Hidden sofa pedal device and sofa

Abstract

The invention discloses a hidden sofa pedal device and a sofa. The device comprises a sliding rail assembly and a movable pedal mechanism. The slide rail assembly is fixed at the bottom of the sofa; the movable pedal mechanism is composed of a sliding part, a connecting rod assembly, an air pressure lifting assembly and a pedal assembly. The sliding part is slidably connected with the sliding rail assembly. The two ends of the connecting rod assembly are rotationally connected with the sliding piece and the pedal assembly correspondingly. The two ends of the pneumatic lifting assembly are rotationally connected with the sliding piece and the connecting rod assembly correspondingly, and the connecting rod assembly is pneumatically driven to rotate to lift the pedal assembly. When the pedal assembly is pulled out from the bottom of the sofa to the initial position, the driving torque generated by the air pressure lifting assembly is smaller than or equal to the resistance torque generated by the pedal assembly and the connecting rod assembly together, so that the pedal cannot be automatically lifted after being pulled out, a user needs to actively apply force to trigger the lifting action, the problem of false triggering of a traditional pedal is solved, and the safety of the sofa is improved. And the safety and the user experience are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of furniture, in particular to a hidden sofa footrest device and a sofa. Background Art

[0002] In existing sofa designs, the footrest is often hidden at the bottom to save space. When the user unfolds the sofa by pulling it out, it automatically and quickly springs up due to a lifting mechanism such as an internal spring. This process lacks a buffering control mechanism, so the footrest can easily rise suddenly and strike the user's legs or feet, posing a safety hazard, especially for children or those with limited mobility. Furthermore, the sudden mechanical movement can cause psychological stress for the user, reducing comfort. Summary of the Invention

[0003] The embodiments of the present invention provide a hidden sofa footrest device and a sofa, aiming to solve the problem that the footrest of the existing sofa is easily pulled out from the bottom of the sofa and easily hits the user due to sudden lifting, causing a safety hazard.

[0004] In a first aspect, the present invention provides a hidden sofa footrest device, comprising:

[0005] The slide rail assembly is fixedly installed on the bottom of the sofa;

[0006] The movable pedal mechanism includes a sliding member, a connecting rod assembly, a pneumatic lifting assembly, and a pedal assembly. The sliding member is slidably connected to the slide rail assembly. The first end of the connecting rod assembly is rotatably connected to the sliding member, and the second end is rotatably connected to the pedal assembly. The non-driving end of the pneumatic lifting assembly is rotatably connected to the sliding member, and the driving end is rotatably connected to the connecting rod assembly, so as to drive the connecting rod assembly to rotate under the action of air pressure to lift the pedal assembly.

[0007] When the footrest assembly is pulled out from the bottom of the sofa to the initial position, the driving torque generated by the air pressure lifting assembly is less than or equal to the resistance torque generated by the footrest assembly and the connecting rod assembly.

[0008] Furthermore, the first end of the connecting rod assembly is provided with a rotation point a1, and the second end is provided with a rotation point a2, and the connecting rod assembly rotates around a1; the non-driving end of the pneumatic lifting assembly is provided with a rotation point b1, and the driving end is provided with a rotation point b2; wherein, a1 is adjacent to b1, and an angle is formed between the pneumatic lifting assembly and the vertical direction.

[0009] Furthermore, the connecting rod assembly includes a bent section, a straight section and an oblique section connected in sequence, the bent section bends downward from the sliding member, the straight section extends from the bent section in a direction away from the sliding member, and the oblique section is inclined upward from the straight section toward the pedal assembly; wherein, a1 is arranged at the bent section, a2 is arranged at the oblique section, and b2 is arranged at a position of the straight section close to one side of the bent section.

[0010] Furthermore, when the footrest assembly is pulled out from the bottom of the sofa to the initial position, the following conditions are satisfied:

[0011] F 弹 ×L 弹 ≤F 重力 ×L 重力 +f 摩擦力 ×L 摩擦力

[0012] Among them, F 弹 is the driving force of the air pressure lifting component, L 弹 is the lever arm of the air pressure lifting assembly, F 重力 is the weight of the pedal assembly and the connecting rod assembly, L 重力 is the gravity arm, f 摩擦力 is the rotational static friction of the connecting rod assembly, L 摩擦力 is the moment arm of the friction force of the connecting rod assembly.

[0013] Furthermore, when the footrest assembly is lifted from the initial position, the following conditions are satisfied:

[0014] F 弹 ×L 弹 +F 冲 >F 重力 ×L 重力 +f 摩擦力 ×L 摩擦力

[0015] Among them, F 弹 is the driving force of the air pressure lifting component, L 弹 is the lever arm of the air pressure lifting assembly, F 冲 is the impulse applied by the user to the pedal assembly, F 重力 is the weight of the pedal assembly and the connecting rod assembly, L 重力 is the gravity arm, f 摩擦力 is the rotational static friction of the connecting rod assembly, L 摩擦力 is the moment arm of the friction force of the connecting rod assembly.

[0016] Furthermore, when the footrest assembly is lifted to the end position, the following conditions are satisfied:

[0017] F 脚 +f 总摩擦力+G 脚踏 ≤F 弹 ×sinβ

[0018] Among them, F 脚 is the force applied by the user to the pedal assembly in the vertical direction, f 总摩擦力 is the friction force of the entire movable pedal mechanism, G 脚踏 is the weight of the pedal assembly, F 弹 is the driving force of the air pressure lifting assembly, and β is the angle formed between the air pressure lifting assembly and the vertical direction.

[0019] Furthermore, when the footrest assembly descends from the end position, the following conditions are satisfied:

[0020] F 脚 +f 总摩擦力 +G 脚踏 >F 弹 ×sinβ

[0021] Among them, F 脚 is the force applied by the user to the pedal assembly in the vertical direction, f 总摩擦力 is the friction force of the entire movable pedal mechanism, G 脚踏 is the weight of the pedal assembly, F 弹 is the driving force of the air pressure lifting assembly, and β is the angle formed between the air pressure lifting assembly and the vertical direction.

[0022] Furthermore, the slide rail assembly is provided with an elastic positioning member for positioning the pedal assembly to a hidden position. When the pedal assembly is pulled out from the hidden position, the following conditions are met:

[0023] F 拉 >f 静 +F 弹性定位件

[0024] Among them, F 拉 is the force applied by the user to the pedal assembly in the horizontal direction, f 静 is the static friction of the slide rail assembly, F 弹性定位件 is the elastic force of the elastic positioning member.

[0025] Furthermore, the slide rail assembly is provided with another elastic positioning member for positioning the pedal assembly to an initial position. When the pedal assembly is engaged with the other elastic positioning member, the following conditions are satisfied:

[0026] F 拉 >f 静 +F 弹性定位件

[0027] Among them, F 拉is the force applied by the user to the pedal assembly in the horizontal direction, f 静 is the static friction of the slide rail assembly, F 弹性定位件 is the elastic force of the elastic positioning member.

[0028] Furthermore, when the footrest assembly slides along the slide rail assembly, the following conditions are satisfied:

[0029] F 拉 >f 静 +Na

[0030] Among them, F 拉 is the force applied by the user to the pedal assembly in the horizontal direction, f 静 is the static friction force of the slide rail assembly, N is the normal pressure of the static friction contact surface of the slide rail assembly, which is a constant value, and a is the acceleration of the pedal assembly being pulled out.

