Forward leaning prevention seat mechanical stretching device

Abstract

The utility model relates to an anti-forward-leaning seat mechanical stretching device which comprises two mechanical stretching units arranged in a bilateral symmetry mode and a connecting assembly connecting the two mechanical stretching units, and each mechanical stretching unit comprises a leg and foot assembly used for stretching and retracting legs and feet and a backrest seat assembly used for adjusting the posture of a backrest and a seat. The backrest seat assembly is mounted on the base through a front supporting piece and a rear supporting piece, and the backrest seat assembly is characterized in that the backrest seat assembly is provided with an auxiliary supporting leg for preventing forward leaning, and the front supporting piece and the auxiliary supporting leg are fixedly connected to form a herringbone support, so that the front side of the front supporting piece is supported in the inclined backward direction when a user lies down, and the forward leaning balance line of the seat moves forwards by 10-15 cm. The stability and reliability of the front support are high in the lying posture, the forward leaning balance line of the seat moves forwards by 10-15 cm, the forward overturning risk of the seat is reduced, the structure is relatively simple, and the cost is low.

Description

Technical Field

[0001] The present application relates to an electric seat frame, and in particular to the design and application of an anti-tilt seat mechanical extension device. Background Art

[0002] In order to simplify the structure and save costs, the mechanical extension device of the electric seat in the prior art usually does not take into account the situation where the user uses the electric seat incorrectly, which creates a risk: the center of gravity of the mechanical extension device of the seat moves forward when the user is in a lying position. If the user attempts to move forward and sit up without changing into a sitting position, the forward shift of the human body pressure can easily cause the entire mechanical extension device of the seat to tilt forward; at the same time, the center of gravity of the mechanical extension device of the seat moves forward when the user is in a lying position, the angle between the front support and the bottom surface of the seat becomes smaller, the side pressure increases, and it is easy to be damaged. Summary of the invention

[0003] The technical problem solved by the present application is to overcome the above-mentioned deficiencies in the prior art and to provide a mechanical extension device for preventing forward tilt of a seat with an additional front auxiliary support when in a lying position.

[0004] The technical solution adopted by the present application to solve the above-mentioned technical problems is: a mechanical extension device for preventing forward tilt of a seat, comprising two mechanical extension units symmetrically arranged on the left and right and a connecting assembly connecting the two mechanical extension units, each mechanical extension unit comprising a leg and foot assembly for leg and foot extension and a backrest and seat assembly for adjusting the posture of the backrest and the seat, the backrest and seat assembly being installed on a base through a front support member and a rear support member, and characterized in that: the backrest and seat assembly are provided with auxiliary support feet for preventing forward tilt, the front support member and the auxiliary support feet are fixedly connected to form a herringbone support, so that the front side of the front support member is supported in the oblique rear direction when the seat is in a lying position, which improves the stability and reliability of the front support on the one hand, and moves the forward tilt balance line of the seat forward by 10 to 15 centimeters on the other hand, thereby reducing the risk of the seat tipping forward.

[0005] The auxiliary support foot is provided with a sole, and when the seat is in a lying position, the bottom surface of the sole and the bottom surface of the base are on the same plane, and the balance line of the seat tilting forward moves forward by 12 cm.

[0006] As a special case, the backrest seat assembly is provided with a seat mounting plate, a front support member, a rear support member, a first link, a second link, a third link, a fourth link, a fifth link, a backrest control member, a protective member, a backrest link, and a backrest member. The protective member is fixedly mounted on the seat mounting plate, the seat mounting plate is hinged to the upper end of the first link, the first link is hinged to the upper end of the front support member through the first link hinge shaft of the front support member, the lower end of the front support member is hinged to the front end of the base, the middle part of the first link is hinged to the second The front end of the connecting rod is hinged, and the rear end of the second connecting rod is hinged to the front upper end of the backrest control component; the third connecting rod is hinged to the middle part of the front support component, the third connecting rod is hinged to the fifth connecting rod, the fifth connecting rod is hinged to the seat mounting plate, the front end of the fourth connecting rod is hinged to the leg and foot assembly, and the rear end of the fourth connecting rod is hinged to the fifth connecting rod; the rear upper end of the backrest control component is hinged to the upper end of the rear support component, the lower end of the rear support component is hinged to the rear end of the base, the front lower end of the backrest control component is hinged to the lower end of the protective component, and the rear lower end of the backrest control component is hinged to the backrest connecting rod.

[0007] The present application installs a return spring between the seat mounting plate and the backrest control member to help the backrest control member and the backrest member return to the initial state when the seat is not in a reclining position.

