Leg support self-locking structure and seat

Abstract

The utility model discloses a leg support self-locking structure and a seat, the leg support self-locking structure comprises a mounting seat and a foot support, the foot support is provided with a supporting surface, and the leg support self-locking structure further comprises a connecting rod mechanism comprising a main connecting rod assembly and an auxiliary connecting rod assembly which are rotatably connected between the mounting seat and the foot support; the driving mechanism is rotationally connected to the mounting base and connected with the main connecting rod assembly, and under driving of the driving mechanism, the connecting rod mechanism drives the foot support to have an extending position far away from the mounting base and a retracting position close to the mounting base; wherein in the state of the retracting position, the main connecting rod assembly and the auxiliary connecting rod assembly are in a self-locking state, and the pulling force applied to the foot support cannot drive the connecting rod mechanism to move towards the direction of the stretching position. According to the leg support self-locking structure and the seat, self-locking can be achieved at the retracting position, and the structure is more reliable.

Description

Technical Field

[0001] The present application relates to the field of home furnishing technology, and in particular to a self-locking structure of a leg rest and a seat. Background Art

[0002] With the development of the home furnishing industry, people have more and more requirements for the functions of seating. Currently, the footrest of sofas with functional adjustment can be extended to support the legs of the occupants in a lying position, and the footrest is retracted in a sitting position. When the footrest is retracted, it needs to be locked to maintain the stability of the footrest position. The footrests currently on the market need to be locked by a locking mechanism in the locked state, and the structure and operation are complicated. Utility Model Content

[0003] The present application provides a self-locking structure for a leg rest and a seat, which can lock the retracted position of the foot rest through the self-locking of the structure itself, has a simple structure and operation, and reduces the cost of the product.

[0004] In a first aspect, the present application provides a leg rest self-locking structure, comprising a mounting seat and a foot rest, wherein the foot rest has a support surface, and further comprises:

[0005] A connecting rod mechanism, comprising a main connecting rod assembly and a slave connecting rod assembly rotatably connected between the mounting seat and the footrest;

[0006] A driving mechanism is rotatably connected to the mounting seat and connected to the main connecting rod assembly. When driven by the driving mechanism, the connecting rod mechanism drives the footrest to have an extended position away from the mounting seat and a retracted position close to the mounting seat.

[0007] Wherein, in the retracted position state, the main connecting rod assembly and the slave connecting rod assembly structure are in a self-locking state, and the pulling force applied to the foot rest cannot drive the connecting rod mechanism to move toward the extended position direction.

[0008] By adopting the above technical scheme, when the traditional leg rest device is locked in the retracted position, it is generally through an electric mechanism such as a motor to apply force to the connecting rod mechanism to limit the force on the footrest, or a separate limiting mechanism is used to limit the position of the footrest, which has a complex structure and operation and high cost. The leg rest device of the present application does not need a separate locking mechanism. In the extended position, the relative position structure of the retracted position of the connecting rod mechanism is self-locked to limit the movement of the footrest, which can prevent the footrest from being unfolded by gravity. The structure is simpler, the operation is easier, and the cost is lower. When unlocking is required, the connecting rod mechanism is driven out of the self-locking position by the driving mechanism, thereby realizing the extension of the footrest. Therefore, the driving mechanism of the present application can be driven by a motor or manually, and under the motor drive scheme, the motor only drives the movement process, and the motor does not need to work in the retracted position, thereby reducing the workload of the motor and extending the service life of the motor.

[0009] In combination with the first aspect, a further scheme, the main connecting rod assembly includes an active rod and a first connecting rod, one end of the active rod is hinged to the mounting seat and connected to the driving mechanism, and the other end is hinged to the first connecting rod, and the end of the first connecting rod away from the active rod is rotatably connected to the foot rest; the slave connecting rod assembly includes a second connecting rod, one end of the second connecting rod is hinged to the mounting seat, and the other end is rotatably connected to the foot rest, and the first connecting rod and the second connecting rod are hinged.

[0010] By adopting the above technical solution, the driving mechanism drives the active rod to move and drives the first connecting rod to move through the active rod. The movement of the first connecting rod drives the hinged second connecting rod to rotate relative to the mounting seat, and the movement of the first connecting rod and the second connecting rod drives the footrest to move. Through the connection transmission of the connecting rod mechanism, the structure is simpler and more reliable, which is not only conducive to the standardization of accessories, but also makes the design more flexible and can meet more usage requirements.

