Filter testing device

Abstract

The invention is suitable for the technical field of detection equipment, and provides a filter testing device which comprises a shielding main body, a product positioning seat, a high-frequency testing plate and a connecting assembly. The high-frequency test board is connected with an external test circuit or a test device, a product can be placed in the positioning groove when the product is tested, at the moment, the detection end of the product is connected with the high-frequency test board through the connecting assembly, and meanwhile grounding connection of the product is achieved through the grounding part. Compared with a testing device in the prior art, the product can be connected with a testing circuit or testing equipment by placing the product in the positioning groove in the product positioning seat, so that the product can be tested more quickly and conveniently, and the structure is small, exquisite and simple. And meanwhile, the product positioning seat, the high-frequency test board and the product in the test process are all arranged in the shielding groove, so that external electromagnetic radiation can be shielded, the influence of the external electromagnetic radiation on a test result is avoided, and the test result is more accurate.

Description

Technical Field

[0001] The invention belongs to the technical field of testing equipment, and in particular relates to a filter testing device. Background Art

[0002] With the development of integrated electronic circuits, people have higher and higher requirements for electromagnetic compatibility, and the suppression range of ultra-small power EMI (Electromagnetic Interference Filter) filters as power ports has also increased from kilohertz (KHz) to above GHz, so the insertion loss value has become an important indicator for evaluating the suppression performance of power EMI filters. However, most of the current tests on the insertion loss value of filters have the problems of cumbersome operation and low efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide a filter testing device, aiming to solve the technical problems of complicated loss testing operation and low efficiency existing in the filter testing device in the prior art.

[0004] The present invention is implemented as follows: a filter testing device, the filter testing device comprising a shielding body, a product positioning seat, a high-frequency test board and a connecting component, the shielding body having a shielding groove, the high-frequency test board being arranged in the shielding groove, the product positioning seat being installed on the high-frequency test board and being located in the shielding groove, the product positioning seat having a positioning groove for accommodating the product, the connecting component being used to connect the detection end of the product with the high-frequency test board after the product is placed in the positioning groove, and a grounding portion being provided on the side wall and / or bottom surface of the positioning groove, the grounding portion being used to abut against the grounding end of the product after the product is placed in the positioning groove to achieve a grounding connection of the product.

[0005] In an optional embodiment, the connecting component includes an elastic guide pin, and an avoidance structure is provided on the product positioning seat. The first end of the elastic guide pin is connected to the high-frequency test board, and the second end of the elastic guide pin extends into the positioning groove through the avoidance structure, and is used to abut against the detection end of the product after the product is placed in the positioning groove.

[0006] In an optional embodiment, the elastic guide needle is covered with an insulating sleeve on the outside, and the insulating sleeve is used to prevent the elastic guide needle from contacting the product positioning seat.

[0007] In an optional embodiment, the product positioning seat includes a bottom plate portion and a cover plate portion, the bottom plate portion is arranged above the high-frequency test board, the cover plate portion is covered above the bottom plate portion, the cover plate portion has an avoidance hole matching the shape of the product, and the side wall of the avoidance hole and at least part of the bottom surface of the bottom plate portion are arranged to form the positioning groove.

[0008] In an optional embodiment, the product positioning seat also includes a plurality of elastic push pins, and the plurality of elastic push pins are all located between the bottom plate portion and the cover plate portion. The bottom plate portion and the cover plate portion are both provided with mounting grooves for accommodating and fixing the elastic push pins, and the movable ends of the elastic push pins extend into the positioning grooves to form the grounding portion.

[0009] In an optional embodiment, a grounding conductive gasket is further provided on the bottom surface of the positioning groove, and the grounding conductive gasket is used to abut against the bottom surface of the product after the product is placed in the positioning groove to increase the grounding area of ​​the product.

[0010] In an optional embodiment, detection connectors are provided on both sides of the shielding body, and the detection connectors are used to connect the high-frequency test board to an external circuit.

[0011] In an optional embodiment, the filter testing device also includes a pressing bracket, a pressing piece and a driving structure, wherein the pressing piece is movably arranged on the pressing bracket and is located above the positioning groove, the driving structure is arranged on the pressing bracket and a driving end is connected to the pressing piece, and the driving structure is used to drive the pressing piece away from or close to the product.

[0012] In an optional embodiment, a buffer portion is provided at the working end of the pressing member, and the buffer portion is used to prevent the pressing member from causing damage to the product.

[0013] In an optional embodiment, the driving structure includes a hinge and a rotating handle, one end of the rotating handle is rotatably connected to the pressing bracket, one end of the hinge is hinged to the rotating handle, and the other end of the hinge is hinged to the pressing member.

