Large-angle stretching functional iron stand and seat

Abstract

The utility model belongs to the technical field of seats, and discloses a large-angle stretching functional iron stand and a seat, the large-angle stretching functional iron stand comprises a bottom frame, a seat frame and a backrest assembly, the backrest assembly comprises a first connecting rod, a second connecting rod, a linkage part and a backrest rod; the first connecting rod is located on the front side of the second connecting rod, the first end of the first connecting rod and the first end of the second connecting rod are hinged to the bottom frame at intervals, and the second end of the first connecting rod and the second end of the second connecting rod are hinged to the backrest rod at intervals. One end of the linkage part is hinged to the seat frame, and the other end of the linkage part is hinged between the two ends of the second connecting rod; the seat comprises the iron stand with the large-angle stretching function, when the seat frame stretches forwards, the linkage part drives the second connecting rod, the second end of the second connecting rod rotates forwards around the first end of the second connecting rod, the hinge point of the backrest rod and the second connecting rod is close to the first connecting rod, and therefore large-angle rotation of the backrest assembly relative to the seat frame is achieved; and the experience performance in the lying posture state is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of seats, in particular to an iron frame with a large-angle extension function and a seat. Background Art

[0002] Nowadays, functional chairs can switch between lying, TV and sitting positions, and are becoming more and more popular among users.

[0003] The functional chair in the prior art generally comprises a footrest extension assembly, a middle seat frame and a backrest assembly, wherein the footrest extension assembly is extended by a motor, and the footrest extension assembly stops extending after reaching the desired position; at this time, the motor continues to run, and the footrest extension assembly stops extending while driving the seat frame to move forward, and drives the backrest assembly to move forward, and this process causes the angle of the backrest assembly to change, so that the angle of the backrest assembly can be adjusted within a certain angle range; the whole process can switch the functional chair from a sitting position to a TV position (only the footrest extension assembly is extended) or a lying position (the footrest extension assembly is extended and the angle of the backrest assembly changes);

[0004] However, the adjustment angle of the backrest assembly in the prior art is relatively limited, which makes the functional seat have a poor experience in the lying state. Utility Model Content

[0005] The purpose of the utility model is to provide an iron frame and a seat with a large-angle extension function, which can increase the adjustment angle of the backrest component and improve the experience performance in a lying state.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Large-angle extension functional iron frame, including:

[0008] chassis frame;

[0009] A seat frame, the seat frame being capable of moving forwardly extending or backwardly retracting relative to the chassis frame;

[0010] A backrest assembly, the backrest assembly comprising:

[0011] Backrest rod;

[0012] A first connecting rod and a second connecting rod, wherein the first connecting rod is located in front of the second connecting rod, a first end of the first connecting rod and a first end of the second connecting rod are hinged to the bottom frame at intervals, and a second end of the first connecting rod and a second end of the second connecting rod are hinged to the backrest rod at intervals;

[0013] A linkage part, one end of which is hinged to the seat frame, and the other end of which is hinged between two ends of the second connecting rod.

[0014] Preferably, a second limiting portion is provided on the first connecting rod to limit the rotation angle of the backrest rod.

[0015] Preferably, the linkage portion includes a third link and a fourth link, the first end of the third link is hinged to the first end of the fourth link, the second end of the third link is hinged to the seat frame, and the second end of the fourth link is hinged between the two ends of the second link.

[0016] Preferably, a first limiting portion is provided on the fourth connecting rod, and the first limiting portion can abut against the third connecting rod to limit the first end of the fourth connecting rod from rotating downward.

[0017] Preferably, a third limiting portion is provided on the second connecting rod, and the third limiting portion can abut against the fourth connecting rod to limit the second end of the second connecting rod from rotating forward.

[0018] Preferably, the angle between the third connecting rod and the fourth connecting rod is b, and the variation range of b is 0°<b≤180°.

[0019] Preferably, the backrest rod includes a cross bar portion and a longitudinal bar portion, one end of the longitudinal bar portion is connected between the two ends of the cross bar portion, the other end of the longitudinal bar portion extends away from the cross bar portion, and the second end of the first connecting rod and the second end of the second connecting rod are respectively hinged to the two ends of the cross bar portion.

[0020] Preferably, the angle between the longitudinal rod portion and the seat frame is a; the variation range of a is 105°≤a≤160°.

