Self-locking compressed gas spring

Abstract

The application discloses a self-locking compressed gas spring, which comprises a cylinder, one end of the cylinder being closed or sealed, the other end of the cylinder being provided with a first sealing assembly, and an inner thread being arranged on the inner wall of the cylinder; a piston located in the cylinder, an outer thread being arranged on the outer wall of the piston, and the cylinder and the piston being matched through the inner thread and the outer thread; a piston rod, one end of the piston rod being connected with the piston, and the other end of the piston rod being exposed outside the cylinder through the first sealing assembly; a supporting assembly, the cylinder or the piston rod being rotatably installed on the supporting assembly; gas, the gas being arranged in the cylinder, in a non-locking state, the gas acting on the piston and the cylinder or the piston rod connected with the piston being moved under the cooperation of the inner thread and the outer thread of the cylinder and the piston; and a locking mechanism being matched with the cylinder or the piston rod to form locking for the moved cylinder or the piston rod. The self-locking compressed gas spring has the advantages of stable state.

Description

TECHNICAL FIELD

[0001] The present application relates to a self-locking compressed gas spring. BACKGROUND

[0002] The high-pressure self-locking compressed gas spring is suitable for lifting and pitching of a seat, opening and closing of a door, and lifting of some mechanical devices. Since these devices are in direct contact with people, the gas spring is usually required to have high safety and reliability to ensure that no accidents occur during operation; the structure is simple to facilitate installation, use and maintenance; the required auxiliary power during operation should be small, the lifting force should be constant, and a buffer mechanism should be provided to avoid damage; during lifting, it should be ensured that it can stay at any position at any time.

[0003] The existing self-locking compressed gas spring is not entirely reasonable in structure. When the self-locking compressed gas spring is lifted to the required position, the pressure on both sides of the piston in the self-locking compressed gas spring is theoretically balanced. However, if the user inadvertently applies pressure or lifting force to the upper or lower part of the mechanism to be lifted (such as a table top or a table leg), the internal pressure of the gas spring will change, causing the upper or lower part of the mechanism to be lifted (such as a table top or a table leg) to become floating. Therefore, the current self-locking compressed gas spring cannot ensure the stability of its state during use. SUMMARY

[0004] The present application provides a self-locking compressed gas spring with stable state.

[0005] The scheme to achieve the above-mentioned purpose is as follows:

[0006] The self-locking compressed gas spring comprises:

[0007] A cylinder, one end of which is closed or sealed, and the other end of which is provided with a first sealing assembly, and an inner thread is provided on the inner wall of the cylinder;

[0008] A piston located in the cylinder, an outer thread is provided on the outer wall of the piston, and the cylinder and the piston are matched by the inner thread and the outer thread;

[0009] A piston rod, one end of which is connected to the piston, and the other end of which is exposed outside the cylinder through the first sealing assembly;

[0010] A support assembly, the cylinder or the piston rod is rotatably installed on the support assembly;

[0011] A gas, which is arranged in the cylinder, in a non-locking state, the gas acting on the piston and the cylinder or the piston rod connected to the piston moving under the cooperation of the inner thread and the outer thread of the cylinder and the piston;

[0012] A locking mechanism which, when engaged with the cylinder or the piston rod, locks the moving cylinder or piston rod.

[0013] The advantage of the present invention is that the self-locking compressed gas spring is made to rise or fall (when falling, the support mechanism (e.g. a table top) which needs to be raised and lowered exerts an external pressure) by the gas pressure acting on the piston and the cylinder or the piston rod connected to the piston being moved by the cylinder and the internal and external threads of the piston being engaged, when locking is needed, the locking mechanism is engaged with the moving cylinder or piston rod, the locking effect produced by the locking mechanism makes the cylinder or piston rod stop moving, locking the cylinder or piston rod, thus stopping the self-locking compressed gas spring from working, so that the self-locking compressed gas spring stops at any position. And the self-locking compressed gas spring obtains a state of being locked by the engagement of the locking mechanism with the cylinder or piston rod, so even if an upward or downward force is exerted on the upper or lower part (e.g. a table top or table leg) of the mechanism which needs to be raised and lowered, the locking of the self-locking compressed gas spring cannot be released, so that the self-locking compressed gas spring is always in a stable state after stopping working. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic diagram of the outer shape of the first self-locking compressed gas spring of the present invention.