[0008] Compared with the prior art, the present application has the following advantages and effects: the front support member is fixedly connected to the auxiliary support legs to form a herringbone support, so that the front side of the front support member is supported in an oblique rearward direction when the seat is in a lying position, which on the one hand improves the stability and reliability of the front support, and on the other hand moves the forward tilt balance line of the seat forward by 10 to 15 centimeters, thereby reducing the risk of the seat tipping forward, and the structure is relatively simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a three-dimensional schematic diagram of the sitting posture of an embodiment of the present application.

[0010] Figure 2 It is a schematic top view of the TV posture of an embodiment of the present application.

[0011] Figure 3 It is a three-dimensional schematic diagram of the TV posture of an embodiment of the present application.

[0012] Figure 4 It is a schematic diagram of the outer side of the TV posture of an embodiment of the present application.

[0013] Figure 5 It is a three-dimensional schematic diagram of a lying position according to an embodiment of the present application.

[0014] Figure 6 It is a schematic diagram of the outer side of the lying position of an embodiment of the present application.

[0015] In the figure:

[0016] 1-base; 2-seat mounting plate; 21-seat mounting plate fifth link articulation axis; 3-front support; 31-auxiliary support foot; 32-front support third link articulation axis; 33-front support first link articulation axis; 4-rear support; 41-rear support backrest control member articulation axis; 5-connecting assembly; 51-front drive rod; 52-rear drive rod; 6-drive device; 7-first link; 8-second link; 81-second link backrest control member articulation axis; 9-third link; 91-third link fifth link articulation axis; 10-fourth link; 101- The fifth link of the four-link articulated axis; 102-the fourth link leg-foot assembly articulated axis; 11-the fifth link; 12-backrest control component; 121-backrest control component protective component articulated axis; 122-backrest control component backrest link articulated axis; 15-protective component; 16-backrest link; 161-backrest link backrest component articulated axis; 17-backrest component; 18-leg-foot assembly; 181-leg link one; 182-leg link two; 183-leg link three; 184-leg link four; 185-footrest; L10-reset spring; 0-original forward tilt balance line; L1-current forward tilt balance line. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the present application in conjunction with the accompanying drawings and through examples. The following examples are explanations of the present application and the present application is not limited to the following examples. Figure 6 In terms of Figure 6 The left is the back and the right is the front.

[0018] See also Figure 1 to Figure 6 The embodiment of the present application mainly includes two mechanical extension units and a connecting assembly 5 that are symmetrically arranged on the left and right. Each mechanical extension unit mainly includes a leg and foot assembly 18 for leg and foot extension and a backrest and seat assembly for adjusting the backrest and seat posture. In order to prevent the seat from tilting forward when lying down, the main improved design of the present application is to set an auxiliary support foot 31 on the backrest seat assembly to prevent tilting forward. When the embodiment of the present application is in a lying position, the front support member 3 and the auxiliary support foot 31 form a herringbone support, so that the front side of the front support member 3 obtains support in the oblique rear direction when lying down. On the one hand, the stability and reliability of the front support are improved, and on the other hand, the seat tilt balance line (the overall center of gravity of the user and the seat will not tilt forward as long as it does not cross the seat tilt balance line forward. The original tilt balance line is L0, and the current tilt balance line is moved forward to L1) is moved forward by 10~15 cm, thereby reducing the risk of tipping forward of the embodiment of the present application.

[0019] As a special case, the auxiliary support foot 31 of the embodiment of the present application is provided with a sole 311. When lying down, the bottom surface of the sole 311 is on the same plane as the bottom surface of the base 1, and the forward leaning balance line is moved forward (L1-L0) by 12 cm, which can ensure that an adult of normal weight (within 75 kg) will not lean forward when sitting on the seat board.