[0021] Preferably, a protrusion is provided at the first end of the second connecting rod, and the protrusion extends in a direction away from the second end of the second connecting rod. A first connecting member is provided on the base frame, and the first connecting member is located at the front side of the protrusion. An elastic member is connected between the first connecting member and the protrusion, and the elastic member can store energy when the seat frame extends forward.

[0022] The seat comprises a footrest extension component and the large-angle extension functional iron frame as described above, wherein the footrest extension component is connected to the front end of the seat frame.

[0023] Beneficial effects of the utility model:

[0024] When the seat frame extends forward, the seat frame drives the linkage part to move forward. As the base frame continues to move, the linkage part drives the second connecting rod, so that the second end of the second connecting rod rotates forward around the first end of the second connecting rod, thereby enabling the hinged end of the backrest rod and the second connecting rod to rotate around the hinged end of the backrest rod and the first connecting rod, and also makes the hinge point of the backrest rod and the second connecting rod close to the first connecting rod, thereby realizing a large-angle rotation of the backrest assembly relative to the seat frame, thereby improving the experience performance in the lying state. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the utility model's large-angle extension function iron frame in a sitting position;

[0026] Figure 2 It is a partial schematic diagram of the backrest assembly of the utility model in a sitting position;

[0027] Figure 3 It is a schematic diagram of the utility model's large-angle extension functional iron frame in TV posture;

[0028] Figure 4 It is a partial schematic diagram of the backrest assembly of the utility model in the TV posture;

[0029] Figure 5 It is a schematic diagram of the utility model's large-angle extension function iron frame in a lying position;

[0030] Figure 6 It is a partial schematic diagram of the backrest assembly of the utility model when in a lying position;

[0031] Figure 7 It is a schematic diagram of the third connecting rod and the fourth connecting rod of the utility model in a sitting position;

[0032] Figure 8 It is a schematic diagram of the third connecting rod and the fourth connecting rod of the utility model in the TV posture;

[0033] Fig. 9 It is a schematic diagram of the third connecting rod and the fourth connecting rod of the utility model when the utility model is in a lying position.

[0034] In the figure:

[0035] 1. chassis frame; 2. seat frame; 3. backrest assembly; 31. backrest rod; 311. crossbar; 312. longitudinal rod; 32. first connecting rod; 33. second connecting rod; 331. protruding part; 34. third connecting rod; 35. fourth connecting rod; 36. first limiting part; 37. second limiting part; 38. third limiting part;

[0036] 4. Fourth limiting part; 5. First connecting member; 6. Second connecting member; 7. Elastic member; 8. Fifth limiting part; 9. Footrest extension assembly. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper", "lower", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplified operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] like Figures 1 to 9 As shown, the utility model provides an iron frame with a large-angle extension function, which includes a base frame 1, a seat frame 2 and a backrest assembly 3, the backrest assembly 3 includes a first connecting rod 32, a second connecting rod 33, a linkage part and a backrest rod 31; the first connecting rod 32 is located on the front side of the second connecting rod 33, the first end of the first connecting rod 32 and the first end of the second connecting rod 33 are hinged to the base frame 1 at an interval, and the second end of the first connecting rod 32 and the second end of the second connecting rod 33 are hinged to the backrest rod 31 at an interval; one end of the linkage part is hinged to the seat frame 2, and the other end of the linkage part is hinged between the two ends of the second connecting rod 33.

[0042] When converting from TV posture to lying posture, the large-angle extension function iron frame extends forward relative to the base frame 1 through the seat frame 2. In the TV posture state, the first connecting rod 32 and the second connecting rod 33 jointly support the backrest rod 31. When the seat frame 2 extends forward, the seat frame 2 drives the linkage part to move forward. As the seat frame 2 continues to move, the linkage part drives the second connecting rod 33, so that the second end of the second connecting rod 33 rotates forward around the first end of the second connecting rod 33, so that the hinged end of the backrest rod 31 and the second connecting rod 33 can rotate around the hinged end of the backrest rod 31 and the first connecting rod 32, so that the hinge point of the backrest rod 31 and the second connecting rod 33 is close to the first connecting rod 32, thereby realizing a large-angle rotation of the backrest assembly 3 relative to the seat frame 2, thereby improving the experience performance in the lying position.

[0043] It should be noted that the seat frame 2 and the chassis frame 1 are both based on the prior art and will not be described in detail. The backrest assembly 3 is provided in two groups, and the two groups of backrest assemblies 3 are arranged opposite to each other; and it should be further noted that the front and rear in the present invention are based on the forward and backward movement directions of the seat frame 2; and the upper and lower are based on the upper and lower directions of the seat frame 2.