[0011] In combination with the first aspect, a further solution is that during the movement of the foot rest from the extended position to the retracted position, the angle formed by the sequential connecting lines of the hinge points of the active rod and the first connecting rod, the hinge points of the active rod and the mounting seat, and the hinge points of the second connecting rod and the mounting seat on the side close to the driving mechanism gradually decreases from the superior angle in the extended position to an obtuse angle.

[0012] By adopting the above technical solution, the angle formed by the sequential connecting lines of the hinge point of the active rod and the first connecting rod, the hinge point of the active rod and the mounting seat, and the hinge point of the second connecting rod and the mounting seat on the side close to the driving mechanism is 180°, which is the critical value before the retracted position is locked. When the foot rest moves from the extended position to the retracted position, when the above angle changes from an obtuse angle to an obtuse angle, the foot rest enters a locked state, and the foot rest cannot drive the connecting rod mechanism to rotate to the extended position after being subjected to a pulling force, thereby achieving the stability of the retracted position of the foot rest in the extended position.

[0013] In combination with the first aspect, a further solution is that the main connecting rod assembly also includes a third connecting rod and a fourth connecting rod, one end of the third connecting rod is hinged to one end of the first connecting rod away from the active rod, and the other end is hinged to the fourth connecting rod, and one end of the fourth connecting rod away from the third connecting rod is hinged to the foot rest; the slave connecting rod assembly also includes a fifth connecting rod, one end of the fifth connecting rod is hinged to one end of the second connecting rod away from the mounting seat, and the other end is hinged to the foot rest, and the fifth connecting rod is hinged to the third connecting rod.

[0014] By adopting the above technical solution, the structural design of the main connecting rod assembly and the slave connecting rod assembly improves the flexibility of the footrest extension and rotation, which can not only meet the stability in the retracted position, but also meet the design requirements of small space occupation in the retracted position, and the structure is more reasonable.

[0015] In combination with the first aspect, in a further solution, the first connecting rod, the third connecting rod, the fifth connecting rod and the second connecting rod are connected to form a four-bar linkage.

[0016] By adopting the above technical solution, the simple structure can not only meet the extension and retraction movements of the connecting rod mechanism, but also achieve self-locking in the extended position.

[0017] In combination with the first aspect, in a further solution, the active rod, the first connecting rod, the second connecting rod and the mounting seat are connected to form a four-bar linkage.

[0018] By adopting the above technical solution, the four-bar linkage formed by connecting the active rod, the first connecting rod, the second connecting rod and the mounting seat can not only meet the extension and retraction movements of the connecting rod mechanism, but also form a stable structure in the retracted position to achieve self-locking.

[0019] In combination with the first aspect, in a further solution, the third connecting rod, the fourth connecting rod, the foot rest and the fifth connecting rod are connected to form a four-bar linkage.

[0020] By adopting the above technical solution, the four-bar linkage formed by connecting the third link, the fourth link, the footrest and the fifth link can not only meet the extension and retraction movements of the linkage mechanism, but also realize the rotation of the footrest support surface and can also achieve self-locking in the retracted position.

[0021] In combination with the first aspect, a further solution is that the driving mechanism includes a driving shaft, and during the movement from the extended position to the retracted position, the distance between the hinge center line of the active rod and the first connecting rod and the axis of the driving shaft becomes smaller, and the closest distance between the support surface of the foot rest and the hinge center line of the third connecting rod and the first connecting rod first becomes smaller and then becomes larger.

[0022] By adopting the above technical solution, it is beneficial for the connecting rod mechanism to pass through the critical position and enter the locked state of the retracted position, which can further improve the locking reliability of the connecting rod mechanism in the self-locking state, thereby improving the safety of the leg support device.

[0023] In combination with the first aspect, in a further solution, during the movement from the extended position to the retracted position, the support surface of the foot rest rotates by an angle greater than 120°.

[0024] By adopting the above technical solution, a larger compression ratio of the connecting rod mechanism in the retracted position can be achieved, which can not only support the legs in the extended position, but also achieve a smaller occupied space in the retracted position.

[0025] In a second aspect, the present application provides a seat comprising the self-locking structure of the leg rest as described in the first aspect.

[0026] By adopting the above technical solution, the seat can be locked in the extended position by structural self-locking, which has a simple structure and low cost, and can also reduce the occupied space and weight of the entire seat.

[0027] In summary, the present application has at least one of the following beneficial technical effects:

[0028] 1. The self-locking structure of the leg rest of the present application locks the position of the foot rest through structural self-locking. The product has a simple structure, a large compression ratio, small space occupation and relatively light weight.

