CN216797052U

CN216797052U - Bolt control mechanism for furniture

Info

Publication number: CN216797052U
Application number: CN202122678935.3U
Authority: CN
Inventors: 程军; 莫伟清; 许伟
Original assignee: UE Furniture Co Ltd
Current assignee: UE Furniture Co Ltd
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2022-06-24
Anticipated expiration: 2031-11-03

Abstract

The utility model discloses a bolt control mechanism for furniture, which comprises a fixed frame, a cylindrical guide seat connected to the fixed frame, a locking piece movably arranged in the cylindrical guide seat and a control handle for controlling the movement of the locking piece, wherein the cylindrical guide seat is provided with a plurality of locking holes; the control handle comprises a rotating part which is rotationally connected with the fixed frame and a spanner which extends outwards from the rotating part; a rotating connecting block is arranged between the rotating part and the locking piece, and two ends of the rotating connecting block are respectively in rotating fit with the locking piece and the locking piece; the end of the locking piece, which is far away from the control handle, is provided with a bolt, and a return spring is arranged between the locking piece and the cylindrical guide seat; the bolt has a contraction state and an extension state, and in the extension state, the bolt extends out of the cylindrical guide seat; under the contraction state, the control handle is acted to rotate to drive the rotating connecting block to move and synchronously drive the locking piece to move along the axial direction of the cylindrical guide seat, so that the bolt is contracted in the cylindrical guide seat; and the return spring is elastically deformed to provide the elastic force for resetting the bolt to extend again.

Description

Bolt control mechanism for furniture

Technical Field

The utility model relates to the field of seats, in particular to a bolt control mechanism for furniture.

Background

In the furniture field, locking and unlocking control of a latch is often used; for example, various adjustment functions of the existing seat (such as reclining adjustment, lumbar sliding or rotating adjustment, seat back lifting adjustment, etc.) are controlled by an adjustment mechanism disposed inside the seat; the locking control mode of most of the adjusting mechanisms adopts a mode of controlling the plugging and unplugging of a plug pin for locking and unlocking; the mode of control bolt plug in current seat is roughly two kinds: one is that: the plugging and unplugging action of the plug pin is controlled by adopting a thread rotating mode, although the structure is stable, the adjustment is accurate; but users often spend a great deal of effort controlling the rotation of the latch during adjustment. The other is as follows: an operating rod directly extends and is arranged on the plug pin, and the operating rod is directly pulled and acted on the operating rod to control the plugging and unplugging actions of the plug pin, but the control mode leads the height of the operating rod to be only the same as that of the plug pin, the operating rod is often arranged at the lower end of a chair seat or the upper end of a chair back and other places which are inconvenient to be directly operated by hands, and a user cannot sit on the chair to directly control the operation and is inconvenient to use; moreover, when the inserting movement of the bolt is controlled, the bolt is easy to deviate and the operation is unstable.

In view of the above problems, it is desirable to design a latch control mechanism for furniture, which has a simple structure and is convenient and stable to control.

Disclosure of Invention

The utility model overcomes the defects in the prior art and aims to provide the bolt control mechanism for the furniture, which has skillful structure and convenient adjustment and operation; the locking piece is movably arranged in the cylindrical guide seat so as to stably limit the plugging and unplugging direction of the plug pin and avoid deviation; the control handle comprises a rotating part and a wrench extending outwards, and the locking piece can be indirectly controlled to move by directly pulling the wrench, so that the extension or contraction of the bolt is controlled, and the operation is very convenient; and through set up between rotation portion and locking piece and rotate the connecting block in order to realize the linkage between rotation portion and the locking piece for the mechanism motion is more stable.

The technical scheme of the utility model is realized as follows:

a bolt control mechanism for furniture comprises a fixed frame, a cylindrical guide seat connected to the fixed frame, a locking piece movably arranged in the cylindrical guide seat and a control handle for controlling the movement of the locking piece; the control handle comprises a rotating part and a wrench extending outwards from the rotating part, and the rotating part is rotatably connected to the fixed frame; a rotating connecting block is arranged between the rotating part and the locking piece, and two ends of the rotating connecting block are respectively in rotating fit with the locking piece and the locking piece; the end of the locking piece, which is far away from the control handle, is provided with a bolt, and a return spring is also arranged between the locking piece and the cylindrical guide seat; the bolt has a contraction state and an extension state, and in the extension state, the bolt extends out of the cylindrical guide seat; under the contraction state, the control handle is acted to rotate to drive the rotating connecting block to move and synchronously drive the locking piece to move along the axial direction of the cylindrical guide seat, so that the bolt is contracted in the cylindrical guide seat; and the return spring is elastically deformed to provide the elastic force for the bolt to return to the extended position again.