[0014] The technical effect of the present invention relative to the prior art is: a shielding groove is provided on the shielding body, a high-frequency test board is provided at the bottom of the shielding groove, a product positioning seat is provided on the high-frequency test board, and a positioning groove for accommodating and positioning the product is provided on the product positioning seat. At the same time, a grounding part is provided on the side wall and / or the bottom surface of the positioning groove, and when the product is placed inside the positioning groove, the test end of the product can be connected to the high-frequency test board through a connecting component, and the grounding connection of the product can be achieved by abutting the grounding end of the product through the grounding part. By connecting the high-frequency test board to an external test circuit or a test device, the product can be placed in the positioning groove when testing the product, and at this time, the detection end of the product is connected to the high-frequency test board through a connecting component, and the grounding connection of the product is achieved through the grounding part. Compared with the test device in the technology, the connection between the product and the test circuit or test equipment can be achieved by placing the product in the positioning groove on the product positioning seat, making the product test faster and more convenient, and the structure is compact and simple. At the same time, the product positioning seat, the high-frequency test board, and the product testing process are all arranged in the shielding groove, which can shield external electromagnetic radiation, avoid the influence of external electromagnetic radiation on the test results, and make the test results more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 is a schematic structural diagram of a filter testing device provided by an embodiment of the present invention;

[0017] Figure 2 is a partial cross-sectional structural schematic diagram of a filter testing device provided by an embodiment of the present invention;

[0018] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0019] Figure 4 is a schematic diagram of the structure of a product positioning seat used in an embodiment of the present invention;

[0020] Figure 5 is a schematic diagram of a detection circuit used in an embodiment of the present invention.

[0021] Description of reference numerals:

[0022] 100, filter test tooling; 200, receiver; 300, test line; 400, signal generator; 500, product;

[0023] 1. Shielding body; 11. Shielding groove; 2. Product positioning seat; 21. Bottom plate; 22. Cover plate; 23. Elastic ejector pin; 24. Positioning groove; 25. Grounding part; 3. High-frequency test board; 4. Connecting assembly; 41. Elastic guide pin; 42. Insulating sleeve; 5. Grounding conductive gasket; 6. Detection connector; 7. Pressing bracket; 8. Driving structure; 81. Hinge; 82. Turning handle 9. Pressing part; 10. Buffer part. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] Please refer to Figures 1 to 4As shown, in an embodiment of the present invention, there is provided a filter testing device, which includes a shielding body, a product positioning seat, a high-frequency test board and a connecting component. The shielding body has a shielding groove, the high-frequency test board is arranged in the shielding groove and is located on the bottom surface of the shielding groove, the product positioning seat is installed on the high-frequency test board and is located in the shielding groove, the product positioning seat has a positioning groove for accommodating the product, the connecting component is used to connect the detection end of the product with the high-frequency test board after the product is placed in the positioning groove, and a grounding portion is provided on the side wall and / or bottom surface of the positioning groove, and the grounding portion is used to abut against the grounding end of the product after the product is placed in the positioning groove to achieve a grounding connection of the product.

[0030] Specifically, the shielding body refers to a component that can be used for electromagnetic signals. The shielding body is usually in a block shape. The shielding groove refers to a groove structure with a certain structure provided on the shielding body. The shielding groove is generally recessed on the top surface of the shielding body. In order to improve the shielding effect of the shielding body, the shielding body can be made of metal materials such as metal aluminum, and the shielding groove can be made on the shielding body by machining and other methods. At the same time, a gold-plated layer can be provided on the surface of the shielding body and the inner wall of the shielding groove to improve the oxidation resistance and shielding effect of the shielding body. The product positioning seat refers to a component with a certain height. The product positioning seat can be in a block shape, a plate shape or a combination of multiple shapes. After the product positioning seat is installed, the top surface of the product positioning seat is generally lower than or at the mouth of the shielding groove. The positioning groove refers to a groove component with a certain depth provided on the product positioning seat, and the shape of the positioning groove matches the product.

[0031] A high-frequency test board refers to a circuit board specifically used for high-frequency signal testing. It is mainly used to test the performance of high-frequency electronic components, circuit modules, and high-frequency communication systems in a high-frequency environment. The high-frequency range generally refers to a frequency band ranging from hundreds of MHz to tens of GHz or even higher. The high-frequency test board can be made of a gold-plated layer on the surface of a high-frequency ceramic board, which can improve the anti-interference ability of the test device at high frequencies and reduce the overall internal resistance of the test device. A connecting component refers to a component that can electrically connect two components. The connecting component can be a columnar, rod-shaped, or strip-shaped component, or a flexible connecting wire. Among them, the connecting component can be made of a conductive material such as metal. The connecting component can be set on a product positioning seat, and the product positioning seat can also be set independently of the product positioning seat. A grounding part refers to a component with a certain volume. The grounding part can be a block, plate, or hemispherical shape, etc. The grounding part itself is generally a conductor, such as metal or graphite, and at least part of the grounding part needs to be grounded.

