CZ38693A3 - Device for closing holes in walls, particularly inlets for switching stations - Google Patents

Abstract

A device for closing off a wall opening used for access to a switch cubicle embedded in concrete has a frame with soffit plate and a hinged door. The box section frame holds the hinge which has an arm projecting through the frame onto the rear of the door. The door has an opening angle of more than 90 degrees. The frame is made from extruded aluminium. Around its inner walls are shoulders which form location surfaces for the hinge unit, a tubular insert or a corner jointing piece. Alternatively, the frame for the hinge unit may be of two part form, a trough-shaped section abutting the concrete wall closed by an L-shaped piece. ADVANTAGE- Concealed hinges, easy waterproofing and full access to interior of cubicle.

Description

The invention is also articulated with a profile-shaped entry

relates to a device for closing openings in walls, for electric concrete-casting switch stations, overlapping the sharpening hole on which they are. hinged door hinged from closed to closed position.

BACKGROUND OF THE INVENTION

Some devices are disclosed by the Applicant in DE-OS 3820 580. Here, an interlocking door for installation into a protective wall of an object and the like is described with an opening lined with S-shaped steel profiles inside which striking door panels of impact resistant material provided with a frame from U-profiles. The frame profile of this door has an inner arm extending parallel thereto and also extending dc door gaps that overlap a portion of the arm of each U-frame profile.

SUMMARY OF THE INVENTION

Based on the knowledge of the present inventor, the object of the present invention is to provide a device which can be suitably closed by introducing the above-mentioned type, by providing inputs of monolithic concrete-switching stations, while leaving their stationary door open with a clear cross section of the door opening. In addition, the device must be easily sealed and, above all, the hinge must remain invisible from the outside.

Further improvements of the invention are set forth in the dependent claims to address this object.

According to the invention, the frame of the profile device has a section of box profiles in which an articulated hinge is attached and through which the arm section connected to the door passes during rotation which ends in the open position of the station door in front of the front wall. opening.

According to the invention, the profile of the frame must have a box-shaped profile of a drawn hollow profile, in a broader sense a rectangular cross-section, which has a shape in its interior which forms the bearing surfaces for fastening the extension and / or tube of rectangular cross section. In addition, the shaping also serves to take over the corner connector pins.

In another embodiment according to the invention, the box-like profile is composed of a rib profile as well as an angular profile complementary thereto and attached particularly firmly thereto, in the interior space of the hollow profile receiving walls for the extension and / or at least one support pin are formed. .

The rib profile has a front wall, an inner side wall and also a protruding front bridge, the complementary profile being formed by an angular profile, which preferably consists of two arms of different length, which at the end are particularly rigidly connected to the rib profile.

A bridge extends from the outer surface of the side wall of the box profile or the rib profile, on which a covering wall parallel to the side wall is connected at a pitch to the front wall as well as to the side wall, which may be inclined outwardly according to another feature.

The outer front wall and the inner side wall are preferably connected by a corner element oblique to the longitudinal axis of the cross-section, which delimits the bridge and the overlapped wall to a rebound to receive the station door in the open position. This rebound represents on the front side a rib which according to the invention tapers in the direction of rotation.

According to another feature of the invention, this rebound receives, when the door is open, a protruding web of the profile from its side. It may be part of the drawn edge profile from which the front year extends and, in the closed position, protrudes adjacent the front edge of the profile in a circular fashion. Thus, in the closed position of the door, a good seal occurs and the seal does not cause the door to rotate; the door opening angle may be greater than $ 0. As a result, the entire cross section of the door opening becomes free, since the edge profile as well as the entire door leaf of the river trunk.

Since the doorframe profile according to the invention surrounds the door opening, thus being used as side profiles, floor profile and ridge profile, it is proven to be advantageous to provide at least one protruding mold insert on the outside of the doorframe which forms with the bridge itself water channel. This is of particular importance when the frame profile is not enclosed in the concrete wall, but applied. Therefore, the overlapped wall is provided with an end sleeve which is pressed against the masonry. Despite the precise fit, it is conceivable, for example, that the rainwater passes through this sleeve in the gap between the frame profile and the masonry, especially in the area of the ridge profile. Thereafter, the described water channel can receive the penetrating water and laterally. her. Another possibility is that the open profile of the door frame or the profile of the rib with the front bridge, especially in the area of the door sill, constitutes a drainage trough in which the water condensed on the door can also be concentrated or the water running from the vents can be trusted; in the region, it extends through a hole in at least another corner of the portion.

