CN220121243U - Telescopic stay tube and support foot rest - Google Patents

Abstract

The utility model discloses a telescopic supporting tube and a supporting foot stool, wherein the supporting tube comprises at least two layers of axially telescopic tube bodies and a pneumatic buffer structure connected between two adjacent layer tube bodies; the pneumatic buffer structure comprises a plug bush and a flexible sealing element, wherein the plug bush is connected to the inner pipe body in a sealing way, the flexible sealing element is fixed at one end of the plug bush, and a buffer cavity is formed by enclosing the flexible sealing element and the outer pipe body; when the inner layer pipe body descends, the flexible sealing element is sealed with the inner wall of the outer layer pipe body; when the inner tube body is stretched upward, the flexible seal member does not seal with the inner wall of the outer tube body. Through setting up pneumatic buffer structure between the double-deck body, because be pneumatic buffering, the pneumatic buffering effort in the cushion chamber is the automatic production of adaptation supporting part's weight, no matter the weight size of supporting part, can both play the buffering effect that suits, and the body can all be by quick whereabouts by the buffering for slowly whereabouts, and can not produce the resilience, the supporting part on the more effective protection stay tube.

Description

Telescopic stay tube and support foot rest

Technical Field

The utility model relates to the technical field of instrument supporting devices, in particular to a telescopic supporting tube and a supporting foot rest.

Background

In the industry of lamp supporting foot frames, in order to protect lamps, metal springs are often added in supporting tubes of the foot frames, so that a certain buffer effect is achieved after the supporting tubes are unlocked, and damage to the lamps due to falling impact is avoided.

However, the elastic force of the metal spring is fixed, when the lamp is light in weight, the spring can repeatedly bounce under the impact force generated by falling of the lamp and sliding of the supporting tube, and the lamp can repeatedly bounce under the action of the elastic force, so that the lamp is easily damaged; when the lamp is heavy, the elasticity of the spring is fixed, and the elasticity is possibly insufficient for buffering, so that the lamp can still be damaged due to impact. Therefore, because the elasticity of the spring in the supporting tube is fixed, the existing lamp supporting foot stool can only be used for supporting lamps in a specific weight range, and when the lamps with heavy weight or light weight are arranged on the supporting foot stool, the lamps are easy to damage; in addition, the metal spring can only be installed at the bottom of the supporting tube, the buffer effect is required to be generated when the supporting tube is in sliding contact with the spring, the lamp is possibly damaged before the buffer of the impact because a larger falling stroke is generated, and therefore the service range of the lamp supporting foot rest is limited, and the improvement is inherent.

Content of the application

Therefore, the technical problem to be solved by the utility model is to overcome the defect that the lamp is easily damaged by the support tube using the metal spring as the buffer structure in the prior art, thereby providing a telescopic support tube.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

a telescopic supporting tube comprises at least two layers of tube bodies which are sleeved in sequence from inside to outside and can axially stretch and retract, and a pneumatic buffer structure connected between the adjacent two layers of tube bodies; the air pressure buffer structure comprises a plug bush and a flexible sealing element, wherein the plug bush is connected onto an inner layer pipe body in two adjacent layer pipe bodies in a sealing mode, the flexible sealing element is fixedly connected to one end of the plug bush, a buffer cavity is formed by enclosing an outer layer pipe body in the two adjacent layer pipe bodies, and an exhaust hole for communicating the buffer cavity with outside air is formed in the pipe wall of the outer layer pipe body; when the inner layer pipe body is contracted inwards towards the outer layer pipe body, the flexible sealing element is sealed with the inner wall of the outer layer pipe body; when the inner layer pipe body extends out of the outer layer pipe body, the flexible sealing element is not sealed with the inner wall of the outer layer pipe body.

Further, the pipe wall of the outer pipe body is provided with an exhaust hole communicated with the buffer cavity and the outside air.

Further, the diameter of the exhaust hole is 0.5-1.0mm.

