Rolling adjusting mechanism and height-adjustable table and chair

Abstract

The utility model discloses a rolling adjusting mechanism and a height-adjustable table and chair. The rolling adjusting mechanism comprises a first rod body and a second rod body, the second rod body and the first rod body are sleeved inside and outside, the second rod body can move back and forth in the axial direction relative to the first rod body, and a locking mechanism is arranged between the second rod body and the first rod body; balls are arranged between the second rod body and the first rod body, and the second rod body and the first rod body are matched through rolling friction of the balls. The balls are arranged between the second rod body and the first rod body, so that the second rod body and the first rod body are matched through rolling friction of the balls, a traditional mode that a sliding piece is arranged and sliding friction is adopted is replaced, friction force is effectively reduced, movable adjustment is smoother, the clamping phenomenon is avoided, meanwhile, the fit clearance is small, and the service life is prolonged. The shaking phenomenon is avoided, and convenience is brought to use.

Description

Technical Field

[0001] This utility model relates to the field of furniture technology, and in particular to a rolling adjustment mechanism and a height-adjustable table and chair. Background Technology

[0002] Height-adjustable desks and chairs, as the name suggests, refer to desks and chairs whose height can be adjusted according to the user's needs. This design is primarily intended to accommodate people of different heights and meet the needs of various activities and tasks, thereby providing optimal comfort and work efficiency. Height-adjustable desks and chairs are widely used in offices, schools, homes, and other settings. They not only improve user comfort and work efficiency but also help prevent physical problems caused by maintaining poor posture for extended periods. Furthermore, with increasing public awareness of health and comfort, height-adjustable desks and chairs have become a popular trend in the modern office furniture market.

[0003] The adjustment mechanism is a crucial component of height-adjustable tables and chairs. Currently, the main structure of such mechanisms typically includes a first rod and a second rod. The second rod is inner and outer fitted with the first rod, and the second rod can move back and forth axially relative to the first rod. A locking mechanism is provided between the second and first rods. In existing technology, the engagement between the second and first rods uses a sliding plate to reduce gaps and wobbling. This engagement relies on sliding friction, which has strict dimensional requirements, high friction, and is prone to wobbling if the gap is too large, and jamming if the gap is too small, causing considerable inconvenience for adjustment. Therefore, it is necessary to improve the current adjustment mechanism. Utility Model Content

[0004] In view of this, the present invention addresses the deficiencies of the existing technology, and its main purpose is to provide a rolling adjustment mechanism and a height-adjustable table and chair, which can effectively solve the problem of inconvenient adjustment caused by the high friction of the existing adjustment mechanism.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A rolling adjustment mechanism includes a first rod and a second rod; the second rod is inner and outer fitted with the first rod, the second rod is movably arranged relative to the first rod along the axial direction, and a locking mechanism is provided between the second rod and the first rod; a ball is provided between the second rod and the first rod, and the second rod and the first rod are engaged by rolling friction of the ball.

[0007] As a preferred embodiment, the second rod is fitted outside the first rod and moves back and forth along the axial direction of the first rod.

[0008] As a preferred embodiment, the ball is disposed at the end of the first rod and makes rolling frictional contact with the inner wall of the second rod.

[0009] As a preferred embodiment, the first rod includes a main tube and a mounting base, the mounting base being fixed to the end of the main tube, and the ball being rotatably mounted on the side of the mounting base, so that the ball is securely mounted.

[0010] As a preferred embodiment, a slot is provided at the opening of the end of the main tube. The mounting base has a fixing part and a protrusion. The fixing part is embedded in the opening of the end of the main tube for fixation. The protrusion is engaged in the slot. A mounting groove is recessed on the protrusion. The ball is rotatably mounted in the mounting groove.

[0011] As a preferred embodiment, each side of the end of the main tube is provided with a slot, and the mounting base has multiple protrusions that are engaged in the corresponding slots. Each protrusion is recessed with a mounting groove, and each mounting groove is equipped with a ball bearing. The multiple balls bearings roll and rub against each inner sidewall of the second rod to make the adjustment movement smoother.

[0012] As a preferred embodiment, a through hole is provided on the side of the end of the main tube, and a fixing hole is provided on the fixing part accordingly. A fixing screw passes through the through hole from the outside to the inside and is screwed into the fixing hole for fixation. The structure is simple and easy to disassemble and assemble.

[0013] As a preferred embodiment, the locking mechanism is disposed on the second rod, and the first rod has multiple locking holes arranged at intervals along the axial direction of the first rod. The locking mechanism locks into the corresponding locking holes, which is simple in structure and convenient to operate.

