JP6810850B2 - Trunk that can automatically climb stairs - Google Patents

Description

The present invention takes up the field of automation technology for climbing stairs, and specifically, is a trunk that can automatically climb stairs.

The existing trunk that can automatically climb stairs requires the installation of dedicated stair climbing equipment in the building, which is expensive. In addition, since it is necessary to set up a dedicated space in the building, it is not possible to install equipment for climbing stairs in some buildings, and it is difficult to spread it on a large scale. The equipment designed by the present invention can solve the above problems.

Publication No. 10957745 of Chinese Patent Application

It is an object of the present invention to provide a trunk that can automatically climb stairs and to eliminate the above-mentioned drawbacks in the existing technology.

The trunk that can automatically climb the stairs of the present invention includes the trunk, and four short rods that are vertically and front-to-back symmetrical are fixedly connected to the outer wall surface on the right side of the trunk, and casters are on the right side of the short rods. Rotatably connected, a partition plate is fixedly connected in the trunk, and the partition plate divides the trunk into front and rear to form two internal chambers, a lower chamber and an upper chamber, and the lower chamber. Is open to the rear, the upper chamber is open to the front, and a lower cover plate and an upper cover plate are installed on the rear end wall surface of the lower chamber and the front end wall surface of the upper chamber, respectively. The rear end wall surface of the lower chamber and the upper chamber are connected to the lower cover plate and the upper cover plate by gears, respectively, and the lower cover plate and the upper cover plate can be opened and closed by the fasteners, and the center of the partition plate. Two symmetrical hooking devices are installed, a gear housing inside the lower chamber is fixedly connected to the rear end of the hooking device, and an internal chamber of the gear housing is installed inside the gear housing. A motion switching device is installed in the internal chamber of the gear housing, and the motion switching device can automatically provide power to the entire trunk that can climb the stairs, and can also switch the motion pattern. Four machine legs arranged symmetrically in the center are rotatably connected, the machine legs can rotate, and power from the motion switching device can be transmitted, and the machine legs are rotatably connected to the ends of the machine legs. , The mechanical legs can rotate to climb the stairs,
After the motion switching device rotates and interlocks the machine legs behind at a certain angle, the motion switching device changes the work pattern and rotates and interlocks the machine legs to enable climbing a staircase.

Preferentially, the hooking device includes a large symmetrical hole, the large hole is installed so as to communicate with the partition plate, and a small internal chamber symmetrical is installed in the large hole. A hook rod is slidably connected to the small internal chamber, a hook rod spring is connected between the hook rod and the small internal chamber, and the hook rod is connected to the hook rod. The hook block fixedly connected to the gear housing is in contact with the hook block, and the rear end surface of the hook block and the gear housing are fixedly connected to each other.
The hooking device enables fixed connection and disconnection between the motion switching device and the separating plate.

Preferentially, the motion switching device includes a main motor shaft that is rotatably connected to the gear housing and extends vertically, and a drive wheel is fixedly connected to the upper end of the main motor shaft. A main motor fixed to the inner wall of the gear housing is rotatably connected to the lower end of the shaft, extends vertically into the gear housing, and the motor shaft on the right side of the main motor shaft is rotatably connected. A motor fixed to the inner wall of the gear housing is electrically connected to the lower end of the motor shaft, a cam is fixedly connected to the upper end of the motor shaft, and the left and right end faces of the cam are driven. When the rod and the driven short rod are slidably mounted and the cam rotates, the driven rod and the driven short rod move up and down, and a gear that is symmetrical and extends vertically in the gear housing. Two switching shafts are rotatably connected, and the gear switching shaft on the left side is taken as an example. The gear switching shaft is on the left side of the motor shaft, and a main sleeve is slidably connected to the gear switching shaft. Two large turning discs are vertically and fixedly connected to the main sleeve, and the large turning disc is provided with an annular turning disc groove that opens to the outside along the radial direction of the large turning disc. A play gear connected so as to mesh with the drive wheel is fixedly connected to the main sleeve, and a small pulley above the play gear is fixedly connected to the main sleeve, and the small size on both the left and right sides is fixedly connected. A V-belt is connected between the pulleys, the left end surface of the driven rod and the left main sleeve are fixedly connected, and the right end surface of the driven short rod and the right main sleeve are fixedly connected. Two main shafts that are symmetrical and extend vertically are rotatably connected to the main shaft, and a middle gear that meshes with the play gear is fixedly connected to the main shaft. Two vertically symmetrical small sleeves are slidably connected to the small sleeve, a small spline wheel is fixedly connected to the top end surface of the small sleeve, and a large spline ring below the small spline ring is fixedly connected to the small sleeve. Is fixedly connected to the small sleeve, and a small turning machine below the large spline wheel is fixedly connected to the small turning machine, and the side of the small turning machine close to the large turning machine is in the turning machine groove. It is inserted and does not affect the rotation of the small turning machine and the large turning machine .
The motion switching device enables the cooperative rotation of the machine leg and the machine foot, or the independent rotation of the machine foot.