Preferably, a through movable groove is arranged in the cylindrical guide seat along the axial direction, the locking piece is arranged in the movable groove in a penetrating manner, and a sliding part in sliding fit with the movable groove is correspondingly arranged on the locking piece. Thereby make the locking piece can stably remove relative cylindric guide holder, can not rock.

Preferably, the return spring is a compression spring; an annular contraction part extending towards the center direction is arranged at an opening of one end, far away from the bolt, of the cylindrical guide seat, the reset spring is sleeved on the locking piece, and the reset spring is limited between the sliding part and the contraction part. The return spring is hidden in the cylindrical guide seat, and the structure is simple and attractive.

Preferably, the movable groove is a cylindrical groove, and correspondingly, the sliding part is cylindrical. So that the locking piece can slide smoothly in the cylindrical guide seat.

Preferably, a limiting mechanism is further arranged between the rotating part and the fixing frame, and the limiting mechanism comprises an arc-shaped limiting groove arranged on one of the rotating part and the fixing frame and a limiting column correspondingly arranged on the other of the rotating part and the fixing frame. The rotation angle of the rotating part is effectively limited.

Preferably, the locking member has a mounting block exposed from the cylindrical guide seat near the end of the control handle, the mounting block being configured to be rotatably coupled to the connecting block.

Preferably, the two ends of the rotary connecting block are respectively provided with an axle column, one of the axle columns is rotatably arranged on the mounting block in a penetrating manner, and the other axle column is rotatably arranged on the rotating part in a penetrating manner.

Preferably, during the rotation of the rotating part, the rotating connecting blocks move synchronously and deflect correspondingly. If the rotating part is directly connected with the locking piece, the stress is poor and the structure is easy to damage; through setting up the rotation connecting block, rotate connecting block self and deflect and can adjust the atress direction for the horizontal sideslip of drive locking piece that the portion of rotating can be smooth and easy.

Preferably, the wrench extends downwards from the rotating part and is exposed out of the fixed frame, and the wrench is pulled to drive the rotating part to rotate left and right relative to the fixed frame. The wrench extends and is exposed at one side of the fixing frame and can be arranged at a position which is convenient for a user to operate; and the force arm is lengthened, so that the operation is more labor-saving.

Preferably, the cylindrical guide seat is detachably connected to the fixed frame by screws. The connection is convenient, and the cylindrical guide seat can be independently subjected to die sinking processing.

The design starting point, concept and beneficial effect of the utility model adopting the technical scheme are as follows:

firstly, the bolt control mechanism for furniture of the utility model is characterized in that the locking piece is movably arranged in the cylindrical guide seat, and the locking piece is provided with a sliding part which is in sliding fit with the movable groove in the cylindrical guide seat; therefore, the locking piece can stably move relative to the cylindrical guide seat, the plugging direction of the plug pin can be stably limited, and deviation is avoided; the control handle comprises a rotating part and a wrench extending outwards, the wrench extends downwards from the rotating part and is exposed out of the fixed frame, and the wrench is arranged at a position convenient for a user to operate; and the force arm is lengthened, so that the operation is more labor-saving.

Secondly, through set up the linkage of rotation connecting block in order to realize between rotation portion and the locking piece, and rotate the connecting block and be normal running fit with locking piece and rotation portion respectively. Because the rotating track of the rotating part is arc-shaped and the locking piece moves linearly, if the rotating part is directly connected with the locking piece, the stress is not good, and the structure is easy to damage; through setting up the rotation connecting block, rotate connecting block self and deflect and can adjust the atress direction for the horizontal sideslip of drive locking piece that the rotation portion can be smooth and easy, the labour saving operation.

