Wheelchair brake structure applicable to multiple scenes

Abstract

The invention provides a wheelchair brake structure applicable to multiple scenes. The wheelchair brake structure comprises a turnover structure, a telescopic assembly, a locking mechanism and a reset assembly. The overturning structure is overturned up and down through an overturning connecting rod and a telescopic sleeve; the telescopic assembly comprises a telescopic rod and a foot pad and can stretch out and draw back in the telescopic sleeve in the axial direction. The locking mechanism locks the position of the telescopic rod through the fixed sleeve and the movable sleeve. The reset assembly provides force for elastically pressing the telescopic rod downwards. The wheelchair can adapt to the ground with multiple scenes such as inclination, unevenness or step change, it is ensured that the supporting legs are completely attached to the ground, the wheelchair is prevented from inclining, safety is improved, and user experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of brake rod structures, and in particular to a wheelchair brake structure applicable to multiple scenarios. Background Art

[0002] With the increasing trend of aging society and the development of technology, electric wheelchairs, as important personal mobility aids, play an increasingly important role in postoperative rehabilitation, daily activities of the elderly, and improving the quality of life of people with limited mobility. Electric wheelchairs can not only help users easily transfer positions, but also integrate a variety of intelligent functions to improve user experience and safety.

[0003] The electric wheelchairs currently on the market generally use motor drive and dynamic balancing technology to ensure the stability and safety of the wheelchair during movement. This design enables the wheelchair to maintain a stable movement state on different terrains by precisely controlling the speed and direction of the two main power wheels installed on the wheelchair base, thereby effectively reducing the bumpy feeling caused by uneven ground and improving riding comfort.

[0004] However, for electric wheelchairs, in addition to ensuring stability during movement, they also face the problem of how to ensure safety when the wheelchair stops. For this reason, many electric wheelchairs are designed with a hand-controlled brake structure to enhance stability when parking. Specifically, this type of brake structure usually includes a hand-pull brake lever located on one side of the seat. The user can manually operate the brake lever to make a pair of support feet pre-set under the wheelchair base flip downward and expand and contact the ground, thereby forming symmetrical and additional lateral support forces on the front and rear sides of the electric wheelchair to prevent the wheelchair from accidentally sliding.

[0005] Although the above braking mechanism can effectively keep the electric wheelchair stationary on a flat ground, it still faces some problems in practical application.

[0006] When encountering a complex ground environment with tilt, unevenness or steps, the traditional fixed support legs often cannot completely fit the ground because the lowest contact point after being lowered cannot be adjusted. This may not only cause the wheelchair to tilt slightly forward and backward, affecting the safety of the user, but also make it difficult for people with limited mobility to get on and off the wheelchair safely and conveniently.

[0007] In view of this, the inventor specially designed a wheelchair brake structure applicable to multiple scenarios, and this case was thus generated. Summary of the invention

[0008] In order to solve the above problems, the technical solution of the present invention is as follows: A wheelchair brake structure applicable to multiple scenarios, comprising: The flip structure comprises a flip connecting rod and a telescopic sleeve vertically fixed to one end of the flip connecting rod, the other end of the flip connecting rod is hinged on the base of the electric wheelchair, and is used to generate an upward or downward flipping action relative to the base when the brake lever of the electric wheelchair is pulled; The telescopic assembly comprises a telescopic rod and a foot pad arranged at the bottom of the telescopic rod, wherein the telescopic rod is slidably matched with the telescopic sleeve and can be telescoped along the axial direction of the telescopic sleeve; The locking mechanism is arranged at one end of the telescopic sleeve, and comprises a fixed sleeve connected to the telescopic sleeve, a movable sleeve rotatably connected to the fixed sleeve, and a driving device for driving the movable sleeve to rotate toward or away from the fixed sleeve. A clamping groove adapted to the telescopic rod is formed between the fixed sleeve and the movable sleeve, and the telescopic rod passes between the two clamping grooves. The reset assembly is arranged in the telescopic sleeve and is used for elastically pressing the telescopic rod downward so that the telescopic rod has a tendency to move downward.

