FR2560454A1 - POWER SUPPLY BAR PROTECTED FROM THE EFFECTS OF GRISOU - Google Patents

Abstract

THE INVENTION RELATES TO A CURRENT SUPPLY BAR. THE BAR IS SHAPED BY RIGID CHANNEL TRUNKS OF CROSS-SECTION IN RECTANGULAR SUBSTANCE WHICH ARE CONNECTED BY ELASTIC DEVICES ENSURING WATERPROOFING, ARE ARTICULATED, ARE SUPPLIED WITH PROTECTIVE GAS AND HAVE A LONGITUDINAL SLOT 2, BASED, DIRECTED TOWARDS THE 'TIGHTNESS IS ENSURED, ARE EQUIPPED IN THE SLOT AREA WITH GUIDING TRACKS FOR A TROLLEY-TYPE TAKING CART ATTACKING CONTACT LINES 9 INSIDE THE TRUNKS AND GUIDED BY AN ARM PASSING THROUGH THE SLOT . THE SEALING DEVICE 4 INCLUDES A BRACKET ELEMENT 5 WHICH COVERS THE JUNCTION POINTS OF TWO JOINING TRUNKS, BUT WHICH IS PROVIDED MOBILE IN RELATION TO THEM, AND A SEALING TAPE 18, PRESSED BY THE ELEMENT IN CALIPER AGAINST THE EXTERNAL FACE OF THE TRUNKS. A WATERPROOFING 14, WITH LIPS 14A, 14A, 14B, 14B AND WITH BOLTS 15, 15 IS MOUNTED IN THE SLOT. THE CURRENT BAR IS READY TO BE USED IN MINES.

Description

Current supply bar sheltered from the effects of firedamp

  The invention relates to a current supply bar sheltered from the effects of firedamp which is formed by a series of rigid channel sections having a cross-sectional profile of

  substantially rectangular in shape, which are connected at their ends

  moths by elastic devices intended to seal, are connected to each other in an articulated manner and are supplied with protective gas, have a longitudinal slit directed downwards, the sealing of which is ensured, and are provided, in the area of this longitudinal slot, with guide tracks for a trolley type socket outlet which attacks electrical contact lines inside the channel sections and which is guided by a socket outlet arm. current passing through the slot

  longitudinal and directed outwards.

  There are already such current supply bars (which are known by German patent applications published before examination under the numbers DE-OS 25 22 319, DE-OS 25 22 320 and DE-OS

  25 22 321). Current supply bars of this kind are intended for

  born from the supply of energy to machines that operate in mines exposed to firedamp. The problem which arises with regard to such current supply bars

  is that, for transport reasons, when the conditions

  space restrictions are tight, channel sections

  of rectangular cross-section which must form the channel-

  tion can only be provided of relatively short length

  and must then be assembled on site. In such cases, diffi-

  on the one hand, from the point of view of editing and,

  before anything else, because of the need to get a farm

  ture which perfectly seals at the places of assembly.

  However, drawbacks also appear with regard to these known types and types of construction, in that -2 -

  sense that the current supply bar, in the assembled state, is relative-

  rigid and cannot be sufficiently removed from modifications to its mounting position which are, for example

  determined by thermal influences, but also by motions

  rock elements, which can lead to the risk of significant non-sealing points appearing at the junction points,

  as in other places, which will hurt the economy.

  It is for the reasons just explained that he has already

  It has been proposed (which is known from the German patent applications published before examination under the numbers DE-OS 30 09 054 and DE-OS 31 23 221) to form the pipe intended to contain the contact lines of a flexible pipe split elastic, inside which the conductors can be laid. In the case of this embodiment, which must also make it possible to transport the flexible hose in the coiled and unfolded state flat, the difficulties which arise when it is a question of assembling several sections of rigid channel do not manifest themselves. obviously not, but the disadvantage of using a flexible hose is that it cannot happen or, at least, that it cannot be achieved in a simple way, place of the longitudinal slot, the closure ensuring the tightness which is necessary to ensure security against

  effects of firedamp and the tightness of the system thus produced.