[0031] Furthermore, the pneumatic lifting assembly includes a cylinder and a piston rod slidably connected to the cylinder, the cylinder is hinged to the sliding member, and one end of the piston rod away from the cylinder is hinged to the connecting rod assembly.

[0032] In a second aspect, the present invention further provides a sofa, comprising a seat frame and a hidden sofa footrest device, wherein the hidden sofa footrest device is the above-mentioned hidden sofa footrest device, and a slide rail assembly is fixedly installed on the bottom of the seat frame.

[0033] The present invention provides a hidden sofa footrest device and a sofa. In the hidden sofa footrest device, a slide rail assembly is fixed to the bottom of the sofa, providing a sliding track for a movable footrest mechanism. A sliding member is slidably connected to the slide rail assembly and can move along the track. A connecting rod assembly has a first end rotatably connected to the sliding member and a second end rotatably connected to the footrest assembly to form a linkage structure. A pneumatic lifting assembly has a non-driving end rotatably connected to the sliding member and a driving end rotatably connected to the connecting rod assembly. Under the action of pneumatic pressure, the connecting rod assembly can be driven to rotate by pneumatic pressure, thereby lifting the footrest assembly. When the footrest assembly is pulled out to an initial position, the driving torque of the pneumatic lifting assembly is no greater than the resistance torque generated by the footrest assembly and the connecting rod assembly, so that the footrest assembly will not automatically slide or lift due to excessive force, ensuring safe and stable use. The rotating and sliding connection design of each component realizes the function of concealing the footrest assembly for storage and conveniently deploying it, which saves space and is convenient to use. The pneumatic lifting assembly can provide stable assistance, reducing the user's operating force requirement, and improving the comfort and flexibility of the sofa footrest. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A schematic structural diagram of a hidden sofa footrest device according to an embodiment of the present invention is shown;

[0036] Figure 2 A side view schematic diagram showing a hidden sofa footrest device in an initial position according to an embodiment of the present invention is shown;

[0037] Figure 3 A side view schematic diagram showing a hidden sofa footrest device in an end position according to an embodiment of the present invention is shown;

[0038] Figure 4 Shown Figure 1 A magnified view of part A1;

[0039] Figure 5 Shown Figure 1 A2 enlarged view of the

[0040] Figure 6 Shown Figure 1 A3 enlarged view;

[0041] Figure 7 Shown Figure 1 A4 enlarged view;

[0042] Figure 8 Shown Figure 2 Enlarged view of part B1;

[0043] Figure 9 Shown Figure 2 Enlarged view of part B2;

[0044] Figure 10 Shown Figure 3 Enlarged view of C1 part;

[0045] Figure 11 Shown Figure 3 Magnified view of C2 part;

[0046] Figure 12a-12c A three-dimensional schematic diagram showing the hidden position, stowed / extended position, and deployed position of a hidden sofa footrest device according to an embodiment of the present invention;

[0047] Figure 13a-Figure 13c A three-dimensional schematic diagram showing the footrest hidden position, footrest retracted / extended position, and footrest deployed position of a sofa according to an embodiment of the present invention;

[0048] Reference numerals:

[0049] 1. Movable pedal mechanism; 11. Connecting rod assembly; 111. First connecting rod; 1111. Slide groove; 112. Second connecting rod; 1121. Second limiting structure; 113. Synchronous shaft; 11a. Bending section; 11b. Straight section; 11c. Oblique section; 12. Pneumatic lifting assembly; 121. Cylinder; 122. Piston rod; 13. Pedal assembly; 131. Support frame; 1311. First bayonet; 1312. Second bayonet; 1313. Triangular piece; 132. Foot pedal; 133. Elastic member; 14. Sliding member; 141. First sliding sleeve; 142. Second sliding sleeve; 143. Connecting piece; 144. First limiting structure; 145. Block; 2. Slide rail assembly; 21. First sliding optical axis; 22. Second sliding optical axis; 23. Arched spring piece; 24. Angle iron; 3. Seat frame. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0051] Directional terms used herein, such as "upper," "lower," "front," "back," "left," "right," "inner," "outer," and "side," refer only to directions in the accompanying drawings. Therefore, these directional terms are intended to illustrate and facilitate understanding of the present invention and are not intended to limit the present invention. Furthermore, in the accompanying drawings, similar or identical structures are denoted by the same reference numerals.

[0052] Existing hidden sofa footrests often rise instantly after being pulled out of the sofa due to an inappropriate design of the pneumatic lift assembly. This not only poses a safety hazard by striking the user's legs, but can also degrade the user experience due to accidental triggering. This issue stems from the traditional design's lack of precise control over the torque balance during the initial pull-out phase.

[0053] To this end, an embodiment of the present invention provides a hidden sofa footrest device and a sofa. By designing the driving torque of the air pressure lifting assembly to be no greater than the resistance torque generated by the footrest assembly and the connecting rod assembly, the footrest assembly will not automatically slide or lift due to excessive force, ensuring safe and stable use.

[0054] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0055] See also Figure 1-12c The embodiment of the present invention shows a hidden sofa footrest device, comprising: a slide rail assembly 2, fixedly installed on the bottom of the sofa; a movable footrest mechanism 1, comprising a sliding member 14, a connecting rod assembly 11, an air pressure lifting assembly 12 and a footrest assembly 13, wherein the sliding member 14 is slidably connected to the slide rail assembly 2; the first end of the connecting rod assembly 11 is rotatably connected to the sliding member 14, and the second end is rotatably connected to the footrest assembly 13; the non-driving end of the air pressure lifting assembly 12 is rotatably connected to the sliding member 14, and the driving end is rotatably connected to the connecting rod assembly 11, for driving the connecting rod assembly 11 to rotate under the action of air pressure to lift the footrest assembly 13; wherein, when the footrest assembly 13 is pulled out from the bottom of the sofa to the initial position, the driving torque generated by the air pressure lifting assembly 12 is less than or equal to the resistance torque generated by the footrest assembly 13 and the connecting rod assembly 11.

[0056] Specifically, the slide rail assembly 2 is fixedly mounted to the bottom of the sofa seat frame 3 along the front-to-back direction of the sofa. The movable footrest mechanism 1 primarily comprises a sliding member 14, a connecting rod assembly 11, a pneumatic lift assembly 12, and a footrest assembly 13. The sliding member 14 is slidably mounted on the slide rail assembly 2 to enable horizontal forward and backward telescopic movement. The connecting rod assembly 11 has a first end pivotally connected to the sliding member 14 and a second end pivotally connected to the footrest assembly 13, forming a foldable linkage mechanism. The pneumatic lift assembly 12 has two ends pivotally connected to the sliding member 14 and the connecting rod assembly 11, respectively. To deploy the footrest, the user manually pulls the footrest assembly 13 outward from the sofa bottom, causing the slider 14 to slide outward along the rail assembly 2. The pneumatic lift assembly 12, under the action of air pressure, rotates the connecting rod assembly 11, smoothly lifting the footrest assembly 13 from the sofa bottom to form a horizontal support surface. To retract the footrest, the pneumatic lift assembly 12 reverses, causing the footrest assembly 13 to fall back along with the connecting rod assembly 11 and slide back along the rail assembly 2 with the slider 14, completely concealing it beneath the sofa bottom. This device, through the coordinated cooperation of the rail assembly 2 and the movable footrest mechanism 1, enables smooth deployment and concealment of the footrest assembly 13, saving space while offering ease of operation and comfort. This effectively addresses the inconvenience of traditional footrests, which cannot be fully concealed. Furthermore, when the footrest assembly 13 is pulled out from the sofa bottom to its initial horizontal position, the precise mechanical relationship between the pneumatic lift assembly 12 and the connecting rod assembly 11 ensures a safe and prevents accidental lifting. Specifically, when the pedal assembly 13 is fully pulled out, the driving torque generated by the pneumatic lifting assembly 12 (acting on the connecting rod assembly 11) is designed not to exceed the resistance torque jointly generated by the pedal assembly 13 and the connecting rod assembly 11. At this time, the system is in a torque balance state, the pneumatic lifting assembly 12 cannot autonomously drive the connecting rod to rotate, and the pedal assembly 13 remains in a horizontal static state. Only when the user actively applies an upward lifting force (for example, 10-20N) does the external force break the equilibrium state, and the pneumatic lifting assembly 12 responds to the action to push the pedal assembly 13 to lift. This torque balance design fundamentally eliminates the risk of the pedal automatically bouncing up after being pulled out, avoiding the hidden dangers of accidental collisions while retaining the convenient operating feature of lifting with a light touch.

