A kind of middle rod of multi-fold umbrella

Abstract

The invention discloses a middle rod of a multi-fold umbrella, comprising an outer tube, an inner tube, an upper nest axially fixedly connected to one end of the outer tube and a connecting rod located in the outer tube, a connecting bolt with a clamping block is arranged on the outer sleeve of one end of the connecting rod, and one end of the connecting rod is fixedly connected to the bottom end of the upper nest by the connecting bolt; the other end of the connecting rod is located in the inner tube and is connected with an arc-shaped protrusion; one end of the inner tube close to the upper nest is fixedly connected with a limiting sleeve, one end of the limiting sleeve is provided with a limiting groove, the groove bottom of the limiting groove is provided with a limiting hole for the connecting rod to pass through, the groove wall of the limiting groove is provided with a clamping groove for the clamping block to clamp, and the other end of the limiting sleeve extends toward the inner tube and is provided with an arc groove clamped with the arc-shaped protrusion; through the connecting bolt, the connecting rod, the clamping block, the limiting sleeve, the limiting groove, the limiting hole, the arc-shaped protrusion and the arc groove, the inner tube is locked in the two ends of the connecting rod respectively when the middle rod is folded and extended, the overall buckling is stable, the stability of the overall structure when the middle rod is folded or extended is enhanced, and the safety is high.

Description

Technical Field

[0001] The invention relates to the technical field of umbrella parts, and more particularly to a middle rod of a multi-fold umbrella. Background Art

[0002] Umbrellas, as a kind of sunshade or rainproof tool used by people in daily life, are a kind of essential product in people's lives. Among them, folding umbrellas have become a must-have item for our home travel because they are easy to carry. Folding umbrellas are composed of multiple umbrella tubes. When the umbrella is folded, the sections of the tubes of the multiple folding rods are buckled together. Through the marbles or slingshots set in the tubes and the corresponding lock bead holes opened on the tubes, the retracted sections of the tubes are buckled in a fixed position. However, since the space between the inner and outer tubes is too small, using this method to buckle the pipe fittings is prone to insufficient buckling force, poor connection stability between the sections of the tubes, and gaps between the marbles or slingshots and the lock bead holes. Fingers are often scratched or pinched due to accidental touches. There is a problem of poor safety, which makes the middle rod unsmooth to use. At the same time, multiple openings destroy the strength of the middle rod itself and reduce the stability of the structure of the middle rod itself. Summary of the invention

[0003] In view of the shortcomings of the prior art, the object of the present invention is to provide a middle rod for a multi-fold umbrella, which has the advantages of good stability and high safety.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A middle rod of a multi-fold umbrella comprises an outer tube, an inner tube and an upper nest axially fixedly connected to one end of the outer tube, and also comprises a connecting rod located in the outer tube, a connecting bolt is arranged outside one end of the connecting rod, one end of the connecting rod is fixedly connected to the bottom end of the upper nest through the connecting bolt, and a clamping block is arranged on the connecting bolt; the other end of the connecting rod is located in the inner tube and is connected with an arc-shaped protrusion; one end of the inner tube close to the upper nest is fixedly connected to a limiting sleeve, one end of the limiting sleeve is provided with a limiting groove for the reciprocating sliding of the connecting bolt, the bottom of the limiting groove is provided with a limiting hole for the connecting rod to pass through, the groove wall of the limiting groove is provided with a clamping groove for the clamping block to be clamped, and the other end of the limiting sleeve extends toward the inner tube and is provided with an arc groove clamped with the arc-shaped protrusion.

[0006] It is further configured that: a through hole is provided at the top of the upper nest for the connecting bolt, the blocking block and the connecting rod to pass through; the connecting bolt is connected to a limiting cap at one end away from the inner tube; an annular stopper is connected to the end of the upper nest close to the inner tube for the limiting cap to be placed; an internal threaded hole is provided on the inner side of the annular stopper; an external threaded hole connected to the internal threaded hole is provided on the outer peripheral surface of the connecting bolt; and the arc-shaped protrusion is detachably connected to the other end of the connecting rod.

