Locking mechanism and desk and chair

Abstract

The utility model relates to the technical field of human life necessities, and provides a locking mechanism and a desk and chair, the locking mechanism comprises a telescopic piece and a locking piece, the telescopic piece comprises a sleeve and an inner rod movably sleeved on the sleeve, and the inner rod is provided with at least one lock hole; the locking piece is arranged at the connecting end of the sleeve, the locking piece comprises a lock sleeve with an opening and a lock handle for driving the opening of the lock sleeve to be closed and locked or separated and unlocked, at least one fixing hole is formed in the lock sleeve, and a lock pin piece which is inserted into the lock hole to be locked or separated and unlocked is arranged on the fixing hole; and when the handle part of the lock handle is arranged on the lock sleeve in an embracing manner, the handle part seals the fixing hole. The lock pin piece is inserted in a counterpoint mode to achieve height adjustment, then the lock handle is rotated to hoop the inner rod, so that height adjustment and counterpoint are more accurate and easier, the stability of height fixing of the desk and chair is improved, operation is convenient and fast, and compared with a spring pin arranged in a sleeve, the overall structure can be more compact.

Description

Technical Field

[0001] This utility model relates to the technical field essential to human life, specifically to a locking mechanism and a school desk and chair. Background Technology

[0002] As common items in daily office and study settings, the comfort of desks and chairs directly affects the user experience. By designing an adjustable telescopic mechanism, the height of the desks and chairs can be adjusted according to different heights and usage scenarios, thereby providing users with a more comfortable user experience.

[0003] Existing desks and chairs typically adjust the height of the legs by using an inner tube and an outer tube. Generally, a spring pin is installed in the inner tube, and a row of limit holes is set on the outer tube. Users need to manually press the spring pin and repeat the operation until the spring pin is correctly engaged in the required limit hole position to achieve height adjustment. Afterwards, additional fasteners (such as bolts) are needed to fix the position of the inner and outer tubes, making the operation very cumbersome. Utility Model Content

[0004] The purpose of this utility model is to provide a locking mechanism and a desk and chair to improve the problem of the cumbersome height adjustment of existing desks and chairs.

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

[0006] A locking mechanism, comprising:

[0007] A telescopic component, comprising a sleeve and an inner rod movably sleeved on the sleeve, the inner rod having at least one locking hole; and

[0008] A locking component is provided on the connecting end of the sleeve. The locking component includes a lock sleeve with an opening and a lock handle that drives the opening of the lock sleeve to close for locking or to unlock. The lock sleeve is provided with at least one fixing hole, and a locking pin is provided on the fixing hole to be inserted into the lock hole for locking or to unlock.

[0009] When the handle portion of the lock handle is fitted onto the lock sleeve, the handle portion closes the fixing hole.

[0010] Preferably, it further includes a bushing, the bushing having a central through hole extending through both ends, one end of the bushing having an insertion part for connecting with the sleeve, and the other end of the bushing having a locking part; the locking sleeve is fitted over the locking part;

[0011] The lock sleeve is provided with a first fastening part, and the locking part is provided with a second fastening part that engages with the first fastening part.

[0012] Preferably, the locking sleeve has symmetrically arranged protrusions at the opening;

[0013] The locking end of the lock handle is provided with an eccentric wheel that abuts against one of the protrusions, and a locking rod that passes through the two protrusions and is connected to the shaft of the eccentric wheel. The other end of the locking rod is provided with a limiting part that abuts against another protrusion.

[0014] Preferably, the end of the lock handle is provided with a finger groove.

[0015] Preferably, the inner surface of the bushing is provided with a plurality of guide protrusions spaced apart, and the sleeve is provided with a groove that engages with the guide protrusions.

[0016] Preferably, the plug portion is provided with at least one first open-loop groove.

[0017] Preferably, the locking part is provided with at least one second open-loop groove.

[0018] Preferably, the lock handle has an arc-shaped structure.

