Ratchet wheel type leg support

Abstract

The utility model relates to the technical field of automobile accessories, and particularly discloses a ratchet wheel type leg support, which comprises a leg support fixing piece, a ratchet wheel and a ratchet wheel, the leg supporting plate is used for supporting legs and / or feet of a human body; the hand-driven ratchet wheel assembly is mounted on the leg supporting plate; one end of the tension spring connecting rod assembly is hinged to the leg support fixing piece, and the other end of the tension spring connecting rod assembly is connected with the leg supporting plate through the hand-driven ratchet wheel assembly; wherein the leg supporting plate has a storage state that the leg supporting plate is kept close to the position of the leg support fixing piece under the limiting effect of the hand-driven ratchet wheel assembly; in the extending state, after the limiting effect of the hand-driven ratchet wheel assembly is relieved, the leg support fixing piece rotates in the direction away from the leg support fixing piece under the elastic pulling force effect of the tension spring connecting rod assembly. According to the ratchet wheel type leg support provided by the utility model, the leg support can be conveniently extended and stored through mechanical design, the cost is effectively reduced, and the reliability and the user experience are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile products, especially to a ratchet type leg rest. BACKGROUND

[0002] With the rapid development of the automobile industry and the continuous pursuit of driving comfort by consumers, the configuration of automobile seats is increasingly rich, and the leg rest, as an important component to improve the comfort of riding, has been widely used in the design of high-end automobile seats. Traditional automobile leg rests mostly adopt electric drive mode, and the extension and storage of the leg rest are realized through motor control to meet the needs of different passengers.

[0003] However, the electric leg rest structure is complex, and the motor and its control system are costly, which not only increases the production cost of automobile manufacturers, but also increases the purchase cost of consumers. In addition, electric devices may have failure risks during use and need regular maintenance, which brings inconvenience to users. Therefore, there is an urgent need in the market for a new leg rest structure that is simple in structure, low in cost and can realize the extension and storage of the leg rest without electric devices.

[0004] The utility model aims at providing a leg rest structure without electric devices, which realizes the convenient extension and storage of the leg rest through mechanical design, effectively reduces the cost, and improves the reliability and user experience.

[0005] The above information disclosed in the background section is only included to enhance the understanding of the background of the present disclosure, and therefore can contain information that is not prior art known to those of ordinary skill in the art at the present time. SUMMARY

[0006] One purpose of the utility model is to provide a ratchet type leg rest, which can realize the convenient extension and storage of the leg rest through mechanical design, effectively reduce the cost, and improve the reliability and user experience.

[0007] To achieve the above purpose, the utility model provides a ratchet type leg rest, which comprises:

[0008] A leg rest fixing part is used to connect with the seat body;

[0009] A leg supporting plate is used to support the legs and feet of the human body;

[0010] A hand-driven ratchet assembly is installed on the leg supporting plate;

[0011] A tension spring connecting rod assembly is hinged at one end to the leg rest fixing part and connected at the other end to the leg supporting plate through the hand-driven ratchet assembly;

[0012] The leg supporting plate has a receiving state in which the leg supporting plate is kept close to the leg supporting fixing part by the limiting action of the hand-driven ratchet wheel assembly; and an extending state in which the leg supporting plate is rotated away from the leg supporting fixing part by the elastic pulling force of the pulling spring connecting rod assembly after the limiting action of the hand-driven ratchet wheel assembly is released.

[0013] Optionally, the hand-driven ratchet wheel assembly comprises:

[0014] A ratchet wheel base is fixed to the bottom of the leg supporting plate.

[0015] A rotating gear is rotatably installed in the middle of the ratchet wheel base.

[0016] A limiting ratchet plate is located at the side of the rotating gear, and one end of the limiting ratchet plate away from the rotating gear is rotatably connected with the ratchet wheel base.

[0017] A ratchet plate pulling spring is connected with the middle of the limiting ratchet plate and the bottom of the leg supporting plate at two ends, respectively, for driving the other end of the limiting ratchet plate to rotate towards the rotating gear and be clamped into the gear teeth of the rotating gear to limit the forward rotation of the rotating gear.

