FR3084001A1 - DAMPING DEVICE FOR PNEUMATIC PERFORATOR - Google Patents

Abstract

The invention relates to a damping device (1) for a pneumatic perforator (2), comprising: - a first stop (11), - a second stop (12), - at least two guide bars (13, 14) fixed between the first and second stops, - a gripping member (15) comprising a plate comprising at least two through bores configured so that the guide bars slide there, and - two pairs of damping blocks each mounted on a share guide bar and on the other side of the gripping member. The plate extends mainly in a transverse direction (T) perpendicular to the longitudinal axis (L) of the pneumatic perforator (2) and the two grip handles extend opposite to each other from the plate and in the transverse direction (T).

Description

TECHNICAL FIELD OF THE INVENTION

The invention relates to the field of pneumatic punches. It relates more particularly to the field of vibration damping devices of a pneumatic perforator.

STATE OF THE ART

There are several cushioning devices for pneumatic punches.

In particular, the patent document US 1,902,530 relates to a damping device for rock puncher and aims to make it easily usable a perforating device, such as a hand drill or a rock drill of the jackhammer type, by opposing transmission of shocks and vibrations from the perforating device to the operator.

The damping device according to this patent document includes:

- A first stop intended to be fixed to the rear head of the perforator,

- a second stop intended to be fixed to the front head of the perforator,

- a pair of guide bars, the ends of which are firmly fixed between the first and second stops, extending along the perforator and being kept parallel to each other,

- a gripping member comprising a plate, a frame and gripping handles; the plate includes two through bores configured to closely receive a portion of the bars so that the latter can slide therein; the frame extends from the plate towards the rear head of the perforator by forming a slide for the rear stop of the damping device; the frame extends to the grips which are arranged horizontally above the rear stop of the damping device, and

- Two pairs of helical springs, each pair being mounted on a guide bar and each pair comprising a first spring maintained in compression between the first stop and the plate and a second spring maintained in compression between the second stop and the plate.

In operation, the perforator is thus arranged to be able to slide along the guide bars of the damping device, the springs damping the shocks and vibrations of the perforator and preventing their transmission to the operator who holds the gripping by its handles.

In operation, the jolts and shocks resulting from movements of the percussion element of the perforator or from other causes will be absorbed by the springs instead of being transmitted to the level of the grip handles.

This damping device is relatively heavy, which penalizes the maneuverability of the pneumatic perforation system comprising the damping device and the pneumatic perforator and therefore the precision of the perforation.

An object of the present invention is to provide a damping device for a pneumatic perforator making it possible to resolve all or part of the above-mentioned drawbacks.

Another object of the present invention is to provide a damping device for a pneumatic perforator making it possible to improve the comfort of the user and / or the precision of the perforation.

Another object of the present invention is to provide a damping device for a pneumatic perforator making it possible to improve the mechanical strength and / or the service life of a pneumatic perforating system comprising the damping device and the pneumatic perforator.

SUMMARY OF THE INVENTION

To achieve this objective, according to a first aspect, the present invention provides a damping device for a pneumatic perforator, the damping device comprising:

- a first stop,

a second stop capable of being fixed at, or even on, a rear head of the pneumatic perforator,

at least two guide bars fixed at least between the first and second stops so as to be able to be arranged along a longitudinal axis of the pneumatic perforator,

a gripping member comprising a plate and two gripping handles, the plate comprising at least two through bores, each through bore being configured to receive a portion of one of the guide bars so that this guide bar is able to slide in the through bore, and

- At least two pairs of damping blocks, each pair being mounted on a guide bar and each pair comprising a first damping block held between the first stop and the plate and a second damping block maintained between the second stop and the plate.

The damping device is essentially such that the plate extends mainly in a transverse direction perpendicular to the longitudinal axis of the pneumatic perforator and such that the two grips extend opposite each other from the plate, or even from opposite ends of the plate, and in said transverse direction.

The damping device thus makes it possible to limit, even eliminate, the transmission to the operator of the vibrations of the pneumatic perforator. It therefore improves the operator's comfort of use. Also, the device is adaptable to different types of pneumatic punches without modification of the latter. The damping device is additional equipment to the pneumatic perforator which does not deteriorate the performance of the latter. In particular, the center of gravity is lowered or kept advantageously low. In addition, the perforation efficiency even seems to have improved.

