Walking stick capable of stably extending

Abstract

The invention provides a walking stick capable of stably extending, which relates to the field of medical instruments and comprises an outer supporting tube, an inner telescopic tube and an inflating device, the inflating device comprises an expandable air bag and an inflating assembly; a tubular containing cavity is formed in the outer supporting pipe. The air bag is fixed at the bottom of the tubular cavity; a sliding block is fixed in the outer supporting pipe in a sliding mode. A through hole is formed in the center of the sliding block; the airbag is fixed below the slide block; the bottom of the inner telescopic pipe is fixed to the upper side of the sliding block. The inflation assembly comprises a pressing piston rod and an inflation cylinder. The inflator pump is vertically fixed in the hollow cavity of the inner telescopic pipe; an air outlet of the inflator pump penetrates through the through hole and is communicated with the airbag; the pressing piston rod is adaptively fixed in the inflator pump; the upper end of the pressing piston rod extends out of the inner telescopic pipe. According to the walking stick capable of stably extending, the problem that in the prior art, an automatic telescopic walking stick is prone to contracting when supporting a person to stand up, so that the gravity center of the person is not stable is solved, and the supporting force provided by the walking stick can be more stable.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a stable elongation crutch. BACKGROUND

[0002] In the prior art, most of the elderly have difficulty in sitting and standing, but they can still perform normally in maintaining a sitting or standing posture and walking with the help of a crutch. In view of this problem, the existing solutions have many limitations: Some devices for assisting the elderly to stand up and sit down are chair-type rehabilitation devices (such as the rehabilitation training device disclosed in Chinese Patent Application No. 202110538553.2), which can provide assistance but are difficult to carry due to size and structural limitations, resulting in the elderly being able to move only near the device after standing up with the help of the device, and being unable to independently complete the action of sitting down and standing up again once they are away from the device, which severely limits the range of activities.

[0003] Traditional devices for assisting standing are mainly crutches, but there are obvious defects: the lower support point of the traditional crutch is fixed in position, and the elderly in a sitting position have difficulty directly grasping the top of the crutch, and need to repeatedly switch the grasping position to complete the standing action, which is extremely difficult for the elderly with weak limb coordination.

[0004] Due to reduced activity (such as prolonged sitting and less walking), the lack of sustained load stimulation of leg muscles can easily cause sarcopenia, leading to leg weakness, while the hands are continuously exercised to perform daily actions such as picking up chopsticks and holding a cup, and the muscle strength is retained for a longer period; therefore, an ideal assistive device should be able to assist standing up with the help of hand power, and the existing assistive sitting-up crutch disclosed in Chinese Patent Application No. 202010101251.4 relies on the pressure generated by the body weight of the person to achieve shortening, and can only assist in sitting down, and cannot provide support for the standing-up process by actively elongating, and when using this crutch, the standing-up process still requires the continuous power of the elderly's legs, and the support force provided by the crutch will also change in different elongation states (because the air pressure in the gas-filled column and all the air springs will decrease due to the inflation of the air springs, and the smaller the air pressure, the smaller the push force of the air spring on the telescopic support mechanism, and the support force will weaken), when the elderly stand up with the help of the crutch, if the elderly cannot stably exert force due to leg weakness, the elderly will unconsciously apply all their weight to the crutch, at which point the crutch is prone to contraction, resulting in a loss of support, and the sudden contraction of the crutch causes the elderly to lose their balance, which in turn increases the risk of falling. SUMMARY

[0005] To solve the above technical problems, the stable elongation crutch provided by the present application can make the telescopic crutch more stable when elongated.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present application is: The application provides a stable and extendable walking stick, which comprises an outer supporting tube, an inner telescopic tube and an inflation device, the inflation device comprises an inflatable air bag, an inflation assembly and a manual deflation assembly, the inner of the outer supporting tube is provided with a tubular cavity, the air bag is fixed to the bottom of the tubular cavity, the inner telescopic tube is coaxially and slidably fixed in the tubular cavity, the tube axis of the tubular cavity is vertical, the inner of the outer supporting tube is slidably fixed with a sliding block, the center of the sliding block is provided with a through hole, the air bag is fixed to the lower side of the sliding block, the sliding block is at different heights in the tubular cavity in different inflation states of the air bag, the bottom of the inner telescopic tube is fixed to the upper side of the sliding block, the inner telescopic tube surrounds the outer periphery of the through hole, the inflation assembly comprises a pressing piston rod and an inflation cylinder, the inflation cylinder is vertically fixed in the hollow cavity of the inner telescopic tube, the air outlet of the inflation cylinder communicates with the air bag through the through hole, the pressing piston rod is adaptively fixed in the inflation cylinder, the upper end of the pressing piston rod extends to the outside of the inner telescopic tube, the manual deflation assembly comprises a deflation valve and an air outlet pipe, the air outlet pipe penetrates the outer supporting tube, the air outlet pipe communicates the air bag and the deflation valve, and the deflation valve is installed on the top outer wall of the outer supporting tube.