[0007] It is further configured that: the end of the connecting bolt away from the inner tube is connected to a limiting cap, the top of the upper nest is provided with a sliding groove for the limiting cap to slide back and forth, the bottom of the sliding groove is provided with a sliding hole for the connecting bolt, the block and the connecting rod to pass through, the notch of the sliding groove is threadedly connected with a limiting block with a T-shaped cross-section, the limiting cap is abutted against the bottom of the sliding groove through the vertical end of the limiting block, and the arc-shaped protrusion is detachably connected to the other end of the connecting rod.

[0008] It is further arranged that a sealing gasket is sleeved between the horizontal end of the limit stopper and the upper nest.

[0009] It is further provided that: a guide groove which gradually expands toward the direction approaching the upper nest is formed at the notch of the limiting groove, and a notch is formed on the outer peripheral surface of the limiting sleeve.

[0010] It is further provided that: a rotating part is radially extended outwardly at one end of the outer tube close to the upper nest, and a rotating groove for placing the rotating part is provided on the inner side surface of the upper nest.

[0011] It is further configured that the cross section of the connecting rod is configured as a rounded rectangle, and the cross sections of the limiting groove and the limiting hole are configured as rounded rectangles.

[0012] It is further configured that an anti-scratch cover is provided between the end of the outer tube away from the upper nest and the inner tube, the anti-scratch cover is connected to the outer tube, and the anti-scratch cover is provided with a guide portion extending toward the upper nest.

[0013] Further configuration: one side surface of the clamping block is configured in an arc shape.

[0014] It is further provided that: the limiting sleeve and the inner tube are integrally formed.

[0015] To summarize, the present invention clamps the connecting bolt and the limiting sleeve through the connecting bolt, the connecting rod, the clamping block, the limiting sleeve, the limiting groove, the through hole and the limiting hole, so that the inner tube and the upper nest are detachably fixedly connected through the limiting sleeve and the connecting bolt, and then the inner tube is locked in the outer tube when the middle rod is folded, the overall buckle is firm, and the overall stability of the middle rod when folded is enhanced; the limiting sleeve, the connecting rod, the arc-shaped protrusion and the arc-shaped groove are used to lock the inner tube to the other end of the connecting rod when the middle rod is extended; the overall buckle is firm, and the stability of the inner tube and the outer tube when the middle rod is extended is enhanced; and since there is no need to destroy the strength of the middle rod itself by opening a hole on the inner tube or the outer tube, the structural stability of the middle rod itself is further guaranteed; in addition, since the limiting sleeve, the connecting bolt, the arc-shaped groove and the arc-shaped protrusion are all located in the outer tube, the safety of the use of the middle rod is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is a partial structural diagram of Embodiment 1 of the present invention;

[0017] Figure 2 It is an exploded view of embodiment 1 of the present invention;

[0018] Figure 3 This is a cross-sectional view of Example 1 of the present invention:

[0019] Figure 4 is a cross-sectional view of embodiment 2 of the present invention;

[0020] Figure 5 It is a schematic diagram of the local structure of the present invention.

[0021] In the figure: 1. outer tube; 2. inner tube; 3. upper nest; 4. connecting rod; 5. connecting bolt; 6. clamping block; 7. arc-shaped protrusion; 8. limiting sleeve; 9. limiting groove; 10. limiting hole; 11. clamping groove; 12. arc-shaped groove; 13. through hole; 14. limiting cap; 15. annular block; 16. internal threaded hole; 17. external threaded hole; 18. sliding groove; 19. sliding hole; 20. limiting block; 21. sealing gasket; 22. guide groove; 23. notch; 24. anti-scratch sleeve; 25. guide part; 26. rotating part; 27. rotating groove. DETAILED DESCRIPTION

[0022] In order to explain the technical content, purpose and effect of the present invention in detail, the following is a description of the embodiments and the accompanying drawings. It should be noted that the terms "bottom" and "top" used in the following description refer to the attached Figure 1 The direction toward the geometric center of a specific component.

