Rocking chair

Abstract

A rocking chair includes a pair of side frames each comprising a body frame, a ground feet frame, and a rocker device. The body frame includes a front leg, a rear leg, and a cross member fixedly connecting the front leg and the rear leg. The ground feet frame is configured to be positioned on ground to provide stable support to the body frame over a fulcrum point along the ground feet frame. The body frame is configured to pivot about the fulcrum point between a reclining position and an upright position. The rocker device is disposed between the front leg and the rear leg and pivotally connected between the ground feet frame and the cross member, where the rocker device is configured to facilitate rocking kinematics when the body frame pivots about the fulcrum point.

Description

[0001] ROCKING CHAIR

[0002] CROSS-REFERENCE TO RELATED APPLICATION

[0003] This application claims the benefit of U.S. Provisional Application No. 63 / 551,139 filed on February 8, 2024, which is incorporated herein by reference in its entirety.

[0004] TECHNICAL FIELD

[0005] The present disclosure relates generally to rocking chairs. More particularly, the present disclosure relates to foldable and portable rocking chairs.

[0006] BACKGROUND

[0007] Current folding chairs on the market include mostly chairs that are either completely static when unfolded into their set-up condition for use or have several set-up conditions using an adjustable back which is set into a static position at the desired angle. A second group of folding chairs on the market are folding chairs that create a motion similar to traditional rocking chairs as a user’s weight is shifted. Existing foldable rocking chairs are constructed typically with two half frames (e.g., left and right) that can be collapsed together when in a folded state and open up to provide seating when in a set-up state. Each half of the frames may be constructed to move between forward and backward positions. For example, a foldable rocking chair is disclosed in U.S. Patent No. 10,213,023, which has a pair of roll tubes (left and right roll tubes) each mimicking the shape of an arc base in a traditional rocking chair and configured to provide for rocking motion. This type of foldable rocking chairs inherit the drawbacks in traditional rocking chairs in that no rocker device (e.g., compression spring) is provided to create rocking kinematics. In these chairs, the rocking motion is completely created by the user shifting the body weight or using legs to push, which may easily cause fatigues on the user.

[0008] Some rocking chairs therefore include a rocker mechanism (e.g., compression spring) mounted towards the back of the chair and a fulcrum point connected to a ground member of the structure that provides support for the chair and also functions as a pivotal point. During motion, the chair pivots around the fulcrum point while the rocker mechanism provides kinematics motion as the user leans backward. For example, a spring-loaded leg rocking chair as disclosed in U.S. Patent No. 10,448,740, has a pair of left and right frames each having three legs: a middle leg used as a fulcrum point, a rear leg having a spring-loaded housing in touch with the ground to provide rocking kinematics, and a front leg which lifts off of the ground or touches the ground when the chair rocks back and forth. These chairs, however, create a substantial gap between the chair’s front feet and the ground. The gap becomes open when the chair rocks rearward, and the gap becomes closed when the chair is returned into the forward position and the front leg of the chair recontacts the ground.

[0009] The repeated opening and closing of the gap with the user’s full weight creates a cycling pinch point on both sides of the chair which could lead to injury of bystanders, pets, and even potentially the seated user’s feet. With the separation of the front legs from the ground in the rearward position, the chair also loses a large portion of its footprint which is in contact with ground, resulting in reducing the balance and stability of the chair overall.

[0010] Variations of the above mentioned rocking chair include using a ground bar configured to lay flat on the ground and provide support for both the fulcrum point and the rear leg. For example, a rocking chair disclosed in U.S. Patent No. 10,874,217 includes a pair of left and right side frame assemblies and a pair of runners to be rested on the ground. The rocking chair is provided with a spring compression member projecting outwardly and downwardly from the rear of each of the frame side assemblies and received within a respective sleeve pivotally mounted to one end of a respective runner. Each frame side assembly is supported on a fulcrum member that is pivotally connected to another end of the respective runner for rocking movement of the chair frame. In another example, a rocking chair as disclosed in U.S. Patent No. 9,282,824 has a similar structure except that the front leg of one side frame assembly is elbowed to extend horizontally from the foot of the front leg, where the horizontal extension is supported by the fulcrum point on the respective runner.

