A star wheel assembly for a stair climbing chair

Abstract

The utility model discloses a stair climbing chair star wheel assembly, comprising a main body bracket, six telescopic slots are provided on the main body bracket, the six telescopic slots are slidably and interlacedly connected with mounting plates, every two adjacent mounting plates are rotatably connected with the same rotating shaft, a fixed sleeve on the rotating shaft is provided with a wheel hub, a rubber tire is fixedly connected to the wheel hub, and an adjustment mechanism is provided on the six mounting plates; the adjustment mechanism comprises a plurality of symmetrically distributed fastening slots provided on the inner wall of the telescopic slot, and a mounting cavity is provided on the mounting plate. The utility model relates to the technical field of stair climbing chairs; the star wheel assembly of the stair climbing chair can perform multi-stage adjustment on the telescopic length of the rubber tire through the arranged adjustment mechanism, so that the spacing between the three rubber tires can be adjusted according to the height of the stair steps, so as to facilitate the rolling on the step surface, facilitate stair climbing, and achieve better application effect.

Description

Technical Field

[0001] The utility model relates to the technical field of stair climbing chairs, in particular to a star wheel assembly of a stair climbing chair. Background Art

[0002] Wheelchairs are essential means of transportation for the elderly and the infirm as well as those with lower limb disabilities. With the increase of barrier-free facilities, the range of activities of wheelchair users has gradually expanded, but stairs have greatly restricted wheelchairs. Stair climbing wheelchairs can be divided into three types according to their transmission mode: star wheel type, crawler type and step support type. Among them, star wheel type stair climbing chairs mainly rely on the star wheel assembly at the bottom to climb stairs.

[0003] Announcement No. CN 208756354 U discloses a three-star wheel stair-climbing wheelchair with slide rail balancing, which relates to the field of stair-climbing wheelchairs. The practical new type includes a rectangular frame-shaped bracket, four three-star wheels arranged at the bottom of the bracket, a seat arranged at the top of the bracket, and an arc slide rail arranged between the seat and the top of the bracket for adjusting the angle between the seat base and the horizontal plane. The left and right sides of the base are respectively arranged in the arc slide rails located on the left and right sides of the base, and slide in the arc slide rails. The arc slide rail is a structure with an arc-shaped track on the plate body. The angle between the base of the practical new seat and the horizontal plane cannot be adjusted, which leads to uncomfortable riding and easy danger.

[0004] However, the stair climbing chair has the following disadvantages: the stair climbing chair can conveniently adjust the horizontal angle of the seat when in use; however, due to the different height differences of the stairs, when the star wheel is small in size and encounters a staircase with a large step surface, it is inconvenient to climb the stairs, and the use effect is limited.

[0005] To this end, the utility model provides a stair climbing chair star wheel assembly to solve the above problems. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a stair climbing chair star wheel assembly to solve the above problems.

[0007] To achieve the above purpose, the utility model is implemented through the following technical solutions: a stair climbing chair star wheel assembly, including a main body bracket, the main body bracket is provided with six telescopic slots, the six telescopic slots are all slidably interlaced with mounting plates, each two adjacent mounting plates are rotatably connected with the same rotating shaft, a wheel hub is fixedly sleeved on the rotating shaft, a rubber tire is fixedly connected to the wheel hub, and an adjustment mechanism is provided on the six mounting plates;

[0008] The adjustment mechanism includes a plurality of symmetrically distributed fastening grooves provided on the inner wall of the telescopic groove, a mounting cavity provided on the mounting plate, four pressing plates provided in the mounting cavity, one side of each of the four pressing plates is fixedly connected with a clamping rod, and one end of each of the four clamping rods slides and extends into the corresponding fastening grooves respectively;

[0009] Two symmetrically distributed bidirectional threaded rods are rotatably connected in the installation cavity, and both ends of the two bidirectional threaded rods are threaded through the corresponding pressing plates. The bidirectional threaded rods can drive the pressing plates to move, which is convenient for control;

[0010] A worm gear is fixedly mounted on the two bidirectional threaded rods, and a worm is rotatably connected to the bottom inner wall of the mounting cavity. The worm is meshed with the two worm gears. The two bidirectional threaded rods can be conveniently controlled to rotate synchronously by using the worm gear and worm in combination.

[0011] Preferably, three movable openings are opened on both sides of the main body bracket, and the movable openings are connected with the corresponding telescopic slots. The movable openings are provided with scale plates. By using the arranged movable openings and the scale plates in combination, the moving distance of the mounting plate can be conveniently indicated, thereby facilitating synchronous adjustment.

