Simple quick-release device for land wheel and folding bicycle

Abstract

The utility model provides a simple quick release device for a land wheel, which comprises an outer sleeve, a pin sleeve and a pin shaft, the pin sleeve is axially sleeved with the outer sleeve, the pin sleeve is axially provided with a through hole and a moving part, the moving part is transversely and eccentrically provided with a sleeving hole relative to the through hole, and the moving part and the pin sleeve are integrally formed and are connected through an elastic part. An inserting head with a limiting groove is arranged at the top of the pin shaft, when the inserting head is inserted into the sleeving hole, the matching surface pushes the moving part to transversely move, the elastic part accumulates elastic force, and when the limiting groove completely reaches the sleeving hole subsequently, the moving part moves back under the action of the elastic part, so that the side wall part is partially clamped into the limiting groove, and the land wheel is quickly assembled; when the pressing part is pressed to enable the side wall part to retreat from the limiting groove, the land wheel can be quickly disassembled; the simple quick release device for the land wheel is convenient to produce and manufacture, is beneficial to reducing the cost, and realizes quick release / quick assembly; the utility model further provides a folding bicycle which adopts the simple and quick release device for the land wheel.

Description

TECHNICAL FIELD

[0001] The utility model relates to a car technical field, specifically is a ground wheel simple quick release device and folding car. BACKGROUND

[0002] In daily life, small trailers, barrows and the like used for carrying objects are very important tools, and in particular in outdoor leisure activities, ground wheels are usually provided for ease of use.

[0003] However, the connection of the ground wheel and the vehicle still needs to use a spring or the like to achieve a certain detachable structure, which is not only high in cost and relatively complex in production and manufacturing, but also slow in disassembly and assembly, and therefore needs to be further improved. The present applicant will propose a ground wheel simple quick release device, which is not only convenient for production and manufacturing and conducive to cost reduction, but also achieves quick disassembly and assembly. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art, provide a ground wheel simple quick release device, which is not only convenient for production and manufacturing and conducive to cost reduction, but also achieves quick disassembly and assembly; and propose a folding car using the aforementioned ground wheel simple quick release device.

[0005] To solve the above technical problems, the utility model provides a ground wheel simple quick release device, which comprises,

[0006] The outer sleeve is fixedly arranged on the vehicle.

[0007] The pin sleeve is made of plastic, the outer sleeve axially covers the pin sleeve, the pin sleeve is axially provided with a through hole, the two ends of the through hole are respectively an insertion end and an outlet end from bottom to top, a moving part is transversely arranged at the outlet end, the moving part is transversely eccentrically provided with a sleeve joint hole relative to the through hole, the moving part is integrally formed with the pin sleeve and is connected through an elastic part; the outer sleeve is provided with a window, the pressing part of the moving part protrudes outward of the window in an initial state to expose the pressing part, when the pressing part is pressed or released, the sleeve joint hole and the through hole are switched between concentric and eccentric positions, and the elastic part accumulates or releases elastic force, so as to unlock or limit the pin shaft;

[0008] The pin shaft is arranged on the top of the wheel yoke of the ground wheel, and the through hole is detachably sleeved with the pin shaft. The top of the pin shaft is provided with an insertion head, and the lower side of the insertion head is provided with a limiting groove. The pin shaft is inserted into the through hole from the insertion end, and the insertion head is extended from the outlet end and further inserted into the sleeving hole. A matching surface is arranged between the insertion head and the sleeving hole, and the matching surface is arranged on the insertion head. When the insertion head is inserted into the sleeving hole, the matching surface pushes the moving part to move transversely. The elastic part accumulates elastic force. When the limiting groove is completely reached, the matching surface is separated from the sleeving hole to make the moving part move back under the action of the elastic part. Then, the side wall part of the sleeving hole is clamped into the limiting groove to axially limit the pin shaft to achieve quick installation of the ground wheel. When the sleeving hole is in the unlocked position, the side wall part is out of the limiting groove, and the insertion head can be pulled out or gravity dropped out from the sleeving hole in the reverse direction to make the pin shaft separate from the pin sleeve to quickly disassemble the ground wheel.

[0009] As an improvement, plastic elastic parts are arranged on the left and right sides or the front and back sides of the moving part along the moving direction of the moving part.

[0010] As an improvement, the pin sleeve is made of high-elasticity and high-hardness engineering plastic.

