Seat tray structure and office chair

Abstract

The present invention provides a chair tray structure and an office chair, comprising a base, a large plate, a flap, and a support seat. A third pin is fixed to one end of the support seat away from the large plate, and a movable hole for the third pin to pass through is provided on the flap, and the inner wall of the movable hole is spaced apart from the outer wall of the third pin; an adjustment seat is fixed to the bottom of the support seat, and at least two gear slots are provided on the side of the adjustment seat close to the base. An adjustment rod is rotatably connected to the base, and the adjustment rod is connected to a locking plate through a connecting mechanism. The middle part of the locking plate is rotatably installed on the base, and the connecting mechanism includes an adjustment block fixed to the adjustment rod, and a retractable elastic force storage member connected to the adjustment block at one end and the locking plate at the other end. The elastic force storage member is retracted in a direction along the line connecting its two end points. A positioning protrusion is fixed to the adjustment block, and an elastic limit seat is installed on the base below the adjustment block. This solution replaces the original two small compression springs with an elastic force storage member, and the structure is simpler and easy to install.

Description

Technical Field

[0001] The invention relates to the field of pneumatic seats, in particular to a seat tray structure and an office seat. Background Art

[0002] The seat tray is the core component of the office chair, which can complete functions such as adjusting the tilt angle of the backrest to meet the user's comfort requirements.

[0003] The structure of the seat tray is similar to the gear locking device for a swivel chair tray disclosed in the announcement number CN208463367U, including a tray body, the tray body is connected to a seesaw through connecting screws, a base is connected to the middle of the tray body, a support seat and a rack are fixed on the base, a gear locking rod is connected to the tray body, the gear locking rod is connected to a gear adjustment block, a connecting pin is connected to the gear adjustment block, a small compression spring is connected to the connecting pin, and a locking piece that can be inserted into the rack is connected to the connecting pin through a connecting mechanism. The disclosed gear locking device for a swivel chair tray has a rebound protection function after the small compression spring is set. In the locked state, when the gear locking rod is pulled back, the locking piece will not be separated from the rack immediately, and an external force is required to act on the seesaw to release it. The small compression springs are respectively set on both sides of the gear adjustment block.

[0004] In this method, two sections of small compression springs are provided, which are connected to the adjustment block by pins, and the structure is complex. It has high requirements on the installation and matching accuracy of the small compression springs and is difficult to assemble. In addition, since the elastic forces generated by the small compression springs at both ends will partially offset each other, the elastic force requirements of the two sections of small compression springs are higher. In order to limit the position of the small compression spring, the end of the pin close to the pull rod needs to be flattened, which has high precision requirements, is difficult to guarantee the size, and has high processing costs. Summary of the invention

[0005] In view of the shortcomings of the prior art, a first object of the present invention is to provide a seat tray structure whose adjustment device has a simpler structure.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a seat tray structure, comprising a base, a large plate rotatably mounted in the middle of the base through a first pin, a flap rotatably connected to one end of the base through a second pin, and a support seat fixed below the large plate, a third pin being fixed to one end of the support seat away from the large plate, a movable hole for the third pin to pass through is provided on the flap, and the inner wall of the movable hole is spaced from the outer wall of the third pin; an adjustment seat is fixed at the bottom of the support seat, at least two gear slots are provided on the side of the adjustment seat close to the base, an adjustment rod is rotatably connected to the base, the adjustment rod is connected to a locking plate that can be inserted into or out of the gear slot through a connecting mechanism, the middle part of the locking plate is rotatably mounted on the base, the connecting mechanism comprises an adjustment block fixed to the adjustment rod, a retractable elastic force storage member connected to the adjustment block at one end and connected to the locking plate at the other end, the retractable direction of the elastic force storage member is along the line connecting its two end points, a positioning protrusion is fixed on the adjustment block, and an elastic limit seat is installed below the adjustment block on the base to prevent the positioning protrusion from rotating with the adjustment block.

