CN218474353U - Chair back lifting device - Google Patents

Abstract

The utility model provides a chair back lifting device, which comprises a supporting piece and a sliding seat; the supporting piece is connected with the chair seat, and the sliding seat is connected with the chair back; an adjusting mechanism is arranged between the sliding seat and the supporting piece, and comprises an adjusting rod, a resetting piece and a guiding part; the guide part comprises a tooth body and a circulating guide groove, the tooth body is provided with an oblique tooth socket, and the circulating guide groove comprises a lifting channel and a resetting channel; the free end of the adjusting rod is provided with a chuck clamped in the circulating guide groove, and the adjusting rod is made of rigid materials; the adjusting rod is in a vertical and upright state in a natural state, and swings to match the ascending or descending motion of the chair back; when the chair back is lifted, the adjusting rod deflects to enable the clamping head to enter the lifting channel, and the adjusting rod has a return trend under the action of the reset piece, so that the clamping head has a tendency of being clamped into the inclined tooth groove; when the chair back descends, the adjusting rod deflects reversely to enable the chuck to enter the reset channel, and the adjusting rod has the tendency of being restored to the natural state again under the action of the reset piece.

Description

Chair back lifting device

Technical Field

The utility model relates to a thing to sit on field, in particular to back of the chair elevating gear.

Background

The chair back of the chair is an important part for providing the supporting comfort level of a human body in a sitting posture state, and in order to effectively provide wider adaptability, the chair back is often configured to be adjustable in lifting so as to be adapted to the upper body height of different people in different sitting postures. The existing lifting adjusting mechanism generally adopts a friction fit or clamping fit mode, so that the adjustment of the chair back forms gear adjustment. The two gear adjusting modes are usually started in the adjusting process through structures such as an operation knob or a control switch; the structure is inconvenient to operate, one hand is needed to act on the control switch, and the other hand acts on the chair back to move upwards at the same time; and the adjusting structure has the problems of more complicated parts, more troublesome assembly, shorter service life, difficult maintenance of the function of long-term repeated adjustment, poor stability and the like.

CN201020217501.2, a chinese utility model patent, discloses a "chair back height adjusting device", which comprises a chair back connecting piece and a chair seat connecting piece. The chair back connecting piece is provided with a plurality of height selecting jacks which are mutually communicated, the chair seat connecting piece is provided with an installing jack and a clamping hole communicated with the installing jack, a height adjusting piece is inserted between the height selecting jack and the installing jack, one end of the height adjusting piece is buckled on the chair back connecting piece, and the other end of the height adjusting piece is buckled on the chair seat connecting piece. The utility model discloses a back of the chair connecting piece is provided with the altitude mixture control jack, the seat support connecting piece is provided with installation jack and the card solid hole, during the equipment altitude mixture control spare inserts earlier in installation jack and the altitude mixture control jack, then removes altitude mixture control spare makes altitude mixture control spare card is gone into the card is solid downthehole to realize back of the chair connecting piece and seat support connecting piece reliable connection, and then realize simple structure and the loading and unloading of being convenient for. The device is simple in structure and convenient to disassemble; however, when the height adjusting part is lifted and lowered, the height adjusting part still needs to be manually controlled to be clamped into the height selecting jack and the clamping and fixing hole, and the operation is inconvenient.

CN201821358814.2 discloses a chinese utility model discloses an "office chair back elevating system", including slide, locking piece recess and gear spout, the slide upper end is connected with the aluminium box, and the up end both sides of slide have seted up card strip recess, and card strip recess inboard installs card strip, the inside terminal surface under the slide is reserved to the locking piece recess, and is provided with the locking piece in the locking piece recess to the right side of locking piece recess is seted up flutedly, the right side of recess is reserved has the torsional spring recess, and installs the torsional spring in the torsional spring recess, the gear spout sets up the up end at the aluminium box. This office back lift adjustment mechanism adopts the TPU material that stereoplasm flexibility is strong, and the resistant bad performance is good, convenient to use and not fragile, and lift chair mechanism has adopted the open-ended of cockscomb structure to handle and can more effectual locking height when letting the locking piece promote height-adjusting from top to bottom, and the external design cockscomb structure also has certain pleasing to the eye effect. Although the patent adopts the serrated opening treatment, the multi-gear adjustment can be realized when the chair back is lifted; however, during each adjustment, the convex part at the upper end of the locking block still needs to be pushed to separate the convex part at the upper end of the locking block from the sawtooth-shaped part of the gear sliding groove, and then the aluminum box can be slid up and down to realize the lifting of the chair back, and the convex part still needs to be pushed manually by a user; and the structure is also comparatively loaded down with trivial details, and the installation is inconvenient.

