Anti-back rubbing rotating device and chair and bed having the same

Abstract

The present invention discloses an anti-back rubbing rotating device and a chair and a bed having the same. The anti-back rubbing rotating device comprises a backrest frame, a seat frame and a rotating connecting piece, wherein the rotating connecting piece is respectively connected to the backrest frame and the seat frame, and the backrest frame can be rotated relative to the seat frame through the rotating connecting piece. A retractable push rod arranged on the backrest frame is rotatably connected to an extended mounting frame of the seat frame, so that the backrest frame rotates relative to the seat frame around the rotation connection point between the push rod and the extended mounting frame, while improving the stability of the rotation adjustment of the backrest frame, the backrest frame can fit the user's back, thereby reducing the relative movement of the backrest frame and the user's back, reducing the back rubbing feeling, and improving the user's use experience.

Description

Technical Field

[0001] The invention relates to the technical field of furniture, and in particular to an anti-back-rubbing rotating device and a chair and a bed having the same. Background Art

[0002] Currently, chairs or beds on the market are equipped with a rotatable backrest structure, which drives the backrest to rotate and adjust through rotating parts. During the backrest adjustment process, friction between the user's back and the backrest will cause a rubbing sensation, which reduces the user experience. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the present invention provides an anti-back rubbing rotation device and a chair and a bed having the same, which can reduce the back rubbing feeling during the rotation and adjustment of the backrest, thereby improving the user experience.

[0004] In the first aspect, the present invention provides an anti-rub back rotation device, comprising a backrest frame, a seat frame and a rotating connecting piece, one end of the rotating connecting piece is connected to the backrest frame, and the other end is connected to the seat frame, the seat frame is provided with an extending mounting frame, the backrest frame is provided with a retractable push rod, the push rod is rotatably connected to the extending mounting frame, and the backrest frame can rotate relative to the seat frame around the connection point between the push rod and the extending mounting frame.

[0005] The anti-back rubbing rotation device according to the embodiment of the present invention has at least the following beneficial effects: the rotating connecting piece is connected to the backrest frame and the seat frame respectively, and the backrest frame can be rotated relative to the seat frame through the rotating connecting piece. The retractable push rod arranged on the backrest frame is rotatably connected with the extension mounting frame of the seat frame, so that the backrest frame rotates relative to the seat frame around the rotation connection point between the push rod and the extension mounting frame, thereby improving the stability of the rotation adjustment of the backrest frame. And due to the limitation of the rotating connecting piece, during the rotation adjustment of the backrest frame, the push rod performs a telescopic movement, and the length of the telescopic adjustment push rod and the shape of the rotational adjustment rotating connecting piece are adjusted to adjust the relative distance between the backrest frame and the extension mounting frame, so that the backrest frame can fit the user's back, thereby reducing the relative movement distance between the backrest frame and the user's back, reducing the back rubbing feeling, and improving the user's experience.

[0006] According to some embodiments of the present invention, the rotating connecting member includes a rocker, a first connecting rod, a slider and a seat frame fixing block, one end of the rocker is hinged to one end of the first connecting rod, the other end of the first connecting rod is rotationally connected to the seat frame fixing block, the other end of the rocker is rotationally connected to the slider, the slider is arranged on the backrest frame, and the seat frame fixing block is arranged on the seat frame. The rocker and the first connecting rod of the rotating connecting member can rotate with each other, and the rotating connecting member can make the backrest frame fit the user's back, reduce the feeling of back rubbing, and improve the user's experience.

[0007] According to some embodiments of the present invention, the rotating connecting member further comprises a second connecting rod and a backrest frame fixing block, the second connecting rod is hinged to the first connecting rod, the second connecting rod is rotatably connected to the backrest frame fixing block, and the backrest frame fixing block is arranged on the backrest frame. The second connecting rod and the seat frame fixing block cooperate with the first connecting rod to improve the smoothness and stability of the rotation of the backrest frame relative to the seat frame.

[0008] According to some embodiments of the present invention, the distance from the connection point between the push rod and the extended mounting frame to the backrest frame is determined by the length of the rocker arm. The length of the rocker arm can be adjusted to enable the rotation distance and position of the backrest frame to fit the user's back and reduce the feeling of rubbing the back.

[0009] According to some embodiments of the present invention, the anti-rubbing back rotation device further includes a driving device for driving the backrest frame to rotate relative to the seat frame around the connection point between the push rod and the extended mounting frame. The driving device can provide power for the backrest frame to rotate, which is convenient for users to use.

