CN216089696U - Noon break chair - Google Patents

Abstract

The utility model discloses a noon break chair which comprises a back support piece, a back support and a support adjusting mechanism, wherein the upper part of the back support is rotatably connected with the middle part of the back support piece; the back support piece rotates on the back support frame, when the back support piece is at an initial position, the back support piece is positioned at the front side of the back support frame, when the whole back support piece tilts backwards, the lower end of the back support piece deflects forwards, and the upper end of the back support piece deflects backwards and reaches the back of the back support frame; the support adjusting assembly is configured to support the back support to stay at the corresponding position; compared with the prior art, the rotation connection point of the back support and the back support piece is positioned in the middle of the back support piece, so that when the back support piece rotates, the whole body can be inclined and tilted, and the angle change of the back support piece is larger; this seat inclines through back support piece's whole and faces upward and reaches the angle that is fit for the human body and leans on to lie, also can reach the waist effect simultaneously, and is more comfortable during the noon break, has also avoided not having the potential hidden danger that the waist brought, uses when being fit for people's noon break more.

Description

Noon break chair

Technical Field

The utility model relates to the field of office furniture, in particular to a noon break chair.

Background

With the rapid development of science and technology and the increasing social pressure, health has become an important topic of increasing social attention. Although physical labor is liberated in science and technology, people get involved in mental labor of long-time sitting on a desk, which directly leads to the continuous increase of the number of groups of long-time sitting in China, and people who sit for a long time can continuously adjust the positions of the buttocks to ensure the comfort of sitting; the chair in the office often has the function of allowing a user to rest by lying, and after a period of noon break, the working efficiency can be improved to a certain extent; when people generally lie on the chair, a small part of the buttocks is in contact with the front part of the chair, the back part of the chair is in contact with the chair back, and the waist part of the chair loses support, so that the use comfort is influenced, and the physical condition and the health are adversely influenced for a long time.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a noon break chair, wherein a back support piece is rotatably connected to a back support, the angle suitable for leaning and lying of a human body is achieved through the integral inclination of the back support piece, and meanwhile, the waist supporting effect can be achieved.

The technical scheme of the utility model is realized as follows:

a lunch break chair comprising:

a back bracket configured to support a body of the back support;

a back support disposed on the back support and configured to support a lumbar portion of a human body; the upper part of the back bracket is rotationally connected with the middle part of the back support piece; the back support piece rotates on the back support frame, when the back support piece is at an initial position, the back support piece is positioned at the front side of the back support frame, when the whole back support piece tilts backwards, the lower end of the back support piece deflects forwards, and the upper end of the back support piece deflects backwards and reaches the back of the back support frame;

and the supporting and adjusting assembly is arranged between the back support and the back support piece, two ends of the supporting and adjusting assembly are respectively connected to the lower part of the back support and the lower end of the back support piece, and the supporting and adjusting assembly is configured to support and stop the back support piece at a corresponding position.

Because the rotation connection point of the back support and the back support is positioned in the middle of the back support, when the back support rotates, the whole body of the back support has inclination change, and the angle change of the back support is larger; this seat inclines through back support piece's whole and faces upward and reaches the angle that is fit for the human body and leans on to lie, also can reach the waist effect simultaneously, and is more comfortable during the noon break, has also avoided not having the potential hidden danger that the waist brought, uses when being fit for people's noon break more.

Preferably, the upper part of the back support is provided with a rotary connecting lug, the middle part of the back support is provided with a rotary seat, and the back support are rotatably connected with the rotary seat through the rotary connecting lug.

Preferably, the rotation range of the back support is 0-45 degrees, and when the back support tilts backwards, the whole back support rotates from a roughly vertical angle to an inclination angle suitable for rest. The user can adjust the tilt angle of the back support by himself to find the appropriate or desired angle.

Preferably, the back support comprises an upper back component and a lower back component which are separated from each other up and down, the lower part of the upper back component is rotatably connected with the back bracket, and the lower part of the lower back component is rotatably connected with the support adjusting component; the lower part of the upper back component is connected with the upper part of the lower back component through a spring steel sheet. The spring steel sheet has the effect that the lower back component can be better attached to the waist of a human body to realize the effect of supporting the waist.

