Stay wire type electric four-way leg support mechanism

Abstract

The invention 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 extension mechanism, the rotation and extension actions of the leg support can be realized only by using a single lead screw stepping motor, the space required by the arrangement of the leg support mechanism can be greatly saved, and the light weight of the seat is conveniently realized; the connecting rod mechanism is pushed to turn over and unfold through the lead screw motor, rotation and extension of the vehicle seat leg support can be completed through cooperation of the stay wire, the pulley and the sliding block, the overall 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, capable of effectively reducing the overall weight and manufacturing cost of the seat and easy to popularize.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle seat leg rests, and in particular relates to a pull-wire type electric four-way leg rest mechanism. Background Art

[0002] The current requirements for seat comfort in cars on the market have been further improved, and zero-gravity adjustment of seats has become a new highlight. Especially for MPVs or large SUVs, there are requirements for zero-gravity adjustment of the middle-row seats. Zero-gravity adjustment refers to lifting the front end of the seat so that the passenger's body weight is evenly released on the entire seat to avoid the formation of heavy pressure areas due to concentrated force. When the passenger lies flat, if there is no support from the leg rest, the legs will sag for a long time, resulting in insufficient blood supply and discomfort. Therefore, the leg rest mechanism is an essential key part to achieve zero-gravity adjustment of the seat.

[0003] The car seat leg rests on the market are generally two-way and four-way leg rests, among which the two-way leg rest can only realize the rotation or extension function, while the four-way leg rest can realize both rotation and extension functions at the same time; however, the four-way leg rest mechanism of the car seat in the prior art controls the above two actions respectively by two motors, that is, one motor drives the rotating mechanism to realize the rotation function, and the other motor drives the extension mechanism to realize the extension function. This solution has high requirements on the seat frame space and is not conducive to controlling the cost and weight of the seat. Summary of the invention

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

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A pull-wire electric four-way leg support mechanism, mainly comprising: a connecting rod deployment mechanism 100, an extension mechanism 200 and a reset module; the connecting rod deployment mechanism 100 comprises a leg support bracket 101 fixedly connected to a vehicle seat, a screw motor 102 is installed on the leg support bracket 101, the stepping screw end of the screw motor 102 is hinged to a driving bracket 103, the driving bracket 103 is fixedly installed on a horizontal axis 104, both sides of the horizontal axis 104 are fixedly connected with connecting rods 2 106, the middle parts of both sides of the leg support bracket 101 are hinged to the corresponding connecting rod 1 105 head end, the end of the connecting rod 105 is hinged to the corresponding connecting rod 3 107 head end, the connecting rod 2 106 head end is hinged to the leg on the same side The end of the support bracket 101 is hinged, the middle part of the second link 106 is hinged to the first middle hinge point of the third link 107, the end of the second link 106 is hinged to the corresponding first end of the fourth link 108, the second middle hinge point of the third link 107 is hinged to the first end of the fifth link 109, the end of the third link 107 is hinged to the end of the cross plate bracket 110, the end of the fourth link 108 is hinged to the middle part of the cross plate bracket 110, the outer side of the cross plate bracket 110 is fixedly connected with a slide groove end 111-1, the end of the fifth link 109 is hinged to the slider cross beam 112, the slider cross beam 112 is fixedly connected with a slider 115, and the slider 115 is slidably arranged in the slide groove opened on the cross plate 113;

[0007] The extension mechanism 200 includes a slider end 111-2 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 is fixedly connected to the cross plate 113 after passing through a pulley block, and a leg support half basin 206 is fixedly sleeved outside the front crossbeam 201 and the rear crossbeam 202;

[0008] The reset module includes a reset spring 205 , which is connected between the front cross beam 201 and the cross plate 113 and is used to cooperate with the pull wire 203 to realize the retraction and reset action of the leg support mechanism.

[0009] Preferably, the pulley group includes a first pulley 114-1 and a second pulley 114-2, the first pulley 114-1 is installed on the back side of the front end of the cross plate 113, the cross plate 113 is fixedly connected between the cross plate brackets 110 on both sides, the slider 115 is fixedly connected with the second pulley 114-2 after passing through the slide groove, and the first pulley 114-1 and the second pulley 114-2 are fixedly installed at corresponding positions by step screws 116.

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

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

[0012] Preferably, a plurality of sliding grooves are provided in parallel on the transverse plate 113 , and a plurality of sliding blocks 115 whose number matches the sliding grooves are fixedly connected to the crossbeam 112 .

[0013] Preferably, two ends of the pull wire 203 are fixedly connected to the rear cross beam 202 and the cross plate 113 respectively through corresponding fixing members 204 .

[0014] Preferably, 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 crossbeam 112 .

