Folding hinge, hinge mechanism for folding screen, and mobile terminal

Abstract

The present invention relates to a folding hinge, a hinge mechanism for a folding screen and a mobile terminal, which are based on the design of a folding hinge, wherein the folding hinge has a mounting base; a flip assembly is symmetrically arranged on the left and right sides of the mounting base; an even-numbered gear set is arranged on the mounting base; the flip assembly includes a driving block, a first rotating plate, a second rotating plate and a damping member; one end of the first rotating plate is rotatably connected to the mounting base, and the other end of the first rotating plate is rotatably connected to the driving block; one end of the second rotating plate is a compensation part, and the other end is a driving part, and an arc-shaped part expanding outward is between the compensation part and the driving part; the compensation part of the second rotating plate forms a sliding compensation fit with the driving block; the driving parts of the second rotating plates on the left and right sides of the mounting base are respectively matched with the gear transmission on both sides of the even-numbered gear set, so that the flip assembly on both sides forms a synchronous flip through the even-numbered gear set. The present invention can provide a larger accommodating space for the folding part of the folding screen, and at the same time, the structure is simple and the operation is stable.

Description

Technical Field

[0001] The present invention relates to electronic equipment components, and in particular to a folding hinge, a hinge mechanism for a folding screen, and a mobile terminal. Background Art

[0002] With the continuous advancement and expansion of technology in the field of mobile terminals, and the advent of the 5G network era, people are becoming more and more dependent on mobile terminals. Nowadays, with the continuous updating of various chat, video and other software, people feel that conventional touch screen phones or tablets are no longer enough, mainly because the size of the screen is limited by the size of the mobile terminal.

[0003] In order to solve this problem, people invented flexible screens and applied them to mobile terminals. Through the folding design, the mobile terminal can meet people's requirements for portability and can expand the screen of the mobile terminal by unfolding when needed. In order to achieve the above requirements, the key lies in whether the design of the hinge mechanism is reasonable.

[0004] The hinge mechanism of the current mobile terminal with folding screen can have a complex mechanical structure. In order to achieve synchronous flipping and damping feel in a limited space, different mechanical components are often needed to meet the requirements. At the same time, these mechanical components occupy a large amount of installation space. At the same time, when the hinge mechanism is closed, the hinge mechanism needs to provide a storage space for the folding part of the folding screen. If the storage space is too small, it is easy to cause the hinge mechanism and the folding part to be squeezed and collided, thereby affecting the service life of the folding screen. Summary of the invention

[0005] The first object of the present invention is to provide a folding hinge which can form a larger cavity when folded and retracted.

[0006] The technical scheme for achieving the first object of the present invention is as follows: the folding hinge of the present invention has a mounting base; the left and right sides of the mounting base are symmetrically provided with a flip assembly; the mounting base is provided with an even-numbered gear set; the flip assembly includes a driving block, a first rotating plate, a second rotating plate, and a damping member for forming a damped rotation when the flip assembly flips; one end of the first rotating plate is rotatably connected to the mounting base, and the other end of the first rotating plate is rotatably connected to the driving block; one end of the second rotating plate is a compensation part, and the other end is a driving part, and an arc-shaped part expanding outward is between the compensation part and the driving part; the compensation part of the second rotating plate forms a sliding compensation fit with the driving block; the driving parts of the second rotating plates on the left and right sides of the mounting base are respectively matched with the gear transmission on both sides of the even-numbered gear set, so that the flip assembly on both sides forms a synchronous flip through the even-numbered gear set; when the driving block is in the closed state of the folding hinge, the ends of the first rotating plate and the driving block that are rotatably connected are close to each other, and the ends of the first rotating plate and the mounting base that are rotatably connected are far away from each other; and a cavity expanding outward is formed between the arc-shaped parts of the second rotating plates on the left and right sides of the mounting base.

[0007] The first rotating plate is rotationally connected to the mounting base through the compensation slider; the mounting base forms a virtual axis rotation fit with the outer side of the compensation slider; the end of the first rotating plate that is not rotationally connected to the driving block forms a virtual axis rotation fit with the inner side of the compensation slider.