[0011] Both these variations, however, have drawbacks. For example, as with the other existing rocking chairs, the front legs (in U.S. Patent No. 10,874,217, U.S. Patent No. 9,282,824) of the pair of frame assemblies are left to be lifted off of the ground or retouch the ground when the chair rocks backward and forward. As discussed above, the repeated opening and closing of a gap with the user’s full weight creates a cycling pinch point on both sides of the chair which could lead to injury of bystanders, pets, and even potentially the users. The chair also loses a large portion of its footprint which is in contact with ground, resulting in reducing the balance and stability of the chair overall. Another drawback in existing folding rocking chairs is their construction wherein the rocker mechanism comprises a tubular extension member projecting outwardly and downwardly from the middle of a vertical rear frame of at least one of the frame side assemblies housing an attached compression spring. See U.S. Patent Nos. 10,874,217 and 9,282,824. While these methods of assembly and orientation of the rocker mechanism do create a chair with rocking kinematics, the rocking mechanism is mounted behind the chair, creating an overall larger footprint of the chair. For example, when the chairs are folded, a larger space may be needed for storage. Additionally, extra materials may be used for construction of the chairs.

[0012] Other drawbacks associated with existing rocking chairs are related to how the rocking mechanism operates. For example, in existing rocking chairs, a compression spring is used with the rear legs - this creates a push instead of a pull effect that is usually provided by a traditional rocking chair through its arced feet paired with gravity when in the rearward position. This results in an unpleasant user experience in terms of tactile feedback to the user. Further, unlike traditional rocking chairs which have no abrupt landing in the return position due to its long arcing ground frame, existing folding rocking chairs with compression springs mounted to part of the rear legs often create abrupt (or unpleasant) tactile feedback to the user when the front legs directly contact the ground.

[0013] SUMMARY

[0014] At least one aspect of the exemplary embodiments relates to a rocking chair. The rocking chair includes a pair of side frames each comprising a body frame, a ground feet frame, and a rocker device. The body frame includes a front leg, a rear leg, and a cross member fixedly connecting the front leg and the rear leg. The ground feet frame is configured to be positioned on ground to provide support to the body frame over a fulcrum point along the ground feet frame. The body frame is configured to pivot about the fulcrum point between a reclining position and an upright position. The rocker device is disposed between the front leg and the rear leg and pivotally connected between the ground feet frame and the cross member, where the rocker device is configured to facilitate rocking kinematics when the body frame pivots about the fulcrum point.

[0015] This and other aspects and advantages of the exemplary embodiments will become apparent from the following detailed description considered in conjunction with the accompanying drawings. It is to be understood, however, that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention, for which reference should be made to the appended claims. Moreover, the drawings arc not necessarily drawn to scale and unless otherwise indicated, they are merely intended to conceptually illustrate the structures and procedures described therein. In addition, any suitable size, shape or type of elements or materials could be used.

[0016] BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In the drawings:

[0018] FIGS. 1A and IB show an example collapsible and portable rocking chair in an isometric view and a side view, respectively, in accordance with some embodiments;

[0019] FIG. 2A shows a main frame assembly of the example rocking chair shown in FIGS. 1A and IB, in accordance with some embodiments;

[0020] FIG. 2B shows a ground feet frame assembly of the example rocking chair shown in FIGS. 1A-1B, in accordance with some embodiments;

[0021] FIGS. 3 A and 3B show exploded views of a radial slot housing of the example rocking chair, in accordance with some embodiments;

[0022] FIGS . 4A-4C show components of the example rocking chair in a tensioned, fully reclined position, in accordance with some embodiments;

[0023] FIGS. 5A-5C show components of the example rocking chair in a resting, upright position, in accordance with some embodiments; and

[0024] FIG. 6 shows a variation of the example rocking chair in which the radial slot housing is attached to the rear leg of the body frame, in accordance with some embodiments.

