Rotary locking type telescopic pull rod and equipment comprising same

Abstract

The utility model discloses a rotary locking type telescopic pull rod and equipment comprising the same, relates to the technical field of telescopic pull rod structures, and is particularly suitable for equipment such as a draw-bar box and a camping car. According to the pull rod, the taper sleeve opening and locking structure is arranged at the tail of the inner pipe and matched with the bolt, the taper sleeve and the locking sleeve, so that stepless adjustment and locking during relative rotation of the inner pipe and the outer pipe are achieved. Meanwhile, through a limiting nut of the inner pipe and a protrusion in the outer pipe, rotation movement is conducted to the next section, and locking or loosening of the multiple sections of the pull rod is achieved. The telescopic pull rod has the characteristics of simple structure, convenience in operation, high reliability and strong expansibility, can effectively improve the user experience and reduce the production cost, and is suitable for various scenes needing the telescopic pull rod.

Description

Technical Field

[0001] This utility model relates to a telescopic pull rod structure, and more particularly to a pull rod that can be rotated to lock and release, and a device containing the same. It is particularly suitable for pull rods of suitcases and campervans. One end of the pull rod is fixed, and the device can achieve stable locking or release and free extension by rotating the other end with one hand. Background Technology

[0002] The limitations of traditional pull rods include:

[0003] 1. Inflexible adjustment: It relies on fixed segment nodes and cannot achieve infinite scaling;

[0004] 2. Complex structure: It uses multiple sets of spring clips, which results in high assembly costs and easy wear and failure.

[0005] 3. Low reliability: Locking stability decreases significantly with component wear.

[0006] Based on this, the present invention proposes a rotary locking rod with simplified structure, convenient operation, easy production and assembly, and support for multi-level linkage, as well as a device containing the rod. Utility Model Content

[0007] A rotary locking or unlocking pull rod and a device comprising the same are provided. The radial expansion locking is driven by the axial displacement of the tapered sleeve and the locking sleeve, achieving stepless adjustment and stable limiting. The multi-section rotational motion is transmitted through the interlocking of the outer tube and the locking sleeve, achieving multi-section locking or unlocking. At the same time, the structure is simplified for easy manufacturing and processing, and the reliability and ease of use of the pull rod are improved.

[0008] A rotary locking telescopic rod structure includes an inner tube (1) and an outer tube (2) nested together.

[0009] The inner tube is fixed at the tail end with a bolt;

[0010] A tapered sleeve and a locking sleeve are installed on the bolt, and at least one of the tapered sleeve and the locking sleeve is threadedly connected to the bolt; if the locking sleeve is threadedly connected, the tapered sleeve slides; or the two are threaded in opposite directions; preferably, the locking sleeve is threadedly connected to the bolt, and the tapered sleeve slides freely axially.

[0011] The outer surface of the conical sleeve is a conical surface. The locking sleeve expands radially under the pressure of the conical surface of the conical sleeve and rebounds when it is released.

[0012] Specifically, during the locking operation, the inner tube and outer tube are rotated relative to each other, and the threaded drive tapered sleeve approaches the locking sleeve axially. The tapered surface of the tapered sleeve squeezes the locking sleeve, causing it to expand radially and fit tightly against the inner wall of the outer tube. During the unlocking operation, the inner tube is rotated in the opposite direction, and the tapered sleeve and locking sleeve separate axially. The locking sleeve springs back and contracts, and the pull rod can extend and retract freely.

[0013] Preferably, the bolt is fixed with a limit nut to limit the maximum axial separation distance between the tapered sleeve and the locking sleeve.

[0014] Preferably, the locking sleeve has a groove, and the inner wall of the outer tube or the next-level inner tube has a protrusion. The groove engages with the protrusion to prevent relative rotation. In multi-level nesting, the rotational action is transmitted to the outer tube or the next-level inner tube, realizing a multi-level linkage transmission mechanism, achieving three or more levels of locking and extension. Specifically, in multi-level locking, after rotating the inner tube to drive the locking sleeve to lock the current section of the pull rod, the rotational action is transmitted to the outer tube or the next-level inner tube through the engagement of the groove and the protrusion, driving the next-level pull rod to lock. In unlocking, after rotating the inner tube in the opposite direction to drive the locking sleeve to loosen the current section of the pull rod, when the locking sleeve reaches the maximum separation distance limited by the limit nut, the inner tube continues to rotate, and the rotational action is transmitted to the next-level pull rod through the engagement of the groove and the protrusion, realizing step-by-step unlocking.

[0015] Preferably, the locking sleeve and the conical surface mating part have a uniformly symmetrical forked structure. The forked structure expands when compressed and automatically springs back when disengaged. This achieves no shaking when locking; automatic and uniform springback when disengaged; and no jamming during extension or retraction.