As already mentioned, the hinge is hinged by the hinge pin projecting from the hinge mounting portion of the hinge profile and the hinge wing is pivotable about the hinge pin, so that at the height of the hinge wing area the outer side wall of the box profile is removed to allow free movement hinge wings and its replacement. In the case of a doorframe profile with a rib profile, an angular profile can additionally be used, if necessary, also an open doorframe profile.

The angled doorframes at the engagement profile are preferably used in the lock rod and at the longitudinal lock latch in the form of a short strip direction.

Especially in the case of a box-shaped profile, it is advantageous to place a plug-in strip on the inner side of the outer side wall where a part of the wall has been removed, in which an additional strip

In addition, the side wall has proved to be advantageously provided with a shaping near the inner end.

described by the outwardly facing corner wall

Within the scope of the invention, there is a particular embodiment of the hinge, the hinge pin of which is fixed in an extension which is supported in the interior space of the frame profile on the internal shape and preferably on the side wall and is also detachably fastened there. To do this, a screw inserted in or perpendicular to the longitudinal axis of the cross-section is sufficient. This attachment can easily be detached at any height.

The space provided by the hinge wing bridge in which the door is opened in the open position by the front opening edge of the doorframe profile is important for the solution of the object of the invention. This edge itself cannot be replaced by an inclined surface or the like, since it remains necessary as a support for sealing the hinged protruding door in the closed position.

The device according to the invention brings, for example, the advantage that all additional parts are inserted or screwed, which ensures a very short production time - complete doorframes. It is also possible, if necessary, to produce and concret a doorframe with a number of door openings, since all other functional parts can be retrofitted for good accessibility of the interior.

The number and position of the articulated hinges are also optional, depending on the installation.

As a further advantage, it is stated that the station doors can be adjusted from one sulphate without another.

Thus, the closure member together of the few elements corresponds to the invention for the multiple expected uses.

Poois pictures in the drawings

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments of the drawings, in which:

umočí obr.

cbr. giant.

giant.

a horizontal cross-section of the concrete wall of an electric switching station with a frame of profiles enclosing the door opening and a station door arranged therein;

a section along the line ΙΤ-ΙΓ of Fig. 1;

1 is an enlarged detail of FIG. 1 with a hinge in the frame profile shown in cross section;

a sectional view of another embodiment of the frame from the profiles and station doors in the enlarged illustration;

5, 6 is a sectional view of another embodiment of a doorframe of a doorframe;

7, 10 is a plan view of a concrete wall for a switch station with a door opening;

8, an enlarged frame profile for the switch station of FIG.

giant.

giant.

FIG. 11 is a cross-sectional view of another frame profile for the switching station shown in FIG.

Fig. 12 shows another embodiment corresponding to Fig. 1;

13 shows a vertical section through the door opening of FIG. 12 with the inside on the right:

14 shows the profile of FIGS. 12, 13 in enlarged projection; FIG.

cor. 15 shows a lower vertical sectional area of another embodiment, FIG. 16 a vertical vertical section booster of FIG. 15;

EXAMPLES OF THE INVENTION

The rectangular passage 10 of the concrete wall 12 of the selected ICC mm thickness is overlaid for the light metal, especially alloyed aluminum switching station, partially shown in FIG. Referring to the left-hand side of FIG. 1, the box-like profile 16 with two side walls 18, 18a and two front walls 20, 20a and also a bridge 22 projecting at right angles from the first side wall 18 is the wing profile 23. extending at an acute angle w, perpendicular to the bridge 22 at about 50 nm.

.a, directed to:

.cn κ

On the outside of these overlapping walls, the concrete wall 12 protrudes at both ends of the walls 24 parallel to each other and guided ribs 25, 25 ' The four profiles of the doorframe 14 so trimmed in the bevel are connected to each other as side, floor and ridge profiles in a profile frame.

Giant. 1 shows, in the interior 26 of the left box profile 16, a rectangular cross-sectional tube 28 which serves as a reinforcement then is preferably made of steel or is formed by a not shown corner projection cast from aluminum to which the bevel cutout is attached profiles 14 doorframes.