Preferably, a gap is formed between the lower part of the upper back component and the upper part of the lower back component, and the upper back component and the lower back component are opened and closed through elastic deformation of a spring steel sheet; the upper back component and the lower back component are opened relatively, and the upper back component rotates backwards relative to the lower back component until the rear end of the lower part of the upper back component abuts against the upper part of the lower back component. The arrangement can limit the relative rotation between the upper back component and the lower back component and can prevent the spring steel sheet from being damaged due to overlarge stress.

Preferably, the supporting and adjusting assembly can be any one of an electric push rod, an air rod or a hydraulic rod, two ends of the supporting and adjusting assembly are respectively connected with the back support and the back support in a rotating manner, and the inclination angle of the supporting and adjusting assembly relative to the horizontal plane changes along with the opening and closing movement of the back support. The common and universal accessories such as the electric push rod, the air rod or the hydraulic cylinder are used as the supporting and adjusting component, so that the development cost is saved, and the function of the supporting and adjusting component can be realized.

Preferably, the support adjusting assembly comprises a first support seat and a second support seat, and the first support seat and the second support seat generate relative movement when the back support moves in an opening and closing manner; the clamping mechanism is arranged between the first supporting seat and the second supporting seat, when the back supporting piece is opened forwards, the clamping mechanism keeps the position of the first supporting seat and the second supporting seat after relative movement, the clamping mechanism comprises a rack, a clamping tongue and a spring, a plurality of clamping grooves are distributed on the rack along the length direction, and the clamping tongue rotates around a pivot and keeps the trend of clamping with the clamping grooves under the action of the spring. Supporting and holding the back support in the respective position is achieved.

Preferably, the clamping mechanism further comprises a tongue seat and a limiting piece, the clamping tongue is connected to the tongue seat, and the tongue seat is connected with the pivot; the rack comprises a clamping tooth section, a plurality of clamping teeth are distributed on the clamping tooth section along the length direction, and a clamping groove is formed between every two clamping teeth; along the length direction, the two ends of the rack at the clamping tooth section are respectively provided with a clamping tongue jacking and holding section and a rotary boss; along the thickness direction of the rack, the heights of the clamping tongue jacking and holding section and the rotary boss are both greater than the height of the clamping tooth section; the tongue base is also provided with a locking tongue matched with the limiting piece, when the clamping tongue is positioned at the clamping tooth section, the clamping tongue is in clamping fit with the clamping groove at the corresponding position, and the limiting piece does not limit the locking tongue; when the clamping tongue abuts against the clamping tongue jacking and maintaining section, the clamping tongue rotates towards the direction leaving the clamping groove, the limiting piece locks the locking tongue and enables the clamping tongue to maintain the unlocking state of being disengaged from the clamping groove, and when the first supporting seat and the second supporting seat move relatively, the limiting piece crosses over the clamping tooth section and touches the rotary boss, so that the clamping tongue rotates reversely to be clamped with the clamping groove, and the locking tongue is disengaged from the limiting piece. The clamping grooves are matched with the clamping grooves at corresponding positions, and at the moment, the lower end of the back support can be continuously opened forwards but cannot be drawn back, so that the back support is supported by the support adjusting mechanism; after the first supporting seat and the second supporting seat move relatively, the clamping tongue can be clamped with different clamping grooves, so that the back supporting piece is supported and kept at a corresponding position by the supporting and adjusting mechanism; the clamping tongue jacks up the holding section to enable the clamping tongue to rotate excessively, and the limiting piece can lock the locking tongue, so that the lower end of the back support piece can be drawn back and cannot be supported; the rotary boss can unlock the locked clamping tongue so as to be clamped with the clamping groove again and recover the support of the support adjusting mechanism to the back support piece; the structure is ingenious.

Preferably, the height of the clamping tongue jacking and holding section in the thickness direction of the rack is lower than that of the rotary boss. The arrangement is used for preventing the clamping tongue from directly crossing the rotary boss after being jacked and locked, so that the rotary boss is invalid.

