Patent No.:CN214742960U Date:2021-04-25

Google Patent: https://patents.google.com/patent/CN214742960U/en?oq=CN214742960U

China Patent: http://epub.cnipa.gov.cn/

A Chronic Obstructive Pulmonary Stop Gas Spring
Abstract
This utility model provides a chronic obstructive pulmonary stop gas spring. The gas spring includes a closed cavity, a piston assembly arranged within the closed cavity, and a stop member. The piston assembly comprises a piston body and a piston rod, and the stop member is sleeved on the piston rod. The stop member includes an integrally connected shaft shoulder and a stop part, and the stop part is provided with a stop protrusion at one end away from the shaft shoulder. Through the stiction friction surfaces and frictional force between the stop member of the gas spring and the closed cavity or the piston rod, deceleration and stopping are achieved without the need for any power source. It has the advantages of simple structure, ingenious design concept, low processing difficulty of components, and meets many applications in various fields.

Description
A Chronic Obstructive Pulmonary Stop gas spring
Technical Field
This utility model relates to the field of gas springs, and specifically to a chronic obstructive pulmonary stop gas spring.
Background
A gas spring is a component that can realize functions such as support, buffering, braking, height and angle adjustment. In construction machinery, it is mainly used in parts such as covers and doors. A gas spring mainly consists of a piston rod, a piston, a sealing guide sleeve, a filler, a pressure cylinder, and joints. Among them, the pressure cylinder is a closed cavity filled with an inert gas or an oil-gas mixture, and the pressure inside the cavity is several times or dozens of times the atmospheric pressure.
When some gas springs are used in specific applications, they are required to have a stop performance when fully extended or fully compressed. The so-called stop means that they stop at the end position of the extension and compression stroke and cannot move, and they can only be displaced by applying a specified large external force, and this stop is not locking, and there is no need to set a locking gas spring. Currently, the stop members used on the market have the disadvantages of complex composition and structure, high processing difficulty, and limited application fields.
Therefore, there is an urgent need to design a stop gas spring with a simple structure, low component processing difficulty, and capable of meeting applications in multiple fields.
Utility Model Content
In view of this, this utility model provides a chronic obstructive pulmonary stop gas spring that realizes without any power source, only by using the stiction friction surfaces and frictional force between components, and has the advantages of simple structure, low component processing difficulty, and being able to meet applications in multiple fields.
To achieve the above purpose, this utility model provides the following technical solution: A chronic obstructive pulmonary stop gas spring includes a closed cavity, a piston assembly arranged in the closed cavity, and a stop member. The piston assembly includes a piston body and a piston rod, the stop member is sleeved on the piston rod, the stop member includes an integrally connected shaft shoulder and a stop part, a stop protrusion is provided on one end of the stop part away from the shaft shoulder, and an inner protrusion is provided on the inner wall of the closed cavity 1.

This passage describes a patent for a gas spring called a “chronic obstructive pulmonary stop gas spring .” It first explains the technical field, which is related to gas springs. Then it details the background of gas springs, including their components and typical applications in construction machinery. It further points out the need for stop performance in some gas spring applications, which means the spring should stop at the end of its extension or compression stroke and require a certain external force to move from that position without being locked. It mentions the drawbacks of existing stop members on the market, such as complex structures and high processing difficulty. The gas spring proposed by the utility model aims to address these issues by using simple components and relying on friction and stiction between parts to achieve the stopping function. The gas spring consists of a closed cavity, a piston assembly (with a piston body and piston rod), and a stop member. The stop member has an integrated shaft shoulder and stop part, with a stop protrusion at one end of the stop part. Additionally, there is an inner protrusion on the inner wall of the closed cavity. These features are designed to work together to achieve the desired stopping functionality without the need for external power sources and with the benefits of simplicity and wide applicability.

In one preferred embodiment, the stop member is provided with a first through opening and a second through opening along its axial direction, and the first through opening and the second through opening are arranged symmetrically.
In one preferred embodiment, the stop protrusion is a curved protrusion along the outer periphery of the stop part.
In one preferred embodiment, the inner wall of the closed cavity is provided with a first inner protrusion, a second inner protrusion, and a third inner protrusion, and a curved groove adapted to the curved protrusion is formed between the second inner protrusion and the third inner protrusion.
In one preferred embodiment, a circular hole adapted to the shaft diameter of the connecting end of the piston rod is opened in the middle of the shaft shoulder.
In one preferred embodiment, an annular groove is provided on the side surface of the shaft shoulder.
In one preferred embodiment, an annular protrusion adapted to the annular groove is provided on the inner wall of the closed cavity.
In one preferred embodiment, the stop protrusion is a double conical inner protrusion along the inner periphery of the stop part.
In one preferred embodiment, a first annular groove and a second annular groove are opened at one end of the piston rod near the piston body, and a first elastic retaining ring and a second elastic retaining ring are placed in the first annular groove and the second annular groove respectively.
In one preferred embodiment, the cross-sectional shapes of the first elastic retaining ring and the second elastic retaining ring are both elliptical.

