Chair back angle adjusting and locking device and seat thereof

Abstract

The utility model provides a chair back angle adjusting and locking device and a seat thereof, the chair back angle adjusting and locking device comprises a chair back warping plate pivotally connected with the rear side of a seat plate, and further comprises a backrest position locking mechanism arranged in the seat plate, the backrest position locking device comprises a linkage piece, an unlocking mechanism and a locking piece, the linkage piece is connected with the upper end of the chair back warping plate, and a positioning toothed plate is arranged on the linkage piece; the unlocking mechanism is arranged on the linkage piece; and the locking piece is inserted into or separated from the tooth groove of the positioning tooth plate along with the forward and backward movement of the unlocking mechanism so as to lock and unlock the linkage piece. The adjustable backrest has the advantages that the angle of the backrest can be locked at any time in the adjusting process and slowly released to prevent the backrest from rebounding, the back of a user is prevented from being impacted, and the experience degree of the user is improved.

Description

Technical Field

[0001] The utility model relates to the field of furniture, in particular to a chair back angle adjustment locking device and a chair thereof. Background Art

[0002] Now with the rapid development of science and technology, people's pressure is increasing day by day, and the pace of life is accelerating, resulting in people sitting on chairs to work more and more time. With the advent of the Internet era and the proposal of the concept of smart office, as well as people's pursuit of comfortable office, chairs with adjustable backrest angles have come into being. Most of the popular backrest chairs on the market are composed of a base, a seat, armrests and a backrest, wherein the base contains a support and a lifting rod and a chassis connecting the seat, armrests are arranged on the left and right of the seat, and a backrest is arranged at the back of the seat. However, the current backrest chairs have the following problems: (i) The backrest angle usually has only a few fixed gears that can be adjusted. After the angle of the backrest chair is adjusted, it can only be fixed at a specific position, which cannot adapt to different users. In addition, during the backrest adjustment process, the position positioning support is only supported by the spring clip. The backrest is easy to hit the customer's back due to rapid return, which affects the customer experience; (ii) The base is basically made of aluminum alloy materials, which not only has high manufacturing costs, but also has a large overall weight of the backrest chair, which is inconvenient to carry and move.

[0003] Therefore, there is an urgent need for a chair back angle adjustment and locking device and a seat thereof which can adjust and lock the chair back angle at any time during the adjustment process and has low manufacturing cost. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a chair back angle adjustment locking device and a seat thereof, which are used to solve the problems that the existing chair back cannot be adjusted to any angle, the chair back is prone to rapid rebound during the adjustment process, and the manufacturing cost is high.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides a chair back angle adjustment locking device, including a chair back rocker pivotally connected to the rear side of a seat plate, characterized in that it also includes a chair back position locking mechanism arranged in the seat plate, the chair back position locking mechanism includes a linkage, an unlocking mechanism and a locking member, the linkage is connected to the upper end of the chair back rocker, and a positioning tooth plate is provided on the linkage; the unlocking mechanism is arranged on the linkage; the locking member is inserted into or disengaged from the tooth groove of the positioning tooth plate as the unlocking mechanism moves forward and backward to achieve locking and unlocking of the linkage.

[0006] Preferably, the chair back rocker is L-shaped, and the upper end of the chair back rocker is provided with a plug-in shaft end extending along the width direction of the seat, and a linkage is installed at each end of the plug-in shaft end; a connecting shaft is rotatably passed through the bending part of the chair back rocker, and the chair back rocker is pivotally connected to the chassis under the seat plate through the connecting bolts; the chair back rocker is installed with.

[0007] Preferably, the chassis is located below the seat plate, and the chassis is an arc-shaped connecting member that is convex downward and hollow inside. The front end of the chassis is connected to the front end of the bottom of the seat plate, and the rear end of the chassis is pivotally connected to the rocker plate of the chair back through connecting bolts, and a mounting hole for mounting the support part is provided in the center of the bottom of the chassis.

