FR2622953A1 - ARRANGEMENT OF VISIT - Google Patents

Abstract

The invention relates to a manhole arrangement, for incorporation into pipes, tanks or pipe accessories. This arrangement is mainly composed of a section of tube 1 from which the tubular fasteners 4 of smaller diameter originate. The opposite openings of the tube section 1 are hermetically sealed by glass discs 10 which are removably attached to them, with the interposition of a gland 9, 13. The end parts 2 each have a thread 3 on which a ring is screwed. -threaded collar 11 engaged around the periphery of the glass disc 10. An annular gland 13 is placed between the glass disc 10 and the threaded ring-collar 11.

Description

ARRANGEMENT OF LOOKING FOR VISIT.

  The invention relates to a manhole arrangement for incorporation into pipelines, tanks or pipe fittings, mainly consisting of a pipe section, from which tubular fasteners of smaller diameter than the section

  of tube, starting seamlessly on diametrical sides.

  the opposing openings are hermetically closed by glass discs removably attached to the tube section, with interposition of glands. Visits of this kind are known by

  example, according to German Patent Application No. 31,450,886.

  Inspection manhole arrangements incorporated in pipes or tanks upstream or downstream of stop arrangements serve to observe the color, consistency or degree of dirt of the fluid during flow. Known manhole arrangements are manufactured by molding and comprise a pipe section bearing, on its opposite open ends, fastening-molded, welded or integrally formed flanges. In the middle section, flanged male ends are also joined by molding or welding with diametrically opposed sides of the cylindrical surface. The

  bridles mentioned in the first place serve to interpose

  inspection of the pipeline and those

  secondly, to fix the glass discs, generally

  releasably attached by means of a flanged ring with interposition of seals, so that when the discs are damaged, they can be

replace or clean them.

  It is relatively expensive to manufacture

  inspection techniques by molding technique, since for each dimension, it is necessary to prepare a

  particular model and perform the individual molding-

  is lying. Because the glasses frames must be made of different materials each time,

  namely in the same material as the pipe to which

  they must be incorporated, a manufacturer must be provided

  individual cation relatively expensive. Whereas.

  the wall thickness of the molded products is always relatively large, it is necessary to use a quantity

  of corresponding importance of tube material.

  German Patent Application No. 29 33 939 discloses a more economical method for making such manholes by providing flat bearing surfaces of glass discs shaped by molding on the tubular member in the areas surrounding the openings. This avoids the presence of dead spaces, so that the vision through the glass discs is not affected by deposited dirt, even after prolonged use of the arrangement. With this manhole arrangement according to the prior art, a section of the

  channel in which the arrangement must be interpolated

  can be used to make the latter. In this case, the section in question is made of the same material as the

  channeling, so that there is no difficulty in

  due to the pairing of different materials. The section has a smaller wall thickness than a molded product and, therefore, it requires less material and is cheap for this simple reason. The shaping of the bearing surfaces provided for the glass discs of the manhole arrangement, which must be hermetically covered by the discs in the areas of the openings

  arranged on opposite sides of the surface of

  can also be carried out in a very simple way by pressure contact, which reduces the cost of

manufacturing.

  In visit manners of the kind described, problems arise in releasably securing glass discs

  hermetically the opposite openings of the pipe section.

  According to the German patent application No. 31 45 086, on which the preamble of claim 1 is based, the glass disk is enclosed by a ring which is hermetically inserted in the end portion of the section of

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  tube through an annular seal housed in the outer peripheral surface and positioned axially by means of a retaining ring. Such a method is also provided for the manhole arrangement described in US Pat. No. 2,681,034 although in this case the seal is provided not in the peripheral surface of a ring enclosing the glass disc, but in the bearing surface thereof located in the end portion of the tube section. Neither of these similar methods makes sure that the bearing surface of the glass disk bearing against the tube section is reliably sealed or remains so even under internal pressure, because of the fact that its function the retaining ring does not exert on the glass disk an axial force, but a radially directed force. The glass disk therefore axially has a certain clearance that can give rise to leaks if the gland interposed between the disk and the pipe section does not undergo

not adequate pressure.

  In other known manhole arrangements, the glass disk is secured by screws to the pipe section by means of a pressure contact plate or a pressure contact ring. Examples are given in German Specification No. 29 33 939, German Utility Model No. 78 28 731, German Utility Model No. 71 00 720 and, for a very expensive structure using two flanges per opening,

  in the German Utility Model No. 80 24 144.

  The known manner of fixing the glass disc to the inspection manhole arrangement by means of screws has the disadvantage that it must be carried out on the arrangement of

  special operations to receive the screws.

  It is necessary either to give the manhole arrangement itself a wall thickness sufficient to be able to directly screw screws into its wall, or to provide cleats or, as in the German utility model No. 80 24 144 last cited, flanges for receiving screws. In the first case, the arrangement of

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  visit is very heavy because of its thick

  This increases the cost because of the high consumption of material. In the second case, additional machining costs are involved in installing rings (German Utility Model No. 78 28 731) or flanges (German Utility Model No. 80 24 144). In addition, we risk seeing the setting of the glass-look warp

  when welding rings or flanges.

  According to the method described in the utility model

  No. 71 00 720, the two opposite flanges of

  The glass discs are interconnected by common screws and pulled against each other when the screws are tightened, so that the glass discs seal against the openings in the arrangement.

  visit look. However, this method requires

  Screws that increase the weight of the manhole arrangement. In addition, it is necessary to have centering collars of the glass disc and, finally, the simultaneous assembly of the two

  glass discs is a laborious operation.