[0014] A height-adjustable table and chair includes two rolling adjustment mechanisms, a support leg, a seat cushion, and a backrest; the two rolling adjustment mechanisms are symmetrically arranged left and right and extend forward and backward at an angle, with the second rod located above the first rod; the support leg is fixedly connected between the lower ends of the first rods of the two rolling adjustment mechanisms and extends backward at an angle; the seat cushion is fixedly connected between the lower ends of the second rods of the two rolling adjustment mechanisms; and the backrest is fixedly connected between the upper ends of the second rods of the two rolling adjustment mechanisms.

[0015] As a preferred embodiment, a foot pedal is fixedly connected between the lower ends of the first rods of the two rolling adjustment mechanisms to support the feet.

[0016] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution:

[0017] By incorporating ball bearings between the second and first rods, the two rods engage in rolling friction, replacing the traditional sliding friction method using a sliding plate. This effectively reduces friction, resulting in smoother adjustments without jamming. Furthermore, the smaller gap prevents wobbling and enhances usability.

[0018] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a three-dimensional assembly diagram of a preferred embodiment of the present invention;

[0020] Figure 2 This is a partial exploded view of a preferred embodiment of the present invention;

[0021] Figure 3 This is a cross-sectional view of a preferred embodiment of the present invention;

[0022] Figure 4 yes Figure 3 An enlarged view of position A in the middle.

[0023] Explanation of reference numerals in the attached diagram:

[0024] 10. Rolling adjustment mechanism; 11. First rod.

[0025] 111. Main pipe; 112. Mounting bracket

[0026] 1121, fixed part 1122, convex part

[0027] 113. Fixing screw; 12. Second rod body

[0028] 13. Locking mechanism 14. Ball bearing

[0029] 101. Card slot; 102. Through hole

[0030] 103. Locking hole; 104. Fixing hole

[0031] 105. Mounting slot 20. Support leg

[0032] 30. Seat cushion; 40. Chair back.

[0033] 50. Foot pedal. Detailed Implementation

[0034] Please refer to Figures 1 to 4 As shown, it illustrates the specific structure of a rolling adjustment mechanism 10 according to a preferred embodiment of the present invention, which includes a first rod 11 and a second rod 12.

[0035] The second rod 12 is fitted inside and out with the first rod 11. The second rod 12 is movably arranged axially relative to the first rod 11, and a locking mechanism 13 is provided between the second rod 12 and the first rod 11. Furthermore, a ball bearing 14 is provided between the second rod 12 and the first rod 11, and the second rod 12 and the first rod 11 are engaged by rolling friction with the ball bearing 14. Specifically:

[0036] The first rod 11 includes a main tube 111 and a mounting base 112. The main tube 111 is a metal tube. A slot 101 is provided at the opening at the end of the main tube 111. A slot 101 is also provided on each side of the end of the main tube 111. A through hole 102 is provided on the side of the end of the main tube 111. A plurality of locking holes 103 are provided on the first rod 11. The plurality of locking holes 103 are arranged at intervals along the axial direction of the first rod 11 and are all located on the main tube 111. The mounting base 112 is a plastic part, which is fixed to the end of the main tube 111. The mounting base 112 has a fixing part 1121 and a protrusion 1122. The fixing part 1121 is embedded in the opening at the end of the main tube 111 for fixation. The fixing part 1121 has a fixing hole 104. A fixing screw 113 passes through the through hole 102 from the outside to the inside and is screwed into the fixing hole 104 for fixation, so that the mounting base 112 is installed firmly. The protrusion 1122 is engaged in the slot 101. The protrusion 1122 has a recessed mounting groove 105. The mounting base 112 has multiple protrusions 1122, which are engaged in the corresponding slots 101, so that the mounting base 112 is installed more firmly. Each protrusion 1122 has a recessed mounting groove 105.

[0037] The second rod 12 is fitted around the first rod 11 and moves back and forth along the axial direction of the first rod 11. In this embodiment, the second rod 12 is a metal tube.

[0038] The locking mechanism 13 is disposed on the second rod 12, and the locking mechanism 13 is locked in place with the corresponding locking hole 103.

[0039] The ball bearing 14 is disposed at the end of the first rod 11 and rolls and rubs against the inner wall of the second rod 12. In this embodiment, the ball bearing 14 is rotatably mounted on the side of the mounting base 112, specifically, the ball bearing 14 is rotatably mounted in the mounting groove 105, ensuring a secure installation. Furthermore, each mounting groove 105 contains a ball bearing 14, and the multiple balls bearing 14 roll and rub against the inner walls of the second rod 12, making the movement smoother and easier to adjust.

