Manual vertical lifting mechanism, armrest and sofa

Abstract

The invention discloses a manual vertical lifting mechanism, an armrest and a sofa. The manual vertical lifting mechanism comprises a first parallelogram transmission mechanism, a second parallelogram transmission mechanism and a locking mechanism, wherein the first parallelogram transmission mechanism and the second parallelogram transmission mechanism share a transmission connecting rod; by rotating the first lifting connecting rod, the transmission connecting rod is driven to move in the vertical direction, and then the supporting piece is driven to achieve vertical lifting. The mechanism adopts a pure mechanical structure, is simple and labor-saving to operate and is stable in lifting. The ratchet wheel-pawl type locking mechanism can be reliably locked at multiple height positions and automatically unlocked at the maximum height, and in the reset process, the unlocking state is kept till the initial position is recovered. The mechanism is compact in structure, can further increase the lift range by adding the lifting rocker arm rod, is suitable for vertical lifting of the sofa armrest or the sofa body, and has the characteristics of high flexibility and safety and convenience in use.

Description

Technical Field

[0001] This invention relates to the field of furniture technology, and in particular to a manual vertical lifting mechanism and a sofa. Background Technology

[0002] Sofas are a popular type of seating, widely used in living rooms, hotels, and homes. To improve comfort, existing sofas typically feature height-adjustable armrests or the sofa itself. However, current technology usually uses a motor-driven worm gear mechanism to achieve this. This design results in a relatively heavy sofa, making it inconvenient to move, and it requires electricity to function properly, thus limiting its usability. Summary of the Invention

[0003] This invention provides a manual vertical lifting mechanism, armrests, and sofa, aiming to solve the problem that the existing technology uses a motor to drive a worm gear to lift the sofa armrests or the entire sofa, which requires electricity to function properly and is therefore limited in use.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, embodiments of the present invention provide a manual vertical lifting mechanism, comprising: a first parallelogram transmission mechanism and a second parallelogram transmission mechanism sharing a common transmission link, and a locking mechanism for locking the first parallelogram transmission mechanism in multiple positions. The transmission link is provided with two first rotation centers in the same vertical direction; The first parallelogram transmission mechanism includes a first lifting link that is rotatably connected to the transmission link; The second parallelogram transmission mechanism includes a support member, on which two second rotation centers are arranged in the same vertical direction. The distance between the two first rotation centers is the same as the distance between the two second rotation centers.

[0005] In one embodiment, the first parallelogram transmission mechanism further includes a fixing member and a second lifting link; the fixing member is provided with a first fixing center and a second fixing center; The first lifting link is provided with a first lifting center and a second lifting center; the first lifting center is coaxially engaged with the first fixed center, and the second lifting center is coaxially engaged with one of the first rotation centers of the transmission link; The second lifting link is provided with a third lifting center and a fourth lifting center. The third lifting center and the second fixed center are coaxially engaged. The fourth lifting center is coaxially engaged with another first rotation center of the transmission link.

[0006] In one embodiment, the second parallelogram transmission mechanism further includes a first driven link and a second driven link; The first driven link is provided with a first driven center and a second driven center; the first driven center is coaxially engaged with one of the second rotation centers of the support member; the second driven center is coaxially engaged with one of the first rotation centers of the transmission link; The second driven link is provided with a third driven center and a fourth driven center. The third driven center is coaxially engaged with another second rotation center of the support member; the fourth driven center is coaxially engaged with another first rotation center of the transmission link.

[0007] In one embodiment, the end of the first lifting link away from the second lifting center extends outward to form an extension rod; The locking mechanism includes a fixed plate, a ratchet plate fixed on the fixed plate, a ratchet pawl rotatably connected to the extension rod, and a switching spring; The ratchet plate is provided with a plurality of ratchet teeth; the fixed plate is provided with a crescent groove for guiding the ratchet pawl to swing, and a guide rod is provided on the ratchet pawl; the switching spring pulls the ratchet pawl so that the guide rod remains in contact with the side wall of the crescent groove.

