Observation window, in particular for air conditioning systems

Abstract

The invention relates to a viewing window (1) for installation in a viewing opening (101), in particular of an air conditioning system, comprising two spacer frames (2) which can be inserted into the viewing opening (101) from opposite directions (R1, R2) and abut against one another by their end faces (3), said spacer frames being provided on their end faces (3) with end face seals (4) for sealing the two spacer frames (2) abutting against one another from one another.

Description

Technical Field

[0001] The present invention relates to an observation window for installation in an observation opening, particularly an observation window for installation in an observation opening of a ventilation and air conditioning system (AC system), the observation window having two spacer frames that can be inserted into the observation opening from opposite directions and are adjacent to each other via their end faces. Background Technology

[0002] Various variations of such observation windows for installation in observation openings are known from the prior art. Typically, an observation window has a two-part structure, comprising a window portion inserted into the observation opening from one side and a window portion inserted into the observation opening from the other side, the window portions being fixed in the observation opening in different ways.

[0003] For example, EP 3 375 968 A1 discloses an observation window with two window portions introduced into an observation opening from opposite directions and mounted in the observation opening by screwing them together. For this purpose, the two window portions have correspondingly designed screw-connecting sections, which also allow for at least some compensation of wall thickness, which is why these observation windows can also be used with different wall thicknesses. The screw-connecting sections extend into the interior of the observation opening and form an outer frame covering the inner circumference of the observation opening, and thus serve not only to connect the two window portions but also to retain any contamination away from the interior of the observation window, particularly contamination originating from the filler provided inside the wall for insulation purposes and potentially impairing visibility.

[0004] A similar observation window is known from US 4,525,961A, in which two window portions are inserted into the observation opening from different directions and connected to each other by latching teeth. The latching tooth connection also allows for some compensation of the wall thickness and is arranged on an outer frame covering the inner circumference of the observation opening, thereby also protecting the interior of the observation window from contamination from the interior of the wall.

[0005] Furthermore, observation windows are also known, featuring a simpler structure. Each observation window is adapted only to a specific wall thickness and can be secured in the observation opening using additional fastening elements such as bolts. To protect the interior of these observation windows from contamination from the interior of the wall, the window portions inserted into the observation opening from both sides have spacer frames that also insert into the observation opening. In the inserted position, the spacer frames of the two window elements abut against each other via their end faces, thereby similarly preventing contaminants from entering the interior of the observation window.

[0006] Although the aforementioned viewing windows have proven their value and provided reliable protection against contamination, fogging can still occur in certain applications, such as due to changes in air conditions or moisture present in the wall filler. This can lead to impaired visibility. Summary of the Invention

[0007] The object of this invention is to describe an observation window in which the risk of impaired visibility conditions is reduced, even under adverse conditions.

[0008] This objective is achieved in the case of the type of observation window mentioned at the beginning, wherein end seals are provided on the end faces for sealing two adjacent spacer frames that abut against each other.

[0009] The end seals on the end faces ensure an airtight seal between the inside and outside of the viewing window. For example, the risk of moisture infiltration and associated fogging of the viewing window is significantly reduced because residual moisture remains in the filler from the wall manufacturing process. Therefore, the risk of impaired visibility conditions is significantly reduced even under adverse conditions.

[0010] Advantageous embodiments and further developments are the subject of the dependent claims.

[0011] In this context, a beneficial design provides that the end seals are designed as sealing halves and arranged such that the end seals of two spacer frames placed abutting each other form a continuous integral seal. In this way, two spacer frames can be used, each having only one sealing half, the sealing halves of the two spacer frames together forming a completely circumferentially continuous integral seal in the inserted state. The end seals and their arrangement on the two spacer frames can be identical.

[0012] In this context, from a design perspective, it would be further advantageous if the end seals extended along half the circumference of the spacer frame.

[0013] Another advantageous embodiment provides that the spacer frame has a generally rectangular shape, particularly a square shape, and the end seals have a generally U-shaped design. The generally rectangular or generally square shape should be understood to mean a rectangle or a square whose corners are rounded with a specific radius. In the case of such a spacer frame, the end seals may have a generally U-shaped design. The U-shaped end seals may extend approximately halfway along the end face.

