FOOTREST MECHANISM, CHAIR SUPPORT STRUCTURE AND CHAIR HAVING SAME

Abstract

The present disclosure provides a footrest mechanism, a chair support structure and a chair. The footrest mechanism comprises a first support component, a first folding arm, a first rotating member and a first leg connecting rod, which can define a first four-bar mechanism. The first leg connecting rod is connected to the chair component, and is pivotally connected to the first rotating member. The first folding arm is pivotally connected to the first rotating member and the first support component, respectively. The first support component is pivotally connected to the first leg connecting rod. The first leg connecting rod is capable of moving towards or away from the chair component, and rotating relative to the first rotating member. The first leg connecting rod has a first state and a second state.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims all benefits accruing under 35 U.S.C. § 119 from China Patent Application No. 202022128862.6, filed on Sep. 24, 2020, titled “FOOTREST MECHANISM, CHAIR SUPPORT STRUCTURE AND CHAIR HAVING SAME” in the China National Intellectual Property Administration, the content of which is hereby incorporated by reference.

TECHNICAL FIELD

The present disclosure relates to chairs, in particular to a footrest mechanism, a chair support structure and a chair having the same.

BACKGROUND

Currently, a chair having a movable footrest can include a chair support structure for supporting a user and a footrest mechanism rotatably connected to the chair support structure. The footrest mechanism can be pivotally connected to the chair support structure via a leg connecting rod. The footrest mechanism can be controlled by the user to extend from under the chair support structure, so as to define a footrest for supporting legs and feet of the user, and facilitating a restful position for the user. The extended footrest mechanism can also be controlled by the user to collapse and accommodate under the chair support structure, so that the user can get up off the chair comfortably.

In order to increase the support area of the footrest mechanism to the user's legs and feet, the size of the conventional footrest mechanism is relatively large, which not only increases the weight of the footrest mechanism, but also makes the structure of the footrest mechanism to be insufficiently compact. When the footrest mechanism is in a contracted state, the footrest support component and the leg connecting rod cannot be folded well, and may even protrude outward relative to the entire chair. The foot support is not only vulnerable to external collisions, but also causes inconvenience to the transportation and transfer of the chair. In addition, the footrest support component may contaminate the clothes of the user, which affects the chair experience.

SUMMARY

It is necessary to provide an improved footrest mechanism, a chair support structure and a chair having the same.

The present disclosure provides a footrest mechanism, including a first support component, a first folding arm, a first rotating member and a first leg connecting rod. The first leg connecting rod is connected to the chair component, and is pivotally connected to the first rotating member. The first folding arm is pivotally connected to the first rotating member and the first support component, respectively. The first support component is pivotally connected to the first leg connecting rod. A first leg four-bar mechanism is defined by the first support component, the first folding arm, the first rotating member and the first leg connecting rod. The first leg connecting rod is capable of moving towards or away from the chair component, and rotating relative to the first rotating member, so as to drive the first leg four-bar mechanism to contract or expand. The first leg four-bar mechanism has a first state and a second state. When the first leg four-bar mechanism is in the first state, the first folding arm is close to the first rotating member, the first leg connecting rod is configured for driving the first support component to move close to the first rotating member, and the first leg four-bar mechanism is folded. When the first leg four-bar mechanism is in the second state, the first folding arm is away from the first rotating member, and the first leg connecting rod is configured for driving the first support component to move away from the first rotating member, and the first leg four-bar mechanism is expanded.

Furthermore, when the first leg four-bar mechanism is in the second state, the first leg four-bar mechanism is in a concave quadrilateral shape.

Therefore, when the first leg four-bar mechanism is adjusted from the first state to the second state, a dead point of the motion mechanism between the first support component and the first leg connecting rod can be avoided. Thus, the deformation of the first leg four-bar mechanism from the first state to the second state is smooth with low resistance. This reduces an extrusion force and abrasion of the pivot point between the first support component and the first leg connecting rod.

Furthermore, the first leg four-bar mechanism includes a first limiting element. When the first leg four-bar mechanism is in the first state, the first limiting element is configured for limiting at least one of the first rotating member, the first folding arm, the first support component and the first leg connecting rod, and limiting a folding range of the first leg four-bar mechanism.

Therefore, the first limiting element can facilitate avoiding the interference of elements collision or extrusion caused by unduly folding and contracting of the first leg four-bar mechanism, so as to avoid malfunctions caused by deformation of a member or overload of pivot points between members.

