CN221865239U - Chair - Google Patents

Abstract

The utility model provides a chair, includes the back sleeve that one end and support are fixed, the back sleeve other end cup joints preceding sleeve, preceding sleeve is kept away from the one end of back sleeve is passed through the connecting seat and is connected with the waist is leaned on, install in the preceding sleeve can promote preceding sleeve is relative the electric telescopic push rod of back sleeve back-and-forth movement, in the back sleeve of back end is fixed in to electric telescopic push rod's one end, in the front sleeve of the other end is fixed in the waist and leans on the end. Because the other end of the rear sleeve is sleeved with the front sleeve, the electric telescopic push rod pushes the front sleeve, and the end part of the front sleeve and the lumbar support are taken as a whole, the lumbar support moves along with the front sleeve, so that the lumbar support moves more stably; in addition, the rear sleeve protects the front sleeve on the outer side to prevent the front sleeve from shaking, and the front sleeve is more stable in moving.

Description

A chair

Technical Field

The utility model relates to a chair, in particular to a chair with an adjustable waist support.

Background Art

The lumbar support of an office chair is mainly to fit the human waist, provide good support to the human body, and effectively relieve the waist fatigue and tiredness caused by sitting for a long time. In order to meet the needs of users, some lumbar supports on current chairs are directly connected to the lumbar support through a worm gear to adjust the lumbar support forward and backward. However, the lumbar support lacks stability when the worm gear is directly connected to the lumbar support to move forward and backward.

Utility Model Content

The utility model aims to provide a chair with a lumbar support that can move more stably.

The chair described in the utility model includes a chair back, a chair seat, chair legs and a lumbar support, and further has a rear sleeve with one end fixed to the chair back bracket, the other end of the rear sleeve is sleeved on the front sleeve, the end of the front sleeve away from the rear sleeve is connected to the lumbar support through a connecting seat, an electric telescopic push rod is installed in the front sleeve and can push the front sleeve to move forward and backward relative to the rear sleeve, one end of the electric telescopic push rod is fixed in the rear sleeve, and the other end is fixed in the front sleeve.

Furthermore, one end of the electric telescopic push rod in the front sleeve is set as the telescopic end, a protective sleeve for the telescopic end to extend into is arranged in the front sleeve, and a protective ridge abutting against the telescopic end is arranged on the inner wall of the protective sleeve.

Furthermore, the front sleeve and the rear sleeve are connected to each other through a release sleeve, and the release sleeve is made of wear-resistant plastic material. A supporting ridge for supporting the release sleeve is provided between the inner wall of the rear sleeve and the outer wall of the release sleeve.

Furthermore, the release sleeve includes an upper cover plate and a lower cover plate, which relatively cover the outside of the front sleeve. The upper cover plate and the lower cover plate are inserted into the pits on the upper and lower sides of the front sleeve through positioning columns, and gaps are left on both sides to form a slide groove. Two guide convex rails are provided on the inner wall of the rear sleeve to cooperate and insert into the two slide grooves.

Furthermore, a slot for installing a lumbar support is provided on the front sleeve, sliding links are provided on both sides of the end of the front sleeve in the slot, longitudinal long holes are provided on both sides of the lumbar support matching with the sliding links, a lifting positioning slot is provided between the two longitudinal long holes on the front side of the lumbar support, the end of the sliding link extends from the longitudinal long hole into the lumbar support and is fixedly installed on the fixed plate, a slider is installed on the inner side of the fixed plate, and the slider is placed in the lifting positioning slot; a longitudinal rack is provided on one side of the lifting positioning slot, and a V-shaped limit card matching with the longitudinal rack is installed on the slider through a rotating shaft; the V-shaped limit card includes two support arms, one of which is against the limiting piece on the slider, and teeth matching with the longitudinal rack are provided on the outer side of the other support arm, and the angle between the two support arms has a certain compression deformation, and its rebound force is used to provide a clamping force for mutual support and positioning between the longitudinal rack and the teeth.

Furthermore, the chair is provided with a headrest, the back of the bottom of the headrest is against the chair back; there is also a mounting seat, the bottom of the mounting seat is fixedly mounted on the back side of the chair back, the top of the mounting seat is higher than the chair back, and a connecting portion extends forward from the top of the mounting seat, and a pillow seat is hinged at one end of the connecting portion away from the mounting seat, the headrest is located on the front side of the chair back and is mounted on the end of the pillow seat away from the connecting portion, the bottom of the headrest is lower than the top of the chair back, so that the headrest overlaps with the upper and lower parts of the chair back.

