Chair and waist rest adjusting mechanism thereof

Abstract

The utility model discloses a chair and a waist rest adjusting mechanism thereof. The waist rest adjusting mechanism comprises a mounting bracket, a waist rest, a two-way screw rod, a first driving rod and a second driving rod, the waist rest is mounted on the mounting bracket in a manner of moving back and forth; the bidirectional screw is rotatably mounted on the mounting support and comprises a first threaded portion and a second threaded portion which are opposite in thread, one end of the first driving rod is connected with the first threaded portion, the other end of the first driving rod is hinged to the waist rest, one end of the second driving rod is connected with the second threaded portion, and the other end of the second driving rod is hinged to the waist rest. The motor is mounted on the mounting bracket and is connected with the two-way screw rod; the two-way screw can drive the first driving rod and the second driving rod to get close to each other or get away from each other, and then the waist rest moves front and back. Therefore, the stress of the waist rest is directly transmitted to the body of the two-way screw through the driving rods, and the waist rest is driven to move through the two ends of the first driving rod and the second driving rod, so that the stability and the service life of the chair are higher and more stable.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of home, especially a chair and its waist rest adjusting mechanism. BACKGROUND

[0002] The waist rest of the seat mainly is for the human body waist, provides more comfortable support for the human waist, provides more comfortable support effect for the office crowd, effectively alleviates the waist tired and tired brought by long sitting.

[0003] The prior art with the publication number CN221865238U discloses a kind of adjusting structure of seat waist rest, including one end with the rear sleeve of fixed support, the rear sleeve other end sleeve front sleeve, the front sleeve is away from the rear sleeve one end with waist rest and is connected with the connecting seat, the front sleeve is installed with the electric telescopic push rod that can push the front sleeve relative to the rear sleeve moves back and forth, the electric telescopic push rod one end is fixed in the rear sleeve of backrest end, other end is fixed in the front sleeve of waist rest end. Since the rear sleeve other end sleeve front sleeve, electric telescopic push rod pushes front sleeve, the end of front sleeve and waist rest as a whole, waist rest moves along with front sleeve, so that waist rest moves more stably.

[0004] In prior art, waist rest moves back and forth by an electric telescopic push rod, and then the pressure and thrust received by waist rest are all applied to the thread of electric push rod, so that the thread is subjected to long-term stress, resulting in large thread friction distance loss, and then electric push rod is prone to failure, reducing the stability of chair. UTILITY MODEL CONTENTS

[0005] In order to solve the problem of low stability of the component for controlling the movement of the waist rest in the prior art, the purpose of the utility model is to provide a chair and its waist rest adjusting mechanism.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solution: a waist rest adjusting mechanism, comprising a mounting bracket, a waist rest, a bidirectional screw, a first drive rod and a second drive rod; the waist rest is installed on the mounting bracket in a movable manner; the bidirectional screw is rotatably installed on the mounting bracket, the bidirectional screw comprises a first threaded portion and a second threaded portion with opposite threads, one end of the first drive rod is connected with the first threaded portion, the other end of the first drive rod is hingedly connected with the waist rest, one end of the second drive rod is connected with the second threaded portion, the other end of the second drive rod is hingedly connected with the waist rest, and a motor is installed on the mounting bracket and connected with the bidirectional screw; the bidirectional screw can drive the first drive rod and the second drive rod to move closer to each other or move away from each other, thereby moving the waist rest back and forth.

[0007] As a preferred, the first drive rod and the second drive rod are cross arranged.

[0008] Preferably, the rear end of the first driving rod is provided with a third gap, a first nut is located in the third gap, the first nut is hinged to the first driving rod, and the first nut is sleeved on the first threaded part of the bidirectional screw rod.

[0009] Preferably, the connecting seat and the waist support are connected through a first elastic member.

[0010] Preferably, the backrest is further included, the backrest is installed on the mounting support through a second elastic member, and the backrest is located above the waist support.

[0011] Preferably, the mounting support includes a back plate and a first mounting seat, the first mounting seat is fixed to the front end of the back plate, a first accommodating cavity is arranged on the first mounting seat, the first accommodating cavity penetrates the first mounting seat in the front-rear direction, the rear end of the waist support is provided with the connecting seat, the connecting seat is inserted into the first accommodating cavity and is in sliding fit, the first driving rod and the second driving rod are hinged to the connecting seat, and the motor drives the connecting seat to move the waist support through the first driving rod and the second driving rod.

[0012] Preferably, the bottom of the first accommodating cavity is provided with a guide part, the bottom of the connecting seat is provided with a guide groove, and the guide part is inserted into the guide groove and is in sliding fit.

