Telescopic pipe locking structure

Abstract

The utility model relates to a telescopic pipe locking structure which comprises an outer pipe fitting, an inner pipe fitting and a locking mechanism, the inner pipe fitting is arranged in the outer pipe fitting in a penetrating mode, and the locking mechanism is arranged on the connecting end portion of the outer pipe fitting and the inner pipe fitting. Wherein the locking mechanism comprises a push-pull sleeve and a clamping sleeve, and the clamping sleeve is provided with a nesting section which is embedded and fixed at the end part of the outer pipe fitting and a clamping section which can be locally contracted to clamp the inner pipe fitting; the push-pull sleeve is movably arranged outside the clamping sleeve in a sleeving mode, and the push-pull movement drives the clamping sleeve to lock or unlock the inner pipe fitting. The utility model has the characteristics of unique conception, simple structure and convenience in operation; particularly, the push-pull sleeve is axially matched with the clamping sleeve, and the locking and unlocking operations are realized through the push-pull action of the push-pull sleeve, so that the force is conveniently applied; in addition, the push-pull sleeve and the clamping sleeve are assembled in an interference mode, the push-pull sleeve is not prone to slipping off, the stroke limiting function is achieved, and the telescopic pipe clamp is suitable for being used on various telescopic pipe fittings.

Description

Technical fields:

[0001] This utility model belongs to the field of mechanical locking technology, and specifically relates to a telescopic tube locking structure, particularly a solution that can achieve locking and unlocking by pushing and pulling. Background technology:

[0002] Telescopic structures are widely used in industrial, agricultural, and civilian products. As operable telescopic tubes, they often require a locking mechanism to ensure stable operation. For applications with load-bearing requirements, such as folding tent support poles, elastic pins are mostly used for locking, but this does not allow for stepless adjustment. For applications without load-bearing requirements but still requiring stepless adjustment, such as mops, telescopic mop handles also need a locking mechanism. Currently, the most common types are cam-type locking and threaded locking. For example:

[0003] CN201810013891.2 discloses a locking structure for a telescopic rod, comprising an outer rod body and an inner rod body. The locking structure is located at the connection between the outer and inner rod bodies and includes a fixed connector, a rotating component, and a pressure block. The fixed connector includes an outer rod fixing portion and an inner rod through-sleeve portion. At least one pressure block groove is evenly distributed circumferentially along the sidewall of the inner rod through-sleeve portion, and the pressure block is placed in the pressure block groove. At least one protrusion is evenly distributed circumferentially along the inner wall of the rotating component. The number and distribution of the protrusions are consistent with the number and distribution of the pressure blocks. One of the protrusions and the pressure block gradually thickens circumferentially from their contact end to the other end. The rotating component is fitted over the inner rod through-sleeve portion and the pressure block and is capable of rotating around an axis. This structure uses a slanted cam or wedge-shaped drive for the pressure block, and locking and unlocking are achieved by rotating the rotating component clockwise and counterclockwise.

[0004] The object of this invention is to find a more reasonable technical solution. Summary of the Invention:

[0005] The purpose of this invention is to design a telescopic tube locking structure that achieves locking and unlocking through a push-pull operation.

[0006] The present invention is implemented as follows: a telescopic pipe locking structure includes an outer pipe, an inner pipe, and a locking mechanism. The inner pipe is inserted into the outer pipe, and the locking mechanism is disposed at the connection end between the outer pipe and the inner pipe. The locking mechanism is characterized in that: the locking mechanism includes a push-pull sleeve and a clamping sleeve. The clamping sleeve has a nested section that is embedded in the end of the outer pipe and a clamping section that can be partially retracted to clamp the inner pipe. The push-pull sleeve is movably sleeved outside the clamping sleeve, and the push-pull movement drives the clamping sleeve to lock or release the inner pipe.

[0007] The clamping sleeve has an anti-detachment protrusion ring or annular protrusions at the junction of the nested section and the clamping section. Both ends of the push-pull sleeve have a constricted structure. The constriction corresponding to the end of the clamping section is small, with a diameter larger than the diameter of the inner tube but smaller than the diameter of the end of the clamping section. The constriction corresponding to the end of the nested section is large, with a diameter larger than the diameter of the outer tube but smaller than the diameter of the anti-detachment protrusion ring. The push-pull sleeve is fitted into the clamping sleeve from the large constriction end, and slides over the anti-detachment protrusion ring or protrusions with an interference fit.

