Viewing window, in particular for ac systems

Abstract

The invention relates to a viewing window (1) for installation in a viewing opening (101), in particular a viewing opening (101) of an air conditioning system, comprising two distance frames (2), which can be inserted into the viewing opening (101) from opposite directions (R1, R2) and rest against one another by way of their end faces (3), said distance frames providing, on their end faces (3), an end-face seal (4) for mutually sealing the two distance frames (2) resting against one another.

Description

The present invention relates to a viewing window for installation in a viewing opening, in particular in a viewing opening of a ventilation and air conditioning system (AC system), with two spacer frames which can be inserted into the viewing opening from opposite directions and are adjacent to each other via their end faces. Such viewing windows for installation in viewing openings are known from the prior art in a wide variety of variants. Usually, the viewing windows have a two-part structure comprising a window part inserted into the viewing opening from one side and a window part inserted into the viewing opening from the other side, which are secured in the viewing opening in different ways. For example, EP 3 375 968 A1 discloses a viewing window with two window parts which are introduced into the viewing opening coming from opposite directions and are installed in the viewing opening by being screwed to each other. For this purpose, the two window parts have correspondingly designed screw connection sections which also allow wall thickness compensation at least to a certain extent, which is why these viewing windows can also be used with different wall thicknesses. The screw connection sections extend into the interior of the viewing opening and form an outer frame covering the inner circumference of the viewing opening, and therefore serve not only to connect the two window parts but also to keep away from the interior of the viewing window any contamination that originates, in particular, from a filler provided inside the wall for insulation purposes and may impair visibility conditions. A similar viewing window is known from US 4,525,961 A, in which the two window parts are likewise inserted into the viewing opening from different directions and connected to each other via latching teeth. The latching teeth connection also allows for wall thickness compensation to a certain extent and is arranged on an outer frame covering the inner circumference of the viewing opening, whereby the interior of this viewing window is likewise protected from contamination from inside the wall. Furthermore, viewing windows are also known which have a simpler structure, each adapted only to a specific wall thickness, and can be fastened in the viewing opening by means of additional fastening elements, such as screw bolts. In order to protect the interior of these viewing windows from contamination from the interior of the wall, the window parts inserted into the viewing opening from both sides have a spacer frame inserted into the viewing opening. In the inserted position, the spacer frames of the two window elements lie against each other via their end faces, whereby the ingress of contamination into the interior of the viewing window is likewise prevented. Even though the viewing windows described above have proven their worth and provide reliable protection against ingress of contamination, in certain applications it may nevertheless occur that the viewing windows mist up, for example due to changing air conditions, moisture present in a filler of the wall, or the like. This can lead to an impairment of the visibility conditions. The object of the present invention is to state a viewing window in which the risk of an impairment of the visibility conditions is reduced even under unfavourable conditions. This object is achieved, in the case of a viewing window of the type mentioned at the outset, in that an end seal is provided on the end faces for sealing the two adjacent spacer frames against each other. By means of the end seals provided on the end faces, the interior of the viewing window is sealed airtight to the outside. The risk of penetrating moisture, for example due to residual moisture still present in the filler from the manufacturing process of the wall, and the associated risk of the viewing window misting up is significantly reduced. The risk of impairment of the visibility conditions is thus significantly reduced even under unfavourable conditions. Advantageous embodiments and further developments are subject matter of the dependent subclaims. A beneficial design in this context provides that the end seals are designed as seal halves and are arranged in such a way that the end seals of the two spacer frames lying against each other form a continuous overall seal. In this way, two spacer frames can be used which each have only one seal half, the seal halves of which jointly form a fully circumferential continuous overall seal in the inserted state. The end seals and their arrangement can be identical on the two spacer frames. In this context, it is furthermore advantageous from a design point of view if the end seals extend over half the circumference of the spacer frame. A further advantageous embodiment provides that the spacer frames have a substantially rectangular, in particular square, shape