Optionally, the invention may also have at least any of the following characteristics, which can be implemented in combination or as an alternative:

- The first stop is located opposite the pneumatic perforator relative to the second stop;

- The damping blocks of the damping device are able to be arranged in the extension of the pneumatic perforator, or even above the rear head of the pneumatic perforator;

- each through bore may be arranged in conjunction with a bore reduction ring made of a thermostable, non-stick and / or soft material relative to the materials from which the plate and the guide bars are made. The vibrations of the pneumatic perforator are thus better damped, in particular without being reduced the sliding capacity of the guide bars in the bores of the plate;

at least one of the guide bars can extend, beyond the second stop and along the longitudinal axis of the pneumatic perforator, by an extension configured to cooperate with at least one fixing equipping a periphery of the pneumatic perforator, or even a circumference of a front head of the pneumatic perforator. The damping device thus offers a reinforced mechanical connection with the pneumatic perforator. In particular, the manipulations of the damping device by the operator are better transmitted to the pneumatic perforator whose control by the operator is thus improved. According to a first feature, the extension of at least one guide bar may include a front end provided with a groove configured to cooperate by clipping or screwing with the at least one fixing equipping the periphery of the pneumatic perforator. According to a second feature, and in a combined or alternative to the first feature, the extension of the at least one guide bar can be configured so that it can be inserted into a tube integral with the pneumatic perforator;

- The second stop may include at least one stop collar arranged on one of the guide bars. In addition, the extension of the at least one guide bar can be of a length such that its front end can be fixed to the at least one fixing equipping the periphery of the pneumatic perforator, when the stop collar of the 'at least one guide bar is in abutment on the rear head of the pneumatic perforator;

- The first stop may include at least one nut, preferably at least one cap nut, each nut being configured to be screwed to a threaded rear end of the at least one guide bar. More generally, the first stop may comprise at least one fixing configured to cooperate by clipping or screwing with a groove provided at a rear end with at least one guide bar;

- The first damper blocks are preferably identical to each other and the second damper blocks are preferably identical to each other. This ensures symmetrical damping of the vibrations of the pneumatic perforator. Even more preferably, all of the damper blocks are identical to each other. At rest, the plate thus extends halfway between the first and second stops; and

at least one damping block can comprise at least one helical spring in which one of the guide bars is housed, the through bores of the plate and the first and second stops being such that said at least one helical spring is in permanent support at the times on a periphery of one of the through bores and on one of the first and second stops.

According to a second aspect, the present invention relates to a pneumatic damping perforation system comprising a damping device as introduced above and a pneumatic perforator.

The other objects, characteristics and advantages of the present invention will appear on examining the following description and the accompanying drawings. It is understood that other advantages can be incorporated.

BRIEF DESCRIPTION OF THE FIGURES

The aims, objects, as well as the characteristics and advantages of the invention will emerge better from the detailed description of an embodiment of the latter which is illustrated by the following accompanying drawings in which:

FIGURE 1 shows a perspective view of a damped pneumatic perforation system comprising a damping device according to an embodiment of the invention and a pneumatic perforator.

FIGURE 2 is an enlargement of a rear portion of the air cushioned perforation system illustrated in Figure 1.

FIGURE 3 is a top view, from the rear, of the air cushioned perforation system illustrated in Figure 1.

FIGURE 4 is a sectional view along the axis A-A illustrated in Figure 4 of a rear portion of the pneumatic cushioning perforation system illustrated in Figure 1.

FIGURE 5 is a perspective view of a plate of a damping device according to an embodiment of the invention.

FIGS. 6A and 6B each represent a view of a guide bar of a damping device according to an embodiment of the invention.

FIGURE 7 schematically represents a situation of use by an operator of the pneumatic perforation system with damping illustrated in FIG. 1.

The drawings are given as examples and are not limitative of the invention. They constitute schematic representations of principle intended to facilitate the understanding of the invention and are not necessarily on the scale of practical applications.

DETAILED DESCRIPTION OF THE INVENTION

The term "front head" of a pneumatic perforator means the side of the pneumatic perforator at the level of which a perforating tool is arranged and works under pneumatic action to perforate a material such as a road surface for example.

The term "rear head" of a pneumatic puncher the side of a pneumatic puncher opposite the front head thereof.

FIG. 1 shows a perspective view of a pneumatic perforation system with damping 0 comprising a damping device 1 according to an embodiment of the invention and a pneumatic perforator 2.

