A display device

Abstract

The application provides a display device, which comprises a back plate, a light guide plate and a rubber frame, an opening is arranged on the side plate of the back plate, a protruding part and an elastic recessed part are arranged at positions corresponding to the opening of the light guide plate and the rubber frame respectively, and the protruding part and the elastic recessed part abut against each other. In the display device provided by the application, the assembling mode of the back plate, the light guide plate and the rubber frame is simple and convenient, other external structures do not need to be introduced, and the problems of assembly abnormality, low assembly yield and high cost can be reduced; when the light guide plate expands due to heat, the elastic recessed part can be further compressed by the protruding part of the light guide plate, so that the assembly stability is ensured, and the problems of internal structure loosening and display effect reduction caused by the expansion of the light guide plate are avoided.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically to a display device. Background Technology

[0002] As the most direct window for human-vehicle interaction, in-vehicle displays have broad market application prospects. However, due to the special nature of their operating environment, the quality requirements for in-vehicle displays are also more stringent. In addition to possessing basic display functions, in-vehicle displays also need to have advantages such as ease of operation, stable performance, and a high level of safety.

[0003] Currently, the most widely used technology in automotive displays is liquid crystal display (LCD) devices, which have matured in technology. LCD devices generally include a backlight module and an LCD panel located on the light-emitting side of the backlight module. The stability of the backlight module directly determines the overall stability of the LCD device. Due to the large temperature range in the application environment of automotive displays, the light guide plate in the backlight module often expands or contracts significantly under such large temperature changes. This causes the internal structure of the backlight module to loosen, further leading to problems such as noise, scratches from particles inside the backlight, decreased optical performance of the backlight module, and reduced display quality of the automotive display. Summary of the Invention

[0004] This invention provides a display device that can solve the problem of loosening of the internal structure of the display device caused by the expansion of the light guide plate, and effectively improve the stability and display effect of the display device.

[0005] This invention provides a display device, the display device comprising:

[0006] A back panel, the back panel including a bottom plate and a plurality of side plates, the bottom plate and the plurality of side plates forming a receiving cavity, and at least one of the side plates having an opening;

[0007] A light guide plate is housed within the receiving cavity, and the light guide plate has a protrusion facing the opening at a position corresponding to the opening;

[0008] A plastic frame is provided around the outside of the plurality of side plates. The plastic frame is provided with an elastic recess that is recessed toward the opening at the position corresponding to the opening, and the elastic recess abuts against the protrusion.

[0009] Optionally, the plurality of side plates include a first side plate, a second side plate, a third side plate, and a fourth side plate, wherein the first side plate and the third side plate are disposed opposite to each other, the second side plate and the fourth side plate are disposed opposite to each other, and a groove is formed on the side of the light guide plate facing the first side plate;

[0010] The display device further includes a backlight source, which is disposed on the first side plate and housed in the groove.

[0011] Optionally, at least one of the openings is provided on the third side plate.

[0012] Optionally, at least one of the openings is provided on the second side plate; and / or, at least one of the openings is provided on the fourth side plate.

[0013] Optionally, the opening on the second side plate is offset from the opening on the fourth side plate.

[0014] Optionally, a light-shielding element is provided on the side of the elastic recess away from the light guide plate.

[0015] Optionally, the elastic recess is in a compressed state.

[0016] Optionally, the end of the elastic recess adjacent to the base plate is provided with a chamfer.

[0017] Optionally, there is a gap between the light guide plate and the side plate, and a gap between the frame and the side plate.

[0018] Optionally, the lengths of the first side plate and the third side plate are greater than the lengths of the second side plate and the fourth side plate, the third side plate is provided with 2 to 5 elastic recesses, and the second side plate and / or the fourth side plate is provided with 2 elastic recesses.

