CN115413902A - Waist of chair leans on adjusting device and chair - Google Patents

Abstract

The invention provides a waist rest adjusting device of a chair and the chair, comprising a waist rest support piece and a back support piece; the waist support is provided with a first connecting arm and a second connecting arm; the first connecting arm is hinged with the upper rotating seat of the back support piece; the second connecting arm is hinged with the rotary supporting arm; a sliding adjusting piece is arranged in the back supporting piece in a sliding manner, and the rear end of the rotating supporting arm is hinged with the sliding adjusting piece; the gear circulating assembly comprises a rotating gear, an elastic piece and a gear connecting part; the rotating tooth piece is provided with inverted teeth extending towards the outer side, and the tooth connection part comprises inverted tooth grooves; the sliding adjusting piece moves upwards to enable the inverted teeth of the rotating tooth piece to be in tooth joint with the inverted tooth grooves in sequence; a positioning tooth and a positioning notch are arranged between the sliding adjusting piece and the rotating tooth piece, and the sliding adjusting piece moves upwards to the position tooth to be in toothed connection with the positioning notch so that the rotating tooth piece is positioned in a reset state; the sliding fit part is provided with a reset top tooth; when the sliding adjusting piece moves downwards for resetting, the reset top teeth extrude and act on the rotating gear piece to enable the positioning teeth to be separated from the positioning notches, and the rotating gear piece deflects for resetting.

Description

Waist of chair leans on adjusting device and chair

Technical Field

The invention relates to the field of seats, in particular to a waist rest adjusting device of a chair and the chair.

Background

The waist rest of the seat is an important part for providing the supporting comfort level of a human body in a sitting posture state, and is configured to be adjustable in front-back depth to meet the waist supporting requirements of different people in sitting postures; however, currently available lumbar adjustment mechanisms on some seats generally have drawbacks.

The utility model discloses a "be applied to waist on office chair and lean on adjusting device" as CN202122877140.5 includes that the waist leans on and the mount pad, the waist leans on and is connected through adjusting device between the mount pad, adjusting device is including being used for the waist to lean on the front and back adjustment mechanism who carries out front and back position control and being used for the waist to lean on the upper and lower adjustment mechanism who carries out position control from top to bottom, front and back adjustment mechanism installs in the mount pad, adjustment mechanism about the action end connection of front and back adjustment mechanism, the waist is leaned on to be connected to upper and lower adjustment mechanism's action end, be equipped with between waist and the mount pad and be used for user's hand to stretch into the operation zone that adjustment mechanism carries out position control around the waist leans on, the simple structure that the waist leaned on, easy and simple operation only need twist adjust knob and promote the waist from top to bottom and lean on, can realize the front and back position control and the upper and lower position control of waist by the waist, can adapt to the crowd of different sizes and use. The waist rest adjusting device adopts a mode of rotating an adjusting knob to adjust the front and back positions of the waist rest, and the adjusting knob is positioned between the seat backrest and the waist rest; when a person sits on the chair, the hand needs to extend backwards to the part between the waist rest and the backrest for adjustment, the moving space of the hand is limited, and the operation is very inconvenient. For children, old people and people with inconvenient joint movement, the adjustment can be carried out even if the old people need to leave the seat.

CN 201920198823.8's utility model patent discloses a "waist leans on with lift adjustment function around having", including the back of the body frame with locate the erection column on the back of the body frame, the erection column both sides are equipped with the spacing hole of knob, install the installation backplate before the erection column, install the function board that can move about from top to bottom before the installation backplate, the function board rear side is equipped with lifting rack, movably inlays in the function board and is equipped with the stay wire end fixed plate, stay wire end fixed plate bottom is connected with the waist and leans on the bottom plate, the waist leans on bottom plate upper end and function board upper end contact. The waist support with the functions of front-back adjustment and lifting adjustment, disclosed by the invention, has the advantages of simple structure and simplicity and convenience in operation, and can realize front-back adjustment and lifting adjustment of the waist support so as to meet the requirements of different people. The waist support can conveniently act on the adjusting knob to adjust the position of the waist support; however, the structure is too complex, and the structures such as a pull wire, a gear, a rack and the like are adopted, so that more and more parts are used for controlling and adjusting, and the occupied space is larger undoubtedly; the beauty of the seat is seriously affected, and meanwhile, the switch is damaged, so that the seat looks higher, but the simple things are more complicated, the interaction condition between the seat and a user in the actual use of the product is not considered, and the seat is not in accordance with the human engineering.

Therefore, in order to solve the above problems, the present invention provides a design that is convenient for a user to operate at will and can adjust the front and back positions of the waist support without a switch.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a waist rest adjusting device of a chair, which has simple structure and convenient operation; the waist support piece rotates forwards and backwards to drive the sliding adjusting piece to slide up and down; the sliding adjusting piece can move up and down to reset in the sliding matching part in a reciprocating mode; so that the lumbar support can rotate forwards around the upper rotating seat in a reciprocating manner and reset backwards again; in the adjusting operation process, a user only needs to directly grasp the waist support and apply acting force to the waist support without any other switch; the adjustment is simpler and more convenient, and the feeling of high grade is better.

