Stay wire type electric four-way leg support mechanism

Abstract

The utility model belongs to the technical field of vehicle seat leg supports, and particularly relates to a stay wire type electric four-way leg support mechanism. Through the reasonable structural design of the connecting rod unfolding mechanism and the extending mechanism, the leg support can rotate and stretch out and draw back only through a single lead screw stepping motor, the space needed by arrangement of the leg support mechanism can be greatly saved, and light weight of a seat can be achieved conveniently; the connecting rod mechanism is pushed by the lead screw motor to turn over and unfold, and the stay wire, the pulley and the sliding block are matched, so that rotation and extension of the vehicle seat leg support can be completed, the whole structure is compact, the size of the leg support during storage can be effectively reduced, and the storage problem of the vehicle seat leg support in a small space in the vertical direction is solved; the seat is flexible to operate, convenient to maintain and easy to popularize, and the overall weight and the manufacturing cost of the seat can be effectively reduced.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle seat leg support technology, specifically relating to a cable-operated electric four-way leg support mechanism. Background Technology

[0002] Currently, the demand for seat comfort in automobiles is increasing, with zero-gravity seat adjustment becoming a new highlight. This is especially true for MPVs and large SUVs, where zero-gravity adjustment is now a requirement for middle-row seats. Zero-gravity adjustment refers to raising the front of the seat, allowing the passenger's weight to be evenly distributed across the entire seat, avoiding concentrated pressure zones. When passengers are lying down, without leg support, their legs dangling for extended periods can lead to insufficient blood supply and discomfort. Therefore, leg support mechanisms are an essential component for achieving zero-gravity seat adjustment.

[0003] Car seat leg rests on the market are generally two-way or four-way. Two-way leg rests can only achieve one of the functions of rotation or extension, while four-way leg rests can achieve both rotation and extension functions simultaneously. However, the existing four-way leg rest mechanism of car seats uses two motors to control the two functions separately. That is, one motor drives the rotation mechanism to achieve the rotation function, and the other motor drives the extension mechanism to achieve the extension function. This solution has high requirements for seat frame space and is not conducive to controlling the cost and weight of the seat. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a pull-wire type electric four-way leg support mechanism, which has a compact structure and is easy to use. It can realize the rotation and extension of the vehicle seat leg support through a single screw motor, which can save a lot of space required for the arrangement of the leg support mechanism and facilitate the lightweighting of the seat.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A pull-wire type electric four-way leg support mechanism mainly includes: a linkage deployment mechanism 100, an extension mechanism 200, and a reset module; the linkage deployment mechanism 100 includes a leg support bracket 101 fixedly connected to a vehicle seat, a lead screw motor 102 mounted on the leg support bracket 101, the end of the stepper screw of the lead screw motor 102 being hinged to a drive bracket 103, the drive bracket 103 being fixedly mounted on a horizontal shaft 104, and connecting rods 106 fixedly connected to both sides of the horizontal shaft 104; the middle of both sides of the leg support bracket 101 is hinged to the beginning of a corresponding connecting rod 105, the end of connecting rod 105 is hinged to the beginning of a corresponding connecting rod 107, and the beginning of connecting rod 106 is connected to the leg support on the same side. The support bracket 101 is hinged at the end. The middle part of the second connecting rod 106 is hinged to the first intermediate hinge point of the third connecting rod 107. The end of the second connecting rod 106 is hinged to the beginning of the corresponding fourth connecting rod 108. The second intermediate hinge point of the third connecting rod 107 is hinged to the beginning of the fifth connecting rod 109. The end of the third connecting rod 107 is hinged to the end of the horizontal plate support 110. The end of the fourth connecting rod 108 is hinged to the middle of the horizontal plate support 110. A sliding groove end 111-1 is fixedly connected to the outside of the horizontal plate support 110. The end of the fifth connecting rod 109 is hinged to the slider beam 112. A slider 115 is fixedly connected to the slider beam 112. The slider 115 is slidably disposed in the sliding groove opened on the horizontal plate 113.

[0007] The extension mechanism 200 is a slider-slide groove structure, including a slide groove end 111-1 and a slider end 111-2 that is slidably sleeved outside the slide groove end 111-1. The slide groove end 111-1 is fixedly connected to the outside of the horizontal plate bracket 110. The front and rear parts of the slider end 111-2 are respectively fixedly connected to a front crossbeam 201 and a rear crossbeam 202. One end of a pull wire 203 is fixedly connected to the rear crossbeam 202. The other end of the pull wire 203 passes around the pulley group and is fixedly connected to the horizontal plate 113. A leg support half basin 206 is fixedly sleeved outside the front crossbeam 201 and the rear crossbeam 202.