[0025] DETAILED DESCRIPTION OF EMBODIMENTS

[0026] To overcome various shortcomings in the existing folding rocking chairs, the inventors of the present disclosure have developed a collapsible and portable rocking chair that uses a radial slot housing which slidably couples a ground feet frame to the front leg so that all of the chair’s ground contact points always remain in contact with the ground through the entire rocking cycle in the forward and rearward positions. This prevents the possibility of injury to bystanders, pets, or the user’s feet. The radial slot housing is assembled with a front leg impact buffer below the front leg which compresses as the rocking folding chair is brought into the forward position and the front leg contacts the buffer. This facilitates a soft landing, providing similar tactile feedback to that of a traditional rocking chair.

[0027] In addition, the portable rocking chair utilizes an extension spring housed in a tubular extension member which extends from a horizontal cross member joining the front and back legs of the frame on each side down to the grounding feet frame. This configuration provides advantages over existing portable rocking chairs in that the rocker device (e.g., extension spring) is located within the chair’s main frame, between the front legs and the rear legs, and all ground feet are in constant contact with the ground while the chair rocks forward and backward. This is substantially more compact and reduces footprint of the rocker chair in comparing to existing systems, and also saves materials for manufacturing the chair. Furthermore, the pulling of the extension spring mimics the pulling of gravity on the arced feet of a traditional rocking chair, and thus, provides similar tactile feedback to the user. All these advantages provide a pleasant user experience.

[0028] FIGS. 1A and IB show an example collapsible and portable rocking chair 10 in an isometric view and a side view, respectively, in accordance with some embodiments. As shown in FIG. 1A, rocking chair 10 includes a pair of side body frames 12, e.g., left side frame 12-1 and right side frame 12-2. As shown in FIG. IB, each side frame 12 (which can be 12-1 or 12-2) includes a ground feet frame 18 and a body frame 24. The ground feet frame 18 is configured to be in touch with the ground to provide support for the body frame 24. The body frame 24 includes a front leg 14, a rear leg 16 and a cross member 20 that fixedly connects the front leg 14 and the rear leg 16. The body frame 24 is supported on the ground feet frame 18 at multiple points, where the ground feet frame 18 extends the footprint of the chair (e.g., across the depth of the chair from the front leg to the rear leg) to provide a stable support. For example, the ground feet frame 18 may include a runner fully in touch with the ground to provide support for the chair. In another example, the ground feet frame 18 may include two or more feet (e.g., 26-1, 26-2) to be in touch with the ground.

[0029] As shown in FIG. IB, the body frame 24 is pivotally supported on the ground feet frame 18 at a fulcrum point 22 along the ground feet frame 18. In one configuration, as shown in FIGS. 2 A and 2B, a fulcrum bracket 28 is provided on the ground feet frame 18 at the fulcrum point 22. The body frame 24 includes an elbow 30 extending from the rear leg 16 and turning towards the front leg 14. The elbow 30 has an end 32 that is pivotally connected to the fulcrum bracket 28. In such configuration, the body frame 24 can rock pivotally about the fulcrum point 22, where the rear leg 16 will stay above the ground and not be in touch with the ground.

[0030] Returning to FIG. IB, while the body frame 24 pivots about the fulcrum point 22, two devices are used to restrict the movement of the body frame 24 and provide rocking kinematics: a radial slot housing 34 and a rocker device 36. Radial slot housing 34 is attached to the ground feet frame 18. It has a vertical portion 38 that is configured to limit the movement of the front leg 14. Rocker device 36 is pivotally connected to the cross member 20 at one end and pivotally connected to the ground feet frame 18 at the other end. The rocker device 36 is configured to facilitate the rocking motion of the chair when the body frame 24 is pivoting about the fulcrum point 22.