The pneumatic perforator 2 is for example a jackhammer or a hammer-pestle. The pneumatic perforator 2 can be a Montabert® brand perforator, and in particular belonging to the T18 series or to the T21 series. However, it is understood that the damping device 1 is compatible with any pneumatic perforator 2, possibly at the cost of an adaptation, within the reach of a person skilled in the art, in particular its dimensioning, or even its relative arrangement.

The damping device 1 is for example essentially made of at least one metal alloy. Other materials can be envisaged provided that they allow the damping device 1 to fulfill its function.

The purpose of the damping device is to reduce vibrations in the operator's hands and arms, in particular so as not to exceed the threshold predetermined by the regulations in force.

With reference to FIG. 1, the damping device according to the illustrated embodiment comprises a first stop 11 and a second stop 12, two guide bars 13 and 14, a gripping member 15 and two pairs of damper blocks 16a, 16b and 17a, 17b.

As particularly illustrated in FIG. 2, the two guide bars 13, 14 are fixed between the first stop 11 and the second stop 12. They are thus held so as to be parallel to one another and advantageously oriented along a longitudinal axis L of the perforator pneumatic 2 when the damping device 1 cooperates or is arranged on the pneumatic perforator 2.

Referring to Figure 5, the gripping member 15 comprises a plate 151 having two through bores 1511, 1512. Each through bore is configured to receive a portion of one of the guide bars 13, 14 so that this bar guide is able to slide in the through bore. Each through bore 1511, 1512 can more particularly be arranged in conjunction with a bore reduction ring. Each reduction ring is preferably made of a thermostable, non-stick and / or soft material relative to the materials, preferably metallic, from which the plate and the guide bars are made. For example, the reduction rings are based on Teflon®. They help dampen the vibrations of the pneumatic perforator.

As illustrated in FIG. 2, each pair of damper blocks 16a, 16b and 17a, 17b is mounted on a guide bar. Each pair comprises a first damper block 16a, 17a held, for example in compression, between the first stop 11 and the plate 151 and a second damper block 16b, 17b maintained, for example in compression, between the second stop and the plate 151. The first damper blocks 16a, 17a as illustrated are substantially identical to each other. The second damper blocks 16b, 17b are also. Preferably, all of the damper blocks 16a, 16b, 17a, 17b are identical to each other.

The shock absorbing blocks 16a, 16b, 17a, 17b as illustrated in particular in FIG. 2 each comprise at least one helical spring. One of the guide bars 13, 14 is housed in each pair of helical springs. As a preferred example, the damping blocks according to the invention have a stiffness of between 60 shore and 80 shore, advantageously 70 shore. This stiffness selection for the shock absorber blocks makes it possible to ensure a compromise between the damping effect of the vibrations of the pneumatic perforator and sufficient resistance to correctly transmit the force of the user on the perforator and ensure precision of the movements of the user. As a preferred example, the damper blocks according to the invention exhibit stability over a temperature range from -50 ° C. to + 80 ° C. As a preferred example, the shock absorbing blocks are made of S.B.R materials for Styrene-butadiene-rubber belonging to the family of styrene polymers. The through bores 1511, 1512 of the plate 151 and the first and second stops 11, 12 are such that each helical spring is in permanent support both on a periphery of one of the through bores 1511, 1512 and on one of the first and second stops 11, 12. Washers can if necessary be placed at each end of the coil springs.

As illustrated in FIGS. 1 and 2, the damping device 1 is intended to be fixed to the pneumatic perforator 2 by fixing at the second stop 12 to the rear head 21 of the pneumatic perforator 2.

By construction, it appears that the plate 151 mainly extends in a transverse direction T perpendicular to the longitudinal axis L of the pneumatic perforator 2.

As illustrated in particular in FIG. 4, the first stop 11 is situated opposite the pneumatic perforator 2 relative to the second stop 12. The damping device 1 is thus arranged at least partly in the extension of the pneumatic perforator 2 More particularly, the damping blocks 16a, 16b, 17a and 17b of the damping device 1 are arranged in the extension of the pneumatic perforator 2, above the rear head 21 of the pneumatic perforator 2. In addition, the device damping is configured to be arranged so that its central axis coincides with the longitudinal axis L of the pneumatic perforator. This ensures easy handling and unmodified compared to the basic pneumatic perforator.