[0014] In this context, another advantageous embodiment provides that the end seals extend along one side of the spacer frame to the center of two adjacent sides of the spacer frame or beyond the center by a predetermined amount. In principle, it is sufficient for the two end seals to extend to the center of two adjacent sides of the spacer frame in order to form a continuous, integral seal. In this case, in the installed state, the seals are abutting each other at the center. To improve sealing characteristics, it may also be convenient to extend the end seals beyond the predetermined center amount, for example, 1 mm to 5 mm. In the installed state, the end seals are not abutting each other, but rather have a certain degree of overlap.

[0015] Alternatively, it is conceivable that the end seals extend along both sides of the spacer frame into or beyond the two corners of the spacer frame by a predetermined amount. In this case, the seals are abutting each other at the corners in the installed state, or there is a certain degree of overlap therein.

[0016] An advantageous embodiment for achieving a reliable sealing effect provides that the end face of the spacer frame has a groove for receiving an end seal. The end seal can be reliably arranged in this groove and / or it can be ensured that the end seal is adequately compressed.

[0017] In this regard, a particularly advantageous embodiment provides that the arrangement and length of the grooves on the end face are adapted to the arrangement and length of the end seal, in such a way that the grooves are provided only in the region of the end seal and the remaining region of the end face is not grooved. In the installed state, the groove-free region of the end face can form a relative sealing surface for the end seals relative to the spacer frame. This also contributes to a reliable sealing effect.

[0018] A particularly advantageous embodiment from a manufacturing and installation perspective provides that the end seal is integrally connected to the end face. This integral connection of the end seal is particularly installation-friendly because the end seal does not need to be installed as a separate component. For example, the end seal can be injection molded onto the end face during a two-part injection molding process. The end seal can also be foamed onto the end face. The end seal can be specifically constructed from PUR foam.

[0019] To cover the interior of the wall and protect it from contamination from within, the spacer frame may have a circumferential outer frame for covering the inner edge of the observation opening. The outer frame prevents filler particles from entering the interior of the observation window. The outer frame may be made of an optically opaque material. This provides an aesthetic advantage because the filler material disposed within the wall is not visible from the outside through the observation window or its spacer frame. The depth of the two outer frames may correspond to the wall thickness of the wall with the observation opening. In this case, the depth of the individual outer frames of the two spacer frames may be dimensioned the same or different. For example, to cover the interior of a wall with a thickness of 40 mm, the outer frames of the two spacer frames may each have a depth of 20 mm. Alternatively, it may also be provided, for example, that one of the two outer frames has a depth of 10 mm and the other of the two outer frames has a depth of 30 mm.

[0020] Another advantageous embodiment provides that the spacer frame has a plurality of spacers distributed around its circumference. The spacers ensure precise installation within the observation opening, wherein the spacers are adaptable to the wall thickness.

[0021] In this regard, an advantageous embodiment further provides that the spacers are designed and arranged such that the spacers of the two spacer frames abut against each other.

[0022] In this regard, it is further advantageous that the spacers are designed as spacer plugs, wherein the first set of spacers is designed as convex spacer plugs and the second set of spacers is designed as concave spacer plugs. Therefore, the two spacer frames can be interlocked with each other via the spacers. This provides manufacturing advantages. For example, it is conceivable that a manufacturer of a ventilation and air conditioning system has already inserted the spacer frames into the observation openings during the manufacturing process of the system housing and plugged them together via the spacers. Subsequently, the interior of the walls of the system housing can be equipped with filler, for example, by foaming within the corresponding filler. The spacer frames prevent foaming into the area of ​​the observation openings.

[0023] A particularly advantageous embodiment proposes that the two spacer frames are designed as identical portions or that the two spacer frames differ in depth of the outer frame. Therefore, manufacturing costs can be kept low. This is because only one tool is required when manufacturing spacer frames designed as identical portions. Similarly, when the spacer frames differ in depth with respect to the outer frame, they can also be manufactured using a single tool having tool inserts that map the different depths of the outer frame. Outer frame depths of 15 mm, 20 mm, and 30 mm have proven advantageous. However, other depths can also be provided and can be produced in a simple manner using corresponding tool inserts.