and that the end seals are of substantially U-shaped design. A substantially rectangular or also substantially square shape is understood to mean such rectangles or also squares whose corners are rounded with a certain radius. In the case of such spacer frames, the end seals may be of substantially U-shaped design. The U-shaped end seals may extend approximately over half of the end face. In this context, a further advantageous embodiment provides that the end seals extend along one side of the spacer frame into the center of two adjacent sides of the spacer frame or beyond the same by a predetermined amount. In principle, for the formation of a continuous overall seal, it is sufficient if the two end seals extend into the center of two adjacent sides of the spacer frame. In this case, the seals abut each other in the center in the installed state. In order to improve the sealing properties, it may also be expedient for the end seals to extend beyond the center by a predetermined amount, for example by 1 mm to 5 mm. In the installed state, the end seals then do not abut each other, but rather a certain overlap results. Alternatively, it would also be conceivable for the end seals to extend along two sides of the spacer frame into two corners of the spacer frame or beyond the same by a predetermined amount. In this case, the seals abut each other in the corner in the installed state, or here too a certain overlap results. An advantageous embodiment for achieving a reliable sealing effect provides that the end faces of the spacer frames have a groove for receiving the end seal. The end seal can be reliably arranged in the groove and / or it can be ensured that the end seal is compressed sufficiently. A particularly advantageous embodiment in this connection provides that the arrangement and length of the groove on the end face are adapted to the arrangement and length of the end seal in such a way that a groove is provided only in the region of the end seal and the remaining regions of the end face have no groove. In the installed state, the groove-free regions of the end face can form a counter-sealing surface for the end seal of the opposite spacer frame. This also contributes to a reliable sealing effect. An embodiment that is particularly advantageous from a manufacturing and installation point of view provides that the end seal is connected to the end face in one piece. The one-piece connection of the end seal is particularly installation-friendly because the end seal does not have to be installed as a separate part. For example, the end seal can be injection-molded onto the end face in a two-component injection molding process. The end seal can also be foamed onto the end face. The end seal may in particular consist of a PUR foam. In order to cover the interior of the wall and protect it from contamination from the interior of the wall, the spacer frame may have a circumferential outer frame for covering the inner edge of the viewing opening. Via the outer frame, filler particles are prevented from entering the interior of the viewing window. The outer frame may consist of an optically opaque material. This may result in aesthetic advantages, since the filler provided in the interior of the wall is not visible from the outside through the viewing window or its spacer frame. The depth of the two outer frames can correspond to the wall thickness of the wall having the viewing opening. In this case, the depth of the individual outer frames of the two spacer frames can be dimensioned identically or differently. In order, for example, to cover the interior of a wall having a thickness of 40 mm via the outer frames, the outer frames of both spacer frames can each have a depth of 20 mm. Alternatively, provision could also be made, for example, for one of the two outer frames to have a depth of 10 mm and the other of the two outer frames to have a depth of 30 mm. A further advantageous embodiment provides that the spacer frames have several spacers distributed around their circumference. The spacers ensure exact installation within the viewing opening, wherein the spacers may be adapted to the wall thickness. In this regard, an advantageous embodiment further provides that the spacers are designed and arranged in such a way that the spacers of the two spacer frames lie against each other. In this regard, it is furthermore advantageous if the spacers are designed as spacer plugs, wherein a first group of spacers is designed as male spacer plugs and a second group of spacers is designed as female spacer plugs. The two spacer frames can therefore be plug-connected to each other via the spacers. This can offer manufacturing advantages. Conceivable, for example, is the case where the manufacturer of a ventilation and air conditioning system already inserts the spacer frames into the viewing opening during manufacture of the system housing and plug-connects them via the spacers. Thereafter, the interior of the wall of the system housing can be provided with a filler, for example by foaming in a corresponding filler. The spacer frames prevent foaming into the region of the viewing opening. A particularly advantageous embodiment provides that the two spacer frames are designed as identical parts or that the two spacer frames differ in the depth of the outer frames. As a result, manufacturing costs can be kept low. This is because, when manufacturing spacer frames