[0031] Now, the radial slot housing 34 is described further in detail. As shown in FIGS. 3A and 3B, the radial slot housing 34 has two identical halves 34-1, 34-2 that can be mated together to enclose the front leg 14 therein. As shown, the radial slot housing 34 has an elbow shape that has a first portion 38 and a second portion 40 extending generally perpendicularly from each other. The first portion 38 is configured to be installed in a vertical direction, whereas the second portion 40 is configured to be installed in a horizontal direction. As shown, the horizontal portion 40 of the radial slot housing 34 is attached to the front end 42 of the ground feet frame 18. In some embodiments, the front feet 26-2 of the ground feet frame 18 is an integrated part of the radial slot housing 34. For example, the front feet 26-2 is molded together with the radial slot housing 34. It is appreciated that the front feet 26-2 may be separate from the radial slot housing 34.

[0032] In FIGS. 3A and 3B, the vertical portion 38 of the radial slot housing 34 has a hollow cavity 44 configured to slidably receive the front leg 14 and restrict the movement of the front leg 14, which is described further in detail. The end of the front leg 14 has a radial slot pin 48 protruding from the circumference of the front leg 14 to engage with a radial slot 46 on the inner wall of the radial slot housing 34. The radial slot pin 48 is configured to slide inside the radial slot 46 between the ends 50-1 and 50-2 of the radial slot 46. When the body frame 24 pivots about the fulcrum point (e.g., fulcrum point 22, FIG. IB), the radial slot 46 limits the movement of the radial slot pin 48 between positions 50-1 and 50-2, and thus, limits the forward rocking and backward rocking. As shown in FIG. 3B, because the body frame 24 pivots about the fulcrum point 22, the movement trajectory of the end of the front leg 14 is not a straight vertical line, but rather a radial (curved) line. As such, the radial slot 46 has a shape of an arc to accommodate the radial movement of the end of the front frame 14 when the body frame 24 is pivoting about the fulcrum point 22.

[0033] As shown in FIGS. 3B, 4C and 5C, an impact buffer 52 is provided to enable soft landing of the front legs 14. For example, the impact buffer 52 is a foam pad or any other suitable materials or devices, which can be oriented upward to receive the front leg 14 that allows a soft landing of the front leg 14 when it is returned to the forward position. It is appreciated that the impact buffer 52 can be in other configurations. For example, the impact buffer 52 may be a compression spring. In some configurations, the impact buffer 52 can be installed on the inner wall of the radial slot housing 34. For example, the impact buffer 52 can be an integrated part of the inner wall of the radial slot housing 34, e.g., via a molding process. In other examples, the impact buffer 52 can be mounted to the end of the front leg 14 and move along with the front leg 14, to be in touch with a stopper on the inner wall of the radial slot housing 34.

[0034] Returning to FIG. 3A, the radial slot housing 34 has a dust cover 54 attached to the top of the radial slot housing 34 and positioned to cover the cavity 44 of the radial slot housing. In nonlimiting examples, the dust cover 54 is shaped around the front leg 14 to form a seal so that dust is prevented from getting into the radial slot housing from the gap between the front leg and the wall of the cavity of the radial slot housing. In some examples, the radial slot housing 34 also has a drain slot 56, which drains the moisture / water that gets into the radial slot housing 34 to keep the inside of the radial slot housing 34 dry.

[0035] Now, the rocker device 36 is described further in detail. As shown in FIG. 4A, in some examples, the rocker device 36 includes a housing 60 containing therein an elastic member 58 that can compress and decompress. For example, the elastic member 58 can be a spring. It is appreciated that the elastic member 58 can be made of coils, rubbery materials or any other suitable materials or devices. In non-limiting examples, when the body frame 24 pivots about the fulcrum point 22, the spring 58 inside the rocker device is compressed or decompressed, which helps facilitate a smooth rocking motion of the chair. For example, when the chair rocks rearward, the pulling of the spring 58 generates a force F that mimics the pulling of gravity on the arced feet of a traditional rocking chair. This act provides a user tactile feedhack similar to that generated by the traditional rocking chair.