[0044] In the current embodiment, the backrest rod 31 includes a crossbar portion 311 and a longitudinal rod portion 312, one end of the longitudinal rod portion 312 is connected between the two ends of the crossbar portion 311, and the other end of the longitudinal rod portion 312 extends in a direction away from the crossbar portion 311, and the second end of the first connecting rod 32 and the second end of the second connecting rod 33 are respectively hinged to the two ends of the crossbar portion 311. Exemplarily, the crossbar portion 311 and the longitudinal rod portion 312 are integrally formed in a T-shape, the crossbar portion 311 is used to support the longitudinal rod portion 312, and the longitudinal rod portion 312 is used to install external backrest cushions and other components. Assuming that the angle between the longitudinal rod portion 312 and the seat frame 2 is a, when the linkage portion pulls the second connecting rod 33, the angle a between the longitudinal rod portion 312 and the seat frame 2 changes, and the range of a change is 105°≤a≤160°, that is, when in a lying state, the maximum opening angle of the backrest assembly 3 can reach 160°.

[0045] like Figure 3 and Figure 5 As shown, in some embodiments, the first link 32 is provided with a second limiting portion 37, and the second limiting portion 37 is provided protruding from the first link 32. When the linkage portion pulls the second link 33 to make the cross bar 311 close to the first link 32, the cross bar 311 can abut against the second limiting portion 37, thereby limiting the cross bar 311 from continuing to move, and also limiting the excessive rotation of the longitudinal bar 312. Exemplarily, the second limiting portion 37 is a limiting protrusion or a connecting rivet.

[0046] like Figure 4 , Figure 7 , Figure 8 as well as Fig. 9 As shown, in some embodiments, the linkage portion includes a third link 34 and a fourth link 35, the first end of the third link 34 is hinged to the first end of the fourth link 35, the second end of the third link 34 is hinged to the seat frame 2, and the second end of the fourth link 35 is hinged between the two ends of the second link 33. The angle between the third link 34 and the fourth link 35 is b, and since the first end of the third link 34 is hinged to the first end of the fourth link 35 during the switching process from the TV posture to the lying posture, the angle b between the third link 34 and the fourth link 35 will change with the switching of the posture, and the angle change range of the angle b is between 0°<b≤180°. In the current embodiment, in the sitting position, the angle b between the third link 34 and the fourth link 35 is an acute angle; when the sitting position is converted to the TV position, the seat frame 2 moves, and the angle between the third link 34 and the fourth link 35 gradually increases, but the angle between the longitudinal rod portion 312 and the seat frame 2 does not change at this time; with the process of converting from the TV position to the lying position, the seat frame 2 continues to extend forward to drive the third link 34, and the angle between the third link 34 and the fourth link 35 continues to increase to an obtuse angle, and the fourth link 35 pulls the second link 33 to increase the angle between the longitudinal rod portion 312 and the seat frame 2.

[0047] like Figures 6 to 9 As shown, when in the lying state, when the backrest assembly 3 reaches the maximum angle, in order to further ensure the stability of the limit, a third limit portion 38 is also provided on the second connecting rod 33. The third limit portion 38 protrudes from the second connecting rod 33. When the cross bar portion 311 abuts against the second limit portion 37, the third limit portion 38 on the second connecting rod 33 abuts against the fourth connecting rod 35, thereby limiting the rotation of the second connecting rod 33, further ensuring the stability of the limit, and ensuring that the longitudinal rod portion 312 will not rotate excessively backward.

[0048] In some embodiments, a first limiting portion 36 is provided on the fourth link 35, and the first limiting portion 36 protrudes vertically to the side of the fourth link 35, and the hinge point between the third link 34 and the fourth link 35 is located below the first limiting portion 36; when the seat frame 2 drives the third link 34 to move, so that the third link 34 and the fourth link 35 are in a horizontal state, the first limiting portion 36 on the fourth link 35 abuts against the third link 34, and the setting of the first limiting portion 36 can prevent the first end of the fourth link 35 from rotating downward, and can prevent the angle b between the fourth link 35 and the third link 34 from being greater than 180°. On the one hand, the above setting can make the third link 34 and the fourth link 35 form a right angle, and the movement of the seat frame 2 will inevitably cause the fourth link 35 to pull the second link 33, so that the movement process of the two is clear; on the other hand, after the third limiting portion 38 abuts against the fourth link 35, it can also prevent the third limiting portion 38 from abutting against the fourth link 35 to expand the angle b, so as to form a certain support and ensure stability. Exemplarily, the first limiting portion 36 and the fourth link 35 are strip-shaped plate structures, the hinge points of the third link 34 and the fourth link 35 and the hinge points of the fourth link 35 and the second link 33 are located at both ends of the length direction of the fourth link 35, the first limiting portion 36 is arranged on the long side of the fourth link 35, and the first limiting portion 36 protrudes and extends perpendicularly to the long side direction of the fourth link 35, so that the part of the first limiting portion 36 protruding from the fourth link 35 and the third link 34 are located on the same side of the fourth link 35. The first limiting portion 36 is integrally formed with the fourth link 35.

