Seat cushion extension structure of an office chair

Abstract

The present invention relates to a seat extension structure for an office chair, and belongs to the technical field of office chairs. It includes a fixed plate and a movable plate connected in a sliding manner, and also includes a control component for controlling the movable plate, the control component includes a pull plate and an intermediate member; the pull plate includes a main body and a hand-pull portion; the intermediate member control portion and an output portion, the main body is provided with a control groove, and the control portion extends upward from the control groove; the main body is provided with an oblique straight groove, and the control portion is arranged in the straight groove and connected to the straight groove; the fixed plate is provided with an accommodation groove for accommodating the control portion and allowing it to move horizontally and vertically, and at least one side of the accommodation groove is provided with a multi-stage gear corresponding to the output portion. The present invention adopts a sliding guide component to adjust the movable plate based on the movement of the fixed plate, so that the movable plate has the advantage of being smooth and stable when adjusted.

Description

Technical Field

[0001] The invention relates to a seat cushion extension structure of an office chair, belonging to the technical field of office chairs. Background Art

[0002] In the prior art, chairs with a cushion extension structure are mostly used in automobiles. For example, the Chinese invention patent with application number 201510824119.5 discloses a cushion extension device, including: a sliding track, which is arranged on the lower side of the cushion frame; an extension plate, which is connected to the front end of the sliding track and arranged on the front side of the cushion frame; an extension motor, which has a lead screw, and the extension motor is arranged on the lower side of the cushion frame; a first hinge bracket, which is connected to the end of the sliding track and arranged on the upper rear side of the extension plate; and a second hinge bracket, which is connected to the end of the lead screw and arranged on the lower rear side of the extension plate; wherein the extension plate is configured to slide forward along the sliding track and extend forward while rotating in the upper front by actuation of the lead screw driven by the extension motor. This structure is relatively complex and requires motor drive. In the technical field of office chairs, there are currently few reports on chairs with a cushion extension structure. A chair with this function can not only adjust the sitting comfort, but also make the same office chair adaptable to people of different body shapes. Summary of the invention

[0003] The present invention aims to solve the above-mentioned problem, thereby providing a seat cushion extension structure for an office chair.

[0004] The technical solution of the present invention to solve the above problems is as follows:

[0005] A seat extension structure for an office chair, comprising a movable plate for installing a seat cushion and a fixed plate connected to a chair frame, wherein the movable plate and the fixed plate are slidably connected, and the seat extension structure also comprises a control component arranged between the movable plate and the fixed plate for controlling the movable plate, wherein the control component comprises a pull plate and an intermediate member connected to the pull plate in cooperation with the pull plate; the pull plate comprises a main body and a hand-pull part; the intermediate member comprises a vertically arranged control part and a horizontally arranged output part, the main body of the movable plate is provided with a control groove for accommodating the control part and allowing it to move laterally, and the control part extends upward out of the control groove; the main body of the pull plate is provided with an oblique straight groove, the control part is arranged in the straight groove and is connected to the straight groove in cooperation with the straight groove; the fixed plate is provided with a placement groove for accommodating the control part and allowing it to move laterally and longitudinally, and at least one side of the placement groove is provided with a multi-stage gear corresponding to the output part.

[0006] Preferably, the movable plate and the fixed plate are slidably connected via a sliding guide assembly, the sliding guide assembly comprising two fixed guide blocks which are arranged on the fixed plate and protrude from the fixed plate, and two guide grooves which are arranged on the movable plate and formed by hollowing out and correspond to the two fixed guide blocks; the guide grooves are longitudinally arranged.

[0007] Preferably, both ends of the guide groove form limiting constraints on the fixed guide block.

[0008] Preferably, a mounting groove for setting the control component is formed on the middle upper surface of the movable plate, and the mounting groove is adapted to the main body of the pull plate.

[0009] Preferably, the control component also includes a limiting structure, which includes a limiting cover plate fixed to the movable plate, and the limiting cover plate is provided with a limiting block arranged downwardly; the main body of the pull plate is provided with a gap, and the gap corresponds to the limiting block; and the limiting block forms a limiting constraint on both ends of the gap.

[0010] Preferably, a limiting groove is further provided at the bottom of the installation groove; the free end of the limiting block is accommodated in the limiting groove.

[0011] Preferably, a middle front end of the movable plate is formed with an insertion opening for inserting the pull plate.

[0012] Preferably, the two fixed guide blocks and two guide grooves of the sliding guide assembly are arranged on both sides of the control assembly.

[0013] Preferably, the straight groove is arranged close to an end away from the hand-pull portion.

[0014] Preferably, the sliding guide assembly further comprises a guide ridge arranged on the fixed plate and a guide groove arranged at the bottom of the movable plate, wherein the inner end of the guide groove is an unsealed U-shaped structure; the guide ridge is cooperatively connected with the guide groove.

