Chair frame and chair

This is a National stage application, filed under 37 U.S.C. 371, of International Patent Application NO. PCT/CN2021/114117, filed on Aug. 23, 2021, which is based on and claims priority to Chinese Patent Application No. 202121058656.0 filed on May 18, 2021, the disclosure of which is incorporated herein by reference in its entirety.

The present disclosure relates to the technical field of furniture, for example, a chair frame and a chair.

A zero gravity chair, designed by combining the zero gravity principle with chair technologies, utilizes the ergonomic design of the chair and zero gravity technologies to make the horizontal line of an occupant's lower legs higher than the position of the occupant's heart so as to place the occupant in a natural state. This can resist the discomfort brought by the gravity of the earth, simultaneously place the center of gravity of the occupant's body on the occupant's hip fat and make other body parts free from pressure so as to relax the body.

However, at present, backrest opening angles of zero gravity chairs on the market are not large enough, and the comfort is low.

The present disclosure provides a chair frame that can increase an unfolded angle of a backrest, achieve the zero gravity effect and have higher comfort.

The present disclosure further provides a chair. The chair comfort can be improved by applying the preceding chair frame.

In an aspect, a chair frame is provided. The chair frame includes a seat cushion bracket, and a transmission assembly, a waist support assembly and a footstool assembly that are disposed on the seat cushion bracket.

The waist support assembly is pivotally connected to a first end of the transmission assembly and includes a waist support bracket and a waist support rod group, the waist support rod group includes a first support rod, a second support rod and a third support rod, a first end of the third support rod is pivotally connected to the seat cushion bracket, a second end of the third support rod is pivotally connected to the waist support bracket, a first end of the second support rod is connected to the transmission assembly, a second end of the second support rod is pivotally connected to a third end of the third support rod, a first end of the first support rod is pivotally connected to a third end of the second support rod, and a second end of the first support rod is pivotally connected to the waist support bracket.

The waist support assembly is configured such that when the waist support assembly is unfolded, driven by the second support rod, the second end of the first support rod is able to swing toward the footstool assembly with a junction between the first end of the first support rod and the second support rod as a rotation center.

The footstool assembly is pivotally connected to a second end of the transmission assembly, is further connected to an external driving apparatus and is configured to, driven by the external driving apparatus, be able to fold or unfold and drive the transmission assembly and the waist support assembly to fold or unfold.

In another aspect, a chair is provided and includes the preceding chair frame.

FIG. 1 is a view illustrating the structure when a chair frame is unfolded according to embodiments of the present disclosure.

FIG. 2 is a view illustrating the structure of a waist support rod group according to embodiments of the present disclosure.

FIG. 3 is a view illustrating the structure of a waist support connecting rod group according to embodiments of the present disclosure.

FIG. 4 is a view illustrating a connection relationship between a waist support connecting rod group and a seat cushion bracket taken from a viewing angle according to embodiments of the present disclosure.

FIG. 5 is a view illustrating a connection relationship between a waist support connecting rod group and a seat cushion bracket taken from another viewing angle according to embodiments of the present disclosure.

FIG. 6 is a view illustrating the structure when a chair frame is folded according to embodiments of the present disclosure.

FIG. 7 is a view illustrating the structure when a chair frame is unfolded according to an embodiment.

1 seat cushion bracket

2 transmission assembly

3 waist support assembly

31 waist support bracket

311 waist support segment

32 waist support rod group

321 first support rod

322 second support rod

323 third support rod

33 waist support transmission rod group

331 first transmission rod

332 second transmission rod

333 third transmission rod

34 waist support connecting rod group

341 first connecting rod

342 second connecting rod

343 third connecting rod

344 fourth connecting rod

345 fifth connecting rod

346 sixth connecting rod

347 seventh connecting rod

348 eighth connecting rod

349 ninth connecting rod

4 footstool assembly

41 first foot rod

42 second foot rod

43 third foot rod

431 middle footstool attachment platform

44 fourth foot rod

45 fifth foot rod

46 footstool bracket

461 footstool attachment platform

47 sixth foot rod

It is to be noted that similar reference numerals and letters indicate similar items in subsequent drawings. Therefore, once some item is defined in one drawing, the item needs no more definition and explanation in the subsequent drawings.

In the description of the present disclosure, it is to be noted that the orientational or positional relationships indicated by terms such as “above”, “below”, “left”, “right”, “vertical”, “horizontal”, “inside”, “outside” and the like are based on the orientational or positional relationships illustrated in the drawings or the orientational or positional relationship that products of the present disclosure are usually used in, which are for the mere purpose of facilitating and simplifying the description of the present disclosure and do not indicate or imply that the apparatus or element referred to has a specific orientation and is constructed and operated in a specific orientation, and thus it is not to be construed as limiting the present disclosure. Moreover, terms such as “first”, “second” and “third” are merely for distinguishing the descriptions and are not to be construed as indicating or implying relative importance. In the description of the present disclosure, unless otherwise noted, the term “a plurality of” or “multiple” refers to two or more.