[0010] According to some embodiments of the present invention, the driving device includes a motor for driving the push rod to extend and retract, and the motor is arranged in the push rod. The electric driving device provides power for the push rod to extend and retract to drive the backrest frame to rotate, which is convenient for adjustment.

[0011] According to some embodiments of the present invention, the anti-rub back rotation device also includes a locking device for locking the change in the length of the push rod. The locking device is arranged inside the push rod and is used to adjust and lock the length of the retractable push rod so that the backrest fits the user's back during the rotation process, thereby improving the user's comfort.

[0012] According to some embodiments of the present invention, a buffer element for buffering and shock absorption is arranged in the push rod to buffer and shock absorb the rotating backrest frame, thereby improving the user's comfort level.

[0013] In a second aspect, the present invention further provides a chair, comprising the anti-rub back rotation device as described in the first aspect above.

[0014] The chair according to the embodiment of the present invention has at least the following beneficial effects: the rotating connecting piece is respectively connected to the backrest frame of the chair and the seat frame of the chair, and the backrest frame of the chair can be rotated relative to the seat frame of the chair through the rotating connecting piece. The retractable push rod arranged on the backrest frame is rotatably connected to the extension mounting frame of the seat frame, so that the backrest frame rotates relative to the seat frame around the rotation connection point between the push rod and the extension mounting frame, thereby improving the stability of the rotation adjustment of the backrest frame of the chair. In addition, due to the limitation of the rotating connecting piece, during the rotation adjustment of the backrest frame of the chair, the push rod performs a telescopic movement, and the length of the telescopic adjustment push rod and the shape of the rotational adjustment rotating connecting piece are used to adjust the relative distance between the backrest frame of the chair and the extension mounting frame, so that the backrest frame of the chair can fit the back of the user, thereby reducing the relative movement distance between the backrest frame of the chair and the back of the user, reducing the back-rubbing feeling, and improving the user experience.

[0015] In a third aspect, the present invention further provides a bed, comprising the anti-rub back rotation device as described in the first aspect above.

[0016] The bed according to the embodiment of the present invention has at least the following beneficial effects: the rotating connecting member is connected to the backrest frame of the bed and the seat frame of the bed respectively, and the backrest frame of the bed can be rotated relative to the seat frame of the bed through the rotating connecting member. The retractable push rod arranged on the backrest frame of the bed is rotatably connected to the extension mounting frame of the seat frame, so that the backrest frame of the bed rotates relative to the seat frame around the rotation connection point between the push rod and the extension mounting frame, thereby improving the stability of the rotation adjustment of the backrest frame of the bed. In addition, due to the limitation of the rotating connecting member, during the rotation adjustment of the backrest frame of the bed, the push rod performs a telescopic movement, and the length of the telescopic adjustment push rod and the shape of the rotational adjustment rotating connecting member are used to adjust the relative distance between the backrest frame of the bed and the extension mounting frame, so that the backrest frame of the bed can fit the back of the user, thereby reducing the relative movement distance between the backrest frame of the bed and the back of the user, reducing the back-rubbing feeling, and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0018] Figure 1 A schematic structural diagram of an anti-rubbing back rotation device provided in an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A schematic structural diagram of the anti-rubbing back rotating device from another angle shown in ;

[0020] Figure 3 for Figure 1 A schematic structural diagram of the anti-rubbing back rotating device from another angle is shown in FIG.

[0021] Figure numerals: anti-back rubbing rotating device 100, backrest frame 200, seat frame 300, rotating connecting piece 400, rocker arm 410, first connecting rod 420, seat frame fixing block 430, slider 440, second connecting rod 450, backrest frame fixing block 460, push rod 500, and extending mounting frame 600. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0026] The present invention proposes an anti-back rubbing rotating device and a chair and a bed having the same. The rotating connector is respectively connected to a backrest frame and a seat frame, and the backrest frame can be rotated relative to the seat frame through the rotating connector. A retractable push rod arranged on the backrest frame is rotatably connected to an extension mounting frame of the seat frame, so that the backrest frame rotates relative to the seat frame around a rotation connection point between the push rod and the extension mounting frame, thereby improving the stability of the rotation adjustment of the backrest frame. In addition, due to the limitation of the rotating connector, during the rotation adjustment of the backrest frame, the push rod performs a telescopic movement, and the length of the telescopic adjustment push rod and the shape of the rotational adjustment rotating connector are adjusted to adjust the relative distance between the backrest frame and the extension mounting frame, so that the backrest frame can fit the user's back, thereby reducing the relative movement distance between the backrest frame and the user's back, reducing the back rubbing feeling, and improving the user's experience.