Furthermore, the first limiting element is fixed to the first rotating member. When the first leg four-bar mechanism is in the first state, the first limiting element is configured for limiting the first leg connecting rod.

Furthermore, the first leg four-bar mechanism includes a second limiting element. When the first leg four-bar mechanism is in the second state, the second limiting element is configured for limiting at least one of the first rotating member, the first folding arm, the first support component and the first leg connecting rod, and limiting an expanding range of the first leg four-bar mechanism.

Therefore, the second limiting element can avoid excessive expanding of the first four-bar mechanism, so as to better ensure a relative position between the first support component and the first rotating member, thereby better supporting a user's legs and feet and ensuring the comfort of the user's legs and feet.

Furthermore, the second limiting element is fixed to the first rotating member. When the first leg four-bar mechanism is in the second state, the second limiting element is configured for limiting the first support component.

The present disclosure further provides a chair support structure, including a movable chair mechanism and the footrest mechanism. The movable chair mechanism includes a chair component, and the footrest mechanism is connected to the chair component.

Furthermore, the movable chair mechanism further includes an intermediate transmission component and an installation component. The intermediate transmission component includes a first transmission connecting rod, a second transmission connecting rod and a third transmission connecting rod. The first transmission connecting rod and the third transmission connecting rod are pivotally connected to the chair component, respectively. Two ends of the second transmission connecting rod are pivotally connected to the first transmission connecting rod and the third transmission connecting rod, respectively. The installation component includes a fixing rod, a first swing arm and a second swing arm. The fixing rod is fixed to a base. Two ends of the first swing arm are pivotally connected to the first transmission connecting rod and the fixing rod, respectively. Two ends of the second swing arm are pivotally connected to the third transmission connecting rod and the fixing rod, respectively. The installation component is capable of expanding or contracting to drive the intermediate transmission component to move. The intermediate transmission component is capable of driving the chair component to move along a first direction.

Therefore, the mechanism connection between the chair component and the base can be improved by the intermediate transmission component and the installation component. When the movable chair mechanism moves, the altitudinal change of the chair component and the chair support structure is reduced, so that the user will not feel obviously up and down. In addition, the height of a sitting state, a casual state and a lying state of the chair component and the chair support structure thereof can be lowered, so that the gravity center of the user can be lowered. This facilitates eliminating chair component sway and unstable support caused by excessively high gravity center of the user, and ensuring balance of the chair component.

Furthermore, the chair support structure includes two sets of the footrest mechanism and two sets of the movable chair mechanism. The two sets of the footrest mechanism and the two sets of the movable chair mechanism are capable of moving synchronously and correlatively, respectively.

Therefore, the two sets of footrest mechanism support the user's two legs, respectively. The two sets of movable chair mechanism can support the user more stable, so as to increase support balance.

The present disclosure further provides a chair including the base and the chair support structure. The movable chair mechanism is connected to the base.

Furthermore, the chair further includes a driving component. The driving component is pivotally connected to a footrest mechanism and the chair component, respectively. The driving component is capable of driving the footrest mechanism to move towards or away from the chair component, and driving the chair component to move along the first direction.

Therefore, the expanding and contracting of the movable chair mechanism and the footrest mechanism can be synchronously electrically driven. Furthermore, while the footrest mechanism is driven by the driving component to move towards or away from the chair component, the first leg four-bar mechanism can be driven by the first leg connecting rod and the first rotating member to contract or expand. That is, each component of the footrest mechanism can simultaneously contract and expand along with the contraction and expansion of the chair component.

In the footrest mechanism of the present disclosure, the first support component can support the user's feet. The first rotating member can support the user's legs. Therefore, the first support component and the first rotating member work together to hold the user's legs and feet. The contact area between the footrest mechanism and the user's legs is enlarged, so that the comfort of the user's legs and feet is increased. At the same time, when the footrest mechanism is retracted relative to the chair component, the structure of the folded footrest mechanism can be in a smaller size, so that a space occupied by the footrest mechanism can be reduced. The first support component can be further folded to be accommodated at a side of the first rotating member near a back side of the chair. Therefore, the probability of the first support component being impacted by the outside can be reduced, and it can be also more convenient for the user to transfer or carry the chair, and prevent the first support component from contaminating the user's clothes. The user can have a better use experience of the chair.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural schematic view of a chair in a sitting state in one embodiment of the present disclosure.

FIG. 2 is a structural schematic view of a chair in a casual state in one embodiment of the present disclosure.

