EP4304196A1 - Acoustic enclosure with back to back loudspeakers - Google Patents

Abstract

Acoustic enclosure (10) comprising a box (15) carrying two loudspeakers (26, 27) arranged head to tail and rigidly linked to each other, characterized in that it comprises, on the one hand, a single tie rod (40) connecting the two loudspeakers with two hooking ends, by complementarity of shape each cooperating with a loudspeaker (26, 27), the two ends being secured to one another in rotation around the axis (X-X) of the tie rod (40) and, on the other hand, an axial stop (50, 55) between the tie rod (40) and each speaker.

Description

The invention relates to an acoustic enclosure, of the type comprising a box carrying two speakers arranged head to tail and rigidly linked to each other.

Loudspeakers dedicated to low frequencies are bulky and heavy elements, likely to cause significant vibrations of the acoustic enclosure. Also, they are arranged head to tail so that the vibrations generated by one cancel those generated by the other.

To protect these speakers and allow sound propagation, a box surrounds the speakers, providing a rigid frame and acoustic insulation. These cases are heavy, being made of a resistant material like metal. Connecting the two speakers and fixing them in the box is complex.

Solutions are described for example in the document FR 3 087 067 .

In Figures 8 to 10, the two speakers are attached by joining them to a central core.

A first speaker is screwed through the central core, the screw being received in the fixed structure of the speaker.

The second speaker is provided on its rear face with a collar ring held by a screw. The central core comprises a support block in which the collared ring is retained by two pins engaged transversely to the axis of the two speakers.

This arrangement allows assembly and disassembly of the speakers from a radial opening provided in the box between the two speakers.

However, this device is heavy, and this is not suitable in certain areas of use where weight reduction is an objective, such as the automotive world.

The aim of the invention is to provide a lightweight acoustic enclosure.

For this purpose, the subject of the invention is an acoustic enclosure of the aforementioned type, characterized in that it comprises, on the one hand, a single tie rod for connecting the two speakers with two hooking ends, by complementarity of shape each cooperating with a loudspeaker, the two ends being integral with one another in rotation around the axis of the tie rod and, on the other hand, an axial stop between the tie rod and each loudspeaker.

• chaque haut-parleur est relié au caisson ;
• au moins pour un haut-parleur, une bague intermédiaire munie d'un jeu de fentes périphériques interposée entre le haut-parleur et le caisson et des vis de retenue de la bague sur le caisson engagées dans le jeu de fentes, le haut-parleur étant solidarisé à la bague ;
• le tirant comporte une tige filetée ;
• chaque butée comporte un écrou engagé sur la tige filetée et prenant appui sur chaque haut-parleur ;
• le caisson est fait en matière plastique ;
• le caisson définit une ouverture formant un accès au tirant ;
• une console obstrue l'accès à l'ouverture.

Depending on embodiments, the device has one or more of the following characteristics:

• each speaker is connected to the box;
• at least for a loudspeaker, an intermediate ring provided with a set of peripheral slots interposed between the loudspeaker and the box and screws retaining the ring on the box engaged in the set of slots, the loudspeaker being secured to the ring;
• the tie rod includes a threaded rod;
• each stop has a nut engaged on the threaded rod and supported on each speaker;
• the box is made of plastic;
• the box defines an opening forming access to the tie rod;
• a console obstructs access to the opening.

• fixation du premier haut-parleur au caisson ;
• fixation du tirant à l'arrière du premier haut-parleur ;
• fixation du second haut-parleur à la bague pour former l'ensemble rotatif ;
• fixation de l'arrière du second haut-parleur au tirant lors du montage de l'ensemble rotatif comportant le second haut-parleur sur le caisson ; et
• fixation de l'ensemble rotatif au caisson par la mise en place des vis de retenue dans les fentes périphériques de la bague.

The invention also relates to an assembly method comprising:

• fixing the first speaker to the box;
• fixing the tie rod to the rear of the first speaker;
• fixing the second speaker to the ring to form the rotating assembly;
• fixing the rear of the second speaker to the tie rod when mounting the rotating assembly comprising the second speaker on the box; And
• fixing the rotating assembly to the box by placing the retaining screws in the peripheral slots of the ring.

• [Fig 1] la figure 1 est une vue en perspective de l'enceinte acoustique en coupe selon un plan longitudinal médian ;
• [Fig 2] la figure 2 est une vue éclatée, en perspective, de l'enceinte acoustique représentée sur la figure 1 ; et
• [Fig 3] la figure 3 est une vue partielle en perspective de l'enceinte acoustique, des figures 1 et 2, d'une extrémité axiale de l'enceinte portant un haut-parleur.