[0015] In summary, the present invention has the following beneficial effects:

[0016] 1. The present invention controls the locking state of the movable plate by cooperating with an oblique slot and a control part: when the pull plate is pulled toward the front end (with a normal sitting posture as a reference), due to the effect of the oblique slot, it controls the control part to withdraw the output part from the multi-stage gear position of the placement groove, thereby realizing the unlocking between the movable plate and the fixed plate, and the movable plate can be freely adjusted at this time; when the pull plate is pushed toward the rear end, due to the effect of the oblique slot, it controls the control part to place the output part into the multi-stage gear position of the placement groove, thereby realizing the locking between the movable plate and the fixed plate, and the movable plate cannot move relative to the fixed plate.

[0017] 2. The present invention adopts a sliding guide assembly to adjust the movable plate based on the movement of the fixed plate, so that the movable plate has the advantage of being stable and smooth during adjustment;

[0018] 3. The present invention also uses a limit cover plate to control the expansion and contraction amount of the pull plate during adjustment, effectively avoiding the occurrence of stretching transition;

[0019] 4. The placement groove of the present invention is provided with multiple gears, which can realize the locking of the movable plate relative to the fixed plate at multiple different positions, making the present invention suitable for people of different body shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 yes Figure 1 A top view of

[0022] Figure 3 yes Figure 1 The view after removing the limit cover;

[0023] Figure 4 yes Figure 3 The view after the pull plate is removed;

[0024] Figure 5 yes Figure 4 The view after the movable panel is removed;

[0025] Figure 6 yes Figure 3 Stereoscopic image of

[0026] Figure 7 yes Figure 4 Stereoscopic image of

[0027] Figure 8 yes Figure 5 Stereoscopic image of

[0028] In the figure, 1-fixed plate, 2-movable plate, 3-control assembly, 4-sliding guide assembly;

[0029] 2.1-control slot, 2.2-installation slot, 2.3-limiting slot, 2.4-entry port;

[0030] 31-pull plate, 32-intermediary piece, 33-limiting cover plate;

[0031] 31.1-slot, 32.1-control part, 32.2-output part, 33.1-limit block;

[0032] 4.1-Fixed guide block, 4.2-Guide groove. DETAILED DESCRIPTION

[0033] The present invention is further explained below in conjunction with the accompanying drawings.

[0034] This specific implementation is only an explanation of the present invention, not a limitation of the present invention. Any changes made by those skilled in the art after reading the specification of the present invention will be protected by the patent law as long as they are within the scope of the claims.

[0035] A seat cushion extension structure for an office chair, such as Figure 1 As shown, it includes a movable plate 2 for installing a seat cushion and a fixed plate 1 connected to a chair frame, wherein the movable plate 2 and the fixed plate 1 are slidably connected. The seat cushion extension structure also includes a control component 3 disposed between the movable plate 2 and the fixed plate 1 for controlling the movable plate 2.

[0036] like Figure 3 and 6 As shown, a mounting groove 2.2 for mounting the control assembly 3 is formed on the middle upper surface of the movable plate 2, and the mounting groove 2.2 is matched with the main body of the pulling plate 31.

[0037] The control assembly 3 includes a pull plate 31 and an intermediate member 32 connected to the pull plate; the pull plate 31 includes a main body and a hand-pull portion.

[0038] like Figure 5 and 8 As shown, the intermediate component 32 includes a vertically arranged control portion 32.1 and a horizontally arranged output portion 32.2.

[0039] like Figure 4 and 7 As shown, the front end of the middle of the movable plate 2 is formed with an insertion port 2.4 for inserting the pull plate 31. The main body of the movable plate 2 is provided with a control slot 2.1 for accommodating the control part 32.1 and allowing it to move laterally, and the control part 32.1 extends upward out of the control slot 2.1.

[0040] like Figure 3 and 6As shown, the main body of the pull plate 31 is provided with an oblique straight groove 31.1, and the control part 32.1 is arranged in the straight groove 31.1 and is matched and connected with the straight groove 31.1. The straight groove 31.1 is arranged close to the end away from the hand-pull part.

[0041] like Figure 5 and 8 As shown, the fixing plate 1 is provided with a placement groove 1.1 for accommodating the control part 32.1 and allowing it to move in the horizontal and vertical directions, and at least one side of the placement groove is provided with a multi-stage gear 1.1.1 corresponding to the output part 32.2.

[0042] like Figure 1-2 As shown, the control assembly 3 further comprises a limiting structure, and the limiting structure comprises a limiting cover plate 33 fixed to the movable plate 2, and the limiting cover plate 33 is provided with a limiting block 33.1 arranged downward.

[0043] like Figure 3 and 6 As shown, the main body of the pull plate 31 is provided with a gap, and the gap corresponds to the limit block 33.1; and the limit block 33.1 forms limit constraints on both ends of the gap.

[0044] like Figure 4 and 7 As shown, a limiting groove 2.3 is further provided at the bottom of the installation groove 2.2; the free end of the limiting block 33.1 is accommodated in the limiting groove 2.3.