FIG. 3 is a structural schematic view of a chair in a lying state in one embodiment of the present disclosure.

FIG. 4 is a side view of the chair of FIG. 1 in the sitting state.

FIG. 5 is a side view of the chair of FIG. 2 in the casual state.

FIG. 6 is a side view of the chair of FIG. 3 in the lying state.

FIG. 7 is a schematic view of a first leg four-bar mechanism in a second state in one embodiment of the present disclosure.

FIG. 8 is a schematic view of a first leg four-bar mechanism in a first state in one embodiment of the present disclosure.

100 represents a footrest mechanism; 10 represents a first support component; 20 represents a first folding arm; 30 represents a first rotating member; 40 represents a first leg connecting rod; 50 represents a second leg connecting rod; 60 represents a third leg connecting rod; 70 represents a fourth leg connecting rod; 81 represents a supplemental support element; 811 represents a supplemental support portion; 82 represents a second folding arm; 300 represents a chair; 101 represents a fixing and connecting rod; 102 represents a first swing arm; 103 represents a second swing arm; 104 represents a first connecting rod; 201 represents a first transmission connecting rod; 202 represents a second transmission connecting rod; 203 represents a third transmission connecting rod; 301 represents a first rocker; 302 represents a second rocker; 303 represents a chair support structure; 304 represents a sliding connecting rod; 401 represents a push-rod motor; 402 represents a motor housing; 403 represents a telescoping rod; and 501 represents a chair transmission element.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present disclosure are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present disclosure. It is obvious that the described embodiments are only a part of the embodiments, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present disclosure without departing from the inventive scope are the scope of the present disclosure.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure is claimed. The terminology used in the description herein is for the purpose of describing particular embodiments, and is not intended to limit the disclosure. The term “or/and” as used herein includes any and all combinations of one or more of the associated listed items.

FIG. 1 is a structural schematic view of a chair in a sitting state in one embodiment of the present disclosure, FIG. 2 is a structural schematic view of a chair in a casual state in one embodiment of the present disclosure, FIG. 3 is a structural schematic view of a chair in a lying state in one embodiment of the present disclosure, FIG. 4 is a side view of the chair of FIG. 1 in the sitting state, FIG. 5 is a side view of the chair of FIG. 2 in the casual state, and FIG. 6 is a side view of the chair of FIG. 3 in the lying state.

In general, a conventional chair having a movable footrest includes a chair support structure for supporting a user and a footrest mechanism rotatably connected to the chair support structure. When the user sits or lies on this kind of chair, the footrest mechanism can be controlled by the user to extend out from the chair support structure, so as to define a footrest for supporting legs and feet of the user, facilitating rest of the user. When the user wants to leave, the extended footrest mechanism can also be controlled by the user to collapse and accommodate under the chair support structure, so that the chair can be arranged tidily and occupy a smaller space.

The conventional footrest mechanism mainly includes a leg connecting rod pivotally connected to the chair support structure, and a footrest support component pivotally connected to the leg connecting rod. Specifically, the leg connecting rod can rotate relative to the entire chair support structure, so that the footrest mechanism can expand or contract relative to the entire chair support structure. That is, the leg connecting rod not only can rotate a preset position to support the user's legs, but also can be folded and retracted relative to the chair support structure to reduce the space occupied by the chair. The footrest support component rotates relative to the leg connecting rod. The footrest support component not only can be expanded along with the expansion of the leg connecting rod to further enlarge the support area for supporting the user's legs and feet, but also can be folded along with the retraction of the leg connecting rod to avoid malfunctions such as jams caused by accidental collisions.

In the present disclosure, when the user lies on the chair, the direction that the user's legs extend is defined as the front of the chair, and the direction opposite to the front of the chair is defined as the back of the chair.

In order to increase a support area of the footrest mechanism to the user's legs and feet, the size of the conventional footrest mechanism is relatively large, which not only increases the weight of the footrest mechanism, but also makes the structure of the footrest mechanism to be insufficiently compact. When the footrest mechanism is folded and retracted, the footrest support component and the leg connecting rod cannot be folded well, and may even protrude outward relative to the entire chair. Therefore, the foot support is not only vulnerable to external collisions, but also causes inconvenience to the transportation and transfer of the chair. In addition, the footrest support component may contaminate the user's clothes, which affects the user's experience.

The present disclosure provides a footrest mechanism 100, a chair support structure and a chair 300. The chair 300 can include the chair support structure and a base. The chair support structure can include the footrest mechanism 100 and a movable chair mechanism. The movable chair mechanism can include a chair component for connecting the footrest mechanism 100.

