A trolley case and a manually controlled universal wheel thereof
By installing the solenoid brake assembly in the universal wheel of the trolley case, the manual control of the fixing of the universal wheel is solved, and the stability and practicality of the box is enhanced.
Patent Information
- Application Number
- CN202421240971.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-06-03
AI Technical Summary
Existing trolley boxes are easy to move when placed on public transportation or on a floor with a slope and need to be held with hands. Existing solutions such as adding snaps to the wheels have problems such as inconvenience, easy to get dirty and easy to get damaged.
By installing the electromagnet brake assembly in the universal wheel, the electromagnet is adsorbed on the iron rotating roller, the fixing of the universal wheel can be achieved manually, thereby enhancing the stability of the trolley box.
The universal wheels that manually fix the bottom of the trolley case are realized, which enhances the stability and practicality of the box and avoids inconvenience and potential problems caused by using existing snaps.
Smart Images
Figure CN222722553U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of trolley case accessory devices, in particular to a trolley case and a manually controlled universal wheel thereof. Background Art
[0002] As we all know, a trolley case refers to a suitcase with a trolley and wheels. It is widely used because it is easy to use and is a must-have for traveling and going out. At the same time, the trolley can be divided into a single-tube trolley and a double-tube trolley. The tube of the trolley can also be divided into a square tube and a round tube, so that it is easy to drag when walking and greatly reduce the burden. The current 4-wheeled trolley cases are all universal wheels. When the box is put on public transportation or placed on a sloping floor, the box will move and need to be supported by hand. In order to solve this problem, some may add a buckle to the wheel, which needs to be stepped on by foot, but there are several problems with such control. First, the pedal must be large enough to be stepped on; second, the box will be dirty with feet; third, it is easy to break. Utility Model Content
[0003] In order to solve the above technical problems, the utility model provides a trolley case and its manually controlled universal wheels, which use electromagnets to adsorb brake pads in universal wheels, thereby manually fixing four sets of universal wheels at the bottom of the trolley case, thereby enhancing practicality.
[0004] The utility model discloses a trolley case and a manually controlled universal wheel thereof, comprising a trolley case and a protective box, wherein a hidden plate assembly is arranged at the front end of the trolley case, a trolley assembly is arranged at the front side of the trolley case, a telescopic assembly is arranged in the trolley assembly, the bottom end of the trolley case is connected to the protective box, a cover plate assembly is arranged at the bottom end of the protective box, a universal wheel assembly is arranged at the bottom end of the cover plate assembly, the universal wheel assembly comprises four groups of fixed shells, four groups of first screws and four groups of rotating rollers, threaded sleeves connected with bearings are arranged at the top ends of the four groups of fixed shells, first through holes are arranged at the left and right ends of the four groups of fixed shells respectively, the four groups of first screws respectively pass through the two groups of first through holes, the four groups of first screws are respectively provided with first nuts, the right ends of the four groups of rotating rollers are respectively provided with second through holes, the second through holes are respectively slidably fitted with the first screws, two groups of wheels fitted in a fitting manner are respectively arranged on the four groups of rotating rollers, and electromagnet brake assemblies are respectively arranged at the middle parts of the four groups of rotating rollers.
[0005] Preferably, the electromagnet brake assembly includes four groups of brake boxes, four groups of clamping rings, four groups of covers, four groups of first fixed blocks, eight groups of first slide bars and four groups of first sleeves, the left ends of the four groups of brake boxes are respectively provided with a third through hole, the four groups of rotating rollers are respectively connected to the third through hole bearing sets, the right ends of the four groups of brake boxes are provided with mounting grooves, the right ends of the four groups of brake boxes are respectively connected to the clamping rings, the left ends of the four groups of covers are respectively provided with clamping grooves, the four groups of clamping grooves are respectively clamped with the clamping rings, the left ends of the four groups of covers are respectively provided with fourth through holes, the four groups of rotating rollers are respectively connected to the fourth through holes Perforated sliding set, the right ends of the four groups of mounting grooves are respectively connected to the first fixed blocks, the tops of the four groups of first fixed blocks are respectively connected to the two groups of first sliding rods, the tops of the four groups of electromagnets are respectively provided with two groups of fifth through holes, eight groups of fifth through holes are respectively slidably set with the first sliding rods, the outer walls of the eight groups of first sliding rods are respectively provided with first springs, the tops of the four groups of brake boxes are provided with sixth through holes, the four groups of sixth through holes are respectively connected to the first sleeve sets, the four groups of first sleeves are respectively connected to the top of the inside of the fixed shell, and the tops of the four groups of fixed shells are respectively provided with first through-line holes.
