CN213282247U - Lumbar support unit for a seat - Google Patents

Abstract

The utility model discloses a waist supporting unit for a seat, which comprises a waist top supporting component and a waist clamping component rotationally connected with the waist top supporting component, wherein the waist clamping component can rotate relative to the waist top supporting component to realize the switching between an open state and a closed state; the waist supporting member comprises a plurality of back supporting waist sheets which are arranged at intervals and extend along the same direction, and two adjacent back supporting waist sheets are connected through a connecting piece; the waist clamping component is of a frame type structure, a plurality of through grooves extending along the same direction are formed in the waist clamping component, and corresponding back top waist sheets correspond to the through grooves one by one; when the waist clamping component is in a closed state, at least one part of the back top waist sheet is positioned in the corresponding through groove or is exposed out of the through groove forwards; this waist centre gripping component can the selectivity switching, and the user can select according to oneself use needs, uses more in a flexible way.

Description

Lumbar support unit for a seat

Technical Field

The utility model relates to a seat field, more specifically the utility model relates to a lumbar support unit for seat that says so.

Background

The traditional chair generally has a seat for a human body to sit down, when the human body sits on the seat, the body weight is supported by the seat, the human body physiological structure shows that the spine of the human body bears the upper body of the human body such as the head, the back and the like, and the load is quite large because the lumbar is at the lowest position of the spine, and the junction of the movable section and the fixed section is easier to be damaged. If the sitting posture of the human body is incorrect, the human body is easy to have soreness and backache except for looking mentally, even the spine and the nerve are pressed, and the health is finally affected.

The patent document' 201210211751.9 discloses a chair structure that a person sits on a chair seat, the chair seat moves downwards by gravity, and waist supports at two sides of the chair seat can support the waist of the user to play a role of supporting. However, the seat structure described above still has the following problems:

1. as long as the user sits on the seat, the waist support of both sides must be drawn in and is realized pressing from both sides tightly, and the user can't carry out the self-regulation according to the demand, and when the user need not the waist support and props up user's waist and realize the physiotherapy, the user can not close this function, and the crowd that is suitable for is too narrow, and the general use is lower relatively.

2. The lower part of the cushion is provided with a link mechanism, the cushion is in a suspension shape, and the structure and the material of the cushion are greatly limited in order to ensure the supporting effect.

Further, the patent numbers are: the utility model discloses a CN201821119123.7 utility model discloses an office chair waist support mechanism, which comprises a bottom plate, wherein one side of the bottom plate is provided with two first support columns, a second support column is arranged below the first support columns, the first support columns are connected with a first connecting block through hinges, the second support columns are connected with a second connecting block through hinges, one side of the first connecting block is provided with an elastic waist support, the inner side of the elastic waist support is provided with a sponge pad, the elastic waist support is connected with the bottom plate through springs, the number of the springs is three, and the bottom plate is connected with an installation frame through a sliding block; the waist support can be supported by the springs, because the elastic waist supports are rotatably connected with the bottom plate, when a person leans against the elastic waist supports, one ends of the two elastic waist supports move backwards, the other ends wrap the waist of the person, and the comfort of the waist supports is improved by the sponge cushion; the other end of the elastic waist rest is designed into an arc hook shape, so that the waist of a human body, namely the position of a kidney is clamped, and a certain supporting effect is achieved; however, the waist rest is designed to be in a fixed shape, and the user cannot close the waist clamping function when the user does not want to apply the function.

Disclosure of Invention

In order to solve the above technical problem, an object of the present invention is to provide a lumbar support unit, which is provided with a lumbar support member and a lumbar clamping member rotatably connected thereto, wherein the lumbar clamping member can be selectively opened and closed, and when closed, the lumbar clamping member rotates to be integrated with the lumbar support member, so that when the lumbar support unit is mounted on a seat, the lumbar support member only plays a role of supporting the lumbar, i.e. the lumbar support unit has the functions of wrapping the waist and supporting the waist; when the waist clamping member is turned over and opened, the waist supporting member plays a waist supporting function, and the waist clamping member plays a waist clamping function; the user can select according to the use requirement.

