Automobile seat footrest pushing and locking mechanism

Abstract

The utility model discloses a kind of automobile seat foot support push and locking mechanism, including driving mechanism, mounting bracket, locking mechanism and foot support assembly, mounting bracket includes two longitudinal supports and the transverse support slidingly connected between the front end of two longitudinal supports, driving mechanism includes extension motor, fixed support and extension hinge mechanism, fixed support is connected between two longitudinal supports, extension motor is screw rod motor fixed on transverse support, its screw rod is equipped with extension support, extension support is rotatably connected with the front end of extension hinge mechanism, extension hinge mechanism is limited and rotatably connected on fixed support, its rear end is rotatably connected with foot support assembly, when extension motor works, extension support can be driven to move forwards and backwards, to drive extension hinge mechanism telescopic, to further drive foot support assembly forwards and backwards sliding, when foot support assembly moves to design position backwards, locking mechanism can realize the backward sliding locking of foot support assembly. The utility model can realize foot support stable and long distance sliding.

Description

Technical Field

[0001] This utility model relates to the field of automotive seat technology, and in particular to an automotive seat footrest extension and locking mechanism. Background Technology

[0002] In automotive seat design, footrest mechanisms are increasingly used to enhance passenger comfort. Footrest mechanisms provide foot support when needed, effectively alleviating fatigue from long journeys. However, existing automotive seat footrest extension and locking mechanisms have many unresolved issues in design and practical application, limiting their full performance and wider application. Traditional footrest mechanisms mostly use a single screw and nut mechanism to extend the footrest. While this structure can achieve some forward and backward movement of the footrest, it has significant limitations. When the screw is short, the sliding distance of the footrest is greatly limited, failing to meet the passenger's need for footrest position adjustment. Using a longer screw to increase the sliding distance introduces new problems. Longer screws, due to their length, have relatively poor rigidity during operation, making them prone to bending and wobbling under external forces or during operation, resulting in poor stability of the footrest during sliding. This unstable sliding not only affects the passenger's experience but may also cause the footrest to collide with the seat or other components, producing abnormal noises or even damaging parts. More importantly, the aforementioned contradictions in the sliding distance and stability of traditional car seat footrest extension and locking mechanisms make them unsuitable for the compact design trends of modern car seats. There is typically a limited gap between the bottom of the car seat and the vehicle floor, and traditional footrest mechanisms, limited by their structural characteristics (limited sliding distance, making it difficult to fully extend from the bottom of the front seat backward), cannot be effectively placed within this confined space. This results in the footrest mechanism usually needing to be positioned outside the seat bottom in practical applications, occupying additional interior space, hindering the rational use of interior space, and affecting the overall aesthetics and harmony of the seat. Utility Model Content

[0003] In view of the problems existing in the prior art, the present invention aims to provide a car seat footrest extension and locking mechanism that can achieve stable footrest sliding over long distances within a limited space.

[0004] To achieve the above objectives, this utility model proposes a car seat footrest extension and locking mechanism, including a drive mechanism, a mounting bracket, a locking mechanism, and a footrest assembly. The mounting bracket includes two longitudinal brackets and a transverse bracket connected between the front ends of the two longitudinal brackets. Each of the inner sidewalls of the two longitudinal brackets is provided with an outer drawer rail extending forward and backward. Both ends of the footrest assembly are respectively connected to the two outer drawer rails via inner drawer rails, thereby slidingly connecting it forward and backward between the two longitudinal brackets. The drive mechanism includes an extension motor, a fixed bracket, and an extension hinge mechanism. The fixed bracket is connected between the two longitudinal brackets and located in the transverse direction. On the rear side of the bracket, the extension motor is a lead screw motor, which is fixed on the horizontal bracket, and its lead screw extends backward. The lead screw is threaded with an extension bracket, which is rotatably connected to the front end of the extension hinge mechanism. The extension hinge mechanism is confined to the fixed bracket and can rotate along the fixed bracket. Its rear end is rotatably connected to the footrest assembly. When the extension motor works, it can drive the extension bracket to move back and forth, thereby driving the extension hinge mechanism to perform back and forth extension and retraction, and then driving the footrest assembly to slide back and forth. When the footrest assembly moves backward to the designed position, the locking mechanism can realize the backward sliding lock of the footrest assembly.

