CN212521280U - Seat depth adjusting mechanism and seat - Google Patents

Abstract

The utility model discloses a seat depth adjusting mechanism and a seat, wherein the seat depth adjusting mechanism comprises a seat support and a seat back component, the seat support is used for supporting the sitting of a human body, the seat back component is used for supporting the waist and the back of the human body and is connected with the seat, the seat support component comprises a back support piece and a support telescopic component, the upper end of the back support piece is rotatably arranged above the seat support, the support telescopic component is arranged between the back support piece and the seat support, and the seat depth adjusting mechanism is used for enabling the lower end of the back support piece to stop at different positions; a chair comprises a chassis and the seat depth adjusting mechanism, so that the seat depth of a user when the user sits on the chair can be adjusted through the movement of a back support under the condition that the seat and the chassis are not moved; compared with the prior art, the seat depth of a user when the user sits is adjusted through the movement of the back support piece, the mechanical design that the modularization degree of the seat or the chassis is low, the structure is complex and the assembly is complex for adjusting the seat depth is omitted, the cost is saved, and the assembly efficiency is improved.

Description

Seat depth adjusting mechanism and seat

Technical Field

The utility model relates to an office furniture field, in particular to seat depth adjustment mechanism and seat.

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 the science and technology liberates the physical labor, people get involved in mental labor of long-time sitting on a desk, the number of groups of long-time sitting in China is increased continuously, the positions of the buttocks of the people in the long-time sitting can be adjusted continuously to ensure the comfort of sitting, and when a user works, the user sits in the front two thirds position of the seat cushion most of the time, and the waist and the back of the user can not be supported by the backrest. With the increase of people, various age-incompatible waist diseases caused by sedentary behaviors are generated.

The reason for this is that when the user sits for a long time, the upper half of the body is completely pressed on the lumbar vertebrae, and the waist is not effectively supported. At this time, in order to support the waist, some people purchase various types of waist pads, and an office chair with unified office is disturbed by various colorful waist pads in color tone. The utility model provides a can adjust to sit deeply through the back, guarantee that the user sits deeply state at any one, the waist all can obtain effective support, reduces lumbar vertebrae disease's incidence, subtracts the unnecessary spending of purchasing the waist pillow simultaneously.

The seat depth of chairs in the market is mostly adjusted by designing and adjusting the seat, and the seat and the chassis of the common chairs are complex in structure, difficult to assemble and difficult to repair.

The chinese utility model patent of cn201820253966.x discloses a chair with adjusting function is leaned on to waist, including the back of the chair, seat support and footing, be equipped with the cavity on the back of the chair, upper portion in the cavity is installed the supporter through lifting the device of rolling over, it includes fixing base and linking arm to lift the device of rolling over, be equipped with the fixed arm on the fixing base, fixed arm and linking arm are articulated, and through the fixed synchronization motion of rigid connection piece with two at least linking arms, the fixing base is fixed with the back of the chair, rigid connection piece is fixed with the supporter. The utility model discloses a through set up the cavity on the back of the chair to install support piece in the cavity, through lifting the device articulated with the back of the chair, and support through pawl and ratchet location, realized the lumbar support of the back of the chair and adjusted. The utility model realizes the waist support adjustment by changing the structure of the chair back, and has high cost; the chair back can only be used for chair backs with thickness, such as the chair backs of leather chairs, and has limitation; the ratchet mechanism is added in the device, so that the device is difficult to assemble and is not suitable for modularized assembly production.