[0019] The display device provided by this invention includes a back plate, a light guide plate, and a frame. An opening is provided on the side plate of the back plate. A protrusion and an elastic recess are respectively provided on the light guide plate and the frame corresponding to the opening. The protrusion and the elastic recess abut against each other. The assembly method of the protrusion and the elastic recess is simple and convenient, requiring no other external structures, thus reducing assembly abnormalities, improving assembly yield, and lowering costs. Furthermore, when the light guide plate expands due to heat, the elastic recess can be further compressed by the protrusion of the light guide plate, thereby ensuring assembly stability and avoiding problems such as loosening of the internal structure and reduced display effect caused by the expansion of the light guide plate. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1(a) shows a schematic diagram of the backlight module provided in an embodiment of the present invention;

[0022] FIG. 1(b) is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0023] Figure 2 shows a schematic cross-sectional view taken along line AA' in FIG. 1(a);

[0024] Figure 3 is a schematic structural diagram of a backplane provided by an embodiment of the present invention;

[0025] Figure 4 is a schematic structural diagram of a light guide plate provided by an embodiment of the present invention;

[0026] Figure 5 is a schematic structural diagram of a rubber frame provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not intended to limit the present application. In this application, unless otherwise stated, the directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" are in terms of the outline of the device.

[0028] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art can recognize the application of other processes and / or the use of other materials. Detailed descriptions are provided below respectively. It should be noted that the description order of the following embodiments does not serve as a limitation on the preferred order of the embodiments.

[0029] The present invention provides a display device, which is, for example, a liquid crystal display device. Specifically, FIG. 1(a) is a schematic structural diagram of a backlight module provided by an embodiment of the present invention; FIG. 1(b) is a schematic structural diagram of a display panel provided by an embodiment of the present invention, Figure 2A schematic cross-sectional view along line AA' in Figure 1(a) is shown; combining Figure 1(a), Figure 1(b) and Figure 2 As shown, the liquid crystal display device includes a backlight module 10 and a liquid crystal display panel 20, wherein the liquid crystal display panel 20 is disposed on the light-emitting side of the backlight module 10.

[0030] In this embodiment, the liquid crystal display panel 20 includes an array substrate 210, a color filter substrate 220, and a liquid crystal layer 230 located between the array substrate 210 and the color filter substrate 220. In terms of the liquid crystal driving method, the liquid crystal display panel 20 can be a twisted nematic (TN) type liquid crystal display panel, a vertical alignment (VA) type liquid crystal display panel, an in-plane switching (IPS) type liquid crystal display panel, a fringe field switching (FFS) type liquid crystal display panel, or other types of liquid crystal display panels. In terms of panel architecture design, the liquid crystal display panel 20 can be a conventional liquid crystal display panel where both the color filter and the black matrix are disposed on the color filter substrate 220, or a COA (Color Filter On Array) type liquid crystal display panel where the color filter is disposed on the array substrate 210, or a BOA (Black Matrix On Array) type liquid crystal display panel where the black matrix is ​​disposed on the array substrate 210.

[0031] In this embodiment, the backlight module 10 includes: a back plate 110, a light guide plate 140, a frame 150, a backlight 130, a reflective sheet 120, and an optical film group 160.

[0032] Specifically, the back panel 110 includes a base plate 111 and a plurality of side plates 112, the base plate 111 and the plurality of side plates 112 forming a receiving cavity. In an optional embodiment of this application, the back panel 110 is an integral sheet metal structure, that is, the base plate 111 and the plurality of side plates 112 of the back panel 110 are integrally formed; the light guide plate 140 is disposed on the base plate 111 and housed within the receiving cavity formed by the back panel 110; the frame 150 is disposed around the periphery of the back panel 110, specifically surrounding the plurality of side plates 112 away from the light guide plate. The backlight 130 is disposed on one side of the light guide plate 140 and corresponds to the light incident surface of the light guide plate 140. Preferably, the backlight 130 is located between the light guide plate 140 and the side plate 112, that is, the backlight module 10 is a side-lit backlight module. The reflective sheet 120 is disposed between the back plate 110 and the light guide plate 140. The optical film group 160 is disposed above the light guide plate 140 and corresponds to the light emitting surface of the light guide plate 140. The optical film group 160 includes, for example, a diffuser, a brightness enhancement film, and a prism sheet.