[0007] The application provides a stable and extendable walking stick, preferably, the inner wall of the tubular cavity is provided with a ratchet track, the ratchet track comprises a plurality of stoppers, the stoppers are fixed to the inner wall of the tubular cavity, the lower side of the stopper is provided with an inner side surface which is inclined to the axis of the tubular cavity, the sliding block comprises a sliding block body and a plurality of movable blocks, the inner telescopic tube is fixed to the sliding block body, the inner telescopic tube is rotatably fixed in the outer supporting tube, the side edge of the sliding block body is provided with a plurality of accommodating holes, the hole axis of the accommodating hole is horizontal, the sliding block body is cylindrical, the hole axes of the accommodating holes intersect with the cylindrical axis of the sliding block body, the movable blocks are slidably fixed in the accommodating holes through springs, the extension direction of the spring is consistent with the hole axis of the accommodating hole, the movable blocks can slide along the hole axis of the accommodating hole, the movable blocks extend to the outside of the accommodating hole in the natural extension state of the spring, the movable blocks can be completely on the inside of the accommodating hole in the compression state of the spring, the lower side of the movable block is a plane, the upper side of the movable block is matched with the shape of the chamfer of the stopper, the inner telescopic tube has a blocking state and a passing state in the rotating state compared with the outer supporting tube, in the blocking state, the stopper can block the vertical downward movement of the movable block, and the movable block can normally vertically pass upward, in the passing state, the movable block can normally vertically pass upward and downward.

[0008] The stable and extendable walking stick provided by the application, preferably, the inner telescopic tube is a hollow tube structure with an open top; the outer wall of the inner telescopic tube extends radially with a handle; the upper end of the pressing piston rod extends above the open top of the inner telescopic tube.

[0009] The stable and extendable walking stick provided by the application, preferably, the air cylinder comprises an air inlet; the air inlet is provided with a one-way air inlet valve; the one-way air inlet valve only allows external air to enter the inside of the air cylinder; the air outlet of the air cylinder is provided with a one-way air outlet valve; the one-way air outlet valve only allows air in the air cylinder to enter the air bag.

[0010] The stable and extendable walking stick provided by the application, preferably, the inner wall of the tubular cavity of the outer support tube is provided with two guide grooves in the axial direction; the guide grooves are arranged above the ratchet tracks; the outer wall of the inner telescopic tube is provided with a plurality of protrusions matched with the guide grooves; the protrusions can move along the extension direction of the guide grooves; the inner wall of the tubular cavity of the outer support tube is further provided with two circular arc guide grooves; the circular arc guide grooves are arranged at the two ends of the guide grooves; the circular arc guide grooves are connected with the two guide grooves; the protrusions can switch the guide grooves through the circular arc guide grooves; when the protrusions are in two different guide grooves, the inner telescopic tube is in a blocked state and a passing state, respectively.

[0011] The stable and extendable walking stick provided by the application, preferably, the outer wall of the pressing piston rod extends radially with a pulling handle; the top of the inner telescopic tube is provided with a side wall slot for the pulling handle to pass vertically.