The present disclosure provides a footrest mechanism 100, which can include a first support component 10, a first folding arm 20, a first rotating member 30 and a first leg connecting rod 40. The first support component 10 can be pivotally connected to the first leg connecting rod 40 to support the user's feet. The first folding arm 20 can be pivotally connected to the first rotating member 30 and the first support component 10, respectively. The first folding arm 20 can rotate relative to the first rotating member 30, so that the first folding arm 20 can move towards or away from the first rotating member 30. The first rotating member 30 can be pivotally connected to the first leg connecting rod 40 to support the user's legs. A first leg four-bar mechanism can be defined by the first support component 10, the first folding arm 20, the first rotating member 30 and the first leg connecting rod 40.

FIG. 7 is a schematic view of a first leg four-bar mechanism in the second state in one embodiment of the present disclosure, and FIG. 8 is a schematic view of a first leg four-bar mechanism in the first state in one embodiment of the present disclosure.

In FIG. 7 and FIG. 8, “A” represents a pivot point of the first rotating arm 20 and the first rotating member 30, “B” represents a pivot point of the first support component 10 and the first folding arm 20, “C” represents a pivot point of the first support component 10 and the first leg connecting rod 40, and “D” represents a pivot point of the first leg connecting rod 40 and the first rotating member 30. The first leg connecting rod 40 can be connected to the chair component, move towards or away from the chair component, and rotate relative to the first rotating member 30 to drive the first leg four-bar mechanism to contract or expand. The first leg four-bar mechanism can have a first state and a second state. When the first leg four-bar mechanism is in the first state, the first folding arm 20 can be close to the first rotating member 30, and the first leg connecting rod 40 can drive the first support component 10 to move towards the first rotating member 30. An acute angle can be defined by a straight line defined by “A” and “D” and a straight line defined by “A” and “B”, and the first leg four-bar mechanism can be folded. When the first leg four-bar mechanism is in the second state, the first folding arm 20 can be away from the first rotating member 30, and the first leg connecting rod 40 can drive the first support component 10 to move away from the first rotating member 30. An obtuse angle can be defined by the straight defined by “A” and “D” and the straight line defined by “A” and “B”, and the first leg four-bar mechanism can be expanded.

It should be noted that in the present disclosure, the first leg connecting rod 40 can be directly connected to the chair component, or indirectly connected to the chair component via other leg connecting rods. Furthermore, in other embodiments of the present disclosure, the footrest mechanism 100 may include other leg connect rods, but is not limited to the first leg connect rod 40; and the first rotating member 30 can be connected to the chair component via other leg connecting rods.

Specifically, in an embodiment of the present disclosure (which is named the present disclosure for short hereinafter), the footrest mechanism 100 can further include a second leg connecting rod 50, a third leg connecting rod 60 and a fourth leg connecting rod 70. A first end of the second leg connecting rod 50 can be pivotally connected to a first rotating member 30, and a second end of the second leg connecting rod 50 can be pivotally connected to a first end of the fourth leg connecting rod 70. A first end of the first leg connecting rod 40 away from the first support component 10 can be pivotally connected to the third leg connecting rod 60. A second end of the fourth leg connecting rod 70 away from the second leg connecting rod 50 can be pivotally connected to the chair component. A second end of the third leg connecting rod 60 away from the first leg connecting rod 40 can be pivotally connected to chair component. Furthermore, the second leg connecting rod 50 and the third leg connecting rod 60 can be pivotally connected to each other and define a cross.

A second leg four-bar mechanism can be defined by the first rotating member 30, the first leg connecting rod 40, the second leg connecting rod 50 and the third leg connecting rod 60. A third leg four-bar mechanism can be defined by the second leg connecting rod 50, the third leg connecting rod 60, the fourth leg connecting rod 70 and the chair component. The third leg four-bar mechanism can be driven by an energy source, which is disposed out of the footrest mechanism 100, to deform, so as to drive the second leg four-bar mechanism to deform. Therefore, the first rotating member 30 can be driven by the first leg connect rod 40 to rotate relative to the second leg connecting rod 50, so that the entire first leg four-bar mechanism can expand and contract relative to the second leg connecting rod 50. When the first leg four-bar mechanism is in a first state, the first rotating member 30 can be close to the second leg connecting rod 50, the first four-bar mechanism can be close to the second leg connecting rod 50, and the footrest mechanism 100 can be folded and accommodated from under the chair component. When the first leg four-bar mechanism is in a second state, the first rotating member 30 can be away from the second leg connecting rod 50, and the entire first leg four-bar mechanism can be away from the second leg connecting rod 50, and the entire footrest mechanism 100 can be fully expanded.

