EP2926912A1 - Compressed-air blower - Google Patents

Compressed-air blower Download PDF

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Publication number
EP2926912A1
EP2926912A1 EP15161599.4A EP15161599A EP2926912A1 EP 2926912 A1 EP2926912 A1 EP 2926912A1 EP 15161599 A EP15161599 A EP 15161599A EP 2926912 A1 EP2926912 A1 EP 2926912A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
axis
closure member
trigger
air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15161599.4A
Other languages
German (de)
French (fr)
Other versions
EP2926912B1 (en
Inventor
Alain-Christophe Tiberghien
Antoine Chambaud
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Staubli Faverges SCA
Original Assignee
Staubli Faverges SCA
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Application filed by Staubli Faverges SCA filed Critical Staubli Faverges SCA
Publication of EP2926912A1 publication Critical patent/EP2926912A1/en
Application granted granted Critical
Publication of EP2926912B1 publication Critical patent/EP2926912B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/005—Nozzles or other outlets specially adapted for discharging one or more gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/002—Manually-actuated controlling means, e.g. push buttons, levers or triggers

Definitions

  • the invention relates to a compressed air blow gun, used for example in a workshop to expel air on machined parts covered with chips, clean or dust machines and workstations.
  • the compressed air guns are powered by a pneumatic network with various connection points distributed in the workshop.
  • the blowers are portable and the air blowing through the blower is activated by squeezing a trigger.
  • These blowguns include a mechanism for selective opening of the passage of the compressed air, which is controlled by the trigger. Operators use in practice these blowers a dozen times a day, which severely solicits the mechanism of opening and closing the passage of compressed air.
  • IT-B-1 097 346 discloses a compressed air blower comprising a main body, which is traversed by a duct for the passage of compressed air and which has a hole opening obliquely in this duct.
  • a closure member is movable in translation within the hole between a closed position where the air passage duct is sealed and an open position where the air can circulate.
  • the displacement of the closing member is controlled by a trigger, which is manipulable by the operator between a relaxed configuration, where it keeps the closure member in the closed position, and a blowing configuration, where the air can circulate. in the conduit.
  • the blower comprises another valve, which is disposed downstream of the closure member in the duct for the passage of compressed air and which is designed to block the passage of air in case of overpressure according to a section. circular sealing.
  • DE-A-88 05 752 also discloses a compressed air blower, with which it is possible to expel alternately hot air or cold air.
  • This blower comprises a connection piece to the pneumatic network and a conduit for the passage of compressed air into the body of the blower.
  • a hole opens obliquely into the duct for the passage of compressed air and a closure member is movable in translation inside the hole.
  • This closure member carries at its end a nozzle shaped to seal the passage of air into the hole. When the blow gun is at rest, this nozzle bears on a seat to prevent the infiltration of air into the hole in a circular sealing section.
  • the closure member can be moved inside the hole by pulling a trigger. Upon actuation of the trigger, the tip of the closure member takes off from its seat and the compressed air can infiltrate the hole. This tip is also subjected to an elastic return spring to return to the sealed position when the trigger is released.
  • the invention more particularly intends to remedy by proposing a simplified air-blower.
  • this blower further comprises a tubular sleeve, which is immobilized inside the upstream duct, which extends parallel to the first axis and which delimits an air passage, whereas the organ closing, in the closed position, is adapted to close an orifice of the air passage forming with the sleeve a sealed contact.
  • FIG. 1 there is shown a compressed air gun 1, used to expel air on machined parts covered with chips, clean or dust machines and workstations.
  • This gun 1 has the appearance of a pistol and comprises a main body 2.
  • the body 2 is bent, that is to say it comprises an upstream portion 2b which extends in a direction slightly deviated from a downstream portion 2a.
  • the downstream part 2a is directed towards the part to be cleaned and the upstream part 2b is directed towards a source of compressed air.
  • the body 2 is traversed by a conduit 20 for the passage of compressed air.
  • This duct 20 comprises a downstream duct 20a and an upstream duct 20b which are delimited respectively in the downstream portion 2a and the upstream portion 2b of the body 2.
  • the downstream duct 20a is an air ejection duct while the upstream duct 20b is an air injection duct.
  • the ducts 20a and 20b respectively extend along axes X20a and X20b which are concurrent and which form between them an obtuse angle, approximately equal to 120 °.
  • the body 2 also defines a hole 22 which opens obliquely in the conduit 20b.
  • the hole 22 is hollowed perpendicularly to the conduit 20b, that is to say that it extends along an axis Y22 perpendicular to the axis X20b.
  • the hole 22 opens at a downstream end of the conduit 20b, that is to say close to the upstream end of the conduit 20a.
  • the hole 22 is a bore, that is to say it has a cylindrical wall.
  • the axes Y22 and X20b, respectively of the hole 22 and the upstream duct 20b, are perpendicular, which is considered as a configuration where the hole opens, along its axis, obliquely in the air duct - by relative to the axis of the duct.
  • a trigger 4 is hingedly mounted relative to the body 2. This trigger 4 triggers the expulsion of air by the blower 1.
  • the trigger is such that a manipulable lever with one hand.
  • the trigger 4 is rotatably mounted around a shaft 6 which extends along an axis Z6.
  • the axis Z6 thus forms an axis of rotation of the trigger 4 relative to the body 2.
  • the axis Z6 is perpendicular to both the X20b and Y22 axes.
  • the trigger 4 is shown in a relaxed configuration, where the expulsion of air through the blower 1 is blocked. By pulling the trigger 4, the trigger 4 goes into a blowing configuration, where the air is expelled from the blower 1.
  • the blower 1 is enterable by an operator regardless of the right hand or the left hand. When grasping, the operator places the palm of his hand against the part 2a of the body 2 and places his fingers around the trigger 4.
  • Reminder means hold trigger 4 in relaxed configuration.
  • These return means include a helical spring 8.
  • the trigger 4 is provided to tilt around the shaft 6 against the elastic force exerted by the spring 8. In other words, the spring 8 is compressed when the operator pulls the trigger 4.
  • Spring 8 extends between the trigger 4 and the body 2. It is centered on an axis Y8 which is substantially perpendicular to the axis X20b.
  • a sleeve 14 is immobilized inside the conduit 20b of the body 2. This sleeve 14 is better visible at the figure 7 , where he is represented alone.
  • the sleeve 14 is hollow and comprises two opposite orifices 014 and O'14 for the passage of compressed air.
  • the orifices 014 and O'14 are respectively disposed at the downstream and upstream ends of the sleeve 14.
  • the sleeve 14 is generally tubular and is centered on an axis X14 which is parallel, or even coincidental, with the axis X20b in the configuration installed in the conduit 20b.
  • the sleeve 14 thus extends parallel to the axis X20b and comprises an edge 140 bevelled.
  • This edge 140 is a downstream edge of the sleeve 14 and has a surface S140.
  • This surface S140 is an annular surface having elliptical outer and inner contours.
  • the surface S140 of the edge 140 has a relief 142, which extends around the orifice 014.
  • This relief 142 delimits the contour of the orifice 014.
  • the sleeve therefore delimits an air passage P14 which extends between the two orifices O14 and O'14 of the sleeve 14.
  • the air passage P14 is a central or internal passage of the sleeve 14, which connects the upstream duct and the downstream duct of the blower.
  • the orifices 014 and O'14 constitute the opposite ends of the passage P14.
  • the sleeve 14 is elastically deformable, especially at the surface S140 and the relief 142.
  • the sleeve 14 is preferably made of an elastic material, such as plastic or rubber. It may also be made of a rigid material and comprise, at the beveled edge 140, an elastic ring instead of the relief 142.
  • the sleeve 14 comprises a collar 144 for positioning the sleeve 14 inside the conduit 20b. Indeed, in assembled configuration of the sleeve 14 in the conduit 20b, the collar 144 abuts against a shoulder 24 of the body 2. This shoulder 24 is directed towards the inside of the conduit 20b and causes a reduction of the section of the conduit 20b in the downstream direction. Thus, the sleeve 14 is immobilized in translation.
  • the sleeve 14 also comprises a rib 146 which extends, parallel to the axis X14, from the collar 144 and towards the beveled edge 140. This rib 146 is an angular indexing rib of the sleeve 14 to the inside the conduit 20b. Indeed, this rib 146 is provided to be inserted into a corresponding groove 26 formed in the conduit 20b. In this way, the sleeve 14 is immobilized in rotation inside the conduit 20b in the required angular position.
  • the sleeve 14 comprises an upstream end 148 of connection with an end 12: this end of the sleeve, opposite the hole 22 is adapted to cooperate sealingly with the inner surface of the end 12 by fitting of the two elements.
  • the end 12 connects the blower 1 to a compressed air supply pipe, which is not shown in the figures.
  • the connection between the end 12 and the compressed air supply pipe is a male / female type connection.
  • the end 12 extends along an axis X12 which is parallel, or even coincident with the axis X20b.
  • the end 12 passes the body 2 and is immobilized inside the conduit 20b by means of a jumper 10, which makes it possible to fix it to the body 2.
  • the jumper 10 is of symmetrical shape with respect to the axis Y8.
  • the jumper 10 "overlaps" the end 12, that is to say that it is mounted around a peripheral groove 120 dug in the end 12. More specifically, it comprises a rounded wall 102, which is complementary of the groove 120 and which surrounds more than half of the circumference of the groove 120. In this way, the rider 10 and the abutment 12 are secured in translation along the axis X12 due to the elasticity of the rider.
  • the jumper 10 is inserted with a small clearance in a through housing 28 formed in the body 2.
  • This housing 28 extends parallel to the axis Y8 and makes it possible to immobilize the jumper 10 in translation along the axis X12. Therefore, the jumper 10 prevents the end 12 from sliding in the conduit 20b.
  • the jumper 10 also comprises two shoulders 104, which are oriented towards the trigger 4, opposite to the rounded wall 102. In the direction of the trigger 4, the shoulders 104 reduce the width of the jumper 10, this width being measured parallel to the Z6 axis.
  • One end of the spring 8 bears on these shoulders 104, the other end of the spring 8 being supported against two shoulders of the trigger 4.
  • the rider 10 is kept pressed into its housing 28, that is to say against the end 12 by the elastic force exerted by the spring 8. Otherwise formulated, the rounded wall 102 is held in the groove 120.
  • a closure member 16 is disposed inside the hole 22 of the body 2.
  • This closure member 16 also called “piston”, is generally cylindrical in shape and extends along a parallel axis Y16, or even coincides with the Y22 axis on which is centered the bore 22.
  • the closure member 16 is movable in translation parallel to the axis Y22 between a closed position, where it blocks the passage of air in the conduit 20 and an open position, where the air is free to flow between the upstream duct 20b and the downstream duct 20a. In the open position, which is a blow position, the blow gun 1 expels air.
  • the closure member 16 is provided to cooperate with the sleeve 14 in the closed position.
  • the member 16 comprises a beveled edge 166 which is complementary to the beveled edge 140 of the sleeve 14, that is to say that the edge 166 is configured to bear flat against the edge 140 in the closed position.
  • the edge 166 is a solid elliptical edge, configured to come into sealing contact with the edge 140 of the sleeve 14 in the closed position. More specifically, the beveled edge 166 of the closure member 16 is adapted to close the orifice 014 of the passage P14 in the closed position, forming with the sleeve 14 a sealed contact. In this position the compressed air is no longer free to circulate between the upstream duct and the downstream duct.
  • the surface S140 of the edge 140 thus forms a contact surface between the sleeve 14 and the member 16.
  • edge 166 of the closure member 16 and the edge 140 of the sleeve 14 may be concave, convex or otherwise irregular, but complementary to cooperate and form a sealed contact surface in the closed position of the closure member 16.
  • These edge configurations 166 and 140 have a contact surface generally disposed in a plane P1 oblique with respect to a plane P2 perpendicular to the conduit 20b.
  • the contact between the sleeve 14 and the member 16 is all the more tight because of the presence of the relief 142, which ensures the deformation of the elastic sleeve around the orifice 014 over its entire periphery.
  • the sleeve 14 is resiliently biased in compression in its axial direction X14 due to the presence of the relief 142.
  • the sleeve 14, seeking to resume its initial form by springback exerts on the closure member 16 an opposite force directed parallel to the axis X14, which ensures a tight contact with the member 16.
  • the closure member therefore has, by its relief 142, a deformable contact surface which seals the entire periphery of the orifice 014.
  • the contact surface S140 between the sleeve 14 and the closure member 16 is an annular surface, which ensures an optimum seal.
  • This surface has elliptical inner and outer contours and is disposed very close to a plane P1, or in a plane P1 oblique with respect to a plane P2 perpendicular to the conduit 20b. More specifically, the plane P1 marks with the plane P2 an angle A1 approximately equal to 45 °. However, the angle A1 is in practice between 20 ° and 70 °.
  • the inner contour of the annular surface is such that an ellipse of width a and of length b for a sleeve whose passage diameter is of value a.
  • the contact surface will be at least equal to the surface of the inner ellipse such that a / 2 xb / 2 x ⁇ , that is to say 2 x ⁇ 2 x ⁇ x 0.25.
  • the sealing surface made at the end of a bevel sleeve 45 ° is multiplied by ⁇ 2, an increase of about 41%.
  • the closure member 16 comprises a base 160 which is opposite the beveled edge 166 along the axis Y16. This base 160 protrudes peripherally with respect to the rest of the body of the closure member 16. It is generally rectangular and bears against a pusher 40 of the trigger 4. The pusher 40 is a protruding portion of the trigger 4 directed towards the body 2.
  • the closure member 16 comprises, approximately in the middle, a peripheral groove 162 for receiving a seal 164.
  • This seal 164 makes it possible to prevent air from entering the hole 22 operation.
  • a single seal is used in the construction of the gun 1, which facilitates assembly.
  • the rectangular base 160 of the closing member 16 is partially engaged in two through-holes 44 delimited in the trigger 4.
  • the housings 44 are opposite one another with respect to a plane P3 of the blowgun and in a direction parallel to the axis Z6.
  • the plane P3 is a plane perpendicular to the plane P2 and to the axis Z6, which contains the axes Y16 and Y22.
  • the plane P3 is also the cutting plane of the blower 2 to Figures 1 to 3 .
  • These housings 44 are rectangular openings disposed on either side of the member 16. They have a width, measured parallel to the axis Y16, which is greater than the thickness of the base 160.
  • a set of contact J exists between the base 160 and a contact edge 440 of the housing 44.
  • the edge 440 is the edge of the housing 44 closest to the upstream conduit 20b and which is opposite the pusher 40.
  • the edge 440 is the edge likely to come in contact with the base 160 of the member 16 during the actuation of the trigger 4.
  • the edge 440 is the edge of the housing 44 closest to the base 160, but it may be differently .
  • the contact clearance J is an axial clearance which changes as a function of the disposition of the base 160 in the housings 44. In the closed position, this clearance J is of the order of 0.5 mm.
  • the axial clearance J available to the closure member 16 inside the hole 22 allows it to make optimal contact, that is to say, as tightly as possible, with the sleeve 14 in the closed position. .
  • the sleeve 14 As explained above, in the case where the sleeve 14 is rigid, it carries at its bevelled edge 140 an elastic ring. This elastic ring is compressed during contact with the closure member 16 to obtain a tight contact between the two parts, and a maximum seal.
  • the closure member 16 is guided in translation in the duct 22. Indeed, as visible in FIG. figure 5 , the rectangular base 160 is received in a cavity 42 of the trigger 4. This cavity 42 generally matches the shape of the base 160, so that the closure member is immobile in rotation about the axis Y16 inside.
  • the base 160 comprises two shoulders, which delimit a portion 160a of width, measured parallel to the axis Z6, narrowed relative to the rest of the base 160. This allows to correctly index the body of closing 16 inside the hole 22, that is to say to angularly position the closure member 16 so that its bevelled edge 166 is perfectly in plane contact with the edge 140 of the sleeve 14 in the closed position.
  • the spring 8 exerts on the trigger 4 a force F3 directed along the axis Y8.
  • This elastic load force F3 tends to tilt the trigger 4 around the shaft 6 in a clockwise direction to the figure 2 .
  • the movement of the trigger 4 is limited in this direction by the body 2. Therefore, the pusher 40 presses the closure member 16 in a direction F4 directed parallel to the axis Y16, and in the direction of the conduit 20b .
  • the support force F4 of the pusher 40 on the closure member 16 keeps the closure member 16 in the closed position under the pressure of the compressed air.
  • the compressed air coming from the abutment 12 exerts a pressure F5 on the beveled edge 166 of the closure member 16 and causes pressure forces on the contact surface 166 of the closure member 16 which generate a component of force along the axis Y16 in the direction of the pusher 40.
  • the closure member 16 behaves like a wedge, that is to say that the pressure exerted by the compressed air in the conduit 20b on the member 16 tends to move the closure member 16 in a direction opposite to the conduit 20 and along the axis Y16.
  • the support force F4 of the pusher 40 is preponderant in front of the pressure F5 of the compressed air exerted on the closure member 16, so that the trigger 4 can not rock alone towards the body 2 , ie in blowing configuration.
  • the user pulls the trigger 4 by clenching his fist.
  • the trigger 4 leaves its relaxed configuration and pivots around the shaft 6 against the load F3 elastic load of the spring 8, as represented by the arrows F1 and F2 at the figure 2 .
  • the pusher 40 moves away from the closure member 16, that is to say that it no longer exerts a retaining force F4.
  • the closure member 16 is driven in translation in a direction F7.
  • This direction F7 is oriented parallel to the axis Y16 due to the presence of the beveled edge 166, which acts as a wedge.
  • the displacement of the closing member 16 in the direction F7 causes the rupture of the sealing contact between the closure member 16 and the sleeve 14.
  • the air can circulate, as represented by the arrows F6 at the figure 3 .
  • the closure member 16 is however driven by the trigger 4 in translation in the direction F7. Indeed, during the tilting of the trigger 4 towards the body 2, the clearance J existing between the base 160 of the closure member 16 and the housing 44 of the trigger 4 is overtaken and the base 160 comes into contact with the edges 440 of the housing 44, which causes the closing member 16 in translation.
  • the advantage of using a closing edge 166 of the inclined conduit 20 ensures that the displacement of the closure member 16 is not in opposition to the pressure of the compressed air injected into the end 12.
  • the pressure of the compressed air accompanies the movement of the closure member 16 between its closed position and its open position. The operator does not have to force to squeeze the trigger 4 and the gun 1 is easily manipulated.
  • the forces required to open the conduit 20 must not overcome the pressure force F5 exerted by the air upstream and the operator does not act against the pressure of the network when he wishes to expel air by the blower.
  • the blowing can be carried out in a progressive and controlled manner.
  • Clamping the trigger 4 brings the blower 1 into the configuration of the figure 3 .
  • the trigger 4 is then in the blowing configuration, where the air circulates in the duct 20.
  • the trigger 4 When the operator has finished using the gun 1, it releases the pressure on the trigger 4.
  • the trigger 4 then returns to its relaxed configuration under the spring return force F3 of the spring 8.
  • the spring 8 relaxes .
  • the trigger 4 pivots around the shaft 6 and the pusher 40 presses the closure member 16 to drive it in translation inside the hole 22 until it comes into contact with the edge Beveled 140 of the sleeve 14.
  • the sleeve 14 and the closure member 16 are then again in sealing contact and the passage of air in the orifice 014 of the sleeve 14 is blocked.
  • FIG. 9 On the figure 9 is shown a second embodiment of a compressed air blower according to the invention.
  • the elements that are identical or that operate in a similar manner with respect to the blower of the first embodiment retain their numerical reference while the additional elements or elements that operate differently with respect to those of the first embodiment carry other numerical references. .
  • the compressed air gun 1 of the figure 9 differs from that of the first embodiment in that the body 2 comprises a handle 30 for handling the air blow gun 1.
  • This handle 30 facilitates the grip of the blow gun 1.
  • the blow gun 1 comprises a body 2 having a bent portion 2a on which a nozzle 36 is snapped. Snap-fastening means that it may be an elastic locking mechanism on assembly, a pin or peripheral claws of the nozzle configured to penetrate into a curvilinear groove or bent body.
  • the nozzle 36 may also be screwed to the end of the bent portion 2a of the body 2.
  • the blow gun 1 of this embodiment comprises a butt 38 which is also snapped inside the body 2. The advantage of this embodiment is that the nozzle is interchangeable and allows in particular to adapt the shape of the jet.
  • the blower 1 comprises a body 2 also comprising a handling handle 30.
  • the blower 1 comprises an ejection nozzle of compressed air that is made in two parts. Indeed, a first portion 34 is snapped onto a bent portion 2a of the body 2 and a second portion 32 is inserted into a conduit 20a of the bent portion 2a and is immobilized by the portion 34 by means of retaining means belonging to Part 34.
  • the end 12 is integral with the body 2.
  • the housings 44 are blind.
  • closure member 16 can be movable in a hole which opens into the conduit 20b upstream relative to the sleeve 14, and close the upstream edge 148 of the sleeve 14 and not the downstream edge 140 as previously presented.
  • the closure member 16 may not have a beveled edge but an edge perpendicular to its axis and extend along a translation axis perpendicular to the contact surface S140 of the beveled edge of the sleeve 14.
  • the sleeve 14 may not have beveled edge and the contact surface S140 may be such that an annular surface having circular inner and outer contours.
  • the closure member 16 has a slight play in rotation about its axis X16, which can improve the contact with the sleeve 14, that is to say, catch up with a possible lack of coplanarity between the mating surfaces of sleeve 14 and member 16.