[0009] Preferably, a telescopic cavity is provided in the telescopic sleeve along its axial direction, and guide holes are formed on the upper and lower sides of the telescopic cavity and penetrate to the outside along the axial direction of the fixed sleeve, and the diameter of the guide hole is smaller than the telescopic cavity. The telescopic rod passes through the telescopic cavity along the two guide holes and the telescopic rod has an annular limiting edge in the telescopic cavity, and the limiting edge is matched with the side wall clearance of the telescopic cavity. The limiting edge divides the telescopic cavity into an upper compression chamber and a lower compression chamber with variable volumes.

[0010] Preferably, it further comprises a three-way air valve, wherein two air outlets of the three-way air valve are respectively connected to the upper compression chamber and the lower compression chamber through air guide pipes.

[0011] Preferably, both of the air guide pipes are provided with air pressure sensors for reflecting the air pressure in the air guide pipes.

[0012] Preferably, sealing rings are provided in the two guide holes and on the outer peripheral side of the limiting edge.

[0013] Preferably, a return spring distributed axially along the telescopic sleeve is provided in the upper compression chamber, the return spring is sleeved on the outer peripheral side of the telescopic rod and its upper and lower ends are movably abutted against the upper bottom surface of the upper telescopic chamber and the upper end surface of the limit edge respectively.

[0014] Preferably, a connecting seat protrudes from one side of the fixed sleeve, and the connecting seat is vertically penetrated to form a first pivot hole. The movable sleeve has a pair of connecting parts symmetrically protruding from the same side of the connecting seat and located on the upper and lower sides thereof. The connecting parts are vertically penetrated to form a second pivot hole opposite to the first pivot hole. The first pivot hole and the second pivot hole are rotatably connected by inserting a rotating shaft.

[0015] Preferably, the fixing sleeve protrudes from one side away from the connecting seat to form a fixing seat, and the movable sleeve protrudes from the same side as the fixing seat to form a matching seat symmetrical to the fixing seat. The middle part of the fixing seat and the middle part of the matching seat respectively penetrate to form a first mounting groove and a second mounting groove which are opposite to each other. A bearing member is embedded in the first mounting groove, and a locking portion is embedded in the second mounting groove. The locking portion penetrates to form an internal threaded hole which is colinear with the rotation axis of the bearing member. The driving device is a micro motor, and the output shaft of the micro motor passes through the internal threaded hole along the side of the movable sleeve away from the fixed sleeve and is rotatably connected to the bearing member. The outer wall of the output shaft is provided with an external threaded section which is threadedly connected to the internal threaded hole.

[0016] Preferably, a first elastic buffer layer is provided between the bearing member and the first mounting groove and between the locking portion and the second mounting groove.

[0017] Preferably, the output side of the micro motor is provided with a second elastic buffer layer distributed around the output shaft.

[0018] The beneficial effects of the present invention are as follows: The present invention realizes a more flexible and adaptable braking function by separating the flip structure from the telescopic assembly. Specifically, in the unbraked state, the reset assembly places the telescopic assembly in the maximum stroke position. When the user operates the brake lever to flip the flip structure downward, the foot pad of the telescopic assembly first contacts the ground. As the flip structure continues to flip downward, the telescopic rod is dynamically adjusted in the telescopic sleeve to adapt to the downward flipping stroke of the flip structure. When the flip structure is completely flipped down into place, the telescopic rod reaches a suitable telescopic height. At this time, the locking assembly hugs the outer wall of the telescopic rod, fixes it relatively to the telescopic sleeve, and forms a stable limiting support structure.

[0019] Compared with traditional fixed support feet, the design of the present invention can better adapt to complex ground environments with inclinations, uneven surfaces or steps. Through the dynamic adjustment of the telescopic rod, the support feet are ensured to be completely in contact with the ground, avoiding the wheelchair from tilting slightly forward and backward, thereby significantly improving the safety of use. In addition, this design also helps users get on and off the wheelchair more safely and conveniently, greatly improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0021] in: Figure 1 It is a schematic diagram of the structure of the present invention in use state; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 It is a cross-sectional structural schematic diagram of the present invention; Figure 4 It is a partial structural schematic diagram of the locking mechanism in the present invention; Figure 5 It is one of the partial cross-sectional structural schematic diagrams of the locking mechanism in the present invention; Figure 6 This is the second partial cross-sectional structural schematic diagram highlighting the locking mechanism in the present invention; Figure 7 It is a block diagram of the connection principle of the present invention; Figure 8 It is a schematic diagram of the use process of the present invention.

