FR2783577A1 - LOW LENGTH TWO-DRAWER DISPENSER - Google Patents

Abstract

It is sought to provide a distributor (10) which is of a particularly compact and simple construction, and allows control operations free of overlaps. To this end, the dispenser (10) according to the invention comprises a drawer arrangement consisting of two dispenser drawers (48, 49) arranged parallel to each other, guided in drawer bores (22, 24) separate, and can be operated jointly and in the same direction. Each distributor drawer (48, 49) is associated with one of the working connections (36, 38) of the distributor (10). It is possible to produce distributors (10) with four or five pressure fluid connections and two or three control positions of the distributor drawers (48, 49).

Description

The invention relates to a dispenser, in particular intended to order

  double-acting receivers, and comprising a casing in which a drawer arrangement, which can be moved between at least two control positions, controls the pressure fluid connections between two working connections and a supply channel and respectively at least one return channel. Such a dispenser is already known, for example from the document DE 19 509 578 A1. This known dispenser is equipped with a dispenser drawer which is movably guided in a drawer bore. The distributor slide is of a relatively slender configuration, and has on its periphery, several piston rod sections spaced axially from each other. These piston sections control pressure fluid connections between pressure fluid chambers, which are provided in the distributor housing. The pressure fluid chambers are connected, via fittings, to external pressure fluid sources, tanks or receivers. In the present case, it is a 5/2 type distributor, with five ports and two positions, comprising five connections and two possible control positions for the

dispenser drawer.

  The disadvantage of this 5/2 type distributor, with five orifices and two positions, lies in the fact that it has a relatively large overall dimensions and that its casing must be machined in a relatively complex manner in order to allow guiding the dispenser drawer with as little friction as possible. In addition, the implementation for its assembly is relatively important, because of the large number

the rooms.

  The object of the invention essentially consists in reducing the overall length of such a

  distributor, as well as its machining.

  In accordance with the invention, this object is achieved for a dispenser of the type mentioned in the introduction, by the fact that the drawer arrangement comprises two dispenser drawers arranged in two separate drawer bores, which are each associated respectively with the 'one of the working fittings, and that the distributor drawers are arranged in the housing parallel to each other, and can be biased in the same direction by means of an actuating device. According to an advantageous configuration of the invention, the actuation device comprises a pair of piston and cylinder units opposite and actuated by a pressure fluid, which stress

  the two dispenser drawers in common.

  Furthermore, the housing consists of two housing parts coupled to one another by means of fixing elements, and the joint plane between the housing parts extends transversely to the bores.

drawer.

  According to an advantageous characteristic of the invention, the pressure fluid channels leading to the working fittings and the supply channel and respectively the return channel open into the drawer bores at an angle at least

substantially straight.

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  According to an advantageous configuration of the invention, each housing part has one of the working connections and the supply channel or the return channel. According to another characteristic, at least one of the fastening elements connecting together the housing parts, passes through one of the pressure fluid channels

leading to the working fittings.

  According to the invention, the distributor can be a pneumatic distributor of the 4/2 type, with

four holes and two positions.

  According to another characteristic of the invention, the supply channel and the return channel open into the drawer bores, between the two working fittings, considering the direction

dispenser drawers.

  Advantageously, the two casing parts can be manufactured so as to be ready for assembly, by an injection molding technique,

  and are made of plastic.

  Also, a dispenser according to the invention has the advantage of being of a compact and simple construction, and of having good flow values. The distributor is made up of few parts, which are of an assembly posing no problem, and are of an economic manufacture. The construction method according to the invention allows an execution without overlapping of the dispenser, and is particularly well resistant to pressure, due to a majority of pressure-conducting channels, of round shape. It is possible to produce distributor variants with two or three control positions,

for each four connections.

  Other advantages or advantageous developments of the invention will appear in the

  following description of an exemplary embodiment, which will

  be explained in more detail below and which is shown in the accompanying drawing, the single figure shows a dispenser according to the invention, in longitudinal section. The distributor 10 shown in the figure has a block-shaped casing 12, made up of two casing parts 14, 16. The two casing parts 14, 16 bear one on the other along a plane seal 17, and are screwed together. To this end, the first part of the casing 14 has housing 18 through holes, intended for screws not shown; the second housing part 16 is provided with tapped, blind holes 20. In each of the housing parts 14, 16 are formed, perpendicular to the joint plane 17, two drawer bores 22, 24 parallel to each other. These drawer bores 22, 24 are open in the direction of the joint plane 17, are mutually aligned in the assembled state of the casing 12, and are separated from one another by a common intermediate wall 26. At their distant ends from the joint plane 17, the drawer bores 22, 24 have a single recess at a right angle, and then emerge, in the direction of the outer surfaces of the housing 12, each in a respective common recess 28, 29. The recesses 28, 29 are opposite each other is are closed each towards

  the outside, by means of a closing plate 30.