CN201821868379.8 discloses a "quick reset structure of a lifting chair back", including the lifting chair back and mount, the lifting chair back is located the mount front end and with mount swing joint, the lifting chair back includes the chair back support, the chair back support rear surface is equipped with buckle, connecting plate, jump ring, torsional spring and slope, the mount front surface is equipped with the lift gear strip. The utility model discloses a quick reset structure of the lifting chair back has the advantages of visual operation, long service life and good stability. The structure can ensure that the chair back can be lifted by directly acting on the chair back without arranging a control switch, and when the chair back is lifted to the highest position, the ring-shaped spring is buckled into the slotted hole, so that the buckling part of the buckle is not contacted with the gear of the lifting gear strip, and the chair back can be lowered and reset; after the chair is lowered to a low point, the slope contact on the buckle is contacted with the slope bevel edge to realize the separation of the ring-shaped spring and the slotted hole and the return of the buckle, and the chair back can be shifted up again; however, the parts of the structure are too complex, the clamp spring and the torsion spring are arranged, the clamp spring structure also needs to be specially processed, and the installation and processing costs are high; when the chair is used, the buckle is clamped in the gear strip, the chair back bears most of load of a user, and the structural strength cannot be guaranteed; is easy to damage after long-term use.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide a chair back lifting device with simple structure and convenient operation, which comprises a sliding seat connected with the chair back and a supporting piece connected with the chair seat, wherein the sliding seat is arranged on the supporting piece in a sliding way; an adjusting mechanism is arranged between the sliding seat and the supporting piece, the adjusting mechanism is matched with the ascending or descending movement of the chair back through the swinging of the adjusting rod, and the resetting piece acts on the adjusting rod to enable the adjusting rod to have a return-to-positive trend after deflecting; the adjusting rod swings to drive the clamping head to circularly move in the circulating guide groove, so that the gear ascending adjustment of the chair back and the quick descending reset of the chair back are realized; the adjusting rod is made of rigid materials, so that the strength is high and the durability is high; the chair has the advantages of simple overall structure, ingenious design, no need of additionally arranging a control switch, capability of being adjusted by directly applying acting force to the chair back during operation, and convenience and quickness in operation.

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

the chair back lifting device comprises a longitudinal supporting piece and a sliding seat arranged on the supporting piece in a sliding way; the support member is configured to be coupled to a seat, and the slide mount is configured to be coupled to a seat back; an adjusting mechanism is arranged between the sliding seat and the supporting piece, and comprises an adjusting rod which is arranged on the sliding seat and can rotate left and right relative to the sliding seat, a resetting piece which acts on the adjusting rod to rotate and reset and a guiding part which is arranged on the supporting piece and used for guiding the adjusting rod to move; the guide part comprises a tooth body which is longitudinally arranged and a circulating guide groove which is arranged around the tooth body, a plurality of inclined teeth which are longitudinally arranged at intervals and extend obliquely upwards are arranged on the tooth body, an inclined tooth groove is formed between every two adjacent inclined teeth, and the circulating guide groove comprises a rising channel which is close to one side of the inclined tooth groove and a resetting channel which is positioned at the other side of the inclined tooth groove; the free end of the adjusting rod is provided with a chuck clamped in the circulating guide groove, and the adjusting rod is made of rigid material; the adjusting rod is in a vertical and upright state in a natural state, and swings to match the ascending or descending motion of the chair back; when the chair back is lifted, the adjusting rod deflects to enable the chuck to enter the lifting channel, and the adjusting rod has a return trend under the action of the reset piece, so that the chuck has a tendency of being clamped into the oblique tooth socket; when the chair back descends, the adjusting rod deflects reversely to enable the chuck to enter the reset channel, and the adjusting rod has the tendency of being restored to the natural state again under the action of the reset piece.

Preferably, the lower end of the adjusting rod is rotatably connected to the sliding seat; the piece that resets is connected on the sliding seat, and the piece that resets is including being located the elastic rod that adjusts pole both sides and vertical setting respectively, and when adjusting the pole horizontal rotation, elastic deformation takes place in order to provide the elasticity that the pole resets for the elastic rod. The elastic rods are arranged on the two sides of the adjusting rod, so that the adjusting rod always tends to return to the positive state again after deflecting.