[0015] Figure 2 It is a sectional view of the first self-locking compressed gas spring of the present invention.

[0016] Figure 3 It is a schematic diagram of the seat body in the first self-locking compressed gas spring.

[0017] Figure 4 It is a schematic diagram of the positioning component in the first self-locking compressed gas spring.

[0018] Figure 5 It is a sectional view of the second self-locking compressed gas spring of the present invention.

[0019] Figure 6 It is a sectional view of the third self-locking compressed gas spring of the present invention.

[0020] Figure 7 It is a schematic diagram of the second locking mechanism of the present invention.

[0021] Figure 8 It is a schematic diagram of the third locking mechanism of the present invention. DETAILED DESCRIPTION

[0022] Example 1

[0023] As Figure 1 and Figure 2As shown, the self-locking compression gas spring comprises a cylinder 1, a piston 2, a piston rod 3, gas, a support assembly 5, a locking mechanism 6. The following will be described in detail for each part and the relationship between each part:

[0024] As shown in Figure 1 and Figure 2 , one end of the cylinder 1 is sealed, the other end of the cylinder 1 is provided with a first sealing assembly, and the inner wall of the cylinder 1 is provided with an internal thread 11. One end of the cylinder 1 is provided with an opening, and the sealing of one end of the cylinder 1 is realized by a plug 12. One end of the plug 12 is fixedly connected with one end of the cylinder 1, and the other end of the plug 12 is used to connect the upper or lower part (such as the desktop or the table leg) of the mechanism that needs to be lifted.

[0025] As shown in Figure 1 and Figure 2 , preferably, the outer circumferential surface of the spacer sleeve 14 is provided with an annular groove, and after the spacer sleeve 14 is assembled into the cylinder 1, it is pressed inward from the outer wall of the cylinder 1, so that the inner wall of the cylinder 1 forms a protrusion, which is matched into the annular groove on the spacer sleeve 14, so that the spacer sleeve 14 and the cylinder 1 are fixed as a whole.

[0026] As shown in Figure 1 and Figure 2 , the piston 2 is located in the cylinder 1, and the outer wall of the piston 2 is provided with an external thread 21. The cylinder 1 and the piston 2 are matched by the internal thread 11 and the external thread 21, and the internal thread 11 and the external thread 21 are both non-self-locking threads. The piston 2 is provided with a vent structure, such as a vent hole or a vent groove, to facilitate the flow of gas on both sides of the piston 2 during the lifting work of the self-locking compression gas spring.

[0027] As shown in Figure 1 and Figure 2 , one end of the piston rod 3 is connected with the piston 2, and the other end of the piston rod 3 is exposed outside the cylinder 1 through the first sealing assembly; through the airtight cooperation between the first sealing assembly and the piston rod 3, the gas in the cylinder 1 is prevented from leaking.

[0028] As shown in Figure 1 and Figure 2As shown, the cylinder 1 or the piston rod 3 is rotatably mounted on the support assembly 5, so that the cylinder 1 or the piston rod 3 can produce rotary and / or linear motion during the lifting and lowering of the self-locking compressed gas spring. The specific motion of the cylinder 1 or the piston rod 3 is determined according to the specific use, for example, the support assembly 5 and the locking mechanism 6 are located at the lower part of the self-locking compressed gas spring, when the support assembly 5 is fixedly connected with the lower part of the mechanism to be lifted (for example, the leg of a table), there are two cases, one is that the cylinder 1 is connected with the upper part of the mechanism to be lifted (for example, the table top), the piston rod 3 is rotatably connected with the support assembly 5, when the self-locking compressed gas spring works, the cylinder 1 moves linearly, and the piston rod 3 rotates. The other is that the piston rod 3 is connected with the upper part of the mechanism to be lifted (for example, the table top), and the cylinder 1 is rotatably connected with the support assembly 5, when the self-locking compressed gas spring works, the piston rod 3 moves linearly, and the cylinder 1 rotates.