Features and Advantages of the Utility Model:
On one hand, the utility model makes the stop member move with the movement of the piston assembly by abutting the shaft shoulder of the stop member on the piston body and fixedly connecting it with the piston rod. When the piston assembly moves, the stop protrusion undergoes two brief decelerations when passing through the first inner protrusion and the second inner protrusion on the inner wall of the closed cavity, and finally moves to the end of the stroke, so that the stop protrusion stops in the annular groove of the closed cavity and remains stationary. On the other hand, the annular protrusion in the closed cavity is fixedly clamped in the annular groove on the shaft shoulder of the stop member, making the stop member stationary. When the piston assembly moves, the first elastic retaining ring and the second elastic retaining ring on the piston rod generate two brief decelerations when they come into contact with the stop protrusion, and finally move to the end of the stroke, so that the stop protrusion stops and remains stationary between the piston body and the first elastic retaining ring. Therefore, the utility model realizes deceleration and stopping through the stiction friction surfaces and frictional force between the stop member of the gas spring and the closed cavity or the piston rod, without any power source, has a simple structure, low processing difficulty of components, and can meet applications in multiple fields, solving the problems of complex composition and structure, high processing difficulty, and limited application fields of the stop gas spring in the prior art.

This section of the patent further elaborates on several preferred embodiments of the “chronic obstructive pulmonary stop gas spring .” It details various features and configurations of the gas spring :

• Axial Openings in the Stop Member: The stop member has symmetric first and second through openings along its axial direction. These openings might serve different purposes such as facilitating fluid flow, reducing weight, or interacting with other parts of the gas spring in a specific way, but the patent doesn’t specify their exact function here.
• Stop Protrusion Shapes: There are different descriptions of the stop protrusion. It can be a curved protrusion along the outer periphery of the stop part, which could interact with corresponding curved grooves in the closed cavity to achieve stopping. Another option is a double conical inner protrusion along the inner periphery of the stop part, which might interact with other parts in a different manner for the stopping function.
• Inner and Annular Features: The inner wall of the closed cavity has multiple inner protrusions and grooves, and there are corresponding annular grooves and protrusions on the shaft shoulder of the stop member. These are designed to work together for better stopping and positioning. For example, the annular groove on the shaft shoulder and the annular protrusion on the cavity wall can interlock to hold the stop member in place.
• Elastic Retaining Rings: The piston rod near the piston body has first and second annular grooves where elliptical cross-sectioned elastic retaining rings are placed. These rings, when interacting with the stop protrusion, contribute to the stopping mechanism by causing brief decelerations and finally stopping the movement of the gas spring.

Overall, the utility model utilizes these various features and interactions between the stop member, piston assembly, and the closed cavity to achieve deceleration and stopping. The design aims to overcome the issues of complexity and limited applicability found in existing stop gas springs by using simple structures and relying on friction and stiction forces, without needing an external power source. The described mechanisms and interactions provide multiple ways for the gas spring to achieve the desired stopping function at different stages of motion, enhancing its functionality and versatility in different fields of application.

Appendix Description
The following figures are used to provide a further understanding of this application, form a part of this application, and are only intended for schematic explanation and illustration of the utility model, not to limit the scope of the utility model. In the figures:
Figure 1 is a schematic diagram of the assembly structure of a chronic obstructive pulmonary stop gas spring in Example 1 of this application;
Figure 2 is a right side view of the P stop member in Example 1 of this application;
Figure 3 is a cross-sectional view along A – A in Figure 2;
Figure 4 is a schematic diagram of the assembly structure of a chronic obstructive pulmonary stop gas spring in Example 2 of this application;
Figure 5 is a left side view of the P’ stop member in Example 2 of this application;
Figure 6 is a cross-sectional view along B – B in Figure 5.