[0023] The most critical concept of the present invention is: through the connecting bolt 5, the clamping block 6, the limiting sleeve 8, the limiting groove 9, the clamping groove 11, the through hole 13 and the limiting hole 10, the connecting bolt 5 is clamped with the limiting sleeve 8, so that the inner tube 2 can be detachably fixedly connected to one end of the connecting rod 4, and then the inner tube 2 is locked in the outer tube 1, and the overall buckling is firm, which enhances the overall stability of the middle rod when it is folded; the inner tube 2 is pulled outward toward the outer tube 1 to release the clamping block 6 and the clamping groove 11, and at the same time, the arc-shaped projection 7 and the arc-shaped groove 12 are used to make the arc-shaped projection 7 and the arc-shaped projection 12 be fixedly connected to the inner tube 2. The projection 7 is engaged with the arc groove 12, thereby realizing the function of locking the inner tube 2 to the other end of the connecting rod 4 when the middle rod is extended; the overall buckling is firm, which enhances the stability of the structure of the inner tube 2 and the outer tube 1 when the middle rod is extended, and since there is no need to destroy the strength of the middle rod itself by opening a hole on the inner tube 2 or the outer tube 1, it further ensures the structural stability of the middle rod itself; in addition, since the limiting sleeve 8, the connecting bolt 5, the arc groove 12 and the arc projection 7 are all located in the outer tube 1, the safety of the use of the middle rod is further improved.

[0024] Please refer to Figures 1 to 5As shown, a multi-fold umbrella middle rod comprises an outer tube 1, an inner tube 2 and an upper nest 3 axially fixedly connected to one end of the outer tube 1, and also comprises a connecting rod 4 located in the outer tube 1, one end of the connecting rod 4 is provided with a connecting bolt 5, one end of the connecting rod 4 is fixedly connected to the bottom end of the upper nest 3 through the connecting bolt 5, and a clamping block 6 is provided on the connecting bolt 5; the other end of the connecting rod 4 is located in the inner tube 2 and is connected with an arc-shaped protrusion 7; one end of the inner tube 2 close to the upper nest 3 is fixedly connected to a limiting sleeve 8, one end of the limiting sleeve 8 is provided with a limiting groove 9 for the connecting bolt 5 to slide back and forth, the groove bottom of the limiting groove 9 is provided with a limiting hole 10 for the connecting rod 4 to pass through, the groove wall of the limiting groove 9 is provided with a clamping groove 11 for the clamping block 6 to engage, and the other end of the limiting sleeve 8 extends toward the inner tube 2 and is provided with an arc groove 12 engaged with the arc-shaped protrusion 7.

[0025] When the cam 1 is in the closed position, the locking nut 6 is engaged with the locking nut 6 on the locking nut 5, and the locking nut 6 is engaged with the locking nut 6 on the locking nut 6. When the cam 1 is in the closed position, the locking nut 6 is engaged with the locking nut 6 on the locking nut 6. When the cam 1 is in the closed position, the locking nut 6 is engaged with the locking nut 6 on the locking nut 6. The inner tube 2 is locked in the connection inside the outer tube 1; thereafter, the inner tube 2 continues to be moved away from the outer tube 1 until the arc-shaped protrusion 7 connected to the other end of the connecting rod 4 is engaged with the arc-shaped groove 12 set at the other end of the limiting sleeve 8. Since the other end of the connecting rod 4 is fixedly connected to the bottom end of the upper nest 3 by the connecting bolt 5, one end of the outer tube 1 is fixedly connected to the upper nest 3, thereby realizing the function of locking the inner tube 2 to the other end of the connecting rod 4 when the middle rod is extended; the overall buckling is firm, which enhances the stability of the inner tube 2 and the outer tube 1 when the middle rod is extended, and the arc-shaped groove 12 and the arc-shaped protrusion 7 are both located in the outer tube 1, which further improves the safety of the use of the middle rod; in addition, no matter whether the middle rod is folded or telescopic, since there is no need to destroy the strength of the middle rod itself by opening a hole on the inner tube 2 or the outer tube 1, the structural stability of the middle rod itself is further ensured.