[0011] As an improvement, one or more plastic elastic parts are arranged on the left and right sides of the moving part, and a support part is formed by tilting towards the pressing part, or one or more plastic elastic parts are arranged on the front and back sides of the moving part, and a support part is formed by tilting towards the pressing part.

[0012] As an improvement, the part of the pin shaft located in the limiting groove is a cylindrical rod, and the sleeving hole is provided with an arc concave surface matched with the cylindrical rod. When the sleeving hole is in the limiting position, the arc concave surface is transversely matched with the cylindrical rod.

[0013] As an improvement, the transverse peripheral dimension of the pin sleeve and the moving part is smaller than the transverse inner peripheral dimension of the outer sleeve tube; and the cross section of the pin sleeve and the outer sleeve tube is a circular or polygonal or D-shaped or elliptical or flat elliptical tubular body.

[0014] As an improvement, when the pin sleeve is axially sleeved with the outer sleeve tube, the pin sleeve is inserted into the outer sleeve tube from the lower end of the outer sleeve tube. During the insertion process, the inner side wall of the outer sleeve tube pushes back the pressing part to make the pin sleeve insertable into the outer sleeve tube. When the pressing part reaches the window, the pressing part extends out of the window under the action of the elastic part.

[0015] As an improvement, the stroke of the pressing part is set as follows: when the sleeving hole is in the unlocked position, the pressing part is still matched with the window to axially limit the pin sleeve.

[0016] As an improvement, the outer sleeve is provided with a limiting hole, the outer periphery of the pin sleeve is provided with a limiting boss at the position corresponding to the limiting hole, and the limiting boss and the limiting hole are in blocking and limiting cooperation; and / or, the outer sleeve is provided with an inwardly inclined elastic limiting part, the outer periphery of the pin sleeve is provided with a matching groove or hole at the position corresponding to the elastic limiting part, and the elastic limiting part and the matching groove or hole are in blocking and limiting cooperation; and / or, further comprising a screw, the outer periphery of the pin sleeve is provided with a connecting hole at the position corresponding to the limiting hole, and the screw is connected through the limiting hole and the connecting hole to fix the outer sleeve and the pin sleeve.

[0017] As an improvement, the lower end of the pin sleeve is provided with a circumferential protrusion, when the limiting boss and the limiting hole are in blocking and limiting cooperation, the circumferential protrusion is in contact with the lower end surface of the outer sleeve to limit the axial direction, or when the elastic limiting part and the matching groove or hole are in blocking and limiting cooperation, the circumferential protrusion is in contact with the lower end surface of the outer sleeve to limit the axial direction, or when the screw is connected through the limiting hole and the connecting hole to fix the outer sleeve and the pin sleeve, the circumferential protrusion is in contact with the lower end surface of the outer sleeve to limit the axial direction.

[0018] As an improvement, the insertion head is provided as a conical or circular truncated cone or cylindrical head, the side surface of the conical head or the side surface of the circular truncated cone or the arc surface of the cylindrical head serves as the matching surface, and for the case of the cylindrical head, the sleeve hole is correspondingly provided with an inclined surface.

[0019] As an improvement, the inner side wall of the sleeve hole is an inclined surface from the lower end of the sleeve hole upward by more than half, and the inclined surface is reversely arranged relative to the pressing part of the moving part.

[0020] As an improvement, the pin shaft and the pin sleeve are in rotatable matching relationship or non-rotatable fixed matching relationship.

[0021] As an improvement, the rotatable matching relationship is a sleeve matching relationship with a circular cross section, and the non-rotatable fixed matching relationship is a sleeve matching relationship with a polygonal or D-shaped or elliptical or flat elliptical cross section or one or more than one key groove limiting matching relationship.

[0022] As an improvement, the lower end of the pin shaft is vertically fixedly arranged at the middle part of the cross shoulder of the fork.

[0023] Compared with the prior art, the utility model has the advantages that the utility model does not need complex structure such as spring, mainly comprises outer sleeve, pin sleeve and pin shaft, the outer sleeve is a sleeve, and the pin sleeve is plastic material, so plastic integrated molding can be used to manufacture, the pin shaft can be metal, plastic or other material, metal and plastic can use integrated molding technology to obtain the pin shaft, so it is very convenient and efficient to manufacture the outer sleeve, pin sleeve and pin shaft, which is favorable for reducing cost, through the additional improvement of the pin sleeve and pin shaft, the pin sleeve is inserted into the outer sleeve to form the first assembly with the outer sleeve during assembly, so it is favorable for simplifying assembly and improving assembly efficiency, thereby further reducing cost.

