A rotary interlock

Abstract

The utility model discloses a rotary inner lock, including screw rod, be equipped with nut buckle with screw thread connection on screw rod, and the narrow end of nut buckle is equipped with expansion contraction plastic part, and the other end of expansion contraction plastic part is movably inserted and is equipped with rotating block, and the one end of screw rod is fixedly equipped with light pole away from nut buckle, and the inside of expansion contraction plastic part is equipped with through -hole, and the one end of rotating block and expansion contraction plastic part insertion is equipped with round groove, and light pole passes through through -hole and extends to in round groove, the utility model discloses built -in structure, need not external lock, avoid destroying telescopic pole overall appearance simple and exquisite degree, through nut buckle extrusion expansion contraction plastic part and make the convex edge resist tight thick pole inner wall, and it is not easy to appear to slip when locking, utilize the friction of convex edge and thick pole inner wall, and the cooperation of spacing convex and spacing groove, ensure that only trigger screw rod rotation and nut buckle axial movement when rotating thin pole, do not drive nut buckle link shaft rotation, can realize effective lock.

Description

Technical Field

[0001] This utility model relates to the technical field of telescopic rod devices, specifically a rotary inner lock for fastening the thin and thick rods in a telescopic rod. Background Technology

[0002] Telescopic rods, as commonly used telescopic adjustment components, are widely used in furniture, machinery, and other fields. They mainly consist of a thin rod and a thick rod. The thin rod is inserted into the thick rod and can slide along the axis of the thick rod to achieve length adjustment. To fix the position of the thin rod after extension or retraction, a locking structure is usually installed at the connection between the thin rod and the thick rod.

[0003] Currently, the locking structures of telescopic poles on the market have obvious defects: some products still use an external lock design. This type of lock is exposed on the outside of the telescopic pole, which not only destroys the simplicity and beauty of the overall appearance, but also is prone to slippage due to structural loosening after long-term use, affecting the stability of use; other products use an old internal lock structure. In actual operation, when the thin rod is turned to trigger the lock, the entire internal lock component is easily driven to rotate synchronously with the thin rod, causing the internal lock to fail to form an effective clamp with the thick rod, thus failing to achieve reliable locking and failing to meet users' needs for the locking effect of telescopic poles. Utility Model Content

[0004] (I) Technical Issues

[0005] The present invention aims to provide a rotary inner lock to solve the problems of poor appearance, easy slippage, or easy rotation of the inner lock in existing telescopic rod locking structures, which prevents them from locking properly.

[0006] (II) Technical Content

[0007] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: a rotary internal lock, including a screw, a nut buckle threadedly connected to the screw, the nut buckle being frustoconical and having an internal threaded hole for the screw to pass through, an expansion and contraction plastic part sleeved on the narrow end of the nut buckle, a rotating block movably inserted into the other end of the expansion and contraction plastic part, a smooth rod fixedly provided at the end of the screw away from the nut buckle, a through hole provided inside the expansion and contraction plastic part, a circular groove provided at the end of the rotating block that is inserted into the expansion and contraction plastic part, the smooth rod passing through the through hole and extending into the circular groove, a limiting hole provided on the rotating block that penetrates the circular groove, a positioning hole provided at the end of the smooth rod that extends into the circular groove, the limiting hole and the positioning hole coinciding, and a limiting pin passing through the hole.

[0008] Furthermore, the outer side of the nut buckle is fixedly provided with multiple limiting protrusions, and the expansion and contraction plastic part is provided with multiple limiting grooves that are engaged with the limiting protrusions.

[0009] Furthermore, the surface of the expansion and contraction plastic part is integrally formed with several protruding ridges, and the outer side of the protruding ridges contacts the inner wall of the thick rod in the telescopic rod.

[0010] Furthermore, the optical rod passes through the through hole and is fitted with the through hole with a clearance, and the optical rod extends into the circular groove and is fitted with the circular groove with a clearance.

[0011] Furthermore, the diameter of the through hole is larger than the diameter of the optical rod but smaller than the diameter of the screw body.

[0012] Furthermore, the end of the expansion and contraction plastic part that is inserted into the rotating block is provided with a boss, and the end of the rotating block is provided with a groove for the boss to be inserted and clearance fit. The rotating block is fixedly connected to the thin rod in the telescopic rod.