[0012] The above technical solution has the following advantages or beneficial effects: The application provides a stable elongated walking stick and relates to the field of medical devices, which comprises an outer supporting tube, an inner telescopic tube and an inflation device; the inflation device comprises an inflatable air bag, an inflation assembly and a manual deflation assembly; the inner part of the outer supporting tube is provided with a tubular cavity; the air bag is fixed to the bottom of the tubular cavity; the inner telescopic tube is coaxially and slidably fixed in the tubular cavity; the tube shaft of the tubular cavity is vertical; a sliding block is slidably fixed in the outer supporting tube; a through hole is formed in the center of the sliding block; the air bag is fixed to the lower side of the sliding block; the sliding block is at different heights in the tubular cavity in different inflation states of the air bag; the bottom of the inner telescopic tube is fixed to the upper side of the sliding block; the inner telescopic tube surrounds the outer periphery of the through hole; the inflation assembly comprises a pressing piston rod and an inflation cylinder; the inflation cylinder is vertically fixed in the hollow cavity of the inner telescopic tube; the air outlet of the inflation cylinder communicates with the air bag through the through hole; the pressing piston rod is adaptively fixed in the inflation cylinder; the upper end of the pressing piston rod extends to the outside of the inner telescopic tube; the manual deflation assembly comprises a deflation valve and an air outlet pipe; the air outlet pipe penetrates the outer supporting tube; the air outlet pipe communicates the air bag and the deflation valve; the deflation valve is installed on the top outer wall of the outer supporting tube. The stable elongated walking stick provided by the application solves the problem that the automatic telescopic walking stick in the prior art is prone to contraction when supporting a person to stand up, which makes the center of gravity of the person unstable, and can make the support force provided by the walking stick more stable. BRIEF DESCRIPTION OF DRAWINGS

[0013] The present application and its features, shapes and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. The same reference numbers in all the drawings indicate the same parts. The drawings are not necessarily drawn to scale, the emphasis being on illustrating the principle of the application.

[0014] Fig. 1 is the overall structure schematic diagram of the stable elongated walking stick provided by the embodiment 1 of the application.

[0015] Fig. 2 is the structure schematic diagram of the inner telescopic tube provided with a slotted side wall of the stable elongated walking stick provided by the embodiment 1 of the application.

[0016] Fig. 3 is the sectional structure schematic diagram of the position relationship between the protruding block and the guide groove of the stable elongated walking stick provided by the embodiment 1 of the application.

[0017] Fig. 4 is the sectional structure schematic diagram of the position relationship between the sliding block and the stop block of the stable elongated walking stick provided by the embodiment 1 of the application.

[0018] Fig. 5 is the structure schematic diagram of the manual deflation assembly of the stable elongated walking stick provided by the embodiment 1 of the application.

[0019] Fig. 6 This is a schematic diagram of the slider structure of the cane that can be stably extended, provided in Embodiment 1 of the present invention. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. It should also be noted that the terminology used in this invention is for describing specific implementations only and is not intended to limit the exemplary implementations according to this application.

[0021] The technical solutions of the embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the protection scope of the present invention.

[0022] Example 1: The stably extendable cane provided in Embodiment 1 of the present invention, such as... Figs. 1 to 6 As shown, it includes an outer support tube 1, an inner telescopic tube 2, and an inflation device 3; the inflation device 3 includes an inflatable airbag 31, an inflation assembly 32, and a manual deflation assembly; the outer support tube 1 has a tubular cavity 11 inside; the airbag 31 is fixed to the bottom of the tubular cavity 11; the inner telescopic tube 2 is coaxially and slidably fixed inside the tubular cavity 11; the tube axis of the tubular cavity 11 is vertical; a slider 4 is slidably fixed inside the outer support tube 1; a through hole 41 is opened in the center of the slider 4; the airbag 31 is fixed to the lower side of the slider 4; the slider 4 is at different heights inside the tubular cavity 11 when the airbag 31 is in different inflation states; the bottom of the inner telescopic tube 2 is fixed to the slider 4. On the upper side of block 4; the inner telescopic tube 2 surrounds the outer periphery of the through hole 41; the inflation assembly 32 includes a pressing piston rod 321 and an inflation cylinder 322; the inflation cylinder 322 is vertically fixed in the hollow cavity of the inner telescopic tube 2; the air outlet of the inflation cylinder 322 passes through the through hole 41 and communicates with the airbag 31; the pressing piston rod 321 is adapted and fixed inside the inflation cylinder 322; the upper end of the pressing piston rod 321 extends to the outside of the inner telescopic tube 2; the manual deflation assembly includes a deflation valve 331 and an air outlet pipe 332; the air outlet pipe 332 passes through the outer support tube 1; the air outlet pipe 332 connects the airbag 31 and the deflation valve 331; the deflation valve 331 is installed on the top outer wall of the outer support tube 1.

