Adjustable tables and chairs

Abstract

The present invention relates to a liftable table and chair, including a table and chair lifting device, which includes at least a pair of outer supporting legs, a pair of inner supporting legs, a pair of racks, and a cross-shaped locking mechanism; it also includes a tabletop arranged on the upper end surfaces of the two sets of outer supporting legs, the inner supporting legs are installed in the outer supporting leg sleeves, and can be lifted up and down in the height direction; the outer supporting legs are fixedly connected to the cross-shaped locking mechanism; a pair of racks are relatively arranged on the inner sides of the inner supporting legs; the cross-shaped locking mechanism acts on the rack, and when the cross-shaped locking mechanism is disengaged from the rack, the cross-shaped locking mechanism can be lifted up and down in the height direction, thereby driving the outer supporting legs to move up and down; when the cross-shaped locking mechanism is engaged with the rack, the cross-shaped locking mechanism and the outer supporting legs are stabilized at a corresponding height. The technical solution provided by the present invention can adjust the height of tables and chairs, has the advantages of being convenient and fast, safe and reliable, simple in structure, and highly practical, and has broad promotion prospects.

Description

Technical Field

[0001] The present invention relates to the field of liftable tables and chairs, and in particular to a liftable table and chair that is easy to adjust the height of and is used on desks and chairs, computer desks, office desks or other desks and chairs. Background Art

[0002] Currently, various desks and chairs sometimes require height adjustment based on the user's sitting height. Students' heights change rapidly with age, so desks and chairs need to be constantly adjusted to protect their eyesight. Furthermore, people of different heights may have different height requirements for desks and chairs, requiring constant adjustment during use.

[0003] Currently, most tables and chairs are height-adjustable via screw holes. To adjust the height, you first need to loosen the screws, disassemble the table and legs, and finally tighten the screws. This makes disassembly and assembly difficult, and screws rust over time, making adjustment difficult. Furthermore, the price of hand-cranked tables and chairs is over three times that of traditional models, limiting their widespread adoption.

[0004] To this end, based on the current problems, the applicant believes that it is necessary to provide a lifting device that can quickly adjust the height of tables and chairs according to needs. Summary of the Invention

[0005] In view of this, the object of the present invention is to overcome the deficiencies of the prior art and provide a lifting device that enables tables and chairs to quickly adjust their heights according to needs, and liftable tables and chairs using the device.

[0006] To achieve the above-mentioned purpose, the first aspect of the present invention provides a table and chair lifting device that is easy to adjust the height, comprising a pair of outer support legs, a pair of inner support legs, a pair of racks, and a cross-shaped locking mechanism;

[0007] The inner supporting leg is mounted in the outer supporting leg and can be raised and lowered in height. The outer supporting leg is fixedly connected to the cross-shaped locking mechanism. A pair of racks are arranged on the inner side of the inner supporting leg. The cross-shaped locking mechanism acts on the racks and has two states: a first position and a second position.

[0008] The first working position is: when the cross-shaped locking mechanism is disengaged from the rack, the cross-shaped locking mechanism can be raised and lowered in the height direction, thereby driving the outer support leg to move up and down;

[0009] The second working position is: when the cross-shaped locking mechanism is engaged with the rack, the cross-shaped locking mechanism and the outer supporting legs are stabilized at corresponding heights.

[0010] Furthermore, it also includes a support frame, the outer support legs are a three-sided hollow structure, and the hollow surfaces of the left and right outer support legs are arranged opposite to each other; the support frame is fixedly connected to the left and right outer support legs; the cross-shaped locking mechanism is fixedly connected to the support frame.

[0011] Furthermore, the outer supporting leg is a three-sided hollow structure, and the rack is fixed inside the inner supporting leg.

[0012] Furthermore, the cross-shaped locking mechanism includes first and second support rods and a support shaft; the centers of the two support rods are fixed to the support shaft and can rotate around the support shaft, and the support shaft is fixedly arranged on the support frame; it also includes first and second reset springs, one end of the first reset spring is fixed to one end of the first support rod, and the other end of the first reset spring is fixed to one end of the second support rod; one end of the second reset spring is fixed to the other end of the second support rod, and the other end of the second reset spring is fixed to the other end of the second support rod; when the first and second reset springs are stretched, the first and second support rods are disengaged from the rack; when the first and second reset springs are reset, the first and second support rods are engaged with the rack.