[0008] More preferably, the main body of the chassis is an injection-molded plastic part, and the chassis is connected to the seat back through a seat back rocker, replacing the traditional aluminum alloy chassis with an easily manufactured plastic part, and the plastic part has plasticity in appearance. Compared with an aluminum alloy chassis, it has lower cost and lighter weight.

[0009] Preferably, the linkage members are in the shape of long strips and are arranged at intervals on both sides of the width direction of the seat plate. The rear end of each linkage member is provided with an axial hole for plugging and cooperating with the plug-in shaft end and a convex shaft for plugging and cooperating with the unlocking mechanism; the surface of each linkage member is provided with a guide groove for guiding the unlocking mechanism to move forward and backward; a plurality of strip-shaped through holes are provided at intervals in the guide groove, and each of the strip-shaped through holes is arranged along the width direction of the seat; a positioning tooth plate is installed on the side of the linkage member, and a plurality of tooth grooves arranged along the front and rear direction of the seat are evenly provided on the positioning tooth plate.

[0010] Preferably, the unlocking mechanism comprises a shell and a connecting slider, a U-shaped connecting piece and an unlocking handle arranged in the shell, the shell comprises a base and a guide cover plate, the base is connected to the linkage member, the guide cover plate is mounted on the linkage member, the rear portion of the guide cover plate is provided with an adjusting cavity for accommodating the connecting slider and limiting the movable range of the connecting slider and an adjusting slot for limiting the swing angle of the unlocking handle, the adjusting slot is wide at both ends and narrow in the middle and is connected to the adjusting cavity; the unlocking handle is inserted into the adjusting slot, the end of the unlocking handle extending out of the seat plate forms a force-applying end, and the end of the unlocking handle extending into the adjusting cavity is connected to the connecting slider; the two linkage members are commonly connected to the U-shaped connecting piece, the two sides of the rear portion of the U-shaped connecting piece are symmetrically provided with strip-shaped plug holes arranged along the front-to-back direction of the seat plate and plug-matched with the convex shaft, the two frame edges of the U-shaped connecting piece are respectively movably inserted into the corresponding guide grooves, the two frame edges are respectively provided with a plurality of inclined holes corresponding to the strip-shaped through holes, the two inclined holes corresponding to the positions on the two frame edges form a group, and the opening of each group of inclined holes is small in front and large in the back and arranged in an eight-shaped shape.

[0011] Preferably, a rectangular adjustment cavity is provided at the rear center of the guide cover plate, and the connecting slider can move forward and backward in the adjustment cavity. The adjustment groove on the guide cover plate is connected to the adjustment cavity, which can facilitate the installation of the unlocking handle. During the swinging process, the unlocking handle is restricted by the groove wall of the adjustment groove, so that the unlocking handle can only swing to a certain angle. When the unlocking handle is pulled forward to the locking position, the front side of the unlocking handle conflicts with the groove wall of the front side of the adjustment groove away from the positioning tooth plate; when the unlocking handle is pulled backward to the unlocking position, the rear side of the unlocking handle conflicts with the groove wall of the rear side of the adjustment groove away from the positioning tooth plate.

[0012] More preferably, a plurality of strip-shaped slide grooves are provided at the front of the base, and a positioning protrusion that can slide in the strip-shaped slide grooves is provided at the front of the guide cover.

[0013] Preferably, the connecting slider is a special-shaped part with a hollow structure, the rear end of the connecting slider is hinged to the U-shaped connecting piece, and the front end of the connecting slider is provided with an adjustment slot; a platform is provided in the adjustment cavity, and the front part of the platform is provided with a first hinge shaft, and the first hinge shaft is movably inserted in the adjustment slot of the connecting slider.

[0014] More preferably, the adjustment slot includes a straight slot section and a circular hole section connected at both ends of the straight slot section, the slot top width of the straight slot section is slightly smaller than the outer diameter of the first hinge shaft, and the slot bottom width of the straight slot section is slightly larger than the outer diameter of the first hinge shaft, so that the first hinge shaft will not get stuck when moving to the straight slot section and can smoothly enter the circular hole section; the inner diameter of the circular hole section is slightly larger than the outer diameter of the first hinge shaft, and when the first hinge shaft is inserted into the circular hole section, it corresponds to the locking state and unlocking state of the seat back angle adjustment locking device respectively.