[0018] An unlocking rotating lever is rotatably connected with the ratchet wheel base, for driving the other end of the limiting ratchet plate to rotate away from the rotating gear and be disengaged from the gear teeth of the rotating gear to release the rotation limitation of the rotating gear after being driven.

[0019] Optionally, the unlocking rotating lever comprises:

[0020] A rotating cap is located outside the leg supporting plate.

[0021] A rotating lever body is rotatably connected with the ratchet wheel base at one end and extends to the side of the limiting ratchet plate close to the bottom surface of the leg supporting plate, and the other end of the rotating lever body extends to be fixedly connected with the rotating cap.

[0022] An unlocking boss is located on the rotating lever body at a position corresponding to the limiting ratchet plate, for rotating with the rotating lever body to abut against the limiting ratchet plate after being driven by the rotating cap, so that the other end of the limiting ratchet plate rotates away from the rotating gear and is disengaged from the gear teeth of the rotating gear.

[0023] Optionally, the limiting ratchet plate is provided with an arc-shaped limiting slot at a position corresponding to the unlocking boss for clamping the unlocking boss.

[0024] Optionally, the pulling spring connecting rod assembly comprises:

[0025] The first three-rotation piece is provided with a first rotation shaft, a second rotation shaft and a third rotation shaft arranged in a triangle; wherein the leg support fixing piece is hingedly connected with the first three-rotation piece through the first rotation shaft;

[0026] The first double-rotation piece is hingedly connected with the first three-rotation piece through the second rotation shaft at one end thereof;

[0027] The second double-rotation piece is hingedly connected with the first three-rotation piece through the third rotation shaft; wherein the second double-rotation piece is provided with a cross beam part for connecting to the leg support plate;

[0028] The second three-rotation piece is hingedly connected with the other end of the first double-rotation piece at one end thereof, and is hingedly connected with the second double-rotation piece at a middle position thereof;

[0029] The third double-rotation piece is hingedly connected with the other end of the second three-rotation piece at one end thereof, and is hingedly connected with the ratchet base through a fourth rotation shaft at the other end thereof;

[0030] The first connecting rod tension spring is connected with the leg support fixing piece at one end thereof, and is connected with the second double-rotation piece at the other end thereof, for driving the cross beam part to rotate downward around the third rotation shaft, so that the second three-rotation piece cooperates with the second rotation shaft to pull the first double-rotation piece from both ends;

[0031] The second connecting rod tension spring is connected with the cross beam part at one end thereof, and is connected with the third double-rotation piece close to the one end of the second three-rotation piece at the other end thereof, for driving the mutually hingedly connected ends of the third double-rotation piece and the second three-rotation piece to rotate towards the cross beam part, so that the leg support plate rotates outward relative to the leg support fixing piece to the extended state.

[0032] Optionally, the cross beam part and the leg support plate are rotationally connected through a hinge assembly.

[0033] Optionally, the fourth rotation shaft is fixedly arranged on the third double-rotation piece.

[0034] The fourth rotation shaft penetrates through the rotating gear and is rotationally connected with the fourth rotation shaft synchronously.

[0035] Optionally, the leg support fixing piece is provided with a thrust face for providing support to the second double-rotation piece, so as to limit the cross beam part from continuously rotating downward.

[0036] Optionally, the second double-rotation piece is provided with a resistance-reducing roller corresponding to the position of the thrust face, for abutting against the thrust face.

[0037] The ratchet type leg support has the following working process:

[0038] (1) Storage state:

[0039] In the initial state, the leg support plate is in the storage position, that is, close to the leg support fixed part.

[0040] At this time, the hand-driven ratchet assembly plays a limiting role on the leg support plate, so that it remains stable and does not move at will.

[0041] (2) Release the limit:

[0042] When the user needs to use the leg support, the hand-driven ratchet assembly is manually operated to release its limiting effect on the leg support plate.

[0043] (3) Extension process:

[0044] Once the limiting effect is released, the elastic tension of the tension spring connecting rod assembly begins to play a role.

[0045] Under the action of the elastic tension, the leg support plate gradually rotates away from the leg support fixed part until it reaches the predetermined extension position.

