Locking device for telescopic rod and telescopic device

Abstract

The utility model relates to a telescopic device, in particular to a locking device for a telescopic rod and the telescopic device. A locking device for a telescopic rod comprises a tensioning seat provided with a connecting column and a tensioning column which are used for being fixed to an inner rod; the tensioning sleeve is provided with a tensioning groove, a tensioning arc section and a loosening arc section, the tensioning arc section and the loosening arc section are arranged on the two sides of the tensioning groove and connected in sequence, the thickness of the tensioning arc section is larger than that of the loosening arc section, the tensioning column is movably sleeved with the tensioning sleeve, and the tensioning sleeve is used for being movably inserted into the outer rod; when the inner rod is rotated and the tensioning column is rotated to the tensioning arc section, the outer circular surface of the tensioning sleeve is pressed on the inner circular surface of the outer rod, and when the tensioning column is rotated to the loosening arc section, the outer circular surface of the tensioning sleeve and the inner circular surface of the outer rod are in a clearance fit state. According to the locking device, the inner rod and the outer rod are fixed in a tensioning mode through the tensioning sleeve and the tensioning seat, tensioning and loosening can be achieved by rotating the inner rod and the outer rod by 90 degrees, rotation for multiple circles is not needed, and the locking device is quite labor-saving and quite convenient to use.

Description

Technical Field

[0001] This utility model relates to a telescopic device, and more particularly to a locking device and a telescopic device for a telescopic rod. Background Technology

[0002] Existing telescopic rods mostly achieve relative fixation between two rods through clamping. For example, a rotary mop disclosed in Chinese patent CN201752392U has an inner rod that, after being inserted into the connector, can be locked by pressing a movable sleeve, which is screwed inwards, against a locking groove, thus connecting and fixing the inner rod to the connector. A locking structure is provided between the inner and outer rods to lock their telescopic movement. This locking structure includes a fixed sleeve fixed to the lower end of the outer rod, with multiple evenly distributed locking grooves and a movable sleeve threaded onto the fixed sleeve at the lower end of the fixed sleeve. After the inner rod is inserted into the outer rod, the inner rod can be locked by pressing the locking grooves against the movable sleeve, thus connecting and fixing the inner and outer rods.

[0003] When locking, the movable sleeve usually needs to be rotated multiple times and a large force is required to lock the inner rod. Otherwise, the inner rod is easy to slide, and it is very difficult to loosen. Overall, it is inconvenient to use. Utility Model Content

[0004] To address the aforementioned inconvenience in use, this utility model provides a locking device for telescopic poles, the specific technical solution of which is as follows:

[0005] A locking device for a telescopic rod includes: a tensioning seat with a connecting post and a tensioning post for fixing to an inner rod; and a tensioning sleeve with a tensioning groove and a tensioning arc segment and a release arc segment connected sequentially on both sides of the tensioning groove, wherein the thickness of the tensioning arc segment is greater than the thickness of the release arc segment, the tensioning sleeve is movably sleeved on the tensioning post, and the tensioning sleeve is movably inserted into an outer rod; when the inner rod is rotated, when the tensioning post rotates to the tensioning arc segment, the outer circular surface of the tensioning sleeve presses against the inner circular surface of the outer rod, and when the tensioning post rotates to the release arc segment, the outer circular surface of the tensioning sleeve and the inner circular surface of the outer rod are in a clearance fit state.

[0006] Preferably, the top of the tensioning column is further provided with a limiting plate, which is movably located at the top of the tensioning sleeve.

[0007] Preferably, the tensioning column is further provided with a reinforcing column.

[0008] Preferably, the tensioning seat is further provided with a limiting ring, which is located between the connecting column and the tensioning column.

[0009] Preferably, the top of the connecting column is provided with a guide cone surface.

[0010] Preferably, the tensioning sleeve is further provided with a tensioning positioning block and a loosening positioning block inside, the tensioning positioning block being located at one end of the tensioning arc segment, and the loosening positioning block being located at one end of the loosening arc segment.

[0011] Preferably, the outer circular surface of the tensioning sleeve is provided with a plurality of tensioning blocks for pressing against the inner circular surface of the outer rod.

[0012] Preferably, the outer circular surface of the tensioning sleeve is provided with a positioning groove to prevent rotation inside the outer rod.