[0036] Returning to FIG. IB, the positions of the fulcrum point 22 and the rocker device 36 are further explained. In the position shown in FIG. IB, the chair is in its unoccupied, non-rocking state. The rocker device 36 can be positioned to achieve ease of rocking motion and balance of the chair. For example, the fulcrum point 22 can be positioned near and underneath the buttocks area along the ground feet frame 18. This will ease the activation of the rocking motion. In other examples, in the configuration shown, the rocket device 36 is pivotally connected to the cross member 20 at point A along the cross member 20 and pivotally connected to the ground feet frame 18 at point B along the ground feet frame 18, where the rocker device 36 is positioned at an angle with respect to a vertical axis, e.g., angle a. In some embodiments, the angle a is in the range of 5-60 degrees. In one particular embodiment, the angle a is about 47 degrees.

[0037] Now returning to FIGS. 1A and 2A, the pair of side frames 12-1, 12-2 can be independent and have similar configurations. For example, the various embodiments described above are applicable to both side frames 12-1, 12-2. The side frames 12-1 and 12-2 are joined by a cross frame 62 and operated to fold in a stowed state and unfold in a set-up state. This is further explained. The cross frame 62 includes two U-shaped frames 62-1 and 62-2 that are crosscoupled each other at their middle sections. Each U-shaped frame includes a front portion and a rear portion as two arms of the U-shape, where the front portion and the rear portion are joined by a middle portion. For example, U-shaped frame 62-1 has a front portion 64-1 and a rear portion 66-1 that are joined at the middle portion 68-1. The U-shaped frame 62-2 has a front portion 64-2 and a rear portion 66-2 that arc joined by a middle portion 68-2.

[0038] The two U-shaped frames 62-1, 62-2 are cross-coupled with the two front portions 64-1, 64-2 pivotally connected (e.g., at point G) and the two rear portions 66-1, 66-2 pivotally connected, respectively. In the configuration shown, the two front portions are pivotally connected at their middle sections (shown at point G). Similarly, the two rear portions are pivotally connected at their middle sections (not shown). Furthermore, ends of the front portion and the rear portions of each U-shaped frame are pivotally connected to the front leg and rear leg of a respective side frame. For example, the end of the front portion 64-1 is pivotally connected to the front leg of side frame 12-2 (e.g., at pivot point C), whereas the end of the rear portion 66- 1 is pivotally connected to the rear leg of the side frame 12-2 (e.g., at pivot point D). The U- shapcd frame 62-2 is pivotally connected to the side frame 12-1 in a similar manner.

[0039] In the configuration shown above, the two U-shaped frames 62-1 and 62-2 can pivotally move relative to each other. For example, the U-shaped frames 62-1 and 62-2 can be collapsed together so that the two middle portions 68-1, 68-2 are in contact with each other. This causes the side frames 12-1 and 12-2 to be collapsed together, which results in the chair to be in a stowed state.

[0040] When the U-shaped frames 62-1 and 62-2 open from each other, the side frames (e.g., 12- 1, 12-2) move away from each other, which results the chair to be in a set-up state to provide seating. In this state, middle portions 68-1 and 68-2 move away from each other until each resting on a respective stopper. For example, middle portion 68-1 rests on a pair of stoppers 70-1 and 70-2 that extend respectively from the front leg and the rear leg of the side frame 12-1 towards the other side frame 12-2. Middle portion 68-2 rests on a pair of stoppers 74-1 and 74-2 that extend respectively from the front leg and the rear leg of the side frame 12-2. In the set-up state, the middle portions 68-1 and 68-2 of the U-shaped frames move away from each other to form a seating area. For example, part of a canvas 76 (or other suitable seat materials) that is attached to the middle portions 68-1 and 68-2 is stretched to form a seating area for the user. As shown in FIG. 2A, the middle portion of each of the U-shaped frames (e.g., 68-1) also extends and towards the front of the chair beyond the front portion (see protrusion 82-1) to extend the depth of the middle portion. For example, the end of the extended portion butts with the front leg. This maximizes the seating area of the canvas.