  Other known means (which have been proposed previously by the German patent application published before examination under the number DE-OS 32 08 734) to resolve this question of sealing and the inherent question of friction which arises in the arm of socket, by the fact that there are no prior elasticity tensions or that there are only low voltages of this kind at the sealing device, are also accompanied by the drawback that the socket outlet must be provided with special guide elements, which bring out a sealing profile, -3 - to be provided distinctly in this place, from the sealing slot during passage, which pass closely over the length of the receptacle and which are placed at the rear of the receptacle in the sealing slot. A system provided according to this embodiment is subject to faults and

is of high cost.

  The object of the present invention is to provide a current supply bar of the type indicated in the preamble to this specification consisting of rigid channel sections which is designed in an embodiment such that it can be easily and easily mounted. sure, that it can meet the requisite condition of a certain mobility and that it guarantees the watertightness

of the system.

  The principle of the present invention resides in that the sealing device consists of a U-shaped stirrup element which covers the junction points of two joining sections of channel, but which is provided mebile with respect to those and a strip of packing which is pressed by the U-shaped stirrup element against the external face of the channel sections.

  The embodiment which is thus proposed by the present invention

  The advantage of this is that it allows very simple mounting, for the reason that it is sufficient, for this mounting, to pass around the junction point a strip of sealing gasket which is adapted to the external dimensions of the parts end of the joining sections of the channel to be joined and tightly press this strip of sealing gasket in place using a U-shaped stirrup element. It is also advantageous for the strip

  packing is made of a material that has elasticity

  city of rubber and that it is pierced with openings intended to allow fixing, by adaptation of shapes, to projections -4 - which are provided with the channel sections and the U-shaped stirrup element, for the reason that, in this way, the exact position of the sealing strip will be amply ensured and

  will be independent of mounting efforts. According to a form of exe

  cution particularly simple, the U-shaped stirrup element can be formed of two stirrup halves which can be assembled to each other along a longitudinal median plane, which will facilitate

mounting.

  According to a particularly advantageous and important characteristic of the system which is the subject of the present invention, provision is made for the dimensions of the U-shaped stirrup element to be chosen, relative to the dimensions of the channel sections, such that there is a peripheral receiving space between these elements which corresponds to the thickness of the strip

  of packing, for the installation of this strip.

  So that the desired dimension of this reception space is ensured, it is also advantageous to provide elements for maintaining distance between the U-shaped stirrup element and the ends of the channel sections. This particular feature has the advantage that the peripheral seal strip will not be crushed at any point, that is to say compressed more than it is desired, so that it will not be subjected that at a low but sufficient preliminary tension, that it will thus guarantee the tightness

  necessary, but that it will not be exposed to the risk of being

  fatally damaged at a particularly stressed point, under the effect of displacements which can occur between the joining sections of channel, which could lead to the appearance of vanishing points. In this respect, it is also essential that the channel sections and the U-shaped stirrup element have rounded edges at the longitudinal edges, so that the packing strip is not at any point exposed to being damaged. due to the presence of protruding edges. The radii -5- of the rounded sections of the channel sections and of the U-shaped stirrup element may moreover have different centers, the centers of the radii of the rounded portions of the U-shaped stirrup element being thus closer together. towards the interior of the space delimited by the pipe that the centers of the radii of the rounded sections

channel.

  This particular feature of realization, on the one hand, simplifies the assembly, for the reason that, during the installation of the element in stirrup, the displacement of the strip of sealing gasket is largely

  excluded. On the other hand, thanks to this particularity of realization also-

  ment, it is obtained, at each of the longitudinal, rounded edges,

  channel sections, some compression of the sealant material

  elasticity, relatively high compression, which can be assessed in advance, which has the advantage that the closure

  sealing at the longitudinal edges, places where

  usually feels the risk of

  t No leaks, is sufficiently satisfactory ensured.

  So that, on the one hand - as already mentioned above -

  the different channel sections remain mobile with respect to each other to a certain extent, but that it is, on the other hand, certain that this relative mobility of the channel sections with respect to each other can in no way harm their tight junction, it is also proposed, according to a particular embodiment of the current supply bar which is the subject of the present invention, that the channel sections which join are connected l to each other

  by connecting elements playing a role similar to that of arti-

  culations which allow many angular deviations in two

  axial directions, but which do not allow these angular deviations

  only to a limited extent. This is obtained by the fact that there are provided, as connecting elements, locking devices - 6 provided on both sides of the U-shaped stirrup element, locking devices which, by adapting shapes , take from the rear the edges of the end faces of the sections