Further, an outer concave cavity communicated with the buffer cavity is formed in the flexible sealing element, and an opening of the outer concave cavity is arranged towards the buffer cavity; when the gas pressure in the outer cavity is increased, the gas pressure acts on the inner wall of the flexible sealing element corresponding to the outer cavity part so as to seal the outer wall of the flexible sealing element with the inner wall of the outer tube body.

Further, the flexible sealing element comprises a main body section and a flexible sealing section which are integrally connected, the main body section is fixedly connected with the plug bush, the outer diameter of the flexible sealing section is larger than that of the main body section, and the outer concave cavity is formed in the flexible sealing section.

Further, the outer diameter of the flexible seal segment gradually increases in a direction from the flexible seal to the buffer chamber.

Further, the plug bush comprises a plug bush sealing section and a plug bush connecting section which are integrally connected, the outer wall of the plug bush sealing section is in sealing connection with the inner wall of the inner layer pipe body, the outer diameter of the plug bush connecting section is larger than that of the plug bush sealing section, the outer wall of the plug bush connecting section is attached to the inner wall of the outer layer pipe body, and the main body section of the flexible sealing element is connected to the plug bush connecting section.

Further, the plug bush connecting section is provided with a first groove at one end connected with the main body section, the main body section is fixedly connected in the first groove, the outer wall of the main body section is attached to the groove wall of the first groove, an inner concave cavity communicated with the outer concave cavity is arranged in the main body section, and when the gas pressure in the inner concave cavity is increased, the gas pressure acts on the inner wall of the main body section to enable the outer wall of the plug bush connecting section to be tightly attached to the inner wall of the outer pipe body.

Further, the main body section is fixedly connected with the plug bush connecting section through a screw.

Further, the outer wall of the flexible sealing element is in sealing connection with the plug bush connecting section through glue, and the outer wall of the plug bush sealing section is in sealing connection with the inner wall of the inner layer pipe body through glue.

Further, a second groove is formed in the plug bush sealing section, and an opening of the second groove is arranged back to the buffer cavity.

Further, a locking piece for locking the inner layer pipe body on the outer layer pipe body is further arranged on the outer layer pipe body.

Further, the pneumatic buffer structure and the locking piece are arranged between any two adjacent layers of the pipe bodies.

Further, the telescopic supporting tube further comprises a top sealing seat connected to the top of the innermost tube body and a bottom sealing seat connected to the bottom of the outermost tube body in a sealing manner, and the top sealing seat is provided with a connecting column suitable for installing a supported component.

The utility model also provides a support foot rest comprising a foot rest and a telescopic support tube as described above supported by the foot rest.

The technical scheme of the utility model has the following advantages:

1. according to the telescopic support tube provided by the utility model, the air cushion structure consisting of the plug bush and the flexible sealing element is arranged between two adjacent layers of telescopic tube bodies, when the inner layer tube body is pulled upwards, the flexible sealing element and the inner wall of the outer layer tube body are not sealed, air in the cushion cavity and air in the inner layer tube body can be quickly exchanged, the action of stretching the inner layer tube body upwards can be quickly completed, the action of stretching the inner layer tube body upwards is not slow due to air pressure resistance, and therefore, the support part can be arranged on the support tube at a lower height position and then performs the upward stretching action of the inner layer tube body, so that the erection operation of the support part is more convenient; when the inner layer pipe body falls into the outer layer pipe body, the flexible sealing element and the inner wall of the outer layer pipe body are sealed, air in the buffer cavity can only be discharged outwards through the exhaust hole, the air pressure in the buffer cavity can be rapidly increased due to insufficient exhaust capacity of the exhaust hole, and the air pressure resistance applied to the inner layer pipe body during falling naturally increases, so that an air pressure buffer effect is generated, and the inner layer pipe body is buffered from rapid falling to slow falling; the air pressure buffering acting force in the buffering cavity is automatically generated by adapting to the weight of the inner layer pipe body and the supporting component on the inner layer pipe body, and the adaptive buffering effect can be achieved no matter the weight of the supporting component; compared with the mode of adopting a metal spring as a buffer component in the prior art, the pneumatic buffer mode solves the problem that the metal spring can only play a certain role in buffering a supporting component with specific weight, so that the supporting pipe can safely fall under the condition that the supporting components with different weights are supported, and the rebound can not be generated in the falling process of an inner-layer pipe body, and the safety of the supporting component on the supporting pipe can be effectively protected; moreover, the air pressure buffering mode is automatically generated in the full stroke of the falling of the inner layer pipe body, so that the impact can be quickly and timely slowed down, and the problem that the supporting part on the supporting pipe is damaged before impact buffering can be avoided. In addition, set up the exhaust hole on the pipe wall of outer body and do not set up the scheme of exhaust hole and compare, on the one hand can avoid leading to the problem that the inlayer body can't drop completely even rebound to appear because of the buffer intracavity atmospheric pressure is too high, on the other hand can avoid leading to the problem that sealed inefficacy because of the buffer intracavity atmospheric pressure leads to gaseous follow flexible sealing member and outer body inner wall to dash out.

