CN111436785A - folding chair - Google Patents

Abstract

The invention relates to a folding chair, comprising a seat surface and a folding chair frame. The folding chair frame includes left and right chair frames arranged symmetrically from left to right. The left and right folding mechanisms and the pulling part, the left and right folding mechanisms both include an upper pull rod and a pull down rod, the inner ends of the upper pull rods of the left and right folding mechanisms are respectively hinged with the two sides of the upper end of the pulling part, and the left and right folding mechanisms are hinged. The outer ends of the upper pull rod are hinged with the back rod units of the left and right chair frames respectively, the inner ends of the pull down rods of the left and right folding mechanisms are respectively hinged with both sides of the lower end of the lifting part, and the outer ends of the pull down rods of the left and right folding mechanisms are respectively connected with The back rod units of the left and right chair frames are slidably connected, and the up and down movement of the pulling part drives the left and right chair frames to be relatively close to a folded state or relatively far apart to form an unfolded state through the left and right folding mechanisms. The folding chair of the invention has the advantages of simple folding, stable structure, safety and reliability when unfolded for use.

Description

folding chair

technical field

The present invention relates to the field of chairs, in particular to a folding chair.

Background technique

Folding chairs are favored by people because of their light structure, stackable, easy to move and store. Although there are many types of existing folding chairs, most of them adopt a front-rear direction folding structure, which cannot be folded in the left-right direction and further reduce the space.

In order to solve the folding of the folding chair in the left and right direction, Chinese invention patent CN104856487B discloses a foldable chair frame. The left and right back bars of the chair frame are provided with a folding structure composed of a parallel four-bar parallel mechanism. The up and down movement of the middle linkage rod of the parallel four-bar parallel mechanism realizes the folding or unfolding of the chair frame in the left and right directions. Since all the motion pairs of the parallel four-bar parallel mechanism are rotating pairs formed by a hinged structure, the chair frame has the disadvantage of uncertain motion. A slight movement of the middle linkage rod will cause the seat frame to fold or unfold in the left and right directions. Such uncertain factors lead to poor stability of the seat frame when it is deployed and used, and it is easy to cause a collapse phenomenon due to excessive force or accidental touch by the occupant, thereby posing a safety hazard.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, and to provide a folding chair that is easy to fold and has a stable, safe and reliable structure when unfolded for use.

The object of the present invention is achieved through the following technical solutions:

A folding chair, comprising a seat surface and a folding chair frame, the folding chair frame includes left and right chair frames arranged symmetrically from left to right, the left and right chair frames both include a back bar unit, and the folding chair frame also includes left and right Symmetrically arranged left and right folding mechanisms and pulling parts, the left and right folding mechanisms both include a pull-up rod and a pull-down rod; Side hinged, the outer ends of the upper pull rods of the left and right folding mechanisms are hinged with the back rod units of the left and right chair frames, respectively, and the inner ends of the pulldown rods of the left and right folding mechanisms are respectively connected with the lifting part. The lower end is hinged on both sides, the outer ends of the pull-down rods of the left and right folding mechanisms are respectively slidably connected with the back rod units of the left and right chair frames, and the up and down movement of the lifting part is driven by the left and right folding mechanisms The left and right seat frames are relatively close to each other to be in a folded state or relatively far apart to be in an unfolded state.

Further, when the left and right chair frames are in the unfolded state, the upper pull rods of the left and right folding mechanisms are inclined rod structures with high outside and low inside, and the pull-down rods of the left and right folding mechanisms are high inside and low outside. The inclined rod structure, and the included angle between the upper pull rods of the left and right folding mechanisms is greater than the included angle between the lower pull rods of the left and right folding mechanisms.

Further, the inner ends of the upper pull rods of the left and right folding mechanisms and the hinge shafts on both sides of the upper end of the lifting part, and the inner ends of the lower rods of the left and right folding mechanisms and the two sides of the lower end of the lifting part. The hinge shafts are symmetrically arranged around the vertical centerline of the lifting portion, and the distance between the inner ends of the upper pull rods of the left and right folding mechanisms and the hinge shafts on both sides of the upper end of the lifting portion is wider than The distance between the inner ends of the pull-down rods of the left and right folding mechanisms and the hinge shafts on both sides of the lower end of the pull-up part.