And moreover, a pressure spring for resetting the bolt is arranged between the locking piece and the cylindrical guide seat, and the pressure spring is hidden in the cylindrical guide seat, so that the structure is simple and attractive.

Drawings

Figure 1 is a schematic perspective view of a lumbar support body in an initial position in an embodiment of the present invention;

figure 2 is a schematic perspective view of the lumbar support body in an ejected position in an embodiment of the present invention;

FIG. 3 is a schematic perspective view of the connection between the lumbar support body and the fixing frame according to the embodiment of the present invention;

figure 4 is an exploded view of the lumbar support body and the attachment bracket in an embodiment of the present invention;

FIG. 5 is a schematic perspective view of a support member coupled to a lumbar support body in an embodiment of the present invention;

FIG. 6 is a schematic perspective view of the back side of a support member according to an embodiment of the present invention;

FIG. 7 is a schematic perspective view of the front side of a support member according to an embodiment of the present invention;

FIG. 8 is a schematic perspective view of the latch control mechanism engaged with the engaging portion according to an embodiment of the present invention;

FIG. 9 is a schematic perspective view of the embodiment of the present invention in which the mating portion is located at the bottom of the slider;

FIG. 10 is a view showing a connection structure of the latch control mechanism according to the embodiment of the present invention;

FIG. 11 is a cross-sectional view of a latch control mechanism in an embodiment of the present invention;

FIG. 12 is a perspective view of an embodiment of the utility model with the latch extended;

fig. 13 is a perspective view of the latch in a retracted state according to an embodiment of the present invention.

The figures are numbered: a lumbar support body 1; a fixed mount A; a support member 3; a latch control mechanism 4; a cylindrical guide holder 5; a locking member 6; a control handle 7; a rotating portion 7 a; a wrench 7 b; a fitting portion 8; a first positioning hole 9; a second positioning hole 10; a locking pin 11; a side support section 1 a; a rotating shaft 12; a rotating base 13; an elastic portion 14; a slide bearing seat 15; a cross support section 16; a buckle 17; an elastic latch 18; a latch 19; a chute 20; a mounting hole 21; a stopper 22; the guide posts 22 a; a stopper head 22 b; an elastic member 23; rotating the connecting block 24; a pressure spring 25; a movable groove 26; a slide portion 27; a mounting block 28; the shaft posts 29; a constriction 30; a stopper groove 31; a retaining post 32.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the utility model, taken in conjunction with the accompanying drawings and detailed description, is set forth below. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

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

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

The present embodiment is described in relation to reference orientations of respective parts, such as front and rear, in a state where a user normally uses the seat after sitting on the seat.

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

as shown in fig. 1-13, the present invention provides a latch control mechanism for furniture, such as a seat, which is particularly applied in an adjustment mechanism of the seat to provide locking adjustment for various functions of the seat. In the present embodiment, the latch control mechanism is specifically disposed in a seat lumbar depth adjustment device, which is described below in detail to facilitate a clear understanding of the structure and operation of the latch control mechanism.

The seat waist leans on degree of depth adjusting device including rotating the waist of connecting on mount A and lean on body 1, waist leans on body 1 to rotate around mount A carries out. A longitudinal supporting component 3 is arranged between the waist rest body 1 and the fixing frame A, the supporting component 3 comprises a matching part 8 at the bottom and a vertical elastic part 14 with elasticity, the matching part 8 is in sliding fit with the fixing frame A, and the supporting component 3 can correspondingly slide upwards or downwards along the fixing frame A in response to the front-back rotation action of the waist rest body 1. The bolt control mechanism 4 is arranged on the fixed frame A and is positioned on one side of the supporting part 3; the bolt control mechanism 4 comprises a cylindrical guide seat 5 connected to the fixing frame A, a locking piece 6 arranged in the cylindrical guide seat 5, and a control handle 7 capable of controlling the movement of the locking piece 6; wherein the control handle 7 is rotationally connected on the fixing frame A, and the action control handle 7 rotates to drive the locking piece 6 to transversely move along the axial direction of the cylindrical guide seat 5. In addition, two positioning holes spaced up and down are provided on the fitting portion 8 at the bottom of the support member 3, and the positioning holes include a first positioning hole 9 located above and a second positioning hole 10 located below; the end part of the locking piece 6 is correspondingly provided with a bolt 11 which can penetrate out of the cylindrical guide seat 5 to be in splicing fit with the positioning hole, and the bolt 11 is inserted into the first positioning hole 9 or the second positioning hole 10 to play a role of locking the matching part 8, so that the initial position of the lumbar support body 1 can be adjusted in advance before the lumbar support is used. Specifically, the method comprises the following steps: when the bolt 11 is separated from the positioning hole, the lumbar support body 1 can rotate back and forth and drive the supporting part 3 to move up and down so as to adjust the initial position of the lumbar support body 1; and the lumbar support body 1 is fixed at different initial positions by inserting the control bolt 11 into the first positioning hole 9 or the second positioning hole 10. In addition, under the effect of elastic component 14, when waist leans on body 1 to be in different initial position and receive backward effort, make elastic component 14 produce deformation in order to carry out elastic support to waist leans on body 1, then can take place the self-adaptation elasticity deflection of certain degree, use more comfortablely.