The present embodiment is a preferred embodiment of the present disclosure, and will be described in detail hereinafter. Expanded technical solutions of the present embodiment or simplified technical solutions of the present embodiment will not be described in details hereinafter.

In the footrest mechanism 100 of the present disclosure, the first support component 10 can support the user's feet. The first rotating member 30 can support the user's legs. Therefore, the first support component 10 and the first rotating member 30 can work together to hold the user's legs and feet. The contact area between the footrest mechanism 100 and the user's legs can be enlarged, so that the comfort of the user's legs and feet can be increased. At the same time, when the footrest mechanism 100 is retracted relative to the chair component, the structure of the folded footrest mechanism 100 can be more compact, so that a space occupied by the footrest mechanism 100 can be reduced. The first support component 10 can be further folded to be accommodated at a side of the first rotating member 30 near the back side of the chair 300. Therefore, the probability of the first support component 10 being impacted by the outside can be reduced, and it can be also more convenient for the user to transfer or carry the chair 300, and can prevent the first support component 10 from contaminating the user's clothes. The user can have a better use experience of the chair 300.

Referring to FIG. 7, when the first leg four-bar mechanism is in the second state, the first leg four-bar mechanism can be in a concave quadrilateral shape. That is, in the second state, a concave quadrilateral shape can be defined by the straight defined by A and B, the straight defined by A and D, the straight defined by C and B and the straight defined by C and D.

Therefore, when the first leg four-bar mechanism is adjusted from the first state to the second state, a dead point of the motion mechanism between the first support component 10 and the first leg connecting rod 40 can be avoided. Thus, the deformation of the first leg four-bar mechanism from the first state shown in FIG. 8 to the second state shown in FIG. 7 can be smooth with low resistance. This can reduce an extrusion force and abrasion of the pivot point between the first support component 10 and the first leg connecting rod 40.

Furthermore, the first leg four-bar mechanism can include a first limiting element. The first limiting element can be fixed to at least one of the first rotating member 30, the first folding arm 20, the first support component 10 and the first leg connecting rod 40. When the first leg four-bar mechanism is in the first state, the first limiting element can be configured for limiting at least one of the first rotating member 30, the first folding arm 20, the first support component 10 and the first leg connecting rod 40, which is not provided with the first limiting element, and limiting a folding range of the first leg four-bar mechanism.

Therefore, the first limiting element can facilitate avoiding the interference of collision or extrusion caused by unduly fold and contract of the first leg four-bar mechanism, so as to avoid malfunctions caused by deformation of a member or overload of pivot points between members.

Specifically, the first limiting member can be fixed to the first rotating member 30. When the first leg four-bar mechanism is in the first state, the first limiting element can be configured for limiting the first leg connecting rod 40.

Therefore, the first limiting element can facilitate avoiding the interference of elements collision or extrusion caused by unduly fold and contract of the first leg four-bar mechanism, so as to avoid malfunctions caused by deformation of a member or overload of pivot points between members.

Furthermore, a first leg four-bar mechanism can further include a second limiting element. The second limiting element can be fixed to at least one of the first rotating member 30, the first folding arm 20, the first support component 10 and the first leg connecting rod 40. When the first leg four-bar mechanism is in the second state, the second limiting element can be configured for limiting at least one of the first rotating member 30, the first folding arm 20, the first support component 10 and the first leg connecting rod 40, which is not provided with the second limiting element, and limiting an expanding range of the first leg four-bar mechanism.

Specifically, the second limiting member can be fixed to the first rotating member 30. When the first leg four-bar mechanism is in the second state, the second limiting element can be configured for limiting the first support component 10.

Therefore, the second limiting element can avoid excessive expanding of the first four-bar mechanism, so as to better ensure a relative position between the first support component 10 and the first rotating member 30, thereby better supporting a user's legs and feet and ensuring the comfort of the user's legs and feet.

Furthermore, in the present embodiment, the footrest mechanism 100 can further include a supplemental support component. The supplemental support component can be pivotally connected to the first leg connecting rod 40 and the second leg connecting rod 50, respectively. Specifically, the supplemental support component can include a supplemental support element 81 and a second folding arm 82. The supplemental support element 81 can be pivotally connected to the second folding arm 82. One end of the second folding arm 82 can be pivotally connected to the first leg connecting rod 40. One end of the supplemental support element 81 can be pivotally connected to the second leg connecting rod 50. The supplemental support element 81 can be provided with a supplemental support portion 811.