[0012] Preferably, an indicator tube is connected through the top of the mounting plate, a transmission shaft is rotatably connected to the indicator tube, the bottom end of the transmission shaft extends into the mounting cavity, the transmission shaft is connected to the worm, and a handwheel is fixedly connected to the top of the transmission shaft. The indicator tube, transmission shaft and handwheel are used in combination to indicate the moving distance of the mounting plate and facilitate the control of the rotation of the worm.

[0013] Preferably, two sliding rods are fixedly connected in the installation cavity, and the two sliding rods slide through the corresponding two pressure plates respectively. The pressure plates can be limited by the provided sliding rods so that they can move smoothly and prevent deflection.

[0014] Preferably, a wear-resistant sleeve is connected through the main body bracket, bearings are provided at both ends of the wear-resistant sleeve, and connecting bolts are slidably connected through the wear-resistant sleeve. The main body bracket can be conveniently installed on the stair climbing chair by using the wear-resistant sleeve, bearings and connecting bolts in combination. Beneficial Effects

[0015] The utility model provides a star wheel assembly for a stair climbing chair. Compared with the prior art, it has the following beneficial effects:

[0016] (1) The star wheel assembly of the stair climbing chair can adjust the telescopic length of the rubber tires in multiple stages through the provided adjustment mechanism, so that the spacing between the three rubber tires can be adjusted according to the height of the stair steps, thereby facilitating the rolling of the stair climbing chair on the step surface, facilitating the use of stair climbing, and achieving better application effect.

[0017] (2) The star wheel assembly of the stair climbing chair can drive the two worm wheels to rotate in the same direction through the worm gear, so as to control the two bidirectional threaded rods to rotate synchronously, which is convenient for operators to use. At the same time, the indicator tube and scale plate can be used to facilitate operators to see the telescopic length of the mounting plate, which is convenient for synchronous adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the external structure of the utility model;

[0019] Figure 2 It is a front view cross-sectional structural schematic diagram of the utility model;

[0020] Figure 3 It is a front view cross-sectional structural schematic diagram of the installation cavity in the utility model;

[0021] Figure 4 It is a side sectional structural schematic diagram of the installation cavity in the utility model.

[0022] In the figure: 1. main bracket; 2. telescopic slot; 3. mounting plate; 4. rotating shaft; 5. wheel hub; 6. rubber tire; 7. fastening slot; 8. mounting cavity; 9. pressure plate; 10. clamping rod; 11. bidirectional threaded rod; 12. worm gear; 13. worm; 14. moving port; 15. scale plate; 16. indicator tube; 17. transmission shaft; 18. handwheel; 19. sliding rod; 20. wear-resistant sleeve; 21. bearing; 22. connecting bolt. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0024] See also Figures 1 to 4 A stair climbing chair star wheel assembly comprises a main frame 1, the main frame 1 is made of aluminum alloy, six telescopic slots 2 are provided on the main frame 1, the six telescopic slots 2 are slidably interlaced with mounting plates 3, each two adjacent mounting plates 3 are rotatably connected with the same rotating shaft 4, a wheel hub 5 is fixedly sleeved on the rotating shaft 4, a rubber tire 6 is fixedly connected to the wheel hub 5, and an adjustment mechanism is provided on the six mounting plates 3;

[0025] The adjustment mechanism includes a plurality of symmetrically distributed fastening grooves 7 provided on the inner wall of the telescopic groove 2, a mounting cavity 8 provided on the mounting plate 3, four pressing plates 9 provided in the mounting cavity 8, one side of the four pressing plates 9 is fixedly connected with a clamping rod 10, and one end of the four clamping rods 10 respectively slides and extends into the corresponding fastening grooves 7. Example

