Chair and tray

Abstract

The present invention discloses a chair and a tray thereof; the chair comprises a base for installing chair legs, a top base for installing a chair seat and a tail base for installing a chair back, the base is movably connected to the top base via a first connecting shaft, the base is hinged to the tail base via a fourth connecting shaft, the tail base is hinged to the top base via a fifth connecting shaft, the first connecting shaft is located between the fifth connecting shaft and is provided with an elastic reset member, the chair also comprises a lock plate swingably arranged in the base, the fourth connecting shaft passes through the lock plate, a third connecting shaft passes through the lock plate, both ends of the third connecting shaft are connected to two second connecting parts of the tail base, the third connecting shaft passes through the base and is slidably connected thereto; the present scheme makes the tray more compact and the locking effect more stable by arranging components and reset members for locking.

Description

Technical Field

[0001] The invention relates to the field of home furnishings, and in particular to a chair and a tray thereof. Background Art

[0002] Chairs have become a must-have in people's daily lives. Nowadays, whether it is an ordinary home chair, an e-sports chair or some chairs with other purposes, they all have the function of lifting and adjusting the backrest. In addition to some external accessories such as cushions, seat cushions, gas rods and other materials, the chair tray is particularly important as an important connection and control component. Its safety and stability will directly affect the overall use of the chair.

[0003] Chinese Patent 202010885721.0 introduces a chair and its self-load tray, which records: it includes a fixed seat fixedly connected to the seat support rod, a first base fixedly connected to the seat and a second base fixedly connected to the chair back, the fixed seat is also provided with two first spring assemblies, a lock plate, a first connecting shaft and a second connecting shaft, the first connecting shaft is located in front of the second connecting shaft, one end of the second base is hinged to the first base, and the other end of the second base is hinged to the fixed seat, the first base is movably connected to the fixed seat through the first connecting shaft, the second connecting shaft is fixedly installed on the fixed seat, the front end of the lock plate is rotatably installed on the first connecting shaft, the rear end of the lock plate is movably connected to the second connecting shaft, the two first spring assemblies are respectively located on both sides of the lock plate, and the front end of the first spring assembly The first spring assembly is movably connected to the first connecting shaft, the rear end of the first spring assembly is movably connected to the second connecting shaft, and a tilt locking assembly is also provided, including a tilt cable and a first mounting seat and a lock tongue mounting seat as shown in the figure installed on the fixed seat, and a second spring assembly installed on the first mounting seat that can move left and right and a lock tongue assembly installed on the lock tongue mounting seat that can move left and right, and a plurality of locking parts are provided on the lock plate, and the second spring assembly can move left and right on the first mounting seat by tightening and loosening the tilt cable, thereby driving the lock tongue assembly to move left and right on the lock tongue mounting seat and then cooperate with the locking part to limit the rotation of the lock plate; the plurality of locking parts at least include a first locking long hole and a second locking long hole distributed at intervals, the first locking long hole is located behind the second locking long hole, and both ends of the first locking long hole and the second locking long hole are both pointing to the up and down direction. In the above scheme, the locking plate structure and the reset structure of the tray are connected to each other, so that the structure for locking occupies more tray space; at the same time, the locking part is in the form of a long hole and the arrangement between the two long holes makes the locking effect of the tray unstable when locked by the lock tongue member. Summary of the invention

[0004] In order to solve the above problems, an object of the present invention is to provide a chair and a tray thereof with a more compact structure and more stable locking.

[0005] In order to achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a tray, comprising a base for installing chair legs, a top seat for installing a chair seat and a tail seat for installing a chair back, the top seat is provided with a first connecting portion extending downward, the tail seat comprises a second connecting portion extending forward, the base is movably connected to the first connecting portion of the top seat via a first connecting shaft, the base is hinged to the second connecting portion of the tail seat via a fourth connecting shaft, the tail seat is hinged to the first connecting portion of the top seat via a fifth connecting shaft, the first connecting shaft is located behind the fifth connecting shaft, the fourth connecting shaft is located between the first connecting shaft and the fifth connecting shaft, the fourth connecting shaft is located between the first connecting shaft and the fifth connecting shaft, and an elastic reset member is provided between the first connecting shaft and the fifth connecting shaft.

[0006] Preferably, there are two first connecting parts, there are two second connecting parts, the base is located between the two second connecting parts, and the two second connecting parts are located between the two first connecting parts.