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Abstract

Cette soufflette à air comprimé (1) comprend un corps (2), comportant un conduit amont (20b) qui s'étend selon un premier axe (X20b) et un conduit aval (20a) d'éjection d'air, et un trou (22), qui s'étend selon un deuxième axe (Y22), un organe de fermeture (16), qui est mobile en translation à l'intérieur du trou entre une position fermée et une position ouverte, une gâchette (4) qui est manipulable entre une configuration relâchée, où elle maintient l'organe de fermeture en position fermée et une configuration de soufflage, et des moyens (8) de rappel de la gâchette vers sa configuration relâchée. Cette soufflette comprend, en outre, un manchon tubulaire (14), qui est immobilisé à l'intérieur du conduit amont (20b), qui s'étend parallèlement au premier axe (X20b) et qui délimite un passage d'air alors que l'organe de fermeture (16) en position fermée, est adapté pour obturer un orifice du passage d'air en formant avec le manchon un contact étanche.This air blow gun (1) comprises a body (2), comprising an upstream duct (20b) which extends along a first axis (X20b) and an downstream duct (20a) of air ejection, and a hole (22), which extends along a second axis (Y22), a closure member (16), which is movable in translation within the hole between a closed position and an open position, a trigger (4) which is manipulable between a relaxed configuration, where it keeps the closure member in the closed position and a blow configuration, and means (8) for returning the trigger to its relaxed configuration. This blower further comprises a tubular sleeve (14), which is immobilized inside the upstream duct (20b), which extends parallel to the first axis (X20b) and which delimits an air passage while the closing member (16) in closed position, is adapted to close an orifice of the air passage forming with the sleeve a sealed contact.