designed as identical parts, only one tool is required. In the case that the spacer frames differ with regard to the depth of the outer frames, a single tool can likewise be used for their manufacture, said tool having a tool insert mapping the different depths of the outer frame. Depths of the outer frame of 15 mm, 20 mm and also 30 mm have proven advantageous. However, other depths may also be provided and may be producible in a simple manner by means of a corresponding tool insert. A further advantageous embodiment provides that a pane carrier carrying a viewing pane is arranged on each of the spacer frames. The pane carrier may be integrally formed on the spacer frame. Alternatively, the pane carriers may be configured as separate components and connected to the spacer frames. In this case, it may advantageously be provided that an intermediate seal arranged between the pane carrier and the spacer frame is provided, by means of which the ingress of moisture into the interior of the viewing window is likewise prevented. The intermediate seal may be configured as a separate component, for example as a sealing cord or Oring seal. The intermediate seal is particularly advantageously integrally formed either on the spacer frame or on the pane carrier. For this purpose, the intermediate seal can be injection-molded onto the end face of the spacer frame or of the pane carrier in a two-component injection molding process. The intermediate seal can also be foamed on. In this case, the intermediate seal may in particular consist of a PUR foam. The spacer frame or the pane carrier may have a groove for receiving the intermediate seal. The pane carriers may furthermore have an outer seal for sealing the pane carriers relative to the wall having the viewing opening. The outer seal may be configured as a separate component, for example as a sealing cord or O-ring seal. The outer seal can seal the edge of the viewing opening. The outer seal may be designed to run circumferentially around the entire circumference of the viewing opening. The outer seal may advantageously also be formed in one piece with the pane carriers. In this case, the outer seal can be produced together with the pane carrier in a two-component injection molding process or foamed onto the pane carrier. The outer seal may in particular consist of a PUR foam. The pane carrier may have a groove for receiving the outer seal. In a further advantageous embodiment of the invention, the two spacer frames and the two pane carriers can be detachably fastened to the viewing opening by fastening means. It is not required to fasten the spacer frames and the pane carriers separately in each case. Rather, the spacer frames and the pane carriers can be detachably fastened to the viewing opening via common fastening means. The fastening means may in particular be configured in such a way that in each case one spacer frame and one pane carrier can be clamped against the wall coming from different sides of the viewing opening. In this context, it is of particular advantage if the fastening means are designed as screws, whereby one of the pane carriers is designed with through-openings and the other pane carrier is designed with screw holes - which may in particular be designed as screw domes - for receiving the fastening means. The use of screws permits a simple and reliable connection. The end seal can also be compressed by means of the screws in order to achieve the desired sealing effect. A further advantageous embodiment provides that some, preferably all, of the fastening means extend through the spacers. When the screws are tightened, the spacers ensure a defined connection. The risk of bending of parts of the viewing window or of the wall due to screws being tightened too strongly is avoided. It is further proposed that the pane carrier is provided with a cover concealing the fastening means. In this way, an aesthetically pleasing appearance concealing the screw heads can also be achieved in the region of the screw heads. In particular, the cover can be connected to the pane carrier without tools by means of a latching connection. In order to make it possible, even under poorly illuminated ambient conditions, to look through the viewing window at, for example, a machine or installation arranged in the interior of a ventilation and air conditioning system, it may further be provided, that the viewing window has a light source. The light source may in particular be an LED element. An advantageous embodiment in this regard provides that the spacer frames have a light source holder for holding the light source. The light source can be arranged exchangeably in the light source holder. In the case of a cordless light source, a battery can also be arranged exchangeably in the light source holder. Finally, it is proposed that the light source holder is arranged radially outside the end seals, whereby the risk of ingress of moisture or dirt via the region of the light source is reduced. Further details and advantages of the invention are explained below with the aid of the accompanying drawings of two exemplary embodiments. In these drawings: Fig. 1         shows a perspective view of a first embodiment of a viewing window, Fig. 2         shows an exploded view of the viewing window from Fig. 1, Fig. 3         shows an enlarged view of one of the spacer frames shown in Fig. 2, Fig. 4        shows a perspective sectional