[0027] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0028] In some embodiments, reference Figure 1 The anti-rubbing back rotation device 100 includes a backrest frame 200, a seat frame 300 and a rotation connection member 400. One end of the rotation connection member 400 is connected to the backrest frame 200, and the other end is connected to the seat frame 300. The backrest frame 200 is rotationally connected to the seat frame 300 through the rotation connection member 400, so that the backrest frame 200 can be rotated relative to the seat frame 300 to achieve the purpose of adjusting the backrest inclination angle. The backrest frame 200 is provided with a retractable push rod 500, and the seat frame 300 is provided with an extension mounting frame 600. The push rod 500 is rotationally connected to the extension mounting frame 600, so that the backrest frame 200 can be rotated relative to the seat frame 300 around the rotation connection point between the push rod 500 and the extension mounting frame 600, thereby improving the stability of the rotation of the backrest frame 200. During the process of rotating and adjusting the backrest, the retractable push rod 500 cooperates with the rotating connection 400 to telescopically adjust the length of the push rod 500 and rotationally adjust the shape of the rotating connection 400, thereby adjusting the relative distance between the backrest frame 200 and the extended mounting frame 600, so that the backrest frame 200 can fit the user's back during the rotation adjustment process, reducing the relative movement distance between the backrest frame 200 and the user's back, reducing the back-rubbing feeling, and improving the user experience.

[0029] In some embodiments, reference Figure 1 and Figure 2The rotating connecting part 400 of the anti-rub back rotating device 100 includes a rocker arm 410, a first connecting rod 420 and a seat frame fixing block 430. One end of the rocker arm 410 is hinged to one end of the first connecting rod 420, and the other end of the first connecting rod 420 is rotatably connected to the seat frame fixing block 430. The other end of the rocker arm 410 is rotatably connected to a slider 440. The seat frame fixing block 430 is arranged on the seat frame 300, and the slider 440 is arranged on the backrest frame 200. The rocker 410 can rotate relative to the first connecting rod 420 or the backrest frame 200, and the first connecting rod 420 can rotate relative to the rocker 410 or the seat frame fixing block 430 or the seat frame 300. By rotating and adjusting the rocker 410 and the first connecting rod 420, the shape of the rotating connecting member 400 is changed, so that the backrest frame 200 can adjust the relative distance with the seat frame 300 through the rotating connecting member 400 in cooperation with the retractable push rod 500, so that in the process of rotating and adjusting the backrest inclination angle, the backrest frame 200 can fit the back of the user, reducing the backrest frame. 200 can move relative to the user's back. Therefore, by rotating the adjusting rocker 410 and the first connecting rod 420 to change the shape of the rotating connecting piece 400, and telescopically adjusting the length of the push rod 500, the backrest frame 200 can adjust the relative distance with the extending mounting frame 600 through the rotating connecting piece 400 and the telescopic push rod 500, so that the backrest frame 200 can fit the user's back during the rotation of the backrest, reducing the relative movement of the backrest frame 200 and the user's back, reducing the back-rubbing feeling, and improving the user's experience.

[0030] In some embodiments, reference Figure 1 and Figure 2The rotating connecting member 400 includes a rocker 410, a first connecting rod 420, a second connecting rod 450, a seat frame fixing block 430, a backrest frame fixing block 460 and a slider 440. One end of the rocker 410 is hinged to one end of the first connecting rod 420, and the other end of the rocker 410 is rotatably connected to the slider 440. The slider 440 is arranged on the backrest frame 200. The other end of the first connecting rod 420 is rotatably connected to the seat frame fixing block 430. The seat frame fixing block 430 is arranged on the seat frame 300. One end of the second connecting rod 450 is hinged to the first connecting rod 420, and the other end of the second connecting rod 450 is rotatably connected to the backrest frame fixing block 460. The rocker 410 and the first connecting rod 420 are rotated to change the shape of the rotating connecting member 400, so that the relative distance between the backrest frame 200 and the extension mounting frame 600 can be adjusted, so that the backrest frame 200 can fit the user's back. The second connecting rod 450 is hinged with the first connecting rod 420 to limit the rotation trajectory of the first connecting rod 420, thereby limiting the rotation of the rotating connecting member 400, thereby limiting the rotation of the backrest frame 200, thereby improving the smoothness and stability of the rotation of the backrest frame 200 relative to the seat frame 300, so that the backrest frame 200 can fit the user's back during the process of rotating and adjusting the backrest, reducing the relative movement distance between the backrest frame 200 and the user's back, reducing the feeling of back rubbing, improving the comfort level, and improving the user experience.