[0049] like Figure 6 As shown, in some embodiments, the seat frame 2 is provided with a fourth limiting portion 4, the fourth limiting portion 4 protrudes from the seat frame 2, and the fourth limiting portion 4 and the first connecting rod 32 are located on the same side of the seat frame 2, and are located in front of the hinge point between the first connecting rod 32 and the seat frame 2; when in a lying state, the first connecting rod 32 abuts against the fourth limiting portion 4, thereby limiting the second end of the first connecting rod 32 from continuing to rotate forward, further ensuring the angle of the longitudinal rod portion 312, and further improving stability. Exemplarily, the fourth limiting portion 4 is a limiting protrusion or a limiting rivet. In addition, the seat frame 2 is also provided with a sixth limiting portion, which is protruding from the seat frame 2. The sixth limiting portion and the fourth limiting portion 4 are located on the same side of the seat frame 2 and are located in front of the hinge point between the first link 32 and the seat frame 2. At the same time, the sixth limiting portion is located below the fourth limiting portion 4, so that the hinge point between the first link 32 and the seat frame 2 is located between the sixth limiting portion and the fourth limiting portion 4; and the first end of the first link 32 has an extended edge protruding away from the second end of the first link 32. When in the sitting posture and the TV posture, the extended edge abuts against the sixth limiting portion, thereby limiting the first end of the first link 32 from rotating forward, further improving stability. Exemplarily, the sixth limiting portion is a limiting protrusion or a limiting rivet.

[0050] like Figures 2 to 5 As shown, in some embodiments, the first end of the second connecting rod 33 is provided with a protrusion 331, and the protrusion 331 extends in a direction away from the second end of the second connecting rod 33, that is, the hinge point between the second connecting rod 33 and the chassis frame 1 is located between the first end of the second connecting rod 33 and the protrusion 331. Exemplarily, the protrusion 331 and the second connecting rod 33 are integrally formed. The seat frame 2 is also provided with a first connecting member 5, which is located at the front side of the protrusion 331, and an elastic member 7 is connected between the first connecting member 5 and the protrusion 331. When the seat frame 2 extends forward and changes from the TV posture to the lying posture, the first end of the second connecting rod 33 rotates forward around the hinge point between the second connecting rod 33 and the seat frame 2, and at this time, the protrusion 331 rotates backward around the hinge point between the second connecting rod 33 and the seat frame 2, and the elastic member 7 is stretched in the process, so that the elastic member 7 stores energy; when the seat frame 2 retracts and resets backward, due to the elastic potential energy of the elastic member 7, the elastic member 7 will pull the protrusion 331 to reset, and at the same time, it will drive the first end of the second connecting rod 33 to reset, and then drive the first connecting rod 32, the backrest rod 31, the third connecting rod 34 and the fourth connecting rod 35 to reset, and release the dead point between the third connecting rod 34 and the fourth connecting rod 35, so that the reset movement stroke is clear. And due to the presence of the elastic member 7, the driving force of the driving component for driving the seat frame 2 to extend and contract can be reduced during the resetting process. Further, in order to facilitate the installation of the elastic member 7 on the protrusion 331, the second connecting member 6 is provided on the protrusion 331. In order to avoid the interference between the protrusion 331 or the second connecting member 6 and the chassis frame 1 when the second connecting rod 33 rotates, the protrusion 331 and the second connecting rod 33 are not in the same plane, and the protrusion 331 protrudes from the second connecting rod 33 in the direction away from the chassis frame 1, that is, the two are in a stepped shape. Exemplarily, the elastic member 7 can be, but is not limited to, a tension spring. When a tension spring is used, the first connecting member 5 and the second connecting member 6 can be connected by rivets.