[0024] Since the outer sleeve is fixedly arranged on the vehicle, the pin sleeve is fixedly arranged on the vehicle after being inserted into the outer sleeve, when fast assembly is needed, the pin shaft on the ground wheel is inserted into the pin sleeve to complete fast assembly, when fast disassembly is needed, the pressing portion on the pin sleeve is pressed to be unlocked, so that the ground wheel is fast disassembled.

[0025] In summary, the utility model is convenient to produce and manufacture, favorable for reducing cost, and realizes fast disassembly / fast assembly. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a perspective view of a folding vehicle of the utility model.

[0027] Figure 2 It is an enlarged perspective view of A.

[0028] Figure 3 It is an exploded view of a simple fast disassembly device of a ground wheel of embodiment one.

[0029] Figure 4 It is a perspective view of a simple fast disassembly device of a ground wheel of embodiment one.

[0030] Figure 5 It is a front view of a simple fast disassembly device of a ground wheel of embodiment one.

[0031] Figure 6 It is an A-A sectional view.

[0032] Figure 7 It is an exploded view of a simple fast disassembly device of a ground wheel of embodiment two.

[0033] Figure 8 It is a perspective view of a simple fast disassembly device of a ground wheel of embodiment two.

[0034] Figure 9 It is a front view of a simple fast disassembly device of a ground wheel of embodiment two.

[0035] Figure 10 It is a B-B sectional view.

[0036] Figure 11 An exploded view of a simple quick release device for a ground wheel according to example three.

[0037] Figure 12 A perspective view of a simple quick release device for a ground wheel according to example three.

[0038] Figure 13 A front view of a simple quick release device for a ground wheel according to example three.

[0039] Figure 14 A cross-sectional view in the direction of C-C.

[0040] Figure 15 An exploded view of a simple quick release device for a ground wheel according to example four.

[0041] Figure 16 A perspective view of a simple quick release device for a ground wheel according to example four.

[0042] Figure 17 A front view of a simple quick release device for a ground wheel according to example four.

[0043] Figure 18 A cross-sectional view in the direction of D-D.

[0044] Figure 19 An enlarged perspective view of B.

[0045] Figure 20 A perspective view of another folding vehicle according to the present disclosure.

[0046] As shown in the drawings, 1, outer sleeve, 2, pin sleeve, 3, through hole, 4, moving part, 5, sleeve hole, 6, elastic part, 7, window, 8, pressing part, 9, pin shaft, 10, ground wheel, 11, wheel fork, 12, insertion head, 13, limiting groove, 14, matching surface, 15, side wall part, 16, cylindrical rod, 17, circular arc concave surface, 18, limiting hole, 19, limiting boss, 20, inclined surface, 21, universal wheel, 22, directional wheel, 23, front frame, 24, rear frame, 25, side rod, 26, bottom cross beam, 27, transverse through slot or hole, 28, screw, 29, connecting hole, 30, circumferential protrusion, 31, elastic limiting part, 32, matching slot or hole, 33, middle bottom cross beam. DETAILED DESCRIPTION

[0047] The following description is provided to enable any person skilled in the art to practice the present disclosure as claimed. Stated examples in the following description are provided as examples only and are not intended to be limiting. The following description defines in general terms the principles of the present disclosure and its application. The present disclosure can be applied to other embodiments, variations, modifications, equivalents, and other technical solutions that do not depart from the spirit and scope of the present disclosure.

[0048] Those skilled in the art should understand that in the disclosure of the utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation on the utility model.

[0049] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0050] As shown in Figures 1 to 19 It is a simple and quick dismounting device for a ground wheel, which comprises an outer sleeve 1, a pin sleeve 2 and a pin shaft 9.

[0051] As shown in Figure 1 , 2 The outer sleeve 1 is fixedly arranged on the vehicle, and the outer sleeve 1 is a sleeve, in this example, two outer sleeves 1 are arranged on the bottom cross beam 26 of the front frame 23, and the lower sections of the two side rods 25 of the rear frame 24 are respectively used as an outer sleeve 1.

[0052] Of course, other structures can also be used, for example, the outer sleeve 1 is arranged on the bottom cross beam 26 of the rear frame 24, and for example, the lower section of the side rod 25 of the front frame 23 of the folding vehicle is used as the outer sleeve 1.