[0046] (4) Use state:

[0047] After the leg support plate is fully extended, it provides stable support for the user's legs and / or feet.

[0048] (5) Retracting process:

[0049] When the user needs to retract the leg support, press the leg support plate to rotate towards the leg support fixed part to the position close to the leg support fixed part, so that the leg support plate returns to the storage state, at this time, the hand-driven ratchet assembly acts again to limit the leg support plate, ensuring that the leg support is stable and does not move.

[0050] Therefore, the ratchet type leg support provided by the utility model realizes convenient extension and storage of the leg support plate without the need for electric equipment through the mechanical design of the hand-driven ratchet assembly cooperating with the tension spring connecting rod assembly, not only reduces the cost, but also improves the reliability and user experience. At the same time, due to its simple structure, maintenance is also more convenient, reducing the user's use annoyance. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0052] Figure 1 Structure schematic view of the ratchet type leg rest in the extended state provided by the embodiment;

[0053] Figure 2 Structure schematic view of the ratchet type leg rest in the extended state provided by the embodiment; Figure 1

[0054] Figure 3 Structure schematic view of the ratchet type leg rest in the extended state provided by the embodiment;

[0055] Figure 4 Structure schematic view of the ratchet type leg rest in the extended state provided by the embodiment; Figure 3

[0056] Figure 5 Structure schematic view of the ratchet type leg rest in the extended state provided by the embodiment.

[0057] In the drawings:

[0058] 1, leg rest fixing part; 101, thrust surface;

[0059] 2, leg supporting plate;

[0060] 3, hand drive ratchet assembly; 301, ratchet base; 302, rotating gear; 303, limit ratchet plate; 3031, arc-shaped limit slot; 304, ratchet plate tension spring; 305, unlocking rotating lever; 3051, rotating cap; 3052, rotating lever body; 3053, unlocking boss;

[0061] 4, tension spring connecting rod assembly; 401, first three-turn part; 402, first double-turn part; 403, second double-turn part; 4031, crossbeam part; 404, second three-turn part; 405, third double-turn part; 406, first connecting rod tension spring; 407, second connecting rod tension spring; 408, first rotating shaft; 409, second rotating shaft; 410, third rotating shaft; 411, fourth rotating shaft; 412, hinge assembly; 413, resistance-reducing roller. DETAILED DESCRIPTION

[0062] In the present application, the term “embodiment” mentioned in the present application means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The term “embodiment” appearing in various positions in the specification does not necessarily refer to the same embodiment, and does not particularly limit the independence or association between other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, each technical feature mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0063] ​​Unless otherwise defined, the meanings of technical terms used herein are the same as commonly understood by one of ordinary skill in the art to which the present application belongs; the use of related terms in the present description is merely to describe specific embodiments and is not intended to limit the present application.

[0064] In the description of the present application, the phrase "and / or" is a description of a logical relationship between objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" logical relationship.

[0065] In the present application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary and secondary or order relationship between the entities or operations.

[0066] Without more limitations, in the present application, "including", "containing", "having" or other similar expressions used in the sentence are intended to cover non-exclusive inclusion, and these expressions do not exclude the presence of other elements in the process, method or product including the elements, so that the process, method or product including a series of elements can not only include those limited elements, but also include other elements not explicitly listed, or also include the elements inherent to such process, method or product.

[0067] As the same as the understanding in the "Guidelines for Examination", in the present application, the expressions such as "greater than", "less than", "exceed" are understood as not including the number; the expressions such as "above", "below", "within" are understood as including the number. In addition, in the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times" and the like, unless otherwise explicitly limited.

[0068] In the description of the embodiments of the present application, the space-related expressions used, such as "center", "vertical", "horizontal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. The indicated orientation or position relationship is based on the orientation or position relationship shown in the specific embodiment or the drawing, and is only for the convenience of describing the specific embodiments of the present application or for the reader to understand, and is not intended to indicate or imply that the indicated device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, Therefore, it cannot be understood as a limitation on the embodiments of the present application.

