Lifting and positioning structure of telescopic table legs

Abstract

A height-adjusting and positioning structure for a telescopic table leg includes: an outer tube; an inner tube rotatably extending into the outer tube and capable of rotating between a first angle and a second angle; and a positioning mechanism including a positioning part and a positioning rod; the positioning part is disposed on one side of the inner tube and includes a height-adjusting groove extending axially and a plurality of positioning grooves arranged vertically side by side and extending non-axially, wherein each positioning groove has a first end and a second end, the first end being away from the height-adjusting groove and the second end being connected to the height-adjusting groove; the positioning rod is radially inserted into the outer tube and passes through the positioning part; wherein, when the inner tube rotates to the first angle, the positioning rod moves to the first end of one of the positioning grooves of the positioning part, preventing the inner tube from moving axially up and down relative to the outer tube; when the inner tube rotates to the second angle, the positioning rod moves into the height-adjusting groove of the positioning part, allowing the inner tube to move axially up and down relative to the outer tube.

Description

Lifting and positioning structure of telescopic table legs Technical Field

[0001] This work relates to height-adjustable desks, specifically referring to a height-adjustable positioning structure for telescopic desk legs. Prior Technology

[0002] Note that height-adjustable desks are designed to provide users with adjustable working height to accommodate different sitting / standing postures. To achieve this height adjustment, common locking or unlocking methods for desk legs in existing technology include "pin-type" or "rotary-type." Pin-type designs typically have holes at different height positions on the desk legs, and a metal pin is inserted into these holes to fix the height. Rotary-type designs use a threaded mechanism to lock the inner and outer tubes of the desk legs to achieve a positioning effect. While these designs provide basic height adjustment and positioning functions, they still present several potential problems in practical use and safety.

[0003] First, the latch mechanism requires the latch to be pulled out during operation. In this state, if the user does not hold the tabletop or table legs, the table may suddenly slide down due to loss of support, posing a risk of pinching or damaging the equipment. In addition, because the height holes are fixed and the spacing is limited, users often have difficulty aligning them and cannot insert the latch smoothly, resulting in interruption of the height adjustment process and reduced efficiency.

[0004] Secondly, the rotating positioning structure relies on the friction and interlocking force of the threads to maintain the table legs' positioning. However, if the threads are not precise enough or wear down after prolonged use, the locking force may be insufficient, causing the table legs to slip and affecting safety. Furthermore, this type of mechanism requires users to repeatedly tighten and loosen it with a certain amount of force, which is difficult for those with insufficient hand strength (such as children or the elderly) and can cause fatigue.

[0005] Therefore, how to provide a lifting and positioning structure that combines stability, ease of operation, and positioning accuracy has become one of the important technical challenges in the field of height-adjustable desks. Summary of the Invention

[0006] The main purpose of this invention is to provide a height adjustment and positioning structure for telescopic table legs, which allows for simple and quick height adjustment and has a positioning function to prevent the table legs from becoming loose and tilting.

[0007] To achieve the aforementioned creative objective, this invention discloses a height-adjusting and positioning structure for a telescopic table leg, comprising: an outer tube; an inner tube rotatably extending into the outer tube and capable of rotating between a first angle and a second angle; and a positioning mechanism comprising a positioning part and a positioning rod; the positioning part is disposed on one side of the inner tube and includes a lifting groove extending axially, and a plurality of positioning grooves arranged vertically side by side and extending non-axially, wherein each positioning groove has a first end and a second end, the first end being away from the lifting groove, and the second end being connected to the lifting groove; the positioning rod is radially inserted into the outer tube and passes through the positioning part; wherein, when the inner tube rotates to the first angle, the positioning rod moves to the first end of one of the positioning grooves of the positioning part, preventing the inner tube from moving axially up and down relative to the outer tube; when the inner tube rotates to the second angle, the positioning rod moves into the lifting groove of the positioning part, allowing the inner tube to move axially up and down relative to the outer tube.

[0008] In one embodiment, each of the positioning grooves is inclinedly disposed around the circumference of the inner tube, such that there is an angle between the positioning groove and the lifting groove that is not equal to 90 degrees.

[0009] In one embodiment, the height of the first end of the positioning groove is higher than the height of the second end.