  channel, in such a way that these channel sections can fall

  place one in relation to the other. The locking device, which is advantageously provided in the form of a double locking, can, on the one hand, be provided along its axis with a distance holding element of the kind which has been indicated above, holding element at a distance which has been passed through one of the openings in which the seal strip is pierced and which is in the form of a collar and retains a flange or collar extending towards the two sides which is pierced with openings formed on the other side of the neck, in which engage with play stops being in the form of bolts, which, for their part, are firmly fixed to the ends of the channel sections. These stops in the form of bolts and the flange or collar thus serve as limit stops which limit the mobility of the channel sections relative to each other. However, they do not hinder this mobility of the channel sections. The movement game can be provided from

  so that in no case can it interfere with the closure

  rant sealing. The above-mentioned judgments may

  also play the role of elements that limit the distance

  between the channel sections and the U-shaped stirrup element. To seal the channel sections together, a lip sealing device is provided in the area of the longitudinal slot. has directed sealing lips

  both inward and outward. This profiled element of

  lip tightness is advantageously maintained by adapting shapes in grooves which the canai sections present, grooves which can be formed, in a simple manner, by the provision of bent wings or retaining bars which are firmly fixed - 7 to the sections channel in the area of the longitudinal slot. These wings or these retaining bars, if they are provided on the internal face of the channel sections, can at the same time constitute the tracks

  guide for the trolley type socket outlet trolley.

  They also play the role of reinforcing members at the free end of the channel sections and they thereby prevent stresses from being transmitted from the rigid channel sections to the device ensuring the watertight closure; the

  friction that occurs between the power outlet arm of the cha-

  triot type socket outlet and the lip seal is therefore exclusively a function of the force

  sealing lip application pressure, which can be determined

  properly mined. So that the assembly is simple to make, it is finally provided, according to yet another particular feature of making the current supply bar which is the subject of the present invention, that the channel sections themselves are formed of two halves which will be mounted symmetrically with respect to a common longitudinal median plane, halves which will be kept assembled on a U-profile rail provided inside 23 sections of cana, rail which can serve at the same time as a guide element the rear for the trolley-type socket outlet trolley, so that it will be guided in three points and can therefore be safely moved in the bar

  current supply which is the object of the present invention.

  a more detailed description will be given below

  of the current supply bar which is the subject of the present invention by explaining an exemplary embodiment thereof which is illustrated by the drawings appended to this memo. In these drawings, FIG. 1 represents - in a schematic side view, a section of canial p-uvant be used for mounting the feed bar fe current.ui is the subject of the present invention, section of c- anal which can be seen, provided on one side, a connection point to another section of channel, which is not shown in the drawing, and which one can also see an end closure member; 2 shows, in a schematic sectional view along line 11-II which is shown in Figure 1, the section of channel that can be seen in this figure; Figure 3 shows, in a sectional view along line 111-III which is shown in Figure 1, on a scale greatly enlarged from that of the previous figures, the connection point that can be seen in Figure 1 ; Figure 4 shows, in a partial sectional view along the line IV-IV which is indicated in Figure 3, the connection point that can be seen in this figure; FIG. 5 represents the section of channel that can be seen in FIG. 1, by a sectional view on a scale also greatly enlarged compared to that of the other figures, a view which corresponds to the sectional view along line II- II indicated in FIG. 1, but in which there is also shown a current-taking trolley of the trolley type which is guided inside the channel section; Figure 6 is a partly sectional view showing a part

  end which is provided to form the closure ensuring the watertight

  cheeness of an end face of a channel section; Figure 7 shows, in a plan view, partially broken away, the closure plate which is part of the end piece that can be seen in Figure 6, and Figure 8 shows, in a plan view , the strip of flat packing intended to be used at all the points of connection between sections of channel, such as it is in the unrolled state,

that is to say flat.

  In Figure 1 and in Figure 2 of the accompanying drawings, there is shown

  felt a section of canai I for a current supply bar sheltered from firedamp which has a substantially rectangular cross-section profile, which is opened by a longitudinal slot 2, -9 directed downwards, which is closed by tightly in a manner which will be indicated in greater detail in the following

  this presentation with reference to Figure 5 of the accompanying drawings.