[0015] Preferably, a columnar connecting protrusion is provided at the bottom of the adjusting groove; and the unlocking handle is hinged in the adjusting groove of the shell through the columnar connecting protrusion inserted in the unlocking handle.

[0016] Preferably, each linkage member corresponds to a locking member, and the locking member is a strip block arranged along the front-to-back direction of the seat, and the side of the locking member is provided with teeth for engaging with the tooth grooves, and the upper surface of the locking member is provided with a plurality of pins at intervals, and the pins are inserted into the strip-shaped through holes and the inclined holes aligned vertically from bottom to top in sequence.

[0017] Preferably, the left and right sides of the chair back further include armrests.

[0018] The utility model provides a seat, which is characterized by comprising the seat back angle adjustment locking device.

[0019] The working process of the seat back angle adjustment locking device of the utility model is as follows:

[0020] When in use, first pull the unlocking handle backward to the unlocking position, then the user leans against the chair back and applies a backward external force to the chair back. Since the chair back is connected to the chair back rocker, and the middle part of the chair back rocker is pivotally connected to the chassis under the seat plate, when the chair back applies a pressure to the lower part of the chair back rocker, the upper part of the chair back rocker moves backward, and the upper part of the chair back rocker is connected to the linkage part, and the chair back rocker drives the linkage part to move backward synchronously. Since the U-shaped connecting piece of the unlocking mechanism is provided with a strip-shaped jack, the U-shaped connecting piece remains stationary during the backward movement of the linkage part. When the chair back is adjusted to a suitable position, pull the unlocking handle backward to the unlocking position. Pull the unlocking handle to the locking position. During the pulling process, the unlocking handle drives the connecting slider to move backward in the adjustment cavity. Since the two frame sides of the U-shaped connecting piece are respectively provided with several oblique holes, the two oblique holes corresponding to the positions on the two frame sides are a group. The opening of each group of oblique holes is small in front and large in the back, arranged in an eight-shaped pattern, so that the pin inserted into the oblique hole will move forward relatively in the oblique hole. Since the oblique hole has a certain angle, the locking piece will not only move forward, but also move closer to the side of the positioning tooth plate. When the teeth on the locking piece are inserted into the tooth grooves of the positioning tooth plate, the locking piece will lock the positioning tooth plate, thereby locking the back of the chair. The entire locking process is convenient and effective, and the adjustment is convenient, and the back of the chair can be stopped at any position.

[0021] The beneficial effects of the present utility model are as follows: the present application realizes locking by plugging and cooperating the locking member with the corresponding positioning tooth plate, which not only can lock the chair back during the adjustment process, but also the entire locking is reliable. Even if one of the locking members fails, it will not affect the use of the reclining chair, and after unlocking, it can be slowly released to prevent the chair back from rebounding and hitting the user's back, thereby improving the customer experience. The chassis of the present application adopts injection-molded plastic parts, which not only has a simple manufacturing process and reduces manufacturing costs, but also reduces the weight of the entire seat, making it convenient to carry and use. In addition, the chassis shape can be injection-molded according to the design, which increases the ornamental and comfort properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Shown is a three-dimensional structural diagram of the seat back angle adjustment locking device of the utility model;

[0023] Figure 2 Shown is a front view of the seat back angle adjustment locking device of the present utility model;

[0024] Figure 3 Shown is a schematic diagram of the interior of the seat back angle adjustment locking device of the present invention with the housing removed;

[0025] Figure 4 Shown is a structural diagram of the chair back rocker of the utility model;

[0026] Figure 5 Shown is a structural diagram of the guide cover plate of the utility model;

[0027] Figure 6 Shown is a structural diagram of the base of the utility model;

[0028] Figure 7 Shown is a schematic diagram of the installation of the linkage member and the positioning tooth plate of the utility model;

[0029] Figure 8 The display is one of the three-dimensional structural diagrams of the positioning tooth plate of the utility model;