[0007] Preferably, it also includes a lock plate swingably arranged in the base, the fourth connecting shaft passes through the lock plate, a third connecting shaft passes through the lock plate, both ends of the third connecting shaft are connected to the two second connecting parts of the tail stock, so as to realize synchronous movement of the lock plate and the tail stock, and the third connecting shaft passes through the base and is slidably connected thereto.

[0008] Preferably, the fourth connecting shaft and the third connecting shaft are located between the first connecting shaft and the fifth connecting shaft, the third connecting shaft is located below the fifth connecting shaft, and the third connecting shaft is located in front of the fourth connecting shaft.

[0009] Preferably, it also includes a tilt locking assembly located below the third connecting shaft, including a tilt pull line and a first mounting seat and a lock tongue mounting seat on the mounting base, a spring assembly that can move left and right is installed on the first mounting seat, and a lock tongue assembly that can move left and right is installed on the lock tongue mounting seat, and a plurality of locking parts are provided on the lock plate, and the spring assembly can be moved left and right on the first mounting seat by tightening or loosening the tilt pull line, thereby driving the lock tongue member to move left and right on the lock tongue mounting seat, and then cooperating with the plurality of locking parts to limit the swing of the lock plate, and then controlling the tilt angle of the tail stock through the third connecting shaft, the locking part is a locking hole, and the lock tongue member is a locking pin, and the locking hole and the locking pin are plug-in connected.

[0010] Preferably, it also includes a lifting and locking assembly, including a lifting cable and a pressure plate hinged in the base, the pressure plate is movably connected to the lifting cable; a cable steering sleeve is provided on the fourth connecting shaft, and the lifting cable starts from the pressure plate and extends forward through the bottom of the cable steering sleeve.

[0011] Preferably, a top simple cover is fixedly connected to the front end of the top seat, a bottom simple cover is hingedly connected to the front end of the base, the top simple cover covers the bottom simple cover and is movably connected to the top simple cover, and the top simple cover is movably connected to the bottom simple cover.

[0012] Preferably, the top simple cover is protruded with a second connecting shaft, the bottom simple cover is provided with a second sliding hole, and the second connecting shaft is located in the second sliding hole.

[0013] Preferably, the elastic reset member includes a compression spring and a retractable guide member, both ends of the guide member are rotatably mounted on the first connecting shaft and the fifth connecting shaft respectively, and the compression spring is located between the first connecting shaft and the fifth connecting shaft and is sleeved on the guide member.

[0014] A chair comprises a tray as described above.

[0015] In the technical solution of the present invention, the position of the sliding connection between the tailstock and the base is located at the rear, and the spacing between the first connecting axis and the fifth connecting axis can be flexibly changed according to the actual usage scenario, so that the pallet is more compact; the locking plate is directly connected to the sliding setting in the base, and the locking plate and the tailstock achieve synchronous action through the third connecting axis and the fourth connecting axis, so that when the pallet is in a locked state, it is more stable and effective; the locking plate and the tilting assembly used for locking are all located below the first connecting axis and the fifth connecting axis, so that the locking plate can swing in a small range to complete the locking action, thereby further compacting the pallet structure and making the locking effect more precise and stable; the locking plate is fan-shaped, and the locking hole for locking is close to the arc-shaped edge of the locking plate, so that the volume of the locking plate can be reduced; the locking plate is located below the third connecting axis, so that the tilting locking assembly matched with it is reduced, making the structure of the pallet more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the chair of the present invention;

[0017] Figure 2 An exploded view of the chair structure of the present invention;

[0018] Figure 3 The connection structure of the base, tailstock and top stock of the present invention is shown in FIG. Figure 1 ;

[0019] Figure 4 The connection structure of the base, tailstock and top stock of the present invention is shown in FIG. Figure 2 ;

[0020] Figure 5 The structure of the tilt locking assembly and the lifting locking assembly of the present invention is schematically shown. Figure 1 ;

[0021] Figure 6The structure of the tilt locking assembly and the lifting locking assembly of the present invention is schematically shown. Figure 2 ;

[0022] Figure 7 The structure of the tilt locking assembly and the lifting locking assembly of the present invention is schematically shown. Figure 3 .