Furthermore, the connecting part is hinged to the pillow seat; two rotating shafts opposite to each other are arranged on the pillow seat, the connecting part is provided with connecting ears sleeved on the rotating shafts, and the pillow seat is provided with multi-position fan-shaped convex teeth, and the connecting part is provided with an elastic limiter matching with the fan-shaped convex teeth.

Furthermore, the headrest is connected to the pillow seat in a liftable manner; a vertically arranged guide groove is provided in the headrest, positioning racks are provided on both sides of the guide groove, the adjustment block is cooperatively placed in the guide groove, an elastic protrusion is provided on the adjustment block, the elastic protrusion and the positioning rack are mutually engaged, a longitudinal long hole of the headrest that passes through the back of the headrest is provided on the back of the guide groove, the pillow seat is provided with a pillow seat connecting rod, and the pillow seat connecting rod extends from the longitudinal long hole of the headrest into the guide groove and is fixedly connected to the adjustment block.

Furthermore, a concave mounting groove is provided on the surface of the headrest, the vibration massager is installed in the mounting groove, a supporting member is provided on the outer side of the vibration massager, the periphery of the supporting member cooperates with the notch edge of the mounting groove and together with the remaining surface of the headrest except the mounting groove to form a supporting surface of the headrest, the supporting member has a soft part, and the massage head of the vibration massager corresponds to the soft part.

Furthermore, the top of the chair back is a shoulder pillow, and two shoulder pillows are respectively installed on both sides of the front of the top of the chair back; the shoulder pillow is arc-shaped and both sides are bent forward.

The chair described in the utility model has a rear sleeve with the other end thereof sleeved on the front sleeve, an electric telescopic push rod pushes the front sleeve, the end of the front sleeve and the lumbar support are integrated as a whole, the lumbar support moves along with the front sleeve, and the movement of the lumbar support is more stable; in addition, since the rear sleeve protects the front sleeve on the outside to prevent the front sleeve from shaking, the front sleeve moves more stably.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic structural diagram of a chair.

FIG. 2 is a schematic diagram of the exploded structure of a chair.

FIG. 3 is a schematic diagram of a partial exploded structure of a chair.

Figure 4-7 is a schematic diagram of the structure of the chair adjustment part.

FIG. 8 is a schematic diagram of the partial structure of the adjustment part of the chair.

FIG. 9 is a schematic structural diagram of a slider.

Figures 10 and 11 are schematic diagrams of the structure of the headrest and shoulder pillow parts of the chair.

FIG. 12 is a schematic diagram of the connection structure between the headrest and the adjustment block.

FIG. 13 is a schematic diagram of the connection structure between the mounting base and the pillow base.

FIG. 14 is a schematic diagram of the connection structure of the headrest, the pillow base and the mounting base.

FIG. 15 is a schematic structural diagram of a mounting base.

FIG. 16 is a schematic diagram of the exploded structure of the headrest.

DETAILED DESCRIPTION

The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

If there are descriptions involving "first" or "second" in the embodiments of the utility model, the descriptions of "first" or "second" are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

The utility model provides a chair.

The chair of this embodiment includes a chair back 11, a chair seat, chair legs and a lumbar support 12; there is also a rear sleeve 5 with one end fixed to the chair back 11 bracket, the other end of the rear sleeve 5 is connected to the front sleeve 6, the end of the front sleeve 6 away from the rear sleeve 5 is connected to the lumbar support 12 through a connecting seat, and an electric telescopic push rod 3 is installed in the front sleeve 6 to push the front sleeve 6 to move forward and backward relative to the rear sleeve 5, one end of the electric telescopic push rod 3 is fixed in the rear sleeve 5, and the other end is fixed in the front sleeve 6.

As shown in Figure 1-6, since the other end of the rear sleeve is connected to the front sleeve, the electric telescopic push rod pushes the front sleeve, and the end of the front sleeve and the lumbar support are as a whole. The lumbar support moves with the front sleeve, making the movement of the lumbar support more stable; in addition, since the rear sleeve protects the front sleeve on the outside to prevent the front sleeve from shaking, the front sleeve moves more stably.