[0023] The stable lengthening crutch provided by the embodiment 1 of the present application is used, specifically, when the user needs to stand up by using the device provided by the embodiment, at this time, the crutch is in the retracted state, the user holds one hand on the inner telescopic tube 2 (the handle 21), and the other hand on the pressing piston rod 321, and through the vertical up and down movement of the pressing piston rod 321, the air bag 31 in the outer supporting tube 1 is inflated by the air pump 322 (the specific structure of the air pump 322 is the prior art, and the common bicycle tire pump can be used as the air pump of the embodiment, and details are not described here), so as to continuously increase the amount of gas in the air bag 31, the air bag 31 is inflated to lift the sliding block 4, the sliding block 4 is vertically moved upward, the inner telescopic tube 2 is vertically moved upward, so that the crutch is lengthened (the distance between the upper end of the inner telescopic tube 2 and the lower end of the outer supporting tube 1 is lengthened); the difference from the prior art telescopic crutch is that the device provided by the embodiment is used to continuously inflate the air bag in the crutch by using the air pump 322, so that the air pressure in the air bag can be continuously increased by inflation, and the problem that the internal air pressure becomes smaller due to the expansion of the air bag does not occur, so that the structure provided by the embodiment can always maintain sufficient air pressure to provide more stable support, thereby avoiding the crutch from retracting due to the decrease of the air pressure of the air bag during the standing up process by using the crutch, and avoiding the situation of falling down due to the instability of the center of gravity caused by the abnormal retraction of the crutch.

[0024] The stable lengthening crutch provided by the embodiment can solve the problem that the automatic telescopic crutch in the prior art is easy to retract when supporting a person to stand up, so that the center of gravity of the person is unstable, and can make the support provided by the crutch more stable.

[0025] To further improve the stability of the crutch in the process of lifting, as a preferred way, in the embodiment, the inner wall of the tubular cavity 11 is provided with a ratchet track; the ratchet track includes a plurality of stoppers 111; the stoppers 111 are fixed on the inner wall of the tubular cavity 11; a chamfer is arranged between the lower side of the stopper 111 and the inner side facing the axis of the tubular cavity; the sliding block 4 includes a sliding block body 42 and a plurality of movable blocks 43; the inner telescopic pipe 2 is fixed on the sliding block body 42; the inner telescopic pipe 2 is rotatably fixed in the outer supporting pipe 1; a plurality of accommodating holes 421 are formed in the side edge of the sliding block body 42; the hole axis of the accommodating hole 421 is horizontal; the sliding block body 42 is cylindrical; the hole axes of the accommodating holes 421 converge at the cylindrical axis of the sliding block body 42; the movable block 43 is slidably fixed in the accommodating hole 421 by a spring; the extension direction of the spring is consistent with the hole extension direction of the accommodating hole 421; the movable block 43 can slide along the extension direction of the accommodating hole 421; in the natural extension state of the spring, the movable block 43 extends to the outside of the accommodating hole 421; in the compressed state of the spring, the movable block 43 can be completely on the inside of the accommodating hole 421; the lower side of the movable block 43 is a plane; the upper side of the movable block 43 matches the shape of the chamfer of the stopper 111; in the rotating state of the inner telescopic pipe 2 relative to the outer supporting pipe 1, there are a blocking state and a passing state; in the blocking state, the stopper 111 can block the movable block 43 from moving vertically downward; the movable block 43 can normally pass vertically upward; in the passing state, the movable block 43 can normally pass vertically upward and downward.

[0026] For the above-mentioned blocking state and passing state: when the inner telescopic pipe 2 rotates relative to the outer supporting pipe 1 to the blocking state: the movable block 43 extends out of the accommodating hole 421, and the position of the movable block 43 corresponds to the stopper 111 of the ratchet track; when moving upward: the upper side of the movable block 43 (which matches the chamfer of the stopper 111) slides along the chamfer inclined surface of the stopper 111, the spring is compressed and withdrawn into the accommodating hole 421, and the sliding block 4 can smoothly pass through the stopper 111 to continue moving upward; when moving downward: the lower side of the movable block 43 is a plane, directly contacting the upper horizontal surface of the stopper 111, the movable block 43 cannot be compressed and withdrawn (the spring is in a natural extension state at this time), so the stopper 111 blocks the movable block 43 from moving downward, thereby limiting the sliding block 4 and the inner telescopic pipe 2 from moving downward as a whole.