[0008] The reset module is connected between the connecting rod unfolding mechanism 100 and the extension mechanism 200. Specifically, the reset module includes a reset spring 205, which is connected between the front crossbeam 201 and the cross plate 113 and is used to cooperate with the pull cable 203 to realize the retraction and return action of the leg support mechanism.

[0009] Preferably, the pulley assembly includes a first pulley 114-1 and a second pulley 114-2. The first pulley 114-1 is installed on the back of the front end of the horizontal plate 113. The horizontal plate 113 is fixedly connected between the horizontal plate supports 110 on both sides. The slider 115 passes through the slide groove and is fixedly connected to the second pulley 114-2. The first pulley 114-1 and the second pulley 114-2 are both fixedly installed in their respective positions by step screws 116.

[0010] Preferably, one end of the pull wire 203 is fixedly connected to the rear crossbeam 202, and the other end is fixedly connected to the cross plate 113 after passing through the first pulley 114-1 and the second pulley 114-2 in sequence.

[0011] Preferably, a plurality of parallel return springs 205 are connected between the front crossbeam 201 and the cross plate 113.

[0012] Preferably, the horizontal plate 113 has multiple parallel grooves, and the slider beam 112 has multiple sliders 115 of a number that match the grooves.

[0013] Preferably, the two ends of the pull wire 203 are fixedly connected to the rear crossbeam 202 and the cross plate 113 respectively by corresponding fasteners 204.

[0014] Preferably, the stepped screw 116 passes through the second pulley 114-2, the cross plate 113 and the slider 115 in sequence and is then fixed to the slider beam 112.

[0015] Compared with the prior art, the present invention has the following main advantages:

[0016] 1. The present invention provides a pull-wire type electric four-way leg support mechanism. Through the reasonable structural design of the linkage unfolding mechanism and the extension mechanism, it can realize the two actions of leg support rotation and extension with only a single lead screw stepper motor, which can save a lot of space required for the arrangement of the leg support mechanism and facilitate the lightweighting of the seat.

[0017] 2. This utility model uses a lead screw motor to drive the linkage mechanism to flip and unfold, and through the cooperation of pull wire, pulley and slider, the rotation and extension of the vehicle seat leg rest can be completed. Its overall structure is compact, which can effectively reduce the volume of the leg rest when stored, and solve the problem of storing the car seat leg rest in a small vertical space.

[0018] 3. This utility model is flexible in operation, easy to maintain, and can effectively reduce the overall weight and manufacturing cost of the seat, making it easy to promote. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall design of the pull-wire electric four-way leg support mechanism of this utility model;

[0020] Figure 2 This is a schematic diagram of the cable-operated electric four-way leg support mechanism of this utility model after it has been unfolded.

[0021] Figure 3 This is a schematic diagram of the linkage deployment mechanism of this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the extension mechanism of this utility model;

[0023] Figure 5 A cross-sectional view showing the mounting position of the slider in this utility model;

[0024] Figure 6 This is a schematic diagram of the wire winding of this utility model;

[0025] Figure 7 This is a side sectional view of the leg support mechanism of this utility model when it is unfolded;

[0026] Figure 8 This is an internal sectional view of the leg support mechanism of this utility model when it is unfolded;

[0027] Figure 9 This is a schematic diagram illustrating the motion principle of the leg support mechanism of this utility model.

[0028] In the diagram: 100, Linkage unfolding mechanism; 200, Extension mechanism; 101, Leg support bracket; 102, Lead screw motor; 103, Drive bracket; 104, Horizontal shaft; 105, Link 1; 106, Link 2; 107, Link 3; 108, Link 4; 109, Link 5; 110, Horizontal plate bracket; 111-1, Slide groove end; 111-2, Slider end; 112, Slider beam; 113, Horizontal plate; 114-1, First pulley; 114-2, Second pulley; 115, Slider; 116, Step screw; 201, Front beam; 202, Rear beam; 203, Pull cable; 204, Fixing component; 205, Return spring; 206, Leg support half-basin. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0034] Example 1: This example provides a pull-wire type electric four-way leg support mechanism, such as... Figures 1-8 As shown, it mainly includes: a linkage deployment mechanism 100, an extension mechanism 200, and a reset module;

