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

[0001] Viewing windows, especially for air conditioning systems

[0002] 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 (HVAC system), with two spacer frames which can be inserted into the viewing opening from opposite directions and which are adjacent to one another via their end faces.

[0003] Such viewing windows for installation in viewing openings are known in a wide variety of designs. Typically, the viewing windows have a two-part structure, with one window section inserted into the viewing opening from one side and another from the other side, which are secured in the viewing opening in different ways.

[0004] EP 3 375 968 A1, for example, discloses a viewing window with two window parts that are introduced into the viewing opening from opposite directions and mounted in the viewing opening by screwing them together. For this purpose, the two window parts have appropriately designed screw sections that allow wall thickness compensation, at least to a certain extent, so that these viewing windows can also be used with different wall thicknesses. The screw sections extend into the interior of the viewing opening and form a collar covering the inner circumference of the viewing opening. Therefore, they serve not only to connect the two window parts, but also to keep any dirt, particularly from a filler provided inside the wall for insulating purposes, away from the interior of the viewing window, which could impair visibility.

[0005] A similar viewing window is known from US Pat. No. 4,525,961 A, in which the two window elements are also inserted into the viewing opening from different directions and connected to each other via a locking toothing. The locking toothing also allows for a certain degree of wall thickness compensation and is arranged on a collar covering the inner circumference of the viewing opening, thus also protecting the interior of this viewing window from dirt from the inside of the wall.

[0006] In addition, viewing windows are also known that have a simpler design, each adapted to a specific wall thickness, and can be attached to the viewing opening using additional fastening elements, such as screw bolts. To protect the interior of these viewing windows from contamination from the inside of the wall, the window elements 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 rest against each other with their ends, which also prevents dirt from penetrating the interior of the viewing window.

[0007] Even though the viewing windows described above have proven to be effective and offer reliable protection against penetrating dirt, in certain applications, the viewing windows may fog up due to changing air conditions, moisture in the wall filler, or similar factors. This can impair visibility.

[0008] The object of the present invention is therefore to provide a viewing window in which the risk of impaired visibility is reduced even under unfavorable conditions.

[0009] This task is solved in a viewing window of the type mentioned above by providing a front seal on the front sides for mutual sealing of the two adjacent spacer frames.

[0010] The end seals provided on the front sides create an airtight seal between the interior of the viewing window and the exterior. The risk of moisture penetration, for example, due to residual moisture in the filler material from the wall's manufacturing process, and the associated risk of fogging of the viewing window, is significantly reduced. The risk of impaired visibility is thus significantly reduced, even under unfavorable conditions. Advantageous embodiments and further developments are the subject of the dependent claims.

[0011] An advantageous embodiment in this context provides that the end seals are designed as sealing halves and are arranged such that the end seals of the two adjacent spacer frames form a complete, circumferential seal. In this way, two spacer frames can be used, each with only one sealing half, whose sealing halves together form a fully circumferential seal when inserted. The end seals and their arrangement can be identical on both spacer frames.

[0012] In this context, it is also of constructive advantage if the end seals extend over one half of the circumference of the spacer frame.

[0013] A further advantageous embodiment provides that the spacer frames have a substantially rectangular, in particular square, shape, and the end seals are substantially U-shaped. A substantially rectangular or substantially square shape refers to rectangles or squares whose corners are rounded with a certain radius. In such spacer frames, the end seals can be substantially U-shaped. The U-shaped end seals can extend approximately over half of the end face.

[0014] In this context, a further advantageous embodiment provides that the end seals extend along one side of the spacer frame into the middle of two adjacent sides of the spacer frame or beyond by a predetermined amount. In principle, it is sufficient to form an overall circumferential seal if the two end seals extend into the middle of two adjacent sides of the spacer frame. In this case, the seals abut in the middle when installed. To improve the sealing properties, it can also be advisable for the end seals to extend beyond the center by a predetermined amount, for example by 1 mm to 5 mm. When installed, the end seals then do not abut, but rather there is a certain overlap.

[0015] 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 by a specified amount. In this case, the seals would be flush in the corner when installed, or there would be a certain overlap here as well.

[0016] An advantageous design for achieving a reliable sealing effect provides for the end faces of the spacer frames to have a groove for accommodating the end seal. The end seal can be reliably positioned in the groove and / or sufficient compression of the end seal can be ensured.

