EP0274957A1 - Fastening tool acting via an intermediate anvil - Google Patents

Fastening tool acting via an intermediate anvil Download PDF

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Publication number
EP0274957A1
EP0274957A1 EP87402935A EP87402935A EP0274957A1 EP 0274957 A1 EP0274957 A1 EP 0274957A1 EP 87402935 A EP87402935 A EP 87402935A EP 87402935 A EP87402935 A EP 87402935A EP 0274957 A1 EP0274957 A1 EP 0274957A1
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EP
European Patent Office
Prior art keywords
ring
piston
rigid
elastic
guide
Prior art date
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Granted
Application number
EP87402935A
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German (de)
French (fr)
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EP0274957B1 (en
Inventor
Roland Almeras
Jean-Claude Vernerey
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Societe de Prospection et dInventions Techniques SPIT SAS
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Societe de Prospection et dInventions Techniques SPIT SAS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/08—Hand-held nailing tools; Nail feeding devices operated by combustion pressure
    • B25C1/10—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge
    • B25C1/14—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge acting on an intermediate plunger or anvil

Definitions

  • the present invention relates to an indirect fire sealing apparatus, comprising a piston mounted in a barrel for, under the action of the combustion gases of a propellant charge, driving a pad for fixing a part on a support, means piston damping being provided between the barrel and a buffer guide disposed in front of the barrel, to absorb the excess propulsion energy of the piston and limit its stroke, the damping means comprising in combination, a ring, shaped to cooperate with the piston head, a first intermediate ring, of elastic material, disposed between the cooperation ring with the piston head and the buffer guide, and a second intermediate ring, of rigid but slightly deformable material, displaceable axially between the cooperation ring with the piston head and the buffer guide.
  • Sealing devices of this type are often used for cladding buildings, such as hangars. It is, for example, and using short buffers, to fix cladding sheets on section beams, for example in I.
  • the thicknesses of the support materials for receiving the fixing buffers are variable from one material to another, and it is necessary to ensure the regularity of the insertion of the pads in these materials.
  • I-beams to be covered with thin sheets, it often happens that operators work blindly, without knowing if they are pulling in the soul of the beams, in their thin side wings, or even next to it.
  • the buffers could be too deep, which would be detrimental to the quality of the fixing, but if it is next to it, they could cross the thin sheets like a real projectile animated with a still high speed, if the sealing device was precisely not provided with the damping means of the piston which limit its stroke, not to mention the devices which are based on the absorption of the excess power by the depression of the buffer itself, and in which the piston may protrude out of the stamp guide.
  • the damper of the piston is therefore intended to limit, or control, the stroke. Indeed, it is sufficient to ensure the position of the piston at the moment when, so to speak, it releases the tampon, because at this moment, the kinetic energy of the tampon represents only a very small portion of the energy propulsion, insufficient for it to continue its driving course. In other words, as soon as the tampon is released by the piston, it stops.
  • shock absorber Several types are already known, non-elastic steel rings, on the one hand, and rings made of elastic material, for example polyurethane, on the other hand.
  • Steel rings offer the advantage of good driving precision, but they have the disadvantage of increasing the risk of the piston breaking by sudden stop.
  • the elastic rings do not have this drawback. But due to the fact that they are stressed in a large and frequent manner, they deform and even fall apart to the detriment of the precision of positioning of the piston and of the functioning of the tool.
  • the present invention therefore aims to provide an indirect firing sealing apparatus, in which the axial position of the piston, after firing, is always the same.
  • the present invention relates to an indirect firing sealing apparatus of the type mentioned above, characterized in that the buffer guide and the second rigid intermediate ring are arranged so that the length of the axial displacement of the latter is equal to the decrease in the axial dimension of the elastic intermediate ring after compression.
  • the ring of cooperation with the piston head can start to absorb a certain part of the propulsion energy, by shrinking, before moving forward and compressing the first elastic intermediate ring between it and the tip guide, without risk of causing the piston to break.
  • the first elastic intermediate ring first serves to limit the forward movement of the cooperation ring with the piston head.
  • This first elastic intermediate ring also behaves like a compression spring with turns.
  • the second rigid intermediate ring coming to bear against the buffer guide, provides a stop function to prevent this so-called spring from coming into contiguous turns.
  • the rigid intermediate ring makes it possible to control the deformation of the elastic intermediate ring and prevents the latter from being disintegrated by excessive crushing.
  • the rigid intermediate ring collects the excess energy which has not already been absorbed by the elastic intermediate ring.
  • the rigid intermediate ring but slightly deformable, protects the elastic ring which can thus regain all its characteristics, even after numerous dampings of the piston, which is beneficial to the precision of the positioning of the piston.
  • the buffer guide comprises a rear recess for receiving the second rigid intermediate ring of axial depth at least equal to the reduction in the axial dimension of the elastic intermediate ring after compression.
  • the axial dimension of the two intermediate rings is the same.
  • the association of two rings of the same axial dimension has the advantage of a simplification of assembly, by not being obliged to respect a positioning and a direction of assembly.
  • the two rings represent an inseparable damping assembly which is easily interchangeable, and which can give all the guarantees of positioning of the piston, when the latter reaches the end of the stroke, and which therefore makes it possible to always obtain a quality fixing.
  • the cooperation ring with the piston head is made of rigid material.
  • an annular space is provided around the two intermediate rings to allow, under the action of the displacement of the cooperation ring with the piston head, the swelling of the first intermediate ring in elastic material, until the second intermediate ring of rigid and deformable material abuts against the rear bottom of the tip guide.
  • the length of the axial displacement of the rigid intermediate ring and the volume of the space surrounding the two intermediate rings can be such that, at the end of the deformation phase of the elastic intermediate ring, when the rigid intermediate ring abuts against the rear bottom of the tip guide, said volume is not zero.
  • the piston head is hollowed out to receive the load carrier, whereby the robustness of the piston remains preserved despite the reduction in its weight which, for its part, is conducive to its good damping.
  • the sum of the axial lengths of the elastic intermediate ring, in its compressed state, and of the buffer guide, on the one hand, as well as the length of the front part of the piston intended to protrude from the elastic intermediate ring, on the other hand, are such that the front end of the piston, after firing, does not protrude out of the buffer guide.
  • the piston head of the apparatus of the invention is frustoconical, therefore of large surface area, and the ring for cooperation with the piston head has a bore of corresponding shape, which offers the best solution to the problem. of the depreciation applied.
  • the sealing device which will be described is used above all to fix parts 1, such as cladding sheets, on supports 2, such as hangar beams, using buffers which are advantageously in the form of nails with short rods. 3 and big-headed 4.
  • the apparatus of the invention therefore comprises a barrel block 5, in fact a barrel 51 proper and a load carrier 52 integral with the barrel, in which is mounted, for sliding axially, a piston, or counterweight, 6, and a buffer guide 7.
  • a shoulder spacer 8, integral with the buffer guide 7, comprises, at the rear, an internal annular rim 9 intended to cooperate with an external annular rim 10 which is provided, at the front, with the barrel 51 , so that, when opening the device after a shot and before loading a new propellant charge, the drive of the buffer guide 7 forwards drives with it the barrel block 5, while allowing , at the time of the firing and under the action of the exhaust gases, the retraction of the barrel 51 until its front edge 10 comes into abutment against the rear edge 9 of the spacer 8.
  • the piston 6 comprises a head 11 and a rod 12.
  • the head 11 comprises an annular rear part 13, hollowed out to receive, in the closed position of the apparatus and therefore ready for firing, the load carrier 52, and a front part 14 frustoconical, flared towards the rear, having a relatively large surface 15.
  • the rear of the piston head 11 has an external flange 16, by which the piston 6 slides in the barrel 5, and which is intended to cooperate with a retaining pawl 17 secured to the barrel holder, not shown, in which the barrel is slidably mounted, the pawl 17 being able to slide in a slot 53 formed in the barrel.
  • a retaining pawl 17 secured to the barrel holder, not shown, in which the barrel is slidably mounted, the pawl 17 being able to slide in a slot 53 formed in the barrel.
  • the load carrier 52 the front part of which is therefore intended to engage in the rear recess of the piston and in which a nozzle 19 for the propulsion gases is formed, comprises a rear part intended to receive, in a combustion chamber, a propellant charge 20 intended to be struck by a striker carried by the cylinder head of the device.
  • An internal frustoconical bore 23 is formed in the ring 22, of shape complementary to that of the front part 14 of the piston head.
  • a second intermediate ring 27 also in the form of a sleeve and of rigid but slightly deformable material, of external diameter equal to the internal diameter of the uncompressed ring 24, of internal diameter slightly greater than the diameter of the rod 12 of the piston, and, here, of axial length equal to that of the uncompressed ring 24.
  • the ring 27 is here made of steel, the resistance of which is between 500 and 650 N / m2 and the relative elongation between 15% and 25%.
  • the recess 25 has, in this embodiment, a slightly frustoconical side wall converging towards the front, to better receive the ring 27 and ensure better absorption, further progressive, of the excess energy, the ring coming to marry the wall of the recess.
  • a central bore 28 for receiving the buffer is formed in the buffer guide 7, from its front end face 29, of diameter greater than that of the central bore 26 for passage of the piston rod and into which the central bore opens. rear 26.
  • the sum of the axial lengths of the rigid ring 22, of the compressed intermediate elastic ring 24, and of the buffer guide 7, is slightly greater than the sum of the lengths axial of the frustoconical part 14 of the head and of the rod 12 of the piston 6. Or, the lengths of all these parts are such that the piston 6 cannot protrude outside the buffer guide 7.
  • the arming of the device and the firing are carried out in one case as in the other quite normally.
  • the piston 6 is propelled forward by driving the buffer 4 in the part 1; the frustoconical part 14 of the head abuts against the corresponding bore 23 of the rigid ring 22 ( Figure 2).
  • the rigid ring 22 moves forward, compressing the elastic ring 24 between the front face 30 of the rigid ring 22 and the rear face 31 of the buffer guide 7, the space annular 32, formed around the ring 24, allowing the elastic ring 24 to swell, and by moving the second deformable intermediate ring 27 in the recess 25 in the rear part of the buffer guide 7 (FIG. 3).
  • the energy residue is transmitted by the ring 27 to the buffer guide 7 bearing on the part 1.
  • the axial depth of the recess 25 and the volume of the space 32 are such that at the end of the deformation phase of the elastic ring 24, when the rigid ring 27 abuts against the bottom of the recess 25, the volume of the space 32 has been reduced but is not zero, to avoid constraining the spacer 8.
  • the second rigid intermediate ring 27 under the action of the energy transmitted by the piston, gradually deforms by compression between the front face 30 of the rigid ring 22 and the bottom of the recess 25 of the buffer guide, so that when the device is no longer new, the energy residue is transmitted to the buffer guide only after an axial displacement of the rigid ring 22 slightly greater than the depth of the recess 25.
  • the ring 27 no longer deforms.
  • the axial dimension of the rigid intermediate ring 27 could, in the new state, be smaller than that of the elastic intermediate ring 24, in its uncompressed state, which would avoid having to spare the recess 25 for receiving the ring 27 at the rear of the buffer guide 7.
  • the buffer guide 7 is then either propelled forward if, at the location considered, the support is not under the part, that is to say if it can deform under stress, i.e. the whole device, with the exception initially of the buffer guide and the spacer, moves back under the action of the exhaust gases, the rim 10 of the barrel 51 leaving the rear face of the rigid ring 22 to come into abutment against the rim 9 of the spacer 8 (FIG. 3).
  • the annular space 33 existing between the two flanges 9 and 10, just before firing, aims to allow relative movement of the barrel 51 and the piston 6 and thus avoid a brutal shock at the time of the damping of the piston which can cause inertia parts ruptures.
  • the front end of the rod 12 of the piston 6 remains, here, in relation to the front face 29 of the buffer guide 7. Even if the apparatus is used to pull, so to speak, in a vacuum, that is to say on a thin piece to be fixed in a place where it is not applied on its support, the piston remains inside the device. It is a guarantee of security and quality of the binding.
  • a shock-absorbing device comprising a single rigid monobloc ring 22 and a single elastic monobloc ring 24. It would not be departing from the scope of the present invention to provide, instead of one, several rigid rings and, also instead of 'one, several elastic rings. Similarly, the elastic ring 24 could no longer be outside but inside the rigid deformable ring 27, the recess for receiving the rigid ring, when it is provided, then becoming annular.
  • the ring 22 being able to swell a little, it is preferable that its outside diameter be slightly less than the inside diameter of the spacer 8.
  • the ring 22 must remain guided, we will then spare, on the front part of the ring, a centering and guiding shoulder with an outside diameter substantially equal to the inside diameter of the spacer 8.
  • the opening angle of the frustoconical part 14 of the piston head, and of the corresponding bore 23 of the ring 22, is advantageously between 13 ° and 20 °, and preferably substantially equal to 15 °.
  • the axial dimension of the rigid intermediate ring 27 ⁇ could, in new condition, be greater than that of the elastic intermediate ring 24 ⁇ , in its uncompressed state, provided that the rear recess 25 ⁇ of the guide- pad 7 ⁇ receiving the ring 27 ⁇ is dimensioned accordingly and allows the axial displacement of the ring 27 ⁇ over a length equal to the decrease in the axial dimension of the elastic ring 24 ⁇ after compression ( Figure 4).
  • the axial dimension of the recess 25 ⁇ still remains equal to the difference between the axial dimension of the ring 27 ⁇ and that of the ring 24 ⁇ in its compressed state.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Saccharide Compounds (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Ventilation (AREA)
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  • Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
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  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
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Abstract