[0013] Furthermore, it also includes an adjustment handle, a bracket and a pull wire; wherein

[0014] The bracket is fixed in the outer support leg; the adjustment handle is placed on the bracket, and the adjustment handle can move up and down in the outer support leg; one end of the pull wire is fixed on the adjustment handle, and the other end of the pull wire is fixed on the cross-shaped locking mechanism. The adjustment handle moves up and down, driving the cross-shaped locking mechanism to disengage from the rack or engage with the rack through the pull wire.

[0015] Furthermore, it also includes a connecting line and a connecting buckle, wherein

[0016] The connecting buckle is sleeved on the connecting line; one end of the connecting line is fixed to one end of the first support rod, and the other end of the connecting line is fixed to the other end of the second support rod; the other end of the pull wire is fixed to the connecting buckle.

[0017] Preferably, the adjustment handle is provided with a handle which is recessed inwards.

[0018] Preferably, the adjustment handle is a three-sided hollow structure, which is sleeved inside the left and right outer support legs with the hollow side facing outward.

[0019] A second aspect of the present invention provides a liftable table and chair, which uses two sets of the above-mentioned table and chair lifting devices that are easy to adjust the height; and also includes a tabletop arranged on the upper end surfaces of the two sets of outer support legs.

[0020] Furthermore, it also includes a support base, and two sets of inner support legs are arranged on the support base.

[0021] The present invention adopts the above technical solution. When the height of the table and chair lifting device needs to be adjusted, the adjustment handle is lifted upward. The adjustment handle drives the cross-shaped locking mechanism to rotate through the pull wire and the connecting wire, so that the cross-shaped locking mechanism is separated from the rack, thereby adjusting the height of the table and chair. After reaching the desired height, the adjustment handle is released. The cross-shaped locking mechanism is engaged and fixed with the rack by the action of the return spring, thereby fixing the height of the table and chair, and the adjustment handle is placed back on the bracket. It has the following beneficial effects:

[0022] 1. The height can be adjusted precisely through the engagement of the cross-shaped locking mechanism and the rack;

[0023] 2. The cross-shaped locking mechanism is fixed to the rack through the reset spring to ensure high stability;

[0024] 3. Pull the cable by adjusting the handle to control the cross-shaped locking mechanism to facilitate users to adjust the height.

[0025] 4. The present invention adopts the above technical solution, which can adjust the height of tables and chairs. It has the advantages of convenience, speed, safety, reliability, simple structure, easy processing and manufacturing of required materials, low cost, and strong practicality, and has broad promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the supporting leg structure of the table and chair lifting device of the present invention;

[0028] Figure 2 This is a schematic diagram of the support leg structure of the table and chair lifting device of the present invention;

[0029] Figure 3 This is a structural diagram of the table and chair lifting device of the present invention;

[0030] Figure 4 It is a structural schematic diagram of the liftable table of the present invention.

[0031] In the figure: 1. Outer support leg; 2. Inner support leg; 3. Rack; 4. Cross-shaped locking mechanism; 5. Support frame; 6. First support rod; 7. Second support rod; 8. Support shaft; 9. First return spring; 10. Second return spring; 11. Adjustment handle; 12. Bracket; 13. Pull wire; 14. Connecting wire; 15. Connecting buckle; 16. Handle; 17. Tabletop; 18. Support base. DETAILED DESCRIPTION

[0032] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0033] See also Figure 1 、 Figure 2 and Figure 3 The present invention provides a table and chair lifting device that is easy to adjust the height, comprising a pair of outer supporting legs 1, a pair of inner supporting legs 2, a pair of racks 3, and a cross-shaped locking mechanism 4;

[0034] The inner support leg 2 is mounted in the outer support leg 1 and can be raised and lowered in height. The outer support leg 1 is fixedly connected to the cross-shaped locking mechanism 4. A pair of racks 3 are arranged opposite to each other on the inner side of the inner support leg 2. The cross-shaped locking mechanism 4 acts on the racks 3 and has two states: a first position and a second position.