Further, as shown in fig. 1-5, the lumbar support body 1 is shaped like a Chinese character 'kou', the lumbar support body 1 includes side support sections 1a at two sides, and a rotating shaft 12 horizontally extending toward the center of the lumbar support body 1 is disposed at the lower part of the side support sections 1 a; the two sides of the fixing frame A are correspondingly provided with rotating seats 13, and the rotating shaft 12 is rotatably connected on the rotating seats 13 so that the lumbar support body 1 can rotate around the fixing frame A in the front and back directions. The key points are as follows: as shown in fig. 1 and 2, the rotating shaft 12 is disposed at the lower portion of the lumbar support body 1, so that the lumbar support body 1 rotates eccentrically around the fixing frame a, and the lumbar support body 1 rotates backwards to apply a downward oblique force to the supporting member 3, thereby effectively acting on the supporting member 3 to slide up and down. Then make the rotation range on waist by body 1 upper portion bigger, just collateral branch support section 1a be the forward convex arc body in upper portion to make the waist by the body 1 rotation in-process, the main control be its bulge ejecting or shrink, make the waist by the top waist adjusting effect of body 1 very obvious, the feedback is timely.

As shown in fig. 3-6, the elastic portion 14 is a supporting elastic sheet extending upwards from the matching portion 8, and the supporting elastic sheet is an arc-shaped body with a middle position protruding forwards, so that when the lumbar support body 1 rotates backwards and presses the supporting elastic sheet, the supporting elastic sheet deforms to a certain extent in the vertical direction to make the matching portion 8 have a tendency of moving downwards. And the upper end joint of elastic component 14 is in the upper end of waist by body 1, specifically: the lumbar support body 1 further comprises transverse support sections 16 positioned at the upper end and the lower end, wherein a bayonet 17 is arranged at the middle position of the transverse support section 16 at the upper part, and an elastic clamping tongue 18 and a clamping block 19 positioned below the elastic clamping tongue 18 are correspondingly arranged at the upper end of the elastic part 14; when in connection, the upper end of the elastic part 14 passes through the bayonet 17 to enable the elastic clamping tongue 18 to be clamped out of the bayonet 17, and the transverse supporting section 16 is limited between the elastic clamping tongue 18 and the clamping block 19, so that the upper end of the elastic part 14 and the lumbar support body 1 are relatively fixed in the vertical direction; the elastic part 14 has elasticity, so that the waist rest body 1 can elastically deflect to achieve a self-adaptive function in a use state, and is more comfortable. The structure of joint is adopted, connects convenient and fast, and the atress is dispersed relatively, if adopt screwed connection, the atress concentrates on a bit, leads to the material fracture easily.