[0019] Preferably, a plurality of raised ribs are provided at intervals on the inner and / or outer surfaces of the insertion part.

[0020] A desk and chair are also provided, including the aforementioned locking mechanism.

[0021] By adopting the above technical solution, this utility model has the following advantages compared with the prior art:

[0022] 1. In this utility model, a locking pin is provided on the locking part to connect with the locking hole of the inner rod. The height is adjusted by first aligning and inserting the locking pin, and then rotating the locking handle to tighten the inner rod. This makes the height adjustment more accurate and easier, and improves the stability of the fixed height of the desk and chair, making the operation convenient.

[0023] 2. This utility model achieves height adjustment of table legs or chair legs by setting a locking pin on the locking part. Compared with setting a spring pin in the sleeve, it can effectively reduce the size of table legs and chair legs, making the overall structure more compact. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the bushing and locking component described in this utility model;

[0025] Figure 2 This is another structural schematic diagram of the bushing and locking component described in this utility model;

[0026] Figure 3 This is a disassembly diagram of the bushing and locking component described in this utility model;

[0027] Figure 4 This is a schematic diagram of the locking mechanism described in this utility model installed on a school desk;

[0028] Figure 5 This is a cross-sectional view of the locking mechanism described in this utility model;

[0029] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle.

[0030] Explanation of reference numerals in the attached figures:

[0031] 10. Telescopic component; 101. Sleeve; 1011. Slot; 102. Inner rod; 1021. Locking hole;

[0032] 11. Bushing; 111. Insertion part; 1111. Rib; 1112. First open annular groove;

[0033] 112. Locking part; 1121. Second open-ring groove; 1122. Second engaging part; 113. Guide protrusion;

[0034] 12. Locking component; 121. Lock sleeve; 1211. First engaging part; 1212. Locking pin;

[0035] 1213, protrusion; 1214, opening; 1215, fixing hole; 122, lock handle; 1221, eccentric wheel; 1222, lock rod; 12221, limiting part; 1223, finger groove. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0037] Additionally, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are all based on the orientation or positional relationship shown in the accompanying drawings. They are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element of this utility model must have a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] When an element is referred to as being "fixed to," "set on," or "contained on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to," it can be directly connected to or indirectly connected to that other element.

[0039] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] Example 1

[0041] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, this embodiment provides a locking mechanism, including a telescopic member 10, a bushing 11, and a locking member 12. The telescopic member 10 includes a sleeve 101 and an inner rod 102 movably sleeved on the sleeve 101. The inner rod 102 is provided with at least one lock hole 1021. The bushing 11 is provided with a central through hole penetrating both ends. One end of the bushing 11 is provided with an insertion part 111, and the other end of the bushing 11 is provided with a locking part 112. The locking member 12 includes a lock sleeve 121 with an opening 1214 and a lock handle 122 that drives the opening 1214 of the lock sleeve 121 to close for locking or to unlock. The lock sleeve 121 is provided with a first fastening part 1211 and a locking pin 1212 that is inserted into the lock hole 1021 for locking or to unlock. The locking part 112 is provided with a second fastening part 1122 that is locked with the first fastening part 1211.