[0008] In one embodiment, the inner wall of the crescent groove includes a top wall, a bottom wall, an inner wall near the ratchet plate, and an outer wall away from the ratchet plate. The outer wall is connected to the top wall by an arc transition. The top wall and the bottom wall are inclined.

[0009] In one embodiment, the extension rod is provided with a side shaft, and the ratchet pawl is rotatably mounted on the side shaft; The two ends of the switching spring are connected to the extension rod and the ratchet pawl, respectively.

[0010] In one embodiment, the ratchet pawl is provided with a ratchet hole, and the guide rod is disposed through the ratchet hole; one end of the guide rod is inserted into the crescent groove, and the other end of the guide rod is connected to the switching spring.

[0011] In one embodiment, the fixing plate and the fixing member are integrally formed.

[0012] In one embodiment, the fixing member is provided with a limiting member for restricting the downward swing of the first lifting link.

[0013] In one embodiment, it further includes a lifting rocker arm, on which a first rocker arm center and a second rocker arm center are provided; The second driven link extends away from the third driven center to form an auxiliary link, and the end of the auxiliary link is provided with an auxiliary center that is coaxially engaged with the center of the second rocker arm; The second lifting link is provided with a rocker arm connection center, which is located between the first lifting center and the second lifting center; the rocker arm connection center is coaxially engaged with the first rocker arm center.

[0014] In a second aspect, embodiments of the present invention also provide an armrest, including a sofa body, a sofa armrest, and the aforementioned manual vertical lifting mechanism; The sofa armrests are fixedly mounted on the support member.

[0015] In a third aspect, embodiments of the present invention also provide a sofa, including a sofa body and the aforementioned manual vertical lifting mechanism; The sofa body is fixedly mounted on the support member.

[0016] The advantages of this invention compared to the prior art are: (1) Simple structure, purely mechanical drive: The mechanism is composed entirely of mechanical structures such as connecting rods and rotating shafts, without the need for complex power systems such as motors and hydraulics. The structure is simple and reliable, and the manufacturing cost is low.

[0017] (2) Easy to use and effortless to operate: Users only need to pull the sofa armrests or the sofa body upwards to achieve smooth lifting through the parallelogram mechanism. The operation is intuitive and effortless.

[0018] (3) Multi-position locking with high flexibility: Equipped with a ratchet-pawl locking mechanism, it can reliably lock at multiple different height positions during the lifting process to meet different user needs.

[0019] (4) Smooth lifting and vertical movement: By utilizing the characteristic that the opposite sides of the parallelogram mechanism are always parallel, it is ensured that the support and the sofa armrests or body installed on them can move strictly in the vertical direction and the movement trajectory is stable.

[0020] (5) Automatic reset and unlocking mechanism: The design is ingenious. When the height is raised to the maximum, the locking mechanism will automatically unlock. During the reset and descent process, the mechanism can remain unlocked until it automatically returns to the initial locked position, making it safe and convenient to use.

[0021] (6) High space utilization and compact structure: By using a shared transmission link and integrating the fixing plate and the fixing parts into one piece, the space layout is optimized, making the whole mechanism more compact.

[0022] (7) Strong expandability and can further increase the lifting range: By adding components such as lifting rocker arm, the lifting action can be further amplified to achieve a higher lifting height and meet more diverse application needs.

[0023] (8) Wide application and strong adaptability: This mechanism can be used to realize the vertical lifting of the sofa armrests and the vertical lifting of the entire sofa body, and has good versatility.

[0024] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are described in detail below. Attached Figure Description

