Tilting and pitching locking mechanism and chassis

Abstract

The utility model provides a tipping locking mechanism and a chassis. The tipping locking mechanism comprises a base, a tipping piece, an extension plate, a first locking piece, a second locking piece and a control piece, the tipping piece is rotationally arranged on the base, the extension plate is arranged on the tipping piece, the first locking piece, the second locking piece and the control piece are arranged on the base in a sliding mode, the first locking piece and the second locking piece move under the control of the control piece, and the tipping piece has a movable state and a locked state; in the movable state, the control piece slides on the base to drive the first locking piece to leave the first locking hole, the second locking piece to leave the second locking hole, and the tipping piece can rotate on the base. In the locking state, the control piece slides on the base to drive the first locking piece to enter the first locking hole or the second locking piece to enter the second locking hole, and the tipping piece and the base are kept relatively static. Compared with the prior art, the scheme can have more gears so as to provide more choices for users.

Description

Technical Field

[0001] The utility model relates to the field of furniture, in particular to a tilt locking mechanism and a chassis. Background Art

[0002] With the improvement of people's living standards and office conditions, the demand for office chairs is increasing, and the corresponding requirements are also getting higher and higher. In modern office chairs, the chassis is one of the indispensable and important components. The chassis generally integrates multiple functions, such as gas rod lifting, chair back tilt adjustment, etc.; however, many chassis only support the locking and unlocking of the chair back rotation. After unlocking, the chair back can be rotated but cannot be maintained at the current angle, and it can only be locked when the chair back is in a roughly vertical position. If the user wants to rest, read or play with the mobile phone on the office chair, he can only be in a completely reclining state. The arms are difficult to get support from the armrests, which makes it easy to get fatigue.

[0003] There is an office chair chassis that only has the functions of gas rod lifting and chair back tilt adjustment. It has a simple structure and maintains a lower price, making it very suitable for low-priced chairs, such as the chassis disclosed in U.S. Patents US07518378 and US10684157. In this chassis, the backrest is locked in tilt by pressing the friction plate. When the friction plate is released, the backrest can rotate relative to the chassis. When the friction plate is locked, the backrest can remain stationary relative to the chassis. Although the friction plate locking method can simply and cost-effectively lock the chair back in any tilt position, this method is more laborious to operate, and the user needs to expend greater effort when unlocking and bending the operating lever. Moreover, it will wear out over time, causing the friction plate to produce noise when moving, and even causing the locking to fail.

[0004] The problem of friction locking can be solved by replacing it with a structural locking method. There is currently a chassis that realizes the reclining locking of the seat back by setting a structural locking method with multiple gears. It mainly includes an insert and a gear seat. The gear seat is vertically arranged in a block shape in the chassis and has multiple gear slots on the gear seat. All gear slots are arranged from the upper right to the bottom. The insert is moved into the gear slot by controlling the operating lever to achieve locking, such as Chinese patent CN201920265455.4. Although this method solves the problem caused by friction locking, it also has the following problems:

[0005] The most important thing is that since the gear slots are arranged in intervals up and down, when switching states, the insert must completely cross the interval distance between the gear slots to be locked again. This means that the chair back can have a small number of gears within a limited rotation angle. Excluding the initial gear, there are generally only 2 gears, and users have too few choices.

[0006] In addition, due to processing reasons, the thickness of the insert and the size of the gear slot are difficult to match, so when locking, the gap between the two is difficult to control. When the gap is too large, even if the chair back is locked, it is easy to shake. Summary of the Invention

[0007] In order to solve the above-mentioned technical problems, the utility model provides a tilt locking mechanism, including a base, a tilt member, an extension plate, a first and a second locking member and a control member; the tilt member is rotatably arranged on the base, the extension plate is arranged on the tilt member, the first and the second locking members and the control member are all slidably arranged on the base, under the control of the control member, the first and the second locking members move, and the tilt member has a movable state and a locked state; in the movable state, the control member slides on the base to drive the first locking member to leave the first locking hole and the second locking member to leave the second locking hole, and the tilt member can rotate on the base; in the locked state, the control member slides on the base to drive the first locking member to enter the first locking hole or the second locking member to enter the second locking hole, and the tilt member and the base remain relatively stationary.