[0035] The first working position is: when the cross-shaped locking mechanism 4 is disengaged from the rack 3, the cross-shaped locking mechanism 4 can be raised and lowered in the height direction, thereby driving the outer support leg 1 to move up and down;

[0036] The second working position is: when the cross-shaped locking mechanism 4 is engaged with the rack 3, the cross-shaped locking mechanism 4 and the outer supporting leg 1 are stabilized at a corresponding height.

[0037] As a preferred embodiment, the table and chair lifting device provided in this embodiment further includes a support frame 5. The outer support legs 1 are hollow on three sides, with the hollow surfaces of the left and right outer support legs 1 facing each other. The support frame 5 is fixedly connected to the left and right outer support legs 1. The cross-shaped locking mechanism 4 is fixedly connected to the support frame 5. The outer support legs 1 are hollow on three sides, and the rack 3 is fixed within the inner support leg 2.

[0038] As a preferred embodiment, the cross-shaped locking mechanism 4 of the table and chair lifting device provided in this embodiment includes first and second support rods and a support shaft 8; the centers of the two support rods are fixed to the support shaft 8 and can rotate around the support shaft 8, and the support shaft 8 is fixedly arranged on the support frame 5; it also includes first and second reset springs, one end of the first reset spring 9 is fixed to one end of the first support rod 6, and the other end of the first reset spring 9 is fixed to one end of the second support rod 7; one end of the second reset spring 10 is fixed to the other end of the second support rod 7, and the other end of the second reset spring 10 is fixed to the other end of the second support rod 7; when the first and second reset springs are stretched, the first and second support rods are disengaged from the rack 3; when the first and second reset springs are reset, the first and second support rods are engaged with the rack 3.

[0039] As a preferred embodiment, the table and chair lifting device provided in this embodiment also includes an adjusting handle 11, a bracket 12 and a pull wire 13; wherein, the bracket 12 is fixedly arranged in the outer support leg 1; the adjusting handle 11 is placed on the bracket 12, and the adjusting handle 11 can move up and down in the outer support leg 1; one end of the pull wire 13 is fixed on the adjusting handle 11, and the other end of the pull wire 13 is fixed on the cross-shaped locking mechanism 4, and the adjusting handle 11 moves up and down to drive the cross-shaped locking mechanism 4 to disengage from the rack 3 or engage with the rack 3 through the pull wire 13.

[0040] Preferably, this embodiment further includes a connecting line 14 and a connecting buckle 15, wherein

[0041] The connecting buckle 15 is sleeved on the connecting wire 14; one end of the connecting wire 14 is fixed to one end of the first support rod 6, and the other end of the connecting wire 14 is fixed to the other end of the second support rod 7; the other end of the pull wire 13 is fixed to the connecting buckle 15.

[0042] In order to facilitate the user to grasp the adjustment handle 11, the adjustment handle 11 in this embodiment is provided with an inwardly recessed handle 16. Alternatively, the adjustment handle 11 with three hollow sides is directly adopted, which is sleeved inside the left and right outer support legs 1 with the hollow sides facing outward.

[0043] When the present invention is in use, the adjustment handle 11 is pulled upwards, and then the pull wire 13 and the connecting wire 14 are pulled to drive the cross-shaped locking structure to rotate around the support shaft 8, so that the cross-shaped locking structure is separated from the rack 3, thereby adjusting the length of the inner support leg 2 in the outer support leg 1 and thus controlling the height of the table and chair; after adjusting to the required height, the adjustment handle 11 is released, and the cross-shaped locking structure engages with the rack 3 under the action of the reset spring to fix the height of the table and chair. After the adjustment is completed, the adjustment handle 11 is placed on the bracket 12.

[0044] This table and chair lifting device can be used on desks and chairs, computer tables, office desks or other tables and chairs that require height adjustment. It also provides a more perfect solution to the problem that the height of tables and chairs is not suitable but difficult to adjust, thus affecting comfort and vision.

[0045] like Figure 4 As shown, a second aspect of the present invention provides a height-adjustable table and chair, utilizing two sets of the aforementioned easily height-adjustable table and chair lifting devices; further comprising a tabletop 17 disposed on the upper end surfaces of the two sets of outer support legs 1. Alternatively, a seat may be disposed on the upper end surfaces of the two sets of outer support legs 1, and a backrest may be disposed on the seat to form a chair. Preferably, the height-adjustable table further comprises a support base 18, upon which the two sets of inner support legs 2 are disposed.