[0023] 1. Base; 11. First sliding hole; 12. Bottom simple cover; 13. Second sliding hole; 2. Top seat; 21. First connecting part; 22. Third sliding hole; 23. Top simple cover; 3. Tail seat; 31. Second connecting part; 32. Tail plate; 4. Elastic reset assembly; 41. Compression spring; 42. Guide piece; 5. Tilt locking assembly; 51. First mounting seat; 52. Lock plate; 53. Lock tongue piece; 54. Second blocking part; 55. Connecting piece; 56. Lock tongue mounting seat; 57. Second mounting seat; 58. Pressing plate; 59. Switch torsion spring; 61. First connecting shaft; 62. Second connecting shaft; 63. Third connecting shaft; 64. Fourth connecting shaft; 65. Fifth connecting shaft; 71. Tilt cable; 72. Lift cable; 73. Locking part; 74. Locking spring; 75. Cable steering sleeve; 76. First blocking part. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which 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 intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" 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 invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection 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.

[0028] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] The reference orientation of each component in this specific implementation manner is that when the chair is normally installed and used, the front of the chair is the front end and the front part, and the rear of the office chair including the position where the backrest is located is the rear end and the rear part.

[0030] like Figure 1-4 A pallet is shown, comprising a base 1 for connecting chair legs, a top seat 2 for installing a chair seat and a tail seat 3 for installing a chair back; the base 1 is movably connected to the top seat 2, the base 1 and the tail seat 3 are hinged, the top seat 2 and the tail seat 3 are hinged, and also comprises a locking plate 52 swingably arranged on the base 1, and the locking of the swing angle of the tail plate 3 is achieved by controlling the swing angle of the locking plate 52.

[0031] In this embodiment, the top seat 2 is integrally formed with two first connecting parts 21 extending downward, the tail seat 3 includes two second connecting parts 31, a tail plate 32 is fixed between the two second connecting parts 31, the base 1 is located between the two second connecting parts 31, the base 1 is located in front of the tail plate 32, the two second connecting parts 31 are located between the two first connecting parts 21, the base 1 is movably connected to the two first connecting parts 21 of the top seat 2 through a first connecting shaft 61, and the base 1 is hinged to the two second connecting parts 31 of the tail seat 3 through a fourth connecting shaft 64. The tail stock 3 is hinged to the first connecting portion 21 of the top stock 2 through the fifth connecting shaft 65, the fourth connecting shaft 64 passes through the locking plate 52, the locking plate 52 and the two second connecting portions 31 are hinged through the third connecting shaft 63, the fourth connecting shaft 64 and the third connecting shaft 63 are located between the first connecting shaft 61 and the fifth connecting shaft 65, an elastic reset member 4 is provided between the first connecting shaft 61 and the fifth connecting shaft 65, and the third connecting shaft 63 and the fourth connecting shaft 64 are located below the first connecting shaft 61 and the fifth connecting shaft 65.

[0032] With such arrangement, when a human body leans backwards and exerts force on the chair back, the chair back drives the tail stock 3 to rotate around the fourth connecting shaft 64, and the front ends of the two second connecting parts 31 of the tail stock 3 rise and move backwards, and the fourth connecting shaft 64 drives the top seat 2 to move upwards and backwards, and the two first connecting parts 21 of the top seat 2 slide relative to the first connecting shaft 61, and the elastic reset component 4 is compressed to generate a reaction force with the fifth connecting shaft 65. The reaction force generated by the elastic reset component 4 can make the human body smoother during the leaning process, avoiding the chair back from moving quickly and directly to the leaning angle.

[0033] In this embodiment, the two first connecting parts 21 of the top seat 2 are both provided with a third sliding hole 22, and the two ends of the first connecting shaft 61 are divided into two third sliding holes 22, and the first connecting shaft 61 is slidingly matched with the two third sliding holes 22; two sliding sleeves are sleeved on the first connecting shaft 61, and the base 1 is located between the two sliding sleeves, and the sliding sleeves are located in the third sliding hole 22 and are slidingly matched.

[0034] In this embodiment, the fifth connecting shaft 65 is located in front of the base 1, the first connecting shaft 61 is located in the rear section of the base 1 and above the two second connecting parts 31 of the tail stock 3, and the fourth connecting shaft 64 and the third connecting shaft 63 are located between the first connecting shaft 61 and the fifth connecting shaft 65.

[0035] Further preferably, the third connecting shaft 63 is located in front of the fourth connecting shaft 64. The left and right sides of the base 1 are provided with inclined first sliding holes 11, the first sliding holes 11 are located in front of the fourth connecting shaft 64, the third connecting shaft 63 passes through the two first sliding holes 11 on the base 1, and the first sliding holes 11 and the third connecting shaft 63 are slidably matched; in this way, when the tailstock 3 rotates to a certain angle, the third connecting shaft 63 conflicts with the two first sliding holes 11, and the tailstock 3 will no longer move, so as to avoid the risk of rollover caused by excessive tilting angle, and at the same time avoid the excessive tilting angle causing the other components in the tray to squeeze each other, thereby producing a practical effect.