[0007] This solution replaces the original two small compression springs with an elastic force storage member, changes the position of the elastic force storage member, and omits the original pull rod and pin structure, making the structure simpler; and since there is no elastic force offset between the two small compression springs, the installation accuracy requirements are reduced.

[0008] It is further provided that a first connecting hole is provided on the adjusting block, a second connecting hole is provided on the locking plate, and hooks are formed at both ends of the elastic force storage member and are respectively hooked in the first connecting hole and the second connecting hole.

[0009] The installation of the elastic force storage member can be quickly completed by hooking the elastic force storage member into the first connecting hole and the second connecting hole, and the installation is convenient.

[0010] It is further arranged that the elastic force storage member is a serpentine spring or a spiral telescopic spring that bends back and forth in the same plane.

[0011] The elastic force storage member can be in various forms, and the above are two specific forms.

[0012] It is further configured that a sleeve is fixed on the base, the locking plate is sleeved on the sleeve and rotates relative to the sleeve, a limit plate is arranged on the sleeve, a bolt passes through the sleeve, the bolt simultaneously passes through the limit plate connection nut, the lower surface of the limit plate abuts against the upper surface of the sleeve, and a gap is arranged between the lower surface of the limit plate and the upper surface of the locking plate.

[0013] The locking plate rotates around the sleeve, and the limit plate is used to limit the axial movement of the locking plate relative to the sleeve. A gap is set between the lower surface of the limit plate and the upper surface of the locking plate. The gap is very small, mainly to facilitate the rotation of the locking plate and reduce friction.

[0014] It is further provided that the elastic limiting seat is an annular structure and forms an inverted V-shaped protrusion on a side away from the base.

[0015] The middle of the annular structure is hollow, which facilitates the deformation of the elastic limit seat.

[0016] It is further provided that a limiting protrusion is fixed on the side wall of the adjusting rod, and a limiting groove corresponding to the limiting protrusion is provided in the adjusting block.

[0017] Through the cooperation of the limiting protrusion and the limiting groove, when the adjusting rod rotates, the adjusting block rotates synchronously with the adjusting rod.

[0018] It is further provided that the adjustment seat is composed of a plurality of adjustment plates with the same structure.

[0019] Through the single-piece assembly method, the number of pieces can be controlled according to needs, which makes it more adaptable.

[0020] It is further provided that the outer side surface of the positioning protrusion has an arc transition.

[0021] The outer side surface of the positioning protrusion is set to be an arc transition, and the arc has a guiding function to facilitate the rotation of the positioning protrusion.

[0022] A second object of the present invention is to provide an office chair comprising the above-mentioned seat tray structure.

[0023] In summary, the present invention has the following beneficial effects: an elastic force storage piece is used instead, the position of the elastic force storage piece is changed, and the original pull rod and pin structure are omitted, so the structure is simpler; and because there is no elastic force offset generated between the two small compression springs, the installation accuracy requirement is reduced; the connection between the elastic force storage piece and the locking plate and the adjustment block is completed by a hook connection at both ends, which makes assembly simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of Example 1;

[0025] Figure 2 This is a schematic diagram of the structure after the large disk is hidden in Example 1;

[0026] Figure 3 yes Figure 2 Schematic diagram of the structure after the adjustment rod and the limit plate are hidden;

[0027] Figure 4 It is a schematic diagram of the coordination between the adjusting rod, the adjusting block and the elastic limit seat;

[0028] Figure 5 It is a schematic diagram of the structure of the adjusting rod;

[0029] Figure 6 It is a structural diagram of the adjustment block.