[0017] A particularly advantageous embodiment in this context provides that the arrangement and length of the groove on the end face is adapted to the arrangement and length of the end seal in such a way that a groove is provided only in the area of ​​the end seal and the other areas of the end face do not have a groove. The groove-free areas of the end face can, in the assembled state, form a counter-sealing surface for the end seal of the opposite spacer frame to bear against. This also contributes to a reliable sealing effect. A particularly advantageous embodiment from a manufacturing and assembly point of view provides that the end seal is connected in one piece to the end face. The one-sided connection of the end seal is particularly easy to install, since the end seal does not have to be mounted as a separate part. The end seal can, for example, be injection-molded onto the end face using a two-component injection molding process.The end seal can also be foamed onto the end face. The end seal can, in particular, be made of PUR foam.

[0018] In order to cover the interior of the wall and protect it from dirt from the inside, the spacer frame can have a circumferential cover collar to cover the inner edge of the viewing opening. The cover collar prevents filler particles from penetrating the interior of the viewing window. The cover collar can be made of an opaque material. This can have aesthetic advantages because the filler provided inside the wall is not visible from the outside through the viewing window or its spacer frame. The depth of both cover collars can correspond to the wall thickness of the wall containing the viewing opening. The depth of the individual cover collars of the two spacer frames can be identical or different. For example, to cover the interior of a 40 mm thick wall using the cover collars, the cover collars of both spacer frames can have a depth of 20 mm.Alternatively, it could also be provided, for example, that one of the two frames has a depth of 10 mm and the other of the two frames has a depth of 30 mm.

[0019] A further advantageous embodiment provides for the spacer frames to have a plurality of spacers distributed around their circumference. The spacers ensure precise installation within the viewing opening, and the spacers can be adapted to the wall thickness. In this context, a further advantageous embodiment provides for the spacers to be designed and arranged such that the spacers of the two spacer frames abut one another.

[0020] In this context, it is also advantageous if the spacers are designed like spacer plugs, with a first group of spacers being designed like a male spacer plug and a second group of spacers being designed like a female spacer plug. The two spacer frames can therefore be plugged together via the spacers. This can offer advantages in terms of manufacturing. For example, it is conceivable that the manufacturer of an air conditioning system inserts the spacer frames into the viewing opening during production of the system housing and plugs these together via the spacers. The interior of the wall of the system housing can then be provided with a filler, for example by foaming in a suitable filler. The spacer frames prevent foam from seeping into the area of ​​the viewing opening.

[0021] A particularly advantageous embodiment provides that the two spacer frames are designed as identical parts or that they differ in the depth of the frame. This keeps production costs low. This is because only one tool is required to produce spacer frames designed as identical parts. If the spacer frames differ in terms of the depth of the frame, a tool can also be used to produce them, which has a tool insert that reflects the different depths of the frame. Frame depths of 15 mm, 20 mm and even 30 mm have proven advantageous. However, other depths can also be provided and can be easily produced using a corresponding tool insert. A further advantageous embodiment provides that a pane carrier carrying a viewing pane is arranged on each spacer frame.The pane carrier can be formed integrally with the spacer frame. Alternatively, the pane carriers can be designed as separate components and connected to the spacer frames. In this case, an intermediate seal can advantageously be provided between the pane carrier and the spacer frame, which also prevents the penetration of moisture into the interior of the viewing window. The intermediate seal can be designed as a separate component, for example as a sealing cord or O-ring seal. Particularly advantageously, the intermediate seal is formed integrally either onto the spacer frame or the pane carrier. For this purpose, the intermediate seal can be injection-molded onto the end face of the spacer frame or the pane carrier using a two-component injection molding process. The intermediate seal can also be foamed on. In this case, the intermediate seal can consist, in particular, of a PUR foam.The spacer frame or the disc carrier can have a groove to accommodate the intermediate seal.

[0022] The pane supports can also have an outer seal to seal the pane supports from the wall containing the viewing opening. The intermediate seal can be designed 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 can be designed to run around the entire circumference of the viewing opening. The outer seal can advantageously also be formed integrally with the pane supports. In this case, the outer seal can be manufactured with the pane support using a two-component injection molding process or can be foamed onto it. The outer seal can in particular consist of a PUR foam. The pane support can have a groove to accommodate the outer seal. In a further advantageous embodiment of the invention, the two spacer frames and the two pane supports can be detachably fastened to the viewing opening using fastening means.It is not necessary to attach the spacer frames and the pane supports separately. Instead, the spacer frames and pane supports can be removably attached to the viewing opening using common fasteners. The fasteners can be designed in such a way that a spacer frame and a pane support can be clamped against the wall from different sides of the viewing opening.

