CN-122004608-A - Mechanical stretching device and seat unit

Abstract

The application discloses a mechanical stretching device and a seat unit, wherein the mechanical stretching device can avoid overturning of the mechanical stretching device in a lying position. The mechanical stretching device further comprises a swinging component and a supporting component, the swinging component is movably connected to the base, the supporting component comprises a second supporting rod and a third supporting rod, one end of the third supporting rod is rotatably connected to the swinging component, the other end of the third supporting rod is rotatably connected to the second supporting rod, one end of the second supporting rod is movably connected to the leg component, a roller is arranged at the other end of the second supporting rod, the third supporting rod and the swinging component are relatively static in the process of changing the mechanical stretching device from a sitting position to a TV position, the second supporting rod rotates along a third direction to reduce the height of the roller, and the third supporting rod and the swinging component move relatively in the process of changing the mechanical stretching device from the TV position to a lying position, and the second supporting rod moves forwards along the first direction and rotates along the third direction to enable the roller to be supported on the ground.

Inventors

• LI YUNHAI
• SU YUN
• SHI LUPING
• WANG PING
• CAO JIZHONG
• GAO YANGBO

Assignees

• 顾家家居股份有限公司

Dates

Publication Date

20260512

Application Date

20260109

Priority Date

20251201

Claims (20)