L'appareil comprend un canon (51), un piston (6), coulis­sant dans le canon, pour entraîner un tampon (3) logé dans un guide-tampon (7). Entre le canon (51) et le guide-­tampon (7) sont disposées une bague rigide (22) et une bague élastique (24). A l'intérieur de la bague élastique (24) est disposée une bague rigide (27) de limitation de la course de la bague (22) destinée à être reçue dans un évi­dement (25) ménagé à l'arrière du guide-tampon (7). La tête (14) du piston est tronconique et peut coopérer avec un alésage (23) de forme correspondante dans la bague rigide (22). Les bagues servent d'amortisseur pour le piston (6) dont la course est ainsi contrôlée.The apparatus comprises a barrel (51), a piston (6), sliding in the barrel, for driving a tampon (3) housed in a tampon guide (7). Between the barrel (51) and the buffer guide (7) are arranged a rigid ring (22) and an elastic ring (24). Inside the elastic ring (24) is arranged a rigid ring (27) for limiting the stroke of the ring (22) intended to be received in a recess (25) formed at the rear of the buffer guide ( 7). The head (14) of the piston is frustoconical and can cooperate with a bore (23) of corresponding shape in the rigid ring (22). The rings serve as shock absorbers for the piston (6), the stroke of which is thus controlled.

L'appareil sert surtout au bardage de bâtiments.