  The channel section 1, which is rigid, is held by collars 3, in the shape of a U, taking it externally from above, and it is fixed using these collars 3, in a manner which is not indicated in detail in the drawings. The necklaces 3 are formed of two

  collar parts 3a and 3b, of bent shape, which are fixed respec-

  by welding to half the and half lb of the channel section 1 and which are rigidly fixed to each other, in their upper part, eri stirrup, using screws or other members similar fixation. ' The channel section 1 which is shown in Figure I of the accompanying drawings is provided at its left end with a sealing device 4, which consists of a U-shaped bracket part 5 - with fixing collar and reinforcement 5a, adjoining it - and a seal, provided below this L: -e ptie en '; rie' en U 5, seal which is not

  shown in Figure 1. The U-shaped stirrup part 5 is not shown

  in the left part of FIG. 1, only up to plane 7, which follows a direction perpendicular to that of the longitudinal axis

  :: U Xonçon of channel I and which represents the median plane of the dispo-

  sif d 'étencicéité 4 forming the connecting part to another section of channel I. At the right end, as shown in Figure 1, the section of channel l is also provided with a part en.rier in U 5 which, however in this case, forms with the gasket, which is not shown in this figure but which Ion can see shown in Figure 3 of the accompanying drawings, a device sealing- 4, by which an end piece 8, q {li is intended for closing the right end side of the channel -i Aronunr 1, is connected in a sealed manner to this section of coach. -i. This -extremitXé 8 piece has been shown distinctly, di fiç: nt more detailed, in Figure 6 and in the figure

  7 of the drawings which are annexed to this memo.

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  Inside the channel section I and in all the other channel sections which are connected to this channel section 1, in leaktight manner, by the sealing devices 4 pass conductor channels.

  electric 9, which will be described further below

  with reference to FIG. 5 of the accompanying drawings, tracks of electrical conductors 9 which are intended for power supply

  electrical machinery or other devices that are mounted outdoors

  laughing at sections of channel 1, for example in exposed spaces

  to grisou, such as mines or other spaces of the same kind.

  1 The power outlet takes place in a way that will be explained in a way

  fully detailed with reference to Figure 5 of the accompanying drawings.

  As can be seen if we refer in particular to the representation of Figure 3 of the accompanying drawings, each of the channel sections I consists of two housing halves 1a and 1b, which are provided under symmetrical shape with respect to a longitudinal median plane 10, which are joined at a point Il along

  this longitudinal median plane 10 and which are screwed or fixed rigid-

  ment in any other way similar to the rigid U-shaped profile bar 12. Still referring to the representation in FIG. 3, it can be seen that the electrical conductors 9 are mounted on respective insulating bases 13 which are specific to them and that the longitudinal slot 2 presented by the rectangular section profile of the channel section 1 is closed in leaktightness by a double lip seal 14, which is provided with two internal lips 14a and 14a 'and two external lips 14b and 14b ', which seal the overpressure inside the channel section I and prevent inadvertent contact of current conducting elements

in the internal chamber.

  The free ends of the two external lips 14a and 14a 'apply

  quent to each other at the longitudinal median plane iO, as well as the free ends of the two outer lips i4b and

- he -

  14b 'apply to each other at the same longitudinal median plane 10. The two profiled sealing parts of the lining

  sealing lips 14, which appear as the enantio-

  each other, are each provided with a split bead; these split beads, which are respectively designated by the reference number 15 and by the reference number 15 ', have been slid by adaptation of shapes on the free ends, facing the longitudinal slot 2, of the two housing halves la and lb , and they are held in these places in a groove which is formed - see also FIG. 5 of the attached drawings - by a wing or retaining bar 16 which is attached to the internal face of each of the halves 1a and 1b of the shoemaker and is rigidly connected thereto, wing or retaining bar 16 which is bent and which, by its elbow branch 16a, directed inwards, at the same time forms a guide face for the socket-outlet carriage of the like a trolley,

  whose description will be given in more detail

  in the rest of this presentation with reference to FIG. 5 of the attached drawings. On the outer side of each of the housing halves 1a and 1b, there is attached, to each of the edges of the longitudinal slot 2, another profiled retaining element, the profiled retaining element 17, which, by a folded end, s 'engages from the bottom into a slot that has the corresponding bead 15 or 15' and which in this way ensures maintenance, by adaptation of shapes, of the corresponding profiled sealing element on the channel section 1, the two elements d sealing sections 15 and 151 thus being maintained

  by adapting shapes on the channel section 1. According to the representation

  As shown in FIG. 3 of the accompanying drawings, an end edge of the U-shaped stirrup 2 which is bent inwards ensures, on the one hand and

  on the other, this engagement by adaptation of forms and the effect of rete-

  bare strips 15 and 15 'of the lip seal

  14. in the area of the sealing device 4.