[0026] Furthermore: a through hole 13 is provided at the top of the upper nest 3 for the connecting bolt 5, the block 6 and the connecting rod 4 to pass through, the end of the connecting bolt 5 away from the inner tube 2 is connected to a limiting cap 14, and the end of the upper nest 3 close to the inner tube 2 is connected to an annular stopper 15 for placing the limiting cap 14, an internal threaded hole 16 is provided on the inner side of the annular stopper 15, and an external threaded hole 17 connected to the internal threaded hole 16 is provided on the outer peripheral surface of the connecting bolt 5, and the arc-shaped protrusion 7 is detachably connected to the other end of the connecting rod 4.

[0027] From the above description, it can be known that when it is necessary to assemble the connecting rod 4, the connecting bolt 5 and the upper nest 3, first the connecting bolt 5, the connecting rod 4 and the block 6 are passed through the through hole 13 opened at the top of the upper nest 3, and the connecting bolt 5 is rotated until the limit cap 14 abuts against the annular block 15, so that the external threaded hole 17 opened on the outer peripheral surface of the connecting bolt 5 is connected with the external threaded hole 17 opened on the inner side of the annular block 15, thereby realizing the function of the connecting bolt 5 being detachably fixedly connected to the bottom end of the upper nest 3. At the same time, when the connecting rod 4 or the block 6 is damaged, the arc-shaped protrusion 7 is first loosened, and then the connecting bolt 5 is loosened, and finally the connecting rod 4 and the connecting bolt 5 are pulled out from the through hole 13, thereby facilitating the rapid replacement of the connecting rod 4 and the connecting bolt 5; in addition, the troublesome process of gluing and fixing is omitted, and the production and processing are convenient and environmentally friendly.

[0028] Furthermore: the end of the connecting bolt 5 away from the inner tube 2 is connected to the limit cap 14, and a slide groove 18 is provided at the top of the upper nest 3 for the limit cap 14 to slide back and forth. The bottom of the slide groove 18 is provided with a sliding hole 19 for the connecting bolt 5, the block 6 and the connecting rod 4 to pass through. The notch of the slide groove 18 is threadedly connected with a limit block 20 with a T-shaped cross section. The limit cap 14 is abutted against the bottom of the slide groove 18 through the vertical end of the limit block 20, and the arc-shaped protrusion 7 is detachably connected to the other end of the connecting rod 4.

[0029] From the above description, it can be known that when it is necessary to assemble the connecting rod 4, the connecting bolt 5 and the upper nest 3, the connecting bolt 5, the connecting rod 4 and the block 6 are first passed through the slide groove 18 and the sliding hole 19 opened at the top of the upper nest 3 in sequence, and then, the limit stopper 20 threadedly connected to the notch of the slide groove 18 is tightened until the vertical end of the limit stopper 20 abuts the limit cap 14 against the bottom of the groove of the slide groove 18, thereby achieving the effect of fixing the connecting bolt 5 to the bottom end of the upper nest 3; at the same time, when the connecting rod 4 or the block 6 is damaged, the arc-shaped protrusion 7 is first loosened, and then the limit stopper 20 is loosened, and finally the connecting rod 4 and the connecting bolt 5 are pulled out from the through hole 13, thereby facilitating the rapid replacement of the connecting rod 4 and the connecting bolt 5; in addition, the troublesome process of gluing and fixing is omitted, and the production and processing are convenient and environmentally friendly.

[0030] Furthermore, a sealing gasket 21 is sleeved between the lateral end of the limit stopper 20 and the upper nest 3 .

[0031] From the above description, it can be known that by sleeved between the lateral end of the limit stopper 20 and the upper nest 3, the sealing gasket 21 is prevented from rusting the outer tube 1 and the inner tube 2 due to water entering the outer tube 1 and the inner tube 2 from the limit stopper 20 through the slide groove 18 and the sliding hole 19, thereby playing a role of sealing and waterproofing.

[0032] Furthermore, a guide groove 22 which gradually expands toward the direction approaching the upper nest 3 is formed at the notch of the limiting groove 9 , and a notch 23 is formed on the outer peripheral surface of the limiting sleeve 8 .

