Mechanical stretching device for electric seat

Abstract

The utility model relates to an electric seat mechanical stretching device which comprises a seat mounting plate, two mechanical stretching units arranged in a bilateral symmetry mode and a connecting assembly connecting the two mechanical stretching units, each mechanical stretching unit comprises a leg and foot assembly, a control assembly and a backrest assembly, and the control assembly is provided with a backrest control piece. The backrest control part is installed on the seat installation plate, the backrest assembly is composed of a first backrest connecting rod, a second backrest connecting rod, a third backrest connecting rod and a backrest part, the backrest part is hinged to one end of the first backrest connecting rod and one end of the second backrest connecting rod, and the other end of the first backrest connecting rod is hinged to the seat installation plate. The other end of the third backrest connecting rod is hinged to the seat mounting plate, and the other end of the second backrest connecting rod is hinged to the backrest control piece. When a user lies, the backrest assembly moves forwards along with the backrest control piece, and the whole backrest assembly moves forwards relative to the seat mounting plate, so that the backrest assembly is prevented from being in contact with other objects during use.

Description

Technical Field

[0001] This application relates to an electric seat frame, in particular to the design and application of a mechanical stretching device for an electric seat. Background Art

[0002] Referring to the patent document with the publication number CN220832419U and the patent name "Mechanical Stretching Device for Electric Seat", its Embodiment 1 has a defect: when in the lying position, the backrest member is restricted by the seat mounting plate and cannot move forward as a whole relative to the seat mounting plate. When the backrest member tilts backward in the lying position, the user's head extends backward, and when the rear of the seat is relatively close to a wall or other objects, collisions may occur. Summary of the Invention

[0003] The technical problem solved by this application is to overcome the above-mentioned deficiencies in the prior art, and provide a mechanical stretching device for an electric seat in which the backrest assembly moves forward as a whole relative to the seat mounting plate in the lying position, avoiding contact with other objects during use.

[0004] The technical solution adopted by this application to solve the above technical problems is: a mechanical stretching device for an electric seat, including a seat mounting plate, two symmetrically arranged mechanical stretching units on the left and right, and a connecting component connecting the two mechanical stretching units. Each mechanical stretching unit mainly includes a leg and foot component for leg and foot stretching, a control component for controlling the posture adjustment of the leg and foot component and the backrest, and a backrest component. The leg and foot component and the control component are both installed on the seat mounting plate. The control component is provided with a backrest control member, and the backrest control member is installed on the seat mounting plate. The backrest component is composed of a first backrest link, a second backrest link, a third backrest link, and a backrest member. The backrest member is respectively hinged to one end of the first backrest link and one end of the second backrest link. The other end of the first backrest link is installed on the seat mounting plate through the first backrest link hinge shaft of the seat mounting plate. The middle of the second backrest link is hinged to one end of the third backrest link. The other end of the third backrest link is hinged to the seat mounting plate through the third backrest link hinge shaft of the seat mounting plate. The other end of the second backrest link is hinged to the backrest control member. When the electric seat transitions from the TV position to the lying position, on the one hand, the backrest component moves forward following the backrest control member, and on the other hand, the backrest control member rotates clockwise around the backrest control member hinge shaft of the seat mounting plate, driving the second backrest link to move forward. The upper end of the first backrest link extends forward and upward, so that the backrest component moves forward relative to the seat mounting plate and the backrest member tilts backward. The front-back distance between the backrest component and the rear end of the base becomes relatively larger, relatively reducing the possibility of accidents occurring behind the user.