  Referring to the representations of FIG. 3, of FIG. 4 and of FIG. 8 of the attached drawings, it can be seen that the question of the tight junction of the rigid channel sections relative to one another to the other is resolved, in the case of the embodiment which is illustrated by the drawings, by the fact that the trim

  sealing, relatively thick, which is formed of a strip of

  tightness designated by the reference number 18, is posed for-

  turn of the two channel sections 1 which join and that this seal 18 is tightly pressed by the U-shaped caliper element 5 against these channel sections I or, rather, against the end parts of these sections of channel. In addition, as these representations of Figures 3, 4 and 8 also indicate, the packing 18, which is made of a foam rubber-like material, is not pressed as firmly as possible against the ends whose watertight junction is to be ensured. On the contrary, it is provided that between the external face of the wall of the channel section and the internal face of the wall of the U-shaped stirrup element 5 which externally surrounds the channel section, an annular interval rotating is formed at roughly uniformly, in which the seal 18 is held without heavy crushing stress. This is obtained by the fact that, at the section of channel 1, at the upper part of the latter and at its two lateral faces, there are added distance holding elements 19, which determine

  limiting the deformation of the seal 18.

  The distance holding elements 19 which are provided on the upper face of the channel section 1 are in this case constituted by

  washer-head bolts which, by a peripheral collar

  risk 21, of relatively large diameter, maintain flanges

  or approximately rectangular shaped necklaces 22, which can

  move relative to the heads of the distance holding elements 19. The distance holding bolts thus provided are

  tightened firmly using nuts 23 against the channel sections 1.

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  Also at the side walls, such distance-holding bolts are provided, but, in the case of these, the collars 24, of diameter

  relatively large too, with which 20 heads are applied

  quent to the internal face of the wall of the U-shaped bracket element 5 and, in this way, ensures, on the one hand, the maintenance of the distance, designated by a, between the U-shaped bracket element 5 and the stretch of

  channel 1, but, on the other hand, as the representation clearly shows

  tion of Figure 4, maintain flanges or collars 25, which are held by buttonholes 26 on the distance holding parts 20 and 24, so that it can however move in the direction of the axis 6 (see Figure 1 ) of the channel section 1. As can be seen by referring to the representations of FIG. 3 and of FIG. 4 of the appended drawings, these flanges or collars 25 are supported, so as to be able to pivot, on a cylindrical part 27 of a rotatable bolt 28, which is held tight by means of a rubber or synthetic disc or washer 29 and a metal disc or washer 30, as well as by a nut 31, which is ensured in the position taken by rotation to the external face of the wall of the U-shaped bracket element by friction forces and which, on the internal face of the channel sections 1 and 1 ', which meet in this end-to-end case, forms a double lock 32, which, when tightening the bolt 28, is entrained é in rotation with it and, as shown in the representation of Figure 4, is placed behind the corresponding end edges lc and lc 'of the channel sections 1 and 1' which meet. The collar or flange 25 is maintained on

  ia the cylindrical part 27 of the bolt 28 using a pin 33. One can also realize, if one refers to the representation

  tion of Figure 3 of the accompanying drawings, that the channel section has, at its four longitudinal edges, rounded 35 and at the edges of the U-shaped stirrup element 5 - which correspond to the longitudinal edges question of the section of canal I, rounding is also planned, which are designated by the number of - 14-

  reference 34. The center Ml of the radius RI of the rounding 35 does not

  does not coincide with the center M2 of the radius R2 of the rounding 34; the center M2 of the radius R2 of the round 34 is situated on the contrary at a point closer to the middle of the space delimited inside the channel section I than the center M1 of the radius RI of the round 35, and , else

  part, also in the plan which, in the case of the example of reali-

  sation considered here, is at an angle of 45 from each of the side walls of the channel section 1 and in which is the bisector of the right angle formed by these side walls. In this way, there exists, between the rounding 34 of the edges of the U-shaped stirrup element 5 and the rounding 35 of the longitudinal edges of the channel section 1, a spacing distance b which is less than the distance a that elements 5 and I delimit between

  their walls which are parallel to each other. The trim strip

  Ture sealing 18, which is shown in the flat state, that is to say, unwound, by a plan view, from above, in Figure 8 of the attached drawings, is therefore, when it has been laid around the section of channel 1, a little more compressed in the places where are located

  rounding 34 and 35 than in other places. At the edges, which represents

  feel critical points regarding tightness, there is therefore a higher application pressure than

  other places, which seals.