Preferably, the adjustment lever is in a natural state, the single elastic lever is spaced apart from the adjustment lever, and a pressing block extending in a direction of the adjustment lever and abutting on the adjustment lever is provided at an end of the elastic lever. The elastic rod and the adjusting rod are spaced, so that the elastic rod can smoothly generate elastic deformation to a certain degree and provide proper elasticity; the end part of the elastic rod is provided with a pressing block attached to the adjusting rod, so that the elastic rod can deform under the action of the swinging of the adjusting rod, and the adjustment is rapid.

Preferably, the lower end of the adjusting rod is in rotating fit with the sliding seat through a rotating shaft; the reset piece comprises a base, a rotating shaft seat which is in rotating fit with the rotating shaft is arranged on the base, and the elastic rods are arranged on two sides of the rotating shaft seat; the rotating shaft at the lower end of the adjusting rod is matched in the rotating shaft seat in advance, and the adjusting rod and the reset piece are integrally and simultaneously arranged on the sliding seat. The adjusting rod and the reset piece are arranged on the sliding seat together, so that the installation steps are saved, and the installation is more convenient; and the pivot cooperation is on the pivot seat, and the skew takes place for the pivot can further be restricted to the pivot seat, avoids adjusting the pole and rocks.

Preferably, the rotating shaft seat comprises two terraces which are arranged in a mirror image manner and have 1/4 circular arcs, and the rotating shaft is lapped on the two terraces; and the rear end of the rotating shaft seat is provided with a baffle plate protruding upwards, and the adjusting rod is limited between the baffle plate and the sliding seat. When the adjusting rod deflects, the rotating shaft can be stabilized in the rotating shaft seat; and the baffle can restrict the adjusting rod from separating from the sliding seat.

Preferably, the sliding seat comprises a front seat and a rear seat which are folded back and forth, and the supporting piece is clamped and matched between the front seat and the rear seat in a sliding manner; the adjusting rod and the resetting piece are arranged inside the sliding seat. The adjusting mechanism can be hidden, so that the whole structure is simple and attractive.

Preferably, the adjusting rod and the resetting piece are connected to the front seat; the base is provided with a connecting pin and an elastic buckle, the front seat is correspondingly provided with a pin hole and a bayonet in clamping fit with the elastic buckle, and the elastic buckle is clamped in the bayonet to limit the reset piece from being separated from the front seat; and a shaft hole matched with the rotating shaft is also arranged on the front seat. The connection is convenient and quick, when the base is matched with the front seat, only the connecting pin needs to be arranged in the pin hole in a penetrating way, and then the elastic buckle is clamped into the bayonet; if the screw is adopted for connection, a screw hole needs to be arranged on the front seat, and the screw is easy to loosen after being used for a long time; comparatively speaking, adopt this connection structure to make to connect more fast, and connecting pin and elastic buckle respectively take its own roles, and elastic buckle plays joint fixed action, and the connecting pin can disperse the atress of junction, improves joint strength.

Preferably, the height of the elastic rod is between 1/3 and 1/2 of the height of the adjusting rod.

Preferably, the adjusting rod is made of metal, and the elastic rod is made of elastic plastic. The adjusting rod is made of metal materials, so that the adjusting rod has higher strength and ensures that the chair back is lifted stably; the elastic rod is made of plastic materials, and cost can be reduced.

Preferably, a sliding guide mechanism is further arranged between the sliding seat and the supporting piece, and the sliding guide mechanism comprises a guide groove arranged on one of the sliding seat or the supporting piece and a guide block correspondingly arranged on the other of the sliding seat or the supporting piece. The sliding between the sliding seat and the supporting piece is smoother, and the lifting effect of the chair back is better.

Preferably, in the process of returning the chair back downwards, the guide block is in advance abutted with the lower end of the guide groove to limit the collision of the clamping head with the bottom groove wall of the circulating guide groove. When the chair back resets fast, the chuck is prevented from being damaged due to the fact that the chuck collides with the bottom groove wall of the circulating guide groove, and the service life is prolonged.

Preferably, the upper end of the ascending channel is higher than the upper end of the resetting channel; the lower end of the ascending channel is higher than the lower end of the resetting channel. So that the chuck will automatically move downwards into the reset channel when reset.

