing this, the rigidity of the speaker box 1 itself is also increased. Moreover, the tip 1 of the damper 11
1b is pivotally supported from the bottom surface 7a of the groove 7 to the front wall 7b.
The part that extends is the most rigid, so the bottom surface 7
The speaker box 1 is hardly deformed even by a component force perpendicular to a. However, depending on the length of the damper 11, the tip 11b may be pivoted only on the bottom surface 7a of the groove 7. Since the groove 7 is formed by the bottom surface 7a and the side walls on both sides thereof, the rigidity of the bottom surface 7a is sufficiently large. Also, since it is sufficient that most of the load is supported by the bottom surface 7a, the front wall 7a
The tip 11b of the damper 11 can also be pivotally supported very close to the bottom surface 7a of the lower part b.

As shown in FIG. 2, by arranging the damper 11 so that it is inclined when the speaker box 1 is in the stored state, the distance from the hinge shaft 4 to the axis of the damper 11 becomes smaller than when the damper 11 is arranged horizontally. larger than the case. As a result, the moment arm of the damper 11 around the hinge shaft 4 becomes larger, so that a sufficient damping force of the damper 11 can be obtained.

When the speaker box 1 in the lowered state is rotated upward and stored, the action of the damper 11 is not so necessary. Therefore, it is desirable that the damper 11 be a one-way damper.

In the above embodiment, the groove 7 is provided in the center of the speaker box 1 in the left-right direction, but if there is a possibility that the speaker box 1 may be twisted, the installation of the speaker 2 may be changed. It is desirable to provide such grooves 7 on both the left and right sides at positions where they will not interfere, and to attach dampers 11 to each.

Furthermore, the present invention is not only applicable to the above-mentioned rotatable speaker box of an automobile, but also to a shock absorber for a general foldable speaker box that is rotated from an upright position to a horizontal position. It is something that can be done. In that case, the storage box 3 in the above embodiment can be used as an appropriate fixed frame, and a damper that acts as a damper when contracted is connected between the fixed frame and the foldable box, and the rest can be carried out as described above. It is obvious that similar effects can be obtained by using the same configuration as in the example.

As is clear from the above description, according to the present invention, a concave groove is provided in the rotary box surrounded by the outer plate, and the damper can be accommodated in the concave groove. Even if the storage space for the rotary box is small, the damper can be installed so that sufficient damping force can be obtained, and the damper can be hidden from view from the outside without damaging the appearance. You can avoid it. The bottom surface of the groove supports the tip of the damper, and the bottom surface and the axis of the damper are always almost parallel, so that almost no force is applied from the damper to the rotating box. The force is applied along the bottom surface of the groove, and even if the box is made of a thin plate, its deformation can be minimized. In addition, the thickness of the outer panel of the box can be reduced.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of an automobile equipped with a rotating speaker box to which the present invention is applied, and FIG. 2 is an enlarged cross-sectional view showing the stowed state of the rotating speaker box of an automobile to which the present invention is applied. , Figure 3 is
FIG. 3 is a perspective view of the speaker box of FIG. 2; 1...Speaker box (rotating box), 2
...Speaker, 3...Storage box (fixed frame),
4... Hinge shaft, 7... Concave groove, 7a... Concave groove bottom, 11... Damper, 11a... Damper base end, 1
1b...Damper tip, 12, 13...Horizontal axis, C
...Car, T...Tailgate.

Claims (1)

[Claims for Utility Model Registration] A box 1 surrounded by an outer plate is rotatably supported on a fixed frame 3 by a hinge shaft 4, and a tip 11b of a piston-type damper 11.
In a shock absorber for a rotating box, the base end 11a of the damper 11 is pivotally supported on the fixed frame 3 at a position different from the hinge shaft 4; , a groove 7 capable of accommodating the damper 11 is formed, the tip 11b of the damper 11 is supported by the bottom surface 7a of the groove 7, and the axis of the damper 11 is aligned with the groove 7. A structure for a damper mounting part in a shock absorbing device for a rotating box, characterized in that the damper mounting part is arranged so as to be always substantially parallel to the bottom surface 7a.