In another way, the centers of gravity are advantageously aligned on the longitudinal axis of the perforator.

The longitudinal axis L extends vertically from top to bottom and is formed by the intersection of the sagittal and frontal planes. It is perpendicular to the transverse plane. The sagittal plane is a vertical plane which passes through the midline of the perforator and divides it into two symmetrical parts, right and left, while the frontal plane is a vertical plane perpendicular to the sagittal plane which divides the perforator into two symmetrical parts, anterior (front) and posterior (rear).

By vertical is meant what is parallel to the direction of gravity given in particular by the plumb line and horizontal which is perpendicular to the vertical, the top and bottom being vertically opposite.

For the remainder of the description, the expression “top” and “bottom” or their derivatives is understood to mean a quality of relative positioning of the pneumatic perforator 2 or of the damping device 1 when the latter is installed in a functional manner, the “ top >> being oriented opposite the ground and the bottom >> oriented towards the ground. The upper end is at the top and the lower end is at the bottom.

In addition, the gripping member 15 comprises two gripping handles 152,153 which extend opposite one another from the ends 1513, 1514 of the plate and in the transverse direction T. The gripping handles are for example welded to the plate 151.

Thus, the damping means offered by the damping device 1 are essentially located above the rear head 21 of the pneumatic puncher 2. They are compact and robust, and of a consequently limited weight.

The damping device 1 thus makes it possible to limit, or even eliminate, the vibrations originating from the pneumatic perforator 2 in operation and felt by the operator. It therefore improves the comfort of use of the pneumatic perforator 2 by the operator. The operator manipulates the damping device 1 arranged on the pneumatic perforator as illustrated in FIG. 7.

The damping device 1 is additional equipment to the pneumatic perforator 2; it does not deteriorate the performance of the latter. In particular, the center of gravity is lowered or kept advantageously low. Indeed, the length of the portion of the guide bars 13, 14 capable of sliding in the through bores of the plate 151 can be between 50 and 120 millimeters, preferably between 70 and 100 millimeters; it is for example equal to 85 mm to within 10%.

Consequently, the pneumatic perforation system with damping 0 can have a length (along the longitudinal axis L of the pneumatic perforator 2) greater by a value between 80 mm and 200 mm, preferably between 100 mm and 150 mm, relative to the length of the pneumatic perforator 2. Thus, with regard to the standard dimensions of a pneumatic perforator 2, for example a total height from the point of the perforator to the rear head of between 80 and 110 cm. It appears that the length of the pneumatic perforator system with damping 0 is not significantly greater than the length of the pneumatic perforator 2. The same applies with respect to the weight of the assembly which remains significantly low relative to the weight pneumatic puncher. Typically, a guide bar has a weight of about 500 grams to 1 kg.

In addition, the perforation efficiency seems to have improved. In fact, improving the operator's comfort when handling the pneumatic perforator 2 via the damping device 1 according to the invention allows better control of the perforation, in particular by better transmission of the forces provided by the operator. These elements allow drilling that is better guided, more straight and therefore easier to equip at the end of the operation with anchor bars or any other device that can be introduced into this type of drilling (mining drilling, passive anchoring drilling, etc.). .)

Furthermore, the damping device 1 is advantageously devoid of part intended for damping vibrations by its deformation in torsion and / or in bending; in fact, the vibrations are damped by the damping blocks 16, 17 which are by construction arranged along the longitudinal axis of the pneumatic perforator 2.

With reference to FIGS. 1, 6A and 6B, at least one of the guide bars 13, 14, preferably each guide bar, extends beyond the second stop 12 and along the longitudinal axis L of the pneumatic perforator 2. It thus has an extension 131, 141 which is more particularly configured to cooperate with at least one attachment 23, 24 fitted to a periphery of the pneumatic perforator 2, or even a periphery of a front head 22 of the pneumatic perforator 2.

The damping device 1 thus offers a reinforced mechanical connection with the pneumatic perforator 2. In particular, the manipulations of the damping device 1 by the operator are better transmitted to the pneumatic perforator 2 whose control by the operator is thus still improved.

According to a first feature, the extension 131, 141 of each guide bar 13, 14 may include a front end 131a, 141a provided with a groove 1311, 1411 configured to cooperate, by clipping or screwing, with one of the fasteners 23, 24 fitted around the pneumatic perforator. According to a second feature, and in combination or as an alternative to the first feature, the extension 131, 141 of each guide bar 13, 14 can be configured so that it can be inserted into a tube 25, 26 of the pneumatic perforator 2 .