[0013] A telescopic device includes a locking device for a telescopic rod; an inner rod, wherein the tensioning post of the tensioning seat is disposed on the top of the inner rod; and an outer rod, which is movably inserted into the inner rod and the tensioning sleeve.

[0014] Preferably, the bottom of the outer rod is provided with a limiting protrusion.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention provides a locking device for a telescopic rod, which uses a tensioning sleeve and a tensioning seat to fix the inner rod and the outer rod by tensioning. It can be tightened and loosened by rotating 90°, without the need for multiple rotations, and is very labor-saving and convenient to use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the locking device used for telescopic rods;

[0018] Figure 2 This is a schematic diagram of the tensioner seat structure;

[0019] Figure 3 This is a schematic diagram of the tensioning sleeve structure;

[0020] Figure 4 This is a front view of the tensioning sleeve;

[0021] Figure 5 This is a cross-sectional view of the locking device for the telescopic rod in the released state;

[0022] Figure 6 This is a cross-sectional view of the locking device used for the telescopic rod in the tensioned state;

[0023] Figure 7 This is a structural diagram of the telescopic device;

[0024] Figure 8 It is a cross-sectional view of the telescopic device along its axis;

[0025] Figure 9 yes Figure 8 A magnified view of a section at point I;

[0026] Figure 10 yes Figure 8 Enlarged view of section II in the middle;

[0027] Figure 11 It is a cross-sectional view along the tensioning seat and tensioning sleeve in the telescopic device. Detailed Implementation

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

[0029] like Figures 1 to 6As shown, a locking device for a telescopic rod includes a tensioning seat 1 and a tensioning sleeve 2. The tensioning seat 1 includes a tensioning column 11 and a connecting column 13 arranged sequentially from top to bottom. The connecting column 13 is used to fix the inner rod 4 to the top. The tensioning column 11 is flat. The tensioning sleeve 2 is movably inserted into the tensioning column 11. The tensioning sleeve 2 is provided with a tensioning groove 21, a tensioning arc segment 27, and a loosening arc segment 26. The tensioning groove 21 is arranged along the axis of the tensioning sleeve 2, forming an open groove structure, so that the tensioning sleeve 2 can be opened from the inside. The inner arc surfaces of the tensioning arc segment 27 and the loosening arc segment 26 are connected by an arc transition. The thickness of the tensioning arc segment 27 is greater than the thickness of the loosening arc segment 26. There are two tensioning arc segments 27 and two loosening arc segments 26, which are located on both sides of the tensioning groove 21. The two tensioning arc segments 27 and the two loosening arc segments 26 are arranged opposite to each other, and the tensioning arc segments 27 and the loosening arc segments 26 are arranged opposite to the tensioning column 11. The two side end faces of the tensioning column 11 can slide on the inner arc surfaces of the tensioning arc segment 27 and the loosening arc segment 26, thereby pushing the tensioning arc segment 27 to open and the loosening arc segment 26 to retract. The tensioning sleeve 2 is movably inserted into the outer rod 3. When the inner rod 4 is rotated, when the tensioning column 11 rotates to the tensioning arc section 27, the outer circular surface of the tensioning sleeve 2 presses against the inner circular surface of the outer rod 3, so that the inner rod 4 is locked on the outer rod 3. When the tensioning column 11 rotates to the loosening arc section 26, the outer circular surface of the tensioning sleeve 2 and the inner circular surface of the outer rod 3 are in a clearance fit state, and the inner rod 4 can freely extend and retract inside the outer rod 3. Because the tensioning arc segment 27 is relatively thick, when the tensioning column 11 rotates to the tensioning arc segment 27, the outer circular surface of the tensioning arc segment 27 presses against the inner circular surface of the inner rod 4, achieving relative fixation between the inner rod 4 and the outer rod 3. Because the loosening arc segment 26 is relatively thin, when the tensioning column 11 rotates to the loosening arc segment 26, the loosening arc segment 26 contracts inward towards the tensioning sleeve 2, and the outer circular surface of the loosening arc segment 26 separates from the inner circular surface of the outer rod 3, forming a gap, allowing the inner rod 4 to extend and retract freely. In the free state, the loosening arc segment 26 is in a retracted state so that the outer circular surface of the loosening arc segment 26 can be smaller than the inner diameter of the outer rod 3. The tensioning sleeve 2 is elliptical in both the free and loose states, which reduces contact with the inner surface of the outer rod 3. When the tensioning sleeve 2 is in the tensioned state, the tensioning arc segment 27 is spread open by the tensioning column 11, so that the outer diameter of the tensioning arc segment 27 is larger than the inner diameter of the outer rod 3, allowing the outer surface of the tensioning arc segment 27 to abut against the inner surface of the outer rod 3 and press against it. The inner rod 4 is fixed inside the outer rod 3 by friction.