[0008] The inner cavity of the push-pull sleeve is divided into a large-diameter stroke cavity and a small-diameter clamping cavity, with a driving slope at the junction of the two. The clamping cavity corresponds to the clamping section of the clamping sleeve. The push-pull sleeve is pushed towards the stroke cavity, and the driving slope squeezes the clamping section to generate a contraction action.

[0009] The clamping section of the clamping sleeve has the following two structures: 1. The circumferential surface of the clamping section is formed with two or more U-shaped grooves, and the clamping tongue piece divided by the U-shaped grooves has a wedge-shaped cross-section, which can be driven by the driving inclined surface of the push-pull sleeve to shrink and deform inward; 2. The circumferential surface of the clamping section is divided into clamping lobes by three or more axial grooves, and the clamping lobes have a wedge-shaped cross-section, which can be driven by the driving inclined surface of the push-pull sleeve to shrink and deform inward.

[0010] The nested section of the clamping sleeve has one or more locking points protruding on its circumferential surface, and the corresponding position of the outer tube has a through hole; the nested section is inserted into the outer tube in place, and the anti-detachment protrusion ring or protrusion at the junction rests on the end of the outer tube, and the locking point is embedded in the through hole for positioning.

[0011] The clamping sleeve has an axially open through groove.

[0012] The clamping tongue has a wedge-shaped disc or a wedge-shaped semicircle at its end, which can be driven inward by the driving slope of the push-pull sleeve and enter the clamping cavity.

[0013] The anti-detachment protrusion or dot has a chamfered bevel at the insertion end of the push-pull sleeve.

[0014] The inner tube has a ring sleeve on the embedded section. The ring sleeve is placed between the inner tube and the outer tube and can abut against the clamping sleeve when stretched to the designed limit position.

[0015] The inner tube fitting is also fitted with an end cap at the end of the embedded section. Both the end cap and the ring have a locking block formed on their inner surfaces. The mating surface of the inner tube fitting is machined with a corresponding through hole. The locking block is inserted into the through hole to form a positioning. The ring has an axial groove.

[0016] This utility model features a unique design, simple structure, and convenient operation. In particular, the push-pull sleeve and the clamping sleeve are axially fitted, and the locking and unlocking operations are achieved through the pushing and pulling action of the push-pull sleeve, which facilitates the application of force. Furthermore, the push-pull sleeve and the clamping sleeve are assembled with an interference fit, so the push-pull sleeve is not easy to slip off, and it also has a stroke limit, making it suitable for use on various telescopic pipe fittings. Attached image description:

[0017] The invention will be further described below with reference to specific figures:

[0018] Figure 1 Schematic diagram of telescopic tube locking structure

[0019] Figure 2 Schematic diagram of the cross-section of the telescopic tube locking structure

[0020] Figure 3 Exploded view of the telescopic tube locking structure

[0021] Figure 4 Schematic diagram of clamping sleeve

[0022] Figure 5 Schematic diagram of clamping sleeve 2

[0023] Figure 6 Schematic diagram of the cross section of the push-pull sleeve

[0024] in

[0025] 1—Outer fitting; 11—Perforation;

[0026] 2—Inner tube fitting; 21—Through hole;

[0027] 3—Push-pull sleeve; 31—Stroke cavity; 32—Clamping cavity; 33—Drive inclined surface; 34—Small constriction; 35—Large constriction;

[0028] 4—Clamping sleeve; 41—Nested section; 411—Clamping point; 42—Clamping section; 43—Anti-detachment protrusion ring; 431—Chamfered bevel;

[0029] 44—U-shaped groove; 45—Clamping tongue; 451—Wedge-shaped disc; 46—Axial groove; 47—Clamping flap;

[0030] 48—Open through slot;

[0031] 5—Ring; 50—Slot; 51—End cap; 52—Clamping block; Detailed implementation method:

[0032] Reference Figures 1 to 4 The telescopic pipe locking structure includes an outer pipe fitting 1, an inner pipe fitting 2, and a locking mechanism. The locking mechanism is located at the connection end between the outer pipe fitting 1 and the inner pipe fitting 2, and is used to lock the telescopic position of the inner pipe fitting 2. The locking mechanism includes a push-pull sleeve 3 and a clamping sleeve 4 through which the inner pipe fitting slides. The clamping sleeve 4 has a nested section 41 and a clamping section 42. The nested section 41 is fixed to the end of the outer pipe fitting 1. The clamping section 42 can partially retract to clamp the inner pipe fitting 2, forming a friction lock. The push-pull sleeve 3 is movably sleeved outside the clamping sleeve 4, and the push-pull movement drives the clamping sleeve 4 to lock or release the inner pipe fitting 2.