CN201810323197.0, the chinese utility model discloses an ergonomic chair, which comprises a chair back component and a chair seat component, wherein the chair back component comprises an upper back support, a lower back support, a chair back frame which is elastically deformed under the action of traction or extrusion, and a locking mechanism which keeps the above three components in relatively fixed positions; the back lower bracket is connected with the seat component through a connecting rod, the lower end of the back upper bracket is rotatably connected with the upper end of the back lower bracket, and the upper end and the lower end of the chair back frame are respectively hinged with the upper part of the back upper bracket and the lower part of the back lower bracket; the utility model can adjust the back upper support when unlocking aiming at different sitting posture states of different people or the same person, and can drive the back upper support to rotate and deform when pushing the back upper support to rotate because the back upper support is rich in elasticity, and the elasticity of the back upper support is used as the driving force for the back upper support to rotate and reset; when the locking mechanism is rotated to a posture and an angle suitable for a user, the locking mechanism locks. The upper half back frame of the utility model rotates forwards to extrude the whole elastic frame to support the waist and the back forwards, thereby adjusting the support of the waist with shorter stroke; and the seat depth is adjusted by overcoming the elasticity of the elastic frame and keeping the adjusted position to lock the upper and lower brackets, which is troublesome to operate and difficult to lock to a position comfortable for users.

CN03154650.1, chinese utility model patent, discloses a chair with adjustable seat depth, in the case of the chair with adjustable seat depth, the seat comprises a rigid support plate and a single, longitudinally elastic seat plate, the seat plate bears the seat cushion and is connected to the support plate in a longitudinally movable manner; longitudinal mobility is obtained by providing a guide strip mounted in a guide diameter in the upper surface of the seat plate, the guide strip being secured to the support plate by a screw passing through a slot in the bottom of the guide diameter. The chair seat has a complex structure, and after the seat plate moves forwards, a gap exists between the lower part of the chair back and the seat plate which moves forwards, so that the possibility of clamping a user exists; meanwhile, the chair back can not support the waist and the back well, and the hidden trouble of waist and back health exists.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a seat is dark adjustment mechanism, including configuring to support the human seat support of sitting and configuring to support the back of the chair subassembly that human back portion and be connected with the seat, the seat support subassembly includes back of the body support piece and supports flexible subassembly, and back of the body support piece upper end rotatably sets up in the seat support top, supports flexible subassembly setting between back of the body support piece and seat support, configures to through flexible so that back of the body support piece lower extreme stops in the different positions in seat support top.

Further, a chair is provided, which comprises a chassis and the seat depth adjusting mechanism, so that the seat depth of the seat when a user sits on the chair can be adjusted by the movement of the back support under the condition that the seat and the chassis are not moved.

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

a seat depth adjustment mechanism comprising:

a seat configured to support a human body to sit;

the chair back component is configured to support the waist and the back of a human body and is connected with the chair seat, the chair back component comprises a back support piece and a support telescopic component, the back support piece is rotatably arranged above the chair seat, one end of the support telescopic component is directly or indirectly connected with the chair seat, and the other end of the support telescopic component is connected with the back support piece; the support telescoping assembly is disposed behind the back support and is configured to telescope to cause the back support to rest in different positions above the seat.

Support flexible subassembly through flexible so that back of the body support piece stops in the different positions of seat support top, even back of the body support piece has the support ability in the deep position department of different seats, is applicable to the crowd of different heights weight to adapt to the different postures of sitting of user, improved and used the travelling comfort.

Preferably, the chair back assembly further comprises a back support, the lower end of the back support is fixedly connected with the chair seat, the back support comprises two lateral support rods which are bilaterally symmetrical and a top support rod connected to the upper ends of the lateral support rods, and a support seat is arranged at the rear end of the chair seat; the back support piece is arranged at the front side of the back support, the upper end of the back support piece is rotatably connected to the top support rod, the lower end of the back support piece moves relative to the back support in an opening and closing mode, and when the back support piece is opened forwards, the lower end of the back support piece approaches to the front end of the chair seat; when the back support piece approaches the back support frame backwards, the lower end of the back support piece approaches the rear end of the chair seat; one end of the supporting telescopic component is connected to the supporting seat. The opening and closing movement of the lower end of the back support piece relative to the back support is a realization mode that the lower end of the back support piece reaches different positions above the chair seat, the structure is simple, and the supporting capability of the chair back component can be enhanced; when the back support is a frame structure formed by combining a plurality of support rods, the support telescopic component is directly connected with the chair seat.