[0027] When the inner telescopic pipe 2 rotates relative to the outer supporting pipe 1 to the passing state: after the movable block 43 rotates with the sliding block, its position is misaligned with the stopper 111 of the ratchet track; when moving upward and downward, the movable block 43 no longer contacts the stopper 111, so the sliding block 4 and the inner telescopic pipe 2 can freely move upward and downward.

[0028] In order to facilitate the user to hold the walking stick, in the embodiment, the inner telescopic tube 2 is a hollow tube structure with a top opening; the outer wall of the inner telescopic tube 2 extends radially with a handle 21; the upper end of the pressing piston rod 321 extends above the top opening of the inner telescopic tube 2. The handle 21 extends radially on the outer wall of the top of the inner telescopic tube 2 extending out of the outer support tube 1, which can achieve a larger gripping area for the user to hold, and on the other hand, can limit the inner telescopic tube 2 from falling completely into the outer support tube; in addition, the preferred handle 21 of the embodiment also extends upward, and the handle of the handle 21 is vertically above the tube axis of the inner telescopic tube 2, which can facilitate the user to adjust the center of gravity of the force to above the tube axis of the inner telescopic tube 2; in actual use (in the blocked state), the ground exerts an upward supporting force on the outer support tube 1, the stopper 111 in the outer support tube 1 exerts a vertically upward supporting force on the sliding block 4, the sliding block 4 exerts a supporting force on the inner telescopic tube 2 fixed above it, and the handle 21 above the inner telescopic tube 2 exerts a supporting force on the user; under this structure, in order to avoid the handle part of the handle 21 blocking the vertical upward movement of the pressing piston rod 321, a slot needs to be opened on the side wall of the inner telescopic tube 2, and a pulling handle is also radially extended above the pressing piston rod 321, the pulling handle can move up and down through the slot in the side wall of the inner telescopic tube 2, and the slot in the side wall ensures the travel distance of the pressing piston rod 321 in the vertical direction under the condition that the handle 21 has a handle above it, ensuring that the air cylinder 322 can work normally; the pulling handle and the handle 21 are staggered with each other, which is used to avoid the user's hands overlapping and unable to normally vertically move the pressing piston rod 321.

[0029] As a preferred solution, in the embodiment, the air cylinder 322 includes an air inlet; a one-way air inlet valve 5 is arranged at the air inlet; the one-way air inlet valve 5 only allows external air to enter the inside of the air cylinder 322; a one-way air outlet valve 6 is arranged at the air outlet of the air cylinder 322; the one-way air outlet valve 6 only allows the air in the air cylinder 322 to enter the air bag 31. In the embodiment, the one-way air inlet valve 5 is arranged at the air inlet of the air cylinder 322, when the pressing piston rod 321 moves vertically, the gas enters the air cylinder 322 from the one-way air inlet valve 5, and then enters the air bag 31 from the one-way air outlet valve 6, avoiding the gas in the air bag 31 flowing out from the air cylinder 322 in the opposite direction during the inflation process.