[0031] In some embodiments, one end of the rocker 410 is hinged to one end of the first link 420, the other end of the rocker 410 is rotatably connected to the slider 440, the slider 440 is disposed on the backrest frame 200, and the other end of the first link 420 is rotatably connected to the seat frame fixing block 430, the seat frame fixing block 430 is disposed on the seat frame 300. The backrest frame 200 is provided with a retractable push rod 500, the seat frame 300 is provided with an extension mounting frame 600, the push rod 500 is rotatably connected to the extension mounting frame 600, so that the backrest frame 200 can rotate relative to the seat frame 300 around the rotation connection point between the push rod 500 and the extension mounting frame 600. The distance from the connection point between the push rod 500 and the extended mounting frame 600 to the back frame 200 is determined by the length of the rocker arm 410. When the length of the first connecting rod 420 remains unchanged, the distance between the back frame 200 and the connection point between the push rod 500 and the extended mounting frame 600 will increase accordingly by increasing the length of the rocker arm 410; the distance between the back frame 200 and the connection point between the push rod 500 and the extended mounting frame 600 will decrease accordingly by shortening the length of the rocker arm 410. Therefore, by adjusting the length of the rocker arm 410, the distance between the back frame 200 and the extended mounting frame 600 can be adjusted, so that the relative position of the back frame 200 and the user's back can be adjusted, and the relative movement distance between the back frame 200 and the user's back can be reduced, thereby reducing the back-rubbing feeling and improving the user's experience.

[0032] In some embodiments, the rocker 410 is provided with a plurality of circular holes, and the first connecting rod 420 is provided with a plurality of bosses, and the rocker 410 and the first connecting rod 420 are hinged by the cooperation of the circular holes and the bosses. The rocker 410 is provided with circular holes at different positions, and the bosses are connected with the circular holes at different positions to adjust the length of the rocker 410. Therefore, by coordinating the bosses and circular holes at different positions, the length of the rocker 410 can be adjusted, so as to facilitate the adjustment of the length, eliminate the step of replacing the rocker 410 of other lengths, and improve the user experience.

[0033] In some embodiments, the retractable push rod 500 is rotatably connected to the extension mounting frame 600, and the backrest frame 200 can rotate around the connection point between the push rod 500 and the extension mounting frame 600; one end of the first connecting rod 420 is hinged to one end of the rocker 410, and the other end of the first connecting rod 420 is rotatably connected to the seat frame fixing block 430, so that the first connecting rod 420 can rotate relative to the seat frame fixing block 430, and the other end of the rocker 410 is connected to the backrest frame 200 through the slider 440, so that the rocker 410 can rotate relative to the backrest frame 200. Therefore, the backrest frame 200 will drive the rocker 410 to rotate during the rotation adjustment process. Since the first connecting rod 420 is hinged to the rocker 410, the rocker 410 is driven by the backrest frame 200 to rotate, and the first connecting rod 420 is also driven to rotate while the rocker 410 is driven by the backrest frame 200 to rotate. Since the backrest frame 200 rotates around the connection point between the push rod 500 and the extension mounting frame 600, the rocker 410 is driven to rotate, and the rocker 410 as a whole rotates around the connection point between the push rod 500 and the extension mounting frame 600. Under the restriction of the first connecting rod 420, the rotation axis of the hinge between the rocker 410 and the first connecting rod 420, that is, the rotation center of the first connecting rod 420, is the rotation connection point between the first connecting rod 420 and the seat frame fixing block 430. Therefore, the rotation of the rocker 410 will be restricted by the first connecting rod 420, and the rotation of the backrest frame 200 will be restricted by the rocker 410, so that the backrest frame 200 is restricted by the rocker 410 and the first connecting rod 420. The stability of the rotation is improved, so that the backrest frame 200 can fit the user's back during the rotation process, reduce the relative movement of the backrest frame 200 and the user's back, and improve the user's experience.