[0005] The control component consists of a front support, a rear support, a first link, a second link, a third link, a fourth link, a fifth link, a sixth link, a transmission rod, and a backrest control member. The seat mounting plate is hinged to one end of the first link, the other end of the first link is hinged to the upper end of the front support, the lower end of the front support is hinged to the front part of the base, the middle of the first link is hinged to the front end of the second link through the first link-second link hinge shaft, and the rear end of the second link is hinged to the backrest control member through the second link-backrest control member hinge shaft; one end of the third link is hinged to the middle of the front support, the other end of the third link is hinged to the upper end of the fifth link, the middle of the fifth link is mounted on the seat mounting plate through the seat mounting plate-fifth link hinge shaft, the front end of the fourth link is hinged to the leg component, and the rear end of the fourth link is hinged to the lower end of the fifth link; the front end of the sixth link is hinged to the leg component, the rear end of the sixth link is hinged to the transmission rod, the transmission rod is fixedly mounted on the seat mounting plate, the backrest control member is mounted on the seat mounting plate through the seat mounting plate-backrest control member hinge shaft, the backrest control member is hinged to the upper end of the rear support through the rear support-backrest control member hinge shaft, the lower end of the rear support is hinged to the rear part of the base, and the backrest control member is hinged to the other end of the second backrest link through the backrest control member-second backrest link hinge shaft.

[0006] When in the lying position, the front-back distance between the backrest assembly and the rear end of the base is increased by 6-8 mm compared with the comparative document.

[0007] The first backrest link has a bent structure facing the second backrest link.

[0008] Compared with the prior art, the present application has the following advantages and effects: When in the lying position, the backrest assembly moves forward following the backrest control member, and the whole backrest assembly moves forward relative to the seat mounting plate, avoiding touching other objects during use. Description of the Drawings

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

[0010] Figure 2 It is an outer side schematic diagram of the sitting position of the embodiment of the present application.

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

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

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

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

[0015] Figure 7This is another structural sitting posture side schematic diagram of the embodiment of the present application.

[0016] Reference numerals:

[0017] 1 - Base; 2 - Seat mounting plate; 21 - First link hinge axis of seat mounting plate; 22 - Fifth link hinge axis of seat mounting plate; 23 - Backrest control member hinge axis of seat mounting plate; 24 - First backrest link hinge axis of seat mounting plate; 25 - Third backrest link hinge axis of seat mounting plate; 3 - Front support member; 4 - Rear support member; 5 - Connection assembly; 51 - Drive rod; 6 - Leg and foot assembly; 7 - First link; 71 - First link and second link hinge axis; 8 - Second link; 9 - Third link; 10 - Fourth link; 11 - Fifth link; 12 - Sixth link; 13 - Transmission rod; 14 - Backrest control member; 141 - Second link and backrest control member hinge axis; 142 - Backrest control member and second backrest link hinge axis; 143 - Rear support member and backrest control member hinge axis; 15 - Backrest assembly; 151 - First backrest link; 152 - Second backrest link; 153 - Third backrest link; 154 - Backrest member; 155 - First backrest link and backrest member hinge axis; 156 - Second backrest link and backrest member hinge axis. Detailed implementation manners

[0018] The present application will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present application, and the present application is not limited to the following embodiments. The front and rear described in the present application are relative to Figure 2 and Figure 2 the left is the front and the right is the rear; unless otherwise specified, the relative changes described in the present application are relative to the comparative document.