  Each housing part 14, 16 is moreover provided with a pressure fluid channel 32, 34 extending parallel to the joint plane 17. These pressure fluid channels 32, 34 pass through the two drawer bores 22, 24 , and terminate blindly inside the casing 12. At the opposite end, the pressure fluid channels 32, 34 open into working connections 36, 38 of the distributor 10, produced as push-in connections . The working connections 36, 38 can be connected by means of pipes, not shown, to

pressure fluid receptors.

  A supply and evacuation of pressure fluid from the distributor 10 is carried out by means of a supply channel 42 or respectively of a return channel 40, each of one of these two channels being respectively produced in the one of the casing parts 14, 16. In the assembled state of the casing 12, the supply channel 42 and respectively the return channel 40 open, between the two fluid channels

  pressure 32, 34, in the drawer bores 22, 24.

  In the exemplary embodiment, the feed channel 42 and the return channel 40 extend perpendicular to the plane of the drawing, so that only their mouth sections are visible in the drawer bores 22, 24. The fittings of the supply channel 42 and respectively of the return channel, and the working connections 36, 38 of the distributor 10 are therefore arranged on external, neighboring sides, of the

housing 12.

  The arrangement described of the channels therefore assumes that the housing bore 18 in the first housing part 14 crosses the pressure fluid channel 32 which is produced there. A loss of pressure in this pressure fluid channel 32 is prevented due to the fixing screw to be inserted in this housing bore 18, and bearing in a sealed manner, with its head

screw, on the housing part 14.

  Before the assembly of the two housing parts 14, 16, the rings 44 are forcibly mounted in each of the drawer bores 22, 24, in the region of the end, situated inside, of the intermediate wall 26 These rings 44 are thus each located between one of the working connections 36, 38 and the supply channel 42 and respectively the return channel 40 of the distributor, and thus divide its interior space into several pressure chambers 45. controlling pressure fluid connections between these individual pressure chambers 45, two distributor drawers 48, 49 are provided, arranged axially movably in the drawer bores 22, 24. As regards the two distributor drawers 48, 49, these are cylindrical elements, the outside diameter of which is adapted to the inside diameter of the rings 44. The dispenser drawers 48, 49 are provided with peripheral seals 46, and each with two narrowing 47 arranged so as to be axially spaced from each other at respectively different distances. The seals 46 and the constrictions 47, by interaction with the interior surfaces of the rings 44 and as a function of the axial position of the distributor drawers 48, 49 in their drawer bores 22, 24, release pressure fluid connections between the individual pressure chambers 45, or close them in a pressure-tight manner. An actuation of the dispenser drawers 48, 49 is carried out by means of pistons 50, 51 which are slidably guided in the recesses 28, 29 opposite. These pistons 50, 51 have for example, an active pressure surface 50a, 51a of circular shape and each two opposite guide sections 50b, 51b, arranged perpendicular to the active pressure surface 50a, 51a. The pistons 50, 51 are fitted, at their active pressure surfaces 50a, 51a, with seals 52, so that cylinders 53 are formed between the closure plates 30 and the pistons 50, 51, 54, which can be supplied with pressure fluid, in a manner not shown. The pistons 50, 51 can be actuated, by means of the pressure level in the cylinders 53, 54, against the force of a compression spring 55, which is arranged in one of these cylinders 53, 54 and which rests on the one hand on the inner side of the closure plate 30 and on the other hand on the active pressure surface 50a, 51a of one of the pistons, 51. The guide sections 50b, 51b of the pistons 50, 51, directed towards the inside of the casing 12, bear with their front faces on those of the distributor drawers 48, 49. A piston movement is therefore directly transmitted to the two distributor drawers 48, 49, so that these move parallel and in the same direction, from their rest positions to their control positions and vice versa. In the figure, the distributor 10 is shown in a control position, in which the piston 51 of the housing part 16 is in its extreme external position. In this control position, the cylinder 53 of the opposite piston 50 is free of pressure, and the compression spring 55 is compressed to the maximum. The dispenser drawers 48, 49 are here in a position, in which the

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  return channel 40 is in communication, via pressure fluid channel 32, with first working fitting 36, while feed channel 42 is in communication, through pressure fluid channel 34, with the second working fitting 38. A pressure supply from the cylinder 53 of the piston 50, in combination with a pressure discharge from the opposite cylinder 54, from the piston 51, triggers a control inversion phase, for which the drawers distributor 48, 49 move to a position for which the return connector 40 is connected to the second working connector 38 and the supply connector 42 to the first working connector 36. The working connectors 36, 38 are therefore, at each control movement of the distributor 10, alternately connected to the supply channel 42 and

  respectively to the return channel 40.