Solve the technical problem, the utility model discloses take following technical scheme:

the lumbar support unit for the seat comprises a lumbar top support member and a lumbar clamping member which is rotatably connected with the lumbar top support member, wherein the lumbar clamping member can rotate relative to the lumbar top support member to realize the switching between an open state and a closed state; the waist supporting member comprises a plurality of back supporting waist sheets which are arranged at intervals and extend along the same direction, and two adjacent back supporting waist sheets are connected through a connecting piece; the waist clamping component is of a frame type structure, a plurality of through grooves extending in the same direction are formed in the waist clamping component, and the corresponding back top waist sheets correspond to the through grooves one by one; when the waist clamping component is in a closed state, at least one part of the back-top waist sheet is positioned in the corresponding through groove or is exposed out of the through groove forwards.

When the user does not use waist clamping component centre gripping waist, when the user rides, the back only can push up the waist piece laminating with the back, and can not contact with waist clamping component to this reduces the unsmooth sense of user back contact surface, improves user's use comfort.

In a further aspect, the through slots and the back top waist panel both extend in the transverse direction.

In a further aspect, when the waist holding member is in the closed state, the back top waist panel penetrates the through groove forward or the front end surface of the back top waist panel is exposed out of the notch of the through groove forward. Thus, only the waist supporting member exerts the waist supporting function when the waist holding member is in the closed state.

In a further scheme, the connecting pieces are positioned on the back surfaces of the back top waist pieces, and avoidance grooves are formed in the connecting pieces positioned between every two adjacent back top waist pieces along the width direction of the connecting pieces; the position that lies in between two adjacent logical grooves on the waist centre gripping component constitutes the rib, when the waist centre gripping component is in the closure state, the rib is in dodge the inslot, accomodate the rib, avoid forming the interference.

In a further scheme, the connecting piece adopts a single connecting piece, and the avoiding groove is formed by bending the connecting piece backwards.

In a further aspect, the lumbar support member is also of a frame-type construction, and the connector is a connecting piece or strip integrally formed with the lumbar back panel.

In a further aspect, a first limit stopper for limiting a rotation angle of the lumbar holding member with respect to the lumbar top support member beyond a preset range is provided at a rotational connection of the lumbar holding member and the lumbar top support member.

In a further scheme, the waist supporting member is provided with a first fixing member, the waist clamping member is provided with a first rotating member, and a pin shaft penetrates through the first rotating member and the first fixing member to realize relative rotation; the first limiting part is a screw, the screw is in threaded connection with the waist top support component and is limited, one end of the screw abuts against the waist clamping component, or the screw is in threaded connection with the waist clamping component and is limited, one end of the screw abuts against the waist top support component. The user can be according to the size of self size, and the screw is independently turned round, and adjusting screw surpasss the length of first mounting, realizes then that waist centre gripping component supports the regulation of the spacing turned angle of component for waist top for this seat is applicable to the user of each size.

In a further scheme, the waist clamping component is rotatably connected with the side edge of the waist top bracing component, and in the opening state, the waist clamping component is in a forward extending state; and the length of the waist clamping component is 8-30cm along the front and back direction. The waist clamping component can be in better contact with the left side and the right side of the waist of a human body or forwards exceed the waist of the human body when the waist clamping component is in an open state, so that the contact area between the waist clamping component and the waist side is increased, and a more obvious and better clamping effect is achieved.

In a further aspect, and in the front-to-rear direction, the length of the waist gripping member is preferably 15-25 cm. Can meet the requirements of most people.

Advantageous effects

The waist support unit of the utility model is provided with a waist top support component and a waist clamping component which is rotationally connected with the waist top support component, the waist clamping component can be selectively opened and closed, when the waist clamping component is closed, the waist clamping component rotates to be integrated with the waist top support component, so that when the waist support unit is arranged on a seat for application, the waist top support component only plays a role of supporting the waist, namely the waist support unit has the functions of wrapping the waist and supporting the waist; when the waist clamping member is turned over and opened, the waist supporting member plays a waist supporting function, and the waist clamping member plays a waist clamping function; the user can select according to the use requirement.

Drawings

FIG. 1 is a schematic view of the waist support seat according to embodiment 1 with the waist holding members closed;

FIG. 2 is a schematic view of the lumbar support seat of embodiment 1 with the lumbar holding member in an open state;

FIG. 3 is a schematic view of the waist support seat of embodiment 1 from a back perspective with the waist holding members in a closed state;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a schematic structural view of a waist supporting member in embodiment 1;

FIG. 6 is a comparison between the front and rear waist brace members of example 1;

FIG. 7 is a schematic structural view of a waist holding member in embodiment 1;

FIG. 8 is a plan view of the lumbar support seat of embodiment 1 with the lumbar clamping member in an open state and unclamped;

FIG. 9 is a plan view of the lumbar support seat of embodiment 1 held with the lumbar holding member in an open state;

FIG. 10 is a schematic view and a partially enlarged view of the waist support seat of embodiment 1 from another perspective with the waist holding member in a closed state;

FIG. 11 is a schematic view showing the configuration of the lumbar support seat of embodiment 2 with the lumbar holding member in a closed state;

fig. 12 is an overall schematic view of the waist support seat of embodiment 1.

