A modular office chair base

Abstract

The present invention discloses a combined office chair base, including a center frame, a connecting frame with a mounting groove in the middle part is circumferentially arranged on the side wall of the center frame, a positioning hole 1 connected to the mounting groove is arranged on the side wall of each connecting frame, a supporting foot is arranged on each connecting frame, a mounting hole for inserting the connecting frame is arranged in the middle part of the supporting foot, a positioning hole 2 connected to the mounting hole and used to align with the positioning hole 1 is arranged on the side wall of the supporting foot, a spring sheet buckle is arranged in the mounting groove, the spring sheet buckle includes a V-shaped spring sheet capable of bending and deformation, a protrusion arranged on the V-shaped spring sheet and used to pass through the positioning hole 1 and the positioning hole 2 in sequence, and a deformation gap is arranged in the middle part of the protrusion. The technical solution of the present invention is to solve the problem that the base in the prior art occupies a large space and is inconvenient to store by arranging a detachably connected connecting frame and supporting foot.

Description

Technical Field

[0001] The invention relates to the technical field of chairs, in particular to a combined office chair base. Background Art

[0002] Office chairs refer to various chairs equipped for the convenience of work in daily life and social activities. In a broad sense, office chairs include all chairs used in offices, such as executive chairs, mid-shift chairs, meeting chairs, staff chairs, conference chairs, visitor chairs, training chairs, etc. In a narrow sense, office chairs refer to chairs with backrests that people sit on when doing desk work in a sitting position.

[0003] The existing Chinese patent with authorization announcement number CN205285669U discloses an office chair, including a seat, a backrest, a base, and a gas column. The backrest is installed on the rear side of the seat, and the base is installed under the seat through the gas column.

[0004] The above-mentioned prior art solutions have the following defects: with the rise of e-commerce, people often buy office chairs online. Sellers usually disassemble the office chairs into components such as seats, backrests, bases, gas columns, etc. and send them to users, who then assemble them by themselves. The base of the office chair occupies a large space, which is inconvenient for storage and transportation, increasing transportation costs. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] The problem to be solved by the present invention is to provide a combined office chair base in view of the above-mentioned deficiencies existing in the prior art, which solves the problem that the base in the prior art occupies a large space and is inconvenient to store by providing a detachably connected connecting frame and supporting feet.

[0007] (II) Technical solution

[0008] The above-mentioned inventive object of the present invention is achieved through the following technical scheme: a combined office chair base, including a center frame, a connecting frame with a mounting groove in the middle of which is circumferentially arranged on the side wall of the center frame, each of the side walls of the connecting frame is provided with a positioning hole 1 connected to the mounting groove, each of the connecting frames is provided with a supporting foot, the middle of the supporting foot is provided with a mounting hole for inserting the connecting frame, the side wall of the supporting foot is provided with a positioning hole 2 connected to the mounting hole and used to align with the positioning hole 1, a spring sheet buckle is provided in the mounting groove, the spring sheet buckle includes a V-shaped spring sheet that can be bent and deformed, and a protrusion arranged on the V-shaped spring sheet and used to pass through the positioning hole 1 and the positioning hole 2 in sequence, and a deformation gap is provided in the middle of the protrusion.

[0009] The present invention is further configured as follows: a socket connected to the mounting hole is provided on the side wall of the supporting foot away from the connecting frame, a universal wheel device is detachably installed on one end of the supporting foot away from the connecting frame, the universal wheel device includes a fixing frame plugged into and matched with the mounting hole, a groove is provided on the bottom surface of the fixing frame, a plurality of guide holes connected to the groove are provided on the side wall of the fixing frame, a plug column for plugging and matching with the socket is slidably provided in each of the guide holes, and a control column mechanism for controlling the reciprocating motion of the plug column in the guide hole is provided in the groove.

[0010] The present invention is further configured as follows: an articulated frame is provided at one end of each of the columns close to the groove, a hinge groove 1 is provided on the end surface of the articulated frame facing the groove, a hinge shaft 1 is provided in the articulated groove 1, the column control mechanism includes a turntable rotatably arranged at the center of the groove and a plurality of connecting rods, a hinge groove 2 is provided on the side wall of the turntable, a hinge shaft 2 is provided in the articulated groove 2 corresponding to each column, one end of each of the connecting rods is hinged to the articulated frame through the articulated shaft 1, and the other end is hinged to the turntable through the articulated shaft 2, and a first wheel frame is coaxially provided at the bottom of the turntable to rotate with the groove and a first universal wheel is mounted on the bottom.