[0025] Figure 1 A three-dimensional structure in its initial state for a manual vertical lifting mechanism provided in an embodiment of the present invention; Figure 2 This is a front view of a manual vertical lifting mechanism in its initial state, provided in an embodiment of the present invention. Figure 3 A rear view of a manual vertical lifting mechanism in its initial state, provided in an embodiment of the present invention; Figure 4 A three-dimensional structure of a manual vertical lifting mechanism in working state, provided in an embodiment of the present invention; Figure 5 for Figure 4 A magnified view of a portion of the image; Figure 6 This is a front view of a manual vertical lifting mechanism in its working state, provided by an embodiment of the present invention. Figure 7 A rear view of a manual vertical lifting mechanism in its working state, provided as an embodiment of the present invention; Figure 8 A three-dimensional structural diagram of a manual vertical lifting mechanism in its maximum lifting state, provided as an embodiment of the present invention; Figure 9 This is a front view of a manual vertical lifting mechanism in its maximum lifting state, provided in an embodiment of the present invention. Figure 10 A rear view of a manual vertical lifting mechanism in its maximum lifting state, provided as an embodiment of the present invention; Figure 11 A three-dimensional structural diagram of a manual vertical lifting mechanism in the reset state, provided for an embodiment of the present invention; Figure 12This is a front view of a manual vertical lifting mechanism in the reset state, provided in an embodiment of the present invention. Figure 13 This is a rear view of a manual vertical lifting mechanism in the reset state, provided as an embodiment of the present invention.

[0026] Figure label: 1. First parallelogram transmission mechanism; 11. First lifting link; 111. First lifting center; 112. Second lifting center; 113. Extending rod; 114. Side shaft; 12. Second lifting link; 121. Third lifting center; 122. Fourth lifting center; 123. Rocker arm connection center; 13. Fixing component; 131. First fixing center; 132. Second fixing center; 133. Limiting component; 2. Second parallelogram transmission mechanism, 21. First driven link, 211. First driven center, 212. Second driven center, 22. Second driven link, 221. Third driven center, 222. Fourth driven center, 223. Auxiliary rod, 224. Auxiliary center, 23. Support member, 231. Second rotation center; 3. Transmission connecting rod; 31. First rotation center; 4. Locking mechanism, 41. Fixing plate, 411. Crescent groove, 4111. Top wall, 4112. Bottom wall, 4113. Inner side wall, 4114. Outer side wall, 42. Ratchet plate, 421. Ratchet tooth, 43. Ratchet pawl, 431. Guide rod, 44. Switching spring. 5. Raise the rocker arm; 51. Center of the first rocker arm; 52. Center of the second rocker arm; A. First hinge point; B. Second hinge point; C. Third hinge point; D. Fourth hinge point; E, the fifth hinge point; F, the sixth hinge point. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0029] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0030] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0031] Please see Figure 1-3 This invention provides a manual vertical lifting mechanism, comprising: a first parallelogram transmission mechanism 1 and a second parallelogram transmission mechanism 2 sharing a common transmission link 3, and a locking mechanism 4 for locking the first parallelogram transmission mechanism 1 in multiple positions. The transmission link 3 is provided with two first rotation centers 31 in the same vertical direction; The first parallelogram transmission mechanism 1 includes a first lifting link 11 that is rotatably connected to the transmission link 3; The second parallelogram transmission mechanism 2 includes a support member 23, on which two second rotation centers 231 are arranged in the same vertical direction. The distance between the two first rotation centers 31 and the distance between the two second rotation centers 231 are the same. Rotating the first lifting link 11 causes the transmission link 3 to move vertically via the first parallelogram transmission mechanism 1, and the transmission link 3 causes the support member 23 to move vertically via the second parallelogram transmission mechanism 2.

[0032] In this embodiment, a manual vertical lifting mechanism utilizes two sets of parallelogram transmission mechanisms to lift the support member 23 upwards. Due to the special structure of the parallelogram, the parallel sides always remain parallel. Therefore, in this embodiment, the transmission link 3 is set along the vertical direction. When the first lifting link 11 rotates, the first parallelogram transmission mechanism 1 can drive the transmission link 3 to move in the vertical direction. Similarly, the transmission link 3 drives the support member 23 to move in the vertical direction through the second parallelogram transmission mechanism 2, thereby realizing the movement of the support member 23 in the vertical direction.

[0033] When the sofa armrests or the entire sofa are fixed to the support member 23, the sofa armrests or the entire sofa can be pulled upwards, causing them to move vertically upwards. The support member 23 moves vertically, and the support member 23 drives the transmission link 3 to move vertically upwards through the second parallelogram transmission mechanism 2. The transmission link 3 causes the first parallelogram transmission mechanism 1 to deform. When it is raised to a specific height, the locking mechanism 4 can lock the first parallelogram transmission mechanism 1, thereby locking the entire mechanism.