In the description of the present disclosure, it is also to be noted that unless otherwise expressly specified and limited, the term “configured” or “connected” is to be construed in a broad sense, for example, as securely connected, detachably connected or internally connected; or mechanically connected or electrically connected. For those of ordinary skill in the art, specific meanings of the preceding terms in the present disclosure may be understood based on specific situations.

In the present disclosure, unless otherwise expressly specified and limited, when a first feature is described as “on” or “under” a second feature, the first feature and the second feature may be in direct contact or may be in indirect contact via another feature between the two features instead of being in direct contact. Moreover, when the first feature is described as “on”. “above”, or “over” the second feature, the first feature is right on, above, or over the second feature, the first feature is obliquely on, above, or over the second feature, or the first feature is simply at a higher level than the second feature. When the first feature is described as “under”. “below”, or “underneath” the second feature, the first feature is right under, below, or underneath the second feature, the first feature is obliquely under, below, or underneath the second feature, or the first feature is simply at a lower level than the second feature.

Embodiments of the present disclosure are described in detail below. Examples of the embodiments are illustrated in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are illustrative, only for explaining the present disclosure, and not to be construed as limiting the present disclosure.

As shown in FIGS. 1 to 6 , this embodiment provides a chair frame. The chair frame includes a seat cushion bracket 1 , and a transmission assembly 2 , a waist support assembly 3 and a footstool assembly 4 that are disposed on the seat cushion bracket 1 . The waist support assembly 3 is pivotally connected to a first end of the transmission assembly 2 . The footstool assembly 4 is pivotally connected to a second end of the transmission assembly 2 and is further connected to an external driving apparatus so as to enable the footstool assembly 4 , driven by the external driving apparatus, to be able to fold or unfold and drive the transmission assembly 2 and the waist support assembly 3 to fold or unfold. The waist support assembly 3 includes a waist support bracket 31 and a waist support rod group 32 . As shown in FIG. 2 and in conjunction with FIG. 1 , the waist support rod group 32 includes a first support rod 321 , a second support rod 322 and a third support rod 323 . A first end of the third support rod 323 is pivotally connected to the seat cushion bracket 1 , and a second end of the third support rod 323 is pivotally connected to the waist support bracket 31 . A first end of the second support rod 322 is connected to the transmission assembly 2 , and a second end of the second support rod 322 is pivotally connected to a third end of the third support rod 323 . A first end of the first support rod 321 is pivotally connected to a third end of the second support rod 322 , and a second end of the first support rod 321 is pivotally connected to the waist support bracket 31 . When the waist support assembly 3 is unfolded, driven by the second support rod 322 , the second end of the first support rod 321 can swing toward the footstool assembly 4 with a junction between the first end of the first support rod 321 and the second support rod 322 as a rotation center.

Optionally, an included angle between an upper end surface of the seat cushion bracket 1 and the horizontal plane ranges from 16° to 28°.

Optionally, the waist support bracket 31 includes a waist support segment 311 for supporting a waist, and an included angle between the waist support segment 311 and the upper end surface of the seat cushion bracket 1 ranges from 135° to 150° so that an unfolded angle of the waist support bracket 31 can be increased.

A human waist and back are supported by using the waist support assembly 3 , and human legs and feet are supported by using the footstool assembly 4 . Meanwhile, when the waist support assembly 3 is unfolded, driven by the second support rod 322 , the second end of the first support rod 321 can swing toward the footstool assembly 4 with the junction between the first end of the first support rod 321 and the second support rod 322 as the rotation center to increase the included angle between the waist support bracket 31 and the seat cushion bracket 1 , that is, increasing an unfolded angle of a backrest and achieving the zero gravity effect.

Optionally, the waist support assembly 3 further includes a waist support transmission rod group 33 and a waist support connecting rod group 34 that are each pivotally connected to the seat cushion bracket 1 , the waist support transmission rod group 33 is pivotally connected between the transmission assembly 2 and the waist support connecting rod group 34 , and the waist support connecting rod group 34 is pivotally connected between the waist support transmission rod group 33 and the waist support rod group 32 .

Optionally, the transmission assembly 2 is an adapter transmission rod. Two ends of the adapter transmission rod 2 are pivotally connected to the waist support transmission rod group 33 and the footstool assembly 4 respectively. The external driving apparatus directly drives the footstool assembly 4 to act, then transmits a driving force through the adapter transmission rod 2 and drives the waist support transmission rod group 33 to drive the linkage of the waist support connecting rod group 34 and the waist support rod group 32 .

