Locking device for telescopic pipe

Abstract

The utility model provides a locking device for a telescopic pipe, which comprises an inner pipe, an outer pipe and a locking mechanism for locking the inner pipe and the outer pipe, the locking mechanism comprises a sliding mechanism and a driving mechanism, one of the sliding mechanism and the driving mechanism is positioned in the inner pipe, and the other one is positioned in the outer pipe; the guide groove is located in the driving mechanism or the sliding mechanism, the protruding block is matched with the guide groove, and the protruding block is arranged at the position of the sliding mechanism or the position of the driving mechanism or between the sliding mechanism and the driving mechanism. During relative rotation of the inner pipe and the outer pipe, the sliding mechanism is promoted to move relative to the driving mechanism, the protruding block is matched with the guide groove, the expansion mechanism at the driving mechanism or the sliding mechanism expands outwards and abuts against the inner surface of the outer pipe in an interference mode, and locking is completed. The protruding block and the guide groove can form guiding, so that the expansion mechanism expands outwards and abuts against the inner surface of the outer pipe to interfere with the inner surface of the outer pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of locking auxiliary mechanisms used in telescopic tubes, in particular to a locking device for telescopic tubes. Background Art

[0002] When locking the telescopic tube, you can choose to lock it through a locking mechanism during rotation, but the locking structure is generally solid, and then the relevant locking is performed through a complex structure. However, the connection between the drive and movable parts in the locking structure is difficult to ensure stability. Utility Model Content

[0003] The purpose of the utility model is to provide a locking device for a telescopic tube, which completes locking by utilizing the linkage of a driving mechanism and a sliding mechanism. In order to increase the locking effect, a guide groove and a protrusion are provided so that the protrusion contacts the inner wall of the outer tube to achieve firm locking.

[0004] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions.

[0005] A locking device for a telescopic tube, comprising an inner tube and an outer tube, and a locking mechanism for locking the inner tube and the outer tube, wherein the locking mechanism comprises a sliding mechanism and a driving mechanism, wherein one of the sliding mechanism and the driving mechanism is located in the inner tube and the other is located in the outer tube;

[0006] It also includes a guide groove on the driving mechanism or the sliding mechanism, and a protrusion matching the guide groove, wherein the protrusion is provided at the sliding mechanism, or at the driving mechanism, or between the sliding mechanism and the driving mechanism;

[0007] When the inner tube and the outer tube rotate relative to each other, the sliding mechanism is prompted to move relative to the driving mechanism, and the protrusion and the guide groove cooperate to cause the expansion mechanism at the driving mechanism or the sliding mechanism to expand outward and interfere with the inner surface of the outer tube, thereby completing the locking;

[0008] Or the inner tube and the outer tube rotate relative to each other, and the expansion mechanism sinks inwards away from the inner surface of the outer tube, thereby completing the unlocking.

[0009] Furthermore, the sliding mechanism and the driving mechanism rotate relative to each other when sliding, and the guide groove is a spiral groove formed along the rotation trajectory.

[0010] Furthermore, the guide groove is an arc groove arranged along the circumference of the driving mechanism, and the length of the guide groove is smaller than the circumference of the driving mechanism.

[0011] Furthermore, there are a plurality of circular arc grooves, and the extended lines of the circular arc grooves at a plurality of different heights are connected to form the spiral groove.

[0012] Furthermore, the guide groove is arranged along the circumference of the driving mechanism and forms an inclined groove inclined with respect to the driving mechanism.

[0013] Furthermore, the sliding mechanism forms an assembly rack, the assembly rack forms an assembly frame for the expansion mechanism to expand outward, and the expansion mechanism is movably arranged on the assembly frame.

[0014] Furthermore, the assembly frame and the guide groove are staggered, and the cross-sectional area formed by the guide groove is smaller than the cross-sectional area formed by the assembly frame.

[0015] Furthermore, a guiding portion is provided at the protrusion, and the guiding portion is used to guide the protrusion into the guide groove.

[0016] Furthermore, the guide groove is located inside the outer tube, so that the outer tube forms a limiting structure for the protrusion when it moves along the guide groove.

[0017] Furthermore, the driving mechanism also includes a fixing seat plugged into the inner tube or outer tube, and the sliding mechanism is provided with a guide groove or a convex strip along the length direction of the inner tube or outer tube, so that the sliding mechanism moves along the length direction of the inner tube or outer tube.