Reference numerals:

1. Closed cavity; 2. Piston assembly; 3. P stop member; 3′. P’ stop member; 11. First inner protrusion; 12. Second inner protrusion; 13. Third inner protrusion; 21. Piston body; 22. Piston rod; 31. P shaft shoulder; 32. P connection part; 31′. P’ shaft shoulder; 32′. P’ connection part; 310. Annular groove; 311. Circular hole; 312. First through opening; 313. Second through opening; 320. Double conical inner protrusion; 321. Curved protrusion.

Specific Implementation Mode
The following will disclose several implementation modes of this application through diagrams, and clearly and completely describe the technical solution of the utility model. The accompanying drawings of the specification that form a part of this application are used to provide a further understanding of the utility model. The schematic examples and descriptions of the utility model are used to explain the utility model and do not constitute an improper limitation of the utility model. Based on the examples in the utility model, all other examples obtained by ordinary technicians in the field without creative work fall within the protection scope of the utility model.

It should be noted that unless otherwise defined, the directions of up, down, left, right, inner, and outer mentioned in this article are based on the up, down, left, right, inner, and outer directions shown in Figure 1 of this application example. If the specific posture changes, the directional indication will also change accordingly. The meanings of “multiple” and “several” are two or more. Here, it is explained together that the use of “first”, “second”, “third” and similar words does not indicate any order, quantity, or importance, but is only used to distinguish different components. In addition, in various embodiments of the present disclosure, the same or similar reference numerals represent the same or similar components.

This section of the patent provides a detailed description of the figures and reference numerals used to illustrate the “chronic obstructive pulmonary stop gas spring.” Here’s a breakdown of the information:

• Figure Overview:
  • Figure 1 shows the assembly structure of the gas spring in Example 1. It gives an overall view of how the different parts of the gas spring fit together.
  • Figure 2 is the right side view of the P stop member in Example 1, helping to visualize its shape from a particular perspective.
  • Figure 3 is a sectional view along A – A in Figure 2, providing insights into the internal structure of the P stop member.
  • Similar to the above, Figure 4 shows the assembly of the gas spring in Example 2, Figure 5 shows the left side view of the P’ stop member, and Figure 6 is the sectional view of the P’ stop member.
• Reference Numerals:
  • Each part of the gas spring is labeled with a unique reference numeral for easy identification. For example, the closed cavity is labeled as 1, and different parts of the piston assembly and stop member have their own numerals. This makes it easier to discuss and understand specific parts of the gas spring in both the text and the figures.
• Implementation Mode:
  • The specific implementation section aims to clearly and completely describe the technical solution of the utility model using the figures. It emphasizes that the figures are for understanding the utility model and not for limiting it.
  • It also clarifies the meaning of directional terms and the use of words like “first”, “second”, etc., which are used for component distinction rather than indicating importance or order. This ensures that readers can correctly interpret the information provided in the patent and understand how the gas spring works based on the figures and the accompanying text.
  • It further states that the patent’s protection scope includes all other examples that can be obtained by ordinary technicians without creative work, based on the provided examples.

In the present utility model, unless otherwise clearly defined and limited, terms such as “connection” and “fixing” should be understood in a broad sense. For example, “fixing” can be a fixed connection, a detachable connection, or an integral connection, unless otherwise clearly limited. For ordinary technicians in the field, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

In addition, the technical solutions of the various embodiments of the utility model can be combined with each other, but it must be based on what ordinary technicians in the field can achieve. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

Example 1
Please refer to Figures 1 to 3. A chronic obstructive pulmonary stop gas spring in this example includes a closed cavity 1, a piston assembly 2 arranged in the closed cavity, and a P stop member 3. The piston assembly 2 includes a piston body 21 and a piston rod 22, and the P stop member 3 is sleeved on the piston rod 22. The P stop member 3 includes an integrally connected P shaft shoulder 31 and a P stop part 32, and a stop protrusion is provided on the P stop part 32 at one end away from the P shaft shoulder 31. Further, as shown in Figure 3, the stop protrusion in this example is a curved protrusion 321 along the outer periphery of the P stop part 32. Furthermore, the inner wall of the closed cavity 1 is provided with inner protrusions. More specifically, as shown in Figure 1, the inner wall of the closed cavity 1 in this example is provided with a first inner protrusion 11, a second inner protrusion 12, and a third inner protrusion 13, and a curved groove adapted to the curved protrusion 321 is formed between the second inner protrusion 12 and the third inner protrusion 13.