The invention will be better understood on reading the description which follows, given solely by way of example and made with reference to the drawings in which:

• [ Figure 1 ] there figure 1 is a perspective view of the acoustic enclosure in section along a median longitudinal plane;
• [ Figure 2 ] there figure 2 is an exploded view, in perspective, of the acoustic enclosure shown on the figure 1 ; And
• [ Figure 3 ] there Figure 3 is a partial perspective view of the acoustic enclosure, the figures 1 And 2 , of an axial end of the enclosure carrying a loudspeaker.

The acoustic enclosure 10 shown on the figures 1 And 2 comprises a cylindrical box of circular section 15 of axis XX made of plastic material, defining two axial end openings 20, 25. The acoustic enclosure 10 comprises two speakers 26, 27 arranged head to tail along the axis XX and mounted in the two openings 20, 25. Alternatively, the shape of the box 15 is parallelepiped.

The box 15 comprises a cylindrical skirt 31 partially closed at one end by a circular rim 32 integral with the skirt and delimiting the receiving opening 20 of the loudspeaker.

The two speakers 26, 27 are identical and each comprise a rigid bowl 33 carrying a movable membrane 34. The loudspeaker comprises a motor 35 having a magnetic circuit 36 provided at the bottom of the bowl 33 and forming with it the fixed structure of the loud speaker. The motor also includes a moving coil secured to the membrane 34.

The rigid bowl 33 has on its periphery around the membrane 34 a peripheral fixing collar 37 provided with holes to accommodate screws.

The acoustic enclosure comprises a single tie rod 40 adapted to connect the fixed structures of the two speakers to each other.

As visible on the figure 1 , the tie rod 40 extending along the axis XX is a threaded rod, and carries two nuts 50, 55 serving as a stop to rigidly connect the two speakers 26, 27 together.

The single tie rod 40 has one end screwed into a tapped hole 56 provided axially on the fixed structure of the speaker 26. The nut 50 is screwed abutting against the speaker 26 to prevent any movement of the speaker 26 along of the single tie rod 40.

The second end of the single tie rod 40 is screwed into a tapped hole 57 provided at the rear of the loudspeaker 27 with the nut 55 tightened abutting against the fixed structure of the loudspeaker 27.

Bolts 60 connect the speaker 26 to the circular rim 32 of the box 15. These bolts include a screw engaged from the inside of the box 15 through aligned holes in the rim 32 and the peripheral collar 37 of the speaker 26. head of the screw is retained in rotation in a cavity of complementary shape of the rim 32. A nut tightened from the outside of the speaker 26 ensures the connection.

An intermediate ring 65 is interposed between the box 15 and the speaker 27 to allow the angular positioning of the speaker 27 relative to the box.

This ring 65 extends the cylindrical skirt 31 of the box 15 and extends radially inwards. It internally delimits a circular opening 70 for receiving the loudspeaker 27. This circular opening 70 is of the same size as the opening 20 for receiving the loudspeaker 26. The ring 65 has two rings of concentric holes to accommodate screws of connection to the box 15 and the loudspeaker 27.

An outer ring is located on the flat face of the ring 65 along the outer edge in the extension of the outer edge of the box 15 on the side of the opening 25. The holes in this outer ring are peripheral slots 75 positioned in the thickness of the ring 65 and in the extension of the box 15, visible on the Figure 3 .

The slots each extend over approximately 5° of arc and are separated from a trigger guard extending over less than 1° of arc. They therefore cover most of the crown.

The inner crown is located on a circle of smaller diameter corresponding to the diameter of the circle of screw holes of the peripheral fixing collar 37 of the speaker 27.

The loudspeaker 27 is connected by bolts 80 to the ring 65. The head of the screws is retained in rotation in a cavity of complementary shape to the ring. The screws are oriented from the inside of the ring 65 towards the outside of the speaker 27. The nuts are positioned from the exterior face of the speaker 27.

The ring 65 and the speaker 27 form a rotating assembly 85. Bolts 90 connect it to the box 15. These bolts are placed in the slots of the outer crown of the ring and hold the rotating assembly 85 to the box 15 with nuts retained in notches 95 opening onto the cylindrical exterior surface of the box 15.

The box 15 has an opening 96 in a direction orthogonal to the axis XX. This opening 96 is wide enough to allow a tool for tightening nuts 50, 55 to pass over the tie rod 40.

A fixing console 100 is screwed onto this opening 96 by bolts 105. The fixing console 100 is suitable for connecting the enclosure to the body of a motor vehicle.