2. The diameter of the vent hole of the telescopic support tube provided by the utility model is 0.5-1.0mm, when the diameter of the vent hole is smaller than 0.5mm, the venting capacity of the vent hole is too small, the air pressure in the buffer cavity is too high, the inner layer tube body is difficult to fall down and inconvenient to use, even the problem of sealing failure between the flexible sealing element and the inner wall of the outer layer tube body can be caused when the load is heavy, and when the diameter of the vent hole is larger than 1.0mm, the venting capacity of the vent hole is too large, the air pressure in the buffer cavity is too low, and the generated air pressure buffer acting force is too small to play a role in effective buffer.

3. According to the telescopic supporting tube, the outer concave cavity communicated with the buffer cavity is formed in the flexible sealing element, when the air pressure in the buffer cavity is increased, the air pressure in the outer concave cavity is increased, at the moment, the air pressure in the outer concave cavity applies acting force towards the inner wall of the outer pipe body to the inner wall of the outer concave cavity part corresponding to the flexible sealing element, the acting force enables the outer wall of the flexible sealing element to be tightly attached to the inner wall of the outer pipe body, the tightness is better, and the sealing effect between the flexible sealing element and the outer pipe body is better as the air pressure in the buffer cavity is larger, so that the problem of sealing failure between the flexible sealing element and the outer pipe body due to overhigh air pressure in the buffer cavity can be well avoided.

4. According to the telescopic supporting tube provided by the utility model, the outer diameter of the flexible sealing section is gradually increased in the direction from the flexible sealing element to the buffer cavity, so that the sealing effect between the flexible sealing section and the outer layer tube body is improved.

5. According to the telescopic supporting tube provided by the utility model, the outer wall of the plug bush sealing section is in sealing connection with the inner wall of the inner tube body, so that gas leakage at the position can be avoided; the external diameter of plug bush linkage segment is greater than the external diameter of plug bush seal segment and the outer wall of plug bush linkage segment is laminated mutually with the inner wall of outer layer body, so can reduce the clearance between plug bush linkage segment and the outer layer body, be favorable to flexible seal and outer layer body to realize sealedly.

6. According to the telescopic supporting tube, the first groove is formed in the plug sleeve connecting section, the main body section is fixedly connected in the first groove, so that the connecting contact area between the main body section and the plug sleeve connecting section can be increased, the connection reliability and the connection tightness between the main body section and the plug sleeve connecting section are improved, and air leakage in a gap between the main body section and the plug sleeve connecting section is avoided; when the gas pressure in the inner concave cavity increases, the gas pressure in the inner concave cavity applies an acting force towards the inner wall of the outer pipe body to the inner wall of the main body section, so that the gap between the outer wall of the plug sleeve connecting section and the inner wall of the outer pipe body can be reduced, and sealing is facilitated.