In the orifice inner space 26, any screw 28 of the rectangular section is missing completely, i.e.

- - 0. 7 L / 7 as alternatively indicated in FIG. 2, provided in the area outside the metallized hinge with a station door 3.0 fitting into the described frame of profiles. Some articulated hinges consist of a side-mounted profile 34 carrying the hinge pin 32 as well as the hinge wings 36 pivotable in a defined section about the hinge pin 32. The height h or η _{Ί of the} extension 34 or the hinge leaf 36 is about 50 mm, the diameter d of the hinge pin 32 is about 12 mm.

Its free length corresponds to the height h1 of the hinge leaf 36.

The extension 34 is formed as a cuboid Vol plan view of the apparent magnification of 34 ¹ for the pin 32 of the hinge occupies the polygonal contour and adjacent surfaces of the first side wall 18 and also with an internal shaping 21, 21a endwall £ 2 »<Qa to tone their magnification 34, the leading edge of the inner rib 33 protrudes from the second side wall 18a.

The hinge 32 has a center line A from the cross-section of the box-shaped urophile 16 to its side wall 18.

In particular, FIG. 3 illustrates a corner element 19 between the second inner form 21a and also the connection of the bridge 22 to the first side wall 18, inclined to the longitudinal axis A of the profile cross section 14 at an angle of 130 ° to 140 °, with triangular strips 39 The webs 3 are flush with the inner surfaces of the third rib 18 and both correspond to the opposing first inner shape 21 and also the mating rib edges 40 extending from the first end wall 20 and the side walls 18, 18a of the rectangular tube 28 shown in FIG. 1 left. In addition, the rib edge 40 forms a slide guide for the additional belts 42 on the second end wall 20a facing the second zebra edge 41 and the adjacent second side wall 18a as shown in FIG. 3. These are fastened in the door frame 14 above the wing 36 The hinge side 18a is shortened to the side of the rest of the rib ISr and its upper edge 18h thus formed is below the pivot or movement path of the hinge wing 36. The supplementary strip 42 is fixed with a gap 43 preferably at a distance z from the upper edge 44h that corresponds to at least twice the free length of the hinge pin 32 made of stainless steel.

The wing 36 of the hinge in mounted position squared consists of a cylindrical part ³⁶ surrounding the pin 32 of the hinge joints .'- it and not the poured bridge wings 35 with height H, the hinge wing which, in the closed position of the station door 30 in a plan view by cbr. 1, 3 extends over the cylindrical portion 22. ' The first side wall 18 and the connected first end wall up to the rib edge 40, from which the wing bridge 35 continues at an angle asi of about 50 ° as the central section 35 m. The last section tpn delimits it through an approximately parallel inner surface 35i. which, as shown in particular in dashed lines in FIG. 4, allows the rest of the rib ISr and the second rib edge 41 to be partially surrounded when the station door 30 is opened, thereby opening the station door 30 further outside the door opening delimited by the frame.

The curved wing section 35m of the wing bridge 35 extends through the gap and connects two approximately parallel sections of the wing bridge 35 from which the outwardly extending arm section 35a passes into the attachment extension 35 for receiving the station doors 30 having a molded edge profile 31 therein. the attachment attachment 35k is attached.

In the closed position, the station door 30 protrudes from the web profile 31a of the edge profile 3.1. which cannot be provided with the known seal, the second end wall 20a of the locally fixed frame profile 14, as shown in FIG. 1, passes after the opening of the station door 30 into the rebound 44 of the frame profile 14 16 mm, by which the oblique corner element 1 ° of the bridge 22 is bounded, passes into an oppositely inclined overlapped wall 24. This rebound 44 is a rib extending outwardly with a decreasing section in the x-direction of rotation.

A further particularity of the profile 14 is that the outer side of the first end wall 20 recedes against two corner formings 46, 46a of about 3 mm and also the inner side wall 18 and two parallel shaped webs 48, 48a projecting from the web. 22, or wall 47 of corner molding 46, outside the mold / space 5 '. This advantageous headstock also serves as a shear belt for the concrete wall 12. On the opposite corner of the second corner form 46a, a third leg form 46b is formed, which further serves as a water barrier when the swelling circuit is used.

In Fig. 1 on the right shows three different positions of open station door 30 with an opening angle gamma of 90 ^C, 115 ° and 120 °.