  As can be seen by referring to the representation

  tion of Figure 8 of the accompanying drawings, the seal strip 18, which is advantageously made of foam rubber, is pierced with several openings, designated by the numbers of

  references 40, 41 and 42, among which the corresponding openings 40

  lay, with regard to their profile, to the contour of the flanges or collars 22 which are held on the upper face of the sections

  channel I by the remote holding elements 19, and the openings

  res 41 are of a size such that it corresponds to the external dimensions of the flanges or collars 25 which are provided laterally

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  in the area of the locking device 32. The openings 42, which are circular holes serve to receive fasteners of the rivet type 43 which are firmly fixed to the channel section I and which must serve to secure, in the area from the longitudinal slot 2, an applied seal strip 18, when the U-shaped stirrup element 5 has not yet

been completely assembled.

  The assembly of the current supply bar which is the subject of OJ the present invention takes place in the manner which is indicated below: When sections of channel 1 must be assembled, they are fixed in a manner suitable for l 'using their suspension collars 3, so that their end faces which meet are îrouvent in alignment with each other. Then, the profiled lip sealing element can be placed between two sections of channel i which meet or between several sections of channel I which join, the beads 15 and 15 'with which this element is provided.

  sealing profile being for this purpose, as indicated in the representation

  Figure 5, pressed into the groove which is formed by the wing or the retaining bar 16. The wings or the retaining bars 17 can then be put in place. The sealing device 4 is then put in place at the transition point, by the fact that on the end portions in alignment with one another of the two channel sections 1 which meet, the sealing strip 1 g which is shown in FIG. 8 of the accompanying drawings, sealing strip 18 which, after the positioning of the distance holding elements 19, 23 and, 23, is maintained , by adapting the shapes, by the flanges or collars 22 and 25 and by the rivet-type fasteners 3 0 43. In the zone where the element in the shape of a U-shaped bracket 5 must be placed, in which it retaining bars 17 have not been placed, the lip sealing device, that is to say the beads 15 and 15 'with which this device is provided, are then still exposed from below. The U-shaped stirrup element 5, which is in three parts, is then put in place, the core part of this U-shaped stirrup element, which is formed by the two parts 5c and 5d, being all d 'first placed on the upper part, at the same time as the upper wall part 5e which is fixed to these two parts 5c and 5d. Then, the wall parts 5f and 5g, which are each separated at the locations of the wall part 5e, with the corresponding collar parts a and 5b, of the collar ends 46 and 47, are fixed to each other. other by screwing, so that the shaped stirrup element

  in U 5 takes its final form. Beforehand, the lower end

  free upper wall parts 5g and 5f is hooked into the cutout in the form of a slot which is provided for this purpose in the beads 15 and 15 ', so that the sealing lips are. also ensured in their position in the area between the retaining bars 17. Finally, the pivoting bolt 28, with the locking device 32, is introduced into the opening which is provided externally for this purpose in the wall part 5f, so that the locking device 32 engages in the interval 48 which is formed at the free ends of the channel sections I and 1 ′, the interval by which it can only be passed through when it is in a position in which it is offset by 90 relative to the position in which it is shown in Figures 3 and 4 of the accompanying drawings. If we then rotate

  the locking device 32 of 90 using the bolt 28, the posi-

  tion taken by rotation being indicated by the position of the screwdriver slot 50 which is provided externally on the bolt 28,

  this locking device 32 takes the rear edge from the rear

  mite that each of the neighboring channel sections 1 and 1 'has and in this way it ensures the alignment of the end edges of the channel sections with respect to each other, which is also determined by the flange or collar 25 which is provided in the space between elements 5 and 1. The two joining channel sections are then perfectly assembled so that it