Figure imgaf001
The device is mainly used for cladding buildings.
Figure imgaf001

Description

La présente invention concerne un appareil de scellement à tir indirect, comprenant un piston monté dans un canon pour, sous l'action des gaz de combustion d'une charge propulsive, entraîner un tampon de fixation d'une pièce sur un support, des moyens d'amortissement du piston étant prévus entre le canon et un guide-tampon disposé en avant du canon, pour absorber l'excédent de l'énergie de propul­sion du piston et limiter sa course, les moyens amortisseurs comprenant en combinaison, une bague, conformée pour coopé­rer avec la tête du piston, une première bague intermé­diaire, en matériau élastique, disposée entre la bague de coopération avec la tête de piston et le guide-tampon, et une deuxième bague intermédiaire, en matériau rigide mais légèrement déformable, déplaçable axialement entre la bague de coopération avec la tête de pistion et le guide-­tampon.The present invention relates to an indirect fire sealing apparatus, comprising a piston mounted in a barrel for, under the action of the combustion gases of a propellant charge, driving a pad for fixing a part on a support, means piston damping being provided between the barrel and a buffer guide disposed in front of the barrel, to absorb the excess propulsion energy of the piston and limit its stroke, the damping means comprising in combination, a ring, shaped to cooperate with the piston head, a first intermediate ring, of elastic material, disposed between the cooperation ring with the piston head and the buffer guide, and a second intermediate ring, of rigid but slightly deformable material, displaceable axially between the cooperation ring with the piston head and the buffer guide.

On utilise souvent des appareils de scellement de ce type pour le bardage de bâtiments, tels que des hangars. Il s'agit, par exemple, et à l'aide de tampons courts, de fixer des tôles de revêtement sur des poutrelles à section par exemple en I. De façon générale, les épaisseurs des maté­riaux supports de réception des tampons de fixation sont variables d'un matériau à un autre, et il faut s'assurer de la régularité de l'enfoncement des tampons dans ces maté­riaux. Pour reprendre l'exemple des poutrelles en I, à recouvrir de tôles de faible épaisseur, il arrive fréquemment que les opérateurs travaillent à l'aveuglette, sans savoir si ils tirent dans l'âme des poutrelles, dans leurs ailes latérales de faible épaisseur, ou même à côté. Si c'est dans les ailes, les tampons risqueraient d'être trop enfon­cés, ce qui serait préjudiciable à la qualité de la fixation, mais si c'est à côté, ils pourraient traverser les tôles de faible épaisseur à la manière d'un véritable projectile animé d'une vitesse encore importante, si l'appareil de scellement n'était précisément pas pourvu des moyens d'amortissement du piston qui limitent sa course, sans parler des appareils qui sont basés sur l'absorption de l'excédent de puissance par l'enfoncement du tampon lui-même, et dans lesquels le piston peut faire saillie hors du guide-tampon.Sealing devices of this type are often used for cladding buildings, such as hangars. It is, for example, and using short buffers, to fix cladding sheets on section beams, for example in I. In general, the thicknesses of the support materials for receiving the fixing buffers are variable from one material to another, and it is necessary to ensure the regularity of the insertion of the pads in these materials. To use the example of I-beams, to be covered with thin sheets, it often happens that operators work blindly, without knowing if they are pulling in the soul of the beams, in their thin side wings, or even next to it. If it is in the wings, the buffers could be too deep, which would be detrimental to the quality of the fixing, but if it is next to it, they could cross the thin sheets like a real projectile animated with a still high speed, if the sealing device was precisely not provided with the damping means of the piston which limit its stroke, not to mention the devices which are based on the absorption of the excess power by the depression of the buffer itself, and in which the piston may protrude out of the stamp guide.

L'amortisseur du piston est donc destiné à en limiter, ou contrôler,la course. En effet, il est suffisant d'assurer la position du piston au moment où, pour ainsi dire, il largue le tampon, car à ce moment, l'énergie cinétique du tampon ne représente plus qu'une très faible portion de l'énergie de propulsion, insuffisante pour qu'il poursuive sa course d'enfoncement. En d'autres termes, dès que le tampon est largué par le piston, il s'arrête.The damper of the piston is therefore intended to limit, or control, the stroke. Indeed, it is sufficient to ensure the position of the piston at the moment when, so to speak, it releases the tampon, because at this moment, the kinetic energy of the tampon represents only a very small portion of the energy propulsion, insufficient for it to continue its driving course. In other words, as soon as the tampon is released by the piston, it stops.

On connaît déjà plusieurs types d'amortisseur, les bagues en acier non élastiques, d'une part, et les bagues en matériau élastique, par exemple en polyuréthane, d'autre part.Several types of shock absorber are already known, non-elastic steel rings, on the one hand, and rings made of elastic material, for example polyurethane, on the other hand.

Les bagues en acier offrent l'avantage d'une bonne précision d'enfoncement, mais elles présentent l'inconvénient d'accroî­tre les risques de rupture du piston par arrêt brutal. Les bagues élastiques ne présentent pas cet inconvénient. Mais du fait qu'elles sont sollicitées de façon importante et fréquente, elles se déforment et même se désagrègent au détriment de la précision de positionnement du piston et du fonctionnement de l'outil.Steel rings offer the advantage of good driving precision, but they have the disadvantage of increasing the risk of the piston breaking by sudden stop. The elastic rings do not have this drawback. But due to the fact that they are stressed in a large and frequent manner, they deform and even fall apart to the detriment of the precision of positioning of the piston and of the functioning of the tool.

Par le document US-A- 3 465 942, on connaît un appareil du type mentionné ci-dessus. Toutefois, dans l'appareil de ce document, la deuxième bague intermédiaire ne sert qu'à éviter le fluage de la première bague intermédiaire contre le piston. L'ensemble de ces deux bagues d'amortissement de ce document ne permet pas de fixer avec une très bonne précision la position axiale du piston après les tirs.Document US-A-3,465,942 discloses an apparatus of the type mentioned above. However, in the apparatus of this document, the second intermediate ring only serves to avoid the creep of the first intermediate ring against the piston. The combination of these two damping rings in this document does not make it possible to fix with very good precision the axial position of the piston after the shots.

La présente invention vise donc à proposer un appareil de scellement à tir indirect, dans lequel la position axiale du piston, après les tirs, soit toujours la même.The present invention therefore aims to provide an indirect firing sealing apparatus, in which the axial position of the piston, after firing, is always the same.

A cet effet, la présente invention concerne un appareil de scellement à tir indirect du type mentionné ci-dessus, caractérisé par le fait que le guide-tampon et la deuxième bague intermédiaire rigide sont agencés pour que la longueur du déplacement axial de celle-si soit égale à la diminution de la dimension axiale de la bague intermédiaire élastique après compression.To this end, the present invention relates to an indirect firing sealing apparatus of the type mentioned above, characterized in that the buffer guide and the second rigid intermediate ring are arranged so that the length of the axial displacement of the latter is equal to the decrease in the axial dimension of the elastic intermediate ring after compression.

La bague de coopération avec la tête de piston peut commen­cer à absorber une certain partie de l'énergie de propul­sion, par frettage, avant de se déplacer vers l'avant et de comprimer la première bague intermédiaire élastique entre elle et le guide-pointe, sans risque de provoquer la rupture du piston.The ring of cooperation with the piston head can start to absorb a certain part of the propulsion energy, by shrinking, before moving forward and compressing the first elastic intermediate ring between it and the tip guide, without risk of causing the piston to break.