[0029] 2. The self-locking structure of the leg rest of the present application realizes locking in the retracted position through structural design without adding structural accessories. The structure is more reasonable and reliable, and the cost is lower.

[0030] 3. The seat of the present application is simple and convenient to operate, has lower cost, and can also reduce the occupied space and weight of the entire seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural schematic diagram of an embodiment of the self-locking structure of the leg support of the present application;

[0032] Figure 2 It is a structural schematic diagram of the self-locking structure of the leg support of the present application in the extended position;

[0033] Figure 3 It is a structural schematic diagram of the self-locking structure of the leg rest of the present application in the retracted position;

[0034] Figure 4 This is a schematic diagram of the structure of the connecting rod mechanism of the present application before it is retracted and self-locked;

[0035] Figure 5 It is a structural schematic diagram of the critical state of self-locking at the retracted position of the connecting rod mechanism of the present application;

[0036] Figure 6 It is a structural schematic diagram of the self-locking state of the connecting rod mechanism in the retracted position of the present application.

[0037] Reference numerals:

[0038] 1. Mounting seat; 2. Driving shaft; 3. Gear mechanism; 4. Connecting rod mechanism; 41. Active rod; 411. Toothed portion; 42. First connecting rod; 43. Second connecting rod; 44. Fifth connecting rod; 45. Third connecting rod; 46. Fourth connecting rod; 5. Footrest; 51. Support surface; 6. Handle; b. The distance between the hinge centerline of the active rod and the first connecting rod and the axis of the driving shaft; c. The shortest distance between the support surface of the footrest and the hinge centerline of the third connecting rod and the first connecting rod; d. The angle formed by the successive connecting lines of the hinge point of the active rod and the first connecting rod, the hinge point of the active rod and the mounting seat, and the hinge point of the second connecting rod and the mounting seat on the side close to the driving shaft. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. The components of the embodiments of the utility model described and shown in the drawings herein can be arranged and designed in various different configurations. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the description of the present application, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0043] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0044] Embodiment 1

[0045] See also Figure 1 and Figure 2 , discloses a structure of an embodiment of a self-locking structure of a leg rest, wherein the leg rest device comprises a mounting seat 1, a foot rest 5 and a driving mechanism, wherein the driving mechanism comprises a driving shaft 2, a gear mechanism 3 and a handle 6. The mounting seat 1 is rotatably connected to the driving shaft 2, the driving shaft 2 is connected to the gear mechanism 3, the gear mechanism 3 is connected to the connecting rod mechanism 4, and the connecting rod mechanism 4 is hinged with the foot rest 5 at one end away from the mounting seat 1. The end of the driving shaft 2 is fixedly connected to the handle 6, and the driving shaft 2 drives the connecting rod mechanism 4 to move through the gear mechanism 3 by rotating the handle 6, so that the foot rest 5 moves between a retracted position close to the mounting seat 1 and an extended position away from the mounting seat 1. The driving mechanism can also be a direct connection between the driving shaft 2 and the connecting rod mechanism 4, and the driving shaft 2 is driven to rotate by the handle 6 or the motor, while driving the connecting rod mechanism to move.

[0046] In this embodiment, two sets of leg rest self-locking structures are connected through the drive shaft 2 to form a linked whole, and jointly realize related functions, which can make the functions more reliable. Two mounting seats 1 are arranged on both sides of the axial direction of the drive shaft 2 and are pivotally connected to the drive shaft 2. The mounting seat 1 is connected to a gear mechanism 3 and a connecting rod mechanism 4, and the connecting rod mechanism 4 is hinged to the foot rest 5.

[0047] Because the leg support devices on the left and right sides have the same structure, the structure of the leg support device on the left side is described below as an example.

[0048] See also Figure 2 , which is a structure in which the leg rest self-locking structure is in the extended position. The connecting rod mechanism 4 includes a main connecting rod assembly, a slave connecting rod assembly and a foot rest 5. Under the drive of the drive shaft 2, the foot rest 5 has an extended position away from the mounting seat 1 and a retracted position close to the mounting seat 1.

[0049] The main connecting rod assembly includes an active rod 41, a first connecting rod 42, a third connecting rod 45 and a fourth connecting rod 46. The active rod 41 is integrally provided with a toothed portion 411 at one end hinged to the mounting seat, and the other end is hinged to the first connecting rod 42. The toothed portion 411 is meshed with a gear mechanism. One end of the third connecting rod 45 is hinged to one end of the first connecting rod 42 away from the active rod 41, and the other end is hinged to the fourth connecting rod 46. The end of the fourth connecting rod 46 away from the third connecting rod 45 is hinged to the footrest 5. The driven connecting rod assembly includes a second connecting rod 43 and a fifth connecting rod 44. One end of the second connecting rod 43 is hinged to the mounting seat 1, and the middle position of the first connecting rod 42 and the second connecting rod 43 is hinged to each other. One end of the fifth connecting rod 44 is hinged to one end of the second connecting rod 43 away from the mounting seat 1, and the other end is hinged to the footrest 5. The fifth connecting rod 44 and the third connecting rod 45 are hinged to each other at the middle position.