[0036] Further preferably, the lowest point of the sliding travel of the third connecting shaft 63 is higher than the lowest point of the fourth connecting shaft 64 .

[0037] With such arrangement, the tailstock 3 rotates around the fourth connecting shaft 64 , and thus the initial action when the tailstock 3 tips over is that the tailstock 3 drives the third connecting shaft 63 to move upward and backward, thereby avoiding a complicated movement path and improving the stability of the pallet.

[0038] In this embodiment, it also includes a top simple cover 23 and a bottom simple cover 12. The top simple cover 23 is fixed on the front side section of the bottom of the top seat 2. The bottom simple cover 12 is hinged to the front end of the base 1. The top simple cover 23 and the bottom simple cover 12 are slidably matched. The fifth connecting shaft 65 is located on the inner side of the top simple cover 23.

[0039] Further preferably, the top simple cover 23 is arc-shaped and the left and right sides are bent backward to cover the top section of the bottom simple cover 12. The left and right sides of the top simple cover 23 are protruding inward with second connecting shafts 62. The left and right sides of the bottom simple cover 12 are provided with inclined second sliding holes 13. The second connecting shafts 62 extend into the second sliding holes 13 and movably cooperate with them. In this way, the front ends of the two second connecting parts 31 of the tail stock 3 are blocked by the top simple cover 23. When the top seat 1 moves upward and drives the top simple cover 23 to move, the top simple cover 23 drives the second connecting shaft 62 to slide in the second sliding holes 13 to achieve a unfolded visual effect.

[0040] In this embodiment, the elastic reset component 4 is as follows Figure 1 and Figure 2 As shown, it comprises a compression spring 41 and a retractable guide member 42 , both ends of the guide member 42 are movably connected to the first connecting shaft 61 and the fifth connecting shaft 65 , respectively, and the compression spring 41 is sleeved on the guide member 42 .

[0041] Further preferably, a reset sleeve is fixed at one end of the guide member 42, and the reset sleeve is sleeved on the fifth connecting shaft 65. A limiting block is fixed at the other end of the guide member 42, and an arc groove is provided on the limiting block. The limiting block presses the first connecting shaft 61 through the arc groove. The two ends of the compression spring 41 press the reset sleeve and the limiting block respectively. The guide member 4 is a guide column and a guide sleeve that are plug-in connected.

[0042] In this embodiment, the tray also includes Figure 5-7 The tilt locking assembly 5 for controlling the tilt angle of the tailstock 3 shown in the figure is located below the lock plate 52 and the third connecting shaft 63. The tilt locking assembly 5 includes a tilt cable 71 and a first mounting seat 51 and a lock tongue mounting seat 56 mounted in the base 1. A lock tongue assembly that can move left and right is mounted on the lock tongue mounting seat 56. A spring assembly that can move left and right is mounted on the first mounting seat 51. A plurality of locking portions 73 are provided on the lock plate 52. By tightening or loosening the tilt cable 71, the spring assembly can move left and right on the first mounting seat 51, thereby driving the lock tongue assembly to move left and right on the lock tongue mounting seat 56, and then cooperating with the plurality of locking portions 73 to limit the swing of the lock plate 52, thereby controlling the tilt angle of the tailstock 3 through the third connecting shaft 63. With such arrangement, when the tilt locking assembly 5 is in a locked state, the lock plate 52, the base 1, the top seat 2 and the tail seat 3 form a stable four-bar linkage, which is different from the three-bar linkage of a traditional pallet and operates more smoothly.

[0043] Further preferably, the first mounting seat 51 is located below the third connecting shaft 63, and the locking tongue mounting seat 56 is located in front of the first mounting seat 51; such a setting reasonably utilizes the space in the base 1, makes the various components in the pallet highly centralized, and effectively reduces the occupied volume of the pallet.

[0044] In this embodiment, the spring assembly includes a sliding rod slidably arranged on the first mounting seat 51, the sliding rod passes through the first mounting seat 51, and the two ends of the sliding rod are respectively provided with a first blocking portion 76 and a second blocking portion 54, and the first mounting seat is located between the first blocking portion 76 and the second blocking portion 54. The spring assembly also includes a locking spring 74, and the locking spring 74 is sleeved on the sliding rod, and the locking spring 74 is located between the second blocking portion 54 and the first mounting seat 51; the lock tongue assembly includes a lock tongue member 53 and a connecting member 55, the lock tongue member 53 passes through the lock tongue fixing seat 56 and slidably cooperates therewith, one end of the connecting member 55 is fixed on one side of the lock tongue member 53, and the other end of the connecting member 55 is fixed on the first blocking portion 76, and the first blocking portion 76 and the tilt pull wire 71 are movably cooperated.