Still further, a chair using the waist rest adjusting device is provided.

The technical scheme of the invention is realized as follows:

a lumbar support adjustment device for a chair, comprising: a lumbar support member disposed on the back support member; the back end of the waist support is provided with a first connecting arm and a second connecting arm which extend backwards; the back support is provided with an upper rotating seat, and the first connecting arm is hinged with the upper rotating seat; a rotary support arm disposed between the second link arm and the back support; the front end of the rotary supporting arm is hinged with the second connecting arm; the back support piece is positioned below the upper rotating seat and is provided with a sliding fit part, and the rear end of the rotating support arm is connected to the sliding fit part; the sliding adjusting piece is arranged in the sliding matching part; the sliding adjusting piece can slide up and down along the back supporting piece; the sliding adjusting piece is provided with a lower rotating base, and the rear end of the rotating supporting arm is hinged on the lower rotating base; the sliding adjusting piece can correspondingly slide up and down along the sliding matching part in response to the back and forth rotating action of the waist support piece around the upper rotating seat through rotating the supporting arm; the gear circulating assembly is arranged between the sliding adjusting piece and the sliding matching part; the gear circulating mechanism comprises a rotating gear piece, an elastic piece and longitudinal tooth connection parts, wherein the left mirror image and the right mirror image of the rotating gear piece are arranged on the sliding adjusting piece; each rotating tooth member is provided with a pawl extending outwards, and the tooth connection part comprises at least two longitudinally spaced pawl grooves; in the process that the sliding adjusting piece moves upwards, the rotating tooth piece deflects towards the inner side and moves upwards to be separated from the inverted tooth groove, and the rotating tooth piece deflects towards the outer side again under the action of the elastic piece and is in tooth joint with the inverted tooth groove at the corresponding position; the rotating gear piece is also provided with a reset state which enables the sliding adjusting piece to move downwards for resetting; a telescopic lug which can elastically stretch and retract longitudinally is arranged at the upper end of each rotating tooth part of the sliding adjusting part, one of the telescopic lug and the rotating tooth part is provided with a positioning tooth, and the other of the telescopic lug and the rotating tooth part is provided with a positioning notch; the upper end of the tooth connecting part on each side is provided with an inner convex tooth protruding towards the rotating tooth part; in a reset state, the sliding adjusting piece moves upwards to the inner convex tooth to act on the rotating tooth pieces to deflect towards the inner side, so that the positioning teeth are clamped with the positioning notches, and the lower ends of the two rotating tooth pieces are attached together; the inverted teeth of each rotating tooth piece are staggered with the inward convex teeth on the corresponding side left and right; a reset top tooth is also arranged at the middle position of the lower part of the sliding fit part; when the sliding adjusting piece moves downwards for resetting, the resetting top tooth can extrude upwards to act on the two rotating tooth pieces to generate deviation movement, and each rotating tooth piece deflects towards the outer side to enable the positioning tooth to be separated from the positioning notch; the elastic component extrusion acts on the rotating tooth component to enable the inverted tooth to reset to the bottom end of the tooth connection part.

Preferably, the sliding adjusting piece is of a rectangular structure, and two movable caulking grooves used for connecting the rotating gear piece are arranged in the middle of the sliding adjusting piece in a mirror image mode; a rotating shaft is arranged in each movable caulking groove, and a shaft hole is formed in each rotating gear; the rotating gear is embedded in the movable embedded groove and enables the rotating shaft to rotatably penetrate through the shaft hole. So that the rotating tooth element can only deflect inwards and outwards in the sliding adjusting element.

Preferably, the elastic element is a spring transversely arranged between the two rotating tooth elements; two ends of the spring are respectively arranged in the rotating tooth part in a penetrating way; the resilient member is configured such that each rotating tooth always has a tendency to rotate outwardly to cause the tooth to engage the tooth in the tooth-engaging engagement with the tooth-chamfering groove. Make the spring can be used for all the time and rotate the outside deflection of tooth spare for the pawl that rotates the tooth spare can stabilize the joint in the tooth's socket of falling.

Preferably, in the reset state, a notch which is concave upwards is formed between the lower ends of the two rotating tooth pieces; the reset top tooth can be propped upwards in the notch. Make two rotation tooth parts of the top tooth that resets can effectual extrusion effect break away from each other upwards.

Preferably, the rear end of the sliding adjusting part is concavely provided with a longitudinal avoidance groove for avoiding the reset top tooth, and the upper end of the avoidance groove penetrates through the sliding adjusting part from front to back; under the reset state, the bottom junction of the two rotating tooth parts can be exposed out of the upper end of the avoidance groove. In the reset state, the sliding adjusting piece resets downwards, the reset top tooth can just be in extrusion contact with the rotating tooth piece, and the structural design is ingenious; and the sliding adjusting piece rises, and the reset top tooth moves in the avoiding groove, so that interference between structures can not occur.