[0022] Description of labels: 100, base; 101, main power wheel; 102, seat; 103, armrest assembly; 104, brake lever; 105, support foot; 200, flip structure; 201, flip connecting rod; 202, telescopic sleeve; 203, reinforcing rib; 204, rotating shaft sleeve; 300, telescopic assembly; 301, telescopic rod; 302, foot pad; 303, limit edge; 400, locking mechanism; 401, fixed sleeve; 402, movable sleeve; 403, driving device; 404, holding groove; 405, connecting seat; 406, first pivot hole; 407, connecting part; 408, second pivot hole; 409, friction sleeve; 410, friction strip; 411, fixing seat; 412, matching seat; 413, first mounting groove; 414, second mounting groove; 415, bearing member; 416, locking portion; 417, internal threaded hole; 418, external threaded section; 419, first elastic buffer pad layer; 420, second elastic buffer pad layer; 500, reset assembly; 600, telescopic chamber; 601, upper compression chamber; 602, lower compression chamber; 603, guide hole; 604, air guide interface; 700, sealing ring; 800, three-way air valve; 802, air guide pipeline; 803, air pressure sensor; 900, control module; 901, contact switch. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] As the prior art of this application, the general structure of an electric wheelchair is described as follows: like Figure 1As shown, the electric wheelchair generally includes a base 100, main power wheels 101 arranged on both sides of the base 100, a seat 102 arranged on the upper side of the base 100, an armrest assembly 103 arranged on the front side of the base 100 and extending to the front side of the seat 102, and corresponding electric drive components (not shown in the figure).

[0025] The existing electric wheelchair also includes a brake lever 104 rotatably arranged on one side of the seat 102 and a pair of supporting feet 105 symmetrically hinged on both sides of the middle part of the base 100 and cooperating with the brake lever 104. When the brake lever 104 is pulled, the supporting feet 105 rotate relative to the base 100, generating an upturned and downturned action, thereby realizing the braking state and the braking release state of the electric wheelchair.

[0026] The present invention mainly improves the support foot 105, which is described as follows: See also Figures 1 to 8 , is a wheelchair brake structure applicable to multiple scenarios as the best embodiment of the present invention, comprising: The flip structure 200 includes a flip link 201 and a telescopic sleeve 202 vertically fixed to one end of the flip link 201. The other end of the flip link 201 is hinged to the base 100 of the electric wheelchair, and is used to flip up or down relative to the base 100 when the brake lever 104 of the electric wheelchair is pulled. In this embodiment, an oblique reinforcement rib 203 is further provided between the flip link 201 and the telescopic sleeve 202. One end of the flip link 201 forms a rotating shaft sleeve 204 which is perpendicular to the flip link 201 and the telescopic sleeve 202. The rotating shaft sleeve 204 is hinged on the base 100 of the electric wheelchair, so that the flipping up and down around the base 100 can be realized. In addition, in order to realize the fixed position of the flip link 201 when it flips down, a corresponding limit block (not shown in the figure) can be set on the base 100. When the flip link 201 flips down, the position where its lower end contacts the limit block is the fixed position.

[0027] The telescopic assembly 300 includes a telescopic rod 301 and a foot pad 302 disposed at the bottom of the telescopic rod 301. The telescopic rod 301 is slidably matched with the telescopic sleeve 202 and can be extended and retracted along the axial direction of the telescopic sleeve 202. In this embodiment, the foot pad 302 is a deformable foot pad 302 made of elastic material, such as PU material, rubber material or silicone material, so as to provide a certain buffer for the contact between the bottom of the telescopic rod 301 and the ground. The deformable foot pad 302 can further adapt to the flipping process of the flip structure 200, so that the foot pad 302 is always in a flush contact state with the ground.

[0028] The locking mechanism 400 is arranged at one end of the telescopic sleeve 202, and includes a fixed sleeve 401 connected to the telescopic sleeve 202, a movable sleeve 402 rotatably connected to the fixed sleeve 401, and a driving device 403 for driving the movable sleeve 402 to rotate toward or away from the fixed sleeve 401. A clamping groove 404 adapted to the telescopic rod 301 is formed between the fixed sleeve 401 and the movable sleeve 402, and the telescopic rod 301 passes between the two clamping grooves 404; The resetting assembly 500 is disposed in the telescopic sleeve 202 and is used to elastically press the telescopic rod 301 downward so that the telescopic rod 301 has a tendency to move downward.

