Telescopic transmission device, iron stand structure and seat

Abstract

The invention provides a telescopic transmission device, an iron stand structure and a seat. The main driving piece comprises a leg support connecting part, a limiting connecting part, a seat frame connecting part and a driving connecting part, and the driving connecting part, the leg support connecting part and the limiting connecting part rotate around the seat frame connecting part. The main transmission piece comprises a seat frame hinging part, a connecting rod hinging part and a limiting groove. The connecting rod hinge part and the limiting groove rotate around the seat frame hinge part, and the seat frame connecting part and the seat frame hinge part move synchronously. And the limiting connecting part is matched with the limiting groove, so that one of the main driving piece and the main transmission piece independently rotates. The main driving piece and the main transmission piece rotate independently through cooperation of the limiting connecting part and the limiting groove. After the telescopic transmission device is assembled with the driving motor, the leg stretching device and the seat frame, the main driving part only drives the leg stretching device to move to realize switching between a seat posture and a TV posture when rotating independently; when the main transmission part rotates independently, the seat frame is driven to realize switching between a lying posture and a TV posture; and the switching of three postures is realized through the driving of a single motor.

Description

Technical Field

[0001] The present application relates to the technical field of furniture, and in particular to a telescopic transmission device, an iron frame structure and a seat. Background Art

[0002] With the rapid development of the times, the standard and quality of life are also improving rapidly, and many different types of furniture have appeared on the market. Furniture can include comfortable and flexible functional household items such as functional soft beds, functional sofas or functional seats. There are two types of existing sofa iron frames. One is a traditional structure. The traditional structure does not have a motor and relies on the force applied by the human body to open the sofa, but there are often problems such as jitter and asynchrony during the opening process. The other is a motor structure. When a single motor is configured, the sofa can only sit and lie, and the TV posture cannot be achieved. If the TV posture is to be achieved, an additional motor needs to be added, and the structure is complicated.

[0003] Therefore, it is necessary to design a telescopic transmission device, an iron frame structure and a seat that solve the above-mentioned technical problems. Summary of the invention

[0004] The present application provides a telescopic transmission device, an iron frame structure and a seat, which can realize switching between three postures under the drive of a single motor.

[0005] According to a first aspect of an embodiment of the present specification, a telescopic transmission device is provided, which includes a main driving member and a main transmission member; the main driving member includes a leg support connection part, a limiting connection part, a seat frame connection part and a driving connection part, and the driving connection part, the leg support connection part and the limiting connection part can rotate around the seat frame connection part; the main transmission member includes a seat frame hinge part, a connecting rod hinge part and a limiting groove, and the connecting rod hinge part and the limiting groove can rotate around the seat frame hinge part; the seat frame connection part moves synchronously with the seat frame hinge part; the limiting connection part cooperates with the limiting groove to enable the main driving member and the main transmission member to rotate separately.

[0006] Further, the limiting groove includes a first groove and a second groove which are connected to each other; when the limiting connection part cooperates with the first groove, the main transmission member can remain fixed and only the main driving member rotates; when the limiting connection part cooperates with the second groove, the main driving member can remain fixed and only the main transmission member rotates.

[0007] Furthermore, the main driving component includes a driving plate, a driving connecting tube and a motor connecting frame; the driving plate and the motor connecting frame are both perpendicular to and fixed to the driving connecting tube; the leg support connecting part and the limiting connecting part are arranged on the driving plate; the seat frame connecting part is arranged on the driving connecting tube; and the driving connecting part is arranged on the motor connecting frame.

[0008] Furthermore, on the circumference of the drive connecting tube, the limiting connecting portion and the leg support connecting portion form an acute angle.

[0009] Furthermore, the main transmission member includes a transmission rod and a transmission plate that are fixedly connected, the seat frame hinge part and the connecting rod hinge part are respectively arranged at two ends of the transmission rod; the first groove and the second groove are arranged on the transmission plate.

[0010] Furthermore, the first groove and the second groove are both arc-shaped, the second groove and the seat frame hinge form a fan-shaped area, the first groove is located in the fan-shaped area, and the protrusion direction of the first groove is opposite to the protrusion direction of the second groove; one end of the first groove is connected to the second groove, and the other end of the first groove is close to the middle of the fan-shaped area.