Preferably, the tooth body comprises a plurality of inclined teeth extending obliquely upwards, and the inclined tooth slot is formed between two adjacent inclined teeth. The inclined tooth groove is obliquely arranged upwards, and under the action of gravity, the clamping head is abutted against the bottom of the inclined tooth groove so that the chair back can stably stay at the adjusting height in the use state of the chair back.

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

1, the chair back lifting device adapts to the lifting or descending motion of the chair back by the swinging of the adjusting rod, and the swinging of the adjusting rod drives the chuck to circularly move in the circulating guide groove, thereby realizing the gear lifting adjustment of the chair back and the quick descending reset of the chair back; the structure is ingenious; no additional control switch is needed, the structure is simplified integrally, and the installation steps are simple; and when the chair is adjusted, the chair back can be adjusted to lift by directly applying upward or downward acting force to the chair back, and the operation is very convenient and practical.

2, in the structure, the chair back can be adjusted in multiple steps by only arranging the adjusting rod and the resetting piece; the adjusting rod is made of metal, so that the strength is high, the load applied by the back of a user can be effectively borne, and the stability of the device is ensured; the elastic rod is made of elastic plastic materials, can effectively act on the adjusting rod to rotate and reset, and is low in cost; compared with some lifting and sliding mechanisms provided with tension springs, steel sheets and pressing plates in the prior art, the whole mechanism is simplified undoubtedly, and the production and processing cost is greatly reduced.

3, an interval is reserved between the elastic rod and the adjusting rod, so that the elastic rod can be smoothly elastically deformed to a certain degree, and proper elastic force is provided; the end part of the elastic rod is provided with a pressing block attached to the adjusting rod, so that the elastic rod can deform under the action of the swinging of the adjusting rod, the adjustment is rapid, and the response is sensitive; and moreover, the base is provided with the rotating shaft seat and the baffle, so that after the adjusting rod is in running fit with the sliding seat, the rotating shaft seat machine baffle can limit the rotating shaft to deviate in the front-back direction and the left-right direction, and the adjusting rod can rotate more stably.

4, the sliding guide mechanism is arranged, so that the sliding seat can slide smoothly relative to the supporting piece, and the adjusting effect is better; and when the chair back descends and resets, the guide block abuts against the lower end of the guide groove in a first step to limit the clamping head from abutting against and colliding with the lower end of the circulating guide groove, so that the clamping head is prevented from being damaged, the service life of the device is further prolonged, and consideration is given.

5, the adjusting rod is arranged inside the sliding seat, and the sliding seat is sleeved on the supporting piece in a sliding manner; so that most of the adjusting mechanism is hidden in the sliding seat; can eliminate the connecting trace, so that the whole body is simple and beautiful, and meets the modern aesthetic requirements.

Drawings

FIG. 1 is a schematic perspective view of the connection between the chair back and the chair seat according to the embodiment of the present invention;

fig. 2 is a schematic perspective view illustrating the sliding seat slidably connected to the supporting member according to the embodiment of the present invention;

fig. 3 is a schematic perspective view of the sliding seat and the supporting member according to the embodiment of the present invention;

fig. 4 is a schematic internal three-dimensional structure of the sliding seat according to the embodiment of the present invention;

fig. 5 is a schematic perspective view of the adjusting lever and the reset member of the embodiment of the present invention;

fig. 6 is a schematic perspective view of an adjusting lever and a reset member according to an embodiment of the present invention;

fig. 7 is a schematic perspective view of a guide portion according to an embodiment of the present invention;

fig. 8 is a schematic three-dimensional structure diagram of the adjusting rod in the natural state according to the embodiment of the present invention;

fig. 9 is a schematic perspective view of the embodiment of the present invention when the chuck of the adjusting lever is located in the ascending channel;

fig. 10 is a schematic perspective view illustrating the position of the adjusting rod when the chuck enters the reset passage according to the embodiment of the present invention.

The figures are numbered: a support 1; a sliding seat 2; a front seat 2a; a rear seat 2b; a chair seat A; a chair back B; an adjusting lever 3; a reset member 4; a guide part 5; a tooth body 6; a circulating guide groove 7; an oblique gullet 8; a rising channel 9; a reset channel 10; a chuck 11; a containing groove 12; a rotating shaft 13; a shaft hole 14; a base 15; an elastic rod 16; a pressing block 16a; a rotating shaft seat 17; the landings 17a; a connecting pin 18; an elastic buckle 19; a pin hole 20; a bayonet 21; a baffle 22; helical teeth 23; a guide groove 24; and a guide block 25.