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

[0016] 1. The pull-wire electric four-way leg rest mechanism provided by the present invention can realize the two actions of leg rest rotation and extension by only a single screw stepping motor through the reasonable structural design of the connecting rod deployment mechanism and the extension mechanism, which can greatly save the space required for the arrangement of the leg rest mechanism and facilitate the lightweighting of the seat;

[0017] 2. The present invention uses a screw motor to push the connecting rod mechanism to flip and unfold, and cooperates with the pull wire, pulley and slider to complete the rotation and extension of the vehicle seat leg support. Its overall structure is compact, which can effectively reduce the volume of the leg support when it is stored, and solves the problem of storing the vehicle seat leg support in a small space in the vertical direction;

[0018] 3. The present invention is flexible to operate and easy to maintain, can effectively reduce the overall weight and manufacturing cost of the seat, and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an overall schematic diagram of the pull-wire electric four-way leg support mechanism of the present invention;

[0020] Figure 2 It is a schematic diagram of the pull-wire electric four-way leg support mechanism of the present invention after being unfolded;

[0021] Figure 3 It is a structural schematic diagram of the connecting rod deployment mechanism of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the extension mechanism of the present invention;

[0023] Figure 5 A cross-sectional view of the installation position of the slider of the present invention;

[0024] Figure 6 It is a schematic diagram of the wire drawing and winding of the present invention;

[0025] Figure 7 It is a side cross-sectional view of the leg support mechanism of the present invention when it is unfolded;

[0026] Figure 8 It is an internal cross-sectional view of the leg support mechanism of the present invention when it is unfolded;

[0027] Fig. 9 The figure is a motion principle diagram of the leg support mechanism of the present invention.

[0028] In the figure: 100, connecting rod deployment mechanism; 200, extension mechanism; 101, leg support bracket; 102, screw motor; 103, drive bracket; 104, horizontal axis; 105, connecting rod one; 106, connecting rod two; 107, connecting rod three; 108, connecting rod four; 109, connecting rod five; 110, cross plate bracket; 111-1, slide groove end; 111-2, slider end; 112, slider beam; 113, cross plate; 114-1, first pulley; 114-2, second pulley; 115, slider; 116, step screw; 201, front beam; 202, rear beam; 203, pull wire; 204, fixing piece; 205, return spring; 206, leg support half basin. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the application are usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] The features and performance of the present application are further described in detail below in conjunction with the embodiments.

[0034] Embodiment 1: This embodiment provides a pull-wire electric four-way leg support mechanism, such as Figures 1 to 8 As shown, it mainly includes: a connecting rod deployment mechanism 100, an extension mechanism 200 and a reset module;

[0035] Wherein, the connecting rod deployment mechanism 100 includes a leg support bracket 101 fixedly connected to the vehicle seat, a screw motor 102 is installed on the leg support bracket 101, the end of the stepping screw of the screw motor 102 is hinged to the driving bracket 103, the driving bracket 103 is fixedly installed on the horizontal axis 104, and the two sides of the horizontal axis 104 are fixedly connected with connecting rod two 106, the middle parts of both sides of the leg support bracket 101 are hinged to the corresponding connecting rod one 105 head end, the end of the connecting rod one 105 is hinged to the corresponding connecting rod three 107 head end, the head end of the connecting rod two 106 is hinged to the end of the leg support bracket 101 on the same side, and the middle of the connecting rod two 106 is hinged to the end of the leg support bracket 101 on the same side. The end of the connecting rod 106 is hinged to the first middle hinge point of the corresponding connecting rod 4 108, the second middle hinge point of the connecting rod 3 107 is hinged to the first end of the connecting rod 5 109, the end of the connecting rod 3 107 is hinged to the end of the cross plate bracket 110, the end of the connecting rod 4 108 is hinged to the middle part of the cross plate bracket 110, the outer side of the cross plate bracket 110 is fixedly connected with a slide groove end 111-1, the end of the connecting rod 5 109 is hinged to the slider cross beam 112, the slider cross beam 112 is fixedly connected with a slider 115, and the slider 115 is slidably arranged in the slide groove opened on the cross plate 113;

[0036] Further, the extension mechanism 200 includes a slider end 111-2 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 is fixedly connected to the cross plate 113 after passing through a pulley block, and 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 cross beam 201 and the cross plate 113 and is used to cooperate with the pull wire 203 to realize the retraction and reset action of the leg support mechanism.

[0038] Furthermore, the pulley group 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 cross plate 113, the cross plate 113 is fixedly connected between the cross plate brackets 110 on both sides, the slider 115 passes through the slide groove and is fixedly connected to the second pulley 114-2, and the first pulley 114-1 and the second pulley 114-2 are fixedly installed at corresponding positions by step screws 116.