[0011] According to the second aspect of the embodiments of the present specification, an iron frame structure is provided, which includes a base, a seat frame, a main driving member, a main transmission member, a leg extension device and a driving motor; the seat frame is slidably arranged on the base, and the two ends of the driving motor are respectively rotatably connected with the base and the main driving member; a seat frame connecting plate is provided on the seat frame, and the main driving member and the main transmission member are both rotatably mounted on the seat frame connecting plate; the main driving member is hinged to the driving motor and the leg extension device; the main transmission member is hinged to the transmission connecting rod arranged on the base, and a limiting structure is provided between the main driving member and the main transmission member so that the main driving member and the main transmission member can rotate separately, so that the driving motor can drive the leg extension device and the seat frame separately in sections.

[0012] Furthermore, the driving process of the driving motor includes three stages. In the first stage, the leg stretching device and the seat frame are driven to move simultaneously. In the second stage, the leg stretching device is driven to extend and retract independently. In the third stage, the seat frame is driven to rise and fall independently.

[0013] Furthermore, the main driving member has a first rotation range and a second rotation range relative to the seat frame connecting plate; the main transmission member has a third rotation range and a fourth rotation range relative to the seat frame connecting plate; in the first section, the main driving member and the main transmission member rotate in the first rotation range and the third rotation range respectively; in the second section, the main driving member rotates in the second rotation range; in the third section, the main transmission member rotates in the fourth rotation range.

[0014] Further, the limiting structure includes a limiting connection portion provided on the main driving member and a limiting groove provided on the main transmission member, and the limiting connection portion and the limiting groove are slidably matched.

[0015] Furthermore, the limiting groove includes a first groove and a second groove that are connected; in the first section and the second section, the limiting connection part cooperates with the first groove; in the third section, the limiting connection part cooperates with the second groove.

[0016] Furthermore, the main driving component also includes a fixedly connected seat frame connection part, a driving connection part and a leg support connection part; the driving connection part, the leg support connection part and the limiting connection part can rotate around the seat frame connection part; the main transmission component also includes a seat frame hinge part and a connecting rod hinge part.

[0017] Furthermore, the seat frame connecting portion and the seat frame hinge portion are respectively hinged to the seat frame connecting plate, and the main driving member and the main transmission member have opposite rotation directions.

[0018] Furthermore, the main driving component includes a driving plate, a driving connecting tube and a motor connecting frame; the driving plate and the motor connecting frame are both perpendicular to and fixed to the driving connecting tube; the leg support connecting part and the limiting connecting part are arranged on the driving plate; the seat frame connecting part is arranged on the driving connecting tube; and the driving connecting part is arranged on the motor connecting frame.

[0019] Furthermore, on the circumference of the drive connecting tube, the limiting connecting portion and the leg support connecting portion form an acute angle.

[0020] Furthermore, the main transmission member includes a transmission rod and a transmission plate that are fixedly connected, the seat frame hinge part and the connecting rod hinge part are respectively arranged at two ends of the transmission rod; the first groove and the second groove are arranged on the transmission plate.

[0021] Furthermore, the first groove and the second groove are both arc-shaped, the second groove and the seat frame hinge form a fan-shaped area, the first groove is located in the fan-shaped area, and the protrusion direction of the first groove is opposite to the protrusion direction of the second groove; one end of the first groove is connected to the second groove, and the other end of the first groove is close to the middle of the fan-shaped area.

[0022] Furthermore, the leg extension device includes a leg support driving rod and a leg support connecting rod mechanism, the leg support connecting rod mechanism includes a large foot pedal connecting rod device and a small foot pedal connecting rod device, the two ends of the leg support driving rod are respectively hinged to the leg support connecting part and the large foot pedal connecting rod device, and the small foot pedal connecting rod device is hinged to the large foot pedal connecting rod device; when folded, the distance between the small foot pedal connecting rod device and the ground is 12cm-16cm.

[0023] Furthermore, the seat frame includes two first side frames, a first front cross bar and a first rear cross bar, the two first side frames are symmetrically arranged and respectively connected by the first front cross bar and the first rear cross bar; the seat frame connecting plate is located in the middle of the first side frame.