view through the viewing window from Fig. 1, Fig. 5        shows a view of the viewing window corresponding to the represen tation in Fig. 4 in a position inserted into a viewing opening, Fig. 6         shows a side view corresponding to the view in Fig. 5, Fig. 7        shows a perspective view of a second embodiment of a viewing win dow, and Fig. 8        shows an exploded view of the viewing window from Fig. 7. Fig. 1 shows, in perspective view, a viewing window 1 for insertion into a viewing opening 101 of a wall 100, see also Fig. 6. The viewing window 1 has a substantially square shape with rounded corners, but could also have a rectangular geometry or, in the manner of a porthole, also a round shape. The viewing window 1 can be used in particular in industrial installations, such as ventilation and air conditioning systems or air-conditioning housings, for observing a machine, installation, display or the like arranged in the interior thereof, for example in a wall or a door of the corresponding installations, which are provided with a viewing opening 101 for receiving the viewing window 1. As can be clearly seen from the representation in Fig. 2, the viewing window 1 is composed of a large number of individual components. In the central region, the viewing window 1 has two spacer frames 2, which project partially into the interior of the viewing opening 101 and on the outer sides of which two pane carriers 10, 11 carrying the actual viewing pane 9 are arranged. Moreover, a cover 13 is arranged on the pane carrier 10 shown on the left in Fig. 2. The essential elements of the viewing window 1 are the two spacer frames 2. In the exemplary embodiment, the spacer frames 2 are designed as plastic components and manufactured in an injection molding process. In the exemplary embodiment, the two spacer frames 2 are designed as identical parts and are installed in the viewing opening 101 of the wall 100 from different directions R1, R2. In the installed position within the viewing opening 101, the two spacer frames 2 abut each other end face to end face. According to the representation in Fig. 3, the spacer frames 2 each have a circumferential outer frame 6 extending around the entire circumference of the spacer frame 2. The outer frame 6 is designed in the manner of a hollow cylinder. The outer frame 6 extends from a connection region 18, to which optionally one of the pane carriers 10, 11 can be connected, in the axial direction into the interior of the viewing opening 101. The plane of the connection region 18, which extends parallel to the plane of the viewing pane 9, encloses a right angle with the outer frame 6. At the free end of the outer frame 6, the latter has an end face 3 against which the opposite spacer frame 2 lies with its end face 3, see also Fig. 4. This results in an arrangement of the two outer frames 6 lying against each other via their end faces and covering the inner side of the viewing opening 101, whereby the ingress of contamination originating from the interior of the wall 100, for example on account of a mineral filler 102, into the interior of the viewing window 1 is prevented, see also the representation in Fig. 6. The outer frames 6 are made of an optically opaque material, so that it is not possible to look through the viewing window 1 into the interior of the wall 100. Besides the outer frame 6, the spacer frame 2 has a large number of spacers 7, 8 which, in the installed position, lie against each other, see also the representation in Fig. 1. In the installed position, the spacers 7, 8 bear pressure-resistantly against each other. The spacers 7, 8 are arranged radially outside the outer frame 6, so that in the installed position they are located between the outer frame 6 and the inner side of the viewing opening 101. The spacers 7, 8 are designed in the manner of plug connectors and have a through-opening for the passage of fastening means 12. The through-opening extends centrally with respect to the axis of the spacers 7, 8. A first group of the spacers 7 is designed as male spacer plugs, and a second group of spacers 8 is designed as female spacer plugs which, according to the representation in Fig. 7, can be plugged into each other in a form-fitting manner. The spacer frames 2 can therefore be plug-connected to each other via the spacers 7, 8. In the axial direction, the spacers 7, 8 end at the level of the end face 3 of the outer frame 6 in such a way that the spacers 7, 8 are plugged into each other when the end faces 3 of the spacer frames 2 lie against each other. The opposite end of the spacers 7, 8 ends at the connection region 18 extending transversely to the spacers 7, 8. In order to shield the interior of the viewing window 1 not only from contamination but also from moisture, which may originate for example from the filler 102, an end seal 4 is provided in the region of the end faces 3 of the outer frames 6. The end seals 4 are arranged in such a way that the interior of the viewing window 1 is sealed airtight in the installed position. The end seals 4 do not extend over the entire circumference of the end face 3, but in each case only over half thereof. In the exemplary embodiment, the end seal 4 extends along one side 6.1 of the outer frame 6 into the center of the two respectively adjacent sides 6.2, 6.4. Due to this arrangement and configuration of the end seal 4, a continuous seal composed of the two end