In contrast to the above-described doorframe profile 14 with the closed box profile 16, another doorframe profile 14a is formed open, comprising a rib profile 52 having a web 22 and an overlapped wall 24, with a second end wall 2Ca, corner member 19, first side wall 18 and c by a reduced inner front web 34 of length n which is shorter than half the internal width e of the profile, which is about 40 mm. The remaining profile is shown in Fig. 4. The length of the insertion space or the spacing f between the triangular strip 39 and the inner first shape 21 for the tube 28 of rectangular cross-section is about 50 mm.

The outer second end wall 20a is terminated by an angle 56 which delimits with the second rib edge 41 the insertion space of the longitudinal edge 58 of the long arm 60 of the angle profile 61, near the longitudinal edge 58 the thickness of the angle profile extends to 5 mm to form a shoulder. on which the angle? 6 of the rib profile 52 is mounted. Also, the front bridge 54 ends at a second shoulder 59, which is formed on the shorter arm 62 of the angle profile 61.

An additional angular nrofile 61 is formed only where it can assume a bearing or safety function, for example, extends in the region of the extension 34, is bolted to the front bridge p4

The IC in the axis 6ja and also at the end of its longer arm 60 is provided with a support pin which firmly penetrates the angle 96 of the other profile 14a bristly and the end circumference of the angle profile S1 also pushes the extension 3.4 against the inner side of the first side wall 18.

Here, the wing bridge 35 delimits a nearly triangular space 37 in cross-section, since in the closed position it protrudes from another frame profile 14a perpendicularly and outside it, after a small spacing, breaks off the middle section 35m and continues without a clip 36 k as a clip strip 39f. The offset rate δ here is 6 mm, per cbr. 3, an angle profile 61 is formed in FIG. 4, a latch profile 64b is shown in FIG. 4, and here too the arm 60 is screwed on. pin 6 ?.

Also in the dowel 64a and the pin into the longer one

In the right part of FIG. 92 of the rib 92 in the wall 12, the edge is shown by a preferential cross section of the axial mesh of the conical tapering throat of paradise. beto serves to the penetration without reloading to behind the fasteners in this version connected to the door frame by pushing the door frame. The profile with mortar 90, so described after curing mortar 90 t ^? the rib 13 with the edge 13 is an arcuate engagement with the aperture 69 of the display which, through this door opening, ventilates, except in FIG. 4, a corner element 19 which is not formed on the side of the frame of the figure; sill or base frame made of profile. 69, accumulated rainwater can be discharged and condensation water can also be discharged.

pcs about nhT ·.

alternatively, both the described wing bridge pd in the closed box-shaped profile 16 are shown, the overlapping wall 24 being provided with a collar instead of a second blade 29a eh.

2pb with an L-shaped cross-sectional wall adjoining 12. From the first side wall 15, the insert 6 protrudes on the concrete mold 6, which delimits the inner surface of the bridge 22, at least on the ridge of the wound from the profiles, the drainage groove 6? also for penetrating water.

This embodiment is used in, for example, the penetration 11 formed by steel angles 70, but without a firm connection to the concrete wall 12.

The offset formed by the third corner shape 46b is further adjacent to the impermeable second angular profile 72 with the gasket 73. This corresponds to the transverse design of the web profile 31a of the station door 30. Thus, in this embodiment, the seals 73 and the moving seals are fixed.

Also, the casing profile 16 of the frame according to FIG. 6 is seated in the passage 11 near the steel angle 70, whereby the resulting connecting gap 7.6 between the first side wall 18 and the steel angle 70 overlaps at least one sealing strip 76 '.

The two further frame profiles 14b of FIG. 8.9 are formed according to the lining 10, wherein the sealing profile rib 80 with L-shaped ground with the end edge 81 on its short arm 82 aligns in FIG. 6 to the inside of the wall and FIG. 9 to the outside of the wall.

The cross-section of the switch box of FIG. 10 is LT-shaped, the end edge of the arm wall 12s having the profile of FIG. 11. This profile consists of a box-like profile 16 whose second corner shape 46a extends parallel to the second side wall 18a an L-shaped rail 84 whose long arm 89 is tightly applied to the lining 10.