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 present embodiment is described with reference to the orientation of the various components, such as front, rear, etc., in a normal use condition with the user seated in the seat.

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

as shown in fig. 1-10, the present invention provides a chair back lifting device, which comprises a supporting member 1 disposed longitudinally and a sliding seat 2 slidably disposed on the supporting member 1; the supporting piece 1 is configured to be fixedly connected to the seat A, the sliding seat 2 is configured to be fixedly connected to the chair back B, and then the sliding seat 2 acts on the supporting piece 1 to slide up and down so as to control the chair back to lift; an adjusting mechanism is arranged between the sliding seat 2 and the supporting piece 1, and comprises an adjusting rod 3 which is arranged on the sliding seat 2 and can rotate left and right relative to the sliding seat 2, a resetting piece 4 which acts on the adjusting rod 3 to rotate and reset and a guiding part 5 which is arranged on the supporting piece 1 and is used for guiding the adjusting rod 3 to move; the guide part 5 comprises a tooth body 6 arranged longitudinally and a circulating guide groove 7 arranged around the tooth body 6, the tooth body 6 is provided with oblique tooth grooves 8 arranged longitudinally at intervals, and the circulating guide groove 7 comprises a rising channel 9 close to one side of the oblique tooth grooves 8 and a resetting channel 10 positioned at the other side; the free end of the adjusting rod 3 is provided with a chuck 11 embedded in the circulating guide groove 7; then the adjusting rod 3 deflects to drive the chuck 11 to move in the circulating guide groove 7, so that the ascending and descending movement of the chair back is matched; when the chair back B is lifted and adjusted, the adjusting rod 3 deflects to enable the chuck 11 to enter the lifting channel 9 to move upwards and be sequentially clamped with the oblique tooth grooves 8 under the action of the resetting piece 4, so that the chair back B has a plurality of adjusting gears in the lifting process, and the adjustment is more accurate; when the chair back B resets, the adjusting rod 3 reversely deflects to enable the chuck 11 to enter the resetting channel 10 from the ascending channel 9 and move downwards along the resetting channel 10 to reset the chair back B, so that the chair back B can be quickly reset, and the operation is convenient; then, by adopting the chair back lifting device, the structure is simplified, a control switch is not required to be arranged, and the adjustment is more convenient and faster.

As shown in fig. 1-4, the support member 1 is shown as a longitudinally arranged plate-like structure, and the guide portion 5 is arranged on the front end face of the support member 1; the sliding seat 2 comprises a front seat 2a and a rear seat 2b which are butted together in front and back, and an accommodating groove 12 which penetrates through the front seat 2a and the rear seat 2b is formed after the front seat 2a and the rear seat 2b are butted together; the sliding seat 2 is arranged in the containing groove 12 in a penetrating way, and the sliding seat 2 is clamped and matched between the front seat 2a and the rear seat 2b in a sliding way; when the chair back B is adjusted up and down, the sliding seat 2 slides up and down along the length direction of the support 1.