[0051] like Figure 2 and Figure 6 As shown, in some embodiments, a fifth limiting portion 8 is further provided on the base frame 1, and the fifth limiting portion 8 is located between the first connecting member 5 and the protrusion 331. When in a sitting position, the protrusion 331 abuts against the fifth limiting portion 8. When switching from a sitting position to a lying position, the protrusion 331 rotates backward around the hinge point between the second connecting rod 33 and the seat frame 2, and the protrusion 331 moves away from the fifth limiting portion 8. When switching from a lying position to a sitting position, the fifth limiting portion 8 can abut against the protrusion 331 to limit the protrusion 331 from rotating forward, and the overall transformation state ends accordingly.

[0052] The utility model also provides a seat, which includes a footrest extension assembly 9 and the above-mentioned large-angle extension function iron frame, the footrest extension assembly 9 is connected to the front end of the seat frame 2 through a four-link assembly, and the seat is also provided with a driving component for driving the footrest extension assembly 9 to extend and retract. The above-mentioned footrest extension assembly 9 and the four-link assembly are both existing technologies and are not described in detail. The above-mentioned large-angle extension function iron frame can increase the adjustment angle of the backrest assembly 3 and improve the experience performance in the lying state.

[0053] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Large-angle extension function iron frame, characterized by: include: Base frame (1); A seat frame (2), wherein the seat frame (2) is capable of extending forward or retracting backward relative to the base frame (1); A backrest assembly (3), the backrest assembly (3) comprising: Backrest rod (31); a first connecting rod (32) and a second connecting rod (33), wherein the first connecting rod (32) is located in front of the second connecting rod (33), a first end of the first connecting rod (32) and a first end of the second connecting rod (33) are hinged to the bottom frame (1) at an interval, and a second end of the first connecting rod (32) and a second end of the second connecting rod (33) are hinged to the backrest rod (31) at an interval; A linkage part, one end of which is hinged to the seat frame (2), and the other end of which is hinged between two ends of the second connecting rod (33).

2. The large-angle extension functional iron frame according to claim 1 is characterized in that: The first connecting rod (32) is provided with a second limiting portion (37) so as to limit the rotation angle of the backrest rod (31).

3. The large-angle extension functional iron frame according to claim 1 is characterized in that: The linkage part comprises a third link (34) and a fourth link (35), the first end of the third link (34) is hinged to the first end of the fourth link (35), the second end of the third link (34) is hinged to the seat frame (2), and the second end of the fourth link (35) is hinged between the two ends of the second link (33).

4. The large-angle extension functional iron frame according to claim 3 is characterized in that: The fourth connecting rod (35) is provided with a first limiting portion (36), and the first limiting portion (36) can abut against the third connecting rod (34) to limit the first end of the fourth connecting rod (35) from rotating downward.

5. The large-angle extension functional iron frame according to claim 3 is characterized in that: The second connecting rod (33) is provided with a third limiting portion (38), and the third limiting portion (38) can abut against the fourth connecting rod (35) to limit the second end of the second connecting rod (33) from rotating forward.

6. The large-angle extension functional iron frame according to claim 3 is characterized in that: The included angle between the third connecting rod (34) and the fourth connecting rod (35) is b, and the variation range of b is 0°<b≤180°.

7. The large-angle extension functional iron frame according to claim 1 is characterized in that: The backrest rod (31) comprises a cross bar portion (311) and a longitudinal bar portion (312); one end of the longitudinal bar portion (312) is connected between two ends of the cross bar portion (311); the other end of the longitudinal bar portion (312) extends in a direction away from the cross bar portion (311); and the second end of the first connecting rod (32) and the second end of the second connecting rod (33) are respectively hinged to the two ends of the cross bar portion (311).

8. The large-angle extension functional iron frame according to claim 7 is characterized in that: The included angle between the longitudinal rod portion (312) and the seat frame (2) is a; the variation range of a is 105°≤a≤160°.

9. The large-angle stretching functional iron frame according to any one of claims 1 to 8, characterized in that: The first end of the second connecting rod (33) is provided with a protrusion (331), and the protrusion (331) extends in a direction away from the second end of the second connecting rod (33). The base frame (1) is provided with a first connecting member (5), and the first connecting member (5) is located at the front side of the protrusion (331). An elastic member (7) is connected between the first connecting member (5) and the protrusion (331), and the elastic member (7) can store energy when the seat frame (2) stretches forward.

10. A seat comprising a footrest extension assembly (9), characterized in that: It also includes a large-angle extension functional iron frame as described in any one of claims 1 to 9, and the footrest extension component (9) is connected to the front end of the seat frame (2).

Images