The corner shaping wall 47 described in FIG. 3 on another corner shaping 46 is here a portion of the U-shaped shaped belt 86 that abuts the short arm 62 on the outside of the arm wall 12s. Between the box-like profile 16, the shaped strip 65, the short leg 82, the second short leg 83, and also part of the lining, a rectangular hollow astronomical space 88 is formed.

In FIGS. 8, 9, 11, only the station doors 30 are shown in an open position 110, 120

The stationary door 10 according to FIGS. 12, 13, whose measure 1 here is 2,120 mm, the door thickness r is about 40 mm and the width s 1,120 mm, has an outer aluminum plate 29 $ inner aluminum sheet 29i ♦ also of the end 65 with rotating handle 6pa with three-point closing and emergency function. On both sides, around the latch 69, there are horizontal drawn reinforcing profiles 52, consisting of a box-shaped profile with diagonal X-shaped cross-sectional walls which in the middle are shaped into a C profile, between the aluminum plate 29 and aluminum sheet 29i. a 30 W thermal insulation mat is placed

The vertical latch bar 94 of the stationary door closing bar 3.0 cooperates with the roller blocks ^G 5, which are fastened by screws 96 passing through the twist profile 14ε.

In the circumference of the base door pedestal 40, an aluminum cover 29 is formed of an aluminum plate 29 with a downwardly open venting groove, which is tensioned by a perforated metal sheet 90 with an S-shaped cross-section.

On the second rib 2pa of the frame profile 14e in FIGS. 12-14, the collar 25b is formed by wall notches to fit the sealing strip 52, corresponding to the rib cross section 25c of FIG. 14 with a square profile 51 can be screwed to the corner of the frame profile 14e to form door stop.

In Fig. 14, lower right, there is an L-shaped rib 99 on the first side wall 18. which, with the side wall section 18, forms a space for receiving the clamping profile 100 in cross-section in the form of double angles.

In Fig. 15, the lower square profile 51 extends at the height of the intermediate floor 8 into which the end of the lower vertical stop 94 can be inserted.

Claims (24)