Preferably, the end of the inner convex tooth approaches the side end of the sliding adjusting piece; in the lifting process of the sliding adjusting piece, the inverted teeth outwards protrude out of the side end of the sliding adjusting piece; in the reset state, the rotating tooth piece rotates inwards to contract so that the end part of the inverted tooth does not protrude out of the side end of the sliding adjusting piece. When the reset is performed, the inner convex teeth can more effectively act on the rotating gear piece to rotate; in the reset state, the end part of the inverted tooth does not protrude out of the side end of the sliding adjusting piece, and the inverted tooth and the inner convex tooth do not interfere with each other, so that the sliding adjusting piece can move downwards to reset.

Preferably, the inverted tooth is in a triangular structure protruding outwards, and the shape of the inverted tooth groove is matched with the shape of the tip of the inverted tooth; and the inverted tooth is provided with a bevel edge which is in extrusion fit with the groove wall of the inverted tooth groove and the inner convex tooth.

Preferably, the sliding fit part is concavely provided with a rectangular mounting groove, and a fixed seat is embedded and fixedly arranged in the mounting groove; the middle part of the fixed seat is provided with a containing groove for containing the sliding adjusting piece; the sliding adjusting piece is in sliding fit in the accommodating groove; the tooth parts are arranged on two sides of the fixed seat in a mirror image manner; the reset top tooth is arranged at the middle position of the lower part of the fixed seat. So that the mounting groove is only needed to be arranged on the back support piece; the fixed seat is matched with the sliding adjusting piece and then embedded in the mounting groove; the processing and the assembly are convenient.

Preferably, a longitudinal guide groove is concavely arranged at the back end of the sliding adjusting piece, and a guide strip protruding forwards is correspondingly arranged in the accommodating groove; the sliding adjusting piece is embedded in the accommodating groove and enables the guide strip to be in sliding fit with the guide groove. So that the sliding adjusting piece can stably slide up and down relative to the back support piece.

Preferably, the sliding fit portion further comprises a cover plate arranged at the front end, the lower rotating base is arranged at the lower end of the sliding adjusting piece and protrudes forwards from the cover plate, and a vertical groove for avoiding the lower rotating base is correspondingly formed in the cover plate. The connecting trace can be hidden, the structure is attractive, and the lower rotating seat protrudes forwards from the front end of the cover plate, so that the connection is convenient.

Preferably, the upper end of each rotating tooth part is provided with an arc convex part protruding upwards at a position close to the center of the sliding adjusting part, and the positioning notch is arranged on the arc convex part; the positioning teeth are correspondingly arranged at the bottom ends of the telescopic lugs; the sliding adjusting piece is provided with a longitudinal connecting spring for acting the elastic expansion of the expansion convex block. The location tooth can be with the locking piece locking that rotates in the state that resets with the location breach cooperation, and because flexible lug can vertically stretch out and draw back for under the exogenic action, rotate the locking piece and can deflect so that location tooth breaks away from with the location breach.

Preferably, a limiting mechanism is arranged between the rotating gear and the sliding adjusting piece, and comprises a limiting protrusion arranged on one of the rotating gear or the sliding adjusting piece and an arc-shaped limiting groove correspondingly arranged on the other of the rotating gear or the sliding adjusting piece.

Preferably, the rotatable support arm and the second link arm tend to be in a straight line when the sliding adjustment member is in the lowermost position. When the waist support piece rotates forwards, the force transmission effect between the second connecting arm and the rotating support arm is good, and the sliding adjusting piece can be driven to move upwards more easily.

Preferably, the lumbar support is of an arc structure protruding forwards, and the first connecting arm and the second connecting arm are both arranged at the middle position of the rear upper end of the lumbar support. So that the waist support piece rotates around the upper rotating seat to realize the front-back depth adjustment.

A chair comprises the waist rest adjusting device of the chair.

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

the waist support adjusting device of the chair can adjust the front-back depth of the waist support by acting the waist support to rotate around the upper rotating seat back and forth; and in the rotation process of the waist support piece, the rotation support arm can rotate in a self-adaptive manner, so that the sliding adjusting piece can correspondingly slide up and down along the sliding fit part. A gear circulating assembly is arranged between the sliding adjusting piece and the sliding matching part, and the gear circulating assembly enables the sliding adjusting piece to have a plurality of gear positions in the lifting process, so that the lumbar support piece correspondingly has a plurality of front and back adjusting gears; the sliding adjusting piece can move downwards again to reset after rising, namely the sliding adjusting piece can circularly and repeatedly rise along the sliding matching part and move downwards again to reset without acting any switch; therefore, when the lumbar support is adjusted, no adjusting switch is needed, and a user directly applies acting force for rotating the lumbar support to the lumbar support so that the lumbar support can rotate forwards and be ejected out and reset backwards again.