[0010] In one embodiment, the positioning mechanism further includes a pull pin and a plurality of pull pin holes; the pull pin is located on one side of the outer tube and can be operated to move in a direction approaching or away from the inner tube; the pull pin holes are arranged vertically along the axial direction on one side of the inner tube for inserting the pull pin.

[0011] In one embodiment, the number of pull pin holes corresponds to the number of positioning slots, such that when the pull pin is inserted into any of the pull pin holes, the positioning rod passes through the corresponding positioning slot.

[0012] In one embodiment, the distance between any two adjacent pull pin holes is equal to the distance between any two adjacent positioning slots.

[0013] In one embodiment, when the inner tube is at the first angle, the positioning rod is located at the first end of one of the positioning grooves, and one of the corresponding pull pin holes corresponds to the pull pin, so that the pull pin can extend into or leave the pull pin hole.

[0014] In one embodiment, when the inner tube is at the second angle, the positioning rod is located in the lifting groove, and the pull pin holes are misaligned with the pull pin, so that the pull pin cannot be inserted into any of the pull pin holes.

[0015] In one embodiment, the positioning mechanism includes two positioning parts, which are respectively disposed on opposite sides of the inner tube.

[0016] In one embodiment, each of the two positioning parts has the lifting groove and a plurality of positioning grooves, and the two lifting grooves and the positioning grooves of the two positioning parts are symmetrically arranged, so that the positioning rod simultaneously passes through the two lifting grooves of the two positioning parts or any two positioning grooves at the same height of the two positioning parts.

[0017] Based on the purpose and effect of this invention, the following are preferred embodiments, and detailed descriptions are provided with reference to the accompanying drawings. Simple Explanation of the Diagram

[0018] Figure 1 is a perspective view of a preferred embodiment of the present invention. Figure 2 is an exploded view of a preferred embodiment of the present invention. Figure 3 is a cross-sectional view of a preferred embodiment of the present invention. Figures 4 to 7 are schematic diagrams illustrating the lifting and lowering motion of a preferred embodiment of the present invention. Implementation

[0019] The following descriptions with reference to the various drawings are preferred embodiments of this invention. It should be understood that these drawings and descriptions are for illustrative purposes only and are not intended to limit this invention. Furthermore, the terms "upper" and "lower," "left" and "right," "front" and "back," "first" and "second," etc., used in the specification are used to clearly explain the relative positions between elements or mechanisms and are not intended to be limiting.

[0020] Please refer to Figures 1 to 3. The telescopic table leg provided in one preferred embodiment of this invention mainly comprises: an outer tube 10, an inner tube 20, and a positioning mechanism. Wherein:

[0021] In this embodiment, the outer tube 10 is a hollow circular tube with a generally circular cross-section. The top end of the outer tube 10 is an open end, and the bottom end is used to contact the ground. Two oppositely arranged through holes 11 are provided on both sides of the middle position of the outer tube 10.

[0022] In this embodiment, the inner tube 20 is a hollow circular tube with a generally circular cross-section, and the outer diameter of the inner tube 20 is smaller than the outer diameter of the outer tube 10. One end of the inner tube 20 is connected to the tabletop, and the other end is rotatably inserted into the outer tube 10, and can be operated to rotate between a first angle and a second angle.

[0023] The positioning mechanism is used to switch the outer tube 10 and the inner tube 20 between a positioned state and an unlocked state. When switched to the positioned state, the inner tube 20 cannot extend or retract relative to the outer tube 10; when switched to the unlocked state, the inner tube 20 can extend or retract relative to the outer tube 10. Specifically, the positioning mechanism includes a pull pin 30, a plurality of pull pin holes 40, two positioning parts 50, and a positioning rod 60. The pull pin 30 is movably disposed on one side of the outer tube 10 and perpendicular to the outer tube 10, with one end extending into the interior of the outer tube 10 and adjacent to the inner tube 20. The pull pin 30 can be operated to move in a direction approaching or away from the inner tube 20. The pull pin holes 40 are disposed on one side of the inner tube 20 and arranged vertically along the axial direction for the insertion of the pull pin 30. The inner tube 20 includes a plurality of scales 21 located above each of the pull pin holes 40, allowing the user to check whether the telescopic table legs have been extended to the designated height.