[0057] In this embodiment, the pedal mechanism is configured so that the driving torque generated by the pneumatic lift assembly 12 is less than or equal to the resistance torque generated by the pedal assembly 13 and the connecting rod assembly 11. This ensures that the pedal assembly 13 remains stable and stationary in its initial position, preventing it from suddenly rising due to the driving force of the pneumatic lift assembly 12, thus avoiding the risk of collision to the user. When the user further applies an upward auxiliary force to overcome the resistance torque, the pneumatic lift assembly 12 begins to function, driving the connecting rod assembly 11 to rotate and lift the pedal assembly 13 to the operating angle, achieving a safe and controllable operating experience.

[0058] Reference Figure 4 、 Figure 8 and Figure 10 In one embodiment, the pneumatic lift assembly 12 includes a cylinder 121 and a piston rod 122 slidably connected to the cylinder 121. The cylinder 121 is hinged to the sliding member 14, and the piston rod 122 is hinged to the connecting rod assembly 11 at one end away from the cylinder 121. Specifically, the pneumatic lift assembly 12 consists of the cylinder 121 and the piston rod 122. The cylinder 121 is connected to the inner side wall of the connecting piece 143 of the sliding member 14 via a hinge axis, and the end of the piston rod 122 is hinged to the connecting rod assembly 11. When the footrest assembly 13 slides out of the sofa via the sliding member 14, the pneumatic lift assembly 12 is in an initial compressed state. At this time, the user only needs to apply a slight upward force to the footrest 132 to trigger the pneumatic device to operate. The piston rod 122 is smoothly extended under the action of the internal air pressure, pushing the connecting rod assembly 11 to rotate, thereby driving the entire connecting rod assembly 11 to move, achieving automatic lifting of the footrest assembly 13. To fold it up, the user applies slight downward pressure on the footrest 132, causing the piston rod 122 to gently retract under the reverse air pressure, pulling the connecting rod assembly 11 in the opposite direction to fold and retract the footrest assembly 13. Finally, the entire device is pushed into the bottom of the sofa via the sliding member 14, completely concealing it. This design combines the cushioning properties of the air pressure device with the user's slight starting force to achieve both convenient and safe operation, while ensuring a smooth and seamless footrest raising and lowering process. It also avoids the safety hazards caused by sudden raising and lowering, and offers excellent controllability, allowing the entire device to not only have automatic raising and lowering functions but also precisely control the movement timing according to user needs, greatly enhancing the user experience.

[0059] Reference Figure 8In one embodiment, the connecting rod assembly 11 has a first end with a pivot point a1 and a second end with a pivot point a2, and the connecting rod assembly 11 rotates around a1; the pneumatic lift assembly 12 has a pivot point b1 at its non-driven end and a pivot point b2 at its driven end; wherein a1 is adjacent to b1, and the pneumatic lift assembly 12 forms an angle with the vertical direction. Specifically, in this embodiment, the connecting rod assembly 11 and the pneumatic lift assembly 12 are optimized by setting specific pivot points and angle relationships. Specifically, the first end of the connecting rod assembly 11 (the end connected to the sliding member 14) has a pivot point a1, and the second end (the end connected to the pedal assembly 13) has a pivot point a2, and the connecting rod assembly 11 can freely rotate around a1; the non-driven end of the pneumatic lift assembly 12 (the end connected to the sliding member 14) has a pivot point b1, and the driven end (the end connected to the connecting rod assembly 11) has a pivot point b2. During installation, a1 and b1 are designed to be adjacent to each other, so that the air pressure lifting assembly 12 and the connecting rod assembly 11 form a compact linkage structure in space. At the same time, the air pressure lifting assembly 12 as a whole forms a certain angle with the vertical direction. The setting of this angle enables the air pressure lifting assembly 12 to effectively convert the linear thrust generated by the air pressure into a rotational torque around point a1 when driving the connecting rod assembly 11. When the footrest assembly 13 is pulled out from the bottom of the sofa to the initial position, the driving force direction of the air pressure lifting assembly 12 forms a specific angle with the lever arm of the connecting rod assembly 11 due to the angle relationship with the vertical direction, thereby generating a driving torque. By accurately designing the adjacent distances between the rotation points a1 and b1 and the tilt angle of the air pressure lifting assembly 12, when the device is in the initial position, the driving torque of the air pressure lifting assembly 12 can be precisely matched with the resistance torque of the footrest assembly 13 and the connecting rod assembly 11, ensuring that the footrest assembly 13 stays stably.

[0060] In this embodiment, the connecting rod assembly 11 includes a bent section 11a, a straight section 11b, and an oblique section 11c, which are sequentially connected. The bent section 11a bends downward from the sliding member 14, the straight section 11b extends from the bent section 11a away from the sliding member 14, and the oblique section 11c tilts upward from the straight section 11b toward the footrest assembly 13. In particular, a1 is located on the bent section 11a, a2 is located on the oblique section 11c, and b2 is located on the side of the straight section 11b near the bent section 11a. Specifically, the rod assembly adopts a three-section structural design. Through the coordinated action of the bent section 11a, the straight section 11b, and the oblique section 11c, the force transmission path and torque balance relationship are optimized. Specifically, the bent section 11a of the connecting rod assembly 11 bends downward from the sliding member 14 to form a downwardly extending structure, and its rotational connection with the sliding member 14 (rotation point a1) is located at the starting end of the bent section 11a. The straight section 11b extends horizontally from the bent section 11a in a direction away from the sliding member 14, and its length is determined according to the space at the bottom of the sofa and the stroke of the footrest assembly 13. The oblique section 11c tilts upward from the end of the straight section 11b toward the footrest assembly 13, and its rotational connection with the footrest assembly 13 (rotation point a2) is located at the end of the oblique section 11c. The driving end (rotation point b2) of the air pressure lifting assembly 12 is connected to the straight section 11b at a position close to the side of the bent section 11a. When the footrest assembly 13 is in the storage state, the three-section structure of the connecting rod assembly 11 fits compactly to the bottom of the sofa, and the downward design of the bent section 11a avoids interference with the sofa frame. When the pedal assembly 13 is pulled out to its initial position, the pneumatic lift assembly 12 applies a driving force to the straight segment 11b through the rotation point b2. Because b2 is close to the bent segment 11a, and the straight segment 11b forms an upward inclination angle with the diagonal segment 11c, the driving force of the pneumatic lift assembly 12 is decomposed into horizontal and vertical components. The horizontal component generates a rotational torque around the rotation point a1 through the bent segment 11a, while the vertical component assists in lifting the diagonal segment 11c and the connected pedal assembly 13. This structural design allows the driving force of the pneumatic lift assembly 12 to be more effectively converted into a lifting torque. At the same time, through the geometric relationship between the bent segment 11a, the straight segment 11b, and the diagonal segment 11c, the balance between the resistance torque and the driving torque of the pedal assembly 13 in the initial position is precisely controlled. By optimizing the length and angle parameters of the three segments (such as the length of the straight segment 11b and the inclination angle of the diagonal segment 11c), it can be ensured that the resistance torque is slightly greater than or equal to the driving torque in the initial position, achieving stable retention of the pedal assembly 13. In addition, the three-section structure also enhances the structural strength of the connecting rod assembly 11, reduces stress deformation, and extends the service life of the device.