[0030] Fig. 9 The second three-dimensional structural diagram of the positioning tooth plate of the utility model is shown;

[0031] Fig.10 Shown is a front view of the positioning tooth plate of the utility model;

[0032] Fig.11 Shown is one of the structural diagrams of the locking member of the utility model;

[0033] Fig.12 The second structural diagram of the locking member of the utility model is shown;

[0034] Fig.13 Shown is a schematic diagram of the cooperation between the positioning tooth plate and the locking member of the utility model;

[0035] Fig.14 Shown is a structural diagram of the linkage member of the utility model;

[0036] Fig.15 Shown is a front view of the linkage member of the utility model;

[0037] Fig.16 Shown is a structural diagram of a U-shaped connecting piece of the utility model;

[0038] Fig.17 Shown is a structural diagram of the unlocking handle of the utility model;

[0039] Fig.18 The display is one of the three-dimensional structural diagrams of the seat of the present utility model;

[0040] Fig.19 The second three-dimensional structural diagram of the seat of the present invention is shown;

[0041] Fig. 20 Shown is a side view of the seat of the present invention;

[0042] Fig.21 Shown is a schematic diagram of the installation of the seat back angle adjustment locking device and the chassis of the utility model;

[0043] In the attached figure:

[0044] 1. Chair back rocker;

[0045] 11. Columnar structure;

[0046] 12. Connecting bolts;

[0047] 2. Seat plate;

[0048] 21. Chassis;

[0049] 3. Seat back position locking mechanism;

[0050] 31, linkage member; 311, shaft hole; 312, convex shaft; 313, strip through hole; 314, retaining edge; 315, rectangular slide groove; 316, limit member;

[0051] 32. unlocking mechanism; 300. housing; 320. base; 3201. strip-shaped slide groove; 3202. second plug-in protrusion; 3203. second plug-in hole; 321. guide cover plate; 3211. positioning protrusion; 322. connecting slider; 323. U-shaped connecting piece; 324. unlocking handle; 3241. hinge protrusion; 3242. pin hole; 325. oblique hole; 326. first hinge axis; 328. strip-shaped plug-in hole; 329. adjusting slot; 330. columnar connecting protrusion; 301. platform;

[0052] 33. Locking member; 331. Tooth;

[0053] 34, positioning tooth plate; 341, tooth groove; 342, first plug-in protrusion; 343, first plug hole;

[0054] 35. Buffer spring;

[0055] 4. Chair back;

[0056] 5. Handrails. DETAILED DESCRIPTION

[0057] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0058] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", "axial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0059] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In the above implementation modes, electrical connection refers to that the circuit structure can be turned on, and the specific method of realizing electrical connection may be conventional electrical connection methods such as welding and overlapping.

[0061] The present invention is further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0062] like Figure 1 to Figure 3As shown, the utility model provides a chair back angle adjustment locking device, comprising a chair back rocker 1 pivotally connected to the rear side of a seat plate 2, and also comprising a chair back position locking mechanism 3 arranged in the seat plate 2, the chair back position locking mechanism 3 comprising a linkage 31, an unlocking mechanism 32, a locking member 33 and a positioning tooth plate 34, the linkage 31 is connected to the upper end of the chair back rocker 1, the positioning tooth plate 34 is slidably arranged in the linkage 31; the unlocking mechanism 32 is arranged on the linkage 31; the locking member 33 is inserted into or disengaged from the tooth groove 341 of the positioning tooth plate 34 with the forward and backward movement of the unlocking mechanism 32 to achieve locking and unlocking of the linkage 31.

[0063] In some embodiments of the utility model, the chair back rocker 1 is L-shaped, and the upper end of the chair back rocker 1 is provided with a plug-in shaft end extending along the width direction of the seat, and a linkage member 31 is installed at each end of the plug-in shaft end; a connecting bolt 12 is rotatably passed through the bending part of the chair back rocker 1, and the chair back rocker 1 is pivotally connected to the chassis 21 under the seat plate 2 through the connecting bolt 12; a chair back 4 is installed on the chair back rocker 1.