[0034] In some embodiments, the anti-rubbing back rotation device 100 also includes a driving device for driving the backrest frame 200 to rotate. One end of the rotating connector 400 is rotatably connected to the backrest frame 200, and the other end is rotatably connected to the seat frame 300. The backrest frame 200 is provided with a retractable push rod 500, and the seat frame 300 is provided with an extension mounting frame 600. The push rod 500 is rotatably connected to the extension mounting frame 600, so that the backrest frame 200 can rotate relative to the seat frame 300 around the rotation connection point between the push rod 500 and the extension mounting frame 600, and the driving device can drive the backrest frame 200 to rotate relative to the seat frame 300. The driving device includes a gas spring, and the gas spring is provided on the backrest frame 200. The gas spring is driven to rotate and adjust the backrest position; the driving device may also include a motor, and the motor drives the backrest to rotate through a transmission device. The driving device is used to drive the backrest frame 200 to rotate, which is convenient for users to adjust the anti-rubbing back rotation device 100 and improve the user experience.

[0035] In some embodiments, the anti-rub back rotation device 100 also includes a motor, which can be arranged in the push rod 500. The motor can drive the push rod 500 to perform telescopic movement and adjust the length of the push rod 500, thereby driving the back frame 200 to rotate relative to the seat frame 300, or automatically adjusting the relative angle between the back frame 200 and the seat frame 300 through the motor, which is convenient for users to use and improves the user experience.

[0036] In some embodiments, the anti-rub back rotation device 100 also includes a locking device, which is arranged in the push rod 500. The locking device can be a clamp with an anti-slip sponge. When the locking device is in an unlocked state, the clamp is loosened and does not contact the push rod 500, does not limit the movement of the push rod 500, and can adjust the length of the push rod 500 by telescopic adjustment. When the locking device is in a locked state, the clamp clamps the push rod 500, limits the movement of the push rod 500, and fixes the length of the push rod 500, so that the length of the push rod 500 can be adjusted and fixed, thereby adjusting the relative distance between the backrest frame 200 and the extended mounting frame 300. During the rotation and adjustment of the anti-rub back rotation device 100, the backrest frame 200 fits the user's back, thereby improving the user's comfort.

[0037] It should be noted that the locking device can also be a gear locking member. A gear that cooperates with the gear locking member is provided on the push rod 500. The length of the push rod 500 is adjusted by rotating the adjusting gear. When the locking device is in the unlocked state, the gear locking member can cooperate with the gear on the push rod 500 to rotate and adjust the length of the push rod 500; when the locking device is in the locked state, the gear locking member is locked and rotated, and the gear on the push rod 500 cannot be rotated and adjusted, thereby fixing the length of the push rod 500, thereby adjusting and fixing the length of the push rod 500, and then adjusting the relative distance between the backrest frame 200 and the extending mounting frame 300, so that the backrest frame 200 fits the user's back, thereby improving the user's comfort.

[0038] In some embodiments, a buffer element for buffering and shock absorption is provided in the retractable push rod 500, such as a spring or rubber or a combination of a spring and rubber. By providing elastic materials such as springs and rubber in the push rod 500, a buffering and shock absorption function can be provided during the telescopic movement of the push rod 500. Therefore, when adjusting the backrest frame 200, the telescopic speed of the push rod 500 is slowed down, thereby improving the smoothness of the backrest adjustment and the comfort of the backrest, thereby improving the user experience.

[0039] In addition, another embodiment of the present invention further provides a chair, which includes the anti-rub back rotation device 100 in any of the above embodiments.

[0040] The chair of this embodiment includes the anti-rubbing back rotation device 100 as in the above embodiment, and the rotation connection member 400 is respectively connected to the back frame 200 and the seat frame 300 of the chair, so that the back frame 200 of the chair can be rotated relative to the seat frame 300 through the rotation connection member 400. The retractable push rod 500 provided on the back frame 200 is rotationally connected to the extended mounting frame 600 of the seat frame 300 of the chair, so that the back frame 200 of the chair rotates relative to the seat frame 300 around the rotation connection point between the push rod 500 and the extended mounting frame 600, thereby improving the stability of the rotation adjustment of the back frame 200. And due to the limitation of the rotating connection 400, during the rotation adjustment of the chair back frame 200, the push rod 500 performs a telescopic movement. The length of the telescopic adjustment push rod 500 and the rotation adjustment shape of the rotating connection 400 are used to adjust the relative distance between the back frame 200 and the extended mounting frame 600, so that the chair back frame 200 can fit the user's back, thereby reducing the relative movement range of the chair back frame 200 and the user's back, reducing the back rubbing feeling, and improving the user experience.