Preferably, the locking tongue and the limiting part are staggered all the time, and when the locking tongue rotates, the locking tongue goes over the limiting part through elastic deformation and is abutted to the limiting part to be locked or is separated from the limiting part to be unlocked. The locking mode is simple and effective, an independent mechanism is not needed for locking the clamping tongue, the tongue seat and the locking tongue, and cost and assembly time are saved.

Preferably, at least one of the limiting member and the locking tongue is an elastic member.

Preferably, the first support seat is a hollow sleeve, and the rack is fixedly arranged in the first support seat; the clamping tongue, the tongue seat, the spring and the limiting piece are arranged on the second supporting seat, and the first supporting seat is in sleeve fit with the second supporting seat; the second supporting seat is rotatably connected with the back support, and the first supporting seat is rotatably connected with the back support. When the lower end of the back support frame is required to move in an opening and closing manner, the first support seat and the second support seat move relatively along with the back support frame, and the first support seat and the second support seat are required to be respectively connected with the back support piece and the back support frame in a rotating manner.

Preferably, the spring is a torsion spring, the tongue base is rotatably connected with the second support base through a pivot, the torsion spring is sleeved on the pivot, the first torsion arm and the second support base of the torsion spring are kept relatively fixed, and the second torsion arm of the torsion spring acts on the tongue base. The torsion spring is used for returning the clamping tongue, so that the clamping tongue can be clamped with the corresponding clamping groove all the time after the first supporting seat and the second supporting seat move relatively.

Preferably, the limiting member is a plate-shaped body which is fixedly mounted on the second supporting body, and one end of the limiting member is suspended to form a limiting part matched with the locking tongue. When the limiting part locks the clamping tongue, the limiting part props against the locking tongue to resist the elasticity of the torsion spring.

Preferably, the supporting and adjusting assembly is inclined upwards between the back support and the back support piece from back to front, and when the lower end of the back support piece moves forwards, the included angle between the whole supporting and adjusting assembly and the horizontal plane is reduced. The effective supporting force of the supporting and adjusting assembly to the back supporting piece is larger, and the structure is more stable.

The design starting point, the idea and the beneficial effects of the utility model adopting the technical scheme are as follows:

the utility model provides a noon break chair, compared with the prior art:

1. because the rotation connection point of the back support and the back support is positioned in the middle of the back support, when the back support rotates, the whole body of the back support has inclination change, and the angle change of the back support is larger; this seat inclines through back support piece's whole and faces upward and reaches the angle that is fit for the human body and leans on to lie, also can reach the waist effect simultaneously, and is more comfortable during the noon break, has also avoided not having the potential hidden danger that the waist brought, uses when being fit for people's noon break more.

2. The spring steel sheet has the function that the lower back component can be better attached to the waist of a human body to realize the effect of supporting the waist; and a limiting structure is arranged between the upper back component and the lower back component, so that the spring steel sheet can be effectively prevented from being damaged and losing efficacy.

3. The supporting and adjusting assembly is inclined upwards between the back support and the back support piece from back to front, and when the lower end of the back support piece moves forwards, the included angle between the whole supporting and adjusting assembly and the horizontal plane is reduced; the arrangement enables the effective supporting force of the supporting and adjusting assembly to the back supporting piece to be larger, the structure to be more stable, and the user can feel more safe when lying on the chair.

Drawings

FIG. 1 is a first perspective view of a back support in an initial position according to an embodiment of the present invention;

FIG. 2 is a second schematic perspective view of the back support in the initial position according to the present invention;

FIG. 3 is a side view of the back support tilted on the back bracket in an embodiment of the present invention;

FIG. 4 is a schematic perspective view of the rotating base disposed on the back support according to the embodiment of the present invention;

FIG. 5 is a perspective view of a back support in an embodiment of the present invention;

FIG. 6 is a schematic perspective view of a support adjustment assembly according to an embodiment of the present invention;