Description

L'invention concerne une soufflette à air comprimé, utilisée par exemple dans un atelier pour expulser de l'air sur des pièces d'usinage recouvertes de copeaux, nettoyer ou dépoussiérer les machines et les postes de travail.The invention relates to a compressed air blow gun, used for example in a workshop to expel air on machined parts covered with chips, clean or dust machines and workstations.

Les soufflettes à air comprimé sont alimentées par un réseau pneumatique comportant divers points de raccordement répartis dans l'atelier. Les soufflettes sont portatives et l'expulsion d'air à travers la soufflette est activée en pressant une gâchette. Ces soufflettes comprennent un mécanisme d'ouverture sélective du passage de l'air comprimé, qui est commandé par la gâchette. Les opérateurs utilisent en pratique ces soufflettes une dizaine de fois par jour, ce qui sollicite sévèrement le mécanisme d'ouverture et de fermeture du passage de l'air comprimé.The compressed air guns are powered by a pneumatic network with various connection points distributed in the workshop. The blowers are portable and the air blowing through the blower is activated by squeezing a trigger. These blowguns include a mechanism for selective opening of the passage of the compressed air, which is controlled by the trigger. Operators use in practice these blowers a dozen times a day, which severely solicits the mechanism of opening and closing the passage of compressed air.

IT-B-1 097 346 divulgue une soufflette à air comprimé comprenant un corps principal, qui est traversé par un conduit de passage de l'air comprimé et qui comporte un trou débouchant de manière oblique dans ce conduit. Un organe de fermeture est mobile en translation à l'intérieur du trou entre une position fermée où le conduit de passage de l'air est obturé de manière étanche et une position ouverte où l'air peut circuler. Le déplacement de l'organe de fermeture est commandé par une gâchette, qui est manipulable par l'opérateur entre une configuration relâchée, où elle maintient l'organe de fermeture en position fermée, et une configuration de soufflage, où l'air peut circuler dans le conduit. En outre, la soufflette comprend une autre valve, qui est disposée en aval de l'organe de fermeture dans le conduit de passage de l'air comprimé et qui est prévue pour bloquer le passage de l'air en cas de surpression suivant une section d'étanchéité circulaire. IT-B-1 097 346 discloses a compressed air blower comprising a main body, which is traversed by a duct for the passage of compressed air and which has a hole opening obliquely in this duct. A closure member is movable in translation within the hole between a closed position where the air passage duct is sealed and an open position where the air can circulate. The displacement of the closing member is controlled by a trigger, which is manipulable by the operator between a relaxed configuration, where it keeps the closure member in the closed position, and a blowing configuration, where the air can circulate. in the conduit. In addition, the blower comprises another valve, which is disposed downstream of the closure member in the duct for the passage of compressed air and which is designed to block the passage of air in case of overpressure according to a section. circular sealing.

L'inconvénient majeur de cette soufflette est que le conduit de passage de l'air comprimé est relativement encombré par l'ensemble des pièces constitutives des deux valves et que l'actionnement du clapet de surpression se fait à l'encontre de la pression du réseau, ce qui entraîne une dégradation accélérée des pièces. De plus, trois canaux sont nécessaires pour réaliser le clapet de surpression, ce qui implique un usinage complexe du corps de la soufflette.The major disadvantage of this blower is that the conduit for the passage of compressed air is relatively congested by all the constituent parts of the two valves and that the actuation of the pressure relief valve is against the pressure of the pressure. network, resulting in accelerated degradation of parts. In addition, three channels are necessary to make the pressure relief valve, which involves a complex machining of the body of the gun.

D'autre part, DE-A-88 05 752 divulgue également une soufflette à air comprimé, avec laquelle il est possible d'expulser alternativement de l'air chaud ou de l'air froid. Cette soufflette comprend un embout de raccordement au réseau pneumatique et un conduit de passage de l'air comprimé dans le corps de la soufflette. Un trou débouche de manière oblique dans le conduit de passage de l'air comprimé et un organe de fermeture est mobile en translation à l'intérieur du trou. Cet organe de fermeture porte à son extrémité un embout conformé pour obturer le passage de l'air dans le trou. Lorsque la soufflette est au repos, cet embout prend appui sur un siège pour empêcher l'infiltration d'air dans le trou selon une section d'étanchéité circulaire. L'organe de fermeture peut être déplacé à l'intérieur du trou en tirant sur une gâchette. Lors de l'actionnement de la gâchette, l'embout de l'organe de fermeture décolle de son siège et l'air comprimé peut s'infiltrer dans le trou. Cet embout est par ailleurs soumis à un ressort de rappel élastique pour revenir en position d'obturation étanche lorsque la gâchette est relâchée.On the other hand, DE-A-88 05 752 also discloses a compressed air blower, with which it is possible to expel alternately hot air or cold air. This blower comprises a connection piece to the pneumatic network and a conduit for the passage of compressed air into the body of the blower. A hole opens obliquely into the duct for the passage of compressed air and a closure member is movable in translation inside the hole. This closure member carries at its end a nozzle shaped to seal the passage of air into the hole. When the blow gun is at rest, this nozzle bears on a seat to prevent the infiltration of air into the hole in a circular sealing section. The closure member can be moved inside the hole by pulling a trigger. Upon actuation of the trigger, the tip of the closure member takes off from its seat and the compressed air can infiltrate the hole. This tip is also subjected to an elastic return spring to return to the sealed position when the trigger is released.

Au total, quatre canaux de passage d'air sont usinés dans le corps de la soufflette, ce qui est onéreux à réaliser. En outre, l'ouverture du clapet se fait à l'encontre de la pression de l'air comprimé, ce qui peut entraîner, en cas de forte pression, une ouverture brusque et difficile du passage et ne permet pas de souffler de l'air de façon progressive et contrôlée.In total, four air passage channels are machined in the body of the gun, which is expensive to achieve. In addition, the opening of the valve is against the pressure of the compressed air, which can cause, in case of high pressure, a sudden and difficult opening of the passage and does not allow blowing of the air. air in a progressive and controlled way.

C'est à ces inconvénients qu'entend plus particulièrement remédier l'invention en proposant une soufflette à air comprimé simplifiée.It is to these drawbacks that the invention more particularly intends to remedy by proposing a simplified air-blower.

A cet effet, l'invention concerne une soufflette à air comprimé, comprenant :

  • un corps, comportant un conduit de passage de l'air comprimé incluant un conduit amont qui s'étend selon un premier axe et un conduit aval d'éjection d'air, et un trou, qui s'étend selon un deuxième axe et qui débouche de manière oblique dans le conduit amont,
  • un organe de fermeture, qui est mobile en translation, parallèlement au deuxième axe, à l'intérieur du trou entre une position fermée, où il bloque le passage de l'air dans le conduit et une position ouverte, où l'air est libre de circuler entre le conduit amont et le conduit aval,
  • une gâchette de commande du déplacement de l'organe de fermeture, qui est manipulable entre une configuration relâchée, où elle maintient l'organe de fermeture en position fermée et une configuration de soufflage, où l'organe de fermeture est en position ouverte,
  • des moyens de rappel de la gâchette vers sa configuration relâchée.
For this purpose, the invention relates to a compressed air blowgun, comprising:
  • a body, comprising a duct for the passage of compressed air, including an upstream duct which extends along a first axis and a downstream duct for air ejection, and a hole which extends along a second axis and which leads obliquely into the upstream duct,
  • a closing member, which is movable in translation, parallel to the second axis, inside the hole between a closed position, where it blocks the passage of air in the duct and an open position, where the air is free to circulate between the upstream duct and the downstream duct,
  • a trigger for controlling the movement of the closing member, which can be manipulated between a relaxed configuration, where it holds the closure member in the closed position and a blow configuration, in which the closure member is in the open position,
  • means for returning the trigger to its relaxed configuration.

Conformément à l'invention, cette soufflette comprend, en outre, un manchon tubulaire, qui est immobilisé à l'intérieur du conduit amont, qui s'étend parallèlement au premier axe et qui délimite un passage d'air, alors que l'organe de fermeture, en position fermée, est adapté pour obturer un orifice du passage d'air en formant avec le manchon un contact étanche.According to the invention, this blower further comprises a tubular sleeve, which is immobilized inside the upstream duct, which extends parallel to the first axis and which delimits an air passage, whereas the organ closing, in the closed position, is adapted to close an orifice of the air passage forming with the sleeve a sealed contact.

Grâce à l'invention, seuls le conduit de passage de l'air comprimé et le trou débouchant dans ce conduit nécessitent d'usinages dans le corps de la soufflette, ce qui simplifie considérablement la fabrication du corps de la soufflette. De plus, seulement deux pièces internes sont nécessaires pour assurer l'étanchéité en position fermée qui se montent sans opération de vissage.Thanks to the invention, only the duct for passage of compressed air and the hole opening into this duct require machining in the body of the blower, which greatly simplifies the manufacture of the body of the blower. In addition, only two internal parts are required to seal in the closed position that can be mounted without a screwing operation.

Selon des aspects avantageux mais non obligatoires de l'invention, une soufflette à air comprimé peut incorporer une ou plusieurs des caractéristiques suivantes, prises dans toute combinaison techniquement admissible :

  • Le manchon délimite une surface de contact avec l'organe de fermeture, qui est disposée dans un plan oblique par rapport à un plan perpendiculaire au premier axe.
  • La surface de contact du manchon est une surface annulaire ayant des contours intérieur et extérieur elliptiques.
  • Le manchon et l'organe de fermeture comprennent chacun un bord taillé en biseau et la surface de contact du manchon est délimitée sur son bord biseauté.
  • La surface de contact du manchon comporte un relief, qui forme une surface d'étanchéité avec l'organe de fermeture lorsque celui-ci est en position fermée.
  • La soufflette comprend un about de raccordement à un tube d'alimentation en air comprimé, cet about étant adapté pour être fixé au corps de la soufflette et étant apte à coopérer de manière étanche avec une extrémité du manchon opposée au trou.
  • La soufflette comprend des moyens d'immobilisation de l'about dans le conduit amont, qui comprennent un cavalier qui est immobilisé dans un logement du corps par les moyens de rappel de la gâchette et qui coopère avec une gorge périphérique de l'about pour bloquer le coulissement de l'about à l'intérieur du conduit amont.
  • L'organe de fermeture est maintenu en position fermée par un poussoir de la gâchette, qui est en appui contre une extrémité de l'organe de fermeture opposée au conduit amont et le poussoir agit sur l'organe de fermeture selon le deuxième axe du trou.
  • La soufflette comprend des moyens d'immobilisation du manchon en rotation à l'intérieur du conduit amont, qui comprennent une nervure longitudinale portée par le manchon et une rainure de réception de cette nervure ménagée dans le corps de la soufflette.
  • La gâchette comprend des moyens d'entrainement de l'organe de fermeture en translation vers sa position ouverte, ces moyens comprennent au moins un logement de réception d'une base saillante de l'organe de fermeture, et la base saillante est disposée à une extrémité opposée au conduit amont et est engagée dans le ou les logements de la gâchette avec un jeu axial, mesuré parallèlement au deuxième axe du trou, entre la base de l'organe de fermeture et un bord de contact du ou des logements.
  • Le trou de réception de l'organe de fermeture s'étend selon son deuxième axe de manière perpendiculaire au premier axe du conduit amont.
  • Le manchon est en matériau élastique, notamment en matière plastique ou en caoutchouc.
According to advantageous but non-mandatory aspects of the invention, a compressed air blower may incorporate one or more of the following features, taken in any technically permissible combination:
  • The sleeve defines a contact surface with the closure member, which is disposed in an oblique plane relative to a plane perpendicular to the first axis.
  • The contact surface of the sleeve is an annular surface having elliptical inner and outer contours.
  • The sleeve and the closure member each comprise a bevelled edge and the contact surface of the sleeve is delimited on its bevelled edge.
  • The contact surface of the sleeve comprises a relief, which forms a sealing surface with the closure member when the latter is in the closed position.
  • The blower comprises a connection end to a compressed air supply tube, this end being adapted to be fixed to the body of the blower and being adapted to cooperate sealingly with one end of the sleeve opposite the hole.
  • The blower comprises immobilization means of the abutment in the upstream duct, which comprise a jumper which is immobilized in a housing of the body by the trigger return means and which cooperates with a peripheral groove of the end to lock the sliding of the abutment inside the upstream duct.
  • The closure member is held in the closed position by a trigger of the trigger, which bears against one end of the closing member opposite the upstream conduit and the pusher acts on the closure member along the second axis of the hole .
  • The blower comprises means for immobilizing the sleeve in rotation inside the upstream duct, which comprise a longitudinal rib carried by the sleeve and a groove for receiving this rib formed in the body of the blower.
  • The trigger comprises means for driving the closure member in translation towards its open position, these means comprise at least one housing for receiving a projecting base of the closure member, and the projecting base is arranged at a opposite end to the upstream duct and is engaged in the housing or housing of the trigger with an axial clearance, measured parallel to the second axis of the hole, between the base of the closure member and a contact edge of the housing or housing.
  • The receiving hole of the closure member extends along its second axis perpendicularly to the first axis of the upstream conduit.
  • The sleeve is made of elastic material, in particular of plastic or rubber.