[0033] From the above description, it can be seen that by opening the guide groove 22 at the notch of the limiting groove 9 and gradually expanding toward the upper nest 3, it is convenient for the block 6 to better pass through the limiting groove 9 and enter the slot 11; by opening the notch 23 on the outer peripheral surface of the limiting sleeve 8, the elasticity of the limiting sleeve 8 is increased, which further facilitates the block 6 to slide into the slot 11.

[0034] Furthermore, a rotating portion 26 is provided at one end of the outer tube 1 close to the upper nest 3 and radially extends outward, and a rotating groove 27 for placing the rotating portion 26 is provided on the inner side surface of the upper nest 3 .

[0035] From the above description, it can be seen that when it is windy, the rotating portion 26 extending along the outer radial direction and arranged at one end of the outer tube 1 close to the upper nest 3 rotates in the rotating groove 27, thereby driving the outer tube 1 to rotate around the central axis of the upper nest 3. In the case of wind, the ribs are prevented from bending and deforming upward and downward due to the influence of wind force, thereby further enhancing the overall stability and safety.

[0036] Furthermore: the cross section of the connecting rod 4 is set to be a rounded rectangular shape, and the cross sections of the limiting groove 9 and the limiting hole 10 are set to be a rounded rectangular shape.

[0037] From the above description, it can be seen that the cross-sections of the connecting rod 4, the limiting groove 9 and the limiting hole 10 are all set to be rounded rectangles. During the extension and retraction process of the inner tube 2, damage to the block 6, the arc-shaped protrusion 7 and the limiting sleeve 8 caused by the rotation of the inner tube 2 caused by the rotation of the connecting rod 4 is avoided, and damage to the outer surface of the limiting sleeve 8 and the limiting hole 10 caused by the sliding and collision of the connecting rod 4 in the limiting sleeve 8 is avoided, which plays a role in extending the overall service life and enhancing the overall safety of use; at the same time, the stability of the connection between the inner tube 2 and the connecting rod 4 is enhanced, thereby further enhancing the overall stability.

[0038] Furthermore, an anti-scratch cover 24 is provided between the end of the outer tube 1 away from the upper nest 3 and the inner tube 2 . The anti-scratch cover 24 is connected to the outer tube 1 . The anti-scratch cover 24 is provided with a guide portion 25 extending toward the upper nest 3 .

[0039] As can be seen from the above description, by means of the anti-scratch cover 24 provided between the end of the outer tube 1 away from the upper nest 3 and the inner tube 2, the outer surface of the inner tube 2 is prevented from contacting the inner surface of the end of the outer tube 1 away from the upper nest 3, thereby preventing the outer surface of the inner tube 2 from being scratched by the outer tube 1 and causing scratches that affect the appearance, and preventing the end of the outer tube 1 away from the upper nest 3 from colliding with the user's hand during the extension and contraction of the outer tube 1 and the inner tube 2, thereby further enhancing the overall safety; the guide portion 25 extending toward the upper nest 3 by the anti-scratch cover 24 plays a role in protecting the inner tube 2 and the outer tube 1, while further enabling the inner tube 2 to slide back and forth in a directional manner in the length direction of the connecting rod 4.

[0040] Furthermore: one side surface of the clamping block 6 is arranged in an arc shape.

[0041] From the above description, it can be seen that in the process of the block 6 contacting with the groove walls of the groove 11 and the limiting groove 9, by setting one side of the block 6 to be arc-shaped, the friction between the block 6 and the groove 11 and the limiting groove 9 is reduced, thereby reducing the resistance during the extension and contraction of the inner tube 2 and enhancing the overall convenience of use; at the same time, the damage to the groove 11, the limiting groove 9 and the block 6 caused by the uneven contact surface between the buckle and the groove 11 and the limiting groove 9 is reduced, thereby extending the overall service life.

[0042] Furthermore: the limiting sleeve 8 and the inner tube 2 are integrally formed.