1. 1. The mechanical stretching device comprises a base, a backrest component, a leg component and a driving device, wherein the leg component and the backrest component are both connected to the base in a rotating mode and are arranged on two opposite sides of the base, the driving device is connected to the leg component in a rotating mode, the mechanical stretching device is provided with a sitting position, a TV pose position and a lying pose position, the driving device drives the base to move along a first direction and drive the leg component to stretch along the first direction in the process of changing the mechanical stretching device from the sitting position to the TV pose position, and the driving device drives the base to move along the first direction and drive the backrest component to rotate along a second direction relative to the base in the process of changing the mechanical stretching device from the TV pose position to the lying position, and the mechanical stretching device is characterized in that: The mechanical stretching device further comprises a swinging assembly and a supporting assembly, the swinging assembly is movably connected to the base, the supporting assembly comprises a second supporting rod and a third supporting rod, one end of the third supporting rod is rotatably connected to the swinging assembly, the other end of the third supporting rod is rotatably connected to the second supporting rod, a roller is arranged at the other end of the second supporting rod, the third supporting rod and the swinging assembly are relatively static in the process of changing the mechanical stretching device from a sitting position to a TV position, the second supporting rod rotates in a third direction to reduce the height of the roller, and the third supporting rod and the swinging assembly relatively move in the process of changing the mechanical stretching device from the TV position to a lying position, and the second supporting rod moves forwards in a first direction and rotates in a third direction to enable the roller to be supported on the ground.
2. 2. The mechanical stretcher of claim 1, wherein the support assembly further comprises a first support bar, one end of the first support bar being rotatably connected to the second support bar, the other end of the first support bar being rotatably connected to the leg assembly, the first support bar being configured to drive the second support bar to rotate; The first support bar rotates in a fourth direction relative to the second support bar during the transition of the mechanical extension device from the sitting position to the TV position, and the first support bar rotates in a fourth direction relative to the second support bar during the transition of the mechanical extension device from the TV position to the lying position and raises the height of the base by the leg assembly.
3. 3. The mechanical stretcher according to claim 1 wherein one of the swing assembly and the third support bar is provided with a rail and the other is provided with a guide; the guide is stationary relative to the track during the transition of the mechanical stretcher from the sitting position to the TV position, and moves along the track during the transition of the mechanical stretcher from the TV position to the recumbent position to support the support assembly on the ground.
4. 4. The mechanical stretcher according to claim 3 wherein the rail is formed as a guide groove provided to the swing assembly, the guide is provided to the third support bar, the guide is movably inserted into the guide groove, the guide groove includes a proximal end and a distal end in a first direction; The guide is located at the distal end when the mechanical extension device is in the sitting position and/or the TV position, and the guide is located at the proximal end when the mechanical extension device is in the recumbent position.
5. 5. A mechanical stretching device according to claim 3, wherein the rail is in a clearance fit with the guide when the mechanical stretching device is in the sitting position and/or wherein the rail is in a clearance fit with the guide when the mechanical stretching device is in the TV position and/or wherein the rail is in a clearance fit with the guide when the mechanical stretching device is in the lying position.
6. 6. The mechanical stretcher of claim 4 wherein the inner wall of the proximal end is provided with a first bumper pad and the inner wall of the distal end is provided with a second bumper pad, the guide contacting the second bumper pad when the mechanical stretcher is in the sitting position and the TV position, and the guide contacting the first bumper pad when the mechanical stretcher is in the lying position.
7. 7. The mechanical stretcher of claim 4 wherein the surface of the guide is provided with a third bumper pad that contacts the inner wall of the guide slot.
8. 8. A mechanical stretching device according to claim 3, wherein the guide is in contact with an inner wall surface of the rail.
9. 9. The mechanical stretching device of any one of claims 4-8, wherein the guide member is fixedly coupled to the third support rod and the guide member is detachably coupled to the third support rod.
10. 10. The mechanical stretching device according to claim 9, wherein the third support rod is provided with at least one first fastener, and the guide is fixedly connected to the third support rod by the first fastener.
11. 11. The mechanical stretching device of any one of claims 4-8, wherein the guide is rotatably coupled to the third support rod and the guide is removably coupled to the third support rod.
12. 12. The mechanical stretcher according to claim 11 wherein the third support bar is provided with at least one first fastener by which the guide is rotatably connected to the third support bar so that the guide can rotate about the first fastener.
13. 13. The mechanical stretching device according to any one of claims 3-8, wherein the guide is provided with a cambered surface, the guide is in contact with the inner wall of the track through the cambered surface, and the connecting force of the guide and the swinging assembly or the third supporting rod is larger than the friction force generated by the movement of the guide along the track.
14. 14. The mechanical stretching device of claim 3, wherein the third support bar comprises a first straight line portion, a second straight line portion and a first bent portion, the first straight line portion and the second straight line portion are connected in an angle through the first bent portion, the guide piece is arranged on the first bent portion, the end portion of the first straight line portion is rotatably connected with the second support bar, and the end portion of the second straight line portion is rotatably connected with the swinging assembly; The second straight line part is provided with a first different-surface structure, and the parts of the second straight line part on two sides of the first different-surface structure are positioned on different planes.
15. 15. The mechanical stretching device according to claim 2, wherein the second support rod comprises a third straight line portion, a second bent portion, a fourth straight line portion, a third bent portion and a mounting portion, the third straight line portion is rotatably connected to the first support rod, the mounting portion is used for mounting the roller, the third straight line portion is in angular engagement with the fourth straight line portion through the second bent portion, the third support rod is rotatably connected to the second bent portion, and the fourth straight line portion is in angular engagement with the mounting portion through the third bent portion; The third linear part and the fourth linear part are respectively provided with a second different-surface structure, the parts of the third linear part on two sides of the second different-surface structure are positioned on different planes, and the parts of the fourth linear part on two sides of the second different-surface structure are positioned on different planes.
16. 16. The mechanical stretcher of claim 2, wherein the first support bar includes a fifth straight portion rotatably connected to the second support bar, a fourth curved portion rotatably connected to the leg assembly, and a sixth straight portion angularly engaged with the sixth straight portion by the fourth curved portion; The position of the fifth linear part connected with the fourth bending part is provided with a third abnormal surface structure, and the parts of the first support rod on two sides of the third abnormal surface structure are positioned on different planes.
17. 17. The mechanical stretching device according to claim 3, wherein the swinging assembly comprises a first swinging rod, a second swinging rod, a third swinging rod, a fourth swinging rod, a fifth swinging rod, a sixth swinging rod and a seventh swinging rod, the track is arranged on the first swinging rod, one end of the first swinging rod is rotatably connected to one end of the second swinging rod, the other end of the second swinging rod is rotatably connected to one end of the third swinging rod, the other end of the third swinging rod is rotatably connected to the base, one end of the fourth swinging rod is rotatably connected to the second swinging rod, the other end of the fourth swinging rod is rotatably connected to one end of the fifth swinging rod, the other end of the fifth swinging rod is rotatably connected to the base, one end of the sixth swinging rod is rotatably connected to the fifth swinging rod, the other end of the sixth swinging rod is rotatably connected to the first swinging rod, one end of the seventh swinging rod is rotatably connected to the fourth swinging rod, and the other end of the seventh swinging rod is rotatably connected to the sixth swinging rod; The swinging assembly is relatively static to the base during the process of changing the mechanical stretching device from the sitting position to the TV pose position, and moves along a first direction relative to the base during the process of changing the mechanical stretching device from the TV pose position to the lying position; During the process of changing the mechanical stretching device from the TV pose position to the lying pose position, the height of the sixth swinging rod is larger than that of the second swinging rod, the second swinging rod swings along a fourth direction relative to the third swinging rod, and the sixth swinging rod swings along a fifth direction relative to the fifth swinging rod so as to drive the second supporting rod to rotate to reduce the height through the third supporting rod.
18. 18. The mechanical stretcher according to claim 17 wherein the base is fixedly provided with a first stop and the third swing lever contacts the first stop to limit movement of the swing assembly when the mechanical stretcher is in either the sitting position or the TV position.
19. 19. The mechanical stretcher according to claim 17 wherein the base is fixedly provided with a second stop, and the fifth swing lever contacts the second stop to limit movement of the swing assembly when the mechanical stretcher is in either the sitting position or the TV position.
20. 20. The mechanical stretcher of claim 17 wherein the base is fixedly provided with a third stop and wherein the third swing lever contacts the third stop to limit movement of the swing assembly when the mechanical stretcher is in the reclined position.