[0053] The pin sleeve 2 is made of plastic, preferably integrally formed of plastic, so as to facilitate production and manufacturing and obtain the plastic elastic part 6 at the same time, that is, the elastic part 6 is provided with elasticity by the plastic material. The outer sleeve 1 axially sleeves the pin sleeve 2, the pin sleeve 2 is axially provided with a through hole 3, the two ends of the through hole 3 are respectively an insertion end and an outlet end from bottom to top, a moving part 4 is transversely arranged at the outlet end, the moving part 4 is transversely eccentric with respect to the through hole 3 and is provided with a sleeving hole 5, the moving part 4 is integrally formed with the pin sleeve 2 and is connected through the elastic part 6; the outer sleeve 1 is provided with a window 7, a pressing part 8 of the moving part 4 protrudes outward of the window 7 in an initial state to expose the pressing part 8, when the pressing part 8 is pressed / loosened, the sleeving hole 5 and the through hole 3 are switched between concentric / eccentric positions, and the elastic part 6 accumulates or releases elastic force, so as to unlock / limit the following pin shaft 9;

[0054] The pin shaft 9 is arranged on the top of the wheel fork 11 of the ground wheel 10, and the through hole 3 is detachably sleeved with the pin shaft 9. The top of the pin shaft 9 is provided with an insertion head 12, and the lower side of the insertion head 12 is provided with a limiting groove 13. The pin shaft 9 is inserted into the through hole 3 through the insertion head 12 from the insertion end, and the insertion head 12 is extended from the outlet end and further inserted into the sleeving hole 5. A matching surface 14 is arranged between the insertion head 12 and the sleeving hole 5, and the matching surface 14 is arranged on the insertion head 12. When the insertion head 12 is inserted into the sleeving hole 5, the moving part 4 is pushed by the matching surface 14 to move transversely, and the plastic elastic part 6 accumulates elastic force. When the limiting groove 13 is completely reached in the sleeving hole 5, the matching surface 14 is separated from the sleeving hole 5 to make the moving part 4 move back under the action of the plastic elastic part 6, and then the side wall part 15 of the sleeving hole 5 is clamped into the limiting groove 13 to axially limit the pin shaft 9 to achieve the quick installation of the ground wheel 10. When it is necessary to unlock, the pressing part 8 is pressed first to make the side wall part 15 exit the limiting groove 13, so that the sleeving hole 5 is in an unlocked position relative to the limiting groove 13. At this time, the insertion head 12 can be pulled out or gravity dropped out from the sleeving hole 5 in reverse to make the pin shaft 9 separate from the pin sleeve 2 to achieve the quick disassembly of the ground wheel 10.

[0055] The pin sleeve 2 is inserted into the outer sleeve 1 to form a first assembly with the outer sleeve 1.

[0056] When the pin sleeve 2 is axially sleeved with the outer sleeve 1, the pin sleeve 2 is inserted into the outer sleeve 1 from the lower end of the outer sleeve 1. During the insertion process, the inner side wall of the outer sleeve 1 pushes back the pressing part 8 to make the pin sleeve 2 inserted into the outer sleeve 1. When the pressing part 8 reaches the window 7, the pressing part 8 is extended out of the window 7 under the action of the plastic elastic part 6. In this way, the elastic action of the plastic elastic part 6 and the pushing back action of the inner side wall of the outer sleeve 1 are utilized to achieve convenient assembly, which is conducive to quickly achieving the sleeving installation of the outer sleeve 1 and the pin sleeve 2, thereby reducing the cost.

[0057] The pin sleeve 2 is made of high-elasticity and high-hardness engineering plastic, such as polyoxymethylene POM, or polycarbonate PC, or polyether ether ketone PEEK, etc.

[0058] In some embodiments, as shown in FIG. 2, the plastic elastic parts 6 are arranged on the left and right sides along the moving direction of the moving part 4. In this way, stable support is provided, and the durability is high during repeated use, which is conducive to improving the reliability. Figure 3

[0059] Of course, other structures can also be used, for example, as shown in FIG. 3, the plastic elastic parts 6 are arranged on the front and back sides along the moving direction of the moving part 4. Figure 11

[0060] As shown in FIG. 4, the plastic elastic part 6 is arranged on the front side along the moving direction of the moving part 4. Figure 3 ​​As shown, one or more plastic elastic parts 6 can be provided on the left and right sides of the moving part 4, and they are inclined towards the pressing part 8 to form a support part. In this example, two parts are provided, with a total of four parts on the left and right sides.