[0024] Furthermore, the base is provided with a front track and a rear track, the front track extends in an arc shape along the length direction of the base with a gradually decreasing slope, and the rear track extends horizontally along the length direction of the base; the seat frame is provided with a front roller matched with the front track and a rear roller matched with the rear track; wherein the front roller is located on the seat frame connecting plate;

[0025] The base comprises two second side frames, a second rear cross bar and a cross tube, the two second side frames are symmetrically arranged and connected through the second rear cross bar and the cross tube, and the transmission connecting rod is hinged between the front track and the rear track.

[0026] According to a third aspect of an embodiment of the present specification, a seat is provided, comprising the telescopic transmission device described in the first aspect or the iron frame structure described in the second aspect.

[0027] The present application has the following beneficial effects: the telescopic transmission device of the present application includes a main driving member and a main driven member, and the main driving member and the main transmission member can be rotated separately through the cooperation of the limiting connection part and the limiting groove. After the telescopic transmission device is assembled with the driving motor, the leg stretching device and the seat frame, when the main driving member rotates alone, it only drives the leg stretching device to realize the switching between the sitting posture and the TV posture; when the main transmission member rotates alone, it drives the seat frame to realize the switching between the lying posture and the TV posture; thus, the switching of the three postures can be realized by a single motor drive.

[0028] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0030] Figure 1 It is a schematic diagram of the iron frame structure of the present application in a sitting position;

[0031] Figure 2 It is a schematic diagram of the opening process of the iron frame structure of the present application;

[0032] Figure 3 This is a schematic diagram of the iron frame structure of the present application in TV posture;

[0033] Figure 4It is a schematic diagram of the iron frame structure of the present application in a lying position;

[0034] Figure 5 yes Figure 4 A top view of

[0035] Figure 6 yes Figure 4 Side view of

[0036] Figure 7 yes Figure 5 Sectional view at AA in the middle;

[0037] Figure 8 It is a structural schematic diagram of the driving plate and the transmission plate in the iron frame structure of the present application;

[0038] Fig. 9 It is a structural schematic diagram of a transmission plate in the iron frame structure of the present application;

[0039] Fig.10 It is a structural schematic diagram of the driving plate in the iron frame structure of the present application;

[0040] Fig.11 It is a structural schematic diagram of the main driving member and the seat frame connecting plate in the iron frame structure of the present application;

[0041] Fig.12 It is a partial schematic diagram of the iron frame structure of the present application in a sitting position;

[0042] Fig.13 It is a partial schematic diagram of the opening process of the iron frame structure of the present application;

[0043] Fig.14 This is a partial schematic diagram of the iron frame structure of the present application in TV posture;

[0044] Fig.15 It is a partial schematic diagram of the iron frame structure of the present application in a lying position.

[0045] Description of reference numerals:

[0046] 10-base; 11-transmission connecting rod; 12-front track; 13-rear track; 14-second side frame; 15-second rear cross bar; 16-cross tube;

[0047] 20-seat frame; 21-seat frame connecting plate; 22-first side frame; 23-first front cross bar; 24-first rear cross bar; 25-front roller; 26-rear roller;

[0048] 30-main driving member; 31-driving plate; 311-leg support connecting part; 312-limit connecting part; 32-driving connecting pipe; 321-seat frame connecting part; 33-motor connecting frame; 331-driving connecting part;

[0049] 40-main transmission member; 41-transmission rod; 411-seat frame hinge; 412-connecting rod hinge; 42-transmission plate; 420-limiting groove; 421-first groove; 422-second groove;

[0050] 50-leg extension device; 51-leg support driving rod; 511-notch; 52-leg support connecting rod mechanism; 521-large pedal connecting rod device; 522-small pedal connecting rod device;

[0051] 60-driving motor; 61-main body; 62-motor rod;

[0052] 70 - backrest extension device; 71 - first connecting rod; 72 - second connecting rod; 73 - backrest member; 74 - third connecting rod. DETAILED DESCRIPTION

[0053] Here, the technical solutions in the embodiments (or "implementations") of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0054] If there are terms involving directional indications or positional relationships in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only used for the purpose of convenience of description and cannot be understood as indicating or implying relative importance.

[0055] Next, the embodiments of this specification are described in detail.

[0056] Reference Figures 1 to 11 As shown, the present application discloses an iron frame structure, which includes a base 10 , a seat frame 20 , a main driving member 30 , a main transmission member 40 , a leg extension device 50 , a driving motor 60 and a backrest extension device 70 .