[0032] The filter testing device provided by the embodiment of the present invention is provided with a shielding groove on the shielding body, a high-frequency test board is provided at the bottom of the shielding groove, a product positioning seat is provided on the high-frequency test board, and a positioning groove for accommodating and positioning the product is provided on the product positioning seat. At the same time, a grounding portion is provided on the side wall and / or the bottom surface of the positioning groove, and when the product is placed inside the positioning groove, the test end of the product can be connected to the high-frequency test board through a connecting component, and the grounding connection of the product can be achieved by abutting the grounding end of the product through the grounding portion. By connecting the high-frequency test board to an external test circuit or a test device, the product can be placed in the positioning groove when testing the product, and the detection end of the product can be connected to the high-frequency test board through a connecting component, and the grounding connection of the product can be achieved through the grounding portion. Compared with the test device in the technology, the connection between the product and the test circuit or test equipment can be achieved by placing the product in the positioning groove on the product positioning seat, so that the product test is faster and more convenient, and the structure is compact and simple. At the same time, the product positioning seat, the high-frequency test board, and the product testing process are all arranged in the shielding groove, which can shield external electromagnetic radiation, avoid the influence of external electromagnetic radiation on the test results, and make the test results more accurate.

[0033] In one embodiment, see Figure 2 and Figure 3 , the connection assembly includes an elastic guide pin, a product positioning seat is provided with an avoidance structure, the first end of the elastic guide pin is connected to the high-frequency test board, the second end of the elastic guide pin extends into the positioning groove through the avoidance structure, and is used to abut the detection end of the product after the product is placed in the positioning groove. Specifically, the elastic guide pin refers to a columnar component with a retractable property. The elastic guide pin may include a needle rod, a needle head and an elastic member. By making the needle head coaxial with the needle rod and movably connected, and providing an elastic member between the needle rod and the needle head, the needle head part of the elastic guide pin can have a retractable property. By connecting one end (needle rod part) of the elastic guide pin to the high-frequency test board, the second end (needle head part) of the elastic guide pin extends into the positioning groove through the avoidance structure, and the position of the second end of the elastic guide pin matches the position of the detection end after the product is placed in the positioning groove. After the product is placed in the positioning groove, the second end of the elastic guide pin can abut on the detection end of the product, so as to achieve the purpose of quickly connecting the detection end of the product with the high-frequency test board, making the product detection step simpler and more convenient. At the same time, since the elastic guide needle itself is elastic, the elastic guide needle can always be kept in close contact with the detection end of the product, which also ensures good and effective contact between the second end of the elastic guide needle and the detection end of the product, reducing test losses.

[0034] In addition, by providing an avoidance structure such as an avoidance hole or an avoidance groove on the product positioning seat, the second end of the elastic guide needle can extend into the positioning groove through the avoidance structure, and the product positioning seat is generally also a metal component. When the second end of the elastic guide needle passes through the avoidance structure, the product positioning seat can also shield external electromagnetic radiation to prevent external electromagnetic radiation from affecting the test results.

[0035] In one embodiment, see Figure 3 The outer part of the elastic guide pin is covered with an insulating sleeve, which is used to prevent the elastic guide pin from contacting the product positioning seat. Specifically, the insulating sleeve refers to a columnar component with a certain height, and a receiving hole for accommodating the elastic guide pin is also provided in the insulating sleeve. The insulating sleeve can generally be made of insulating materials such as rubber, ceramic or plastic. By covering the outer part of the elastic guide pin with the insulating sleeve, the elastic guide pin can be prevented from contacting the product positioning seat when the elastic guide pin passes through the avoidance structure.

[0036] In an alternative embodiment, see Figure 3 The avoidance structure is located in the avoidance hole, and the insulating sleeve is installed in the avoidance hole and the outer diameter of the insulating sleeve matches the outer diameter of the avoidance hole. At this time, the insulating sleeve can support and limit the elastic guide pin to prevent the elastic guide pin from being bent due to excessive force during work.