[0008] The above-mentioned compensation slider is provided with a first limit slot; a first limit block is provided at one end of the first rotating plate that rotates with the compensation slider; the first limit block is set in the first limit slot as the first rotating plate and the compensation slider rotate and slide relative to each other; when the driving block is in a closed state, the first limit block is located at one end of the first limit slot, and forms a limit cooperation with the first limit slot to limit the first rotating plate from continuing to flip toward the closing direction of the driving block.

[0009] The driving block is provided with an arc-shaped compensation slot; the compensation portion of the second rotating plate is slidably arranged in the arc-shaped compensation slot.

[0010] The above-mentioned driving block is provided with a second limiting slot arranged along the extension direction of the arc-shaped compensation slot; the compensation part of the second rotating plate is provided with a second limiting block; the second limiting block is set in the second limiting slot as the second rotating plate and the driving block rotate and slide relative to each other; when the driving block is in a fully open state, the second limiting block is located at one end of the second limiting slot, and forms a limiting fit with the second limiting slot to limit the second rotating plate from continuing to flip in the opening direction of the driving block.

[0011] The above-mentioned damping member includes a first damping tooth which is arranged on the driving part of the second rotating plate and rotates coaxially with the driving part, and a second damping tooth which seeks to engage with the first damping tooth under the action of a damping spring; as the flip assembly rotates, the first damping tooth and the second damping tooth on the corresponding side form a damped rotation through the distance difference formed during the continuous engagement process.

[0012] Both sides of the compensation slider form a virtual axis rotation fit with the mounting base; both sides of the end of the first rotating plate that is not rotationally connected to the driving block form a virtual axis rotation fit with both sides of the compensation slider.

[0013] The first rotating plate is rotatably connected to the driving block via a rotating shaft.

[0014] The even-numbered gear set is rotatably arranged on the mounting base; the output shaft of the gear that is in transmission cooperation with the driving part of the second rotating plate passes through the driving part, the second damping tooth and the damping spring in sequence; the damping spring acts on the mounting base and the second damping tooth respectively; the output shaft of the gear that is in transmission cooperation with the driving part of the second rotating plate forms a circumferential transmission cooperation with the driving part of the second rotating plate; the output shaft of the gear that is in transmission cooperation with the driving part of the second rotating plate can rotate in the second damping tooth and the damping spring without driving the second damping tooth and the damping spring to rotate.

[0015] The above-mentioned mounting base includes a reference body, a retaining frame, and a limit frame; the reference body is rotatably connected to the first rotating plate; the retaining frame is fixedly installed on the reference body; the even-numbered gear set is rotatably set on the retaining frame, and the limit frame is fixedly installed on the retaining frame; the output shaft of the gear that is transmission-matched with the driving part of the second rotating plate passes through the driving part, the second damping tooth and the damping spring in sequence and is rotatably connected to the limit frame; the two ends of the damping spring act on the limit frame and the second damping tooth respectively; the second damping teeth located on the left and right sides of the mounting base are connected into one by a connecting rod.

[0016] The second object of the present invention is to provide a hinge mechanism for a folding screen, which has a simple structure, stable and efficient operation, and can provide a larger accommodation space for the folding part of the folding screen, reduce or avoid extrusion and collision of the folding part of the folding screen, thereby effectively protecting the folding part of the folding screen.

[0017] The technical solution for achieving the second purpose of the present invention is: the hinge mechanism for the folding screen in the present invention includes a hinge mounting seat, a plurality of folding hinges of the above-mentioned type, and a support plate for supporting the folding part of the flexible screen; a plurality of folding hinges are fixedly mounted on the hinge mounting seat along the extension direction of the hinge mounting seat; support plates are provided between the first rotating plates on the same side of adjacent folding hinges, and both ends of the support plates are respectively fixedly connected to the corresponding first rotating plates.

[0018] The third object of the present invention is to provide a mobile terminal using the above-mentioned hinge mechanism for a folding screen, which can effectively reduce or even avoid the squeezing and collision of the folding part of the flexible screen, and has an outstanding folding feel.

[0019] The technical solution for achieving the third purpose of the present invention is: the mobile terminal in the present invention includes the above-mentioned hinge mechanism for the folding screen; it also includes a flexible screen, a left casing and a right casing; the inner sides of the left casing and the right casing are respectively installed with a left support plate and a right support plate for supporting the rotation of the flexible screen, and the left support plate and the right support plate are fixedly connected to the flexible screen; the left casing is fixedly connected to the driving block of the flip assembly on the left side of each folding hinge; the right casing is fixedly connected to the driving block of the flip assembly on the right side of each folding hinge.