It should be noted that by abutting the P shaft shoulder 31 of the P stop member 3 on the piston body 21 and fixedly connecting it with the piston rod 22, the P stop member 3 moves with the movement of the piston assembly. When the piston assembly 2 performs an extension movement, the curved protrusion 321 passes through the first inner protrusion 11 and the second inner protrusion 12 on the inner wall of the closed cavity 1 in sequence, resulting in two brief decelerations, and finally moves to the end of the stroke, so that the curved protrusion 321 stops in the annular groove of the closed cavity 1 and remains stationary, thereby realizing the stop function of the extension movement. When performing a compression movement, a certain external force needs to be applied to shift it.

As shown in Figures 2 and 3, as a specific implementation, the P stop member 3 in this example is provided with a first through opening 312 and a second through opening 313 along its axial direction, and the first through opening 312 and the second through opening 313 are symmetrically arranged. More specifically, a circular hole 311 adapted to the shaft diameter of the connecting end of the piston rod 22 is opened in the middle of the P shaft shoulder 31 in this example.

It should be noted that the P stop part 32 of the P stop member 3 in this example is composed of two symmetrical three-dimensional elastic semicircular sectors, and a curved protrusion 321 is provided on the outer diameter edge of each three-dimensional elastic semicircular sector at one end away from the P shaft shoulder 31. Among them, the width and thickness of the three-dimensional elastic semicircular sector are determined according to the actual designed stopping force. Similarly, the protrusion height and width of the curved protrusion and the inner protrusion of the closed cavity are also selected and determined according to the actual designed stopping force.

This section describes the first implementation example of the chronic obstructive pulmonary stop gas spring in detail:

• gas spring Components and Structure:
  • The gas spring consists of a closed cavity 1, a piston assembly 2, and a P stop member 3. The piston assembly has a piston body 21 and a piston rod 22, and the P stop member is sleeved on the piston rod. The P stop member has a P shaft shoulder 31 and a P stop part 32.
  • The P stop part 32 has a curved protrusion 321 at one end away from the P shaft shoulder.
  • The closed cavity 1 has inner protrusions, specifically, first, second, and third inner protrusions 11, 12, and 13. A curved groove is formed between the second and third inner protrusions to fit the curved protrusion of the P stop part.
• Movement and Functionality:
  • The P stop member 3 moves with the piston assembly through the connection between the P shaft shoulder 31 and the piston body 21 and piston rod 22.
  • During the extension movement of the piston assembly 2, the curved protrusion 321 passes through the first and second inner protrusions, causing two decelerations, and finally stops in the annular groove of the closed cavity 1, achieving the stop function for extension. However, for compression movement, an external force is required to move it.
• Additional Features:
  • The P stop member 3 has symmetric first and second through openings 312 and 313 along its axial direction.
  • The P shaft shoulder 31 has a circular hole 311 in the middle that fits the shaft diameter of the piston rod 22.
  • The P stop part 32 is made of two symmetrical three-dimensional elastic semicircular sectors, and the size and shape of these sectors, as well as the curved protrusion, are determined based on the designed stopping force, indicating that the design takes into account the required force for stopping in practical applications. This allows for customization of the device’s performance according to different requirements.

Example 2
As shown in Figures 4 to 6, a chronic obstructive pulmonary stop gas spring in this example includes a closed cavity 1, a piston assembly 2 arranged in the closed cavity 1, and a P’ stop member 3′. The piston assembly 2 includes a piston body 21 and a piston rod 22, and the P’ stop member 3′ is sleeved on the piston rod 22. The P’ stop member 3′ includes an integrally connected P’ shaft shoulder 31′ and a P’ stop part 32′, and a stop protrusion is provided on the P’ stop part 32′ at one end away from the P’ shaft shoulder 31′. As shown in Figure 6, further, the stop protrusion in this example is a double conical inner protrusion 320 along the inner periphery of the P’ stop part 32′.

It should be noted that, as shown in Figure 6, the so-called double conical inner protrusion 320 includes an inner conical surface on the left side and a P’ curved protrusion on the right side, and the taper of the inner conical surface is preferably between 20 degrees and 60 degrees, more preferably 42 degrees, and the selection of the angle and height is designed according to the actually required stopping force. Both the P’ stop member 3′ and the P stop member 3 are molded hard plastic parts.

As shown in Figure 6, as a specific implementation, an annular groove 310 is provided on the side surface of the P’ shaft shoulder 31′ in this example. In combination with Figure 4, further, an annular protrusion 15 adapted to the annular groove 310 is provided on the inner wall of the closed cavity 1 in this example.