[0030] To avoid rotation of the inner telescopic tube 2 relative to the outer support tube 1 when vertically moving, so that the stopper 111 cannot normally block the slider 4, in the embodiment, the inner wall of the tubular cavity of the outer support tube 1 is provided with two guide grooves 12 in the axial direction; the guide grooves 12 are arranged above the ratchet track; the outer wall of the inner telescopic tube 2 is provided with a plurality of protrusions 22 matched with the guide grooves; the protrusions 22 can move along the extension direction of the guide grooves 12; the inner wall of the tubular cavity of the outer support tube 1 is also provided with two circular arc guide grooves 13; the circular arc guide grooves 13 are arranged at both ends of the guide grooves 12; the circular arc guide grooves 13 communicate the two guide grooves 12; the protrusions 22 can switch the guide grooves 12 through the circular arc guide grooves 13; when the protrusions 22 are in two different guide grooves 12, the inner telescopic tube is in a blocking state and a passing state, respectively. The inner wall of the tubular cavity of the outer support tube 1 is provided with two guide grooves 12 in the axial direction, and the guide grooves 12 are located above the ratchet track; at the same time, the inner wall of the tubular cavity 11 is also provided with two circular arc guide grooves 13 for communicating the two guide grooves 12 (only used when switching states); the outer wall of the inner telescopic tube 2 is provided with a plurality of protrusions 22 matched with the guide grooves 12, and the protrusions 22 can slide along the extension direction of the guide grooves 12; when the inner telescopic tube 2 vertically moves, the protrusions 22 are embedded in the guide grooves 12, and since the guide grooves 12 extend in the axial direction, the groove wall will form a radial constraint on the protrusions 22, preventing the protrusions 22 from rotating around the tube axis; the protrusions 22 are extension structures of the inner telescopic tube 2, so when the rotation of the protrusions 22 is limited, the rotation of the inner telescopic tube 2 is also synchronously limited, ensuring that the inner telescopic tube 2 can only slide in the vertical direction and cannot rotate during movement. In the embodiment, the outer wall of the inner telescopic tube 2 is provided with protrusions 22, and in the stage of lifting with the aid of the air bag 31, the protrusions 22 are in the vertically extended guide grooves 12, and the guide grooves 12 can limit the sliding direction of the protrusions 22, thereby avoiding the rotation of the inner telescopic tube 2 relative to the outer support tube 1; until the crutch is elongated to the longest, the user can rotate the inner telescopic tube 2, so that the protrusions 22 enter another guide groove 12 along the circular arc guide groove 13; at this time, the user opens the air release valve 331, and the gas in the air bag 31 continuously flows out of the air release valve 331 from the air outlet tube 332, the supporting force of the air bag 31 on the inner telescopic tube 2 decreases, and the inner telescopic tube 2 slowly vertically moves downward until the slider 4 moves to the lowermost end (i.e. the protrusions 22 move to the circular arc guide groove 13 below the outer support tube 1), and then the user can rotate the inner telescopic tube 2 to adjust the protrusions 22 to switch to alignment with the guide grooves 12, so that the slider 4 below the inner telescopic tube 2 can be rotated to the state of being blocked by the stopper 111 from vertically moving downward.The preferred air outlet pipe 332 of the embodiment is embedded in the inside of the outer supporting pipe 1, and is an air passage in the outer supporting pipe 1. One end of the air outlet pipe 332 is in communication with the bottom of the air bag 31 (the bottom of the air bag 31 is fixed to the bottom of the outer supporting pipe 1, and when the air bag 31 is inflated, the upper part of the air bag 31 expands and moves up and down, and the lower part of the air bag 31 does not change in position). The other end of the air outlet pipe 332 is along the axis of the outer supporting pipe 1 to the top of the outer supporting pipe 1, and the top of the outer supporting pipe 1 is convenient for a user to contact in the extended state of the walking stick, so that the user can conveniently operate the deflation valve 331 arranged at the top of the air outlet pipe 332.

[0031] In summary, the present application provides a stable and extendable walking stick, which belongs to the field of medical devices and comprises an outer supporting pipe, an inner telescopic pipe and an inflation device. The inflation device comprises an inflatable air bag, an inflation assembly and a manual deflation assembly. The outer supporting pipe is internally provided with a tubular cavity. The air bag is fixed to the bottom of the tubular cavity. The inner telescopic pipe is coaxially and slidably fixed in the tubular cavity. The tube axis of the tubular cavity is vertical. A sliding block is slidably fixed in the outer supporting pipe. A through hole is formed in the center of the sliding block. The air bag is fixed to the lower side of the sliding block. The sliding block is at different heights in the tubular cavity in different inflation states of the air bag. The bottom of the inner telescopic pipe is fixed to the upper side of the sliding block. The inner telescopic pipe surrounds the outer periphery of the through hole. The inflation assembly comprises a pressing piston rod and an inflation cylinder. The inflation cylinder is vertically fixed in the hollow cavity of the inner telescopic pipe. The air outlet of the inflation cylinder communicates with the air bag through the through hole. The pressing piston rod is adaptively fixed in the inflation cylinder. The upper end of the pressing piston rod extends to the outside of the inner telescopic pipe. The manual deflation assembly comprises a deflation valve and an air outlet pipe. The air outlet pipe penetrates the outer supporting pipe. The air outlet pipe communicates the air bag and the deflation valve. The deflation valve is installed on the top outer wall of the outer supporting pipe. The stable and extendable walking stick provided by the present application solves the problem that the automatic telescopic walking stick in the prior art is prone to contraction when supporting a person to stand up, which makes the center of gravity unstable. The support force provided by the walking stick is more stable.