Furthermore, a longitudinal sliding support seat 15 is arranged at the middle position of the fixing frame A, and the matching part 8 at the lower end of the supporting component 3 is in sliding fit in the sliding support seat 15; as shown in fig. 6, the sliding fit manner of the matching portion 8 and the sliding support seat 15 adopts a surface contact sliding fit, the back surface of the matching portion 8 is arc-shaped, the sliding contact surfaces of the sliding support seat 15 and the matching portion 8 are correspondingly arranged into arc-shaped surfaces, and the arc-shaped surfaces are bent towards the front upper side from bottom to top; therefore, when the supporting part 3 moves upwards along the sliding supporting seat 15, the lumbar support body 1 can move forwards at the same time, so that the lumbar support body 1 can be driven to rotate forwards and eject; the matching part 8 slides vertically along the sliding support seat 15 to correspond to the front and back rotation action of the lumbar support body 1, and the sliding support seat 15 can be longitudinally arranged on the fixing frame A, so that the fixing frame A is reasonable in space distribution and is lighter and thinner in front and back; if the supporting part 3 is arranged to move forward and backward, a moving space in the front-back direction needs to be reserved on the fixing frame A, so that the fixing frame A is thicker and heavier, and the internal structure of the fixing frame A is too compact and complicated. As shown in fig. 6-8, a sliding slot 20 is provided on the engaging portion 8 along the longitudinal direction, a mounting hole 21 is provided on the slide support 15, the engaging portion 8 is slidably mounted on the slide support 15 through a limiting member 22, the limiting member 22 has a limiting head 22b and a guiding post 22a extending from the limiting head 22b, the guiding post 22a passes through the sliding slot 20 and is connected in the mounting hole 21, and the width of the limiting head 22b is greater than the width of the sliding slot 20, so as to limit the engaging portion 8 from separating from the slide support 15. Through this connection structure, the stopper 22 can restrict the engaging portion 8 from leaving the slide bearing 15 without interfering with the sliding of the engaging portion 8, and can restrict the engaging portion 8 from shifting in the left-right direction. In addition, as shown in fig. 3 and 8, an elastic element 23 is further disposed between the lower end of the engaging portion 8 and the sliding support 15, the elastic element 23 is a longitudinally disposed spring, and the elastic element 23 is configured to provide an elastic force to make the support component 3 always have a tendency to slide upwards, so that the lumbar support body 1 always has a tendency to rotate forwards and push out, and thus the lumbar support body 1 can push out forwards by itself during adjustment.

As shown in fig. 3-13, the latch control mechanism 4 can effectively lock the matching part 8, so as to lock the lumbar support body 1; specifically, the method comprises the following steps: the cylindrical guide seat 5 is arranged at a position close to the matching part 8, and the cylindrical guide seat 5 is detachably connected to the fixing frame A through a screw, so that the connection is convenient, and the cylindrical guide seat 5 can be independently subjected to die sinking processing; the two ends of the cylindrical guide seat 5 are open and the interior of the cylindrical guide seat is communicated; a movable groove 26 penetrating along the axial direction is arranged in the cylindrical guide seat 5, and the locking piece 6 transversely penetrates in the movable groove 26; the movable groove 26 is a cylindrical groove, and the locking member 6 is correspondingly provided with a cylindrical sliding part 27 which protrudes along the circumferential direction and is in sliding fit with the movable groove 26, so that the locking member 6 can stably move transversely relative to the cylindrical guide seat 5, and the locking member 6 is prevented from shaking in the cylindrical guide seat 5. And the locking piece 6 is provided with the bolt 11 towards the positioning hole end. The control handle 7 comprises a rotating part 7a positioned above and a wrench 7b extending downwards and exposed out of one side of the fixed frame A; wherein, the rotating part 7b is rotatably connected on the fixing frame A, and the rotating part 7b can rotate left and right relative to the fixing frame A. As shown in fig. 10-13, the rotating part 7a and the locking member 6 are linked through a rotating connecting block 24, and a mounting block 28 exposed outside the cylindrical guide seat 5 is arranged at one end of the locking member 6 close to the control handle 7; the both ends of rotating connecting block 24 rotate with rotation portion 7a and installation piece 28 respectively and are connected, specifically mean: two ends of the rotary connecting block 24 are respectively provided with an axle column 29, wherein one axle column 29 is rotatably arranged on the mounting block 28 in a penetrating way, and the other axle column 29 is rotatably arranged on the rotating part 7a in a penetrating way; and are respectively connected to two shaft seats 29 by means of limiting screws, so as to limit the rotation of connecting block 24 from disengaging mounting block 28 and rotating portion 7 a. As shown in fig. 12-13: the rotating part 7a rotates left and right to drive the rotating connecting block 24 to move transversely so as to drive the locking piece 6 to move horizontally transversely, so that the bolt 11 has an extending and contracting state and an extending state; as shown in fig. 12: under the extending state, the bolt 11 extends out of the cylindrical guide seat 5, and the bolt 11 is inserted in the positioning hole; as shown in fig. 13: in the contraction state, the control handle 7 is acted on to rotate to drive the locking piece 6 to move transversely, so that the bolt 11 is withdrawn from the positioning hole and contracted in the cylindrical guide seat 5. And the wrench 7b extends downwards and is exposed out of the fixing frame A, so that a user can conveniently sit on the chair to adjust the chair without leaving the chair, and the operation is quick and convenient. Further, the method comprises the following steps: during the rotation of the rotating part 7a, the rotating connecting block 24 moves synchronously and deflects correspondingly; because the rotating track of the rotating part 7a is arc-shaped, and the locking piece 6 moves linearly, if the rotating part 7a is directly connected with the locking piece 6, the stress is poor, and the structure is easy to damage; through setting up rotation connecting block 24, rotate connecting block 24 self and deflect and can adjust the atress direction for 6 horizontal sideslip of drive locking piece that rotation portion 7a can be smooth and easy, it is more laborsaving to operate.