[0006] Preferably, the cover plate assembly includes a cover plate and four groups of second screws, the bottom end of the protective box is respectively provided with four groups of mounting threaded holes, the bottom end of the cover plate is provided with four groups of mounting through holes, the four groups of second screws are respectively threadedly connected with the mounting threaded holes through the mounting through holes, the bottom end of the cover plate is provided with four groups of first through threaded holes, the four groups of first through threaded holes are respectively threadedly connected with the threaded sleeves, and the tops of the four groups of threaded sleeves are respectively provided with second nuts.
[0007] Preferably, the pull rod assembly includes two groups of first square tubes, two groups of second square tubes, a pull rod, a power control button, a telescopic button, two groups of second sliding rods and a battery. The front end of the pull rod box is provided with a first hidden groove and a second hidden groove. The top of the second hidden groove is provided with two groups of square through holes. The two groups of square through holes are respectively slidably mounted with the second square tubes. The top of the protective box is connected to the two groups of first square tubes. The tops of the two groups of first square tubes are respectively provided with first tube grooves. The two groups of first tube grooves are respectively slidably mounted with the second square tubes. The tops of the two groups of second square tubes are respectively provided with second tube grooves. The inner wall of the pull rod is provided with a chamber. The bottom of the pull rod is connected to two groups of second square rods, the two groups of second tube grooves are respectively connected to the first tube groove and the chamber, the bottom end of the chamber is connected to the power control button, the button on the power control button slides out of the bottom end of the pull rod, the left and right ends of the telescopic button are respectively connected to the telescopic assembly, the bottom end of the telescopic button is provided with two groups of slide groove holes, the two groups of slide groove holes are respectively slidably fitted with the second slide rod, the outer walls of the two groups of second slide rods are respectively provided with second springs, the bottom ends of the chambers are respectively connected to the batteries, the front end of the batteries are provided with charging holes, the front end of the pull rod is provided with a through charging hole, and the two groups of first tube grooves are provided with power-on components.
[0008] Preferably, the telescopic assembly includes two groups of first support rods, a second support rod, two groups of inclined surface blocks, two groups of card-mounted blocks, two groups of second fixed blocks, and two groups of third sliding rods. The left end and the right end of the telescopic button are respectively connected to the first support rod, the outer ends of the two groups of first support rods are respectively connected to the second support rod, the bottom ends of the two groups of second support rods are respectively connected to the inclined surface blocks, the inner ends of the two groups of second square tubes are respectively connected to the multiple groups of card-mounted through holes, the inner ends of the two groups of first square tubes are respectively provided with seventh through holes, and the two groups of seventh through holes are respectively connected to the card-mounted block sliding sets The two groups of clamping blocks are respectively slidably clamped with the clamping through holes, the tops of the two groups of clamping blocks are provided with inclined grooves, the two groups of inclined grooves are respectively slidably clamped with the inclined clamping blocks, the front ends and rear ends of the two groups of clamping blocks are respectively connected with the second fixed blocks, the left ends of the four groups of second fixed blocks are respectively provided with eighth through holes, the four groups of eighth through holes are respectively slidably fitted with the third slide rods, the inner walls of the two groups of first square tubes are respectively connected with the two groups of second fixed blocks, the inner ends of the four groups of second fixed blocks are respectively connected with the third slide rods, and the outer walls of the four groups of third slide rods are provided with third springs.