[0061] In one embodiment, when the footrest assembly is pulled out from the bottom of the sofa to the initial position, the following conditions are satisfied:

[0062] F 弹×L 弹 ≤F 重力 ×L 重力 +f 摩擦力 ×L 摩擦力

[0063] Among them, F 弹 is the driving force of the air pressure lifting component, L 弹 is the lever arm of the air pressure lifting assembly, F 重力 is the weight of the pedal assembly and the connecting rod assembly, L 重力 is the gravity arm, f 摩擦力 is the rotational static friction of the connecting rod assembly, L 摩擦力 is the moment arm of the friction force of the connecting rod assembly.

[0064] Specifically, when the footrest assembly 13 is pulled out from the bottom of the sofa to the initial horizontal position, the system needs to satisfy the torque balance relationship of Fspring×Lspring≤Fgravity×Lgravity+ffriction×Lfriction. In the initial position, the balance relationship can be simplified to Fspring×sinα≤Fgravity+ffriction (where α is the angle between the pneumatic lifting assembly 12 and the vertical direction), where the driving force Fspring of the pneumatic lifting assembly 12 acts on the connecting rod assembly 11 through the rotation point b2 to form a driving torque, which is balanced by the gravity torque (Fgravity×Lgravity) of the footrest assembly 13 and the connecting rod assembly 11 and the static friction torque (ffriction×Lfriction) at the rotating pair of the connecting rod assembly 11. By rationally designing the installation angle, connecting rod configuration and rotation point position of the pneumatic lifting assembly 12, the driving torque is always no greater than the resistance torque in the initial position, ensuring that the pedal assembly 13 will not automatically lift. The various parameters in the balance condition can be determined through experimental measurement or theoretical calculation. During specific implementation, the corresponding parameter values ​​need to be adjusted according to the actual structural dimensions and material properties to meet the requirements of the anti-accidental lifting function.

[0065] In one embodiment, when the footrest assembly is lifted from the initial position, the following conditions are satisfied:

[0066] F 弹 ×L 弹 +F 冲 >F 重力 ×L 重力 +f 摩擦力 ×L 摩擦力

[0067] Among them, F 弹 is the driving force of the air pressure lifting component, L 弹 is the lever arm of the air pressure lifting assembly, F 冲 is the impulse applied by the user to the pedal assembly, F 重力 is the weight of the pedal assembly and the connecting rod assembly, L 重力 is the gravity arm, f 摩擦力is the rotational static friction of the connecting rod assembly, L 摩擦力 is the moment arm of the friction force of the connecting rod assembly.

[0068] Specifically, when the pedal assembly 13 is lifted from the initial position, by designing the parameters of the pneumatic lifting assembly 12 (such as air pressure value, stroke) and the structural dimensions of the connecting rod assembly 11, the product of its driving force Fspring and the lever arm Lspring (i.e., driving torque), plus the impulse Fimpulse applied by the user to the pedal assembly 13 (Fimpulse = action force × time, the action force can be 10-20N, for example), is greater than the product of the gravity Fgravity of the pedal assembly 13 and the connecting rod assembly 11 and its lever arm Lgravity (i.e., gravity torque), plus the sum of the static friction force ffriction of the connecting rod assembly 11 and the friction force of its lever arm L (i.e., friction torque). Specifically, by adjusting the installation angle α of the pneumatic lifting component 12 (that is, the angle between the pneumatic lifting component 12 and the vertical direction), the sum of the horizontal component of the driving force Fspring Fspring×sinα and the user impulse Frush is greater than the sum of the gravity Fweight and the friction force ffriction. At the same time, the rotation structure of the connecting rod component 11 is optimized (such as selecting bearings with a low friction coefficient) to reduce ffriction. When the user applies a certain impulse, the system satisfies the torque balance condition of Fspring×Lspring+Frush>Fgravity×Lgravity+ffriction×Lfriction, and conforms to the mechanical constraint relationship of Fspring×sinα+Frush>Fweight+ffriction, ensuring that the pedal component 13 can be smoothly lifted from the initial position to the use state.

[0069] In one embodiment, when the footrest assembly is raised to the end position, the following conditions are satisfied:

[0070] F 脚 +f 总摩擦力 +G 脚踏 ≤F 弹 ×sinβ

[0071] Among them, F 脚 is the force applied by the user to the pedal assembly in the vertical direction, f 总摩擦力 is the friction force of the entire movable pedal mechanism, G 脚踏 is the weight of the pedal assembly, F 弹 is the driving force of the air pressure lifting assembly, and β is the angle formed between the air pressure lifting assembly and the vertical direction.

[0072] Specifically, this embodiment defines the static balance condition when the pedal assembly 13 is lifted to the end position, which must satisfy the support force balance relationship under the user's use state, specifically expressed as: Ffoot + ftotal friction force + Gped ≤ Fspring × sinβ (where Ffoot is the vertical force applied by the user's leg, ftotal friction force is the vector sum of the friction forces of each rotating pair of the mechanism, Gped is the weight of the pedal assembly 13, and β is the real-time angle between the pneumatic lifting assembly 12 and the vertical direction when it is in the end position). In this state, the vertical support component force Fspring × sinβ generated by the pneumatic lifting assembly 12 must continuously be greater than the sum of the user load and the system's own weight to ensure that the pedal assembly 13 can stably maintain the lifted position and does not descend on its own, thereby allowing the pedal assembly 13 to stably maintain the end position, providing reliable support for the user and preventing the pedal assembly 13 from accidentally falling back due to force imbalance.

[0073] In one embodiment, when the footrest assembly descends from the end position, the following conditions are satisfied:

[0074] F 脚 +f 总摩擦力 +G 脚踏 >F 弹 ×sinβ

[0075] Among them, F 脚 is the force applied by the user to the pedal assembly in the vertical direction, f 总摩擦力 is the friction force of the entire movable pedal mechanism, G 脚踏 is the weight of the pedal assembly, F 弹 is the driving force of the air pressure lifting assembly, and β is the angle formed between the air pressure lifting assembly and the vertical direction.

[0076] Specifically, this embodiment defines the mechanical conditions for the footrest assembly 13 to descend from its final position as satisfying the inequality Ffoot + ftotal friction force + Gfoot > Fspring × sinβ, where the definitions of the parameters described above remain consistent. When the user attempts to descend the footrest assembly 13, they actively increase the downward force of their leg, Ffoot (e.g., by lightly stepping on the pedal 132), causing the total downward force of the system to exceed the supporting force component Fspring × sinβ provided by the air lift assembly 12. At this point, the footrest assembly 13 begins to descend smoothly.