Further, a grip hole is provided in the middle of the lifting portion, and an arc-shaped grip handle recessed toward the grip hole is provided at the upper end of the lifting portion.

Further, the back bar units of the left and right chair frames each include a back bar and a sliding bar fixedly connected to the lower back side of the back bar, and the outer ends of the upper pull bars of the left and right folding mechanisms are respectively connected with the corresponding back bar units. The upper end of the sliding rod is hinged, and the outer ends of the lowering rods of the left and right folding mechanisms are respectively slidingly connected with the lower part of the sliding rod of the corresponding back rod unit.

Further, the outer ends of the pull-down rods of the left and right folding mechanisms are hinged with a first sliding sleeve, and the first sliding sleeves are respectively sleeved and slidably connected to the lower part of the sliding rod of the corresponding back rod unit.

Further, the back bar units of the left and right chair frames also include upper and lower sliding bar fixing seats, and in the back bar units of each chair frame, the sliding bars are fixed by the upper and lower sliding bars. The seat is fixedly connected to the rear side of the lower part of the back bar.

Further, the left and right seat frames also include front legs, rear legs and a seat post, and the rear ends of the seat bars of the left and right seat frames are hinged with the lower ends of the back bars of the left and right seat frames, respectively. , the upper ends of the front legs and the rear legs of the left and right chair frames are close to each other and are hinged together by a hinge pin, respectively, and the lower ends of the front legs and the rear legs of the left and right seat frames are far away from each other The upper ends of the front legs of the left and right seat frames are respectively hinged with the front parts of the seat posts of the left and right seat frames, and the rear ends of the seat posts of the left and right seat frames are also hinged with a second sliding sleeve respectively. , the second sliding sleeves are respectively slidable on the upper parts of the rear legs of the left and right seat frames, and the upper parts of the rear legs of the left and right seat frames are also respectively provided with the second sliding sleeves The limit stop pin that is on the side and is matched with the stop.

Further, the left and right chair frames also include armrests, the rear ends of the armrests of the left and right chair frames are hinged with the middle and lower parts of the back rods of the left and right chair frames, respectively, and the left and right chair frames are hinged. The front end of the armrest is respectively provided with a gear plate, and each gear plate is provided with at least two limit grooves spaced along its front and rear directions and a chute connected with each limit groove. The front support of the left and right chair frames The hinge pins of the legs and the rear legs respectively penetrate into the chute on the corresponding gear plate and can move in the chute to be clamped into any limit slot.

Further, the left and right seat frames also include telescopic rods, and the lower ends of the telescopic rods of the left and right seat frames are hinged with the lower ends of the front legs of the left and right seat frames, respectively, and the left and right seat frames are hinged. The upper ends of the telescopic rods are respectively hinged with the front ends of the seat rods of the left and right seat frames; the folding seat frame also includes a first cross rod and a second cross rod that are arranged crosswise and hinged to each other, the first cross rod and the second cross rod The upper ends of the two cross rods are respectively hinged with the upper ends of the telescopic rods of the left and right chair frames, and the lower ends of the first cross rod and the second cross rod are respectively hinged with the lower ends of the telescopic rods of the left and right chair frames; the The seat surface is sleeved on the seat post and the back post of the left and right chair frames.

Compared with the prior art, the present invention has the following beneficial effects:

In the folding structure of the present invention, the outer ends of the left and right upper pull rods are hinged with the back rod units of the left and right seat frames, and the outer ends of the left and right lower rods are slidably connected with the back rod units of the left and right seat frames, thereby changing all the folding structures in the prior art. The movement pairs are all the disadvantages of uncertain movement when the pair is rotated. When the folding chair is in the unfolded state, the user can only start to store and fold the left and right seat frames after applying a certain force to lift the pulling part, thereby improving the folding chair. Stability during use ensures safety and reliability during use. At the same time, the sliding connection structure of the outer ends of the left and right pull-down rods also makes the folding and storage of the folding chair more convenient and reliable.