[0032] The above description is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A stable extendable walking stick, characterized in that, The outer support tube, the inner telescopic tube and the inflating device are included. The inflating device includes an inflatable air bag, an inflating assembly and a manual deflating assembly. The outer support tube is internally provided with a tubular cavity, and the air bag is fixed to the bottom of the tubular cavity. The inner telescopic tube is coaxially and slidably fixed in the tubular cavity. The tube axis of the tubular cavity is vertical. A sliding block is slidably fixed in the outer support tube. A through hole is formed in the center of the sliding block. The air bag is fixed to the lower side of the sliding block. The sliding block is at different heights in the tubular cavity in different inflation states of the air bag. The bottom of the inner telescopic tube is fixed to the upper side of the sliding block, and the inner telescopic tube surrounds the outer periphery of the through hole. The inflating assembly includes a pressing piston rod and an inflating cylinder. The inflating cylinder is vertically fixed in the hollow cavity of the inner telescopic tube. The air outlet of the inflating cylinder communicates with the air bag through the through hole. The pressing piston rod is adaptively fixed in the inflating cylinder. The upper end of the pressing piston rod extends out of the inner telescopic tube. The manual deflating assembly includes a deflating valve and an air outlet pipe. The air outlet pipe penetrates the outer support tube.

3. The stable elongatable walking stick of claim 1, wherein, The air outlet pipe communicates the air bag and the deflating valve. The deflating valve is installed on the top outer wall of the outer support tube.

2. The stable and extendable walking stick according to claim 1, wherein A ratchet track is arranged on the inner wall of the tubular cavity. The ratchet track includes a plurality of stoppers. The lower side of the stopper is provided with an inner side surface facing the tube axis. The sliding block includes a sliding block body and a plurality of movable blocks. The inner telescopic tube is rotatably fixed in the outer support tube. The side edge of the sliding block body is provided with a plurality of accommodating holes. The hole axis of the accommodating hole is horizontal. The sliding block body is cylindrical. The hole axes of the accommodating holes converge at the cylindrical axis of the sliding block body. The movable blocks are slidably fixed in the accommodating holes through springs. The spring is in the natural elongation state. The movable blocks extend out of the accommodating holes. The movable blocks are completely on the inner side of the accommodating holes. The lower side of the movable block is a plane. The upper side of the movable block matches the shape of the chamfer of the stopper. The inner telescopic tube has a blocking state and a passing state in the rotating state compared with the outer support tube. In the blocking state, the stopper can block the movable block from moving vertically downward. In the passing state, the movable block can normally pass vertically upward and downward. The inner telescopic tube is a hollow tubular structure with an open top. The outer wall of the inner telescopic tube radially extends a handle. The upper end of the pressing piston rod extends above the open top of the inner telescopic tube.

4. The stable elongatable walking stick of claim 1, wherein, The air cylinder comprises an air inlet; a one-way air inlet valve is arranged at the air inlet; the one-way air inlet valve only allows outside air to enter the inside of the air cylinder; a one-way air outlet valve is arranged at the air outlet of the air cylinder; the one-way air outlet valve only allows air in the air cylinder to enter the air bag.

5. The stable elongatable walking stick of claim 2, wherein, Two guide grooves are arranged on the inner wall of the tubular cavity of the outer support tube in the axial direction; The guide grooves are arranged above the ratchet tracks; The outer wall of the inner telescopic tube is provided with a plurality of protrusions matched with the guide grooves; The protrusions can move along the extension direction of the guide grooves; Two arc guide grooves are further arranged on the inner wall of the tubular cavity of the outer support tube; The arc guide grooves are arranged at the two ends of the guide grooves; The arc guide grooves are connected with the two guide grooves; the protrusions can switch the guide grooves through the arc guide grooves; when the protrusions are in the two different guide grooves, the inner telescopic tube is in the blocked state and the passing state, respectively.

6. The stable elongatable walking stick of claim 3, wherein, The outer wall of the pressing piston rod radially extends a pulling handle; the top of the inner telescopic tube is provided with a side wall slot for the pulling handle to vertically pass through.

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