The reference numerals in the schematic drawings illustrate:

1-support carrier, 2-lumbar support unit, 21-lumbar support member, 211-medial region, 212-lateral region, 213-lumbar plate, 214-connector, 2141-avoidance groove, 22-lumbar clamping member, 221-through groove, 222-rib, 3-first fastener, 4-first rotating member, 5-first stopper, 6-second fastener, 7-second rotating member, 8-second stopper, 9-pin, 10-sliding mechanism, 101-upper support block, 102-upper sliding groove, 11-first elastic member, 12-second elastic member, 13-seat, back support 30, chassis 31.

Detailed Description

For a further understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

The present invention relates to the position description based on the lumbar support unit being mounted on the seat, and the description is made under the normal use state, the seat front, i.e. the seat front, is in the front position, and the lumbar support unit is mounted at the upper rear position of the seat.

Example 1: the utility model discloses a lumbar support unit is the main component of waist support seat, and the following is whole to be described in detail waist support seat:

referring to fig. 1-10, the present embodiment provides a waist support chair, which includes a support carrier 1 directly or indirectly connected to a chair seat of the chair and in an upright state; the supporting carrier 1 can be a back support, the lower end of the back support is directly connected to the chair seat, and the supporting carrier can also be connected to a chassis below the chair seat; of course, the support carrier 1 can also be a backrest, which can be connected directly to the seat or can be connected to the seat by a separately provided back support.

In the present embodiment, the support carrier 1 is a backrest, which is connected to the bottom plate 31 of the seat 13 by a back support 30, as shown in fig. 12, to perform a tilting movement of the backrest; more specifically, the backrest is divided into an upper backrest 1a and a lower backrest 1b, and two lumbar support units 2 are provided on the lower backrest 1b in bilateral symmetry. In the present embodiment, the lumbar support unit 2 includes a lumbar top support member 21 and a lumbar clamping member 22. As shown in fig. 1, 3 and 4, the lumbar support member 21 is pivotally connected to the lower back 1b of the support carrier 1, and a fulcrum 20 is formed at the pivotal connection. Specifically, the waist supporting member 21 is provided with a second rotating member 7 at the pivot 20, the back support 1 is provided with a second fixing member 6, and the second rotating member 7 and the second fixing member 6 are provided with a pin shaft 9 through to realize relative rotation.

Meanwhile, the waist top support member 21 has an inner region 211 and an outer region 212 respectively arranged at the left and right sides of the fulcrum 20, namely, the middle is inner and the two sides are outer along the width direction of the seat 13; the lumbar holding member 22 is hinged with the outer side region 212 of the lumbar top support member 21 to enable the lumbar holding member 22 itself to be rotatable relative to said lumbar top support member 21. Specifically, as shown in fig. 5 and 7, the first fixing part 3 is disposed in the outer region 212 of the waist top supporting member 21, the first rotating part 4 is disposed on the waist clamping member 22, and the pin 9 penetrates through the first rotating part 4 and the first fixing part 3 to realize relative rotation, so that the waist clamping member 22 can rotate relative to the waist top supporting member 21 to realize the switching between the open state and the closed state. The waist holding member 22 is rotatably connected to the side edge of the waist top support member 21, which is the edge of the outer region 212; in the open state, the lumbar holding member 22 is in a state of extending forward; and the length of the waist holding member 22 in the front-rear direction is 18 to 22 cm.

More specifically, the first fixing member 3 is two parallel clamping pieces, the first rotating member 4 is a rotating block, the rotating block is located between the two parallel clamping pieces, and a pin shaft 9 penetrates through the rotating block to realize relative rotation. In this embodiment, in the open state, as shown in fig. 2, the waist sandwiching member 22 is opened away from the inner region 211 of the waist support member 21. In the closed state, as shown in fig. 1, the waist sandwiching member 22 is close to the inner region 211 of the waist top supporting member 21 or overlaps with the inner region 211 of the waist top supporting member 21.