[0030] Figure numerals: 11, base; 12, flip cover; 13, large plate; 14, sleeve; 21, first pin; 22, second pin; 23, third pin; 31, movable hole; 4, adjustment seat; 41, gear slot; 5, adjustment rod; 51, limiting protrusion; 6, adjustment block; 61, protrusion mounting portion; 611, first connecting hole; 62, limiting slot; 7, locking plate; 71, second connecting hole; 81, limiting plate; 82, bolt; 83, nut; 91, elastic force storage member; 92, positioning protrusion; 93, elastic limiting seat; 931, V-shaped protrusion. DETAILED DESCRIPTION

[0031] The invention is further described in detail below with reference to the accompanying drawings.

[0032] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0033] Embodiment 1 A seat tray structure, such as Figure 1-6 , comprising a base 11, a large plate 13 rotatably mounted in the middle of the base 11 through a first pin 21, a flip cover 12 rotatably connected to one end of the base 11 through a second pin 22, and a support base fixed below the large plate 13. The support base is an inverted U-shaped structure, and a third pin 23 is fixed to one end of the support base away from the large plate 13. A movable hole 31 for the third pin 23 to pass through is provided on the flip cover 12. The movable hole 31 is a waist-shaped hole, and the minimum inner diameter of the waist-shaped hole is larger than the diameter of the third pin 23. In this way, the inner wall of the movable hole 31 and the outer wall of the third pin 23 form a gap, so that the third pin 23 can rotate and move horizontally or vertically in the movable hole 31.

[0034] An adjustment seat 4 is fixed at the bottom of the support seat, and the adjustment seat 4 is composed of a plurality of adjustment plates with the same structure. The adjustment seat 4 has at least two gear slots 41 on one side close to the base 11, and a groove on the other side. In this embodiment, four gear slots 41 are provided, and four gear adjustments can be performed. An adjustment rod 5 is inserted into the base 11, and the adjustment rod 5 can rotate relative to the base 11.

[0035] The adjusting rod 5 is connected to a locking plate 7 that can be inserted into or out of the gear slot 41 through a connecting mechanism. The locking plate 7 is roughly L-shaped. Two sleeves 14 are fixed on the base 11. The locking plate 7 is sleeved on the sleeve 14 on the same side as the adjusting rod 5 and rotates relative to the sleeve 14. A limit plate 81 is set on the sleeve 14. A bolt 82 passes through the sleeve 14. The bolt 82 passes through the limit plate 81 from the bottom of the base 11 to connect the nut 83. The lower surface of the limit plate 81 abuts against the upper surface of the sleeve 14. A gap is set between the lower surface of the limit plate 81 and the upper surface of the locking plate 7. The gap is small, ranging from 0.1 to 0.5 mm.

[0036] The connecting mechanism includes an adjusting block 6 fixed to the adjusting rod 5, and a retractable elastic force storage member 91 connected to the adjusting block 6 at one end and connected to the locking plate 7 at the other end. The adjusting block 6 is an annular structure with a raised mounting portion 61, which rotates synchronously in the circumferential direction with the limiting protrusion 51 on the adjusting rod 5 through the limiting groove 62 on the inner wall. A first connecting hole 611 is provided on the raised mounting portion 61, and a second connecting hole 71 is provided on the side of the locking plate 7 close to the adjusting block 6. In this embodiment, the elastic force storage member 91 is a serpentine spring that bends back and forth in the same plane, and hooks are formed at both ends to be hooked in the first connecting hole 611 and the second connecting hole 71 respectively. Of course, the elastic force storage member 91 can also be other retractable elastic members, such as a spiral telescopic spring.

[0037] The adjusting block 6 is fixed with positioning protrusions 92. In this embodiment, three positioning protrusions 92 are provided, and the outer side surfaces of two positioning protrusions 92 are arc transitioned. The base 11 is located below the adjusting block 6 and is provided with an elastic limiting seat 93 that prevents the positioning protrusion 92 from rotating with the adjusting block 6. The elastic limiting seat 93 is an annular structure and forms an inverted V-shaped protrusion 931 on the side away from the base 11. In this embodiment, the elastic limiting seat 93 is made of plastic, and it can also be made of elastic steel.