Preferentially, the mechanical leg includes the small spline ring and a mechanical leg shell connected by a spline, and a downwardly open outer shell inner chamber and a shell inner chamber are installed in the mechanical leg shell. The outer shell inner chamber and the main shaft have the same axis and provide a moving space for the vertical movement of the small spline wheel, and the shell inner chamber is located on the left side of the outer shell inner chamber. The main pulley and the main gear are connected to the large spline wheel by a spline, and the main pulley and the main gear are fixedly connected to form a composite wheel, and the composite wheel has a hole that penetrates vertically. It is installed and is connected to the composite wheel so that the synchronous belt meshes with each other, and the left end of the synchronous belt and the mechanical leg are connected so as to mesh with each other, and the synchronous belt transmits the power of the composite wheel to the mechanical leg. Can be
By rotating the mechanical legs, the mechanical legs can be moved to the operating position and power can be transmitted to the mechanical legs.

Preferentially, the mechanical legs include a rotating wheel connected so as to mesh with the synchronous belt, a rotating wheel internal chamber is installed in the rotating wheel, and the rotating wheel extends vertically and the rotation. Rotating wheel shafts extending from both side walls of the ring are rotatably connected, the lower end surface of the rotating wheel shaft and the inner wall surface of the shell inner chamber are slidably connected, and the upper end surface of the rotating wheel shaft is an urging rod. The upper end surface of the urging rod is fixedly connected to the outer wall surface of the trunk, and the clasp on the lower side of the urging rod is fixedly connected to the rotating wheel shaft. Two symmetrical clasp springs are fixedly connected to the lower end surface of the clasp, and the lower end surface of the clasp spring and the lower wall surface of the rotating wheel internal chamber are fixedly connected to rotate. Three pins uniformly arranged in an annular shape are fixedly connected to the upper inner wall of the ring, a telescopic cylinder is fixedly connected to the lower end surface of the pin, and the rotating wheel is contained in the telescopic cylinder. An expansion / contraction cylinder internal chamber opened to the outside along the radial direction is installed, an expansion / contraction rod is slidably connected to the expansion / contraction cylinder internal chamber, and a clasp hole penetrating vertically is installed in the expansion / contraction rod. A rubber ball is fixedly connected to the outward facing side of the rod along the radial direction of the rotating wheel, and a telescopic spring is fixedly connected to the other end face of the telescopic rod. The other end face is fixedly connected to the bottom surface of the telescopic cylinder inner chamber, the telescopic rod can be expanded and contracted, and the clasp can fix the stored telescopic rod, thereby accommodating the mechanical legs. This is particularly convenient, and when the motion switching device is fixedly attached to the partition plate, the urging rod can release the telescopic rod by pressing the rotating wheel shaft.
By rotating the mechanical legs, the rubber balls on the telescopic rod and the stairs are gradually brought into contact with each other to climb the stairs.