[0064] In some embodiments of the utility model, the upper edge of the chair back rocker 1 is integrally formed with a columnar structure 11, the central axis of the columnar structure 11 is arranged along the width direction of the seat plate 2, and the two ends of the columnar structure 11 extend to both sides to form a plug-in shaft end that can be plugged in and matched with the linkage 3.

[0065] In some embodiments of the utility model, the chassis 21 is located below the seat plate 2, the chassis 21 is in a downward convex arch shape and is hollow inside, the front end of the chassis 21 is connected to the front end of the bottom of the seat plate 2, the rear end of the chassis 21 is pivotally connected to the chair back rocker 1 through a connecting bolt 12, and the bottom of the chassis 21 is provided with an installation hole for installing the support part.

[0066] In some embodiments of the utility model, the main body of the chassis is an injection-molded plastic part, and the chassis is connected to the backrest through the backrest rocker, replacing the traditional aluminum alloy chassis with an easily manufactured plastic part, and the plastic part has plasticity in appearance and shape, and is lower in cost and lighter in weight than the aluminum alloy chassis, and is more practical. Specifically, the chassis in the present application can be made of PA plus glass fiber material, which can not only ensure the strength of the chassis, but also the chassis shape can be injection molded according to the design, which increases the ornamental and comfort.

[0067] In some embodiments of the utility model, the linkage members 31 are in the shape of long strips and are arranged at intervals on both sides of the width direction of the seat plate 2. The rear end of each of the linkage members 31 is provided with an axial hole 311 for plugging and cooperating with the plug-in shaft end and a convex shaft 312 for plugging and cooperating with the unlocking mechanism 32; the surface of each of the linkage members 31 is provided with a guide groove for guiding the unlocking mechanism 32 to move forward and backward; a plurality of strip-shaped through holes 313 are arranged at intervals in the guide groove, and each of the strip-shaped through holes 313 is arranged along the width direction of the seat; a positioning tooth plate 34 is slidably arranged in the linkage member 31, and a plurality of tooth grooves 341 arranged along the front and rear direction of the seat are evenly provided on the positioning tooth plate 34.

[0068] In some embodiments of the present invention, the two linkage members 31 are in a horizontal state, the two linkage members 31 are arranged along the front-to-back direction of the seat plate, and the linkage members 31 are perpendicular to the columnar structure 11 .

[0069] In some embodiments of the present invention, a row of buffer springs 35 is disposed between the two linkage members 31 .

[0070] In some embodiments of the utility model, the unlocking mechanism 32 includes a shell 300 and a connecting slider 322, a U-shaped connecting piece 323, and an unlocking handle 324 arranged in the shell 300. The shell includes a base 320 and a guide cover plate 321. The base 320 is slidably matched with the linkage member 31. The guide cover plate 321 is installed on the linkage member 31. The rear part of the guide cover plate 321 is provided with an adjustment cavity for accommodating the connecting slider 322 and limiting the range of motion of the connecting slider 322, and an adjustment groove 329 for limiting the swing angle of the unlocking handle 324. The adjustment groove is wide at both ends and narrow in the middle and is connected to the base 320. The unlocking handle 324 is inserted into the adjusting groove 329, and the end of the unlocking handle 324 extending from the seat plate forms a force-applying end, and the end of the unlocking handle 324 extending into the adjusting cavity is connected to the connecting slider 322; the two linkage parts are commonly connected to the U-shaped connecting piece 323, and the two sides of the rear part of the U-shaped connecting piece 323 are symmetrically provided with strip-shaped plug holes 328 arranged along the front and rear directions of the seat plate and plugged with the convex shaft 312, and the two frame edges of the U-shaped connecting piece 323 are respectively movably inserted in the corresponding guide grooves, and the two frame edges are respectively provided with a plurality of inclined holes 325 corresponding to the strip-shaped through holes 313.