[0024] The two positioning parts 50 are disposed opposite to each other on both sides of the inner tube 20. Each positioning part 50 includes a lifting groove 51 extending axially and a plurality of positioning grooves 52 arranged side by side vertically and extending non-axially. Each positioning groove 52 has a first end 521 and a second end 522. The first end 521 is away from the lifting groove 51, and the second end 522 is connected to the lifting groove 51.

[0025] The positioning rod 60 is a thin rod, the length of which corresponds to the diameter of the outer tube 10. The positioning rod 60 is radially inserted into the outer tube 10 along the two through holes 11 and passes through the lifting groove 51 or the positioning groove 52 of the positioning part 50. Thus, the positioning rod 60 moves synchronously with the outer tube 10, and when the inner tube 20 rotates relative to the outer tube 10, the positioning rod 60 also rotates relative to the inner tube 20, thereby adjusting the position of the positioning rod 60 within the positioning part 50.

[0026] In this embodiment, the height of the first end 521 of each positioning groove 52 is higher than the height of the second end 522, so that the positioning groove 52 is inclined relative to the horizontal direction. Since the first end 521 of the positioning groove 52 is higher than the second end 522, this inclination will allow the positioning rod 60 to be positioned when it is inserted into the first end 521 of the positioning groove 52, preventing it from sliding easily, thereby ensuring that the telescopic table leg can also be stable and not rotate.

[0027] In this embodiment, the two lifting grooves 51 and the positioning grooves 52 of the two positioning parts 50 are symmetrically arranged, so that the positioning rod 60 simultaneously passes through the two lifting grooves 51 of the two positioning parts 50 or any two positioning grooves 52 at the same height of the two positioning parts 50.

[0028] In this embodiment, the number of pull pin holes 40 corresponds to the number of positioning slots 52, and the distance between any two adjacent pull pin holes 40 is equal to the distance between any two adjacent positioning slots 52. Thus, when the pull pin 30 is inserted into any of the pull pin holes 40, the positioning rod 60 passes through the corresponding positioning slot 52.

[0029] Based on the above structural configuration, please refer to Figures 4 to 7. The actual lifting and positioning process of the telescopic table leg lifting and positioning structure provided in this invention is as follows:

[0030] The inner tube 20 can be operated by the user to rotate relative to the outer tube 10 between the first angle and the second angle. Under normal conditions, when the inner tube 20 is at the first angle, the positioning rod 60 moves to the first end 521 of one of the positioning grooves 52 of the positioning part 50, and the pull pin 30 is inserted into the corresponding pull pin hole 40, so that the inner tube 20 cannot move up and down axially relative to the outer tube 10.

[0031] When a user wants to adjust the height of the telescopic table legs, the user must first pull the pin 30 outwards to disengage it from the pin hole 40, and then slightly rotate the pin 30 to secure it in the extended position. Next, the user can rotate the inner tube 20 from the first angle to the second angle. During this rotation, the positioning rod 60 moves relative to the positioning groove 52 from the first end 521 to the second end 522, and the pin holes 40 also become misaligned with the pin 30 as the inner tube 20 rotates, preventing the pin 30 from entering any of the pin holes 40 during subsequent raising and lowering.

[0032] When the user rotates the inner tube 20 to the second angle, the positioning rod 60 also moves from the positioning groove 52 into the lifting groove 51, no longer blocked by the positioning groove 52, and can move up and down along the lifting groove 51. The extension direction of the lifting groove 51 corresponds to the axial direction of the inner tube 20 / outer tube 10. In this way, the inner tube 20 can move up and down relative to the outer tube 10 along the axial direction, thereby adjusting the height of the telescopic table leg.

[0033] Once the user moves the inner tube 20 up and down to the desired height, the user can rotate the inner tube 20 back from the second angle to the first angle, causing the positioning rod 60 to move from the lifting groove 51 to the first end 521 of the positioning groove 52 at the corresponding height, thus fixing the inner tube 20 and preventing it from moving up and down axially relative to the outer tube 10. Next, the user slightly rotates the pull pin 30 to release it from the pulled-out state, and moves the pull pin 30 back towards the outer tube 10 and inserts it into the pull pin hole 40 at the corresponding height, thus completing the height adjustment of the telescopic table leg.