[0033] In this embodiment, at least one of the side plates 112 is provided with an opening 113, the light guide plate 140 is provided with a protrusion 141 facing the opening 113 at a position corresponding to the opening 113, and the frame 150 is provided with an elastic recess 151 recessed towards the opening 113 at a position corresponding to the opening 113, and the elastic recess 151 abuts against the protrusion 141. The elastic recess 151 is elastic and can be further compressed after the light guide plate 140 is heated and expanded.

[0034] In the prior art, the light guide plate will expand due to the heat generated by the backlight or the ambient temperature, which will cause the internal structure of the display device to loosen, resulting in abnormal noise during use and particle scratches inside the backlight module. In order to provide space for the thermal expansion of the light guide plate, the conventional method of fixing the light guide plate is to set rubber blocks between the four corners of the light guide plate and the side plate. However, the rubber blocks are prone to misalignment during assembly, causing the light guide plate and optical film to be pushed up. As a result, the light guide plate does not have the expansion space required by design, causing the optical film in the optical film assembly to wrinkle and affecting the display effect.

[0035] Figure 3 A schematic diagram of the structure of the back plate provided in an embodiment of the present invention is shown; Figure 4 A schematic diagram of the structure of the light guide plate provided in an embodiment of the present invention is shown; Figure 5 A schematic diagram of the structure of the adhesive frame provided in an embodiment of the present invention is shown. (Combined with...) Figure 1(a)-Figure 5As shown, the display device provided by the present invention includes a back plate 110, a light guide plate 140, and a frame 150. An opening 113 is provided on the side plate 112 of the back plate 110. The light guide plate 140 and the frame 150 are respectively provided with a protrusion 141 and an elastic recess 151 at the positions corresponding to the opening 113. The protrusion 141 and the elastic recess 151 abut against each other. The assembly method of the protrusion 141 and the elastic recess 151 is simple and convenient, without the need to introduce other external structures, which can reduce assembly abnormalities, improve assembly yield, and reduce costs. Furthermore, when the light guide plate 140 expands due to heat, the elastic recess 151 can be further compressed by the protrusion 141 of the light guide plate 140, thereby ensuring assembly stability and avoiding the problems of loosening of the internal structure of the backlight module 10 and reduced display effect of the display device caused by the expansion of the light guide plate 140.

[0036] In this embodiment, the plurality of side plates 112 include a first side plate 1121, a second side plate 1122, a third side plate 1123 and a fourth side plate 1124. The first side plate 1121 and the third side plate 1123 are arranged opposite to each other, and the second side plate 1122 and the fourth side plate 1124 are arranged opposite to each other.

[0037] In this embodiment, the first side plate 1121, the second side plate 1122, the third side plate 1123, and the fourth side plate 1124 form a rectangle. The length of the first side plate 1121 is equal to the length of the third side plate 1123, the length of the second side plate 1122 is equal to the length of the fourth side plate 1124, and the lengths of the first side plate 1121 and the third side plate 1123 are greater than the lengths of the second side plate 1122 and the fourth side plate 1124.

[0038] In this embodiment, the light guide plate 140 has a groove 143 formed on the side facing the first side plate 1121. Specifically, the light guide plate 140 includes support bodies 142 disposed on both sides of the groove 143. The backlight 130 is disposed on the first side plate 1121 and housed in the groove 143. The depth of the groove 143 is greater than the thickness of the backlight 130. Preferably, the first side plate 1121 does not have an opening 113. Since the light guide plate 140 already has a groove 143 for housing the backlight 130 on the side near the side plate 1121, when no opening is provided on the first side plate 1121, there is no need to provide a protrusion on the side of the light guide plate 140 near the first side plate 1121, thereby ensuring the support strength of the light guide plate 140 and simplifying the manufacturing process.