[0030] When loosening or tightening, the inner rod 4 can be rotated 90 degrees without needing to rotate multiple times. Furthermore, since the tightening force is achieved by the outward expansion of the tightening column 11 and the tightening sleeve 2, rather than by clamping the movable sleeve, it is more labor-saving and easier to use.

[0031] Since the movable sleeve applies pressure to the entire end of the fixed sleeve, the force required to rotate the movable sleeve is relatively large, and it is also more difficult to loosen it. However, the tensioning column 11 and the tensioning sleeve 2 achieve clamping only through two symmetrical tensioning arc segments 27. Therefore, the required rotational force is less than the force required to rotate the movable sleeve, making it easier to tighten.

[0032] To restrict the tensioning sleeve 2 from rotating on the tensioning column 11, a limiting plate 16 is provided at the top of the tensioning column 11. The limiting plate 16 is movably located at the top of the tensioning sleeve 2 and is a circular plate to prevent the tensioning sleeve 2 from detaching from the top of the tensioning column 11. When the tensioning sleeve 2 is installed on the tensioning column 11, it is inserted into the tensioning column 11 through the tensioning groove 21.

[0033] To improve the strength of the tensioning column 11, a reinforcing column 12 is also provided on the tensioning column 11, and the reinforcing column 12 is arranged on the axis of the tensioning seat 1.

[0034] The tensioning seat 1 is also equipped with a limiting ring 15, which is located between the connecting post 13 and the tensioning post 11. The limiting ring 15 has a large diameter and can be locked onto the top of the inner rod 4 for positioning. The tensioning seat 1 and the outer rod 3 can be fixed together with glue. The top of the connecting post 13 is provided with a guide cone surface 14, which facilitates insertion into the top of the inner rod 4.

[0035] like Figure 3 and Figure 4 As shown, to accurately control the position of the tensioning column 11 and facilitate use, the tensioning sleeve 2 is also equipped with a tensioning positioning block 22 and a loosening positioning block 23 inside. The tensioning positioning block 22 is located at one end of the tensioning arc segment 27, and the loosening positioning block 23 is located at one end of the loosening arc segment 26. When the tensioning column 11 is rotated, when the tensioning column 11 reaches the loosening positioning block 23, it indicates that it is in the extreme position of the loosened state, and it restricts the rotation of the tensioning column 11 and the inner rod 4, allowing the operator to perceive the position; when the tensioning column 11 reaches the tensioning positioning block 22, it indicates that it is in the extreme position of the tensioned state, thus limiting the tensioning column 11 in the tensioned position and preventing the tensioning column 11 from slipping past the tensioning arc segment 27, ensuring reliable tensioning. Both the tensioning positioning block 22 and the loosening positioning block 23 are arranged along the axis of the tensioning sleeve 2.

[0036] like Figure 3 and Figure 4As shown, the outer circular surface of the tensioning sleeve 2 is provided with several tensioning blocks 24 for pressing against the inner circular surface of the outer rod 3. The tensioning blocks 24 are arranged along the axis of the tensioning sleeve 2. Due to the limited width of the tensioning column 11, when the tensioning column 11 pushes the tensioning sleeve 2 to press against the inner circular surface of the outer rod 3, the contact point between the tensioning sleeve 2 and the outer rod 3 is mainly linear, resulting in a small overall contact area. This makes it easy for relative sliding to occur between the outer rod 3 and the inner rod 4. The tensioning blocks 24 can increase the contact area between the tensioning arc segment 27 and the inner circular surface of the outer rod 3, that is, they can form multiple pressing lines, thereby increasing the pressing contact area, improving friction, making the fixation between the inner rod 4 and the outer rod 3 more reliable, less prone to relative sliding, and keeping the locked length of the telescopic rod unchanged.