[0057] The seat frame 20, the main driving member 30, the main transmission member 40, the leg extension device 50, the driving motor 60 and the backrest extension device 70 are installed on the base 10. The seat frame 20 is slidably arranged on the base 10, the driving motor 60 drives the main driving member 30 to move, the main driving member 30 drives the main transmission member 40 to rotate and the leg extension device 50 to extend and retract, and the main transmission member 40 rotates while driving the seat frame 20 to rise and fall and the backrest extension device 70 to unfold.

[0058] The base 10 includes a transmission connecting rod 11, a front rail 12, a rear rail 13, two second side frames 14, a second rear cross bar 15 and a cross tube 16. The two second side frames 14 are symmetrically arranged and connected by the second rear cross bar 15 and the cross tube 16. The cross tube 16 is arranged at the rear position of the front end of the second side frame 14 and extends downward, which can avoid the parts above the cross tube 16 and strengthen the structural strength of the base 10.

[0059] The front track 12 extends in an arc shape and gradually rises from the back to the front. The rear track 13 extends horizontally along the length direction of the base 10. The transmission connecting rod 11 is hinged below the front end of the rear track 13.

[0060] The seat frame 20 includes two seat frame connecting plates 21, two first side frames 22, a first front cross bar 23, a first rear cross bar 24, a front roller 25 and a rear roller 26. The two seat frame connecting plates 21 are respectively arranged on the inner side of the middle of the two first side frames 22. The two first side frames 22 are symmetrically arranged and connected by the first front cross bar 23 and the first rear cross bar 24 respectively.

[0061] In another embodiment, the two seat frame connecting plates 21 are respectively disposed on the inner sides of the middle portions of the two first side frames 22 , and the two seat frame connecting plates 21 and the two first side frames 22 are integrally formed.

[0062] Front rollers 25 are provided on the two seat frame connecting plates 21, and rear rollers 26 are provided on the two first side frames 22. The front rollers 25 cooperate with the front track 12, and the rear rollers 26 cooperate with the rear track 13.

[0063] The main driving member 30 includes a driving plate 31, a driving connecting pipe 32 and a motor connecting frame 33. The driving plate 31 and the motor connecting frame 33 are both perpendicular to and fixed to the driving connecting pipe 32, and the motor connecting frame 33 and the driving plate 31 are arranged in sequence from the inside to the outside.

[0064] The driving plate 31 is V-shaped, and the two ends of the driving plate 31 are respectively a leg support connection part 311 and a limit connection part 312. In the circumferential direction of the driving connection tube 32, the limit connection part 312 on the driving plate 31 and the leg support connection part 311 form an acute angle. The length of the leg support connection part 311 is greater than the length of the limit connection part 312. Among them, in order to connect with the leg extension device 50, the middle bend of the leg support connection part 311 is not in the same plane as the limit connection part 312.

[0065] In other embodiments, the driving plate 31 is fan-shaped, square-shaped, etc. The shape can be adjusted in combination with components beside the driving plate 31, and is not limited here.

[0066] The driving connecting tube 32 is provided with a seat frame connecting portion 321, and the seat frame connecting portion 321 is hinged to the seat frame connecting plate 21. Specifically, both ends of the driving connecting tube 32 pass through the driving plate 31 and are hinged to the seat frame connecting plate 21.

[0067] The motor connecting frame 33 is provided with a driving connecting portion 331, and the driving motor 60 is rotatably connected to the driving connecting portion 331. The motor connecting frame 33 is located between the limiting connecting portion 312 and the leg support connecting portion 311. The length of the motor connecting frame 33 is greater than the length of the limiting connecting portion 312 and less than the length of the leg support connecting portion 311.

[0068] In the illustrated embodiment, the main driving component 30 includes a three-part structure of a driving plate 31, a driving connecting tube 32 and a motor connecting frame 33. However, in other embodiments, the structural form of the main driving component 30 can be a variety of combinations, and it is only necessary to ensure that the main driving component 30 can provide four connecting structures including a leg support connecting part 311, a limiting connecting part 312, a seat frame connecting part 321 and a driving connecting part 331.