In the chair, one end of the electric telescopic push rod 3 in the front sleeve 6 is set as the telescopic end, and a protective cover 61 is provided in the front sleeve 6 for the telescopic end to extend into, and the inner wall of the protective cover 61 is provided with a protective ridge 62 that abuts against the telescopic end. Since the protective cover and the protective ridges on the inner wall of the protective cover protect the telescopic end of the electric telescopic push rod, the telescopic end is prevented from shaking when moving, and the front sleeve is further made more stable when moving. In addition, the front sleeve 6 and the rear sleeve 5 are mutually connected through the release cover 4, and the release cover is made of wear-resistant plastic material, which can reduce the wear between the front sleeve and the rear sleeve and increase the service life; at the same time, since the release cover has a loosening effect, a gap for movement can be reserved between the front sleeve and the rear sleeve in a tightened state, thereby reducing the friction between the front sleeve and the rear sleeve, so that they can move better; in a relaxed state, the front sleeve and the rear sleeve can be pressed against each other to reduce shaking and increase the stability of the entire structure. In addition, a supporting ridge 51 for supporting the release sleeve 4 is provided between the inner wall of the rear sleeve 5 and the outer wall of the release sleeve 4, and the release sleeve is supported by the supporting ridge, so that the release sleeve is more stable when moving. The release sleeve 4 includes an upper cover plate 41 and a lower cover plate 42, and the upper cover plate 41 and the lower cover plate 42 are relatively covered outside the front sleeve 6, and the upper cover plate 41 and the lower cover plate 42 are inserted into the pits 43 on the upper and lower sides of the front sleeve 6 through positioning columns to cover the outside of the front sleeve, and then a gap is left on both sides to form a slide groove 44, and two guide convex rails 52 are provided on the inner wall of the rear sleeve 5 to cooperate and insert into the two slide grooves. After the upper cover plate and the lower cover plate of the loosening sleeve are inserted into the pit through the positioning column, due to the gaps on both sides thereof, the effects of loosening and tightening can be achieved in the front sleeve; at the same time, due to the gaps on both sides of the upper cover plate and the lower cover plate of the loosening sleeve to form a slide groove, after the loosening sleeve and the front sleeve are as a whole, they move on the two guide convex rails on the inner wall of the rear sleeve through the slide groove, so that the loosening sleeve and the front sleeve as a whole can move more smoothly in the rear sleeve.

The chair is provided with guard plates 63 on both sides of the connection seat of the front sleeve 6, the guard plates 63 extend toward the rear sleeve 5, and a guard plate groove 64 is formed between the two guard plates 63 and the front sleeve 6 for the rear sleeve 5 to be inserted. By providing guard plates on both sides of the connection seat of the front sleeve, the two guard plates form two wing arms on the two wings of the entire adjustment structure, so that the waist support is more stable and does not shake when moving; and because the connection seat and the guard plates are integrated and hollow, the integrated hollow guard plate and connection seat structure is more evenly stressed, which can further keep the balance of the entire adjustment structure without shaking.

The chair has latch rods 31 at both ends of the electric telescopic push rod 3, and the latch rods 31 respectively fix the two ends of the electric telescopic push rod 3 in the rear sleeve 5 and the front sleeve 6. The ends of the electric telescopic push rod are respectively installed on the latches of the rear sleeve and the front sleeve through the latch rods, and the electric telescopic push rod can be fixed by inserting the latch rod into the latch hole, which makes the operation more convenient. The rear sleeve 5 is provided with a fixing seat 53, and the fixing seat 53 fixes the end of the rear sleeve 5 on the chair back 11.