La première bague intermédiaire élastique sert d'abord à limiter le déplacement vers l'avant de la bague de coopéra­tion avec la tête de piston. Cette première bague intermé­diaire élastique se comporte également comme un ressort de compression à spires. Et pour éviter que ce ressort ne se détériore, la deuxième bague intermédiaire rigide, venant en appui contre le guide-tampon, assure une fonction de butée pour éviter que ce soi-disant ressort ne vienne à spires jointives. En d'autres termes, la bague intermédiaire rigide permet de contrôler la déformation de la bague intermédiaire élastique et évite que cette dernière ne soit désagrégée par un écrasement excessif. La bague intermédiaire rigide encaisse le surplus d'énergie qui n'a pas déjà été absorbé par la bague intermédiaire élastique. En d'autres termes encore, la bague intermédiaire rigide, mais légèrement déformable, protège la bague élastique qui peut ainsi retrouver toutes ses caractéristiques, même après de nombreux amortissements du piston, ce qui est bénéfique à la précision du position­nement du piston.The first elastic intermediate ring first serves to limit the forward movement of the cooperation ring with the piston head. This first elastic intermediate ring also behaves like a compression spring with turns. And to prevent this spring from deteriorating, the second rigid intermediate ring, coming to bear against the buffer guide, provides a stop function to prevent this so-called spring from coming into contiguous turns. In other words, the rigid intermediate ring makes it possible to control the deformation of the elastic intermediate ring and prevents the latter from being disintegrated by excessive crushing. The rigid intermediate ring collects the excess energy which has not already been absorbed by the elastic intermediate ring. In other words, the rigid intermediate ring, but slightly deformable, protects the elastic ring which can thus regain all its characteristics, even after numerous dampings of the piston, which is beneficial to the precision of the positioning of the piston.

Au plan fonctionnel, on peut donc dire que les deux bagues intermédiaires ont la même dimension axiale dynamique.Functionally, we can therefore say that the two intermediate rings have the same dynamic axial dimension.

Dans la forme de réalisation préférée de l'appareil de l'in­vention, le guide-tampon comporte un évidement arrière de réception de la deuxième bague intermédiaire rigide de profondeur axiale au moins égale à la diminution de la dimension axiale de la bague intermédiaire élastique après compression.In the preferred embodiment of the apparatus of the invention, the buffer guide comprises a rear recess for receiving the second rigid intermediate ring of axial depth at least equal to the reduction in the axial dimension of the elastic intermediate ring after compression.

Dans ce cas, il est avantageux que la dimension axiale des deux bagues intermédiaire soit la même.In this case, it is advantageous that the axial dimension of the two intermediate rings is the same.

L'association de deux bagues de même dimension axiale pré­sent l'avantage d'une simplification du montage, du fait de ne pas être obligé de respecter un positonnement et un sens de montage. Les deux bagues représentent un ensemble d'amortissement indissociable qui est interchangeable facile­ment, et qui peut donner toutes les garanties de positionne­ment du piston, lorsque celui-ci arrive en fin de course, et qui permet donc d'obtenir toujours une fixation de qualité.The association of two rings of the same axial dimension has the advantage of a simplification of assembly, by not being obliged to respect a positioning and a direction of assembly. The two rings represent an inseparable damping assembly which is easily interchangeable, and which can give all the guarantees of positioning of the piston, when the latter reaches the end of the stroke, and which therefore makes it possible to always obtain a quality fixing.

De préférence, la bague de coopération avec la tête du pis­ton est en matériau rigide.Preferably, the cooperation ring with the piston head is made of rigid material.

Avantageusement, un espace annulaire est ménagé autour des deux bagues intermédiaires pour permettre, sous l'action du déplacement de la bague de coopération avec la tête de pis­ton, le gonflement de la première bague intermédiaire en matériau élastique, jusqu'à ce que la deuxième bague intermédiaire en matériau rigide et déformable vienne en butée contre le fond arrière du guide-pointe. Dans ce cas, la longueur du déplacement axial de la bague intermédiaire rigide et le volume de l'espace entourant les deux bagues intermédiaires peuvent être tels que, à l'issue de la phase de déformation de la bague intermédiaire élastique, au moment où la bague intermédiaire rigide vient en butée contre le fond arrière du guide-pointe, ledit volume n'est pas nul.Advantageously, an annular space is provided around the two intermediate rings to allow, under the action of the displacement of the cooperation ring with the piston head, the swelling of the first intermediate ring in elastic material, until the second intermediate ring of rigid and deformable material abuts against the rear bottom of the tip guide. In this case, the length of the axial displacement of the rigid intermediate ring and the volume of the space surrounding the two intermediate rings can be such that, at the end of the deformation phase of the elastic intermediate ring, when the rigid intermediate ring abuts against the rear bottom of the tip guide, said volume is not zero.

De préférence, la tête du piston est évidée pour recevoir le porte-charge, grâce à quoi la robustesse du piston reste préservée malgré la diminution de son poids qui, elle, est propice à son bon amortissement.Preferably, the piston head is hollowed out to receive the load carrier, whereby the robustness of the piston remains preserved despite the reduction in its weight which, for its part, is conducive to its good damping.

Avantageusement, la somme des longueurs axiales de la bague intermédiaire élastique, dans son état comprimé, et du guide-tampon, d'une part, ainsi que la longueur de la partie avant du piston destinée à faire saillie hors de la bague intermédiaire élastique, d'autre part, sont telles que l'ex­trémité avant du piston, après tir, ne fasse pas saillie hors du guide-tampon.Advantageously, the sum of the axial lengths of the elastic intermediate ring, in its compressed state, and of the buffer guide, on the one hand, as well as the length of the front part of the piston intended to protrude from the elastic intermediate ring, on the other hand, are such that the front end of the piston, after firing, does not protrude out of the buffer guide.

De préférence toujours, la tête du piston de l'appareil de l'invention est tronconique, donc de grande surface, et la bague de coopération avec la tête de piston comporte un alésage de forme correspondante, ce qui offre la solution le meilleure au problème de l'amortissement posé.Still preferably, the piston head of the apparatus of the invention is frustoconical, therefore of large surface area, and the ring for cooperation with the piston head has a bore of corresponding shape, which offers the best solution to the problem. of the depreciation applied.

L'invention sera mieux comprise à l'aide de la description suivante de la forme de réalisation préférée de l'appareil de scellement, en référence aux dessins annexés, sur lesquels :

  • - la figure 1 représente une vue schématique en coupe axiale de l'appareil de l'invention, avant un tir;
  • - la figure 2 représente l'appareil de la figure 1, avant compression de la première bague intermédiaire élastique;
  • - la figure 3 représente l'appareil de la figure 1, après le tir, et
  • - la figure 4 représente une variante de réalisation par rap­port à ceux de l'appareil de la figure 2, de moyens d'amor­tissement du piston.
The invention will be better understood with the aid of the following description of the preferred embodiment of the sealing apparatus, with reference to the appended drawings, in which:
  • - Figure 1 shows a schematic view in axial section of the apparatus of the invention, before a shot;
  • - Figure 2 shows the apparatus of Figure 1, before compression of the first elastic intermediate ring;
  • FIG. 3 represents the apparatus of FIG. 1, after firing, and
  • - Figure 4 shows an alternative embodiment compared to those of the device of Figure 2, of the piston damping means.

L'appareil de scellement qui va être décrit sert surtout à fixer des pièces 1, comme des tôles de revêtement, sur des supports 2, comme des poutrelles de hangard, à l'aide de tampons se présentant avantageusement sous forme de clous à tige courte 3 et à grosse tête 4.The sealing device which will be described is used above all to fix parts 1, such as cladding sheets, on supports 2, such as hangar beams, using buffers which are advantageously in the form of nails with short rods. 3 and big-headed 4.

Cet appareil, hormis ses éléments liés à l'invention elle-­même, étant au demeurant parfaitement connu de l'homme du métier, seuls ces derniers éléments seront décrits.This device, apart from its elements linked to the invention itself, being, moreover, perfectly known to those skilled in the art, only the latter elements will be described.