[0042] Specifically, the telescopic component 10 can be a table leg or chair leg of a school desk or chair, and its height can be adjusted by sliding the inner rod 102 along the sleeve 101. The insertion part 111 at one end of the bushing 11 is inserted into the sleeve 101, and the locking part 112 at the other end of the bushing 11 is sleeved on the outer side of the inner rod 102. The central through hole is used for the inner rod 102 to pass through, so that the bushing 11 is fixedly installed at the connection position between the inner rod 102 and the sleeve 101. The lock sleeve 121 is provided with a fixing hole 1215 for the locking pin 1212 to pass through. When adjusting the height of the desk and chair, adjust the position of the inner rod 102 until the fixing hole 1215 is aligned with the desired lock hole 1021. Then, insert the locking pin 1212 into the fixing hole 1215 and the lock hole 1021. Finally, rotate the lock handle 122 to cover the lock sleeve 121. When the handle of the lock handle 122 is engaged with the lock sleeve 121, the handle closes the fixing hole 1215, thereby fixing the locking pin 1212 and preventing it from falling off. There can be two fixing holes 1215, which are arranged opposite each other on both sides of the lock sleeve 121. The locking pin 1212 passes through the fixing holes 1215 on both sides (e.g., ...). Figure 6As shown in the diagram, this increases the number of stress points and improves stability. Under the action of the lock handle 122, the long axis of the lock sleeve 121 shortens, and the opening 1214 gradually closes, thereby tightening the inner rod 102 and locking its position to ensure the stability of the desk and chair height. Conversely, when the height needs to be adjusted, simply rotate the lock handle 122 in the opposite direction to open the opening 1214 of the lock sleeve 121, loosening the tightening force on the inner rod 102. Then, the lock pin 1212 can be removed, and the inner rod 102 can slide freely within the sleeve 101, allowing for a new lock hole 1021 to be selected for locking.

[0043] This simplifies the steps of adjusting the height of the desks and chairs. First, insert the locking pin 1212 and then engage the locking handle 122, making the alignment more precise and easier, and the operation more convenient. Multiple fixing holes 1215 and locking pins 1212 can be provided to distribute the force points and improve stability.

[0044] In this embodiment, the lock sleeve 121 is symmetrically provided with protrusions 1213 at the opening 1214; the locking end of the lock handle 122 is provided with an eccentric wheel 1221 that abuts against one of the protrusions 1213, and a locking rod 1222 that passes through the two protrusions 1213 and is connected to the shaft of the eccentric wheel 1221 at one end, and a limiting part 12221 that abuts against another protrusion 1213 is provided on the other end of the locking rod 1222.

[0045] Specifically, the lock handle 122 rotates around the eccentric wheel 1221, thereby covering the lock sleeve 121 and shortening the long axis of the lock sleeve 121. The opening 1214 gradually closes, tightening the inner rod 102. The lock rod 1222 is used to connect the lock handle 122 and the lock sleeve 121. The locking end of the lock handle 122 is also provided with a clearance for avoiding the lock rod 1222, so as to facilitate the smooth rotation of the lock handle 122 and avoid interference from the lock rod 1222.

[0046] In this embodiment, a finger groove 1223 is provided at the end of the lock handle 122. The finger groove 1223 is recessed at the end of the lock handle 122 so that when the lock handle 122 covers the lock sleeve 121 for locking, there is a certain gap between the finger groove 1223 and the lock sleeve 121, allowing the hand to reach in and pry the lock handle 122 to facilitate unlocking the lock handle 122.

[0047] In this embodiment, multiple pairs of first fastening parts 1211 and second fastening parts 1122 are provided at intervals. The locking sleeve 121 is engaged with the second fastening part 1122 of the locking part 112 through the first fastening part 1211, thereby realizing a self-locking connection and improving the stability of the self-locking connection between the locking sleeve 121 and the bushing 11.

[0048] In this embodiment, the inner surface of the bushing 11 is provided with a plurality of guide protrusions 113 at intervals, and the sleeve 101 is provided with a groove 1011 that engages with the guide protrusions 113. By engaging the guide protrusions 113 with the groove 1011, a self-locking connection is achieved between the bushing 11 and the sleeve 101, ensuring that the bushing 11 is not easily misaligned when installed on the connecting end of the sleeve 101. Furthermore, the guide protrusions 113 may be provided with guide slopes to facilitate the smooth insertion of the bushing 11 into the sleeve 101, thereby improving assembly efficiency.

[0049] In this embodiment, the insertion part 111 is provided with at least one first open-ring groove 1112. The locking part 112 is provided with at least one second open-ring groove 1121. The first open-ring groove 1112 provides space for deformation of the insertion part 111 so that the insertion part 111 can be smoothly inserted into the sleeve 101; the second open-ring groove 1121 provides space for deformation of the locking part 112. When the handle part of the lock handle 122 hugs the lock sleeve 121, the opening 1214 of the lock sleeve 121 gradually closes and the long axis shortens. At this time, the lock sleeve 121 applies a clamping force to the locking part 112, causing the locking part 112 to deform and clamp the inner rod 102.