[0008] Furthermore, a chassis is provided, which includes the above-mentioned tilt locking mechanism.

[0009] The technical solution of the present utility model is achieved as follows:

[0010] A tilt locking mechanism, comprising:

[0011] a base configured as a main support for the mechanism;

[0012] A tilting member, rotatably arranged on the base;

[0013] An extension plate is vertically disposed on the tilting member, and is provided with a first locking portion and a second locking portion, wherein the first locking portion is located beside the second locking portion, the first locking portion includes a plurality of vertically arranged first locking holes, and the second locking portion includes a plurality of vertically arranged second locking holes; and the first locking holes and the second locking holes are staggered in the vertical direction;

[0014] The first locking member and the second locking member are both slidably disposed on the base, the axes of the first locking member and the second locking member are both arranged horizontally and located beside the extension plate; the first locking member is located beside the second locking member and the axes of the two are parallel;

[0015] a control member, slidably disposed on the base, the control member being configured to drive the first locking member and the second locking member to slide on the base when the control member slides;

[0016] The first locking piece is located beside the first locking portion, and the second locking piece is located beside the second locking portion; the tilting piece has a movable state and a locked state; in the movable state, the control piece slides on the base to drive the first locking piece to leave the first locking hole and the second locking piece to leave the second locking hole, and the tilting piece can rotate on the base; in the locked state, the control piece slides on the base to drive the first locking piece to enter the first locking hole or the second locking piece to enter the second locking hole, and the tilting piece and the base remain relatively stationary.

[0017] In this solution, the effect of maximizing the number of gears is achieved by staggering two groups of locking holes; the two groups of locking holes are respectively matched with two locking pieces. When locking, only a single locking piece is plugged into one of the locking holes in the corresponding group of locking holes, and the other locking piece will stay outside the locking hole. When it is in a movable state and rotates again, it is only necessary to rotate half the distance between the two locking holes in the same group to align the other locking piece with the locking holes in the group. Compared with the existing technology, the distance between each gear is smaller, and the required rotation angle of the chair back is smaller when switching gears. Therefore, under the same chair back rotation stroke, this solution can have more gears to provide users with more choices; the height of the gear is compressed, and the difference between each gear is small, which is conducive to users adjusting and finding a comfortable position.

[0018] If locking parts and corresponding locking holes are added according to this solution, the effect can be further improved and more gears can be added.

[0019] Preferably, it also includes an elastic drive member, which is rotatably mounted on the base and one end of the elastic drive member is mounted on the control member, while the other end of the elastic drive member is mounted on the first locking member and the second locking member; the elastic drive member is configured to drive the first locking member and the second locking member to move when the control member slides. The elastic drive member is mainly used to link the control member with the two locking members, so that the control member can drive the locking members to move when the control member moves; since the elastic drive member is elastic and can be elastically deformed, even when the first locking member and the second locking member cannot move, the elastic drive member can still be deformed with the movement of the control member, so that the first locking member and the second locking member can alternately enter their corresponding locking holes and the overall movement can still proceed smoothly without conflict, that is, when the first locking member enters the first locking hole, the second locking member abuts against the second locking portion under the action of the elastic drive member. On the contrary, when the second locking member enters the second locking hole, the first locking member abuts against the first locking portion under the action of the elastic driving member; in addition, the elasticity also makes the elastic driving member have a delayed driving effect, that is, in the movable state, after the control member moves, the first locking member and the second locking member are unable to move because neither the first locking member nor the second locking member has yet to align with their corresponding locking holes. At this time, the elastic driving member is deformed due to the movement of the control member. When the chair back is rotated so that any locking member is aligned with any locking hole, the elastic force of the elastic driving member will drive the locking member into the aligned locking hole to switch to the locked state.

[0020] Preferably, the elastic drive member includes a first torsion spring and a second torsion spring; both the first torsion spring and the second torsion spring are rotatably mounted on the base, the first torsion spring being configured to connect the control member to the first locking member, and the second torsion spring being configured to connect the control member to the second locking member. In the left-right direction, the first torsion spring is positioned to the side of the second torsion spring, and the first locking member and the second locking member are spaced apart from each other in the front-to-back direction, such that the first torsion spring and the second torsion spring are also staggered in the front-to-back direction; the waist holes corresponding to the torsion springs, the insertion holes on the locking member, and the like are also staggered in the front-to-back and left-to-right directions.