[0071] In some embodiments of the utility model, the surface of the linkage member 31 is provided with a pair of spaced-apart, relatively arranged guard edges 314, and the guard edges 314 are arranged along the front-to-back direction of the seat 2. The two guard edges 314 and the surface of the linkage member 31 form guide grooves for guiding the U-shaped connecting piece movably inserted in the corresponding guide groove so that it can only move in the front-to-back direction of the seat 2.

[0072] In some embodiments of the present invention, a limiting member is provided at the front end of the linkage member 31 to limit the travel of the U-shaped connecting piece 323 .

[0073] In some embodiments of the utility model, a first plug-in protrusion 342 and a first plug-in hole 343 are provided on the side of the positioning tooth plate 34 facing away from the tooth groove 341, and a second plug-in protrusion 3202 plug-matched with the first plug-in hole 343 and a second plug-in hole 3203 for plug-matching with the first plug-in protrusion 342 are provided on the base 320.

[0074] In some embodiments of the present invention, the cross section of the positioning tooth plate 34 is T-shaped.

[0075] In some embodiments of the present invention, a strip-shaped slide groove 3201 is provided at the front of the base 320 , and a positioning protrusion 3211 that can slide in the strip-shaped slide groove is provided at the front of the guide cover plate 321 .

[0076] In some embodiments of the utility model, two oblique holes 325 corresponding to the positions on the two frame sides are grouped together, and the openings of each group of oblique holes 325 are arranged in an eight-shaped pattern with the openings being small in the front and large in the back. The arrangement of each group of oblique holes 325 is not limited to the eight-shaped pattern, as long as the locking member can be inserted into or removed from the tooth groove synchronously. This embodiment is demonstrated by taking the eight-shaped arrangement as an example.

[0077] In some embodiments of the utility model, a rectangular adjustment cavity is provided at the rear center of the guide cover plate 321, and the connecting slider 322 can move forward and backward in the adjustment cavity. An adjustment groove 329 is provided on one side of the guide cover plate 321, which can facilitate the installation of the unlocking handle 324. During the swinging process, the unlocking handle 324 is restricted by the groove wall of the adjustment groove 329, so that the unlocking handle 324 can only swing to a certain angle. When the unlocking handle 324 is pulled forward to the locking position B, the front side of the unlocking handle 324 conflicts with the groove wall of the front side of the adjustment groove 329 away from the positioning tooth plate; when the unlocking handle 324 is pulled backward to the unlocking position A, the rear side of the unlocking handle 324 conflicts with the groove wall of the rear side of the adjustment groove 329 away from the positioning tooth plate. The adjustment cavity can also be replaced by a hollow window, and a platform is set in front of the hollow window.

[0078] In some embodiments of the utility model, the connecting slider 322 is a special-shaped part with an I-shaped hollow structure, the rear end of the connecting slider 322 is hinged to the U-shaped connecting piece 323, and the front end of the connecting slider 322 is provided with an adjustment slot; a platform 301 is provided in the adjustment cavity, and a first hinge shaft 326 is provided on the platform 301, and the first hinge shaft 326 is movably inserted in the adjustment slot of the connecting slider 322.

[0079] In some embodiments of the present invention, a hinged protrusion 3241 is provided at the end of the unlocking handle 324 extending into the adjusting cavity, and the unlocking handle 324 is hinged to the connecting slider 322 via the hinged protrusion 3241 .

[0080] In some embodiments of the utility model, a pin hole 3242 is provided on the unlocking handle 324, and a columnar connecting protrusion 330 inserted into the pin hole 3242 is provided in the middle position of the adjusting groove 329. The unlocking handle 324 is inserted into the adjusting groove 329. Since the adjusting groove 329 is wide at both ends and narrow in the middle, the unlocking handle 324 can only rotate at a certain angle.

[0081] In some embodiments of the present invention, a columnar connecting protrusion 330 is provided at the bottom of the adjusting groove, and the unlocking handle 324 is hinged in the adjusting groove of the guide cover plate 321 through the columnar connecting protrusion 330 inserted in the unlocking handle 324 .