[0061] And such Figure 11 , 14 As shown, the plastic elastic part 6 is provided on the front and rear sides of the moving part 4 respectively, and is inclined towards the pressing part 8 to form a support part. Of course, there can be more than one.

[0062] The inclined support portion is advantageous in two ways: firstly, it causes the pressing portion 8 of the moving portion 4 to protrude outward from the window 7 in the initial state to expose the pressing portion 8; secondly, it provides better reset force and directionality during reset, thus improving reliability and user comfort.

[0063] In some embodiments, such as Figure 3 As shown, the portion of the pin 9 located in the limiting groove 13 is a cylindrical rod 16. The sleeve hole 5 has an arc-shaped concave surface 17 that mates with the cylindrical rod 16. When the sleeve hole 5 is in the limiting position, the arc-shaped concave surface 17 mates laterally with the cylindrical rod 16. This facilitates the rotation of the pin 9, thus making it suitable for use in casters.

[0064] In some embodiments, the lateral circumferential dimension of the pin sleeve 2 and the movable part 4 is smaller than the lateral inner circumferential dimension of the outer sleeve 1; the cross-section of the pin sleeve 2 and the outer sleeve 1 that fits into the sleeve is a tubular body with a circular, polygonal, D-shaped, elliptical, or flat elliptical cross-section. This makes it easier to fit the pin sleeve 2 and the movable part 4 into the outer sleeve 1, and the shape of the outer sleeve 1 can be of various structures, such as a tubular body with a circular, polygonal, D-shaped, elliptical, or flat elliptical cross-section.

[0065] In some embodiments, such as Figure 6 As shown, the stroke of the pressing part 8 is set such that when the socket 5 is in the unlocked position, the pressing part 8 still cooperates with the window 7 to axially limit the pin sleeve 2. In this way, the pin sleeve 2 and the outer sleeve 1 are not easily separated during unlocking.

[0066] Furthermore, such as Figure 6 As shown, the outer sleeve 1 has a limiting hole 18 around its periphery, and the pin sleeve 2 has a limiting boss 19 at the corresponding position of the limiting hole 18 on its outer periphery. The limiting boss 19 engages with the limiting hole 18 to axially limit the outer sleeve 1 and the pin sleeve 2. To facilitate insertion, the portion containing the limiting boss 19 has a transverse through groove or hole 27, or rectangular slot, providing elastic clearance for the limiting boss 19. This makes the connection between the pin sleeve 2 and the outer sleeve 1 more secure and provides better durability during long-term use.

[0067] Of course, other structures are also possible, for example, as shown in Figure 10 , the outer sleeve 1 is provided with an elastic limiting portion 31 inclined inwardly, and the outer periphery of the pin sleeve 2 is provided with a matching groove or hole 32 at a position corresponding to the elastic limiting portion 31, the elastic limiting portion 31 and the matching groove or hole 32 are in blocking and limiting cooperation to axially limit the outer sleeve 1 and the pin sleeve 2; for example, as shown in Figure 14 , it also includes a screw 28, the outer periphery of the pin sleeve 2 is provided with a connecting hole 29 at a position corresponding to the limiting hole 18, and the screw 28 is connected through the limiting hole 18 and the connecting hole 29 to fix the outer sleeve 1 and the pin sleeve 2.

[0068] Further, as shown in Figure 3 , 4 , 5, 6, the lower end of the pin sleeve 2 is provided with a circumferential protrusion 30, when the limiting boss 19 and the limiting hole 18 are in blocking and limiting cooperation, the circumferential protrusion 30 is attached to the lower end surface of the outer sleeve 1 to axially limit. In this way, on the one hand, after the outer sleeve 1 and the pin sleeve 2 are fixed by mutual sleeving, they will not be loose, even in long-term use, they also have good axial limiting performance, on the other hand, if the circumferential protrusion 30 is formed in a ring, then the lower end of the outer sleeve 1 is closed, thereby avoiding dirt from entering.

[0069] Similarly, as shown in Figure 7 , 8 , 9, 10, when the elastic limiting portion 31 and the matching groove or hole 32 are in blocking and limiting cooperation, the circumferential protrusion 30 is attached to the lower end surface of the outer sleeve 1 to axially limit; as shown in Figure 11 , 12 , 13, 14, when the screw 28 is connected through the limiting hole 18 and the connecting hole 29 to fix the outer sleeve 1 and the pin sleeve 2, the circumferential protrusion 30 is attached to the lower end surface of the outer sleeve 1 to axially limit.