[0013] Preferably, the mounting support further includes a second mounting seat, the second mounting seat is fixed to the back plate, and the second mounting seat is located outside the first mounting seat; a second accommodating cavity with an opening facing forward is arranged on the second mounting seat, a relief hole communicating with the second accommodating cavity is arranged on the side surface of the second mounting seat, the motor is installed in the second accommodating cavity, and the output shaft of the motor is in transmission connection with the bidirectional screw rod through the relief hole.

[0014] Preferably, the mounting support further includes a second mounting seat, the second mounting seat is fixed to the back plate, and the second mounting seat is located outside the first mounting seat; a second accommodating cavity with an opening facing forward is arranged on the second mounting seat, a relief hole communicating with the second accommodating cavity is arranged on the side surface of the second mounting seat, the motor is installed in the second accommodating cavity, and the output shaft of the motor is in transmission connection with the bidirectional screw rod through the relief hole.

[0015] A chair includes the above-mentioned waist support adjusting mechanism.

[0016] The technical scheme of the utility model has the advantages that the advancing directions of the bidirectional screw rod and the waist support are different, so that the stress of the waist support is directly transmitted to the body of the bidirectional screw rod through the driving rods instead of directly acting on the threads of the bidirectional screw rod, thereby improving the stability and service life of the chair; the waist support is driven to move by the first driving rod and the second driving rod, so that the movement of the waist support is more stable, the stress of the waist support can be dispersed through the two driving rods, thereby reducing the single-point stress of the bidirectional screw rod and improving the reliability of the chair. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1Structure diagram of backrest and lumbar support adjusting mechanism;

[0018] Figure 2 Structure diagram of lumbar support adjusting mechanism;

[0019] Figure 3 Structure diagram of lumbar support adjusting mechanism after removing back plate;

[0020] Figure 4 Structure diagram of connection of back plate, motor, first driving rod, second driving rod and bidirectional screw rod;

[0021] Figure 5 Structure diagram of lumbar support;

[0022] Figure 6 Structure diagram of first mounting base;

[0023] Figure 7 Structure diagram of connection of motor, first driving rod, second driving rod and bidirectional screw rod.

[0024] Reference signs: 1, backrest;

[0025] 2, mounting support; 21, back plate; 22, shell; 23, first mounting base; 24, second mounting base;

[0026] 3, lumbar support; 31, first elastic member; 32, connecting seat; 33, third accommodating cavity; 34, second avoiding groove; 35, guide groove; 36, hinged hole;

[0027] 4, backrest; 41, second elastic member;

[0028] 71, motor; 72, first bearing seat; 73, second bearing seat; 74, bidirectional screw rod; 75, first nut; 76, second nut; 77, first driving rod; 78, second driving rod. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0030] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0031] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise stated, the meaning of "a plurality of" is two or more, unless otherwise explicitly limited.

[0032] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0033] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or it can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and oblique above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical direction of the first feature below and oblique below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature. Embodiment

[0034] As Figures 1 to 7 A chair and its lumbar support adjusting mechanism are shown, a lumbar support adjusting mechanism, comprising a mounting bracket 2, a lumbar support 3, a bidirectional screw rod 74, a first drive rod 77 and a second drive rod 78; the lumbar support 3 is installed on the mounting bracket 2 in a movable manner;

[0035] The bidirectional screw 74 is rotatably installed on the mounting bracket 2, the bidirectional screw 74 comprises a first threaded part and a second threaded part with opposite threads, one end of the first driving rod 77 is connected with the first threaded part, the other end of the first driving rod 77 is hingedly connected with the lumbar support 3, one end of the second driving rod 78 is connected with the second threaded part, the other end of the second driving rod 78 is hingedly connected with the lumbar support 3, and the motor 71 is installed on the mounting bracket 2 and connected with the bidirectional screw 74; the bidirectional screw can drive the first driving rod and the second driving rod to move close to or away from each other to move the lumbar support forward and backward.

[0036] In this way, the advancing direction of the bidirectional screw and the lumbar support is different, so that the stress of the lumbar support is directly transmitted to the body of the bidirectional screw through the driving rods, instead of directly acting on the threads of the bidirectional screw, thereby improving the stability and service life of the chair; and the lumbar support is moved by the first driving rod and the second driving rod at both ends, so that the movement of the lumbar support is more stable, the stress of the lumbar support can be dispersed through the two driving rods, thereby reducing the single-point stress of the bidirectional screw and improving the reliability of the chair.