As shown in fig. 10-11, the locking member 6 is located in the cylindrical guide seat 5, and a return spring is further disposed between the locking member 6 and the cylindrical guide seat 5, and the return spring is a compression spring 25. Wherein, an annular contraction part 30 extending towards the center direction is arranged at the opening of one end of the cylindrical guide seat 5 far away from the bolt 11; the pressure spring 25 is sleeved on the locking piece 6, and the pressure spring 25 is limited between the sliding part 27 and the contraction part 30, so that the pressure spring 25 is hidden in the cylindrical guide seat 5, and the structure is simple and attractive. When the bolt 11 is in a contraction state, the pressure spring 25 is in a compression state; the compression spring 25 can provide elasticity to enable the bolt 11 to always have a tendency of penetrating out of the cylindrical guide seat 5 and being inserted into the first positioning hole 9 or the second positioning hole 10, so that the bolt 11 can be automatically locked by loosening the control handle 7. A limiting mechanism is arranged between the rotating part 7a and the fixing frame A, and comprises an arc-shaped limiting groove 31 arranged on the rotating part 7a and a limiting column 32 correspondingly arranged on the fixing frame A and protruding in the limiting groove 31; so that the rotation angle of the rotating portion 7a can be restricted.

As shown in fig. 6 to 13, the first positioning hole 9 and the second positioning hole 10 are disposed on the side wall of the fitting portion 8 near the cylindrical guide holder 5; and the positional relationship of the first positioning hole 9 and the second positioning hole 10 is configured as follows: when the support member 3 is at the lowest position of the slide bearing 15 as shown in fig. 9, the first positioning hole 9 is just aligned with the insertion hole of the insertion pin 11, and the insertion pin 11 is inserted into the first positioning hole 9, as shown in fig. 1, and in this position, the lumbar support body 1 is at the backward position (i.e., the normal use state). If the waist rest body 1 needs to achieve the waist supporting effect, the wrench 7b is wrenched to rotate the rotating part 7a, so as to drive the locking piece 6 to be far away from the matching part 8, and the bolt 11 is withdrawn from the first positioning hole 9; as shown in fig. 2 and 8, the supporting component 3 will move up along the sliding support seat 15 under the action of the elastic element 23 and simultaneously drive the lumbar support body 1 to rotate forward and eject, when the supporting component 3 moves up to the maximum position, the second positioning hole 10 is just aligned with the bolt 11, and only by loosening the wrench 7b, the bolt 11 will be inserted into the second positioning hole 10 under the action of the elastic force of the pressure spring 25, so as to lock the lumbar support body 1 again, and at this time, the lumbar support body 1 is in the ejected position. If the lumbar support body 1 needs to be reset, the wrench 7b is pulled again to push the lumbar support body 1 to rotate backwards for resetting, and then the wrench 7b is loosened again; if a user sits on the seat, the user can directly lean backwards to act on the waist rest body 1, and the operation is very quick and convenient.