[0046] The invention has the advantages of convenience, speed, safety, reliability, simple structure, easy processing and manufacturing of required materials, low cost and strong practicality, and is a good alternative to existing table and chair height adjustment devices.

[0047] The present invention adopts the above technical solution, utilizing an adjustment handle 11 and a pull cord 13 to adjust the meshing position of the cross-shaped lock on the rack 3, thereby adjusting the height of the table and chair. After adjustment, a return spring secures the cross-shaped lock to the rack 3, thereby fixing the height of the table and chair. This invention allows for precise height adjustment of the table and chair without requiring reassembly, thereby ensuring user comfort. Its advantages include convenience, safety, reliability, simple structure, easy-to-process and manufacture materials, low cost, and high practicality.

[0048] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative 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.

Claims

1. A height-adjustable table and chair lifting device, characterized by: A pair of outer supporting legs, a pair of inner supporting legs, a pair of racks and a cross-shaped locking mechanism; wherein The outer supporting leg is sleeved in the inner supporting leg and can be raised and lowered in height; the outer supporting leg is fixedly connected to the cross-shaped locking mechanism; A pair of racks are oppositely arranged on the inner sides of the inner supporting legs; The cross-shaped locking mechanism acts on the rack and has two states: the first position and the second position: The first working position is: when the cross-shaped locking mechanism is disengaged from the rack, the cross-shaped locking mechanism can be raised and lowered in the height direction, thereby driving the outer support leg to move up and down; The second working position is: when the cross-shaped locking mechanism is engaged with the rack, the cross-shaped locking mechanism and the outer supporting legs are stabilized at a corresponding height; It also includes a support frame, wherein the outer support legs are three-sided hollow structures, and the hollow surfaces of the left and right outer support legs are arranged opposite to each other; the support frame is fixedly connected to the left and right outer support legs; the cross-shaped locking mechanism is fixedly connected to the support frame; The cross-shaped locking mechanism includes first and second support rods and a support shaft; in The centers of the two support rods are fixed to the support shaft and can rotate around the support shaft, and the support shaft is fixed on the support frame; It also includes a first and a second reset spring, one end of the first reset spring is fixed to one end of the first support rod, and the other end of the first reset spring is fixed to one end of the second support rod; One end of the second reset tension spring is fixed to the other end of the second support rod, and the other end of the second reset tension spring is fixed to the other end of the second support rod; When the first and second fixed reset tension springs are stretched, the first and second support rods are separated from the rack; When the first and second reset springs are fixed and reset, the first and second support rods are engaged with the rack; The first and second support rods rotate around the support shaft, separating the cross-shaped locking structure from the rack, thereby adjusting the length of the inner support leg within the outer support leg and thus controlling the height of the table and chair; the cross-shaped locking structure engages with the rack under the action of the reset spring to fix the height of the table and chair; Adjust the engagement position of the cross-shaped lock on the rack to adjust the height of the table and chair.

2. The height-adjustable table and chair lifting device according to claim 1, characterized in that: The outer supporting leg is a three-sided hollow structure, and the rack is fixed inside the inner supporting leg.

3. The height-adjustable table and chair lifting device according to claim 1, characterized in that: Also includes an adjustment handle, a bracket and a pull wire; The bracket is fixedly arranged in the outer supporting leg; the adjustment handle is placed on the bracket, and the adjustment handle can move up and down in the outer supporting leg; One end of the pull wire is fixed to the adjustment handle, and the other end of the pull wire is fixed to the cross-shaped locking mechanism. The adjustment handle moves up and down, driving the cross-shaped locking mechanism to disengage from the rack or engage with the rack through the pull wire.

4. The height-adjustable table and chair lifting device according to claim 3, characterized in that: Also includes connecting wires and connecting buckles, The connecting buckle is sleeved on the connecting line; One end of the connecting wire is fixed to one end of the first supporting rod, and the other end of the connecting wire is fixed to the other end of the second supporting rod; the other end of the pulling wire is fixed to the connecting buckle.

5. The height-adjustable table and chair lifting device according to claim 3, characterized in that: The adjusting handle is provided with a handle which is recessed inwards.

6. The height-adjustable table and chair lifting device according to claim 3, characterized in that: The adjustment handle is a three-sided hollow structure, which is sleeved inside the left and right outer supporting legs with the hollow side facing outwards.

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