[0050] The first link 42, the third link 45, the fifth link 44 and the second link 43 form a four-bar linkage, the active rod 41, the first link 42, the second link 43 and the mounting seat 1 are connected to form a four-bar linkage, the third link 45, the fourth link 46, the foot rest 5 and the fifth link 44 are connected to form a four-bar linkage.

[0051] The rotation of the drive shaft 2 drives the gear mechanism 3 to rotate synchronously, and the gear mechanism 3 drives the active rod 41 to rotate through the toothed portion 411, and the active rod 41 drives the first connecting rod 42, the third connecting rod 45 and the fourth connecting rod 46 to move. Because the first connecting rod 42 and the second connecting rod 43 are hinged, and the fifth connecting rod 44 and the third connecting rod 45 are hinged, the main connecting rod assembly drives the second connecting rod 43 and the fifth connecting rod 44 of the slave connecting rod assembly to move synchronously during the movement. The drive shaft 2 can also be directly fixedly connected to the active rod 41, and the rotation of the drive shaft 2 drives the active rod 41 to rotate, thereby driving the entire connecting rod mechanism to move.

[0052] See also Figure 2 and Figure 3 During the movement of the main connecting rod assembly and the slave connecting rod assembly, the footrest 5 is driven to move closer to or away from the mounting seat 1 and rotate synchronously, so that the support surface 51 of the footrest 5 can support the legs upward when in the extended position, and rotate and retract when in the retracted position. During the movement from the extended position to the retracted position, the support surface 51 of the footrest 5 rotates at an angle greater than 120°.

[0053] See also Figure 4-Figure 6 The invention discloses the self-locking process and principle of the retracted position. When the footrest 5 moves from the extended position to the retracted position, the angle d formed by the connecting lines of the hinge point of the active rod 41 and the first connecting rod 42, the hinge point of the active rod 41 and the mounting seat 1, and the hinge point of the second connecting rod 43 and the mounting seat 1 on the side close to the driving shaft 2 gradually decreases from the reflex angle in the extended position to an obtuse angle.

[0054] See also Figure 4When the leg support device is about to enter the retracted position, the active rod 41 rotates clockwise, and the angle d formed by the hinge points of the active rod 41 and the first connecting rod 42, the hinge points of the active rod 41 and the mounting seat 1, and the hinge points of the second connecting rod 43 and the mounting seat 1 on the side close to the driving wheel 31 is a superior angle greater than 180°.

[0055] See also Figure 4 and Figure 5 , the active rod 41 continues to rotate clockwise, the angle d formed by the hinge points of the active rod 41 and the first connecting rod 42, the hinge points of the active rod 41 and the mounting seat 1, and the hinge points of the second connecting rod 43 and the mounting seat 1 on the side close to the driving shaft 2 becomes smaller, the distance b between the hinge center line of the active rod 41 and the first connecting rod 42 and the axis of the driving shaft 2 becomes smaller, and the closest distance c between the support surface 51 of the foot rest 5 and the hinge center line of the first connecting rod 42 and the third connecting rod 45 also becomes smaller synchronously.

[0056] See also Figure 6 , when the angle d formed by the lines connecting the hinge points of the active rod 41 and the first link 42, the hinge points of the active rod 41 and the mounting seat 1, and the hinge points of the second link 43 and the mounting seat 1 on the side close to the drive shaft 2 is 180°, it is the critical position point. When the active rod 41 continues to rotate clockwise to the retracted position, the angle d formed by the lines connecting the hinge points of the active rod 41 and the first link 42, the hinge points of the active rod 41 and the mounting seat 1, and the hinge points of the second link 43 and the mounting seat 1 on the side close to the drive shaft 2 is an obtuse angle less than 180°, the distance b between the hinge center line of the active rod 41 and the first link 42 and the axis of the drive shaft 2 continues to decrease, and the active rod 41 abuts against the drive shaft 2, and the closest distance c between the support surface 51 of the footrest 5 and the hinge center line of the first link 42 and the third link 45 slightly increases. In the retracted position, the connecting rod mechanism 4 is self-locking, and pulling the footrest 5 cannot drive the connecting rod mechanism 4 to move, and the footrest 5 maintains a relatively stable state.