7. According to the telescopic supporting tube provided by the utility model, the outer wall of the flexible sealing element is in sealing connection with the plug bush connecting section through glue, and the outer wall of the plug bush sealing section is in sealing connection with the inner wall of the inner-layer tube body through glue; by means of glue connection, sealing reliability can be improved.

8. According to the telescopic support tube provided by the utility model, the locking piece for locking the inner layer tube body on the outer layer tube body is arranged on the outer layer tube body, and after the height of the inner layer tube body is adjusted in place, the locking of the inner layer tube body and the outer layer tube body can be realized through the locking piece, so that the support part on the support tube is stably kept at the required height.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the whole structure of a support stand according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a support tube provided by an embodiment of the present utility model;

fig. 3 is an enlarged view at a in fig. 2.

Reference numerals illustrate: 1. a support tube; 2. a foot rest; 21. a fixing ring; 22. supporting feet; 23. a hinged plate; 3. a locking member; 11. a tube body; 11a, an inner layer pipe body; 11b, an outer layer tube body; 12. a plug sleeve; 121. a sleeve sealing section; 1211. a second groove; 122. a sleeve connecting section; 1221. a first groove; 13. a flexible seal; 131. a main body section; 132. a flexible sealing section; 133. an outer cavity; 134. an inner cavity; 14. a buffer chamber; 15. an exhaust hole; 16. a screw; 17. a locking member; 18. a top seal seat; 181. a connecting column; 19. and a bottom sealing seat.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

A support foot rest as shown in fig. 1-3 comprises a support tube 1, a foot rest 2 and a locking member 3. The foot rest 2 comprises a fixed ring 21 sleeved on the periphery of the support tube 1, three support legs 22 with one end hinged on a connecting head of the fixed ring 21, and a hinged plate 23 with one end hinged on the lower position of the middle part of the support legs 22 and the other end hinged on the bottom of the support tube 1; the position of the fixing ring 21 in the axial direction of the support tube 1 is adjustable. The locking piece 3 is a locking knob which is connected to the fixing ring 21 in a threaded manner and one end of the locking knob abuts against the outer wall of the supporting tube 1, and the supporting tube 1 can be fixed to the fixing ring 21 by adjusting the locking knob.

In this embodiment, the support tube 1 is a multi-layer telescopic tube structure sleeved in turn from inside to outside by the multi-layer tube body 11, and the support tube 1 further comprises a top sealing seat 18 connected to the top of the innermost tube body 11 and a bottom sealing seat 19 connected to the bottom of the outermost tube body 11 in a sealing manner; the top seal housing 18 is provided with a connecting post 181 adapted to mount a support member. Specifically, one end of the top sealing seat 18 is inserted into the interior of the innermost tube 11 to close the upper end opening of the innermost tube 11, and the lower end of the outermost tube 11 is inserted into the bottom sealing seat 19 to close the lower end opening of the outermost tube 11; the other end of the hinge plate 23 is hinged to the connection lugs on the periphery of the bottom sealing seat 19.

In the present embodiment, the support tube 1 is provided with an air pressure buffer structure connected between the adjacent two layer tube bodies 11; the air pressure buffer structure comprises a plug bush 12 which is connected on an inner layer pipe body 11a in the adjacent two layer pipe bodies 11 in a sealing way and a flexible sealing element 13 which is fixedly connected at one end of the plug bush 12. The flexible sealing element 13 and the outer layer tube body 11b in the adjacent two-layer tube body 11 are enclosed to form a buffer cavity 14, and the tube wall of the outer layer tube body 11b is provided with an exhaust hole 15 for communicating the buffer cavity 14 with outside air; when the inner tube body 11a is contracted inward toward the outer tube body 11b, the flexible seal member 13 seals with the inner wall of the outer tube body 11 b; when the inner tube body 11a is extended outward of the outer tube body 11b, the flexible seal member 13 is not sealed with the inner wall of the outer tube body 11 b.