Description of drawings

FIG. 1 is a schematic diagram of a left front three-dimensional structure of a folding chair of the present invention.

FIG. 2 is a left front three-dimensional structural diagram of the folding chair frame according to the present invention.

FIG. 3 is a schematic view of the rear view of the folding chair frame of the present invention.

FIG. 4 is a schematic diagram of a right rear three-dimensional structure of the folding chair frame according to the present invention.

FIG. 5 is a left view structural schematic diagram of the folding chair frame in the present invention.

Detailed ways

The present invention will be further described in detail below with reference to the embodiments given in the accompanying drawings.

As shown in FIGS. 1 to 5 , a folding chair according to an embodiment of the present invention includes a seat surface 1 and a folding chair frame 2 . The folding chair frame 2 includes left and right chair frames 3 and 4 symmetrically arranged left and right. The right chair frames 3 and 4 both include back bar units 31 and 41. The folding chair frame 2 also includes left and right folding mechanisms 5 and 6 and a pulling part 7 arranged symmetrically. The left and right folding mechanisms 5 and 6 both include upper The pull rods 51, 61 and the pull-down rods 52, 62, the inner ends of the pull-up rods 51, 61 of the left and right folding mechanisms 5, 6 are hinged with the two sides of the upper end of the pulling part 7, respectively, and the pull-up rods of the left and right folding mechanisms 5, 6 The outer ends of 51 and 61 are hinged with the back rod units 31 and 41 of the left and right chair frames 3 and 4 respectively, and the inner ends of the pull-down rods 52 and 62 of the left and right folding mechanisms 5 and 6 are respectively connected with the lower end of the pulling part 7 on both sides. Hinged, the outer ends of the pull-down rods 52 and 62 of the left and right folding mechanisms 5 and 6 are slidably connected with the back rod units 31 and 41 of the left and right chair frames 3 and 4 respectively. The right folding mechanisms 5 and 6 drive the left and right seat frames 3 and 4 to be relatively close to each other to be in a folded state or relatively far apart to be in an unfolded state.

In this embodiment, when the left and right chair frames 3 and 4 are in the unfolded state, the upper pull rods 51 and 61 of the left and right folding mechanisms 5 and 6 are inclined rod structures with high outer and inner low. The pull-down rods 52, 62 of 6 are inclined rod structures with high inside and outside, and the included angle a between the pull-up rods 51, 61 of the left and right folding mechanisms 5, 6 is larger than the pull-down rods of the left and right folding mechanisms 5, 6 Angle b between 52 and 62. And, preferably, the angle a between the upper pull rods 51 and 61 of the left and right folding mechanisms 5 and 6 is 1.5-1.8 of the angle b between the pull down rods 52 and 62 of the left and right folding mechanisms 5 and 6 times. Or specifically, the included angle a between the upper pull rods 51 and 61 of the left and right folding mechanisms 5 and 6 is 150-170 degrees, and the included angle b between the pull down rods 52 and 62 of the left and right folding mechanisms 5 and 6 80 to 110 degrees.

As mentioned above, when the folding chair is in the unfolded state, the upper pull rods 51 and 61 are inclined rod structures with high outside and low inside, which can effectively improve the stability of the folding chair when in use. Specifically, when the pulling part 7 is pulled up On the one hand, the pulling force must be greater than the resistance of the left and right chair frames 3 and 4 acting on the pulling part 7 through the corresponding upper pull rods 51 and 61; , the left and right chair frames 3 and 4 start to be stored and folded, so that the structure of the folding chair is firmer and more stable when the folding chair is unfolded.