[0037] To prevent the tension sleeve 2 from rotating with the tensioning column 11 when the tensioning column 11 rotates, the outer circular surface of the tension sleeve 2 is provided with a positioning groove 25. The positioning groove 25 matches the positioning protrusion inside the outer rod 3, which can prevent the tension sleeve 2 from rotating inside the outer rod 3, thus avoiding the tension sleeve 2 from rotating with the tensioning column 11, thereby ensuring the reliability of tensioning and loosening.

[0038] like Figures 7 to 11 As shown, a telescopic device includes a locking device for the telescopic rod, an inner rod 4, and an outer rod 3. The tensioning column 11 of the tensioning seat 1 fixes the top of the inner rod 4; the outer rod 3 is movably inserted into the inner rod 4 and the tensioning sleeve 2. Both the outer rod 3 and the inner rod 4 are circular tubes.

[0039] The telescopic device can be used on cleaning tools such as mops and brooms to adjust their length.

[0040] To prevent the inner rod 4 from falling out of the outer rod 3, a limiting protrusion 31 is provided at the bottom of the outer rod 3. The limiting protrusion 31 protrudes into the outer rod 3 to form an annular protrusion, which is set opposite to the limiting ring 15 of the tensioning seat 1. It can lock the limiting ring 15 so that the inner rod 4 will not detach from the bottom of the outer rod 3.

[0041] The top of the outer rod 3 is usually fitted with a handle, so the inner rod 4 will not detach from the top of the outer rod 3.

[0042] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without inventive effort, and these embodiments will all fall within the protection scope of the claims of this utility model.

Claims

1. A locking device for a telescopic pole, characterized in that, include: The tensioning seat (1) is provided with a connecting post (13) and a tensioning post (11) for fixing to the inner rod (4); and The tensioning sleeve (2) is provided with a tensioning groove (21) and a tensioning arc segment (27) and a release arc segment (26) connected sequentially on both sides of the tensioning groove (21). The thickness of the tensioning arc segment (27) is greater than the thickness of the release arc segment (26). The tensioning sleeve (2) is movably sleeved on the tensioning column (11). The tensioning sleeve (2) is used to be movably inserted into the outer rod (3). When the inner rod (4) is rotated, when the tensioning column (11) rotates to the tensioning arc segment (27), the outer circular surface of the tensioning sleeve (2) is pressed against the inner circular surface of the outer rod (3). When the tensioning column (11) rotates to the release arc segment (26), the outer circular surface of the tensioning sleeve (2) and the inner circular surface of the outer rod (3) are in a clearance fit state.

2. A locking device for a telescopic rod according to claim 1, characterized in that, The top of the tensioning column (11) is also provided with a limiting plate (16), which is movably located at the top of the tensioning sleeve (2).

3. A locking device for a telescopic rod according to claim 1, characterized in that, The tensioning column (11) is also provided with a reinforcing column (12).

4. A locking device for a telescopic rod according to claim 1, characterized in that, The tensioning seat (1) is also provided with a limiting ring (15), which is located between the connecting column (13) and the tensioning column (11).

5. A locking device for a telescopic rod according to claim 1, characterized in that, The top of the connecting column (13) is provided with a guide cone surface (14).

6. A locking device for a telescopic rod according to claim 1, characterized in that, The tensioning sleeve (2) is further provided with a tensioning positioning block (22) and a release positioning block (23) inside. The tensioning positioning block (22) is located at one end of the tensioning arc segment (27), and the release positioning block (23) is located at one end of the release arc segment (26).

7. A locking device for a telescopic rod according to claim 1, characterized in that, The outer surface of the tensioning sleeve (2) is provided with a plurality of tensioning blocks (24) for pressing against the inner surface of the outer rod (3).

8. A locking device for a telescopic rod according to claim 1, characterized in that, The outer surface of the tensioning sleeve (2) is provided with a positioning groove (25) to prevent rotation inside the outer rod (3).

9. A telescopic device, characterized in that, include: A locking device for a telescopic rod as described in claim 1; The inner rod (4), the tensioning pin (11) of the tensioning seat (1) is located at the top of the inner rod (4); and The outer rod (3) is movably inserted into the inner rod (4) and the tensioning sleeve (2).

10. A telescopic device according to claim 9, characterized in that, The bottom of the outer rod (3) is provided with a limiting protrusion (31).

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