L'invention et d'autres avantages de celle-ci apparaîtront plus clairement à la lumière de la description qui va suivre de trois modes de réalisation d'une soufflette à air comprimé conforme à son principe, donnée uniquement à titre d'exemple et faite en référence aux dessins dans lesquels :

  • la figure 1 est une vue en perspective d'une soufflette à air comprimé conforme à l'invention, dans laquelle un corps de la soufflette est représenté en demi-coupe,
  • la figure 2 est une coupe de la soufflette de la figure 1, dans laquelle la soufflette est représentée en configuration de repos, ou inutilisée,
  • la figure 3 est une coupe analogue à la figure 2, dans laquelle la soufflette est représentée dans une configuration de soufflage,
  • la figure 4 est une coupe à plus grande échelle selon la ligne IV-IV à la figure 3,
  • la figure 5 est une coupe à plus grande échelle selon la ligne V-V à la figure 3,
  • la figure 6 est une coupe à plus grande échelle selon la ligne VI-VI à la figure 3,
  • la figure 7 est une vue en perspective d'un manchon appartenant à la soufflette des figures précédentes,
  • la figure 8 est une vue en perspective de la soufflette des figures précédentes, qui est représentée avec une partie arrachée pour visualiser un jeu de déplacement d'un organe de fermeture à l'intérieur de la soufflette,
  • la figure 9 est une coupe analogue à la figure 2 d'une soufflette à air comprimé conforme à un deuxième mode de réalisation de l'invention, et
  • la figure 10 est une vue en coupe partielle, représentant un troisième mode de réalisation d'une soufflette à air comprimé conforme à l'invention.
The invention and other advantages thereof will appear more clearly in the light of the following description of three embodiments of a compressed air blower in accordance with its principle, given solely by way of example and made with reference to the drawings in which:
  • the figure 1 is a perspective view of a compressed air blower according to the invention, in which a body of the blower is shown in half-section,
  • the figure 2 is a section of the blow gun of the figure 1 in which the blow gun is shown in the idle configuration, or unused,
  • the figure 3 is a cut similar to the figure 2 in which the blow gun is shown in a blow pattern,
  • the figure 4 is a larger-scale section along line IV-IV at figure 3 ,
  • the figure 5 is a larger-scale section along the line VV to the figure 3 ,
  • the figure 6 is a larger-scale section along the line VI-VI to the figure 3 ,
  • the figure 7 is a perspective view of a sleeve belonging to the blow gun of the preceding figures,
  • the figure 8 is a perspective view of the blow gun of the preceding figures, which is shown with a broken part to show a set of movement of a closure member inside the blow gun,
  • the figure 9 is a cut similar to the figure 2 a compressed air gun according to a second embodiment of the invention, and
  • the figure 10 is a partial sectional view, showing a third embodiment of a compressed air blower according to the invention.

Sur la figure 1 est représentée une soufflette à air comprimé 1, utilisée pour expulser de l'air sur des pièces d'usinage recouvertes de copeaux, nettoyer ou dépoussiérer des machines et postes de travail.On the figure 1 there is shown a compressed air gun 1, used to expel air on machined parts covered with chips, clean or dust machines and workstations.

Dans ce document, les directions « amont » et « aval » doivent être interprétées par rapport au flux d'air circulant dans la soufflette 1.In this document, the "upstream" and "downstream" directions must be interpreted with respect to the flow of air flowing in the blower 1.

Cette soufflette 1 a l'apparence d'un pistolet et comprend un corps principal 2. Le corps 2 est coudé, c'est-à-dire qu'il comprend une partie amont 2b qui s'étend selon une direction légèrement déviée par rapport à une partie aval 2a. En fonctionnement, la partie aval 2a est dirigée vers la pièce à nettoyer et la partie amont 2b est orientée vers une source d'air comprimé.This gun 1 has the appearance of a pistol and comprises a main body 2. The body 2 is bent, that is to say it comprises an upstream portion 2b which extends in a direction slightly deviated from a downstream portion 2a. In operation, the downstream part 2a is directed towards the part to be cleaned and the upstream part 2b is directed towards a source of compressed air.

Le corps 2 est traversé par un conduit 20 de passage de l'air comprimé. Ce conduit 20 comprend un conduit aval 20a et un conduit amont 20b qui sont délimités respectivement dans la partie aval 2a et la partie amont 2b du corps 2. Le conduit aval 20a est un conduit d'éjection d'air alors que le conduit amont 20b est un conduit d'injection d'air. Les conduits 20a et 20b s'étendent respectivement selon des axes X20a et X20b qui sont concourants et qui forment entre eux un angle obtus, environ égal à 120°. Le corps 2 délimite également un trou 22 qui débouche de manière oblique dans le conduit 20b. En particulier, le trou 22 est creusé de manière perpendiculaire au conduit 20b, c'est-à-dire qu'il s'étend selon un axe Y22 perpendiculaire à l'axe X20b. Le trou 22 débouche à une extrémité aval du conduit 20b, c'est-à-dire proche de l'extrémité amont du conduit 20a. Le trou 22 est un alésage, c'est-à-dire qu'il comporte une paroi cylindrique. Les axes Y22 et X20b, respectivement du trou 22 et du conduit amont 20b, sont perpendiculaires, ce que l'on considère comme une configuration où le trou débouche, selon son axe, de manière oblique dans le conduit de passage d'air - par rapport à l'axe du conduit.The body 2 is traversed by a conduit 20 for the passage of compressed air. This duct 20 comprises a downstream duct 20a and an upstream duct 20b which are delimited respectively in the downstream portion 2a and the upstream portion 2b of the body 2. The downstream duct 20a is an air ejection duct while the upstream duct 20b is an air injection duct. The ducts 20a and 20b respectively extend along axes X20a and X20b which are concurrent and which form between them an obtuse angle, approximately equal to 120 °. The body 2 also defines a hole 22 which opens obliquely in the conduit 20b. In particular, the hole 22 is hollowed perpendicularly to the conduit 20b, that is to say that it extends along an axis Y22 perpendicular to the axis X20b. The hole 22 opens at a downstream end of the conduit 20b, that is to say close to the upstream end of the conduit 20a. The hole 22 is a bore, that is to say it has a cylindrical wall. The axes Y22 and X20b, respectively of the hole 22 and the upstream duct 20b, are perpendicular, which is considered as a configuration where the hole opens, along its axis, obliquely in the air duct - by relative to the axis of the duct.

Une gâchette 4 est montée de manière articulée par rapport au corps 2. Cette gâchette 4 permet de déclencher l'expulsion d'air par la soufflette 1. La gâchette est telle qu'un levier manipulable à une main. La gâchette 4 est montée en rotation autour d'un arbre 6 qui s'étend selon un axe Z6. L'axe Z6 forme donc un axe de rotation de la gâchette 4 par rapport au corps 2. L'axe Z6 est perpendiculaire à la fois aux axes X20b et Y22. Sur la figure 1, la gâchette 4 est représentée dans une configuration relâchée, où l'expulsion d'air au travers de la soufflette 1 est bloquée. En tirant sur la gâchette 4, la gâchette 4 passe dans une configuration de soufflage, où l'air est expulsé de la soufflette 1.A trigger 4 is hingedly mounted relative to the body 2. This trigger 4 triggers the expulsion of air by the blower 1. The trigger is such that a manipulable lever with one hand. The trigger 4 is rotatably mounted around a shaft 6 which extends along an axis Z6. The axis Z6 thus forms an axis of rotation of the trigger 4 relative to the body 2. The axis Z6 is perpendicular to both the X20b and Y22 axes. On the figure 1 , the trigger 4 is shown in a relaxed configuration, where the expulsion of air through the blower 1 is blocked. By pulling the trigger 4, the trigger 4 goes into a blowing configuration, where the air is expelled from the blower 1.

La soufflette 1 est saisissable par un opérateur indifféremment de la main droite ou de la main gauche. Lors de la prise en main, l'opérateur place la paume de sa main contre la partie 2a du corps 2 et place ses doigts autour de la gâchette 4.The blower 1 is enterable by an operator regardless of the right hand or the left hand. When grasping, the operator places the palm of his hand against the part 2a of the body 2 and places his fingers around the trigger 4.

Des moyens de rappel maintiennent la gâchette 4 en configuration relâchée. Ces moyens de rappel incluent un ressort hélicoïdal 8. La gâchette 4 est prévue pour basculer autour de l'arbre 6 à l'encontre de l'effort élastique exercé par ce ressort 8. Autrement dit, le ressort 8 est comprimé lorsque l'opérateur tire sur la gâchette 4. Le ressort 8 s'étend entre la gâchette 4 et le corps 2. Il est centré sur un axe Y8 qui est sensiblement perpendiculaire à l'axe X20b.Reminder means hold trigger 4 in relaxed configuration. These return means include a helical spring 8. The trigger 4 is provided to tilt around the shaft 6 against the elastic force exerted by the spring 8. In other words, the spring 8 is compressed when the operator pulls the trigger 4. Spring 8 extends between the trigger 4 and the body 2. It is centered on an axis Y8 which is substantially perpendicular to the axis X20b.