[0069] The main transmission member 40 includes a transmission rod 41 and a transmission plate 42 that are fixedly connected. The two ends of the transmission rod 41 are respectively provided with a seat frame hinge part 411 and a connecting rod hinge part 412, and a limiting groove 420 is provided on the transmission plate 42. The limiting connection part 312 cooperates with the limiting groove 420. Since the seat frame hinge part 411 and the seat frame connection part 32 are both hinged to the seat frame connection plate 21, the seat frame connection part 321 moves synchronously with the seat frame hinge part 411.

[0070] The limiting groove 420 includes a first groove 421 and a second groove 422 which are connected. The first groove 421 and the second groove 422 are both arc-shaped, and the second groove 422 and the seat frame hinge portion 411 form a fan-shaped area. The first groove 421 is located in the fan-shaped area, and the protrusion direction of the first groove 421 is opposite to the protrusion direction of the second groove 422. One end of the first groove 421 is connected to the second groove 422, and the other end of the first groove 421 is close to the middle of the fan-shaped area.

[0071] In the illustrated embodiment, the transmission member 40 includes a transmission rod 41 and a transmission plate 42 fixed to each other, but the structure of the transmission member 40 is not limited thereto and may also be in other forms, such as the transmission rod and the transmission plate may be an integrally formed structure. It is only necessary to ensure the relative positional relationship between the seat frame hinge 411, the connecting rod hinge 412 and the limiting groove 420.

[0072] The leg extension device 50 includes a leg support driving rod 51 and a leg support connecting rod mechanism 52. The leg support connecting rod mechanism 52 includes a large pedal connecting rod device 521 and a small pedal connecting rod device 522. The small pedal connecting rod device 522 is hinged to the large pedal connecting rod device 521. Both ends of the leg support driving rod 51 are hinged to the leg support connecting portion 311 and the large pedal connecting rod device 521, respectively.

[0073] When the leg extension device 50 is folded, the iron frame structure of the present application can achieve a distance of 12cm-16cm between the small pedal connecting rod device 522 and the ground, having a higher distance from the ground, while preventing the small pedal connecting rod device 522 from colliding with the bottom surface during the opening process.

[0074] A notch 511 is provided on the leg support driving rod 51, and the notch 511 is adapted to the outer contour of the driving connecting tube 32, thereby making way for the driving connecting tube 32 to avoid collision between the two during rotation.

[0075] The driving motor 60 includes a main body 61 and a telescopic motor rod 62. The two ends of the driving motor 60 are respectively connected to the base 10 and the main driving member 30 for rotation, thereby driving the leg extension device 50 to extend and retract and the seat frame 20 to rise and fall. The motor rod 62 is in a continuously extended state during the switching process from the sitting position to the lying position.

[0076] The drive motor 60 is disposed biased toward one of the second side frames 14, and the motor connecting frame 33 is disposed close to the second side frame 14. The driving force of the drive motor 60 is output in the form of torque, and the biased drive motor 60 avoids deformation of the drive connecting pipe 32 when subjected to force, especially when the span of the drive connecting pipe 32 is relatively large, thereby ensuring the stability of the iron frame structure, increasing the service life and reducing the maintenance frequency.

[0077] The backrest extension device 70 includes a first link 71 and a second link 72 respectively hinged to the second side frame 14, a backrest member 73 hinged between the first link 71 and the second link 72, and a third link 74, and the backrest is fixed on the backrest member 73. The base 10, the first link 71, the second link 72 and the backrest member 73 form a four-bar linkage, and the third link 74 is rotatably connected between the first link 71 and the seat frame 20.

[0078] The movement of the iron frame structure is described below. The driving process of the driving motor 60 includes three stages. In the first stage, the leg stretching device 50 and the seat frame 20 are driven to move simultaneously. In the second stage, the leg stretching device 50 is driven to extend and retract independently. In the third stage, the seat frame 20 is driven to rise and fall independently.

[0079] Reference Fig.12 As shown, the iron frame structure is in a sitting position, at which time, the driving plate 31 and the transmission plate 42 partially overlap, the driving plate 31 and the transmission plate 42 are located at the rear end of the driving connecting tube 32, the leg extension device 50 is located at the front end of the driving connecting tube 32, the leg support driving rod 51 extends from the rear end of the driving connecting tube 32 to the front end of the driving connecting tube 32, and more than half of the length of the leg support driving rod 51 is located at the front end of the driving connecting tube 32. In addition, the seat frame 20 is located at the highest position, the base 10 is located at the lowest position, and the leg extension device 50 is located between the two.