[0077] In one embodiment, the slide rail assembly is provided with an elastic positioning member for positioning the footrest assembly in a hidden position, and when the footrest assembly is pulled out from the hidden position, the following conditions are satisfied:

[0078] F 拉 >f 静 +F 弹性定位件

[0079] Among them, F 拉 is the force applied by the user to the pedal assembly in the horizontal direction, f静 is the static friction of the slide rail assembly, F 弹性定位件 is the elastic force of the elastic positioning member.

[0080] Specifically, this embodiment defines the hidden position of the slide rail assembly 2. An elastic locator (such as an arched spring 23 or a magnetic adsorption device) is provided on the slide rail assembly 2. When the footrest assembly 13 is in the fully hidden position, the elastic locator provides a holding force F elastic locator to firmly lock the footrest assembly 13. The user needs to apply a horizontal pulling force F pull (for example, it can be 15-30N) to overcome the sum of the static friction force f static of the slide rail (f static can be 8-15N, for example) and the elastic force F elastic locator (i.e., satisfying F pull > f static + F elastic locator, where F elastic locator = ks, k is the elastic coefficient, s is the length of the elastic locator, and F elastic locator is a fixed value obtained through measurement, for example, it can be 10-20N) in order to make the footrest assembly 13 leave the hidden position and begin to slide. This design ensures that the footrest assembly 13 will not slide out by itself when hidden by matching the stiffness coefficient of the elastic positioning part with the friction characteristics of the slide rail, while keeping the pulling-out operation light and smooth. In specific implementation, manganese steel springs can be selected as elastic positioning parts, and their pre-pressure can be set within a certain range to balance the positioning reliability and operational comfort requirements.

[0081] In another embodiment, the slide rail assembly is provided with another elastic positioning member for positioning the pedal assembly to an initial position, and when the pedal assembly is engaged with the other elastic positioning member, the following conditions are satisfied:

[0082] F 拉 >f 静 +F 弹性定位件

[0083] Among them, F 拉 is the force applied by the user to the pedal assembly in the horizontal direction, f 静 is the static friction of the slide rail assembly, F 弹性定位件 is the elastic force of the elastic positioning member.

[0084] Specifically, this embodiment provides dual elastic locators at both ends of the slide rail assembly 2. In addition to the elastic locator in the hidden position, another elastic locator (such as an arched spring 23) is added at the initial position when the pedal assembly 13 is fully extended. When the pedal assembly 13 slides to the initial position, the locator generates a locating force F elastic locator through mechanical engagement. The user needs to apply a horizontal pulling force F pull (for example, 15-30N) to simultaneously overcome the static friction force f static of the slide rail (f static, for example, 8-15N) and the locator engagement force F elastic locator (satisfying F pull > f static + F elastic locator, where F elastic locator = ks, k is the elastic coefficient, s is the length of the elastic locator, and F elastic locator is a fixed value obtained through measurement, for example, 10-20N) in order to snap the pedal assembly 13 into the initial position. This dual locating point design ensures that the pedal is firmly stationary in the initial position by symmetrically configuring the locator spring stiffness, while also forming a consistent force gradient for the pull-out / retraction operation.

[0085] In one embodiment, when the footrest assembly slides along the slide rail assembly, the following conditions are satisfied:

[0086] F 拉 >f 静 +Na

[0087] Among them, F 拉 is the force applied by the user to the pedal assembly in the horizontal direction, f 静 is the static friction force of the slide rail assembly, N is the normal pressure of the static friction contact surface of the slide rail assembly, which is a constant value, and a is the acceleration of the pedal assembly being pulled out.

[0088] Specifically, this embodiment defines the dynamic mechanical conditions for the pedal assembly 13 as it slides on the rail. When a user applies a horizontal pulling force, F pull , to move the pedal assembly 13 , the dynamic equilibrium relationship of F pull > f static + Na must be satisfied, where f static is the static friction force at the rail contact surface (f static = μs × N, where μs is the static friction coefficient and f static can be, for example, 8-15 N), N is the constant normal pressure between the rail and the sliding member 14, and a is the instantaneous acceleration when the pedal assembly 13 is extended or retracted. This condition indicates that the user's force must simultaneously overcome static friction resistance and motion inertia resistance (which is proportional to acceleration a). By rationally designing the clearance between the sliding sleeve and the rail and selecting low-friction materials, a smooth sliding experience is ensured under normal operating forces.

[0089] Reference Figure 1In this embodiment, the connecting rod assembly 11 includes a first connecting rod 111 and a second connecting rod 112 arranged adjacent to each other in parallel. The first ends of the first connecting rod 111 and the second connecting rod 112 are both hinged to the sliding member 14, and the second ends are both hinged to the pedal assembly 13. Specifically, the connecting rod assembly 11 adopts a double-link parallel arrangement structure, including a first connecting rod 111 and a second connecting rod 112 that are parallel to each other. One end of the two connecting rods is connected to the sliding member 14 via a hinge shaft, and the other end is connected to the pedal assembly 13 via a hinge shaft. This double-link parallel arrangement structure allows the two connecting rods to always maintain synchronous movement during the deployment and folding of the pedals. Specifically, when the pneumatic lifting assembly 12 pushes the connecting rod assembly 11 to rotate, the parallel first connecting rod 111 and the second connecting rod 112 rotate synchronously with the sliding member 14 as the fulcrum, driving the pedal assembly 13 to perform a parallelogram motion around the hinge point, so that it always maintains a horizontal posture during the lifting process and avoids tilting and shaking. The parallel connecting rod structure not only ensures the smooth lifting of the footrest assembly 13 through bilateral synchronous transmission, but also reduces the stress on the single rod through symmetrical support, thereby improving the overall structural strength of the device. At the same time, it can fit compactly to the bottom of the sofa when stored, thereby optimizing space utilization.

[0090] Continue to refer to Figure 1 In this embodiment, two sets of connecting rod assemblies 11 and two sets of pneumatic lift assemblies 12 are provided. The two sets of pneumatic lift assemblies 12 respectively drive the rotation of the two corresponding sets of connecting rod assemblies 11. The two sets of connecting rod assemblies 11 are spaced apart, and a synchronization shaft 113 is fixedly connected between the two second connecting rods 112 of the two sets of connecting rod assemblies 11. Specifically, the device adopts a symmetrical arrangement structure of two connecting rod assemblies 11 and two pneumatic lift assemblies 12. The two sets of connecting rod assemblies 11 are spaced apart on both sides of the sliding member 14. Each set of connecting rod assemblies 11 is independently driven by the corresponding pneumatic lift assembly 12. The second connecting rods 112 of the two sets of connecting rod assemblies 11 are rigidly connected by a synchronization shaft 113. When the movable pedal mechanism 1 is working, the two sets of air pressure lifting components 12 move synchronously, respectively pushing the corresponding connecting rod components 11 to rotate, and at the same time ensuring that the movement of the connecting rods on both sides is always consistent through the synchronization shaft 113. This dual-drive design with the synchronization shaft 113 not only significantly improves the overall structural strength and load-bearing capacity of the pedal device, but also effectively prevents the jamming phenomenon caused by uneven force on one side, making the lifting and lowering movement of the pedal component 13 more stable and reliable, and can maintain good synchronization and stability even when used for a long time or under large loads. At the same time, the symmetrically arranged structure makes the overall force more balanced, further extending the service life of the device.