[0041] With further reference to FIGS. 1A and 2A, the side frames 12-1 and 12-2 each include an arm frame connecting the front leg and the rear leg. The side frames 12-1 and 12-2 each also include a back support. For example, side frame 12-1 includes an arm frame 78-1 connecting the front leg 14-1 and rear leg 16-1. Side frame 12-2 may additionally include a back support 80-1 extending upwardly from the rear leg 16-1. Side frame 12-2 has the same configuration as side frame 12-1. As a result, when the chair is in the set up state, part of the canvas 76 that is attached to the back supports 80-1 and 80-2 are stretched to provide back support for the user. When the side frames 12-1 and 12-2 are collapsed and the chair is folded, the canvas is tucked in between the side frames 12-1 and 12-2. Having described the various embodiments of the collapsible and portable rocking chair, the operation of the chair is described with illustrations in FIGS. 4A-5C. These illustrations demonstrate how the folding chair’s rocking system constrains the frame motion to a controlled rocking motion using the tension of the extension spring in relation to the side body frames and the ground feet frames. For simplicity, only one side frame is shown. It is appreciated that both side frames operate in the same manner. FIGS. 4A-4C show components of the example rocking chair in a tensioned, fully reclined position, in accordance with some embodiments. As the user shifts their weight backwards, the side frame pivots around the fulcrum points 22 and moves the front leg 14 with the radial slot pin 48 along the radial slot (46 in FIG. 3B), which is all housed within the radial slot housing 38. Simultaneously, the spring 58 of the rocker device 36 begins to extend while the spring housing pivots along pivot point A and point B, facilitating a smooth, constrained motion along the fulcrum while building tension which pulls the side frame 24 back toward the upright position. In this position, the radial slot housing 34 acts as a safety stop to keep the user from tipping backwards and prevent the spring from overextending.

[0042] FIGS. 5A-5C show components of the example rocking chair in a resting, upright position, in accordance with some embodiments. In this position, the radial slot housing 34 acts to facilitate a soft landing. The repeated engagement of this motion allows the user to rock back and forth. As shown, during the entire rocking motion, the ground feet frame of the rocking chair maintains full contact of the ground. This avoids the instability and possible injury to the people nearby as existed in existing rocking chairs as discussed above.

[0043] It is appreciated that the embodiments as described for collapsible and portable rocking chair (FIGS. 1A-5C) may have variations. For example, FIG. 6 shows a variation of the rocking chair in which the radial slot housing 34 is attached to the rear leg of the body frame instead of the front leg. In this variation, the fulcrum point 22 is positioned accordingly to be near and underneath the buttocks area along the ground feet frame 18 to ease activation of the rocking motion. Comparing this configuration with the embodiment shown in FIG. IB, the fulcrum point is moved closer to the radial slot housing. To achieve proper balance and easy operation of the rocking motion, the rocker device is installed closer to the front of the body frame. In addition, although the above-discussed embodiments of rocking chair are collapsible and portable, it should be apparent to a person of ordinary skill in the art that the rocking principles can be applied to rocking chairs that are not collapsible and / or portable. Having described various embodiments of a collapsible and portable rocking chair, it is expressly intended that all combinations of those elements and / or embodiments, which perform substantially the same function in substantially the same way to achieve the same results, are within the scope of the invention. Moreover, it should be recognized that structures and / or elements and / or method steps shown and / or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiments as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.

Claims

CLAIMSWhat is claimed is:

1. A rocking chair comprising: a pair of side frames each comprising: a body frame comprising a front leg, a rear leg, and a cross member fixedly connecting the front leg and the rear leg; a ground feet frame configured to be positioned on ground to provide support to the body frame over a fulcrum point along the ground feet frame, wherein the body frame is configured to pivot about the fulcrum point between a reclining position and an upright position; and a rocker device disposed between the front leg and the rear leg and pivotally connected between the ground feet frame and the cross member, the rocker device being configured to facilitate rocking kinematics when the body frame pivots about the fulcrum point.