As shown in fig. 9, in the front-rear direction of the seat 13, the front of the seat 13 is outward, and the rear of the seat 13 is inward; when the user leans against the seat, the support carrier 1, i.e., the backrest, is subjected to a force, and the inner side region 211 of the lumbar support member 21 is subjected to a force, which presses inward, i.e., rearward, to turn the outer side region 212 of the lumbar support member 21 outward. When the lumbar holding member 22 is in the open state and the outer region 212 of the lumbar top support member 21 is turned outward, the outer region 212 of the lumbar top support member 21 brings the lumbar holding member 22 to rotate toward the center of the support carrier 1, i.e., the backrest, and to approach each other.

When the user leans against the backrest, the backrest is stressed, that is, the inner side region 211 of the lumbar support member 21 is pressed backwards, and the lumbar support member 21 is turned over to support the waist of the user in a folded manner. Meanwhile, the waist top support member 21 drives the waist top support members 21 with both sides in the open state to rotate towards the center direction of the support carrier 1, so as to clamp the waist on both sides of the user, thereby playing a role of waist clamping.

In addition, the chair in the scheme drives the waist clamping member 22 to rotate through the waist supporting member 21 on the supporting carrier 1, the sitting part is the chair seat 13, other transmission mechanisms do not need to be added, the chair seat 13 is directly connected with the chassis at the lower part for supporting, the chair seat 13 comprises a seat plate and a seat cushion above the seat plate, and the seat cushion can be made of any materials and in any shape and size according to the preference of a user.

As a preferred embodiment, the lumbar holding member 22 is of a frame-like construction, as shown in fig. 7. Specifically, in the present embodiment, the lumbar holding member 22 comprises a rectangular plate material, but it is understood that the specific shape thereof is not limited thereto, and may be circular, oval, or the like. The rectangular plate is provided with a plurality of through grooves 221 extending along the same direction.

Correspondingly, as shown in fig. 5, the lumbar support member 21 includes a plurality of back top waist panels 213 disposed at intervals and extending along the same direction, two adjacent back top waist panels 213 are connected by a connecting member 214, and the back top waist panels 213 correspond to the through slots 221. When the waist holding member 22 is in the closed state, at least a part of the back top waist panel 213 is positioned in the corresponding through groove 221 or exposed forward from the through groove 221, and the through groove 221 functions as an escape. If the back top waist panel 213 is located in the corresponding through groove 221, the back top waist panel 213 can be used together with the waist holding member 22 for the user to rest on to receive the pressure of the user. If the back top waist panel 213 is exposed forward from the through groove 221, the back of the user only fits to the back top waist panel 213 and does not contact the waist holding member 22 when the user is leaning on the back, thereby reducing the concave-convex feeling of the back contact surface of the user. The use comfort of the user is improved.

In the present embodiment, as shown in fig. 1, 10, and 11, when the waist holding member 22 is in the closed state, the back top waist panel 213 is exposed forward through the through-groove 221 or the front end surface of the back top waist panel 213 is exposed forward to the notch of the through-groove 221. Further, in order to avoid interference between the waist holding member 22 and the waist top supporting member 21, the connecting member 214 is located on the back surface of the back top waist piece 213, and the connecting members 214 located between two adjacent back top waist pieces 213 are each provided with an escape groove 2141 along the width direction thereof. The rib 222 is formed at a position between two adjacent through grooves 221 of the waist holding member 22, and when the waist holding member 22 is in the closed state, the rib 222 is located in the escape groove 2141. And in order to form the escape groove 2141, the connection member 214 is a single connection member 214, and the escape groove 2141 is formed by bending the connection member 214 backward. In this embodiment, the through-groove 221 and the back top waist panel 213 extend in the transverse direction. However, it is also possible that both the through slots 221 and the back top waist panel 213 extend in the longitudinal direction.

In addition, in the present embodiment, as shown in fig. 4 and 5, in order to prevent the user from rotating the waist clamping member 22 so that the waist clamping member 22 rotates relative to the waist top supporting member 21 beyond the stroke range, a first limiting member 5 for limiting the rotation angle of the waist clamping member 22 relative to the waist top supporting member 21 beyond a preset range is disposed at the hinge joint of the waist clamping member 22 and the waist top supporting member 21.