[0009] Preferably, the power-on component includes two groups of first conductive blocks and two groups of second conductive blocks, the bottom ends of the two groups of first square tubes are provided with second wire holes, the top of the protective box is provided with two groups of third wire holes, the two groups of second wire holes are connected to the third wire holes respectively, the bottom ends of the two groups of second square tubes are connected to the first conductive blocks, the bottom ends of the two groups of first tube grooves are connected to the second conductive blocks respectively, the power control button is connected to the battery through wires, the power control button is connected to the two groups of first conductive blocks through wires, and the two groups of second conductive blocks are connected to the electromagnets respectively through wires.
[0010] Preferably, the hidden plate assembly includes a hidden plate and four groups of third screws, the front end of the trolley case is provided with four groups of fixed threaded holes, the front end of the hidden plate is provided with four groups of fixed through holes, and the four groups of third screws are respectively threadedly connected with the fixed threaded holes through the fixed through holes.
[0011] Preferably, the four groups of installation through holes and the four groups of fixing through holes are all configured as countersunk holes.
[0012] Compared with the prior art, the utility model has the following beneficial effects: first, place the trolley case on the ground, then use the trolley assembly to lengthen the trolley through the telescopic assembly, when the trolley is lengthened, the two groups of first conductive blocks and the two groups of second conductive blocks are disconnected, then after the electromagnet brake assembly loses magnetism, the brake assembly is pulled away from the wheel assembly by the built-in spring, and the trolley case can be moved. If it is necessary to lock the four sets of universal wheels, the trolley assembly returns to its original position through the telescopic assembly, then the two groups of first conductive blocks and the two groups of second conductive blocks come into contact, then the power control button is pressed to energize the four groups of electromagnets, and then the four groups of electromagnets are adsorbed on the iron rotating rollers along the sliding rod, so as to manually fix the four groups of universal wheels at the bottom of the trolley case, thereby enhancing practicality. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the connection structure of the utility model;
[0014] Figure 2 It is a schematic diagram of the connection structure between the threaded sleeve and the fixed shell of the utility model;
[0015] Figure 3 It is a schematic diagram of the connection structure of two groups of second square tubes and a pull rod of the utility model;
[0016] Figure 4 It is a schematic diagram of the connection structure between the battery and the chamber of the utility model;
[0017] Figure 5 It is a schematic diagram of the threaded connection structure between the threaded sleeve and the second nut of the utility model;
[0018] Figure 6 It is a schematic diagram of the connection structure between the first fixed block and the first sliding rod of the utility model;
[0019] Figure 7 It is a schematic diagram of the cover structure of the utility model;
[0020] Figure 8 It is a schematic diagram of the enlarged structure of the A part of the utility model;
[0021] Markings in the attached drawings: 1, trolley case; 2, protective box; 3, fixed shell; 4, first screw; 5, first nut; 6, rotating roller; 7, wheel; 8, brake box; 9, clamping ring; 10, cover; 11, first fixed block; 12, first slide bar; 13, electromagnet; 14, first spring; 15, first sleeve; 16, cover plate; 17, second screw; 18, second nut; 19, first square tube; 20, second square tube; 21, pull rod; 22, power control button; 23, telescopic button; 24, second slide bar; 25, second spring; 26, battery; 27, first support rod; 28, second support rod; 29, inclined block; 30, clamping block; 31, second fixed block; 32, third slide bar; 33, third spring; 34, first conductive block; 35, second conductive block; 36, wire; 37, hidden plate; 38, third screw. DETAILED DESCRIPTION
[0022] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0023] like Figures 1 to 8As shown, a trolley case and a manually controlled universal wheel thereof of the utility model comprise a trolley case 1 and a protective box 2, a hidden plate 37 assembly is arranged at the front end of the trolley case 1, a trolley rod 21 assembly is arranged at the front side of the trolley case 1, a telescopic assembly is arranged in the trolley rod 21 assembly, the bottom end of the trolley case 1 is connected to the protective box 2, a cover plate 16 assembly is arranged at the bottom end of the protective box 2, and a universal wheel assembly is arranged at the bottom end of the cover plate 16 assembly; it is characterized in that the universal wheel assembly comprises four groups of fixed shells 3, four groups of first screws 4 and four groups of rotating rollers 6, threaded sleeves connected to bearings are arranged at the top ends of the four groups of fixed shells 3, first through