Un manchon 14 est immobilisé à l'intérieur du conduit 20b du corps 2. Ce manchon 14 est mieux visible à la figure 7, où il est représenté seul. Le manchon 14 est creux et comprend deux orifices opposés 014 et O'14 de passage de l'air comprimé. Les orifices 014 et O'14 sont disposés respectivement aux extrémités aval et amont du manchon 14. Le manchon 14 est globalement tubulaire et est centré sur un axe X14 qui est parallèle, voire confondu, avec l'axe X20b en configuration installée dans le conduit 20b. Le manchon 14 s'étend donc parallèlement à l'axe X20b et comprend un bord 140 taillé en biseau. Ce bord 140 est un bord aval du manchon 14 et comporte une surface S140. Cette surface S140 est une surface annulaire ayant des contours extérieur et intérieur elliptiques. La surface S140 du bord 140 comporte un relief 142, qui s'étend autour de l'orifice 014. Ce relief 142 délimite le contour de l'orifice 014. En fonctionnement, l'air comprimé passant dans le conduit 20 circule à l'intérieur du manchon 14. Le manchon délimite donc un passage d'air P14 qui s'étend entre les deux orifices 014 et O'14 du manchon 14. Le passage d'air P14 est un passage central, ou interne du manchon 14, qui relie le conduit amont et le conduit aval de la soufflette. Les orifices 014 et O'14 constituent les extrémités opposées du passage P14.A sleeve 14 is immobilized inside the conduit 20b of the body 2. This sleeve 14 is better visible at the figure 7 , where he is represented alone. The sleeve 14 is hollow and comprises two opposite orifices 014 and O'14 for the passage of compressed air. The orifices 014 and O'14 are respectively disposed at the downstream and upstream ends of the sleeve 14. The sleeve 14 is generally tubular and is centered on an axis X14 which is parallel, or even coincidental, with the axis X20b in the configuration installed in the conduit 20b. The sleeve 14 thus extends parallel to the axis X20b and comprises an edge 140 bevelled. This edge 140 is a downstream edge of the sleeve 14 and has a surface S140. This surface S140 is an annular surface having elliptical outer and inner contours. The surface S140 of the edge 140 has a relief 142, which extends around the orifice 014. This relief 142 delimits the contour of the orifice 014. In operation, the compressed air passing through the conduit 20 circulates to the Inside the sleeve 14. The sleeve therefore delimits an air passage P14 which extends between the two orifices O14 and O'14 of the sleeve 14. The air passage P14 is a central or internal passage of the sleeve 14, which connects the upstream duct and the downstream duct of the blower. The orifices 014 and O'14 constitute the opposite ends of the passage P14.

Par ailleurs, le manchon 14 est élastiquement déformable, notamment au niveau de la surface S140 et du relief 142. Le manchon 14 est de préférence réalisé dans un matériau élastique, comme de la matière plastique ou du caoutchouc. Il peut également être réalisé dans un matériau rigide et comporter, au niveau du bord biseauté 140, un anneau élastique à la place du relief 142.Furthermore, the sleeve 14 is elastically deformable, especially at the surface S140 and the relief 142. The sleeve 14 is preferably made of an elastic material, such as plastic or rubber. It may also be made of a rigid material and comprise, at the beveled edge 140, an elastic ring instead of the relief 142.

Le manchon 14 comprend une collerette 144 de positionnement du manchon 14 à l'intérieur du conduit 20b. En effet, en configuration assemblée du manchon 14 dans le conduit 20b, la collerette 144 bute contre un épaulement 24 du corps 2. Cet épaulement 24 est dirigé vers l'intérieur du conduit 20b et entraine une réduction de la section du conduit 20b dans la direction aval. Ainsi, le manchon 14 est immobilisé en translation. Le manchon 14 comporte également une nervure 146 qui s'étend, parallèlement à l'axe X14, à partir de la collerette 144 et en direction du bord biseauté 140. Cette nervure 146 est une nervure d'indexation angulaire du manchon 14 à l'intérieur du conduit 20b. En effet, cette nervure 146 est prévue pour être insérée dans une rainure correspondante 26 ménagée dans le conduit 20b. De cette manière, le manchon 14 est immobilisé en rotation à l'intérieur du conduit 20b dans la position angulaire requise.The sleeve 14 comprises a collar 144 for positioning the sleeve 14 inside the conduit 20b. Indeed, in assembled configuration of the sleeve 14 in the conduit 20b, the collar 144 abuts against a shoulder 24 of the body 2. This shoulder 24 is directed towards the inside of the conduit 20b and causes a reduction of the section of the conduit 20b in the downstream direction. Thus, the sleeve 14 is immobilized in translation. The sleeve 14 also comprises a rib 146 which extends, parallel to the axis X14, from the collar 144 and towards the beveled edge 140. This rib 146 is an angular indexing rib of the sleeve 14 to the inside the conduit 20b. Indeed, this rib 146 is provided to be inserted into a corresponding groove 26 formed in the conduit 20b. In this way, the sleeve 14 is immobilized in rotation inside the conduit 20b in the required angular position.

Le manchon 14 comprend une extrémité amont 148 de raccordement avec un about 12 : cette extrémité du manchon, opposée au trou 22 est apte à coopérer de manière étanche avec la surface intérieure de l'about 12 par emmanchement des deux éléments. L'about 12 permet de raccorder la soufflette 1 à un tuyau d'alimentation en air comprimé, qui n'est pas représenté sur les figures. Le raccordement entre l'about 12 et le tuyau d'alimentation en air comprimé est un raccordement de type mâle/femelle. L'about 12 s'étend selon un axe X12 qui est parallèle, voire confondu avec l'axe X20b. L'about 12 dépasse le corps 2 et est immobilisé à l'intérieur du conduit 20b au moyen d'un cavalier 10, qui permet de le fixer au corps 2.The sleeve 14 comprises an upstream end 148 of connection with an end 12: this end of the sleeve, opposite the hole 22 is adapted to cooperate sealingly with the inner surface of the end 12 by fitting of the two elements. The end 12 connects the blower 1 to a compressed air supply pipe, which is not shown in the figures. The connection between the end 12 and the compressed air supply pipe is a male / female type connection. The end 12 extends along an axis X12 which is parallel, or even coincident with the axis X20b. The end 12 passes the body 2 and is immobilized inside the conduit 20b by means of a jumper 10, which makes it possible to fix it to the body 2.

Comme visible à la figure 6, le cavalier 10 est de forme symétrique par rapport à l'axe Y8. Le cavalier 10 « chevauche » l'about 12, c'est-à-dire qu'il est monté autour d'une gorge périphérique 120 creusée dans l'about 12. Plus précisément, il comprend une paroi arrondie 102, qui est complémentaire de la gorge 120 et qui entoure plus de la moitié de la circonférence de la gorge 120. De cette manière, le cavalier 10 et l'about 12 sont solidarisés en translation selon l'axe X12 du fait de l'élasticité du cavalier. Or, comme visible à la figure 3, le cavalier 10 est inséré avec un faible jeu dans un logement traversant 28 pratiqué dans le corps 2. Ce logement 28 s'étend parallèlement à l'axe Y8 et permet d'immobiliser le cavalier 10 en translation selon l'axe X12. Par conséquent, le cavalier 10 empêche l'about 12 de coulisser dans le conduit 20b. Le cavalier 10 comprend également deux épaulements 104, qui sont orientés vers la gâchette 4, à l'opposé par rapport à la paroi arrondie 102. Dans la direction de la gâchette 4, les épaulements 104 réduisent la largeur du cavalier 10, cette largeur étant mesurée parallèlement à l'axe Z6. Une extrémité du ressort 8 prend appui sur ces épaulements 104, l'autre extrémité du ressort 8 étant en appui contre deux épaulements de la gâchette 4. Ainsi, le cavalier 10 est maintenu plaqué dans son logement 28, c'est-à-dire contre l'about 12 par l'effort élastique exercé par le ressort 8. Autrement formulé, la paroi arrondie 102 est maintenue dans la gorge 120.As visible at figure 6 , the jumper 10 is of symmetrical shape with respect to the axis Y8. The jumper 10 "overlaps" the end 12, that is to say that it is mounted around a peripheral groove 120 dug in the end 12. More specifically, it comprises a rounded wall 102, which is complementary of the groove 120 and which surrounds more than half of the circumference of the groove 120. In this way, the rider 10 and the abutment 12 are secured in translation along the axis X12 due to the elasticity of the rider. However, as visible in the figure 3 , the jumper 10 is inserted with a small clearance in a through housing 28 formed in the body 2. This housing 28 extends parallel to the axis Y8 and makes it possible to immobilize the jumper 10 in translation along the axis X12. Therefore, the jumper 10 prevents the end 12 from sliding in the conduit 20b. The jumper 10 also comprises two shoulders 104, which are oriented towards the trigger 4, opposite to the rounded wall 102. In the direction of the trigger 4, the shoulders 104 reduce the width of the jumper 10, this width being measured parallel to the Z6 axis. One end of the spring 8 bears on these shoulders 104, the other end of the spring 8 being supported against two shoulders of the trigger 4. Thus, the rider 10 is kept pressed into its housing 28, that is to say against the end 12 by the elastic force exerted by the spring 8. Otherwise formulated, the rounded wall 102 is held in the groove 120.

Un organe de fermeture 16 est disposé à l'intérieur du trou 22 du corps 2. Cet organe de fermeture 16, également appelé « piston », est globalement de forme cylindrique et s'étend selon un axe Y16 parallèle, voire confondu avec l'axe Y22 sur lequel est centré l'alésage 22. L'organe de fermeture 16 est mobile en translation parallèlement à l'axe Y22 entre une position fermée, où il bloque le passage de l'air dans le conduit 20 et une position ouverte, où l'air est libre de circuler entre le conduit amont 20b et le conduit aval 20a. Dans la position ouverte, qui est une position de soufflage, la soufflette 1 expulse de l'air.A closure member 16 is disposed inside the hole 22 of the body 2. This closure member 16, also called "piston", is generally cylindrical in shape and extends along a parallel axis Y16, or even coincides with the Y22 axis on which is centered the bore 22. The closure member 16 is movable in translation parallel to the axis Y22 between a closed position, where it blocks the passage of air in the conduit 20 and an open position, where the air is free to flow between the upstream duct 20b and the downstream duct 20a. In the open position, which is a blow position, the blow gun 1 expels air.

L'organe de fermeture 16 est prévu pour coopérer avec le manchon 14 en position fermée. A cet effet, l'organe 16 comprend un bord biseauté 166 qui est complémentaire du bord biseauté 140 du manchon 14, c'est-à-dire que le bord 166 est configuré pour venir en appui plan contre le bord 140 en position fermée. Le bord 166 est un bord elliptique plein, configuré pour venir en contact étanche avec le bord 140 du manchon 14 en position fermée. Plus précisément, le bord biseauté 166 de l'organe de fermeture 16 est adapté pour obturer l'orifice 014 du passage P14 en position fermée, en formant avec le manchon 14 un contact étanche. Dans cette position l'air comprimé n'est plus libre de circuler entre le conduit amont et le conduit aval. La surface S140 du bord 140 forme donc une surface de contact entre le manchon 14 et l'organe 16.The closure member 16 is provided to cooperate with the sleeve 14 in the closed position. For this purpose, the member 16 comprises a beveled edge 166 which is complementary to the beveled edge 140 of the sleeve 14, that is to say that the edge 166 is configured to bear flat against the edge 140 in the closed position. The edge 166 is a solid elliptical edge, configured to come into sealing contact with the edge 140 of the sleeve 14 in the closed position. More specifically, the beveled edge 166 of the closure member 16 is adapted to close the orifice 014 of the passage P14 in the closed position, forming with the sleeve 14 a sealed contact. In this position the compressed air is no longer free to circulate between the upstream duct and the downstream duct. The surface S140 of the edge 140 thus forms a contact surface between the sleeve 14 and the member 16.

Bien que non représenté, l'invention prévoit que le bord 166 de l'organe de fermeture 16 et le bord 140 du manchon 14 puissent être concaves, convexes ou autrement irréguliers, mais complémentaires pour coopérer et former une surface de contact étanche en position fermée de l'organe de fermeture 16. Ces configurations de bords 166 et 140 présentent une surface de contact globalement disposée dans un plan P1 oblique par rapport à un plan P2 perpendiculaire au conduit 20b.Although not shown, the invention provides that the edge 166 of the closure member 16 and the edge 140 of the sleeve 14 may be concave, convex or otherwise irregular, but complementary to cooperate and form a sealed contact surface in the closed position of the closure member 16. These edge configurations 166 and 140 have a contact surface generally disposed in a plane P1 oblique with respect to a plane P2 perpendicular to the conduit 20b.