[0035] The linkage deployment mechanism 100 includes a leg support bracket 101 fixedly connected to the vehicle seat. A lead screw motor 102 is mounted on the leg support bracket 101. The end of the stepper lead screw of the lead screw motor 102 is hinged to a drive bracket 103. The drive bracket 103 is fixedly mounted on a horizontal shaft 104. Connecting rods 106 are fixedly connected to both sides of the horizontal shaft 104. The middle of both sides of the leg support bracket 101 is hinged to the beginning of the corresponding connecting rod 105. The end of the connecting rod 105 is hinged to the beginning of the corresponding connecting rod 107. The beginning of the connecting rod 106 is hinged to the end of the leg support bracket 101 on the same side. The first intermediate hinge point of the connecting rod 107 is hinged to the second intermediate hinge point of the connecting rod 107. The end of the connecting rod 106 is hinged to the beginning of the corresponding connecting rod 108. The second intermediate hinge point of the connecting rod 107 is hinged to the beginning of the connecting rod 109. The end of the connecting rod 107 is hinged to the end of the horizontal plate support 110. The end of the connecting rod 108 is hinged to the middle of the horizontal plate support 110. A sliding groove end 111-1 is fixedly connected to the outside of the horizontal plate support 110. The end of the connecting rod 109 is hinged to the slider beam 112. A slider 115 is fixedly connected to the slider beam 112. The slider 115 is slidably disposed in the sliding groove opened on the horizontal plate 113.

[0036] Furthermore, the extension mechanism 200 includes a slider end 111-2 that is slidably sleeved outside the slide groove end 111-1. The front and rear parts of the slider end 111-2 are respectively fixedly connected to a front crossbeam 201 and a rear crossbeam 202. One end of a pull wire 203 is fixedly connected to the rear crossbeam 202. The other end of the pull wire 203 passes around the pulley group and is fixedly connected to the cross plate 113. A leg support half basin 206 is fixedly sleeved outside the front crossbeam 201 and the rear crossbeam 202.

[0037] The reset module includes a reset spring 205, which is connected between the front crossbeam 201 and the cross plate 113 and is used to cooperate with the pull cable 203 to realize the retraction and return action of the leg support mechanism.

[0038] Furthermore, the pulley assembly includes a first pulley 114-1 and a second pulley 114-2. The first pulley 114-1 is installed on the back of the front end of the horizontal plate 113. The horizontal plate 113 is fixedly connected between the horizontal plate supports 110 on both sides. The slider 115 passes through the slide groove and is fixedly connected to the second pulley 114-2. The first pulley 114-1 and the second pulley 114-2 are both fixedly installed in their respective positions by step screws 116.

[0039] Furthermore, one end of the pull wire 203 is fixedly connected to the rear crossbeam 202, and the other end is fixedly connected to the cross plate 113 after passing through the first pulley 114-1 and the second pulley 114-2 in sequence.

[0040] Furthermore, multiple parallel reset springs 205 are connected between the front crossbeam 201 and the cross plate 113.

[0041] Furthermore, mounting holes are provided on both sides of the leg support bracket 101, and the leg support bracket 101 is fixedly installed on the vehicle seat through the mounting holes.

[0042] Furthermore, multiple sliding grooves are provided parallel to each other on the horizontal plate 113, and multiple sliders 115 of a number adapted to the sliding grooves are fixedly connected to the slider beam 112.

[0043] Furthermore, the two ends of the pull wire 203 are respectively fixedly connected to the rear crossbeam 202 and the cross plate 113 by corresponding fasteners 204 (specifically rivets or threaded bolt connectors, etc.).

[0044] Furthermore, the step screw 116 passes through the second pulley 114-2, the cross plate 113 and the slider 115 in sequence and is then fixed to the slider beam 112.