[0020] The present invention has positive effects: (1) in the present invention, the ends of the folding hinge connected to the mounting base through the first rotating plate are rotatably connected to each other and are separated from each other, and an outwardly expanding cavity is formed between the arc-shaped portions of the second rotating plates on both sides to increase the accommodation space provided for the folding portion of the folding screen, thereby reducing or avoiding the folding hinge from squeezing and colliding with the folding portion of the folding screen, and effectively protecting the folding portion of the folding screen; at the same time, the present invention has a simple structure and stable operation.

[0021] (2) In the present invention, the lower end of the first rotating plate is rotatably connected to the mounting base via a compensating slider, which can increase the outward expansion angle of the lower end of the first rotating plate, thereby providing a larger accommodation space for the folding portion of the folding screen.

[0022] (3) The present invention can ensure the verticality of the driving block through the limiting cooperation between the first limiting sliding groove and the first limiting block, thereby ensuring that the closing will not over-rotate.

[0023] (4) The present invention can effectively prevent the problem of over-opening of the second rotating plate by means of the cooperation between the second limiting sliding groove and the second limiting block.

[0024] (5) The damping member in the present invention can lock the flip assembly during the flipping process, thereby improving the flipping feel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein

[0026] Figure 1 It is a structural schematic diagram of the folding hinge in the present invention in a fully opened state;

[0027] Figure 2 It is a structural schematic diagram of the folding hinge in the present invention in a 130-degree open state;

[0028] Figure 3 It is a structural schematic diagram of the folding hinge in the present invention in a closed state;

[0029] Figure 4 It is a structural schematic diagram of the first rotating plate in the present invention;

[0030] Figure 5 It is a structural schematic diagram of the second rotating plate in the present invention;

[0031] Figure 6 It is a schematic diagram of the structure of the driving block in the present invention;

[0032] Figure 7 It is a schematic diagram of the structure of the compensation slider in the present invention;

[0033] Figure 8 It is a structural schematic diagram of the hinge mechanism for the folding screen in the present invention in a fully opened state;

[0034] Fig. 9 It is a structural schematic diagram of the hinge mechanism for the folding screen in the present invention in a 130-degree open state;

[0035] Fig.10 It is a structural schematic diagram of the hinge mechanism for the folding screen in the present invention in a closed state;

[0036] Fig.11 This is a front view of the hinge mechanism for the folding screen in the present invention in a closed state;

[0037] Fig.12 It is a structural schematic diagram of the mobile terminal in the present invention in a fully opened state;

[0038] Fig.13 It is a structural schematic diagram of the mobile terminal in the present invention in a 130-degree open state;

[0039] Fig.14 It is a structural schematic diagram of the mobile terminal in the present invention in a closed state. DETAILED DESCRIPTION

[0040] See Figures 1 to 7 The folding hinge of the present invention comprises a mounting base 1; a flip assembly 2 is symmetrically arranged on the left and right sides of the mounting base 1; an even-numbered gear set 3 is arranged on the mounting base 1; the flip assembly 2 comprises a driving block 21, a first rotating plate 22, a second rotating plate 23 and a damping member 24 for forming a damped rotation when the flip assembly 2 is flipped; one end of the first rotating plate 22 is rotationally connected to the mounting base 1 through a compensating slider 25, and the other end of the first rotating plate 22 is rotationally connected to the driving block 21 through a rotating shaft 4.

[0041] The mounting base 1 forms a virtual axis rotation fit with the outer side of the compensation slider 25; the end of the first rotating plate 22 that is not rotationally connected to the driving block 21 forms a virtual axis rotation fit with the inner side of the compensation slider 25. The so-called virtual axis rotation fit is a sliding fit formed by the arc groove and the arc block.