Advantages of the present invention: The present invention does not require any other device, can automatically climb stairs, the user can easily move up and down stairs with a trunk, and the stair climbing device in the trunk is removable. Furthermore, the mechanical legs of the stair climbing device can be expanded and contracted, which is convenient for storage.

In order to explain the present invention in detail with reference to FIGS. 1 to 6 below and to explain the present invention in a convenient manner, the following directions are defined as follows: FIG. 1 is a front view of the apparatus of the present invention, and is described above and below. The left-right front-back direction and the up-down, left-right front-back direction of the self-projection relationship in FIG. 1 are the same.

FIG. 1 is a schematic diagram of the overall configuration of a trunk of the present invention that can automatically climb stairs. FIG. 2 is a schematic configuration diagram of AA in FIG. FIG. 3 is a schematic configuration diagram of BB in FIG. FIG. 4 is a schematic configuration diagram of CC in FIG. FIG. 5 is a schematic configuration diagram of DD in FIG. FIG. 6 is an enlarged schematic diagram of the configuration of E in FIG.

The trunk that can automatically climb the stairs of the present invention includes the trunk 45, and four short rods 44 that are vertically and front-to-back symmetrical are fixedly connected to the outer wall surface on the right side of the trunk 45, and the right side of the short rod 44. A caster 43 is rotatably connected to the trunk 45, and a partition plate 46 is fixedly connected to the trunk 45. The partition plate 46 divides the trunk 45 into front and rear parts, and the lower chamber 47 and the upper chamber 54 are connected to each other. Two internal chambers are formed, the lower chamber 47 is open rearward, the upper chamber 54 is open forward, and the rear end wall surface of the lower chamber 47 and the front end wall surface of the upper chamber 54 are formed. The lower cover plate 49 and the upper cover plate 52 are installed respectively, and the rear end wall surface of the lower chamber 47 and the upper chamber 54 are connected to the lower cover plate 49 and the upper cover plate 52 by fasteners, respectively. The lower cover plate 49 and the upper cover plate 52 can be opened and closed by a fastener, two centrally symmetric hooking devices 100 are installed on the separating plate 46, and the inside of the lower chamber 47 is at the rear end of the hooking device 100. The gear housing 11 is fixedly connected, the gear housing internal chamber 48 is installed in the gear housing 11, and the motion switching device 200 is installed in the gear housing internal chamber 48, and the motion switching is performed. The device 200 can automatically provide power to the entire trunk that can climb the stairs, and can also switch the movement pattern. The movement switching device 200 is rotatably connected to four mechanical legs 300 arranged in a centrally symmetrical manner. The mechanical leg 300 can rotate, and the power of the motion switching device 200 can also be transmitted. The mechanical leg 400 is rotatably connected to the end of the mechanical leg 300, and the mechanical leg 400 rotates. Allows you to climb stairs
After the motion switching device 200 rotates and interlocks the machine legs 300 behind at a certain angle, the motion switching device 200 changes the work pattern and rotates and interlocks the machine legs 400 to enable climbing stairs.

Preferably, the hooking device 100 includes a large punched hole 73 that is symmetrical to the left and right, and the large punched hole 73 is installed so as to communicate with the partition plate 46, and a small internal that is symmetrical to the left and right in the large punched hole 73. A chamber 67 is installed, a hook rod 69 is slidably connected into the small internal chamber 67, and a hook rod spring 68 is connected between the hook rod 69 and the small internal chamber 67. A hook block 70 fixedly connected to the gear housing 11 is in contact between the hook rods 69, and the rear end surface of the hook block 70 and the gear housing 11 are fixedly connected to each other. Being done
The hooking device 100 enables fixed connection and disconnection between the motion switching device 200 and the partition plate 46.