Preferably, the support base is provided with a support base integrally formed with the seat base at a middle position of the rear end of the seat base. The purpose of arranging the supporting seat on the seat is to directly connect the supporting telescopic assembly to the seat under the condition that the supporting telescopic assembly cannot be connected to the chair back, so that the supporting telescopic assemblies under different chair back structures are locally connected and play a role.

Preferably, the chair back assembly further comprises a back support, the back support comprises a main body upright, the width of the main body upright is smaller than that of the back support, the main body upright is positioned in the middle of the rear end of the back support, the lower end of the main body upright is fixedly connected with the chair seat, the upper end of the back support is rotatably connected to the upper end of the main body upright, the lower end of the back support moves in an opening and closing mode relative to the main body upright, and when the back support is opened forwards, the lower end of the back support; when the back support piece approaches the main body upright post backwards, the lower end of the back support piece approaches the rear end of the chair seat; one end of the supporting telescopic component is connected to the main body upright post. When the back support is including the main part stand, support flexible subassembly can be connected to on the main part stand, and its contained angle with the horizontal plane is littleer when comparing to be connected on the seat support, makes the support ability of supporting flexible subassembly stronger.

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

Preferably, the support telescopic 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 directly or indirectly connected with the seat in a rotating way, and the first supporting seat is connected with the back supporting piece in a rotating way. 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 or the integrally formed support seats on the back support piece and the seat.

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 support telescopic 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 support telescopic assembly and the horizontal plane is reduced. The effective supporting force for supporting the telescopic assembly to the back supporting piece is larger, and the structure is more stable.

Preferably, the connection position of the back bracket and the back support is 50-60cm away from the lower end of the back support. The lower end of the back support is far away from the joint of the back bracket and the back support, so that the stroke of the opening and closing movement of the back support is longer.

A seat comprises a chassis and the seat depth adjusting mechanism. .

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

the utility model provides a steel sheet side rust cleaning device compares prior art:

1. the upper end of the back support piece is rotatably connected to the back support piece and is supported by the support telescopic assembly after the back support piece moves, and when the lower end of the back support piece rotates around the upper end of the back support piece, the lower end of the back support piece moves back and forth above the chair seat, so that the function of adjusting the seat depth is achieved; the seat depth of a user sitting is adjusted through the movement of the back supporting piece under the condition that the seat and the chassis are not movable, the mechanical design that the modularization degree of the seat or the chassis is low for adjusting the seat depth, the structure is complex, and the assembly is complex is omitted, the cost is saved, and the assembly efficiency is improved.

2. For a chair seat which omits a mechanical structure for adjusting the depth of the seat, a more appropriate mechanism, such as a hidden footrest, can be arranged on the chair seat or the chassis.

3. The back support with different structures can be used with the support telescopic assembly, and even if the support telescopic assembly is connected to the back support, the support telescopic assembly is finally supported by the chair seat and acts on the back support, so that the application range is wide.

4. The structure of the chair back is not required to be changed, the back support and the back support piece are separated and combined in a mode of supporting the telescopic assembly, so that the cost is low, the modularization degree is high, the application range is wide, the assembly is simple and rapid, and the improvement of the production efficiency is facilitated.

5. When the open type chair back combined by the back support and the back support is used, even if the air rod or the electric push rod is used for jacking or falling back the back support, the appearance is monotonous and is not aesthetic when the air rod or the electric push rod is exposed outside due to fixed shape; in order to solve the problems, the telescopic support assembly is in a sleeved mode, the first support seat and the second support seat are fixed in a clamping mode, the outer shapes of the first support seat and the second support seat can be adjusted correspondingly according to the overall style of the seat, and therefore the attractiveness is improved, for example, the seat is designed to be in a cuboid shape or patterns are added on the appearance of the seat.