FIG. 7 is a schematic perspective view of the embodiment of the present invention illustrating the engagement between the latch and the slot;

FIG. 8 is a cross-sectional view of the support adjustment assembly with the latch tongue in the primary slot in an embodiment of the present invention;

FIG. 9 is an enlarged view of portion B of FIG. 8;

FIG. 10 is a cross-sectional view of the support adjustment assembly with the latch engaging the slot in an embodiment of the present invention;

FIG. 11 is an enlarged view of portion C of FIG. 10;

FIG. 12 is a cross-sectional view of the support adjustment assembly after the locking tongue is locked by the limiting portion in an embodiment of the utility model;

FIG. 13 is an enlarged view of portion D of FIG. 12;

FIG. 14 is a cross-sectional view of a support adjustment assembly with the latch being set back by a surface of revolution in an embodiment of the utility model;

FIG. 15 is an enlarged view of section E of FIG. 14;

FIG. 16 is an exploded view of a first support adjustment assembly in an embodiment of the present invention;

FIG. 17 is an exploded view of a second support adjustment assembly in an embodiment of the present invention;

FIG. 18 is a first perspective view illustrating a rack and a second support base according to an embodiment of the present invention;

FIG. 19 is a second perspective view of the rack and the second support base according to the embodiment of the present invention;

fig. 20 is a schematic perspective view of the upper back assembly and the lower back assembly combined by a spring steel sheet according to the embodiment of the present invention.

The figures are numbered: a back support 1; a back support 2; a support adjustment assembly 101; a first support 102; a second support seat 103; a rack 104; a latch tongue 105; a card slot 106; a pivot 107; a torsion spring 108; a latch section 109; a latch 110; a self-locking face 111; a sliding surface 112; a tongue base 113; a locking tongue 114; an elastic sheet 115; a stopper portion 116; a latch jack-up retention section 117; a swivel boss 118; a jacking surface 119; a last stage card slot 120; a surface of revolution 121; a primary card slot 122; a first torsion arm 123; a second torque arm 124; an upper back assembly 125; a vertical bar 1251; an upper crossbar 1252; a lower cross bar 1253; a lower back assembly 126; a rotating seat 127; the rotary connecting lug 128; a spring steel plate 129; a gap 130.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings. 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 than one 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 embodiment of the utility model is as follows:

as shown in fig. 1-3, the present invention provides a noon break chair comprising a back support 1, a back support 2, and a support adjustment assembly 101.

The back support 1 is configured to support the main body of the back support 2, the back support 2 is arranged on the back support 1, and is configured to support the waist and back of a human body, and a back cushion can be wrapped or a mesh cloth can be laid on the front side of the back support 2; the upper part of the back bracket 1 is rotationally connected with the middle part of the back support 2; the back support 2 rotates on the back support 1, when the back support 2 is in an initial position, the back support 2 is positioned at the front side of the back support 1, when the back support 2 integrally tilts backwards, the lower end of the back support 2 deflects forwards, and the upper end of the back support 2 deflects backwards and reaches the back of the back support 1; the support adjusting assembly 101 is disposed between the back support 1 and the back support 2 and the support adjusting assembly 101 is connected to the lower portion of the back support 1 and the lower end of the back support 2, and configured to support and stop the back support 2 at a corresponding position.

As shown in fig. 3-5, the back support 2 has a support surface against which the lumbar back of the person rests; when the back support 2 is in the initial position, the support surface is substantially forward, the person sits on the seat in a sitting position with the lumbar portion substantially upright against the support surface; when the back support member 2 tilts backwards, the support surface of the back support member 2 faces upwards and forwards, a human body can reliably lie on the seat, the waist and the back can still lean against the support surface, at the moment, a user can have a lunch break on the seat, and the waist can also be supported by the lower end of the back support member 2, so that the waist supporting effect is realized; further, the rotation range of the back support member 2 is 0-45 °, that is, from the initial position, the back support member 2 can tilt backward by 45 °, so as to satisfy the reclining angle of most people during rest, and the user can also support the back support member 2 through the support adjusting assembly 101 and stay at different angles between 0-45 ° to find the angle suitable for self rest.