holes are arranged at the left and right ends of the four groups of fixed shells 3, and the four groups of The first screws 4 pass through the two groups of first through holes respectively, the four groups of first screws 4 are respectively provided with first nuts 5, the right ends of the four groups of rotating rollers 6 are respectively provided with second through holes, the second through holes are respectively slidably fitted with the first screws 4, the four groups of rotating rollers 6 are respectively provided with two groups of fitted connected wheels 7, and the middle parts of the four groups of rotating rollers 6 are respectively provided with electromagnet 13 brake assemblies; firstly, place the trolley case on the ground, and then stretch the rod through the telescopic assembly through the rod assembly, when the rod is stretched, the two groups of first conductive blocks and the two groups of second conductive blocks are disconnected, and then after the electromagnet brake assembly loses magnetism, the brake assembly is pulled away from the wheel assembly by the built-in spring, and then the trolley case can be moved. If it is necessary to lock the four sets of universal wheels, the pull rod assembly returns to its original position through the telescopic assembly, and then the two sets of first conductive blocks and the two sets of second conductive blocks come into contact, and then the power control button is pressed to energize the four sets of electromagnets, and then the four sets of electromagnets are adsorbed on the iron rotating rollers along the sliding rod, so as to manually fix the four sets of universal wheels at the bottom of the trolley case, thereby enhancing practicality.
[0024] As a preferred embodiment of the above, the electromagnet brake assembly includes four groups of brake boxes 8, four groups of clamping rings 9, four groups of covers 10, four groups of first fixed blocks 11, eight groups of first slide bars 12 and four groups of first sleeves 15. The left ends of the four groups of brake boxes 8 are respectively provided with third through holes, and the four groups of rotating rollers 6 are respectively connected to the third through hole bearing sets, the right ends of the four groups of brake boxes 8 are provided with mounting grooves, and the right ends of the four groups of brake boxes 8 are respectively connected to the clamping rings 9, the left ends of the four groups of covers 10 are respectively provided with clamping grooves, and the four groups of clamping grooves are respectively clamped with the clamping rings 9, the left ends of the four groups of covers 10 are respectively provided with fourth through holes, and the four groups of rotating rollers 6 are respectively slidably set with the fourth through holes, the right ends of the four groups of mounting grooves are respectively connected to the first fixed blocks 11, and the tops of the four groups of first fixed blocks 11 are respectively connected to the two groups of first slide bars 12. Two groups of fifth through holes are respectively provided at the top of the four groups of electromagnets 13, and the eight groups of fifth through holes are respectively slidably fitted with the first slide bar 12, and the outer walls of the eight groups of first slide bars 12 are respectively provided with first springs 14, and the tops of the four groups of brake boxes 8 are provided with sixth through holes, and the four groups of sixth through holes are respectively fitted and connected with the first sleeves 15, and the four groups of first sleeves 15 are respectively connected to the top of the inside of the fixed shell 3, and the tops of the four groups of fixed shells 3 are respectively provided with first through wire holes; when the four groups of universal wheels are locked, the battery supplies power to the four groups of electromagnets to generate magnetic force, and then the four groups of electromagnets will be respectively adsorbed on the iron rotating rollers through the two groups of slide bars, so as to adsorb and lock the universal wheels, and then when the power is cut off, the eight groups of first springs will rebound the adsorbed electromagnets to the appropriate position, thereby enhancing practicality.
[0025] As a preferred embodiment of the above embodiment, the cover assembly includes a cover 16 and four groups of second screws 17, the bottom end of the protective box 2 is respectively provided with four groups of mounting threaded holes, the bottom end of the cover 16 is provided with four groups of mounting through holes, the four groups of second screws 17 are respectively threadedly connected with the mounting threaded holes through the mounting through holes, the bottom end of the cover 16 is provided with four groups of first through threaded holes, the four groups of first through threaded holes are respectively threadedly connected with the threaded sleeves, and the tops of the four groups of threaded sleeves are respectively provided with second nuts 18; the cover can be fixed by four groups of second screws, and the universal wheel and the cover can be threadedly connected by four groups of threaded sleeves, and then the four groups of sleeves are fixed by four groups of second nuts, thereby enhancing practicality.