[0024] Another advantageous embodiment provides a window glass carrier carrying the observation window glass arranged on each of the spacer frames. The window glass carrier can be integrally formed on the spacer frame. Alternatively, the window glass carrier can be configured as a separate component and connected to the spacer frame. In this case, it is advantageous to provide an intermediate seal disposed between the window glass carrier and the spacer frame, by which moisture is also prevented from entering the interior of the observation window. The intermediate seal can be configured as a separate component, for example as a sealing cord or an O-ring seal. The intermediate seal is particularly advantageously integrally formed on the spacer frame or the window glass carrier. For this purpose, the intermediate seal can be injection molded onto the end face of the spacer frame or the window glass carrier during a two-part injection molding process. The intermediate seal can also be foamed thereon. In this case, the intermediate seal can be particularly made of PUR foam. The spacer frame or the window glass carrier may have a groove for receiving the intermediate seal.

[0025] The window glass carrier may further have an external seal for sealing the window glass carrier relative to the wall having the observation opening. The external seal may be configured as a separate component, for example, as a sealing cord or an O-ring seal. The external seal may seal the edge of the observation opening. The external seal may be designed to extend circumferentially around the entire circumference of the observation opening. The external seal may also advantageously be integrally formed with the window glass carrier. In this case, the external seal may be produced together with the window glass carrier using a two-part injection molding process or foamed onto the window glass carrier. The external seal may be specifically made of PUR foam. The window glass carrier may have a groove for receiving the external seal.

[0026] In another advantageous embodiment of the invention, the two spacer frames and the two window glass carriers can be detachably fastened to the observation opening by a plurality of fastening devices. It is not required to individually fasten the spacer frames and window glass carriers in each case. Instead, the spacer frames and window glass carriers can be detachably fastened to the observation opening by common fastening devices. The fastening devices can be specifically configured such that, in each case, one spacer frame and one window glass carrier can be clamped against the wall from different sides of the observation opening.

[0027] In this context, it is particularly advantageous that the fastening device is designed as a screw, thus one of the window glass carriers is designed with multiple through holes and the other window glass carrier is designed with screw holes, which can be specifically designed as multiple threaded domes for receiving the fastening device. The use of screws allows for a simple and reliable connection. The end seal can also be compressed by the screw to achieve the desired sealing effect.

[0028] Another advantageous embodiment provides that some (preferably all) of the fastening devices extend through the spacer. When the screws are tightened, the spacer ensures a defined connection. This avoids the risk of bending of the viewing window or wall portion due to excessive screw tightening.

[0029] Furthermore, the window glass carrier is equipped with a cover that conceals the fastening device. This also achieves an aesthetically pleasing concealment of the screw head in the screw head area. In particular, the cover can be attached to the window glass carrier via a latching connection without tools.

[0030] To enable observation of machinery or facilities, such as those installed inside ventilation and air conditioning systems, even in poorly lit environments, the observation window may be further configured to have a light source. The light source may, in particular, be an LED element.

[0031] An advantageous embodiment in this regard provides that the spacer frame has a light source holder for holding the light source. The light source is replaceably arranged in the light source holder. In the case of a wireless light source, a battery can also be replaceably installed in the light source holder.

[0032] Finally, it is proposed that the light source holder is arranged radially outside the end seal, thereby reducing the risk of moisture or dirt entering through the area of ​​the light source. Attached Figure Description

[0033] Further details and advantages of the invention will now be illustrated with reference to the accompanying drawings of two exemplary embodiments. In these drawings:

[0034] Figure 1 A perspective view of a first embodiment of the viewing window is shown.

[0035] Figure 2 It shows Figure 1 The exploded view of the observation window.

[0036] Figure 3 It shows Figure 2 An enlarged view of one of the spacer frames shown;

[0037] Figure 4 It shows crossing Figure 1 The perspective cross-sectional view of the observation window.

[0038] Figure 5 It shows the corresponding Figure 4 The view shown in the illustration is positioned where it is inserted into the observation opening.

[0039] Figure 6 It shows the corresponding Figure 5 The side view of the view in the middle.

[0040] Figure 7 A perspective view of a second embodiment of the viewing window is shown, and

[0041] Figure 8 It shows Figure 7 An exploded view of the observation window. Detailed Implementation

[0042] Figure 1 A perspective view shows the observation window 1 for insertion into the observation opening 101 of the wall 100, see also Figure 6 The observation window 1 has a roughly square shape with rounded corners, but it can also have a rectangular geometry or a circular shape in the manner of a porthole.