1) Apparatus for closing openings in walls, in particular inlets of a switching station, for example, electric casting stations made of concrete with a frame made of profiles overlapping the opening lining and also with at least one stationary door (30) pivotable from closed to open and mounted thereon an articulated slide, characterized in that the frame of profiles is formed by a box-shaped section (16, 52, 61) in which the articulated hinge is mounted and through which the arm section (35a) passes during rotation which ends in the open position of the station door ( 30) in front of the end wall (20a) of the box section section (16). The opening device according to claim 1, characterized in that the angle (?) Of the station door (30) is more than 90. Device according to claims 1), 2) characterized in that the box-like profile (16) is formed by a drawn hollow profile of rectangular cross-section and its inner space (26) is provided with a shaping (21, 21a, 38, 39, 4G). which form a bearing surface for the extension (34) and / or the oven (28) of rectangular cross section and / or the corner fitting. Device according to claims 1), 2) characterized in that the frame profile section consists of a rib profile (52) as well as at least one angle profile (61) added thereto and attached to it (61), wherein in the interior space (26), the bearing surfaces (18, 20a, 54), the jrc extension (34) and / or the at least one support pin (63) are formed. A device according to claim 4, characterized in that the angular profile (61) is located in the region of the latch (64). Device according to claims 1) or 4), characterized in that the rib profile (52) to which the angle profile (61) is connected has a front wall (20a), an inner side wall (18) and also an inner wall protruding therefrom. bridge (54). Device according to claims 4) or 6), characterized in that the angle profile (61) has arms (60, 62) of different lengths which are attached at the ends to the rib profile (52). Device according to at least one of Claims 1 to 7, characterized in that a bridge G extends from the outer surface of the side wall (15) of the box profile (16) or the rib profile (52) to which it is spaced from the outer end wall (20a). and side walls (18) connected parallel to the side wall (18) by an overlapped wall (24). 2)> Device according to claim 8, characterized in that the overlapped wall (24) is provided outside the web (22) with a rib (25) parallel to it, which is also provided with a sealing element. Device according to claims 6) or 9), characterized in that the sealing element is formed by a sealing strip protruding from the rib (25) or by a sealing tape (27) which is received in the collar (25b) on the rib (25a). Device according to at least one of Claims 1 to 8, characterized in that the outer front wall (20a) and the inner side wall (13) of the frame profile (14, 14a, 14b) are connected by a corner element (19) inclined to the longitudinal a cross-sectional axis (A) shortening the inner and particularly outer side (18a, 60) and the outer and especially inner end (20, 61), which element (19) delimits the concealed wall (24) and the bridge (22) rebound (44). 3. The regulation according to claim 1, wherein the corner element (19) in the frame profile (14, 14a, 14b, 52) used in the ridge or pedestal is at least coated. 12) 13) ones; aperture (69) and a new element (19) - beneath the overlapped wall (24) opposite the rhons forms a bench in horizontal position. Device according to claims 3), characterized in that the corner element (11) is (11) or (12) characterized in that it is triangularly shaped inside O3S ' Device according to one of the claims 11), characterized in that the corner element (19) grips with the longitudinal axis (A) by 14CJ preferably 135 · Joint sectional angle ^Ι3θ ν azvyznačující ip) Device Oodle one of claims 11) NW 14), characterized in that the rebound reverse rotation in the direction narrowed. 16) Equipment oodle - 5) characterized in that the rebound (44) is designed to accommodate at least portions laterally projecting from the edge profile (31) of the station door (30). Device according to at least one of Claims 1 to 16, characterized in that the profile web (31a) extends from the leading edge of the edge profile (31) of the station door (30) and projects beyond the adjacent leading edge in the closed position of the door (30). the profile (14, 14a, 14b) of the doorframe. Device according to at least one of Claims 1 to 17, characterized in that at the end of the side wall (18), a corner form wall (47) is formed parallel to the web (22). Device according to at least one of Claims 1 to 18, characterized in that the outer side of the side wall (18) is provided with at least one mold insert (66) in addition to the web (22), the insert (66) being provided. the mold, the bridge (22) and the corresponding side wall section (18) form a channel for draining water. .Γ7 ·; ιΤ '· / ^Γ χ7 ·': · 3C> -. - 1? Device according to at least one of claims 1) to 17), characterized in that the part of the side wall (18r, 18h) lying outside the installation forms with the edges (40, 41) of the ribs projecting from the end wall (20, 20a). at least one additional belt (42). Device according to at least one of Claims i) to 20), characterized in that an arm-shaped corner form (46b) is formed on the corner of the outer side wall (lie) and the inside face wall (20) to accommodate the sealing second angle profile (46). 72) outside the side wall (18). Apparatus according to at least one of claims 1 to 21, characterized in that the ground (25c) is attached in that a removable square profile (51) is provided on the outer side wall (18a) and is provided with a groove for the sealing strip (27). Device with a fixed part of an articulated bolt and an articulated hinge pin (32) around which there is an articulated bolt pivot (36) according to one of the preceding claims, characterized in that the articulated bolt (32) is fixed in the extension (34) which is also removably fastened in the interior space (26) of the frame profile (14, 14a, 14b) by the internal shaping (21, 21a) or the third rib (38) and the side wall (IS). Device according to at least one of Claims 1 to 22), characterized in that the angle profile (61) is screwed to the rib profile (52) and the fixed extension (34). or the fitting according to claim 23) or fills half of the ribs at the rear profile (52) of the rib and the wall (18), is screwed to the eventual front bridge (54). (24) characterized in that the section of the box-shaped profile (16 adjoins the inner portion of the lateral inner shape (21)); Device according to at least one of Claims 23) to 25), characterized in that the extension (34) is maintained from the outer front wall (18a) by a third rib (36) and / or a pin (6). · Supporting Device according to at least one of Claims 1 to 26, characterized in that the sash bridge (35) extends in the closed position substantially along the inner side wall (18) and the inner (20) ΌΓ2 pointedly shorter arms (52) J ex passport ρ V ( dk \ 55I *) eventually p clipping our ici kc.l ~ k d Ruhé lateral wall (18a ) 2 ^e 4,> wA -L. fa. C 1 through intermediate intermediate section i-c; -v \ Apparatus according to at least one of claims 1 to 27, characterized in that the distance of the sash bridge (35) from the pivot axis of the hinge chalk (36) than the distance of the end of the second front side (hinge). 9. The device according to claim 1, wherein: the hinge p (32) is an ulcer. outside the longitudinal axis (a) of the transverse cross-section of the profile (14, 14a, 14b), near the side walls (13).