Preferably, the motion switching device 200 includes a main motor shaft 35 that is rotatably connected to the gear housing 11 and extends vertically, and a drive wheel 32 is fixedly connected to the upper end of the main motor shaft 35. A main motor 38 fixed to the inner wall of the gear housing 11 is movably connected to the lower end of the main motor shaft 35, extends vertically into the gear housing 11, and is on the right side of the main motor shaft 35. The motor shaft 36 is rotatably connected to the lower end of the motor shaft 36, a motor 37 fixed to the inner wall of the gear housing 11 is movably connected to the lower end of the motor shaft 36, and a cam 29 is connected to the upper end of the motor shaft 36. The driven rod 28 and the driven short rod 31 are slidably mounted on the left and right end faces of the cam 29, respectively, and when the cam 29 rotates, the driven rod 28 and the driven short rod 31 move up and down. In the gear housing 11, two gear switching shafts 22 that are symmetrical and extend vertically are rotatably connected, and the gear switching shaft 22 on the left side is taken as an example, and the gear switching shaft 22 is used as an example. Is on the left side of the motor shaft 36, the main sleeve 24 is slidably connected to the gear switching shaft 22, and two large turning discs 59 are vertically and fixedly connected to the main sleeve 24. An annular turning board groove 71 opened to the outside along the radial direction of the large turning board 59 is installed in the large turning board 59, and is connected to the main sleeve 24 so as to mesh with the drive wheel 32. The play gear 34 is fixedly connected, the small pulley 25 above the play gear 34 is fixedly connected to the main sleeve 24, and the V-belt 26 is connected between the small pulleys 25 on both the left and right sides. The left end surface of the driven rod 28 and the left main sleeve 24 are fixedly connected, and the right end surface of the driven short rod 31 and the right main sleeve 24 are fixedly connected to each other. Two main shafts 58 that are symmetrical and extend vertically are rotatably connected to the main shaft 58, and a middle gear 33 that meshes with the play gear 34 is fixedly connected to the main shaft 58. Two vertically symmetrical small sleeves 17 are slidably connected to 58, a small spline ring 21 is fixedly connected to the top end surface of the small sleeve 17, and the small spline ring 21 is fixedly connected to the small sleeve 17. The large spline wheel 42 below is fixedly connected, and the small turning board 41 below the large spline wheel 42 is fixedly connected to the small sleeve 17, and the small turning board 41 The side close to the large turning board 59 is inserted into the turning board groove 71, and does not affect the rotation of the small turning board 41 and the large turning board 59 .
The motion switching device 200 enables the cooperative rotation of the machine leg 300 and the machine foot 400, or the original rotation of the machine foot 400.

Preferably, the mechanical leg 300 includes the small spline wheel 21 and a mechanical leg shell 40 connected by a spline, and the mechanical leg shell 40 includes a downwardly open outer shell inner chamber 18 and the inside of the shell. A chamber 27 is installed, the outer shell inner chamber 18 and the main shaft 58 have the same axis, and provide a movement space for the vertical movement of the small spline wheel 21, and the shell inner chamber 27 is the outer shell. Located on the left side of the shell internal chamber 18, the main pulley 19 and the main gear 20 are connected to the large spline wheel 42 by a spline, and the main pulley 19 and the main gear 20 are fixedly connected to the composite wheel. 39 is formed, a punch hole 72 penetrating vertically is installed in the composite wheel 39, and the synchronous belt 15 is connected to the composite wheel 39 so as to mesh with the left end of the synchronous belt 15 and the mechanical foot 400. Are meshed with each other, and the synchronous belt 15 can transmit the power of the composite wheel 39 to the mechanical foot 400.
By rotating the mechanical legs 300, the mechanical legs 400 can be moved to the operating position and power can be transmitted to the mechanical legs 400.