6. The supporting telescopic 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 telescopic assembly and the horizontal plane is reduced; the effective supporting force for supporting the telescopic assembly to the back supporting piece is larger, and the structure is more stable.

7. Under the same stroke, use the utility model provides a support flexible subassembly than the gas pole, initial length is shorter, and the volume is littleer.

Drawings

FIG. 1 is a schematic perspective view of an embodiment of the present invention showing a back support resting on a seat at different depths;

FIG. 2 is a schematic perspective view of an embodiment of the present invention showing a chair back assembly and a chair seat when the chair back assembly and the chair seat are not assembled;

fig. 3 is a schematic perspective view of the embodiment of the present invention after adjusting the back support member to extend the support telescoping assembly;

fig. 4 is a schematic perspective view of the telescopic support assembly according to the embodiment of the present invention;

fig. 5 is a schematic perspective view of the embodiment of the present invention showing the three-dimensional structure of the latch and the slot;

fig. 6 is a cross-sectional view of the support telescoping assembly with the latch tongue in the primary slot in an embodiment of the present invention;

FIG. 7 is an enlarged view of portion B of FIG. 6;

fig. 8 is a cross-sectional view of the supporting telescopic assembly when the latch is engaged with the slot in the embodiment of the present invention;

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

fig. 10 is a cross-sectional view of the support telescopic assembly after the locking tongue is locked by the limiting portion according to the embodiment of the present invention;

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

FIG. 12 is a cross-sectional view of the support telescoping assembly with the latch being pushed back by the surface of revolution in an embodiment of the invention;

FIG. 13 is an enlarged view of section E of FIG. 12;

fig. 14 is an exploded view of a first support telescoping assembly in an embodiment of the invention;

fig. 15 is an exploded view of the support telescoping assembly of the present invention in an embodiment;

fig. 16 is a first schematic perspective view illustrating a rack and a second support seat according to an embodiment of the present invention;

fig. 17 is a schematic perspective view of the rack and the second support seat according to the embodiment of the present invention;

FIG. 18 is a side view of an embodiment of the present invention showing a person leaning on when the seat has a longer seat depth;

FIG. 19 is a side view of the embodiment of the present invention showing a person sitting upright when the seat has a shorter seat depth;

fig. 20 is a side view of the embodiment of the present invention in which a human body leans against when the seat has a short seat depth;

FIG. 21 is a perspective view of the chair seat, chassis and back assembly of the present invention shown in an unassembled configuration;

fig. 22 is a side view of the lower end of the back support staying at different seat depths in an embodiment of the present invention;

fig. 23 is a side view of the embodiment of the present invention in which the back frame is a frame to support the mounting position of the telescopic assembly;

fig. 24 is a front view of the back support member with the back support being a frame according to an embodiment of the present invention.

The figures are numbered: a back support 1; a back support 2; supporting the telescoping 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; a seat 127; a chassis 128; a tip 129; a seatback assembly 151; a main body pillar 152; a support base 130; side support rods 131; the top support rods 132.

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:

most of the chairs with adjustable seat depth are realized by the design of the chair seat: or the front seat board can slide back and forth relative to the rear seat board, or the upper seat board can slide back and forth relative to the lower seat board; the design structure of the chair seat is complex and the assembly is not easy; moreover, once such a movable seat is designed for seat depth adjustment, mechanisms for other functions, such as hidden footrest, are difficult to provide on the seat; therefore, in order to ensure better compatibility of the chair seat, the mechanism for realizing the function of adjusting the depth of the chair seat is arranged between the chair back and the chair seat, so that the chair seat is not limited any more.

As shown in fig. 1, 2 and 18-20, the present invention provides a seat depth adjustment mechanism, comprising a seat 127 configured to support a person sitting thereon and a seat back assembly 151 configured to support a waist and back of the person, the seat back assembly 151 being connected to a chair, comprising a back support member 2 and a support extension assembly 101.

