FR2634462A1 - SHOCK ABSORBER AND SET FOR THE PACKAGING OF FRAGILE PRODUCTS - Google Patents

Abstract

Wedging and damping pad for the packaging, characterized in that it is made of a deformable synthetic material called memory, in that it comprises an internal chamber 4 open at its base 1 in communication with the outside by a vent 5, the volume of the chamber being approximately equal to 10% of the total volume of the stud.

Description

Damping and wedging block for the packaging of fragile products

  The invention relates to the field of packaging fragile devices such as for example computers, cash registers or

  scientific apparatus and instruments.

  During their handling, these devices are exposed to falls or shocks. This is why their packaging is lined with materials or devices for cushioning and padding such as plastic chips, tablecloths or blocks of

foam.

  For the most expensive and most fragile devices, molded polystyrene shells are generally used which partially or completely follow the shapes of the product. However, this technique is relatively expensive because it requires one or more injection molds to be made for each device model. The present invention aims to provide a new means of wedging and damping which makes it possible to produce suitable packaging whatever the shape of the product to be packaged and which exhibits damping performance far superior to that of protective devices using molded shells , while being of a cost price appreciably

inferior.

  To this end, the invention is embodied by a pad made of deformable synthetic material called "memory", said pad comprising an internal chamber open at its base, the volume of which is approximately equal to 10% of the total volume of the pad, a vent being spared between said

bedroom and outside the stud.

  By memory material is meant any material capable of gradually deforming under the effect of an impact or of pressure and of fully recovering its initial shape when the stress exerted on it ceases. A material of this type is by

example molded polyethylene.

  The presence of the internal chamber in communication with the outside by a vent plays the role of a pneumatic shock absorber whose effect combines with the absorption capacity specific to the material constituting the stud to ensure that it gradually progressive deformation , even under the effect of very high forces which avoids or retreats

  considerably the limit threshold, the absorption threshold -

  and the appearance of the tailgating effect.

  According to an advantageous embodiment, the stud according to the invention is of generally frustoconical shape in section with an angle of inclination of

  its sides between 15 and 30.

  Preferably the angle of inclination of the sides of the

stud is 20 '.

  According to another advantageous characteristic, the opening diameter of the base of the chamber is less than and at most equal to the diameter of the top of the stud. The pad according to the invention is moldable in series and is intended to be glued by its base to the interior walls of the packaging to which it is applied in number and according to a provision determined case by case according to the shapes of the product to be protected, of his

  weight and damping capacity required.

  With the pads according to the invention, it is possible to produce packages whose damping capacity * is approximately twice that of the currently known packaging shells

for a significantly lower cost.

  Other features and benefits of

  the invention will emerge from the description qui.va

  - Follow examples of embodiment of studs according to the invention, with reference to the accompanying drawings in which Figure 1 is a sectional profile view of a first stud according to the invention; Figure 2 is a half plan view to the pad of Figure 1; Figure 3 is a side sectional view of a second pad according to the invention, and Figure 4 is a half plan view of the pad

Figure 3.

  The studs shown in Figures 1 to 4 are generally frustoconical. They are made of molded polyethylene, advantageously of a polyethylene known under the trade names EPERAN or NEOPOLEN. The stud comprises a base 1, a conical wall 2 converging towards a top 3 which constitutes the contact surface with the product to be packaged and an internal chamber 4 in communication with the outside by a vent 5 which, in the example shown, is arranged between the part

  upper chamber and top 3.

  Reference 6, represents the lower edge of

the wall of the chamber 4.

  Vent 5 can be arranged differently, for example it can be constituted by a radial groove

practiced in base 1 of the stud.

  The two studs shown in Figures 1 to 4 are two studs of the same series whose following dimensions are constant: - base diameter: 115 mm - angle of inclination of the wall: 20 '- distance between the top of the chamber and the

top of the stud: 15 mm.

  The only difference is the height (30 mm for the stud in Figures 1 and 2 and 100 mm for the stud in Figures 3 and 4) and the diameter of the top (93 mm and

44 mm).

  In the examples of Figures 1 to 4, the studs

  shown are frustoconical in shape as well.

  section in volume. It is possible without departing from the scope of the invention to produce studs which, while retaining a frustoconical shape in section, will have a

  contour of substantially different geometric shape.

  Figures 5a to 15b show eleven different possible embodiments with for each form a schematic profile view and a half plan view. For convenience, the room and its vent have not been shown but it is easily understood that they are similar to those of the examples of

realization of Figures 1 to 4.

claims

  1. Wedging and damping pad for packaging, characterized in that it is made of deformable synthetic material called memory, in that it comprises an internal chamber (4) open at its base (1) in communication with the outside via a vent (5), the volume of the chamber being approximately equal to 10%

of the total volume of the stud.

  2. stud according to claim 1, characterized in that it is of generally frustoconical shape in section 1 and in that its wall at an angle of inclination included

between 15 'and 30'.

  3. Plot according to claim 2, characterized in

  what the inclination of its wall is 20 '.

  4. stud according to claim 2 or 3, characterized in that the opening diameter of the base (1) of the chamber (4) is at most equal to the diameter

from the top (3).

5. Plot according to any one of

  claims 2 to 4, characterized in that the part

  upper part of the chamber (4) is constituted by a half sphere. 6. Plot according to any one of

  claims 2 to 5, characterized by the dimensions

  following: - diameter of the base: 115 mm - angle of inclination of the wall: 15 and 30 - distance between the top of the chamber and the

top of the stud: 15 mm.

  - radius of curvature of the top of the chamber: 15mm

- height: between 30 and 100 mm.

7. Plot according to any one of

  claims 1 to 6, characterized in that it is

molded polyethylene.