CN212325905U - Chair back folding mechanism and seat - Google Patents

Abstract

The utility model discloses a chair back folding mechanism and a piece of seating furniture, which comprises a back frame, a handrail frame and a rotating device, wherein the back frame and the handrail frame are in rotatable fit through the rotating device, the back frame has a folding state and a use state, and the back frame overturns forwards in the folding state; when in use, the back frame is in a backward inclined state; the rotating device comprises a rotating shaft and a shaft hole, the rotating shaft is arranged on one of the handrail frame or the back frame, and the shaft hole is arranged on the other of the back frame or the handrail frame; the shaft hole is provided with a limiting hole position for limiting the rotation of the rotating shaft and a movable hole position for enabling the rotating shaft to freely rotate, and when the rotating shaft is located at the limiting hole position, the back frame is in a use state; when the pivot was in the activity hole site, the back of the body frame can be by the user state forward upset to fold condition, through establishing different hole sites on the shaft hole and pivot cooperation, makes the back of the body frame change fast between fold condition and user state, simple structure, and the installation is quick and save the cost.

Description

Chair back folding mechanism and seat

Technical Field

The utility model relates to a seat field, in particular to back of chair folding mechanism and thing to sit on.

Background

People are in the open air amusement and recreation, the leisure chaise longue is often used, the leisure chaise longue is more comfortable in order to let people use, it is comparatively spacious that generally all do, so the volume is great, it is just not very convenient to carry, and it is contradictory that this and people hope can conveniently carry the leisure chaise longue to go out, so someone has designed the leisure chaise longue that can fold, but present folding leisure chaise longue or the volume after folding is still great, or just realize folding through setting up complicated loaded down with trivial details beta structure, but this kind of seat structure often need dismantle the leisure chaise longue when the transportation then install by oneself again, exist not enoughly in the aspect of convenience and the travelling comfort of often using.

CN200620141819.0, a chinese utility model patent discloses a "folding leisure chair", which comprises a seat frame, a backrest frame, a footrest frame, a front leg frame, a rear leg frame and two side handrail cross bars; the front end of the seat frame is respectively and rotatably movably connected with the middle part of the leg rest frame, and the rear end of the seat frame is respectively and rotatably movably connected with the lower end of the chair back frame; the front end of the handrail cross bar is rotatably and movably connected with the upper ends of the side bars of the foot rest frame, and the rear end of the handrail cross bar is rotatably and movably connected with the middle parts of the side bars of the chair back frame; the upper ends of the two side rods of the front foot frame are respectively in rotary loose joint with the upper ends of the two side rods of the rear foot frame, and the upper ends of the side rods of the front foot frame or the upper ends of the side rods of the rear foot frame are also in rotary loose joint with a handrail mounting seat with a central through hole; the middle parts of two side rods of the back foot frame are respectively in rotary loose joint with the lower end of an L-shaped connecting piece, the top point of the L-shaped connecting piece is positioned behind the side rod of the back foot frame and is in rotary loose joint with the middle part of the side rod of the seat frame, the other end of the L-shaped connecting piece extends forwards to be in rotary loose joint with a connecting rod, and the other end of the connecting rod is in rotary loose joint with the middle part of the side rod of the front foot frame. Has the advantages of reasonable structure, smooth folding and opening actions, comfortable sitting feeling and the like. Although the folding of seat can be realized to this leisure seat, the structure is too loaded down with trivial details between the seat subassembly, and the rotation between the subassembly is realized to the loose joint and connecting piece in many places, need assemble by oneself again after every subassembly dismantlement during transportation installation, and the convenience exists not enoughly, and the structure damages easily.

Disclosure of Invention

The utility model overcomes the defects in the prior art, and provides a chair back folding mechanism, which can be rotationally matched between a back frame and a handrail frame through a rotating device, wherein the rotating device comprises a rotating shaft and a shaft hole, and the back frame is in a corresponding folding state or a using state through arranging a limiting hole site for limiting the rotation of the rotating shaft and a movable hole site for enabling the rotating shaft to freely rotate at the shaft hole and enabling the back frame to be in a corresponding folding state or a using state through enabling the shaft hole to be in different hole sites, so that the back frame can be quickly and conveniently folded; still further, the utility model also provides a seat equipped with the chair back folding mechanism.