seals 4 results when the spacer frames 2 lie against each other. In order to improve the sealing properties, it may also be provided that the two end seals 4 do not end exactly at half of the sides 6.2, 6.4, but cover a predetermined additional amount thereby providing a certain overlap. As can furthermore be seen from the representation in Fig. 3, the end face 3 has, in the region of the end seal 4, a groove 5, the length and arrangement of which is adapted to the end seal 4. The groove 5 may have an angular, in particular square, or a rounded, in particular semi-circular or part-circular, cross-section. The seal-free regions of the end face 3 have no groove 5. In the installed position, an end seal 4 and an end-seal-free region of the end face 3 lie opposite each other in each case, through which a good sealing effect is achieved. The pane carriers 10, 11 are arranged on the outer sides of the spacer frames 2 in their connection regions 18. An intermediate seal 16 is provided in each case between the pane carriers 10, 11 and the spacer frames 2. The intermediate seal 16 can be arranged either on the spacer frames 2 or on the pane carriers 10, 11. The intermediate seal 16 may be configured as a separate component, for example as a sealing cord or O-ring seal. The intermediate seal 16 is advantageously integrally formed either on the spacer frame 2 or on the pane carriers 10, 11. For this purpose, the intermediate seal 16 can be injection-molded on in a two-component injection molding process. The intermediate seal 16 can also be foamed on. In this case, the intermediate seal may in particular consist of a PUR foam. The spacer frame 2 or the pane carrier 10, 11 may have a groove for receiving the intermediate seal. The groove may be designed analogously to the groove 5 described in relation to the end seal 4. While the two spacer frames 2 are designed as identical parts in the exemplary embodiment, the pane carriers 10, 11 are different components. In the exemplary embodiment, the pane carrier 10 is arranged as an outer part on the outside of the viewing window 1. The pane carrier 10 has several through-openings 10.1 distributed around its circumference. In the exemplary embodiment, two through-openings 10.1 are provided per side. The pane carrier 11 is arranged as an inner part on the inside of the viewing window 1. The pane carrier 11 has several connecting elements designed in the manner of screw domes 11.1. As can be seen from the representation in Fig. 2, several fastening elements 12 are provided corresponding to the arrangement of the through-openings 10.1 and the screw domes 11.1 arranged in alignment therewith. The fastening elements 12 are screws. The fastening elements 12 can be inserted and screwed from the outside of the viewing window 1 through the through-openings 10.1 of the pane carrier 10, the central openings of the spacers 7, 8 provided on the two spacer frames 2, into the screw domes 11.1 of the pane carrier 11. In this way, the components arranged on the inside of the viewing window 1 can be clamped with respect to the components arranged on the outside and the wall 100. In this way, the viewing window 1 can be detachably fastened in the viewing opening 101. As can be seen, for example, from the representation in Fig. 6, the pane carriers 10, 11 each have a plug-in region 10.2, 11.2 extending in the axial direction. Via the plug-in region 10.2, 11.2, the pane carriers 10, 11 can be plugged into the spacer frames 2. For this purpose, the plug-in regions 10.2, 11.2 are designed circumferentially. The outer contour of the plug-in regions 10.2, 11.2 is adapted to the inner contour of the outer frames 6 of the spacer frames 6 to form the plug connection. Transversely to the direction of the axially extending plug-in regions 10.2, 11.2, the pane carriers 10, 11 each have a pane frame 10.3, 11.3 carrying the viewing pane 9. The pane frame 10.3, 11.3 bears against the wall 100 from the outside. For sealing purposes, an outer seal 17 is provided in each case between the pane frames 10.3, 11.3 and the wall 100. The outer seal 17 may either be configured as a separate component, such as a sealing cord or O-ring seal, or be integrally formed on the pane carriers 10, 11. For this purpose, the outer seal 17 can be injection-molded on in a two-component injection molding process. The outer seal 17 can also be foamed on. In this case, the outer seal 17 may in particular consist of a PUR foam. The pane carriers 10, 11 may have a groove for receiving the outer seal. The groove may be designed analogously to the groove 5 described in connection with the end seal 4. As can furthermore be seen from the representations in Fig. 2 and Fig. 6, a cover 13 is provided on the outside of the viewing window 1. The fastening elements 12 are As can moreover be seen from the representation in Fig. 6, the viewing window 1 is designed for a specific wall thickness W of the wall 100 and can be used only with this type of wall thickness W. This is because the outer frames 6 of the spacer frames 2 are adapted to the wall thickness W of the wall 100 in such a way that their depth a corresponds to half the wall thickness W. In this way, it is ensured that the end faces 3 of the outer frames 6 of the spacer frames 2 abut each other in the center of the wall 100 and that the end seals 4 provided on the end faces 3 experience the compression required for airtight sealing of