[0016] Preferably, the locking sleeve adopts a high-friction material embedded with a metal hexagonal nut structure, wherein the high-friction material includes rubber or polyurethane. This ensures uniform deformation of the bifurcated elastic structure under compression, ensuring the stability of the radial expansion of the locking sleeve. This structure drives rebound through elastic potential energy, ensuring smooth extension and retraction of the pull rod. The stress distribution of the bifurcated structure is optimized through finite element analysis, improving its fatigue resistance.

[0017] Preferably, the outer diameter of the conical sleeve at the bottom of the inner tube is larger than the outer diameter of the inner tube, and a limiting dust sleeve is fixed at the top of the outer tube, the inner diameter of which is smaller than the maximum outer diameter of the conical sleeve. The conical sleeve and the limiting dust sleeve cooperate to limit the maximum distance of the inner tube's extension, preventing the inner tube from detaching from the outer tube. Depending on the actual application scenario, other components can be provided at the bottom of the inner tube as an inner tube stop device; preferably, the conical sleeve is used as this component in this invention.

[0018] Preferably, when the pull rod is extended to its longest position, the conical sleeve contacts the limiting dust sleeve, driving the locking sleeve to expand radially and achieve automatic locking. Specifically, the conical sleeve acts as a stop device, enabling operation-free locking. When the pull rod is in its longest position, the conical sleeve at the end of the inner tube contacts the limiting dust sleeve, and the conical sleeve moves towards the locking sleeve under axial compression. Its conical surface forces the bifurcated structure of the locking sleeve to expand radially, tightly fitting against the inner wall of the outer tube, achieving automatic locking. At this time, no user rotation is required, and the pull rod is in a stable locked state without shaking. When the user slightly shakes the pull rod, the rebound force of the elastic bifurcated structure causes the locking sleeve to contract and reset, releasing the locking state, and the pull rod can extend and retract freely.

[0019] Preferably, the cone surface (401) angle of the cone sleeve (4) is 10° to 45°, preferably 15°. The small taper increases the working area and makes the locking more secure. Considering the convenience of use, the first-level pull rod can be unlocked or locked within one rotation. The pitch is designed to be 1-2mm to ensure sufficient locking force and loosening gap within one rotation. This design increases the locking contact area so that the inner and outer tubes remain under uniform force when stretched to their longest state, thus avoiding shaking.

[0020] Preferably, the top of the inner tube (1) is fixed with a handle (8) to facilitate single-handed rotation and extension / retraction. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 is a schematic diagram of the three-section tube structure of this utility model;

[0023] Figure 2 is a cross-sectional view of a single section of this utility model;

[0024] Figure 3 is a partial cross-sectional view of the utility model, showing a schematic diagram of the cooperation between the outer tube protrusion (201) and the locking sleeve groove (502);

[0025] Figure 4 is a top view of the locking sleeve of this utility model, showing the distribution of the bifurcated structure 501 and the groove 502;

[0026] The following are the reference numerals in the figure: Inner tube 1, outer tube or lower inner tube 2, bolt 3, tapered sleeve 4, locking sleeve 5, limit nut 6, limit dust cover 7, handle 8, outer tube protrusion (201), groove (502); Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 based on the specific circumstances.

[0029] Example 1: Three tubes, two-stage structure, for use in a rolling suitcase.

[0030] Material selection and processing

[0031] Pipes: The inner tube (1) and the outer tube (2) are made of lightweight and strong aluminum profiles and produced by extrusion process.

[0032] Tapered sleeve (4) and locking sleeve (5): produced using molds to ensure accurate dimensions and high surface finish.

[0033] Bolts (3): High-strength alloy steel is selected, and its hardness and fatigue resistance are improved through heat treatment.

[0034] Assembly steps detailed

[0035] Bolt (3) is fixed to the tail of inner tube (1) by adhesive bonding or welding to ensure that it is secure and does not loosen.

[0036] Install the cone sleeve (4), locking sleeve (5) and limit nut (6) in sequence to ensure that the gaps between the components are appropriate and that the rotation is smooth.

[0037] Insert the inner tube (1) into the outer tube (2).

[0038] The top of the outer tube (2) is fixed with a dust cover (7) by adhesive bonding to ensure that it will not fall off.

[0039] An anti-collision pad (8) is glued to the lower end of the inner tube (1) to provide a buffer and protect the pull rod from impact damage.

[0040] Assemble the next level in sequence until the entire tie rod is assembled.

[0041] The top inner tube has a handle for easy user operation; the bottom of the bottom outer tube connects to the luggage's fixing components to ensure a secure connection between the pull rod and the luggage.

[0042] Operating procedures and testing

[0043] Single-handed locking operation: Rotate the inner tube (1) clockwise, the conical sleeve (4) moves towards the locking sleeve (5), and the conical surface (401) squeezes the locking sleeve (5) radially to expand and lock the outer tube (2). Test the locking force and stability.