  By means of an appropriate dimensioning of the distances between the two constrictions 47 of one of the distributor drawers 48, 49, and respectively by virtue of the relative position of the constrictions 47 on the two distributor drawers 48, 49 relative to the 'other, it is possible to achieve a configuration without overlaps, the distributor 10. This means that during the control reversal phase, there is no pressure fluid connection between the two working fittings 36, 38 In the same way, it is possible, thanks to an appropriate configuration of the distributor drawers 48, 49, to provide a third, neutral control position of the distributor 10, located between the two mentioned control positions, for which a flow pressure fluid is blocked, both from or towards the two working connections 36, 38, as well as from the supply connection 42 or respectively towards the connection

back 40.

  Other modifications or additions concerning the embodiment described, are naturally possible, without departing from the basic principle of the invention. This essentially consists of a configuration of a distributor drawer in two parts 48, 49, in order to allow an execution without overlapping of a distributor 10, and in particular also a low cost and a reduced bulk. This basic principle can be transposed identically to hydraulic and pneumatic distributors. For the actuation of these distributors, it is possible to envisage all the known possibilities, such as for example, electrical, electromagnetic, mechanical, pneumatic or hydraulic actuation devices, actuation controlled by pressure fluid by the pistons 50, 51, which has been described, having been chosen only by way of example. In addition, it should be noted that the distributor is of a particularly economical manufacture, when the casing 12 is made of plastic material, according to an injection molding technique, and it is quite naturally possible to provide distributors 10 that conform to the invention, a greater number of fittings than the four fittings 36, 38,

, 42 described.

Claims (9)

CLAIMS.   1. Distributor (10), in particular intended to control double-acting receivers, and comprising a casing (12) in which a drawer arrangement (48, 49), which can be moved between at least two control positions, control of the connections of pressure fluid between two working connections (36, 38) and a supply channel (42) and respectively at least one return channel (40), characterized in that the drawer arrangement comprises two distributor drawers ( 48, 49) arranged in two separate drawer bores (22, 24), which are each associated respectively with one of the working connections (36, 38), and in that the distributor drawers (48, 49) are arranged in the housing (12) parallel to each other, and can be biased in the same direction at   by means of an actuating device (50, 51).   2. Dispenser according to claim 1, characterized in that the actuating device comprises a pair of piston and cylinder units (50, 51, 53, 54) opposite and actuated by a pressure fluid, which urge the two drawers of distributor (48, 49) in common.   3. Distributor according to one of claims   1 or 2, characterized in that the housing (12) consists of two housing parts (14, 16) coupled to one another by means of fastening elements, and in that the joint plane ( 17) between the housing parts (14, 16) extends transversely to the drawer bores (22, 24). he   4. Distributor according to one of claims   1 to 3, characterized in that the pressure fluid channels (32, 34) leading to the working connections (36, 38) and the supply channel (42) and respectively the return channel (40) open into the drawer bores (22, 24) at an angle to the less noticeably straight.   5. Distributor according to one of claims   1 to 4, characterized in that each casing part (14, 16) has one of the working connections (36, 38) and the supply channel (42) or the return channel (40).   6. Distributor according to one of claims   1 to 5, characterized in that at least one of the fastening elements connecting together the housing parts (14, 16), passes through one of the pressure fluid channels (32,   34) leading to the working connections (36, 38).   7. Distributor according to one of claims   1 to 6, characterized in that the distributor (10) is a pneumatic distributor of the 4/2 type, with four orifices and two positions.   8. Distributor according to one of claims   1 to 7, characterized in that the supply channel (42) and the return channel (40) open into the drawer bores (22, 24), between the two working connections (36, 38) considering the axial direction of dispenser drawers (48, 49).   9. Distributor according to one of claims   1 to 8, characterized in that the two housing parts (14, 16) can be produced in such a way that they are ready for assembly, using a technique of molding by   injection, and are made of plastic.