Lifting Device

Abstract

The invention relates to a lifting device using fluid as a damping medium to form a driving force. It has an outer tube, an inner tube, a guiding assembly and a spring using fluid as a damping medium to achieve a lifting effect, one end of the inner tube being inserted in the outer tube from one end of the outer tube and being fixedly connected with the guiding assembly, a portion of the guiding assembly being in contact with the inner wall surface of the outer tube to implement rolling friction or sliding friction, one end of the spring being positioned in the outer tube, the other end of the spring penetrating through the inner tube and being connected with the inner tube

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese Patent Application No. 201721919596.0, with a filing date of Dec. 29, 2017. The content of the aforementioned application, including any intervening amendments thereto, is incorporated herein by reference.

TECHNICAL FIELD

The invention relates to a lifting device using fluid as a damping medium to form a driving force.

BACKGROUND ART

A table which serves as an article for daily life is common in life, work and school learning. Along with improvement of living quality of people, requirements for functions of the table are more and more, for example, a requirement for the lifting function of the table is one of the requirements.

At present, lifting of most of tables is realized by gas spring mechanisms mounted on table legs, for example, an invention patent with the publication number being CN106308039A discloses a lifting device, and the lifting device comprises a spring which provides a holding force after lifting and uses fluid as a damping medium, a first sleeve and a second sleeve; one end of the spring is positioned in the first sleeve and is fixedly connected with one end of the first sleeve; one end of the second sleeve is inserted in the first sleeve from the other end of the first sleeve, the other end of the spring penetrates through the second sleeve, the spring and the second sleeve are fixedly connected, and a guiding assembly used for the second sleeve to lift is arranged on the first sleeve and/or the second sleeve; and the guiding assembly is a rolling friction assembly or a sliding friction assembly.

In the above lifting device, although the rolling friction assembly has a guiding effect on the second sleeve, the first sleeve is generally filled with lubricating oil to ensure the service life of the rolling friction assembly, and by the lubricating effect of the lubricating oil, a friction force between the rolling friction assembly and the first sleeve is reduced. However, for the lifting device, in a rising process of the second sleeve, the lubricating oil on the surface of the second sleeve is exposed on the outside of the first sleeve along with rising of the second sleeve, the guiding assembly mounted at an end of the first sleeve is the rolling friction assembly or the sliding friction assembly, and therefore, no components can stop exposure of the lubricating oil. After the second sleeve rises and is positioned, the lubricating oil on the surface of the second sleeve is exposed in air, in a using process of the lifting device, a user easily touches the lubricating oil, the lubricating oil which is exposed in the air is easily oxidized and becomes dry due to loss of water under flowing of the air, and thus, the lubricating effect is lost.

SUMMARY OF THE INVENTION

The invention aims to provide a lifting device, and in the invention, lubricating oil which is attached to an inner tube can be scraped back into an outer tube when the inner tube lifts.

The technical solution for solving the technical problem is as follows:

The lifting device comprises an outer tube, an inner tube, a guiding assembly and a spring using fluid as a damping medium to achieve a lifting effect, one end of the inner tube is inserted in the outer tube from one end of the outer tube and is fixedly connected with the guiding assembly, a portion of the guiding assembly is in contact with the inner wall surface of the outer tube to implement rolling friction or sliding friction, one end of the spring is positioned in the outer tube, the other end of the spring penetrates through the inner tube and is connected with the inner tube, the end, which allows the inner tube to be inserted, of the outer tube is connected with an oil scraping mechanism, and the inner tube penetrates through the oil scraping mechanism and is in clearance fit with the oil scraping mechanism.

Further, the guiding assembly comprises a chock plug with one end inserted in the inner tube, the chock plug comprises an inner sleeve, an outer assembling tube, a connecting block and rolling elements, one end of the connecting block is connected to the outer peripheral surface of the inner sleeve, the other end of the connecting block is connected to the inner peripheral surface of the outer assembling tube, a groove is formed in the outer peripheral surface of the outer assembling tube, through holes are formed in the peripheral surface of the inner tube, one portion of each rolling element is positioned in the groove of the outer assembling tube, and the other portion of each rolling element penetrates through the corresponding through hole of the inner tube and then is in contact with the inner surface of the outer tube.

Further, the oil scraping mechanism comprises a rubber ring.

Further, one end of the rubber ring is bent towards the inside of the rubber ring to form a first bent portion, and the other end of the rubber ring is bent towards the inside of the rubber ring to form a second bent portion. Further, the oil scraping mechanism further comprises a connecting tube, one end of the connecting tube is fixedly connected with one end of the inner tube, and the other end of the connecting tube is connected with the rubber ring.

