CN205654671U - Telescopic tube - Google Patents

Abstract

The utility model discloses a telescopic pipe, which comprises an outer pipe, an inner pipe, a locking ring with elasticity and a locking device, the inner pipe sleeve is arranged in the outer pipe, the locking ring is arranged between the inner pipe and the outer pipe, the end part of the locking ring is provided with a limit part which is abutted against the bottom end of the outer pipe, the locking device is sleeved on the outer pipe and consists of an outer nut and an inner nut, the inner nut is fixed on the outer pipe, the outer nut is matched with the inner nut, the tail part of the outer nut is provided with a locking part which faces the bottom surface of the limit part, the telescopic pipe of the utility model can be sleeved in the outer pipe by utilizing the stress deformation of the notch through arranging at least two notches which do not completely penetrate through the side wall, thereby retaining the advantages of cost and installation efficiency of the plastic inner sleeve, preventing pollutants such as dust and the like from entering the locking device along the gap due to the incompletely penetrated gap, the locking process can not deviate, and the stability and the service life of the internal structure are effectively guaranteed.

Description

a stretch tube

technical field

The utility model relates to a support mechanism, in particular to a telescopic tube.

Background technique

The telescopic tube is a relatively common mechanical support mechanism, which can be seen in many fields, such as the main rod and foot tube of the camera stand. The telescopic tube is generally composed of an outer tube, an inner tube, a locking ring and a locking device. The inner tube is sleeved inside the outer tube and a locking ring is formed between the inner and outer tubes. The end of the locking ring has a limit portion against the outer At the bottom of the tube, the locking device is set on the outer tube and consists of an outer nut and an inner screw sleeve. The inner screw sleeve is fixed on the outer tube. The outer nut is adapted to the inner screw sleeve and has a locking part at the end of the outer nut. Through the outer nut When the inner threaded sleeve is screwed forward, the locking part gradually squeezes the limiting part of the locking ring. The contact surface between the limiting part and the locking part is an inclined surface. During the extrusion process, a radial gap is generated between the inner and outer tubes. Tension, so that the inner and outer tubes are locked.

There are generally two ways to fix the inner threaded sleeve on the outer tube: one is to fix the metal inner threaded sleeve by gluing, which has high material costs, long process and low production efficiency; the other is to use plastic inner The inner wall of the screw sleeve is provided with a protrusion to fasten with the through hole on the outer tube. In order to facilitate installation, a gap must be drawn in the axial direction of the plastic inner screw sleeve. In this way, the internal screw sleeve is not beautiful enough, and the gap is also easy to allow dust and other pollutants to enter the locking device, and it is also easy to deviate during the locking process, which affects the internal structure. Stability and service life.

Utility model content

In order to solve the above technical problems, the purpose of this utility model is to provide a telescopic tube with low cost, beautiful appearance and stable structure.

The technical scheme that the utility model adopts is:

A telescopic tube includes an outer tube, an inner tube, an elastic locking ring and a locking device. Leaning against the bottom of the outer tube, the locking device is sleeved on the outer tube and consists of an outer nut and an inner screw sleeve, the inner screw sleeve is fixed on the outer tube, the outer nut is adapted to the inner screw sleeve and the tail of the outer nut has a bottom surface facing the limit part The locking part of the locking part, the butt joint surface between the limiting part and the locking part is a slope, the inner threaded sleeve is a plastic inner threaded sleeve, the inner wall of the plastic inner threaded sleeve is provided with at least two protrusions, and the outer tube is provided with There are through holes matched with the protrusions for fixing the plastic inner screw sleeve on the outer tube, and the plastic inner screw sleeve is provided with at least two notches that do not completely penetrate the side wall of the inner screw sleeve.

Further, the protrusion and the through hole are gradually indented structures with a wide top and a narrow bottom.

Wherein, the gradual indentation structure is an inverted cone-shaped structure, an inverted trapezoidal structure or an inverted arc-shaped structure.

Preferably, the protrusions are evenly spaced apart.

Preferably, the gaps are evenly spaced.

Further optimization, the outer surface of the outer nut is covered with a finger sleeve with the same size as the outer surface, and the outer surface of the finger sleeve has a rough surface that increases the coefficient of friction.

The beneficial effects of the utility model:

The telescopic tube of the utility model is provided with at least two gaps that do not completely penetrate the side wall of the inner screw sleeve through the inner screw sleeve, and can be inserted into the outer tube by using the gaps to be deformed by force, thereby retaining the cost and cost of the plastic inner sleeve. The installation efficiency is superior, and at the same time, the incompletely penetrated gap can prevent dust and other pollutants from entering the locking device along the gap, and it will not deviate during the locking process, effectively ensuring the stability and service life of the internal structure.

Description of drawings

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described further.

Fig. 1 is a perspective view of the utility model telescopic tube;

Fig. 2 is a partial sectional view of the telescopic tube of the present invention;

Fig. 3 is an exploded view of the utility model telescopic tube;

Fig. 4 is a three-dimensional enlarged view of the inner threaded sleeve;

Fig. 5 is a three-dimensional enlarged view of the outer nut;

Fig. 6 is a three-dimensional enlarged view of the locking ring.

detailed description

As shown in FIGS. 1-3 , it is a telescopic tube of the present invention, including an outer tube 10 , an inner tube 20 , an elastic locking ring 30 and locking devices and other main components.