The technical scheme of the utility model is realized like this:

a chair back folding mechanism comprises a back frame, a handrail frame and a rotating device, wherein the back frame is in rotatable fit with the handrail frame through the rotating device, the back frame is in a folding state and a using state, and the back frame is forwards turned when in the folding state; when in use, the back frame is in a backward inclined state; the rotating device comprises a rotating shaft and a shaft hole, the rotating shaft is arranged on one of the handrail frame or the back frame, and the shaft hole is arranged on the other of the back frame or the handrail frame; the shaft hole is provided with a limiting hole position for limiting the rotation of the rotating shaft and a movable hole position for enabling the rotating shaft to freely rotate, and when the rotating shaft is located at the limiting hole position, the back frame is in a use state; when the rotating shaft is in the movable hole position, the back frame can be forwards turned to a folded state from a use state. Through establishing different hole sites and the pivot cooperation in the shaft hole, make back of the body frame change fast between fold condition and user state, simple structure, the installation is quick and save the cost.

Preferably, the shaft hole is arranged on the handrail frame, the rotating shaft and the shaft hole are matched and then penetrate through the shaft hole, the limiting hole is a U-shaped hole, and corresponding notches are arranged on two sides of the rotating shaft and are in clamping fit with the U-shaped hole. The rotation limitation of the rotating shaft is realized through a clamping connection mode, and the device is ingenious in design and obvious in effect.

Preferably, the movable hole is located above the limiting hole, and the size of the movable hole is set to enable the rotating shaft to rotate freely. The movable hole site and the limiting hole site are located in the same upper and lower adjacent hole sites, and the height of the rotating shaft is adjusted without plugging.

Preferably, a first torsion spring is arranged between the rotating shaft and the armrest frame, one end of the first torsion spring is fixed relative to the armrest frame, and the other end of the first torsion spring acts on the rotating shaft, so that the rotating shaft is kept clamped in the trend of the limiting hole position. The first torsion spring provides a return spring force for the shaft when the shaft is in the active hole position.

Preferably, the rotating shaft head is provided with a limiting plate, the limiting plate is connected to the rotating shaft through a mounting screw, and one end of the first torsion spring abuts between the limiting plate and the mounting screw.

Preferably, the rotating device further comprises a sleeve and connecting vertical plates arranged at intervals, the connecting vertical plates are fixedly connected with the back frame, the sleeve is sleeved with the rotating shaft and then penetrates through the connecting vertical plates, and the connecting vertical plates are in running fit with the rotating shaft through the sleeve.

Preferably, the foldable chair further comprises a second torsion spring, one end of the second torsion spring is fixed relative to the rotating shaft, and the other end of the second torsion spring acts on the back frame to provide reset elastic force for the back frame when the back frame is inclined in a use state. The second torsion spring is arranged, so that the reset elastic force is provided when the back frame rotates, and the use comfort is improved.

Preferably, the rotating shaft is provided with a longitudinal baffle, and a limiting mechanism is arranged between the longitudinal baffle and the connecting vertical plate. The limiting mechanism can limit the rotation angle of the back frame.

Preferably, the limiting mechanism comprises a limiting pin and a limiting groove, the limiting pin is arranged on the longitudinal baffle, and the limiting groove is correspondingly arranged on the connecting vertical plate. Through setting up spacer pin and spacing groove, simple structure just can restrict the back of the body frame and rotate at certain angle within range when using.

Preferably, a baffle is connected to the tail of the rotating shaft and used for limiting the sleeve to be separated from the rotating shaft. The baffle can restrict the sleeve pipe in the horizontal direction's removal, makes the mechanism use more stably.

A piece of seating furniture comprising a chair back folding mechanism as described above.