Le contact entre le manchon 14 et l'organe 16 est d'autant plus étanche du fait de la présence du relief 142, qui garantit la déformation du manchon élastique aux abords de l'orifice 014 sur l'ensemble de sa périphérie. En effet, lors du contact entre le manchon 14 et l'organe de fermeture 16, le manchon 14 est sollicité élastiquement en compression selon sa direction axiale X14 du fait de la présence du relief 142. Ainsi, le manchon 14, cherchant à reprendre sa forme initiale par retour élastique, exerce sur l'organe de fermeture 16 un effort opposé dirigé parallèlement à l'axe X14, ce qui assure un contact serré avec l'organe 16. L'organe de fermeture présente donc, par son relief 142, une surface de contact déformable qui réalise l'étanchéité sur l'ensemble de la périphérie de l'orifice 014.The contact between the sleeve 14 and the member 16 is all the more tight because of the presence of the relief 142, which ensures the deformation of the elastic sleeve around the orifice 014 over its entire periphery. Indeed, during the contact between the sleeve 14 and the closure member 16, the sleeve 14 is resiliently biased in compression in its axial direction X14 due to the presence of the relief 142. Thus, the sleeve 14, seeking to resume its initial form by springback, exerts on the closure member 16 an opposite force directed parallel to the axis X14, which ensures a tight contact with the member 16. The closure member therefore has, by its relief 142, a deformable contact surface which seals the entire periphery of the orifice 014.

La surface de contact S140 entre le manchon 14 et l'organe de fermeture 16 est une surface annulaire, ce qui assure une étanchéité optimale. Cette surface a des contours intérieur et extérieur elliptiques et est disposée très proche d'un plan P1, ou dans un plan P1 oblique par rapport à un plan P2 perpendiculaire au conduit 20b. Plus précisément, le plan P1 marque avec le plan P2 un angle A1 environ égal à 45°. Cependant, l'angle A1 est en pratique compris entre 20° et 70°.The contact surface S140 between the sleeve 14 and the closure member 16 is an annular surface, which ensures an optimum seal. This surface has elliptical inner and outer contours and is disposed very close to a plane P1, or in a plane P1 oblique with respect to a plane P2 perpendicular to the conduit 20b. More specifically, the plane P1 marks with the plane P2 an angle A1 approximately equal to 45 °. However, the angle A1 is in practice between 20 ° and 70 °.

Le contour intérieur de la surface annulaire est telle qu'une ellipse de largeur a et de longueur b pour un manchon dont le diamètre passage est de valeur a. Pour un manchon dont le plan P1 est à 45°, la longueur de l'ellipse sera égale à b=a√2. Dans cette configuration qui est une configuration préférentielle, la surface de contact sera à minima égale à la surface de l'ellipse intérieure telle que a/2 x b/2 x Π, soit a2 x √2 x Π x 0.25. Dans les configurations connues, où l'étanchéité est formée perpendiculairement par rapport au passage de fluide, dont le diamètre de passage circulaire est de valeur a, la surface d'étanchéité est égale à (a/2)2 x Π = a2 x Π x 0.25. Pour un même diamètre de passage, la surface d'étanchéité réalisée au bout d'un manchon en biseau à 45° est donc multipliée par √2, soit une augmentation d'environ 41%. Cette configuration permet ainsi d'augmenter le périmètre d'étanchéité de façon non négligeable sans augmenter l'encombrement des conduits de passage et de déformer de façon optimisée le manchon pour faciliter la prise d'étanchéité de l'organe de fermeture.The inner contour of the annular surface is such that an ellipse of width a and of length b for a sleeve whose passage diameter is of value a. For a sleeve whose plane P1 is at 45 °, the length of the ellipse will be equal to b = a√2. In this configuration which is a preferred configuration, the contact surface will be at least equal to the surface of the inner ellipse such that a / 2 xb / 2 x Π, that is to say 2 x √2 x Π x 0.25. In known configurations, where the seal is formed perpendicular to the fluid passage, whose circular passage diameter is a value, the sealing surface is equal to (a / 2) 2 x Π = a 2 x Π x 0.25. For the same diameter of passage, the sealing surface made at the end of a bevel sleeve 45 ° is multiplied by √2, an increase of about 41%. This configuration thus makes it possible to increase the sealing perimeter in a non-negligible way without increasing the bulk of the passage ducts and to deform the sleeve in an optimized manner to facilitate the sealing engagement of the closure member.

L'organe de fermeture 16 comprend une base 160 qui est opposée au bord biseauté 166 le long de l'axe Y16. Cette base 160 fait saillie de manière périphérique par rapport au reste du corps de l'organe de fermeture 16. Elle est globalement rectangulaire et est en appui contre un poussoir 40 de la gâchette 4. Le poussoir 40 est une partie saillante de la gâchette 4 dirigée vers le corps 2.The closure member 16 comprises a base 160 which is opposite the beveled edge 166 along the axis Y16. This base 160 protrudes peripherally with respect to the rest of the body of the closure member 16. It is generally rectangular and bears against a pusher 40 of the trigger 4. The pusher 40 is a protruding portion of the trigger 4 directed towards the body 2.

L'organe de fermeture 16 comprend, environ au milieu, une gorge périphérique 162 de réception d'un joint d'étanchéité 164. Ce joint d'étanchéité 164 permet d'éviter que de l'air s'infiltre dans le trou 22 en fonctionnement. Un seul joint d'étanchéité est donc utilisé dans la construction de la soufflette 1, ce qui facilite le montage.The closure member 16 comprises, approximately in the middle, a peripheral groove 162 for receiving a seal 164. This seal 164 makes it possible to prevent air from entering the hole 22 operation. A single seal is used in the construction of the gun 1, which facilitates assembly.

Comme visible à la figure 4, la base rectangulaire 160 de l'organe de fermeture 16 est partiellement engagée dans deux logements traversants 44 délimités dans la gâchette 4. Les logements 44 sont opposés l'un par rapport à l'autre par rapport à un plan P3 de la soufflette et suivant une direction parallèle à l'axe Z6. Le plan P3 est un plan perpendiculaire au plan P2 et à l'axe Z6, qui contient les axes Y16 et Y22. Le plan P3 est par ailleurs le plan de coupe de la soufflette 2 aux figures 1 à 3. Ces logements 44 sont des ouvertures rectangulaires disposées de part et d'autre de l'organe 16. Ils présentent une largeur, mesurée parallèlement à l'axe Y16, qui est supérieure à l'épaisseur de la base 160. Ainsi, un jeu de contact J existe entre la base 160 et un bord de contact 440 des logements 44. Le bord 440 est le bord des logements 44 le plus près du conduit amont 20b et qui est opposé au poussoir 40. Le bord 440 est le bord susceptible de venir au contact de la base 160 de l'organe 16 lors de l'actionnement de la gâchette 4. Dans l'exemple des figures, le bord 440 est le bord des logements 44 le plus proche de la base 160 mais il peut en être différemment. Le jeu de contact J est un jeu axial qui évolue en fonction de la disposition de la base 160 dans les logements 44. En position fermée, ce jeu J est de l'ordre de 0,5 mm.As visible at figure 4 , the rectangular base 160 of the closing member 16 is partially engaged in two through-holes 44 delimited in the trigger 4. The housings 44 are opposite one another with respect to a plane P3 of the blowgun and in a direction parallel to the axis Z6. The plane P3 is a plane perpendicular to the plane P2 and to the axis Z6, which contains the axes Y16 and Y22. The plane P3 is also the cutting plane of the blower 2 to Figures 1 to 3 . These housings 44 are rectangular openings disposed on either side of the member 16. They have a width, measured parallel to the axis Y16, which is greater than the thickness of the base 160. Thus, a set of contact J exists between the base 160 and a contact edge 440 of the housing 44. The edge 440 is the edge of the housing 44 closest to the upstream conduit 20b and which is opposite the pusher 40. The edge 440 is the edge likely to come in contact with the base 160 of the member 16 during the actuation of the trigger 4. In the example of the figures, the edge 440 is the edge of the housing 44 closest to the base 160, but it may be differently . The contact clearance J is an axial clearance which changes as a function of the disposition of the base 160 in the housings 44. In the closed position, this clearance J is of the order of 0.5 mm.

Le jeu axial J dont dispose l'organe de fermeture 16 à l'intérieur du trou 22 lui permet de prendre contact de manière optimale, c'est-à-dire de la manière la plus étanche possible, avec le manchon 14 en position fermée.The axial clearance J available to the closure member 16 inside the hole 22 allows it to make optimal contact, that is to say, as tightly as possible, with the sleeve 14 in the closed position. .

Comme expliqué ci-dessus, dans le cas où le manchon 14 est rigide, celui-ci porte au niveau de son bord biseauté 140 un anneau élastique. Cet anneau élastique est comprimé lors du contact avec l'organe de fermeture 16 pour obtenir un contact serré entre les deux pièces, et une étanchéité maximale.As explained above, in the case where the sleeve 14 is rigid, it carries at its bevelled edge 140 an elastic ring. This elastic ring is compressed during contact with the closure member 16 to obtain a tight contact between the two parts, and a maximum seal.

Par ailleurs, l'organe de fermeture 16 est guidé en translation dans le conduit 22. En effet, comme visible à la figure 5, la base rectangulaire 160 est reçue dans une cavité 42 de la gâchette 4. Cette cavité 42 épouse globalement la forme de la base 160, de manière que l'organe de fermeture est immobile en rotation autour de l'axe Y16 à l'intérieur du trou 22. En outre, la base 160 comprend deux épaulements, qui délimitent une portion 160a de largeur, mesurée parallèlement à l'axe Z6, rétrécie par rapport au reste de la base 160. Cela permet d'indexer correctement l'organe de fermeture 16 à l'intérieur du trou 22, c'est-à-dire de positionner angulairement l'organe de fermeture 16 pour que son bord biseauté 166 soit parfaitement en contact plan avec le bord 140 du manchon 14 en position fermée.Moreover, the closure member 16 is guided in translation in the duct 22. Indeed, as visible in FIG. figure 5 , the rectangular base 160 is received in a cavity 42 of the trigger 4. This cavity 42 generally matches the shape of the base 160, so that the closure member is immobile in rotation about the axis Y16 inside. In addition, the base 160 comprises two shoulders, which delimit a portion 160a of width, measured parallel to the axis Z6, narrowed relative to the rest of the base 160. This allows to correctly index the body of closing 16 inside the hole 22, that is to say to angularly position the closure member 16 so that its bevelled edge 166 is perfectly in plane contact with the edge 140 of the sleeve 14 in the closed position.