The supplemental support component can be configured for further enlarging the support area of the footrest mechanism 100 to the user's legs, so as to improve the user's comfort when the chair 300 is in the lying state. When the first leg four-bar mechanism is in the first state, the supplemental support component can be folded and retracted relative to the first rotating member 30, and accommodated at the side of the first rotating member 30 near the back side of the chair 300. When the first leg four-bar mechanism is in the second state, the supplemental support component can be expanded relative to the first leg connecting rod 40 and the second leg connecting rod 50. The supplemental support portion 811, the first rotating member 30 and the first support component 10 are at the same altitude.

In other embodiments, the supplemental support element and the second folding arm may be integrated.

Furthermore, in the chair support structure of the present disclosure, the movable chair mechanism further can include an intermediate transmission component and an installation component. The intermediate transmission component can be actively connected to the chair component and the installation component. The intermediate transmission component can include a first transmission connecting rod 201, a second transmission connecting rod 202 and a third transmission connecting rod 203. The first transmission connecting rod 201 and the third transmission connecting rod 203 can be pivotally connected to the chair component, respectively. Two ends of the second transmission connecting rod 202 can be pivotally connected to the first transmission connecting rod 201 and the third transmission connecting rod 203, respectively.

Specifically, in the present embodiment, the chair component can include a chair support structure 303, a sliding connecting rod 304, a first rocker 301 and a second rocker 302. The chair support structure 303 can be configured for accommodating the user and can move relative to a chair base (not shown in the figures). The sliding connecting rod 304 can be configured for connecting the chair base, and pivotally connected to the first rocker 301 and the second rocker 302, respectively. An end of the first rocker 301 away from the sliding connecting rod 304 can be pivotally connected to the chair support structure 303. An end of the second rocker 302 away from the sliding connecting rod 304 can be pivotally connected to the chair support structure 303. A first four-bar mechanism can be defined by the chair support structure 303, the first rocker 301, the second rocker 302 and the sliding connecting rod 304. In the first four-bar mechanism, the first rocker 301 and the second 302 can swing relative to the sliding connecting rod 304, to define a trace of the expansion and contraction, and drive the chair support structure 303 to move.

In some embodiments, the extended chair support structure can have a length in a range of 450 mm to 580 mm. Accordingly, a distance between a pivot point of the chair support structure 303 and the first rocker 301 and a pivot point of the chair support structure 303 and the second rocker 302 can be in a range of 350 mm to 370 mm

The chair support structure 303 of the present disclosure can be used for a chair which is mainly used in the sitting state or the casual state. The chair component and the chair support structure can have a lighter weight, and the structure of the chair is light and handy. Thus, the chair support structure 303 may also be a component of a normal casual chair.

In other embodiments, the chair support structure may have a larger size. Specifically, the extended chair support structure can have a length in a range of 580 mm to 700 mm. Accordingly, the distance between the pivot point of the chair support structure and the first rocker and the pivot point of the chair support structure and the second rocker can be in a range of 370 mm to 450 mm.

In these embodiments, the distance between the pivot point of the chair support structure and the first rocker and the pivot point of the chair support structure and the second rocker can be enlarged, so that chair support structure can have a larger length. The chair support structure can be used in a chair which is mainly used in the sitting state or the casual state. The first rocker and the second rocker swing relative to the sliding connecting rod, and the influence on the gravity center of the chair support chair structure can be further reduced. Furthermore, the height of gravity center of the chair support structure can be further decreased without changing the structure and connection of the first rocker, the second rocker and the sliding connecting rod. Therefore, when the chair is in the casual state and the lying state, the balance of the user can be ensured. Thus, the chair structure can be used as a component of a chair for a deep rest. A lifting height of the seat can be lowered accordingly to better accommodate the user.

Specifically, the lifting height of the seat in one embodiment can be lowered in a range of 145 mm to 160 mm.

An end of the chair support structure 303 near the user's feet can be pivotally connected to the third leg connecting rod 60 and the fourth leg connecting rod 70, respectively. The third leg connecting rod 60 and the fourth leg connecting rod 70 can be driven by an external energy source, to drive the entire footrest mechanism 100 to expand or contract relative to the chair support structure 303. The external energy source can by a driving force from the user, or can be given an independent electrical driving component disposed in the chair 300.