In this embodiment, the inner ends of the upper pull rods 51 and 61 of the left and right folding mechanisms 5 and 6 and the hinge shafts 510 and 610 on both sides of the upper end of the pulling part 7 and the lower rods 52 and 62 of the left and right folding mechanisms 5 and 6 The hinge shafts 520, 620 at the inner end and the lower end of the pulling part 7 are symmetrically arranged around the vertical centerline of the pulling part 7, and the inner ends of the upper rods 51 and 61 of the left and right folding mechanisms The distance between the hinge shafts 510 and 610 on both sides of the upper end of the pulling part 7 is wider than the distance between the inner ends of the pull-down rods 52 and 62 of the left and right folding mechanisms 5 and 6 and the hinge shafts 520 and 620 on both sides of the lower end of the pulling part 7 . distance between.

In this embodiment, in order to facilitate the operation, a handle hole 71 is provided in the middle of the pulling part 7 , and an arc-shaped handle 72 concave toward the handle hole 71 is provided at the upper end of the pulling part 7 .

In this embodiment, the back bar units 31 and 41 of the left and right seat frames 3 and 4 both include back bars 311 and 411 and sliding bars 312 and 412 fixedly connected to the lower rear sides of the back bars 311 and 411. The outer ends of the upper pull rods 51 and 61 of the mechanisms 5 and 6 are hinged with the upper ends of the sliding rods 312 and 412 of the corresponding back rod units 31 and 41 respectively. The lower parts of the sliding rods 312 and 412 of the back rod units 31 and 41 are slidably connected.

Further, the outer ends of the pull-down rods 52 and 62 of the left and right folding mechanisms 5 and 6 are hingedly connected with a first sliding sleeve 521 and 621. The lower portion of the rods 312, 412 is slidably connected therewith.

Further, the back bar units 31 and 41 of the left and right seat frames 3 and 4 also include two upper and lower sliding bar fixing seats 800 and 900 , and the back bar units 31 and 41 of the respective seat frames 3 and 4 , the sliding rods 312 and 412 are fixedly connected to the lower rear side of the back rods 311 and 411 through the upper and lower sliding rod fixing seats 800 and 900 .

In this embodiment, the left and right seat frames 3 and 4 further include: front legs 32 and 42 , rear legs 33 and 43 and seat posts 34 and 44 . The rear ends of the seat rods 34 and 44 of the left and right seat frames 3 and 4 are hinged with the lower ends of the back rods 311 and 411 of the left and right seat frames 3 and 4 respectively. The front legs 32 and 42 of the left and right seat frames 3 and 4 and the upper ends of the rear legs 33 and 43 are close to each other and are hinged together by a hinge pin 300 and 400 respectively. The front legs 32 and 42 and the lower ends of the rear legs 33 and 43 of the left and right chair frames Away from the setting, the upper ends of the front legs 32 and 42 of the left and right seat frames 3 and 4 are hinged with the front parts of the seat posts 34 and 44 of the left and right seat frames 3 and 4 respectively. The rear ends of 34 and 44 are also hinged with a second sliding sleeve 341 and 441 respectively. The upper parts of the rear legs 33 and 43 of the chair frames 3 and 4 are respectively provided with limit stop pins 331 and 431 which are located on the upper side of the second sliding sleeves 341 and 441 and cooperate with them.

Further, the left and right chair frames 3 and 4 also include armrests 35 and 45. The rear ends of the armrests 35 and 45 of the left and right chair frames 3 and 4 are respectively connected with the back bars 311 and 411 of the left and right chair frames 3 and 4. The middle and lower parts are hinged, and the front ends of the armrests 35 and 45 of the left and right chair frames 3 and 4 are respectively provided with a gear plate 351 and 451. Position slots 3511, 4511 and chutes 3512, 4512 communicating with the limit slots 3511, 4511, hinge pins 300, 400 of the front legs 32, 42 and rear legs 33, 43 of the left and right seat frames 3, 4 It penetrates into the sliding grooves 3512 and 4512 on the corresponding gear plates 351 and 451 respectively and can move in the sliding grooves 3512 and 4512 to be locked into any limiting grooves 3511 and 4511 . When in use, the hinge pins 300, 400 are snapped into different limit slots 3511, 4511, which can change the inclination angle of the back rod units 31, 41 in the left and right chair frames 3, 4, so as to realize the adjustment of the backrest angle of the folding chair .