The upper end of the back support 2 is rotatably arranged above the seat 127, one end of the supporting telescopic assembly 101 is directly or indirectly connected to the seat 127, and the other end is connected to the lower part of the back support 2; the supporting and telescoping assembly 101 is arranged behind the back support member 2 and is configured to enable the lower end of the back support member 2 to stay at different positions above the seat 127 through telescoping, the supporting and telescoping assembly 101 is the mechanism for realizing the seat depth adjusting function, and the supporting and telescoping assembly does not influence the realization of other functions of the seat 127; the support telescoping assembly 101 is not free to telescope: the back support 2 is controlled by external force to move forwards along the seat depth direction relative to the seat 127, the support telescopic assembly 101 extends between the seat 127 and the back support 2 in response to the external force and supports the back support 2 to keep the corresponding seat depth position without retracting, namely when a user leans on the back support 2, the extended support telescopic assembly 101 supports the back support 2 without retracting and keeps the seat depth unchanged; the complete functionality of the support telescoping assembly 101 needs to be described in connection with its structure:

as shown in fig. 3-5, the support telescoping assembly 101 includes a first support base 102 rotatably connected to the back support 2 and a second support base 103 directly or indirectly rotatably connected to the seat 127, wherein the first support base 102 and the second support base 103 move relative to each other when the back support 2 moves; 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 telescopic assembly 101 is supported to perform telescopic motion when the back supporting piece 2 moves; 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 position of the first supporting seat 102 after relative movement with the second supporting seat 103 when the lower end of the back supporting member 2 rotates 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 has the function that when the supporting telescopic assembly 101 leans against the back support piece 2 backwards at the waist and back, the clamping mechanism enables the supporting telescopic assembly 101 to have the self-locking capacity of keeping the supporting back support piece 2 at the seat deep position, namely the supporting telescopic assembly cannot retract at the moment; however, the latch mechanism does not have the capability of self-locking the supporting telescopic assembly 101 when the lower end of the back support 2 rotates forward, i.e. the supporting telescopic assembly 101 extends when the lower end of the back support 2 rotates forward under the action of external force.

As shown in fig. 6-9, 14 and 15, the rack 104 is installed in the first supporting seat 102, and includes 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 rectangular trapezoidal, the latches 110 include sliding surfaces 112 and self-locking surfaces 111 perpendicular to the relative moving direction of the first and second supporting seats, the sliding surfaces 112 on the same latch 110 are inclined with respect to the self-locking surfaces 111, and the included angle between the two is an acute angle, and the sliding surfaces 112 are closer to the back supporting member 2 with respect to the self-locking surfaces 111; the clamping tongue 105 is in a triangular prism shape and comprises a tip 129, the tip 129 of the clamping tongue 105 is clamped into the clamping groove 106 and is in clamping fit with the clamping groove 106, when the waist back leans against the back support 2 backwards, the supporting telescopic assembly 101 has a contraction trend, namely the first supporting seat 102 has a tendency of moving backwards relative to the second supporting seat 103, at the moment, the self-locking surface 111 abuts against the tip 129 of the clamping tongue 105, the clamping tongue 105 prevents the first supporting seat 103 from moving backwards, and self-locking of the supporting telescopic assembly 101 during contraction is completed; when the back support member 2 is pulled to open by one stage, the support telescopic 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 tongue 105 until the latch tongue 105 is latched into the next latch groove 106; each stage of the back support 2 opening corresponds to one of the slots 106.