Adopted above-mentioned technical scheme the utility model discloses a design departure point, theory and beneficial effect are:

the utility model provides a chair back folding mechanism, compared with the prior art, the chair back folding mechanism is provided with different limiting hole sites and movable hole sites on the shaft hole of a rotating device, when the shaft hole is at different hole sites, the back frame is in a corresponding use state or a folding state; the back frame can be folded or used quickly and conveniently by rapidly adjusting the rotating shaft to be matched with different hole positions without disassembly, so that the volume of transportation and packaging is reduced, and the transportation cost is reduced; can fold back of the body frame as required fast, in addition, but back of the chair beta structure's installation or dismantlement mode are comparatively simple.

Drawings

Fig. 1 is a schematic perspective view of a chair back folding mechanism according to an embodiment of the present invention;

fig. 2 is a schematic view of the connection three-dimensional structure of the rotating device, the back frame and the handrail frame in the embodiment of the present invention;

fig. 3 is a schematic perspective view of the seat back folding mechanism in the embodiment of the present invention, which is located on the seat and in the use state;

fig. 4 is a schematic perspective view of a rotating device in an embodiment of the present invention when the folding structure of the chair back is in use;

fig. 5 is a schematic perspective view of the folding mechanism of the back of the chair in the folded state on the seat according to the embodiment of the present invention;

fig. 6 is a schematic perspective view of the rotating device in the folded state of the chair back folding mechanism according to the embodiment of the present invention;

fig. 7 is a schematic perspective view of the chair back folding mechanism at another angle in the use state according to the embodiment of the present invention;

fig. 8 is a schematic perspective view of the embodiment of the present invention, in which the rotation shaft is located at the restriction hole;

fig. 9 is a schematic perspective view of another embodiment of the folding mechanism of the back of the chair in a folded position on the seat;

fig. 10 is a schematic perspective view of the embodiment of the present invention, in which the rotating shaft is located at the movable hole.

Fig. 11 is a schematic perspective view of an armrest frame shaft hole according to an embodiment of the present invention.

Fig. 12 is a schematic perspective view of a rotating shaft according to an embodiment of the present invention.

The figures are numbered: a back frame 1; a handrail frame 2; a rotating device 3; a rotating shaft 4; a limit table 41; the cut-outs 42; a shaft hole 5; a restriction hole site 6; a movable hole position 7; a limiting plate 8; mounting screws 9; a first torsion spring 10; a tension arm 102; a jack 11; a sleeve 12; a connecting vertical plate 13; a back frame vertical bar 14; a baffle 15; a limiting mechanism 16; a longitudinal baffle 17; a stopper pin 18; an arc-shaped limiting groove 19; and a second torsion spring 20.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, the term "at least one" means one or more unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The specific implementation manner of the utility model is as follows:

as shown in fig. 1-12, the present invention provides a chair back folding mechanism, which comprises a back frame 1, a handrail frame 2 and a rotating device 3.

As shown in fig. 3-12, the rotating device 3 is arranged between the back frame 1 and the handle frame 2, the rotating device 3 includes a rotating shaft 4 and a shaft hole 5, the rotating shaft 4 is matched with the shaft hole 5, the shaft hole 5 is arranged on the side surface of the handle frame 2, and the head of the rotating shaft 4 is matched with the shaft hole 5 and then passes through the shaft hole 5; the shaft hole 5 is provided with an upper hole site and a lower hole site which are adjacent, the hole site below the shaft hole 5 is a limiting hole site 6 used for limiting the rotation of the rotating shaft 4, the limiting hole site 6 is a U-shaped hole, two sides of the head part of the rotating shaft 4 are respectively provided with a corresponding notch 42, the notches 42 can be clamped and matched with two sides of the limiting hole site 6, and when the rotating shaft 4 is clamped and connected with the limiting hole site 6, the rotating shaft 4 cannot rotate; the upper hole position of the limiting hole position 6 is a movable hole position 7, the size of the movable hole position 7 is set to enable the rotating shaft 4 to rotate, specifically, the outline of one side of the movable hole position 7 is arc-shaped and is consistent with the arc-shaped outline of the head surface of the rotating shaft 4, and after the rotating shaft 4 is matched with the movable hole position 7, the rotating shaft 4 can freely rotate in the movable hole position 7.