[0023] In this context, it is particularly advantageous if the fastening means are designed as screws, with one of the disc carriers being designed with through holes and the other disc carrier being designed with screw-in openings, which can particularly be designed as screw bosses, for accommodating the fastening means. The use of screws allows for a simple and reliable connection. The end seal can also be compressed via the screws to achieve the desired sealing effect.

[0024] A further advantageous embodiment provides for some, preferably all, of the fastening elements to extend through the spacers. When tightening the screws, the spacers ensure a defined connection. The risk of bending parts of the viewing window or the wall due to overtightening the screws is avoided.

[0025] It is further proposed that the pane support be provided with a cover that conceals the fastening means. This allows an aesthetically pleasing appearance in the area of ​​the screw heads that conceals the screw heads. The cover can be connected to the pane support without the need for tools, in particular by means of a snap-in connection. To enable a view through the viewing window of, for example, a machine or system located inside an air-conditioning system even in poorly lit ambient conditions, the viewing window can furthermore be provided with a light source. The light source can in particular be an LED element.

[0026] An advantageous embodiment in this context provides for the spacer frames to have a lamp holder for accommodating the lamp. The lamp can be arranged in a replaceable manner in the lamp holder. In the case of a wirelessly operated lamp, a battery can also be arranged in a replaceable manner in the lamp holder.

[0027] Finally, it is proposed that the lamp holder be located radially outside the end seals, thereby reducing the risk of moisture or dirt entering the area of ​​the lamp.

[0028] Further details and advantages of the invention are explained below with the aid of the attached drawings of two exemplary embodiments. In these drawings:

[0029] Fig. 1 is a perspective view of a first embodiment of a viewing window,

[0030] Fig. 2 is an exploded view of the viewing window from Fig. 1 ,

[0031] Fig. 3 is an enlarged view of one of the spacer frames shown in Fig. 2, Fig. 4 is a perspective sectional view through the viewing window of Fig. 1,

[0032] Fig. 5 is a view of the viewing window corresponding to the illustration in Fig. 4 in a position inserted into a viewing opening,

[0033] Fig. 6 is a side view corresponding to the view in Fig. 5,

[0034] Fig. 7 is a perspective view of a second embodiment of a viewing window and

[0035] Fig. 8 is an exploded view of the viewing window from Fig. 7.

[0036] Fig. 1 shows a perspective view of 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 a round shape in the manner of a porthole.

[0037] The viewing window 1 can be used in particular in industrial systems, such as air conditioning systems or air conditioning housings, for observing a machine, system, display or the like arranged inside them, for example in a wall or a door of the corresponding systems, which are provided with a viewing opening 101 for receiving the viewing window 1.

[0038] As the illustration in Fig. 2 clearly shows, the viewing window 1 is constructed from a multitude of individual components. In the central region, the viewing window 1 has two spacer frames 2, which partially protrude into the interior of the viewing opening 101 and on whose outer sides two pane supports 10, 11 are arranged, supporting the actual viewing pane 9. A cover 13 is also arranged on the pane support 10 on the left in Fig. 2.

[0039] 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 using an injection molding process. In the exemplary embodiment, the two spacer frames 2 are designed as identical parts and are mounted from different directions Ri, R? in the viewing opening 101 of the wall 100. In the mounted position within the viewing opening 101, the two spacer frames 2 abut one another at the end.

[0040] As shown in Fig. 3, the spacer frames 2 each have a shield collar 6 extending circumferentially around the entire circumference of the spacer frame 2. The shield collar 6 is designed like a hollow cylinder. The shield collar 6 extends from a connecting region 18, to which one of the pane supports 10, 11 can optionally be connected, in the axial direction into the interior of the viewing opening 101. The plane of the connecting region 18, which extends parallel to the plane of the viewing pane 9, encloses a right angle with the shield collar 6.