[0034] This embodiment utilizes two sets of parallelogram transmission mechanisms to lift the support member 23 upwards, and in conjunction with the locking mechanism 4, achieves the vertical lifting action of the sofa body or sofa armrests. This embodiment employs a completely mechanical structure, featuring structural stability and ease of use.

[0035] In this embodiment, specifically, the first parallelogram transmission mechanism 1 further includes a fixing member 13 and a second lifting link 12; the fixing member 13 is provided with a first fixing center 131 and a second fixing center 132; The first lifting link 11 is provided with a first lifting center 111 and a second lifting center 112; the first lifting center 111 is coaxially engaged with the first fixed center 131, and the second lifting center 112 is coaxially engaged with one of the first rotation centers 31 of the transmission link 3. The second lifting link 12 is provided with a third lifting center 121 and a fourth lifting center 122. The third lifting center 121 and the second fixed center 132 are coaxially engaged. The fourth lifting center 122 is coaxially engaged with another first rotation center 31 of the transmission link 3.

[0036] In this embodiment, the first lifting link 11, the second lifting link 12, the transmission link 3, and the fixing member 13 cooperate to form the first parallelogram transmission mechanism 1. The first fixed center 131 cooperates with the first lifting center 111 to form the first hinge point A; the second fixed center 132 cooperates with the third lifting center 121 to form the second hinge point B; the fourth lifting center 122 cooperates with one of the first rotation centers 31 of the transmission link 3 to form the third hinge point C; and the other first transmission center 31 cooperates with the second lifting center 112 to form the fourth hinge point D. The first hinge point A, the second hinge point B, the third hinge point C, and the fourth hinge point D constitute the four hinge points of the first parallelogram transmission mechanism 1. The first hinge point A and the second hinge point B are arranged along the same vertical direction, and the third hinge point C and the fourth hinge point D are also arranged along the same vertical direction.

[0037] In this embodiment, for ease of assembly, the first lifting center 111, the second lifting center 112, the third lifting center 121, the fourth lifting center 122, the first fixing center 131, the second fixing center 132, and the two first rotation centers 31 are all configured as through holes on their respective components, and are coaxially rotated and connected by rotating shafts.

[0038] In a further embodiment, the second parallelogram transmission mechanism 2 further includes a first driven link 21 and a second driven link 22; The first driven link 21 is provided with a first driven center 211 and a second driven center 212; the first driven center 211 is coaxially engaged with one of the second rotation centers 231 of the support member 23; the second driven center 212 is coaxially engaged with one of the first rotation centers 31 of the transmission link 3; The second driven link 22 is provided with a third driven center 221 and a fourth driven center 222. The third driven center 221 is coaxially engaged with another second rotation center 231 of the support member 23; the fourth driven center 222 is coaxially engaged with another first rotation center 31 of the transmission link 3.

[0039] In this embodiment, the first driven link 21, the second driven link 22, the support member 23, and the transmission link 3 cooperate to form the second parallelogram transmission mechanism 2. The first driven center 211 cooperates with one of the rotation centers 231 of the support member 23 to form the fifth hinge point E; the third driven center 221 cooperates coaxially with the other second rotation center 231 of the support member 23 to form the sixth hinge point F; the second driven center 212, the fourth lifting center 122 cooperates with one of the first rotation centers 31 of the transmission link 3 to form the third hinge point C; the fourth driven center 222, the second lifting center 112 cooperates with the other first rotation center 31 of the transmission link 3 to form the fourth hinge point D. The third hinge point C, the fourth hinge point D, the fifth hinge point E, and the sixth hinge point F constitute the four hinge points of the second parallelogram transmission mechanism 2. The first hinge point A and the second hinge point B are set along the vertical direction, and the third hinge point C, the fourth hinge point D, the fifth hinge point E and the sixth hinge point F are also set along the vertical direction.

[0040] In this embodiment, for ease of assembly, the first driven center 211, the second driven center 212, the third driven center 221, and the fourth driven center 222 are all configured as through holes on their respective components, and are connected coaxially by a rotating shaft.