[0021] Preferably, the first torsion spring and the second torsion spring each have two torsion spring arms, the torsion spring arm close to the control member has an upwardly extending connecting portion, and the torsion spring arm close to the first locking member and the second locking member has a limiting portion; two connecting holes are provided on the control member, and the two connecting portions are respectively inserted into the two connecting holes; the first locking member and the second locking member each have an insertion hole, and the two limiting portions are respectively inserted into the two insertion holes.

[0022] Preferably, the base is provided with two waist holes, one located above the first locking member and the other above the second locking member; two limiting portions protrude upward from the first locking member and the second locking member and enter the corresponding waist holes. The limiting portions cooperate with the waist holes on the base to limit the movement of the locking members.

[0023] Preferably, the insertion hole of the first locking member is located in the middle of the first locking member, and the insertion hole of the second locking member is located at the end of the second locking member near the extension plate. When two torsion springs of the same specifications are used, the relative positions of the two connecting holes correspond to the relative positions of the two insertion holes, that is, the two connecting holes are located one in front of the other and spaced left and right.

[0024] Preferably, the first and second locking members are both circular pins; and the first and second locking holes are both elliptical. Using a pin and an elliptical locking hole allows for better control of the gap between the two, thereby minimizing wobble during locking. Furthermore, the structure is simpler, requiring fewer parts, requiring less modification, and making fabrication easier. The pin also ensures sufficient support strength to prevent damage.

[0025] Preferably, the first locking member and the second locking member are perpendicular to the extension plate.

[0026] A chassis comprises the tilt locking mechanism described above.

[0027] Preferably, it also includes a fixed seat and a backrest connecting member, the base is rotatably arranged on the fixed seat, a first rotating shaft is provided between the base and the fixed seat, and the axis of the first rotating shaft is arranged along the front-to-back direction; a second rotating shaft is provided between the tilting member and the base, and the axis of the second rotating shaft is arranged along the left-right direction; the backrest connecting member is rotatably connected to the base, a third rotating shaft is provided between the backrest connecting member and the base, and the axis of the third rotating shaft is arranged along the left-right direction; the backrest connecting member and the tilting member are linked, a sliding rotating groove is provided on the backrest connecting member, and a fourth rotating shaft is provided on the tilting member, and the fourth rotating shaft is inserted in the sliding rotating groove. In this solution, the fixed seat is used to connect the chair's lifting gas rod and chair legs, the backrest connector is used to connect the chair back, and the reclining member can be used to connect the seat, so that the chair back and the seat are linked, and when the chair back tilts backward, the seat also rotates together; since the reclining member is linked with the backrest connector, the locking of the locking member and the locking hole acts on the reclining movement of the seat and the backrest at the same time, and can have more gear options; in addition, when there is no linkage between the seat and the backrest, the backrest connector can also directly serve as a reclining member.

[0028] The design starting point, concept and beneficial effects of the utility model using the above technical solution are:

[0029] In this solution, the effect of maximizing the number of gears is achieved by staggering two groups of locking holes; the two groups of locking holes are respectively matched with two locking pieces. When locking, only a single locking piece is plugged into one of the locking holes in the corresponding group of locking holes, and the other locking piece will stay outside the locking hole. When it is in a movable state and rotates again, it is only necessary to rotate half the distance between the two locking holes in the same group to align the other locking piece with the locking holes in the group. Compared with the existing technology, the distance between each gear is smaller, and the required rotation angle of the chair back is smaller when switching gears. Therefore, under the same chair back rotation stroke, this solution can have more gears to provide users with more choices; the height of the gear is compressed, and the difference between each gear is small, which is conducive to users adjusting and finding a comfortable position. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the three-dimensional structure of the chassis in the embodiment of the utility model Figure 1 ;

[0031] Figure 2 This is a schematic diagram of the three-dimensional structure of the chassis in the embodiment of the utility model Figure 2 ;

[0032] Figure 3 This is a cross-sectional view of the chassis in an embodiment of the present utility model;

[0033] Figure 4 This is a schematic diagram of the three-dimensional structure of the first locking member plugged into the first locking hole in the embodiment of the present invention;