[0042] The compensation slider 25 is provided with a first limiting slot 251; one end of the first rotating plate 22 that rotates with the compensation slider 25 is provided with a first limiting block 221; the first limiting block 221 is set in the first limiting slot 251 as the first rotating plate 22 and the compensation slider 25 rotate and slide relative to each other; when the driving block 21 is in a closed state, the first limiting block 221 is located at one end of the first limiting slot 251, and forms a limiting cooperation with the first limiting slot 251 to limit the first rotating plate 22 from continuing to flip toward the closing direction of the driving block 21.

[0043] One end of the second rotating plate 23 is a compensation portion 231, and the other end is a driving portion 232. There is an arc-shaped portion 233 that expands outward between the compensation portion 231 and the driving portion 232; the compensation portion 231 of the second rotating plate 23 forms a sliding compensation fit with the driving block 21; the driving portions 232 of the second rotating plates 23 on the left and right sides of the mounting base 1 respectively cooperate with the gear transmissions on both sides of the even-numbered gear set 3, so that the flap assemblies 2 on both sides are synchronously flipped through the even-numbered gear set 3; when the driving block 21 is in a closed state of the folding hinge, the ends of the first rotating plate 22 and the driving block 21 that are rotatably connected are close to each other, and the ends of the first rotating plate 22 and the compensation slider 25 that are rotatably connected are away from each other, and at the same time, the compensation sliders 25 on both sides are also pulled away from each other by the first rotating plate 22; and an outward-expanding cavity is formed between the arc-shaped portions 233 of the second rotating plates 23 on the left and right sides of the mounting base 1.

[0044] The driving block 21 is provided with an arc-shaped compensation slot 211 ; the compensation portion 231 of the second rotating plate 23 is slidably disposed in the arc-shaped compensation slot 211 .

[0045] The driving block 21 is provided with a second limiting slot 212 arranged along the extension direction of the arc-shaped compensation slot 211; the compensation part 231 of the second rotating plate 23 is provided with a second limiting block 231-1; the second limiting block 231-1 is arranged in the second limiting slot 212 as the second rotating plate 23 and the driving block 21 rotate and slide relative to each other; when the driving block 21 is in a fully open state, the second limiting block 231-1 is located at one end of the second limiting slot 212, and forms a limiting fit with the second limiting slot 212 to limit the second rotating plate 23 from continuing to flip in the opening direction of the driving block 21.

[0046] The damping member 24 includes a first damping tooth 241 which is arranged on the driving portion 232 of the second rotating plate 23 and rotates coaxially with the driving portion 232, and a second damping tooth 242 which seeks to engage with the first damping tooth 241 under the action of a damping spring 243; as the flip assembly 2 rotates, the first damping tooth 241 and the second damping tooth 242 on the corresponding side form a damped rotation through the distance difference formed during the continuous engagement process.

[0047] Both sides of the compensation slider 25 form a virtual axis rotational fit with the mounting base 1; both sides of the end of the first rotating plate 22 that is not rotationally connected to the driving block 21 form a virtual axis rotational fit with both sides of the compensation slider 25, so as to achieve a more stable rotational fit.

[0048] The mounting base 1 includes a reference body 11, a retaining frame 12, and a limit frame 13; the reference body 11 is rotatably connected to the first rotating plate 22; the retaining frame 12 is fixedly installed on the reference body 11; the even-numbered gear set 3 is rotatably set on the retaining frame 12, and the limit frame 13 is fixedly installed on the retaining frame 12; the output shaft of the gear that is transmission-matched with the driving part 232 of the second rotating plate 23 passes through the driving part 232, the second damping tooth 242 and the damping spring 243 in sequence and is rotatably connected to the limit frame 13; the two ends of the damping spring 243 act on the limit frame 13 and the second damping tooth 242 respectively; the second damping teeth 242 located on the left and right sides of the mounting base 1 are connected into one by a connecting rod. The output shaft of the gear that is in transmission cooperation with the driving part 232 of the second rotating plate 23 forms a circumferential transmission cooperation with the driving part 232 of the second rotating plate 23; the output shaft of the gear that is in transmission cooperation with the driving part 232 of the second rotating plate 23 can rotate in the second damping tooth 242 and the damping spring 243 without driving the second damping tooth 242 and the damping spring 243 to rotate.