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  there is a seal between them. Nevertheless, a certain angular displacement of the channel sections 1 and 1 ′ with respect to each other is possible, the angular movement occurring around the axis of the distance holding elements 20 (in the direction of rotation which is indicated in X in Figure 3 of the accompanying drawings), and this, because the U-shaped stirrup element 5, in its lower area, is adjusted by adapting shapes on the channel section 1 and on the section

  1 'channel, while at the top the head of a cylindrical screw

  that is engaged in a passage that has the upper flange or collar 22. Buttonholes which are provided in the flange or collar 22 limit the movement movement around the axis of rotation X. Compensation around an axis Y which passes by the longitudinal median plane 10 (in the direction of rotation which is indicated by Y in FIG. 3 of the appended drawings) is also possible to a certain extent, and this, due to the fact that the

  distance holding heads 20 which are provided in the lower zone

  side walls are supported with play in the openings

  corresponding tures 26 presented by the flange or collar 25, so that a reciprocal displacement of the end parts

  channel sections 1 and 1 'relative to each other is possible.

  The locking device 32 allows such movement.

  In a current supply bar, the construction and the junction of the elements ensuring the watertight closure are carried out in the manner which has been explained above, moves in a manner known per se a current socket trolley of the trolley 55 type (shown in Figure 5 of the accompanying drawings) which is guided by two rollers

  bearing 56 on the guide tracks 16a formed by the retaining bar

  bare 16 and, at the upper part, by a guide roller, by the lateral edges 57 which the U-shaped rail presents 12. Friction contacts 58 with which the tiolley-type socket-outlet carriage 55 is provided attack the rails. contact 9. Electric power

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  received is conveyed to the outside by a pivoting arm 59, which is provided in the form of a sword and which, during its passage, spreads the sealing lips of the sealing device which comprises

the beads 15 and 15 '.

  Since all the sections of channel I must be supplied with a gas, advantageously inert, which must be under pressure, a tight closure must be provided at one of the ends of one of the sections of channel I. The possibility a pressure connection must also be provided. This is what is mounted - at the right end of the I channel section according to the

  representation of Figure I of the accompanying drawings - the end piece

  mite 8, which is first of all placed so as to seal the end face, in the same way as another part of channel section, with the U-shaped stirrup element 5. The connection neck 60 of the end piece 8 may be provided with a connection for a pressurized connection intended for the passage of the gas which must supply the internal space. To the four outer walls of the neck piece 60 are fixed by welding flanges 62, 63 and 64, in which engage tie rods 65 which are intended for the fixing, ensuring the sealing, of an end plate 66 and between this end plate 66 and the end face of

  the neck portion 60, a rubber seal is provided

  foam choux 67 or a seal at the joint, which is pulled so as to seal against the lip sealing device 14, by the fact that a screw 68, which is provided with counter hooks,

  is pressed at the end into the lip seal 14.

  It would obviously also be possible to permanently fix a sealed closure plate 66 to the neck portion 60. The chosen embodiment however has the advantage that the plate 66 can be removed, this having to allow access to the interior. from the bar

current supply.

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Claims (15)