As a preferred embodiment, the first limiting member 5 in this embodiment is a screw, and the screw is screwed to the connecting member 214, and one end of the screw abuts against the waist clamping member 22 during limiting, specifically, the first rotating member 4 of the waist clamping member 22. When the waist clamping member 22 rotates to a designated angle relative to the waist top supporting member 21, one end of the screw abuts against the waist clamping member 22 to realize limiting. And the user can be according to the size of self size, independently turn round the screw, and the adjusting screw surpasss the length of first mounting 3, realizes then that waist centre gripping component 22 is for the spacing turned angle's of waist shore member 21 regulation for this seat is applicable to the user of each size. Although the screw is screwed to the connector 214 in this embodiment, the screw may be screwed to the lumbar holding member 22 and one end of the screw may abut against the lumbar support member 21. It is easy to understand that although the present embodiment adopts a screw as the first limiting member 5, it is easy to understand that other limiting members in the prior art, such as a ratchet mechanism, can be adopted under the condition that the rotation angle of the waist clamping member 22 relative to the waist supporting member 21 is not beyond the preset range.

Similarly, the waist top support member 21 is provided with a second limiting part 8 at the fulcrum 20 for limiting the rotation angle of the waist top support member 21 relative to the support carrier 1 to exceed a preset range; as a specific embodiment, the second position-limiting element 8 is a position-limiting post, which is fixedly disposed on the second rotating element 7, and when the waist top-supporting member 21 rotates to a predetermined limited angle relative to the supporting carrier 1, the position-limiting post abuts against the second fixing element 6 to realize position limitation.

In this embodiment, the waist supporting member 21 is made of an elastic material, and specifically, the waist supporting member 21 is made of plastic. Referring to fig. 6, when no external force is applied, the whole waist supporting member 21 is protruded forward in an arc shape. When the waist supporting member 21 is subjected to a rearward pressing force, the waist supporting member 21 is stretched in the longitudinal direction along the support carrier 1 (i.e., the waist back panel 213 and the connecting member 214 are deformed to be stretched in the longitudinal direction). Make waist top stay component 21 and user's back closely laminate, the comfort level is higher, and in the process that waist top stay component 21 extends at the longitudinal direction along supporting carrier 1, give user's back a power opposite with the gravity direction, also played the effect of certain bearing to the user, alleviated lumbar vertebrae atress.

In order to facilitate the lumbar support member 21 to extend in the longitudinal direction along the back frame 1, in the present embodiment, still further, at least one of the upper and lower ends of the lumbar support member 21 is slidably connected to the support carrier 1 in the longitudinal direction. Specifically, as shown in fig. 10, the upper end of the lumbar top support member 21 is slidably and pivotally connected to the support carrier 1, and the lower end of the lumbar top support member 21 is rotatably connected to the support carrier 1 and is kept relatively fixed to the support carrier 1 in the longitudinal direction. More specifically, the upper portion of the support carrier 1 is slidably connected to the upper end of the lumbar support member 21 by a sliding mechanism 10. The sliding mechanism 10 includes an upper support block 101 and an upper chute 102, the upper end of the lumbar support member 21 is pivotally connected to the upper support block 101 to form the pivot 20, and the upper support block 101 is clamped in the upper chute 102 and is slidably connected to the upper chute 102. Meanwhile, the lower part of the support carrier 1 and the lower end of the waist top support member 21 are respectively provided with a lower support block and a third rotating part, and a rotating shaft penetrates through the lower support block and the third rotating part to realize relative rotation. In this embodiment, the lower supporting block and the third rotating member are the second fixing member 6 and the second rotating member 7. When the waist supporting member 21 is subjected to a force of pressing backward, the upper stay 101 slides upward relative to the upper slide groove 102, and the lower stay and the third rotating member have a rotating shaft penetrating therethrough to realize relative rotation, but remain stationary in the longitudinal direction. Thereby, the lumbar support member 21 is stretched in the longitudinal direction along the back bracket 1.

Easy understanding, the user normally sits on the seat, and user's lumbar vertebrae strain can be caused after taking for a long time to its lumbar vertebrae atress, and through the waist of 21 centre gripping users of waist shore member in this scheme, applys certain clamping-force in waist department, waist shore member 21 extends at longitudinal direction along supporting the carrier, and waist centre gripping member can rebound promptly, and human waist is pasting waist centre gripping member, and waist centre gripping member can apply an ascending supporting force to human waist, offsets with user self gravity part, plays and alleviates the lumbar vertebrae atress, alleviates the effect of lumbar vertebrae strain. Similarly, the waist top supporting member 21 rotates towards the center of the supporting carrier 1 to clamp the waist at the two sides of the user, and also provides an upward supporting force for the waist of the patient, so as to relieve the stress of the lumbar.