[0005] In the above scheme: the extending hinge mechanism includes two first links that are cross-hinged in the middle, two second links that are cross-hinged in the middle, and two third links that are cross-hinged at the rear. The front ends of the two first links are slidably limited to the fixed bracket and can rotate horizontally along the fixed bracket. The front ends of the two second links are hinged to the rear ends of the two first links, and the front ends of the two third links are hinged to the rear ends of the two second links. The extending bracket is horizontally rotatably connected to the cross-hinged joint of the two first links, and the footrest assembly is horizontally rotatably connected to the cross-hinged joint of the two third links.

[0006] The extension hinge mechanism, composed of two first links, two second links, and two third links connected by hinges, coordinates and moves in tandem with each other when the extension motor drives the extension bracket to move back and forth. This multi-link structure amplifies the small displacement of the extension bracket and translates it into a larger back-and-forth movement distance of the footrest assembly. This allows the footrest assembly to slide a long distance within a limited space, meeting the diverse needs of passengers for the extension length of the footrest.

[0007] In the above scheme: the fixed bracket is provided with two left-right extending sliding grooves. The front ends of the two first connecting rods are slidably connected to the two sliding grooves one by one by stepped bolts or rivets, so that the left-right sliding of the front ends of the two first connecting rods is limited to the fixed bracket, and can rotate horizontally along the fixed bracket. During the movement of the extension hinge mechanism, the front ends of the first connecting rods can only slide left and right within the range specified by the sliding grooves, effectively avoiding excessive left-right deviation of the first connecting rods during movement, ensuring that the entire extension hinge mechanism maintains a stable movement trajectory in the horizontal direction, thereby ensuring that the footrest assembly can move back and forth along the predetermined path, and improving the accuracy and reliability of the footrest extension mechanism.

[0008] In the above scheme: the locking mechanism includes a locking shaft, a locking bracket, two sliding locking sheet metals arranged side by side, and strip-shaped extension sections extending forward from both ends of the foot support assembly. The two sliding locking sheet metals are respectively located inside the corresponding strip-shaped extension sections. The front ends of the two sliding locking sheet metals are respectively fixed to both ends of the fixed bracket. The middle parts of the two sliding locking sheet metals are respectively fixed to the longitudinal brackets on the corresponding sides by fixed lugs. The two sliding locking sheet metals are provided with second guide grooves extending forward and backward in opposite directions. The two strip-shaped extension sections are provided with first guide grooves extending forward and backward in opposite directions. The locking bracket is located on both sides... The second link is horizontally rotatably connected to its cross hinge joint. The locking shaft is transversely inserted into the locking bracket, each of the first guide grooves and each of the second guide grooves. When the extended hinge mechanism drives the footrest assembly to move back and forth, it can simultaneously drive the locking bracket to move back and forth, thereby driving the locking shaft to move back and forth. When the footrest assembly is in the storage position, the locking shaft is located at the rear end of the first guide groove and at the front end of the second guide groove. When the footrest assembly moves backward, the locking shaft can move forward relative to the first guide groove and backward relative to the second guide groove until it slides to the rear end of the second guide groove, so as to realize the backward sliding lock of the footrest assembly.

[0009] By sliding the locking shaft relative to the first and second guide grooves, the footrest assembly can achieve rearward sliding locking when the locking shaft slides to the rear end of the second guide groove. This locking method is based on the travel limit of the locking shaft by the guide groove, which can accurately determine the locking position of the footrest assembly and ensure that the footrest can be stably fixed after it extends to the designed position. In addition, the extension hinge mechanism is connected to the locking shaft through the locking bracket in the middle, and there is also a hook mounting point in the middle, which can further ensure the stability of the movement of the extension hinge mechanism.