According to the telescopic supporting tube, the air pressure buffer structure consisting of the plug bush 12 and the flexible sealing element 13 is arranged between two adjacent layers of telescopic tube bodies 11, when the inner tube body 11a is pulled upwards, the flexible sealing element 13 and the inner wall of the outer tube body 11b are not sealed, air in the buffer cavity 14 and air in the inner tube body 11a can be quickly exchanged, the action of stretching the inner tube body 11a upwards can be quickly completed, the action of stretching the inner tube body 11a upwards is slow due to air pressure resistance, and therefore the supporting component can be mounted on the connecting column 181 at a lower height position and then the upward stretching action of the inner tube body 11a is carried out, so that the erection operation of the supporting component is more convenient. When the inner layer tube body 11a falls into the outer layer tube body 11b, at this time, the flexible sealing member 13 and the inner wall of the outer layer tube body 11b are sealed, air in the buffer chamber 14 can only be discharged outwards through the air discharge hole 15, and the air pressure in the buffer chamber 14 can be rapidly increased due to insufficient air discharge capacity of the air discharge hole 15, and the air pressure resistance received when the inner layer tube body 11a falls naturally increases, so that an air pressure buffer effect is generated, and the inner layer tube body 11a is buffered from rapid falling to slow falling; the pneumatic buffering force in the buffer cavity 14 is automatically generated in response to the weight of the inner layer pipe body 11a and the supporting component thereon, and the corresponding buffering effect can be achieved no matter the weight of the supporting component. Compared with the mode of adopting a metal spring as a buffer component in the prior art, the pneumatic buffer mode solves the problem that the metal spring can only play a certain role in buffering a specific weight supporting component, so that the supporting pipe 1 can safely fall under the condition of supporting the supporting components with different weights, and the inner-layer pipe body 11a can not rebound in the falling process, and the safety of the supporting component on the supporting pipe 1 can be effectively protected; moreover, the air pressure buffering mode is automatically generated in the full stroke of the falling of the inner layer pipe body 11a, so that the impact can be quickly and timely slowed down, and the problem that the supporting part on the supporting pipe 1 is damaged before the impact buffering can be avoided. In addition, the exhaust hole 15 is formed in the pipe wall of the outer layer pipe body 11b, compared with the scheme that the exhaust hole 15 is not formed in the pipe wall of the outer layer pipe body 11b, the problem that the inner layer pipe body 11a cannot fall down completely or even rebound due to the fact that the air pressure in the buffer cavity 14 is too high can be avoided, and the problem that sealing is invalid due to the fact that air rushes out of the inner walls of the flexible sealing element 13 and the outer layer pipe body 11b due to the fact that the air pressure in the buffer cavity 14 is too high can be avoided.

Further, the diameter of the exhaust hole 15 is 0.5-1.0mm; when the diameter of the vent hole 15 is smaller than 0.5mm, the venting capacity of the vent hole 15 is too small, the air pressure in the buffer cavity 14 is too high, the inner layer pipe body is difficult to fall down and inconvenient to use, even the problem of sealing failure between the flexible sealing element 13 and the inner wall of the outer layer pipe body 11b can be caused when the load is heavy, when the diameter of the vent hole 15 is larger than 1.0mm, the venting capacity of the vent hole 15 is too large, the air pressure in the buffer cavity 14 is too low, and the generated air pressure buffer acting force is too small to play a role in effective buffer. In addition, the aperture size of the vent hole 15 can be reasonably designed within the range of 0.5-1.0mm to realize the control of the falling speed of the inner pipe body 11.