As shown in fig. 5-13, the latch mechanism further includes a tongue base 113 and a limiting member, the latch 105 is connected to the tongue base 113, the tongue base 113 is sleeved on the pivot 107, the tongue base 113, the latch 105 and the torsion spring 108 are disposed on the second support base 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 base 103 are relatively fixed, and the second torsion arm 124 of the torsion spring 108 acts on the tongue base 113, so that the tongue base 113 can return to the 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 telescopic 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. 3-20, the above paragraphs illustrate the complete function of the support telescoping assembly 101, including the initially described extension with the forward rotation of the lower end of the back support 2 and the support of the back support 2 held in the respective seat depth position; when the clamping tongue 105 is clamped with the last-stage clamping groove 120, the lower end of the back support member 2 continues to rotate forwards, the clamping tongue 105 can reach a jacking surface 119 of a clamping tongue jacking retaining section 117, then the locking tongue 114 is abutted and locked with a limiting part 116 of the elastic piece 115, the clamping tongue 105 and the clamping groove 106 are kept in a disengaged unlocking state, the support telescopic assembly 101 loses the support effect on the back support member 2, and at the moment, when the waist and the back lean against the back support member 2, the lower end of the back support member 2 rotates backwards, and the support telescopic assembly 101 contracts; when the lower end of the back support member 2 rotates backwards, the latch tongue 105 directly crosses the latch section 109 to reach the rotary boss 118, the tip end 129 of the latched latch tongue 105 touches the rotary surface 121, when an external force continues to act on the back support member 2 to enable the lower end of the back support member to rotate backwards, the latch tongue 105 is pushed back by the rotary surface 121 to be clamped with the primary slot 122, meanwhile, the latching tongue 114 is disengaged from the limiting part 116 of the elastic piece 115 to be unlocked, at the moment, the supporting telescopic assembly 101 restores the supporting effect on the back support member 2, when the back support member 2 rotates forwards under the external force, the supporting telescopic assembly 101 extends, and the latch tongue 105 passes through the latch section 109 from the primary slot 122 to the final slot 120 from the primary slot 122.

The direct or indirect attachment of support telescoping assembly 101 to seat 127 means:

the chair back assembly 151 further comprises a back support 1, the back support 1 is configured to support the main body of a back support 2, the lower end of the back support 1 is fixedly connected with the chair seat 127, and the back support 2 is arranged at the front side of the back support 1; the different configurations of the back support 1 determine whether the supporting telescopic assembly 101 can be arranged on the back support 1.

As shown in fig. 23 and 24, when the back frame 1 is a frame, the supporting telescopic assembly 101 is directly connected to the seat 127, for example: the back support 1 comprises two side support rods 131 which are arranged symmetrically left and right and a top support rod 132 connected to the upper ends of the side support rods, a support seat 130 is arranged at the middle position of the rear end of the seat 127, and the support seat 130 and the seat 127 are integrally formed; the upper end of the back support 2 is rotatably connected to the top support rod 132, the lower end of the back support 2 moves relative to the back support 1, and when the back support 2 opens forwards, the lower end of the back support 2 approaches the front end of the seat 127; when the back support 2 approaches the back support 1 backwards, the lower end of the back support 2 approaches the rear end of the seat 127; one end of the support telescoping assembly 101 is attached to the support base 130.

In this embodiment, the back support 1 is a column support, as shown in fig. 1 and 2, the back support 1 includes a main body column 152, the width of the main body column 152 is smaller than that of the back support 2, the main body column 152 is located at the center of the rear end of the back support 2, the lower end of the main body column 152 is fixedly connected with the seat 127, the upper end of the back support 2 is rotatably connected to the upper end of the main body column 152, the lower end of the back support 2 moves in an opening and closing manner relative to the main body column 152, and when the back support 2 opens forward, the lower end of the back support 2 approaches; when the back support 2 approaches the main body upright 152 backwards, the lower end of the back support 2 approaches the rear end of the seat 127; the support extension assembly 101 is connected at one end to a lower intermediate position of the main body upright 152 so as to be indirectly connected to the seat 127.

The distance between the joint of the back support 1 and the back support 2 and the lower end of the back support 2 is 50-60cm, so that the lower end of the back support 2 has a larger stroke along the seat depth direction when rotating.

As shown in fig. 21 and 22, a chair further comprises a bottom plate 128 and the seat depth adjusting mechanism, wherein the bottom plate 128 is fixedly connected to the bottom of the seat 127, and the lower end of the back support 1 is fixedly connected to the bottom plate 128.