[0033] In a preferred embodiment, the clamping sleeve has an anti-detachment protrusion ring 43 or annularly distributed protrusions at the junction of the nested section 41 and the clamping section 42. Both ends of the push-pull sleeve 3 have a constricted structure. The constriction corresponding to the end of the clamping section 42 is a small constriction 34, the diameter of which is larger than the diameter of the inner tube 2 but smaller than the diameter of the end of the clamping section 42. This allows the inner tube to pass through while also resting on the end of the clamping section 42, forming a downward limit. The constriction corresponding to the end of the nested section 41 is a large constriction 35, the diameter of which is larger than the diameter of the outer tube 1 but smaller than the diameter of the anti-detachment protrusion ring 43. This allows for free push-pull operation on the outer tube while being constrained by the anti-detachment protrusion ring 43, forming an upward limit. The push-pull sleeve is fitted into the clamping sleeve 4 from the large constriction 35 end, and slides over the anti-detachment protrusion ring 43 or protrusions with an interference fit. For this purpose, the anti-detachment protrusion ring 43 or protrusions have a chamfered bevel 431 facing the fitting end of the push-pull sleeve 3, making it easier to slide over the chamfered bevel 431 during assembly.

[0034] Combination Figure 6 Furthermore, the inner cavity of the push-pull sleeve 3 is divided into a large-diameter stroke cavity 31 and a small-diameter clamping cavity 32, with a driving slope 33 at the junction of the two. The clamping cavity 32 corresponds to the clamping section 42 of the clamping sleeve. The push-pull sleeve 3 is pushed towards the stroke cavity 31, and the driving slope 33 squeezes the clamping section 42 to generate a contraction action.

[0035] The clamping section 42 of the clamping sleeve has the following two structures:

[0036] I. For example Figure 4 The clamping section 42 has two or more U-shaped grooves 44 formed on its circumferential surface. The clamping tongue 45, divided by the U-shaped grooves 44, has a wedge-shaped cross-section and can be driven by the driving inclined surface 33 of the push-pull sleeve to retract and deform inward. More specifically, the end of the clamping tongue 45 has a wedge-shaped disc 451 or a wedge-shaped semi-circular disc, which can be driven by the driving inclined surface 33 of the push-pull sleeve to retract inward and enter the clamping cavity 32. The large deformation at the end of the clamping tongue 45 makes the driving operation easier while still achieving the purpose of squeezing the inner tube.

[0037] II. Figure 5 The circumferential surface of the clamping section 42 is divided into several clamping segments 47 by three or more axial grooves 46. The clamping segments 47 have a wedge-shaped cross-section and can be driven by the driving inclined surface 33 of the push-pull sleeve to shrink and deform inward, thereby clamping the inner tube 2. In this structure, the easily deformable wedge-shaped part is located at the end of the clamping section 42, which is the opposite of the previous example. At this time, the driving inclined surface 33 on the push-pull sleeve also needs to be moved upward appropriately to achieve the same effect.

[0038] Furthermore, the nested section 41 of the clamping sleeve has one or more locking points 411 protruding on its circumferential surface, and the outer tube 1 has a corresponding perforation 11. The nested section 41 is inserted into the outer tube 1 in place, and the anti-detachment protrusion ring 43 or protrusion at the junction rests on the end of the outer tube 1. The locking point 411 is positioned by being inserted into the perforation 11. The locking point 411 and the perforation 11 cooperate to achieve a reliable fixing structure. To facilitate assembly and ensure the reliability of the fixing, the clamping sleeve 4 has an open through groove 48 in the axial direction. Due to the existence of the open through groove 48, the clamping sleeve 4 can be appropriately contracted radially to facilitate insertion during assembly and avoid difficulty in interference insertion due to the locking point 411. The open through groove 48 does not affect the axial positioning and has a positive effect on the clamping action of the inner tube.

[0039] The inner tube 2 has a ring 5 on its embedded section. This ring 5 is placed between the inner tube 2 and the outer tube 1, and when stretched to its designed limit, it abuts against the clamping sleeve 4 to prevent the inner tube 2 from accidentally detaching. Additionally, the inner tube 2 has an end cap 51 fitted at the end of its embedded section. Both the end cap 51 and the ring 5 have locking blocks 52 formed on their inner surfaces. The mating surface of the inner tube 2 has corresponding through holes 21, which are positioned by the locking blocks 52 fitting into the through holes 21. The ring 5 has an axial slot 50 for easy insertion during assembly. The ring 5 and the end cap 51 also eliminate gaps between the inner and outer tubes, ensuring that their axes are aligned during use, reducing sway and instability caused by gaps. For example, a telescopic tube can be used with a mop for a better user experience.