2, the rotating tooth piece is matched with the inverted tooth groove, so that in the lifting process of the sliding adjusting piece, the rotating tooth piece can deflect back and forth under the action of the elastic piece, and inverted teeth are sequentially matched with the inverted tooth groove tooth pieces at different positions; so that the sliding adjusting piece can stay at different positions, and the lumbar support piece can stay at different rotation angles. When the sliding adjusting piece needs to be reset, the sliding adjusting piece only needs to be acted again to move upwards, the inner convex teeth further extrude the rotating tooth piece, the positioning notches at the upper end of the rotating tooth piece are clamped with the positioning teeth of the telescopic protruding blocks, the rotating tooth piece is locked in a reset state, and the inverted teeth and the inner convex teeth are staggered left and right; then the sliding adjusting piece can be acted to move downwards for resetting.

3, a longitudinal avoidance groove for avoiding the reset top teeth is also concavely arranged at the rear end of the sliding adjusting piece, and the upper end of the avoidance groove penetrates through the sliding adjusting piece from front to back; when the rotating tooth parts are in a reset state, the joint of the bottoms of the two rotating tooth parts can be exposed out of the upper end of the avoidance groove. After the sliding adjusting piece is reset downwards, the reset top tooth can extrude upwards to act on the two rotating tooth pieces to generate deviating motion, so that each rotating tooth piece deflects towards the outer side to enable the positioning tooth to be separated from the positioning notch; then the elastic piece extrudes and acts on the rotating tooth piece to enable the inverted tooth to reset to the bottom end of the tooth part.

4, only a rectangular mounting groove is concavely arranged at the sliding matching part, and the sliding adjusting piece and the fixed seat are matched and then are mounted in the mounting groove together; so that the mounting groove is only needed to be arranged on the back support piece; the fixed seat is matched with the sliding adjusting piece and then embedded in the mounting groove; the processing and the assembly are convenient.

Drawings

Figure 1 is a side view of a lumbar support coupled to a back support in an embodiment of the present invention;

figure 2 is a side view of the lumbar support member being ejected forward in an embodiment of the present invention;

FIG. 3 is a schematic perspective view of the lumbar support and the back support coupled together according to the embodiment of the present invention;

FIG. 4 is a schematic perspective view of the interior of the sliding engagement portion of the present invention;

FIG. 5 is a perspective view of the sliding adjustment member and the back support member of the present invention;

FIG. 6 is a schematic perspective view of the sliding adjustment member engaged with the fixing base according to an embodiment of the present invention;

FIG. 7 is a perspective view of the rotatable tooth element engaged with the sliding adjustment element in an embodiment of the present invention;

FIG. 8 is a schematic perspective view of the engagement of the inverted tooth and the inverted tooth groove during upward movement of the sliding adjustment member according to the embodiment of the present invention;

FIG. 9 is a schematic perspective view of the tooth engagement of the inverted tooth and the inverted tooth groove in the embodiment of the present invention;

FIG. 10 is a schematic perspective view of the engagement of the inverted teeth and the inwardly projecting teeth of the present invention in an embodiment;

FIG. 11 is a schematic perspective view of the sliding adjustment member of the present invention in a lowered position;

FIG. 12 is a perspective view of the rear end of the slide adjuster of the present invention;

fig. 13 is a perspective view of the rotating gear in the reset state according to the embodiment of the present invention.

The figures are numbered: a back support 1; a lumbar support 2; a first connecting arm 3; a second connecting arm 4; an upper rotating base 5; a slide-fit portion 6; a slide adjuster 7; a guide groove 701; a guide bar 702; a lower rotary base 8; rotating the support arm 9; a mounting groove 10; a fixed seat 11; a toothing 1101; the rotating gear 12; a housing groove 13; the rotating gear 14; the arc convex portion 14a; an elastic member 15; a pawl 16; a hypotenuse 1601; a tooth chamfering slot 17; a movable caulking groove 18; a rotating shaft 19; a shaft hole 20; a limiting bulge 21; a limit groove 22; the inner convex teeth 23; a telescoping lug 24; a positioning tooth 25; a positioning notch 26; a connecting spring 27; a notch 28; the reset top tooth 29; an avoidance slot 30; a cover plate 31; a vertical slot 32.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