[0082] In some embodiments of the utility model, each linkage member 31 corresponds to a locking member 33, and the locking member 33 is a strip block arranged along the front-to-back direction of the seat. The side of the locking member 33 is provided with teeth 331 for engaging with the tooth groove 341. The locking member 33 is inserted with a plurality of pins at intervals, and the pins are inserted into the vertically aligned strip through hole 313 and the inclined hole 325 from bottom to top.

[0083] In some embodiments of the present invention, the left and right sides of the chair back body 1 further include armrests 5 .

[0084] The utility model discloses a seat, comprising the seat back angle adjustment locking device.

[0085] The working process of the seat back angle adjustment locking device of the utility model is as follows:

[0086] When in use, first pull the unlocking handle 324 backward to adjust to the unlocking position A, and then press the seat back backward to apply a backward external force to the seat back. Since the seat back is connected to the seat back rocker 1, and the middle part of the seat back rocker 1 is pivotally connected to the chassis 21 under the seat plate 2, the seat back will apply a forward pressure to the lower part of the seat back rocker 1, so that the upper part of the seat back rocker 1 will move backward. The upper part of the seat back rocker 1 is connected to the linkage member 31, and the seat back rocker 1 will drive the linkage member 31 to move backward synchronously. Since the U-shaped connecting piece 323 of the unlocking mechanism 32 is provided with a strip socket 328, the U-shaped connecting piece 323 remains stationary during the backward movement of the linkage member 31. When the seat back is adjusted to a suitable position, pull the unlocking handle 32 forward. 4 to the locking position B. During the pulling process, the unlocking handle 324 drives the connecting slider 322 to move backward in the adjusting cavity. Since the two frame sides of the U-shaped connecting piece 323 are respectively provided with a plurality of inclined holes 325, the two inclined holes 325 corresponding to the positions on the two frame sides are a group, and the opening of each group of inclined holes 325 is small in front and large in the back, arranged in an eight-shaped pattern, so that the pin inserted into the inclined hole 325 will move forward relatively in the inclined hole. Since the inclined hole has a certain angle, the locking member 33 not only has the forward movement, but also moves toward the side of the positioning tooth plate 34. When the teeth 331 on the locking member 33 are inserted into the tooth grooves 341 of the positioning tooth plate 34, the locking member 33 realizes the locking of the positioning tooth plate 34, and then realizes the locking of the chair back. The whole locking process is convenient and effective, and the adjustment is convenient, and the chair back can be stopped at any position.

[0087] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A seat back angle adjustment locking device, comprising a seat back rocker plate (1) pivotally connected to the rear side of a seat plate (2), characterized in that: The invention also comprises a backrest position locking mechanism (3) arranged in the seat plate (2), the backrest position locking mechanism (3) comprising a linkage member (31), an unlocking mechanism (32) and a locking member (33), the linkage member (31) being connected to the upper end of the backrest rocker (1), the linkage member (31) being provided with a positioning tooth plate (34); the unlocking mechanism (32) being arranged on the linkage member (31); the locking member (33) being inserted into or disengaged from the tooth groove (341) of the positioning tooth plate (34) as the unlocking mechanism (32) moves forward and backward to achieve locking and unlocking of the linkage member (31).

2. The seat back angle adjustment locking device according to claim 1, characterized in that: The backrest rocker (1) is L-shaped, and the upper end of the backrest rocker (1) is provided with a plug-in shaft end extending in the seat width direction, and a linkage member (31) is installed at each end of the plug-in shaft end; a connecting shaft (12) is rotatably passed through the bending part of the backrest rocker (1), and the backrest rocker (1) is pivotally connected to the chassis (21) below the seat plate (2) through the connecting shaft (12); and a seat back (4) is installed at the lower part of the backrest rocker (1).

3. The seat back angle adjustment locking device according to claim 2, characterized in that: The linkage members (31) are in the shape of long strips and are arranged at intervals on both sides of the width direction of the seat plate (2). The rear end of each linkage member (31) is provided with an axial hole (311) for plugging and matching with the plug-in shaft end and a convex shaft (312) for plugging and matching with the unlocking mechanism (32); the surface of each linkage member (31) is provided with a guide groove for guiding the unlocking mechanism (32) to move forward and backward; a plurality of strip-shaped through holes (313) are arranged at intervals in the guide groove, and each of the strip-shaped through holes (313) is arranged along the width direction of the seat; a positioning tooth plate (34) is installed on the side of the linkage member (31), and a plurality of tooth grooves (341) are evenly arranged along the front-back direction of the seat on the positioning tooth plate (34).