[0039] In this embodiment, the third side plate 1123 is provided with at least one opening 113, and the light guide plate 140 and the frame 150 on both sides of the third side plate 1123 are respectively provided with protrusions 141 and elastic recesses 151 corresponding one-to-one with the openings 113 on the third side plate 1123. Preferably, the third side plate 1123 is provided with 2 to 5 openings 113, and the number of openings 113 can be adaptively set according to the size of the backlight module 10 in the display panel 20. Specifically, when the size of the backlight module 10 (i.e., the length of the diagonal of the backlight module 10) is between 17 and 27 inches, the third side plate 1123 is provided with 2 to 3 openings 113, and correspondingly, the light guide plate 140 is provided with 2 to 3 protrusions 141 on the side near the third side plate 1123, and the frame 150 is provided with 2 to 3 elastic recesses 151 on the side near the third side plate 1123; when the size of the backlight module 10 is greater than 27 inches but less than or equal to 48 inches, the third side plate 1123 is provided with 3 to 5 openings 113, and correspondingly, the light guide plate 140 is provided with 3 to 5 protrusions 141 on the side near the third side plate 1123, and the frame 150 is provided with 3 to 5 elastic recesses 151 on the side near the third side plate 1123. Of course, the size of the backlight module 10 can be less than 17 inches or greater than or equal to 48 inches. In this case, the third side plate 1123 can have only one opening 113 or more than five openings 113. Correspondingly, the light guide plate 140 has one or more protrusions 141 on the side near the third side plate 1123, and the frame 150 has one or more elastic recesses 151 on the side near the third side plate 1123.

[0040] In this embodiment, the opening 113 is clearance-fitted with the protrusion 141, and the opening 113 is clearance-fitted with the elastic recess 151. Preferably, the opening 113 is rectangular in shape, the elastic recess 151 includes two spaced and symmetrically arranged side portions 1511 and a bottom portion 1512 connecting the two side portions 1511, the side portions 1511 and the bottom portion 1512 form an obtuse angle, the bottom portion 1512 abuts against the protrusion 141, and the length of the opening 113 is greater than the maximum spacing distance between the two side portions 1511 of the elastic recess 151. When the size of the backlight module 10 is between 17 and 27 inches, the length of the opening 113 is 7 to 10 mm, the maximum spacing between the two sides 1511 of the elastic recess 151 is 5 to 8 mm, and the depth of the elastic recess 151 is 0.5 to 1 mm; when the size of the backlight module 10 is greater than 27 inches but less than or equal to 48 inches, the length of the opening 113 is 10 to 12 mm, the maximum spacing between the two sides 1511 of the elastic recess 151 is 8 to 10 mm, and the depth of the elastic recess 151 is 0.5 to 1 mm.

[0041] Of course, in other embodiments, the opening 113 can also be a circle or other shapes, the concave contour of the elastic recess 151 can be a straight line or an arc; the protruding contour of the protrusion 141 can be a straight line or an arc.

[0042] like Figure 2 As shown, in this embodiment, the fourth side plate 1124 is provided with at least one opening 113, while the second side plate 1122 is not provided with an opening 113. Since the adjacent third side plate 1123 and fourth side plate 1124 are each provided with at least one opening 113, the light guide plate 140 is provided with a protrusion 141 corresponding to each opening 113, and the frame 150 is provided with an elastic recess 151 corresponding to each opening 113. This allows the light guide plate 140 to provide expansion space for both longitudinal and lateral expansion by compressing the elastic recess 151 through the protrusions 141 partially located within the openings 113 of the third side plate 1123 and the fourth side plate 1124. Preferably, the fourth side plate 1124 is provided with two openings 113, while the second side plate 1122 is not provided with an opening 113.