[0019] See Figures 1 to 6, in the embodiment of the present application, one end of a driving device (not shown in the figure) is mounted on a base 1, and the other end of the driving device drives a driving rod 51 to move correspondingly, thereby driving the entire mechanical extension device of the electric seat to move correspondingly. It mainly includes two symmetrically arranged mechanical extension units on the left and right, a connecting component 5, and a seat mounting plate 2. In the prior art, the driving device is mounted on the base 1 and hinged to the driving rod 51. The driving rod 51 is rotatably mounted on the seat mounting plate 2 and drives the attitude adjustment of this embodiment. Each mechanical extension unit mainly includes a leg and foot component 6 for the telescopic movement of the legs and feet, a control component for controlling the attitude adjustment of the leg and foot component and the backrest, and a backrest component 15. Compared with the comparative document, the improved design of the present application is mainly in the backrest component 15. The backrest control member 14 of the control component is mounted on the seat mounting plate 2 through a seat mounting plate backrest control member hinge shaft 23. The backrest component of the present application is composed of a first backrest connecting rod 151, a second backrest connecting rod 152, a third backrest connecting rod 153, and a backrest member 154. The backrest member 154 is respectively hinged to one end of the first backrest connecting rod 151 and one end of the second backrest connecting rod 152. The other end of the first backrest connecting rod 151 is mounted on the seat mounting plate 2 through a seat mounting plate first backrest connecting rod hinge shaft 24. The middle of the second backrest connecting rod 152 is hinged to one end of the third backrest connecting rod 153. The other end of the third backrest connecting rod 153 is hinged to the seat mounting plate 2 through a seat mounting plate third backrest connecting rod hinge shaft 25. The other end of the second backrest connecting rod 152 is hinged to the backrest control member 14 through a backrest control member second backrest connecting rod hinge shaft 142. When this embodiment changes from the TV position to the lying position, on the one hand, the backrest control member 14 moves forward and upward following the seat mounting plate 2, driving the entire backrest component 15 to move forward. On the other hand, the backrest control member 14 rotates clockwise around the seat mounting plate backrest control member hinge shaft 23, and the upper part of the backrest control member 14 moves backward around the seat mounting plate backrest control member hinge shaft 23 (see Figures 4 to 6 state change), driving the second backrest connecting rod 152 to move forward, and the upper end of the first backrest connecting rod 151 extends forward and upward, so that the backrest component 15 moves forward relative to the seat mounting plate 2 and the backrest member 154 tilts backward, and the front-back distance L between the backrest component 15 and the rear end of the base 1 becomes relatively larger, relatively reducing the possibility of accidents occurring behind the user.

[0020] As a special case, when in the lying position, the front-back distance L between the backrest component 15 and the rear end of the base 1 is increased by 6 - 8 mm compared with the comparative document.

[0021] The first backrest connecting rod 151 of the present application has a bending structure facing the second backrest connecting rod 152 to prevent collision with the components above the front of the seat mounting plate first backrest connecting rod hinge shaft 24.

[0022] The control component consists of a front support member 3, a rear support member 4, a first link 7, a second link 8, a third link 9, a fourth link 10, a fifth link 11, a sixth link 12, a transmission rod 13, and a backrest control member 14. The seat mounting plate 2 is hinged to one end of the first link 7, and the other end of the first link 7 is hinged to the upper end of the front support member 3. The lower end of the front support member 3 is hinged to the front part of the base 1. The middle part of the first link 7 is hinged to the front end of the second link 8 through a first link-second link hinge shaft 71. The rear end of the second link 8 is hinged to the backrest control member 14 through a second link-backrest control member hinge shaft 141. One end of the third link 9 is hinged to the middle part of the front support member 3, and the other end of the third link 9 is hinged to the upper end of the fifth link 11. The middle part of the fifth link 11 is hinged to the seat mounting plate 2 through a seat mounting plate-fifth link hinge shaft 22. The front end of the fourth link 10 is hinged to the leg and foot component 6, and the rear end of the fourth link 10 is hinged to the lower end of the fifth link 11. The front end of the sixth link 12 is hinged to the leg and foot component 6, and the rear end of the sixth link 12 is hinged to the transmission rod 13. The transmission rod 13 is fixedly installed on the seat mounting plate 2. The backrest control member 14 is installed on the seat mounting plate 2 through a seat mounting plate-backrest control member hinge shaft 23. The upper rear end of the backrest control member 14 is hinged to the upper end of the rear support member 4 through a rear support member-backrest control member hinge shaft 143. The lower end of the rear support member 4 is hinged to the rear part of the base 1. The lower rear end of the backrest control member 14 is hinged to the lower end of the second backrest link 152 through a backrest control member-second backrest link hinge shaft 142.