[0011] The present invention is further configured as follows: a positioning groove is provided on the inner wall of the fixing frame, and a positioning ring is provided on the side wall of the first wheel frame, which is embedded in the positioning groove and forms a rotational fit therewith.

[0012] The present invention is further configured as follows: a clamping hole 1 connected to the positioning groove is provided on the outer wall of the fixing frame, a clamping groove 1 aligned with the clamping hole 1 is provided on the side wall of the positioning ring, a return spring 1 is provided on the bottom wall of the clamping groove 1, and a clamping block 1 that is engaged with the clamping hole 1 is provided at one end of the return spring 1 away from the bottom wall of the clamping groove 1.

[0013] The present invention is further configured as follows: the column control mechanism includes a rotating shaft rotatably arranged at the center of the groove, a cam coaxially arranged on the rotating shaft, the outer contour of the cam is a plurality of raised arc surfaces and recessed arc surfaces alternately arranged, the plug column is provided with an elastic member for driving the end of the plug column close to the cam to fit into the outer contour of the cam, thereby making the plug column reciprocate in the guide hole under the drive of the cam, and the bottom of the rotating shaft is coaxially provided with a second wheel frame rotatably matched with the groove and with a second universal wheel installed on the bottom surface.

[0014] The present invention is further configured as follows: a plurality of spring grooves connected to the guide holes are opened on the inner wall of the fixing frame, a force disk slidingly matched with the spring grooves is provided on the plug column, and the elastic member is a column control spring which is sleeved on the plug column and connected to the bottom wall of the spring groove at one end and connected to the force disk at the other end.

[0015] The present invention is further configured as follows: a positioning groove is provided on the outer contour of the cam, a wheel mounting groove is provided on the end of each of the plug posts facing the cam, and a positioning roller is provided in each of the wheel mounting grooves for rolling cooperation with the bottom wall of the positioning groove.

[0016] The present invention is further configured as follows: a second latching hole connected to the groove is provided on the outer wall of the fixing frame, a second latching slot aligned with the second latching hole is provided on the side wall of the second wheel frame, a second return spring is connected to the bottom wall of the second latching slot, and a second latching block engaged with the second latching hole is provided at one end of the second return spring away from the bottom wall of the second latching slot.

[0017] (III) Beneficial effects

[0018] In summary, the beneficial effects of the present invention compared with the prior art are as follows:

[0019] 1. When installing the base of the modular office chair, the user presses the two protrusions to move downward and enter the first positioning hole, then puts one end of the support foot on the connecting frame, and aligns the first positioning hole with the second positioning hole. The two protrusions move upward under the resetting action of the V-shaped spring piece and insert into the second positioning hole, so that the connecting frame and the support foot are connected together. The base of the modular office chair is easy to disassemble and assemble, occupies less space, and is convenient for storage and transportation;

[0020] 2. During installation, the user inserts the fixing frame into the end of the mounting hole away from the connecting frame, and aligns the four guide holes with the four insertion holes, and then rotates the first universal wheel, so that the first wheel frame and the turntable rotate accordingly, and then the plug column extends outward and passes through the insertion hole under the push of the connecting rod; at the same time, the card slot 1 and the card hole 1 are aligned, and the reset spring 1 is reset to push the card block 1 to insert into the card hole 1, so that the rotation of the shaft, the first wheel frame, and the first universal wheel are restricted, and the plug column remains in the state of passing through the insertion hole. At this time, the universal wheel device can be detachably installed on the supporting foot, and the universal wheel device is relatively convenient to disassemble and assemble;