[0026] As a preferred embodiment of the above embodiment, the pull rod assembly includes two groups of first square tubes 19, two groups of second square tubes 20, a pull rod 21, a power control button 22, a telescopic button 23, two groups of second sliding rods 24 and a battery 26. The front end of the pull rod box 1 is provided with a first hidden groove and a second hidden groove, and the top of the second hidden groove is provided with two groups of square through holes, which are respectively slidably mounted on the second square tubes 20. The top of the protective box 2 is connected to the two groups of first square tubes 19, and the tops of the two groups of first square tubes 19 are respectively provided with first tube grooves, which are respectively slidably mounted on the second square tubes 20, and the tops of the two groups of second square tubes 20 are respectively provided with second tube grooves. The inner wall of the pull rod 21 is provided with a chamber, and the bottom of the pull rod 21 is connected to the two groups of second square rods, and the two groups of second tube grooves They are respectively connected to the first tube groove and the chamber, the bottom end of the chamber is connected to the power control button 22, the button on the power control button 22 slides out of the bottom end of the pull rod 21, the left and right ends of the telescopic button 23 are respectively connected to the telescopic component, the bottom end of the telescopic button 23 is provided with two groups of slide slot holes, the two groups of slide slot holes are respectively slidably fitted with the second slide rod 24, the outer walls of the two groups of second slide rods 24 are respectively provided with second springs 25, the bottom ends of the chambers are respectively connected to the batteries 26, the front ends of the batteries 26 are provided with charging holes, the front ends of the pull rod 21 are provided with penetrating charging holes, and the two groups of first tube grooves are provided with power-on components; when the trolley case needs to be moved, by A), the telescopic button is pressed to disconnect the power supply and release the magnetism, so that the brake component is demagnetized and then pulled away by the wheel group spring to release the buckle of the wheel axle. B), pull up the telescopic rod (i.e. the pull rod), disconnect the conduction, thereby lengthening the second square tube, and then the two groups of first conductive blocks and second conductive blocks will be released, thereby cutting off the power to the four groups of electromagnets, and the power supply of the battery will be released by pressing the power control button, and then the trolley case can be moved by pulling the pull rod, thereby enhancing practicality.
[0027] As a preferred embodiment of the above embodiment, the telescopic assembly includes two groups of first support rods 27, second support rods 28, two groups of inclined surface blocks 29, two groups of card-mounting blocks 30, two groups of second fixed blocks 31, and two groups of third sliding rods 32. The left and right ends of the telescopic button 23 are respectively connected to the first support rod 27, the outer ends of the two groups of first support rods 27 are respectively connected to the second support rod 28, the bottom ends of the two groups of second support rods 28 are respectively connected to the inclined surface blocks 29, the inner ends of the two groups of second square tubes 20 are respectively connected to multiple groups of card-mounting through holes, the inner ends of the two groups of first square tubes 19 are respectively provided with seventh through holes, the two groups of seventh through holes are respectively slidably fitted with the card-mounting blocks 30, the two groups of card-mounting blocks 30 are respectively slidably fitted with the card-mounting through holes, the top ends of the two groups of card-mounting blocks 30 are provided with inclined surface grooves, the two groups of inclined surface grooves are respectively slidably fitted with the inclined surface blocks 29, the front and rear ends of the two groups of card-mounting blocks 30 are respectively connected to the second fixed blocks 31, and the left ends of the four groups of second fixed blocks 31 are respectively An eighth through hole is provided, and four groups of eighth through holes are respectively slidably fitted with the third sliding rod 32, the inner walls of the two groups of first square tubes 19 are respectively connected to the two groups of second fixing blocks 31, the inner ends of the four groups of second fixing blocks 31 are respectively connected to the third sliding rod 32, and the outer walls of the four groups of third sliding rods 32 are provided with a third spring 33; when the telescopic button is pressed, the telescopic button moves downward along the two groups of second sliding rods, thereby driving the two groups of second support rods and the two groups of inclined surface blocks to move downward, thereby pushing the card-mounting block to move outward through the two groups of inclined surface blocks, and then pulling the pull rod upward, and then the pull rod drives the two groups of second square tubes to move upward, and then release the telescopic button, and then the two groups of second springs will drive the telescopic button to move upward, and the two groups of third springs will drive the second fixing block to rebound, thereby driving the two groups of card-mounting blocks to card and fix the through-card holes on the two groups of first square tubes, thereby lengthening the pull rod, facilitating the movement of the trolley case, thereby enhancing practicality.