Preferably, the mechanical foot 400 includes a rotary wheel 13 connected so as to mesh with the synchronous belt 15, a rotary wheel internal chamber 66 is installed in the rotary wheel 13, and the rotary wheel 13 is moved up and down. Rotating wheel shafts 14 that extend and extend from both side walls of the rotating wheel 13 are rotatably connected, and the lower end surface of the rotating wheel shaft 14 and the inner wall surface of the shell internal chamber 27 are slidably connected to each other. The upper end surface of the rotary wheel shaft 14 is in contact with the urging rod 12, the upper end surface of the urging rod 12 is fixedly connected to the outer wall surface of the trunk 45, and the urging rod 12 is fixedly connected to the rotary wheel shaft 14. The clasp 56 on the lower side is fixedly connected, and two symmetrical clasp springs 65 are fixedly connected to the lower end surface of the clasp 56, and the lower end surface of the clasp spring 65 is fixedly connected. And the lower wall surface of the rotary wheel inner chamber 66 are fixedly connected, and three pins 61 uniformly arranged in an annular shape are fixedly connected to the upper inner wall of the rotary wheel 13 to be under the pin 61. The telescopic cylinder 55 is fixedly connected to the end surface, and the telescopic cylinder internal chamber 63 opened to the outside along the radial direction of the rotating wheel 13 is installed in the telescopic cylinder 55, and the telescopic cylinder internal chamber 63 is installed. A telescopic rod 51 is slidably connected to the telescopic rod 51, and a clasp hole 62 penetrating vertically is installed in the telescopic rod 51 so that the telescopic rod 51 faces outward along the radial direction of the rotating wheel 13. The rubber ball 50 is fixedly connected, the telescopic spring 64 is fixedly connected to the other end face of the telescopic rod 51, and the other end face of the telescopic spring 64 is the bottom surface of the telescopic cylinder internal chamber 63. The telescopic rod 51 can be expanded and contracted, and the clasp 56 can fix the stored telescopic rod 51, which is convenient for storing the mechanical foot 400, and the movement. When the switching device 200 is fixedly attached to the partition plate 46, the urging rod 12 can release the telescopic rod 51 by pressing the rotary wheel shaft 14.
By rotating the mechanical foot 400, the rubber ball 50 on the telescopic rod 51 and the stairs are gradually brought into contact with each other to climb the stairs.

First, the mechanical leg 300 in the motion switching device 200 is parallel to the horizontal plane, the telescopic rod 51 in the mechanical leg 400 is in a contracted state, the lower cover plate 49 is opened with a fastener, and the motion switching device 200 is hooked by the device 100. At the same time, the urging rod 12 pushes the rotary wheel axle 14 in the machine foot 400 to move it away from the gear housing 11, and slides the clasp 56 out of the clasp 62. The telescopic rod 51 extends outward due to the elasticity of the telescopic spring 64, whereby the mechanical foot 400 can automatically extend the telescopic rod 51 during mounting.

During the work, the main motor 38 is started, and the composite wheel 39 and the mechanical leg shell are formed by the main motor shaft 35, the drive wheel 32, the play gear 34, the middle gear 33, the small sleeve 17, and the small spline wheel 21. The rotation with 40 is interlocked, and at the same time, the main motor 38 transmits power to the small pulley 25 on the right side by the main motor shaft 35, the drive wheel 32, the play gear 34, the small pulley 25 on the left side, and the V-belt 26. As a result, the machine legs 300 on both the left and right sides rotate backward at the same time, the composite wheel 39 interlocks the rotation of the machine legs 400 with the synchronous belt 15, and when the machine legs 300 rotate to the operating angle, the motor is operated by a regular program. 37 is activated, the cam 29 is interlocked to translate the driven rod 28 and the driven short rod 31 upward, and the main sleeve 24 is translated upward by pushing the small rotating plate 41 by the large rotating plate 59 to the small sleeve 17. The small spline wheel 21 is interlocked to enter the outer shell internal chamber 18 or the punch hole 72, whereby the small spline wheel 21 is separated from the mechanical leg shell 40, and the scheduled program at this time stops the rotation of the motor 37. The main motor 38 continues to interlock the rotation of the machine foot 400, the machine foot 400 interlocks the rotation of the telescopic rod 51, and the plurality of telescopic rods 51 gradually come into contact with the stairs to enable climbing the stairs.