[0044] One-handed unlocking operation: Rotate the inner tube (1) counterclockwise, the cone sleeve (4) separates from the locking sleeve (5), the locking sleeve retracts, and the lever can extend and retract freely. Test the smoothness and flexibility of unlocking.

[0045] Multi-level linkage ensures that each lever can be unlocked and locked sequentially.

[0046] Technical parameters and optimization

[0047] The cone (401) angle is optimized to 15°, and with the same locking sleeve length, it can provide more force application area, ensuring a firm lock and smooth unlocking.

[0048] The thread pitch is selected as 2mm to balance the locking strength and unlocking force.

[0049] The locking sleeve (5) adopts a rubber inner sleeve hexagonal nut structure to improve friction and fatigue resistance.

[0050] Conduct life tests to ensure that the lever can withstand at least 100,000 locking and unlocking operations without significant wear.

[0051] Example 2: A device including the rotary locking telescopic rod

[0052] This embodiment provides a device including the above-mentioned rotary locking telescopic rod, such as a suitcase, campervan, or transport vehicle that requires telescopic adjustment. The user can extend and lock the rod by rotating the handle (8), which is convenient to operate and has a stable and reliable structure. Beneficial effects

[0053] One-handed stepless adjustment: Users can flexibly adjust the locking length to any desired length, improving ease of use.

[0054] Simplified structure: The core components only require a tapered sleeve, a locking sleeve, and bolts, making production and assembly simple and reducing costs.

[0055] High reliability: The conical locking surface distributes force evenly, ensuring reliable locking without any shaking, even at its longest setting.

[0056] This patented embodiment can achieve automatic locking without rotation and without shaking. When the user slightly shakes the lever, the elastic forked structure releases the locking state through the rebound force.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. For example, the limiting nut can be other limiting structures, such as a welding block. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

[0058] The term "threaded connection" includes forward, reverse, or pitch threads, and is not limited to a specific direction of rotation.

[0059] "Elastic deformation structure" encompasses solutions such as bifurcations, corrugations, and spring sheets that can achieve radial deformation.

[0060] "High-friction material layer" includes, but is not limited to, rubber, silicone, polyurethane or composite materials.

Claims

1. A rotary locking telescopic pull rod comprising an inner tube (1) and an outer tube (2) arranged in a nested manner, characterized in that: a bolt (3) is fixed at the tail of the inner tube (1); a taper sleeve (4) and a locking sleeve (5) are mounted on the bolt (3), at least one of the taper sleeve (4) and the locking sleeve (5) is threadedly connected with the bolt (3); the outer surface of the taper sleeve (4) is a taper surface (401), and the locking sleeve (5) is radially expanded under the extrusion of the taper surface (401) of the taper sleeve (4) and rebounds when disengaged.

2. The rotary locking telescopic pull rod according to claim 1, characterized in that: the bolt (3) is fixed with a limiting nut (6) for limiting the maximum axial separation distance of the taper sleeve (4) and the locking sleeve (5).

3. The rotary locking telescopic pull rod according to claim 1 or 2, characterized in that: the locking sleeve (5) is provided with a groove (502), the inner wall of the outer tube (2) is provided with a protrusion (201), the groove (502) and the protrusion (201) are engaged to prevent relative rotation and conduct the rotary action to the outer tube (2) or the next level inner tube.

4. The rotary locking telescopic pull rod according to claim 1, characterized in that: the matching part of the locking sleeve (5) and the taper surface (401) is a uniform and symmetrical bifurcated structure (501), the bifurcated structure (501) expands when extruded and rebounds automatically when disengaged.

5. The rotary locking telescopic pull rod according to claim 1, characterized in that: the locking sleeve (5) adopts a high-friction material embedded metal hexagonal nut structure, and the high-friction material includes rubber or polyurethane.

6. The rotary locking telescopic pull rod according to claim 1, characterized in that: the outer diameter of the taper sleeve (4) at the bottom of the inner tube (1) is greater than the outer diameter of the inner tube (1), the top of the outer tube (2) is fixed with a limiting dust cover (7), and the inner diameter of the limiting dust cover (7) is smaller than the maximum outer diameter of the taper sleeve (4).

7. The rotary locking telescopic pull rod according to claim 1, characterized in that: the angle of the taper surface (401) of the taper sleeve (4) is 10° to 45°.

8. The rotary locking telescopic pull rod according to claim 1, characterized in that: when the pull rod is stretched to the longest state, the taper sleeve (4) is in contact with the limiting dust cover (7), driving the locking sleeve (5) to radially expand to achieve automatic locking.

9. The rotary locking telescopic pull rod according to claim 1, characterized in that: a handle (8) is fixed at the top of the inner tube (1).

10. A rotary locking telescopic pull rod and a device comprising the same, characterized in that: the rotary locking telescopic pull rod according to any one of claims 1-9 is included.

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