[0041] Since the chair in this embodiment and the anti-rub back rotating device in the above embodiment belong to the same inventive concept, other specific implementations of the chair in this embodiment can refer to the specific embodiments of the anti-rub back rotating device in the above embodiment. To avoid redundancy, other specific implementations of the chair in this embodiment will not be described here.

[0042] In addition, another embodiment of the present invention further provides a bed, which includes the anti-back rubbing rotation device 100 as in any of the above embodiments.

[0043] The bed of this embodiment includes the anti-back rubbing rotating device 100 as in the above embodiment, one end of the rotating connecting member 400 is connected to the backrest frame 200 of the bed, and the other end is connected to the seat frame 300 of the bed. Under the restriction of the rotating connecting member 400, the backrest frame 200 of the bed can rotate relative to the seat frame 300 of the bed around the rotating connection point of the push rod 500 and the extension mounting frame 600, thereby improving the stability of the rotation of the backrest frame 200. The shape of the rotating connecting member 400 is rotated and adjusted, and the length of the push rod 500 is telescopically adjusted to adjust the relative distance and position of the backrest frame 200 and the extension mounting frame 600, so that in the process of rotating and adjusting the backrest frame 200, the backrest frame 200 of the bed fits the back of the user, reducing the relative movement of the backrest frame 200 of the bed and the back of the user, reducing the back rubbing feeling, and improving the user experience.

[0044] Since the bed in this embodiment and the anti-back rub rotating device in the above-mentioned embodiment belong to the same inventive concept, other specific implementations of the bed in this embodiment can refer to the specific embodiments of the anti-back rub rotating device in the above-mentioned embodiment. To avoid redundancy, other specific implementations of the bed in this embodiment will not be described here.

[0045] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An anti-rubbing back rotation device, characterized in that: include: A backrest frame, a seat frame and a rotating connecting piece, one end of the rotating connecting piece is connected to the backrest frame, and the other end is connected to the seat frame, the seat frame is provided with an extending mounting frame, and the backrest frame is provided with a retractable push rod, the push rod is rotatably connected to the extending mounting frame, and the backrest frame can rotate relative to the seat frame around the connection point between the push rod and the extending mounting frame; the rotating connecting piece includes a rocker, a first connecting rod, a slider and a seat frame fixing block, one end of the rocker is hinged to one end of the first connecting rod, the other end of the first connecting rod is rotatably connected to the seat frame fixing block, the other end of the rocker is rotatably connected to the slider, the slider is provided on the backrest frame, The seat frame fixing block is arranged on the seat frame; the rotating connecting member also includes a second connecting rod and a backrest frame fixing block, the second connecting rod is hinged with the first connecting rod, the second connecting rod is rotatably connected with the backrest frame fixing block, and the backrest frame fixing block is arranged on the backrest frame; the distance from the connection point between the push rod and the protruding mounting frame to the backrest frame is determined by the length of the rocker arm, wherein, when the length of the first connecting rod is fixed, the distance of the backrest frame relative to the connection point between the push rod and the protruding mounting frame increases as the length of the rocker arm increases, and the distance of the backrest frame relative to the connection point between the push rod and the protruding mounting frame decreases as the length of the rocker arm shortens.

2. The anti-rubbing back rotation device according to claim 1, characterized in that: The anti-rubbing backrest rotation device also includes a driving device for driving the backrest frame to rotate relative to the seat frame around the connection point between the push rod and the extending mounting frame.

3. The anti-rubbing back rotation device according to claim 2, characterized in that: The driving device comprises a motor for driving the push rod to extend and retract, and the motor is arranged inside the push rod.

4. The anti-rubbing back rotation device according to claim 2, characterized in that: The anti-rubbing back rotation device also includes a locking device for adjusting the length of the push rod, and the locking device is arranged in the push rod.

5. The anti-rubbing back rotation device according to claim 2, characterized in that: A buffer element for buffering and shock absorption is arranged inside the push rod.

6. A chair, characterized in that: It comprises the anti-rubbing back rotation device as described in any one of claims 1 to 5.

7. A bed, characterized in that: It comprises the anti-rubbing back rotation device as described in any one of claims 1 to 5.

Images