[0028] As a preferred embodiment of the above embodiment, the power-on component includes two groups of first conductive blocks 34 and two groups of second conductive blocks 35. The bottom ends of the two groups of first square tubes 19 are provided with second wire holes, and the top of the protective box 2 is provided with two groups of third wire holes, the two groups of second wire holes are connected to the third wire holes respectively, the bottom ends of the two groups of second square tubes 20 are connected to the first conductive blocks 34, and the bottom ends of the two groups of first tube grooves are connected to the second conductive blocks 35 respectively. The power control button 22 is connected to the battery 26 through the wire 36, the power control button 22 is connected to the two groups of first conductive blocks 34 through the wire 36, and the two groups of second conductive blocks 35 are respectively connected to the electromagnet 13 through the wire 36; the battery and the electromagnet can be electrically conductive through the two groups of first conductive platforms and the two groups of second conductive platforms, thereby enhancing practicality.
[0029] As a preferred embodiment of the above embodiment, the hidden plate 37 assembly includes a hidden plate 37 and four groups of third screws 38. The front end of the trolley case 1 is provided with four groups of fixed threaded holes, and the front end of the hidden plate 37 is provided with four groups of fixed through holes. The four groups of third screws 38 are respectively threadedly connected with the fixed threaded holes through the fixed through holes; the hidden plate can be installed by using the four groups of third screws, so that the first square tube and the second square tube can be hidden by the hidden plate, thereby enhancing practicality.
[0030] As a preference of the above embodiment, the four groups of installation through holes and the four groups of fixing through holes are all configured as countersunk holes; the four groups of second screws and the four groups of third screws can be hidden through the countersunk holes, thereby enhancing practicality.
[0031] The utility model provides a trolley case and its manually controlled universal wheel, and its working principle is as follows: when working, firstly, the trolley case is placed on the ground, and then by pressing the telescopic button, the telescopic button moves downward along the two groups of second sliding rods, thereby driving the two groups of second supporting rods and the two groups of inclined surface clamping blocks to move downward, thereby pushing the clamping blocks to move outward through the two groups of inclined surface clamping blocks, and then pulling the pull rod upward, and then the pull rod drives the two groups of second square tubes to move upward, and then release the telescopic button, and then the two groups of second springs will drive the telescopic button to move upward, and the two groups of third springs will drive the second fixing blocks to rebound, thereby driving the two groups of clamping blocks to clamp and fix the penetrating clamping holes on the two groups of first square tubes, thereby lengthening the pull rod, facilitating the movement of the trolley case, and When the pull rod is extended, the two groups of first conductive blocks are released from contact with the two groups of second conductive blocks, and then the electromagnet releases the adsorption of the rotating roller, and the four groups of electromagnets are rebounded by the first spring, and then the trolley case can be moved. When it is necessary to lock the four groups of universal wheels, press the telescopic button to insert the second square tube into the bottom of the first square tube, and then the two groups of first conductive blocks are contacted with the two groups of second conductive blocks, and then the power control button is pressed to energize the four groups of electromagnets, and then the four groups of electromagnets are adsorbed on the iron rotating roller along the sliding rod, so as to manually fix the four groups of universal wheels at the bottom of the trolley case. When it is not necessary to lock the universal wheels of the trolley case, press the power control button to contact the battery for power supply, and then the trolley case can be pushed to move.
[0032] The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
[0033] The “first”, “second” and “third” mentioned in the present invention do not represent specific quantities and orders, but are merely used to distinguish names.
[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.