[0037] In one embodiment, see Figure 2 and Figure 4 The product positioning seat includes a bottom plate portion and a cover plate portion. The bottom plate portion is arranged above the high-frequency test board, and the cover plate portion is arranged to cover the top of the bottom plate portion. The cover plate portion has an avoidance hole that matches the shape of the product, and the side wall of the avoidance hole and at least part of the bottom surface of the bottom plate portion are arranged to form a positioning groove. Specifically, the bottom plate portion and the cover plate portion both refer to components with a certain volume, and both the bottom plate portion and the cover plate portion can be block-shaped or plate-shaped. And by arranging the bottom plate portion above the high-frequency test board, the cover plate portion is arranged to cover the top of the bottom plate portion to form a product positioning seat, and at the same time, the cover plate portion has an avoidance hole that matches the shape of the product, and the side wall of the avoidance hole and at least part of the bottom surface of the bottom plate portion are arranged to form a positioning groove, the overall structure of the product positioning seat can be simpler, and the assembly of the product positioning seat can also be made more convenient.

[0038] Based on the above-mentioned characteristic bottom plate and cover plate, please refer to Figure 4The product positioning seat also includes a plurality of elastic ejector pins, which are all located between the bottom plate portion and the cover plate portion. The bottom plate portion and the cover plate portion are both provided with mounting grooves for accommodating and fixing the elastic ejector pins. The movable end of the elastic ejector pin extends into the positioning groove to form a grounding portion. Specifically, the elastic ejector pin refers to a columnar component with a certain elasticity. The elastic ejector pin is usually composed of a pin body and an elastic element, so that the end area of ​​the elastic ejector pin can be movable under the action of the elastic member, thereby forming the movable end of the elastic ejector pin. By clamping the elastic ejector pin between the bottom plate portion and the cover plate portion, and providing mounting grooves for accommodating and fixing the elastic ejector pin on the bottom plate portion and the cover plate portion, the installation and fixation of the elastic ejector pin can be made more secure. In addition, the movable end of the elastic ejector pin extends into the positioning groove to form a grounding portion, and because the elastic ejector pin itself has a certain elasticity, the elastic action of the elastic ejector pin can keep the grounding portion in good contact with the product at all times.

[0039] In one embodiment, see Figure 4 , a grounding conductive gasket is also provided on the bottom surface of the positioning groove, and the grounding conductive gasket is used to abut against the bottom surface of the product after the product is placed in the positioning groove to increase the grounding area of ​​the product. Specifically, a grounding conductive gasket refers to a component used in electrical equipment and systems, and its main function is to provide a good electrical connection and ensure the grounding of the equipment. It can reliably connect the metal casing of the equipment or other components that need to be grounded to the earth or the grounding system. By providing a grounding conductive gasket on the bottom surface of the positioning groove, the grounding conductive gasket can abut against the bottom surface of the product after the product is placed in the positioning groove to increase the grounding area of ​​the product and make the grounding effect of the product better.

[0040] In one embodiment, see Figure 1 and Figure 2 , detection connectors are provided on both sides of the shielding body, and the detection connectors are used to connect the high-frequency test board to the external circuit. Specifically, the detection connector refers to a component that can cooperate with other plug-in structures to achieve electrical connection. A connecting through hole can be provided on the shielding body, and the detection connector is installed on the side of the shielding body, and then the connection between the detection connector and the high-frequency test board is achieved by passing the wire through the connecting through hole, and finally the high-frequency test board is connected to the external circuit through the detection connector. A detection connector is provided on the outside of the shielding body, which makes it more convenient to connect the high-frequency test board to the external circuit.

[0041] In one embodiment, see Figure 1The filter testing device also includes a pressing bracket, a pressing piece and a driving structure. The pressing piece is movably arranged on the pressing bracket and is located above the positioning groove. The driving structure is arranged on the pressing bracket and the driving end is connected to the pressing piece, which is used to drive the pressing piece away from or close to the product. Specifically, the pressing bracket refers to a supporting component with a certain height. The pressing bracket can be a block, a plate or a combination of various shapes. The pressing piece refers to a component with a certain volume. The pressing piece can be a column, a block or a combination of various shapes. The driving structure refers to a component or assembly used to drive the movement of an object. The driving structure can be a cylinder, a hydraulic cylinder or an electric push rod, etc. The driving structure can also be driven manually. By movably arranging the pressing piece on the pressing bracket, and the pressing piece is located above the positioning groove, and at the same time a driving structure is provided on the pressing bracket and the driving end is connected to the pressing piece, after the product is placed inside the positioning groove, the pressing piece can be driven by the driving structure to approach the product and press against the product, so that the installation of the product in the positioning groove is more secure, and at the same time, the contact between the product and the connecting component and the grounding part can be better, thereby reducing the internal resistance after the product is connected and reducing the internal loss.