[0029] Preferably, Figure 3 As shown, a telescopic cavity 600 is provided in the telescopic sleeve 202 along its axial direction, and guide holes 603 are formed on the upper and lower sides of the telescopic cavity 600 and penetrate to the outside along the axial direction of the fixed sleeve 401, and the diameter of the guide hole 603 is smaller than the telescopic cavity 600. The telescopic rod 301 passes through the telescopic cavity 600 along the two guide holes 603, and the telescopic rod 301 has an annular limiting edge 303 in the telescopic cavity 600, and the limiting edge 303 is matched with the side wall gap of the telescopic cavity 600, and the limiting edge 303 divides the telescopic cavity 600 into an upper compression cavity 601 and a lower compression cavity 602 with variable volumes.

[0030] Furthermore, it also includes a three-way air valve 800, and two air outlets of the three-way air valve 800 are connected to the upper compression chamber 601 and the lower compression chamber 602 through air guide pipes 802 respectively.

[0031] Specifically, the side walls of the telescopic sleeve 202 are respectively provided with a pair of gas guide interfaces 604, which are respectively connected to the upper compression chamber 601 and the lower compression chamber 602, and the gas guide pipeline 802 is plugged and fixed between the gas guide interface 604 and the gas outlet of the three-way valve 800, thereby forming a stable gas passage, which is convenient for realizing the air pressure regulation of the upper compression chamber 601 and the lower compression chamber 602.

[0032] The air pressure of the upper compression chamber 601 and the lower compression chamber 602 can be adjusted to a certain extent through the three-way air valve 800. When the flip structure 200 flips down, the foot pad 302 contacts the ground, causing the telescopic rod 301 to move upward relative to the telescopic sleeve 202. At this time, the air in the upper compression chamber 601 is in a compressed state. At this time, the air passage of the upper compression chamber 601 is closed so that the gas in the upper compression chamber 601 buffers the process of the foot pad 302 touching the ground, and the air passage in the lower compression chamber 602 is opened so that the air pressure in the lower compression chamber 602 cooperates with the rise of the telescopic rod 301 to maintain stability, and at the same time, the telescopic rod 301 can be prevented from bouncing down again. When the flip structure 200 has finished flipping down, before holding the telescopic rod 301 tightly, the gas passage of the upper compression chamber 601 can be opened through the three-way air valve 800, and a certain amount of gas can be continuously added inward to increase the air pressure in the upper compression chamber 601, thereby increasing the downward pressure of the telescopic rod 301 and making the foot pad 302 press against the ground, thereby avoiding only slight contact between the foot pad 302 and the ground, thereby increasing the friction between the foot pad 302 and the ground, and further enhancing the stability of the braking state.

[0033] Further, such as Figure 3 , 7 As shown, both air pipes 802 are provided with air pressure sensors 803 for reflecting the air pressure in the air pipes 802. The air pressure sensors 803 can obtain real-time air pressure data in the upper compression chamber 601 and the lower compression chamber 602, so as to control the three-way air valve 800 according to the data.

[0034] In order to better realize the automatic control of the brake structure, a control module 900 is also provided in the present embodiment. The control module 900 can select an STM32 circuit board or an MCU microprocessor. The input end of the control module 900 is connected to a contact-triggered contact switch 901. The contact switch 901 is arranged on one side of the brake lever 104 of the electric wheelchair. When the brake lever 104 is pulled to make the flip structure 200 flip down, the contact switch 901 is triggered.

[0035] The input end of the control module 900 is also connected to two air pressure sensors 803, and the output end thereof is electrically connected to the three-way air valve 800 and the micro motor. Thus, when the brake lever 104 is pulled to make the flip structure 200 flip down, the contact switch 901 triggers the control module 900 to operate, and the air pressure state in the upper compression chamber 601 and the lower compression chamber 602 is obtained through the feedback data of the two air pressure sensors 803. When the air pressure in the upper compression chamber 601 and the lower compression chamber 602 is in a stable state, it means that the telescopic rod 301 is in a suitable telescopic position in contact with the ground. At this time, the control The three-way air valve 800 continues to fill the upward compression chamber 601 with a portion of gas, increasing the downward pressure of the telescopic rod 301, so that the foot pad 302 is pressed against the ground, thereby avoiding that the foot pad 302 is only slightly in contact with the ground, thereby increasing the friction between the foot pad 302 and the ground, and further enhancing the stability of the braking state. Subsequently, the control module 900 controls the micro motor to drive the movable sleeve 402 to rotate close to the fixed sleeve 401, thereby holding the telescopic rod 301 tightly, making it relatively fixed with the telescopic sleeve 202, and completing the downward flipping process of the supporting foot 105.