Claims
1. A trolley case and a manually controlled universal wheel thereof, comprising a trolley case (1) and a protective box (2), wherein a hidden plate (37) assembly is arranged at the front end of the trolley case (1), a rod (21) assembly is arranged at the front side of the trolley case (1), a telescopic assembly is arranged in the rod (21) assembly, the bottom end of the trolley case (1) is connected to the protective box (2), a cover plate (16) assembly is arranged at the bottom end of the protective box (2), and a universal wheel assembly is arranged at the bottom end of the cover plate (16); characterized in that: The universal wheel assembly comprises four groups of fixed shells (3), four groups of first screws (4) and four groups of rotating rollers (6). The top ends of the four groups of fixed shells (3) are provided with threaded sleeves connected to bearings. The left and right ends of the four groups of fixed shells (3) are respectively provided with first through holes. The four groups of first screws (4) pass through the two groups of first through holes respectively. The four groups of first screws (4) are respectively provided with first nuts (5). The right ends of the four groups of rotating rollers (6) are respectively provided with second through holes. The second through holes are respectively slidably fitted with the first screws (4). The four groups of rotating rollers (6) are respectively provided with two groups of wheels (7) fitted and connected. The middle parts of the four groups of rotating rollers (6) are respectively provided with electromagnet (13) brake assemblies.
2. A trolley case and a manually controlled universal wheel thereof as claimed in claim 1, characterized in that: The electromagnet (13) brake assembly comprises four groups of brake boxes (8), four groups of clamping rings (9), four groups of covers (10), four groups of first fixed blocks (11), eight groups of first slide bars (12) and four groups of first sleeves (15). The left ends of the four groups of brake boxes (8) are respectively provided with third through holes, the four groups of rotating rollers (6) are respectively connected to the third through hole bearing sets, the right ends of the four groups of brake boxes (8) are respectively provided with mounting grooves, the right ends of the four groups of brake boxes (8) are respectively connected to the clamping rings (9), the left ends of the four groups of covers (10) are respectively provided with clamping grooves, the four groups of clamping grooves are respectively clamped with the clamping rings (9), the left ends of the four groups of covers (10) are respectively provided with fourth through holes, the four groups of rotating rollers (6) are respectively connected to the third through hole bearing sets, The fourth through hole sliding set, the right ends of the four groups of mounting grooves are respectively connected to the first fixed block (11), the tops of the four groups of first fixed blocks (11) are respectively connected to the two groups of first slide bars (12), the tops of the four groups of electromagnets (13) are respectively provided with two groups of fifth through holes, the eight groups of fifth through holes are respectively slidably set with the first slide bars (12), the outer walls of the eight groups of first slide bars (12) are respectively provided with first springs (14), the tops of the four groups of brake boxes (8) are provided with sixth through holes, the four groups of sixth through holes are respectively set and connected with the first sleeves (15), the four groups of first sleeves (15) are respectively connected to the tops inside the fixed shell (3), and the tops of the four groups of fixed shells (3) are respectively provided with first through line holes.
3. A trolley case and a manually controlled universal wheel thereof as claimed in claim 2, characterized in that: The cover plate (16) assembly includes a cover plate (16) and four groups of second screws (17), the bottom end of the protective box (2) is respectively provided with four groups of mounting threaded holes, the bottom end of the cover plate (16) is provided with four groups of mounting through holes, the four groups of second screws (17) are respectively threadedly connected to the mounting threaded holes through the mounting through holes, the bottom end of the cover plate (16) is provided with four groups of first through threaded holes, the four groups of first through threaded holes are respectively threadedly connected to the threaded sleeves, and the tops of the four groups of threaded sleeves are respectively provided with second nuts (18).