[0034] In summary, the height adjustment and positioning structure of the telescopic table legs provided in this invention, through the design of the positioning part 50 and the positioning rod 60 of the positioning mechanism, can realize the unlocked state and the positioning state respectively by rotation. In addition to being able to quickly adjust the height in the unlocked state, it can also provide a stable positioning function when adjusted to the positioning state, effectively avoiding the problem of injury caused by accidental loosening of the inner and outer tubes.

[0035] The above are preferred embodiments and design drawings of this invention. However, the preferred embodiments and design drawings are merely illustrative examples and are not intended to limit the scope of the invention. Any implementation using equivalent technical means or within the scope of the claims covered by the "Plaintiff's Claims" below does not depart from the scope of this invention and is within the scope of the applicant's rights.

[0036] 10: External pipe 11: Through hole 20: Inner tube 21: Scale 30: Pull pin 40: Pull pin hole 50: Positioning Department 51: Lifting trough 52: Positioning slot 521: First end 522: Second end 60: Positioning rod

Claims

1. A height-adjusting and positioning structure for a telescopic table leg, comprising: an outer tube; an inner tube rotatably extending into the outer tube and rotatable between a first angle and a second angle; and a positioning mechanism comprising a positioning part and a positioning rod; the positioning part being disposed on one side of the inner tube, comprising a lifting groove extending axially, and a plurality of positioning grooves arranged vertically side-by-side and extending non-axially, wherein each positioning groove has a first end and a second end, the first end being away from the lifting groove, and the second end being connected to the lifting groove; the positioning rod being radially inserted into the outer tube and passing through the positioning part; wherein... When the inner tube rotates to the first angle, the positioning rod moves to the first end of one of the positioning grooves of the positioning part, so that the inner tube cannot move up and down relative to the outer tube in the axial direction; when the inner tube rotates to the second angle, the positioning rod moves to the lifting groove of the positioning part, so that the inner tube can move up and down relative to the outer tube in the axial direction.

2. The lifting and positioning structure of the telescopic table leg as described in claim 1, wherein each of the positioning grooves is inclinedly disposed in the circumference of the inner tube, such that the positioning groove and the lifting groove are at an angle not equal to 90 degrees.

3. The lifting and positioning structure of the telescopic table leg as described in claim 2, wherein the height of the first end of the positioning groove is higher than the height of the second end.

4. The lifting and positioning structure of the telescopic table leg as described in claim 1, wherein the positioning mechanism further includes a pull pin and a plurality of pull pin holes; the pull pin is located on one side of the outer tube and can be operated to move in a direction approaching or away from the inner tube; the pull pin holes are arranged vertically along the axial direction on one side of the inner tube for inserting the pull pin.

5. The lifting and positioning structure of the telescopic table leg as described in claim 4, wherein the number of the pull pin holes corresponds to the number of the positioning slots, such that when the pull pin is inserted into any of the pull pin holes, the positioning rod passes through the corresponding positioning slot.

6. The lifting and positioning structure of the telescopic table leg as described in claim 4, wherein the distance between any two adjacent pull pin holes is equal to the distance between any two adjacent positioning slots.

7. The lifting and positioning structure of the telescopic table leg as described in claim 4, wherein when the inner tube is at the first angle, the positioning rod is located at the first end of one of the positioning grooves, and one of the corresponding pull pin holes corresponds to the pull pin, so that the pull pin can extend into or leave the pull pin hole.

8. The lifting and positioning structure of the telescopic table leg as described in claim 4, wherein when the inner tube is at the second angle, the positioning rod is located in the lifting groove, and the pull pin holes are misaligned with the pull pin, so that the pull pin cannot be inserted into any of the pull pin holes.

9. The lifting and positioning structure of the telescopic table leg as described in claim 1, wherein the positioning mechanism includes two positioning parts, respectively disposed on opposite sides of the inner tube.

10. The lifting and positioning structure of the telescopic table leg as described in claim 9, wherein each of the two positioning parts has the lifting groove and a plurality of the positioning grooves, and the two lifting grooves and the positioning grooves of the two positioning parts are symmetrically arranged, such that the positioning rod simultaneously passes through the two lifting grooves of the two positioning parts or any two positioning grooves at the same height of the two positioning parts.

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