[0021] 3. During installation, the user inserts the fixing frame into the end of the mounting hole away from the connecting frame, and aligns the four guide holes with the four insertion holes, and then rotates the second universal wheel, the second wheel frame, the rotating shaft, and the cam rotate accordingly, until the end of the plug post toward the cam moves from the lowest point of the cam depression to the highest point of the protrusion, and the plug post extends outward and passes through the insertion hole under the push of the cam. At the same time, the second card slot is aligned with the second card hole, the second reset spring is reset, and then the second card block moves away from the second reset spring until the second card block is inserted into the second card hole. The second universal wheel, the second wheel frame, the rotating shaft, and the cam are restricted from rotating, and the plug post remains in a state of passing through the insertion hole. At this time, the universal wheel device can be detachably installed on the supporting foot, and the universal wheel device is relatively convenient to disassemble and assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1is a schematic structural diagram of the base of the modular office chair in the first embodiment;

[0023] Figure 2 is a partial cutaway schematic diagram of the base of the modular office chair in the first embodiment;

[0024] Figure 3 is a schematic diagram of the structure of the spring sheet buckle in the first embodiment;

[0025] Figure 4 is a schematic structural diagram of the universal wheel device in the first embodiment;

[0026] Figure 5 is a partial cross-sectional schematic diagram of the support foot and the universal wheel device in the first embodiment;

[0027] Figure 6 yes Figure 5 The enlarged view of point A in the middle;

[0028] Figure 7 yes Figure 5 The enlarged view of point B in the middle;

[0029] Figure 8 is a schematic diagram of the structure of the components in the fixing frame in the first embodiment;

[0030] Fig. 9 is a partial cross-sectional schematic diagram of the support foot and the universal wheel device in the second embodiment;

[0031] Fig.10 yes Fig. 9 Enlarged view of point C in the middle;

[0032] Fig.11 It is a structural schematic diagram of the control column mechanism in the second embodiment.

[0033] Figure numerals: 1, center frame; 2, connecting frame; 3, mounting groove; 4, positioning hole 1; 5, spring sheet buckle; 51, V-shaped spring sheet; 52, protrusion; 521, deformation gap; 6, supporting foot; 7, mounting hole; 8, positioning hole 2; 9, plug hole; 10, universal wheel device; 11, fixing frame; 12, groove; 13, guide hole; 14, plug column; 15, hinge frame; 16, hinge slot 1; 17, hinge shaft 1; 18, turntable; 19, hinge slot 2; 20, hinge shaft 2; 21, connecting rod; 22, The first wheel frame; 23, the first universal wheel; 24, the positioning groove; 25, the positioning ring; 26, the first clamping hole; 27, the first clamping groove; 28, the first reset spring; 29, the first clamping block; 30, the spring groove; 31, the force plate; 32, the rotating shaft; 33, the cam; 34, the elastic member; 35, the bearing groove; 36, the bearing; 37, the positioning slide groove; 38, the wheel mounting groove; 39, the positioning roller; 40, the second wheel frame; 41, the second universal wheel; 42, the second clamping hole; 43, the second clamping groove; 44, the second reset spring; 45, the second clamping block. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0035] Embodiment 1:

[0036] like Figure 1 and Figure 2 As shown, a combined office chair base includes a center frame 1, and the cross section of the center frame 1 is annular. In this embodiment, five connecting frames 2 are fixedly connected to the side wall of the center frame 1, and the five connecting frames 2 are equidistantly distributed in a circle. A mounting groove 3 is opened in the middle of each connecting frame 2, and two positioning holes 4 are opened upward on the side wall of each connecting frame 2, and the two positioning holes 4 are connected to the mounting groove 3.

[0037] like Figure 2 and Figure 3 As shown, each mounting groove 3 is provided with a spring sheet buckle 5, and the spring sheet buckle 5 includes a V-shaped spring sheet 51 and a protrusion 52. The V-shaped spring sheet 51 is in a "V" shape as a whole, and the V-shaped spring sheet 51 can be bent and deformed. There are two protrusions 52, which are arranged together on one of the sheets of the V-shaped spring sheet 51, and a deformation gap 521 is opened in the middle of each protrusion 52.

[0038] By setting the deformation gap 521, the protrusion 52 can be deformed, so that the protrusion 52 can move in the positioning hole 1 4 and the positioning hole 2 8. When working, the two pieces of the V-shaped spring piece 51 abut against the groove wall of the installation groove 3, and the two protrusions 52 pass through the two positioning holes 1 4 respectively; when the two protrusions 52 are pressed, the two pieces of the V-shaped spring piece 51 approach each other, and the protrusion 52 moves toward the direction close to the installation groove 3.