Description

Mechanical stretching device and seat unit Technical Field The application relates to the technical field of seats, in particular to a mechanical stretching device and a seat unit. Background In order to meet the requirements of users for comfort and functionality in various composite scenes, some seats on the market can be adjusted in various postures, mainly including an upright sitting posture, a TV posture with legs stretched and a lying posture close to full lying. It is noted that when such a seat is transitioned from a standard sitting posture to a TV posture or a lying posture, the moving parts such as the seat cushion, the backrest, and the leg support often move as a unit to the front side of the seat. Since the moving part integrates the motor, the framework and other components, the moving part has quite large weight, and when the moving part moves forwards as a whole, the gravity center position of the seating system can be caused to move forwards remarkably. If this center of gravity shift is not sufficiently estimated or properly balanced in the structural design, the overall stability of the seat may be reduced under extreme angles or specific loading conditions, with potential safety hazards of forward tipping. Disclosure of Invention The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides a mechanical stretching device which can avoid overturning when the mechanical stretching device is in a lying position. The application also provides a seat unit with the mechanical stretching device. According to a first aspect of the present application, a mechanical stretching device comprises a base, a backrest assembly, a leg assembly and a driving device, wherein the leg assembly and the backrest assembly are both rotatably connected to the base and are arranged on two opposite sides of the base, and the driving device is rotatably connected to the leg assembly; the mechanical stretching device is provided with a sitting position, a TV pose position and a lying position, wherein the driving device drives the base to move along a first direction and drives the leg assembly to stretch along the first direction during the process of changing the mechanical stretching device from the sitting position to the TV pose position; The mechanical stretching device further comprises a swinging assembly and a supporting assembly, the swinging assembly is movably connected to the base, the supporting assembly comprises a second supporting rod and a third supporting rod, one end of the third supporting rod is rotatably connected to the swinging assembly, the other end of the third supporting rod is rotatably connected to the second supporting rod, a roller is arranged at the other end of the second supporting rod, the third supporting rod and the swinging assembly are relatively static in the process of changing the mechanical stretching device from a sitting position to a TV position, the second supporting rod rotates in a third direction to reduce the height of the roller, and the third supporting rod and the swinging assembly relatively move in the process of changing the mechanical stretching device from the TV position to a lying position, and the second supporting rod moves forwards in a first direction and rotates in a third direction to enable the roller to be supported on the ground. The mechanical stretching device has at least the following beneficial effects that the base, the backrest component and the leg component respectively support the buttocks, the back and the legs of a user. The driving device can drive the three devices to move in a coordinated manner, so that the device can be switched among a sitting posture position, a TV posture position and a lying posture position to adapt to the sitting posture requirements under different use scenes. The angle between the base and the backrest component is smaller when the mechanical stretching device is positioned at the sitting position, the leg component is in a contracted state, the angle between the base and the backrest component is basically maintained when the mechanical stretching device is positioned at the TV position, the leg component stretches outwards, and the angle between the base and the backrest component is further increased when the mechanical stretching device is positioned at the lying position, and the leg component is kept stretched. In the process of converting the mechanical stretching device from the TV pose position to the lying pose position, the base continuously moves forward along the first direction, the third support rod and the swinging assembly generate relative movement, and simultaneously the second support rod moves forward along the first direction and rotates along the third direction, so that the roller contacts the ground, the stability of the device in the pose conversion is enhanced, and the overturning risk possibly cause