To sum up, the waist support depth adjusting device can pre-adjust the initial position of the waist support body 1 before the user uses the waist support. When the waist support body 1 is required to be used and has the waist supporting effect, only the control handle 7 is needed to be acted, the waist support body 1 can automatically rotate forwards to be ejected, and then the control handle 7 is loosened to lock the waist support body 1 at the ejection position. If only need the waist to lean on body 1 and play when ordinary support effect, effect control handle 7 and promote waist to lean on body 1 and rotate backward, then with waist lean on body 1 locking in the position of moving back can, the operation is adjusted lightly laborsavingly.

Through the bolt control mechanism for furniture, the locking piece 6 is limited to move in the cylindrical guide seat 5, so that the stable plugging and unplugging direction of the bolt 11 is ensured, and the bolt cannot deviate; when in operation, the bolt 11 can be effectively controlled to stretch only by directly acting on the wrench 7b, and the wrench 7b extends downwards and is exposed out of the fixing frame A and can be arranged at a position which is convenient for a user to operate; and the length of the wrench 7b is long enough, so that the force arm is longer during adjustment, and labor is saved during operation.

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

Claims

1. A bolt control mechanism for furniture, characterized in that: the device comprises a fixed frame, a cylindrical guide seat connected to the fixed frame, a locking piece movably arranged in the cylindrical guide seat and a control handle for controlling the movement of the locking piece; the control handle comprises a rotating part and a wrench extending outwards from the rotating part, and the rotating part is rotatably connected to the fixed frame; a rotating connecting block is arranged between the rotating part and the locking piece, and two ends of the rotating connecting block are respectively in rotating fit with the locking piece and the locking piece; the end of the locking piece, which is far away from the control handle, is provided with a bolt, and a return spring is also arranged between the locking piece and the cylindrical guide seat; the bolt has a contraction state and an extension state, and in the extension state, the bolt extends out of the cylindrical guide seat; under the contraction state, the control handle is acted to rotate to drive the rotating connecting block to move and synchronously drive the locking piece to move along the axial direction of the cylindrical guide seat, so that the bolt is contracted in the cylindrical guide seat; and the return spring is elastically deformed to provide the elastic force for the bolt to return to the extended position again.

2. The latch control mechanism for furniture according to claim 1, wherein: the cylindrical guide seat is internally provided with a through movable groove along the axial direction, the locking piece is arranged in the movable groove in a penetrating way, and the locking piece is correspondingly provided with a sliding part in sliding fit with the movable groove.

3. The latch control mechanism for furniture according to claim 2, wherein: the reset spring is a pressure spring; an annular contraction part extending towards the center direction is arranged at an opening of one end, far away from the bolt, of the cylindrical guide seat, the reset spring is sleeved on the locking piece, and the reset spring is limited between the sliding part and the contraction part.

4. The latch control mechanism for furniture according to claim 2, wherein: the movable groove is a cylindrical groove, and correspondingly, the sliding part is cylindrical.

5. The latch control mechanism for furniture according to claim 1, wherein: and a limiting mechanism is also arranged between the rotating part and the fixing frame and comprises an arc-shaped limiting groove arranged on one of the rotating part or the fixing frame and a limiting column correspondingly arranged on the other of the rotating part or the fixing frame.

6. The latch control mechanism for furniture according to claim 1, wherein: the locking piece is provided with a mounting block which is exposed outside the cylindrical guide seat and close to the end of the control handle, and the mounting block is configured to be rotatably connected with the connecting block.

7. The latch control mechanism for furniture according to claim 6, wherein: the two ends of the rotary connecting block are respectively provided with an axle post, one of the axle posts is rotatably arranged on the mounting block in a penetrating mode, and the other axle post is rotatably arranged on the rotating portion in a penetrating mode.

8. The latch control mechanism for furniture according to claim 1, wherein: during the rotation process of the rotating part, the rotating connecting blocks move synchronously and deflect correspondingly.

9. The latch control mechanism for furniture according to claim 1, wherein: the wrench extends downwards from the rotating part and is exposed out of the fixed frame, and the wrench is pulled to drive the rotating part to rotate left and right relative to the fixed frame.

10. The latch control mechanism for furniture according to claim 1, wherein: the cylindrical guide seat is detachably connected to the fixed frame through screws.