[0042] In one embodiment, see Figure 1 A buffer portion is provided at the working end of the pressing piece, and the buffer portion is used to prevent the pressing piece from causing damage to the product. Specifically, the buffer portion refers to an elastic component with a certain volume, and the buffer portion can be block-shaped, columnar, or a combination of multiple shapes. The material of the buffer portion can be rubber, polyurethane, or plastic, etc. By providing the buffer portion at the working end of the pressing piece, it can provide a buffer when the pressing piece presses the product to prevent the pressing piece from crushing the product, thereby improving the safety of product testing.

[0043] In one embodiment, see Figure 1 The driving structure includes an articulated part and a rotating handle. One end of the rotating handle is rotatably connected to the pressing bracket, one end of the articulated part is hinged to the rotating handle, and the other end of the articulated part is hinged to the pressing part. Specifically, the articulated part refers to a component with a certain volume, and the rotating handle refers to a rod-shaped component with a certain length. By hinge-connecting one end of the articulated part to the rotating handle and the other end of the articulated part to the pressing part, when it is necessary to drive the pressing part to move, the pressing part can be pushed to move by driving the rotating handle and through the lever action of the articulated part, making it more convenient and labor-saving to drive the pressing part to move.

[0044] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for explaining the principles of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementations of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A filter testing device, characterized in that: It includes a shielding body, a product positioning seat, a high-frequency test board and a connecting component, the shielding body has a shielding groove, the high-frequency test board is arranged in the shielding groove, the product positioning seat is installed on the high-frequency test board and is located in the shielding groove, the product positioning seat has a positioning groove for accommodating the product, the connecting component is used to connect the detection end of the product with the high-frequency test board after the product is placed in the positioning groove, and a grounding part is provided on the side wall and / or bottom surface of the positioning groove, the grounding part is used to abut against the grounding end of the product after the product is placed in the positioning groove to realize the grounding connection of the product.

2. The filter testing device according to claim 1, characterized in that: The connecting component includes an elastic guide pin, and an avoidance structure is provided on the product positioning seat. The first end of the elastic guide pin is connected to the high-frequency test board, and the second end of the elastic guide pin extends into the positioning groove through the avoidance structure, and is used to abut against the detection end of the product after the product is placed in the positioning groove.

3. The filter testing device according to claim 2, characterized in that: The elastic guide needle is covered with an insulating sleeve on the outside, and the insulating sleeve is used to prevent the elastic guide needle from contacting the product positioning seat.

4. The filter testing device according to claim 2, characterized in that: The product positioning seat includes a bottom plate portion and a cover plate portion, the bottom plate portion is arranged above the high-frequency test board, the cover plate portion is covered above the bottom plate portion, the cover plate portion has an avoidance hole matching the shape of the product, and the side wall of the avoidance hole and at least part of the bottom surface of the bottom plate portion are arranged to form the positioning groove.

5. The filter testing device according to claim 4, characterized in that: The product positioning seat also includes a plurality of elastic ejector pins, and the plurality of elastic ejector pins are all located between the bottom plate portion and the cover plate portion. The bottom plate portion and the cover plate portion are both provided with mounting grooves for accommodating and fixing the elastic ejector pins. The movable ends of the elastic ejector pins extend into the positioning grooves to form the grounding portion.

6. The filter testing device according to claim 5, characterized in that: A grounding conductive gasket is also provided on the bottom surface of the positioning groove, and the grounding conductive gasket is used to abut against the bottom surface of the product after the product is placed in the positioning groove, so as to increase the grounding area of ​​the product.

7. The filter testing device according to claim 1, characterized in that: Detection connectors are provided on both sides of the shielding body, and the detection connectors are used to connect the high-frequency test board with an external circuit.

8. The filter testing device according to any one of claims 1 to 6, characterized in that: The filter testing device also includes a pressing bracket, a pressing piece and a driving structure. The pressing piece is movably arranged on the pressing bracket and is located above the positioning groove. The driving structure is arranged on the pressing bracket and the driving end is connected to the pressing piece for driving the pressing piece away from or close to the product.

9. The filter testing device according to claim 8, characterized in that: A buffer portion is provided at the working end of the pressing member, and the buffer portion is used to prevent the pressing member from causing damage to the product.

10. The filter testing device according to claim 9, characterized in that: The driving structure comprises a hinge and a rotating handle, one end of the rotating handle is rotatably connected to the pressing bracket, one end of the hinge is hinged to the rotating handle, and the other end of the hinge is hinged to the pressing member.

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