The chair has a slot 65 for mounting the lumbar support 12 on the front sleeve 6, sliding links 66 are arranged on both sides of the end of the front sleeve 6 in the slot 65, longitudinal long holes 67 are arranged on both sides of the lumbar support 12 matching with the sliding links 66, and a lifting positioning slot 68 is arranged between the two longitudinal long holes 67 on the front side of the lumbar support 12, and the end of the sliding link 66 extends from the longitudinal long hole 67 into the lumbar support 12 and is fixedly mounted on a fixing plate 69, a slider 610 is installed on the inner side of the fixing plate 69, and the slider 610 is placed in the lifting positioning slot; a longitudinal rack 611 is arranged on one side of the lifting positioning slot 68, and a V-shaped limit card 612 matching with the longitudinal rack 611 is installed on the slider 610 through a rotating shaft; the V The shaped limit clamp 612 includes two support arms, one of which is against the limit piece on the slider 610, and the outer side of the other support arm is provided with teeth 613 that cooperate with the longitudinal rack 611. The angle between the two support arms has a certain compression deformation, and its resilience is used to provide a mutually supporting and positioning clamping force between the longitudinal rack 611 and the teeth 613. The sliding connecting rod fixed to the front sleeve end of the waist support is inserted from the longitudinal long hole into the lifting and positioning groove on the front side of the waist support, and is fixedly connected to the slider through the fixing plate. The lifting and positioning groove on the waist support moves up and down relative to the slider and the longitudinal long hole relative to the sliding connecting rod, so as to realize the up and down movement of the waist support. At the same time, the side wall of the lifting and positioning groove is provided with a longitudinal rack, and the teeth on the outer side of a support arm of the V-shaped limit card on the slider match the longitudinal rack. Since the angle between the two support arms of the V-shaped limit card has a certain compression deformation, the resilience of the deformation can provide sufficient support and positioning force between the rack and the teeth during the up and down movement of the waist support, so that the waist support can maintain different height positions and achieve up and down adjustment of the waist support, so as to adapt to the use needs of different human bodies. In addition, the support arm at the end of the teeth 613 of the V-shaped limit card 16 is inclined upwardly provided with an extension rod 614, and a rotatable reset block 615 is arranged above the extension rod 614. The reset block 615 is installed on the slider 610 through a rotating shaft, and the reset block 615 has a pressure rod 616 that can press the two support arms of the V-shaped limit card 16 when rotating and separate the teeth 613 from the longitudinal rack 611. By rotating the reset block, the teeth are separated from the rack, and the massager can be quickly moved up and down to achieve rapid reset. In addition, the reset block 615 is provided with a push rod 617 at the other end opposite to the pressure rod 616. A lever 618 is provided in the lifting positioning groove 68, which can be used to toggle the push rod 617 to rotate the reset block 615 when the slider 610 moves to the end. The reset block is rotated by the lever, so that the pressure rod rotates to press the two support arms of the V-shaped clamp to separate the teeth from the rack, so that the waist support is reset. The lever can be two upper and lower levers, which are respectively pushed when the waist support moves upward to the highest point or downward to the lowest point. When the waist support moves to the upper and lower ends, the lever can automatically rotate the reset block without any additional operation to separate the teeth from the rack, and the reset operation is faster and more convenient. The push rod 617 is also provided with a toggle portion 619 extending downward, and a toggle window 620 is provided at the position opposite to the slider 610 and the push rod 617, and the toggle portion 619 of the push rod 617 is located in the toggle window 620. When the lumbar support moves to the end, the downwardly extending toggle portion 24 facilitates reliable toggle of the lever, and the downward extension of the toggle portion prevents the lever from protruding outward, thereby preventing the lever from interfering with other structures and moving parts.

The chair is equipped with a headrest 7, the back of the bottom of the headrest 7 is against the chair back 11; there is also a mounting seat 8, the bottom of the mounting seat 8 is fixedly installed on the rear side of the chair back 11, the top of the mounting seat 8 is higher than the chair back 11, and a connecting portion 81 extends forward from the top of the mounting seat 8, and a pillow seat 9 is hinged at one end of the connecting portion 81 away from the mounting seat 8. The headrest 7 is located on the front side of the chair back and is installed at the end of the pillow seat 9 away from the connecting portion. The bottom of the headrest 7 is lower than the top of the chair back 11, so that the headrest 7 overlaps with the upper and lower parts of the chair back 11. The bottom of the headrest is located in front of the chair back and partially overlaps with the chair back in the upper and lower directions, which is more in line with ergonomic requirements, can adapt to the lordotic structure of the cervical spine while supporting the head, can also fit the human neck better, and provide good support for the neck, forming a more effective support, and improving comfort of use; at the same time, the chair back and headrest structure that partially overlap in the upper and lower directions also makes the force arm from the point where the headrest force is applied to the connection between the headrest and the chair relatively shorter, thereby reducing the torque, improving the force, and thus improving the stability and service life of the structure.