[0029] When the support assembly 5 and the locking mechanism 6 are located at the upper part of the self-locking compressed gas spring, and the support assembly 5 is connected with the upper part of the mechanism to be lifted (for example, the table top), there are two cases, one is that the piston rod 3 is fixedly connected with the lower part of the mechanism to be lifted (for example, the leg of a table), the cylinder 1 is rotatably connected with the support assembly 5, when the self-locking compressed gas spring works, the cylinder 1 moves linearly and rotates, and the piston rod 3 is fixed. The other is that the cylinder 1 is fixedly connected with the lower part of the mechanism to be lifted (for example, the leg of a table), the piston rod is rotatably connected with the support assembly 5, when the self-locking compressed gas spring works, the piston rod 3 moves linearly and rotates, and the cylinder 1 is fixed.

[0030] As shown in Figure 2 and Figure 3 In this embodiment, the support assembly 5 includes a seat body 51 and a bearing 52, the bearing 52 is mounted on the seat body 51, and the cylinder 1 or the piston rod 3 is matched with the bearing 52. A first cavity 53 is arranged on the seat body 51, and the bearing 52 is assembled in the first cavity 53. Preferably, a second cavity 54 is also arranged on the seat body 51, and the second cavity 54 and the first cavity 53 are mutually penetrated. A guide rail 55 is arranged on the inner wall surface of the second cavity 54, and the guide rail 55 is used to cooperate with the locking mechanism 6.

[0031] As shown in Figure 2 The gas is used to generate power, and the gas is arranged in the cylinder 1. In the non-locking state, the gas acting on the piston 2 and the cylinder 1 and the inner thread 11 and the outer thread 21 matched with the piston 2 make the cylinder 1 or the piston rod 3 connected with the piston 2 move. The motion of the cylinder 1 and the piston rod 3 is divided into the following two kinds:

[0032] The first is: the gas acting on the piston 1 in the non-locking state and the rotation of the piston 2 under the cooperation of the inner thread 11 of the cylinder 1 and the outer thread 21 of the piston 2, the piston rod 3 rotates with the piston 2, and the cylinder 1 moves linearly. The second is: the gas acting on the piston 2 in the non-locking state and the rotation of the cylinder 1 under the cooperation of the inner thread 11 of the cylinder 1 and the outer thread 21 of the piston 2, the piston 2 and the piston rod 3 move linearly. These two cases are determined by the connection of the cylinder 1 or the piston rod 3 with the upper or lower part (such as the desktop or the table leg) of the mechanism that needs to be lifted.

[0033] As shown in Figure 2 The locking mechanism 6 cooperates with the cylinder 1 or the piston rod 3 to lock the moving cylinder 1 or piston rod 3. At least part of the locking mechanism 6 is installed on the support assembly 5. As known from the above, the movement state of the cylinder 1 and the piston rod 3 is rotation and / or linear motion respectively. In this embodiment, the locking mechanism 6 preferentially locks the cylinder 1 or the piston rod 3 in rotation, so the locking mechanism 6 in this embodiment is a rotation locking mechanism that limits the rotation of the cylinder 1 or the piston rod 3.

[0034] As shown in Figures 2 to 4 The rotation locking mechanism includes a gear 61, a positioning component 62, a traction assembly 63, and an elastic component 64. The gear 61 is fixed with the cylinder 1 or the piston rod 3. The positioning component 62 cooperates with the gear 61 to limit the rotation of the gear 61. When the gear 61 is limited in rotation, the cylinder 1 or the piston rod 3 also stops rotating, so that the self-locking compression gas spring is in a locked state.

[0035] As shown in Figures 2 to 4 The positioning component 62 includes a moving seat 62a and a tooth 62b. The tooth 62b is arranged at one end of the moving seat 62a. The two sides of the moving seat 62a are respectively provided with grooves 62c. The grooves 62c are gap-fitted with the guide rails 55. When the moving seat 62a moves, the cooperation of the grooves 62c and the guide rails 55 forms a guiding effect for the positioning component 62, avoiding the deflection of the positioning component 62. A recess 62d is arranged on the positioning component 62, and one end of the traction assembly 63 is fitted in the recess 62d. A spring seat 62e is arranged at the other end of the moving seat 62a, and the spring seat 62e is provided with a notch 62f or a hole for the traction assembly 63 to pass through.