[0036] Preferably, Figure 3 As shown, sealing rings 700 are provided inside the two guide holes 603 and on the outer peripheral side of the limiting edge 303. The sealing rings 700 ensure that the telescopic rod 301 will not leak during the telescopic process, thereby maintaining the air tightness of the system.

[0037] Preferably, Figure 3 As shown, a return spring is provided in the upper compression chamber 601 and is distributed axially along the telescopic sleeve 202. The return assembly 500 is the return spring. The return spring is sleeved on the outer peripheral side of the telescopic rod 301 and its upper and lower ends are movably abutted against the upper bottom surface of the upper telescopic chamber 600 and the upper end surface of the limit edge 303 respectively. The return spring provides a constant elastic force to ensure that the telescopic rod 301 automatically returns to its original position when not subjected to external force. At the same time, the return spring can also provide a certain buffer for the rising process of the telescopic rod 301, so that the downward flipping process of the supporting foot 105 is more stable and controllable.

[0038] Preferably, Figure 4 , 5 As shown in Figures 6 and 7, the fixed sleeve 401 and the movable sleeve 402 are both semi-cylindrical. The fixed sleeve 401 has a connecting seat 405 protruding from one side along its radial direction. The connecting seat 405 is vertically penetrated to form a first pivot hole 406. The movable sleeve 402 and the connecting seat 405 have a pair of connecting parts 407 symmetrically protruding from the same side and located at the upper and lower sides thereof. The connecting parts 407 are vertically penetrated to form a second pivot hole 408 opposite to the first pivot hole 406. The first pivot hole 406 and the second pivot hole 408 are rotatably connected by inserting a rotating shaft (not shown in the figure).

[0039] Through the connecting seat 405, the connecting part 407 and the rotating shaft, the movable sleeve 402 can be turned outward and inward relative to the fixed sleeve 401, so that the two clamping grooves 404 can be clamped and disengaged from the outer wall of the telescopic rod 301, thereby facilitating the fixation of the telescopic rod 301.

[0040] In order to further enhance the fixing effect of the telescopic rod 301, a friction sleeve 409 made of silicone material is provided on the inner wall of the two clamping grooves 404 and along the axial direction of the telescopic rod 301. The friction sleeve 409 also has arc-shaped friction strips 410 arranged at equal intervals along the axial direction of the telescopic rod 301. The friction strips 410 on the two clamping grooves 404 are positioned opposite to each other and form an annular whole distributed around the circumference of the telescopic rod 301 when the fixed sleeve 401 and the movable sleeve 402 are clamped. Therefore, the clamping friction force on the telescopic rod 301 can be further increased through the friction sleeve 409 and the friction strip 410, and the fixing state between it and the telescopic sleeve 202 can be enhanced.

[0041] Furthermore, the fixed sleeve 401 protrudes from one side away from the connecting seat 405 to form a fixed seat 411, the movable sleeve 402 protrudes from the same side of the fixed seat 411 to form a matching seat 412 symmetrical to the fixed seat 411, the middle of the fixed seat 411 and the middle of the matching seat 412 are respectively penetrated to form a first mounting groove 413 and a second mounting groove 414 which are opposite to each other, the first mounting groove 413 is embedded with a bearing member 415, the second mounting groove 414 is embedded with a locking portion 416, the locking portion 416 is penetrated to form an internal threaded hole 417 which is colinear with the rotation axis of the bearing member 415, the driving device 403 is a micro motor, the output shaft of the micro motor passes through the internal threaded hole 417 along the side of the movable sleeve 402 away from the fixed sleeve 401 and is rotatably connected to the bearing member 415, and the outer wall of the output shaft is provided with an external threaded section 418 which is threadedly connected to the internal threaded hole 417.