[0041] At the free end of the cover collar 6, it has an end face 3, against which the opposite spacer frame 2 rests with its end face 3, see also Fig. 4. This results in an arrangement of the two cover collars 6, which rest against one another at the end, covering the inside of the viewing opening 101, whereby the entry of dirt originating from the interior of the wall 100, for example due to a mineral filler 102, into the interior of the viewing window 1 is prevented, see also the illustration in Fig. 6. The cover collars 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.

[0042] In addition to the cover collar 6, the spacer frame 2 has a plurality of spacers 7, 8, which abut one another in the assembled position, see also the illustration in Fig. 1. In the assembled position, the spacers 7, 8 rest against one another in a pressure-tight manner. The spacers 7, 8 are arranged radially outside the cover collar 6, so that in the assembled position they are located between the cover collar 6 and the inside of the viewing opening 101.

[0043] 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 to the axis of the spacers 7, 8. A first group of spacers 7 is designed in the manner of a male plug, a second group of spacers 8 in the manner of a female plug, which can be positively inserted into one another as shown in Fig. 7. The spacer frames 2 can therefore be connected to one another via the spacers 7, 8.

[0044] In the axial direction, the spacers 7, 8 end at the level of the end face 3 of the cover collar 6, such that the spacers 7, 8 are inserted into one another when the end faces 3 of the spacer frames 2 are in contact. The opposite end of the spacers 7, 8 ends at the connecting area 18 extending transversely to the spacers 7, 8.

[0045] 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, a front seal 4 is provided in the area of ​​the end faces 3 of the cover collar 6. The front seals 4 are arranged such that the interior of the viewing window 1 is hermetically sealed in the mounted position.

[0046] The end seals 4 do not extend over the entire circumference of the end face 3, but only over half of the end face 3. In the exemplary embodiment, the end seal 4 extends along one side 6.1 of the cover collar 6 into the middle of the two adjacent sides 6.2, 6.4. Due to this arrangement and design of the end seal 4, when the spacer frames 2 are in contact with one another, a continuous seal is created, composed of the two end seals 4. In order to improve the sealing properties, it can also be provided that the two end seals 4 do not end exactly halfway along the sides 6.2, 6.4, but cover a predetermined amount more in order to provide a certain overlap.

[0047] As the illustration in Fig. 3 further shows, the end face 3 has a groove 5 in the area of ​​the end seal 4, the length and arrangement of which is adapted to the end seal 4. The groove 5 can have an angular, in particular a square, or a rounded, in particular semi-circular or partially circular, cross-section.

[0048] The seal-free areas of the end face 3 do not have a groove 5. In the assembled position, a face seal 4 and a face seal-free area of ​​the end face 3 are located opposite each other, which creates a good sealing effect.

[0049] The disc supports 10, 11 are arranged on the outer sides of the spacer frames 2 in their connecting areas 18.

[0050] An intermediate seal 16 is provided between each of the disc supports 10, 11 and the spacer frames 2. The intermediate seal 16 can be arranged either on the spacer frame 2 or on the disc supports 10, 11. The intermediate seal 16 can be designed as a separate component, for example as a sealing cord or O-ring seal. Advantageously, the intermediate seal 16 is integrally formed either on the spacer frame 2 or on the disc supports 10, 11. For this purpose, the intermediate seal 16 can be injection-molded using a two-component injection molding process. The intermediate seal 16 can also be foamed. In this case, the intermediate seal can consist, in particular, of a PUR foam. The spacer frame 2 or the disc support 10, 11 can have a groove for receiving the intermediate seal. The groove can be designed analogously to the groove 5 described in connection with the end seal 4.

[0051] While the two spacer frames 2 in the embodiment are designed as identical parts, the disc carriers 10, 11 are different components.

[0052] In the exemplary embodiment, the pane carrier 10 is mounted as an outer part on the outside of the viewing window 1. The pane carrier 10 has a plurality of 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 mounted as an inner part on the inside of the viewing window 1. The pane carrier 11 has a plurality of connecting elements designed like screw bosses 11.1.

[0053] As can be seen from the illustration in Fig. 2, a plurality of fastening elements 12 are provided corresponding to the arrangement of the through-openings 10.1 and the screw bosses 11.1 arranged in alignment with these. The fastening elements 12 are screws. The fastening elements 12 can be inserted 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 bosses 11.1 of the pane carrier 11 and screwed in. In this way, the components arranged on the inside of the viewing window 1 can be braced against the components arranged on the outside and the wall 100. In this way, the viewing window 1 can be releasably fastened in the viewing opening 101.

