FR2489925A1 - DEVICE FOR INTERRUPTING THE FLOW OF A CURRENT WITHIN PIPES - Google Patents

Abstract

THE DEVICE IS CONSTITUTED BY A PINCH MECHANISM 10 ACTIVATED IN ANY WAY BUT PREFERREDLY BY COMPRESSED AIR AND WHICH OPERATES UNDER THE INFLUENCE OF A MANUAL CONTROL 25 OR DEPENDENT ON THE MOMENTARY POSITION OF A CONTROL MEANS.

Description

The present invention relates to a device for interrupting

  the flow of a current inside pipes, in particular inside pipes used for sand blasting apparatus and / or in sand blasting installations or for similar devices.

  Devices of this type are known in the form of

  my very diverse achievements. It is generally not difficult to interrupt the flow of current inside conduits or pipes by means of valves and / or drawers in the case of clean liquids which do not contain impurities bulky and attacking surfaces. In this

  However, we are already faced with problems.

  However, significant difficulties arise when transporting sand through pipes by means of compressed air, which is quite usual in sandblasting installations. In these installations,

  in addition, being able to immediately stop the flow of

  sand-air cloth, for example, when the worker holding the

  lance stumbles and loses control of the nozzle.

  The object of the present invention is to create a dis-

  positive - which not only meets safety requirements but also withstands harsh and inherent conditions

  sandblasting.

  The above problems are solved in accordance with the invention because the device consists of a gripping mechanism actuated in any way but of

  preferably by compressed air and which operates under the

  fluence of a manual control or depending on the position

  momentary control means. This form of reaction

  The layout stands out for its astonishing simplicity. Indeed we already know pinching mechanisms for pipes,

  for example, in the medical field but to date

  sonne did not plan to take advantage of the experiences acquired in this medical field in order to use a mechanism of this type for pipes of sand blasting apparatus and this all the less since the pipes of medical apparatus cannot

  not be compared to pipes used for sanitation work

  blage. It is important in the device according to the invention

  tion that this makes it possible to abruptly interrupt the flow

  lement of the current and this in particular thanks to a command

  by compressed air. It is obvious that one can choose other

  very control means, for example a pre-stressed spring, hydraulic or magnetic controls without leaving the frame

  of the invention, especially if the chosen command

  meets the security requirements requested. These requirements of

  are particularly satisfied when the interruption

  The arrival of the air-sand mixture is carried out by a com-

  forced demand, i.e. as a function of a determined movement

  mined by the worker or depending on the position of a control means. According to another characteristic of the invention, the device consists essentially of two jaws

  substantially opposite one another, extending transversely

  dirty to the pipe and at least one of which is controlled to perform a pinch movement. It is then advantageous for one of the jaws to be formed by a fixed bar and rounded on its side opposite the pipe while the other jaw having the same section as the pipe is connected to a crank or to a slide. These embodiments are simple and prevent the pipe from being exaggerated.

  In order to obtain an abrupt clamping of the pipe, the

  vention provides that in the crank embodiment the latter is actuated by a compressed air motor

  comprising a rotary piston with reversible movement, the reverse

  sion being controlled via a three-way valve

tracks.

  In order to give the device a compact and aesthetic appearance and to protect its constituent parts, all the elements of the device, with the exception of the fittings for its control, are arranged in a housing which can be closed by means of a cover and which is crossed by the pipe to be closed, for example the pipe from a pickling installation

  by sand play, and inside which the pipe is hand-

held in its proper position.

  A particularly important feature of

  the invention resides in the fact that the device is controlled

  dice from a hand valve, the control lever of which

  bit the pressure of the worker's hand maneuvering the sandblasting lance, the pinch device being in its opening position as long as the worker's hand

  exerts pressure on the lever, in practice this

  means that the worker operating the blast lance can only work when he pushes the control lever against the hose or tube of the lance because only in

  this position of the control lever the flow of the sand mixture-

  air is released. If, on the other hand, the lever is no longer retained, for example when the worker trips over an obstacle or makes a false movement, the pinching device acts immediately

  and stops the flow of the sand-air mixture.

  In order to be able to take advantage of these benefits,

  In installations, the invention provides that the device

  positive is controlled from a stop valve whose bu-

  tee is located on the path of movement of a door of the

sandblasting booth or the like.

  Various other features of the invention res-

  emerge from the detailed description which follows.