[0045] Example 2: This example provides a pull-wire type electric four-way leg support mechanism, such as... Figure 3 As shown, the linkage deployment mechanism 100 is the active mechanism of the leg support mechanism. Since the leg support mechanism is basically a symmetrical structure, this embodiment only describes its structural features on one side: the leg support bracket 101 is used to connect to the seat, therefore it has mounting holes; the lead screw motor 102 is fixed to the leg support bracket 101, and the end of its stepping lead screw is hinged to the drive bracket 103, which is fixed to the horizontal shaft 104. The horizontal shaft 104 spans the connecting rods 106 on both sides; the first end of the first connecting rod 105 is hinged to the middle of the leg support bracket 101, and its end is hinged to the first end of the third connecting rod 107; the first end of the second connecting rod 106 is connected to the leg support... The bracket 101 is hinged at its end, and its middle end is hinged to the first intermediate hinge point of the connecting rod 3 107, and its end is hinged to the beginning end of the connecting rod 4 108; the second intermediate hinge point of the connecting rod 3 107 is hinged to the beginning end of the connecting rod 5 109, and its end hinge point is hinged to the end of the horizontal plate bracket 110; the end hinge point of the connecting rod 4 108 is hinged to the middle of the horizontal plate bracket 110; the end of the connecting rod 5 109 is hinged to the slider beam 112; a slider 115 is fixedly connected to the slider beam 112 (in this embodiment, two sliders are specifically used, but there can be only one slider or more sliders).

[0046] Furthermore, the slider 115 is located within a groove on the horizontal plate 113, and can slide back and forth along the groove. The horizontal plate 113 spans and is fixed between the horizontal plate supports 110 on both sides, and a first pulley 114-1 is installed on the back of its front end (in this design, the pulley's pivot center is fixed by a stepped screw). After the slider 115 passes through the groove, a second pulley 114-2 is installed on the slider 115 and presses against the groove of the horizontal plate 113. The second pulley 114-2 is fixed to the slider beam 112 by the stepped screw 116 passing through the second pulley 114-2, the horizontal plate 113, and the slider 115 respectively. While fixing the slider 115, the pivot center of the first pulley 114-1 is also fixed. In addition to being hinged to the ends of connecting rods 3 107 and 4 108 and fixed to the horizontal plate 113, the horizontal plate support 110 is also fixed to the groove end 111-1.

[0047] Furthermore, such as Figures 4-6 As shown, the extension mechanism 200 consists of a slider end 111-2, a front crossbeam 201, a rear crossbeam 202, a pull wire 203, a fixing member 204, and a leg support half-basin 206; the front crossbeam 201 and the rear crossbeam 202 are respectively fixed to the front and rear ends of the slider end 111-2, and the slider end 111-2 can slide back and forth along the track on the slide groove end 111-1; one end of the pull wire 203 is fixed to the rear crossbeam 202, passes forward around the first pulley 114-1, then passes backward around the second pulley 114-2, and finally extends forward and is fixed to the horizontal plate 113 of the unfolding mechanism 100 (see...). Figure 6 The return spring 205 is connected to the front crossbeam 201 at the front end and to the cross plate 113 at the rear end, and plays a role in resetting; the leg support half basin 206 is fixedly connected to the front crossbeam 201 and the rear crossbeam 202.

[0048] Furthermore, one end of the pull wire 203 is fixed to the rear crossbeam 202, passes forward around the first pulley 114-1, then passes backward around the second pulley 114-2, and finally extends forward and is fixed to the cross plate 113 of the rotating mechanism 100.

[0049] In practical use:

[0050] like Figures 7-9As shown, the lead screw motor 102 drives the linkage mechanism to unfold, causing a change in the angle between the connecting rod 107 and the cross plate support 110. This drives the connecting rod 109 to move backward along the groove on the cross plate 113, simultaneously causing the slider 115 and the second pulley 114-2 to move backward along the groove. Since the length of the pull wire 203 is constant, it can drag the rear cross beam 202 of the extension mechanism 200 forward, so that the slider end 111-2 extends forward along the track of the groove end 111-1, thereby completing the rotation and extension action of the leg support. During reset, the lead screw motor 102 drives the linkage unfolding mechanism 100 to retract, and at the same time, the reset spring 205 pulls back the extended extension mechanism 200 by the spring force, thus completing the retraction and reset action of the leg support.

[0051] Example 3: Based on the same inventive concept, this example also provides a vehicle seat, which includes the cable-operated electric four-way leg support mechanism as described above.

[0052] Furthermore, all parts of this application that are not described in detail are the same as or implemented using existing technology.

[0053] In summary:

[0054] 1. The present invention provides a pull-wire type electric four-way leg support mechanism. Through the reasonable structural design of the linkage unfolding mechanism and the extension mechanism, it can realize the two actions of leg support rotation and extension with only a single lead screw stepper motor, which can save a lot of space required for the arrangement of the leg support mechanism and facilitate the lightweighting of the seat.

[0055] 2. This utility model uses a lead screw motor to drive the linkage mechanism to flip and unfold, and through the cooperation of pull wire, pulley and slider, the rotation and extension of the vehicle seat leg rest can be completed. Its overall structure is compact, which can effectively reduce the volume of the leg rest when stored, and solve the problem of storing the car seat leg rest in a small vertical space.