Further, an annular groove is formed in the inner peripheral surface of the connecting tube, a first protrusion portion which extends in the radial direction of the rubber ring is arranged on the outer peripheral surface of the rubber ring, and the first protrusion portion is embedded in the annular groove.

Further, a second protrusion portion is also arranged on the outer peripheral surface of the rubber ring, and after the first protrusion portion is embedded in the annular groove, the first protrusion portion is abutted against the inner peripheral surface of the connecting tube.

After the lifting device of the present utility model is provided with the oil scraping mechanism and the inner tube penetrates through the oil scraping mechanism and is in clearance fit with the oil scraping mechanism, the oil scraping mechanism scraps most of the lubricating oil on the surface of the inner tube back into the outer tube when the inner tube lifts, thus, the lubricating oil which is brought out to the outside of the outer tube by the inner tube can be greatly reduced, and the lubricating property of the lubricating oil can be maintained.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of an external structure of a lifting device of the present utility model;

FIG. 2 is a schematic sectional view of the lifting device of the present utility model;

FIG. 3 is schematic assembled view of a guiding assembly and an inner tube in the present utility model;

FIG. 4 is a perspective schematic view of a rubber ring in the present utility model;

FIG. 5 is a schematic sectional view of the rubber ring in the present utility model;

FIG. 6 is a perspective schematic view of a connecting tube in the present utility model; and

FIG. 7 is a schematic sectional view of the connecting tube in the present utility model.

DETAILED DESCRIPTION OF THE UTILITY MODEL

As shown in FIG. 1 and FIG. 2, a lifting device of the present utility model comprises an outer tube 1, an inner tube 2, a guiding assembly, an oil scraping mechanism and a spring 3 using fluid as a damping medium to achieve a lifting effect, and their structures and the relationship between the structures will be described in detail:

As shown in FIG. 1 to FIG. 3, one end of the inner tube 2 is inserted in the outer tube 1 from one end of the outer tube 1 and is fixedly connected with the guiding assembly, a portion of the guiding assembly is in contact with the inner wall surface of the outer tube to implement rolling friction or sliding friction, the guiding assembly comprises a chock plug with one end inserted in the inner tube, the chock plug comprises an inner sleeve 4, an outer assembling tube 5, a connecting block 6 and rolling elements 7, one end of the connecting block 6 is connected to the outer peripheral surface of the inner sleeve 4, the other end of the connecting block 6 is connected to the inner peripheral surface of the outer assembling tube 5, a groove is formed in the outer peripheral surface of the outer assembling tube 5, through holes are formed in the peripheral surface of the inner tube 2, one portion of each rolling element 7 is positioned in the groove of the outer assembling tube 5, the other portion of each rolling element 7 penetrates through the corresponding through hole of the inner tube 2 and then is in contact with the inner surface of the outer tube 1, and thus, each rolling element 7 is in contact with the inner wall surface of the outer tube 1 to implement rolling friction. The rolling elements 7 can be spherical rolling elements or columnar rolling elements.

As shown in FIG. 1 and FIG. 2, the spring 3 is a gas spring, one end of the spring 3 is positioned in the outer tube 1, the other end of the spring 3 penetrates through the inner tube 2 and is connected with the inner tube 2, and thus, the inner tube 2 is driven to lift when the spring 3 lifts. The spring 3 penetrates through the inner sleeve 4 and then penetrates through the inner tube 2, and the spring 3 and the inner tube 2 can be directly connected (such as welding or threaded connection or hinging), and can also be connected by an added connector (not shown in the figures).

As shown in FIG. 1 to FIG. 7, the end, which allows the inner tube 2 to be inserted, of the outer tube 1 is connected with the oil scraping mechanism, and the inner tube 2 penetrates through the oil scraping mechanism and is in clearance fit with the oil scraping mechanism. When the inner tube 2 lifts, most of lubricating oil attached to the surface of the inner tube 2 is scraped back into the outer tube by the oil scraping mechanism, thus, the lubricating oil which is brought out to the outside of the outer tube 1 by the inner tube 2 can be greatly reduced, and the lubricating property of the lubricating oil can be maintained. Meanwhile, the oil scraping mechanism has a guiding effect on the inner tube 2, and because the two ends of the inner tube 2 are guided, the inner tube 2 can be more stable in a lifting process.

