FR2842938A1 - Acoustic insulation support e.g. for sound reproduction equipment has upper and lower domes separated by sphere of smaller diameter - Google Patents

Abstract

The insulating support consists of identical upper and lower domed sections (4) separated by a sphere (5) of smaller diameter between their convex surfaces. The domes and sphere have polished steel surfaces, and the domes are enclosed in cylinders (2) of brass and are lubricated. The flat surface of the upper dome has a double-sided adhesive layer (1) that attaches to PVC, and the flat surface of the lower one has a plastic disc (3).

Description

The device presented applies to visual and sound reproduction

  as well as measuring devices requiring excellent decoupling of the vibratory movements of the supports whatever they are, the objective is to

  minimize information loss from the source.

  When a device generates vibrations, either because it contains moving parts, CDs, DVDs, speakers with speakers or vibrating components (capacitors, transformers, tubes), these vibrations do not flow naturally. They can stagnate in the device and by

  reaction thus disturbing the initial source by creating a mask.

  Likewise, the supports of these same devices can transmit vibrations by air or air to the emission devices.

thus disturbing them.

  We thus seek to isolate the devices by flowing the vibrations emanating from them, without always worrying about the loss of the original information

  induced by these same insulation systems.

  Many sound insulation systems have been put on the market.

  These systems can be grouped into 4 families * Plate of various resilient materials * More or less elastic suspension based on spring and sandwich of materials, see magnet element in phase opposition thus having no

no physical contact between them.

  * System comprising balls in connection with a high and low support

  can be combined with various suspensions of the 2nd family.

  * Cones, points of various materials, metal, ceramics, carbon, etc. These systems, which all have advantages, do not always achieve the expected result, due to an incomplete analysis of the vibratory effects or an insufficiently careful execution, on the reproduction of sound or images, in particular on CD players, players DVDs, amplifiers,

  converters or enclosures where these systems are implemented.

  The present invention relates to an acoustic insulation device to be implemented between the device that is to be isolated and its support which can be a

  table, bench, shelves or floor.

  1 The search for the suppression of vibrations, whether solid or aerial, and for the mask effect it induces at night on measuring devices or the elements of an acoustic reproduction system is intended to recreate the conditions optimal restitution of the original information. No resilient material that absorbs vibrations is used because these inevitably lead to the loss of information from

  sources (CD, DVC, loudspeakers, amplifier, etc.).

  The system according to the invention makes it possible to break the solidary transmission chain of vibrations as well as the effects due to aerial transmissions

  by transforming them into kinetic energy.

  The device according to the invention comprises three separate parts as

  shown in the accompanying drawing.

  * The upper part (upper stud) comprising a cup in the form of

spherical cap (4).

  * A sphere, preferably in polished steel (5) ensuring contact between the

lower and upper studs.

  * The lower part (lower stud) (4) comprising a spherical cap

  identical to the upper part but inverted compared to the first.

  The upper cup is composed as follows: * A polished steel cup with a portion of a sphere (4)

  identical to the lower cup.

  This cup is set in a brass tube (2).

  The steel part in the portion of a sphere is polished and crimped into a tube

  brass which thus creates a prestress in steel.

  The upper side is composed of a sandwich (1) comprising a sticker

  double-sided on a rigid PVC disc glued on part (4).

  The upper cup can be made integral with the device to be insulated.

  The lower cup is identical to the upper cup for the parts

(2) and (4).

  The underside (3) consists of a rigid PVC disc glued to the

part (4).

  1 By way of nonlimiting example, the external dimensions of the studs are 0 mm and the spherical ball is 0 16 mm for an admissible load of

kg per stud.

  * For higher loads, the diameter of the studs is larger.

  * To isolate a device, we use 3 high cups, 3 low cups, 3 balls to form an isosceles triangle with 3 vertices

define a virtual plan.

  The triangle is preferably isosceles in the case of a symmetrical load. In the case of a asymmetrical load, the 3 studs form any triangle whose barycenter corresponds to the center of gravity of the assembly. * If the loads are very high and there is a risk of tipping, either as a result of manipulation or an eccentric center of gravity or the presence of an audience able to lean on the device, a 4th stud can be used for more safety (to be implemented at each angle of

in this case).

  The device according to the invention is particularly intended for reproduction

  music, visual CD or DVD as well as measuring devices.

  The two cups in a portion of a sphere ensure the self-centering and balance of the device, under the effect of vibrations generated either by the device itself, or the reaction due to the support, because the movements of the ball creates restoring forces which bring the device back to its equilibrium position. The nature of the different materials makes it possible to have different natural frequencies for each material and thus the overall device within

risk entering into resonance.

  The vibrations flow at the point of contact of the ball and the spherical caps (for example vibrations due to the reading of a disc

eccentric).

  1 In order to minimize the friction forces, each cup is lubricated with a special oil with a very low viscosity index in order to facilitate the movements of the devices on the studs as much as possible. The greater the number of oscillations under the effect of a horizontal force, the better the decoupling. The radius of the sphere is less than that of the spherical caps of the cups. The device has been described according to the preferred embodiment but it is of course possible to replace certain materials with comparable materials at the cost possibly of a slight change in performance. The outer casing has an overhang (6) which makes it possible to block the excursion of the ball during very large movements (for example on equipment carried by boat or plane). The height of the overhang is

variable according to the uses.

  If the ratio (or the ground) is not horizontal and it is not possible to improve it, the device is used with a lower cup of variable height. If the weight of the devices is more than 70 kg per stud (i.e. 210 kg / device), the device uses other materials allowing 400 kg / device (grade

steel).

Claims (1)

Claims 1 11) Acoustic insulation device characterized in that it consists of an upper part comprising a cup (4), a lower part identical to the upper part but inverted and a sphere (5) ensuring the contact between the 2 lower and upper cups. The radius of the sphere (5) being smaller than that of the cups so as to allow the movement of the sphere with a return effect. 2) Device according to claim 1 characterized in that the cups are in the form of a spherical cap. 3) Device according to any one of the preceding claims, characterized in that the sphere (5) is made of polished steel. 4) Device according to any one of the preceding claims, characterized in that the cups are made of polished steel. ) Device according to any one of the preceding claims, characterized in that the cups are lubricated.   1 5 6) Device according to any one of the preceding claims   characterized in that the cups are crimped in a brass tube (2).   7) Device according to any one of the preceding claims   characterized in that the brass tube has an overhang (6).   8) Device according to any one of the preceding claims   characterized in that the planar face of the upper cup has a self-adhesive side on PVC (1).   9) Device according to any one of the preceding claims   characterized in that the planar face of the lower cup has a hard PVC disc (3).