[0091] Reference Figure 4-11In this embodiment, the sliding member 14 is provided with a first limiting structure 144 for limiting the rotation range of the first link 111. When the link assembly 11 rotates to the pedal deployed position or the pedal retracted position, the first limiting structure 144 abuts the first end of the first link 111. Specifically, the sliding member 14 is a U-shaped sheet metal structure with connecting pieces 143 spaced apart on either side of its bottom. The outer wall of the left connecting piece 143 is hinged to the first end of the first link 111, and the inner wall is hinged to the first end of the second link 112. The right connecting piece 143 is symmetrically arranged with another set of link assemblies 11 in the same structure. A first limiting structure 144 is provided on the outer wall of the left connecting piece 143 and / or the right connecting piece 143, near the hinge axis of the first link 111. This limiting structure can be a limiting bump, a baffle, a limiting pin, or other various structures, which are not limited here. When the connecting rod assembly 11 rotates to the footrest deployed position, the first end of the first connecting rod 111 abuts against one side of the limiting structure, reaching the highest point and preventing the connecting rod from continuing to rotate upward. When the footrest is rotated to the footrest retracted position, the first end of the first connecting rod 111 abuts against the other side of the limiting structure and reaches the lowest point, preventing the connecting rod from continuing to rotate downward. The limiting structures on the connecting plates 143 on the left and right sides operate in the same manner. The design of this limiting structure can accurately control the rotation angle range of the connecting rod assembly 11, ensuring that the footrest can reach the optimal support height and maintain stability when deployed, and that it can be completely hidden under the bottom of the sofa when retracted. At the same time, it effectively prevents mechanical interference or structural damage caused by excessive rotation of the connecting rod, greatly improving the reliability and safety of the device.

[0092] Reference Figure 4 、 Figure 8 and Figure 10In this embodiment, a sliding groove 1111 is provided on the first end of the first connecting rod 111, and the first limiting structure 144 passes through the sliding groove 1111 to enable the first connecting rod 111 to rotate under the restriction of the sliding groove 1111; wherein, when the connecting rod assembly 11 rotates to the pedal deployed position, the first limiting structure 144 abuts against one end of the sliding groove 1111; when the connecting rod assembly 11 rotates to the pedal retracted position, the first limiting structure 144 abuts against the other end of the sliding groove 1111. Specifically, an arcuate sliding groove 1111 with the hinge point as the center is provided on the first end of the first connecting rod 111, and both ends of the sliding groove 1111 are closed. The first limiting structure 144 is in the form of a limiting rivet that passes through the arcuate sliding groove 1111 and is fixedly connected to the outer side wall of the connecting piece 143 of the sliding member 14. The diameter of the rivet head is larger than the width of the sliding groove 1111 to form a sliding limit. When the connecting rod assembly 11 rotates, the first connecting rod 111 rotates around the hinge axis, and the limit rivet slides relatively in the arc-shaped chute 1111. When the pedal is rotated to the fully extended position, the limit rivet abuts against the lower end of the chute 1111, preventing the connecting rod from continuing to rotate upward. When the pedal is rotated to the fully retracted position, the limit rivet abuts against the upper end of the chute 1111, preventing the connecting rod from continuing to rotate downward. This structural design of the arc-shaped chute 1111 combined with the limit rivet is not only more compact in space, but also can accurately limit the deployment and retraction angles of the pedal by precisely controlling the arc length and position of the chute 1111, ensuring that the pedal reaches the optimal height when deployed and is perfectly hidden when retracted. At the same time, this structure has higher mechanical strength and durability, can withstand the wear caused by frequent use, and effectively extend the service life of the device. In addition, the smooth transition of the chute 1111 reduces the impact load during movement, extending the service life of the device.

[0093] Reference Figure 4-11In this embodiment, a second limiting structure 1121 for limiting the rotation of the pedal assembly 13 is provided on the second end of the second connecting rod 112. When the connecting rod assembly 11 rotates to the pedal deployed position and the pedal retracted position, the second limiting structure 1121 abuts against the pedal assembly 13 to keep the pedal assembly 13 horizontal. Specifically, a second limiting structure 1121 is provided at the second end of the second connecting rod 112. The second limiting structure 1121 can be in the form of a boss, a limiting buckle, or a cylindrical boss, which is not limited here. The second limiting structure 1121 maintains the horizontal state of the pedal assembly 13 by abutting against the pedal assembly 13 during the movement of the connecting rod assembly 11. When the air pressure lifting assembly 12 drives the connecting rod assembly 11 to rotate, the pedal assembly 13 is prone to unexpected rotation due to the movement trajectory of the hinge point and the influence of its own gravity, causing the pedal 132 to tilt. Therefore, by providing a second limiting structure 1121 at the second end of the second connecting rod 112, when the connecting rod assembly 11 rotates to the footrest deployed position, the second limiting structure 1121 abuts against one side of the footrest assembly 13, preventing it from further rotation and locking it, ensuring that the footrest 132 maintains a horizontal support surface. When the connecting rod assembly 11 rotates to the footrest retracted position, the second limiting structure 1121 abuts against the other side of the footrest assembly 13, locking it and preventing it from further rotation, ensuring that the footrest assembly 13 can be retracted horizontally, thereby maintaining the footrest assembly 13 at both positions. This design cleverly replaces complex locking mechanisms with mechanical limiting. Not only is the structure simple and reliable, but it can also accurately control the posture of the footrest assembly 13 in both deployed and retracted extreme positions, ensuring comfort during use and ensuring that the footrest 132 is parallel to the bottom of the sofa when retracted, improving concealment and space utilization. It also avoids mechanical interference or collision problems caused by the free swinging of the footrest assembly 13, greatly improving the stability and service life of the overall structure.

[0094] Reference Figure 5 、 Figure 6 、 Figure 9 and Figure 11In this embodiment, the footrest assembly 13 includes a support frame 131, a footrest 132 fixed to the upper surface of the support frame 131, and an elastic member 133. The second end of the second connecting rod 112 is hinged to the side wall of the support frame 131, and a first and a second clip 1312 with a stepped and smoothly transitioned shape are provided on the rear end edge of the side wall of the support frame 131. One end of the elastic member 133 is connected to the side wall of the support frame 131, and the other end is connected to the second end of the second connecting rod 112, for pulling the support frame 131 to rotate; wherein, when the connecting rod assembly 11 rotates to the footrest unfolded position, the second limiting structure 1121 is snapped into the first clip 1311; when the connecting rod assembly 11 rotates to the footrest retracted position, the second limiting structure 1121 is snapped into the second clip 1312.

[0095] Specifically, the support frame 131 of the pedal assembly 13 is a U-shaped sheet metal structure. Triangular pieces 1313, narrow at the front and wide at the rear, are spaced apart on the left and right sides of the support frame 1313. The outer wall of the left triangular piece 1313 is hinged to the second end of the first connecting rod 111, and the inner wall is hinged to the second end of the second connecting rod 112. The right triangular piece 1313 is symmetrically arranged in the same structure, forming a hinged relationship that matches the connecting piece 143 of the sliding member 14. The rear edge of the triangular piece 1313 of the support frame 1313 is formed with a stepped first and second latches 1311 and 1312, which transition through an arc. The elastic member 133 can be a tension spring, one end of which is hooked to a lug on the side wall of the support frame 131 and the other end to a lug on the second end of the second connecting rod 112, providing continuous tension during the rotation of the connecting rod assembly 11. A cylindrical second retaining structure 1121 is welded to the second end of the second connecting rod 112. When the connecting rod assembly 11 rotates to the footrest deployed position, the cylindrical second retaining structure 1121 engages the first notch 1311, and the tension of the tension spring maintains the support frame 131 horizontally. When the connecting rod assembly 11 returns to the retracted position, the cylindrical second retaining structure 1121, guided along the curved transition surface, slides into the second notch 1312. The tension spring continuously applies force to keep the footrest 132 level against the sofa base. This design, through the coordination of the stepped notch with the cylindrical second retaining structure 1121 and the continuous tension of the elastic member 133, not only automatically positions and maintains the footrest 132 during deployment and retraction, but also, thanks to the curved transition notch design, ensures a smoother and more stable transition. The provision of the elastic member 133 not only ensures the retaining structure securely engages the notch, but also provides the necessary cushioning during the transition, effectively reducing mechanical shock and noise, significantly improving user comfort and product durability.