Au repos, c'est-à-dire dans la configuration des figures 1 et 2, le ressort 8 exerce sur la gâchette 4 un effort F3 dirigé selon l'axe Y8. Cet effort de charge élastique F3 tend à faire basculer la gâchette 4 autour de l'arbre 6 selon une direction horaire à la figure 2. Cependant, le mouvement de la gâchette 4 est limité dans cette direction par le corps 2. Par conséquent, le poussoir 40 appuie sur l'organe de fermeture 16 selon une direction F4 dirigée parallèlement à l'axe Y16, et en direction du conduit 20b. L'effort F4 d'appui du poussoir 40 sur l'organe de fermeture 16 permet de maintenir l'organe de fermeture 16 en position fermée sous la pression de l'air comprimé. En effet, l'air comprimé provenant de l'about 12 exerce une pression F5 sur le bord biseauté 166 de l'organe de fermeture 16 et provoque des efforts de pression sur la surface de contact 166 de l'organe de fermeture 16 qui génèrent une composante d'effort selon l'axe Y16 en direction du poussoir 40. L'organe de fermeture 16 se comporte comme un coin, c'est-à-dire que la pression exercée par l'air comprimé dans le conduit 20b sur l'organe 16 tend à déplacer l'organe de fermeture 16 selon une direction opposée au conduit 20 et selon l'axe Y16. Cependant, l'effort F4 d'appui du poussoir 40 est prépondérant devant la pression F5 de l'air comprimé s'exerçant sur l'organe de fermeture 16, de sorte que la gâchette 4 ne peut pas basculer seule en direction du corps 2, c'est à dire en configuration de soufflage.At rest, that is to say in the configuration of figures 1 and 2 the spring 8 exerts on the trigger 4 a force F3 directed along the axis Y8. This elastic load force F3 tends to tilt the trigger 4 around the shaft 6 in a clockwise direction to the figure 2 . However, the movement of the trigger 4 is limited in this direction by the body 2. Therefore, the pusher 40 presses the closure member 16 in a direction F4 directed parallel to the axis Y16, and in the direction of the conduit 20b . The support force F4 of the pusher 40 on the closure member 16 keeps the closure member 16 in the closed position under the pressure of the compressed air. Indeed, the compressed air coming from the abutment 12 exerts a pressure F5 on the beveled edge 166 of the closure member 16 and causes pressure forces on the contact surface 166 of the closure member 16 which generate a component of force along the axis Y16 in the direction of the pusher 40. The closure member 16 behaves like a wedge, that is to say that the pressure exerted by the compressed air in the conduit 20b on the member 16 tends to move the closure member 16 in a direction opposite to the conduit 20 and along the axis Y16. However, the support force F4 of the pusher 40 is preponderant in front of the pressure F5 of the compressed air exerted on the closure member 16, so that the trigger 4 can not rock alone towards the body 2 , ie in blowing configuration.

Pour expulser de l'air comprimé, l'utilisateur tire sur la gâchette 4 en serrant le poing. Ainsi, la gâchette 4 quitte sa configuration relâchée et pivote autour de l'arbre 6 à l'encontre de l'effort F3 de charge élastique du ressort 8, comme représenté par les flèches F1 et F2 à la figure 2. En pivotant, le poussoir 40 s'éloigne de l'organe de fermeture 16, c'est-à-dire qu'il n'exerce plus d'effort de retenue F4. Ainsi, si la pression de l'air comprimé injecté dans le conduit 20 est suffisante, l'organe de fermeture 16 est entrainé en translation selon une direction F7. Cette direction F7 est orientée parallèlement à l'axe Y16 du fait de la présence du bord biseauté 166, qui joue le rôle d'un coin. Le déplacement de l'organe de fermeture 16 dans la direction F7 entraine la rupture du contact étanche entre l'organe de fermeture 16 et le manchon 14. L'air peut circuler, comme représenté par les flèches F6 à la figure 3.To expel compressed air, the user pulls the trigger 4 by clenching his fist. Thus, the trigger 4 leaves its relaxed configuration and pivots around the shaft 6 against the load F3 elastic load of the spring 8, as represented by the arrows F1 and F2 at the figure 2 . By pivoting, the pusher 40 moves away from the closure member 16, that is to say that it no longer exerts a retaining force F4. Thus, if the pressure of the compressed air injected into the duct 20 is sufficient, the closure member 16 is driven in translation in a direction F7. This direction F7 is oriented parallel to the axis Y16 due to the presence of the beveled edge 166, which acts as a wedge. The displacement of the closing member 16 in the direction F7 causes the rupture of the sealing contact between the closure member 16 and the sleeve 14. The air can circulate, as represented by the arrows F6 at the figure 3 .

Cependant, dans le cas où la pression de l'air injecté dans le conduit 20b est insuffisante, l'organe de fermeture 16 est toutefois entrainé par la gâchette 4 en translation selon la direction F7. En effet, lors du basculement de la gâchette 4 en direction du corps 2, le jeu J existant entre la base 160 de l'organe de fermeture 16 et les logements 44 de la gâchette 4 est rattrapé et la base 160 vient au contact des bords 440 des logements 44, ce qui entraine l'organe de fermeture 16 en translation. L'avantage d'utiliser un bord 166 de fermeture du conduit 20 incliné assure que le déplacement de l'organe de fermeture 16 ne se fait pas en opposition avec la pression de l'air comprimé injecté dans l'about 12. Ainsi, la pression de l'air comprimé accompagne le déplacement de l'organe de fermeture 16 entre sa position fermée et sa position ouverte. L'opérateur n'a donc pas à forcer pour presser la gâchette 4 et la soufflette 1 est facilement manipulable.However, in the case where the air pressure injected into the conduit 20b is insufficient, the closure member 16 is however driven by the trigger 4 in translation in the direction F7. Indeed, during the tilting of the trigger 4 towards the body 2, the clearance J existing between the base 160 of the closure member 16 and the housing 44 of the trigger 4 is overtaken and the base 160 comes into contact with the edges 440 of the housing 44, which causes the closing member 16 in translation. The advantage of using a closing edge 166 of the inclined conduit 20 ensures that the displacement of the closure member 16 is not in opposition to the pressure of the compressed air injected into the end 12. Thus, the pressure of the compressed air accompanies the movement of the closure member 16 between its closed position and its open position. The operator does not have to force to squeeze the trigger 4 and the gun 1 is easily manipulated.

Autrement dit, les efforts nécessaires pour ouvrir le conduit 20 ne doivent pas vaincre l'effort de pression F5 exercé par l'air en amont et l'opérateur n'agit pas contre la pression du réseau lorsqu'il souhaite expulser de l'air par la soufflette. De ce fait, le soufflage peut être réalisé de manière progressive et maîtrisé.In other words, the forces required to open the conduit 20 must not overcome the pressure force F5 exerted by the air upstream and the operator does not act against the pressure of the network when he wishes to expel air by the blower. As a result, the blowing can be carried out in a progressive and controlled manner.

Le serrage de la gâchette 4 amène la soufflette 1 dans la configuration de la figure 3. La gâchette 4 se trouve alors dans la configuration de soufflage, où l'air circule dans le conduit 20.Clamping the trigger 4 brings the blower 1 into the configuration of the figure 3 . The trigger 4 is then in the blowing configuration, where the air circulates in the duct 20.

Lorsque l'opérateur a fini d'utiliser la soufflette 1, celui-ci relâche la pression sur la gâchette 4. La gâchette 4 revient alors dans sa configuration relâchée sous l'effort F3 de retour élastique du ressort 8. Le ressort 8 se détend. Ainsi, la gâchette 4 pivote autour de l'arbre 6 et le poussoir 40 appuie sur l'organe de fermeture 16 pour l'entrainer en translation à l'intérieur du trou 22, jusqu'à que celui-ci parvienne au contact du bord biseauté 140 du manchon 14. Le manchon 14 et l'organe de fermeture 16 sont alors de nouveau en contact étanche et le passage de l'air dans l'orifice 014 du manchon 14 est bloqué.When the operator has finished using the gun 1, it releases the pressure on the trigger 4. The trigger 4 then returns to its relaxed configuration under the spring return force F3 of the spring 8. The spring 8 relaxes . Thus, the trigger 4 pivots around the shaft 6 and the pusher 40 presses the closure member 16 to drive it in translation inside the hole 22 until it comes into contact with the edge Beveled 140 of the sleeve 14. The sleeve 14 and the closure member 16 are then again in sealing contact and the passage of air in the orifice 014 of the sleeve 14 is blocked.

Sur la figure 9 est représenté un deuxième mode de réalisation d'une soufflette à air comprimé selon l'invention. Par souci de concision, seuls les éléments différents du premier mode de réalisation sont décrits ci-dessous. De plus, les éléments identiques ou qui fonctionnent de manière analogue par rapport à la soufflette du premier mode de réalisation conservent leur référence numérique alors que les éléments additionnels ou qui fonctionnent différemment par rapport à ceux du premier mode de réalisation portent d'autres références numériques.On the figure 9 is shown a second embodiment of a compressed air blower according to the invention. For the sake of brevity, only the different elements of the first embodiment are described below. In addition, the elements that are identical or that operate in a similar manner with respect to the blower of the first embodiment retain their numerical reference while the additional elements or elements that operate differently with respect to those of the first embodiment carry other numerical references. .

La soufflette à air comprimé 1 de la figure 9 diffère de celle du premier mode de réalisation en ce que le corps 2 comprend une poignée 30 de manipulation de la soufflette à air comprimé 1. Cette poignée 30 facilite la prise en main de la soufflette 1. En outre, la soufflette 1 comprend un corps 2 ayant une partie coudée 2a sur laquelle une buse 36 est encliquetée. Par encliquetage, on entend qu'il peut s'agir d'un mécanisme de verrouillage élastique au montage, d'un pion ou de griffes périphériques de la buse configurées pour pénétrer dans une rainure curviligne ou coudée du corps. La buse 36 peut également être vissée à l'extrémité de la partie coudée 2a du corps 2. Par ailleurs, la soufflette 1 de ce mode de réalisation comprend un about 38 qui est également encliqueté à l'intérieur du corps 2. L'avantage de ce mode de réalisation est que la buse est interchangeable et permet notamment d'adapter la forme du jet.The compressed air gun 1 of the figure 9 differs from that of the first embodiment in that the body 2 comprises a handle 30 for handling the air blow gun 1. This handle 30 facilitates the grip of the blow gun 1. In addition, the blow gun 1 comprises a body 2 having a bent portion 2a on which a nozzle 36 is snapped. Snap-fastening means that it may be an elastic locking mechanism on assembly, a pin or peripheral claws of the nozzle configured to penetrate into a curvilinear groove or bent body. The nozzle 36 may also be screwed to the end of the bent portion 2a of the body 2. In addition, the blow gun 1 of this embodiment comprises a butt 38 which is also snapped inside the body 2. The advantage of this embodiment is that the nozzle is interchangeable and allows in particular to adapt the shape of the jet.

Sur la figure 10 est représenté un troisième mode de réalisation d'une soufflette à air comprimé 1. Dans ce troisième mode, la soufflette 1 comprend un corps 2 comprenant également une poignée de manipulation 30. De plus, la soufflette 1 comprend une buse d'éjection d'air comprimé qui est réalisée en deux parties. En effet, une première partie 34 est encliquetée sur une partie coudée 2a du corps 2 et une deuxième partie 32 est insérée dans un conduit 20a de la partie coudée 2a et est immobilisée par la partie 34 à l'aide de moyens de retenue appartenant à la partie 34. En variante non représentée, l'about 12 est monobloc avec le corps 2.On the figure 10 there is shown a third embodiment of a compressed air blower 1. In this third mode, the blower 1 comprises a body 2 also comprising a handling handle 30. In addition, the blower 1 comprises an ejection nozzle of compressed air that is made in two parts. Indeed, a first portion 34 is snapped onto a bent portion 2a of the body 2 and a second portion 32 is inserted into a conduit 20a of the bent portion 2a and is immobilized by the portion 34 by means of retaining means belonging to Part 34. In variant not shown, the end 12 is integral with the body 2.

En variante non représentée, les logements 44 sont borgnes.In variant not shown, the housings 44 are blind.

En variante non représentée, l'organe de fermeture 16 peut être mobile dans un trou qui débouche dans le conduit 20b en amont par rapport au manchon 14, et obturer le bord amont 148 du manchon 14 et non le bord aval 140 comme présenté précédemment.In variant not shown, the closure member 16 can be movable in a hole which opens into the conduit 20b upstream relative to the sleeve 14, and close the upstream edge 148 of the sleeve 14 and not the downstream edge 140 as previously presented.