[0049] See Figures 8 to 11 The hinge mechanism for the folding screen in the present invention includes a hinge mounting seat 5, three of the above-mentioned folding hinges, and a support plate 6 for supporting the folding part of the flexible screen 7; the three folding hinges are fixedly mounted on the hinge mounting seat 5 along the extension direction of the hinge mounting seat 5; support plates 6 are provided between the first rotating plates 22 on the same side of adjacent folding hinges, and the two ends of the support plate 6 are respectively fixedly connected to the corresponding first rotating plates 22.

[0050] See Figure 12 to Figure 14 The mobile terminal in the present invention includes the above-mentioned hinge mechanism for a folding screen; it also includes a flexible screen 7, a left casing 8 and a right casing 9; the inner sides of the left casing 8 and the right casing 9 are respectively installed with a left support plate and a right support plate for supporting the rotation of the flexible screen 7, and the left support plate and the right support plate are fixedly connected to the flexible screen 7; the left casing 8 is fixedly connected to the driving block 21 of the flip assembly 2 on the left side of each folding hinge; the right casing 9 is fixedly connected to the driving block 21 of the flip assembly 2 on the right side of each folding hinge.

[0051] The folding process of the mobile terminal in the present invention is as follows:

[0052] From the closed state to the fully open state: by manually flipping the left side casing 8 and / or the right side casing 9 downward, the driving block 21 is driven to flip downward, and the downward flipping of the driving block 21 drives the first rotating plate 22 and the second rotating plate 23 to rotate downward; at the same time, under the action of the even-numbered transmission gear set 3, the flipping components 2 on the left and right sides are synchronously rotated in opposite directions; during the rotation process, the second rotating plate 23 realizes damped rotation under the action of the damping member 24, and can be stopped midway; when fully opened, the left side casing 8 and the right side casing 9 are in the same horizontal plane, and the opening is completed.

[0053] From the fully open state to the closed state: by manually flipping the left housing 8 and / or the right housing 9 upwards, the driving block 21 is driven to flip upwards, and the upward flipping of the driving block 21 drives the first rotating plate 22 and the second rotating plate 23 to rotate upward; at the same time, under the action of the even-numbered transmission gear set 3, the flipping components 2 on the left and right sides are synchronously rotated in opposite directions; during the rotation process, the second rotating plate 23 realizes damped rotation under the action of the damping member 24, and can be stopped halfway; when the left housing 8 and the right housing 9 are fully closed, the ends of the first rotating plate 22 and the driving block 21 that are rotatably connected are close to each other, and the ends of the first rotating plate 22 and the compensation slider 25 that are rotatably connected are away from each other, and at the same time, the compensation sliders 25 on both sides are also pulled away from each other by the first rotating plate 22; and an outwardly expanding cavity is formed between the arc-shaped portions 233 of the second rotating plates 23 on the left and right sides of the mounting base 1, and the folding portion of the flexible screen 7 is well placed in the cavity formed by the first rotating plate 22 and the second rotating plate 23.

[0054] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A folding hinge having a mounting base; characterized in that: The left and right sides of the mounting base are symmetrically provided with flipping assemblies; the mounting base is provided with an even-numbered gear set; the flipping assembly includes a driving block, a first rotating plate, a second rotating plate and a damping member for forming a damped rotation when the flipping assembly flips; one end of the first rotating plate is rotatably connected to the mounting base, and the other end of the first rotating plate is rotatably connected to the driving block; one end of the second rotating plate is a compensation part, and the other end is a driving part, and an arc-shaped part expanding outward is between the compensation part and the driving part; the compensation part of the second rotating plate forms a sliding compensation fit with the driving block; the driving parts of the second rotating plates on the left and right sides of the mounting base are respectively matched with the gear transmission on both sides of the even-numbered gear set, so that the flip plate assemblies on both sides are synchronously flipped through the even-numbered gear set; when the driving block is in the closed state of the folding hinge, the ends of the first rotating plate and the driving block that are rotatably connected are close to each other, and the ends of the first rotating plate and the mounting base that are rotatably connected are away from each other; and a cavity expanding outward is formed between the arc-shaped parts of the second rotating plates on the left and right sides of the mounting base; The first rotating plate is rotatably connected to the mounting base through the compensation slider; the mounting base forms a virtual axis rotation fit with the outer side of the compensation slider; the end of the first rotating plate that is not rotatably connected to the driving block forms a virtual axis rotation fit with the inner side of the compensation slider; The compensating slide block is provided with a first limiting slide groove; a first limiting block is provided at one end of the first rotating plate that rotates with the compensating slide block; the first limiting block is arranged in the first limiting slide groove as the first rotating plate and the compensating slide block rotate relative to each other; when the driving block is in a closed state, the first limiting block is located at one end of the first limiting slide groove, and forms a limiting match with the first limiting slide groove to limit the first rotating plate from continuing to flip toward the closing direction of the driving block; The driving block is provided with an arc-shaped compensation slot; the compensation portion of the second rotating plate is slidably arranged in the arc-shaped compensation slot; The driving block is provided with a second limiting slot arranged along the extension direction of the arc-shaped compensation slot; the compensation part of the second rotating plate is provided with a second limiting block; the second limiting block is set in the second limiting slot as the second rotating plate and the driving block rotate and slide relative to each other; when the driving block is in a fully open state, the second limiting block is located at one end of the second limiting slot, and forms a limiting fit with the second limiting slot to limit the second rotating plate from continuing to flip in the opening direction of the driving block.