[0034] Figure 5 This is a bottom view of the first locking member plugged into the first locking hole in the embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the three-dimensional structure of the second locking member plugged into the second locking hole in the embodiment of the present invention;

[0036] Figure 7 This is a bottom view of the second locking member being plugged into the second locking hole in the embodiment of the present invention;

[0037] Figure 8 This is a schematic diagram of the chassis gear shifting in an embodiment of the present invention;

[0038] Figure 9 This is a schematic diagram of a three-dimensional structure in which the base is arranged on the fixing base in an embodiment of the present invention;

[0039] Figure 10 This is a schematic diagram of the connection between the first torsion spring, the second torsion spring and the control member in an embodiment of the present invention.

[0040] The figures are marked as follows: base 1; tilt member 2; extension plate 3; first locking portion 31; second locking portion 32; first locking hole 4; second locking hole 5; first locking member 6; second locking member 7; control member 8; operating rod 81; operating block 82; fixed seat 9; chair back connector 10; first rotating shaft 11; second rotating shaft 12; third rotating shaft 13; fourth rotating shaft 14; sliding rotation groove 15; spring 16; connecting plate 17; first torsion spring 18; second torsion spring 19; connecting portion 20; limiting portion 21; connecting hole 22; insertion hole 23; waist hole 24. DETAILED DESCRIPTION

[0041] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0042] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0043] In the description of the present invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0044] The specific implementation of the utility model is as follows:

[0045] like Figure 3-9 As shown, the utility model provides a tilt locking mechanism, comprising:

[0046] Base 1, configured as the main support of the mechanism;

[0047] The tilting member 2 is rotatably mounted on the base 1;

[0048] An extension plate 3 is vertically mounted on the reclining member 2 and is provided with a first locking portion 31 and a second locking portion 32. The first locking portion 31 is located adjacent to the second locking portion 32. The first locking portion 31 includes a plurality of vertically arranged first locking holes 4, and the second locking portion 32 includes a plurality of vertically arranged second locking holes 5. The first locking holes 4 and the second locking holes 5 are staggered in the vertical direction.

[0049] The first locking member 6 and the second locking member 7 are both slidably disposed on the base 1. The axes of the first locking member 6 and the second locking member 7 are both arranged horizontally and located beside the extension plate 3. The first locking member 6 is located beside the second locking member 7 and the axes of the two are parallel.

[0050] A control member 8 is slidably disposed on the base 1 , and the control member 8 is configured to drive the first locking member 6 and the second locking member 7 to slide on the base 1 when the control member 8 slides;

[0051] The first locking piece 6 is located beside the first locking portion 31, and the second locking piece 7 is located beside the second locking portion 32; the tilting piece 2 has a movable state and a locked state; in the movable state, the control piece 8 slides on the base 1 to drive the first locking piece 6 to leave the first locking hole 4 and the second locking piece 7 to leave the second locking hole 5, and the tilting piece 2 can rotate on the base 1; in the locked state, the control piece 8 slides on the base 1 to drive the first locking piece 6 to enter the first locking hole 4 or the second locking piece 7 to enter the second locking hole 5, and the tilting piece 2 and the base 1 remain relatively stationary.

[0052] In this solution, the effect of maximizing the number of gears is achieved by staggering two groups of locking holes; the two groups of locking holes are respectively matched with two locking pieces. When locking, only a single locking piece is plugged into one of the locking holes in the corresponding group of locking holes, and the other locking piece will stay outside the locking hole. When it is in a movable state and rotates again, it is only necessary to rotate half the distance between the two locking holes in the same group to align the other locking piece with the locking holes in the group. Compared with the existing technology, the distance between each gear is smaller, and the rotation angle required for the chair back when switching gears is smaller. Therefore, under the same chair back rotation stroke, this solution can have more gears to provide users with more choices.

[0053] If locking parts and corresponding locking holes are added according to this solution, the effect can be further improved and more gears can be added.