In some implementations of the present embodiment, the flexible seal 13 is made of rubber or other material that is flexible. The flexible sealing element 13 comprises a main body section 131 and a flexible sealing section 132 which are integrally formed, the main body section 131 is fixedly connected with the plug bush 12, an outer concave cavity 133 communicated with the buffer cavity 14 is arranged in the flexible sealing section 132, and an opening of the outer concave cavity 133 is arranged towards the buffer cavity 14; when the gas pressure in the outer cavity 133 increases, the gas pressure acts on the inner wall of the portion of the flexible seal member 13 corresponding to the outer cavity 133 to seal the outer wall of the flexible seal member 13 with the inner wall of the outer tube 11 b. By arranging the outer concave cavity 133 communicated with the buffer cavity 14 in the flexible sealing element 13, when the air pressure in the buffer cavity 14 is increased, the air pressure in the outer concave cavity 133 is also increased, at this time, the air pressure in the outer concave cavity 133 applies a force to the inner wall of the part of the flexible sealing element 13 corresponding to the outer concave cavity 133 towards the inner wall of the outer layer pipe body 11b, and the force enables the fit between the outer wall of the flexible sealing element 13 and the inner wall of the outer layer pipe body 11b to be tighter, so that the tightness is better; moreover, the greater the air pressure in the buffer cavity 14 is, the better the sealing effect between the flexible sealing element 13 and the outer layer pipe body 11b is, and the problem that the sealing between the flexible sealing element 13 and the outer layer pipe body 11b is invalid due to the too high air pressure in the buffer cavity 14 can be well avoided.

Further, the outer diameter of the flexible sealing section 132 is larger than the outer diameter of the main body section 131, and the flexibility of the flexible sealing section 132 is larger than the flexibility of the main body section 131, so that the flexible sealing section 132 is more easily deformed under the action of air pressure, thereby realizing sealing or unsealing of the outer layer pipe 11 b. In alternative embodiments, the outer diameter of the flexible sealing section 132 may also be equal to the outer diameter of the body section 131.

In some implementations of this embodiment, the outer diameter of the flexible sealing section 132 gradually increases in the direction from the flexible sealing member 13 to the corresponding buffer chamber 14, so that the distance between the end of the flexible sealing member 13 with the larger outer diameter and the inner wall of the outer tube 11b is smaller under the condition of no stress, which is beneficial to improving the sealing effect between the flexible sealing section 132 and the outer tube 11 b. In alternative embodiments, the flexible seal 13 may also be a cylindrical structure with an equal overall outer diameter.

In some implementations of this embodiment, the sleeve 12 includes an integrally formed sleeve sealing section 121 and a sleeve connecting section 122, the outer wall of the sleeve sealing section 121 is in sealing connection with the inner wall of the inner layer tube 11a, the outer diameter of the sleeve connecting section 122 is greater than the outer diameter of the sleeve sealing section 121, and the outer wall of the sleeve connecting section 122 is attached to the inner wall of the outer layer tube 11b, and the main section 131 of the flexible seal 13 is fixedly connected to the sleeve connecting section 122. The outer wall of the sleeve sealing section 121 is in sealing connection with the inner wall of the inner-layer pipe body 11a, so that gas leakage can be avoided; the external diameter of plug bush linkage segment 122 is greater than the external diameter of plug bush seal segment 121 and the outer wall of plug bush linkage segment 122 is laminated mutually with the inner wall of outer layer body 11b, so can reduce the clearance between plug bush linkage segment 122 and the outer layer body 11b, be favorable to flexible seal 13 and outer layer body 11b to realize sealedly on the one hand, on the other hand can avoid plug bush 12 because of too big and the problem that leads to sealing failure in the beat appears with the clearance between the outer layer body 11 b.