2. The rocking chair of claim 1, wherein the body frame further comprises an elbow extending from the rear leg of the body frame in parallel with the cross member, wherein an end of the elbow is pivotally connected to the fulcrum point.

3. The rocking chair of claim 2, wherein a fulcrum bracket is provided at the ground feed frame so that the end of the elbow is pivotally connected to the fulcrum point via the fulcrum bracket.

4. The rocking chair of claim 2, wherein the ground feet frame has a length that extends at least a distance between the front leg and the rear leg of the body frame.

5. The rocking chair of claim 4, wherein when the body frame pivots about the fulcrum point: the ground feed frame stays in contact with the ground; and the rear leg stays above the ground.

6. The rocking chair of claim 1, wherein the rocker device is disposed at an angle with respect to the ground feed frame so that the rocker device is pivotally connected to the cross member at a first point and the rocker device is pivotally connected to the ground feet frame at a second point, wherein the second point is at a closer distance to the front leg of the body frame than the first point.

7. The rocking chair of claim 1, wherein the rocker device comprises a spring device that compresses or decompresses when the body frame pivots about the fulcrum point.

8. The rocking chair of claim 7, wherein when the body frame pivots in the reclining position, a pulling force is applied to the spring device of the rocker device to cause the rocker device to generate a force to return the body frame into the upright position.

9. The rocking chair of claim 1, wherein a radial slot housing is provided and configured to connect the front leg of the body frame to the ground feet frame, the radial slot housing having a cavity configured to slidably receive the front leg of the body frame when the body frame pivots about the fulcrum point.

10. The rocking chair of claim 9, wherein the radial slot housing has an elbow shape comprising a first portion configured to be fixedly attached to a front end of the ground feet frame and a second portion configured to slidably receive the front leg of the body frame.

11. The rocking chair of claim 9, wherein a pin is provided to an end of the front leg of the body frame, the pin being configured to be engaged with a radial slot in an inner wall of the radial slot housing to limit movement of the body frame.

12. The rocking chair of claim 11, wherein the radial slot in the inner wall of the radial slot housing has an end configured to limit movement of the pin to prevent the rocker device from overextending.

13. The rocking chair of claim 9, wherein an impact buffer is provided inside the radial slot housing and configured to provide a soft landing when the body frame is returned to the upright position.

14. The rocking chair of claim 9, wherein the radial slot housing includes a dust cover shaped to seal a gap between the front leg of the body frame and the cavity of the radial slot housing.

15. The rocking chair of claim 1, wherein the body frame further comprises an arm frame fixedly connecting the front leg and the rear leg of the body frame.

16. The rocking chair of claim 1, wherein the body frame further comprises a back support extending upward from the rear leg of the body frame.

17. The rocking chair of claim 1, further comprising a cross frame pivotally connecting the pair of side frames, the cross frame comprising a pair of U-shaped frames crosscoupled at middle sections and configured to open or close relative to each other, each of the pair of U-shaped frames pivotally connected to a respective one of the pair of side frames such that: when the pair of U-shaped frames close, the pair of side frames are collapsed so that the rocking chair is in a stowed state; and when the pair of U-shaped frames open, the pair of side frames move away from each other so that the rocking chair is in a set-up state.

18. The rocking chair of claim 17, wherein each of the pair of the U-shaped frames comprises a front portion and a rear portion as two arms of the U-shaped frame, and a middle portion connecting the front portion and the rear portion, wherein an end of the front portion and an end of the rear portion are respectively pivotally connected to the front leg and the rear leg of a respective side frame of the pair of side frames.

19. The rocking chair of claim 18, wherein for each of the pair of the U-shaped frames, the middle portion extends beyond the front portion to extend a seating area when the rocking chair is in the set-up state.

20. The rocking chair of claim 18, wherein the body frame of each of the pair of side frames is provided with a pair of stoppers to be in touch with the middle section of a corresponding one of the pair of U-shaped frames to limit opening of the pair of U-shaped frames when the chair is in the set-up state.

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