[0018] The beneficial effects of the utility model are as follows:

[0019] In the utility model, a simple structure and easy operation are achieved by utilizing the simple sliding of the sliding mechanism and the driving mechanism. Then, the protrusion and the guide groove are combined to form a good guiding effect during movement. Then, the two are combined, and the protrusion extends out of the guide groove, prompting the sliding mechanism to move spirally relative to the driving mechanism, so that the expansion mechanism expands outward and interferes tightly with the inner surface of the outer tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of a locking device for a telescopic tube provided by the present invention;

[0021] Figure 2 This is a front view of the locking device for the telescopic tube provided by the utility model;

[0022] Figure 3 This is a cross-sectional view of the locking device for the telescopic tube provided by the present invention;

[0023] Figure 4 This is the second cross-sectional view of the locking device for the telescopic tube provided by the present invention;

[0024] Figure 5 This is a diagram showing the locking device for the telescopic tube in the present invention in use;

[0025] In the picture:

[0026] 1. Inner tube; 2. Outer tube; 3. Sliding mechanism; 31. Assembly frame; 4. Driving mechanism; 41. Fixed seat; 42. Eccentric mechanism; 5. Guide groove; 6. Bump; 7. Expansion mechanism; 8. Auxiliary elastic member; 9. Screw rod; 10. Screw hole. DETAILED DESCRIPTION

[0027] The present invention is described in detail below with reference to the various embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in this field based on these embodiments are all within the scope of protection of the present invention.

[0028] Refer to the attached Figure 1-5 As shown, the locking device for the telescopic tube in this embodiment includes an inner tube 1 and an outer tube 2, and a locking mechanism for locking the inner tube 1 and the outer tube 2, the locking mechanism includes a sliding mechanism 3 and a driving mechanism 4, one of the sliding mechanism 3 and the driving mechanism 4 is located in the inner tube 1, and the other is located in the outer tube 2; the inner tube and the outer tube are locked relative to each other by utilizing the action of the driving mechanism and the sliding mechanism, but since there may be a gap problem when the sliding mechanism is locked and close to the outer tube or the inner tube to complete the locking, an expansion mechanism is provided, and when the sliding mechanism slides, the expansion mechanism 7 expands outward or locks inward to complete the locking and unlocking. At this time, the interaction between the guide groove 5 and the protrusion 6 is utilized to form an external force on the expansion mechanism, thereby assisting it to achieve a tighter interference locking state with the outer tube or the inner tube.

[0029] In this embodiment, the guide groove 5 can be set on the driving mechanism 4 or the sliding mechanism 3, and then when locking, the protrusion 6 partially passes through the guide groove 5, forming an interference guiding trend; and for the protrusion 6, it and the guide groove 5 only cooperate with each other and are not on the same mechanism. For example, when the guide groove 5 is set on the driving mechanism, the protrusion 6 can be set on the sliding mechanism, or located between the driving mechanism and the sliding mechanism, and when the guide groove is on the sliding mechanism, the guide groove 5 can be set on the driving mechanism, or between the sliding mechanism and the driving mechanism.

[0030] In this embodiment, the protrusion is preferably a guide column, and the guide column can move in the guide groove and form a guiding trend along the direction of the guide groove.

[0031] The working principle in this embodiment is:

[0032] During the relative rotation of the inner tube 1 and the outer tube 2, the sliding mechanism 3 is caused to move relative to the driving mechanism 4. The protrusion 6 cooperates with the guide groove 7, causing the expansion mechanism 7 at the driving mechanism 4 or the sliding mechanism 3 to expand outwards and interfere with the inner surface of the outer tube 2, thus completing the locking.

[0033] Or the inner tube 1 and the outer tube 2 rotate relative to each other, and the rotation direction at this time is opposite to the locking direction, and then the expansion mechanism 7 sinks inward away from the inner surface of the outer tube 2, and the inner tube 1 and the outer tube 2 move away, completing the unlocking.

[0034] In this embodiment, the guide grooves and the protrusions are described as follows:

[0035] First, in this embodiment, the guide groove is a spiral groove formed along the rotation trajectory of the spiral in order to provide better guidance, so that the movement of the protrusion formed by the guide column is similar to the spiral rotation trajectory of the inner and outer tubes;

[0036] Secondly, for the specific structure, the guide groove is specifically an arc groove provided along the circumference of the drive mechanism 3, and the length of the guide groove is less than the circumference of the drive mechanism 3. That is, the guide track of the guide groove is less than one circle. If the guide intervention is too much, not only will it occupy a large space, but also the drive mechanism and the sliding mechanism have already been screwed to a certain position in the early stage with the expansion mechanism. At this point, it only plays an auxiliary role and does not need to be set too much.