Consequently, it appears that the mounting of the damping device 1 on the pneumatic perforator 2 is advantageously simple. It consists in particular of concomitantly inserting the guide bars 13, 14 by their respective extension 131, 141 in each of the integral tubes 25, 26 of the pneumatic perforator 2, until allowing the end 1311, 1411 of each extension 131, 141 to engage one of the fasteners 23, 24 fitted around the pneumatic perforator 2.

In this configuration in particular, the second stop 12 advantageously comprises at least one stop collar 121 arranged on one of the guide bars 13, 14. More particularly, the second stop 12 comprises two stop collars 121 respectively arranged on each of the two bars guide 13, 14. For example, each stop collar 121 can be formed from the guide bar on which it is arranged or be fixed thereon. If necessary, weld beads are used to connect each side of a stop collar 121 to the corresponding guide bar.

The extension 131, 141 of each guide bar 13, 14 is of a length such that its front end 131a, 141a can be fixed to the corresponding fixing 23, 24, when the stop collar 121 is in stop on the head rear 21 of the pneumatic perforator 2. By means of each guide bar, an effort to maintain the pressure of the second stop 12 against the rear head 21 of the pneumatic perforator 2 can even be printed by the end fixing means before 131a, 141a of each bar to the corresponding fixing 23, 24. This ensures that there is no play between the rear head 21 of the pneumatic perforator 2 and the second stop 12 of the damping device 1.

The abutment collars 121 make it possible on the one hand to limit the sliding of the extensions 131, 141 of the guide bars 13, 14 in the integral tubes 25, 26 around the circumference of the pneumatic perforator 2, when the damping device 1 is mounted on the rear head 21 of the pneumatic perforator 2, and on the other hand allow each to constitute a stop for each of the two second shock absorbing blocks 16b, 17b.

The extensions 131, 141 of the guide bars 13, 14 can extend over a length of between 200 and 500 millimeters; they are for example of a length equal to 300 mm to within 10%. The cross section of each guide bar is potentially 15 to 30 mm in diameter. Each stop collar 121 represents a local excess thickness of the diameter of the guide bar on which it is arranged. Typically, the additional thickness represented by each stop collar is between 1 and 10 mm and extends over 10 to 15 mm of the length of the guide bar.

As particularly well illustrated in Figures 3 and 4, the first stop 11 comprises at least one nut 111, preferably at least one blind nut. Each nut 111 is configured to be screwable to a rear end 131b, 141b threaded with a guide bar 13, 14.

Consequently, it appears that the complete mounting of the damping device 1 is relatively simple and can be carried out independently of its mounting on the pneumatic perforator 2.

Note that, in particular in the illustrated embodiment where the guide bars have extensions 131, 141 secured to the periphery of the pneumatic perforator 2, the arrangement of the damping device 1 on the pneumatic perforator 2 is sufficiently robust and reliable to avoid any need to reinforce the mechanical connection between the damping device and the pneumatic perforator, and to avoid in particular having to have a frame connecting the base of the damping means to their upper parts to strengthen the mechanical strength of the together.

According to a second aspect, the invention also relates to a pneumatic perforation system with damping 0 comprising a damping device 1 as described above and a pneumatic perforator 2.

It appears from the above that the damping device 1 according to the invention makes it possible to improve the mechanical strength and / or the life of the pneumatic perforation system which incorporates it.

The invention is not limited to the embodiments previously described and extends to all the embodiments covered by the claims.

For example, according to an embodiment different from that illustrated in the figures, and for all that envisaged, the shock absorbing blocks comprise silentblocks for example made from polyurethane.

For example, the guide bars 13, 14 may be of square or rectangular section.

REFERENCES

0. Pneumatic cushioning perforation system

1. Damping device

2. Pneumatic perforator

11. First stop

111. Nut

12. Second stop

121. Stop collar

13. Guide bar

131. Extension

131a. Front end

131b. Rear end

1311. Groove

14. Guide bar

141. Extension

141a. Front end

141b. Rear end

1411. Groove

15. Gripper

151. Plate

1511. Through bore

1512. Through bore

152. Grip handle

153. Grip handle

16. Shock absorber block

16a. First shock absorber block

16b. Second shock absorber block

17. Shock absorber block

17a. First shock absorber block

17b. Second shock absorber block

21. Back puncher head

22. Front head of the perforator

23. Fixing

24. Fixing

25.