After finishing the work, the main motor 38 is temporarily stopped, and at the same time, the program rotates the motor 37 in the reverse direction and reconnects the small spline wheel 21 and the mechanical leg shell 40. At this time, the program connects the main motor 38. The machine leg 300 is returned to the horizontal position by rotating in the reverse direction, and the entire device is returned to the initial state.

Advantages of the present invention: The present invention does not require any other device, can automatically climb stairs, the user can easily move up and down stairs with a trunk, and the stair climbing device in the trunk is removable. Furthermore, the mechanical legs of the stair climbing device can be expanded and contracted, which is convenient for storage.

According to the above method, an engineer in this field can make various modifications within the scope of the present invention according to a work pattern.

Claims (5)

When viewed from the front, four short rods that are vertically and front-to-back symmetrical are fixedly connected to the outer wall surface on the right side of the trunk, including the trunk, and casters are rotatably connected to the right side of the short rods. A partition plate is fixedly connected to the inside, and the partition plate divides the trunk into front and rear to form two internal chambers, a lower chamber and an upper chamber, and the lower chamber is open to the rear. The upper chamber is open forward, and a lower cover plate and an upper cover plate are installed on the rear end wall surface of the lower chamber and the front end wall surface of the upper chamber, respectively, and the rear end wall surface of the lower chamber and the upper surface are installed. The lower cover plate and the upper cover plate are connected to the chamber by gears, respectively, the lower cover plate and the upper cover plate can be opened and closed by fasteners, and two centrally symmetrical hooking devices are installed on the separating plate. A gear housing in the lower chamber is fixedly connected to the rear end of the hooking device, a gear housing internal chamber is installed in the gear housing, and a movement is performed in the gear housing internal chamber. A switching device is installed, the motion switching device can automatically provide power to the entire trunk that can climb the stairs, and the motion pattern can be switched. The motion switching device has mechanical legs arranged symmetrically in the center. Four rotatably connected, the machine leg can rotate and the power by the motion switching device can be transmitted, the machine leg is rotatably connected to the end of the machine leg, and the machine leg rotates. A trunk that can automatically climb stairs, which is characterized by enabling climbing stairs. The hooking device includes a large punch hole that is symmetrical to the left and right, the large punch hole is installed so as to communicate with the partition plate, and a small internal chamber that is symmetrical to the left and right is installed in the large punch hole. A hook rod is slidably connected to the inside of the chamber, a hook rod spring is connected between the hook rod and the small internal chamber, and the gear housing is fixed between the hook rods. The automatic staircase according to claim 1, wherein the hooking blocks that are specifically connected are in contact with each other, and the rear end surface of the hooking block and the gear housing are fixedly connected to each other. A trunk that can be climbed. The motion switching device is rotatably connected to the gear housing and includes a main motor shaft extending vertically, and a drive wheel is fixedly connected to the upper end of the main motor shaft and is fixedly connected to the lower end of the main motor shaft. Is rotatably connected to a main motor fixed to the inner wall of the gear housing, extends vertically into the gear housing, and is rotatably connected to a motor shaft on the right side of the main motor shaft. A motor fixed to the inner wall of the gear housing is electrically connected to the lower end of the shaft, a cam is fixedly connected to the upper end of the motor shaft, and a driven rod and a driven short are connected to the left and right end faces of the cam, respectively. When the rod is slidably mounted and the cam rotates, the driven rod and the driven short rod move up and down, and two gear switching shafts that are symmetrical and extend vertically are inside the gear housing. This rotatably connected gear switching shaft is taken as an example, the gear switching shaft is on the left side of the motor shaft, the main sleeve is slidably connected to the gear switching shaft, and the main sleeve is slidably connected to the main sleeve. Two large turning machines are vertically symmetrically and fixedly connected to each other, and the large turning machine is provided with an annular turning machine