The specific connection relationship is as follows: as shown in Figure 2, the inner tube 20 is sleeved in the outer tube 10, the locking ring 30 is arranged between the inner and outer tubes 10 and its end has a limiting part 301 against the bottom of the outer tube 10 ( See FIG. 6 ), and the limiting portion 301 engages with the bottom end of the outer tube 10 with an inclined plane, so as to make the connection more tightly and positioned. The locking device is sleeved on the outer tube 10 and consists of an outer nut 40 and an inner screw sleeve 50, the inner screw sleeve 50 is fixed on the outer tube 10, the outer nut 40 is adapted to the inner screw sleeve 50 and the tail of the outer nut 40 has a direction limit The locking part 401 on the bottom surface of the part 301 (see FIG. 5 ), the butt joint surface between the limiting part 301 and the locking part 401 is an inclined plane.

The action relationship between the above components is as follows: through the outer nut 40 forwardly screwing in toward the inner threaded sleeve 50, the locking part 401 gradually squeezes the limit part 301 of the locking ring 30, and the inner and outer tubes 10 are free during the extrusion process. Radial tension is generated, thereby locking the inner and outer tubes 10 .

In order to retain the cost and installation efficiency advantages of the plastic inner sleeve, the incompletely penetrated gap 501 can also prevent dust and other pollutants from entering the interior of the locking device along the gap 501, and it will not deviate during the locking process, effectively ensuring The stability and service life of the internal structure. The main improvement made by this technical solution is: as shown in Figure 4, the plastic inner threaded sleeve 50 is provided with two notches 501 that do not completely penetrate the side wall of the inner threaded sleeve 50, and the notches 501 can be deformed by force and inserted into the outer tube 10. After that, the two protrusions 502 provided on the inner wall of the plastic inner threaded sleeve 50 can be snapped together with the through holes 101 provided on the outer tube 10 that match the protrusions 502, thereby realizing the fixing of the plastic inner threaded sleeve 50 on the outer tube 10.

In addition, as an optimized design of this technical solution, the outer surface of the outer nut 40 is covered with a finger sleeve 60 of the same size, as shown in Figures 1 and 3, the outer surface of the finger sleeve 60 has a rough surface that increases the coefficient of friction. Therefore, it is convenient to apply torque better when rotating the outer nut 40 .

It needs to be added that the number of protrusions 502, through holes 101 and notches 501 is not limited to two, but as a preferred number, other numbers greater than two are also suitable for this technical solution, and the protrusions 502 are evenly spaced Distribution, evenly spaced distribution among the gaps 501, etc. are also preferred designs.

As another improvement of this technical solution, the protrusion 502 and the through hole are a gradual indentation structure with a wide top and a narrow bottom. Referring to Figure 3 and Figure 4, when the outer nut 40 is screwed forward toward the inner threaded sleeve 50, The protrusion 502 has a tendency to follow the displacement of the inner threaded sleeve 50 toward the outer nut 40 , so as to fit more closely with the through hole. Wherein, the gradual indentation structure includes but is not limited to an inverted tapered structure, an inverted trapezoidal structure or an inverted arc-shaped structure, and other conventional improvement ideas based on this are also applicable to this technical solution.

The above is only the preferred implementation of the utility model, the utility model is not limited to the above implementation, as long as the technical solutions to achieve the purpose of the utility model by basically the same means are within the scope of protection of the utility model.

Claims (6)

1. A telescopic tube, comprising an outer tube, an inner tube, an elastic locking ring and a locking device, the inner tube is sleeved in the outer tube, the locking ring is arranged between the inner and outer tubes and its end has a limit The upper part rests against the bottom of the outer tube, the locking device is sleeved on the outer tube and consists of an outer nut and an inner screw sleeve, the inner screw sleeve is fixed on the outer tube, the outer nut is adapted to the inner screw sleeve and the tail of the outer nut has a direction limit The locking part on the bottom surface of the part, the butt joint surface between the limiting part and the locking part is a slope, and it is characterized in that: the inner screw sleeve is a plastic inner screw sleeve, and the inner wall of the plastic inner screw sleeve is provided with at least two protrusions. From the beginning, the outer tube is provided with a through hole matching the protrusion for the plastic inner screw sleeve to be fixed on the outer tube, and the plastic inner screw sleeve is provided with at least two notches that do not completely penetrate the side wall of the inner screw sleeve. 2. A kind of telescopic tube according to claim 1, characterized in that: the protrusion and the through hole are a gradual indentation structure with a wide top and a narrow bottom. 3. A telescoping tube according to claim 2, characterized in that: the gradual indentation structure is an inverted tapered structure, an inverted trapezoidal structure or an inverted arc-shaped structure. 4. A kind of telescopic tube according to claim 1, characterized in that: uniformly spaced distribution between the protrusions. 5. A kind of telescopic tube according to claim 1, is characterized in that: evenly spaced distribution between described breach. 6. A kind of telescopic tube according to claim 1, characterized in that: the outer surface of the outer nut is covered with a finger cover consistent with its size, and the outer surface of the finger cover has a rough surface that increases the coefficient of friction.