[0010] In the above scheme: when the locking shaft slides to the rear end of the second guide groove, it also slides to the front end of the first guide groove. The movement of the locking shaft in the first and second guide grooves is interrelated. When the locking shaft slides to the rear end of the second guide groove, it reaches the front end of the first guide groove, indicating that the movements of the extension hinge mechanism, the footrest assembly, and the locking mechanism are highly coordinated. This can, to a certain extent, achieve interlocking between the footrest assembly and the sliding locking sheet metal, enhancing the impact resistance of the locking mechanism.

[0011] In the above design: the inner drawer rail and the strip extension section are integrally formed, with the inner drawer rail located on the outer side of the corresponding side strip extension section. This integral design makes the entire structure more robust, capable of withstanding greater forces and vibrations, and improves the reliability and durability of the footrest mechanism. The longitudinal support can also be integrally formed with the outer drawer rail. The fixed support, fixed lugs, and extending hinge mechanism are designed in a staggered manner to avoid interference with the movement of the extending hinge mechanism.

[0012] The beneficial effects of this utility model are:

[0013] 1. By cleverly integrating the lead screw and hinge structure, the sliding distance of the footrest is effectively extended. Compared to a design using a long lead screw alone, this composite structure significantly improves the stability of the footrest during sliding, effectively avoiding the problem of insufficient sliding stability caused by the long lead screw acting alone. In addition, the structure is simple in design, requiring no complex processes or a large number of parts, thus significantly reducing production costs while ensuring performance. 2. The hinge structure is confined to the fixed bracket and can rotate along it. Simultaneously, the footrest assembly is slidably connected between the two longitudinal brackets through the cooperation of the inner and outer drawer rails. This multi-component collaborative working method allows the footrest assembly to maintain a smooth movement during extension and retraction, reducing wobbling and jamming, and providing passengers with a more comfortable and stable user experience. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the present invention in its stored state.

[0015] Figure 2 This is a schematic diagram of the utility model in the open state.

[0016] Figure 3 This is a schematic diagram of the drive mechanism.

[0017] Figure 4 This is a schematic diagram of the footrest assembly. Detailed Implementation

[0018] like Figure 1 As shown in Figure 4, a car seat footrest extension and locking mechanism mainly consists of a drive mechanism A, a mounting bracket 1, a locking structure, and a footrest assembly B.

[0019] Mounting bracket 1 includes two longitudinal brackets 101 and a transverse bracket 102 connected between the front ends of the two longitudinal brackets 101. The inner sidewalls of the two longitudinal brackets 101 are provided with front-to-back extending outer drawer rails 2. The two ends of the foot support assembly B are respectively connected to the two outer drawer rails 2 through inner drawer rails 3, so as to slide back and forth between the two longitudinal brackets 101.

[0020] The drive mechanism A includes an extension motor 4, a fixed bracket 6, and an extension hinge mechanism 7. The fixed bracket 6 is connected between two longitudinal brackets 101 and is located on the rear side of the transverse bracket 102. The extension motor 4 is a lead screw motor, which is fixed on the transverse bracket 102 and its lead screw extends backward. The lead screw is threaded with an extension bracket 5. The extension bracket 5 is rotatably connected to the front end of the extension hinge mechanism 7. The extension hinge mechanism 7 is limited to the fixed bracket 6 and can rotate along the fixed bracket 6. Its rear end is rotatably connected to the foot support assembly B.

[0021] When the extension motor 4 is working, it can drive the extension bracket 5 to move back and forth, thereby driving the extension hinge mechanism 7 to move back and forth, and then driving the footrest assembly B to slide back and forth. When the footrest assembly B moves backward to the designed position, the locking mechanism can realize the backward sliding lock of the footrest assembly B.