The back support 2 can rotate relative to the back bracket 1, and further the support adjusting assembly 101 supports and keeps the back support 2 at a corresponding position after rotating, so that each inclination angle of the back support 2 can bear the weight of a human body; two ends of the supporting and adjusting assembly 101 are respectively rotatably connected with the back support 1 and the back support 2, and the inclination angle of the supporting and adjusting assembly 101 relative to the horizontal plane changes along with the inclination of the back support 2.

As shown in fig. 4 and 5, the upper part of the back support 1 is provided with a rotary connecting lug 128, the middle part of the back support 2 is provided with a rotary seat 127, and the back support 2 and the back support 1 are rotatably connected with the rotary seat 127 through the rotary connecting lug 128; specifically, the back support 2 comprises an upper back component 125 and a lower back component 126 which are separated up and down, both the upper back component 125 and the lower back component 126 are of a frame structure, the upper back component 125 comprises two symmetrically arranged vertical rods 1251, an upper cross rod 1252 and a lower cross rod 1253 which connect the vertical rods 1251, and the rotating seat 127 is arranged on the lower cross rod 1253 and protrudes towards the back support 1; the back support 1 is an L-shaped plate-shaped body, two rotary connecting lugs 128 are provided, the two rotary connecting lugs 128 are spaced and arranged at the position close to the upper end of the plate-shaped body and protrude towards the back support 2, and the rotary seat 127 enters between the two rotary connecting lugs 128 and is rotatably connected with the rotary connecting lugs by a rotary shaft (not shown); that is, the upper back assembly 125 is rotatably connected to the back frame 1, the upper back assembly 125 is mainly used for supporting the back of the human body, and the lower back assembly 126, which is positioned below the rotational connection point, rotates with the rotation of the upper back assembly 125, and is mainly used for supporting the waist of the human body; since the lower back assembly 126 is located below the rotational connection point of the back support 1 and the back support 2, after the back support 2 is tilted backward as a whole, the lower back assembly 126 will be lifted to realize waist support; the support adjusting assembly 101 is disposed at a lower portion of the back bracket 1 and is rotatably coupled to the lower back assembly 126.

As shown in fig. 20, the lower cross bar 1253 of the upper back assembly 125 is connected to the upper portion of the lower back assembly 126 through a spring steel plate 129, so that the lower back assembly 126 has elasticity and can rotate relative to the upper back assembly 125, which is used to make the lower back assembly 126 fit the waist of the human body more, thereby improving the comfort; a gap 130 is formed between the lower part of the upper back assembly 125 and the upper part of the lower back assembly 126, and the upper back assembly 125 and the lower back assembly 126 are elastically deformed by the spring steel sheet 129 to move in an opening and closing way; upper back assembly 125 and lower back assembly 126 are opened relatively, upper back assembly 125 rotates backward relative to lower back assembly 126 until lower cross bar 1253 of upper back assembly 125 abuts against the upper portion of lower back assembly 126, so that the relative rotation angle of upper back assembly and lower back assembly is limited, spring steel sheet 129 is protected, and breaking caused by excessive load bearing is prevented.

Since the electric push rod, the air rod and the hydraulic cylinder are all common, the case that the supporting and adjusting component is the electric push rod, the air rod or the hydraulic rod is not illustrated in detail in the embodiment; in order to make the supporting and adjusting assembly 101 have a strong supporting force without on-off control, the supporting and adjusting assembly 101 is designed as follows:

as shown in fig. 2 and 6-19, the support adjustment assembly 101 includes a first support seat 102 rotatably connected to the back support 2 and a second support seat 103 rotatably connected to the back frame 1, wherein the first support seat 102 and the second support seat 103 move relatively when the back support 2 moves in an opening and closing manner; the first supporting seat 102 is a hollow sleeve, the first supporting seat 102 is sleeved on the second supporting seat 103, and the supporting and adjusting assembly 101 extends and retracts when the back supporting piece 2 moves in an opening and closing manner; a clamping mechanism is arranged between the first supporting seat 102 and the second supporting seat 103, the clamping mechanism is configured to keep the positions of the first supporting seat 102 and the second supporting seat 103 after relative movement when the back supporting member 2 is opened forwards, the clamping mechanism comprises a rack 104, a clamping tongue 105 and a spring, a plurality of clamping grooves 106 are distributed on the rack 104 along the length direction, and the clamping tongue 105 rotates around a pivot 107 and keeps the trend of clamping with the clamping grooves 106 under the action of the spring; the spring is a torsion spring 108; the clamping mechanism mainly plays a role in enabling the supporting and adjusting assembly 101 to have the self-locking capability of supporting the back support 2 when the supporting and adjusting assembly 101 leans against the back support 2 backwards at the waist and back, but the clamping mechanism does not have the self-locking capability of enabling the supporting and adjusting assembly 101 to be self-locked when the back support 2 is unfolded.

The rack 104 is installed in the first support seat 102 and comprises a latch section 109, a plurality of latches 110 are distributed on the latch section 109 along the length direction, a slot 106 is formed between every two latches 110, the latches 110 are right-angled trapezoidal, each latch 110 comprises a sliding surface 112 and a self-locking surface 111 perpendicular to the relative movement direction of the first support seat and the second support seat, the sliding surface 112 on the same latch 110 is inclined relative to the self-locking surface 111, an included angle between the two is an acute angle, and the sliding surface 112 is closer to the back support member 2 relative to the self-locking surface 111; the latch 105 is in a triangular prism shape and comprises a tip 129, the tip 129 of the latch 105 is clamped into the slot 106 and is in clamping fit with the slot 106, when the waist and back lean against the back support 2 backwards, the support adjusting assembly 101 has a contraction trend, that is, the first support seat 102 has a backward movement trend relative to the second support seat 103, at this time, the self-locking surface 111 abuts against the tip 129 of the latch 105, and the latch 105 prevents the first support seat 103 from moving backwards, that is, self-locking of the support adjusting assembly 101 during contraction is completed; when the back support member 2 is pulled to open by one stage, the support adjusting assembly 101 extends by one stage, that is, the first support seat 102 moves forward by one stage relative to the second support seat 103, and in the process, the sliding surface 112 slides relative to the latch 105 until the latch 105 is latched into the next latch groove 106; each stage of the back support 2 opening corresponds to one of the slots 106.

The clamping mechanism further comprises a tongue seat 113 and a limiting piece, the clamping tongue 105 is connected to the tongue seat 113, the tongue seat 113 is sleeved on the pivot 107, the tongue seat 113, the clamping tongue 105 and the torsion spring 108 are arranged on the second support seat 103, the torsion spring 108 is sleeved on the pivot 107, the first torsion arm 123 of the torsion spring 108 and the second support seat 103 are kept relatively fixed, and the second torsion arm 124 of the torsion spring 108 acts on the tongue seat 113, so that the tongue seat 113 can be restored to an initial position after rotating around the pivot 107; the tongue base 113 is also provided with a locking tongue 114 matched with the limiting piece, the locking tongue 114, the tongue base 113 and the clamping tongue 105 are integrally formed, and an included angle of 130 degrees is formed between the locking tongue 114 and the clamping tongue 105; the limiting member is a plate-shaped elastic sheet 115 fixed on the second supporting body, the elastic sheet 115 and the locking tongue 114 are always staggered, and one end of the elastic sheet 115 is suspended to form a limiting portion 116 matched with the locking tongue 114.