L'appareil de l'invention comprend donc un bloc canon 5, en fait un canon 51 proprement dit et un porte-charge 52 solidaire du canon, dans lequel est monté, pour coulisser axialement, un pistion, ou masselotte, 6, et un guide-tampon 7. Une entretoise épaulée 8, solidaire du guide-tampon 7, comporte, à l'arrière, un rebord annulaire interne 9 des­tiné à coopérer avec un rebord annulaire externe 10 dont est pourvu, à l'avant, le canon 51, pour que, lors de l'ouver­ture de l'appareil après un tir et avant le chargement d'une nouvelle charge propulsive, l'entraînement du guide-tampon 7 vers l'avant entraîne avec lui le bloc canon 5, tout en permettant, au moment du tir et sous l'action des gaz d'échap­pement, le recul de canon 51 jusqu'à ce que son rebord avant 10 vienne en butée contre le rebord arrière 9 de l'entre­toise 8.The apparatus of the invention therefore comprises a barrel block 5, in fact a barrel 51 proper and a load carrier 52 integral with the barrel, in which is mounted, for sliding axially, a piston, or counterweight, 6, and a buffer guide 7. A shoulder spacer 8, integral with the buffer guide 7, comprises, at the rear, an internal annular rim 9 intended to cooperate with an external annular rim 10 which is provided, at the front, with the barrel 51 , so that, when opening the device after a shot and before loading a new propellant charge, the drive of the buffer guide 7 forwards drives with it the barrel block 5, while allowing , at the time of the firing and under the action of the exhaust gases, the retraction of the barrel 51 until its front edge 10 comes into abutment against the rear edge 9 of the spacer 8.

Le piston 6 comporte une tête 11 et une tige 12. La tête 11 comporte une partie arrière annulaire 13, évidée pour recevoir, en position de fermeture de l'appareil et donc prêt au tir, le porte-charge 52, et une partie avant 14 tronconique, évasée vers l'arrière, présentant une surface 15 relativement étendue.The piston 6 comprises a head 11 and a rod 12. The head 11 comprises an annular rear part 13, hollowed out to receive, in the closed position of the apparatus and therefore ready for firing, the load carrier 52, and a front part 14 frustoconical, flared towards the rear, having a relatively large surface 15.

L'arrière de la tête 11 du piston comporte une collerette externe 16, par laquelle le piston 6 coulisse dans le canon 5, et qui est destinée à coopérer avec un cliquet de retenue 17 solidaire du porte-canon, non représenté, dans lequel le canon est monté coulissant, le cliquet 17 pouvant coulisser dans une fente 53 ménagée dans le canon. Lors de l'ouverture de l'appareil, après le tir, la collerette 16 du piston 6 reste en butée contre le cliquet 17, ce qui empêche le piston 6 d'être également entraîné vers l'avant. A cet égard, on notera qu'une gorge annulaire est ménagée dans la collerette 16 pour recevoir un jonc 18 destiné à coopérer par frottement avec l'alésage intérieur 21 du canon 51 et à maintenir ainsi le piston 6 en position de tir.The rear of the piston head 11 has an external flange 16, by which the piston 6 slides in the barrel 5, and which is intended to cooperate with a retaining pawl 17 secured to the barrel holder, not shown, in which the barrel is slidably mounted, the pawl 17 being able to slide in a slot 53 formed in the barrel. When opening the device, after firing, the collar 16 of the piston 6 remains in abutment against the pawl 17, which prevents the piston 6 from also being driven forward. In this regard, it will be noted that an annular groove is made in the collar 16 to receive a rod 18 intended to cooperate by friction with the internal bore 21 of the barrel 51 and thus to maintain the piston 6 in the firing position.

Le porte-charge 52, dont la partie avant est donc destinée à s'engager dans l'évidement arrière du piston et dans laquelle est ménagée une tuyère 19 d'arrivée des gaz de pro­pulsion, comporte une partie arrière destinée à recevoir, dans une chambre de combustion, une charge propulsive 20 destinée, elle, à être percutée par un percuteur porté par la culasse de l'appareil.The load carrier 52, the front part of which is therefore intended to engage in the rear recess of the piston and in which a nozzle 19 for the propulsion gases is formed, comprises a rear part intended to receive, in a combustion chamber, a propellant charge 20 intended to be struck by a striker carried by the cylinder head of the device.

Une bague annulaire 22 en matériau rigide, ici en acier, de diamètre externe égal sensiblement au diamètre interne de l'entretoise 8, est montée mobile en coulissement dans cette entretoise 8. Un alésage tronconique interne 23 est ménagé dans la bague 22, de forme complémentaire de celle de la partie avant 14 de la tête du piston. Entre la bague 22 et le guide-tampon 7 est disposé une première bague intermé­diaire 24, en forme de manchon et en matériau élastique, ici en polyuréthane, de diamètre externe inférieur au diamè­tre interne de l'entretoise 8, pour ménager un espace annulaire 32 pour son gonflement, et de diamètre interne supérieur au diamètre de la tige 12 du piston. Entre la bague 22 et le guide-tampon 7, toujours, mais au droit d'un évidement annulaire 25 creusé vers l'avant dans le guide-­tampon autour de son alésage central 26 de passage de la tige 12 du piston, et à l'intérieur de la bague 24, est dis­posée une deuxième bague intermédiaire 27, en forme de man­chon aussi et en matériau rigide mais légèrement déformable, de diamètre externe égal au diamètre interne de la bague 24 non comprimée, de diamètre interne légèrement supérieur au diamètre de la tige 12 du piston, et, ici, de longueur axiale égale à celle de la bague 24 non comprimée. La bague 27 est ici en acier, dont la résistance est comprise entre 500 et 650 N/m² et l'allongement relatif compris entre 15 % et 25 %.An annular ring 22 made of rigid material, here steel, with an external diameter substantially equal to the internal diameter of the spacer 8, is mounted to slide in this spacer 8. An internal frustoconical bore 23 is formed in the ring 22, of shape complementary to that of the front part 14 of the piston head. Between ring 22 and the buffer guide 7 is arranged a first intermediate ring 24, in the form of a sleeve and of elastic material, here in polyurethane, of external diameter less than the internal diameter of the spacer 8, to provide an annular space 32 for its swelling, and of internal diameter greater than the diameter of the piston rod 12. Between the ring 22 and the buffer guide 7, still, but in line with an annular recess 25 hollowed out in the front in the buffer guide around its central bore 26 for passage of the rod 12 of the piston, and at l inside the ring 24, is disposed a second intermediate ring 27, also in the form of a sleeve and of rigid but slightly deformable material, of external diameter equal to the internal diameter of the uncompressed ring 24, of internal diameter slightly greater than the diameter of the rod 12 of the piston, and, here, of axial length equal to that of the uncompressed ring 24. The ring 27 is here made of steel, the resistance of which is between 500 and 650 N / m² and the relative elongation between 15% and 25%.

L'évidement 25 présente, dans cette forme de réalisation, une paroi latérale légèrement tronconique convergente vers l'avant, pour mieux recevoir la bague 27 et assurer une meilleure absorption, en outre progressive, du surplus d'énergie, la bague venant épouser la paroi de l'évidement.The recess 25 has, in this embodiment, a slightly frustoconical side wall converging towards the front, to better receive the ring 27 and ensure better absorption, further progressive, of the excess energy, the ring coming to marry the wall of the recess.

Un alésage central 28 de réception de tampon est ménagé dans le guide-tampon 7, depuis sa face frontale avant 29, de diamètre supérieur à celui de l'alésage central 26 de passage de la tige de piston et dans lequel débouche l'alésage cen­tral arrière 26.A central bore 28 for receiving the buffer is formed in the buffer guide 7, from its front end face 29, of diameter greater than that of the central bore 26 for passage of the piston rod and into which the central bore opens. rear 26.

La somme des longueurs axiales de la bague rigide 22, de la bague élastique intermédiaire 24 comprimée, et du guide-­tampon 7, est légèrement supérieure à la somme des longueurs axiales de la partie tronconique 14 de la tête et de la tige 12 du piston 6. Ou encore, les longueurs de toutes ces pièces sont telles que le piston 6 ne puisse pas faire saillie hors du guide-tampon 7.The sum of the axial lengths of the rigid ring 22, of the compressed intermediate elastic ring 24, and of the buffer guide 7, is slightly greater than the sum of the lengths axial of the frustoconical part 14 of the head and of the rod 12 of the piston 6. Or, the lengths of all these parts are such that the piston 6 cannot protrude outside the buffer guide 7.