[0043] In another embodiment of this invention, the second side plate 1122 is provided with at least one opening 113, while the fourth side plate 1124 is not provided with an opening 113 (not shown in the figure). Since the adjacent third side plate 1123 and the second side plate 1122 are each provided with at least one opening 113, the light guide plate 140 is provided with a protrusion 141 corresponding to each opening 113, and the frame 150 is provided with an elastic recess 151 corresponding to each opening 113. This allows the light guide plate 140 to provide expansion space for both longitudinal and lateral expansion by compressing the elastic recess 151 through the protrusions 141 partially located within the openings 113 of the third side plate 1123 and the second side plate 1122. Preferably, the second side plate 1122 is provided with two openings 113, while the fourth side plate 1124 is not provided with an opening 113.

[0044] In another embodiment of this example, at least one opening 113 is provided on the fourth side plate 1124, and at least one opening 113 (not shown in the figure) is provided on the second side plate 1122. Since the second side plate 1122 and the fourth side plate 1124 adjacent to the third side plate 1123 are respectively provided with at least one opening 113, the light guide plate 140 is provided with a protrusion 141 corresponding to each of the openings 113, and the frame 150 is provided with an elastic recess 151 corresponding to each of the openings 113. This allows the light guide plate 140 to provide expansion space for lateral expansion when it expands laterally. This is because the protrusion 141 located in the opening 113 of the second side plate 1122 can compress the elastic recess 151 to provide expansion space for lateral expansion, and the protrusion 141 located in the opening 113 of the fourth side plate 1124 can compress the elastic recess 151 to provide expansion space for lateral expansion. This results in a larger lateral expansion space for the light guide plate 140 and improves the high temperature resistance of the display device. Preferably, two openings 113 are respectively provided on the second side plate 1122 and the fourth side plate 1124. Further, the openings 113 on the second side plate 1122 and the fourth side plate 1124 are staggered, thereby improving assembly stability and making the protrusions 141 of the expanded light guide plate 140 more uniform when compressing the elastic recesses 151. Preferably, the number of openings 113 on the second side plate 1122 is different from the number of openings 113 on the fourth side plate 1124. For example, the fourth side plate 1124 has two openings 113 on the second side plate 1122, and the second side plate 1124 has two openings 113 on the second side plate 1124. The second side plate 1122 has one opening 113, and the orthographic projection of the opening 113 on the fourth side plate 1124 is located between the two openings 113 on the fourth side plate 1124; or, the second side plate 1122 has two openings 113, and the fourth side plate 1124 has one opening 113, and the orthographic projection of the opening 113 on the fourth side plate 1124 on the second side plate 1122 is located between the two openings 113 on the second side plate 1122.

[0045] In this embodiment, a light-shielding member (not shown in the figure) is provided on the side of the elastic recess 151 away from the light guide plate 140. The light-shielding member is used to prevent light from the light guide plate 140 from being emitted from the frame 150 through the opening 113 on the side plate 112, thereby avoiding light leakage. Specifically, the light-shielding member can be light-shielding tape or a light-shielding plate, etc.

[0046] In this embodiment, the elastic recess 151 is in a compressed state, that is, after the backlight module 10 in the display device is assembled, the elastic recess 151 has been compressed by the protrusion 141, thereby making the assembly of the elastic recess 151 and the protrusion 141 more stable and firm, improving the stability of the backlight module 10 and the display device under normal use; and since the elastic recess 151 has a certain amount of compression in the initial assembly state, even if the light guide plate 140 shrinks due to the external environment, the elastic recess 151 can rebound, so that the protrusion 141 of the light guide plate 140 and the elastic recess 151 still maintain a stable contact state, thereby ensuring the assembly effect of the backlight module 10 and the display quality of the display device.

[0047] In this embodiment, the light guide plate 140 and the protrusion 141 are integrally formed, and the frame 150 and the elastic recess 151 are integrally formed, so as to simplify the manufacturing process and reduce material costs.

[0048] In this embodiment, the end of the elastic recess 151 adjacent to the base plate 111 is provided with a chamfer 152. Since the frame 150 is fitted onto the outside of the side plate 112 from top to bottom, the chamfer 152 makes it easier and more convenient to assemble the frame 150 with the light guide plate 140 and the side plate 112, thus improving the assembly yield. The chamfer 152 can be a rounded chamfer or an angular chamfer.