In some embodiments of the present disclosure, a first groove 1221 is disposed at an end of the sleeve connecting section 122 connected to the main body section 131, the main body section 131 is fixedly connected in the first groove 1221 by a screw 16, a gasket is further disposed between the main body section 131 and the screw 16, the outer wall of the main body section 131 is tightly attached to the groove wall of the first groove 1221 by glue to realize sealing connection, and a gap between the screw 16 and the main body section 131 and the sleeve connecting section 122 can also be sealed by glue. By the arrangement, the connecting contact area between the main body section 131 and the sleeve connecting section 122 can be increased, the connection reliability and the connection tightness between the main body section 131 and the sleeve connecting section 122 are increased, and air leakage in a gap between the main body section 131 and the sleeve connecting section 122 is avoided. The inner cavity 134 communicated with the outer cavity 133 is arranged in the main body section 131, when the gas pressure in the inner cavity 134 is increased, the gas pressure in the inner cavity 134 applies a force towards the inner wall of the outer tube 11b to the inner wall of the main body section 131, so that the gap between the outer wall of the plug sleeve connecting section 122 and the inner wall of the outer tube 11b can be reduced, and sealing is facilitated. In an alternative embodiment, the first groove 1221 may not be disposed at one end of the sleeve connecting section 122, and the main body section 131 of the flexible sealing member 13 is directly and fixedly connected to the end surface of the sleeve connecting section 122 facing the corresponding buffer cavity 14 through the screw 16, and the main body section 131 of the flexible sealing member 13 may also have a solid structure without the inner cavity 134.

In some implementations of this embodiment, the outer wall of sleeve seal segment 121 is sealingly connected to the inner wall of inner tube 11a by glue; the sleeve sealing section 121 is provided with a second groove 1211, and an opening of the second groove 1211 is arranged opposite to the buffer cavity 14.

Because the upper end cavity of the sleeve sealing section 121 is communicated with the buffer cavity 14 of the inner layer pipe body 11, the leakage problem of the buffer cavity 14 positioned above can be avoided in a mode that the outer wall of the sleeve sealing section 121 is in sealing connection with the inner layer pipe body 11 a; and the second groove 1211 is disposed on the sleeve sealing section 121, when the air pressure in the buffer chamber 14 above increases, the air pressure in the second groove 1211 also increases, at this time, the air pressure in the second groove 1211 applies a force to the inner wall of the sleeve sealing section 121 toward the inner wall of the inner layer tube 11a, and the force makes the fit between the outer wall of the sleeve sealing section 121 and the inner wall of the inner layer tube 11a tighter, and the tightness is better.

In this embodiment, the outer tube 11b is provided with a locking member 17 for locking the inner tube 11a to the outer tube 11b, and after the height of the inner tube 11a is adjusted in place, the inner tube 11a and the outer tube 11b can be locked by the locking member 3, so that the support member on the support tube 1 is stably maintained at a desired height.

In this embodiment, the support tube 1 includes three layers of tube bodies 11 sequentially sleeved from inside to outside, and a pneumatic buffer structure and a locking member 17 are disposed between any two adjacent layers of tube bodies 11. With this arrangement, the individual falling buffer and locking of any one layer pipe body 11 can be realized.

In summary, according to the telescopic support tube and the support foot stool provided by the embodiments of the present utility model, by arranging the pneumatic buffer structure between any two tube bodies 11, when the weight of the support member supported by the support tube 1 is light, the tube body 11 will slowly descend under the action of air pressure; when the weight of the supporting member supported by the supporting pipe 1 is large and the falling speed of the pipe body 11 is high, the air pressure can be quickly and automatically adapted and become large, thereby playing a role of buffering. Moreover, because of the air pressure buffering, the weight of the supporting component can be automatically adapted to generate corresponding air pressure for balancing the falling impact force, rebound can not be generated, and the supporting component supported on the supporting tube 1 can be effectively protected.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims (14)

1. The telescopic support tube is characterized by comprising at least two layers of tube bodies (11) which are sleeved in sequence from inside to outside and can axially stretch, and a pneumatic buffer structure connected between the adjacent two layers of tube bodies (11); the pneumatic buffer structure comprises a plug bush (12) which is connected onto an inner layer pipe body (11 a) in an adjacent two-layer pipe body (11) in a sealing manner and a flexible sealing piece (13) which is fixedly connected with one end of the plug bush (12), wherein a buffer cavity (14) is formed by enclosing the flexible sealing piece (13) and an outer layer pipe body (11 b) in the adjacent two-layer pipe body (11), and an exhaust hole (15) which is communicated with the buffer cavity (14) and external air is formed in the pipe wall of the outer layer pipe body (11 b); when the inner layer pipe body (11 a) is contracted inwards towards the outer layer pipe body (11 b), the flexible sealing piece (13) is sealed with the inner wall of the outer layer pipe body (11 b); when the inner layer pipe body (11 a) extends out of the outer layer pipe body (11 b), the flexible sealing element (13) is not sealed with the inner wall of the outer layer pipe body (11 b).