[0022] Preferably, the extending hinge mechanism 7 includes two first links 701 that are cross-hinged at the middle, two second links 702 that are cross-hinged at the middle, and two third links 703 that are cross-hinged at the rear. The front ends of the two first links 701 are slidably limited to the fixed bracket 6 and can rotate horizontally along the fixed bracket 6. The front ends of the two second links 702 are hinged to the rear ends of the two first links 701, and the front ends of the two third links 703 are hinged to the rear ends of the two second links 702. The extending bracket 5 is horizontally rotatably connected to the cross-hinged joint of the two first links 701, and the footrest assembly B is horizontally rotatably connected to the cross-hinged joint of the two third links 703.

[0023] The extension hinge mechanism 7, composed of two first links 701, two second links 702, and two third links 703 connected by hinges, coordinates and moves in tandem with each other when the extension motor 4 drives the extension bracket 5 to move back and forth. This multi-link structure amplifies the small displacement of the extension bracket 4 and converts it into a larger back and forth movement distance of the footrest assembly B, thereby enabling the footrest assembly to slide a long distance within a limited space and meeting the diverse needs of passengers for the extension length of the footrest.

[0024] Ideally, the fixed bracket 6 has two left-right extending grooves 601 arranged opposite each other. The front ends of the two first connecting rods 701 are slidably connected to the two grooves 601 one by one by stepped bolts or rivets, so that the left-right sliding of the front ends of the two first connecting rods 701 is limited on the fixed bracket 6, and can rotate horizontally along the fixed bracket 6. During the movement of the extension hinge mechanism 7, the front ends of the first connecting rods 701 can only slide left and right within the range specified by the grooves 601, effectively avoiding excessive left-right deviation of the first connecting rods 701 during the movement, ensuring that the entire extension hinge mechanism 7 maintains a stable movement trajectory in the horizontal direction, thereby ensuring that the footrest assembly B can move back and forth along the predetermined path, improving the accuracy and reliability of the footrest extension mechanism.

[0025] Preferably, the locking mechanism includes a locking shaft 8, a locking bracket 9, two sliding locking sheet metals 10 arranged side by side, and strip-shaped extension sections 11 formed by the two ends of the foot support assembly B extending forward. The two sliding locking sheet metals 10 are located inside the corresponding strip-shaped extension sections 11. The front ends of the two sliding locking sheet metals 10 are fixed to the two ends of the fixed bracket 6. The middle parts of the two sliding locking sheet metals 10 are fixed to the corresponding longitudinal brackets 101 by fixed lugs 12. The two sliding locking sheet metals 10 are provided with second guide grooves 13 extending forward and backward in opposite directions. The two strip-shaped extension sections 11 are provided with first guide grooves 14 extending forward and backward in opposite directions. The locking bracket 9 is located at the intersection of the two second connecting rods 702. The hinge is horizontally rotatably connected to it. The locking shaft 8 is transversely inserted into the locking bracket 9, each of the first guide grooves 14 and each of the second guide grooves 13. When the extended hinge mechanism 7 drives the footrest assembly B to move back and forth, it can also drive the locking bracket 9 to move back and forth, thereby driving the locking shaft 8 to move back and forth. When the footrest assembly B is in the storage position, the locking shaft 8 is located at the rear end of the first guide groove 14 and at the front end of the second guide groove 13. When the footrest assembly B moves backward, the locking shaft 8 can move forward relative to the first guide groove 14 and backward relative to the second guide groove 13 until it slides to the rear end of the second guide groove 13 (that is, when the footrest assembly B reaches the design position), so as to realize the backward sliding lock of the footrest assembly B.