Meanwhile, when the user does not need the lumbar clamp, the seat only needs to rotate the lumbar clamp member 22 so that the lumbar clamp member 22 coincides with the inner side region 211 of the lumbar top support member 21. Can adjust by oneself according to user's demand, convenient and fast, the suitability is high.

As shown in fig. 4, a first elastic element 11 is further disposed between the waist top supporting member 21 and the back frame 1, and when the inner side region 211 of the waist top supporting member 21 loses the action of the backward external force, the first elastic element 11 drives the waist top supporting member 21 to return. In a specific embodiment, the first elastic element 11 is a torsion spring, the torsion spring is sleeved on the pin 9 between the second fixing element 6 and the second rotating element 7, and two ends of the torsion spring are respectively fixed to the second fixing element 6 and the second rotating element 7. When the waist supporting member 21 rotates relative to the back frame 1, the second fixing member 6 and the second rotating member 7 rotate relative to each other, and the torsion spring is deformed. When the waist top support member 21 loses the external force, the torsion spring rebounds to drive the second fixing piece 6 and the second rotating piece 7 to reset.

Example 2: referring to fig. 11, the main difference between the present embodiment and the above embodiment 1 is that the two waist top supporting members 21 are connected by the second elastic member 12, and the second elastic member 12 and the waist top supporting member 21 are integrally formed.

Example 3: the main difference between this embodiment and the above embodiment 1 is that in this embodiment, the waist top supporting members 21 are connected by at least one link (not shown), and both ends of the link are rotatably connected to one waist top supporting member 21.

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 (10)

1. A lumbar support unit for a seat, comprising: the waist clamping component can rotate relative to the waist top supporting component to realize the switching between an open state and a closed state; the waist supporting member comprises a plurality of back supporting waist sheets which are arranged at intervals and extend along the same direction, and two adjacent back supporting waist sheets are connected through a connecting piece; the waist clamping component is of a frame type structure, a plurality of through grooves extending in the same direction are formed in the waist clamping component, and the corresponding back top waist sheets correspond to the through grooves one by one; when the waist clamping component is in a closed state, at least one part of the back-top waist sheet is positioned in the corresponding through groove or is exposed out of the through groove forwards.

2. The lumbar support unit for a seat according to claim 1, wherein said channel and back top waist panel each extend in a transverse direction.

3. The lumbar support unit of claim 1, wherein the lumbar support member is configured such that the lumbar support portion is forwardly exposed through the channel or a front end surface of the lumbar support portion is forwardly exposed to the opening of the channel when the lumbar clamping member is in the closed position.

4. The lumbar support unit for a seat according to claim 1, wherein the connecting piece is located on the back surface of the back top waist piece, and the connecting pieces located between two adjacent back top waist pieces are provided with avoidance grooves along the width direction of the connecting pieces; the position that lies in between two adjacent logical grooves on the waist centre gripping component constitutes the rib, when the waist centre gripping component is in the closed condition, the rib is in dodge the inslot.

5. The lumbar support unit of claim 4, wherein said connecting member is a single connecting member, and said escape slot is formed by bending said connecting member rearward.

6. A lumbar support unit for seats according to claim 1, wherein the lumbar support member is also of frame-like construction and the connector is a connecting tab or strip formed integrally with the lumbar dorsal panel.

7. The lumbar support unit for a seat according to claim 1, characterized in that a first stopper for limiting a rotation angle of the lumbar holding member with respect to the lumbar top support member beyond a preset range is provided at a rotational connection of the lumbar holding member and the lumbar top support member.

8. The lumbar support unit of claim 7, wherein the lumbar support member is provided with a first fixed member, the lumbar clamping member is provided with a first rotating member, and the first rotating member and the first fixed member are provided with a pin shaft in a penetrating manner so as to realize relative rotation; the first limiting part is a screw, the screw is in threaded connection with the waist top support component and is limited, one end of the screw abuts against the waist clamping component, or the screw is in threaded connection with the waist clamping component and is limited, one end of the screw abuts against the waist top support component.

9. The lumbar support unit of claim 1, wherein the lumbar holding member is pivotally connected to the side edge of the lumbar top support member, and in the open position, the lumbar holding member is in a forwardly extending position; and the length of the waist clamping component is 8-30cm along the front and back direction.

10. The lumbar support unit for a seat according to claim 1, wherein the lumbar clamping member has a length of 15-25cm in the fore-aft direction.

Images