L'appareil ayant été décrit dans ses éléments structurels, le fonctionnement de ceux-ci va maintenant être abordé.The device having been described in its structural elements, the operation of these will now be discussed.

Ayant introduit, par la face avant 29, un clou-tampon 3, 4 dans l'alésage 28 du guide-tampon 7, on met l'appareil en appui contre la pièce à fixer 1. Alors, le guide-tampon 7, la bague élastique 24, la bague rigide 22 et le canon 51 par son rebord 10 sont en contact deux à deux, et le piston 6 est maintenu dans le canon 51, par son jonc 18, en posi­tion de tir, avec une charge 20 dans la chambre de combus­tion prête à être percutée.Having introduced, through the front face 29, a buffer nail 3, 4 into the bore 28 of the buffer guide 7, the apparatus is pressed against the part to be fixed 1. Then, the buffer guide 7, the elastic ring 24, the rigid ring 22 and the barrel 51 by its rim 10 are in pairs contact, and the piston 6 is held in the barrel 51, by its rod 18, in the firing position, with a load 20 in the combustion chamber ready to be struck.

Que l'appareil soit mis en appui sur la pièce à fixer en un endroit sous lequel se trouve le support, ou non, l'arme­ment de l'appareil et la mise à feu s'effectuent dans un cas comme dans l'autre tout à fait normalement. Sous l'ac­tion des gaz de propulsion, le piston 6 est propulsé vers l'avant en entraînant le tampon 4 dans la pièce 1; la partie tronconique 14 de la tête vient en butée contre l'alésage correspondant 23 de la bague rigide 22 (figure 2). En absor­bant une partie de l'énergie, la bague rigide 22 se déplace vers l'avant, en comprimant la bague élastique 24 entre la face avant 30 de la bague rigide 22 et la face arrière 31 du guide-tampon 7, l'espace annulaire 32, ménagé autour de la bague 24, permettant le gonflement de la bague élastique 24, et en déplaçant la deuxième bague intermédiaire déforma­ble 27 dans l'évidement 25 de la partie arrière du guide-­tampon 7 (figure 3).Whether the device is supported on the part to be fixed in a place under which the support is located, or not, the arming of the device and the firing are carried out in one case as in the other quite normally. Under the action of propellant gases, the piston 6 is propelled forward by driving the buffer 4 in the part 1; the frustoconical part 14 of the head abuts against the corresponding bore 23 of the rigid ring 22 (Figure 2). By absorbing part of the energy, the rigid ring 22 moves forward, compressing the elastic ring 24 between the front face 30 of the rigid ring 22 and the rear face 31 of the buffer guide 7, the space annular 32, formed around the ring 24, allowing the elastic ring 24 to swell, and by moving the second deformable intermediate ring 27 in the recess 25 in the rear part of the buffer guide 7 (FIG. 3).

Dès que la déformation de la bague élastique 24 et telle que sa dimension axiale a été réduite, au début de l'usage de l'appareil, de la profondeur axiale de l'évidement 25, et que la bague 27 vient en butée contre le fond de l'évi­dement 25, pour par conséquent limiter la déformation de la bague 24, le résidu d'énergie est transmis par la bague 27 au guide-tampon 7 en appui sur la pièce 1.As soon as the deformation of the elastic ring 24 and such that its axial dimension has been reduced, at the start of the use of the device, the axial depth of the recess 25, and that the ring 27 abuts against the bottom of the recess 25, to consequently limit the deformation of the ring 24, the energy residue is transmitted by the ring 27 to the buffer guide 7 bearing on the part 1.

On notera que la profondeur axiale de l'évidement 25 et le volume de l'espace 32 sont tels qu'à l'issue de la phase de déformation de la bague élastique 24, au moment où la bague rigide 27 vient en butée contre le fond de l'évidement 25, le volume de l'espace 32 a été réduit mais n'est pas nul, pour éviter de contraindre l'entretoise 8.It will be noted that the axial depth of the recess 25 and the volume of the space 32 are such that at the end of the deformation phase of the elastic ring 24, when the rigid ring 27 abuts against the bottom of the recess 25, the volume of the space 32 has been reduced but is not zero, to avoid constraining the spacer 8.

On notera qu'au fur et à mesure qu'on utilise l'appareil, la deuxième bague intermédiaire rigide 27, sous l'action de l'énergie transmise par le piston, se déforme petit à petit par compression entre la face avant 30 de la bague rigide 22 et le fond de l'évidement 25 du guide-tampon, si bien que quand l'appareil n'est plus neuf, le résidu d'énergie n'est transmis au guide-tampon qu'après un dépla­cement axial de la bague rigide 22 légèrement supérieur à la profondeur de l'évidement 25. Bien entendu, il arrive un moment où la bague 27 ne se déforme plus.It will be noted that as the apparatus is used, the second rigid intermediate ring 27, under the action of the energy transmitted by the piston, gradually deforms by compression between the front face 30 of the rigid ring 22 and the bottom of the recess 25 of the buffer guide, so that when the device is no longer new, the energy residue is transmitted to the buffer guide only after an axial displacement of the rigid ring 22 slightly greater than the depth of the recess 25. Of course, there comes a time when the ring 27 no longer deforms.

On remarquera encore que la dimension axiale de la bague intermédiaire rigide 27 pourrait, à l'état neuf, être plus petite que celle de la bague intermédiaire élastique 24, dans son état non comprimé, ce qui éviterait d'avoir à ména­ger l'évidement 25 de réception de la bague 27 à l'arrière du guide-tampon 7.It will also be noted that the axial dimension of the rigid intermediate ring 27 could, in the new state, be smaller than that of the elastic intermediate ring 24, in its uncompressed state, which would avoid having to spare the recess 25 for receiving the ring 27 at the rear of the buffer guide 7.

Le guide-tampon 7 est alors soit propulsé vers l'avant si, à l'endroit considéré, le support ne se trouve pas sous la pièce, c'est-à-dire si celle-ci peut se déformer sous l'effort, soit l'appareil tout entier, à l'exception dans un premier temps du guide-tampon et de l'entretoise, recule sous l'action des gaz d'échappement, le rebord 10 du canon 51 quittant la face arrière de la bague rigide 22 pour venir en butée contre le rebord 9 de l'entretoise 8 (figu­re 3). L'espace annulaire 33 existant entre les deux rebords 9 et 10, juste avant le tir, vise à permettre un déplace­ment relatif du canon 51 et du piston 6 et éviter ainsi un choc brutal au moment de l'amortissement du piston pouvant provoquer par inertie des ruptures de pièces.The buffer guide 7 is then either propelled forward if, at the location considered, the support is not under the part, that is to say if it can deform under stress, i.e. the whole device, with the exception initially of the buffer guide and the spacer, moves back under the action of the exhaust gases, the rim 10 of the barrel 51 leaving the rear face of the rigid ring 22 to come into abutment against the rim 9 of the spacer 8 (FIG. 3). The annular space 33 existing between the two flanges 9 and 10, just before firing, aims to allow relative movement of the barrel 51 and the piston 6 and thus avoid a brutal shock at the time of the damping of the piston which can cause inertia parts ruptures.

Après enfoncement du clou 3, l'extrémité avant de la tige 12 du piston 6 reste, ici, en retrait par rapport à la face avant 29 du guide-tampon 7. Même si on utilise l'appareil pour tirer, pour ainsi dire, dans le vide, c'est-à-dire sur une pièce à fixer de faible épaisseur en un endroit où elle n'est pas appliquée sur son support, le piston reste à l'intérieur de l'appareil. C'est un gage de sécurité et de qualité de la fixation.After driving in the nail 3, the front end of the rod 12 of the piston 6 remains, here, in relation to the front face 29 of the buffer guide 7. Even if the apparatus is used to pull, so to speak, in a vacuum, that is to say on a thin piece to be fixed in a place where it is not applied on its support, the piston remains inside the device. It is a guarantee of security and quality of the binding.