2. A telescopic support tube according to claim 1, wherein the diameter of the exhaust hole (15) is 0.5-1.0mm.

3. A telescopic support tube according to claim 1 or 2, characterized in that the flexible seal (13) is internally provided with an outer cavity (133) communicating with the buffer chamber (14), the opening of the outer cavity (133) being arranged towards the buffer chamber (14); when the gas pressure in the outer cavity (133) increases, the gas pressure acts on the inner wall of the portion of the flexible seal member (13) corresponding to the outer cavity (133) to seal the outer wall of the flexible seal member (13) with the inner wall of the outer tube body (11 b).

4. A telescopic support tube according to claim 3, wherein the flexible sealing member (13) comprises a body section (131) and a flexible sealing section (132) which are integrally connected, the body section (131) is fixedly connected with the sleeve (12), the outer diameter of the flexible sealing section (132) is larger than the outer diameter of the body section (131), and the outer cavity (133) is arranged in the flexible sealing section (132).

5. The telescopic support tube according to claim 4, wherein the outer diameter of the flexible sealing section (132) increases gradually in the direction from the flexible seal (13) to the buffer chamber (14).

6. The telescopic support tube according to claim 4, wherein the sleeve (12) comprises a sleeve sealing section (121) and a sleeve connecting section (122) which are integrally connected, the outer wall of the sleeve sealing section (121) is in sealing connection with the inner wall of the inner tube body (11 a), the outer diameter of the sleeve connecting section (122) is larger than the outer diameter of the sleeve sealing section (121), the outer wall of the sleeve connecting section (122) is attached to the inner wall of the outer tube body (11 b), and the main body section (131) of the flexible sealing member (13) is connected to the sleeve connecting section (122).

7. The telescopic support tube according to claim 6, wherein a first groove (1221) is provided at the end of the sleeve connection section (122) connected to the main body section (131), the main body section (131) is fixedly connected to the first groove (1221), the outer wall of the main body section (131) is attached to the groove wall of the first groove (1221), an inner cavity (134) communicating with the outer cavity (133) is provided in the main body section (131), and when the gas pressure in the inner cavity (134) increases, the gas pressure acts on the inner wall of the main body section (131) to make the outer wall of the sleeve connection section (122) tightly attached to the inner wall of the outer layer tube (11 b).

8. The telescopic support tube according to claim 6, wherein the main body section (131) is fixedly connected to the sleeve connection section (122) by means of screws (16).

9. The telescopic support tube according to claim 6, wherein the outer wall of the flexible sealing member (13) is in sealing connection with the sleeve connection section (122) by means of glue, and the outer wall of the sleeve sealing section (121) is in sealing connection with the inner wall of the inner tube body (11 a) by means of glue.

10. The telescopic support tube according to claim 6, characterized in that a second groove (1211) is provided in the sleeve sealing section (121), the opening of the second groove (1211) being arranged facing away from the buffer chamber (14).

11. A telescopic support tube according to claim 1, wherein the outer tube body (11 b) is further provided with locking means (17) for locking the inner tube body (11 a) to the outer tube body (11 b).

12. A telescopic support tube according to claim 11, wherein the pneumatic cushioning structure and locking member (17) are provided between any two adjacent layers of the tube body (11).

13. A telescopic support tube according to claim 1, further comprising a top sealing seat (18) connected to the top of the innermost tube body (11) and a bottom sealing seat (19) sealingly connected to the bottom of the outermost tube body (11), said top sealing seat (18) being provided with a connecting post (181) adapted to mount a supported component.

14. A support foot stand comprising a foot stand (2) and a telescopic support tube according to any one of claims 1 to 13 supported by the foot stand (2).