[0070] In some embodiments, as shown in Figure 6 , the insertion head 12 is provided as a cone or a circular truncated cone, and the side surface of the cone or the side surface of the circular truncated cone serves as the matching surface 14. In this way, it is beneficial for the pin shaft 9 to be inserted into the sleeving hole 5 through the insertion head 12 and smoothly push the moving portion 4, thereby improving the user experience.

[0071] Other structures are also possible, for example, as shown in Figure 15 , 16 , 17, 18, 19, the insertion head 12 is provided as a cylindrical head, the sleeving hole 5 is correspondingly provided with an inclined surface 20, and the cylindrical head pushes the moving portion 4 through the inclined surface 20, so the surface of the cylindrical head in contact with the inclined surface 20 serves as the matching surface 14.

[0072] In the case of the inclined surface 20, furthermore, at least half of the inner sidewall of the socket 5 from the lower end of the socket 5 upwards is inclined surface 20, and this inclined surface 20 is arranged opposite to the pressing part 8 of the moving part 4. In this way, when the cylindrical head pushes the moving part 4 through the inclined surface 20, the moving part 4 moves a sufficient stroke to ensure that the insertion head 12 can pass through the socket 5, thereby causing the sidewall part 15 to be engaged in the limiting groove 13.

[0073] The pin 9 and the pin sleeve 2 are configured to be either rotatable or fixed. In this way, the rotatable type can be used to install the caster 21, and the fixed type can be used to install the directional wheel 22.

[0074] The rotatable fit relationship is a socket fit relationship with a circular cross-section, and the non-rotatable fixed fit relationship is a socket fit relationship with a polygonal, D-shaped, elliptical, or flat elliptical cross-section, or it can be a fit relationship with one or more keyways limiting the fit.

[0075] This disclosure also proposes a folding vehicle, including four ground wheels 10. The four ground wheels 10 are equipped with the aforementioned quick-release ground wheel device and are arranged in three ways: two front universal wheels 21 and two rear fixed wheels 22, or two rear universal wheels 21 and two front fixed wheels 22, or two front universal wheels 21 and two rear universal wheels 21. The axle pin of the quick-release ground wheel device of the universal wheel 21 is cylindrical and rotates with the pin sleeve 2. The pin shaft 9 of the quick-release ground wheel device of the fixed wheel 22 is inserted and fixedly engaged with the pin sleeve 2.

[0076] like Figure 1 As shown, in this example, two outer sleeves 1 are installed on the bottom crossbeam 26 of the front frame 23, and the pin 9 and the pin sleeve 2 are configured to be rotatably connected, thereby realizing the installation of two front universal wheels 21 on the bottom crossbeam 26. The lower sections of the two side rods 25 of the rear frame 24 are each used as an outer sleeve 1, and the pin 9 and the pin sleeve 2 are configured to be fixedly connected in a non-rotatable manner, thereby realizing the installation of two rear fixed wheels 22 on the lower sections of the two side rods 25 of the rear frame 24.

[0077] The lower end of the pin 9 is vertically fixed in the middle of the cross shoulder of the wheel fork 11, which provides better mechanical support performance.

[0078] A folding bicycle is also proposed, comprising six ground wheels 10, arranged in three configurations: two front swivel wheels 21, a middle fixed wheel 22, and two rear fixed wheels; or two rear swivel wheels 21, a middle fixed wheel 22, and two front fixed wheels 22; or two front swivel wheels 21, a middle fixed wheel 22, and two rear swivel wheels 21. The middle fixed wheel 22 can be quickly removed / installed by setting the first component on the bottom crossbeam 33 in the middle of the folding bicycle frame. The middle fixed wheel 22 can be configured as follows:Figure 20 The rear two directional wheels 22 are shown, the wheel diameter is adaptively reduced according to the needs, Figure 20 The middle directional wheel 22 is not installed, and the first assembly is arranged on the lower side of the middle bottom cross beam 33.

[0079] In understanding the utility model, if necessary, the above structure can refer to other embodiments / appendix Figure 1 And it is understood that here is not redundant.

[0080] The above is only an optional specific embodiment of the utility model, and equivalent changes or modifications made according to the structure, features and principles described in the utility model patent application range are included in the utility model patent application range.