[0020] The backrest seat assembly is provided with a seat mounting plate 2, a front support member 3, a rear support member 4, a first connecting rod 7, a second connecting rod 8, a third connecting rod 9, a fourth connecting rod 10, a fifth connecting rod 11, a backrest control member 12, a protective member 15, a backrest connecting rod 16, and a backrest member 17. The protective member 15 is fixedly mounted on the seat mounting plate 2, the seat mounting plate 2 is hinged to the upper end of the first connecting rod 7, and the first connecting rod 7 is connected to the front support member 3 through the first connecting rod hinge shaft 33 of the front support member. The upper end is hinged to support the front part of the seat mounting plate 2, the lower end of the front support member 3 is hinged to the front end of the base 1, the middle part of the first link 7 is hinged to the front end of the second link 8, and the rear end of the second link 8 is hinged to the front upper end of the backrest control member 12 through the second link backrest control member hinge shaft 81; one end of the third link 9 is hinged to the middle part of the front support member 3 through the third link hinge shaft 32 of the front support member, and the other end of the third link 9 is hinged to the fifth link 11 through the third link fifth link hinge shaft 91 The fifth link 11 is hinged to the seat mounting plate 2 through the fifth link hinge shaft 21 of the seat mounting plate, the fifth link 11 is hinged to the rear end of the fourth link 10 through the fourth link fifth link hinge shaft 101, and the front end of the fourth link 10 is hinged to the leg link 2 182 of the leg and foot assembly 18 through the fourth link leg and foot assembly hinge shaft 102; the upper rear end of the backrest control member 12 is hinged to the upper end of the rear support member 4 through the rear support member backrest control member hinge shaft 41. Hinge: the lower end of the rear support member 4 is hinged at the rear end of the base 1; the front lower end of the backrest control member 12 is hinged to the lower end of the protective member 15 through the backrest control member protective member hinge shaft 121; the rear lower end of the backrest control member 12 is hinged to the backrest connecting rod 16 through the backrest control member backrest connecting rod hinge shaft 122; when the backrest control member backrest connecting rod hinge shaft 122 moves forward relatively, the backrest connecting rod backrest member hinge shaft 161 is driven to rotate downward, thereby causing the backrest member 17 to tilt backward relatively.

[0021] In the present application, a return spring 19 is installed between the seat mounting plate 2 and the backrest control member 12 to help the backrest control member 12 and the backrest member 17 return to the initial state (not tilted back) when the backrest is in a non-lying position (sitting position, TV position).

[0022] The parts not described in this application are all prior art. The process of the anti-tilt forward seat mechanical extension device changing from a sitting position to a lying position and its reset process are also the same as the prior art and will not be described in detail.

[0023] Any simple deformation or combination of the technical features and technical solutions of this application should be considered to fall within the protection scope of this application.

Claims

1. A mechanical extension device for preventing forward tilting of a seat, comprising two mechanical extension units arranged symmetrically on both sides and a connecting assembly connecting the two mechanical extension units, each mechanical extension unit comprising a leg and foot assembly for leg extension and a backrest and seat assembly for adjusting the backrest and seat posture, the backrest and seat assembly being mounted on a base through a front support member and a rear support member, wherein: The backrest seat assembly is provided with auxiliary support feet for preventing forward tilting, the front support member is fixedly connected with the auxiliary support feet to form a herringbone support, and the forward tilt balance line of the seat is moved forward by 10 to 15 centimeters.

2. The anti-tilt seat mechanical extension device according to claim 1 is characterized in that: The auxiliary support foot is provided with a sole, and when the seat is in a lying position, the bottom surface of the sole and the bottom surface of the base are on the same plane, and the balance line of the seat tilting forward moves forward by 12 cm.

3. The anti-tilt seat mechanical extension device according to claim 1 is characterized in that: The backrest seat assembly is provided with a seat mounting plate, a front support member, a rear support member, a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a fifth connecting rod, a backrest control member, a protective member, a backrest connecting rod, and a backrest member. The protective member is fixedly mounted on the seat mounting plate, the seat mounting plate is hinged to the upper end of the first connecting rod, the first connecting rod is hinged to the upper end of the front support member through the first connecting rod hinge shaft of the front support member, the lower end of the front support member is hinged to the front end of the base, the middle part of the first connecting rod is hinged to the front end of the second connecting rod, and the middle part of the first connecting rod is hinged to the front end of the second connecting rod. The first end is hinged with the second connecting rod, the rear end of the second connecting rod is hinged with the front upper end of the backrest control member; the third connecting rod is hinged with the middle part of the front support member, the third connecting rod is hinged with the fifth connecting rod, the fifth connecting rod is hinged with the seat mounting plate, the front end of the fourth connecting rod is hinged with the leg and foot assembly, and the rear end of the fourth connecting rod is hinged with the fifth connecting rod; the rear upper end of the backrest control member is hinged with the upper end of the rear support member, the lower end of the rear support member is hinged at the rear end of the base, the front lower end of the backrest control member is hinged with the lower end of the protective member, and the rear lower end of the backrest control member is hinged with the backrest connecting rod.

4. The anti-tilt seat mechanical extension device according to claim 3 is characterized in that: A return spring is installed between the seat mounting plate and the backrest control component.

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