[0039] Furthermore, one end of the pull wire 203 is fixedly connected to the rear cross beam 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, a plurality of return springs 205 arranged in parallel are connected between the front cross beam 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 mounted on the vehicle seat through the mounting holes.

[0042] Furthermore, a plurality of sliding grooves are provided in parallel on the transverse plate 113 , and a plurality of sliding blocks 115 whose number matches the sliding grooves are fixedly connected to the crossbeam 112 .

[0043] Furthermore, two ends of the pull wire 203 are respectively fixedly connected to the rear cross beam 202 and the cross plate 113 through corresponding fixing members 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 fixed on the slider crossbeam 112 .

[0045] Embodiment 2: This embodiment provides a pull-wire type electric four-way leg support mechanism, such as Figure 3As shown, the connecting rod deployment mechanism 100 is the active mechanism of the leg rest mechanism. Since the leg rest mechanism is basically a symmetrical structure, this embodiment only describes its structural features from one side: the function of the leg rest bracket 101 is to connect with the seat, so a mounting hole is provided on it; the screw motor 102 is fixed on the leg rest bracket 101, and the end of its stepping screw is hinged to the driving bracket 103, and the driving bracket 103 is fixed on the horizontal axis 104, and the horizontal axis 104 spans the connecting rod 2 106 that is fixed on both sides; the head end of the connecting rod 1 105 is hinged to the middle part of the leg rest bracket 101, and the end is hinged to the head end of the connecting rod 3 107; the head end of the connecting rod 2 106 is hinged to the leg rest bracket 101. The end of the bracket 101 is hinged, the middle end is hinged to the first middle hinge point of the connecting rod three 107, and the end is hinged to the head end of the connecting rod four 108; the second middle hinge point of the connecting rod three 107 is hinged to the head end of the connecting rod five 109, and the end hinge point is hinged to the end of the cross plate bracket 110; the end hinge point of the connecting rod four 108 is hinged to the middle part of the cross plate bracket 110; the end of the connecting rod five 109 is hinged to the slider crossbeam 112; the slider crossbeam 112 is fixedly connected with a slider 115 (in this embodiment, two sliders are specifically used, and the slider can be only one or more).

[0046] Furthermore, the slider 115 is located in the slide groove provided on the cross plate 113, and the slider 115 can slide forward and backward along the slide groove. The cross plate 113 spans between the cross plate brackets 110 fixedly connected on both sides, and a first pulley 114-1 is installed on the back of the front end (the center of the pulley shaft is fixed by step screws in this solution); after the slider 115 passes through the slide groove, the second pulley 114-2 is installed on the slider 115 and pressed on the slide groove of the cross plate 113, and the step screws 116 pass through the second pulley 114-2, the cross plate 113, and the slider 115 respectively and then fixed on the slider cross beam 112, while fixing the slider 115, the center of the shaft of the first pulley 114-1 is also fixed. In addition to being hinged to the ends of the connecting rod 3 107 and the connecting rod 4 108 and fixedly connected to the cross plate 113, the cross plate bracket 110 is also fixedly connected to the slide groove end 111-1.

[0047] Further, such as Figures 4 to 6 As shown, the extension mechanism 200 is composed 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 fixedly connected to the front and rear ends of the slider end 111-2, and the slider end 111-2 can slide forward and backward along the track on the slide groove end 111-1; one end of the pull wire 203 is fixed to the rear crossbeam 202, and is wound forward through the first pulley 114-1, and then wound backward through the second pulley 114-2, and finally extends forward and is fixed on the horizontal plate 113 of the unfolding mechanism 100 (see Figure 6); the front end of the return spring 205 is connected to the front beam 201, and the rear end is connected to the cross plate 113, which plays a resetting role; the leg support half basin 206 is fixedly connected to the front beam 201 and the rear beam 202.

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

[0049] When used specifically:

[0050] like Figures 7 to 9 As shown, the screw motor 102 pushes the connecting rod mechanism to unfold, so that the angle between the connecting rod 3 107 and the horizontal plate bracket 110 changes, driving the connecting rod 5 109 to move backward along the slide groove on the horizontal plate 113, and at the same time, the slider 115 and the second pulley 114-2 move backward along the slide groove; because the length of the pull wire 203 is constant, it can drag the rear crossbeam 202 of the extension mechanism 200 to move forward, so that the slider end 111-2 extends forward along the track of the slide groove end 111-1, thereby completing the rotation and extension of the leg support. When resetting, the connecting rod unfolding mechanism 100 is driven to retract by the screw motor 102, and at the same time, the reset spring 205 pulls the extended extension mechanism 200 back by the spring tension to complete the retraction and reset of the leg support.

