FR2743326A1 - METHOD FOR FILLING AN INJECTOR, AFTER INJECTING A PRODUCT FOR TREATING WOOD IN SAID INJECTOR, AND DEVICE FOR CARRYING OUT SAID METHOD - Google Patents

Abstract

Method of closing an injector (1), after injection of a product for the treatment of wood using an injection gun (2) in a channel (13) axially passing through said injector (1) axially and the device allowing the implementation of the method. The device comprises in its channel (13) a valve (15) of substantially conical shape extended by a tail (16), directed towards the mouth (100) of said injector (1), capable of being gripped by the gripping means. (22) of the injector gun (2) and in that the head (2 ') of the injector gun (2) comprises on the one hand a hollow cylindrical body (21) inside which is incorporated the gripping means (22 ) and on the other hand a passage (23) for the treatment product formed between said gripping means (22) and the inner wall of the cylindrical body (21).

Description

The subject of the present invention is a process for closing off an injector,

  after injection of a product for the treatment of the wood in said injector, and the

  device for implementing said method.

  Currently used for the treatment of wood against insects, fungi or other

  different devices or processes.

  - The most effective processes for this treatment of wood are those which consist of driving, in holes made in the wood to be treated, injectors, similar to plugs or sockets, well anchored by means of annular projections and having a cylindrical channel passing through them axially, and wherein

  channel one injects a treatment liquid under high-

  pressure using a suitable injector gun.

  When the injection of the treatment liquid is complete, it is maintained under pressure in the wood by means of a non-return device consisting for example of a valve, a valve or a ball which closes the orifice of

  passage of the liquid in said injection pin.

  However, these devices have the disadvantage of not always completely closing the liquid passage orifice once the injection operation performed due to poor positioning.

  or blockages of the shutter piece.

  In addition, with such systems, this disadvantage may become more frequent as and when

repetition of injections.

  Document FR-A-2 560 106 discloses an injection device comprising a substantially elastic plastic sleeve provided with external projections and constituting the seat of a valve, external to the sleeve, comprising a central channel, which sleeve is intended firstly to be forced into a household channel in a material to be treated and secondly to receive the head of an injection gun including a punch whose diameter is slightly greater than the internal diameter of the central channel said valve, which valve and the sleeve being two independent parts at the time of injection. The method of implementation of the device consists, after pressing the socket into the cavity, to introduce into said socket, at its rear end, the head of the injection gun and to open the front end of said socket, valve seat by pushing the latter out of said socket, by means of the punch of the injection gun head forcibly engaged in the valve channel, so as to be able to inject the treatment product into the cavity, then to close the anterior end of said sleeve, after the injection phase, with the valve by bringing it back through the head of the injection gun, when

its removal from the socket.

  However, when the injection pressure is high the valve disengages from the head of the injection gun so that this device can be subjected to very low pressures. In addition, the valve which is outside the sleeve is not protected and deteriorates frequently before the implementation of said injector, and is likely to come off during handling. Finally, the punch of the injection gun head is very fragile and breaks at the slightest impact.

course of work.

  The present invention aims to remedy these drawbacks by proposing a sealing method and a

  device for carrying out said method.

  The method that is the subject of the present invention consists in operating a valve in an injector to close off the channel after the injection of a treatment product by means of an injection gun during the withdrawal.

of said injector gun.

  The device used comprises an injection gun, well known to those skilled in the art, whose head is cylindrical in shape and slightly conical at its upper part and in which there is integrated a gripping means of the valve of the injector by providing a space between said gripping means and the inner wall of the injection cone to pass the

treatment liquid.

  The injector is made of molded plastic, for example polyethylene or polyamide, and has a

  known interior and exterior architecture.

  It further comprises, in the injection channel, a valve of approximately conical shape extended by a tail directed towards the injection mouthpiece enabling said valve to be gripped by the gripping means

  of the gun injection head.

  The valve is made of molding and secured to the wall of the injection channel, at its end opposite the tail, by attachment points of

low resistance.

  These attachment points allow the valve to be held in the axis of the injector so that the tail is in alignment with the gripping means of the injection gun when it is inserted into the nozzle.

internal cavity of the injector.

  By introducing the conical head of the injection gun into the mouth of the injector, the gripping means grasps the tail, a simple additional pressure of the operator on the gun to break the points of attachment connecting the valve to the cavity

internal of the injector.

  The injection phase of the treatment liquid in the injector is completed, the pistol is withdrawn, and the valve, a portion of which is of a diameter greater than the internal diameter of the mouth of the injector, is blocked preventing the return of the injected liquid, an additional traction on the gun resulting in the separation of the valve of the means of

gripping of it.

  The advantages and features of the present invention will emerge more clearly from the

  description which follows and which refers to the attached drawing,

  which represents a non-limiting embodiment thereof.