[0041] The fixing member 13 is provided with a limiting member 133 for restricting the downward swing of the first lifting link 11. The limiting member 133 can limit the downward swing angle of the first lifting link 11.

[0042] In a further embodiment, the end of the first lifting link 11 away from the second lifting center 112 extends outward to form an extension rod 113; like Figure 5 As shown, the locking mechanism 4 includes a fixed plate 41, a ratchet plate 42 fixed on the fixed plate 41, a ratchet pawl 43 rotatably connected to the extension rod 113, and a switching spring 44; in this embodiment, in order to make the overall structure more compact, the fixed plate 41 and the fixing member 13 are integrally formed.

[0043] The ratchet plate 42 is provided with a plurality of ratchet teeth 421; the fixed plate 41 is provided with a crescent groove 411 for guiding the ratchet pawl 43 to swing, and the ratchet pawl 43 is provided with a guide rod 431; the switching spring 44 pulls the ratchet pawl 43 so that the guide rod 431 remains in contact with the side wall of the crescent groove 411.

[0044] The extension rod 113 is provided with a side shaft 114, and the ratchet pawl 43 is rotatably mounted on the side shaft 114; The two ends of the switching spring 44 are respectively connected to the extension rod 113 and the ratchet pawl 43.

[0045] Specifically, the sidewall of the crescent groove 411 includes a top wall 4111, a bottom wall 4112, an inner sidewall 4113 near the ratchet plate 42, and an outer sidewall 4114 away from the ratchet plate 42. The outer sidewall 4114 is connected to the top wall 4111 by an arc transition. The top wall 4111 and the bottom wall 4112 are inclined.

[0046] The ratchet pawl 43 is provided with a ratchet hole, and the guide rod 431 is disposed through the ratchet hole; one end of the guide rod 431 is inserted into the crescent groove 411, and the other end of the guide rod 431 is connected to the switching spring 44.

[0047] The locking mechanism 4 in this embodiment includes the following working states: initial state, working state, maximum lifting state, ratchet unlocking state, and mechanism reset state.

[0048] (1) Initial state: such as Figures 1 to 3 As shown, at this time, the first lifting link 11 abuts against the limiting member 133, the ratchet pawl 43 is located at the top ratchet tooth 421, and the guide rod 431 is in contact with the top wall 4111. The switching spring 44 is located on the side of the side shaft 114 near the ratchet plate 42.

[0049] (2) Working status: such as Figures 4 to 7As shown, when the support member 23 is pulled upward, the first lifting link 11 swings upward around the first lifting center 111 (first hinge point A), causing the extension rod 113 to swing downward around the first lifting center 111. The ratchet pawl 43 slides sequentially along several ratchet teeth 421 on the ratchet plate 42. At this time, the guide rod 431 slides along the inner sidewall 4113, and the switching spring 44 is located on the side of the side shaft 114 near the ratchet plate 42. When the support member 23 loses external force, under the action of gravity, the first lifting link 11 stops swinging, and the ratchet pawl 43 is locked in the corresponding ratchet tooth 421, fixing the first lifting link 11. This achieves multi-position locking of the first parallelogram 1.

[0050] (3) Maximum lifting state: such as Figures 8 to 10 As shown, when the first lifting linkage 11 is raised to its maximum height, the guide rod 431 engages with the bottom wall 4112. The bottom wall 4112 is inclined. After the guide rod 431 contacts the bottom wall 4112, the ratchet pawl 43 rotates around the side shaft 114. The switching spring 44 is located on the side of the side shaft 114 away from the ratchet plate 42. This causes the ratchet pawl 43 to separate from the ratchet teeth 421.

[0051] (4) Mechanism reset state: such as Figures 11 to 13 As shown, the first lifting link 11 rotates clockwise around the first lifting center 111 (first hinge point A) under the action of gravity. At this time, the guide rod 431 cooperates with the outer wall 4114, and the switching spring 44 is located on the side shaft 114 and is kept away from the ratchet plate 42, so that the ratchet pawl 43 and the ratchet tooth 421 remain separated until the guide rod 431 moves to the top of the top wall 4111, and the locking structure 4 returns to the initial state.