[0043] From the above description, it can be seen that the limit sleeve 8 is integrally formed on the inner tube 2. When the inner tube 2 slides along the length direction of the connecting rod 4 and is locked or unlocked, the limit sleeve 8 is firmly combined with the connecting rod 4 and is not easy to shake or fall off, thereby ensuring the stability and safety of the structure of the inner tube 2 and the limit sleeve 8. At the same time, the troublesome process of gluing and fixing is omitted, and the production and processing is convenient and environmentally friendly.

[0044] Reference Figures 1 to 5 , Embodiment 1 provided by the present invention is:

[0045] A multi-fold umbrella middle stick, such as Figure 1 and Figure 2 As shown, it includes an outer tube 1, an inner tube 2, an upper nest 3 and a connecting rod 4; the upper nest 3 is axially fixedly connected to one end of the outer tube 1, the outer tube 1 is sleeved outside the inner tube 2, and a connecting bolt 5 is provided on one end of the connecting rod 4. The connecting bolt 5 and the connecting rod 4 are both located in the outer tube 1, and one end of the connecting rod 4 is fixedly connected to the bottom end of the upper nest 3 through the connecting bolt 5.

[0046] like Figure 2 and Figure 3As shown, one end of the inner tube 2 close to the upper nest 3 is fixedly connected to the limiting sleeve 8, and the limiting sleeve 8 is integrally formed with the inner tube 2; a notch 23 is provided on the outer circumferential surface of the limiting sleeve 8; a limiting groove 9 is provided at one end of the limiting sleeve 8 for the reciprocating sliding of the connecting bolt 5, and a guide groove 22 gradually expanding toward the direction close to the upper nest 3 is provided at the notch of the limiting groove 9; a limiting hole 10 is provided at the bottom of the limiting groove 9 for the connecting rod 4 to pass through, and a clamping groove 11 is provided on the groove wall of the limiting groove 9, and the other end of the limiting sleeve 8 extends toward the inner tube 2 and is provided with an arc groove 12; one end of the outer tube 1 close to the upper nest 3 is radially extended outward to be provided with a rotating part 26, and the inner side surface of the upper nest 3 is provided with a rotating groove 27 for the rotating part 26 to be placed, and the rotating part 26 can specifically be an annular protrusion, a bearing or other forms.

[0047] like Figure 1 and Figure 2 As shown, a clamping block 6 is provided on the connecting bolt 5, and the clamping block 6 is clamped in the clamping groove 11, and one side of the clamping block 6 is arranged in an arc shape; the other end of the connecting rod 4 is located in the inner tube 2, and the end of the connecting bolt 5 away from the inner tube 2 is connected to the limiting cap 14;

[0048] like Figure 2 and Figure 5 As shown, the other end of the connecting rod 4 is detachably connected with an arc-shaped protrusion 7, and the arc-shaped protrusion 7 is clamped in the arc-shaped groove 12;

[0049] like Figure 1 and Figure 3 As shown, a slide groove 18 is provided at the top of the upper nest 3 for the reciprocating sliding of the limit cap 14, and a sliding hole 19 is provided at the bottom of the slide groove 18 for the connecting bolt 5, the block 6 and the connecting rod 4 to pass through. The notch of the slide groove 18 is threadedly connected with a limit stopper 20 with a T-shaped cross section, and a sealing gasket 21 is sleeved between the horizontal end of the limit stopper 20 and the upper nest 3; the limit cap 14 is abutted against the bottom of the slide groove 18 through the vertical end of the limit stopper 20.

[0050] like Figure 1 and Figure 2 As shown, the cross section of the connecting rod 4 is in the shape of a rounded rectangle, and the cross sections of the limiting groove 9 and the limiting hole 10 are in the shape of a rounded rectangle.

[0051] like Figure 2 and Figure 3 As shown, an anti-scratch cover 24 is provided between the end of the outer tube 1 away from the upper nest 3 and the inner tube 2 . The anti-scratch cover 24 is connected to the outer tube 1 , and the anti-scratch cover 24 is provided with a guide portion 25 extending toward the upper nest 3 .