Solid tube

26. Solid tube

T. Cross direction

L. Longitudinal axis

Claims (12)

1. Damping device (1) for pneumatic perforator (2), the damping device comprising: - a first stop (11), a second stop (12) capable of being fixed at, or even on, a rear head (21) of the pneumatic perforator (2), - at least two guide bars (13, 14) fixed at least between the first and second stops (11, 12) so as to be able to be arranged along a longitudinal axis (L) of the pneumatic perforator (2), - a gripping member (15) comprising a plate (151) and two gripping handles (152, 153), the plate (151) comprising at least two through bores (1511, 1512), each through bore (1511, 1512) being configured to receive a portion of one of the guide bars (13, 14) so that this guide bar is able to slide in the through bore, and - at least two pairs of damping blocks (16a, 16b, 17a, 17b), each pair being mounted on a guide bar (13, 14) and each pair comprising a first damping block (16a, 17a) held between the first stop (11) and the plate (151) and a second damping block (16b, 17b) held between the second stop (12) and the plate (151), characterized in that the plate (151) extends mainly in a direction transverse (T) perpendicular to the longitudinal axis (L) of the pneumatic perforator (2) and in that the two grip handles (152, 153) extend opposite one another from the plate and in said transverse direction (T). 2. Damping device (1) according to the preceding claim, in which the first stop (11) is located opposite the pneumatic perforator (2) relative to the second stop (12). 3. damping device (1) according to any one of the preceding claims, in which the damping blocks (16a, 16b, 17a and 17b) of the damping device (1) are able to be arranged in the extension of the perforator. pneumatic (2), or even above the rear head (21) of the pneumatic perforator (2). 4. Damping device (1) according to any one of the preceding claims, in which at least one of the guide bars (13, 14) extends beyond the second stop (12) and according to the longitudinal axis (L) of the pneumatic perforator (2), by an extension (131, 141) configured to cooperate with at least one fixing (23, 24) equipping a periphery of the pneumatic perforator (2), even a periphery of a front head (22) of the pneumatic perforator (2). 5. Damping device (1) according to the preceding claim, wherein the extension (131, 141) of at least one guide bar (13, 14) comprises a front end (131a, 141a) provided with 'A groove (1311, 1411) configured to cooperate by clipping or screwing with the at least one fixing (23, 24) equipping the periphery of the pneumatic perforator (2). 6. Damping device (1) according to any one of the two preceding claims, in which the extension (131, 141) of the at least one guide bar (13, 14) is configured so that it can be inserted into an integral tube (25, 26) of the pneumatic perforator (2). 7. Damping device (1) according to any one of the preceding claims, in which the second stop (12) comprises at least one stop collar (121) arranged on one of the guide bars (13, 14). 8. Damping device (1) according to the three preceding claims, in which the extension (131, 141) of the at least one guide bar (13, 14) is of a length such that its front end ( 131a, 141a) can be fixed to the at least one fixing (23, 24) equipping the periphery of the pneumatic perforator (2), when the stop collar (121) of the at least one guide bar (13, 14 ) is in abutment on the rear head (21) of the pneumatic perforator (2). 9. Damping device (1) according to any one of the preceding claims, in which the first stop (11) comprises at least one nut (111), preferably at least one blind nut, each nut (111) being configured to be screwed to a rear end (131b, 141b) threaded from the at least one guide bar (13, 14). 10. Damping device (1) according to any one of the preceding claims, in which the first damping blocks (16a, 17a) are identical to each other and the second damping blocks (16b, 17b) are identical to each other, preferably all the damping blocks (16a, 16b, 17a, 17b) are identical to each other. 11. Damping device (1) according to any one of the preceding claims, in which at least one damping block (16a, 16b, 17a, 17b) comprises at least one helical spring in which one of the guide bars (13, 14) is housed, the through bores (1511, 1512) of the plate (151) and the first and second stops (11, 12) being such that said at least one helical spring is in permanent support both on a periphery of 'one of the through bores (1511, 1512) and on one of the first and second stops (11,12). 12. Pneumatic damping perforation system (0) comprising a damping device (1) according to any one of the preceding claims and a pneumatic perforator (2).