Claims (16)

1. A seat depth adjusting mechanism is characterized by comprising:

a seat configured to support a human body to sit;

the chair back component is configured to support the waist and the back of a human body and is connected with the chair seat, the chair back component comprises a back support piece and a support telescopic component, the back support piece is rotatably arranged above the chair seat, one end of the support telescopic component is directly or indirectly connected with the chair seat, and the other end of the support telescopic component is connected with the back support piece; the support telescoping assembly is disposed behind the back support and is configured to telescope to cause the back support to rest in different positions above the seat.

2. The seat depth adjustment mechanism according to claim 1, wherein: the chair back component also comprises a back support, the lower end of the back support is fixedly connected with the chair seat, the back support comprises two lateral support rods which are bilaterally symmetrical and a top support rod connected to the upper ends of the lateral support rods, and a support seat is arranged at the rear end of the chair seat; the back support piece is arranged at the front side of the back support, the upper end of the back support piece is rotatably connected to the top support rod, the lower end of the back support piece moves relative to the back support in an opening and closing mode, and when the back support piece is opened forwards, the lower end of the back support piece approaches to the front end of the chair seat; when the back support piece approaches the back support frame backwards, the lower end of the back support piece approaches the rear end of the chair seat; one end of the supporting telescopic component is connected to the supporting seat.

3. The seat depth adjusting mechanism according to claim 2, wherein: the supporting seat is arranged in the middle of the rear end of the seat, and the supporting seat and the seat are integrally formed.

4. The seat depth adjustment mechanism according to claim 1, wherein: the chair back component also comprises a back support, the back support comprises a main body upright post, the width of the main body upright post is smaller than that of the back support, the main body upright post is positioned in the middle of the rear end of the back support, the lower end of the main body upright post is fixedly connected with the chair seat, the upper end of the back support is rotatably connected to the upper end of the main body upright post, the lower end of the back support moves in an opening and closing mode relative to the main body upright post, and when the back support is opened forwards; when the back support piece approaches the main body upright post backwards, the lower end of the back support piece approaches the rear end of the chair seat; one end of the supporting telescopic component is connected to the main body upright post.

5. The seat depth adjustment mechanism according to claim 4, wherein: the support telescopic component can be any one of an electric push rod, a pneumatic rod or a hydraulic rod, two ends of the support telescopic component are respectively connected with the back support and the back support in a rotating mode, and the inclination angle of the support telescopic component relative to the horizontal plane changes along with the opening and closing movement of the back support.

6. The seat depth adjustment mechanism according to claim 1, wherein: the support telescopic 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 member 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.

7. The seat depth adjustment mechanism according to claim 6, wherein: 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 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.

8. The seat depth adjustment mechanism according to claim 7, wherein: 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.

9. The seat depth adjustment mechanism according to claim 7, wherein: 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. The seat depth adjustment mechanism according to claim 9, wherein: at least one of the limiting piece and the locking tongue is an elastic piece.

11. The seat depth adjustment mechanism according to claim 7, wherein: 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 directly or indirectly connected with the seat in a rotating way, and the first supporting seat is connected with the back supporting piece in a rotating way.

12. The seat depth adjustment mechanism according to claim 7, wherein: 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. The seat depth adjustment mechanism according to claim 7, wherein: 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. The seat depth adjustment mechanism according to claim 4, wherein: from back to front, support flexible subassembly and be the slope of ramp up between back of the body support piece, when back of the body support piece lower extreme moved forward, support the whole contained angle with the horizontal plane of flexible subassembly and diminish.

15. The seat depth adjustment mechanism according to claim 4, wherein: the distance between the joint of the back support and the back support is 50-60cm from the lower end of the back support.

16. A seat, characterized by: comprising a chassis and a seat depth adjustment mechanism as claimed in any one of claims 1 to 15.

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