[0096] Reference Figure 2 and Figure 8In this embodiment, the first connecting rod 111 and the second connecting rod 112 both include a bent section 11a, a straight section 11b and an oblique section 11c connected in sequence, the bent section 11a is bent downward from the sliding member 14, the straight section 11b extends from the bent section 11a in a direction away from the sliding member 14, and the oblique section 11c is inclined upward from the straight section 11b toward the pedal assembly 13; wherein, an angle is formed between the cylinder 121 and the vertical direction, and the end of the piston rod 122 away from the cylinder 121 is hinged to a position of the straight section 11b of the second connecting rod 112 close to the bent section 11a. Specifically, the first connecting rod 111 and the second connecting rod 112 utilize a unique three-section structural design, including a downwardly bent section 11a connected to the sliding member 14, a horizontally extending straight section 11b, and an upwardly inclined oblique section 11c. This zigzag structure enables the connecting rod assembly 11 to be compactly folded when stowed, saving space. The first connecting rod 111 and the second connecting rod 112 are both integrally formed. The cylinder 121 is installed at a certain tilt angle, forming an angle with the vertical direction. The end of the piston rod 122 is hinged to the straight section 11b of the second connecting rod 112 near the bent section 11a. This arrangement creates an optimal transmission angle between the thrust direction of the cylinder 121 and the direction of movement of the connecting rod. When piston rod 122 extends downward, the thrust is effectively converted into an upward rotational torque on second connecting rod 112 via straight segment 11b, driving the entire connecting rod assembly 11 to deploy smoothly. This generates maximum torque on straight segment 11b of second connecting rod 112, enabling smooth lifting of footrest assembly 13 with minimal air pressure. The upwardly angled design of oblique segment 11c ensures that footrest assembly 13 can be lifted to the optimal height. This embodiment, combining the tilted mounting of cylinder 121 with the unique shape of the connecting rod, cleverly utilizes the principle of leverage, optimizing force transmission efficiency and enabling smoother and more effortless lifting. The initial downward bend of bent segment 11a provides ample rotational space for connecting rod movement, while the rigid support provided by bent segment 11a enhances the deformation resistance of connecting rod assembly 11. Furthermore, by rationally allocating the lengths and angles of each segment, the stability of the footrest during deployment and retraction is ensured, while making the overall structure more compact and fully concealed while maintaining sufficient structural strength and durability.

[0097] Reference Figure 12a-12c and Figure 7In this embodiment, the slide rail assembly 2 is provided with an elastic positioning member for fixing the sliding member 14. When the sliding member 14 slides along the slide rail assembly 2 to the pedal extended position and the pedal hidden position, the elastic positioning member is elastically engaged with the sliding member 14. Specifically, the slide rail assembly 2 is symmetrically provided with two elastic positioning members along the length direction. The elastic positioning members can adopt a manganese steel spring sheet or an elastic snap-fit ​​structure. When the sliding member 14 slides along the slide rail assembly 2 to the pedal fully extended position or the pedal fully hidden position, the elastic positioning member will automatically engage with the corresponding card slot or protrusion on the sliding member 14, generating obvious snap-fit ​​feedback. This design achieves the positioning function through elastic deformation, which can not only provide a firm position lock when the pedal is extended for use to prevent accidental sliding, but also ensure stable fixation when the pedal is hidden and stored, while retaining the appropriate unlocking force required during operation, so that the user can easily apply a push to elastically deform the positioning member to release the lock and continue sliding. This elastic positioning structure not only realizes the precise positioning of the sliding member 14 at the two extreme positions, but also reduces the impact and noise during the sliding process through the buffering effect, thereby improving the overall comfort of use. It has a simple and reliable structure and strong durability, and can maintain stable positioning performance after long-term use.

[0098] Reference Figure 7 In this embodiment, the elastic positioning member includes an arched spring piece 23 provided at the front and rear ends of the slide rail assembly 2, respectively. A retaining block 145 is provided at the front and rear ends of the sliding member 14, respectively. When the sliding member 14 slides to the pedal extended position, the retaining block 145 engages with the arched spring piece 23 at the front end of the slide rail assembly 2. When the sliding member 14 slides to the pedal hidden position, the retaining block 145 engages with the arched spring piece 23 at the rear end of the slide rail assembly 2. Specifically, the elastic positioning member employs a structure of arched spring pieces 23 arranged symmetrically front and back, with an elastically deformable arched spring piece 23 provided at each of the front and rear ends of the slide rail assembly 2, and retaining blocks 145 are provided at corresponding positions at the front and rear ends of the sliding member 14. When the sliding member 14 slides forward to the fully extended position of the pedal, the front clamping block 145 will squeeze and pass over the highest point of the front arch spring piece 23 and then snap into the inner side of the spring piece. The spring piece rebounds to produce a clear positioning snap-in feeling. Similarly, when the sliding member 14 slides backward to the fully hidden position, the rear clamping block 145 and the rear arch spring piece 23 complete the same snap-in action. This arch spring piece 23 has a progressive elastic deformation characteristic, which can not only provide sufficient holding force to ensure firm positioning, but also can be smoothly unlocked when the user applies appropriate thrust. The arch structure optimizes the force distribution and significantly improves the service life of the spring piece. The front and rear symmetrical design ensures that the extension and retraction operations feel consistent. At the same time, the precise cooperation between the clamping block 145 and the spring piece not only achieves precise positioning without looseness, but also avoids metal collision noise. The overall structure is simple, reliable and easy to maintain.

[0099] Continue to refer to Figure 12a-12c In one embodiment, the slide rail assembly 2 includes a first sliding optical axis 21 and a second sliding optical axis 22 that are spaced apart. The sliding member 14 is provided with a first sliding sleeve 141 and a second sliding sleeve 142 that are spaced apart. The first sliding sleeve 141 is slidably sleeved with the first sliding optical axis 21, and the second sliding sleeve 142 is slidably sleeved with the second sliding optical axis 22. Specifically, the slide rail assembly 2 adopts a dual-axis parallel arrangement structure. The first sliding optical axis 21 and the second sliding optical axis 22 are fixedly connected and maintained in a horizontal parallel interval by two front and rear angle irons 24. The angle irons 24 also serve as mounting parts to firmly fix the entire slide rail assembly 2 on the sofa seat frame 3. The first sliding sleeve 141 and the second sliding sleeve 142 correspondingly arranged on the sliding member 14 are made of wear-resistant POM plastic material and are precisely matched with the two sliding optical axes respectively. The POM plastic sleeve has self-lubricating properties, which not only ensures smooth sliding without the need for additional lubrication, but also effectively reduces movement noise. This dual-axis combined with dual-sleeve structural design forms a stable four-point support system, which not only ensures the smooth linear motion of the sliding member 14 during the extension and retraction process, effectively preventing shaking and jamming, but also significantly improves the load-bearing capacity and service life by reasonably distributing the force; at the same time, the precision-machined sliding mating surface combined with appropriate lubrication design makes the pedal extension and retraction operation light and smooth, ensuring sufficient structural rigidity and achieving a smooth sliding experience.