[0054] Furthermore, a chassis is provided, such as Figure 1-3As shown, the chassis includes a fixed seat 9, a seat back connector 10 and the above-mentioned tilt locking mechanism. The base 1 is rotatably set on the fixed seat 9, and a first rotating shaft 11 is provided between the base 1 and the fixed seat 9. The axis of the first rotating shaft 11 is arranged in the front-to-back direction; a second rotating shaft 12 is provided between the tilting member 2 and the base 1, and the axis of the second rotating shaft 12 is arranged in the left-right direction; the seat back connector 10 is rotatably connected to the base 1, and a third rotating shaft 13 is provided between the seat back connector 10 and the base 1, and the axis of the third rotating shaft 13 is arranged in the left-right direction; the seat back connector 10 is linked to the tilting member 2, and a sliding rotating groove is provided on the seat back connector 10 15. A fourth rotating shaft 14 is provided on the reclining member 2, and the fourth rotating shaft 14 is inserted into the sliding rotating groove 15; in this solution, the fixed seat 9 is used to connect the lifting gas rod and the chair legs of the chair, the backrest connecting member 10 is used to connect the backrest, and the reclining member 2 can be used to connect the seat, so that the backrest and the seat are linked, and when the backrest tilts backward, the seat also rotates together; since the reclining member 2 is linked with the backrest connecting member 10, the locking of the locking member and the locking hole acts on the reclining movement of the seat and the backrest at the same time, and can have more gear options; in addition, when there is no linkage between the seat and the backrest, the backrest connecting member 10 can also directly serve as the reclining member 2.

[0055] The base 1 can swing left and right relative to the fixed base 9, and a first rotating shaft 11 is provided at the front and rear of the base 1 and the fixed base 9. Two springs 16 are also provided between the base 1 and the fixed base 9. The two springs 16 are located between the two first rotating shafts 11 in the front-to-back direction and on both sides of the first rotating shaft 11 in the left-right direction; the springs 16 provide buffering and reset capabilities for the left and right swinging of the base 1; the control member 8 includes an operating rod 81 inserted on the base 1 and an operating block 82 provided on the operating rod 81, the operating block 82 is sleeved on the operating rod 81 and fixedly connected to the operating rod 81 by screws, the operating block 82 rotates with the rotation of the operating rod 81 to control the lifting gas rod, and the operating block 82 can also slide and move with the operating rod 81 on the base 1; the tilting member 2 is a seat connecting member in this embodiment, which is used to install the seat , and the reclining member 2 is located above the base 1, and the left and right ends of the reclining member 2 extend downward to be connected to the second rotating shaft 12; the backrest connecting member 10 is a rocker and is located behind the base 1. The backrest connecting member 10 is rotatably connected to the rear end of the base 1 through the third rotating shaft 13; the rear end of the reclining member 2 is provided with two connecting plates 17 extending downward and backward, the two connecting plates 17 are located on the left and right sides of the backrest connecting member 10, the sliding and rotating groove 15 is opened in the middle position of the backrest connecting member 10, and the fourth rotating shaft 14 is inserted on the two connecting plates 17 and is located in the sliding and rotating groove 15; when the backrest tilts backward, the backrest connecting member 10 rotates backward and downward on the base 1, and the fourth rotating shaft 14 rotates and slides relative to the backrest connecting member 10 in the sliding and rotating groove 15, so that the backrest connecting member 10 drives the reclining member 2 to rotate backward relative to the base 1.

[0056] Specifically, the tilt locking mechanism also includes an elastic driving member, which is rotatably arranged on the base 1 and one end of the elastic driving member is arranged on the control member 8, and the other end of the elastic driving member is arranged on the first locking member 6 and the second locking member 7; the elastic driving member is configured to drive the first locking member 6 and the second locking member 7 to move when the control member 8 slides.

[0057] The elastic driving member is mainly used to link the control member 8 with the two locking members, so that the control member 8 can drive the locking members to move when the control member 8 moves; since the elastic driving member is elastic and can be elastically deformed, even if the first locking member 6 and the second locking member 7 cannot move, the elastic driving member can be deformed with the movement of the control member 8, so that the first locking member 6 and the second locking member 7 can alternately enter their corresponding locking holes and the overall movement can still proceed smoothly without conflict, that is, when the first locking member 6 enters the first locking hole 4, the second locking member 7 abuts against the second locking portion 32 under the action of the elastic driving member. On the other hand, when the second locking member 7 enters the second locking hole 5, the first locking member 6 abuts against the first locking portion 31 under the action of the elastic driving member; in addition, the elasticity also makes the elastic driving member have a delayed driving effect, that is, in the movable state, after the control member 8 moves, the first locking member 6 and the second locking member 7 are not yet aligned with their corresponding locking holes and cannot move. At this time, the elastic driving member is deformed due to the movement of the control member 8. When the chair back is rotated so that any locking member is aligned with any locking hole, the elastic force of the elastic driving member will drive the locking member into the aligned locking hole to switch to the locked state.