  An embodiment of the object of the invention is shown, by way of nonlimiting example, in the drawing

Annex.

  Fig. 1 is a top view showing diagrammatically

  tick the device according to the invention.

  Fig. 2 is a side elevation of the device

  of fig. 1, the front wall being removed.

  As can be seen from the figures, an intermediate wall

  diary 3 is provided inside a form 1 housing

  rectangular and closed by a cover 2. A 4-pipe

  pours the housing 1 through openings 5, 6 formed in two facing walls. The openings 5, 6 for the passage of the pipe are made so as not to cause deterioration of the pipe. In order for the pipe 4 to maintain its position, guides 8, 9 conforming to this pipe around its periphery

  are provided on the bottom 7 of the bootmaker 1.

  The pinching device 10 according to the invention

  tion consists of a lower jaw 11 in form

  bar of me and whose top is rounded and by a ma-

  upper choir 12 of tubular shape. The jaw 11 is fixed to the bottom 7 of the shoemaker 1 while the jaw

  choire 12 is mounted on one end in a manner

  valve 13, the other end of which is connected to the shaft of a compressed air motor 15 comprising a rotary piston and

  which can be fixed on the bottom 7 of the housing. The jaws

  res 11, 12 Used to compress the tube 4 as shown in fig, 2 and it is obvious that, therefore, the current can no longer flow. The open position

  of device 10 is shown in broken lines 17.

  In order to be able to control the reversal of the direction of rotation of the compressed air motor, the latter is connected by conduits 18, 19 to a three-way valve 20, the

  compressed air supply duct is designated by 21.

  A valve 24, aui is controlled by a lever 25 so that it does not keep the device 10 open to let the current of the sand-air mixture pass in the direction of the arrow 16 as long as the lever 25 is pushed against the pipe 4 is connected to the three-way valve 20 via two pipes 22, 23. FIG. 1 shows that the lever 25 is placed near the spray nozzle 26 so that the worker driving the nozzle 26 can work under perfect safety conditions. It is however also possible to make the control valve in the form of a stop valve yes is

  placed on the path of movement of a Gate of the instal-

  sandblasting stripping lation so that the projection of sand is interrupted during unauthorized opening

Door.

  It appears from the accompanying drawings that the present

  vention creates using very simple means a provision

  sitive which meets the most stringent requirements and which is of universal use because the use of this device is not limited to installation pipes

  of sandblasting because it can be incorporated

  poré in any installation in which

finds similar conditions.

Claims (4)

  1 - Device for interrupting the flow of a current inside pipes, in particular inside pipes used for sand blasting apparatus and / or in blasting sand blasting installations or for   similar devices, characterized in that it is   formed by a gripping mechanism (10) actuated in any way but preferably by compressed air and which operates under the influence of a manual control (25) or by   dependence on the momentary position of a control means.   2 Device according to claim 1, character-   laughed at in that it consists essentially of two   choirs (11, 12) substantially opposite one another, extending transversely to the pipe (4) and of which at least   one (12) is controlled to perform a pin movement cement,   3 - Device according to one of claims 1   and 2, characterized in that one of the jaws (11) is formed   led by a fixed and rounded bar on its opposite side   of the pipe while the other jaw (12) having the same   me section that the pipe is connected to a crank (13) or to a backstage.   4 - Device according to one of claims 1   to 3, characterized in that in the embodiment with ma-   level (13) the latter is powered by a motor   compressed air (15) comprising a rotary piston with internal movement   versible, the reversal being controlled via a three-way valve (20).   - Device according to one of claims 1   to 4, characterized in that all the elements of the device, with the exception of the fittings (22 to 25) for its control, are arranged in a case (1) which can be closed by means of a cover (2) and which is crossed by the pipe to be closed (4), for example the pipe from a sandblasting installation, and inside which the pipe (4) is kept   in its appropriate position (8, 9).   6 - Device according to one of claims 1   to 5, characterized in that it is controlled from a van-   hand-held (24), the control lever (25) of which is under pressure   sion of the worker's hand operating the sandblasting lance (26) ,. the pinching device (10) being in its open position as long as the worker's hand exerts pressure on the lever.   7 Device according to one of claims 1   to 5, characterized in that it is controlled from a stop valve whose stop is located on the path of   moving a door of the sandblasting cabin or the like.