As shown in fig. 2-6 and 12, after the rotating shaft 4 penetrates through the shaft hole 5, a limiting plate 8 is arranged at the head of the rotating shaft 4 to limit the rotating shaft 4 to slide out of the shaft hole 5, and the limiting plate 8 is fixed at the top of the rotating shaft 4 through a mounting screw 9; a first torsion spring 10 is arranged between the rotating shaft 4 and the armrest frame 2, the first torsion spring 10 is fixed on the side surface of the armrest frame 2 through a screw, one end of the first torsion spring 10, namely one spring arm (not shown), is inserted into the insertion hole 11 of the armrest frame 2 and is kept fixed relative to the armrest frame 2, the other end of the first torsion spring 10, namely the other spring arm 102, is abutted between the limiting plate 8 and the head of the mounting screw 9 and is positioned above the mounting screw 9, and the limiting plate 8 and the mounting screw 9 ensure that the first torsion spring 10 cannot slide out; when the rotating shaft 4 is located at the restriction hole site 6, the first torsion spring 10 does not deform or deforms less, when the rotating shaft 4 is located at the movable hole site 7, the first torsion spring 10 deforms and provides a downward return elastic force for the rotating shaft 4, so that the rotating shaft 4 keeps the trend of being clamped in the restriction hole site 6, the rotating shaft 4 is adjusted to return to the restriction hole site 6 from the movable hole site 7, and the labor is saved more easily, while fig. 1-10 show that the spring arm 102 at the other end of the first torsion spring 10 is located below the mounting screw 9, which all represent the state that the rotating device is just mounted up; in normal use, the spring arm 102 needs to be pulled above the mounting screw 9, so as to provide a downward return elastic force to the rotating shaft 4 during rotation.

As shown in fig. 1, 2 and 12, the rotating device 3 further includes a sleeve 12 and two connecting vertical plates 13 arranged at intervals, and the connecting vertical plates 13 are respectively connected and fixed on the left and right sides of the back frame vertical rod 14; a limiting table 41 is arranged in the middle of the rotating shaft 4, the sleeve 12 can be sleeved with the rotating shaft 4, and a through hole matched with the sleeve 12 is arranged on the connecting vertical plate 13; during installation, the sleeve 12 is sleeved at the tail of the rotating shaft 4 and is abutted against the left side of the limiting table 41 on the rotating shaft 4, and then the sleeve 12 penetrates through the through holes on the two connecting vertical plates 13 to be matched with the connecting vertical plates 13; the bottom of the rotating shaft 4 is connected with a baffle 15 through a screw, and the baffle 15 prevents the sleeve 12 from sliding out of the rotating shaft 4; the connecting vertical plate 13 is in running fit with the rotating shaft 4 through the sleeve 12.

As shown in fig. 2, 4 and 6, a rotation limiting mechanism 16 is further disposed between the vertical connecting plate 13 and the rotating shaft 4, specifically: a longitudinal baffle 17 is arranged on the right side of the limiting table of the rotating shaft 4, the longitudinal baffle 17 is penetrated by the rotating shaft 4 and fixed with the rotating shaft 4, a limiting pin 18 protruding towards the direction of the connecting vertical plate 13 is arranged at the lower end of the longitudinal baffle 17, and an arc-shaped limiting groove 19 is arranged at the corresponding position of the connecting vertical plate 13; when the back frame 1 rotates, the back frame 1 rotates back and forth around the rotating shaft 4 through the connecting vertical plate 13 under the action of the limiting pin 18 and the arc limiting groove 19. A second torsion spring 20 is arranged between the back frame 1 and the rotating shaft 4, the second torsion spring 20 is sleeved at the tail of the rotating shaft 4 and is positioned between the longitudinal baffle 17 and the connecting vertical plate 13, one end of the second torsion spring 20 is abutted against the positioning pin 18, and the other end of the second torsion spring 20 bypasses the back frame vertical rod 14 to be bent and coated on the back frame vertical rod 14; when the back frame 1 is tilted forward and backward, the second torsion spring 20 is deformed to provide a return elastic force to the back frame 1.