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

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

The 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 mode of the invention is as follows:

as shown in fig. 1 to 13, the lumbar support adjusting device of the chair provided by the present invention comprises a back support 1 and a lumbar support 2; the back end of the waist support 2 is provided with a first connecting arm 3 and a second connecting arm 4 which extend backwards; the first connecting arm 3 tends to horizontally extend rearward, and an upper rotating base 5 is provided on the back support 1, with which the first connecting arm 3 is hinged to the upper rotating base 5. A sliding fit part 6 is arranged below the upper rotating seat 5 of the back support 1, a sliding adjusting piece 7 is arranged in the sliding fit part 6 in a sliding mode, and the sliding adjusting piece 7 can slide up and down along the back support 1; the sliding adjusting piece 7 is provided with a lower rotating base 8, the second connecting arm 4 extends towards the rear lower part, a rotating supporting arm 9 is connected between the second connecting arm 4 and the lower rotating base 8, the front end of the rotating supporting arm 9 is hinged with the second connecting arm 4, and the rear end of the rotating supporting arm 9 is hinged with the lower rotating base 8. Then, the front-back depth of the lumbar support 2 can be adjusted by acting the lumbar support 2 to rotate around the upper rotating seat 5 back and forth; and in the rotation process of the lumbar support 2, the rotation support arm 9 can rotate in a self-adaptive manner, so that the sliding adjusting piece 7 can correspondingly slide up and down along the sliding matching part 6. And a gear position circulating assembly is arranged between the sliding adjusting piece 7 and the sliding matching part 6, and the gear position circulating assembly is configured to enable the sliding adjusting piece 7 to have a plurality of gear position positions in the lifting process, so that the lumbar support piece 2 correspondingly has a plurality of front and back adjusting gear positions. The sliding adjusting piece 7 can move downwards again to reset after rising, namely the sliding adjusting piece 7 can circularly and repeatedly rise along the sliding matching part 6 and move downwards again to reset without acting any switch; therefore, when the lumbar support 2 is adjusted, no adjusting switch is needed, and the user can directly apply the acting force for rotating the lumbar support 2 to enable the lumbar support 2 to rotate forwards and eject out and reset backwards again.

Specifically, the method comprises the following steps: as shown in fig. 1-3, the lumbar support 2 is of a forward-protruding arc structure, and the first connecting arm 3 and the second connecting arm 4 are both arranged at the middle position of the rear upper end of the lumbar support 2, so that the lumbar support 2 can rotate around the upper rotating seat 5 to realize the front-back depth adjustment. The second connecting arm 4 obliquely extends out from the rear lower part, and the lower rotating seat 8 forwardly protrudes out of the back support piece 1, so that the rotating supporting arm 9 is convenient to connect and match with the sliding adjusting piece 7; and as shown in fig. 1, when the sliding adjusting piece 7 is located at the lowest position, the rotating supporting arm 9 and the second connecting arm 4 tend to be in a straight line; when the waist support 2 rotates forwards, the force transmission effect between the second connecting arm 4 and the rotary supporting arm 9 is good, and the sliding adjusting part 7 can be driven to move upwards more easily.

As shown in fig. 3-7, a rectangular mounting groove 10 is concavely provided at the sliding fitting portion 6, and a fixing seat 11 is embedded and fixed in the mounting groove 10; the middle part of the fixed seat 11 is provided with a containing groove 13 for containing the sliding adjusting piece 7; a longitudinal guide groove 701 is concavely arranged at the back end of the sliding adjusting piece 7, and a guide strip 702 protruding forwards is correspondingly arranged in the accommodating groove 13; the sliding adjusting piece 7 is embedded in the containing groove 13, and the guide strip 702 is in sliding fit with the guide groove 701; so that the sliding adjuster 7 can slide up and down relative to the back support 1.

As shown in fig. 4 to 12, the shift position circulating assembly includes a rotary gear 14 provided on the sliding adjuster 7 in mirror image from left to right, an elastic member 15 acting on the rotary gear 14, and longitudinal engaging portions 1101 provided on both sides of the fixed base 11 in mirror image; the lower rotary base 8 is located below the rotary tooth 14. Wherein, each rotating tooth 14 is provided with a pawl 16 extending outwards, the toothed part 1101 comprises a plurality of longitudinally spaced pawl grooves 17, and the pawl grooves 17 can be in toothed fit with the pawl 16; specifically, the method comprises the following steps: the sliding adjusting piece 7 is of a rectangular structure, and two movable caulking grooves 18 for connecting the rotating gear 14 are arranged at the middle position of the sliding adjusting piece 7 in a mirror image manner; a rotating shaft 19 is arranged in each movable caulking groove 18, and a shaft hole 20 is formed in the rotating gear 14; the rotating gear 14 is inserted into the movable insertion groove 18 to rotatably insert the rotating shaft 19 into the shaft hole 20, so that the rotating gear 14 can only deflect inward and outward in the sliding adjuster 7. And the inverted tooth 16 is in a triangular structure protruding outwards, the rotating tooth 14 can rotate to enable the inverted tooth 16 to protrude outwards from the sliding adjusting piece 7, or the rotating tooth 14 can rotate inwards to shrink so that the end part of the inverted tooth 16 does not protrude out of the side end of the sliding adjusting piece 7. And a limiting mechanism is arranged between the rotating gear 12 and the sliding adjusting part 7, and comprises a limiting protrusion 21 arranged at the rear end of the rotating gear 12 and an arc-shaped limiting groove 22 correspondingly arranged on the sliding adjusting part 7, so that the rotating gear 12 can only rotate within a certain range. Further, the elastic member 15 is a spring transversely arranged between the two rotating tooth members 14, and two ends of the elastic member 15 are respectively arranged in the rotating tooth members 14 in a penetrating manner; the resilient member 15 is configured such that each rotating tooth member 14 always has a tendency to rotate outwardly to bring the inverted tooth 16 into toothed engagement with the inverted tooth slot 17.