[0052] In another embodiment, a lifting rocker arm 5 is also included, wherein a first rocker arm center 51 and a second rocker arm center 52 are provided on the lifting rocker arm 5; The second driven link 22 extends away from the third driven center 221 to form an auxiliary link 223, and the end of the auxiliary link 223 is provided with an auxiliary center 224 that is coaxially engaged with the center 52 of the second rocker arm; The second lifting link 12 is provided with a rocker arm connection center 123, which is located between the first lifting center 111 and the second lifting center 112; the rocker arm connection center 123 is coaxially engaged with the first rocker arm center 51.

[0053] In this embodiment, the first rocker arm center 51, the second rocker arm center 52, the auxiliary center 224, and the rocker arm connection center 123 are all provided with through holes on their respective components and are coaxially rotatably connected by a rotating shaft.

[0054] In this embodiment, a lifting rocker arm 5 is provided to further raise the support member 23. Specifically, as the support member 23 is raised, the distance between the second hinge point B and the fourth hinge point D increases, the second driven link 22 is pulled by the lifting rocker arm 5, and the second driven link 22 moves upward and rotates clockwise at the same time, which compresses the second parallelogram transmission mechanism 2, and the distance between the third hinge point C and the sixth hinge point F increases, thereby further raising the support member 23.

[0055] In another embodiment, the present invention also provides an armrest, including a sofa body, a sofa armrest, and the above-mentioned manual vertical lifting mechanism; The sofa armrests are fixedly mounted on the support member 23.

[0056] The sofa armrests are mounted on the support member 23. By raising the support member 23, the vertical lifting function of the sofa armrests can be achieved.

[0057] In another embodiment, the present invention also provides a sofa, including a sofa body and the above-described manual vertical lifting mechanism; The sofa body is fixedly mounted on the support member 23.

[0058] The sofa body is mounted on the support member 23. By raising the support member 23, the vertical lifting function of the sofa body can be achieved.

[0059] Compared with the prior art, the present invention has the following advantages: (1) Simple structure, purely mechanical drive: The mechanism is composed entirely of mechanical structures such as connecting rods and rotating shafts, without the need for complex power systems such as motors and hydraulics. The structure is simple and reliable, and the manufacturing cost is low.

[0060] (2) Easy to use and effortless to operate: Users only need to pull the sofa armrests or the sofa body upwards to achieve smooth lifting through the parallelogram mechanism. The operation is intuitive and effortless.

[0061] (3) Multi-position locking with high flexibility: Equipped with ratchet-pawl locking mechanism 4, it can reliably lock at multiple different height positions during the lifting process to meet different user needs.

[0062] (4) Smooth lifting and vertical movement: By utilizing the characteristic that the opposite sides of the parallelogram mechanism are always parallel, it is ensured that the support 23 and the sofa armrest or body installed on it can move strictly in the vertical direction and the movement trajectory is stable.

[0063] (5) Automatic reset and unlocking mechanism: The design is ingenious. When the height is raised to the maximum, the locking mechanism 4 will automatically unlock. During the reset and descent process, the mechanism can remain unlocked until it automatically returns to the initial locked position, making it safe and convenient to use.

[0064] (6) High space utilization and compact structure: By using the shared transmission link 3 and the design of integrally forming the fixed plate 41 and the fixed part 13, the space layout is optimized, making the whole mechanism more compact.

[0065] (7) Strong expandability and can further increase the lifting range: By adding components such as lifting rocker arm 5, the lifting action can be further amplified to achieve a higher lifting height and meet more diverse application needs.

[0066] (8) Wide application and strong adaptability: This mechanism can be used to realize the vertical lifting of the sofa armrests and the vertical lifting of the entire sofa body, and has good versatility.