[0080] When the driving motor 60 drives the telescopic transmission device to open, in the first stage, the limit connection part 312 slides from the connection point between the first groove 421 and the second groove 422 to the other end of the first groove 421, and the main transmission member 40 and the main driving member 30 both move and rotate, the leg extension device 50 is partially extended, and the seat frame 20 is partially lifted. The main driving member 30 and the main driving member 40 rotate in opposite directions, that is, the main driving member 30 rotates counterclockwise and the main driving member 40 rotates clockwise. The iron frame structure is converted from a sitting position to a partially opened state, and moves to Fig.13 Position shown.

[0081] In the partially open state, the driving plate 31 and the transmission plate 42 partially overlap, and the overlapping area is larger than that in the sitting state. The driving plate 31 and the transmission plate 42 are located at the rear end of the driving connecting tube 32, the leg extension device 50 is located at the front end of the driving connecting tube 32, the leg support driving rod 51 extends from the rear end of the driving connecting tube 32 to the front end of the driving connecting tube 32, and more than half of the length of the leg support driving rod 51 is located at the front end of the driving connecting tube 32. In addition, the seat frame 20 is located at the highest position, the leg extension device 50 is located at the lowest position, and the base 10 is located between the two.

[0082] Then, as the motor rod further extends and enters the second section, the position-limiting connection part 312 slides in the first groove 421 in the opposite direction until it slides to the connection point between the first groove 421 and the second groove 422. Due to the cooperation between the position-limiting connection part 312 and the first groove 421, the main transmission member 40 and the seat frame connection plate 21 remain stationary during this process, and only the main driving member 30 rotates counterclockwise, driving the leg extension device 50 to continue to extend until it is fully opened to reach the TV posture, as shown in FIG. Fig.14 shown.

[0083] In the TV posture, the driving plate 31 and the transmission plate 42 partially overlap, and the overlapping area is reduced compared to the partially open state. The transmission plate 42 is located at the rear end of the driving connecting tube 32, the leg support connection part 311 on the driving plate 31 is located at the front end of the driving connecting tube 32, the limit connection part 312 on the driving plate 31 is located at the rear end of the driving connecting tube 32, and the leg support driving rod 51 is completely located at the front end of the driving connecting tube 32. In addition, the leg extension device 50 is located at the highest position, the base 10 is located at the lowest position, and the seat frame 20 is located between the two.

[0084] If the motor rod 62 continues to extend, it enters the third stage. The limit connection part 312 slides in the second groove 422, and the main driving member 30 only moves with the seat frame connecting plate 21 but does not rotate. The main transmission member 40 moves with the seat frame connecting plate 21 and also rotates clockwise. The driving motor 60 drives the seat frame 20 to the highest position through the connection between the main driving member 30 and the main transmission member 40 and the seat frame connecting plate 21, so as to achieve a lying position. Fig.15 shown.

[0085] In the lying position, the driving plate 31 and the transmission plate 42 are partially separated, the transmission plate 42 is located at the rear end of the driving connecting tube 32, the leg support connection part 311 on the driving plate 31 is located at the front end of the driving connecting tube 32, the limiting connection part 312 on the driving plate 31 is located at the rear end of the driving connecting tube 32, and the leg support driving rod 51 is completely located at the front end of the driving connecting tube 32. In addition, the leg extension device 50 is located at the highest position, the base 10 is located at the lowest position, and the seat frame 20 is located between the two.

[0086] The above process is the complete opening process of the iron frame structure. The movement of each component during the closing process is opposite to the opening process, so it will not be described in detail here.

[0087] The main driving member 30 has a first rotation range and a second rotation range relative to the seat frame connecting plate 21, and the main transmission member 40 has a third rotation range and a fourth rotation range relative to the seat frame connecting plate 21. During the opening process, the main driving member 30 rotates in the counterclockwise direction, and the main transmission member 40 rotates in the clockwise direction. The main driving member 30 rotates in the first rotation range in the first section, and rotates in the second rotation range in the second section. The main transmission member 40 rotates in the third rotation range in the first section, and rotates in the fourth rotation range in the third section.