2. A folding hinge according to claim 1, characterized in that: The damping member includes a first damping tooth which is arranged on the driving part of the second rotating plate and rotates coaxially with the driving part, and a second damping tooth which seeks to engage with the first damping tooth under the action of a damping spring; as the flip assembly rotates, the first damping tooth and the second damping tooth on the corresponding side form a damped rotation through the distance difference formed during the continuous engagement process.

3. The folding hinge according to claim 1, characterized in that: Both sides of the compensation slider form a virtual axis rotation fit with the mounting base; both sides of the end of the first rotating plate that is not rotationally connected to the driving block form a virtual axis rotation fit with both sides of the compensation slider.

4. The folding hinge according to claim 1, characterized in that: The first rotating plate is rotatably connected to the driving block via a rotating shaft.

5. The folding hinge according to claim 2, characterized in that: The even-numbered gear set is rotatably arranged on the mounting base; the output shaft of the gear that is in transmission cooperation with the driving part of the second rotating plate passes through the driving part, the second damping tooth and the damping spring in sequence; the damping spring acts on the mounting base and the second damping tooth respectively; the output shaft of the gear that is in transmission cooperation with the driving part of the second rotating plate forms a circumferential transmission cooperation with the driving part of the second rotating plate; the output shaft of the gear that is in transmission cooperation with the driving part of the second rotating plate can rotate in the second damping tooth and the damping spring without driving the second damping tooth and the damping spring to rotate.

6. A folding hinge according to claim 5, characterized in that: The mounting base includes a reference body, a retaining frame, and a limit frame; the reference body is rotatably connected to the first rotating plate; the retaining frame is fixedly installed on the reference body; the even-numbered gear set is rotatably set on the retaining frame, and the limit frame is fixedly installed on the retaining frame; the output shaft of the gear that is transmission-matched with the driving part of the second rotating plate passes through the driving part, the second damping tooth and the damping spring in sequence and is rotatably connected to the limit frame; the two ends of the damping spring act on the limit frame and the second damping tooth respectively; the second damping teeth located on the left and right sides of the mounting base are connected into one by a connecting rod.

7. A hinge mechanism for a folding screen, characterized in that: It includes a hinge mounting seat, a plurality of folding hinges as described in claim 1 or 2 or 3 or 4 or 5 or 6, and a support plate for supporting the folding part of the flexible screen; a plurality of folding hinges are fixedly mounted on the hinge mounting seat along the extension direction of the hinge mounting seat; a support plate is provided between the first rotating plates on the same side of adjacent folding hinges, and both ends of the support plate are respectively fixedly connected to the corresponding first rotating plates.

8. A mobile terminal, characterized in that: The invention comprises the hinge mechanism for a folding screen as claimed in claim 7; further comprising a flexible screen, a left housing and a right housing; a left support plate and a right support plate for supporting the rotation of the flexible screen are respectively installed on the inner sides of the left housing and the right housing, and the left support plate and the right support plate are fixedly connected to the flexible screen; The left housing is fixedly connected to the driving block of the flip assembly on the left side of each folding hinge; the right housing is fixedly connected to the driving block of the flip assembly on the right side of each folding hinge.

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