[0051] Embodiment 3: Based on the same inventive concept, this embodiment further provides a vehicle seat, wherein the vehicle seat comprises the pull-wire type electric four-way leg support mechanism as described above.

[0052] Furthermore, all parts involved in this application that are not described in detail are the same as the prior art or are implemented using the prior art.

[0053] In summary:

[0054] 1. The pull-wire electric four-way leg rest mechanism provided by the present invention can realize the two actions of leg rest rotation and extension by only a single screw stepping motor through the reasonable structural design of the connecting rod deployment mechanism and the extension mechanism, which can greatly save the space required for the arrangement of the leg rest mechanism and facilitate the lightweighting of the seat;

[0055] 2. The present invention uses a screw motor to push the connecting rod mechanism to flip and unfold, and cooperates with the pull wire, pulley and slider to complete the rotation and extension of the vehicle seat leg support. Its overall structure is compact, which can effectively reduce the volume of the leg support when it is stored, and solves the problem of storing the vehicle seat leg support in a small space in the vertical direction;

[0056] 3. The present invention is flexible to operate and easy to maintain, can effectively reduce the overall weight and manufacturing cost of the seat, and is easy to promote.

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

Claims

1. A pull-wire electric four-way leg support mechanism, characterized in that: The invention comprises a connecting rod deployment mechanism (100), an extension mechanism (200) and a reset module; the connecting rod deployment mechanism (100) comprises a leg support bracket (101) fixedly connected to a vehicle seat, a screw motor (102) is installed on the leg support bracket (101), the end of the stepping screw of the screw motor (102) is hinged to a driving bracket (103), the driving bracket (103) is fixedly installed on a transverse axis (104), both sides of the transverse axis (104) are fixedly connected with connecting rod two (106), the middle parts of both sides of the leg support bracket (101) are hinged to the corresponding connecting rod one (105) head end, the end of the connecting rod one (105) is hinged to the corresponding connecting rod three (107) head end, the connecting rod two (106) head end is hinged to The end of the leg support bracket (101) on the same side is hinged, the middle part of the second connecting rod (106) is hinged to the first middle hinge point of the third connecting rod (107), the end of the second connecting rod (106) is hinged to the corresponding first end of the fourth connecting rod (108), the second middle hinge point of the third connecting rod (107) is hinged to the first end of the fifth connecting rod (109), the end of the third connecting rod (107) is hinged to the end of the cross plate bracket (110), the end of the fourth connecting rod (108) is hinged to the middle part of the cross plate bracket (110), the end of the fifth connecting rod (109) is hinged to the slider cross beam (112), a slider (115) is fixedly connected to the slider cross beam (112), and the slider (115) is slidably arranged in a slide groove provided on the cross plate (113); The extension mechanism (200) is a slider slide groove structure, comprising a slide groove end (111-1) and a slider end (111-2), wherein the slide groove end (111-1) is fixedly connected to the outside of the cross plate bracket (110), and 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), and one end of a pull wire (203) is fixedly connected to the rear cross beam (202), and the other end of the pull wire (203) is fixedly connected to the cross plate (113) after passing through a pulley block, and the front cross beam (201) and the rear cross beam (202) are externally fixedly sleeved with a leg support half basin (206); The resetting module is connected between the connecting rod deployment mechanism (100) and the extension mechanism (200) and is used to realize the retraction and resetting action of the leg support mechanism.

2. The pull-wire electric four-way leg support mechanism according to claim 1, characterized in that: The pulley block comprises a first pulley (114-1) and a second pulley (114-2); the first pulley (114-1) is mounted on the back of the front end of the transverse plate (113); the transverse plate (113) is fixedly connected between transverse plate brackets (110) on both sides; the slider (115) is fixedly connected to the second pulley (114-2) after passing through the slide groove; and the first pulley (114-1) and the second pulley (114-2) are both fixedly mounted at corresponding positions by step screws (116).

3. The pull-wire 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 cross beam (202), and the other end is fixedly connected to the cross plate (113) after winding around the first pulley (114-1) and the second pulley (114-2) in sequence.

4. The pull-wire electric four-way leg support mechanism according to claim 1, characterized in that: A plurality of return springs (205) arranged in parallel are connected between the front cross beam (201) and the cross plate (113).

5. The pull-wire electric four-way leg support mechanism according to claim 1, characterized in that: The transverse plate (113) is provided with a plurality of sliding grooves in parallel, and the crossbeam (112) is fixedly connected with a plurality of sliding blocks (115) whose number matches the sliding grooves.

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

7. The pull-wire electric four-way leg support mechanism according to claim 2, characterized in that: 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 on the slider crossbeam (112).

8. A vehicle seat, characterized in that: It comprises a pull-wire type electric four-way leg support mechanism as described in any one of claims 1 to 7.

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