Along the length direction, the rack 104 is respectively provided with a clamping tongue jacking and holding section 117 and a rotary boss 118 at two ends of the clamping tooth section 109; along the thickness direction of the rack 104, the heights of the clamping tongue jacking and holding section 117 and the rotary boss 118 are both greater than the height of the clamping tooth section 109, and the height of the rotary boss 118 is greater than the height of the clamping tongue jacking and holding section 117; the latch jacking and holding section 117 comprises a jacking surface 119 parallel to the sliding surface 112, and a final clamping groove 120 is formed between the jacking surface 119 and the last clamping tooth of the clamping tooth section 109; the rotary boss 118 comprises a rotary surface 121 parallel to the self-locking surface 111, and a primary clamping groove 122 is formed between the rotary surface 121 and the first clamping tooth of the clamping tooth section 109; when the latch tongue 105 is located on the latch section 109, the latch tongue 105 is in clamping fit with the corresponding position of the latch groove 106, and the limiting part 116 of the elastic sheet 115 does not limit the locking tongue 114; when the tip 129 of the latch tongue 105 relatively moves backwards from the last-stage card slot 120, the tip 129 abuts against the jacking surface 119 of the latch tongue jacking and holding section 117 to enable the latch tongue 105 to rotate towards the direction away from the card slot 106, the locking tongue 114 rotates along with the latch tongue 105, passes over the limiting part 116 of the elastic sheet 115 and abuts against the limiting part 116 to be locked, and the latch tongue 105 is enabled to keep the unlocking state of being disengaged from the card slot 106; at this time, the tip 129 of the latch 105 crosses over the latch section 109 when the support adjusting assembly 101 contracts, the tip 129 of the latch 105 touches the revolution surface 121 of the revolution boss 118, the latch 105 is urged to rotate reversely to be latched with the primary latch groove 122, and the locking latch 114 also rotates reversely to pass through the elastic piece 115 and disengage from the limiting part 116 of the elastic piece 115.

As shown in fig. 2 and 3, from back to front, the supporting and adjusting assembly 101 is inclined upward between the back support 1 and the back support member 2, and when the lower end of the back support member 2 moves forward, the included angle between the whole supporting and adjusting assembly 101 and the horizontal plane becomes smaller, so that the effective supporting force of the supporting and adjusting assembly 101 to the back support member 2 is larger, and the structure is more stable.

The supporting and adjusting mechanism is close to a human body, and is convenient to adjust, and the waist and back supporting and adjusting can be carried out only by pulling the back supporting piece 2 because the supporting and adjusting mechanism has the self-locking capability in the contraction direction and does not have self-locking in the extension direction.

Claims (14)

1. A noon break chair characterized by comprising:

a back bracket configured to support a body of the back support;

a back support disposed on the back support and configured to support a lumbar portion of a human body; the upper part of the back bracket is rotationally connected with the middle part of the back support piece; the back support piece rotates on the back support frame, when the back support piece is at an initial position, the back support piece is positioned at the front side of the back support frame, when the whole back support piece tilts backwards, the lower end of the back support piece deflects forwards, and the upper end of the back support piece deflects backwards and reaches the back of the back support frame;

and the supporting and adjusting assembly is arranged between the back support and the back support piece, two ends of the supporting and adjusting assembly are respectively connected to the lower part of the back support and the lower end of the back support piece, and the supporting and adjusting assembly is configured to support and stop the back support piece at a corresponding position.

2. A noon break chair according to claim 1, characterized in that: the upper part of the back support is provided with a rotary connecting lug, the middle part of the back support is provided with a rotary seat, and the back support are rotationally connected with the rotary seat through the rotary connecting lug.

3. A noon break chair according to claim 1, characterized in that: the rotation range of the back support member is 0-45 degrees, and when the back support member tilts backwards, the whole back support member rotates to an inclination angle suitable for rest from approximately vertical.

4. A noon break chair according to claim 1, characterized in that: the back support comprises an upper back component and a lower back component which are separated up and down, the lower part of the upper back component is rotationally connected with the back bracket, and the lower part of the lower back component is rotationally connected with the support adjusting component; the lower part of the upper back component is connected with the upper part of the lower back component through a spring steel sheet.

5. Noon break chair according to claim 4, characterized in that: a gap is formed between the lower part of the upper back component and the upper part of the lower back component, and the upper back component and the lower back component are opened and closed through elastic deformation of a spring steel sheet; the upper back component and the lower back component are opened relatively, and the upper back component rotates backwards relative to the lower back component until the rear end of the lower part of the upper back component abuts against the upper part of the lower back component.