[0058] The elastic driving member may be only a single elastic member, but in this embodiment, Figure 5 、 7 As shown in Figure 10, the elastic driving member includes a first torsion spring 18 and a second torsion spring 19; the first torsion spring 18 and the second torsion spring 19 are both rotatably arranged on the base 1, the first torsion spring 18 is configured to connect the control member 8 and the first locking member 6, and the second torsion spring 19 is configured to connect the control member 8 and the second locking member 7; in the left and right directions, the first torsion spring 18 is located next to the second torsion spring 19, and the first locking member 6 and the second locking member 7 are spaced apart front to back, so the first torsion spring 18 and the second torsion spring 19 are also staggered in the front to back direction; the waist hole 24 corresponding to the torsion spring, the jack 23 on the locking member and other positions are also staggered front to back and left to right.

[0059] The first torsion spring 18 and the second torsion spring 19 each have two torsion spring arms. After the control member 8 moves, when the first locking member 6 or the second locking member 7 is restricted by the extension plate 3 and cannot move, the deformation of the first torsion spring 18 and the second torsion spring 19 is generated by the torsion spring arms; the torsion spring arm close to the control member 8 has an upwardly extending connecting portion 20, and the torsion spring arm close to the first locking member 6 and the second locking member 7 has a limiting portion 21; two connecting holes 22 are provided on the control member 8, and the two connecting portions 20 are respectively inserted into the two connecting holes 22, and the connecting holes 22 are specifically provided on the operating block 82. Since the positions of the connecting holes 22 also need to be staggered, it is easier to implement them on the operating block 82; the first locking member 6 and the second locking member 7 are both provided with insertion holes 23, and the two limiting The parts 21 are respectively inserted into the two insertion holes 23; two waist holes 24 are opened on the base 1, and the two waist holes 24 are respectively located above the first locking piece 6 and the second locking piece 7; the two limiting parts 21 protrude upward from the first locking piece 6 and the second locking piece 7 and enter the corresponding waist holes 24, and the limiting parts 21 cooperate with the waist holes 24 on the base 1 to limit the movement of the locking pieces; the insertion hole 23 of the first locking piece 6 is located in the middle of the first locking piece 6, and the insertion hole 23 of the second locking piece 7 is located at the end of the second locking piece 7 close to the extension plate 3; when two torsion springs of the same specifications are selected, the relative positions of the two connecting holes 22 correspond to the relative positions of the two insertion holes 23, that is, the positions of the two connecting holes 22 are one in front and one behind and spaced left and right.

[0060] The first locking member 6 and the second locking member 7 are both circular pins; the first locking hole 4 and the second locking hole 5 are both elliptical; the use of pins and elliptical locking holes can better control the gap between the two, so that the shaking generated during locking is smaller, and the structure is simpler, fewer parts are required, smaller modifications are made, and processing is more convenient; the pins can also ensure that the support strength is large enough to prevent damage.

[0061] like Figure 4 、 6 As shown in , 8, the first locking piece 6 and the second locking piece 7 are perpendicular to the extension plate 3, that is, perpendicular to the two locking parts; the two locking pieces are both arranged in the left and right directions. In this embodiment, there are four locking holes on the extension plate 3, namely, two first locking holes 4 and two second locking holes 5. The two first locking holes 4 are both located in front of the second locking holes 5. In the height direction, one of the first locking holes 4 is located at the bottom, and the other first locking hole 4 is located between the two second locking holes 5. That is, when the first locking piece 6 is inserted into the bottom first locking hole 4, the chassis is in the initial gear position. At this time, the second locking piece 7 is not aligned with any second locking hole 5 and abuts on the second locking part 32; when switching to the second gear position, the second locking piece 7 enters the lower second locking hole 5, and the first locking hole 4 abuts on the first locking part 31. And so on, the first locking piece 6 and the second locking piece 7 are locked with each other in an interlaced manner.