[0088] According to other embodiments of the present application, the driving process of the driving motor 60 may also include only two stages, that is, the first stage in which the main transmission member 40 and the main driving member 30 move and rotate, the leg extension device 50 is partially extended, and the seat frame 20 is partially lifted may not be included. That is, the driving motor 60 can directly switch from the sitting position to the TV position, and then switch from the TV position to the lying position, omitting the process in which the iron frame structure is switched from the sitting position to the leg extension device 50 and the seat frame 20 are partially opened.

[0089] The main driving member 30 and the main transmission member 40 form a telescopic transmission device, which is applied to the iron frame structure and seat of the present application. The telescopic transmission device includes the movement of the main driving member 30 and the main transmission member 40, and the main driving member 30 and the main transmission member 40 can be rotated separately through the cooperation of the limit connection part 312 and the limit groove 420. After the telescopic transmission device is assembled with the drive motor 60, the leg extension device 50 and the seat frame 20, the main driving member 30 can drive the leg extension device 50 to expand separately and switch from a sitting position to a TV position; when the main transmission member 40 rotates separately, it drives the seat frame 20 to switch to a lying position again; thereby, it is possible to switch between the three postures of sitting, TV and lying by driving a single drive motor 60.

[0090] The present application also discloses a seat, comprising the above-mentioned telescopic transmission device or iron frame structure.

[0091] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without causing conflicts. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A telescopic transmission device, characterized in that: It includes a main driving member and a main transmission member; the main driving member includes a leg support connection part, a limiting connection part, a seat frame connection part and a driving connection part, and the driving connection part, the leg support connection part and the limiting connection part can rotate around the seat frame connection part; the main transmission member includes a seat frame hinge part, a connecting rod hinge part and a limiting groove, and the connecting rod hinge part and the limiting groove can rotate around the seat frame hinge part; the seat frame connection part moves synchronously with the seat frame hinge part; the limiting connection part cooperates with the limiting groove to enable the main driving member and the main transmission member to rotate separately.

2. The telescopic transmission device according to claim 1, characterized in that: The limiting groove includes a first groove and a second groove that are connected to each other; when the limiting connection part cooperates with the first groove, the main transmission member can remain fixed and only the main driving member rotates; when the limiting connection part cooperates with the second groove, the main driving member can remain fixed and only the main transmission member rotates.

3. The telescopic transmission device according to claim 1, characterized in that: The main driving component includes a driving plate, a driving connecting tube and a motor connecting frame; the driving plate and the motor connecting frame are both perpendicular to and fixed to the driving connecting tube; the leg support connecting part and the limiting connecting part are arranged on the driving plate; the seat frame connecting part is arranged on the driving connecting tube; the driving connecting part is arranged on the motor connecting frame.

4. The telescopic transmission device according to claim 3, characterized in that: In the circumferential direction of the driving connecting tube, the limiting connecting portion and the leg support connecting portion form an acute angle.

5. The telescopic transmission device according to claim 2, characterized in that: The main transmission member includes a transmission rod and a transmission plate that are fixedly connected, the seat frame hinge part and the connecting rod hinge part are respectively arranged at two ends of the transmission rod; the first groove and the second groove are arranged on the transmission plate.

6. The telescopic transmission device according to claim 5, characterized in that: The first groove and the second groove are both arc-shaped, the second groove and the seat frame hinge form a fan-shaped area, the first groove is located in the fan-shaped area, the protrusion direction of the first groove is opposite to the protrusion direction of the second groove; one end of the first groove is connected to the second groove, and the other end of the first groove is close to the middle of the fan-shaped area.

7. An iron frame structure, characterized in that: It includes a base, a seat frame, a main driving member, a main transmission member, a leg extension device and a driving motor; the seat frame is slidably arranged on the base, and the two ends of the driving motor are respectively rotatably connected with the base and the main driving member; a seat frame connecting plate is provided on the seat frame, and the main driving member and the main transmission member are both rotatably mounted on the seat frame connecting plate; the main driving member is hinged to the driving motor and the leg extension device; the main transmission member is hinged to the transmission connecting rod arranged on the base, and a limiting structure is provided between the main driving member and the main transmission member so that the main driving member and the main transmission member can rotate separately, so that the driving motor can drive the leg extension device and the seat frame separately in sections.

8. The iron frame structure according to claim 7, characterized in that: The driving process of the driving motor includes three stages. In the first stage, the leg stretching device and the seat frame are driven to move simultaneously. In the second stage, the leg stretching device is driven to extend and retract independently. In the third stage, the seat frame is driven to rise and fall independently.