[0045] Further preferably, the connecting member 55 is an elastic member, the second blocking portion 54 is a screw threadedly matched with the other end of the sliding rod, and the locking pin is plug-in connected to the locking hole. This is because the movement of the connecting member 55 can drive the lock tongue member 53 to move, but when the lock tongue member 53 is not aligned with the locking portion 73, the movement synchronization between the two is relatively poor. Specifically, when the first blocking portion 76 returns to the initial position, the lock tongue member 53 is in a state of abutting against the lock plate 4, so the two need to be connected through the connecting member 55 to compensate for the position difference during the movement. At the same time, during the rotation of the lock plate 4, the lock tongue member 53 is aligned with the locking portion 73, and then under the action of the connecting member 55, the lock tongue member 53 cooperates with the locking portion 73 to complete the locking of the lock plate 4. As mentioned above, the connecting member 55 should be an elastic member; in this embodiment, the connecting member 55 is a torsion spring. In this embodiment, the locking tongue member 53 is a locking pin, the locking plate 52 is fan-shaped, the locking portion 73 is a locking hole, and a plurality of locking holes are close to one end of the arc-shaped edge of the locking plate 52. The locking pin and the locking hole are plug-in connected.

[0046] Further preferably, the first blocking portion 76 is provided with a first channel through which only the tilt cable 71 passes, and a third blocking portion is fixed to one end of the tilt cable 71; when the tilt cable 71 passes through the first channel, the third blocking portion contacts the first blocking portion 76, thereby preventing the tilt cable 71 from passing through the first blocking portion 76; further preferably, the third blocking portion is a sphere, a cylinder or other shapes.

[0047] In this embodiment, a lifting and locking assembly is also provided, which is located at the rear of the tilt locking assembly 5, including a lifting cable 72 and a second mounting seat 57 installed in the base 1, the second mounting seat 57 is downwardly recessed with a gas rod fixing hole for installing a lifting gas rod, the gas rod fixing hole extends downwardly through the base 1, the top of the second mounting seat 57 protrudes with two supports, a switch shaft is hinged between the supports, a pressure plate 58 is installed on the switch shaft, a switch torsion spring 59 for resetting the pressure plate 58 is arranged between the support and the pressure plate 58, one end of the pressure plate 58 is installed on the switch shaft, and the other end of the pressure plate 58 is movably connected to the lifting cable 72; in this way, pulling the lifting cable 72 drives one end of the pressure plate 58 to move downward, the pressure plate 58 presses down the switch of the gas rod and presses down the switch torsion spring 59 to store force, and the lifting cable 72 is released, the switch torsion spring 59 is released to drive the pressure plate 58 and the lifting cable 72 to reset, and the gas rod switch resets itself.

[0048] Further preferably, the pressing plate 58 is provided with a second passage through which only the lifting wire 72 can pass, and a fourth blocking portion is fixed to one end of the lifting wire 72. When the lifting wire 72 passes through the second passage, the fourth blocking portion contacts the pressing plate 58, thereby preventing the lifting wire 72 from continuing to pass through the pressing plate 58. Further preferably, the third blocking portion is a sphere, a cylinder or other shapes.

[0049] Further preferably, a wire steering sleeve 75 is sleeved on the fourth connecting shaft 64, and the lifting wire 72 starts from the pressing plate 58 and extends forward through the bottom of the wire steering sleeve 75, and the lifting wire 72 extends forward through the base 1 and the bottom simple cover 12; in this solution, the lowest end of the movement stroke of the pressing plate 58 is higher than the lowest end of the wire steering sleeve 75. This arrangement is convenient for users to control the lifting and lowering of the pallet, and the wire steering sleeve 75 makes the lifting wire 72 smooth, avoiding the lifting wire 72 from bending at a small angle at the turning point to affect the service life of the pallet.

[0050] A chair comprises the tray as described above, and further comprises supporting feet mounted on a base 1 , a chair back mounted on a tail seat 3 , and a chair seat mounted on a top seat 3 .