Optionally, referring to FIGS. 1 and 4 , the waist support transmission rod group 33 includes a first transmission rod 331 , a second transmission rod 332 and a third transmission rod 333 . The first transmission rod 331 is pivotally connected to a first end of the adapter transmission rod 2 .

A first end of the second transmission rod 332 is pivotally connected to a first end of the first transmission rod 331 , and a second end of the second transmission rod 332 is pivotally connected to the seat cushion bracket 1 . A first end of the third transmission rod 333 is pivotally connected to a second end of the first transmission rod 331 , and a second end of the third transmission rod 333 is pivotally connected to the seat cushion bracket 1 .

Optionally, as shown in FIGS. 3 to 5 and in conjunction with FIG. 1 , the waist support connecting rod group 34 includes a first connecting rod 341 , a second connecting rod 342 , a third connecting rod 343 , a fourth connecting rod 344 , a fifth connecting rod 345 , a sixth connecting rod 346 , a seventh connecting rod 347 and an eight connecting rod 348 . A first end of the first connecting rod 341 is pivotally connected to the second support rod 322 . A first end of the second connecting rod 342 is pivotally connected to a second end of the first connecting rod 341 . A first end of the third connecting rod 343 is pivotally connected to a second end of the second connecting rod 342 . A first end of the fourth connecting rod 344 is pivotally connected to the middle of the third connecting rod 343 , and a second end of the fourth connecting rod 344 is pivotally connected to the first transmission rod 331 . A first end of the fifth connecting rod 345 is pivotally connected to a second end of the third connecting rod 343 . A first end of the sixth connecting rod 346 is pivotally connected to a second end of the fifth connecting rod 345 , and a second end of the sixth connecting rod 346 is pivotally connected to the middle of the second connecting rod 342 . A first end of the seventh connecting rod 347 is pivotally connected to the first transmission rod 331 , and a second end of the seventh connecting rod 347 is pivotally connected to the middle of the sixth connecting rod 346 . A first end of the eighth connecting rod 348 is pivotally connected to the middle of the seventh connecting rod 347 , and a second end of the eighth connecting rod 348 is pivotally connected to the middle of the fifth connecting rod 345 . The seventh connecting rod 347 is a cross-shaped structure. The eighth connecting rod 348 is connected to a third end of the cross-shaped structure of the seventh connecting rod 347 .

Optionally, the footstool assembly 4 includes a first foot rod 41 , a second foot rod 42 , a third foot rod 43 , a fourth foot rod 44 , a fifth foot rod 45 , a footstool bracket 6 and a sixth foot rod 47 . A first end of the first foot rod 41 is pivotally connected to the seat cushion bracket 1 and a second end of the adapter transmission rod 2 . A first end of the second foot rod 42 is pivotally connected to a second end of the first foot rod 41 . A first end of the third foot rod 43 is pivotally connected to a second end of the second foot rod 42 . A first end of the fourth foot rod 44 is pivotally connected to a second end of the third foot rod 43 . A first end of the fifth foot rod 45 is pivotally connected to a second end of the fourth foot rod 44 , and a second end of the fifth foot end 45 is pivotally connected to the seat cushion bracket 1 , and the fifth foot rod 45 is securely connected to the external driving apparatus through an adapter. A first end of the footstool bracket 46 is pivotally connected to the third foot rod 43 , and a second end of the footstool bracket 46 is provided with a footstool attachment platform 461 configured to attach a footstool. A first end of the sixth foot rod 47 is pivotally connected to the fourth foot rod 44 , and a second end of the sixth foot rod 47 is pivotally connected to the footstool bracket 46 .

Optionally, a middle footstool attachment platform 431 is disposed on the third foot rod 43 and is configured to attach a middle footstool.

In an embodiment, as shown in FIG. 7 , the adapter transmission rod 2 may also be strip-shaped, and the shape of the third transmission rod 333 is curved. In this case, the first end of the third transmission rod 333 is pivotally connected to the second end of the first transmission rod 331 , the second end of the third transmission rod 333 is pivotally connected to the seat cushion bracket 1 , and a third end of the third transmission rod 333 is pivotally connected to the first end of the adapter transmission rod 2 . Moreover, the waist support connecting rod group 34 further includes a ninth connecting rod 349 . A first end of the ninth connecting rod 349 is pivotally connected to the second end of the first connecting rod 341 , and a second end of the ninth connecting rod 349 is pivotally connected to the first end of the second connecting rod 342 , that is, the first connecting rod 341 and the second connecting rod 342 are pivotally connected through the ninth connecting rod 349 . The rest of the structures and their connection relationships remain the same, and reference may be made to FIGS. 1 to 6 and the preceding related description.

This embodiment further provides a chair including the preceding chair frame. The chair comfort can be improved by applying the preceding chair frame.