9. The iron frame structure according to claim 8, characterized in that: The main driving member has a first rotation range and a second rotation range relative to the seat frame connecting plate; the main transmission member has a third rotation range and a fourth rotation range relative to the seat frame connecting plate; In the first section, the main driving member and the main transmission member rotate in the first rotation range and the third rotation range respectively; in the second section, the main driving member rotates in the second rotation range; In the third section, the main transmission member rotates within the fourth rotation range.

10. The iron frame structure according to claim 8, characterized in that: The limiting structure comprises a limiting connection portion arranged on the main driving member and a limiting groove arranged on the main transmission member, and the limiting connection portion and the limiting groove are slidably matched.

11. The iron frame structure according to claim 10, characterized in that: The limiting groove includes a first groove and a second groove that are connected to each other; in the first section and the second section, the limiting connection part cooperates with the first groove; in the third section, the limiting connection part cooperates with the second groove.

12. The iron frame structure according to claim 11, characterized in that: The main driving component also includes a fixedly connected seat frame connection part, a driving connection part and a leg support connection part; the driving connection part, the leg support connection part and the limiting connection part can rotate around the seat frame connection part; the main transmission component also includes a seat frame hinge part and a connecting rod hinge part.

13. The iron frame structure according to claim 12, characterized in that: The seat frame connecting portion and the seat frame hinged portion are respectively hinged to the seat frame connecting plate, and the main driving member and the main transmission member rotate in opposite directions.

14. The iron frame structure according to claim 12, characterized in that: The main driving component includes a driving plate, a driving connecting tube and a motor connecting frame; the driving plate and the motor connecting frame are both perpendicular to and fixed to the driving connecting tube; the leg support connecting part and the limiting connecting part are arranged on the driving plate; the seat frame connecting part is arranged on the driving connecting tube; the driving connecting part is arranged on the motor connecting frame.

15. The iron frame structure according to claim 14, characterized in that: In the circumferential direction of the driving connecting tube, the limiting connecting portion and the leg support connecting portion form an acute angle.

16. The iron frame structure according to claim 12, characterized in that: The main transmission member includes a transmission rod and a transmission plate that are fixedly connected, the seat frame hinge part and the connecting rod hinge part are respectively arranged at two ends of the transmission rod; the first groove and the second groove are arranged on the transmission plate.

17. The iron frame structure according to claim 12, characterized in that: The first groove and the second groove are both arc-shaped, the second groove and the seat frame hinge form a fan-shaped area, the first groove is located in the fan-shaped area, the protrusion direction of the first groove is opposite to the protrusion direction of the second groove; one end of the first groove is connected to the second groove, and the other end of the first groove is close to the middle of the fan-shaped area.

18. The iron frame structure according to claim 12, characterized in that: The leg extension device includes a leg support driving rod and a leg support connecting rod mechanism, the leg support connecting rod mechanism includes a large foot pedal connecting rod device and a small foot pedal connecting rod device, the two ends of the leg support driving rod are respectively hinged to the leg support connecting part and the large foot pedal connecting rod device, and the small foot pedal connecting rod device is hinged to the large foot pedal connecting rod device; when folded, the distance between the small foot pedal connecting rod device and the ground is 12cm-16cm.

19. The iron frame structure according to claim 7, characterized in that: The seat frame comprises two first side frames, a first front cross bar and a first rear cross bar. The two first side frames are symmetrically arranged and respectively connected by the first front cross bar and the first rear cross bar. The seat frame connecting plate is located in the middle of the first side frame.

20. The iron frame structure according to claim 7, characterized in that: The base is provided with a front track and a rear track, the front track extends in an arc shape along the length direction of the base and the slope gradually decreases, and the rear track extends horizontally along the length direction of the base; the seat frame is provided with a front roller matched with the front track and a rear roller matched with the rear track; wherein the front roller is located on the seat frame connecting plate; The base comprises two second side frames, a second rear cross bar and a cross tube, the two second side frames are symmetrically arranged and connected through the second rear cross bar and the cross tube, and the transmission connecting rod is hinged between the front track and the rear track.

21. A seat, characterized in that: It comprises the telescopic transmission device described in any one of claims 1 to 6 or the iron frame structure described in any one of claims 7 to 20.

Images