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", 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 present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0052] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A pallet, characterized in that: The invention comprises a base (1) for mounting a chair leg, a top base (2) for mounting a chair seat, and a tail base (3) for mounting a chair back, wherein the top base (2) is provided with a first connecting portion (21) extending downward, and the tail base (3) comprises a second connecting portion (31) extending forward, the base (1) is movably connected to the first connecting portion (21) of the top base (2) via a first connecting shaft (61), the base (1) is hingedly connected to the second connecting portion (31) of the tail base (3) via a fourth connecting shaft (64), and the tail base (3) is hingedly connected to the first connecting portion (21) of the top base (2) via a fifth connecting shaft (65), the first connecting shaft (61) is located behind the fifth connecting shaft (65), the fourth connecting shaft (64) is located between the first connecting shaft (61) and the fifth connecting shaft (65), and the fourth connecting shaft (64) is located below the first connecting shaft (61) and the fifth connecting shaft (65). An elastic reset member (4) is provided between the first connecting shaft (61) and the fifth connecting shaft (65); It also includes a lock plate (52) swingably disposed in the base (1), the fourth connecting shaft (64) passing through the lock plate (52), a third connecting shaft (63) passing through the lock plate (52), two ends of the third connecting shaft (63) being connected to two second connecting parts (31) of the tail stock (3), so as to achieve synchronous movement of the lock plate (52) and the tail stock (3), the third connecting shaft (63) passing through the base (1) and being slidably connected thereto, and the third connecting shaft (63) being located below the first connecting shaft (61) and the fifth connecting shaft (65); It also includes a tilt locking assembly (5) located below the third connecting shaft (63), including a tilt cable (71) and a first mounting seat (51) and a lock tongue mounting seat (56) on the mounting base (1); a spring assembly that can move left and right is mounted on the first mounting seat (51); a lock tongue assembly that can move left and right is mounted on the lock tongue mounting seat (56); a plurality of locking portions (73) are provided on the lock plate; by tightening or loosening the tilt cable, the spring assembly can move left and right on the first mounting seat, thereby driving the lock tongue member (53) to move left and right on the lock tongue mounting seat (56), thereby cooperating with the plurality of locking portions to limit the swing of the lock plate (52), thereby controlling the tilt angle of the tailstock (3) through the third connecting shaft (63); the locking portion (73) is a locking hole, the lock tongue member (53) is a locking pin, and the locking hole and the locking pin are pluggable connected; The first mounting seat (51) is located below the third connecting shaft (63), and the locking tongue mounting seat (56) is located in front of the first mounting seat (51).

2. A pallet according to claim 1, characterized in that: There are two first connection parts (21), there are two second connection parts (31), the base (1) is located between the two second connection parts (31), and the two second connection parts (31) are located between the two first connection parts (21).

3. A pallet according to claim 1, characterized in that: The fourth connecting shaft (64) and the third connecting shaft (63) are located between the first connecting shaft (61) and the fifth connecting shaft (65), and the third connecting shaft (63) is located in front of the fourth connecting shaft (64).

4. A pallet according to claim 1, characterized in that: It also includes a lifting and locking assembly, including a lifting cable (72) and a pressure plate hinged in the base (1), wherein the pressure plate (58) is movably connected to the lifting cable (72); a cable steering sleeve (75) is sleeved on the fourth connecting shaft (64), and the lifting cable (72) starts from the pressure plate (58) and extends forward from below the cable steering sleeve (75).

5. A pallet according to claim 1, characterized in that: The front end of the top seat (2) is fixedly connected to a top simple cover (23), the front end of the base (1) is hingedly connected to a bottom simple cover (12), the top simple cover (23) covers the bottom simple cover (12) and is movably connected to the top simple cover (23), and the top simple cover (23) is movably connected to the bottom simple cover (12).

6. A pallet according to claim 5, characterized in that: The top simple cover (23) is provided with a second connecting shaft (62) protruding therefrom, and the bottom simple cover (12) is provided with a second sliding hole (13), wherein the second connecting shaft (62) is located in the second sliding hole (13).

7. A pallet according to claim 1, characterized in that: The elastic reset member (4) comprises a compression spring (41) and a retractable guide member (42), the two ends of the guide member being rotatably mounted on the first connecting shaft (61) and the fifth connecting shaft (65), respectively, and the compression spring (41) is located between the first connecting shaft (61) and the fifth connecting shaft (65) and is sleeved on the guide member (42).

8. A chair, characterized in that: A tray comprising a tray as claimed in any one of claims 1 to 7.

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