[0069] Unless otherwise clearly indicated or limited, the terms "mounting", "connected", "connection", "fixed", "setting" and the like used in the description of the embodiments of the present application should be interpreted in a broad sense. For example, the "connection" can be fixed connection, or detachable connection, or integrated setting; it can be mechanical connection, or electrical connection, or communication connection; it can be direct connection, or indirect connection through intermediate medium; it can be internal communication of two elements, or interaction relationship between two elements. For those skilled in the art to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0070] Referring to Figures 1-5 The utility model provides a ratchet type leg support, including leg support fixing piece 1, leg support plate 2, hand drive ratchet assembly 3, tension spring connecting rod assembly 4.

[0071] Leg support fixing piece 1 is used for connecting with seat body, and leg support plate 2 is used for supporting the leg and foot of human body.

[0072] Hand drive ratchet assembly 3 is installed on leg support plate 2, and one end of tension spring connecting rod assembly 4 is hinged with leg support fixing piece 1, and the other end is connected with leg support plate 2 through hand drive ratchet assembly 3.

[0073] Among them, leg support plate 2 has the storage state that is kept in the position close to leg support fixing piece 1 under the limiting action of hand drive ratchet assembly 3, and has the extended state that rotates in the direction away from leg support fixing piece 1 under the elastic tension of tension spring connecting rod assembly 4 after the limiting action of hand drive ratchet assembly 3 is removed.

[0074] The ratchet type leg support provided by the embodiment has the following working process:

[0075] (1) Storage state:

[0076] In the initial state, leg support plate 2 is in the storage position, that is, the position close to leg support fixing piece 1.

[0077] At this time, hand drive ratchet assembly 3 plays a limiting role on leg support plate 2, so that it remains stable and does not move randomly.

[0078] (2) Remove the limiting:

[0079] When the user needs to use the leg support, hand drive ratchet assembly 3 is manually operated to remove its limiting action on leg support plate 2.

[0080] (3) Extension process:

[0081] Once the limiting action is removed, the elastic tension of the tension spring linkage assembly 4 begins to play.

[0082] Under the action of the elastic tension, the leg supporting plate 2 gradually rotates away from the leg supporting fixture 1 until it reaches the predetermined extended position.

[0083] (4) Use state:

[0084] After the leg supporting plate 2 is fully extended, it provides stable support for the user's legs and / or feet.

[0085] (5) Retracting process:

[0086] When the user needs to retract the leg support, press the leg supporting plate 2, so that the leg supporting plate 2 rotates towards the leg supporting fixture 1 to return to the position close to the leg supporting fixture 1, so that the leg supporting plate 2 returns to the storage state, at this time, the hand-driven ratchet assembly 3 acts again, limiting the leg supporting plate 2, ensuring that the leg support is stable.

[0087] Therefore, the ratchet type leg support provided by the utility model realizes the convenient extension and storage of the leg supporting plate 2 without the need for electric equipment through the mechanical design of the hand-driven ratchet assembly 3 and the tension spring linkage assembly 4, not only reduces the cost, but also improves the reliability and user experience. At the same time, due to its simple structure, maintenance is more convenient, reducing the user's use annoyance.

[0088] In this embodiment, the hand-driven ratchet assembly 3 includes a ratchet base 301, a rotating gear 302, a limiting ratchet plate 303, a ratchet plate tension spring 304, and an unlocking rotating rod 305.

[0089] The ratchet base 301 is fixedly arranged at the bottom of the leg supporting plate 2; the rotating gear 302 is rotatably arranged at the middle of the ratchet base 301; the limiting ratchet plate 303 is located at the side of the rotating gear 302, and one end of the limiting ratchet plate 303 away from the rotating gear 302 is rotatably connected with the ratchet base 301.

[0090] The two ends of the ratchet plate tension spring 304 are respectively connected with the middle of the limiting ratchet plate 303 and the bottom of the leg supporting plate 2, for driving the other end of the limiting ratchet plate 303 to rotate towards the rotating gear 302 and be clamped into the gear teeth of the rotating gear 302, so as to limit the forward rotation of the rotating gear 302.