[0036] As shown in Figures 2 to 4As shown, the traction component 63 drives the positioning component 62 to separate from the gear 61, and the traction component 63 is connected to the positioning component 62. The traction component includes a sleeve 63a and a cable 63b. One end of the sleeve 63a is fixed to the support component 5. Preferably, one end of the sleeve 63a is fixed to the seat 51. The cable 63b passes through the sleeve 63a and is connected to the positioning component 62. Preferably, one end of the cable 63b is provided with a head 63c. The head 63c is located in the groove 62d. The width of the head 63c is greater than the width of the notch 62f, so that the head 63c is limited in the groove 62d.

[0037] like Figures 2 to 4 As shown, a traction force is manually applied to the cable 63b, which is transmitted to the head 63c. The head 63c moves the positioning component 62, thereby separating the positioning component 62 from the gear 61. The circumferential direction of the gear 61 is no longer restricted, and thus the circumferential direction of the cylinder 1 or piston rod 3 is no longer restricted. The gas acting on the piston 2, and the interaction between the internal thread 11 and the external thread 21 of the cylinder 1 and piston 2, cause the cylinder 1 or the piston rod 3 connected to the piston 2 to rotate.

[0038] like Figures 2 to 4 As shown, the elastic component 64 is fitted onto the traction assembly 63. One end of the elastic component 64 engages with the positioning component 62, and the other end engages with the traction assembly 63 or the supporting component 5. The elastic component 64 is preferably a spring. One end of the elastic component 64 fits onto the spring seat 62e and forms abutment with the moving seat 62a, while the other end abuts with the sleeve 63a of the traction assembly 63. When a traction force is manually applied to the cable 63b, the moving seat 62a moves, compressing the elastic component 64. After the traction assembly 63 releases its force on the positioning component 62, the elastic component 64 causes the positioning component 62 to engage with the gear 61, thus releasing the traction force applied to the cable 63b. The positioning component 62 then resets under the action of the elastic component 64, thereby locking the cylinder 1 or piston rod 3 circumferentially.

[0039] This invention is not limited to the above embodiments, for example:

[0040] (a) One end of the cylinder barrel 1 can also adopt a closed structure. The closed structure is integrally formed with the cylinder barrel 1, that is, when manufacturing the cylinder barrel 1, one end of the cylinder barrel 1 is not open.

[0041] (b), such as Figure 5 As shown, the cylinder 1 includes an inner cylinder 1a and an outer cylinder 1b. The inner cylinder 1a is made of non-metallic material, and the outer cylinder 1b is fitted onto the inner cylinder. The outer cylinder 1b is made of metallic material. The outer cylinder 1b increases the strength of the inner cylinder 1a. The non-metallic inner cylinder 1a can be formed by injection molding, which helps to reduce the manufacturing difficulty of the inner cylinder 1a.

[0042] (c), as shown in Figure 6 The material of the cylinder 1 is metal, and the internal thread 11 on the inner wall of the cylinder 1 is continuously extruded from the outer wall to the inner wall in the spiral direction, which forms a spiral groove on the outer wall of the cylinder 1 and a thread on the inner wall of the cylinder 1. For example, the slotting device disclosed in CN100460794C is used to extrude the thread on the cylinder 1.

[0043] (d), as shown in Figure 2 The above embodiment 1 describes that the cylinder 1 and the piston rod 3 have linear and / or rotational movement states, and the above embodiment 6 is a locking mechanism that limits the rotation of the cylinder 1 or the piston rod 3. In this regard, the locking mechanism 6 can also lock the cylinder 1 or the piston rod 3 in linear lifting motion, for example, using a clamping locking mechanism to hold the cylinder 1 or the piston rod 3 in linear lifting motion, so that the cylinder 1 or the piston rod 3 cannot be lifted or lowered, and the clamping locking mechanism forms a locking effect on the cylinder 1 or the piston rod 3. The clamping locking mechanism is also applicable to the locking of the rotating cylinder 1 or the piston rod 3.