6. A noon break chair according to claim 1, characterized in that: the support adjusting component can be any one of an electric push rod, an air rod or a hydraulic rod, two ends of the support adjusting component are respectively connected with the back support and the back support in a rotating mode, and the inclination angle of the support adjusting component relative to the horizontal plane changes along with the opening and closing movement of the back support.

7. A noon break chair according to claim 1, characterized in that: the support adjusting component comprises a first support seat and a second support seat, and the first support seat and the second support seat generate relative movement when the back support piece moves in an opening and closing manner; the clamping mechanism is arranged between the first supporting seat and the second supporting seat, when the back supporting piece is opened forwards, the clamping mechanism keeps the position of the first supporting seat and the second supporting seat after relative movement, the clamping mechanism comprises a rack, a clamping tongue and a spring, a plurality of clamping grooves are distributed on the rack along the length direction, and the clamping tongue rotates around a pivot and keeps the trend of clamping with the clamping grooves under the action of the spring.

8. Noon break chair according to claim 7, characterized in that: the clamping mechanism also comprises a tongue seat and a limiting piece, the clamping tongue is connected on the tongue seat, and the tongue seat is connected with the pivot; the rack comprises a clamping tooth section, a plurality of clamping teeth are distributed on the clamping tooth section along the length direction, and a clamping groove is formed between every two clamping teeth; along the length direction, the two ends of the rack at the clamping tooth section are respectively provided with a clamping tongue jacking and holding section and a rotary boss; along the thickness direction of the rack, the heights of the clamping tongue jacking and holding section and the rotary boss are both greater than the height of the clamping tooth section; the height of the clamping tongue jacking and maintaining section along the thickness direction of the rack is lower than that of the rotary boss; the tongue base is also provided with a locking tongue matched with the limiting piece, when the clamping tongue is positioned at the clamping tooth section, the clamping tongue is in clamping fit with the clamping groove at the corresponding position, and the limiting piece does not limit the locking tongue; when the clamping tongue abuts against the clamping tongue jacking and maintaining section, the clamping tongue rotates towards the direction leaving the clamping groove, the limiting piece locks the locking tongue and enables the clamping tongue to maintain the unlocking state of being disengaged from the clamping groove, and when the first supporting seat and the second supporting seat move relatively, the limiting piece crosses over the clamping tooth section and touches the rotary boss, so that the clamping tongue rotates reversely to be clamped with the clamping groove, and the locking tongue is disengaged from the limiting piece.

9. A noon break chair according to claim 8, characterised in that: the locking tongue and the limiting part are staggered all the time, and when the locking tongue rotates, the locking tongue crosses the limiting part through elastic deformation and is abutted with the limiting part to be locked or is separated from the limiting part to be unlocked.

10. A noon break chair according to claim 9, characterised in that: at least one of the limiting piece and the locking tongue is an elastic piece.

11. A noon break chair according to claim 8, characterised in that: the first support seat is a hollow sleeve, and the rack is fixedly arranged in the first support seat; the clamping tongue, the tongue seat, the spring and the limiting piece are arranged on the second supporting seat, and the first supporting seat is in sleeve fit with the second supporting seat; the second supporting seat is rotatably connected with the back support, and the first supporting seat is rotatably connected with the back support.

12. A noon break chair according to claim 8, characterised in that: the spring is a torsion spring, the tongue seat is rotatably connected with the second supporting seat through a pivot, the torsion spring is sleeved on the pivot, the first torsion arm of the torsion spring and the second supporting seat are relatively fixed, and the second torsion arm of the torsion spring acts on the tongue seat.

13. A noon break chair according to claim 8, characterised in that: the limiting piece is a plate-shaped body and is fixedly arranged on the second supporting body, and one end of the limiting piece is suspended to form a limiting part matched with the locking tongue.

14. A noon break chair according to claim 1, characterized in that: from back to front, support the adjusting part and be the slope of ramp up between back of the body support piece and back support piece, when back support piece lower extreme moved forward, support the whole contained angle with the horizontal plane of adjusting part and diminish.

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