[0043] The observation window 1 can be used, in particular, in industrial facilities such as ventilation and air conditioning systems or air conditioning enclosures, for observing machines, facilities, displays or the like arranged inside them, for example in the walls or doors of the respective facilities, which are equipped with observation openings 101 for receiving the observation window 1.

[0044] As from Figure 2 As can be clearly seen from the diagram, the observation window 1 is composed of numerous individual components. In the central region, the observation window 1 has two spacer frames 2, which partially extend into the interior of the observation opening 101 and have two window glass carriers 10, 11 arranged on their outer sides to support the actual observation window glass 9. Furthermore, a cover 13 is arranged... Figure 2 The window glass carrier 10 is shown on the left side of the middle.

[0045] The main components of the observation window 1 are two spacer frames 2. In this exemplary embodiment, the spacer frames 2 are designed as plastic parts 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 observation opening 101 of the wall 100 from different directions R1, R2. In the installation position within the observation opening 101, the two spacer frames 2 are end-to-end abutting each other.

[0046] according to Figure 3 As illustrated in the diagram, each spacer frame 2 has a circumferential outer frame 6 extending around its entire circumference. The outer frame 6 is designed in the form of a hollow cylinder. The outer frame 6 extends axially from the connection region 18 into the interior of the observation opening 101, to which one of the window glass carriers 10 and 11 may optionally be connected. The plane of the connection region 18, extending parallel to the plane of the observation window glass 9, forms a right angle with the outer frame 6.

[0047] At the free end of the outer frame 6, the outer frame 6 has an end face 3, and the opposing spacer frame 2 abuts against this end face 3 with its end face 3. See also Figure 4 This results in an arrangement where two outer frames 6 are placed abutting each other via their end faces and cover the inside of the observation opening 101, thereby preventing contamination from the interior of the wall 100 (e.g., due to the mineral filler 102) from entering the interior of the observation window 1. See also... Figure 6 The outer frame 6 is made of an optically opaque material, making it impossible to see the interior of the wall 100 through the observation window 1.

[0048] In addition to the outer frame 6, the spacer frame 2 also has a large number of spacers 7 and 8, which abut against each other in the installation position. (See also...) Figure 1 The diagram shows that, in the installation position, spacers 7 and 8 are pressure-resistantly supported by each other. Spacers 7 and 8 are arranged radially outside the outer frame 6 such that, in the installation position, they are located between the outer frame 6 and the inner side of the observation opening 101.

[0049] Spacers 7 and 8 are designed as plug connectors and have through holes for fastener 12 to pass through. The through holes extend centrally relative to the axes of spacers 7 and 8. The first set of spacers 7 is designed as a convex spacer plug, and the second set of spacers 8 is designed as a concave spacer plug, according to... Figure 7 As indicated in the diagram, these spacer plugs can be inserted into each other in a form-fitting manner. Therefore, the spacer frame 2 can be connected to each other via spacers 7 and 8.

[0050] In the axial direction, spacers 7 and 8 terminate at the horizontal level of the end face 3 of the outer frame 6, such that when the end faces 3 of the spacer frame 2 are placed abutting each other, spacers 7 and 8 are inserted into each other. The opposite ends of spacers 7 and 8 terminate at the connecting area 18 extending transversely to spacers 7 and 8.

[0051] To protect the interior of the observation window 1 from contamination and moisture (which may originate from, for example, filler 102), an end seal 4 is provided in the region of the end face 3 of the outer frame 6. The end seal 4 is arranged such that the interior of the observation window 1 is airtight in the mounting position.

[0052] The end seals 4 do not extend over the entire circumference of the end face 3, but rather extend only over half of it in their respective cases. In this exemplary embodiment, the end seals 4 extend along one side 6.1 of the outer frame 6 into the center of two correspondingly adjacent sides 6.2, 6.4. Due to this arrangement and configuration of the end seals 4, a continuous seal is created by the two end seals 4 when the spacer frames 2 are placed abutting against each other. To improve sealing performance, it can also be provided that the two end seals 4 do not terminate precisely at half of the sides 6.2, 6.4, but rather cover a predetermined additional amount, thereby providing a certain degree of overlap.