The installation component can include a fixing rod 101, a first swing arm 102 and a second swing arm 103. The fixing rod 101 is fixed to the base. Two ends of the first swing arm 102 can be pivotally connected to the first transmission connecting rod 201 and the fixing rod 101. Two ends of the second swing arm 103 can be pivotally connected to the third transmission connection rod 203 and the fixing rod 101, respectively.

In the present embodiment, the first swing arm 102 and the second swing arm 103 can swing relative to the fixing rod 101. Therefore, installation component can drive the second transmission connection rod 202 to move, so as to drive the entire intermediate transmission component to move. In addition, the first transmission connecting rod 201 and the third transmission connecting rod 203 can move relative to the second transmission connection rod 202, so that the intermediate transmission mechanism can drive the sliding connecting rod 304 to move, thereby the sliding connecting rod 304 can drive the entire chair component to move along a first direction.

Referring to FIG. 6, the first direction is a direction parallel to the fixing rod 101 and towards the user's feet, i.e., the direction of the arrow in FIG. 6. The chair support structure 303 can move along a direction parallel to or substantially parallel to the fixing rod 101. When the user sits on the chair 300, the chair support structure 303 can protrude along the first direction. After the user uses the chair 300, the chair support structure 303 can retract along a direction opposite to the first direction.

The movable chair component can be driven by an external energy source, so that the chair 300 can be gradually expanded from the sitting state to the casual state or the lying state.

Furthermore, in the present embodiment, the installation component can further include a first connecting rod 104. An end of the first connecting rod 104 can be pivotally connected to the second swing arm 103, and the other end of the first connecting rod 104 can be pivotally connected to the second transmission connecting rod 202. Specifically, the second swing arm 103 can be located near the back side of the chair 300, and the first swing arm 102 can be located near the front side of the chair 300. A second four-bar mechanism can be defined by the first connecting rod 104, the second transmission connecting rod 202, the second swing arm 103 and the third transmission connecting rod 203. Therefore, the variance of the intermediate component and the installation component can be smaller, which facilitates defining a moving trace of the movable chair mechanism and avoiding disorder movement of each element.

Furthermore, in the present embodiment, the chair support structure can include two sets of the footrest mechanism 100 and two sets of the movable chair mechanism. The two sets of the footrest mechanism and the two sets of the movable chair mechanism can move synchronously and correlatively, respectively.

Furthermore, the chair 300 in the present disclosure can further include a driving component. The driving component can be pivotally connected to the footrest mechanism 100 and the chair component, respectively. The driving component 100 can drive the footrest mechanism 100 to move towards or away from the chair component, and drive the chair component to move along the first direction.

Specifically, in the present embodiment, the driving component can be a push-rod motor 401 pivotally connected to the base, which can include a motor housing 402 and a telescoping rod 403. The motor housing 402 can be pivotally connected to the base via a U-shape seat. The telescoping rod 403 can be disposed in the motor housing 402, and can expand and retract relative to the motor housing 402 along an axial direction of the telescoping rod 403. The terminal end of the telescoping rod 403 can be pivotally connected to a chair transmission member 501 via a U-shape seat. One end of the chair transmission member 501 is pivotally connected to the fourth leg connecting rod 70, and the other end of the chair transmission member 501 can be pivotally connected to the sliding connecting rod 304. When the push-rod motor 401 is started, the telescoping rod 403 can be driven by the push-rod motor 401 to gradually expand or contract, and drive the footrest mechanism 100 to move relative to or away from the chair component at the same time.

In the footrest mechanism 100 of the present disclosure, the first support component 10 can support the user's feet. The first rotating member 30 can support the user's legs. Therefore, the first support component 10 and the first rotating member 30 can work together to hold the user's legs and feet. The contact area between the footrest mechanism 100 and the user's legs can be enlarged, so that the comfort of the user's legs and feet can be increased. At the same time, when the footrest mechanism 100 is retracted relative to the chair component, the structure of the folded footrest mechanism 100 can be in smaller size, so that a space occupied by the footrest mechanism 100 can be reduced. The first support component 10 can be further folded to be accommodated at a side of the first rotating member 30 near the back side of the chair 300. Therefore, the probability of the first support component 10 being impacted by the outside can be reduced, and it can be also more convenient for the user to transfer or carry the chair 300, and can prevent the first support component 10 from contaminating the user's clothes. The user can have a better experience with the chair 300.