In the chair, the connection part 81 is hinged with the pillow seat 9 so as to adjust the headrest to meet the needs of different groups of people; specifically, two rotating shafts 93 opposite to each other can be set on the pillow seat 9, the connection part 81 is provided with a connecting ear 82 sleeved on the rotating shaft 93, and the pillow seat 9 is provided with a multi-position fan-shaped convex tooth 94, and the connection part 81 is provided with an elastic limiter 83 matched with the fan-shaped convex tooth 94. At the same time, the back of the bottom of the headrest 7 is against the chair back 11 so that the headrest and the chair back are in contact, and the chair back can provide better support for the headrest. The top of the chair back 11 is a shoulder pillow 10, and the headrest 7 and the shoulder pillow 10 are both arc-shaped and the two sides are bent forward to better fit the head and shoulders of the human body. In addition, the top and bottom surfaces of the mounting seat 8 and the pillow seat 9 are both arc-shaped to ensure sufficient adjustment range.

In the chair, the headrest 7 is connected to the pillow seat 9 in a liftable manner. Specifically, a vertically arranged guide groove can be provided in the headrest 7, and positioning racks 71 are provided on both sides of the guide groove. An adjusting block 92 is cooperated and placed in the guide groove. An elastic protrusion is provided on the adjusting block 92, and the elastic protrusion and the positioning rack 71 are mutually engaged. A longitudinal long hole 72 of the headrest that passes through the back of the headrest 7 is provided on the back of the guide groove. The pillow seat 9 is provided with a pillow seat connecting rod 91, and the pillow seat connecting rod 91 extends from the longitudinal long hole 72 of the headrest into the guide groove and is fixedly connected with the adjusting block 92. The headrest can be lifted and lowered by pulling the headrest or driving with a motor to move the positioning rack and the longitudinal long hole of the headrest relative to the pillow seat connecting rod and the adjusting block. The components of this adjusting structure are hidden inside the headrest, which can not only ensure the structural stability and reduce the force torque of the headrest, but also have better aesthetics, working stability and longer service life.

As shown in FIG. 12 , the surface of the headrest 7 of the chair is provided with a concave mounting groove 73, the vibration massager 30 is installed in the mounting groove 73, and a supporting member 74 is provided on the outer side of the vibration massager 30. The periphery of the supporting member 74 cooperates with the notch edge of the mounting groove 73 and together with the remaining surface of the headrest 7 except the mounting groove 73, constitutes the supporting surface of the headrest. The supporting member 74 has a soft portion 75, and the massage head of the vibration massager 30 corresponds to the soft portion 75. Since there is a soft part on the supporting member, the massage head of the vibration massage device is opposite to the soft part. When massaging the head, the soft part can fit the head to provide better flexible cushioning support for the head, and the massage comfort is better. In addition, since the vibration massage device is installed in the installation groove on the surface of the headrest, and the supporting member is arranged on the outside of the vibration massage device, at this time, the peripheral edge of the supporting member cooperates with the notch edge of the installation groove and the remaining surface of the headrest except the installation groove to form the supporting surface of the headrest. During the operation of the vibration massage device, the influence of the remaining surface of the headrest except the installation groove can be reduced, and the service life of the headrest is extended.

In the chair, the vibration massager 30 is a vibrator that can generate vibration when powered on, and the vibrator is a low-frequency vibrator. The supporting member 74 is a supporting plate made of soft rubber material, and the supporting plate made of soft rubber material can improve the comfort of the human body in contact with the cover plate. There are four soft parts 75, each of which corresponds to the massage head of the vibration massager 30. Since a vibrator is installed in each massage part, the massage area is increased, and the massage effect is further improved. In addition, the headrest 7 includes a headrest front frame 76, a headrest rear frame 77 and a pillow pad 78. The circuit board 79 is installed on the headrest rear frame 77 and covered by the headrest front frame 76. The key switch 70 is installed on one side of the headrest rear frame 77 for easy operation. The headrest front frame 76 is installed with a headrest pad, and the surface of the headrest pad is provided with a concave mounting groove 73 and the electric heating pad 40, the foam partition 50, the vibrator and the supporting plate are installed in sequence. A wire channel is provided in the mounting groove 73, and wires are arranged in the wire channel. The vibrator and the electric heating pad are electrically connected to the circuit board through the wires. The electric heating pad is a low-power physiotherapy electric heating pad. By adding the physiotherapy electric heating pad to generate heat, the user's blood circulation can be improved, and the massage effect can be further enhanced.