[0013] (III) Technical Effects

[0014] Compared with the prior art, the advantages of this utility model are as follows: This rotary internal lock is a built-in structure, which eliminates the need for an external lock, thus avoiding damage to the overall simplicity and elegance of the telescopic rod and meeting the requirements of appearance design. By squeezing the expansion and contraction of the plastic part through the nut buckle, the protruding edge is pressed against the inner wall of the thick rod, making it less prone to slippage when locked. Compared with an external lock, it greatly improves the reliability of use. By utilizing the friction between the protruding edge and the inner wall of the thick rod, and the cooperation between the limiting protrusion and the limiting groove, it is ensured that when the thin rod is rotated, only the screw is triggered to rotate and the nut buckle moves axially, without driving the nut buckle to rotate through the shaft, thus achieving effective locking. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a rotary inner lock according to this utility model. Figure 1 .

[0016] Figure 2 This is a three-dimensional structural diagram of a rotary inner lock according to this utility model. Figure 2 .

[0017] Figure 3 This is a schematic diagram of the main structure of a rotary inner lock according to this utility model.

[0018] Figure 4 This is a top view schematic diagram of a rotary inner lock according to this utility model.

[0019] Figure 5 This is a cross-sectional structural diagram of a rotary inner lock according to this utility model.

[0020] Figure 6 This is a schematic diagram of the structure of a rotating block for a rotating internal lock according to this utility model.

[0021] Figure 7 This is a schematic diagram of the structure of a rotary internal locking expansion and contraction plastic part according to the present invention.

[0022] Figure 8 This is a schematic diagram of the structure of a nut buckle with a rotary internal lock according to this utility model.

[0023] Figure 9 This is a schematic diagram of the structure of a rotary internal locking screw according to this utility model.

[0024] Figure 10 This is a schematic diagram of the application of a rotary inner lock in a telescopic rod according to this utility model.

[0025] As shown in the figure: 1. Screw; 2. Nut clip; 3. Internal threaded hole; 4. Expanding and shrinking plastic part; 5. Rotating block; 6. Plain rod; 7. Through hole; 8. Circular groove; 9. Limiting hole; 10. Positioning hole; 11. Limiting pin; 12. Limiting protrusion; 13. Limiting groove; 14. Raised ridge; 15. Boss; 16. Groove; 17. Thin rod in the telescopic rod; 18. Thick rod in the telescopic rod. Detailed Implementation

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "center", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation structure and operation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "provided with," "installed," "connected," "linked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0028] The present invention will now be described in further detail with reference to the accompanying drawings.

[0029] Combined with appendix Figure 1 To be continued Figure 10A rotary internal lock includes a screw 1, a nut clip 2 threadedly connected to the screw 1, the nut clip 2 being frustoconical and having an internal threaded hole 3 for the screw 1 to pass through, an expansion and contraction plastic part 4 sleeved on the narrow end of the nut clip 2, a rotating block 5 movably inserted into the other end of the expansion and contraction plastic part 4, a smooth rod 6 fixedly provided at the end of the screw 1 away from the nut clip 2, a through hole 7 provided inside the expansion and contraction plastic part 4, a circular groove 8 provided at the end of the rotating block 5 that is inserted into the expansion and contraction plastic part 4, the smooth rod 6 passing through the through hole 7 and extending into the circular groove 8, a limiting hole 9 penetrating the circular groove 8 on the rotating block 5, a positioning hole 10 provided at the end of the smooth rod 6 extending into the circular groove 8, the limiting hole 9 and the positioning hole 10 coinciding, and a limiting pin 11 passing through the latter.

[0030] In this embodiment, as a preferred technical solution, the outer side of the nut buckle 2 is fixedly provided with multiple limiting protrusions 12, the expansion and contraction plastic part 4 is provided with multiple limiting grooves 13 that are corresponding to and engage with the limiting protrusions 12, the surface of the expansion and contraction plastic part 4 is integrally formed with a number of protruding ridges 14, the outer side of the protruding ridges 14 contacts the inner wall of the thick rod in the telescopic rod, the end of the expansion and contraction plastic part 4 that is inserted into the rotating block 5 is provided with a boss 15, the end of the rotating block 5 is provided with a groove 16 for the boss 15 to be inserted and clearance fit, and the rotating block 5 is fixedly connected to the thin rod in the telescopic rod.

[0031] In this embodiment, as a preferred technical solution, the optical rod 6 passes through the through hole 7 and is clearance-fitted with the through hole 7, the optical rod 6 extends into the circular groove 8 and is clearance-fitted with the circular groove 8, and the diameter of the through hole 7 is larger than the diameter of the optical rod 6 and smaller than the diameter of the screw 1 body.

[0032] The assembly method of this device is as follows: First, insert the screw 1 into the thick end of the nut clip 2 and connect it with the thread. Then, pass the light rod 6 through the expansion and contraction plastic part 4 and extend it out from the through hole 7. The limiting groove 13 of the expansion and contraction plastic part 4 is locked on the limiting protrusion 12. Then, insert the rotating block 5 into the end of the expansion and contraction plastic part 4 and insert the light rod 6 into the circular groove 8. Then, rotate the rotating block 5 to make the limiting hole 9 and the positioning hole 10 coincide. Finally, insert the limiting pin 11 to complete the assembly of the internal lock.