As shown in fig. 2 to 7, the adjusting rod 3 is disposed inside the sliding seat 2, and a lower end of the adjusting rod 3 is rotatably connected to the front seat 2a, the adjusting rod 3 is a long bar-shaped rod, a rotating shaft 13 protruding forward is disposed at a lower end of the adjusting rod 3, a shaft hole 14 is disposed at a corresponding position of the front seat 2a, and the rotating shaft 13 is disposed in the shaft hole 14 in a penetrating manner so that the adjusting rod 3 can rotate in a left-right direction relative to the front seat 2 a. The resetting piece 4 is also connected to the front seat 2a, and the resetting piece 4 can act on the adjusting rod 3 to reset after rotating and can limit the deviation of the adjusting rod 3; specifically, the method comprises the following steps: the reset piece 4 comprises a base 15 positioned at the lower end and connected with the front seat 2, a rotating shaft seat 17 arranged on the base 15 and rotationally matched with the rotating shaft 13 at the lower end of the adjusting rod 3, and elastic rods 16 arranged at two sides of the rotating shaft seat 17 in the longitudinal direction; as shown in fig. 4-6, the rotating shaft seat 17 is disposed at the middle position of the upper end of the base 15, the rotating shaft seat 17 includes two terraces 17a with 1/4 circular arc in mirror image arrangement, during installation, the rotating shaft 13 is lapped on the two terraces 17a, so that the rotating shaft 13 is restricted on the rotating shaft seat 17, and after the rotating shaft 13 is matched with the shaft hole 14, the rotating shaft 13 is prevented from shifting due to the gap, and the adjusting rod 3 is more stable to rotate. The elastic rod 16 extends upwards along the bottom of the adjusting rod 3, wherein when the adjusting rod 3 is in a natural state, a gap exists between the single elastic rod 16 and the adjusting rod 3, and a pressing block 16a which extends towards the adjusting rod 2 and is attached to the adjusting rod is arranged at the end of the elastic rod 16. An interval is formed between the elastic rod 16 and the adjusting rod 3, so that when the adjusting rod 3 swings, the elastic rod 16 can smoothly generate elastic deformation to a certain degree, and proper reset elastic force is provided; the end of the elastic rod 16 is provided with a pressing block 16a attached to the adjusting rod 3, so that the elastic rod 16 can be deformed by the swinging of the adjusting rod 3, the adjustment is rapid, and the response is sensitive, in the embodiment, the length of the elastic rod 16 is 1/2 of that of the adjusting rod 3; the adjusting rod 3a is made of metal and has high strength, and the elastic rod 16 is made of elastic plastic, so that the cost can be saved; under the elastic force of the elastic rod 16, the adjusting rod 3a always has the tendency of resetting and centering after rotating left and right.

As shown in fig. 3 to 6, the connection between the adjusting lever 3 and the base 15 and the front seat 2a is as follows: the base 15 is provided with a connecting pin 18 and an elastic buckle 19, and the front seat 2a is correspondingly provided with a pin hole 20 and a bayonet 21; during assembly, the rotating shaft 13 at the lower end of the adjusting rod 3 is matched on the rotating shaft seat 17 on the base 15 in advance, and then the adjusting rod 3 and the base 15 are connected on the front seat 2a together; the specific connection mode is as follows: the rotating shaft 13 is arranged in the shaft hole 14 in a penetrating manner, the connecting pin 18 is inserted into the pin hole 20, then the elastic buckle 19 is clamped into the bayonet 21 to limit the reset piece 4 to be separated from the front seat 2a, and the reset piece 4 is fixedly connected with the front seat 2a; as shown in fig. 5, a baffle plate 22 protruding upward is further provided at the rear end of the rotary shaft base 17, and the adjusting rod 3 is restricted between the front seat 2a and the baffle plate 22 to restrict the adjusting rod 3 from shifting forward and backward; to sum up, with the adoption of the connecting structure, after the adjusting rod 3 is rotatably connected to the front seat 2a, the adjusting rod 3 can only rotate in the left-right direction relative to the front seat 2 a. In addition, the reset piece 4 is connected with the front seat 2 in a clamping manner, so that the connection is convenient and quick, if a screw is adopted, a screw hole needs to be formed in the front seat 2a, and the screw is easy to loosen after being used for a long time; the process is more complicated.

As shown in fig. 3 and 7, the tooth body 6 is elongated, the tooth body 6 includes a plurality of inclined teeth 23 arranged at intervals longitudinally, the inclined tooth slot 8 is formed between two adjacent inclined teeth 23, and the inclined teeth 23 extend and incline upwards; the circulating guide groove 7 is a circle of sliding groove arranged around the tooth body 6, wherein the ascending channel 9 is positioned at one side close to the skewed tooth grooves 8, and the ascending channel 9 is communicated with each skewed tooth groove 8; the reset channel 10 is positioned at the other side of the tooth body 6, and the ascending channel 9 and the reset channel 10 are vertical straight grooves; the lower end of the ascending channel 9 is higher than the lower end of the resetting channel 10, and the upper end of the ascending channel 9 is higher than the lower end of the resetting channel 10; a chuck 11 clamped in the circulating guide groove 7 is arranged at the free end (namely the upper end) of the adjusting rod 3a, and the chuck 11 can circularly move in the circulating guide groove 7; then, the chair back B can be shifted up and returned to the seat a by the adjustment lever 3 and the guide portion 5.