  The present invention aims to provide a method of fixing glass discs to arrangements of

  visit which requires only a minimal number of

  light and whose implementation is as simple as possible. The glass disc can also be released from

  very simple way and without difficulties.

  For this purpose, the invention proposes to provide, for a

  view of the kind described, the operations of

  truction following: - spare in each of the extreme parts of the tubular member annular depression in which

  a ring gland is completely inserted,

  above which the glass disc is partially inserted; - To shape on each of the extreme parts a thread on which is screwed a threaded ring bearing against the marginal periphery of the glass disc; ask in known manner a ring gland

  between the glass disc and the threaded ring-collar.

  It is relatively simple to achieve, by doing

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  appeal only to the few elements, the layout of the manhole according to the invention. A section of the ordinary or special steel tube, copper or other metal or alloy joined seamlessly with two tubular ends located on diametrically opposite sides of the pipe section is first provided. The cold endpieces are made by known techniques for stamping. One soda

  flange end caps used to incorporate the

  visit to pipes or reservoirs.

  see, or is shaped on the ends of screw threads connecting to neighboring pipe sections. It also provides a thread on each of the end portions of the pipe section. The length of the thread does not have to be

  very tall. In order to obtain the required wall thickness,

  In order to protect the threads, the end portions of the pipe section can be forced back before threading. After these relatively simple machining operations,

  the body of the manhole layout is finished.

  Then just add two glass discs, four

  annular cable glands and two tie-rings

dice to complete the layout.

  An annular gland is inserted into an annular depression in each end portion of the tube section and slightly larger in diameter than the glass discs, with each glass disc being placed over the annular gland. Only a part of the thickness of the glass disc is engaged in the annular depression, the disc slightly

  projecting beyond the end faces of the pipe section.

  The threaded collar-ring, bearing its contact surface against the glass disc and engaged over the edge thereof, is screwed onto the threaded end portion of the tube section until the two presses The tows are pressed against each other against opposite sides of the glass disk, the gaps being sealed. The screwing of the threaded collar ring and the resulting compression can be facilitated and adjusted to the

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  manual keys or possibly dynamometric

  c. In case of manual tightening, it is recommended to knur or spline the circumferential surface of the threaded collar ring so that it offers a better grip. If a key is used for tightening, it can advantageously be provided in the peripheral surface of

  the ring-collar threaded notches or facets longitu-

  dinals on which we can apply the key.

  The invention will now be described in more detail with reference to some of its embodiments illustrated by the accompanying drawings, in which:

  Figure 1 is a longitudinal section of the

look of visit;

  FIG. 2 is a side elevation corresponding to

dante; and

  Figures 3 to 6 show various modes of

  the outer contour of the ring-threaded collar

  designed to facilitate the screwing and unscrewing of the latter.

  FIG. 1 represents a section of tube 1 whose end portions 2 have threads 3. Fixing ends 4 are formed without welding on either side of the tubular member 1 and are used for connection to a pipe, to a tank or an accessory of

piping (not shown).

  Connection flanges 6 or threaded connections

  cord 7 may be provided on the end caps. The directive

  flow through the eye arrangement of

  visit is indicated by arrows 5.

  An annular depression 8 in which a press

  9 is inserted in each of the end portions 2 of the pipe section 1.

  glass 10 is placed on the gland 9; he is in particular

  engaged in depression 8 and partly projecting,

  as can be seen clearly in Figure 1.

  The glass disk 10 is removably attached to the tube section 1 by means of a threaded collar ring 11 engaged by a radial extension 12 over the edge of the glass disk 10. Another gland 13 is arranged between the threaded collar ring 11 and the glass disc 10. When rotated, the threaded collar ring 11 is screwed onto the thread 3 of one of the end portions 2

  of the pipe section 1 and therefore, it hermetically presses

  by means of the cable glands 9, 13, the

  glass disk 10 against the pipe section 1.

  To make it easier to turn the ring-threaded collar 11 (Figure 3) may present on its periphery a knurling 14 or grooves. Alternatively (Figure 4), the outer peripheral surface of the threaded collar ring 11 may also have notches 15 for applying a tool to make

turn the ring-threaded collar.

  Alternatively, the threaded collar ring 11 (Figure 5) may have flats 16 for the application of a key. The ring-threaded collar 11 can also be made in the form of a screw or a nut (polygon 17), as

shown in Figure 6.

Claims (2)

  1.- Business look layout for incorporation   to pipes, tanks or pipe fittings-   terie, composed of a tube section (1) from o tubular fastening elements (4), smaller in diameter than the tube section, starting without welding on diametrically opposite sides and whose openings the opposites are hermetically closed by glass discs (10) which are attached thereto   removable, with the interposition of cable glands,   in that in each of the end portions (2) of the tubular section (1) there is provided an annular depression (8) into which an annular gland (9) is completely inserted, over which the disc is partially inserted glass (10), in that each of the end portions (2) has a thread (3) on which is screwed a threaded ring nut (11) engaged around the edge of the glass disk (10) and that a press annular hinge (13) is placed between the glass disc (10) and the threaded collar ring (11).   2. A manhole according to claim 1, characterized in that the periphery of the threaded collar ring (11) has a knurling (14) or splines, notches (15) or key application surfaces in the form of flats (16) or polygon (17) intended to facilitate screwing or unscrewing during opening or closing as well as during assembly or dismantling of the manhole.