[0054] As can be seen, for example, in the illustration in Fig. 6, the pane supports 10, 11 each have a plug-in area 10.2, 11.2 extending in the axial direction. The pane supports 10, 11 can be plugged into the spacer frames 2 via the plug-in area 10.2, 11.2. The plug-in areas 10.2, 11.2 are designed to be circumferential for this purpose. The outer contour of the plug-in areas 10.2, 11.2 is adapted to the inner contour of the frame 6 of the spacer frames 6 to form the plug-in connection.

[0055] Transverse to the direction of the axially extending plug-in areas 10.2, 11.2, the pane supports 10, 11 each have a pane frame 10.3, 11.3 supporting the viewing pane 9. The pane frame 10.3, 11.3 rests against the wall 100 from the outside. For sealing, an outer seal 17 is provided between the pane frames 10.3, 11.3 and the wall 100. The outer seal 17 can either be designed as a separate component, such as a sealing cord or O-ring seal, or can be integrally formed on the pane supports 10, 11. For this purpose, the outer seal 17 can be injection-molded using a two-component injection molding process. The outer seal 17 can also be foamed. In this case, the outer seal 17 can consist, in particular, of a PUR foam. The disc carriers 10, 11 can have a groove for receiving the intermediate seal. The groove can be designed analogously to the groove 5 described in connection with the end seal 4.As the illustrations in Fig. 2 and Fig. 6 further show, a cover 13 is provided on the outside of the viewing window 1. The cover 13 covers the fastening elements 12. A corresponding cover is not required on the inside.

[0056] As the illustration in Fig. 6 also shows, the viewing window 1 is designed for a specific wall thickness W of the wall 100 and can only be used with this type of wall thickness W. This is because the cover collars 6 of the spacers 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 cover collars 6 of the spacer frames 2 abut one another in the middle of the wall 100 and that the end face seals 4 provided on the end faces 3 experience the necessary compression for the airtight sealing of the interior of the viewing window 1.

[0057] In order to be able to use the viewing window 1 with other wall thicknesses W, it is necessary to provide a cover collar 6 with a different depth a on the spacer frame 2. For this purpose, an interchangeable insert can advantageously be provided in the injection molding tool provided for producing the spacer frame 2. Using one or more of these interchangeable inserts, different wall thicknesses W can be reproduced without having to replace the entire tool. By using appropriate interchangeable inserts, different spacer frames 2 can be manufactured in a simple and cost-effective manner.

[0058] While the spacer frames 2 in the exemplary embodiment are designed as identical parts and their cover collars 6 have the same depth a, spacer frames 2 can also be used that differ in terms of the depth a of the spacer frames 2 but are otherwise structurally identical. This allows the spacer frames 2 to be used as a pair for different wall thicknesses W, whose added depths a correspond to the wall thickness W. Advantageously, the cover collars 6 can 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 represented in pairs. However, other depths a may also be advantageous.

[0059] The end seals 4 provided between the spacer frames 2, the intermediate seals 16 provided between the spacer frames 2 and the pane supports 10, 11, as well as the outer seals 17 provided on the pane supports 10, 11, can advantageously be arranged in a groove of the respective adjacent component and can be manufactured in a multi-component injection molding process or by foaming, in particular a PUR foam, onto one of the adjacent components, see also Fig. 4.

[0060] 1 to 6, a light source 14 is provided in the lower region of the viewing window 1, by means of which light source the viewing area of ​​the viewing window, i.e. the area that can be observed through the viewing window 1, can be illuminated. The light source 14 can be designed as an LED light source. The viewing window 1 has a light source receptacle 15 for receiving the light source 14, which is formed by one side 6.4 of the diaphragm collar 6 and also of the adjacent pane supports 10, 11 projecting radially inwards. A battery or similar device for operating the light source 14 can also be accommodated in the light source receptacle. The light source 14 can be operated from the outside of the viewing window 1 in the region of the pane support 10 via an operating element 14. The operating element 14.1 can be designed in the manner of a switch, by means of which the light source 14 can be switched on and off.The operating element 14 can also be designed in the manner of a push button switch such that the illuminant 14 lights up for a temporary period of time when the actuating means 14.1 is actuated and then switches off again automatically.