4. A trolley case and a manually controlled universal wheel thereof as claimed in claim 3, characterized in that: The pull rod (21) assembly comprises two groups of first square tubes (19), two groups of second square tubes (20), a pull rod (21), a power control button (22), a telescopic button (23), two groups of second sliding rods (24) and a battery (26). The front end of the pull rod box (1) is provided with a first hidden groove and a second hidden groove. The top of the second hidden groove is provided with two groups of square through holes. The two groups of square through holes are respectively slidably mounted with the second square tubes (20). The top of the protective box (2) is connected to the two groups of first square tubes (19). The tops of the two groups of first square tubes (19) are respectively provided with a first tube groove. The two groups of first tube grooves are respectively slidably mounted with the second square tubes (20). The tops of the two groups of second square tubes (20) are respectively provided with a second tube groove. The inner wall of the pull rod (21) is provided with A chamber is arranged, the bottom of the pull rod (21) is connected to two groups of second square rods, the two groups of second tube grooves are respectively connected to the first tube groove and the chamber, the bottom end of the chamber is connected to the power control button (22), the button on the power control button (22) slides out of the bottom end of the pull rod (21), the left end and the right end of the telescopic button (23) are respectively connected to the telescopic component, the bottom end of the telescopic button (23) is provided with two groups of slide slot holes, the two groups of slide slot holes are respectively slidably mounted with the second slide rod (24), the outer walls of the two groups of second slide rods (24) are respectively provided with second springs (25), the bottom end of the chamber is respectively connected to the battery (26), the front end of the battery (26) is provided with a charging hole, the front end of the pull rod (21) is provided with a through charging hole, and the two groups of first tube grooves are provided with power supply components.
5. A trolley case and a manually controlled universal wheel thereof as claimed in claim 4, characterized in that: The telescopic assembly comprises two groups of first support rods (27), second support rods (28), two groups of inclined surface blocks (29), two groups of clamping blocks (30), two groups of second fixed blocks (31), and two groups of third sliding rods (32). The left end and the right end of the telescopic button (23) are respectively connected to the first support rod (27), the outer ends of the two groups of first support rods (27) are respectively connected to the second support rod (28), the bottom ends of the two groups of second support rods (28) are respectively connected to the inclined surface blocks (29), the inner ends of the two groups of second square tubes (20) are respectively connected to the plurality of groups of clamping through holes, the inner ends of the two groups of first square tubes (19) are respectively provided with seventh through holes, and the two groups of seventh through holes are respectively connected to the sliding blocks (30) The two groups of clamping blocks (30) are respectively slidably clamped with the clamping through holes, the top ends of the two groups of clamping blocks (30) are provided with inclined grooves, the two groups of inclined grooves are respectively slidably clamped with the inclined clamping blocks (29), the front ends and rear ends of the two groups of clamping blocks (30) are respectively connected to the second fixed blocks (31), the left ends of the four groups of second fixed blocks (31) are respectively provided with eighth through holes, the four groups of eighth through holes are respectively slidably clamped with the third slide bars (32), the inner walls of the two groups of first square tubes (19) are respectively connected to the two groups of second fixed blocks (31), the inner ends of the four groups of second fixed blocks (31) are respectively connected to the third slide bars (32), and the outer walls of the four groups of third slide bars (32) are provided with third springs (33).
6. A trolley case and a manually controlled universal wheel thereof as claimed in claim 5, characterized in that: The power supply assembly comprises two groups of first conductive blocks (34) and two groups of second conductive blocks (35). The bottom ends of the two groups of first square tubes (19) are provided with second wire holes. The top end of the protective box (2) is provided with two groups of third wire holes. The two groups of second wire holes are respectively connected to the third wire holes. The bottom ends of the two groups of second square tubes (20) are connected to the first conductive blocks (34). The bottom ends of the two groups of first tube grooves are respectively connected to the second conductive blocks (35). The power control button (22) is connected to the battery (26) through a wire (36). The power control button (22) is connected to the two groups of first conductive blocks (34) through a wire (36). The two groups of second conductive blocks (35) are respectively connected to the electromagnet (13) through a wire (36).
7. A trolley case and a manually controlled universal wheel thereof as claimed in claim 6, characterized in that: The hidden plate (37) assembly comprises a hidden plate (37) and four groups of third screws (38); the front end of the trolley case (1) is provided with four groups of fixing threaded holes; the front end of the hidden plate (37) is provided with four groups of fixing through holes; the four groups of third screws (38) are respectively threadedly connected with the fixing threaded holes through the fixing through holes.
8. A trolley case and a manually controlled universal wheel thereof as claimed in claim 7, characterized in that: The four groups of installation through holes and the four groups of fixing through holes are all configured as countersunk holes.