[0040] This utility model also discloses a height-adjustable table and chair, including two aforementioned rolling adjustment mechanisms 10, a support leg 20, a seat cushion 30, and a chair back 40.

[0041] Two rolling adjustment mechanisms 10 are symmetrically arranged horizontally and extend backward at an angle, with the second rod 12 located above the first rod 11. A support leg 20 is fixedly connected between the lower ends of the first rods 11 of the two rolling adjustment mechanisms 10, and extends backward at an angle. A seat cushion 30 is fixedly connected between the lower ends of the second rods 12 of the two rolling adjustment mechanisms 10. A backrest 40 is fixedly connected between the upper ends of the second rods 12 of the two rolling adjustment mechanisms 10. Furthermore, a footrest 50 is fixedly connected between the lower ends of the first rods 11 of the two rolling adjustment mechanisms 10.

[0042] The usage method of this embodiment is described in detail below:

[0043] First, the locking mechanism 13 is released. Then, the second rod 12 is moved up and down relative to the first rod 11 to adjust the height of the second rod 12 relative to the first rod 11. The seat cushion 30 and the backrest 40 are adjusted up and down with the second rod 12 to achieve height adjustment. During the up and down adjustment, the ball bearing 14 rolls against the inner wall of the second rod 12, so that the up and down adjustment of the second rod 12 relative to the first rod 11 is smooth, without jamming, and with little shaking.

[0044] The key design feature of this invention is that by setting a ball bearing between the second rod and the first rod, the two rods can engage in rolling friction through the ball bearing, replacing the traditional sliding friction method using a sliding plate. This effectively reduces friction, making the adjustment smoother and preventing jamming. At the same time, the small gap between the parts prevents wobbling and makes it more convenient to use.

[0045] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A rolling adjustment mechanism, comprising a first rod and a second rod; the second rod is inner and outer fitted with the first rod, the second rod is movably disposed relative to the first rod along the axial direction, and a locking mechanism is provided between the second rod and the first rod; characterized in that: A ball bearing is provided between the second rod and the first rod, and the second rod and the first rod are engaged by rolling friction of the ball bearing; the second rod is sleeved outside the first rod and moves back and forth along the axial direction of the first rod; the ball bearing is located at the end of the first rod and makes rolling friction contact with the inner wall of the second rod; the first rod includes a main tube and a mounting base, the mounting base is fixed to the end of the main tube, and the ball bearing is rotatably mounted on the side of the mounting base; a slot is provided at the opening at the end of the main tube, the mounting base has a fixing part and a protrusion, the fixing part is embedded in the opening at the end of the main tube and fixed, the protrusion is engaged in the slot, and a mounting groove is recessed on the protrusion, in which the ball bearing is rotatably mounted.

2. The rolling adjustment mechanism according to claim 1, characterized in that: Each side of the end of the main tube is provided with a slot, and the mounting base has multiple protrusions that are engaged in the corresponding slots. Each protrusion is recessed with a mounting groove, and each mounting groove is equipped with a ball bearing. The multiple balls bearings make rolling friction contact with each inner sidewall of the second rod.

3. The rolling adjustment mechanism according to claim 1, characterized in that: The end side of the main tube has a through hole, and correspondingly, the fixing part has a fixing hole. A fixing screw passes through the through hole from the outside to the inside and is screwed into the fixing hole for fixation.

4. The rolling adjustment mechanism according to claim 1, characterized in that: The locking mechanism is disposed on the second rod, and the first rod has a plurality of locking holes arranged at intervals along the axial direction of the first rod. The locking mechanism locks into the corresponding locking holes.

5. A height-adjustable table and chair, characterized in that: The chair includes two rolling adjustment mechanisms as described in any one of claims 1-4, a support leg, a seat cushion, and a backrest; the two rolling adjustment mechanisms are symmetrically arranged left and right and extend forward and backward at an angle, with the second rod located above the first rod; the support leg is fixedly connected between the lower ends of the first rods of the two rolling adjustment mechanisms and extends backward at an angle; the seat cushion is fixedly connected between the lower ends of the second rods of the two rolling adjustment mechanisms; and the backrest is fixedly connected between the upper ends of the second rods of the two rolling adjustment mechanisms.

6. The height-adjustable table and chairs according to claim 5, characterized in that: A foot pedal is fixedly connected between the lower ends of the first rods of the two rolling adjustment mechanisms.

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