[0049] In this embodiment, the positions of the back plate 110 and the frame 150 in the display device are fixed. Preferably, there is a gap between the light guide plate 140 and the side plate 112. Since the expansion of the light guide plate 140 when heated is integral, by providing a gap between the light guide plate 140 and the side plate 112, expansion space can be provided for the other parts of the light guide plate 140 except for the protrusion 141, thereby improving the stability of the backlight module 10 and the display device under high-temperature conditions. Furthermore, the gap between the frame 150 and the side plate 112 can increase the maximum compression of the elastic recess 151 of the frame 150, further improving the stability of the backlight module 10 and the display device under high-temperature conditions, reducing assembly difficulty, and improving assembly yield.

[0050] In summary, the present invention provides a display device comprising: a back plate, the back plate including a bottom plate and a plurality of side plates, the bottom plate and the plurality of side plates forming a receiving cavity, at least one of the side plates having an opening; a light guide plate housed within the receiving cavity, the light guide plate having a protrusion facing the opening at a position corresponding to the opening; and a frame surrounding the outside of the plurality of side plates, the frame having an elastic recess facing the opening at a position corresponding to the opening, and the elastic recess abutting against the protrusion. In the display device provided by the present invention, the assembly of the back plate, light guide plate, and frame is simple and convenient, requiring no additional external structures, reducing assembly anomalies, improving assembly yield, and lowering costs; furthermore, when the light guide plate expands due to heat, the elastic recess can be further compressed by the protrusion of the light guide plate, thereby ensuring assembly stability and avoiding problems such as loosening of the internal structure and reduced display effect caused by the expansion of the light guide plate.

[0051] The above provides a detailed description of a display device provided by an embodiment of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A display device, characterized in that, The display device includes: A back panel, comprising a bottom plate and a plurality of side plates, the bottom plate and the plurality of side plates forming a receiving cavity, the plurality of side plates including a first side plate, a second side plate, a third side plate and a fourth side plate, the first side plate and the third side plate being disposed opposite to each other, the second side plate and the fourth side plate being disposed opposite to each other, at least two of the second side plate, the third side plate and the fourth side plate being provided with openings, the second side plate being provided with at least one opening, and the fourth side plate being provided with at least one opening, the opening on the second side plate and the opening on the fourth side plate being misaligned; A light guide plate is housed within the receiving cavity, and the light guide plate has a protrusion facing the opening at a position corresponding to the opening; A plastic frame is provided around the outside of the plurality of side plates. The plastic frame is provided with an elastic recess that is recessed toward the opening at the position corresponding to the opening, and the elastic recess abuts against the protrusion. The opening is in clearance fit with the protrusion and the opening is in clearance fit with the elastic recess. The elastic recess includes a side and a bottom, and the bottom abuts against the protrusion.

2. The display device according to claim 1, characterized in that, A light-shielding element is provided on the side of the elastic recess away from the light guide plate.

3. The display device according to claim 1, characterized in that, The elastic recess is in a compressed state.

4. The display device according to claim 1, characterized in that, The end of the elastic recess adjacent to the base plate is chamfered.

5. The display device according to claim 1, characterized in that, The side portion forms an obtuse angle with the bottom portion, and the length of the opening is greater than the maximum interval between the two sides of the elastic recess.

6. The display device according to claim 1, characterized in that, There is a gap between the light guide plate and the side plate, and there is a gap between the frame and the side plate.

7. The display device according to any one of claims 1 to 6, characterized in that, The light guide plate has a groove on the side facing the first side plate; wherein, the display device further includes a backlight, the backlight is disposed on the first side plate and housed in the groove, the first side plate does not have the opening, and the third side plate has at least one opening.

8. The display device according to claim 7, characterized in that, The lengths of the first side plate and the third side plate are greater than the lengths of the second side plate and the fourth side plate. The third side plate is provided with 2 to 5 elastic recesses, and the second side plate and / or the fourth side plate is provided with 2 elastic recesses.

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