[0044] As shown in Figure 7 The clamping locking mechanism includes an inner support 71, an outer support 72, a swing rod 73, a clamping block 74, and a pull rope. One end of the inner support 71 is fixed to the upper part or the lower part of the mechanism that needs to be lifted (such as the desktop or the table leg), and the cylinder 1 or the piston rod 3 passes through the inner support. The middle part of the swing rod 73 is hinged to the inner support 71, one end of the outer support 71 is hinged to one end of the swing rod 73, and the other end of the swing rod 73 is connected to the clamping block 74. The pull rope is connected to the outer support. When it is needed to stop the cylinder 1 or the piston rod 3 from lifting, a pulling force is applied to the pull rope, the swing rod 73 swings, and the clamping block 74 generates a clamping force on the cylinder 1 or the piston rod 3, so that the cylinder 1 or the piston rod 3 stops lifting. The pull rope can be fixed to the upper part or the lower part of the mechanism that needs to be lifted (such as the desktop or the table leg), so that the clamping force generated by the clamping block 74 on the cylinder 1 or the piston rod 3 is maintained. When it is needed to lift the cylinder 1 or the piston rod 3, the pulling force of the pull rope is released, and the swing rod 73 is in a free state. At this time, the clamping block 74 is separated from the cylinder 1 or the piston rod 3, and the clamping block 74 does not generate a clamping force on the cylinder 1 or the piston rod 3.

[0045] (e), the locking mechanism 6 can also have the following structure:

[0046] As shown in Figure 8As shown, the locking mechanism 6 comprises a first friction disc 75, a second friction disc 76, a spring 77, a push rod 78, and a guide rod 79. The first friction disc 75 is fixed to the cylinder 1 or the piston rod 3. One end of the spring 77 abuts against the second friction disc 76, and the other end of the spring 77 abuts against the support assembly 5. The second friction disc 76 is provided with an assembly hole. One end of the guide rod 79 is connected to the support assembly 5, and the other end of the guide rod 79 extends into the assembly hole of the second friction disc 76.

[0047] The second friction disc 76 is limited from rotating by the guide rod 79. In the locking state, the second friction disc 76 is combined with the first friction disc 75 by the force of the spring 77. The first friction disc 75 and the second friction disc 76 are combined by the friction force, so that the first friction disc 75 cannot rotate, thereby locking the cylinder 1 or the piston rod 3. When the push rod 78 is subjected to a force, the second friction disc 76 is separated from the first friction disc 75. The first friction disc 75 is no longer subjected to the friction force, so that the piston 2 rotates the cylinder 1 or the piston rod 3 under the cooperation of the gas and the inner thread 11 and the outer thread 21.

[0048] (f) The locking mechanism 6 can also adopt a spline locking structure. For example, an inner hole is arranged at the end of the piston rod 3 connected to the support assembly 5, and a spline groove is arranged in the inner hole. The locking mechanism 6 comprises an axially movable spline shaft. When the spline shaft extends into the inner hole to form a spline groove fit, the piston rod 3 cannot rotate. When the spline shaft is separated from the piston rod 3, the piston 2 rotates the piston rod 3 under the cooperation of the gas and the inner thread 11 and the outer thread 21.

[0049] (g) The first sealing assembly can also only adopt a rubber ring. An annular groove is arranged on the inner wall of the cylinder 1, and a part of the rubber ring is fixed in the annular groove. Alternatively, the first sealing assembly comprises an annular skeleton and a flexible annular sealing member (such as a rubber ring). The annular sealing member is covered on the annular skeleton. An annular groove is arranged on the inner wall of the cylinder 1, and a part of the annular skeleton is fixed in the annular groove.