The assembly of the acoustic enclosure 10 will now be briefly described, with reference to the figure 2 .

The speaker 26 is mounted on the box 15 by placing screws 60 in the smooth holes of the circular rim 32, passing through the interior of the box 15. These screws fix the speaker 26 to the box by immobilizing them with nuts from outside the speaker 26.

The tie rod 40 is screwed into the tapped hole 56 of the speaker 26 through the opening 25 in the box 15. The tie rod carries the two nuts 50, 55, previously mounted. The first nut 50 is tightened against the bottom of the bowl 33 of the speaker 26, immobilizing the tie rod 40 in rotation.

The speaker 27 is attached to the ring 65 by placing the bolts 80.

The rotating assembly 85 formed by the speaker 27 and the ring 65 is then screwed onto the tie rod 40. The tie rod 40, remaining static due to the nut 50, enters the tapped hole 57 of the speaker 27 by rotation thereof. The rotating assembly 85 rotates until the ring 65 rests on the box 15.

The nuts are placed in the notches 95 to securely hold the screws thus linking the rotating assembly 85 to the box 15.

The screws 90 are introduced into the peripheral slots 75, the length of which allows alignment of the screws 90 and the associated holes in the box 15. If alignment is impossible, the rotating assembly 85 is rotated a few additional degrees to ensure that the peripheral slots 75 are opposite the holes in the box 15. The screws 90 are tightened.

The nut 55 is tightened until it abuts against the bottom of the bowl 33 of the speaker 27, passing through the opening 96.

The electrical connections between the two speakers 26, 27 are made once the two speakers are rigidly linked to each other, limiting the impact of the rotation of the speaker 27 on the electronic coupling of the two loudspeakers. -speakers. The screws forming part of the bolts 105 are installed along the opening 96 before closing the latter.

The opening 96 is blocked by the fixing bracket 100 using bolts 105 and tightening the corresponding nuts.

For dismantling the acoustic enclosure 10, the opposite approach is used.

The acoustic enclosure 10 has the advantage of being compact, simple to assemble and disassemble and of not requiring glue or other chemical elements.

Claims (10)

Acoustic enclosure (10) comprising a box (15) carrying two loudspeakers (26, 27) arranged head to tail and rigidly linked to each other, characterized in that it comprises, on the one hand, a single tie rod (40) connecting the two loudspeakers with two hooking ends, by complementarity of shape each cooperating with a loudspeaker (26, 27), the two ends being secured to one another in rotation around the axis (XX) of the tie rod (40) and, on the other hand, an axial stop (50, 55) between the tie rod (40) and each speaker (26, 27). Acoustic enclosure (10) according to claim 1, in which each loudspeaker (26, 27) is connected to the box (15). Acoustic enclosure (10) according to claim 2, comprising at least for one loudspeaker, an intermediate ring (65) provided with a set of peripheral slots (75) interposed between the loudspeaker (27) and the box (15). ) and retaining screws (90) of the ring (65) on the box (15) engaged in the set of slots (75), the speaker (27) being secured to the ring (65). Acoustic enclosure (10) according to any one of the preceding claims, in which the tie rod (40) comprises a threaded rod. Acoustic enclosure (10) according to claim 4, in which each stop comprises a nut (50, 55) engaged on the threaded rod and bearing on each loudspeaker (26, 27). Acoustic enclosure (10) according to any one of the preceding claims, in which the box (15) is made of plastic material. Acoustic enclosure (10) according to any one of the preceding claims, in which the box (15) defines an opening (96) forming access to the tie rod (40). Acoustic enclosure (10) according to claim 7, wherein a console (100) obstructs access to the opening (96). Method of mounting the acoustic enclosure (10) according to any one of the preceding claims, the method comprising: - fixing a first speaker (26) to the box (15); - fixing the tie rod (40) to the rear of the first speaker (26); And - fixing the rear of the second speaker (27) to the tie rod (40), when mounting the second speaker (27) on the box. Method of mounting the acoustic enclosure (10) according to claim 3, the method comprising: - fixing the first speaker (26) to the box (15); - fixing the tie rod (40) to the rear of the first speaker (26); - fixing the second speaker (27) to the ring (65) to form the rotating assembly (85); - fixing the rear of the second speaker (27) to the tie rod (40) when mounting the rotating assembly (85) comprising the second speaker (27) on the box (15); And - fixing the rotating assembly (85) to the box (15) by placing the retaining screws (90) in the peripheral slots (75) of the ring (65).

Images