Claims

1. A tilt locking mechanism, characterized in that: include: a base configured as a main support for the mechanism; A tilting member, rotatably arranged on the base; An extension plate is vertically disposed on the tilting member, and is provided with a first locking portion and a second locking portion, wherein the first locking portion is located beside the second locking portion, the first locking portion includes a plurality of vertically arranged first locking holes, and the second locking portion includes a plurality of vertically arranged second locking holes; and the first locking holes and the second locking holes are staggered in the vertical direction; The first locking member and the second locking member are both slidably disposed on the base, the axes of the first locking member and the second locking member are both arranged horizontally and located beside the extension plate; the first locking member is located beside the second locking member and the axes of the two are parallel; a control member, slidably disposed on the base, the control member being configured to drive the first locking member and the second locking member to slide on the base when the control member slides; The first locking member is located beside the first locking portion, and the second locking member is located beside the second locking portion; the reclining member has a movable state and a locked state; In the movable state, the control member slides on the base to drive the first locking member to leave the first locking hole and the second locking member to leave the second locking hole, and the tilting member can rotate on the base; in the locked state, the control member slides on the base to drive the first locking member to enter the first locking hole or the second locking member to enter the second locking hole, and the tilting member and the base remain relatively stationary.

2. The tilt locking mechanism according to claim 1, wherein: It also includes an elastic driving member, which is rotatably arranged on the base and one end of the elastic driving member is arranged on the control member, and the other end of the elastic driving member is arranged on the first locking member and the second locking member; the elastic driving member is configured to drive the first locking member and the second locking member to move when the control member slides.

3. The tilt locking mechanism according to claim 2, wherein: The elastic driving member includes a first torsion spring and a second torsion spring; the first torsion spring and the second torsion spring are both rotatably arranged on the base, the first torsion spring is configured to connect the control member and the first locking member, and the second torsion spring is configured to connect the control member and the second locking member.

4. The tilt locking mechanism according to claim 3, wherein: The first torsion spring and the second torsion spring each have two torsion spring arms, the torsion spring arm close to the control member has an upwardly extending connecting portion, and the torsion spring arm close to the first locking member and the second locking member has a limiting portion; two connecting holes are provided on the control member, and the two connecting portions are respectively inserted into the two connecting holes; the first locking member and the second locking member each have an insertion hole, and the two limiting portions are respectively inserted into the two insertion holes.

5. The tilt locking mechanism according to claim 4, characterized in that: The base is provided with two waist holes, which are respectively located above the first locking piece and the second locking piece; the two limiting parts protrude upward from the first locking piece and the second locking piece and enter into the corresponding waist holes.

6. The tilt locking mechanism according to claim 4, characterized in that: The insertion hole of the first locking piece is located in the middle of the first locking piece, and the insertion hole of the second locking piece is located at the end of the second locking piece close to the extension plate.

7. The tilt locking mechanism according to claim 1, wherein: The first locking piece and the second locking piece are both circular pins; the first locking hole and the second locking hole are both elliptical.

8. The tilt locking mechanism according to claim 1, wherein: The first locking piece and the second locking piece are perpendicular to the extension plate.

9. A chassis, characterized in that: The invention comprises a tilt locking mechanism as described in any one of claims 1 to 8.

10. The tilt locking mechanism according to claim 9, characterized in that: It also includes a fixed seat and a backrest connecting member, the base is rotatably arranged on the fixed seat, a first rotating shaft is provided between the base and the fixed seat, and the axis of the first rotating shaft is arranged along the front-to-back direction; a second rotating shaft is provided between the tilting member and the base, and the axis of the second rotating shaft is arranged along the left-right direction; the backrest connecting member is rotatably connected to the base, a third rotating shaft is provided between the backrest connecting member and the base, and the axis of the third rotating shaft is arranged along the left-right direction; the backrest connecting member and the tilting member are linked, a sliding rotating groove is provided on the backrest connecting member, and a fourth rotating shaft is provided on the tilting member, and the fourth rotating shaft is inserted in the sliding rotating groove.

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