[0100] Reference Figure 13a-Figure 13c The present invention further provides a sofa comprising a seat frame 3 and a hidden sofa footrest device, wherein the hidden sofa footrest device is the aforementioned hidden sofa footrest device, and a slide rail assembly 2 is fixedly mounted on the bottom of the seat frame 3. Specifically, the hidden sofa footrest device has been described in detail in the above embodiment and will not be further described here for the sake of brevity.

[0101] Through this embodiment, the sofa realizes the invisible storage and safety control of the footrest assembly 13. The fixed installation of its slide rail assembly 2 ensures the stability of the overall structure, so that the footrest does not occupy any external space when it is hidden. When pulled out, it is prevented from automatically lifting by the torque balancing mechanism. After lifting, it can provide ergonomic leg support, ultimately forming a sofa product with high space utilization, safe and reliable use, and convenient and comfortable operation.

[0102] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A hidden sofa footrest device, characterized in that: include: The slide rail assembly is fixedly installed on the bottom of the sofa; The movable pedal mechanism includes a sliding member, a connecting rod assembly, a pneumatic lifting assembly, and a pedal assembly. The sliding member is slidably connected to the slide rail assembly. The first end of the connecting rod assembly is rotatably connected to the sliding member, and the second end is rotatably connected to the pedal assembly. The non-driving end of the pneumatic lifting assembly is rotatably connected to the sliding member, and the driving end is rotatably connected to the connecting rod assembly, so as to drive the connecting rod assembly to rotate under the action of air pressure to lift the pedal assembly. When the footrest assembly is pulled out from the bottom of the sofa to the initial position, the driving torque generated by the air pressure lifting assembly is less than or equal to the resistance torque generated by the footrest assembly and the connecting rod assembly.

2. The hidden sofa footrest device according to claim 1, characterized in that: The first end of the connecting rod assembly is provided with a rotation point a1, and the second end is provided with a rotation point a2, and the connecting rod assembly rotates around a1; the non-driving end of the pneumatic lifting assembly is provided with a rotation point b1, and the driving end is provided with a rotation point b2; wherein, a1 is adjacent to b1, and an angle is formed between the pneumatic lifting assembly and the vertical direction.

3. The hidden sofa footrest device according to claim 2, characterized in that: The connecting rod assembly includes a bent section, a straight section and an oblique section connected in sequence, the bent section bends downward from the sliding member, the straight section extends from the bent section in a direction away from the sliding member, and the oblique section is inclined upward from the straight section toward the pedal assembly; wherein, a1 is arranged at the bent section, a2 is arranged at the oblique section, and b2 is arranged at a position of the straight section close to one side of the bent section.

4. The hidden sofa footrest device according to any one of claims 1 to 3, characterized in that: When the footrest assembly is pulled out from the bottom of the sofa to the initial position, the following conditions are met: F 弹 ×L 弹 ≤F 重力 ×L 重力 +f 摩擦力 ×L 摩擦力 Among them, F 弹 is the driving force of the air pressure lifting component, L 弹 is the lever arm of the air pressure lifting assembly, F 重力 is the weight of the pedal assembly and the connecting rod assembly, L 重力 is the gravity arm, f 摩擦力 is the rotational static friction of the connecting rod assembly, L 摩擦力 is the moment arm of the friction force of the connecting rod assembly.

5. The hidden sofa footrest device according to any one of claims 1 to 3, characterized in that: When the footrest assembly is lifted from the initial position: F 弹 ×L 弹 +F 冲 >F 重力 ×L 重力 +f 摩擦力 ×L 摩擦力 Among them, F 弹 is the driving force of the air pressure lifting component, L 弹 is the lever arm of the air pressure lifting assembly, F 冲 is the impulse applied by the user to the pedal assembly, F 重力 is the weight of the pedal assembly and the connecting rod assembly, L 重力 is the gravity arm, f 摩擦力 is the rotational static friction of the connecting rod assembly, L 摩擦力 is the moment arm of the friction force of the connecting rod assembly.

6. The hidden sofa footrest device according to any one of claims 1 to 3, characterized in that: When the footrest assembly is lifted to the end position, the following conditions are met: F 脚 +f 总摩擦力 +G 脚踏 ≤F 弹 ×sinβ Among them, F 脚 is the force applied by the user to the pedal assembly in the vertical direction, f 总摩擦力 is the friction force of the entire movable pedal mechanism, G 脚踏 is the weight of the pedal assembly, F 弹 is the driving force of the air pressure lifting assembly, and β is the angle formed between the air pressure lifting assembly and the vertical direction.

7. The hidden sofa footrest device according to any one of claims 1 to 3, characterized in that: When the footrest assembly descends from the end position, the following conditions are met: F 脚 +f 总摩擦力 +G 脚踏 >F 弹 ×sinβ Among them, F 脚 is the force applied by the user to the pedal assembly in the vertical direction, f 总摩擦力 is the friction force of the entire movable pedal mechanism, G 脚踏 is the weight of the pedal assembly, F 弹 is the driving force of the air pressure lifting assembly, and β is the angle formed between the air pressure lifting assembly and the vertical direction.

8. The hidden sofa footrest device according to any one of claims 1 to 3, characterized in that: The slide rail assembly is provided with an elastic positioning member for positioning the pedal assembly in a hidden position. When the pedal assembly is pulled out from the hidden position, the following conditions are met: F 拉 >f 静 +F 弹性定位件 Among them, F 拉 is the force applied by the user to the pedal assembly in the horizontal direction, f 静 is the static friction of the slide rail assembly, F 弹性定位件 is the elastic force of the elastic positioning member.

9. The hidden sofa footrest device according to any one of claims 1 to 3, characterized in that: The slide rail assembly is provided with another elastic positioning member for positioning the pedal assembly to an initial position. When the pedal assembly is engaged with the other elastic positioning member, the following conditions are satisfied: F 拉 >f 静 +F 弹性定位件 Among them, F 拉 is the force applied by the user to the pedal assembly in the horizontal direction, f 静 is the static friction of the slide rail assembly, F 弹性定位件 is the elastic force of the elastic positioning member.

10. The hidden sofa footrest device according to any one of claims 1 to 3, characterized in that: When the footrest assembly slides along the slide rail assembly, the following conditions are met: F 拉 >f 静 +Na Among them, F 拉 is the force applied by the user to the pedal assembly in the horizontal direction, f 静 is the static friction force of the slide rail assembly, N is the normal pressure of the static friction contact surface of the slide rail assembly, which is a constant value, and a is the acceleration of the pedal assembly being pulled out.

11. The hidden sofa footrest device according to claim 1, characterized in that: The pneumatic lifting assembly includes a cylinder and a piston rod slidably connected to the cylinder. The cylinder is hinged to the sliding member, and one end of the piston rod away from the cylinder is hinged to the connecting rod assembly.

12. A sofa, characterized in that: The sofa comprises a seat frame and a hidden sofa footrest device, wherein the hidden sofa footrest device is the hidden sofa footrest device according to any one of claims 1 to 11, and the slide rail assembly is fixedly installed at the bottom of the seat frame.

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