[0026] See also Figures 1 to 4 This embodiment provides a technical solution based on the first embodiment: two symmetrically distributed bidirectional threaded rods 11 are rotatably connected in the installation cavity 8, the two thread surfaces of the two bidirectional threaded rods 11 are opposite, and the thread directions of the two bidirectional threaded rods 11 at the same position are opposite, and the two ends of the two bidirectional threaded rods 11 are respectively threaded through the corresponding pressing plates 9; a worm gear 12 is fixedly sleeved on the two bidirectional threaded rods 11, and a worm 13 is rotatably connected to the bottom inner wall of the installation cavity 8, and the worm 13 is meshed with the two worm gears 12; three moving openings 14 are opened on both sides of the main bracket 1, and the moving openings 14 are connected to the corresponding telescopic slots 2 is connected, and a scale plate 15 is arranged on the moving opening 14; an indicating tube 16 is penetrated and connected on the top of the mounting plate 3, and a transmission shaft 17 is rotatably penetrated and connected on the indicating tube 16, and the bottom end of the transmission shaft 17 extends into the mounting cavity 8, and the transmission shaft 17 is connected to the worm 13, and a hand wheel 18 is fixedly connected to the top of the transmission shaft 17; two sliding rods 19 are fixedly connected in the mounting cavity 8, and the two sliding rods 19 slide through the corresponding two pressing plates 9 respectively; a wear-resistant sleeve 20 is penetrated and connected on the main frame 1, and bearings 21 are arranged at both ends of the wear-resistant sleeve 20, and a connecting bolt 22 is slidably penetrated and connected on the wear-resistant sleeve 20.

[0027] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0028] Working principle: during use, when it is necessary to adjust the spacing of the rubber tires 6 to meet the needs of steps with larger height differences, the hand wheel 18 can be turned in turn. The hand wheel 18 drives the worm 13 to rotate through the transmission shaft 17. The worm 13 drives the two worm wheels 12 meshing with it to rotate synchronously in the opposite direction. The worm wheel 12 drives the connected bidirectional threaded rod 11 to rotate. The bidirectional threaded rod 11 drives the two pressure plates 9 arranged on different thread surfaces of the threaded sleeve to approach each other so that they are completely disengaged from the fastening groove 7. Then, the two mounting plates 3 are pulled to drive the indicator tube 16 to move. When the indicator tube 16 moves to the appropriate position, the clamping rod 10 can be reversed to reinsert it into the fastening groove 7 to fix the rubber tire 6 firmly. The three rubber tires 6 can be adjusted in turn so that they are at the same scale position.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0030] In the description of this article, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, or a connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stair climbing chair star wheel assembly, comprising a main frame (1), characterized in that: The main frame (1) is provided with six telescopic slots (2), and the six telescopic slots (2) are all slidably connected with mounting plates (3), and each two adjacent mounting plates (3) are rotatably connected with a same rotating shaft (4), and a wheel hub (5) is fixedly sleeved on the rotating shaft (4), and a rubber tire (6) is fixedly connected to the wheel hub (5), and the six mounting plates (3) are all provided with adjustment mechanisms; The adjustment mechanism comprises a plurality of symmetrically distributed fastening grooves (7) formed on the inner wall of the telescopic groove (2); a mounting cavity (8) is formed on the mounting plate (3); four pressing plates (9) are arranged in the mounting cavity (8); one side of each of the four pressing plates (9) is fixedly connected to a clamping rod (10); one end of each of the four clamping rods (10) slides and extends into a corresponding fastening groove (7); Two symmetrically distributed bidirectional threaded rods (11) are rotatably connected in the installation cavity (8), and both ends of the two bidirectional threaded rods (11) are threadedly penetrated through corresponding pressure plates (9), and a worm gear (12) is fixedly sleeved on the two bidirectional threaded rods (11). A worm (13) is rotatably connected to the inner wall of the bottom of the installation cavity (8), and the worm gear (13) is meshed with the two worm gears (12).

2. The stair climbing chair star wheel assembly according to claim 1, characterized in that: Three movable openings (14) are provided on both sides of the main frame (1), the movable openings (14) are connected to corresponding telescopic slots (2), and a scale plate (15) is provided on the movable openings (14).

3. The star wheel assembly of the stair climbing chair according to claim 2, characterized in that: An indicator tube (16) is connected through the top of the mounting plate (3), a transmission shaft (17) is rotatably connected through the indicator tube (16), a bottom end of the transmission shaft (17) extends into the mounting cavity (8), the transmission shaft (17) is connected to the worm (13), and a hand wheel (18) is fixedly connected to the top end of the transmission shaft (17).

4. The star wheel assembly of the stair climbing chair according to claim 3, characterized in that: Two sliding rods (19) are fixedly connected in the installation cavity (8), and the two sliding rods (19) slide through the corresponding two pressing plates (9) respectively.

5. The star wheel assembly of the stair climbing chair according to claim 1, characterized in that: A wear-resistant sleeve (20) is connected through the main frame (1), bearings (21) are provided at both ends of the wear-resistant sleeve (20), and a connecting bolt (22) is slidably connected through the wear-resistant sleeve (20).

Images