As shown in Fig. 6 and Fig. 7, the two shoulder pillows 10 are respectively installed on both sides of the front of the top of the chair back 11. The shoulder pillows are respectively installed on the left and right sides of the top of the chair back, corresponding to the left and right shoulders of the human body. When the user leans on the shoulder pillows, the shoulder pillows on both sides are deformed by different pressures, thereby providing appropriate support for the shoulders of the human body, which can effectively improve the comfort of use.

In the chair, the two shoulder pillows 10 can be provided separately, and a gap is left between the two shoulder pillows, so as to provide better support for the shoulders of the human body and meet the needs of different groups of people. The adjacent sides of the two shoulder pillows 10 can also be connected to each other as a whole, and a concave groove 101 is provided on the front of the connection part of the two shoulder pillows 10. The adjacent sides are provided as a whole to improve the aesthetics and the convenience of assembly and disassembly of the shoulder pillows. At the same time, they are separated by the grooves, and elastic cotton is installed in the two shoulder pillows respectively to ensure the support for the shoulders of the human body. In addition, the shoulder pillow 10 is an arc that bends from the midline of the chair back 11 to both sides and forward, so as to make it more in line with the sitting posture of the human body and the posture when the hands are forward, further improving the support effect and comfort of use; and the top of the chair back 11 is also an arc that is consistent with the shoulder pillow 10 to improve the aesthetics of the chair.

The chair has a clothes-hanging rod 20 for hanging clothes, and the clothes-hanging rod 20 is installed on the back of the mounting seat 8. This is because the indoor temperature is generally high and is not affected by bad weather. People often take off their coats after entering the room, and often hang them on the chair after taking them off. However, if they are hung in front of the chair, it will cause obstacles, and if they are hung behind the chair, they are easy to fall off. Therefore, a clothes-hanging rod is arranged behind the mounting seat, which can conveniently and stably hang clothes and avoid obstacles to users. A plurality of through holes are opened in the middle of the clothes-hanging rod 20 and the mounting seat 8, and screw holes are opened on the back of the chair 11 at the positions corresponding to the through holes. The fixing bolts pass through the through holes and are locked with the screw holes, so that the clothes-hanging rod is stably fixed on the mounting seat. In addition, a concave platform can be provided on the back of the clothes-hanging rod 20, and the through holes are arranged at the concave platform. There is also a decorative cover 201 covering the concave platform, so as to improve the aesthetics, and the decorative cover 201 can be detachably installed on the mounting seat 8 by buckles, so as to facilitate installation and removal.

The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly/indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims (10)