[0038] Principle: During adjustment, rotate the adjusting rod 5 clockwise until the positioning protrusion 92 abuts against the left side of the V-shaped protrusion 931 (the side away from the locking plate 7). During this process, the elastic force storage member 91 is compressed and stores force, and then actively applies a force to the flip cover 12 (seat back) to make the locking plate 7 disengage from the gear slot 41, and the gear adjustment can be performed at this time; conversely, rotate the adjusting rod 5 counterclockwise until the positioning protrusion 92 abuts against the right side of the V-shaped protrusion 931. During this process, the elastic force storage member 91 is stretched and stores force, and then actively applies a force to the flip cover 12 (seat back) to make the locking plate 7 enter the gear slot 41 for locking.

[0039] Embodiment 2 An office chair includes embodiment 1.

Claims

1. A seat tray structure, comprising a base (11), a large plate (13) rotatably mounted in the middle of the base (11) via a first pin (21), a flip cover (12) rotatably connected to one end of the base (11) via a second pin (22), and a support base fixed below the large plate (13), wherein a third pin (23) is fixed to one end of the support base away from the large plate (13), and a movable hole (31) is provided on the flip cover (12) for the third pin (23) to pass through, wherein the movable hole (31) is provided on the flip cover (12) and ... The inner wall of the movable hole (31) and the outer wall of the third pin (23) are arranged at intervals; an adjustment seat (4) is fixed at the bottom of the support seat, and at least two gear slots (41) are provided on the side of the adjustment seat (4) close to the base (11); an adjustment rod (5) is rotatably connected to the base (11); the adjustment rod (5) is connected to a locking plate (7) that can be inserted into or separated from the gear slot (41) through a connecting mechanism; the middle part of the locking plate (7) is rotatably mounted on the base (11), and is characterized in that: The connecting mechanism comprises an adjusting block (6) fixed to the adjusting rod (5), a retractable elastic force storage member (91) connected at one end to the adjusting block (6) and at the other end to the locking plate (7), wherein the retractable direction of the elastic force storage member (91) is along the line connecting its two end points, a positioning protrusion (92) is fixed to the adjusting block (6), an elastic limiting seat (93) is installed below the adjusting block (6) to prevent the positioning protrusion (92) from rotating with the adjusting block (6), and a slot is opened on the adjusting block (6). A first connection hole (611) is provided, a second connection hole (71) is provided on the locking plate (7), hooks are formed at both ends of the elastic force storage member (91) and are respectively hooked in the first connection hole (611) and the second connection hole (71), the elastic limit seat (93) is an annular structure and forms an inverted V-shaped protrusion (931) on the side away from the base (11), a limit protrusion (51) is fixed on the side wall of the adjustment rod (5), and a limit groove (62) corresponding to the limit protrusion (51) is provided in the adjustment block (6).

2. The seat tray structure according to claim 1, characterized in that: The elastic force storage member (91) is a serpentine spring or a spiral telescopic spring that bends back and forth in the same plane.

3. The seat tray structure according to claim 1, characterized in that: A sleeve (14) is fixed on the base (11), the locking plate (7) is sleeved on the sleeve (14) and rotates relative to the sleeve (14), a limiting plate (81) is arranged on the sleeve (14), a bolt (82) passes through the sleeve (14), the bolt (82) passes through the limiting plate (81) and connects with a nut (83), the lower surface of the limiting plate (81) abuts against the upper surface of the sleeve (14), and a gap is arranged between the lower surface of the limiting plate (81) and the upper surface of the locking plate (7).

4. The seat tray structure according to claim 1, characterized in that: The adjustment seat (4) is composed of a plurality of adjustment sheets with the same structure.

5. The seat tray structure according to claim 1, characterized in that: The outer side surface of the positioning protrusion (92) is in a circular arc transition.

6. An office chair, characterized in that: It comprises a seat tray structure as described in any one of claims 1 to 5.

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