As shown in FIG. 1 to FIG. 7, the oil scraping mechanism comprises a rubber ring 9, one end of the rubber ring 9 is bent towards the inside of the rubber ring 9 to form a first bent portion 9a, the other end of the rubber ring 9 is bent towards the inside of the rubber ring 9 to form a second bent portion 9b, by the first bent portion 9a and the second bent portion 9b, the lubricating oil attached to the surface of the inner tube 2 can be scraped back into the outer tube 1 regardless of rising and falling of the inner tube 2, and therefore, the efficiency of scraping the lubricating oil back into the outer tube is further improved after the first bent portion 9a and the second bent portion 9b are arranged.

As shown in FIG. 1 to FIG. 7, the oil scraping mechanism further comprises a connecting tube 10, one end of the connecting tube 10 is fixedly connected with one end of the inner tube 2, and the other end of the connecting tube is connected with the rubber ring 9. In one or more embodiments, preferably, inner threads are arranged at the end, which is connected with the inner tube 2, of the connecting tube 10, the inner tube 2 is provided with outer threads, and therefore, the connecting tube 10 is in threaded connection with the inner tube 2. According to a mode of connecting the connecting tube 10 with the rubber ring 9, an annular groove 10a is formed in the inner peripheral surface of the connecting tube 10, a first protrusion portion 9c which extends in the radial direction of the rubber ring 9 is arranged on the outer peripheral surface of the rubber ring 9, the first protrusion portion 9c is embedded in the annular groove 10a, and thus, the rubber ring 9 and the connecting tube 10 are connected to form a whole body. The connecting mode is simple and reliable, and the first protrusion portion 9c can be rapidly embedded in the annular groove 10a by the elastic effect of the rubber ring favorably.

As shown in FIG. 1 to FIG. 7, a second protrusion portion 9d is further arranged on the outer peripheral surface of the rubber ring 9, and after the first protrusion portion 9c is embedded in the annular groove 10a, the second protrusion portion 9d is abutted against the inner peripheral surface of the connecting tube 10. After the rubber ring 9 is in clearance fit with the inner tube 2, the rubber ring 9 is extruded by the inner tube 2 to move towards the inner wall of the connecting tube 10, the second protrusion portion 9d is abutted against the inner peripheral surface of the connecting tube 10, thus, the area of the portion, which is in contact with the connecting tube 10, of the rubber ring 9 is increased, and the rubber ring 9 and the connecting tube are combined more firmly.

Claims

1. A lifting device, comprising an outer tube, an inner tube, a guiding assembly and a spring using fluid as a damping medium to achieve a lifting effect, one end of the inner tube being inserted in the outer tube from one end of the outer tube and being fixedly connected with the guiding assembly, a portion of the guiding assembly being in contact with the inner wall surface of the outer tube to implement rolling friction or sliding friction, one end of the spring being positioned in the outer tube, the other end of the spring penetrating through the inner tube and being connected with the inner tube, characterized in that the end, which allows the inner tube to be inserted, of the outer tube is connected with an oil scraping mechanism, and the inner tube penetrates through the oil scraping mechanism and is in clearance fit with the oil scraping mechanism.

2. The lifting device according to claim 1, characterized in that the guiding assembly comprises a choke plug with one end inserted in the inner tube, the choke plug comprises an inner sleeve, an outer assembling tube, a connecting block and rolling elements, one end of the connecting block is connected to the outer peripheral surface of the inner sleeve, the other end of the connecting block is connected with the inner peripheral surface of the outer assembling tube, a groove is formed in the outer peripheral surface of the outer assembling tube, through holes are formed in the peripheral surface of the inner tube, one portion of each rolling element is positioned in the groove of the outer assembling tube, the other portion of each rolling element penetrates through the corresponding through hole of the inner tube and then is in contact with the inner surface of the outer tube.

3. The lifting device according to claim 1, characterized in that the oil scraping mechanism comprises a rubber ring.

4. The lifting device according to claim 3, characterized in that one end of the rubber ring is bent towards the inside of the rubber ring to form a first bent portion, and the other end of the rubber ring is bent towards the inside of the rubber ring to form a second bent portion.

5. The lifting device according to claim 3, characterized in that the oil scraping mechanism further comprises a connecting tube, one end of the connecting tube is fixedly connected with one end of the inner tube, and the other end of the connecting tube is connected with the rubber ring.

6. The lifting device according to claim 5, characterized in that an annular groove is formed in the inner peripheral surface of the connecting tube, a first protrusion portion which extends in the radial direction of the rubber ring is arranged on the outer peripheral surface of the rubber ring, and the first protrusion portion is embedded in the annular groove.

7. The lifting device according to claim 6, characterized in that a second protrusion portion is further arranged on the outer peripheral surface of the rubber ring, and after the first protrusion portion is embedded in the annular groove, the second protrusion portion is abutted against the inner peripheral surface of the connecting tube.