On a décrit un appareil à amortisseur comprenant une seule bague rigide monobloc 22 et une seule bague élastique mono­bloc 24. On ne sortirait pas du cadre de la présente inven­tion en prévoyant, au lieu d'une, plusieurs bagues rigides et, aussi au lieu d'une, plusieurs bagues élastiques. De même la bague élastique 24 pourrait être non plus à l'exté­rieur mais à l'intérieur de la bague rigide déformable 27, l'évidement de réception de la bague rigide, quand il est prévu, devenant alors annulaire.A shock-absorbing device has been described comprising a single rigid monobloc ring 22 and a single elastic monobloc ring 24. It would not be departing from the scope of the present invention to provide, instead of one, several rigid rings and, also instead of 'one, several elastic rings. Similarly, the elastic ring 24 could no longer be outside but inside the rigid deformable ring 27, the recess for receiving the rigid ring, when it is provided, then becoming annular.

Pour éviter encore mieux un choc brutal au moment de l'amor­tissement du piston, on peut disposer, dans l'espace annu­laire 33, une bague en matériau élastique, par exemple en polyuréthane, de section inférieure à celle de cet espace.To further avoid a brutal shock at the time of the damping of the piston, it is possible to have, in the annular space 33, a ring made of elastic material, for example of polyurethane, of section smaller than that of this space.

En fonctionnement, la bague 22 pouvant un peu gonfler, il est préférable que son diamètre extérieur soit légèrement inférieur au diamètre intérieur de l'entretoise 8. Par contre, comme la bague 22 doit rester guidée, on ménagera alors, sur la partie avant de la bague, un épaulement de centrage et de guidage de diamètre extérieur sensiblement égal au diamètre intérieur de l'entretoise 8.In operation, the ring 22 being able to swell a little, it is preferable that its outside diameter be slightly less than the inside diameter of the spacer 8. On the other hand, as the ring 22 must remain guided, we will then spare, on the front part of the ring, a centering and guiding shoulder with an outside diameter substantially equal to the inside diameter of the spacer 8.

L'angle d'ouverture de la partie tronconique 14 de la tête de piston, et de l'alésage correspondant 23 de la bague 22, est avantageusement compris entre 13° et 20°, et de préfé­rence sensiblement égale à 15°.The opening angle of the frustoconical part 14 of the piston head, and of the corresponding bore 23 of the ring 22, is advantageously between 13 ° and 20 °, and preferably substantially equal to 15 °.

On remarquera également que la dimension axiale de la bague intermédiaire rigide 27ʹ pourrait, à l'état neuf, être plus grande que celle de la bague intermédiaire élastique 24ʹ, dans son état non comprimé, sous réserve que l'évidement arrière 25ʹ du guide-tampon 7ʹ recevant la bague 27ʹ soit dimensionné en conséquence et permette le déplacement axial de la bague 27ʹ sur une longueur égale à la diminution de la dimension axiale de la bague élastique 24ʹ après compression (figure 4). La dimension axiale de l'évidement 25ʹ reste encore égale à la différence entre la dimension axiale de la bague 27ʹ et celle de la bague 24ʹ dans son état comprimé.It will also be noted that the axial dimension of the rigid intermediate ring 27ʹ could, in new condition, be greater than that of the elastic intermediate ring 24ʹ, in its uncompressed state, provided that the rear recess 25ʹ of the guide- pad 7ʹ receiving the ring 27ʹ is dimensioned accordingly and allows the axial displacement of the ring 27ʹ over a length equal to the decrease in the axial dimension of the elastic ring 24ʹ after compression (Figure 4). The axial dimension of the recess 25ʹ still remains equal to the difference between the axial dimension of the ring 27ʹ and that of the ring 24ʹ in its compressed state.

Claims (12)