[0050] Furthermore, a plurality of raised ribs 1111 are provided at intervals on the inner and / or outer surfaces of the insertion part 111. After the insertion part 111 is inserted into the sleeve 101, it is located between the sleeve 101 and the inner rod 102, and the inner rod 102 can slide along the central through hole of the bushing 11. The upper part of the bushing 11 is clamped to the inner rod 102 by the locking part 112, and the lower part is filled with the gap between the sleeve 101 and the inner rod 102 by the raised ribs 1111, thereby increasing the support points at the lower part, preventing the inner rod 102 from shaking when sliding, and improving stability.

[0051] In this embodiment, the lock handle 122 has an arc-shaped structure, and the cross-sections of the bushing 11 and the lock sleeve 121 can be circular or oblong to accommodate different table or chair leg shapes. That is, when the cross-section is circular, the position of the movable end of the handle 122 when it engages with the lock sleeve 121 should exceed the radius of the lock sleeve 121; when the cross-section is oblong, the position of the movable end of the handle should exceed half the length of the minor axis of the lock sleeve 121, so that the lock handle 122 can securely engage and tighten the lock sleeve 121.

[0052] Example 2

[0053] A school desk and chair is also provided, including the locking mechanism described in Embodiment 1. The telescopic member 10 is the table leg or chair leg of the school desk and chair. The locking mechanism simplifies the operation steps of adjusting the height of the school desk and chair, and improves the convenience and stability of use.

[0054] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A locking mechanism, characterized in that, include: A telescopic component, comprising a sleeve and an inner rod movably sleeved on the sleeve, wherein the inner rod is provided with at least one locking hole; and A locking component is provided on the connecting end of the sleeve. The locking component includes a lock sleeve with an opening and a lock handle that drives the opening of the lock sleeve to close for locking or to unlock. The lock sleeve is provided with at least one fixing hole, and a locking pin is provided on the fixing hole to be inserted into the lock hole for locking or to unlock. When the handle portion of the lock handle is fitted onto the lock sleeve, the handle portion closes the fixing hole.

2. The locking mechanism according to claim 1, characterized in that: It also includes a bushing, which has a central through hole extending through both ends. One end of the bushing has a plug-in portion for connecting with the sleeve, and the other end of the bushing has a locking portion. The locking sleeve is fitted over the locking portion. The lock sleeve is provided with a first fastening part, and the locking part is provided with a second fastening part that engages with the first fastening part.

3. The locking mechanism according to claim 1, characterized in that: The locking sleeve has symmetrical protrusions at the opening; The locking end of the lock handle is provided with an eccentric wheel that abuts against one of the protrusions, and a locking rod that passes through the two protrusions and is connected to the shaft of the eccentric wheel. The other end of the locking rod is provided with a limiting part that abuts against another protrusion.

4. The locking mechanism according to claim 1, characterized in that: The end of the lock handle is provided with a finger groove.

5. The locking mechanism according to claim 2, characterized in that: The inner surface of the bushing is provided with a plurality of guide protrusions spaced apart, and the sleeve is provided with a groove that engages with the guide protrusions.

6. The locking mechanism according to claim 2, characterized in that: The plug portion is provided with at least one first open-loop groove.

7. The locking mechanism according to claim 2 or 6, characterized in that: The locking part is provided with at least one second open-loop groove.

8. The locking mechanism according to claim 1, characterized in that: The lock handle has an arc-shaped structure.

9. The locking mechanism according to claim 2, characterized in that: The inner and / or outer surfaces of the insertion part are provided with a number of raised ribs at intervals.

10. A type of school desk and chair, characterized in that, Includes the locking mechanism as described in any one of claims 1-9.

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