[0091] The unlocking rotating rod 305 is rotatably connected with the ratchet base 301, for driving the other end of the limiting ratchet plate 303 to rotate away from the rotating gear 302 after being driven, and to be separated from the gear teeth of the rotating gear 302, so as to remove the rotation limitation of the rotating gear 302.

[0092] The unlocking rotating rod 305 comprises a rotating cap 3051, a rotating rod body 3052, and an unlocking boss 3053.

[0093] The rotating cap 3051 is located outside the leg supporting plate 2; one end of the rotating rod body 3052 is rotationally connected with the ratchet base 301 and extends to a side of the limiting ratchet plate 303 close to the bottom surface of the leg supporting plate 2; the other end of the rotating rod body 3052 extends to be fixedly connected with the rotating cap 3051;

[0094] The unlocking boss 3053 is located on the rotating rod body 3052 corresponding to the position of the limiting ratchet plate 303, and is used to be driven by the rotating cap 3051 to rotate with the rotating rod body 3052 to abut against the limiting ratchet plate 303, so that the other end of the limiting ratchet plate 303 rotates away from the rotating gear 302 and is disengaged from the gear teeth of the rotating gear 302.

[0095] It can be understood that when the rotating cap 3051 is forwardly screwed to make the unlocking boss 3053 abut against the limiting ratchet plate 303, the unlocking boss 3053 can overcome the tension of the ratchet spring 304, so that the other end of the limiting ratchet plate 303 rotates away from the rotating gear 302 and is disengaged from the gear teeth of the rotating gear 302, thereby completing the ratchet unlocking. At this time, under the elastic tension of the spring connecting rod assembly 4, the leg supporting plate 2 automatically rotates to the extended state away from the leg supporting fixed part 1. During the outward rotation of the leg supporting plate 2, if the rotating cap 3051 is reversely screwed by 90°, so that the unlocking boss 3053 is disengaged from the limiting ratchet plate 303, the tension of the ratchet spring 304 will make the other end of the limiting ratchet plate 303 re-engage the rotating gear 302 and complete the limiting of the rotating gear 302, thereby making the leg supporting plate 2 keep the current angle unchanged.

[0096] Optionally, the limiting ratchet plate 303 is provided with an arc-shaped limiting groove 3031 corresponding to the position of the unlocking boss 3053 for the unlocking boss 3053 to engage in.

[0097] In this embodiment, the spring connecting rod assembly 4 comprises a first three-rotation part 401, a first double-rotation part 402, a second double-rotation part 403, a second three-rotation part 404, a third double-rotation part 405, a first connecting rod spring 406, and a second connecting rod spring 407.

[0098] The first three-rotation part 401 is provided with a first rotation shaft 408, a second rotation shaft 409, and a third rotation shaft 410 arranged in a triangle; wherein the leg supporting fixed part 1 is hingedly connected with the first three-rotation part 401 through the first rotation shaft 408;

[0099] One end of the first double rotating part 402 is hinged with the first three rotating part 401 through the second rotating shaft 409;

[0100] The second double rotating part 403 is hinged with the first three rotating part 401 through the third rotating shaft 410; wherein the second double rotating part 403 is provided with a crossbeam part 4031 for connecting to the leg supporting plate 2; further, the crossbeam part 4031 and the leg supporting plate 2 are rotationally connected through a hinge assembly 412;

[0101] One end of the second three rotating part 404 is hinged with the other end of the first double rotating part 402, and the middle part of the second three rotating part 404 is hinged with the second double rotating part 403;

[0102] One end of the third double rotating part 405 is hinged with the other end of the second three rotating part 404, and the other end is hinged with the ratchet base 301 through the fourth rotating shaft 411; further, the fourth rotating shaft 411 is fixedly arranged on the third double rotating part 405; the fourth rotating shaft 411 passes through the rotating gear 302 and is rotationally connected with the fourth rotating shaft 411 in synchronization;

[0103] One end of the first connecting rod tension spring 406 is connected with the leg supporting fixture 1, and the other end is connected with the second double rotating part 403, for driving the crossbeam part 4031 to rotate downward around the third rotating shaft 410, so that the second three rotating part 404 cooperates with the second rotating shaft 409 to pull the first double rotating part 402 from both ends;

[0104] One end of the second connecting rod tension spring 407 is connected with the crossbeam part 4031, and the other end is connected with the third double rotating part 405 close to one end of the second three rotating part 404, for driving the mutually hinged ends of the third double rotating part 405 and the second three rotating part 404 to rotate towards the crossbeam part 4031, so that the leg supporting plate 2 rotates outward relative to the leg supporting fixture 1 to the extended state.