As shown in fig. 8 to 10, the process of adjusting the lifting of the chair back B is as follows: as shown in fig. 8, under the user state, 11 joints of dop in skewed tooth's socket 8, adjusting pole 3 and being in vertical just putting state, and when the user used, can apply for the decurrent effort of the back of the chair, dop 11 will be downward with the inseparable joint of skewed tooth's socket 8, back of the chair B can be used stably under this height. As shown in fig. 9, when the chair back B needs to be adjusted to ascend, the chair back B is only needed to be grasped and pulled upwards, the chuck 11 is about to move upwards along the oblique direction of the oblique tooth groove 7, and the adjusting rod 3 deflects and enables the chuck 11 to enter the ascending channel 9; under the elastic action of the elastic rod 16, the adjusting rod 3 always tends to deflect and return to the positive direction, then the chair back B continues to be pulled upwards, the chuck 11 moves upwards along the ascending channel 9 and is clamped with each oblique tooth groove 8 upwards in sequence, and then the chair back B can be shifted upwards to be adjusted and can stay at different heights; in the process of rising, the adjusting rod 3 continuously acts on the elastic deformation of the elastic rod 16, so that the adjusting has good damping hand feeling, and the adjusting effect is better. As shown in fig. 10, when the chair back B needs to be reset, the chair back B is controlled to move upwards to enable the chuck 11 to move to the uppermost end of the ascending channel, the adjusting rod 3 is corrected again, and because the upper end of the ascending channel 9 is higher than the upper end of the resetting channel 10, when the chair back B descends under the action, the adjusting rod 3 deflects reversely to enable the chuck 11 to enter the resetting channel 10, the resetting channel 10 is a vertically arranged straight groove, at the moment, the chair back B can be directly acted on to quickly descend and reset, the chuck 11 directly slides downwards along the resetting channel 10, and the adjusting rod 3 still receives the elastic action of the elastic rod 16 on the other side in the sliding process, so that the good damping hand feeling can be still kept in the sliding process; when the chuck 11 moves to the lowest end of the reset groove 12, the chuck 11 will restore to the natural state again under the elastic force of the elastic rod 16, and the chair back B is at the lowest height at this time; the lower end of the ascending channel 9 is higher than the lower end of the resetting channel 10, so that the clamp head 11 can enter the ascending channel 9 only when acting force is applied to the chair back B again; in conclusion, the adjusting rod 3 swings to enable the chuck 11 to circularly move for one circle in the circulating guide groove 7, so that the gear ascending adjustment and the rapid descending reset of the chair back B can be realized; in the adjusting process, the chair back B can be directly acted on to ascend and descend without additionally arranging parts such as a control switch, a torsion spring or a pressure spring and the like, so that the structure is very simple, and the operation is very convenient and fast; moreover, the adjusting rod 3 and the guiding part 5 are both hidden between the supporting part 1 and the sliding seat 2, so that connecting traces are effectively eliminated, and the whole structure is simpler and more attractive.

Further, still be equipped with slip guiding mechanism between sliding seat 2 and support piece 1 for the lift of sliding seat 2 relative support piece 1 is more smooth and easy, specific saying so: as shown in fig. 3 and 4, the slide guide mechanism includes a guide groove 24 provided on the support 1 and a guide block 25 provided on the front seat 2a and projecting rearward on the guide groove 24; wherein, the guide grooves 24 are arranged at the left side and the right side of the guide part 5 in a mirror image manner, and the guide block 25 slides along the guide grooves 24 in the lifting process of the chair back B, so that the adjusting effect is better; furthermore, another important point of the design is: when the chuck 11 slides to the lowest end of the reset channel 10 and the adjusting rod 3 is in a return state, the guide block 25 is abutted with the lower end of the guide groove 24 in one step to limit the chuck 11 from abutting and colliding with the bottom groove wall of the circulating guide groove 7, so that the chuck 11 is prevented from being damaged; the clamping head 11 can be effectively protected, and the service life of the clamping head 11 is prolonged; making the device more durable.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims (12)