[0033] The working principle of this utility model is as follows:

[0034] 1. After completing the internal lock assembly, fix the rotating block 5 to the thin rod 17 of the telescopic rod (interference fit, bonding, or welding), and then insert the entire internal lock along with the end of the thin rod into the thick rod 18 of the telescopic rod, as shown. Figure 10 At this time, the protruding ridge 14 on the surface of the expanding and contracting plastic part 4 contacts the inner wall of the thick rod. Since the length direction of the protruding ridge 14 is parallel to the thick rod, the friction is small when the thin rod extends and contracts axially, and the length can be freely adjusted by applying a slight force; while when the thin rod rotates radially, the friction between the protruding ridge 14 and the inner wall of the thick rod is large, which can prevent the expanding and contracting plastic part 4 from rotating with it.

[0035] 2. When it is necessary to fix the position of the thin rod, rotate the thin rod 17, which drives the rotating block 5 fixed thereto to rotate synchronously. Under the connection of the limiting pin 11, the rotating block 5 drives the smooth rod 6 and the integrated screw 1 to rotate. Due to the friction between the protruding rib 14 and the inner wall of the thick rod, the expanding and contracting plastic part 4 does not rotate with it, and the nut buckle 2 is engaged with the limiting groove 13 of the expanding and contracting plastic part 4 through the limiting protrusion 12, and cannot rotate with the screw 1, but can only move along the axial direction of the screw 1. Finally, the frustum-shaped nut buckle 2 moves toward the expanding and contracting plastic part 4 and squeezes it to expand outward, so that the protruding rib 14 tightly abuts against the inner wall of the thick rod, increasing the friction, thereby fixing the telescopic position of the thin rod.

[0036] 3. When unlocking is required, rotate the thin rod in the opposite direction, causing the rotating block 5, the limiting pin 11, the smooth rod 6, and the screw 1 to rotate in the opposite direction. The nut buckle 2 moves in the opposite direction along the axial direction of the screw 1, releasing the pressure on the expanding and contracting plastic part 4. The expanding and contracting plastic part 4 returns to its original shape, the pressure between the protruding ridge 14 and the inner wall of the thick rod disappears, the friction decreases, and the thin rod can freely extend and retract again.

[0037] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A rotary inner lock, comprising a screw (1), wherein a nut latch (2) is threadedly connected to the screw (1), characterized in that: The nut clip (2) is frustum-shaped and has an internal threaded hole (3) through which the screw (1) passes. The narrow end of the nut clip (2) is fitted with an expansion and contraction plastic part (4). The other end of the expansion and contraction plastic part (4) is movably inserted with a rotating block (5). The end of the screw (1) away from the nut clip (2) is fixed with a smooth rod (6). The expansion and contraction plastic part (4) has a through hole (7). The end of the rotating block (5) that is inserted into the expansion and contraction plastic part (4) has a circular groove (8). The smooth rod (6) passes through the through hole (7) and extends into the circular groove (8). The rotating block (5) has a limiting hole (9) that penetrates the circular groove (8). The end of the smooth rod (6) that extends into the circular groove (8) has a positioning hole (10). The limiting hole (9) and the positioning hole (10) coincide and a limiting pin (11) passes through them.

2. A rotary inner lock according to claim 1, characterized in that: The outer side of the nut buckle (2) is fixed with multiple limiting protrusions (12), and the expansion and contraction plastic part (4) is provided with multiple limiting grooves (13) that are corresponding to the limiting protrusions (12) and engage with them.

3. A rotary inner lock according to claim 2, characterized in that: The expansion and contraction plastic part (4) has several protruding ridges (14) integrally formed on its surface, and the outer side of the protruding ridges (14) contacts the inner wall of the thick rod in the telescopic rod.

4. A rotary inner lock according to claim 1, characterized in that: The light rod (6) passes through the through hole (7) and is in clearance fit with the through hole (7). The light rod (6) extends into the circular groove (8) and is in clearance fit with the circular groove (8).

5. A rotary inner lock according to claim 4, characterized in that: The diameter of the through hole (7) is greater than the diameter of the smooth rod (6) and less than the diameter of the main body of the screw (1).

6. A rotary inner lock according to claim 3, characterized in that: The end of the expansion and contraction plastic part (4) that is inserted into the rotating block (5) is provided with a boss (15), and the end of the rotating block (5) is provided with a groove (16) for the boss (15) to be inserted and fit with clearance. The rotating block (5) is fixedly connected to the thin rod in the telescopic rod.

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