[0037] In this embodiment, the mounting bracket 2 comprises a back plate and a first mounting seat 23, the first mounting seat 23 is fixed to the front end of the back plate 21, the first mounting seat 23 is provided with a first accommodating cavity 231 penetrating through the first mounting seat 23 in the front-rear direction, the rear end of the lumbar support 3 is provided with a connecting seat 32, the connecting seat 32 is inserted into the first accommodating cavity 231 and is in sliding fit, the first driving rod 77 and the second driving rod 78 are hingedly connected with the connecting seat 32, and the motor 71 drives the connecting seat 32 to move the lumbar support 3 through the first driving rod and the second driving rod.

[0038] Further preferably, as shown in Figure 6 the bottom of the first accommodating cavity 231 is provided with a guide part 233; as shown in Figure 5 the bottom of the connecting seat 32 is provided with a guide groove 35; as shown in Figure 3 the guide part 233 is inserted into the guide groove 35 and is in sliding fit.

[0039] Further preferably, as shown in Figures 2 to 4 the mounting bracket 2 further comprises a second mounting seat 24, the second mounting seat 24 is fixed to the back plate 21, and the second mounting seat 24 is located outside the first mounting seat 23; the second mounting seat 24 is provided with a second accommodating cavity opening forward, the side surface of the second mounting seat 24 is provided with an avoiding hole communicating with the second accommodating cavity, the motor 71 is installed in the second accommodating cavity, and the output shaft of the motor 71 penetrates through the avoiding hole and is in transmission connection with the bidirectional screw 74.

[0040] In this embodiment, as shown in Figures 3 to 6As shown, the rear end of the connecting seat 32 is provided with a third accommodating cavity 33, the front end of the first driving rod 77 and the front end of the second driving rod 78 extend into the third accommodating cavity 33. The top of the connecting seat 32 is provided with a hinged hole 36, and the front end of the first driving rod 77 and the front end of the second driving rod 78 are connected to the two hinged shafts respectively.

[0041] In this embodiment, as shown in Figure 3 , Figure 4 and Figure 7 , it further comprises a first bearing seat 72 and a second bearing seat 73, both of which are fixed on the back plate 21, and the two ends of the bidirectional screw rod 74 are rotatably connected to the first bearing seat 72 and the second bearing seat 73 through bearings. As shown in Figure 4 , the front end of the back plate 21 is provided with a first positioning groove and a second positioning groove, and the first bearing seat 72 and the second bearing seat 73 are respectively installed in the first positioning groove and the second positioning groove; as shown in Figure 6 , the rear end of the first mounting seat 23 is provided with two first avoiding grooves 232, both of which are communicated with the first accommodating cavity 231, and the first bearing seat 72 and the second bearing seat 73 are respectively inserted into the two first avoiding grooves 232.

[0042] In this embodiment, the rear end of the connecting seat 32 is provided with two second avoiding grooves 34, which are respectively arranged on the two sides of the third accommodating cavity 33 of the connecting seat 32, and the second avoiding grooves 34 are communicated with the third accommodating cavity 33; when the connecting seat 32 moves to the end of the stroke, the ends of the first driving rod 77 and the second driving rod 78 are respectively inserted into the two second avoiding grooves 34.

[0043] In this embodiment, as shown in Figure 4 and Figure 7 , the first driving rod 77 and the second driving rod 78 are arranged in cross. Among them, the top of the first driving rod 77 is provided with a first notch, the bottom of the second driving rod 78 is provided with a second notch, and the first notch and the second notch are buckled together; thereby making the volume of the first driving mechanism thinner.

[0044] Further preferably, the rear end of the first driving rod 77 is provided with a third notch, the first nut 75 is located in the third notch, the first nut 75 is hinged with the first driving rod 77, and the first nut 75 is sleeved on the first threaded part of the bidirectional screw rod 74; the rear end of the second driving rod 78 is provided with a fourth notch, the second nut 76 is arranged in the fourth notch, the second nut 76 is hinged with the second driving rod 78, and the second nut 76 is sleeved on the second threaded part of the bidirectional screw rod 74.

[0045] In the embodiment, the front end of the connecting seat 32 and the waist rest 3 are connected through the first elastic member 31; in this way, the first elastic member 31 provides the waist rest 3 with elastic supporting force. The first elastic member 31 comprises a spring, the front end of the connecting seat 32 is fixed with a first spring seat, the rear end of the waist rest 3 is fixed with a second spring seat, and the two ends of the spring are connected with the first spring seat and the second spring seat respectively. The first elastic member 31 further comprises a cladding member, which clads the first spring seat, the spring and the second spring seat.

[0046] In the embodiment, the back plate 21 is provided with a peep hole, the rear end of the bidirectional screw rod 74, the rear end of the first driving rod 77 and the rear end of the second driving rod 78 can be exposed from the peep hole.