[0057] Embodiment 2

[0058] This embodiment provides a seat, specifically a chair or a sofa, having the leg rest self-locking structure in the first embodiment. In the sitting state, the foot rest 5 is in the retracted position under the seat and self-locks to maintain the stability of the foot rest position.

[0059] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes, modifications, substitutions and variants, and these changes, modifications, substitutions and variants all fall within the scope of the utility model claimed for protection.

Claims

1. A leg rest self-locking structure, comprising a mounting seat (1) and a foot rest (5), wherein the foot rest (5) has a supporting surface (51), characterized in that: Also includes: A connecting rod mechanism (4) comprising a main connecting rod assembly and a slave connecting rod assembly rotatably connected between the mounting seat (1) and the footrest (5); A driving mechanism is rotatably connected to the mounting seat (1) and connected to the main connecting rod assembly. When driven by the driving mechanism, the connecting rod mechanism (4) drives the footrest (5) to have an extended position away from the mounting seat (1) and a retracted position close to the mounting seat (1); Wherein, in the retracted position state, the main connecting rod assembly and the slave connecting rod assembly structure are in a self-locking state, and the pulling force applied to the footrest (5) cannot drive the connecting rod mechanism (4) to move in the direction of the extended position.

2. The self-locking structure of the leg support according to claim 1, characterized in that: The main connecting rod assembly comprises an active rod (41) and a first connecting rod (42), one end of the active rod (41) is hinged to the mounting seat (1) and connected to the driving mechanism, and the other end is hinged to the first connecting rod (42), and the end of the first connecting rod (42) away from the active rod (41) is rotatably connected to the footrest (5); the slave connecting rod assembly comprises a second connecting rod (43), one end of the second connecting rod (43) is hinged to the mounting seat (1), and the other end is rotatably connected to the footrest (5), and the first connecting rod (42) and the second connecting rod (43) are hinged.

3. The self-locking structure of the leg support according to claim 2, characterized in that: During the movement of the footrest (5) from the extended position to the retracted position, the angle formed by the lines connecting the hinge point of the active rod (41) and the first connecting rod (42), the hinge point of the active rod (41) and the mounting seat (1), and the hinge point of the second connecting rod (43) and the mounting seat (1) on the side close to the driving mechanism gradually decreases from the superior angle in the extended position to an obtuse angle.

4. The self-locking structure of the leg support according to claim 2, characterized in that: The main connecting rod assembly also includes a third connecting rod (45) and a fourth connecting rod (46), one end of the third connecting rod (45) is hinged to one end of the first connecting rod (42) away from the active rod (41), and the other end is hinged to the fourth connecting rod (46), and one end of the fourth connecting rod (46) away from the third connecting rod (45) is hinged to the footrest (5); the slave connecting rod assembly also includes a fifth connecting rod (44), one end of the fifth connecting rod (44) is hinged to one end of the second connecting rod (43) away from the mounting seat (1), and the other end is hinged to the footrest (5), and the fifth connecting rod (44) is hinged to the third connecting rod (45).

5. The self-locking structure of the leg support according to claim 4, characterized in that: The first connecting rod (42), the third connecting rod (45), the fifth connecting rod (44) and the second connecting rod (43) are connected to form a four-bar linkage (4).

6. The self-locking structure of the leg support according to claim 4, characterized in that: The active rod (41), the first connecting rod (42), the second connecting rod (43) and the mounting seat (1) are connected to form a four-bar linkage (4).

7. The self-locking structure of the leg support according to claim 4, characterized in that: The third connecting rod (45), the fourth connecting rod (46), the footrest (5) and the fifth connecting rod (44) are connected to form a four-bar linkage (4).

8. The self-locking structure of the leg support according to claim 4, characterized in that: The driving mechanism comprises a driving shaft (2). During the movement from the extended position to the retracted position, the distance b between the hinge center line of the active rod (41) and the first connecting rod (42) and the axial center of the driving shaft (2) decreases, and the closest distance c between the support surface (51) of the footrest (5) and the hinge center line of the third connecting rod (45) and the first connecting rod (42) first decreases and then increases.

9. The self-locking structure of the leg support according to claim 1, characterized in that: During the movement from the extended position to the retracted position, the support surface (51) of the footrest (5) rotates at an angle greater than 120°.

10. A seat, characterized in that: It comprises a self-locking structure for the leg support as described in any one of claims 1 to 9.

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