Claims

1. A telescopic pipe locking structure, comprising an outer pipe fitting (1), an inner pipe fitting (2), and a locking mechanism, wherein the inner pipe fitting (2) passes through the outer pipe fitting (1), and the locking mechanism is disposed at the connection end between the outer pipe fitting (1) and the inner pipe fitting (2); characterized in that: The locking mechanism includes a push-pull sleeve (3) and a clamping sleeve (4). The clamping sleeve (4) has a nested section (41) that is embedded in the end of the outer tube (1) and a clamping section (42) that can be partially retracted to clamp the inner tube (2). The push-pull sleeve (3) is movably sleeved outside the clamping sleeve (4), and the push-pull movement drives the clamping sleeve (4) to lock or release the inner tube (2).

2. The telescopic tube locking structure according to claim 1, characterized in that: The clamping sleeve has an anti-detachment protrusion ring (43) or a ring-shaped distribution of protrusions at the junction of the nested section (41) and the clamping section (42). Both ends of the push-pull sleeve (3) are constricted structures. The one corresponding to the end of the clamping section (42) is a small constriction (34), whose diameter is larger than the diameter of the inner tube (2) but smaller than the diameter of the end of the clamping section (42). The one corresponding to the end of the nested section (41) is a large constriction (35), whose diameter is larger than the diameter of the outer tube (1) but smaller than the diameter of the anti-detachment protrusion ring (43). The push-pull sleeve is fitted into the clamping sleeve (4) from the end of the large constriction (35) and slides over the anti-detachment protrusion ring (43) or protrusions with interference fit.

3. A telescopic tube locking structure according to claim 1 or 2, characterized in that: The inner cavity of the push-pull sleeve (3) is divided into a large-diameter stroke cavity (31) and a small-diameter clamping cavity (32), and the junction of the two is a driving slope (33); the clamping cavity (32) corresponds to the clamping section (42) of the clamping sleeve. The push-pull sleeve (3) is pushed towards the stroke cavity (31), and the clamping section (42) is squeezed by the driving slope (33) to generate a contraction action.

4. The telescopic tube locking structure according to claim 3, characterized in that: The clamping section (42) of the clamping sleeve has the following two structures: First, the circumferential surface of the clamping section (42) is formed with two or more U-shaped grooves (44), and the clamping tongue (45) divided by the U-shaped groove (44) has a wedge-shaped cross section, which can be driven by the driving inclined surface (33) of the push-pull sleeve to shrink and deform inward; Second, the circumferential surface of the clamping section (42) is divided into several clamping petals (47) by three or more axial grooves (46), and the cross section of the clamping petals (47) has a wedge-shaped cross section, which can be driven by the driving inclined surface (33) of the push-pull sleeve to shrink and deform inward.

5. The telescopic tube locking structure according to claim 4, characterized in that: The nested section (41) of the clamping sleeve has one or more locking points (411) protruding on its circumferential surface, and the outer tube (1) has a perforation (11) machined at the corresponding position; the nested section (41) is embedded into the outer tube (1) in place, and the anti-detachment protrusion ring (43) or protrusion at the junction rests on the end of the outer tube (1), and the locking point (411) is embedded in the perforation (11) for positioning.

6. The telescopic tube locking structure according to claim 5, characterized in that: The clamping sleeve (4) has an open through groove (48) in the axial direction.

7. The telescopic tube locking structure according to claim 4, characterized in that: The end of the clamping tongue (45) has a wedge-shaped disc (451) or a wedge-shaped semicircle, which can be driven to retract inward by the driving slope (33) of the push-pull sleeve and enter the clamping cavity (32).

8. A telescopic tube locking structure according to claim 2, characterized in that: The anti-detachment protrusion ring (43) or protrusion has a chamfered bevel (431) at the end of the push-pull sleeve (3) assembly.

9. A telescopic tube locking structure according to claim 1 or 2, characterized in that: The inner tube (2) has a ring (5) on the embedded section. The ring (5) is placed between the inner tube (2) and the outer tube (1) and can abut against the clamping sleeve (4) when stretched to the designed limit position.

10. A telescopic tube locking structure according to claim 9, characterized in that: The inner tube (2) is also fitted with an end cap (51) at the end of the embedded section. Both the end cap (51) and the ring sleeve (5) have a locking block (52) formed on their inner surfaces. The inner tube (2) has a corresponding through hole (21) on its mating surface. The locking block (52) is inserted into the through hole (21) to form a positioning. The ring sleeve (5) has an axial groove (50).

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