[0023] When the embodiment of the present application transitions from the TV position to the lying position, the driving device drives the rear part of the seat mounting plate 2 to lift and move forward. The backrest control member 14 moves forward as a whole. The backrest assembly 15 installed between the seat mounting plate 2 and the backrest control member 14 also moves forward as a whole. At the same time, the leg and foot component 6 is restricted by the limit and cannot continue to move forward, so that the second link 8 cannot move forward. The rear end of the second link 8 forces the upper part of the backrest control member 14 to move backward around the seat mounting plate-backrest control member hinge shaft 23 through the second link-backrest control member hinge shaft 141, driving the second backrest link 152 to move forward. The upper end of the first backrest link 151 extends forward and upward, so that the backrest assembly 15 moves forward relative to the seat mounting plate 2 and the backrest member 154 tilts backward, finally forming Figure 5 , Figure 6 the lying position shown.

[0024] See Figure 7 , the seat mounting plate 2 of the present application can also adopt this structure, and the rest are the same except for this.

[0025] Parts not described in the present application are all prior arts or are substantially the same as the comparative documents, and will not be described in detail.

[0026] Any simple deformation or combination of the technical features and technical solutions of the present application should be considered to fall within the protection scope of the present application.

Claims

1. A mechanical extension device for an electric seat, comprising a seat mounting plate, two mechanical extension units arranged symmetrically on the left and right, and a connecting assembly connecting the two mechanical extension units, each mechanical extension unit mainly comprising a leg and foot assembly for leg and foot extension, a control assembly for controlling the leg and foot assembly and the backrest posture adjustment, and a backrest assembly, the leg and foot assembly and the control assembly are both mounted on the seat mounting plate, the control assembly is provided with a backrest control member, and the backrest control member is mounted on the seat mounting plate, wherein: The backrest assembly consists of a first backrest link, a second backrest link, a third backrest link, and a backrest member. The backrest member is hinged to one end of the first backrest link and one end of the second backrest link, respectively. The other end of the first backrest link is mounted on the seat mounting plate through a first backrest link hinge axis of the seat mounting plate. The middle part of the second backrest link is hinged to one end of the third backrest link, the other end of the third backrest link is hinged to the seat mounting plate through the third backrest link hinge axis of the seat mounting plate, and the other end of the second backrest link is hinged to the backrest control member.

2. The electric seat mechanical extension device according to claim 1, characterized in that: The control assembly consists of a front support, a rear support, a first link, a second link, a third link, a fourth link, a fifth link, a sixth link, a transmission rod, and a backrest control member. The seat mounting plate is hinged to one end of the first link, the other end of the first link is hinged to the upper end of the front support, the lower end of the front support is hinged to the front of the base, the middle part of the first link is hinged to the front end of the second link through the first-link-second-link hinge axis, and the rear end of the second link is hinged to the backrest control member through the second-link backrest control member hinge axis; one end of the third link is hinged to the middle of the front support, the other end of the third link is hinged to the upper end of the fifth link, the middle of the fifth link is hinged to the backrest control member, and the rear end of the second link is hinged to the backrest control member through the second-link backrest control member hinge axis. The fifth connecting rod is installed on the seat mounting plate through the seat mounting plate articulation axis, the front end of the fourth connecting rod is articulated with the leg and foot assembly, and the rear end of the fourth connecting rod is articulated with the lower end of the fifth connecting rod; the front end of the sixth connecting rod is articulated with the leg and foot assembly, and the rear end of the sixth connecting rod is articulated with the transmission rod, and the transmission rod is fixedly mounted on the seat mounting plate, the backrest control component is installed on the seat mounting plate through the seat mounting plate backrest control component articulation axis, the backrest control component is articulated with the upper end of the rear support component through the rear support component backrest control component articulation axis, the lower end of the rear support component is articulated at the rear of the base, and the backrest control component is articulated with the other end of the second backrest connecting rod through the backrest control component second backrest connecting rod articulation axis.

3. The electric seat mechanical extension device according to claim 2, characterized in that: When in a lying position, the front-to-back distance between the backrest assembly and the rear end of the base is increased by 6-8 mm.

4. The electric seat mechanical extension device according to claim 1, characterized in that: The first backrest link has a bent structure toward the second backrest link.

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