[0037] Finally, to form auxiliary guides at multiple locations, in this embodiment, multiple arc grooves are provided in the vertical direction. The extended lines of the arc grooves at different heights are connected to form the spiral groove. In other words, there are multiple guide grooves 5, and when connected in the vertical direction, several guide grooves 5 can form a spiral groove. Several guide grooves are also provided in the horizontal direction. In this case, the guide grooves are arranged along the circumference of the drive mechanism 4 and form inclined grooves that are inclined with respect to the drive mechanism 4. These inclined grooves achieve the tendency to tilt upward or downward along the drive mechanism 4, providing a basic motion trajectory for interference.

[0038] Refer to the attached Figure 4-5 As shown, the specific driving mechanism and sliding mechanism are described in detail as follows:

[0039] Refer to the attached Figure 4 As shown, the sliding mechanism 3 forms an assembly frame 31, which forms an assembly frame for the expansion mechanism 7 to expand outward. The expansion mechanism 7 is movably installed in the assembly frame. In this case, the expansion mechanism 7 can be a plurality of independent arc-shaped pieces, or a structure in which a plurality of arc-shaped pieces are connected to form an integral structure via a connecting ring.

[0040] To better utilize space, the assembly frame and the guide groove 5 are staggered, and the cross-sectional area formed by the guide groove 5 is smaller than the cross-sectional area formed by the assembly frame. In this embodiment, the assembly frame is mainly used to assemble the expansion mechanism 7, which is the core of the locking and has a relatively large cross-sectional area. The assembly frame is hollowed out on the assembly frame, while the guide groove 5 is set on the assembly frame. Therefore, the two are staggered, but at the same time they assist the spiral, thus achieving multiple goals at one stroke.

[0041] In this embodiment, the projection 6 is provided with a guide portion 61 for guiding the projection 6 into the guide groove 7. In this embodiment, the guide portion 61 may be a tapered end portion of a guide column, making it easier to enter the guide groove 7.

[0042] In this embodiment, the guide groove 5 is located within the outer tube 1, forming a position-limiting structure for the outer tube 1 as the projection 6 moves along the guide groove 7. Regardless of the rotation, the projection 6 will not rotate out, thereby providing a relative position limit to prevent outflow. Throughout the entire movement, the projection 6 moves back and forth along the guide groove 7 as it unlocks and locks.

[0043] In this embodiment, for assembly purposes, the drive mechanism 4 further includes a fixing seat 41 that plugs into the inner tube 1 or outer tube 2. The sliding mechanism 3 is provided with guide grooves or ridges along the length of the inner tube or outer tube, enabling the sliding mechanism to move along the length of the inner tube or outer tube. That is, during rotation, the drive mechanism 4 is fixed within the inner tube or outer tube. The guide grooves or ridges on the sliding mechanism 3 then allow corresponding ridges or grooves to be provided within the inner tube or outer tube. The two cooperate to form a sliding path, allowing the sliding mechanism 3 to slide along the length of the inner tube or outer tube.

[0044] In this embodiment, the inner tube 1 and the outer tube 2 are locked, which can also be achieved by the following scheme:

[0045] A spiral hole 10 is provided in the driving mechanism, and then a spiral rod 9 is provided on the sliding mechanism. When the inner tube and the outer tube rotate, the spiral rod 9 and the spiral hole 10 rotate accordingly, so that the sliding mechanism and the driving mechanism change their positions simultaneously in the longitudinal direction and the circumferential direction. During the transformation, the eccentric mechanism 42 is utilized to make one end of the rotation eccentric, thereby causing the expansion 7 to expand outwards, thereby achieving locking interference.

[0046] Specifically, for the eccentric mechanism 42, it is specifically a number of gradual protrusions. For example, the driving mechanism adopts a cylindrical structure, and then its outer surface is provided with gradual protrusions with gradually increasing thickness along the circumferential direction. Then, during rotation, the driving mechanism 4 cannot rotate according to the previous circular motion, but moves outward under the interference of the gradual protrusions, and then contacts the outer tube 2. At the same time, the expansion mechanism 7 is also guided to move outward and expand, thereby completing the locking.