[0053] As from Figure 3 As can also be seen in the illustration, end face 3 has a groove 5 in the region of end seal 4, the length and arrangement of which are adapted to end seal 4. The groove 5 may have an angled (especially square) or circular (especially semi-circular or partially circular) cross-section.

[0054] The unsealed area of ​​end face 3 does not have groove 5. In the installation position, the end seal 4 of end face 3 and the area without end seal are opposite each other in their respective cases, thereby achieving a good sealing effect.

[0055] Window glass carriers 10 and 11 are arranged on the outside of the spacer frame 2, in their connection area 18.

[0056] In each case, an intermediate seal 16 is provided between the window glass carrier 10, 11 and the spacer frame 2. The intermediate seal 16 can be disposed on the spacer frame 2 or on the window glass carrier 10, 11. The intermediate seal 16 can be configured as a separate component, for example, configured as a sealing cord or O-ring seal. The intermediate seal 16 is advantageously integrally formed on the spacer frame 2 or the window glass carrier 10, 11. For this purpose, the intermediate seal 16 can be injection molded during a two-part injection molding process. The intermediate seal 16 can also be foamed thereon. In this case, the intermediate seal can be specifically constructed of PUR foam. The spacer frame 2 or the window glass carrier 10, 11 can have a groove for receiving the intermediate seal. This groove can be designed similarly to the groove 5 described with respect to the end seal 4.

[0057] Although the two isolating frame 2 are designed as the same part in this exemplary embodiment, the window glass carriers 10 and 11 are different components.

[0058] In this exemplary embodiment, the window glass carrier 10 is arranged as the outer portion on the outer side of the observation window 1. The window glass carrier 10 has a plurality of through holes 10.1 distributed around its circumference. In this exemplary embodiment, two through holes 10.1 are provided on each side. The window glass carrier 11 is arranged as the inner portion on the inner side of the observation window 1. The window glass carrier 11 has a plurality of connecting elements designed in the manner of threaded domes 11.1.

[0059] As from Figure 2As shown in the diagram, a plurality of fastening elements 12 are provided corresponding to the arrangement of the through hole 10.1 and the threaded dome 11.1 aligned therewith. The fastening elements 12 are screws. The fastening elements 12 can be inserted from the outside of the observation window 1 through the through hole 10.1 of the window glass carrier 10, the central openings of the spacers 7 and 8 provided on the two spacer frames 2, and screwed into the threaded dome 11.1 of the window glass carrier 11. In this way, components arranged on the inside of the observation window 1 can be clamped relative to components arranged on the outside and the wall 100. In this way, the observation window 1 can be detachably fastened in the observation opening 101.

[0060] For example, as from Figure 6 As shown in the diagram, the window glass carriers 10 and 11 each have insertion regions 10.2 and 11.2 extending in the axial direction. Through the insertion regions 10.2 and 11.2, the window glass carriers 10 and 11 can be inserted into the spacer frame 2. For this purpose, the insertion regions 10.2 and 11.2 are designed circumferentially. The outer contours of the insertion regions 10.2 and 11.2 are adapted to the inner contour of the outer frame 6 of the spacer frame 6 to form a plug-in connection.

[0061] In a direction transverse to the axially extending insertion regions 10.2 and 11.2, the window glass carriers 10 and 11 each have window glass frames 10.3 and 11.3 that support the observation window glass 9. The window glass frames 10.3 and 11.3 abut against the wall 100 from the outside. For sealing purposes, an outer seal 17 is provided between the window glass frames 10.3 and 11.3 and the wall 100 in each case. The outer seal 17 can be configured as a separate component, such as a sealing cord or O-ring seal, or integrally formed on the window glass carriers 10 and 11. For this purpose, the outer seal 17 can be injection molded during a two-component injection molding process. The outer seal 17 can also be foamed thereon. In this case, the outer seal 17 can be specifically made of PUR foam. The window glass carriers 10 and 11 can have grooves for receiving the outer seal. The grooves can be designed similarly to the groove 5 described for the coupling end seal 4.

[0062] As from Figure 2 and Figure 6 As can be further seen in the illustration, cover 13 is positioned outside the observation window 1. Cover 13 covers the fastening element 12. No suitable covering is required inside.