1. A chair, comprising a backrest (11), a seat, chair legs and a lumbar support (12), characterized in that: a rear sleeve (5) is further provided with one end fixed to a bracket of the backrest (11), the other end of the rear sleeve (5) is sleeved with a front sleeve (6), the end of the front sleeve (6) away from the rear sleeve (5) is connected to the lumbar support (12) through a connecting seat, an electric telescopic push rod (3) is installed in the front sleeve (6) and can push the front sleeve (6) to move forward and backward relative to the rear sleeve (5), one end of the electric telescopic push rod (3) is fixed in the rear sleeve (5), and the other end is fixed in the front sleeve (6). 2. The chair according to claim 1 is characterized in that one end of the electric telescopic push rod (3) in the front sleeve (6) is set as the telescopic end, a protective sleeve (61) is provided in the front sleeve (6) for the telescopic end to extend into, and the inner wall of the protective sleeve (61) is provided with a protective ridge (62) that abuts against the telescopic end. 3. The chair according to claim 1 is characterized in that the front sleeve (6) and the rear sleeve (5) are connected to each other through a release sleeve (4), and the release sleeve is made of wear-resistant plastic material, and a supporting ridge (51) for supporting the release sleeve (4) is provided between the inner wall of the rear sleeve (5) and the outer wall of the release sleeve (4). 4. The chair according to claim 3 is characterized in that: the relaxation sleeve (4) includes an upper cover plate (41) and a lower cover plate (42), the upper cover plate (41) and the lower cover plate (42) are relatively covered on the outside of the front sleeve (6), the upper cover plate (41) and the lower cover plate (42) are inserted into the pits (43) on the upper and lower sides of the front sleeve (6) through positioning columns, and gaps are left on both sides to form a slide groove (44), and two guide convex rails (52) are provided on the inner wall of the rear sleeve (5) to cooperate and insert into the two slide grooves. 5. The chair according to any one of claims 1 to 4, characterized in that: a slot (65) for mounting the lumbar support 12 is provided on the front sleeve (6), sliding links (66) are provided on both sides of the end of the front sleeve (6) in the slot (65), longitudinal long holes (67) are provided on both sides of the lumbar support (12) matched with the sliding links (66), a lifting positioning slot (68) is provided between the two longitudinal long holes (67) on the front side of the lumbar support (12), the end of the sliding link (66) extends from the longitudinal long hole (67) into the lumbar support (12) and is fixedly mounted on the fixing plate (69), a slider (610) is installed on the inner side of the fixing plate (69), and the slider (610) is placed in the lifting positioning slot; a longitudinal rack (611) is provided on one side of the lifting positioning slot (68), and a V-shaped limit card (612) matched with the longitudinal rack (611) is installed on the slider (610) through a rotating shaft; the V The shaped limit clamp (612) comprises two support arms, one of which is against the limit piece on the slider (610), and the outer side of the other support arm is provided with teeth (613) that cooperate with the longitudinal rack (611), and the angle between the two support arms has a certain compression deformation, and the rebound force is used to provide a mutually supporting and positioning clamping force between the longitudinal rack (611) and the teeth (613). 6. The chair according to claim 1, characterized in that: the chair is equipped with a headrest (7), the back of the bottom of the headrest (7) is against the chair back (11); there is also a mounting seat (8), the bottom of the mounting seat (8) is fixedly installed on the rear side of the chair back (11), the top of the mounting seat (8) is higher than the chair back (11), and a connecting portion (81) extends forward from the top of the mounting seat (8), and the end of the connecting portion (81) away from the mounting seat (8) is hingedly connected to a pillow seat (9), the headrest (7) is located on the front side of the chair back and is installed on the end of the pillow seat (9) away from the connecting portion, the bottom of the headrest (7) is lower than the top of the chair back (11), so that the headrest (7) and the chair back (11) overlap each other in upper and lower parts. 7. The chair according to claim 6, characterized in that: the connecting portion (81) is hinged to the pillow seat (9); two rotating shafts (93) opposite to each other are arranged on the pillow seat (9); the connecting portion (81) is provided with a connecting ear (82) sleeved on the rotating shaft (93); the pillow seat (9) is provided with a multi-position fan-shaped convex tooth (94); and the connecting portion (81) is provided with an elastic limiter (83) matched with the fan-shaped convex tooth (94). 8. The chair according to claim 6 is characterized in that: the headrest (7) is connected to the pillow seat (9) in a liftable manner; a vertical guide groove is provided in the headrest (7), positioning racks (71) are provided on both sides of the guide groove, and the adjustment block (92) is placed in the guide groove, and an elastic protrusion is provided on the adjustment block (92), and the elastic protrusion and the positioning rack (71) are mutually engaged, and a headrest longitudinal long hole (72) that passes through the back of the headrest (7) is provided on the back of the guide groove, and the pillow seat (9) is provided with a pillow seat connecting rod (91), and the pillow seat connecting rod (91) extends from the headrest longitudinal long hole (72) into the guide groove and is fixedly connected to the adjustment block (92). 9. A chair according to claim 6, 7 or 8, characterized in that: a concave mounting groove (73) is provided on the surface of the headrest (7), the vibration massager (30) is installed in the mounting groove (73), a supporting member (74) is provided on the outer side of the vibration massager (30), the peripheral edge of the supporting member (74) cooperates with the groove edge of the mounting groove (73) and together with the remaining surface of the headrest (7) except the mounting groove (73) constitutes the supporting surface of the headrest, the supporting member (74) has a soft part (75), and the massage head of the vibration massager (30) corresponds to the soft part (75). 10. The chair according to claim 1, characterized in that: the top of the chair back (11) is a shoulder pillow (10), and two shoulder pillows (10) are respectively installed on both sides of the front side of the top of the chair back (11); the shoulder pillow (10) is arc-shaped and both sides are bent forward.