[0039] like Figure 1 and Figure 2 As shown, each connecting frame 2 is detachably connected to a supporting foot 6, which is in an "L" shape as a whole. A mounting hole 7 is provided in the middle of the supporting foot 6, and the two ends of the mounting hole 7 are respectively flush with the two end surfaces of the supporting foot 6. The mounting hole 7 is used for inserting the connecting frame 2. A second positioning hole 8 is provided on the side wall of the supporting foot 6 close to the connecting frame 2, which is connected to the mounting hole 7. There are two positioning holes 8, which are used to align with the two positioning holes 1 4 respectively. Figure 5 As shown, four insertion holes 9 are provided on the side wall of the supporting foot 6 away from the connecting frame 2 . The four insertion holes 9 are equidistantly distributed around the circumference and are all connected to the mounting hole 7 .

[0040] The installation process of the modular office chair base is as follows:

[0041] The user presses the two protrusions 52, and the two plates of the V-shaped spring piece 51 approach each other, and the protrusion 52 moves toward the direction close to the installation groove 3 and enters the positioning hole 1 4, and then one end of the supporting foot 6 is sleeved on the connecting frame 2, and the positioning hole 1 4 is aligned with the positioning hole 2 8. Under the resetting action of the V-shaped spring piece 51, the two protrusions 52 pass through the positioning hole 1 4 and are inserted into the positioning hole 2 8, so that the connecting frame 2 and the supporting foot 6 are connected together. The base of the combined office chair is easy to disassemble and assemble, occupies less space, and is convenient for storage and transportation.

[0042] like Figure 4 and Figure 5 As shown, a universal wheel device 10 is detachably mounted on one end of the support foot 6 away from the connecting frame 2. The universal wheel device 10 includes a fixing frame 11. The fixing frame 11 is cylindrical and is plugged into the mounting hole 7. A groove 12 is provided on the bottom surface of the fixing frame 11, and the cross section of the groove 12 is circular. Four guide holes 13 are provided on the side wall of the fixing frame 11. The four guide holes 13 are equidistantly distributed on the circumference and are all connected to the groove 12. The four guide holes 13 are used to align with the four sockets 9. A plug post 14 is slidably arranged in each guide hole 13. The plug post 14 is used to pass through the socket 9 so that the support foot 6 and the fixing frame 11 are connected together. A control column mechanism is provided in the groove 12, and the control column mechanism is used to control the reciprocating movement of the plug post 14 in the guide hole 13.

[0043] like Figure 6 and Figure 8 As shown, one end of each plug post 14 close to the groove 12 is fixedly connected to a hinge frame 15, and a hinge groove 16 is formed on the end surface of the hinge frame 15 facing the groove 12, and a hinge shaft 17 is fixedly connected in each hinge groove 16.

[0044] like Figure 6 and Figure 8 As shown, the column control mechanism includes a turntable 18 and a connecting rod 21. The turntable 18 is coaxially arranged at the center of the groove 12, and a hinge groove 2 19 is provided on the outer wall of the turntable 18, and the cross section of the hinge groove 2 19 is a circular ring. Four hinge shafts 20 are fixedly installed in the hinge groove 2 19, and the four hinge shafts 20 are equidistantly distributed around the circumference, and the positions of the four hinge shafts 20 20 correspond to the four hinge shafts 1 17 respectively. There are four connecting rods 21, and one end of each of the four connecting rods 21 is hinged to the hinge frame 15 through the hinge shaft 1 17, and the other end is hinged to the turntable 18 through the hinge shaft 2 20.

[0045] like Figure 5As shown, a first wheel frame 22 is coaxially fixed to the bottom of the turntable 18. The first wheel frame 22 is cylindrical and is inserted into the groove 12 and rotates with the groove 12. A first universal wheel 23 is fixedly mounted on the bottom surface of the first wheel frame 22. The first universal wheel 23 is located outside the groove 12. The first universal wheel 23 can provide a force point for the user to rotate the second wheel frame 40.