the interior of the viewing window 1. In order to be able to use the viewing window 1 also with other wall thicknesses W, it is necessary to provide an outer frame 6 having a different depth a on the spacer frames 2. To this end, a replaceable insert can advantageously be provided in the injection molding tool provided for manufacturing the spacer frame 2. By means of one or more of these replaceable inserts, different wall thicknesses W can be mapped without having to replace the entire tool. By using corresponding replaceable inserts, different spacer frames 2 can be manufactured in a simple and cost-effective manner. While, in the exemplary embodiment, the spacer frames 2 are designed as identical parts and their outer frames 6 have the same depth a, spacer frames 2 may also be used which differ with regard to the depth a of the outer frames 6, but are otherwise of identical design. In this way, the spacer frames 2 can in each case be used as a pair for different wall thicknesses W, the summed depths a of which correspond to the wall thickness W. Advantageously, the outer frames 6 may have a depth a of 15 mm, 20 mm and 30 mm. With these depths a, the common wall thicknesses W of 30 mm (spacer frames designed as identical parts with a depth a of 15 mm), 35 mm (spacer frames with different depths a of 15 mm and 20 mm), 40 mm (spacer frames designed as identical parts with a depth a of 20 mm), 45 mm (spacer frames with different depths a of 15 mm and 30 mm), 50 mm (spacer frames with different depths a of 20 mm and 30 mm) and 60 mm (spacer frames designed as identical parts with a depth a of 15 mm) can be mapped pairwise. However, other depths a may also be advantageous. The end seals 4 provided between the spacer frames 2, the intermediate seals 16 provided between the spacer frames 2 and the pane carriers 10, 11, as well as the outer seals 17 provided on the pane carriers 10, 11, can advantageously be arranged in a groove of the respectively adjacent component and can be produced on one of the adjacent components in a multi-component injection molding process or by foaming on, in particular of a PUR foam, see also Fig. 4. In the exemplary embodiment according to Figs. 1 to 6, a light source 14 is provided in the lower region of the viewing window 1, by means of which the viewing area of the viewing window, i.e. that region which can be observed through the viewing window 1, can be illuminated. The light source 14 may be designed as an LED light source. For holding the light source 14, the viewing window 1 has a light source holder 15, which is formed in that one side 6.4 of the outer frames 6 and also of the adjacent pane carriers 10, 11 is offset radially inwardly. A battery or the like for operating the light source 14 may also be accommodated in the light source holder. The light source 14 can be operated from the outside of the viewing window 1 in the region of the pane carrier 10 via an actuating element 14.1. The actuating element 14.1 may be designed in the manner of a switch, via which the light source 14 can be switched on and off. The actuating element 14 may also be designed in the manner of a pushbutton switch in such a way that, when the actuating means 14.1 is actuated, the light source 14 lights up for a temporary period and then automatically switches off again. The light source 14 can be inserted as an assembly unit into an axial opening 15.1 of the holder 15 and be fastened there by fastening elements 14.2. In contrast to the configuration according to the representations in Figs. 1 to 6, the configuration according to Figs. 7 and 8 relates to a viewing window 1 without a corresponding light source 14. In this configuration, the opening 15.1 of the light source holder 15 is closed by a blind cap 19. In all other details, the configuration shown in Figs. 7 and 8 corresponds to the configuration shown in Figs. 1 to 6. The viewing window 1 can therefore optionally be operated with or without a light source 14. As has been set forth above, the viewing window 1 according to the invention is distinguished by a construction which is simple and at the same time reliably shielded against external contamination as well as penetrating moisture. For this purpose, the viewing window 1 has, in the region of the end faces 3 of the outer frames 6 of the spacer frames 2, an end seal 4 sealing the spacer frames 2 dipping into the viewing opening 101 circumferentially. The end seal 4 is advantageously designed, from the manufacturing point of view, as a half-seal, whereby the possibility is created of using spacer frames 2 designed as identical parts or such spacer frames 2 which differ merely with regard to the depth a of their outer frame 6. List of reference symbols: 1 Viewing window 2      Spacer frame 3       End face 4       End seal 5      Groove 6      Outer frame 6.1      Side 6.2     Side 6.3     Side 6.4     Side 7      Spacer 8      Spacer 9      Viewing pane 10      Pane carrier 10.1    Through opening 10.2    Plug-in region 10.3    Pane frame 11      Pane carrier 11.1    Screw dome 11.2    Plug-in region 11.3    Pane frame 12     Fastening means 13     Cover 14      Light source 14.1    Actuating element 14.2    Fastening element 15      Light source holder 15.1    Opening 16      Intermediate seal 17 Outer seal 18 Connection region 19 Blind cap 5 100 Wall 101 Viewing opening 102 Filler R1 Direction 10 R2 Direction W Wall thickness a Depth