The technical features of the above-described embodiments may be combined in any combination. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, all should be considered as the scope of this disclosure.

The above-described embodiments are merely illustrative of several embodiments of the present disclosure, and the description thereof is relatively specific and detailed, but is not to be construed as limiting the scope of the disclosure. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the disclosure. Therefore, the scope of the disclosure should be determined by the appended claims.

Claims

1. A footrest mechanism, comprising a first support component, a first folding arm, a first rotating member and a first leg connecting rod; wherein the first leg connecting rod is connected to the chair component, and is pivotally connected to the first rotating member; the first folding arm is pivotally connected to the first rotating member and the first support component, respectively; and the first support component is pivotally connected to the first leg connecting rod; a first leg four-bar mechanism is defined by the first support component, the first folding arm, the first rotating member and the first leg connecting rod four-bar;

the first leg connecting rod is capable of moving towards or away from the chair component, and rotating relative to the first rotating member, so as to drive the first leg four-bar mechanism to contract or expand;

the first leg four-bar mechanism has a first state and a second state;

when the first leg four-bar mechanism is in the first state, the first folding arm is close to the first rotating member, the first leg connecting rod is configured for driving the first support component to move close to the first rotating member, and the first leg four-bar mechanism is folded; and

when the first leg four-bar mechanism is in the second state, the first folding arm is away from the first rotating member, and the first leg connecting rod is configured for driving the first support component to move away from the first rotating member, and the first leg four-bar mechanism is expanded.

2. The footrest mechanism of claim 1, wherein the first leg four-bar mechanism is in a concave quadrilateral shape when the first leg four-bar mechanism is in the second state.

3. The footrest mechanism of claim 1, wherein the first leg four-bar mechanism comprises a first limiting element; and when the first leg four-bar mechanism is in the first state, the first limiting element is configured for limiting at least one of the first rotating member, the first folding arm, the first support component and the first leg connecting rod, and limiting a folding range of the first leg four-bar mechanism.

4. The footrest mechanism of claim 3, wherein the first limiting element is fixed to the first rotating member; and when the first leg four-bar mechanism is in the first state, the first limiting element is configured for limiting the first leg connecting rod.

5. The footrest mechanism of claim 1, wherein the first leg four-bar mechanism comprises a second limiting element; when the first leg four-bar mechanism is in the second state, the second limiting element is configured for limiting at least one of the first rotating member, the first folding arm, the first support component and the first leg connecting rod, and limiting an expanding range of the first leg four-bar mechanism.

6. The footrest mechanism of claim 5, wherein the second limiting element is fixed to the first rotating member; and when the first leg four-bar mechanism is in the second state, the second limiting element is configured for limiting the first support component.

7. A chair support structure, comprising a movable chair mechanism and a footrest mechanism of claim 1, wherein the movable chair mechanism comprises a chair component, and the footrest mechanism is connected to the chair component.

8. The chair support structure of claim 7, wherein the movable chair mechanism further comprises an intermediate transmission component and an installation component, wherein the intermediate transmission component comprises a first transmission connecting rod, a second transmission connecting rod and a third transmission connecting rod;

the first transmission connecting rod and the third transmission connecting rod are pivotally connected to the chair component, respectively; and two ends of the second transmission connecting rod are pivotally connected to the first transmission connecting rod and the third transmission connecting rod, respectively;

the installation component comprises a fixing rod, a first swing arm and a second swing arm; wherein the fixing rod is fixed to a base, two ends of the first swing arm are pivotally connected to the first transmission connecting rod and the fixing rod, respectively; two ends of the second swing arm are pivotally connected to the third transmission connecting rod and the fixing rod, respectively; and

the installation component is capable of expanding or contracting to drive the intermediate transmission component to move, and the intermediate transmission component is capable of driving the chair component to move along a first direction.

9. The chair support structure of claim 7, wherein the chair support structure comprises two sets of the footrest mechanism and two sets of the movable chair mechanism, and the two sets of the footrest mechanism and the two sets of the movable chair mechanism are capable of moving synchronously and correlatively, respectively.

10. A chair, comprising the base and the chair support structure of claim 7, wherein the movable chair mechanism is connected to the base.

11. The chair of claim 10, wherein the chair further comprises a driving component, the driving component is pivotally connected to the footrest mechanism and the chair component, respectively; and

the driving component is capable of driving the footrest mechanism to move towards or away from the chair component, and driving the chair component to move along the first direction.