4. The seat back angle adjustment locking device according to claim 3, characterized in that: The unlocking mechanism (32) comprises a shell and a connecting slider (322) arranged in the shell, a U-shaped connecting piece (323), and an unlocking handle (324); the shell comprises a base (320) and a guide cover plate (321) arranged on the base; the base (320) is connected to the linkage member (31); the guide cover plate (321) is installed on the linkage member (31); the rear portion of the guide cover plate (321) is provided with an adjustment cavity for accommodating the connecting slider (322) and limiting the range of motion of the connecting slider (322) and an adjustment groove for limiting the swing angle of the unlocking handle (324); the adjustment groove is wide at both ends and narrow in the middle and is connected to the adjustment cavity; the unlocking handle (324) is inserted into the adjustment groove, and the unlocking handle (324) is unlocked. The end of the lock handle (324) extending from the seat plate forms a force-applying end, and the end of the unlock handle (324) extending into the adjustment cavity is connected to the connecting slider (322); the two linkage members are commonly connected to the U-shaped connecting piece (323); the two sides of the rear part of the U-shaped connecting piece (323) are symmetrically provided with strip-shaped plug holes (328) arranged along the front-to-back direction of the seat plate and plugged with the convex shaft (312); the two frame edges of the U-shaped connecting piece (323) are respectively movably inserted into the corresponding guide grooves; the two frame edges are respectively provided with a plurality of inclined holes (325) corresponding to the strip-shaped through holes (313); the two inclined holes (325) corresponding to the positions on the two frame edges form a group; the opening of each group of inclined holes (325) is small in front and large in the back and arranged in an eight-shaped shape.

5. The seat back angle adjustment locking device according to claim 4, characterized in that: A rectangular adjustment cavity is provided at the rear center of the guide cover plate (321).

6. The seat back angle adjustment locking device according to claim 4, characterized in that: The connecting slider (322) is a special-shaped part with a hollow structure. The rear end of the connecting slider (322) is hinged to the U-shaped connecting piece (323). The front end of the connecting slider (322) is provided with an adjustment slot. A platform is provided in the adjustment cavity, and a first hinge shaft (326) is provided on the platform. The first hinge shaft (326) is movably inserted in the adjustment slot of the connecting slider (322).

7. The seat back angle adjustment locking device according to claim 6, characterized in that: The adjustment slot comprises a straight slot section and a circular hole section connected at both ends of the straight slot section, the slot width of the straight slot section is slightly smaller than the outer diameter of the first hinge shaft (326), the inner diameter of the circular hole section is slightly larger than the outer diameter of the first hinge shaft, and when the first hinge shaft (326) is inserted into the circular hole section, it corresponds to the locking state and the unlocking state of the seat back angle adjustment locking device respectively.

8. The seat back angle adjustment locking device according to claim 4, characterized in that: A columnar connecting protrusion (330) is provided at the bottom of the adjusting groove, and the unlocking handle (324) is hinged in the adjusting groove of the guide cover plate (321) via the columnar connecting protrusion (330) inserted in the unlocking handle (324).

9. The seat back angle adjustment locking device according to claim 4, characterized in that: Each linkage member (31) corresponds to a locking member (33), the locking member (33) being a strip-shaped block arranged along the front-rear direction of the seat, the side surface of the locking member (33) being provided with teeth (331) for engaging with the tooth groove (341), the locking member (33) being provided with a plurality of pins inserted at intervals, the pins being inserted into the strip-shaped through holes (313) and the inclined holes (325) aligned vertically from bottom to top in sequence.

10. A seat, characterized in that: It comprises a seat back angle adjustment locking device as claimed in any one of claims 1 to 9.

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