Claims

1. A self-locking compressed gas spring, characterized in that, The utility model relates to a self-locking compressed gas spring, comprising: a cylinder, one end of the cylinder is sealed, the other end of the cylinder is provided with a first sealing assembly, and an inner thread is arranged on the inner wall of the cylinder; a piston located in the cylinder, an outer thread is arranged on the outer wall of the piston, and the cylinder and the piston are matched through the inner thread and the outer thread; a piston rod, one end of the piston rod is connected with the piston, and the other end of the piston rod is exposed outside the cylinder through the first sealing assembly; a support assembly, the cylinder or the piston rod is rotatably installed on the support assembly; a gas, the gas is arranged in the cylinder, in a non-locking state, the gas acting on the piston and the cylinder or the piston rod connected with the piston are moved under the cooperation of the inner thread and the outer thread of the cylinder and the piston; a locking mechanism matched with the cylinder or the piston rod to lock the moving cylinder or piston rod; the first sealing assembly comprises a sealing part, a spacer sleeve and a top sleeve, the sealing part is located between the spacer sleeve and the top sleeve, the spacer sleeve and the top sleeve are fixed in the cylinder respectively, an annular groove is arranged on the outer circumferential surface of the spacer sleeve, and the spacer sleeve is press-fitted into the cylinder from the outer wall of the cylinder, so that a protrusion is formed on the inner wall of the cylinder, the protrusion is matched into the annular groove on the spacer sleeve, and the spacer sleeve is fixed integrally with the cylinder; an air vent structure is arranged on the piston to facilitate the flow of the gas on both sides of the piston during the lifting work of the self-locking compressed gas spring; at least a part of the locking mechanism is installed on the support assembly; the locking mechanism is a rotation locking mechanism for limiting the rotation of the cylinder or the piston rod; the rotation locking mechanism comprises: a gear fixed with the cylinder or the piston rod; a positioning part matched with the gear to limit the rotation of the gear, when the gear is limited to rotate, the cylinder or the piston rod also stops rotating, so that the self-locking compressed gas spring is in a locking state; a traction assembly connected with the positioning part; a resilient part sleeved on the traction assembly, one end of the resilient part is matched with the positioning part, and the other end of the resilient part is matched with the traction assembly or the support assembly; the traction assembly comprises: a sleeve, one end of the sleeve is fixed with the support assembly; a cable, the cable is connected with the positioning part after passing through the sleeve; the support assembly comprises a seat body and a bearing, the bearing is installed on the seat body, the cylinder or the piston rod is matched with the bearing, a first cavity is arranged on the seat body, the bearing is assembled in the first cavity, a second cavity is further arranged on the seat body, the second cavity and the first cavity are mutually penetrated, and a guide rail for matching with the locking mechanism is arranged on the inner wall surface of the second cavity; the positioning part comprises a moving seat and a tooth, the tooth is arranged on one end of the moving seat, grooves are arranged on both sides of the moving seat respectively, the grooves are matched with the guide rail with a gap, when the moving seat moves, the cooperation of the grooves and the guide rail forms a guiding effect on the positioning part, so that the positioning part is prevented from being deflected, a recess is arranged on the positioning part, one end of the traction assembly is assembled in the recess, a spring seat is arranged on the other end of the moving seat, and a notch or a hole is arranged on the spring seat to pass through the traction assembly; the traction assembly drives the positioning part to separate from the gear, one end of the sleeve is fixed with the seat body of the support assembly, the cable is connected with the positioning part after passing through the sleeve, a head is arranged on one end of the cable, the head is located in the recess, and the width of the head is greater than the width of the notch, so that the head is limited in the recess; One end of the elastic component is sleeved on the spring seat and abuts against the moving seat, and the other end of the elastic component abuts against the sleeve of the traction assembly; when the traction force is manually applied to the cable, the moving seat moves to compress the elastic component, the elastic component makes the positioning component cooperate with the gear after the traction assembly releases the positioning component, the traction force applied to the cable is released, and the positioning component resets under the action of the elastic component to lock the cylinder or the piston rod in the circumferential direction.

2. The self-locking compressed gas spring of claim 1, wherein, In the non-locking state, the gas acting on the piston and the cooperation of the internal thread of the cylinder and the external thread of the piston make the piston move linearly and / or rotate, and the piston rod moves linearly and / or rotates with the piston.

3. The self-locking compressed gas spring of claim 1, wherein, In the non-locking state, the gas acting on the piston and the cooperation of the internal thread of the cylinder and the external thread of the piston make the cylinder move linearly and / or rotate.

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