[0067] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A manual vertical lifting mechanism, characterized in that, include: A first parallelogram transmission mechanism and a second parallelogram transmission mechanism that share a single transmission link, and a locking mechanism for locking the first parallelogram transmission mechanism in multiple positions. The transmission link is provided with two first rotation centers in the same vertical direction; The first parallelogram transmission mechanism includes a first lifting link that is rotatably connected to the transmission link; The second parallelogram transmission mechanism includes a support member, on which two second rotation centers are arranged in the same vertical direction. The distance between the two first rotation centers is the same as the distance between the two second rotation centers.

2. The manual vertical lifting mechanism according to claim 1, characterized in that, The first parallelogram transmission mechanism further includes a fixing member and a second lifting link; the fixing member is provided with a first fixing center and a second fixing center; The first lifting link is provided with a first lifting center and a second lifting center; the first lifting center is coaxially engaged with the first fixed center, and the second lifting center is coaxially engaged with one of the first rotation centers of the transmission link; The second lifting link is provided with a third lifting center and a fourth lifting center. The third lifting center and the second fixed center are coaxially engaged. The fourth lifting center is coaxially engaged with another first rotation center of the transmission link.

3. The manual vertical lifting mechanism according to claim 2, characterized in that, The second parallelogram transmission mechanism also includes a first driven link and a second driven link; The first driven link is provided with a first driven center and a second driven center; the first driven center is coaxially engaged with one of the second rotation centers of the support member; the second driven center is coaxially engaged with one of the first rotation centers of the transmission link; The second driven link is provided with a third driven center and a fourth driven center. The third driven center is coaxially engaged with another second rotation center of the support member; the fourth driven center is coaxially engaged with another first rotation center of the transmission link.

4. The manual vertical lifting mechanism according to claim 2, characterized in that, The end of the first lifting link that is away from the second lifting center extends outward to form an extension rod; The locking mechanism includes a fixed plate, a ratchet plate fixed on the fixed plate, a ratchet pawl rotatably connected to the extension rod, and a switching spring; The ratchet plate is provided with a plurality of ratchet teeth; the fixed plate is provided with a crescent groove for guiding the ratchet pawl to swing, and a guide rod is provided on the ratchet pawl; the switching spring pulls the ratchet pawl so that the guide rod remains in contact with the side wall of the crescent groove.

5. The manual vertical lifting mechanism according to claim 4, characterized in that, The sidewall of the crescent groove includes a top wall, a bottom wall, an inner sidewall near the ratchet plate, and an outer sidewall away from the ratchet plate. The outer sidewall is connected to the top wall by an arc transition. The top wall and the bottom wall are inclined.

6. The manual vertical lifting mechanism according to claim 5, characterized in that, The extension rod is provided with a side shaft, and the ratchet pawl is rotatably mounted on the side shaft; The two ends of the switching spring are connected to the extension rod and the ratchet pawl, respectively.

7. The manual vertical lifting mechanism according to claim 4, characterized in that, The ratchet pawl is provided with a ratchet hole, and the guide rod is disposed through the ratchet hole; one end of the guide rod is inserted into the crescent groove, and the other end of the guide rod is connected to the switching spring.

8. The manual vertical lifting mechanism according to claim 4, characterized in that, The fixing plate and the fixing component are integrally formed.

9. The manual vertical lifting mechanism according to claim 2, characterized in that, The fixing member is provided with a limiting member for restricting the downward swing of the first lifting link.

10. The manual vertical lifting mechanism according to claim 3, characterized in that, It also includes a lifting rocker arm, on which a first rocker arm center and a second rocker arm center are provided; The second driven link extends away from the third driven center to form an auxiliary link, and the end of the auxiliary link is provided with an auxiliary center that is coaxially engaged with the center of the second rocker arm; The second lifting link is provided with a rocker arm connection center, which is located between the first lifting center and the second lifting center; the rocker arm connection center is coaxially engaged with the first rocker arm center.

11. A handrail, characterized in that, It includes a sofa body, sofa armrests, and a manual vertical lifting mechanism as described in any one of claims 1 to 10; the sofa armrests are fixedly mounted on the support member.

12. A sofa, characterized in that, It includes a sofa body and a manual vertical lifting mechanism as described in any one of claims 1 to 10; the sofa body is fixedly mounted on the support member.

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