The inverted tooth grooves 17 are longitudinally arranged at intervals, and the shapes of the inverted tooth grooves 17 are matched with the shapes of the tips of the inverted teeth 16; the inverted tooth 16 has a beveled edge 1601 for press fit with the inverted tooth groove 17; then when the waist support 2 rotates forwards, the sliding adjusting piece 7 moves upwards to drive the rotating tooth piece 14 to move upwards; as shown in fig. 8, the sloping sides 1601 of the said inverted teeth 16 will press fit with the slot walls of the inverted tooth slots 17 to deflect the rotary tooth member 14 inwardly so that the inverted teeth 16 can be moved upwardly out of the inverted tooth slots 17 in the current position; and the elastic member 15 is correspondingly deformed by extrusion; as shown in fig. 9, after the sliding adjusting member 7 is lifted by a certain distance, the rotating tooth member 14 will deflect outward again under the elastic force of the elastic member 15, so that the inverted tooth 16 is engaged in the inverted tooth groove 17 above, and the inverted tooth 16 and the inverted tooth groove 17 can limit the sliding adjusting member 7 from moving downward, thereby playing a role of stopping movement; thereby enabling the sliding adjuster 7 to be locked in this position. Then, in the forward rotation process of the lumbar support 2, the sliding adjusting piece 7 correspondingly moves upwards and enables the inverted teeth 16 to be in tooth joint with inverted tooth grooves 17 with different heights in sequence; the sliding adjuster 7 can then stay in a plurality of positions, so that the lumbar support 2 has a plurality of forward and backward adjustment gears. And the actions of the rotating tooth part 14 and the inverted tooth groove 17 in the process are performed spontaneously along with the rising of the sliding adjusting part 7 without any switch for control.

As shown in fig. 5-12, when the inverted tooth 16 is engaged at the uppermost inverted tooth slot 17, the lumbar support 2 is in the maximum front top shift position; if the lumbar support adjusting part 2 needs to rotate backwards for resetting, even if the sliding adjusting part 7 descends again for resetting, the lumbar support adjusting part 2 only needs to be acted continuously to rotate forwards, and the sliding adjusting part 7 is enabled to ascend continuously; the method specifically comprises the following steps: an inner convex tooth 23 protruding inwards is further arranged at the upper end of the tooth joint part 1101 on each side, and the tip end of the inner convex tooth 23 approaches the side end of the sliding adjusting piece 7; when the sliding adjusting piece 7 needs to be moved downwards for resetting, the sliding adjusting piece 7 is continuously moved upwards; the inner lobe 23 will be in a press fit with the beveled edge 1601 of the pawl 16 and the inner lobe 23 will act to deflect the rotating tooth member 14 further inwardly. Correspondingly, a telescopic lug 24 and a connecting spring 27 enabling the telescopic lug 24 to elastically stretch and retract longitudinally are arranged at the upper end of each rotating tooth 14 of the sliding adjusting piece 7; a positioning tooth 25 protruding downwards is arranged at the bottom end of the telescopic lug 24; an arc convex part 14a which protrudes upwards is arranged at the upper end of each rotating tooth part 14 close to the central position of the sliding adjusting part 7, and a positioning notch 26 which can be in toothed fit with the positioning tooth 25 is arranged on the arc convex part 14 a. During the process that the sliding adjusting piece 7 moves upwards continuously, as shown in fig. 10, the inner convex teeth 23 act on the rotating tooth piece 14 to deflect towards the inner side, so that the positioning teeth 25 are in press fit with the arc convex parts 14a, and the telescopic lugs 24 rise elastically and have the tendency of moving downwards again; when the rotating tooth part 14 is deflected inward until the end of the pawl 16 is located inside the side end of the sliding adjuster 7, as shown in fig. 11, the positioning teeth 25 will be engaged with the positioning notches 26, so that the rotating tooth part 14 can be locked; at the moment, the rotating tooth piece 14 is in a reset state, and the inverted teeth 16 and the inner convex teeth 23 are staggered left and right; so that the slide adjusting piece 7 can be reset by being moved downward. The positioning teeth 25 and the positioning notches 26 are matched to lock the rotation locking member 14 in a reset state, and the telescopic lugs 24 can longitudinally stretch, so that the rotation locking member 14 can deflect under the action of external force to separate the positioning teeth 25 from the positioning notches 26.