Claims

1. Viewing window (1) for installation in a viewing opening (101), in particular a viewing opening (101) of a ventilation and air conditioning system, with two spacer frames (2) that can be inserted into the viewing opening (101) from opposite directions (R1, R2) and are adjacent to each other via their end faces (3), characterized in thatan end seal (4) is provided on the end faces (3) for sealing the two spacer frames (2) against each other.

2. Viewing window according to claim 1, characterized in that the end seals (4) are designed as seal halves and are arranged in such a way that the end seals (4) of the two spacer frames (2) lying against each other form a continuous overall seal.

3. Viewing window according to claim 1 or 2, characterized in that the end seals (4) extend over half the circumference of the spacer frame (2).

4. Viewing window according to one of the preceding claims, characterized in that the spacer frames (2) have a substantially rectangular, in particular square, shape and that the end seals (4) are of substantially U-shaped design.

5. Viewing window according to claim 4, characterized in that the end seals (4) extend along one side (6.1) of the spacer frame (2) into the center of two adjacent sides (6.2, 6.4) of the spacer frame (2) or beyond the same by a predetermined amount.

6. Viewing window according to one of the preceding claims, characterized in that the end faces (3) of the spacer frames (2) have a groove (5) for receiving the end seal (4).

7. Viewing window according to claim 6, characterized in that that the arrangement and length of the groove (5) on the end face (3) are adapted to the arrangement and length of the end seal (4) in such a way that a groove (5) is provided only in the region of the end seal (4) and the remaining regions of the end face (3) have no groove (5).

8. Viewing window according to one of the preceding claims, characterized in that the end seal (4) is connected to the end face (3) in one piece.

9. Viewing window according to one of the preceding claims, characterized in that the spacer frames (2) have a circumferential outer frame (6) for covering the inner edge of the viewing opening (101).

10. Viewing window according to one of the preceding claims, characterized in that the spacer frames (2) have several spacers (7, 8) distributed around their circumference.

11. Viewing window according to claim 10, characterized in that the spacers (7, 8) are designed and arranged in such a way that the spacers (7, 8) of the two spacer frames (2) lie against each other.

12. Viewing window according to claim 11, characterized in that the spacers (7, 8) are designed as spacer plugs, wherein a first group of spacers (7) is designed as male spacer plugs and a second group of spacers (8) is designed as female spacer plugs.

13. Viewing window according to one of the preceding claims, characterized in that the two spacer frames (2) are designed as identical parts or in that the two spacer frames (2) differ in the depth (a) of the outer frames (6).

14. Viewing window according to one of the preceding claims, characterized in that a pane carrier (10, 11) carrying a viewing pane (9) is arranged on each of the spacer frames (2).

15. Viewing window according to claim 14, characterized in that the two spacer frames (2) and the two pane carriers (10, 11) are detachably fastened to the viewing opening (101) by fastening means (12).

16. Viewing window according to claim 15, characterized in that the fastening means (12) are designed as screws, whereby one of the pane carriers (10) is designed with through-openings (10.1) and the other pane carrier (11) is designed with screw domes (11.1) for receiving the fastening means (12).

17. Viewing window according to claim 16, characterized in that some, preferably all, of the fastening means (12) extend through the spacers (7, 8).

18. Viewing window according to one of claims 16 or 17, characterized in that the pane support (10) is provided with a cover (13) concealing the fastening means (12).

19. Viewing window according to one of the preceding claims, characterized by a light source (14) for illuminating the viewing area of the viewing window (1).

20. Viewing window according to claim 19, characterized in that the spacer frames (2) have a light source holder (15) for holding the light source (14).21.Viewing window according to claim 20, characterized in that the light source holder (15) is arranged radially outside the end seals (4).

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