As shown in fig. 3-10, the back frame 1 has a folded state and a use state, and when the back frame 1 is in the use state, as shown in fig. 3, 4, 7, and 8, the rotating shaft 4 is located on the limiting hole site 6, the rotating shaft 4 is not rotatable, and the back frame 1 can tilt back and forth at a certain angle under the action of the limiting mechanism; as shown in fig. 5, 6, 9 and 10, when the back frame 1 needs to be folded, the back frame 1 is lifted upwards, the back frame 1 drives the rotating shaft 4 to lift through the connecting vertical plate 13, so that the rotating shaft 4 enters the movable hole 7, the rotating shaft 4 can rotate freely at the moment, and the back frame 1 is turned forwards to a folded state around the handrail frame 2 through the rotating shaft 4.

Claims (11)

1. A chair back folding mechanism is characterized in that: the foldable handrail comprises a back frame, a handrail frame and a rotating device, wherein the back frame is in rotatable fit with the handrail frame through the rotating device, the back frame is provided with a folding state and a using state, and the back frame is forwards turned when the back frame is in the folding state; when in use, the back frame is in a backward inclined state; the rotating device comprises a rotating shaft and a shaft hole, the rotating shaft is arranged on one of the handrail frame or the back frame, and the shaft hole is arranged on the other of the back frame or the handrail frame; the shaft hole is provided with a limiting hole position for limiting the rotation of the rotating shaft and a movable hole position for enabling the rotating shaft to freely rotate, and when the rotating shaft is located at the limiting hole position, the back frame is in a use state; when the rotating shaft is in the movable hole position, the back frame can be forwards turned to a folded state from a use state.

2. The chair back folding mechanism of claim 1, wherein: the shaft hole establish on handrail frame, pivot and shaft hole cooperation back pass the shaft hole, the restriction hole site be one "U" type hole, the pivot both sides be equipped with and correspond incision and the cooperation of U type hole joint.

3. The chair back folding mechanism of claim 2, wherein: the movable hole site be located restriction hole site top, and movable hole site size sets up to make the pivot freely rotate.

4. The chair back folding mechanism of claim 2, wherein: a first torsion spring is arranged between the rotating shaft and the armrest frame, one end of the first torsion spring is fixed relative to the armrest frame, and the other end of the first torsion spring acts on the rotating shaft, so that the rotating shaft is kept clamped in the trend of limiting the hole positions.

5. The chair back folding mechanism of claim 4, wherein: the rotating shaft head is provided with a limiting plate, the limiting plate is connected to the rotating shaft through a mounting screw, and one end of the first torsion spring abuts against the limiting plate and the mounting screw.

6. The chair back folding mechanism of claim 1, wherein: the rotating device further comprises a sleeve and a connecting vertical plate arranged at intervals, the connecting vertical plate is fixedly connected with the back frame, the sleeve is sleeved with the rotating shaft and then penetrates through the connecting vertical plate, and the connecting vertical plate is in running fit with the rotating shaft through the sleeve.

7. The chair back folding mechanism of claim 6, wherein: still include second torsion spring, second torsion spring one end and pivot relatively fixed, the other end of second torsion spring acts on the back of the body frame, provides the elasticity that resets for the back of the body frame when the user state inclines to face upward.

8. The chair back folding mechanism of claim 6, wherein: the rotating shaft is provided with a longitudinal baffle, and a limiting mechanism is arranged between the longitudinal baffle and the connecting vertical plate.

9. The chair back folding mechanism of claim 8, wherein: the limiting mechanism comprises a limiting pin and a limiting groove, the limiting pin is arranged on the longitudinal baffle, and the limiting groove is correspondingly arranged on the connecting vertical plate.

10. The chair back folding mechanism of claim 6, wherein: the tail part of the rotating shaft is connected with a baffle plate which is used for limiting the sleeve to be separated from the rotating shaft.

11. A seat, characterized by: comprising a chair back folding mechanism as claimed in any one of claims 1 to 10.

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