Claims

1. A simple quick release device for ground engaging wheels, characterized in that, The utility model relates to a quick -mounting wheel structure, including, The sleeve (2) is made of plastic, the sleeve (1) is axially sleeved with the sleeve (2), the sleeve (2) is axially provided with a through hole (3), the both ends of the through hole (3) are respectively insertion end and outlet end from bottom to top, the moving part (4) is laterally provided with a sleeve hole (5) in the eccentric position relative to the through hole (3), the moving part (4) is integrally formed with the sleeve (2) and is connected through the elastic part (6), the sleeve (1) is provided with a window (7), the pressing part (8) of the moving part (4) protrudes outward of the window (7) in the initial state to expose the pressing part (8), when the pressing part (8) is pressed / released, the sleeve hole (5) is switched in the concentric / eccentric position with the through hole (3), and the elastic part (6) accumulates or releases elastic force, to unlock / limit the pin shaft (9); The pin shaft (9) is arranged at the top of the axle (11) of the ground wheel (10), the through hole (3) is detachably sleeved with the pin shaft (9), the top of the pin shaft (9) is provided with an insertion head (12), the lower side of the insertion head (12) is provided with a limiting groove (13), the pin shaft (9) is inserted into the through hole (3) from the insertion end, the insertion head (12) is stretched out from the outlet end and is further inserted into the sleeve hole (5), a matching surface (14) is arranged between the insertion head (12) and the sleeve hole (5), the matching surface (14) is arranged on the insertion head (12), when the insertion head (12) is inserted into the sleeve hole (5), the matching surface (14) drives the moving part (4) to move laterally, the elastic part (6) accumulates elastic force, when the limiting groove (13) reaches the sleeve hole (5) completely, the matching surface (14) is separated from the sleeve hole (5) to make the moving part (4) move back under the action of the elastic part (6), the side wall part (15) of the sleeve hole (5) is clamped into the limiting groove (13) to limit the pin shaft (9) in the axial direction, and the ground wheel (10) is quickly mounted;When the sleeve hole (5) is in the unlocking position, the side wall part (15) is out of the limiting groove (13), the insertion head (12) can be pulled out or dropped out reversely from the sleeve hole (5) to make the pin shaft (9) separate from the sleeve (2) to quickly dismount the ground wheel (10). The plastic elastic parts (6) are arranged on the left and right sides or the front and back sides of the moving part (4) along the moving direction.

2. The ground wheel quick release device according to claim 1, wherein, The sleeve (2) is made of high-elasticity and high-hardness engineering plastic.

3. The ground wheel quick release device according to claim 1 or 2, characterized in that, The plastic elastic parts (6) are arranged on the left and right sides of the moving part (4) and form support parts in the direction of the pressing part (8), or the plastic elastic parts (6) are arranged on the front and back sides of the moving part (4) and form support parts in the direction of the pressing part (8).

4. The ground wheel quick release device according to claim 2, wherein, The part of the pin shaft (9) in the limiting groove (13) is a cylindrical rod (16), the sleeve hole (5) is provided with an arc concave surface (17) matched with the cylindrical rod (16), when the sleeve hole (5) is in the limiting position, the arc concave surface (17) is matched with the cylindrical rod (16) in the lateral direction.

5. The ground wheel quick release device according to claim 1, wherein, ​ 6. The ground wheel quick release device according to claim 1, wherein, The lateral circumferential dimension of the pin sleeve (2) and the moving part (4) is less than the lateral inner circumferential dimension of the outer sleeve (1); the cross section of the pin sleeve (2) and the outer sleeve (1) is circular or polygonal or D-shaped or elliptical or flat elliptical tubular body.

7. The ground wheel quick release device according to claim 1 or 6, wherein, When the outer sleeve (1) axially sleeves the pin sleeve (2), the pin sleeve (2) is inserted into the outer sleeve (1) from the lower end of the outer sleeve (1), and in the process of insertion, the inner side wall of the outer sleeve (1) pushes the pressing part (8) back to make the pin sleeve (2) insertable into the outer sleeve (1), when the pressing part (8) reaches the window (7), the pressing part (8) extends out of the window (7) under the action of the elastic part (6).

8. The ground wheel quick release device of claim 1, wherein, The stroke of the pressing part (8) is set as: when the sleeving hole (5) is in the unlocking position, the pressing part (8) still cooperates with the window (7) to axially limit the pin sleeve (2).