As shown in Figure 4, as a specific implementation, a first annular groove and a second annular groove are opened at one end of the piston rod 22 near the piston body 21 in this example, and a first elastic retaining ring 41 and a second elastic retaining ring 42 are placed in the first annular groove and the second annular groove respectively. More specifically, the cross-sectional shapes of the first elastic retaining ring 41 and the second elastic retaining ring 42 in this example are both elliptical.

In conclusion, on the one hand, the present application makes the stop member move with the movement of the piston assembly by abutting the shaft shoulder of the stop member on the piston body and fixedly connecting it with the piston rod. When the piston assembly moves, the stop protrusion undergoes two brief decelerations when passing through the first inner protrusion and the second inner protrusion on the inner wall of the closed cavity, and finally moves to the end of the stroke, so that the stop protrusion stops in the annular groove of the closed cavity and remains stationary. On the other hand, the annular protrusion in the closed cavity is fixedly clamped in the annular groove on the shaft shoulder of the stop member, making the stop member stationary. When the piston assembly moves, the first elastic retaining ring and the second elastic retaining ring on the piston rod generate two brief decelerations when they come into contact with the stop protrusion, and finally move to the end of the stroke, so that the stop protrusion stops and remains stationary between the piston body and the first elastic retaining ring. Therefore, the utility model realizes deceleration and stopping through the stiction friction surfaces and frictional force between the stop member of the gas spring and the closed cavity or the piston rod, without any power source, has a simple structure, low processing difficulty of components, ingenious design concept, and can meet applications in multiple fields, solving the problems of complex composition and structure, high processing difficulty, and limited application fields of the stop gas spring in the prior art.

The above description shows and describes the preferred implementation mode of the present application. However, as mentioned earlier, it should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other implementation modes, but can be used in various other combinations, modifications, and environments, and can be modified through the above teachings or technologies or knowledge in related fields within the scope of the concept of the present application. And any changes and variations made by those skilled in the art without departing from the spirit and scope of the present application shall fall within the protection scope of the appended claims of the present application.

This part of the patent describes the second implementation example of the chronic obstructive pulmonary stop gas spring :

• gas spring Components and Structure:
  • Similar to Example 1, this gas spring also consists of a closed cavity 1, a piston assembly 2, and a P’ stop member 3′. The P’ stop member has a P’ shaft shoulder 31′ and a P’ stop part 32′, and the P’ stop part has a stop protrusion.
  • The stop protrusion in this example is a double conical inner protrusion 320 with an inner conical surface and a P’ curved protrusion, and the taper of the inner conical surface can be adjusted according to the required stopping force, with a preferred range from 20 to 60 degrees and more preferably 42 degrees.
  • The P’ shaft shoulder 31′ has an annular groove 310 on its side surface, and the closed cavity 1 has a corresponding annular protrusion 15 to fit with it.
  • The piston rod 22 has first and second annular grooves near the piston body 21, and these grooves contain first and second elastic retaining rings 41 and 42 with elliptical cross-sections.
• Functionality and Working Principle:
  • Similar to the principle in Example 1, the stop member moves with the piston assembly through connections.
  • When moving, the stop protrusion passes through certain parts of the cavity’s inner wall (first and second inner protrusions), causing decelerations, and eventually stops in the annular groove of the closed cavity.
  • Additionally, the annular protrusion and groove interaction and the interaction between the elastic retaining rings and the stop protrusion also contribute to the stopping mechanism.
  • The gas spring uses stiction and friction forces between components to achieve deceleration and stopping without an external power source.
• Advantages and Flexibility:
  • The gas spring has a simple structure, low processing difficulty, and a clever design concept.
  • It can be used in multiple fields, solving the problems of complex structures, high processing difficulty, and limited application fields of existing stop gas springs.
  • It also emphasizes that the design is not limited to the disclosed forms and can be modified and combined in various ways while staying within the scope of the patent’s claims, showing the patent’s flexibility and potential for further development.

Claims (10) – A Chronic Obstructive Pulmonary Stop Gas Spring, invented by LeiYan Gas Spring, a pioneer Chinese Gas Spring Manufacturer.

1. A chronic obstructive pulmonary stop gas spring, characterized in that it includes a closed cavity, a piston assembly arranged in the closed cavity, and a stop member. The piston assembly includes a piston body and a piston rod, the stop member is sleeved on the piston rod, the stop member includes an integrally connected shaft shoulder and a stop part, and a stop protrusion is provided at one end of the stop part away from the shaft shoulder.