[0056] 3. This utility model is flexible in operation, easy to maintain, and can effectively reduce the overall weight and manufacturing cost of the seat, making it easy to promote.

[0057] The above embodiments are only used to illustrate the design concept and features of this utility model, and their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. The protection scope of this utility model is not limited to the above embodiments. Therefore, all equivalent changes or modifications made based on the principles and design ideas disclosed in this utility model are within the protection scope of this utility model.

Claims

1. A pull-wire type electric four-way leg support mechanism, characterized in that: The system includes a linkage deployment mechanism (100), an extension mechanism (200), and a reset module. The linkage deployment mechanism (100) includes a leg support bracket (101) fixedly connected to a vehicle seat. A lead screw motor (102) is mounted on the leg support bracket (101). The end of the stepper screw of the lead screw motor (102) is hinged to a drive bracket (103). The drive bracket (103) is fixedly mounted on a horizontal shaft (104). Linkages 2 (106) are fixedly connected to both sides of the horizontal shaft (104). The middle of both sides of the leg support bracket (101) is hinged to the beginning of the corresponding link 1 (105). The end of the link 1 (105) is hinged to the beginning of the corresponding link 3 (107). The beginning of the link 2 (106) is hinged to... The end of the leg support bracket (101) on the same side is hinged. The middle part of the second link (106) is hinged to the first intermediate hinge point of the third link (107). The end of the second link (106) is hinged to the beginning of the corresponding fourth link (108). The second intermediate hinge point of the third link (107) is hinged to the beginning of the fifth link (109). The end of the third link (107) is hinged to the end of the horizontal plate bracket (110). The end of the fourth link (108) is hinged to the middle part of the horizontal plate bracket (110). The end of the fifth link (109) is hinged to the slider beam (112). A slider (115) is fixedly connected to the slider beam (112). The slider (115) is slidably disposed in the groove opened on the horizontal plate (113). The extension mechanism (200) is a slider-slide structure, including a slide end (111-1) and a slider end (111-2). The slide end (111-1) is fixedly connected to the outside of the cross plate support (110). The front and rear parts of the slider end (111-2) are respectively fixedly connected to a front cross beam (201) and a rear cross beam (202). One end of a pull wire (203) is fixedly connected to the rear cross beam (202). The other end of the pull wire (203) passes around the pulley group and is fixedly connected to the cross plate (113). Leg support half basins (206) are fixedly sleeved on the outside of the front cross beam (201) and the rear cross beam (202). The reset module is connected between the link unfolding mechanism (100) and the extension mechanism (200) to realize the retraction and return action of the leg support mechanism.

2. The pull-wire type electric four-way leg support mechanism according to claim 1, characterized in that: The pulley assembly includes a first pulley (114-1) and a second pulley (114-2). The first pulley (114-1) is installed on the back of the front end of the horizontal plate (113). The horizontal plate (113) is fixedly connected between the horizontal plate supports (110) on both sides. The slider (115) passes through the groove and is fixedly connected to the second pulley (114-2). The first pulley (114-1) and the second pulley (114-2) are both fixedly installed in their respective positions by step screws (116).

3. The pull-wire type electric four-way leg support mechanism according to claim 2, characterized in that: One end of the pull wire (203) is fixedly connected to the rear crossbeam (202), and the other end is fixedly connected to the cross plate (113) after passing through the first pulley (114-1) and the second pulley (114-2) in sequence.

4. The pull-wire type electric four-way leg support mechanism according to claim 1, characterized in that: Multiple parallel reset springs (205) are connected between the front crossbeam (201) and the cross plate (113).

5. A pull-wire type electric four-way leg support mechanism according to claim 1, characterized in that: Multiple sliding grooves are provided parallel to each other on the horizontal plate (113), and multiple sliders (115) of the same number as the sliding grooves are fixedly connected to the slider beam (112).

6. A pull-wire type electric four-way leg support mechanism according to claim 3, characterized in that: The two ends of the pull wire (203) are fixedly connected to the rear crossbeam (202) and the cross plate (113) respectively by corresponding fasteners (204).

7. A pull-wire type electric four-way leg support mechanism according to claim 2, characterized in that: The stepped screw (116) passes through the second pulley (114-2), the cross plate (113) and the slider (115) in sequence and is then fixed to the slider beam (112).

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