[0105] Specifically, when the third double rotating part 405 rotates, the rotating gear 302 is also driven to rotate forward through the fourth rotating shaft 411, therefore, when the ratchet plate tension spring 304 drives the other end of the limiting ratchet plate 303 to rotate towards the rotating gear 302 and is clamped into the gear teeth of the rotating gear 302, to limit the rotating gear 302 to rotate forward, it is equivalent to limiting the rotation between the third double rotating part 405 and the ratchet base 301, and further makes the leg supporting plate 2 maintain at the current angle.

[0106] When the unlocking handle 305 is twisted to make the limiting ratchet plate 303 disengage from the rotating gear 302, under the pulling force of the second connecting rod spring 407, the mutual hinged ends of the third double rotating piece 405 and the second three rotating piece 404 are turned towards the beam part 4031, so that the leg supporting plate 2 continues to turn outwards relative to the leg supporting fixture 1.

[0107] Optionally, the leg supporting fixture 1 is provided with a thrust surface 101 for providing support to the second double rotating piece 403 to limit the beam part 4031 from continuing to turn downwards. Correspondingly, the second double rotating piece 403 is provided with a resistance reducing roller 413 for abutting against the thrust surface 101 at a position corresponding to the thrust surface 101.

[0108] The ratchet type leg supporting device provided by the embodiment has the following detailed working process:

[0109] (1) Initial state (storage state):

[0110] The leg supporting plate 2 is in the storage position and close to the leg supporting fixture 1.

[0111] The limiting ratchet plate 303 of the hand driven ratchet assembly 3 is clamped into the gear teeth of the rotating gear 302, which limits the leg supporting plate 2 and keeps it stable.

[0112] Step 1: Release the limiting action

[0113] The user manually operates the hand driven ratchet assembly 3, specifically by rotating the rotating cap 3051 to drive the unlocking handle 305 to rotate.

[0114] The unlocking boss 3053 on the unlocking handle 305 abuts against the limiting ratchet plate 303, overcomes the pulling force of the ratchet spring 304, and makes the limiting ratchet plate 303 turn upwards and disengage from the gear teeth of the rotating gear 302, thereby releasing the limiting action on the leg supporting plate 2.

[0115] Step 2: The leg supporting plate 2 starts to extend

[0116] Once the limiting action is released, the first connecting rod spring 406 and the second connecting rod spring 407 of the spring connecting rod assembly 4 start to work.

[0117] The first connecting rod spring 406 drives the beam part 4031 (connected to the second double rotating piece 403) to turn downwards, while the second connecting rod spring 407 drives the leg supporting plate 2 to turn outwards.

[0118] Step 3: The leg supporting plate 2 is completely extended

[0119] Under the elastic pulling force of the spring connecting rod assembly 4, the leg supporting plate 2 gradually turns away from the leg supporting fixture 1 until it reaches the predetermined extended position (extended state).

[0120] At this time, the limiting pawl 303 of the hand-driven ratchet assembly 3 is again clamped into the gear teeth of the rotating gear 302 under the action of the pawl tension spring 304, limiting the further movement of the leg supporting plate 2 and keeping stable.

[0121] (II) Use state:

[0122] The leg supporting plate 2 is fully extended, providing stable support for the user's legs and / or feet.

[0123] Step 4: Retracting the leg supporting plate 2

[0124] The user applies pressure to the leg supporting plate 2, causing it to rotate towards the leg support fixture 1.

[0125] When retracting the leg supporting plate 2, whether the hand-driven ratchet assembly 3 is unlocked or not, pushing the leg supporting plate 2 inward will cause it to return to the storage position. This is because during the retraction process, the ratchet limiting plate only limits forward rotation and does not interfere with reverse rotation.