[0046] like Figure 5 and Figure 8 As shown, a positioning groove 24 is provided on the inner wall of the fixing frame 11, and the cross section of the positioning groove 24 is annular. A positioning ring 25 is fixedly connected to the side wall of the first wheel frame 22, and the positioning ring 25 is embedded in the positioning groove 24 and forms a rotational fit therewith. When the positioning ring 25 is embedded in the positioning groove 24, the first wheel frame 22 cannot move up and down in the groove 12, which is beneficial to increase the stability of the universal wheel device 10.

[0047] like Figure 7 and Figure 8 As shown, a clamping hole 26 connected to the positioning groove 24 is provided on the outer wall of the fixing frame 11, and the cross section of the clamping hole 26 is circular. A clamping groove 27 aligned with the clamping hole 26 is provided on the side wall of the positioning ring 25, and the cross section of the clamping groove 27 is circular. A return spring 28 is connected to the bottom wall of the clamping groove 27, and a clamping block 29 is connected to the end of the return spring 28 away from the bottom wall of the clamping groove 27. The clamping block 29 is bullet-shaped and is engaged with the clamping hole 26. When the clamping block 29 is inserted into the clamping hole 26, the first wheel frame 22 is restricted from rotating.

[0048] The installation process of the modular office chair base is as follows:

[0049] During installation, the user inserts the fixing frame 11 into the mounting hole 7 at one end away from the connecting frame 2, and aligns the four guide holes 13 with the four insertion holes 9, and then rotates the first universal wheel 23, so that the first wheel frame 22 and the turntable 18 rotate accordingly, and then the plug post 14 extends outward and passes through the insertion hole 9 under the push of the connecting rod 21; at the same time, the card slot 127 and the card hole 126 are aligned, and the reset spring 128 is reset to push the card block 129 to be inserted into the card hole 126, so that the rotating shaft 32, the first wheel frame 22, and the first universal wheel 23 are restricted from rotating, and the plug post 14 remains in the state of passing through the insertion hole 9. At this time, the universal wheel device 10 can be detachably installed on the supporting foot 6, and the universal wheel device 10 is relatively convenient to disassemble and assemble.

[0050] Embodiment 2:

[0051] A combined office chair base, the difference between the second embodiment and the first embodiment is that:

[0052] like Fig. 9 and Fig.10As shown, four spring slots 30 are provided on the inner side wall of the fixing frame 11, and the spring slots 30 are connected to the guide hole 13. The cross section of the spring slots 30 is circular and concentric with the guide hole 13, and the diameter of the spring slots 30 is larger than the aperture of the guide hole 13. A force plate 31 is integrally connected to the outer side wall of the plug post 14, and the force plate 31 is annular and slidably cooperates with the spring slots 30.

[0053] like Fig. 9 and Fig.10 As shown, the column control mechanism includes a rotating shaft 32, a cam 33, and an elastic member 34. A bearing groove 35 is provided on the bottom wall of the groove 12, and the cross section of the bearing groove 35 is circular. The rotating shaft 32 is cylindrical and is rotatably arranged at the center of the groove 12. A bearing 36 is sleeved on the end of the rotating shaft 32, and the bearing 36 and the bearing groove 35 are mutually engaged, and the bearing groove 35 and the bearing 36 are interference fit. Through the tight fit between the bearing groove 35 and the bearing 36, and the bearing 36 and the rotating shaft 32, on the one hand, the rotating shaft 32 is not easy to move in the vertical direction, and on the other hand, the user can rotate the rotating shaft 32 more easily.

[0054] like Fig.10 and Fig.11 As shown, the cam 33 is coaxially arranged in the middle of the rotating shaft 32, and the outer contour of the cam 33 is an arc-shaped curved surface of four protrusions 52 and four concave arc-shaped curved surfaces arranged alternately. The elastic member 34 is a control column spring sleeved on the plug post 14, one end of the control column spring is connected to the bottom wall of the spring groove 30, and the other end is connected to the force plate 31. The elastic member 34 is used to push the plug post 14 to move in the direction close to the cam 33, and the end of the plug post 14 facing the cam 33 is always in contact with the outer contour of the cam 33 under the drive of the elastic member 34, and the plug post 14 performs linear reciprocating motion in the guide hole 13 driven by the cam 33. When the end of the plug post 14 facing the cam 33 is in contact with the lowest point of the concave of the cam 33, the plug post 14 is completely located in the guide hole 13, and the elastic member 34 is used to push the plug post 14 to move in the direction close to the cam 33. When one end of the plug post 14 facing the cam 33 is in contact with the highest point of the protrusion 52 of the cam 33 , the end of the plug post 14 extends out of the guide hole 13 .