Further, the left and right chair frames 3 and 4 also include telescopic rods 36 and 46. The lower ends of the telescopic rods 36 and 46 of the left and right chair frames 3 and 4 are respectively connected with the front legs of the left and right chair frames 3 and 4. The lower ends of 32 and 42 are hinged, and the upper ends of the telescopic rods 36 and 46 of the left and right seat frames 3 and 4 are respectively hinged with the front ends of the seat rods 34 and 44 of the left and right seat frames 3 and 4; The first cross bar 8 and the second cross bar 9, the upper ends of the first cross bar 8 and the second cross bar 9 are hinged with the upper ends of the telescopic bars 36, 46 of the left and right seat frames 3, 4 respectively, and the first cross bar 8 and the lower ends of the second cross bar 9 are hinged with the lower ends of the telescopic bars 36 and 46 of the left and right seat frames 3 and 4 respectively; 311, 411 on.

As mentioned above, when the folding chair according to the present invention is folded, the user exerts a certain force to lift the pulling part 7 upward and overcome the pair of upper pull rods 51, 61 and pull down rods 52, 62 in the left and right folding mechanisms 5, 6 to pull up After the resistance of the part 7, the outer ends of the upper pull rods 51, 61 can be rotated toward the downward direction of the inner end, and the outer ends of the pull down rods 52, 62 can be slid upward along the sliding rods 312, 412, thereby driving the left and right chairs The racks 3, 4 are relatively close to achieve folding.

The above are only preferred embodiments of the present invention, and should not limit the scope of implementation of the present invention, that is, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the description of the invention are all It still falls within the scope covered by the patent of the present invention.

Claims (10)

1. The utility model provides a folding chair, includes seat and folding chair frame, left and right chair frame that folding chair frame set up including bilateral symmetry, left and right chair frame all includes back of the body pole unit, its characterized in that: the foldable chair frame further comprises a left folding mechanism, a right folding mechanism and a lifting part which are arranged in a bilateral symmetry mode, the left folding mechanism and the right folding mechanism respectively comprise an upper pull rod and a lower pull rod, the inner ends of the upper pull rods of the left folding mechanism and the right folding mechanism are respectively hinged with the two sides of the upper end of the lifting part, the outer ends of the upper pull rods of the left folding mechanism and the right folding mechanism are respectively hinged with back rod units of the left chair frame and the right chair frame, the inner ends of the lower pull rods of the left folding mechanism and the right folding mechanism are respectively hinged with the two sides of the lower end of the lifting part, the outer ends of the lower pull rods of the left folding mechanism and the right folding mechanism are respectively in sliding connection with the back rod units of the left chair frame and the right chair frame, and the upper portion and the lower portion of the lifting part move.

2. The folding chair as claimed in claim 1, wherein: when the left and right chair frames are in the unfolding state, the upper pull rods of the left and right folding mechanisms are of an inclined rod structure with a high outside and a low inside, the lower pull rods of the left and right folding mechanisms are of an inclined rod structure with a high inside and a low outside, and the included angle between the upper pull rods of the left and right folding mechanisms is larger than the included angle between the lower pull rods of the left and right folding mechanisms.

3. The folding chair as claimed in claim 1, wherein: the inner ends of the upper pull rods of the left folding mechanism and the right folding mechanism and the hinged shafts on two sides of the upper end of the lifting part as well as the inner ends of the lower pull rods of the left folding mechanism and the right folding mechanism and the hinged shafts on two sides of the lower end of the lifting part are symmetrically arranged by taking the vertical central line of the lifting part as a center, and the distance between the inner ends of the upper pull rods of the left folding mechanism and the right folding mechanism and the hinged shafts on two sides of the upper end of the lifting part is wider than the distance between the inner ends of the lower pull rods of the left folding mechanism and the right folding mechanism and the hinged shafts on.