1. Appareil de scellement à tir indirect, comprenant un piston (6) monté dans un canon (51) pour, sous l'action des gaz de combustion d'une charge propulsive (20), entraîner un tampon (3) de fixation d'une pièce (1) sur un support (2), des moyens d'amortissement du piston étant prévus entre le canon (51) et un guide-tampon (7) disposé en avant du canon, pour absorber l'excédent de l'énergie de propulsion du piston (6) et limiter sa course, les moyens amortisseurs comprenant en combinaision, une bague (22), conformée pour coopérer avec la tête (11) du piston (6), une première bague intermédiaire (24), en matériau élastique, disposée entre la bague (22) de coopération avec la tête de piston et le guide-tampon (7), et une deuxième bague intermédiaire (27), en matériau rigide mais légèrement déformable, déplaçable axialement entre la bague (22) de coopération avec la tête de piston et le guide-tampon (7), caractérisé par le fait que le guide-tampon (7) et la deuxième bague intermédiaire rigide (27) sont agencés pour que la longueur du déplacement axial de la bague (27) soit égale à la diminution de la dimension axiale de la bague intermédiaire élastique (24) après compression.1. Indirect fire sealing apparatus, comprising a piston (6) mounted in a barrel (51) for, under the action of the combustion gases of a propellant charge (20), driving a buffer (3) for fixing 'a part (1) on a support (2), means for damping the piston being provided between the barrel (51) and a buffer guide (7) disposed in front of the barrel, to absorb the excess of the propulsion energy of the piston (6) and limit its stroke, the damping means comprising in combination, a ring (22), shaped to cooperate with the head (11) of the piston (6), a first intermediate ring (24), elastic material, disposed between the ring (22) cooperating with the piston head and the buffer guide (7), and a second intermediate ring (27), made of rigid but slightly deformable material, axially displaceable between the ring (22) in cooperation with the piston head and the buffer guide (7), characterized in that the buffer guide (7) and the second intermediate ring ri gide (27) are arranged so that the length of the axial displacement of the ring (27) is equal to the decrease in the axial dimension of the elastic intermediate ring (24) after compression. 2. Appareil selon la revendication 1, dans lequel le guide-­tampon (7) comporte un évidement arrière (25) de réception de la bague intermédiaire rigide (27) de profondeur axiale au moins égale à la diminution de la dimension axiale de la bague intermédiaire élastique (24) après compression.2. Apparatus according to claim 1, wherein the buffer guide (7) comprises a rear recess (25) for receiving the rigid intermediate ring (27) of axial depth at least equal to the decrease in the axial dimension of the ring elastic intermediate (24) after compression. 3. Appareil selon la revendication 2, dans lequel la dimen­sion axiale des deux bagues intermédiaires (24, 27) est la même.3. Apparatus according to claim 2, wherein the axial dimension of the two intermediate rings (24, 27) is the same. 4. Appareil selon l'une des revendications 1 à 3, dans lequel la bague (22) de coopération avec la tête de piston est en matériau rigide.4. Apparatus according to one of claims 1 to 3, wherein the ring (22) of cooperation with the piston head is of rigid material. 5. Appareil selon l'une des revendications 2 à 4, dans lequel l'évidement arrière (25) du guide-tampon (7) présen­te une paroi latérale tronconique.5. Apparatus according to one of claims 2 to 4, wherein the rear recess (25) of the buffer guide (7) has a frustoconical side wall. 6. Appareil selon l'une des revendications 1 à 4, dans lequel un espace annulaire (32) est ménagé autour des deux bagues intermédiaires (24, 27) pour permettre, sous l'ac­tion du déplacement de la bague (22) de coopération avec la tête de piston, le gonflement de la première bague intermédiaire en matériau élastique (24), jusqu'à ce que la deuxième bague intermédiaire en matériau rigide et déforma­ble (27) vienne en butée contre l'arrière du guide-tampon (7).6. Apparatus according to one of claims 1 to 4, wherein an annular space (32) is formed around the two intermediate rings (24, 27) to allow, under the action of the movement of the ring (22) of cooperation with the piston head, the swelling of the first intermediate ring of elastic material (24), until the second intermediate ring of rigid and deformable material (27) abuts against the rear of the tampon guide (7 ). 7. Appareil selon la revendication 6, dans lequel la lon­gueur du déplacement axial de la bague intermédiaire rigide (27) et le volume de l'espace annulaire (32) sont tels que, à l'issue de la phase de déformation de la bague intermé­diaire élastique (24), au moment où la bague intermédiaire rigide (27) vient en butée contre le fond arrière du guide-­tampon (7), ledit volume n'est pas nul.7. Apparatus according to claim 6, wherein the length of the axial displacement of the rigid intermediate ring (27) and the volume of the annular space (32) are such that, at the end of the ring deformation phase elastic intermediate (24), when the rigid intermediate ring (27) abuts against the rear bottom of the buffer guide (7), said volume is not zero. 8. Appareil selon l'une des revendications 1 à 7, dans lequel la tête (11) du piston est évidée (13) pour recevoir le porte-charge (52).8. Apparatus according to one of claims 1 to 7, wherein the head (11) of the piston is recessed (13) to receive the load carrier (52). 9. Appareil selon l'une des revendications 1 à 8, dans lequel la somme des longueurs axiales de la bague (22) de coopération avec la tête de piston, de la bague élastique (24), dans son état comprimé, et du guide-tampon (7), d'une part, ainsi que la longueur de la partie avant (12) du piston destiné à faire saillie hors de la bague élastique (24), d'autre part, sont telles que l'extrémité avant du piston (6), après tir, ne fasse pas saillie hors du guide-tampon (7).9. Apparatus according to one of claims 1 to 8, wherein the sum of the axial lengths of the ring (22) of cooperation with the piston head, the elastic ring (24), in its compressed state, and the guide -tampon (7), on the one hand, as well as the length of the front part (12) of the piston intended to project out of the elastic ring (24), on the other hand, are such that the front end of the piston (6), after firing, does not protrude out of the buffer guide (7). 10.- Appareil selon l'une des revendications 1 à 9, dans lequel les deux bagues intermédiaires (24, 27) sont des manchons, l'un rigide et déformable (27), l'autre élas­tique (24).10.- Apparatus according to one of claims 1 to 9, wherein the two intermediate rings (24, 27) are sleeves, one rigid and deformable (27), the other elastic (24). 11.- Appareil selon l'une des revendications 1 à 10, dans lequel la tête (11) du piston (6) comporte une partie avant tronconique (14) et la bague (22) de coopération avec la tête de piston comporte un alésage (23) de forme corres­pondante.11.- Apparatus according to one of claims 1 to 10, wherein the head (11) of the piston (6) comprises a frustoconical front part (14) and the ring (22) of cooperation with the piston head comprises a bore (23) of corresponding shape. 12.- Appareil selon la revendication 2, dans lequel la dimension axiale de la bague intermédiaire rigide (27ʹ) est plus grande que celle de la bague intermédiaire élas­tique (24ʹ) dans son état non comprimé et l'évidement arrière (25ʹ) du guide-tampon (7ʹ), recevant la bague intermédiaire rigide (27ʹ) est dimensionné en conséquence.12.- Apparatus according to claim 2, wherein the axial dimension of the rigid intermediate ring (27ʹ) is greater than that of the elastic intermediate ring (24ʹ) in its uncompressed state and the rear recess (25ʹ) of the guide -buffer (7ʹ), receiving the rigid intermediate ring (27ʹ) is dimensioned accordingly.
EP87402935A 1986-12-23 1987-12-21 Fastening tool acting via an intermediate anvil Expired - Lifetime EP0274957B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8618018 1986-12-23
FR868618018A FR2608493B1 (en) 1986-12-23 1986-12-23 INDIRECT FIRE SEALING APPARATUS

Publications (2)

Publication Number Publication Date
EP0274957A1 true EP0274957A1 (en) 1988-07-20
EP0274957B1 EP0274957B1 (en) 1992-05-13

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ID=9342190

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EP87401447A Withdrawn EP0274919A1 (en) 1986-12-23 1987-06-24 Fastening tool acting via an intermediate anvil
EP87402935A Expired - Lifetime EP0274957B1 (en) 1986-12-23 1987-12-21 Fastening tool acting via an intermediate anvil

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP87401447A Withdrawn EP0274919A1 (en) 1986-12-23 1987-06-24 Fastening tool acting via an intermediate anvil

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US (1) US4824003A (en)
EP (2) EP0274919A1 (en)
JP (1) JP2720157B2 (en)
KR (1) KR950005411B1 (en)
AT (1) ATE75985T1 (en)
AU (2) AU598080B2 (en)
CA (1) CA1287699C (en)
DE (1) DE3779092D1 (en)
ES (1) ES2032849T3 (en)
FI (1) FI875680A (en)
FR (1) FR2608493B1 (en)
IE (1) IE59869B1 (en)
NO (1) NO165329C (en)
NZ (1) NZ223012A (en)

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EP0805002A2 (en) * 1996-05-03 1997-11-05 Beto-Tornado GmbH Powder-actuated bolt driving tool
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EP0826464A1 (en) * 1996-09-02 1998-03-04 HILTI Aktiengesellschaft Powder driven fastener tool with piston returning means
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EP0621110A1 (en) * 1993-04-17 1994-10-26 HILTI Aktiengesellschaft Powder-actuated driving tool
EP0732178A1 (en) * 1995-03-17 1996-09-18 Adolf Würth GmbH & Co. KG Bolt driving tool
EP0995552B1 (en) * 1995-03-17 2007-05-02 Adolf Würth GmbH & Co. KG Bolt driving tool
EP0995552A2 (en) * 1995-03-17 2000-04-26 Adolf Würth GmbH & Co. KG Bolt driving tool
WO1996039282A1 (en) * 1995-06-05 1996-12-12 Sencorp Assembly for deaccelerating a driver in a tool
EP0805003A3 (en) * 1996-05-03 1998-02-04 Beto-Tornado GmbH Powder-actuated bolt driving tool
EP0805002A3 (en) * 1996-05-03 1998-01-14 Beto-Tornado GmbH Powder-actuated bolt driving tool
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EP0826464A1 (en) * 1996-09-02 1998-03-04 HILTI Aktiengesellschaft Powder driven fastener tool with piston returning means
EP2769808A1 (en) * 2013-02-22 2014-08-27 King Fai Kenneth Kok Stress relaxation device for nail guns

Also Published As

Publication number Publication date
KR950005411B1 (en) 1995-05-24
JPS63229275A (en) 1988-09-26
IE873492L (en) 1988-06-23
EP0274957B1 (en) 1992-05-13
IE59869B1 (en) 1994-04-20
NZ223012A (en) 1989-11-28
AU630071B2 (en) 1992-10-22
FI875680A (en) 1988-06-24
ATE75985T1 (en) 1992-05-15
FR2608493A1 (en) 1988-06-24
NO165329C (en) 1991-01-30
NO165329B (en) 1990-10-22
DE3779092D1 (en) 1992-06-17
FI875680A0 (en) 1987-12-22
FR2608493B1 (en) 1994-09-02
ES2032849T3 (en) 1993-03-01
JP2720157B2 (en) 1998-02-25
CA1287699C (en) 1991-08-20
AU598080B2 (en) 1990-06-14
KR880007179A (en) 1988-08-26
US4824003A (en) 1989-04-25
AU8286887A (en) 1988-06-23
EP0274919A1 (en) 1988-07-20
NO875382L (en) 1988-06-24
NO875382D0 (en) 1987-12-22

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