[0052] Embodiment 2: The difference from embodiment 1 is that Figure 4As shown, a through hole 13 is provided at the top of the upper nest 3 for the connecting bolt 5, the block 6 and the connecting rod 4 to pass through; an annular stopper 15 is connected to the end of the upper nest 3 close to the inner tube 2 for the limiting cap 14 to be placed, an internal threaded hole 16 is provided on the inner side of the annular stopper 15, and an external threaded hole 17 connected to the internal threaded hole 16 is provided on the outer peripheral surface of the connecting bolt 5.

[0053] In summary, compared with the prior art, the present invention has the advantages of good stability and high safety. Through the connecting bolt 5, the connecting rod 4, the clamping block 6, the limiting sleeve 8, the limiting groove 9 and the limiting hole 10; the connecting bolt 5 is clamped with the limiting sleeve 8, so that the inner tube 2 and the upper nest 3 are detachably fixedly connected through the limiting sleeve 8 and the connecting bolt 5, so that when the middle rod is folded, the inner tube 2 is locked in the outer tube 1, the overall buckling is firm, and the overall stability of the middle rod when folded is enhanced; through the limiting sleeve 8, the connecting rod 4, the arc-shaped protrusion 7 and the arc-shaped groove 12, When the middle rod is extended, the engagement between the block 6 and the slot 11 is released, thereby realizing the function of locking the inner tube 2 to the other end of the connecting rod 4; the overall buckling is firm, which enhances the stability of the inner tube 2 and the outer tube 1 when the middle rod is extended; and since there is no need to damage the strength of the middle rod itself by opening a hole in the inner tube 2 or the outer tube 1, the structural stability of the middle rod itself is further ensured; in addition, since the limiting sleeve 8, the connecting bolt 5, the arc groove 12 and the arc protrusion 7 are all located in the outer tube 1, the safety of the use of the middle rod is further improved.

[0054] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A middle rod for a multi-fold umbrella, comprising an outer tube, an inner tube and an upper nest axially fixedly connected to one end of the outer tube, characterized in that: The lockhole that is formed on the one hand is a hole, and the lockhole that is formed on the upper part of the hinge part is formed on the upper part of the chest, and the chest that is formed on the upper part of the chest is fixed with the lockhole that is formed on the chest of the user. The top of the upper nest is provided with a through hole for the connecting bolt, the block and the connecting rod to pass through, the end of the upper nest close to the inner tube is connected to an annular stopper for the limiting cap to be placed, the inner side of the annular stopper is provided with an internal threaded hole, and the outer peripheral surface of the connecting bolt is provided with an external threaded hole connected to the internal threaded hole; Alternatively, a sliding groove is provided at the top of the upper nest for the limit cap to slide back and forth, and a sliding hole is provided at the bottom of the sliding groove for the connecting bolt, the block and the connecting rod to pass through, and a limit block with a T-shaped cross-section is threadedly connected to the notch of the sliding groove, and the limit cap is abutted against the bottom of the sliding groove through the vertical end of the limit block.

2. The middle rod of a multi-fold umbrella according to claim 1, characterized in that: A sealing gasket is sleeved between the horizontal end of the limit stopper and the upper nest.

3. The middle rod of a multi-fold umbrella according to claim 1, characterized in that: The notch of the limiting groove is provided with a guide groove which gradually expands toward the direction approaching the upper nest, and the outer peripheral surface of the limiting sleeve is provided with a notch.

4. The middle rod of a multi-fold umbrella according to claim 1, characterized in that: The cross section of the connecting rod is in the shape of a rounded rectangle, and the cross sections of the limiting groove and the limiting hole are in the shape of a rounded rectangle.

5. The middle rod of a multi-fold umbrella according to claim 1, characterized in that: An anti-scratch cover is arranged between the end of the outer tube away from the upper nest and the inner tube. The anti-scratch cover is connected to the outer tube and is provided with a guide portion extending toward the upper nest.

6. The middle rod of a multi-fold umbrella according to claim 1, characterized in that: One side surface of the clamping block is arranged in an arc shape.

7. The middle rod of a multi-fold umbrella according to claim 1, characterized in that: The limiting sleeve and the inner tube are integrally formed.

Images