[0126] Step 5: The leg supporting plate 2 returns to the storage position

[0127] Under the action of the user's applied pressure, the leg supporting plate 2 continues to rotate towards the leg support fixture 1 until it returns to the storage position.

[0128] The limiting pawl 303 of the hand-driven ratchet assembly 3 is again clamped into the gear teeth of the rotating gear 302, limiting the movement of the leg supporting plate 2 and returning to the initial storage state.

[0129] Additional notes:

[0130] During the entire working process, the thrust surface 101 on the leg support fixture 1 provides support, limiting the continued downward rotation of the crossbeam part 4031.

[0131] The resistance-reducing roller 413 on the second double-rotating part 403 is in contact with the thrust surface 101, reducing frictional resistance and making the extension and retraction process of the leg supporting plate 2 more smooth.

[0132] Through the above orderly steps, the ratchet type leg support realizes the convenient extension and storage of the leg supporting plate 2 without the need for electric equipment, providing users with a comfortable and convenient use experience.

[0133] In summary, the ratchet type leg support provided in this embodiment has the following advantages:

[0134] ① Convenient operation: By manually operating the hand-driven ratchet assembly 3, the user can easily release the limiting, causing the leg supporting plate 2 to automatically extend under the elastic tension of the tension spring linkage assembly 4, without the need for complex steps or electric equipment assistance.

[0135] ② Stable support: In the fully extended state, the limit ratchet plate 303 of the hand-driven ratchet assembly 3 is again clamped into the gear teeth of the rotating gear 302, ensuring that the leg support plate 2 is stable and providing reliable support for the user's legs and / or feet.

[0136] ③ Simple storage: The user only needs to press the leg support plate 2 towards the leg support fixture 1, which can be quickly stored, and whether the hand-driven ratchet assembly 3 is in the unlocked state, it can be easily completed.

[0137] ④ Mechanical efficiency: The use of ratchet, tension spring and connecting rod mechanical structure realizes the extension and storage of the leg support plate 2, avoids the complexity and potential failure of electric equipment, and improves the overall efficiency.

[0138] ⑤ Reduce friction: The design of the thrust surface 101 on the leg support fixture 1 and the friction-reducing roller 413 on the second double-turning piece 403 effectively reduces the frictional resistance of the leg support plate 2 during extension and retraction, making the operation more smooth.

[0139] Finally, it needs to be pointed out that although the above-mentioned embodiments have been described in the specification and drawings of the present application, it cannot limit the patent protection scope of the present application. Any equivalent structure or equivalent flow replacement or modification of the technical solutions based on the essential concept of the present application, using the contents described in the specification and drawings, and directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, etc. are all included in the patent protection scope of the present application.

Claims

1. A ratchet style leg rest characterized by, The utility model relates to a leg rest fixing part (1) for connecting with seat body, a leg rest plate (2) for supporting the leg and foot of human body, a hand drive ratchet wheel assembly (3) installed on the leg rest plate (2), a tension spring connecting rod assembly (4) one end of which is hinged with the leg rest fixing part (1) and the other end of which is connected with the leg rest plate (2) through the hand drive ratchet wheel assembly (3), wherein the leg rest plate (2) has a storage state kept in the position close to the leg rest fixing part (1) under the limiting action of the hand drive ratchet wheel assembly (3) and an extension state rotated in the direction away from the leg rest fixing part (1) under the elastic tension of the tension spring connecting rod assembly (4) after the limiting action of the hand drive ratchet wheel assembly (3) is released. The hand drive ratchet wheel assembly (3) comprises a ratchet wheel base (301) fixed to the bottom of the leg rest plate (2), a rotating gear (302) rotatably installed in the middle of the ratchet wheel base (301), a limiting ratchet plate (303) located at the side of the rotating gear (302) and rotatably connected with the ratchet wheel base (301) at one end away from the rotating gear (302), a ratchet plate tension spring (304) having two ends respectively connected with the middle of the limiting ratchet plate (303) and the bottom of the leg rest plate (2) for driving the other end of the limiting ratchet plate (303) to rotate towards the rotating gear (302) and be clamped into the gear teeth of the rotating gear (302) to limit the forward rotation of the rotating gear (302), and an unlocking rotating lever (305) rotatably connected with the ratchet wheel base (301) for driving the other end of the limiting ratchet plate (303) to rotate away from the rotating gear (302) and be separated from the gear teeth of the rotating gear (302) to release the rotation limitation of the rotating gear (302) after being driven. The unlocking rotating lever (305) comprises a rotating cap (3051) located outside the leg rest plate (2), a rotating lever body (3052) one end of which is rotatably connected with the ratchet wheel base (301) and extends to the side of the limiting ratchet plate (303) close to the bottom surface of the leg rest plate (2), and the other end of which extends to be fixedly connected with the rotating cap (3051). ​ ​ ​ 2. The ratchet style leg rest of claim 1, wherein, ​ ​ ​ ​ ​ ​ 3. A ratchet style leg rest according to claim 2, wherein, ​ ​ ​ An unlocking boss (3053) is arranged on the rotating rod body (3052) at a position corresponding to the limiting ratchet plate (303), and is driven by the rotating cap (3051) to rotate with the rotating rod body (3052) to abut against the limiting ratchet plate (303), so that the other end of the limiting ratchet plate (303) is away from the rotating gear (302) and is disengaged from the gear teeth of the rotating gear (302).