This claim defines the basic structure of the chronic obstructive pulmonary stop gas spring, which consists of three main parts: the closed cavity, the piston assembly, and the stop member. The piston assembly contains a piston body and a piston rod, and the stop member is placed over the piston rod. The stop member itself has an integrated shaft shoulder and stop part, with a stop protrusion at one end of the stop part that is away from the shaft shoulder.

2. A chronic obstructive pulmonary stop gas spring according to claim 1, characterized in that the stop member is provided with a first through opening and a second through opening along its axial direction, and the first through opening and the second through opening are symmetrically arranged.

This claim further elaborates on the stop member by adding the feature of having first and second through openings that are symmetrically placed along its axial direction. These openings could potentially serve various purposes, such as facilitating fluid flow, reducing weight, or interacting with other components, although the specific function is not detailed here.

3. A chronic obstructive pulmonary stop gas spring according to claim 1, characterized in that the stop protrusion is a curved protrusion along the outer periphery of the stop part.

Here, the shape of the stop protrusion is specified as a curved protrusion located along the outer periphery of the stop part. This specific shape may play a crucial role in the interaction with other parts of the gas spring for achieving the desired stopping functionality.

4. A chronic obstructive pulmonary stop gas spring according to claim 3, characterized in that the inner wall of the closed cavity is provided with a first inner protrusion, a second inner protrusion, and a third inner protrusion, and a curved groove adapted to the curved protrusion is formed between the second inner protrusion and the third inner protrusion.

This claim builds on claim 3 by describing the inner wall of the closed cavity. It includes multiple inner protrusions, and between the second and third inner protrusions, there is a curved groove that is designed to fit with the curved protrusion of the stop member. This interaction between the curved groove and the curved protrusion is likely part of the stopping mechanism.

5. A chronic obstructive pulmonary stop gas spring according to claim 1, characterized in that a circular hole adapted to the shaft diameter of the connecting end of the piston rod is opened in the middle of the shaft shoulder.

This claim focuses on the shaft shoulder of the stop member, stating that there is a circular hole in its middle that is sized to fit the shaft diameter of the piston rod’s connecting end. This might be relevant for proper alignment, attachment, or some other mechanical function related to the interaction between the stop member and the piston rod.

6. A chronic obstructive pulmonary stop gas spring according to claim 1, characterized in that an annular groove is provided on the side surface of the shaft shoulder.

This claim adds an annular groove to the shaft shoulder of the stop member, which could potentially interact with other parts of the gas spring, perhaps for locking, guiding, or providing some form of mechanical interaction.

7. A chronic obstructive pulmonary stop gas spring according to claim 6, characterized in that an annular protrusion adapted to the annular groove is provided on the inner wall of the closed cavity.

This claim complements claim 6 by providing a corresponding annular protrusion on the inner wall of the closed cavity. The annular protrusion and the annular groove are designed to interact, possibly for a locking or stabilizing function.

8. A chronic obstructive pulmonary stop gas spring according to claim 1, characterized in that the stop protrusion is a double conical inner protrusion along the inner periphery of the stop part.

This claim offers an alternative shape for the stop protrusion, which is a double conical inner protrusion along the inner periphery of the stop part. Different from the curved protrusion in claim 3, this shape might have different mechanical properties and interactions with other parts of the gas spring.

9. A chronic obstructive pulmonary stop gas spring according to claim 8, characterized in that a first annular groove and a second annular groove are opened at one end of the piston rod near the piston body, and a first elastic retaining ring and a second elastic retaining ring are placed in the first annular groove and the second annular groove respectively.

Building on claim 8, this claim introduces the concept of annular grooves on the piston rod near the piston body and the placement of elastic retaining rings within them. These elastic retaining rings might contribute to the stopping mechanism, perhaps by providing additional resistance or control during the motion of the gas spring.

10. A chronic obstructive pulmonary stop gas spring according to claim 9, characterized in that the cross-sectional shapes of the first elastic retaining ring and the second elastic retaining ring are both elliptical.

This final claim specifies the cross-sectional shape of the elastic retaining rings as elliptical, which could affect their mechanical behavior, such as how they interact with other parts of the gas spring, possibly influencing the force distribution and stopping function of the gas spring.

These claims collectively define the various elements and features of the chronic obstructive pulmonary stop gas spring , outlining different aspects of its structure, and potentially how these features interact to achieve the desired stopping functionality. Each claim builds upon or modifies the basic gas spring described in claim 1, providing a comprehensive description of the possible configurations and characteristics of the gas spring while also protecting different aspects of the invention through patent rights.