1. Back of the chair elevating gear, its characterized in that: comprises a longitudinal supporting piece and a sliding seat arranged on the supporting piece in a sliding way; the support member is configured to be connected with a seat, and the sliding seat is configured to be connected with a chair back; an adjusting mechanism is arranged between the sliding seat and the supporting piece, and comprises an adjusting rod which is arranged on the sliding seat and can rotate left and right relative to the sliding seat, a resetting piece which acts on the adjusting rod to rotate and reset and a guiding part which is arranged on the supporting piece and used for guiding the adjusting rod to move; the guide part comprises a tooth body which is longitudinally arranged and a circulating guide groove which is arranged around the tooth body, a plurality of inclined teeth which are longitudinally arranged at intervals and extend obliquely upwards are arranged on the tooth body, an inclined tooth groove is formed between every two adjacent inclined teeth, and the circulating guide groove comprises a rising channel which is close to one side of the inclined tooth groove and a resetting channel which is positioned at the other side of the inclined tooth groove; the free end of the adjusting rod is provided with a chuck clamped in the circulating guide groove, and the adjusting rod is made of rigid material; the adjusting rod is in a vertical and upright state in a natural state, and swings to match the ascending or descending motion of the chair back; when the chair back is lifted, the adjusting rod deflects to enable the chuck to enter the lifting channel, and the adjusting rod has a return trend under the action of the reset piece, so that the chuck has a tendency of being clamped into the oblique tooth socket; when the chair back descends, the adjusting rod deflects reversely to enable the chuck to enter the reset channel, and the adjusting rod has the tendency of being restored to the natural state again under the action of the reset piece.

2. The chair back lifting device of claim 1, wherein: the lower end of the adjusting rod is rotatably connected to the sliding seat; the piece that resets is connected on the sliding seat, and the piece that resets is including being located the elastic rod that adjusts pole both sides and vertical setting respectively, and when adjusting the pole horizontal rotation, elastic deformation takes place in order to provide the elasticity that the pole resets for the elastic rod.

3. The chair back lifting device of claim 2, wherein: the adjusting rod is in a natural state, a gap exists between the elastic rod and the adjusting rod, and a pressing block which extends towards the direction of the adjusting rod and is attached to the adjusting rod is arranged at the end part of the elastic rod.

4. The chair back lifting device of claim 2, wherein: the lower end of the adjusting rod is in rotating fit with the sliding seat through a rotating shaft; the reset piece comprises a base, a rotating shaft seat which is in rotating fit with the rotating shaft is arranged on the base, and the elastic rods are arranged on two sides of the rotating shaft seat; the rotating shaft at the lower end of the adjusting rod is matched in the rotating shaft seat in advance, and the adjusting rod and the reset piece are integrally and simultaneously arranged on the sliding seat.

5. The chair back lifting device of claim 4, wherein: the rotating shaft seat comprises two terraces which are arranged in a mirror image mode and provided with 1/4 circular arcs, and the rotating shaft is lapped on the two terraces; and the rear end of the rotating shaft seat is provided with a baffle plate protruding upwards, and the adjusting rod is limited between the baffle plate and the sliding seat.

6. The chair back lifting device of claim 4, wherein: the sliding seat comprises a front seat and a rear seat which are folded back and forth, and the supporting piece is clamped and matched between the front seat and the rear seat in a sliding manner; the adjusting rod and the resetting piece are arranged inside the sliding seat.

7. The chair back lifting device of claim 6, wherein: the adjusting rod and the resetting piece are connected on the front seat; the base is provided with a connecting pin and an elastic buckle, the front seat is correspondingly provided with a pin hole and a bayonet in clamping fit with the elastic buckle, and the elastic buckle is clamped in the bayonet to limit the reset piece from being separated from the front seat; and a shaft hole matched with the rotating shaft is also arranged on the front seat.

8. The chair back lifting device of claim 2, wherein: the height of the elastic rod is between 1/3 and 1/2 of the height of the adjusting rod.

9. The chair back lifting device of claim 2, wherein: the adjusting rod is made of metal, and the elastic rod is made of elastic plastic.

10. The chair back lifting device of claim 1, wherein: a sliding guide mechanism is further arranged between the sliding seat and the supporting piece, and the sliding guide mechanism comprises a guide groove arranged on one of the sliding seat or the supporting piece and a guide block correspondingly arranged on the other of the sliding seat or the supporting piece.

11. The chair back lifting device of claim 10, wherein: in the downward resetting process of the chair back, the guide block is abutted with the lower end of the guide groove in advance to limit the collision of the clamping head and the bottom groove wall of the circulating guide groove.

12. The chair back lifting device of claim 1, wherein: the upper end of the ascending channel is higher than the upper end of the resetting channel; the lower end of the ascending channel is higher than the lower end of the resetting channel.

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