[0026] By sliding the locking shaft 8 relative to the first guide groove 14 and the second guide groove 13, when the locking shaft 8 slides to the rear end of the second guide groove 13, the footrest assembly B can achieve rearward sliding locking. This locking method is based on the travel limitation of the guide groove on the locking shaft 8, which can accurately determine the locking position of the footrest assembly B and ensure that the footrest can be stably fixed after it is extended to the appropriate position. Furthermore, the extension hinge mechanism 7 is connected to the locking shaft 8 in its middle through the locking bracket 9, and there is also a hook mounting point in its middle, which can further ensure the stability of the movement of the extension hinge mechanism 7.

[0027] Ideally, when the locking shaft 8 slides to the rearmost end of the second guide groove 13, it should also slide to the frontmost end of the first guide groove 14. The movements of the locking shaft 8 in the first guide groove 14 and the second guide groove 13 are interconnected. When the locking shaft 8 slides to the rearmost end of the second guide groove 13, it should also reach the frontmost end of the first guide groove 14. This indicates that the movements of the extending hinge mechanism, the footrest assembly B, and the locking mechanism are highly coordinated. To a certain extent, this achieves interlocking between the footrest assembly and the sliding locking sheet metal, enhancing the impact resistance of the locking mechanism.

[0028] Ideally, the inner drawer slide 3 and the strip extension 11 are integrally formed, with the inner drawer slide 3 located on the outer side of the corresponding side strip extension 11. This integral design makes the entire structure more robust, able to withstand greater forces and vibrations, and improves the reliability and durability of the foot support mechanism. The longitudinal support 101 can also be integrally formed with the outer drawer slide 2. The fixed support 6, fixed lug 12, and the extending hinge mechanism 7 are designed in a staggered manner to avoid interference with the movement of the extending hinge mechanism 7.

[0029] Specifically, the locking bracket 9 is provided with a through groove for the locking shaft 8 to pass through laterally. The through groove can be an oblique guide groove that is higher at the front and lower at the back. The front end of the first guide groove 14 and the rear end of the second guide groove 13 can both be provided with upwardly extending locking sections. The foot support assembly B can include a bridge bracket and a supporting sheet metal. The inner drawer rail 3 and the strip extension section 11 are both arranged on the bridge bracket. The supporting sheet metal is installed on the bridge bracket through a flip assembly and is in a flat state. The rear end of the extended hinge mechanism 7 is hinged to the supporting sheet metal through a rotating swing arm. When the bridge bracket is driven to move backward, the locking shaft 8 can move forward relative to the first guide groove 14. Simultaneously, relative to the second guide groove 13, the locking shaft 8 slides to the rearmost end of the second guide groove 13, and then slides to the frontmost end of the first guide groove 14, thereby achieving the rearward sliding lock of the bridge support. At this time, the extending motor 4 drives the extending hinge mechanism 7 to continue to extend backward, which can drive the locking shaft 8 to slide obliquely upward from the lowest end of the oblique guide groove, thereby sliding into the locking section of the first guide groove 14 and the second guide groove 13. At the same time, it can drive the rotating swing arm to flip upward, thereby driving the supporting sheet metal and the flipping assembly to move together, realizing the folding of the supporting sheet metal, so that it forms a support state with the front high and the back low.

Claims

1. A mechanism for extending and locking a car seat footrest, characterized in that: The device includes a drive mechanism (A), a mounting bracket (1), a foot support assembly (B), and a locking mechanism. The mounting bracket (1) includes two longitudinal brackets (101) and a transverse bracket (102) connected between the front ends of the two longitudinal brackets (101). The inner walls of the two longitudinal brackets (101) are each provided with an outer drawer rail (2) extending forward and backward. The two ends of the foot support assembly (B) are respectively connected to the two outer drawer rails (2) via inner drawer rails (3), thereby sliding forward and backward between the two longitudinal brackets (101). The drive mechanism (A) includes an extension motor (4), a fixed bracket (6), and an extension hinge mechanism (7). The fixed bracket (6) is connected between the two longitudinal brackets (101) and located on the transverse bracket (102). On the rear side, the extension motor (4) is a lead screw motor, which is fixed on the transverse bracket (102) and its lead screw extends backward. The lead screw is threaded with an extension bracket (5). The extension bracket (5) is rotatably connected to the front end of the extension hinge mechanism (7). The extension hinge mechanism (7) is limited to the fixed bracket (6) and can rotate along the fixed bracket (6). Its rear end is rotatably connected to the footrest assembly (B). When the extension motor (4) works, it can drive the extension bracket (5) to move back and forth, thereby driving the extension hinge mechanism (7) to perform back and forth extension and retraction, and then driving the footrest assembly (B) to slide back and forth. When the footrest assembly (B) moves backward to the designed position, the locking mechanism can realize the backward sliding lock of the footrest assembly (B).