  In the accompanying drawing: - Figure la shows a longitudinal sectional view of an injector and its non-return valve of the liquid. Figure lb shows a section along the line I-I

of figure la.

  FIGS. 2a, 2b, 2c, 2d, 2e show the sequencing of the injection and closure process according to

the invention.

  Referring to Figure la, there can be seen an injector 1 comprising a body 11 preferably made of a molded plastic material of polyethylene or polyamide type. The outer part of the body 11 comprises, in a manner known per se for this kind of parts, annular protrusions 12 ensuring a good anchoring of the device in the wood. Referring also to FIG. 1b, it can be seen that, inwardly, the injector 1 comprises a cylindrical channel 13 comprising, protruding from its inner wall 19, without limitation, four vertical bars 14 arranged under a valve 15 and a constriction 13 , of diameter smaller than that of the valve 15 at its central part, preventing preventing said valve 15 from escaping through the lower end of the channel 13 of the injector 1 and the constriction 13 'preventing said valve 15 s' escape

  by the upper end of the channel 13.

  The valve 15, cone-shaped, is extended at its upper part, directed towards the center of the circular mouth 100 of the injector 1, a tail 16 slightly rounded at its free end, the base of the valve 15 being secured by its edges, slightly above the bars 14, to the inner wall 19 of the body 11 by attachment points 17 for centering the tail 16 to be gripped by the end of the head of a

injection gun.

  With reference to FIG. 2a, it can be seen that the end of an injection gun 2 is provided with an injection head 2 ', ready to be introduced into an injector 1, comprising a hollow cylindrical body 21 inside which is incorporated a gripping means 22 comprising a cavity 24 of cylindrical shape for gripping the tail - 16 of the valve 15, and a passage 23 for the treatment product, formed between the gripping means 22 and the

  inner wall of the cylindrical body 21.

  In FIG. 2b, it can be seen that 1 head 2 'of the injection pistol 2 is introduced into the cylindrical cavity 18 of the injector 1 through the mouth 100 and that the gripping means 22 of the injection head 2' enclose the

  tail 16 of the valve 15 by the wall 240 of its cavity 24.

  In FIG. 2c it can be seen that the valve 15 is no longer secured by the attachment points 17 to the inner wall 19 of the body 11, the attachment points 17 having been broken down by exerting a downward pressure on the valve 15 via the injection gun 2 until the base of the valve 15 abuts against the upper face of the vertical bars 14 of the injector 1, the injection head 2 'also arriving in

stop because of its conicity.

  In FIG. 2d, it can be seen that during the withdrawal of the injection head 22 'from the injector 1 the valve 15, integral with the gripping means 22, is locked in the constriction 13' of the injector 1 and disengaging from the gripping means 22 which allows to completely close the channel formed by the cavity 13 of

  the injector 1, the tail 16 is again centered.

  FIG. 2c shows the injector device at the end of the injection operation, after closure of the channel 20 by the valve 15, the tail 16 being again

  centered for its grip for a new injection.

Claims (4)

  1) Method of sealing an injector (1), after injection of a product for the treatment of wood with the aid of an injector nozzle (2) in a channel (13) passing axially through said injector (1) , characterized in that it consists in operating a valve (15) in channel (13) of the injector (1), with the aid of a gripping means (22) integral with the head (2 ') of the injector gun (2), to close the channel (13) after the injection of the treatment product during removal of the head (2 ') of said gun injector (2).   2) Device for carrying out the method according to claim 1, characterized in that the injector (1) comprises in its channel (13) a valve (15) of substantially conical shape extended by a shank (16), directed towards the mouth (100) of said injector (1), able to be grasped by the gripping means (22) of the injector gun (2) and in that the head (2 ') of the injector gun (2) comprises on the one hand a hollow cylindrical body (21) inside which is incorporated the gripping means (22) and on the other hand a passage (23) for the treatment product formed between said gripping means (22) and the   inner wall of the cylindrical body (21).   3) Device according to claim 2 characterized in that the tail (16) is secured to the wall (19) of the channel (13) of the injector (1) by securing means (17) for centering the tail (16) for gripping by the gripping means (2 ') of the pistol injector (2).   4) Device according to any one of the claims   characterized in that bars (14) are vertically connected under the valve (15) to the wall (19) of the channel (11) of the injector (1) and in that the channel (13) has a narrowing ( 13 '), of smaller diameter than that of the valve (15) at its central part, the bars (14) preventing said valve (15) from escaping through the lower end of the channel (13) of the injector ( 1) and the constriction (13 ') preventing said valve (15) from   escape through the upper end of the channel (13).   ) Device according to any one of the claims   2,3 or 4 characterized in that the gripping means (22) of the tail (16) comprises a cavity (24) of shape   cylindrical for gripping said tail (16).