[0045] The movable plate 2 and the fixed plate 1 are connected by sliding fit through a sliding guide assembly 4. Figure 1-2 As shown, the sliding guide assembly 4 includes two fixed guide blocks 4.1 provided on the fixed plate 1 and protruding from the fixed plate 1, and two guide grooves 4.2 provided on the movable plate 2 and corresponding to the two fixed guide blocks 4.1 and formed by hollowing out; the guide grooves 4.2 are provided longitudinally. The two ends of the guide grooves 4.2 form limiting constraints on the fixed guide blocks 4.1. The two fixed guide blocks 4.1 and the two guide grooves 4.2 of the sliding guide assembly 4 are provided on both sides of the control assembly 3. The sliding guide assembly 4 also includes a guide ridge provided on the fixed plate 1 and a guide groove provided at the bottom of the movable plate 2, the inner end of the guide groove being an unsealed U-shaped structure; the guide ridge is cooperatively connected with the guide groove.

[0046] When the present invention is in use, if it is necessary to adjust the extension amount of the seat cushion, the pull plate is pulled outward so that the inclined straight groove acts as the control part, driving the output part to withdraw from the multi-stage gear position. At this time, the movable plate can arbitrarily adjust the extension amount relative to the fixed plate; if the extension amount is adjusted to the right position, the pull plate is pushed inward, so that the inclined straight groove acts as the control part, driving the output part to be placed in the multi-stage gear position. At this time, the movable plate is fixed relative to the fixed plate, the movable plate cannot be adjusted, and the seat cushion is fixedly connected to the movable plate, so the seat cushion is also fixed, that is, the extension amount of the seat cushion is adjusted.

Claims

1. A seat cushion extension structure for an office chair, comprising a movable plate (2) for mounting the seat cushion and a fixed plate (1) connected to a chair frame, wherein the movable plate (2) and the fixed plate (1) are connected in a sliding manner, and characterized in that: The seat extension structure further comprises a control component (3) arranged between the movable plate (2) and the fixed plate (1) and used for controlling the movable plate (2); the control component (3) comprises a pull plate (31) and an intermediate member (32) connected to the pull plate; the pull plate (31) comprises a main body and a hand-pull part; the intermediate member (32) comprises a vertically arranged control part (32.1) and a horizontally arranged output part (32.2); the main body of the movable plate (2) is provided with a control groove (2.1) for accommodating the control part (32.1) and allowing it to move laterally; The control portion (32.1) extends upwardly out of the control groove (2.1); the main body of the pull plate (31) is provided with an oblique straight groove (31.1), and the control portion (32.1) is arranged in the straight groove (31.1) and is connected to the straight groove (31.1); the fixed plate (1) is provided with a placement groove (1.1) for accommodating the control portion (32.1) and allowing it to move horizontally and vertically, and at least one side of the placement groove is provided with a multi-stage gear (1.1.1) corresponding to the output portion (32.2).

2. The seat cushion extension structure of an office chair according to claim 1, characterized in that: The movable plate (2) and the fixed plate (1) are slidably connected via a sliding guide assembly, wherein the sliding guide assembly comprises two fixed guide blocks (4.1) arranged on the fixed plate (1) and protruding from the fixed plate (1), and two guide grooves (4.2) arranged on the movable plate (2) and formed by hollowing out and corresponding to the two fixed guide blocks (4.1); the guide grooves (4.2) are arranged longitudinally.

3. The seat cushion extension structure of an office chair according to claim 2, characterized in that: The two ends of the guide groove (4.2) form limiting constraints on the fixed guide block (4.1).

4. The seat cushion extension structure of an office chair according to claim 1, characterized in that: A mounting groove (2.2) for mounting the control component (3) is formed on the middle upper surface of the movable plate (2), and the mounting groove (2.2) is adapted to the main body of the pull plate (31).

5. The seat cushion extension structure of an office chair according to claim 4, characterized in that: The control assembly (3) further comprises a limiting structure, the limiting structure comprising a limiting cover plate (33) fixed to the movable plate (2), the limiting cover plate (33) being provided with a limiting block (33.1) arranged downwardly; a main body of the pull plate (31) being provided with a gap, the gap corresponding to the limiting block (33.1); and the limiting block (33.1) forming limiting constraints on both ends of the gap.

6. The seat cushion extension structure of an office chair according to claim 5, characterized in that: A limiting groove (2.3) is also provided at the bottom of the installation groove (2.2); the free end of the limiting block (33.1) is accommodated in the limiting groove (2.3).

7. The seat cushion extension structure of an office chair according to claim 1, characterized in that: The front end of the middle portion of the movable plate (2) is formed with an insertion opening (2.4) for inserting the pulling plate (31).

8. The seat cushion extension structure of an office chair according to claim 2, characterized in that: The two fixed guide blocks (4.1) and the two guide grooves (4.2) of the sliding guide assembly are arranged on both sides of the control assembly (3).

9. The seat cushion extension structure of an office chair according to claim 1, characterized in that: The slot (31.1) is arranged close to an end away from the hand-pull portion.

10. The seat cushion extension structure of an office chair according to claim 2, characterized in that: The sliding guide assembly further comprises a guide convex strip arranged on the fixed plate (1) and a guide groove arranged at the bottom of the movable plate (2); the inner end of the guide groove is an unsealed U-shaped structure; the guide convex strip is cooperatively connected with the guide groove.

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