En variante non représentée, l'organe de fermeture 16 peut ne pas disposer de bord biseauté mais d'un bord perpendiculaire à son axe et s'étendre selon un axe de translation perpendiculaire à la surface de contact S140 du bord biseauté du manchon 14.As a variant not shown, the closure member 16 may not have a beveled edge but an edge perpendicular to its axis and extend along a translation axis perpendicular to the contact surface S140 of the beveled edge of the sleeve 14.

En variante non représentée, le manchon 14 peut ne pas disposer de bord biseauté et la surface de contact S140 peut être telle qu'une surface annulaire ayant des contours intérieur et extérieur circulaires.Alternatively not shown, the sleeve 14 may not have beveled edge and the contact surface S140 may be such that an annular surface having circular inner and outer contours.

En variante non représentée, l'organe de fermeture 16 dispose d'un léger jeu en rotation autour de son axe X16, ce qui peut permettre d'améliorer la prise de contact avec le manchon 14, c'est-à-dire rattraper un éventuel défaut de coplanéité entre les surfaces de contact du manchon 14 et de l'organe 16.In variant not shown, the closure member 16 has a slight play in rotation about its axis X16, which can improve the contact with the sleeve 14, that is to say, catch up with a possible lack of coplanarity between the mating surfaces of sleeve 14 and member 16.

Les caractéristiques techniques des variantes et modes de réalisation envisagés ci-dessus peuvent être combinées entre elles pour générer de nouveaux modes de réalisation de l'invention.The technical features of the variants and embodiments envisaged above can be combined with each other to generate new embodiments of the invention.

Claims (12)

Soufflette à air comprimé (1), comprenant : - un corps (2), comportant un conduit (20) de passage de l'air comprimé incluant un conduit amont (20b) qui s'étend selon un premier axe (X20b) et un conduit aval (20a) d'éjection d'air, et un trou (22), qui s'étend selon un deuxième axe (Y22) et qui débouche de manière oblique dans le conduit amont (20b), - un organe de fermeture (16), qui est mobile en translation, parallèlement au deuxième axe, à l'intérieur du trou entre une position fermée, où il bloque le passage de l'air dans le conduit et une position ouverte, où l'air est libre de circuler entre le conduit amont et le conduit aval, - une gâchette (4) de commande du déplacement de l'organe de fermeture, qui est manipulable entre une configuration relâchée, où elle maintient l'organe de fermeture en position fermée et une configuration de soufflage, où l'organe de fermeture est en position ouverte, - des moyens (8) de rappel de la gâchette vers sa configuration relâchée, caractérisée en ce qu'elle comprend, en outre, un manchon tubulaire (14), qui est immobilisé à l'intérieur du conduit amont (20b), qui s'étend parallèlement au premier axe (X20b) et qui délimite un passage d'air (P14) et en ce que l'organe de fermeture (16), en position fermée, est adapté pour obturer un orifice (014) du passage d'air (P14) en formant avec le manchon un contact étanche. Air blower (1), comprising: a body (2) comprising a duct (20) for the passage of compressed air including an upstream duct (20b) extending along a first axis (X20b) and a downstream duct (20a) for ejection of air, and a hole (22), which extends along a second axis (Y22) and which opens obliquely into the upstream duct (20b), - a closure member (16), which is movable in translation, parallel to the second axis, inside the hole between a closed position, where it blocks the passage of air in the conduit and an open position, where the air is free to circulate between the upstream duct and the downstream duct, a trigger (4) for controlling the movement of the closure member, which can be manipulated between a relaxed configuration, where it keeps the closure member in the closed position and a blow configuration, where the closure member is in open position, means (8) for returning the trigger towards its relaxed configuration, characterized in that it further comprises a tubular sleeve (14), which is immobilized inside the upstream conduit (20b), which extends parallel to the first axis (X20b) and which delimits an air passage (P14) and in that the closing member (16), in the closed position, is adapted to close an orifice (014) of the passage of air (P14) forming a sealed contact with the sleeve. Soufflette selon la revendication 1, caractérisée en ce que le manchon (14) délimite une surface de contact (S140) avec l'organe de fermeture (16), qui est disposée dans un plan (P1) oblique par rapport à un plan (P2) perpendiculaire au premier axe (X20b).Blow gun according to claim 1, characterized in that the sleeve (14) defines a contact surface (S140) with the closing member (16), which is arranged in a plane (P1) oblique with respect to a plane (P2 perpendicular to the first axis (X20b). Soufflette selon la revendication 2, caractérisée en ce que la surface de contact (S140) du manchon (14) est une surface annulaire ayant des contours intérieur et extérieur elliptiques.Blow gun according to claim 2, characterized in that the contact surface (S140) of the sleeve (14) is an annular surface having elliptical inner and outer contours. Soufflette selon l'une des revendications 2 et 3, caractérisée en ce que le manchon (14) et l'organe de fermeture (16) comprennent chacun un bord (140, 166) taillé en biseau et en ce que la surface de contact (S140) du manchon est délimitée sur son bord biseauté.Blowstem according to one of claims 2 and 3, characterized in that the sleeve (14) and the closing member (16) each comprise an edge (140, 166) cut in a bevel and that the contact surface ( S140) of the sleeve is delimited on its bevelled edge. Soufflette selon l'une des revendications 2 à 4, caractérisée en ce que la surface de contact (S140) du manchon comporte un relief (142), qui forme une surface d'étanchéité avec l'organe de fermeture (16) lorsque celui-ci est en position fermée.Blow gun according to one of Claims 2 to 4, characterized in that the contact surface (S140) of the sleeve comprises a relief (142), which forms a sealing surface with the closure member (16) when the latter it is in closed position. Soufflette selon l'une des revendications précédentes, caractérisée en ce qu'elle comprend un about (12) de raccordement à un tube d'alimentation en air comprimé, cet about étant adapté pour être fixé au corps (2) de la soufflette et étant apte à coopérer de manière étanche avec une extrémité (148) du manchon (14) opposée au trou (22).Blow gun according to one of the preceding claims, characterized in that it comprises an end (12) for connection to a tube for supplying compressed air, this end being adapted to be fixed to the body (2) of the blower and being adapted to cooperate sealingly with one end (148) of the sleeve (14) opposite the hole (22). Soufflette selon la revendication 6, caractérisée en ce qu'elle comprend des moyens (10, 8, 28) d'immobilisation de l'about (12) dans le conduit amont (20b), qui comprennent un cavalier (10) qui est immobilisé dans un logement (28) du corps par les moyens de rappel (8) de la gâchette et qui coopère avec une gorge périphérique (120) de l'about (12) pour bloquer le coulissement de l'about à l'intérieur du conduit amont (20b).Blow gun according to claim 6, characterized in that it comprises means (10, 8, 28) for immobilizing the abutment (12) in the upstream duct (20b), which comprise a rider (10) which is immobilized in a housing (28) of the body by the return means (8) of the trigger and which cooperates with a peripheral groove (120) of the end (12) to block the sliding of the end inside the conduit upstream (20b). Soufflette selon l'une des revendications précédentes, caractérisée en ce que l'organe de fermeture (16) est maintenu en position fermée par un poussoir (40) de la gâchette (4), qui est en appui contre une extrémité (160) de l'organe de fermeture opposée au conduit amont et en ce que le poussoir agit sur l'organe de fermeture selon le deuxième axe (Y22) du trou.Blow gun according to one of the preceding claims, characterized in that the closing member (16) is held in the closed position by a push-button (40) of the trigger (4), which bears against one end (160) of the closing member opposite the upstream duct and in that the pusher acts on the closing member along the second axis (Y22) of the hole. Soufflette selon l'une des revendications précédentes, caractérisée en ce qu'elle comprend des moyens (24, 146) d'immobilisation du manchon (14) en rotation à l'intérieur du conduit amont (20b), qui comprennent une nervure longitudinale (146) portée par le manchon et une rainure (24) de réception de cette nervure ménagée dans le corps de la soufflette.Blow gun according to one of the preceding claims, characterized in that it comprises means (24, 146) for immobilizing the sleeve (14) in rotation inside the upstream duct (20b), which comprise a longitudinal rib ( 146) carried by the sleeve and a groove (24) for receiving this rib formed in the body of the gun. Soufflette selon l'une des revendications précédentes, caractérisée en ce que la gâchette (4) comprend des moyens (44) d'entrainement de l'organe de fermeture (16) en translation vers sa position ouverte, en ce que ces moyens comprennent au moins un logement (44) de réception d'une base saillante (160) de l'organe de fermeture et en ce que la base saillante (160) est disposée à une extrémité opposée au conduit amont (20b) et est engagée dans le ou les logements (44) de la gâchette (4) avec un jeu axial (J), mesuré parallèlement au deuxième axe (Y22) du trou, entre la base (160) de l'organe de fermeture et un bord de contact (440) du ou des logements (44),Blow gun according to one of the preceding claims, characterized in that the trigger (4) comprises means (44) for driving the closure member (16) in translation towards its open position, in that these means comprise at least one least one housing (44) for receiving a protruding base (160) of the closure member and in that the projecting base (160) is disposed at an end opposite the upstream conduit (20b) and is engaged in the the housings (44) of the trigger (4) with an axial clearance (J), measured parallel to the second axis (Y22) of the hole, between the base (160) of the closure member and a contact edge (440) of the housing (44), Soufflette selon l'une des revendications précédentes, caractérisée en ce que le trou (22) de réception de l'organe de fermeture (16) s'étend selon son deuxième axe de manière perpendiculaire au premier axe (X20b) du conduit amont (20b).Blow gun according to one of the preceding claims, characterized in that the hole (22) for receiving the closing member (16) extends along its second axis perpendicularly to the first axis (X20b) of the upstream duct (20b ). Soufflette selon l'une des revendications précédentes, caractérisée en ce que le manchon (14) est en matériau élastique, notamment en matière plastique ou en caoutchouc.Blow gun according to one of the preceding claims, characterized in that the sleeve (14) is of elastic material, in particular of plastic or rubber.
EP15161599.4A 2014-03-31 2015-03-30 Compressed-air blower Active EP2926912B1 (en)

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FR1452825A FR3019066B1 (en) 2014-03-31 2014-03-31 COMPRESSED AIR BLOW GUN

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KR (1) KR102357230B1 (en)
CN (1) CN104941836B (en)
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SE540737C2 (en) * 2017-03-02 2018-10-23 Silvent Ab Blow gun
USD865120S1 (en) * 2017-05-29 2019-10-29 Silvent Ab Compressed air gun
KR102141119B1 (en) 2018-07-02 2020-08-05 (주)케맥스 Air Gun
US11406995B2 (en) 2019-01-25 2022-08-09 Graco Minnesota Inc. Material spray gun
DE102019116307A1 (en) * 2019-05-08 2020-11-12 Ecoclean Gmbh Cleaning device and method for cleaning components

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DK2926912T3 (en) 2017-10-23
EP2926912B1 (en) 2017-09-06
KR20150113904A (en) 2015-10-08
CA2886172A1 (en) 2015-09-30
US9511380B2 (en) 2016-12-06
FR3019066A1 (en) 2015-10-02
KR102357230B1 (en) 2022-01-28
FR3019066B1 (en) 2016-04-29
CN104941836B (en) 2019-10-25
ES2645213T3 (en) 2017-12-04
US20150273485A1 (en) 2015-10-01
CN104941836A (en) 2015-09-30
MX2015003884A (en) 2015-09-29
TWI649127B (en) 2019-02-01
TW201600173A (en) 2016-01-01
CA2886172C (en) 2022-08-23

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