groove opened to the outside along the radial direction of the large turning machine, and the main sleeve is provided with an annular turning machine groove. Is fixedly connected to a play gear connected so as to mesh with the drive wheel, and a small pulley above the play gear is fixedly connected to the main sleeve between the small pulleys on both the left and right sides. The V-belt is connected, the left end surface of the driven rod and the left main sleeve are fixedly connected, the right end surface of the driven short rod and the right main sleeve are fixedly connected, and the gear. Two main shafts that are symmetrical and extend vertically are rotatably connected in the housing, and a middle gear that meshes with the play gear is fixedly connected to the main shaft, and the main shaft is vertically symmetrical. Two small sleeves are slidably connected, a small spline ring is fixedly connected to the top end surface of the small sleeve, and a large spline ring below the small spline ring is fixedly connected to the small sleeve. Connected, a small turning machine below the large spline wheel is fixedly connected to the small sleeve, and the side of the small turning machine close to the large turning machine is inserted into the turning machine groove and The trunk according to claim 1 or 2, wherein the trunk can automatically climb a staircase according to claim 1 or 2, wherein it does not affect the rotation of the small turning board and the large turning board . The mechanical leg includes the small spline ring and a mechanical leg shell connected by a spline, and an outer shell inner chamber and a shell inner chamber opened downward are installed in the mechanical leg shell, and the outer shell is provided. The inner shell chamber and the main shaft have the same axis and provide a space for movement of the small spline wheel up and down, and the inner shell chamber is located on the left side of the outer shell inner chamber and the large spline wheel. The main pulley and the main gear are connected by a spline, and the main pulley and the main gear are fixedly connected to form a composite wheel, and the composite wheel is provided with a through hole that penetrates vertically. The synchronous belt is connected to the composite wheel so as to mesh with the synchronous belt, the left end of the synchronous belt and the mechanical leg are connected so as to mesh with each other, and the synchronous belt can transmit the power of the composite wheel to the mechanical leg. The trunk according to claim 1 or 3, wherein the trunk can automatically climb a staircase. The mechanical legs include a rotary wheel connected so as to mesh with the synchronous belt, a rotary wheel internal chamber is installed in the rotary wheel, the rotary wheel extends vertically, and both side wall surfaces of the rotary wheel are installed. The rotary wheel shaft extending from the above is rotatably connected, the lower end surface of the rotary wheel shaft and the inner wall surface of the shell inner chamber are slidably connected, and the upper end surface of the rotary wheel shaft abuts on the urging rod. The upper end surface of the urging rod is fixedly connected to the outer wall surface of the trunk, and the retaining metal plate under the urging rod is fixedly connected to the rotating wheel shaft. Two symmetrical clasp springs are fixedly connected to the lower end surface of the rotary wheel, and the lower end surface of the clasp spring and the lower wall surface of the rotary wheel inner chamber are fixedly connected to the upper inner wall of the rotary wheel. Three pins uniformly arranged in an annular shape are fixedly connected to the center, a telescopic cylinder is fixedly connected to the lower end surface of the pins, and the telescopic cylinder is inside the telescopic cylinder along the radial direction of the rotating wheel. An telescopic cylinder internal chamber opened to the outside is installed, a telescopic rod is slidably connected to the telescopic cylinder internal chamber, and a clasp hole penetrating vertically is installed in the telescopic rod, and the rotation of the telescopic rod A rubber ball is fixedly connected to the outward facing side along the radial direction of the ring, and a telescopic spring is fixedly connected to the other end face of the telescopic rod, and the other end face of the telescopic spring is fixedly connected. Is fixedly connected to the bottom surface of the telescopic cylinder internal chamber, the telescopic rod can be expanded and contracted, and the clasp can fix the stored telescopic rod, which is convenient for storing the mechanical legs. 1 or claim 1, wherein when the motion switching device is fixedly attached to the partition plate, the urging rod can release the telescopic rod by pressing the rotary wheel shaft. The trunk that can automatically climb the stairs according to item 3 or claim 4.

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