As shown in fig. 6, 7, 11-13, in the reset state, the lower ends of the left and right rotating teeth 14 abut against each other, and a notch 28 in a shape of a concave upward is formed between the lower ends of the two rotating teeth 14; a reset top tooth 29 is arranged in the middle of the lower portion of the fixed seat 11, a longitudinal avoidance groove 30 for avoiding the reset top tooth 29 is arranged at the back end of the sliding adjusting piece 7, and the upper end of the avoidance groove 30 penetrates through the sliding adjusting piece 7 from front to back, so that in a reset state, the joint of the bottoms of the two rotating tooth pieces 14 can just expose out of the upper end of the avoidance groove 30; then, after the sliding adjusting member 7 moves downwards to be reset to the bottom end of the fixed seat 11, the reset top tooth 29 can be just propped up in the notches 28 at the lower ends of the two rotating tooth members 14, and the reset top tooth 29 can be upwards extruded to act on the two rotating tooth members 14, so that each rotating tooth member 14 deflects outwards, and the positioning tooth 25 is separated from the positioning notch 26; subsequently, the rotating tooth 14 is deflected outward by the elastic member 15, so that the inverted tooth 16 is restored to the bottom end of the tooth 1101 again.

As shown in fig. 3, a cover plate 31 is further connected to the front end of the fixing base 11, and the cover plate 31 can limit the sliding adjuster 7 from being detached from the fixing base 11, and can hide the connecting trace, so that the structure is beautiful. The lower rotating base 8 protrudes forwards from the front end of the cover plate 31, so that the connection is convenient; the cover plate 31 is correspondingly provided with a vertical slot 32 which moves up and down to avoid the lower rotating base 8.

Then, as can be seen from the above, the slide adjuster 7 can move up and down to return to the original position in the slide fitting portion 7 in a reciprocating manner; so that the lumbar support 2 can rotate forwards around the upper rotating seat 5 in a reciprocating manner and reset backwards again; in the adjusting operation process, a user only needs to directly grasp the waist support 2 and apply acting force to the waist support without any other switch; the adjustment is simpler and more convenient, and the feeling of high grade is better.

The present invention and its embodiments have been described above schematically, without limitation, 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, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims (15)

1. A lumbar support adjustment device for a chair, comprising:

a lumbar support member disposed on the back support member; the rear end of the waist support piece is provided with a first connecting arm and a second connecting arm which extend backwards; the back support is provided with an upper rotating seat, and the first connecting arm is hinged with the upper rotating seat;

a rotary support arm disposed between the second link arm and the back support; the front end of the rotary supporting arm is hinged with the second connecting arm; the back support piece is positioned below the upper rotating seat and is provided with a sliding fit part, and the rear end of the rotating support arm is connected to the sliding fit part;

a slide adjuster disposed in the slide fitting portion; the sliding adjusting piece can slide up and down along the back supporting piece; the sliding adjusting piece is provided with a lower rotating base, and the rear end of the rotating supporting arm is hinged on the lower rotating base; the sliding adjusting piece can correspondingly slide up and down along the sliding matching part in response to the back-and-forth rotating action of the waist support piece around the upper rotating seat through the rotating supporting arm;

the gear circulating assembly is arranged between the sliding adjusting piece and the sliding matching part; the gear circulating mechanism comprises a rotating gear piece, an elastic piece and longitudinal tooth connection parts, wherein the left mirror image and the right mirror image of the rotating gear piece are arranged on the sliding adjusting piece; each rotating tooth part is provided with inverted teeth extending towards the outer side, and the tooth connection part comprises at least two inverted tooth grooves which are longitudinally spaced; in the process that the sliding adjusting piece moves upwards, the rotating tooth piece deflects towards the inner side and moves upwards to be separated from the inverted tooth groove, and the rotating tooth piece deflects towards the outer side again under the action of the elastic piece and is in tooth joint with the inverted tooth groove at the corresponding position;

the rotating gear piece is also provided with a reset state which enables the sliding adjusting piece to move downwards for resetting; a telescopic lug which can elastically stretch and retract longitudinally is arranged at the upper end of each rotating tooth part of the sliding adjusting part, one of the telescopic lug and the rotating tooth part is provided with a positioning tooth, and the other of the telescopic lug and the rotating tooth part is provided with a positioning notch; the upper end of the tooth connecting part on each side is provided with an inner convex tooth protruding towards the rotating tooth part; in a reset state, the sliding adjusting piece moves upwards to the inner convex teeth to act on the rotating tooth pieces to deflect towards the inner side so that the positioning teeth are clamped with the positioning notches, and the lower ends of the two rotating tooth pieces are attached together; and the inverted tooth of each rotating tooth piece is staggered with the inner convex tooth on the corresponding side left and right; a reset top tooth is also arranged at the middle position of the lower part of the sliding fit part; when the sliding adjusting piece moves downwards for resetting, the resetting top tooth can extrude upwards to act on the two rotating tooth pieces to generate deviating motion, and each rotating tooth piece deflects towards the outer side to enable the positioning tooth to be separated from the positioning notch; the elastic piece extrudes and acts on the rotating tooth piece to enable the inverted tooth to reset to the bottom end of the tooth connection part.