4. A ratchet leg rest according to claim 3, wherein, The limiting ratchet plate (303) is provided with an arc-shaped limiting groove (3031) corresponding to the position of the unlocking boss (3053) for clamping the unlocking boss (3053).

5. The ratchet style leg rest of claim 2, wherein, The pull spring linkage assembly (4) comprises: A first three-rotation member (401) is provided with a first rotation shaft (408), a second rotation shaft (409) and a third rotation shaft (410) arranged in a triangle; wherein the leg support fixing member (1) is hinged to the first three-rotation member (401) through the first rotation shaft (408); A first double-rotation member (402) is hinged to the first three-rotation member (401) at one end through the second rotation shaft (409); A second double-rotation member (403) is hinged to the first three-rotation member (401) through the third rotation shaft (410); wherein the second double-rotation member (403) is provided with a cross beam portion (4031) for connecting to the leg support plate (2); A second three-rotation member (404) is hinged at one end to the other end of the first double-rotation member (402) and is hinged at a middle position to the second double-rotation member (403); A third double-rotation member (405) is hinged at one end to the other end of the second three-rotation member (404) and is hinged at the other end to the ratchet wheel base (301) through a fourth rotation shaft (411); A first linkage pull spring (406) is connected at one end to the leg support fixing member (1) and at the other end to the second double-rotation member (403), for driving the cross beam portion (4031) to rotate downward around the third rotation shaft (410) so that the second three-rotation member (404) tightens the first double-rotation member (402) from both ends in cooperation with the second rotation shaft (409); A second linkage pull spring (407) is connected at one end to the cross beam portion (4031) and at the other end to the third double-rotation member (405) near the end of the second three-rotation member (404), for driving the mutually hinged ends of the third double-rotation member (405) and the second three-rotation member (404) to rotate towards the cross beam portion (4031), so that the leg support plate (2) rotates outward relative to the leg support fixing member (1) to the extended state.

6. A ratchet style leg rest according to claim 5, wherein, The cross beam portion (4031) and the leg support plate (2) are connected by a hinge assembly (412).

7. The ratchet style leg rest of claim 5, wherein, The fourth rotating shaft (411) is fixed to the third double rotating part (405); The fourth rotating shaft (411) penetrates through the rotating gear (302) and is synchronously connected with the fourth rotating shaft (411) in rotation.

8. The ratchet style leg rest of claim 5, wherein, The leg support fixing part (1) is provided with a thrust surface (101) for providing support to the second double rotating part (403) to limit the horizontal beam part (4031) from continuing to rotate downward.

9. A ratchet style leg rest according to claim 8, wherein, The second double rotating part (403) is provided with a resistance-reducing roller (413) corresponding to the position of the thrust surface (101) for abutting against the thrust surface (101).

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