[0042] In this embodiment, in order to limit the rotation of the micro motor, a limiting sleeve (not shown in the figure) is added to the outer peripheral side of the movable sleeve 402, and the limiting sleeve forms a limiting groove adapted to the shape of the micro motor, and the limiting groove is connected to the movable base of the micro motor. Thus, the output shaft of the micro motor can rotate freely and the rotation of the micro motor can be limited through the limiting sleeve, thereby avoiding the situation where the output shaft is fixed while the micro motor rotates.

[0043] Thus, when the output shaft of the micromotor is working, the external threaded section 418 at its upper end rotates relative to the internal threaded hole 417, driving the locking portion 416 to move axially along the external threaded section 418. The moving distance only needs to ensure that the friction sleeve 409 and the friction strip 410 can be separated from or pressed against the outer wall of the telescopic rod 301. Therefore, the moving distance only needs to be within a small range. Ultimately, through the threaded cooperation between the external threaded section 418 and the internal threaded hole 417, the movable sleeve 402 and the fixed sleeve 401 are brought close to or away from each other, and the clamping groove 404 is clamped or loosened on the outer wall of the telescopic rod 301.

[0044] Preferably, Figure 6 As shown, a first elastic buffer layer 419 is provided between the bearing member 415 and the first mounting groove 413, and between the locking portion 416 and the second mounting groove 414. In this embodiment, the first elastic buffer layer 419 is made of PU material. Thus, the first elastic buffer layer 419 made of PU material can allow the bearing member 415 and the locking portion 416 to produce a certain angle and position change within the elastic deformation limit of the first elastic buffer layer 419, thereby adapting to the arc trajectory of the flipping of the movable sleeve 402 and avoiding jamming.

[0045] Preferably, Figure 6 As shown, the output side of the micro motor is provided with a second elastic buffer layer 420 distributed around the output shaft. The second elastic buffer layer 420 is made of PU material, and the second elastic buffer layer 420 is in active contact with the outer wall of the movable sleeve 402. Therefore, the second elastic buffer layer 420 can protect the micro motor, reduce the impact of external shocks on the motor, and can avoid the self-rotation of the micro motor to a certain extent.

[0046] The beneficial effects of the present invention are as follows: The present invention realizes a more flexible and adaptable braking function by designing the flip structure 200 and the telescopic assembly 300 separately. Specifically, in the unbraked state, the reset assembly 500 puts the telescopic assembly 300 in the maximum travel position. When the user operates the brake lever 104 to flip the flip structure 200 downward, the foot pad 302 of the telescopic assembly 300 first contacts the ground. As the flip structure 200 continues to flip downward, the telescopic rod 301 is dynamically adjusted in the telescopic sleeve 202 to adapt to the downward flipping stroke of the flip structure 200. When the flip structure 200 is completely flipped down into place, the telescopic rod 301 reaches a suitable telescopic height. At this time, the locking assembly hugs the outer wall of the telescopic rod 301, fixes it relatively to the telescopic sleeve 202, and forms a stable limiting support structure.

[0047] Compared with the traditional fixed support foot 105, the design of the present invention can better adapt to the complex ground environment with tilt, unevenness or steps. Through the dynamic adjustment of the telescopic rod 301, it is ensured that the support foot 105 is completely in contact with the ground, and the wheelchair is prevented from tilting slightly forward and backward, thereby significantly improving the safety of use. In addition, this design also helps users get on and off the wheelchair more safely and conveniently, greatly improving the user experience.

[0048] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A wheelchair brake structure applicable to multiple scenarios, characterized in that: include: The flip structure (200) comprises a flip connecting rod (201) and a telescopic sleeve (202) vertically fixed to one end of the flip connecting rod (201); the other end of the flip connecting rod (201) is hinged to the base (100) of the electric wheelchair and is used to generate an upward or downward flipping action relative to the base (100) when the brake lever (104) of the electric wheelchair is pulled; A telescopic assembly (300) comprises a telescopic rod (301) and a foot pad (302) arranged at the bottom of the telescopic rod (301), wherein the telescopic rod (301) is slidably matched with the telescopic sleeve (202) and can be telescoped along the axial direction of the telescopic sleeve (202); The locking mechanism (400) is arranged at one end of the telescopic sleeve (202), and comprises a fixed sleeve (401) connected to the telescopic sleeve (202), a movable sleeve (402) rotatably connected to the fixed sleeve (401), and a driving device (403) for driving the movable sleeve (402) to rotate toward or away from the fixed sleeve (401), wherein a clamping groove (404) adapted to the telescopic rod (301) is formed between the fixed sleeve (401) and the movable sleeve (402), and the telescopic rod (301) passes between the two clamping grooves (404); The resetting assembly (500) is disposed in the telescopic sleeve (202) and is used to elastically press the telescopic rod (301) downward so that the telescopic rod (301) has a tendency to move downward.