2. The lumbar support adjustment device for a chair according to claim 1, wherein: the sliding adjusting piece is of a rectangular structure, and two movable caulking grooves for connecting the rotating gear pieces are arranged in the middle of the sliding adjusting piece in a mirror image mode; a rotating shaft is arranged in each movable caulking groove, and a shaft hole is formed in each rotating gear; the rotating gear is embedded in the movable embedded groove and enables the rotating shaft to rotatably penetrate through the shaft hole.

3. The lumbar support adjustment device for a chair according to claim 1, wherein: the elastic part is a spring transversely arranged between the two rotating tooth parts; two ends of the spring are respectively arranged in the rotating tooth part in a penetrating way; the resilient member is configured such that each rotating tooth always has a tendency to rotate outwardly to cause the tooth to engage the tooth in the tooth-engaging engagement with the tooth-chamfering groove.

4. A lumbar support adjustment device for a chair according to claim 1, wherein: in a reset state, an upper concave notch is formed between the lower ends of the two rotating tooth pieces; the reset top tooth can be propped upwards in the notch.

5. A lumbar support adjustment device for a chair according to claim 4, wherein: the rear end of the sliding adjusting piece is concavely provided with a longitudinal avoidance groove for avoiding the reset top tooth, and the upper end of the avoidance groove penetrates through the sliding adjusting piece from front to back; under the reset state, the bottom junction of the two rotating tooth parts can be exposed out of the upper end of the avoidance groove.

6. The lumbar support adjustment device for a chair according to claim 1, wherein: the end part of the inner convex tooth approaches to the side end of the sliding adjusting piece; in the lifting process of the sliding adjusting piece, the inverted teeth outwards protrude out of the side end of the sliding adjusting piece; in the reset state, the rotating tooth piece rotates inwards to contract so that the end part of the inverted tooth does not protrude out of the side end of the sliding adjusting piece.

7. A lumbar support adjustment device for a chair according to claim 1, wherein: the inverted teeth are of triangular structures protruding outwards, and the shapes of the inverted tooth grooves are matched with the shapes of the tips of the inverted teeth; and the inverted tooth is provided with a bevel edge which is in extrusion fit with the groove wall of the inverted tooth groove and the inner convex tooth.

8. The lumbar support adjustment device for a chair according to claim 1, wherein: a rectangular mounting groove is concavely arranged at the sliding matching part, and a fixed seat is embedded and fixedly arranged in the mounting groove; the middle part of the fixed seat is provided with a containing groove for containing the sliding adjusting piece; the sliding adjusting piece is in sliding fit in the accommodating groove; the tooth parts are arranged on two sides of the fixed seat in a mirror image manner; the reset top teeth are arranged at the middle position of the lower part of the fixed seat.

9. The lumbar support adjustment device for chairs of claim 8, wherein: a longitudinal guide groove is concavely arranged at the back end of the sliding adjusting piece, and a guide strip protruding forwards is correspondingly arranged in the accommodating groove; the sliding adjusting piece is embedded in the containing groove and enables the guide strip to be in sliding fit with the guide groove.

10. A lumbar support adjustment device for a chair according to claim 1 or 8, wherein: the sliding fit portion is still including setting up the apron at the front end, the lower rotating base sets up the lower extreme at the slip adjustment spare, and the lower rotating base is outstanding forward in the apron, correspondingly is equipped with the perpendicular groove of dodging lower rotating base on the apron.

11. The lumbar support adjustment device for a chair according to claim 1, wherein: an arc convex part protruding upwards is arranged at the upper end of each rotating tooth part and close to the center of the sliding adjusting part, and the positioning notch is arranged on the arc convex part; the positioning teeth are correspondingly arranged at the bottom ends of the telescopic lugs; the sliding adjusting piece is provided with a longitudinal connecting spring for acting the elastic expansion of the expansion convex block.

12. The lumbar support adjustment device for a chair according to claim 2, wherein: a limiting mechanism is arranged between the rotating gear and the sliding adjusting part and comprises a limiting protrusion arranged on one of the rotating gear or the sliding adjusting part and an arc-shaped limiting groove correspondingly arranged on the other of the rotating gear or the sliding adjusting part.

13. A lumbar support adjustment device for a chair according to claim 1, wherein: when the sliding adjusting piece is positioned at the lowest position, the rotating supporting arm and the second connecting arm tend to form a straight line.

14. The lumbar support adjustment device for a chair according to claim 1, wherein: the waist leans on support piece to be convex arc structure forward, and first linking arm and second linking arm all set up the intermediate position department of leaning on support piece rear upper end at the waist.

15. A chair comprising a lumbar support adjustment device of a chair as claimed in any of claims 1-14.

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