9. The ground wheel quick release device according to claim 1 or 8, wherein, The outer sleeve (1) is provided with a limiting hole (18) on the circumference, and the outer circumference of the pin sleeve (2) is provided with a limiting boss (19) at the position corresponding to the limiting hole (18), the limiting boss (19) and the limiting hole (18) are in blocking and limiting cooperation; and / or the outer sleeve (1) is provided with an inwardly inclined elastic limiting part (31) on the circumference, and the outer circumference of the pin sleeve (2) is provided with a cooperating groove or hole (32) at the position corresponding to the elastic limiting part (31), the elastic limiting part (31) and the cooperating groove or hole (32) are in blocking and limiting cooperation; and / or further comprising a screw (28), the outer circumference of the pin sleeve (2) is provided with a connecting hole (29) at the position corresponding to the limiting hole (18), and the screw (28) is connected through the limiting hole (18) and the connecting hole (29) to fix the outer sleeve (1) and the pin sleeve (2).

10. The ground wheel quick release device according to claim 9, wherein, The lower end of the pin sleeve (2) is provided with a circumferential protrusion (30), when the limiting boss (19) and the limiting hole (18) are in blocking and limiting cooperation, the circumferential protrusion (30) is attached to the lower end surface of the outer sleeve (1) for axial limiting, or when the elastic limiting part (31) and the cooperating groove or hole (32) are in blocking and limiting cooperation, the circumferential protrusion (30) is attached to the lower end surface of the outer sleeve (1) for axial limiting, or when the screw (28) is connected through the limiting hole (18) and the connecting hole (29) to fix the outer sleeve (1) and the pin sleeve (2), the circumferential protrusion (30) is attached to the lower end surface of the outer sleeve (1) for axial limiting.

11. The ground wheel quick release device according to claim 1, wherein, The insertion head (12) is set as a conical or circular truncated cone or cylindrical head, the side surface of the conical or the side surface of the circular truncated cone is the cooperating surface (14), for the case of the cylindrical head, the sleeving hole (5) is correspondingly provided with an inclined surface (20), and the cylindrical head is driven to move the moving part (4) through the inclined surface (20).

12. The ground wheel quick release device according to claim 11, wherein, The inner side wall of the sleeving hole (5) is inclined (20) at least more than half from the lower end of the sleeving hole (5) upwards, and the inclined surface (20) is reversely arranged relative to the pressing part (8) of the moving part (4).

13. The ground wheel quick release device according to claim 1, wherein, The pin shaft (9) and the pin sleeve (2) are in rotatable or non-rotatable fixed cooperation.

14. The ground wheel quick release device according to claim 13, wherein, The rotatable fitting relationship is a sleeve fitting relationship with a circular cross section, and the non-rotatable fixed fitting relationship is a sleeve fitting relationship with a polygonal, D-shaped, oval or flat oval cross section or one or more key groove limiting fitting relationships.

15. The simple quick release device for ground wheel according to claim 1 or 13, characterized in that, The lower end of the pin shaft (9) is vertically fixedly arranged at the middle part of the cross shoulder of the fork (11).

16. A folding vehicle comprising four or six ground wheels (10), characterized in that, The ground wheel (10) and the frame of the folding bicycle are provided with the ground wheel simple quick release device according to any one of claims 1 to 15, when four ground wheels (10) are arranged, the arrangement mode is front two universal wheels (21), rear two directional wheels (22), or rear two universal wheels (21), front two directional wheels (22), or front two universal wheels (21), rear two universal wheels (21), and the three arrangement modes; when six ground wheels (10) are arranged, the arrangement mode is front two universal wheels (21), middle directional wheels (22), rear two directional wheels, or rear two universal wheels (21), middle directional wheels (22), front two directional wheels (22), or front two universal wheels (21), middle directional wheels (22), rear two universal wheels (21), and the three arrangement modes; the corresponding shaft pin of the ground wheel simple quick release device of the universal wheel (21) is a cylinder, which is in rotating cooperation with the pin sleeve (2), and the corresponding pin shaft (9) of the ground wheel simple quick release device of the directional wheel (22) is in fixed cooperation with the pin sleeve (2).

17. The foldable vehicle of claim 16, wherein, The lower segment of the side rod (25) of the front frame (23) and / or the middle bottom cross beam (33) and / or the rear frame (24) of the folding bicycle is the outer sleeve tube (1).

18. The foldable vehicle of claim 16 or 17, wherein, The bottom cross beam (26) of the front frame (23) and / or the bottom cross beam (26) of the rear frame (24) is provided with the outer sleeve tube (1).

Images