2. The automobile seat footrest extension and locking mechanism according to claim 1, characterized in that: The extended hinge mechanism (7) includes two first links (701) that are cross-hinged in the middle, two second links (702) that are cross-hinged in the middle, and two third links (703) that are cross-hinged at the rear end. The front ends of the two first links (701) are limited to sliding left and right on the fixed bracket (6) and can rotate horizontally along the fixed bracket (6). The front ends of the two second links (702) are hinged to the rear ends of the two first links (701) one by one, and the front ends of the two third links (703) are hinged to the rear ends of the two second links (702) one by one. The extended bracket (5) is horizontally rotatably connected to the two first links (701) at the cross-hinged joint. The footrest assembly (B) is horizontally rotatably connected to the two third links (703) at the cross-hinged joint.

3. The automobile seat footrest extension and locking mechanism according to claim 2, characterized in that: The fixed bracket (6) has two left-right extending sliding grooves (601) arranged opposite each other. The front ends of the two first connecting rods (701) are slidably connected to the two sliding grooves (601) by step bolts or rivets, so as to realize that the front ends of the two first connecting rods (701) are limited to sliding left and right on the fixed bracket (6).

4. The automobile seat footrest extension and locking mechanism according to claim 2, characterized in that: The locking mechanism includes a locking shaft (8), a locking bracket (9), two sliding locking sheet metals (10) arranged side by side, and a strip extension section (11) formed by extending forward from both ends of the foot support assembly (B). The two sliding locking sheet metals (10) are located inside the corresponding strip extension section (11). The front ends of the two sliding locking sheet metals (10) are fixed to both ends of the fixed bracket (6). The middle parts of the two sliding locking sheet metals (10) are fixed to the longitudinal bracket (101) on the corresponding side by fixed lugs (12). The two sliding locking sheet metals (10) are provided with second guide grooves (13) extending forward and backward on the left and right sides, and the two strip extension sections (11) are provided with first guide grooves (14) extending forward and backward on the left and right sides. The locking bracket (9) is located between the two second connecting rods. (702) is horizontally rotatably connected to the cross hinge. The locking shaft (8) is transversely inserted in the locking bracket (9), each first guide groove (14) and each second guide groove (13). When the extension hinge mechanism (7) drives the footrest assembly (B) to move back and forth, it can also drive the locking bracket (9) to move back and forth, thereby driving the locking shaft (8) to move back and forth. When the footrest assembly (B) is in the storage position, the locking shaft (8) is located at the rear end of the first guide groove (14) and at the front end of the second guide groove (13). When the footrest assembly (B) moves backward, the locking shaft (8) can move forward relative to the first guide groove (14) and backward relative to the second guide groove (13) until it slides to the rear end of the second guide groove (13) to realize the backward sliding lock of the footrest assembly (B).

5. The automobile seat footrest extension and locking mechanism according to claim 4, characterized in that: When the locking shaft (8) slides to the rear end of the second guide groove (13), the locking shaft (8) slides to the front end of the first guide groove (14).

6. The automobile seat footrest extension and locking mechanism according to claim 4, characterized in that: The inner drawer rail (3) is integrally formed with the strip extension section (11), and the inner drawer rail (3) is located on the outside of the corresponding side strip extension section (11).

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