4. The folding chair as claimed in claim 1, wherein: the middle of the lifting part is provided with a holding hole, and the upper end of the lifting part is provided with an arc-shaped grab handle which is concave to the holding hole.

5. A folding chair as claimed in claim 1, 2, 3 or 4, wherein: the back bar units of the left and right chair frames comprise back bars and sliding bars fixedly connected to the rear sides of the lower portions of the back bars, the outer ends of the upper pull rods of the left and right folding mechanisms are hinged to the upper ends of the sliding bars of the corresponding back bar units respectively, and the outer ends of the lower pull rods of the left and right folding mechanisms are connected with the lower portions of the sliding bars of the corresponding back bar units in a sliding mode.

6. The folding chair as claimed in claim 5, wherein: the outer ends of the lower pull rods of the left folding mechanism and the right folding mechanism are hinged with first sliding sleeves, and the first sliding sleeves are respectively sleeved in the lower parts of the sliding rods of the corresponding back rod units and are in sliding connection with the sliding rods.

7. The folding chair as claimed in claim 6, wherein: the back bar units of the left and right chair frames further comprise an upper slide bar fixing seat and a lower slide bar fixing seat, and in the back bar units of the chair frames, the slide bars are fixedly connected to the rear side of the lower part of the back bar through the upper slide bar fixing seat and the lower slide bar fixing seat.

8. The folding chair as claimed in claim 5, wherein: the left chair frame and the right chair frame respectively comprise a front supporting leg, a rear supporting leg and a seat post, the rear ends of the seat posts of the left chair frame and the right chair frame are hinged with the lower ends of the back posts of the left chair frame and the right chair frame respectively, the upper ends of the front supporting leg and the rear supporting leg of the left chair frame and the right chair frame are drawn close to each other and are hinged together through a hinge pin shaft respectively, the lower ends of the front supporting leg and the rear supporting leg of the left chair frame and the right chair frame are kept away from each other and are arranged, the upper ends of the front supporting leg of the left chair frame and the front supporting leg of the right chair frame are hinged with the front portions of the seat posts of the left chair frame and the right chair frame respectively, the rear ends of the seat posts of the left chair frame and the right chair frame are hinged with a second sliding sleeve respectively, the second sliding sleeves are sleeved on the upper portions of the rear supporting legs of the left chair frame and the right.

9. The folding chair as claimed in claim 8, wherein: the left and right chair frames further comprise handrails, the rear ends of the handrails of the left and right chair frames are respectively hinged to the middle lower parts of the back bars of the left and right chair frames, the front ends of the handrails of the left and right chair frames are respectively provided with a gear plate, at least two limiting grooves distributed along the front and back directions of the gear plate and sliding grooves communicated with the limiting grooves are arranged on each gear plate, the front supporting legs of the left and right chair frames and the hinged pin shafts of the rear supporting legs penetrate into the sliding grooves on the corresponding gear plates respectively and can move in the sliding grooves and are clamped into any limiting grooves.

10. The folding chair as claimed in claim 9, wherein: the left chair frame and the right chair frame respectively comprise telescopic rods, the lower ends of the telescopic rods of the left chair frame and the right chair frame are respectively hinged with the lower ends of the front support legs of the left chair frame and the right chair frame, and the upper ends of the telescopic rods of the left chair frame and the right chair frame are respectively hinged with the front ends of the seat rods of the left chair frame and the right chair frame; the folding chair frame further comprises a first cross rod and a second cross rod which are arranged in a crossed mode and hinged with each other, the upper ends of the first cross rod and the second cross rod are hinged with the upper ends of the telescopic rods of the left chair frame and the right chair frame respectively, and the lower ends of the first cross rod and the second cross rod are hinged with the lower ends of the telescopic rods of the left chair frame and the right chair frame respectively; the seat surface is sleeved on the seat rod and the back rod of the left and right chair frames.

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