2. A wheelchair brake structure applicable to multiple scenarios according to claim 1, characterized in that: A telescopic cavity (600) is provided in the telescopic sleeve (202) along its axial direction. Guide holes (603) are formed on the upper and lower sides of the telescopic cavity (600) and extend through the fixed sleeve (401) axially to the outside. The diameter of the guide holes (603) is smaller than that of the telescopic cavity (600). The telescopic rod (301) passes through the telescopic cavity (600) along the two guide holes (603). The telescopic rod (301) has an annular limiting edge (303) in the telescopic cavity (600). The limiting edge (303) is in clearance with a side wall of the telescopic cavity (600). The limiting edge (303) divides the telescopic cavity (600) into an upper compression cavity (601) and a lower compression cavity (602) with variable volumes.

3. A wheelchair brake structure applicable to multiple scenarios according to claim 2, characterized in that: It also includes a three-way air valve (800), wherein two air outlets of the three-way air valve (800) are respectively connected to the upper compression chamber (601) and the lower compression chamber (602) via air guide pipes (802).

4. A wheelchair brake structure applicable to multiple scenarios according to claim 3, characterized in that: Both of the air guide pipes (802) are provided with an air pressure sensor (803) for reflecting the air pressure in the air guide pipes (802).

5. The wheelchair brake structure applicable to multiple scenarios according to claim 2, characterized in that: Sealing rings (700) are provided inside the two guide holes (603) and on the outer peripheral side of the limiting edge (303).

6. The wheelchair brake structure applicable to multiple scenarios according to claim 2, characterized in that: A return spring is provided in the upper compression chamber (601) and is distributed axially along the telescopic sleeve (202). The return spring is sleeved on the outer peripheral side of the telescopic rod (301) and its upper and lower ends are movably abutted against the upper bottom surface of the upper telescopic chamber (600) and the upper end surface of the limit edge (303), respectively.

7. The wheelchair brake structure applicable to multiple scenarios according to claim 1, characterized in that: A connecting seat (405) protrudes from one side of the fixed sleeve (401), and the connecting seat (405) is vertically penetrated to form a first pivot hole (406). The movable sleeve (402) and the connecting seat (405) are symmetrically protruding from the same side and located at the upper and lower sides thereof. The connecting portions (407) are vertically penetrated to form a second pivot hole (408) opposite to the first pivot hole (406). The first pivot hole (406) and the second pivot hole (408) are rotatably connected by inserting a rotating shaft.

8. The wheelchair brake structure applicable to multiple scenarios according to claim 7, characterized in that: The fixed sleeve (401) protrudes from one side away from the connecting seat (405) to form a fixed seat (411), and the movable sleeve (402) protrudes from the same side as the fixed seat (411) to form a matching seat (412) symmetrical to the fixed seat (411). The middle of the fixed seat (411) and the middle of the matching seat (412) are respectively penetrated to form a first mounting groove (413) and a second mounting groove (414) which are opposite to each other. The first mounting groove (413) is embedded with a bearing member (415), and the second mounting groove (414) is embedded with a bearing member (415). A locking portion (416) is embedded in the groove (414), and the locking portion (416) penetrates to form an internal threaded hole (417) colinear with the rotation axis of the bearing member (415). The driving device (403) is a micro motor, and the output shaft of the micro motor passes through the internal threaded hole (417) along the side of the movable sleeve (402) away from the fixed sleeve (401) and is rotatably connected to the bearing member (415). The outer wall of the output shaft is provided with an external threaded section (418) threadedly connected to the internal threaded hole (417).

9. The wheelchair brake structure applicable to multiple scenarios according to claim 8, characterized in that: A first elastic buffer layer (419) is provided between the bearing member (415) and the first installation groove (413), and between the locking portion (416) and the second installation groove (414).

10. The wheelchair brake structure applicable to multiple scenarios according to claim 8, characterized in that: The output side of the micro motor is provided with a second elastic buffer layer (420) distributed around the output shaft.

Images