Claims i. Current supply bar sheltered from the effects of firedamp, which is formed by a series of rigid channel sections having a cross-sectional profile of substantially rectangular shape, which are connected at their ends by devices intended to ensure sealing, are connected to each other in an articulated manner and are supplied with protective gas, have a longitudinal slot directed downwards, the sealing of which is ensured, and are provided, in the area of this longitudinal slot, of guide tracks for a trolley type socket outlet cart which attacks electrical conta't lines inside the channel sections and which is guided by a socket outlet arm passing through the slot longitudinal and directed outwards, the current busbar being characterized in that the sealing device (4) consists of a U-shaped stirrup element (5) which covers the points of junction of deu. t-channel grooves {(1 1 ') meeting, but which is provided movable relative to them, and a strip of sealing gasket ({(g) which is pressed by the element in stirrup of iorme in U against the external face of the sections of channel (1,9 i '). Current control range sheltered from the effects of firedamp according to claim 1: characterized in that the trim strip of e-t: ch. ity (18) es-it: aite of a material which has the elasticity of rubber and in that it is pierced with openings (40, 41, 42) intended to allow fixing, by adaptation of shapes, to projections b22, 25, 43) which are provided with the channel sections (1, l) and I'élémen n éterier de fori-me in U (5). 3, Ba.re of current supply sheltered from the effects of firedamp according to claims 1 and 2, characterized in that the caliper element of ftorn in Ul {5 is formed by three parts of caliper (Sa , 5b and c) can be assembled Pune to another. - 20 -   4. Current supply bar sheltered from the effects of the following firedamp   claims 1 to 3, characterized in that the dimensions   of the U-shaped stirrup element (5) are chosen, with respect to the dimensions of the channel sections (1, 1 '), so that it   there is a peripheral reception space which corresponds to the thick-   seal (a) of the seal strip (18).   5. Current supply bar sheltered from the effects of firedamp according to claim 4, characterized in that there are provided elements 0 for maintaining distance (19, 20) between the element in stirrup shape   U-shaped (5) and the ends of the channel sections (1, 1 ').   6. Current supply bar sheltered from the effects of the following firedamp   Claims 4 and 5, characterized in that the sections of   channel (1, l ') and the U-shaped stirrup element (5) have   rounded (34, 35) at the longitudinal edges.   7. Current supply bar sheltered from the effects of firedamp according to claim 6, characterized in that the radii (R1, R2) of the rounding (34, 35) of the channel sections (1, 1 ') and of the U-shaped stirrup element (5) have different centers (Ml, M2) and that the centers (M1) of the radii of the rounds (34) of the U-shaped stirrup element (5) are closest inward demarcated space.   8. Current supply bar sheltered from the effects of firedamp according to claim 1, characterized in that the U-shaped stirrup element (5) is connected to the two ends of the channel sections (1, l ') which are joined, by connecting elements playing a role   similar to that of joints (28, 32).   9. Current supply bar sheltered from the effects of the following firedamp   claim 8, characterized in that it is provided as an element - 21 -   connecting elements, locking devices (32) provided on both sides of the U-shaped stirrup element (5), locking devices which, by adaptation of shapes, take from the rear   the edges of the end faces (lc, Ic ') of the channel sections (1, 1').   10. Current supply bar sheltered from the effects of the following firedamp   Claim 9, characterized in that the locking devices   ge (32) are the two arms of a double locking device   which is mounted in the middle, so that it can turn, on the element in U-shaped stirrup (5).   11. Current supply bar sheltered from the effects of firedamp according to claim 10, characterized in that the axis (51) of the device   double locking device is provided with a neck (27) of relative diameter-   large, as a distance-keeping element, and in that it is guided by one of the openings (41) that the strip of seal (18).   12. Current supply bar sheltered from the effects of the following firedamp   claim 11, characterized in that on the neck (27) is main-   held a flange or collar (25) which extends on both sides, flange or collar which is pierced with openings (26) located on either side of the neck (27), and in that in these openings s '' engage with set of stops (20) in the form of bolts, which are fixed   closing at the ends of the channel sections (1, 1 ').   13. Current supply bar sheltered from the effects of the following firedamp   claim 12, characterized in that the stops (20) are pre-   feeling in the form of bolts are provided as hand elements-   tiern distance between the U-shaped stirrup element (5) and the channel sections (t, 1 '). - 22 -   14. Current supply bar sheltered from the effects of firedamp, according to   any one of claims 1 to 13, characterized in that   the U-shaped stirrup element (5) is engaged by adaptation   of shapes, by its free ends, with a profiled element of   continuous lip seal (15, 15 ') which ensures the tight closure of the longitudinal slot (2) which the channel sections have (1, 1 ').   15. Current supply bar sheltered from the effects of the following firedamp   claim 14, characterized in that the profiled element of   lip seal (15, 15 ') is maintained by adapting shapes   in grooves presented by the channel sections (1, 1 ').   16. Current supply bar sheltered from the effects of firedamp according to claim 15, characterized in that the grooves are formed by wings or bent retaining bars (16, 17) which are fixed firmly to the sections of channel (1, 1 ') in the area of the longitudinal slot (2).   17. Current supply bar sheltered from the effects of firedamp according to claim 16, characterized in that the upper faces (16a) of the wings or retaining bars (16) constitute guide tracks for the carriage. socket outlet of the trolley type (55).   18. Current supply bar according to claim 1, character-   in that the channel sections (1, 1 ') are formed by two halves (la, lb) which are mounted symmetrically with respect to   a common longitudinal median plane (10), halves which are now   bare assembled on a U-shaped rail (12) provided inside canal sections.