[0047] In the embodiment, the back plate 21 is provided with a peep hole, the rear end of the bidirectional screw rod 74, the rear end of the first driving rod 77 and the rear end of the second driving rod 78 can be exposed from the peep hole.

[0048] In the embodiment, the back plate 21 is provided with a peep hole, the rear end of the bidirectional screw rod 74, the rear end of the first driving rod 77 and the rear end of the second driving rod 78 can be exposed from the peep hole.

[0049] In the embodiment, the back plate 21 is provided with a peep hole, the rear end of the bidirectional screw rod 74, the rear end of the first driving rod 77 and the rear end of the second driving rod 78 can be exposed from the peep hole.

[0050] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model. The ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments in the range of the utility model without departing from the principles and purposes of the utility model.

Claims

1. A lumbar adjustment mechanism characterized by: The application relates to a lumbar support device, which comprises a mounting bracket (2), a lumbar support (3), a motor (71), a bidirectional screw rod (74), a first driving rod (77) and a second driving rod (78); the lumbar support (3) is movably installed on the mounting bracket (2); The bidirectional screw rod (74) is rotatably installed on the mounting bracket (2), the bidirectional screw rod (74) comprises a first threaded part and a second threaded part with opposite threads, one end of the first driving rod (77) is connected with the first threaded part, the other end of the first driving rod (77) is hingedly connected with the lumbar support (3), one end of the second driving rod (78) is connected with the second threaded part, the other end of the second driving rod (78) is hingedly connected with the lumbar support (3), and the motor (71) is installed on the mounting bracket (2) and connected with the bidirectional screw rod (74); The bidirectional screw rod can drive the first driving rod and the second driving rod to move close to or away from each other, so as to move the lumbar support forward and backward.

2. A lumbar adjustment mechanism according to claim 1, wherein: The first driving rod (77) and the second driving rod (78) are cross arranged.

3. A lumbar adjustment mechanism according to claim 1, wherein: The rear end of the first driving rod (77) is provided with a third gap, a first nut (75) is located in the third gap, the first nut (75) is hingedly connected with the first driving rod (77), the first nut (75) is sleeved on the first threaded part of the bidirectional screw rod (74); the rear end of the second driving rod (78) is provided with a fourth gap, a second nut (76) is arranged in the fourth gap, the second nut (76) is hingedly connected with the second driving rod (78), and the second nut (76) is sleeved on the second threaded part of the bidirectional screw rod (74).

4. A lumbar adjustment mechanism according to claim 1, wherein: The front end of the first driving rod (77) and the front end of the second driving rod (78) are hingedly connected with the connecting seat (32).

5. A lumbar adjustment mechanism according to claim 1 wherein: The application further comprises a backrest (4), the backrest (4) is installed on the mounting bracket (2) through a second elastic element (41), and the backrest (4) is located above the lumbar support (3).

6. A lumbar adjustment mechanism according to claim 1 wherein: The mounting bracket (2) comprises a back plate and a first mounting seat (23), the first mounting seat (23) is fixed to the front end of the back plate (21), a first accommodating cavity (231) is arranged on the first mounting seat (23), the first accommodating cavity (231) penetrates through the first mounting seat (23) in the front-rear direction, the rear end of the lumbar support (3) is provided with a connecting seat (32), the connecting seat (32) is inserted into the first accommodating cavity (231) and is in sliding fit, the first driving rod (77) and the second driving rod (78) are hingedly connected with the connecting seat (32), and the motor (71) drives the connecting seat (32) to move the lumbar support (3) through the first driving rod and the second driving rod.

7. A lumbar adjustment mechanism according to claim 6, wherein: The bottom of the first accommodating cavity (231) is provided with a guide part (233); the bottom of the connecting seat (32) is provided with a guide groove (35); the guide part (233) is inserted into the guide groove (35) and is in sliding fit.

8. A lumbar adjustment mechanism according to claim 6, wherein: The mounting bracket (2) further comprises a second mounting base (24) fixed on the back plate (21), and the second mounting base (24) is located outside the first mounting base (23); the second mounting base (24) is provided with a second accommodating cavity with an opening facing forward, and the side surface of the second mounting base (24) is provided with an avoiding hole in communication with the second accommodating cavity; the motor (71) is mounted in the second accommodating cavity, and the output shaft of the motor (71) is in transmission connection with the bidirectional screw rod (74) through the avoiding hole.

9. A lumbar adjustment mechanism according to claim 8, wherein: Further comprising a shell (22) fixed on the back plate (21), and the shell (22) covers the first mounting base (23) and the second mounting base (24).

10. A chair characterized by: The lumbar support adjusting mechanism comprises the lumbar support adjusting mechanism according to any one of claims 1-9.

Images