[0063] In addition, such as from Figure 6As shown in the diagram, the observation 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 outer frames 6 of the spacer frame 2 are fitted to the wall thickness W of the wall 100 in such a way that their depth a corresponds to half of the wall thickness W. In this way, it is ensured that the end faces 3 of the outer frames 6 of the spacer frame 2 are abutting each other at the center of the wall 100, and that the end seals 4 provided on the end faces 3 undergo the compression required to achieve an airtight seal inside the observation window 1.

[0064] In order to enable the use of observation windows 1 with different wall thicknesses W, it is necessary to provide outer frames 6 with different depths a on the spacer frame 2. For this purpose, replaceable inserts can be advantageously provided in an injection molding tool used to manufacture the spacer frame 2. Different wall thicknesses W can be mapped using one or more of these replaceable inserts without replacing the entire tool. By using the appropriate replaceable inserts, different spacer frames 2 can be manufactured in a simple and cost-effective manner.

[0065] Although in this exemplary embodiment, the spacer frames 2 are designed as identical components and their outer frames 6 have the same depth a, spacer frames 2 may also be used that differ in depth a of the outer frames 6 but have the same design in other respects. In this way, the spacer frames 2 can, in their respective cases, be used as a pair for different wall thicknesses W, the sum of the depths a of the spacer frames 2 corresponding to the wall thickness W. Advantageously, the outer frames 6 may have depths a of 15 mm, 20 mm, and 30 mm. These depths 'a' allow for pairwise mapping of common wall thicknesses W: 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). However, other depths 'a' can also be advantageous.

[0066] The end seals 4 disposed between the spacer frames 2, the intermediate seals 16 disposed between the spacer frames 2 and the window glass carriers 10 and 11, and the outer seals 17 disposed on the window glass carriers 10 and 11 can advantageously be disposed in the grooves of the respective adjacent components, and can be produced on one of the adjacent components during multi-component injection molding or by foaming (especially PUR foam), see also Figure 4 .

[0067] According to Figures 1 to 6 In an exemplary embodiment, a light source 14 is provided in the lower region of the observation window 1, illuminating the observation area of ​​the window (i.e., the area observable through the observation window 1) by means of the light source. The light source 14 may be designed as an LED light source. To hold the light source 14, the observation window 1 has a light source holder 15, which is formed radially inwardly offset on one side 6.4 of the outer frame 6 and the adjacent window glass carriers 10, 11. Batteries or the like used to operate the light source 14 may also be housed in the light source holder. The light source 14 can be operated from the outside of the observation window 1 in the region of the window glass carrier 10 via an actuator 14.1. The actuator 14.1 may be designed as a switch, allowing the light source 14 to be turned on and off. The actuator 14 may also be designed as a push-button switch, such that when the actuator 14.1 is actuated, the light source 14 illuminates for a short period and then automatically turns off again.

[0068] The light source 14 can be inserted as an assembly unit into the axial opening 15.1 of the retainer 15 and fastened thereto by the fastening element 14.2.

[0069] According to Figures 1 to 6 Compared to the configuration shown in the diagram, according to Figure 7 and Figure 8 The configuration involves an observation 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 cover 19. In all other details, Figure 7 and Figure 8 The configuration shown corresponds to Figures 1 to 6 The configuration shown in the image.

[0070] The observation window 1 can therefore be operated optionally with or without the light source 14.

[0071] As described above, the observation window 1 according to the invention is characterized by its simple structure and reliable shielding against external contamination and moisture penetration. For this purpose, the observation window 1 has an end seal 4 in the region of the end face 3 of the outer frame 6 of the spacer frame 2, which seals the spacer frame 2 recessed into the observation opening 101. From a manufacturing perspective, the end seal 4 is advantageously designed as a semi-sealed element, thereby creating the possibility of using spacer frames 2 that are designed as identical parts or differ only in the depth a of their outer frame 6.