[0047] In this embodiment, the driving mechanism has a tubular cavity, which is connected to the spiral hole. When the spiral rod 9 passes through the spiral hole, the end of the spiral rod 9 extends into the tubular cavity. The end of the spiral rod 9 is fixed to a limit plate by a screw. An auxiliary elastic member 8 is provided between the limit plate and the driving mechanism. The auxiliary elastic member 8 is sleeved on the spiral rod, which helps the spiral rod to be stably retracted in the tubular cavity of the driving mechanism, so that the sliding mechanism has a tendency to screw into the driving mechanism under the action of the auxiliary elastic member 8, so that the inner tube 1 and the outer tube 2 have a tendency to lock without being controlled by external force, that is, the expansion mechanism has a tendency to expand outward and interfere tightly with the inner surface of the outer tube 1.

[0048] When using the utility model, the driving mechanism can be set on the inner tube, and then the sliding frame is located inside the outer tube. Under the action of external force, the inner tube approaches the outer tube and rotates the inner tube, and then the driving mechanism and the sliding frame interact with each other. At this time, the sliding mechanism can only slide up and down, while the driving mechanism can rotate under the action of the guide groove, so that relative rotation is formed between the sliding mechanism and the driving mechanism to complete locking or unlocking.

[0049] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

[0050] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0051] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A locking device for a telescopic tube, comprising an inner tube and an outer tube, and a locking mechanism for locking the inner tube and the outer tube, characterized in that: The locking mechanism includes a sliding mechanism and a driving mechanism, wherein one of the sliding mechanism and the driving mechanism is located in the inner tube and the other is located in the outer tube; It also includes a guide groove on the driving mechanism or the sliding mechanism, and a protrusion matching the guide groove, wherein the protrusion is provided at the sliding mechanism, or at the driving mechanism, or between the sliding mechanism and the driving mechanism; When the inner tube and the outer tube rotate relative to each other, the sliding mechanism is prompted to move relative to the driving mechanism, and the protrusion and the guide groove cooperate to cause the expansion mechanism at the driving mechanism or the sliding mechanism to expand outward and interfere with the inner surface of the outer tube, thereby completing the locking; Or the inner tube and the outer tube rotate relative to each other, and the expansion mechanism sinks inwards away from the inner surface of the outer tube, thereby completing the unlocking.

2. The locking device for a telescopic tube according to claim 1, characterized in that: The sliding mechanism and the driving mechanism rotate relative to each other, and the guide groove is a spiral groove formed along the rotation track.

3. The locking device for a telescopic tube according to claim 2, characterized in that: The guide groove is an arc groove arranged along the circumference of the driving mechanism, and the length of the guide groove is smaller than the circumference of the driving mechanism.

4. The locking device for a telescopic tube according to claim 3, characterized in that: There are a plurality of circular arc grooves, and the spiral groove is formed by connecting the extension lines of the circular arc grooves at a plurality of different heights.

5. The locking device for a telescopic tube according to claim 3, characterized in that: The guide groove is arranged along the circumference of the driving mechanism and forms an inclined groove inclined with respect to the driving mechanism.

6. The locking device for a telescopic tube according to claim 1, characterized in that: The sliding mechanism forms an assembly rack, and the assembly rack forms an assembly frame for the expansion mechanism to expand outwards, and the expansion mechanism is movably arranged on the assembly frame.

7. The locking device for a telescopic tube according to claim 6, characterized in that: The assembly frame and the guide groove are staggered, and the cross-sectional area formed by the guide groove is smaller than the cross-sectional area formed by the assembly frame.

8. The locking device for a telescopic tube according to claim 1, characterized in that: A guiding portion is provided at the protrusion, and the guiding portion is used to guide the protrusion into the guide groove.

9. The locking device for a telescopic tube according to claim 1, characterized in that: The guide groove is located in the outer tube, so that the outer tube forms a limiting structure for the projection when it moves along the guide groove.

10. The locking device for a telescopic tube according to claim 1, characterized in that: The driving mechanism also includes a fixing seat plugged into the inner tube or outer tube, and the sliding mechanism is provided with a guide groove or a convex strip along the length direction of the inner tube or outer tube, so that the sliding mechanism moves along the length direction of the inner tube or outer tube.

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