[0055] like Fig.10 and Fig.11As shown, a positioning groove 37 is provided on the outer contour of the cam 33, and the cross section of the positioning groove 37 is rectangular. A wheel mounting groove 38 is provided on the end of each plug post 14 facing the cam 33, and a positioning roller 39 is rotatably provided in each wheel mounting groove 38. The positioning roller 39 is embedded in the positioning groove 37, and the positioning roller 39 rolls with the bottom wall of the positioning groove 37. By providing the positioning groove 37 and the positioning roller 39, the end of the plug post 14 close to the cam 33 can more stably fit the outer contour of the cam 33 for movement, and at the same time, the plug post 14 can more stably make linear reciprocating motion in the guide hole 13.

[0056] like Fig. 9 As shown, a second wheel frame 40 is coaxially fixed to the bottom of the rotating shaft 32. The second wheel frame 40 is cylindrical and is inserted into the groove 12 and rotates with the groove 12. A second universal wheel 41 is fixedly mounted on the bottom surface of the second wheel frame 40. The second universal wheel 41 is located outside the groove 12. The second universal wheel 41 can provide a force point for the user to rotate the second wheel frame 40.

[0057] like Fig. 9 As shown, a second clamping hole 42 is provided on the outer wall of the fixing frame 11 and is connected to the groove 12. The cross section of the second clamping hole 42 is circular. A second clamping groove 43 is provided on the side wall of the second wheel frame 40 and is used to align with the second clamping hole 42. The cross section of the second clamping groove 43 is circular. A second reset spring 44 is connected to the bottom wall of the second clamping groove 43. A second clamping block 45 is connected to the end of the second reset spring 44 away from the bottom wall of the second clamping groove 43. The second clamping block 45 is bullet-shaped and is engaged with the second clamping hole 42. When the second clamping block 45 is inserted into the second clamping hole 42, the second wheel frame 40 is restricted from rotating to a certain extent.

[0058] The installation process of the modular office chair base is as follows:

[0059] During installation, the user inserts the fixing frame 11 into the mounting hole 7 away from the end of the connecting frame 2, and aligns the four guide holes 13 with the four insertion holes 9, and then rotates the second universal wheel 41, so that the second wheel frame 40, the rotating shaft 32, and the cam 33 rotate accordingly, until the end of the plug post 14 moves toward the cam 33 from the lowest point of the depression of the cam 33 to the highest point of the protrusion 52, and the plug post 14 extends outward and passes through the insertion hole 9 under the push of the cam 33. At the same time, the second slot 43 is aligned with the second hole 42, the reset spring 44 is reset and then pushes the second block 45 to move away from the reset spring 44 until the second block 45 is inserted into the second hole 42. The second universal wheel 41, the second wheel frame 40, the rotating shaft 32, and the cam 33 are restricted from rotating, and the plug post 14 remains in a state of passing through the insertion hole 9. At this time, the universal wheel device 10 can be detachably installed on the supporting foot 6, and the universal wheel device 10 is relatively convenient to disassemble and assemble.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A modular office chair base, comprising a center frame (1), characterized in that: A connecting frame (2) with a mounting groove (3) in the middle is circumferentially arranged on the side wall of the central frame (1); a positioning hole (4) communicating with the mounting groove (3) is arranged on the side wall of each connecting frame (2); a supporting foot (6) is arranged on each connecting frame (2); a mounting hole (7) for inserting the connecting frame (2) is arranged in the middle of the supporting foot (6); a positioning hole (8) communicating with the mounting hole (7) and used to align with the positioning hole (4) is arranged on the side wall of the supporting foot (6); a spring sheet buckle (5) is arranged in the mounting groove (3); the spring sheet buckle (5) comprises a V-shaped spring sheet (51) capable of bending and deforming, and a spring sheet buckle (5) arranged on the V-shaped spring sheet (51) and used to sequentially A protrusion (52) passes through the first positioning hole (4) and the second positioning hole (8), and a deformation gap (521) is provided in the middle of the protrusion (52). A plug hole (9) connected to the mounting hole (7) is provided on the side wall of the support foot (6) away from the connecting frame (2). A universal wheel device (10) is detachably installed at one end of the support foot (6) away from the connecting frame (2). The universal wheel device (10) includes a fixing frame (11) plug-fitted with the mounting hole (7). A groove (12) is provided on the bottom surface of the fixing frame (11). A plurality of guide holes (13) connected to the groove (12) are provided on the side wall of the fixing frame (11), and each of the guide holes (13) is slidably provided with a guide hole (9) for connecting with the plug hole (9). A plug-in plug-in column (14), the groove (12) is provided with a column control mechanism for controlling the reciprocating movement of the plug-in column (14) in the guide hole (13), each of the plug-in columns (14) is provided with an articulated frame (15) at one end close to the groove (12), the articulated frame (15) is provided with an articulated groove (16) on the end surface facing the groove (12), the articulated groove (16) is provided with an articulated shaft (17), the column control mechanism comprises a turntable (18) rotatably arranged at the center of the groove (12) and a plurality of connecting rods (21), the turntable (18) is provided with an articulated groove (19) on the side wall, the articulated groove (19) is provided with an articulated shaft (20) corresponding to each plug-in column (14), each Each of the connecting rods (21) is hinged to the hinge frame (15) at one end through a hinge shaft 1 (17), and is hinged to the turntable (18) at the other end through a hinge shaft 2 (20). The bottom of the turntable (18) is coaxially provided with a first wheel frame (22) which is rotatably matched with the groove (12) and has a first universal wheel (23) mounted on the bottom surface. The column control mechanism comprises a rotating shaft (32) rotatably arranged at the center of the groove (12), and a cam (33) coaxially arranged on the rotating shaft (32). The outer contour of the cam (33) is a plurality of convex arc surfaces and concave arc surfaces arranged alternately. The plug column (14) is provided with a portion for driving the end of the plug column (14) close to the cam (33) to fit the outer contour of the cam (33).The elastic member (34) enables the plug post (14) to reciprocate in the guide hole (13) under the drive of the cam (33). The bottom of the rotating shaft (32) is coaxially provided with a second wheel frame (40) which is rotatably matched with the groove (12) and has a second universal wheel (41) installed on the bottom surface.

2. The combined office chair base according to claim 1, characterized in that: A positioning groove (24) is provided on the inner wall of the fixing frame (11), and a positioning ring (25) is provided on the side wall of the first wheel frame (22) and is embedded in the positioning groove (24) and forms a rotational fit therewith.

3. The combined office chair base according to claim 2, characterized in that: The outer wall of the fixing frame (11) is provided with a clamping hole (26) which is connected with the positioning groove (24); the side wall of the positioning ring (25) is provided with a clamping groove (27) which is aligned with the clamping hole (26); a return spring (28) is provided on the bottom wall of the clamping groove (27); and a clamping block (29) which is engaged with the clamping hole (26) is provided at one end of the return spring (28) away from the bottom wall of the clamping groove (27).

4. The combined office chair base according to claim 1, characterized in that: The inner wall of the fixing frame (11) is provided with a plurality of spring grooves (30) connected with the guide holes (13); the plug post (14) is provided with a force plate (31) slidably matched with the spring grooves (30); the elastic member (34) is a column control spring which is sleeved on the plug post and has one end connected to the bottom wall of the spring groove (30) and the other end connected to the force plate (31).

5. The combined office chair base according to claim 1, characterized in that: A positioning groove (37) is provided on the outer contour of the cam (33), and a wheel mounting groove (38) is provided on one end of each of the plug posts (14) facing the cam (33). A positioning roller (39) is provided in each of the wheel mounting grooves (38) and is in rolling engagement with the bottom wall of the positioning groove (37).

6. The combined office chair base according to claim 1, characterized in that: The outer wall of the fixing frame (11) is provided with a second clamping hole (42) connected to the groove (12); the side wall of the second wheel frame (40) is provided with a second clamping groove (43) aligned with the second clamping hole (42); the bottom wall of the second clamping groove (43) is connected with a second return spring (44); and the end of the second return spring (44) away from the bottom wall of the second clamping groove (43) is provided with a second clamping block (45) engaged with the second clamping hole (42).

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