[0072] Reference symbol list:

[0073] 1 Observation Window

[0074] 2 Spacer Frame

[0075] 3. End face

[0076] 4. End seals

[0077] 5 grooves

[0078] 6. Outer Frame

[0079] 6.1 Side View

[0080] 6.2 Side View

[0081] 6.3 Side View

[0082] 6.4 Side View

[0083] 7 Spacers

[0084] 8 spacers

[0085] 9. Observation window glass

[0086] 10 Window glass carrier

[0087] 10.1 Through Hole

[0088] 10.2 Insertion Region

[0089] 10.3 Window glass frame

[0090] 11 Window glass carrier

[0091] 11.1 Threaded Dome

[0092] 11.2 Insertion Region

[0093] 11.3 Window glass frame

[0094] 12 Fastening devices

[0095] 13 Covers

[0096] 14 Light Source

[0097] 14.1 Actuating element

[0098] 14.2 Fastening elements

[0099] 15 Light source holding components

[0100] 15.1 Opening

[0101] 16 Intermediate Seal

[0102] 17 External seal

[0103] 18 Connecting Areas

[0104] 19 Blind Cover

[0105] 100 wall

[0106] 101 Observe the opening

[0107] 102 Filler

[0108] R1 direction

[0109] R2 direction

[0110] W wall thickness

[0111] a depth

Claims

1. An observation window (1) for installation in an observation opening (101), particularly in an observation opening (101) of a ventilation and air conditioning system, the observation window having two spacer frames (2) that can be inserted into the observation opening (101) from opposite directions (R1, R2) and are adjacent to each other via end faces (3) of the spacer frames (2). Its features are, The end face (3) is provided with an end seal (4), which is used to seal the two spacer frames (2) that abut against each other.

2. The observation window according to claim 1, characterized in that, The end seal (4) is designed as a seal half and arranged in such a way that the end seals (4) of the two spacer frames (2) placed abutting each other form a continuous integral seal.

3. The observation window according to claim 1 or 2, characterized in that, The end seal (4) extends over half the circumference of the spacer frame (2).

4. The viewing window according to any one of the preceding claims, characterized in that, The spacer frame (2) has a generally rectangular shape, particularly a square shape, and the end seal (4) has a generally U-shaped design.

5. The observation window according to claim 4, characterized in that, The end seal (4) extends along one side (6.1) of the spacer frame (2) to the center of two adjacent sides (6.2, 6.4) of the spacer frame (2) or beyond the center by a predetermined amount.

6. The viewing window according to any one of the preceding claims, characterized in that, The end face (3) of the spacer frame (2) has a groove (5) for receiving the end seal (4).

7. The observation window according to claim 6, characterized in 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) such that the groove (5) is provided only in the region of the end seal (4) and the remaining region of the end face (3) does not have the groove (5).

8. The viewing window according to any one of the preceding claims, characterized in that, The end seal (4) is integrally connected to the end face (3).

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

10. The viewing window according to any one of the preceding claims, characterized in that, The spacer frame (2) has a plurality of spacers (7, 8) distributed circumferentially around the spacer frame (2).

11. The observation 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 against each other.

12. The observation window according to claim 11, characterized in that, The spacers (7, 8) are designed as spacer plugs, wherein the first set of spacers (7) is designed as a convex spacer plug and the second set of spacers (8) is designed as a concave spacer plug.

13. The viewing window according to any one of the preceding claims, characterized in that, The two spacer frames (2) are designed to be identical in part, or are characterized by, The two spacer frames (2) are different in depth (a) of the outer frame (6).

14. The viewing window according to any one of the preceding claims, characterized in that, The glass carriers (10, 11) that support the observation window glass (9) are arranged on each spacer frame in the spacer frame (2).

15. The observation window according to claim 14, characterized in that, The two spacer frames (2) and the two window glass carriers (10, 11) are detachably fastened to the observation opening (101) by fastening device (12).

16. The observation window according to claim 15, characterized in that, The fastening device (12) is designed as a screw, wherein one of the window glass carriers (10) is designed to have a through hole (10.1) and the other window glass carrier (11) is designed to have a threaded dome (11.1) for receiving the fastening device (12).

17. The observation window according to claim 16, characterized in that, Some, preferably all, of the fastening devices (12) extend through the spacers (7, 8).

18. The observation window according to any one of claims 16 or 17, characterized in that, The window glass support (10) is provided with a cover (13) that covers the fastening device (12).

19. The viewing window according to any one of the preceding claims, characterized in that... It has a light source (14) for illuminating the observation area of ​​the observation window (1).

20. The observation window according to claim 19, characterized in that, The spacer frame (2) has a light source holder (15) for holding the light source (14).

21. The observation window according to claim 20, characterized in that, The light source holder (15) is arranged radially outside the end seal (4).

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