[0061] The illuminant 14 can be inserted as an assembly unit into an axial opening 15.1 of the receptacle 15 and fastened there via fastening elements 14.2.

[0062] In contrast to the embodiment shown in Figs. 1 to 6, the embodiment shown in Figs. 7 and 8 is a viewing window 1 without a corresponding illuminant 14. In this embodiment, the opening 15.1 of the illuminant receptacle 15 is closed by a blind cap 19. Otherwise, the embodiment shown in Figs. 7 and 8 corresponds in all details to the embodiment shown in Figs. 1 to 6.

[0063] The viewing window 1 can therefore be operated either with or without the light source 14.

[0064] As explained above, the viewing window 1 according to the invention is characterized by a construction that is both simple and reliably shielded from external contamination and the ingress of moisture. For this purpose, the viewing window 1 has, in the area of ​​the end faces 3 of the cover collars 6 of the spacer frames 2, a front seal 3 that seals the spacer frames 2 extending into the viewing opening 101. The front seal 4 is advantageously designed as a half seal in a manufacturing-technically advantageous manner, thereby making it possible to use spacer frames 2 designed as identical parts or spacer frames 2 that differ only in the depth a of their cover collars 6.

[0065] Reference symbol:

[0066] 1 viewing window

[0067] 2 spacer frames

[0068] 3 Front side

[0069] 4 Front seal

[0070] 5 grooves

[0071] 6 blend collars

[0072] 6.1 Page

[0073] 6.2 Page

[0074] 6.3 Page

[0075] 6.4 Page

[0076] 7 spacers

[0077] 8 spacers

[0078] 9 Viewing window

[0079] 10 disc carriers

[0080] 10.1 Passage opening

[0081] 10.2 Plug-in area

[0082] 10.3 Window frame

[0083] 11 disc carriers

[0084] 11.1 Screw dome

[0085] 11.2 Plug-in area

[0086] 11.3 Window frame

[0087] 12 fasteners

[0088] 13 Cover

[0089] 14 bulbs

[0090] 14.1 Control element

[0091] 14.2 Fastening element

[0092] 15 Lamp holder 15.1 Opening

[0093] 16 Intermediate seal

[0094] 17 Outer seal

[0095] 18 Connection area 19 Blind cap

[0096] 100 wall

[0097] 101 Viewing opening

[0098] 102 Filler

[0099] Ri direction

[0100] R? Direction

[0101] W Wall thickness a Depth

Claims

Patent 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) which can be inserted into the viewing opening (101) from opposite directions (Ri, R?) and which abut one another via their end faces (3), characterized in that an end seal (4) is provided on the end faces (3) for mutually sealing the two abutting spacer frames (2).

2. Viewing window according to claim 1, characterized in that the end seals (4) are designed as sealing halves and are arranged such that the end seals (4) of the two adjacent spacer frames (2) form a circumferential overall seal.

3. Viewing window according to claim 1 or claim 2, characterized in that the end seals (4) extend over one circumferential half 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 the end seals (4) are substantially U-shaped.

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

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 the arrangement and length of the groove (5) on the end face (3) is adapted to the arrangement and length of the end seal (4) in such a way that a groove (5) is provided only in the area of the end seal (4) and the remaining areas of the end faces (3) do not have a groove (5).

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

9. Viewing window according to one of the preceding claims, characterized in that the spacer frame (2) has a circumferential cover collar (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 frame (2) has a plurality of spacers (7, 8) distributed over its circumference.

11. Viewing window according to claim 10, characterized in that the spacers (7, 8) are designed and arranged such that the spacers (7, 8) of the two spacer frames (2) abut one another.

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

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

14. Viewing window according to one of the preceding claims, characterized in that a pane support (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 supports (10, 11) can be detachably fastened to the viewing opening (101) via fastening means (12).

16. Viewing window according to claim 15, characterized in that the fastening means (12) are designed as screws, one of the pane supports (10) being designed with through-openings (10.1) and the other pane support (11) being 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, fastening means (12) extend through the spacers (7, 8).

18. A 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. A 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 lamp holder (15) for receiving the lamp (14). 21 . Viewing window according to claim 20, characterized in that the illuminant holder (15) is arranged radially outside the end seals (4).

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